Release coccinelle-0.1

[bpt/coccinelle.git] / demos / demo_rule9 / sym53c8xx.c

/******************************************************************************
**  High Performance device driver for the Symbios 53C896 controller.
**
**  Copyright (C) 1998-2001  Gerard Roudier <groudier@free.fr>
**
**  This driver also supports all the Symbios 53C8XX controller family, 
**  except 53C810 revisions < 16, 53C825 revisions < 16 and all 
**  revisions of 53C815 controllers.
**
**  This driver is based on the Linux port of the FreeBSD ncr driver.
** 
**  Copyright (C) 1994  Wolfgang Stanglmeier
**  
**-----------------------------------------------------------------------------
**  
**  This program is free software; you can redistribute it and/or modify
**  it under the terms of the GNU General Public License as published by
**  the Free Software Foundation; either version 2 of the License, or
**  (at your option) any later version.
**
**  This program is distributed in the hope that it will be useful,
**  but WITHOUT ANY WARRANTY; without even the implied warranty of
**  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
**  GNU General Public License for more details.
**
**  You should have received a copy of the GNU General Public License
**  along with this program; if not, write to the Free Software
**  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
**
**-----------------------------------------------------------------------------
**
**  The Linux port of the FreeBSD ncr driver has been achieved in 
**  november 1995 by:
**
**          Gerard Roudier              <groudier@free.fr>
**
**  Being given that this driver originates from the FreeBSD version, and
**  in order to keep synergy on both, any suggested enhancements and corrections
**  received on Linux are automatically a potential candidate for the FreeBSD 
**  version.
**
**  The original driver has been written for 386bsd and FreeBSD by
**          Wolfgang Stanglmeier        <wolf@cologne.de>
**          Stefan Esser                <se@mi.Uni-Koeln.de>
**
**-----------------------------------------------------------------------------
**
**  Major contributions:
**  --------------------
**
**  NVRAM detection and reading.
**    Copyright (C) 1997 Richard Waltham <dormouse@farsrobt.demon.co.uk>
**
*******************************************************************************
*/

/*
**      Supported SCSI features:
**          Synchronous data transfers
**          Wide16 SCSI BUS
**          Disconnection/Reselection
**          Tagged command queuing
**          SCSI Parity checking
**
**      Supported NCR/SYMBIOS chips:
**              53C810A   (8 bits, Fast 10,      no rom BIOS) 
**              53C825A   (Wide,   Fast 10,      on-board rom BIOS)
**              53C860    (8 bits, Fast 20,      no rom BIOS)
**              53C875    (Wide,   Fast 20,      on-board rom BIOS)
**              53C876    (Wide,   Fast 20 Dual, on-board rom BIOS)
**              53C895    (Wide,   Fast 40,      on-board rom BIOS)
**              53C895A   (Wide,   Fast 40,      on-board rom BIOS)
**              53C896    (Wide,   Fast 40 Dual, on-board rom BIOS)
**              53C897    (Wide,   Fast 40 Dual, on-board rom BIOS)
**              53C1510D  (Wide,   Fast 40 Dual, on-board rom BIOS)
**              53C1010   (Wide,   Fast 80 Dual, on-board rom BIOS)
**              53C1010_66(Wide,   Fast 80 Dual, on-board rom BIOS, 33/66MHz PCI)
**
**      Other features:
**              Memory mapped IO
**              Module
**              Shared IRQ
*/

/*
**      Name and version of the driver
*/
#define SCSI_NCR_DRIVER_NAME    "sym53c8xx-1.7.3c-20010512"

#define SCSI_NCR_DEBUG_FLAGS    (0)

#define NAME53C         "sym53c"
#define NAME53C8XX      "sym53c8xx"

/*==========================================================
**
**      Include files
**
**==========================================================
*/

#include <linux/version.h>

#include <linux/module.h>

#include <asm/dma.h>
#include <asm/io.h>
#include <asm/system.h>
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,3,17)
#include <linux/spinlock.h>
#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,1,93)
#include <asm/spinlock.h>
#endif
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/signal.h>
#include <linux/errno.h>
#include <linux/pci.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/ioport.h>
#include <linux/time.h>
#include <linux/timer.h>
#include <linux/stat.h>

#include <linux/blk.h>

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,1,35)
#include <linux/init.h>
#endif

#ifndef __init
#define __init
#endif
#ifndef __initdata
#define __initdata
#endif

#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,1,92)
#include <linux/bios32.h>
#endif

#include "scsi.h"
#include "hosts.h"

#include <linux/types.h>

/*
**      Define BITS_PER_LONG for earlier linux versions.
*/
#ifndef BITS_PER_LONG
#if (~0UL) == 0xffffffffUL
#define BITS_PER_LONG   32
#else
#define BITS_PER_LONG   64
#endif
#endif

/*
**      Define the BSD style u_int32 and u_int64 type.
**      Are in fact u_int32_t and u_int64_t :-)
*/
typedef u32 u_int32;
typedef u64 u_int64;

#include "sym53c8xx.h"

/*
**      Donnot compile integrity checking code for Linux-2.3.0 
**      and above since SCSI data structures are not ready yet.
*/
/* #if LINUX_VERSION_CODE < KERNEL_VERSION(2,3,0) */
#if 0
#define SCSI_NCR_INTEGRITY_CHECKING
#endif

#define MIN(a,b)        (((a) < (b)) ? (a) : (b))
#define MAX(a,b)        (((a) > (b)) ? (a) : (b))

/*
**      Hmmm... What complex some PCI-HOST bridges actually are, 
**      despite the fact that the PCI specifications are looking 
**      so smart and simple! ;-)
*/
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,3,47)
#define SCSI_NCR_DYNAMIC_DMA_MAPPING
#endif

/*==========================================================
**
**      A la VMS/CAM-3 queue management.
**      Implemented from linux list management.
**
**==========================================================
*/

typedef struct xpt_quehead {
        struct xpt_quehead *flink;      /* Forward  pointer */
        struct xpt_quehead *blink;      /* Backward pointer */
} XPT_QUEHEAD;

#define xpt_que_init(ptr) do { \
        (ptr)->flink = (ptr); (ptr)->blink = (ptr); \
} while (0)

static inline void __xpt_que_add(struct xpt_quehead * new,
        struct xpt_quehead * blink,
        struct xpt_quehead * flink)
{
        flink->blink    = new;
        new->flink      = flink;
        new->blink      = blink;
        blink->flink    = new;
}

static inline void __xpt_que_del(struct xpt_quehead * blink,
        struct xpt_quehead * flink)
{
        flink->blink = blink;
        blink->flink = flink;
}

static inline int xpt_que_empty(struct xpt_quehead *head)
{
        return head->flink == head;
}

static inline void xpt_que_splice(struct xpt_quehead *list,
        struct xpt_quehead *head)
{
        struct xpt_quehead *first = list->flink;

        if (first != list) {
                struct xpt_quehead *last = list->blink;
                struct xpt_quehead *at   = head->flink;

                first->blink = head;
                head->flink  = first;

                last->flink = at;
                at->blink   = last;
        }
}

#define xpt_que_entry(ptr, type, member) \
        ((type *)((char *)(ptr)-(unsigned long)(&((type *)0)->member)))


#define xpt_insque(new, pos)            __xpt_que_add(new, pos, (pos)->flink)

#define xpt_remque(el)                  __xpt_que_del((el)->blink, (el)->flink)

#define xpt_insque_head(new, head)      __xpt_que_add(new, head, (head)->flink)

static inline struct xpt_quehead *xpt_remque_head(struct xpt_quehead *head)
{
        struct xpt_quehead *elem = head->flink;

        if (elem != head)
                __xpt_que_del(head, elem->flink);
        else
                elem = 0;
        return elem;
}

#define xpt_insque_tail(new, head)      __xpt_que_add(new, (head)->blink, head)

static inline struct xpt_quehead *xpt_remque_tail(struct xpt_quehead *head)
{
        struct xpt_quehead *elem = head->blink;

        if (elem != head)
                __xpt_que_del(elem->blink, head);
        else
                elem = 0;
        return elem;
}

/*==========================================================
**
**      Configuration and Debugging
**
**==========================================================
*/

/*
**    SCSI address of this device.
**    The boot routines should have set it.
**    If not, use this.
*/

#ifndef SCSI_NCR_MYADDR
#define SCSI_NCR_MYADDR      (7)
#endif

/*
**    The maximum number of tags per logic unit.
**    Used only for devices that support tags.
*/

#ifndef SCSI_NCR_MAX_TAGS
#define SCSI_NCR_MAX_TAGS    (8)
#endif

/*
**    TAGS are actually unlimited (256 tags/lun).
**    But Linux only supports 255. :)
*/
#if     SCSI_NCR_MAX_TAGS > 255
#define MAX_TAGS        255
#else
#define MAX_TAGS SCSI_NCR_MAX_TAGS
#endif

/*
**    Since the ncr chips only have a 8 bit ALU, we try to be clever 
**    about offset calculation in the TASK TABLE per LUN that is an 
**    array of DWORDS = 4 bytes.
*/
#if     MAX_TAGS > (512/4)
#define MAX_TASKS  (1024/4)
#elif   MAX_TAGS > (256/4) 
#define MAX_TASKS  (512/4)
#else
#define MAX_TASKS  (256/4)
#endif

/*
**    This one means 'NO TAG for this job'
*/
#define NO_TAG  (256)

/*
**    Number of targets supported by the driver.
**    n permits target numbers 0..n-1.
**    Default is 16, meaning targets #0..#15.
**    #7 .. is myself.
*/

#ifdef SCSI_NCR_MAX_TARGET
#define MAX_TARGET  (SCSI_NCR_MAX_TARGET)
#else
#define MAX_TARGET  (16)
#endif

/*
**    Number of logic units supported by the driver.
**    n enables logic unit numbers 0..n-1.
**    The common SCSI devices require only
**    one lun, so take 1 as the default.
*/

#ifdef SCSI_NCR_MAX_LUN
#define MAX_LUN    64
#else
#define MAX_LUN    (1)
#endif

/*
**    Asynchronous pre-scaler (ns). Shall be 40 for 
**    the SCSI timings to be compliant.
*/
 
#ifndef SCSI_NCR_MIN_ASYNC
#define SCSI_NCR_MIN_ASYNC (40)
#endif

/*
**    The maximum number of jobs scheduled for starting.
**    We allocate 4 entries more than the value we announce 
**    to the SCSI upper layer. Guess why ! :-)
*/

#ifdef SCSI_NCR_CAN_QUEUE
#define MAX_START   (SCSI_NCR_CAN_QUEUE + 4)
#else
#define MAX_START   (MAX_TARGET + 7 * MAX_TAGS)
#endif

/*
**    We donnot want to allocate more than 1 PAGE for the 
**    the start queue and the done queue. We hard-code entry 
**    size to 8 in order to let cpp do the checking.
**    Allows 512-4=508 pending IOs for i386 but Linux seems for 
**    now not able to provide the driver with this amount of IOs.
*/
#if     MAX_START > PAGE_SIZE/8
#undef  MAX_START
#define MAX_START (PAGE_SIZE/8)
#endif

/*
**    The maximum number of segments a transfer is split into.
**    We support up to 127 segments for both read and write.
*/

#define MAX_SCATTER (SCSI_NCR_MAX_SCATTER)
#define SCR_SG_SIZE     (2)

/*
**      other
*/

#define NCR_SNOOP_TIMEOUT (1000000)

/*==========================================================
**
**      Miscallaneous BSDish defines.
**
**==========================================================
*/

#define u_char          unsigned char
#define u_short         unsigned short
#define u_int           unsigned int
#define u_long          unsigned long

#ifndef bcopy
#define bcopy(s, d, n)  memcpy((d), (s), (n))
#endif

#ifndef bzero
#define bzero(d, n)     memset((d), 0, (n))
#endif
 
#ifndef offsetof
#define offsetof(t, m)  ((size_t) (&((t *)0)->m))
#endif

/*
**      Simple Wrapper to kernel PCI bus interface.
**
**      This wrapper allows to get rid of old kernel PCI interface 
**      and still allows to preserve linux-2.0 compatibilty.
**      In fact, it is mostly an incomplete emulation of the new 
**      PCI code for pre-2.2 kernels. When kernel-2.0 support 
**      will be dropped, we will just have to remove most of this 
**      code.
*/

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,0)

typedef struct pci_dev *pcidev_t;
#define PCIDEV_NULL             (0)
#define PciBusNumber(d)         (d)->bus->number
#define PciDeviceFn(d)          (d)->devfn
#define PciVendorId(d)          (d)->vendor
#define PciDeviceId(d)          (d)->device
#define PciIrqLine(d)           (d)->irq

static u_long __init
pci_get_base_cookie(struct pci_dev *pdev, int index)
{
        u_long base;

#if LINUX_VERSION_CODE > KERNEL_VERSION(2,3,12)
        base = pdev->resource[index].start;
#else
        base = pdev->base_address[index];
#if BITS_PER_LONG > 32
        if ((base & 0x7) == 0x4)
                *base |= (((u_long)pdev->base_address[++index]) << 32);
#endif
#endif
        return (base & ~0x7ul);
}

static int __init
pci_get_base_address(struct pci_dev *pdev, int index, u_long *base)
{
        u32 tmp;
#define PCI_BAR_OFFSET(index) (PCI_BASE_ADDRESS_0 + (index<<2))

        pci_read_config_dword(pdev, PCI_BAR_OFFSET(index), &tmp);
        *base = tmp;
        ++index;
        if ((tmp & 0x7) == 0x4) {
#if BITS_PER_LONG > 32
                pci_read_config_dword(pdev, PCI_BAR_OFFSET(index), &tmp);
                *base |= (((u_long)tmp) << 32);
#endif
                ++index;
        }
        return index;
#undef PCI_BAR_OFFSET
}

#else   /* Incomplete emulation of current PCI code for pre-2.2 kernels */

typedef unsigned int pcidev_t;
#define PCIDEV_NULL             (~0u)
#define PciBusNumber(d)         ((d)>>8)
#define PciDeviceFn(d)          ((d)&0xff)
#define __PciDev(busn, devfn)   (((busn)<<8)+(devfn))

#define pci_present pcibios_present

#define pci_read_config_byte(d, w, v) \
        pcibios_read_config_byte(PciBusNumber(d), PciDeviceFn(d), w, v)
#define pci_read_config_word(d, w, v) \
        pcibios_read_config_word(PciBusNumber(d), PciDeviceFn(d), w, v)
#define pci_read_config_dword(d, w, v) \
        pcibios_read_config_dword(PciBusNumber(d), PciDeviceFn(d), w, v)

#define pci_write_config_byte(d, w, v) \
        pcibios_write_config_byte(PciBusNumber(d), PciDeviceFn(d), w, v)
#define pci_write_config_word(d, w, v) \
        pcibios_write_config_word(PciBusNumber(d), PciDeviceFn(d), w, v)
#define pci_write_config_dword(d, w, v) \
        pcibios_write_config_dword(PciBusNumber(d), PciDeviceFn(d), w, v)

static pcidev_t __init
pci_find_device(unsigned int vendor, unsigned int device, pcidev_t prev)
{
        static unsigned short pci_index;
        int retv;
        unsigned char bus_number, device_fn;

        if (prev == PCIDEV_NULL)
                pci_index = 0;
        else
                ++pci_index;
        retv = pcibios_find_device (vendor, device, pci_index,
                                    &bus_number, &device_fn);
        return retv ? PCIDEV_NULL : __PciDev(bus_number, device_fn);
}

static u_short __init PciVendorId(pcidev_t dev)
{
        u_short vendor_id;
        pci_read_config_word(dev, PCI_VENDOR_ID, &vendor_id);
        return vendor_id;
}

static u_short __init PciDeviceId(pcidev_t dev)
{
        u_short device_id;
        pci_read_config_word(dev, PCI_DEVICE_ID, &device_id);
        return device_id;
}

static u_int __init PciIrqLine(pcidev_t dev)
{
        u_char irq;
        pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq);
        return irq;
}

static int __init 
pci_get_base_address(pcidev_t dev, int offset, u_long *base)
{
        u_int32 tmp;
        
        pci_read_config_dword(dev, PCI_BASE_ADDRESS_0 + offset, &tmp);
        *base = tmp;
        offset += sizeof(u_int32);
        if ((tmp & 0x7) == 0x4) {
#if BITS_PER_LONG > 32
                pci_read_config_dword(dev, PCI_BASE_ADDRESS_0 + offset, &tmp);
                *base |= (((u_long)tmp) << 32);
#endif
                offset += sizeof(u_int32);
        }
        return offset;
}
static u_long __init
pci_get_base_cookie(struct pci_dev *pdev, int offset)
{
        u_long base;

        (void) pci_get_base_address(dev, offset, &base);

        return base;
}

#endif  /* LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,0) */

/* Does not make sense in earlier kernels */
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,4,0)
#define pci_enable_device(pdev)         (0)
#endif
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,4,4)
#define scsi_set_pci_device(inst, pdev) (0)
#endif

/*==========================================================
**
**      Debugging tags
**
**==========================================================
*/

#define DEBUG_ALLOC    (0x0001)
#define DEBUG_PHASE    (0x0002)
#define DEBUG_QUEUE    (0x0008)
#define DEBUG_RESULT   (0x0010)
#define DEBUG_POINTER  (0x0020)
#define DEBUG_SCRIPT   (0x0040)
#define DEBUG_TINY     (0x0080)
#define DEBUG_TIMING   (0x0100)
#define DEBUG_NEGO     (0x0200)
#define DEBUG_TAGS     (0x0400)
#define DEBUG_IC       (0x0800)

/*
**    Enable/Disable debug messages.
**    Can be changed at runtime too.
*/

#ifdef SCSI_NCR_DEBUG_INFO_SUPPORT
static int ncr_debug = SCSI_NCR_DEBUG_FLAGS;
        #define DEBUG_FLAGS ncr_debug
#else
        #define DEBUG_FLAGS     SCSI_NCR_DEBUG_FLAGS
#endif

/*
**      SMP threading.
**
**      Assuming that SMP systems are generally high end systems and may 
**      use several SCSI adapters, we are using one lock per controller 
**      instead of some global one. For the moment (linux-2.1.95), driver's 
**      entry points are called with the 'io_request_lock' lock held, so:
**      - We are uselessly loosing a couple of micro-seconds to lock the 
**        controller data structure.
**      - But the driver is not broken by design for SMP and so can be 
**        more resistant to bugs or bad changes in the IO sub-system code.
**      - A small advantage could be that the interrupt code is grained as 
**        wished (e.g.: threaded by controller).
*/

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,1,93)

spinlock_t sym53c8xx_lock = SPIN_LOCK_UNLOCKED;
#define NCR_LOCK_DRIVER(flags)     spin_lock_irqsave(&sym53c8xx_lock, flags)
#define NCR_UNLOCK_DRIVER(flags)   spin_unlock_irqrestore(&sym53c8xx_lock,flags)

#define NCR_INIT_LOCK_NCB(np)      spin_lock_init(&np->smp_lock);
#define NCR_LOCK_NCB(np, flags)    spin_lock_irqsave(&np->smp_lock, flags)
#define NCR_UNLOCK_NCB(np, flags)  spin_unlock_irqrestore(&np->smp_lock, flags)

#define NCR_LOCK_SCSI_DONE(host, flags) \
                spin_lock_irqsave(((host)->host_lock), flags)
#define NCR_UNLOCK_SCSI_DONE(host, flags) \
                spin_unlock_irqrestore(((host)->host_lock), flags)

#else

#define NCR_LOCK_DRIVER(flags)     do { save_flags(flags); cli(); } while (0)
#define NCR_UNLOCK_DRIVER(flags)   do { restore_flags(flags); } while (0)

#define NCR_INIT_LOCK_NCB(np)      do { } while (0)
#define NCR_LOCK_NCB(np, flags)    do { save_flags(flags); cli(); } while (0)
#define NCR_UNLOCK_NCB(np, flags)  do { restore_flags(flags); } while (0)

#define NCR_LOCK_SCSI_DONE(host, flags)    do {;} while (0)
#define NCR_UNLOCK_SCSI_DONE(host, flags)  do {;} while (0)

#endif

/*
**      Memory mapped IO
**
**      Since linux-2.1, we must use ioremap() to map the io memory space.
**      iounmap() to unmap it. That allows portability.
**      Linux 1.3.X and 2.0.X allow to remap physical pages addresses greater 
**      than the highest physical memory address to kernel virtual pages with 
**      vremap() / vfree(). That was not portable but worked with i386 
**      architecture.
*/

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,1,0)
#define ioremap vremap
#define iounmap vfree
#endif

#ifdef __sparc__
#  include <asm/irq.h>
#  define memcpy_to_pci(a, b, c)        memcpy_toio((a), (b), (c))
#elif defined(__alpha__)
#  define memcpy_to_pci(a, b, c)        memcpy_toio((a), (b), (c))
#else   /* others */
#  define memcpy_to_pci(a, b, c)        memcpy_toio((a), (b), (c))
#endif

#ifndef SCSI_NCR_PCI_MEM_NOT_SUPPORTED
static u_long __init remap_pci_mem(u_long base, u_long size)
{
        u_long page_base        = ((u_long) base) & PAGE_MASK;
        u_long page_offs        = ((u_long) base) - page_base;
        u_long page_remapped    = (u_long) ioremap(page_base, page_offs+size);

        return page_remapped? (page_remapped + page_offs) : 0UL;
}

static void __init unmap_pci_mem(u_long vaddr, u_long size)
{
        if (vaddr)
                iounmap((void *) (vaddr & PAGE_MASK));
}

#endif /* not def SCSI_NCR_PCI_MEM_NOT_SUPPORTED */

/*
**      Insert a delay in micro-seconds and milli-seconds.
**      -------------------------------------------------
**      Under Linux, udelay() is restricted to delay < 1 milli-second.
**      In fact, it generally works for up to 1 second delay.
**      Since 2.1.105, the mdelay() function is provided for delays 
**      in milli-seconds.
**      Under 2.0 kernels, udelay() is an inline function that is very 
**      inaccurate on Pentium processors.
*/

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,1,105)
#define UDELAY udelay
#define MDELAY mdelay
#else
static void UDELAY(long us) { udelay(us); }
static void MDELAY(long ms) { while (ms--) UDELAY(1000); }
#endif

/*
**      Simple power of two buddy-like allocator
**      ----------------------------------------
**      This simple code is not intended to be fast, but to provide 
**      power of 2 aligned memory allocations.
**      Since the SCRIPTS processor only supplies 8 bit arithmetic,
**      this allocator allows simple and fast address calculations  
**      from the SCRIPTS code. In addition, cache line alignment 
**      is guaranteed for power of 2 cache line size.
**      Enhanced in linux-2.3.44 to provide a memory pool per pcidev 
**      to support dynamic dma mapping. (I would have preferred a 
**      real bus astraction, btw).
*/

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,1,0)
#define __GetFreePages(flags, order) __get_free_pages(flags, order)
#else
#define __GetFreePages(flags, order) __get_free_pages(flags, order, 0)
#endif

#define MEMO_SHIFT      4       /* 16 bytes minimum memory chunk */
#if PAGE_SIZE >= 8192
#define MEMO_PAGE_ORDER 0       /* 1 PAGE  maximum */
#else
#define MEMO_PAGE_ORDER 1       /* 2 PAGES maximum */
#endif
#define MEMO_FREE_UNUSED        /* Free unused pages immediately */
#define MEMO_WARN       1
#define MEMO_GFP_FLAGS  GFP_ATOMIC
#define MEMO_CLUSTER_SHIFT      (PAGE_SHIFT+MEMO_PAGE_ORDER)
#define MEMO_CLUSTER_SIZE       (1UL << MEMO_CLUSTER_SHIFT)
#define MEMO_CLUSTER_MASK       (MEMO_CLUSTER_SIZE-1)

typedef u_long m_addr_t;        /* Enough bits to bit-hack addresses */
typedef pcidev_t m_bush_t;      /* Something that addresses DMAable */

typedef struct m_link {         /* Link between free memory chunks */
        struct m_link *next;
} m_link_s;

#ifdef  SCSI_NCR_DYNAMIC_DMA_MAPPING
typedef struct m_vtob {         /* Virtual to Bus address translation */
        struct m_vtob *next;
        m_addr_t vaddr;
        m_addr_t baddr;
} m_vtob_s;
#define VTOB_HASH_SHIFT         5
#define VTOB_HASH_SIZE          (1UL << VTOB_HASH_SHIFT)
#define VTOB_HASH_MASK          (VTOB_HASH_SIZE-1)
#define VTOB_HASH_CODE(m)       \
        ((((m_addr_t) (m)) >> MEMO_CLUSTER_SHIFT) & VTOB_HASH_MASK)
#endif

typedef struct m_pool {         /* Memory pool of a given kind */
#ifdef  SCSI_NCR_DYNAMIC_DMA_MAPPING
        m_bush_t bush;
        m_addr_t (*getp)(struct m_pool *);
        void (*freep)(struct m_pool *, m_addr_t);
#define M_GETP()                mp->getp(mp)
#define M_FREEP(p)              mp->freep(mp, p)
#define GetPages()              __GetFreePages(MEMO_GFP_FLAGS, MEMO_PAGE_ORDER)
#define FreePages(p)            free_pages(p, MEMO_PAGE_ORDER)
        int nump;
        m_vtob_s *(vtob[VTOB_HASH_SIZE]);
        struct m_pool *next;
#else
#define M_GETP()                __GetFreePages(MEMO_GFP_FLAGS, MEMO_PAGE_ORDER)
#define M_FREEP(p)              free_pages(p, MEMO_PAGE_ORDER)
#endif  /* SCSI_NCR_DYNAMIC_DMA_MAPPING */
        struct m_link h[PAGE_SHIFT-MEMO_SHIFT+MEMO_PAGE_ORDER+1];
} m_pool_s;

static void *___m_alloc(m_pool_s *mp, int size)
{
        int i = 0;
        int s = (1 << MEMO_SHIFT);
        int j;
        m_addr_t a;
        m_link_s *h = mp->h;

        if (size > (PAGE_SIZE << MEMO_PAGE_ORDER))
                return 0;

        while (size > s) {
                s <<= 1;
                ++i;
        }

        j = i;
        while (!h[j].next) {
                if (s == (PAGE_SIZE << MEMO_PAGE_ORDER)) {
                        h[j].next = (m_link_s *) M_GETP();
                        if (h[j].next)
                                h[j].next->next = 0;
                        break;
                }
                ++j;
                s <<= 1;
        }
        a = (m_addr_t) h[j].next;
        if (a) {
                h[j].next = h[j].next->next;
                while (j > i) {
                        j -= 1;
                        s >>= 1;
                        h[j].next = (m_link_s *) (a+s);
                        h[j].next->next = 0;
                }
        }
#ifdef DEBUG
        printk("___m_alloc(%d) = %p\n", size, (void *) a);
#endif
        return (void *) a;
}

static void ___m_free(m_pool_s *mp, void *ptr, int size)
{
        int i = 0;
        int s = (1 << MEMO_SHIFT);
        m_link_s *q;
        m_addr_t a, b;
        m_link_s *h = mp->h;

#ifdef DEBUG
        printk("___m_free(%p, %d)\n", ptr, size);
#endif

        if (size > (PAGE_SIZE << MEMO_PAGE_ORDER))
                return;

        while (size > s) {
                s <<= 1;
                ++i;
        }

        a = (m_addr_t) ptr;

        while (1) {
#ifdef MEMO_FREE_UNUSED
                if (s == (PAGE_SIZE << MEMO_PAGE_ORDER)) {
                        M_FREEP(a);
                        break;
                }
#endif
                b = a ^ s;
                q = &h[i];
                while (q->next && q->next != (m_link_s *) b) {
                        q = q->next;
                }
                if (!q->next) {
                        ((m_link_s *) a)->next = h[i].next;
                        h[i].next = (m_link_s *) a;
                        break;
                }
                q->next = q->next->next;
                a = a & b;
                s <<= 1;
                ++i;
        }
}

static void *__m_calloc2(m_pool_s *mp, int size, char *name, int uflags)
{
        void *p;

        p = ___m_alloc(mp, size);

        if (DEBUG_FLAGS & DEBUG_ALLOC)
                printk ("new %-10s[%4d] @%p.\n", name, size, p);

        if (p)
                bzero(p, size);
        else if (uflags & MEMO_WARN)
                printk (NAME53C8XX ": failed to allocate %s[%d]\n", name, size);

        return p;
}

#define __m_calloc(mp, s, n)    __m_calloc2(mp, s, n, MEMO_WARN)

static void __m_free(m_pool_s *mp, void *ptr, int size, char *name)
{
        if (DEBUG_FLAGS & DEBUG_ALLOC)
                printk ("freeing %-10s[%4d] @%p.\n", name, size, ptr);

        ___m_free(mp, ptr, size);

}

/*
 * With pci bus iommu support, we use a default pool of unmapped memory 
 * for memory we donnot need to DMA from/to and one pool per pcidev for 
 * memory accessed by the PCI chip. `mp0' is the default not DMAable pool.
 */

#ifndef SCSI_NCR_DYNAMIC_DMA_MAPPING

static m_pool_s mp0;

#else

static m_addr_t ___mp0_getp(m_pool_s *mp)
{
        m_addr_t m = GetPages();
        if (m)
                ++mp->nump;
        return m;
}

static void ___mp0_freep(m_pool_s *mp, m_addr_t m)
{
        FreePages(m);
        --mp->nump;
}

static m_pool_s mp0 = {0, ___mp0_getp, ___mp0_freep};

#endif  /* SCSI_NCR_DYNAMIC_DMA_MAPPING */

static void *m_calloc(int size, char *name)
{
        u_long flags;
        void *m;
        NCR_LOCK_DRIVER(flags);
        m = __m_calloc(&mp0, size, name);
        NCR_UNLOCK_DRIVER(flags);
        return m;
}

static void m_free(void *ptr, int size, char *name)
{
        u_long flags;
        NCR_LOCK_DRIVER(flags);
        __m_free(&mp0, ptr, size, name);
        NCR_UNLOCK_DRIVER(flags);
}

/*
 * DMAable pools.
 */

#ifndef SCSI_NCR_DYNAMIC_DMA_MAPPING

/* Without pci bus iommu support, all the memory is assumed DMAable */

#define __m_calloc_dma(b, s, n)         m_calloc(s, n)
#define __m_free_dma(b, p, s, n)        m_free(p, s, n)
#define __vtobus(b, p)                  virt_to_bus(p)

#else

/*
 * With pci bus iommu support, we maintain one pool per pcidev and a 
 * hashed reverse table for virtual to bus physical address translations.
 */
static m_addr_t ___dma_getp(m_pool_s *mp)
{
        m_addr_t vp;
        m_vtob_s *vbp;

        vbp = __m_calloc(&mp0, sizeof(*vbp), "VTOB");
        if (vbp) {
                dma_addr_t daddr;
                vp = (m_addr_t) pci_alloc_consistent(mp->bush,
                                                     PAGE_SIZE<<MEMO_PAGE_ORDER,
                                                     &daddr);
                if (vp) {
                        int hc = VTOB_HASH_CODE(vp);
                        vbp->vaddr = vp;
                        vbp->baddr = daddr;
                        vbp->next = mp->vtob[hc];
                        mp->vtob[hc] = vbp;
                        ++mp->nump;
                        return vp;
                }
                else
                        __m_free(&mp0, vbp, sizeof(*vbp), "VTOB");
        }
        return 0;
}

static void ___dma_freep(m_pool_s *mp, m_addr_t m)
{
        m_vtob_s **vbpp, *vbp;
        int hc = VTOB_HASH_CODE(m);

        vbpp = &mp->vtob[hc];
        while (*vbpp && (*vbpp)->vaddr != m)
                vbpp = &(*vbpp)->next;
        if (*vbpp) {
                vbp = *vbpp;
                *vbpp = (*vbpp)->next;
                pci_free_consistent(mp->bush, PAGE_SIZE<<MEMO_PAGE_ORDER,
                                    (void *)vbp->vaddr, (dma_addr_t)vbp->baddr);
                __m_free(&mp0, vbp, sizeof(*vbp), "VTOB");
                --mp->nump;
        }
}

static inline m_pool_s *___get_dma_pool(m_bush_t bush)
{
        m_pool_s *mp;
        for (mp = mp0.next; mp && mp->bush != bush; mp = mp->next);
        return mp;
}

static m_pool_s *___cre_dma_pool(m_bush_t bush)
{
        m_pool_s *mp;
        mp = __m_calloc(&mp0, sizeof(*mp), "MPOOL");
        if (mp) {
                bzero(mp, sizeof(*mp));
                mp->bush = bush;
                mp->getp = ___dma_getp;
                mp->freep = ___dma_freep;
                mp->next = mp0.next;
                mp0.next = mp;
        }
        return mp;
}

static void ___del_dma_pool(m_pool_s *p)
{
        struct m_pool **pp = &mp0.next;

        while (*pp && *pp != p)
                pp = &(*pp)->next;
        if (*pp) {
                *pp = (*pp)->next;
                __m_free(&mp0, p, sizeof(*p), "MPOOL");
        }
}

static void *__m_calloc_dma(m_bush_t bush, int size, char *name)
{
        u_long flags;
        struct m_pool *mp;
        void *m = 0;

        NCR_LOCK_DRIVER(flags);
        mp = ___get_dma_pool(bush);
        if (!mp)
                mp = ___cre_dma_pool(bush);
        if (mp)
                m = __m_calloc(mp, size, name);
        if (mp && !mp->nump)
                ___del_dma_pool(mp);
        NCR_UNLOCK_DRIVER(flags);

        return m;
}

static void __m_free_dma(m_bush_t bush, void *m, int size, char *name)
{
        u_long flags;
        struct m_pool *mp;

        NCR_LOCK_DRIVER(flags);
        mp = ___get_dma_pool(bush);
        if (mp)
                __m_free(mp, m, size, name);
        if (mp && !mp->nump)
                ___del_dma_pool(mp);
        NCR_UNLOCK_DRIVER(flags);
}

static m_addr_t __vtobus(m_bush_t bush, void *m)
{
        u_long flags;
        m_pool_s *mp;
        int hc = VTOB_HASH_CODE(m);
        m_vtob_s *vp = 0;
        m_addr_t a = ((m_addr_t) m) & ~MEMO_CLUSTER_MASK;

        NCR_LOCK_DRIVER(flags);
        mp = ___get_dma_pool(bush);
        if (mp) {
                vp = mp->vtob[hc];
                while (vp && (m_addr_t) vp->vaddr != a)
                        vp = vp->next;
        }
        NCR_UNLOCK_DRIVER(flags);
        return vp ? vp->baddr + (((m_addr_t) m) - a) : 0;
}

#endif  /* SCSI_NCR_DYNAMIC_DMA_MAPPING */

#define _m_calloc_dma(np, s, n)         __m_calloc_dma(np->pdev, s, n)
#define _m_free_dma(np, p, s, n)        __m_free_dma(np->pdev, p, s, n)
#define m_calloc_dma(s, n)              _m_calloc_dma(np, s, n)
#define m_free_dma(p, s, n)             _m_free_dma(np, p, s, n)
#define _vtobus(np, p)                  __vtobus(np->pdev, p)
#define vtobus(p)                       _vtobus(np, p)

/*
 *  Deal with DMA mapping/unmapping.
 */

#ifndef SCSI_NCR_DYNAMIC_DMA_MAPPING

/* Linux versions prior to pci bus iommu kernel interface */

#define __unmap_scsi_data(pdev, cmd)    do {; } while (0)
#define __map_scsi_single_data(pdev, cmd) (__vtobus(pdev,(cmd)->request_buffer))
#define __map_scsi_sg_data(pdev, cmd)   ((cmd)->use_sg)
#define __sync_scsi_data(pdev, cmd)     do {; } while (0)

#define scsi_sg_dma_address(sc)         vtobus((sc)->address)
#define scsi_sg_dma_len(sc)             ((sc)->length)

#else

/* Linux version with pci bus iommu kernel interface */

/* To keep track of the dma mapping (sg/single) that has been set */
#define __data_mapped(cmd)      (cmd)->SCp.phase
#define __data_mapping(cmd)     (cmd)->SCp.dma_handle

static void __unmap_scsi_data(pcidev_t pdev, Scsi_Cmnd *cmd)
{
        int dma_dir = scsi_to_pci_dma_dir(cmd->sc_data_direction);

        switch(__data_mapped(cmd)) {
        case 2:
                pci_unmap_sg(pdev, cmd->buffer, cmd->use_sg, dma_dir);
                break;
        case 1:
                pci_unmap_page(pdev, __data_mapping(cmd),
                               cmd->request_bufflen, dma_dir);
                break;
        }
        __data_mapped(cmd) = 0;
}

static dma_addr_t __map_scsi_single_data(pcidev_t pdev, Scsi_Cmnd *cmd)
{
        dma_addr_t mapping;
        int dma_dir = scsi_to_pci_dma_dir(cmd->sc_data_direction);

        if (cmd->request_bufflen == 0)
                return 0;

        mapping = pci_map_page(pdev,
                               virt_to_page(cmd->request_buffer),
                               ((unsigned long)cmd->request_buffer &
                                ~PAGE_MASK),
                               cmd->request_bufflen, dma_dir);
        __data_mapped(cmd) = 1;
        __data_mapping(cmd) = mapping;

        return mapping;
}

static int __map_scsi_sg_data(pcidev_t pdev, Scsi_Cmnd *cmd)
{
        int use_sg;
        int dma_dir = scsi_to_pci_dma_dir(cmd->sc_data_direction);

        if (cmd->use_sg == 0)
                return 0;

        use_sg = pci_map_sg(pdev, cmd->buffer, cmd->use_sg, dma_dir);
        __data_mapped(cmd) = 2;
        __data_mapping(cmd) = use_sg;

        return use_sg;
}

static void __sync_scsi_data(pcidev_t pdev, Scsi_Cmnd *cmd)
{
        int dma_dir = scsi_to_pci_dma_dir(cmd->sc_data_direction);

        switch(__data_mapped(cmd)) {
        case 2:
                pci_dma_sync_sg(pdev, cmd->buffer, cmd->use_sg, dma_dir);
                break;
        case 1:
                pci_dma_sync_single(pdev, __data_mapping(cmd),
                                    cmd->request_bufflen, dma_dir);
                break;
        }
}

#define scsi_sg_dma_address(sc)         sg_dma_address(sc)
#define scsi_sg_dma_len(sc)             sg_dma_len(sc)

#endif  /* SCSI_NCR_DYNAMIC_DMA_MAPPING */

#define unmap_scsi_data(np, cmd)        __unmap_scsi_data(np->pdev, cmd)
#define map_scsi_single_data(np, cmd)   __map_scsi_single_data(np->pdev, cmd)
#define map_scsi_sg_data(np, cmd)       __map_scsi_sg_data(np->pdev, cmd)
#define sync_scsi_data(np, cmd)         __sync_scsi_data(np->pdev, cmd)


/*
 * Print out some buffer.
 */
static void ncr_print_hex(u_char *p, int n)
{
        while (n-- > 0)
                printk (" %x", *p++);
}

static void ncr_printl_hex(char *label, u_char *p, int n)
{
        printk("%s", label);
        ncr_print_hex(p, n);
        printk (".\n");
}

/*
**      Transfer direction
**
**      Until some linux kernel version near 2.3.40, low-level scsi 
**      drivers were not told about data transfer direction.
**      We check the existence of this feature that has been expected 
**      for a _long_ time by all SCSI driver developers by just 
**      testing against the definition of SCSI_DATA_UNKNOWN. Indeed 
**      this is a hack, but testing against a kernel version would 
**      have been a shame. ;-)
*/
#ifdef  SCSI_DATA_UNKNOWN

#define scsi_data_direction(cmd)        (cmd->sc_data_direction)

#else

#define SCSI_DATA_UNKNOWN       0
#define SCSI_DATA_WRITE         1
#define SCSI_DATA_READ          2
#define SCSI_DATA_NONE          3

static __inline__ int scsi_data_direction(Scsi_Cmnd *cmd)
{
        int direction;

        switch((int) cmd->cmnd[0]) {
        case 0x08:  /*  READ(6)                         08 */
        case 0x28:  /*  READ(10)                        28 */
        case 0xA8:  /*  READ(12)                        A8 */
                direction = SCSI_DATA_READ;
                break;
        case 0x0A:  /*  WRITE(6)                        0A */
        case 0x2A:  /*  WRITE(10)                       2A */
        case 0xAA:  /*  WRITE(12)                       AA */
                direction = SCSI_DATA_WRITE;
                break;
        default:
                direction = SCSI_DATA_UNKNOWN;
                break;
        }

        return direction;
}

#endif  /* SCSI_DATA_UNKNOWN */


/*
**      /proc directory entry and proc_info function
*/
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,3,27)
static struct proc_dir_entry proc_scsi_sym53c8xx = {
    PROC_SCSI_SYM53C8XX, 9, NAME53C8XX,
    S_IFDIR | S_IRUGO | S_IXUGO, 2
};
#endif
#ifdef SCSI_NCR_PROC_INFO_SUPPORT
static int sym53c8xx_proc_info(char *buffer, char **start, off_t offset,
                        int length, int hostno, int func);
#endif

/*
**      Driver setup.
**
**      This structure is initialized from linux config options.
**      It can be overridden at boot-up by the boot command line.
*/
static struct ncr_driver_setup
        driver_setup                    = SCSI_NCR_DRIVER_SETUP;

#ifdef  SCSI_NCR_BOOT_COMMAND_LINE_SUPPORT
static struct ncr_driver_setup
        driver_safe_setup __initdata    = SCSI_NCR_DRIVER_SAFE_SETUP;
# ifdef MODULE
char *sym53c8xx = 0;    /* command line passed by insmod */
#  if LINUX_VERSION_CODE >= KERNEL_VERSION(2,1,30)
MODULE_PARM(sym53c8xx, "s");
#  endif
# endif
#endif

/*
**      Other Linux definitions
*/
#define SetScsiResult(cmd, h_sts, s_sts) \
        cmd->result = (((h_sts) << 16) + ((s_sts) & 0x7f))

/* We may have to remind our amnesiac SCSI layer of the reason of the abort */
#if 0
#define SetScsiAbortResult(cmd) \
          SetScsiResult(        \
            cmd,                \
            (cmd)->abort_reason == DID_TIME_OUT ? DID_TIME_OUT : DID_ABORT, \
            0xff)
#else
#define SetScsiAbortResult(cmd) SetScsiResult(cmd, DID_ABORT, 0xff)
#endif

static void sym53c8xx_intr(int irq, void *dev_id, struct pt_regs * regs);
static void sym53c8xx_timeout(unsigned long np);

#define initverbose (driver_setup.verbose)
#define bootverbose (np->verbose)

#ifdef SCSI_NCR_NVRAM_SUPPORT
static u_char Tekram_sync[16] __initdata =
        {25,31,37,43, 50,62,75,125, 12,15,18,21, 6,7,9,10};
#endif /* SCSI_NCR_NVRAM_SUPPORT */

/*
**      Structures used by sym53c8xx_detect/sym53c8xx_pci_init to 
**      transmit device configuration to the ncr_attach() function.
*/
typedef struct {
        int     bus;
        u_char  device_fn;
        u_long  base;
        u_long  base_2;
        u_long  io_port;
        u_long  base_c;
        u_long  base_2_c;
        int     irq;
/* port and reg fields to use INB, OUTB macros */
        u_long  base_io;
        volatile struct ncr_reg *reg;
} ncr_slot;

typedef struct {
        int type;
#define SCSI_NCR_SYMBIOS_NVRAM  (1)
#define SCSI_NCR_TEKRAM_NVRAM   (2)
#ifdef  SCSI_NCR_NVRAM_SUPPORT
        union {
                Symbios_nvram Symbios;
                Tekram_nvram Tekram;
        } data;
#endif
} ncr_nvram;

/*
**      Structure used by sym53c8xx_detect/sym53c8xx_pci_init
**      to save data on each detected board for ncr_attach().
*/
typedef struct {
        pcidev_t  pdev;
        ncr_slot  slot;
        ncr_chip  chip;
        ncr_nvram *nvram;
        u_char host_id;
#ifdef  SCSI_NCR_PQS_PDS_SUPPORT
        u_char pqs_pds;
#endif
        int attach_done;
} ncr_device;

/*==========================================================
**
**      assert ()
**
**==========================================================
**
**      modified copy from 386bsd:/usr/include/sys/assert.h
**
**----------------------------------------------------------
*/

#define assert(expression) { \
        if (!(expression)) { \
                (void)panic( \
                        "assertion \"%s\" failed: file \"%s\", line %d\n", \
                        #expression, \
                        __FILE__, __LINE__); \
        } \
}

/*==========================================================
**
**      Command control block states.
**
**==========================================================
*/

#define HS_IDLE         (0)
#define HS_BUSY         (1)
#define HS_NEGOTIATE    (2)     /* sync/wide data transfer*/
#define HS_DISCONNECT   (3)     /* Disconnected by target */

#define HS_DONEMASK     (0x80)
#define HS_COMPLETE     (4|HS_DONEMASK)
#define HS_SEL_TIMEOUT  (5|HS_DONEMASK) /* Selection timeout      */
#define HS_RESET        (6|HS_DONEMASK) /* SCSI reset             */
#define HS_ABORTED      (7|HS_DONEMASK) /* Transfer aborted       */
#define HS_TIMEOUT      (8|HS_DONEMASK) /* Software timeout       */
#define HS_FAIL         (9|HS_DONEMASK) /* SCSI or PCI bus errors */
#define HS_UNEXPECTED   (10|HS_DONEMASK)/* Unexpected disconnect  */

#define DSA_INVALID 0xffffffff

/*==========================================================
**
**      Software Interrupt Codes
**
**==========================================================
*/

#define SIR_BAD_STATUS          (1)
#define SIR_SEL_ATN_NO_MSG_OUT  (2)
#define SIR_MSG_RECEIVED        (3)
#define SIR_MSG_WEIRD           (4)
#define SIR_NEGO_FAILED         (5)
#define SIR_NEGO_PROTO          (6)
#define SIR_SCRIPT_STOPPED      (7)
#define SIR_REJECT_TO_SEND      (8)
#define SIR_SWIDE_OVERRUN       (9)
#define SIR_SODL_UNDERRUN       (10)
#define SIR_RESEL_NO_MSG_IN     (11)
#define SIR_RESEL_NO_IDENTIFY   (12)
#define SIR_RESEL_BAD_LUN       (13)
#define SIR_TARGET_SELECTED     (14)
#define SIR_RESEL_BAD_I_T_L     (15)
#define SIR_RESEL_BAD_I_T_L_Q   (16)
#define SIR_ABORT_SENT          (17)
#define SIR_RESEL_ABORTED       (18)
#define SIR_MSG_OUT_DONE        (19)
#define SIR_AUTO_SENSE_DONE     (20)
#define SIR_DUMMY_INTERRUPT     (21)
#define SIR_DATA_OVERRUN        (22)
#define SIR_BAD_PHASE           (23)
#define SIR_MAX                 (23)

/*==========================================================
**
**      Extended error bits.
**      xerr_status field of struct ccb.
**
**==========================================================
*/

#define XE_EXTRA_DATA   (1)     /* unexpected data phase         */
#define XE_BAD_PHASE    (2)     /* illegal phase (4/5)           */
#define XE_PARITY_ERR   (4)     /* unrecovered SCSI parity error */
#define XE_SODL_UNRUN   (1<<3)
#define XE_SWIDE_OVRUN  (1<<4)

/*==========================================================
**
**      Negotiation status.
**      nego_status field       of struct ccb.
**
**==========================================================
*/

#define NS_NOCHANGE     (0)
#define NS_SYNC         (1)
#define NS_WIDE         (2)
#define NS_PPR          (4)

/*==========================================================
**
**      "Special features" of targets.
**      quirks field            of struct tcb.
**      actualquirks field      of struct ccb.
**
**==========================================================
*/

#define QUIRK_AUTOSAVE  (0x01)

/*==========================================================
**
**      Capability bits in Inquire response byte 7.
**
**==========================================================
*/

#define INQ7_QUEUE      (0x02)
#define INQ7_SYNC       (0x10)
#define INQ7_WIDE16     (0x20)

/*==========================================================
**
**      A CCB hashed table is used to retrieve CCB address 
**      from DSA value.
**
**==========================================================
*/

#define CCB_HASH_SHIFT          8
#define CCB_HASH_SIZE           (1UL << CCB_HASH_SHIFT)
#define CCB_HASH_MASK           (CCB_HASH_SIZE-1)
#define CCB_HASH_CODE(dsa)      (((dsa) >> 11) & CCB_HASH_MASK)

/*==========================================================
**
**      Declaration of structs.
**
**==========================================================
*/

struct tcb;
struct lcb;
struct ccb;
struct ncb;
struct script;

typedef struct ncb * ncb_p;
typedef struct tcb * tcb_p;
typedef struct lcb * lcb_p;
typedef struct ccb * ccb_p;

struct link {
        ncrcmd  l_cmd;
        ncrcmd  l_paddr;
};

struct  usrcmd {
        u_long  target;
        u_long  lun;
        u_long  data;
        u_long  cmd;
};

#define UC_SETSYNC      10
#define UC_SETTAGS      11
#define UC_SETDEBUG     12
#define UC_SETORDER     13
#define UC_SETWIDE      14
#define UC_SETFLAG      15
#define UC_SETVERBOSE   17
#define UC_RESETDEV     18
#define UC_CLEARDEV     19

#define UF_TRACE        (0x01)
#define UF_NODISC       (0x02)
#define UF_NOSCAN       (0x04)

/*========================================================================
**
**      Declaration of structs:         target control block
**
**========================================================================
*/
struct tcb {
        /*----------------------------------------------------------------
        **      LUN tables.
        **      An array of bus addresses is used on reselection by 
        **      the SCRIPT.
        **----------------------------------------------------------------
        */
        u_int32         *luntbl;        /* lcbs bus address table       */
        u_int32         b_luntbl;       /* bus address of this table    */
        u_int32         b_lun0;         /* bus address of lun0          */
        lcb_p           l0p;            /* lcb of LUN #0 (normal case)  */
#if MAX_LUN > 1
        lcb_p           *lmp;           /* Other lcb's [1..MAX_LUN]     */
#endif
        /*----------------------------------------------------------------
        **      Target capabilities.
        **----------------------------------------------------------------
        */
        u_char          inq_done;       /* Target capabilities received */
        u_char          inq_byte7;      /* Contains these capabilities  */

        /*----------------------------------------------------------------
        **      Some flags.
        **----------------------------------------------------------------
        */
        u_char          to_reset;       /* This target is to be reset   */

        /*----------------------------------------------------------------
        **      Pointer to the ccb used for negotiation.
        **      Prevent from starting a negotiation for all queued commands 
        **      when tagged command queuing is enabled.
        **----------------------------------------------------------------
        */
        ccb_p   nego_cp;

        /*----------------------------------------------------------------
        **      negotiation of wide and synch transfer and device quirks.
        **      sval, wval and uval are read from SCRIPTS and so have alignment 
        **      constraints.
        **----------------------------------------------------------------
        */
/*0*/   u_char  uval;
/*1*/   u_char  sval;
/*2*/   u_char  filler2;
/*3*/   u_char  wval;
        u_short period;
        u_char  minsync;
        u_char  maxoffs;
        u_char  quirks;
        u_char  widedone;

#ifdef  SCSI_NCR_INTEGRITY_CHECKING
        u_char ic_min_sync;
        u_char ic_max_width;
        u_char ic_done;
#endif
        u_char ic_maximums_set;
        u_char ppr_negotiation;

        /*----------------------------------------------------------------
        **      User settable limits and options.
        **      These limits are read from the NVRAM if present.
        **----------------------------------------------------------------
        */
        u_char  usrsync;
        u_char  usrwide;
        u_short usrtags;
        u_char  usrflag;
};

/*========================================================================
**
**      Declaration of structs:         lun control block
**
**========================================================================
*/
struct lcb {
        /*----------------------------------------------------------------
        **      On reselection, SCRIPTS use this value as a JUMP address 
        **      after the IDENTIFY has been successfully received.
        **      This field is set to 'resel_tag' if TCQ is enabled and 
        **      to 'resel_notag' if TCQ is disabled.
        **      (Must be at zero due to bad lun handling on reselection)
        **----------------------------------------------------------------
        */
/*0*/   u_int32         resel_task;

        /*----------------------------------------------------------------
        **      Task table used by the script processor to retrieve the 
        **      task corresponding to a reselected nexus. The TAG is used 
        **      as offset to determine the corresponding entry.
        **      Each entry contains the associated CCB bus address.
        **----------------------------------------------------------------
        */
        u_int32         tasktbl_0;      /* Used if TCQ not enabled      */
        u_int32         *tasktbl;
        u_int32         b_tasktbl;

        /*----------------------------------------------------------------
        **      CCB queue management.
        **----------------------------------------------------------------
        */
        XPT_QUEHEAD     busy_ccbq;      /* Queue of busy CCBs           */
        XPT_QUEHEAD     wait_ccbq;      /* Queue of waiting for IO CCBs */
        u_short         busyccbs;       /* CCBs busy for this lun       */
        u_short         queuedccbs;     /* CCBs queued to the controller*/
        u_short         queuedepth;     /* Queue depth for this lun     */
        u_short         scdev_depth;    /* SCSI device queue depth      */
        u_short         maxnxs;         /* Max possible nexuses         */

        /*----------------------------------------------------------------
        **      Control of tagged command queuing.
        **      Tags allocation is performed using a circular buffer.
        **      This avoids using a loop for tag allocation.
        **----------------------------------------------------------------
        */
        u_short         ia_tag;         /* Tag allocation index         */
        u_short         if_tag;         /* Tag release index            */
        u_char          *cb_tags;       /* Circular tags buffer         */
        u_char          inq_byte7;      /* Store unit CmdQ capability   */
        u_char          usetags;        /* Command queuing is active    */
        u_char          to_clear;       /* User wants to clear all tasks*/
        u_short         maxtags;        /* Max NR of tags asked by user */
        u_short         numtags;        /* Current number of tags       */

        /*----------------------------------------------------------------
        **      QUEUE FULL and ORDERED tag control.
        **----------------------------------------------------------------
        */
        u_short         num_good;       /* Nr of GOOD since QUEUE FULL  */
        u_short         tags_sum[2];    /* Tags sum counters            */
        u_char          tags_si;        /* Current index to tags sum    */
        u_long          tags_stime;     /* Last time we switch tags_sum */
};

/*========================================================================
**
**      Declaration of structs: actions for a task.
**
**========================================================================
**
**      It is part of the CCB and is called by the scripts processor to 
**      start or restart the data structure (nexus).
**
**------------------------------------------------------------------------
*/
struct action {
        u_int32         start;
        u_int32         restart;
};

/*========================================================================
**
**      Declaration of structs: Phase mismatch context.
**
**========================================================================
**
**      It is part of the CCB and is used as parameters for the DATA 
**      pointer. We need two contexts to handle correctly the SAVED 
**      DATA POINTER.
**
**------------------------------------------------------------------------
*/
struct pm_ctx {
        struct scr_tblmove sg;  /* Updated interrupted SG block */
        u_int32 ret;            /* SCRIPT return address        */
};

/*========================================================================
**
**      Declaration of structs:     global HEADER.
**
**========================================================================
**
**      In earlier driver versions, this substructure was copied from the 
**      ccb to a global address after selection (or reselection) and copied 
**      back before disconnect. Since we are now using LOAD/STORE DSA 
**      RELATIVE instructions, the script is able to access directly these 
**      fields, and so, this header is no more copied.
**
**------------------------------------------------------------------------
*/

struct head {
        /*----------------------------------------------------------------
        **      Start and restart SCRIPTS addresses (must be at 0).
        **----------------------------------------------------------------
        */
        struct action   go;

        /*----------------------------------------------------------------
        **      Saved data pointer.
        **      Points to the position in the script responsible for the
        **      actual transfer of data.
        **      It's written after reception of a SAVE_DATA_POINTER message.
        **      The goalpointer points after the last transfer command.
        **----------------------------------------------------------------
        */
        u_int32         savep;
        u_int32         lastp;
        u_int32         goalp;

        /*----------------------------------------------------------------
        **      Alternate data pointer.
        **      They are copied back to savep/lastp/goalp by the SCRIPTS 
        **      when the direction is unknown and the device claims data out.
        **----------------------------------------------------------------
        */
        u_int32         wlastp;
        u_int32         wgoalp;

        /*----------------------------------------------------------------
        **      Status fields.
        **----------------------------------------------------------------
        */
        u_char          status[4];      /* host status                  */
};

/*
**      LUN control block lookup.
**      We use a direct pointer for LUN #0, and a table of pointers 
**      which is only allocated for devices that support LUN(s) > 0.
*/
#if MAX_LUN <= 1
#define ncr_lp(np, tp, lun) (!lun) ? (tp)->l0p : 0
#else
#define ncr_lp(np, tp, lun) \
        (!lun) ? (tp)->l0p : (tp)->lmp ? (tp)->lmp[(lun)] : 0
#endif

/*
**      The status bytes are used by the host and the script processor.
**
**      The four bytes (status[4]) are copied to the scratchb register
**      (declared as scr0..scr3 in ncr_reg.h) just after the select/reselect,
**      and copied back just after disconnecting.
**      Inside the script the XX_REG are used.
*/

/*
**      Last four bytes (script)
*/
#define  QU_REG scr0
#define  HS_REG scr1
#define  HS_PRT nc_scr1
#define  SS_REG scr2
#define  SS_PRT nc_scr2
#define  HF_REG scr3
#define  HF_PRT nc_scr3

/*
**      Last four bytes (host)
*/
#define  actualquirks  phys.header.status[0]
#define  host_status   phys.header.status[1]
#define  scsi_status   phys.header.status[2]
#define  host_flags    phys.header.status[3]

/*
**      Host flags
*/
#define HF_IN_PM0       1u
#define HF_IN_PM1       (1u<<1)
#define HF_ACT_PM       (1u<<2)
#define HF_DP_SAVED     (1u<<3)
#define HF_AUTO_SENSE   (1u<<4)
#define HF_DATA_IN      (1u<<5)
#define HF_PM_TO_C      (1u<<6)
#define HF_EXT_ERR      (1u<<7)

#ifdef SCSI_NCR_IARB_SUPPORT
#define HF_HINT_IARB    (1u<<7)
#endif

/*
**      This one is stolen from QU_REG.:)
*/
#define HF_DATA_ST      (1u<<7)

/*==========================================================
**
**      Declaration of structs:     Data structure block
**
**==========================================================
**
**      During execution of a ccb by the script processor,
**      the DSA (data structure address) register points
**      to this substructure of the ccb.
**      This substructure contains the header with
**      the script-processor-changable data and
**      data blocks for the indirect move commands.
**
**----------------------------------------------------------
*/

struct dsb {

        /*
        **      Header.
        */

        struct head     header;

        /*
        **      Table data for Script
        */

        struct scr_tblsel  select;
        struct scr_tblmove smsg  ;
        struct scr_tblmove smsg_ext ;
        struct scr_tblmove cmd   ;
        struct scr_tblmove sense ;
        struct scr_tblmove wresid;
        struct scr_tblmove data [MAX_SCATTER];

        /*
        **      Phase mismatch contexts.
        **      We need two to handle correctly the
        **      SAVED DATA POINTER.
        */

        struct pm_ctx pm0;
        struct pm_ctx pm1;
};


/*========================================================================
**
**      Declaration of structs:     Command control block.
**
**========================================================================
*/
struct ccb {
        /*----------------------------------------------------------------
        **      This is the data structure which is pointed by the DSA 
        **      register when it is executed by the script processor.
        **      It must be the first entry.
        **----------------------------------------------------------------
        */
        struct dsb      phys;

        /*----------------------------------------------------------------
        **      The general SCSI driver provides a
        **      pointer to a control block.
        **----------------------------------------------------------------
        */
        Scsi_Cmnd       *cmd;           /* SCSI command                 */
        u_char          cdb_buf[16];    /* Copy of CDB                  */
        u_char          sense_buf[64];
        int             data_len;       /* Total data length            */
        int             segments;       /* Number of SG segments        */

        /*----------------------------------------------------------------
        **      Message areas.
        **      We prepare a message to be sent after selection.
        **      We may use a second one if the command is rescheduled 
        **      due to CHECK_CONDITION or QUEUE FULL status.
        **      Contents are IDENTIFY and SIMPLE_TAG.
        **      While negotiating sync or wide transfer,
        **      a SDTR or WDTR message is appended.
        **----------------------------------------------------------------
        */
        u_char          scsi_smsg [12];
        u_char          scsi_smsg2[12];

        /*----------------------------------------------------------------
        **      Miscellaneous status'.
        **----------------------------------------------------------------
        */
        u_char          nego_status;    /* Negotiation status           */
        u_char          xerr_status;    /* Extended error flags         */
        u_int32         extra_bytes;    /* Extraneous bytes transferred */

        /*----------------------------------------------------------------
        **      Saved info for auto-sense
        **----------------------------------------------------------------
        */
        u_char          sv_scsi_status;
        u_char          sv_xerr_status;

        /*----------------------------------------------------------------
        **      Other fields.
        **----------------------------------------------------------------
        */
        u_long          p_ccb;          /* BUS address of this CCB      */
        u_char          sensecmd[6];    /* Sense command                */
        u_char          to_abort;       /* This CCB is to be aborted    */
        u_short         tag;            /* Tag for this transfer        */
                                        /*  NO_TAG means no tag         */
        u_char          tags_si;        /* Lun tags sum index (0,1)     */

        u_char          target;
        u_char          lun;
        u_short         queued;
        ccb_p           link_ccb;       /* Host adapter CCB chain       */
        ccb_p           link_ccbh;      /* Host adapter CCB hash chain  */
        XPT_QUEHEAD     link_ccbq;      /* Link to unit CCB queue       */
        u_int32         startp;         /* Initial data pointer         */
        u_int32         lastp0;         /* Initial 'lastp'              */
        int             ext_sg;         /* Extreme data pointer, used   */
        int             ext_ofs;        /*  to calculate the residual.  */
        int             resid;
};

#define CCB_PHYS(cp,lbl)        (cp->p_ccb + offsetof(struct ccb, lbl))


/*========================================================================
**
**      Declaration of structs:     NCR device descriptor
**
**========================================================================
*/
struct ncb {
        /*----------------------------------------------------------------
        **      Idle task and invalid task actions and their bus
        **      addresses.
        **----------------------------------------------------------------
        */
        struct action   idletask;
        struct action   notask;
        struct action   bad_i_t_l;
        struct action   bad_i_t_l_q;
        u_long          p_idletask;
        u_long          p_notask;
        u_long          p_bad_i_t_l;
        u_long          p_bad_i_t_l_q;

        /*----------------------------------------------------------------
        **      Dummy lun table to protect us against target returning bad  
        **      lun number on reselection.
        **----------------------------------------------------------------
        */
        u_int32         *badluntbl;     /* Table physical address       */
        u_int32         resel_badlun;   /* SCRIPT handler BUS address   */

        /*----------------------------------------------------------------
        **      Bit 32-63 of the on-chip RAM bus address in LE format.
        **      The START_RAM64 script loads the MMRS and MMWS from this 
        **      field.
        **----------------------------------------------------------------
        */
        u_int32         scr_ram_seg;

        /*----------------------------------------------------------------
        **      CCBs management queues.
        **----------------------------------------------------------------
        */
        Scsi_Cmnd       *waiting_list;  /* Commands waiting for a CCB   */
                                        /*  when lcb is not allocated.  */
        Scsi_Cmnd       *done_list;     /* Commands waiting for done()  */
                                        /* callback to be invoked.      */ 
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,1,93)
        spinlock_t      smp_lock;       /* Lock for SMP threading       */
#endif

        /*----------------------------------------------------------------
        **      Chip and controller indentification.
        **----------------------------------------------------------------
        */
        int             unit;           /* Unit number                  */
        char            chip_name[8];   /* Chip name                    */
        char            inst_name[16];  /* ncb instance name            */

        /*----------------------------------------------------------------
        **      Initial value of some IO register bits.
        **      These values are assumed to have been set by BIOS, and may 
        **      be used for probing adapter implementation differences.
        **----------------------------------------------------------------
        */
        u_char  sv_scntl0, sv_scntl3, sv_dmode, sv_dcntl, sv_ctest3, sv_ctest4,
                sv_ctest5, sv_gpcntl, sv_stest2, sv_stest4, sv_stest1, sv_scntl4;

        /*----------------------------------------------------------------
        **      Actual initial value of IO register bits used by the 
        **      driver. They are loaded at initialisation according to  
        **      features that are to be enabled.
        **----------------------------------------------------------------
        */
        u_char  rv_scntl0, rv_scntl3, rv_dmode, rv_dcntl, rv_ctest3, rv_ctest4, 
                rv_ctest5, rv_stest2, rv_ccntl0, rv_ccntl1, rv_scntl4;

        /*----------------------------------------------------------------
        **      Target data.
        **      Target control block bus address array used by the SCRIPT 
        **      on reselection.
        **----------------------------------------------------------------
        */
        struct tcb      target[MAX_TARGET];
        u_int32         *targtbl;

        /*----------------------------------------------------------------
        **      Virtual and physical bus addresses of the chip.
        **----------------------------------------------------------------
        */
#ifndef SCSI_NCR_PCI_MEM_NOT_SUPPORTED
        u_long          base_va;        /* MMIO base virtual address    */
        u_long          base2_va;       /* On-chip RAM virtual address  */
#endif
        u_long          base_ba;        /* MMIO base bus address        */
        u_long          base_io;        /* IO space base address        */
        u_long          base_ws;        /* (MM)IO window size           */
        u_long          base2_ba;       /* On-chip RAM bus address      */
        u_long          base2_ws;       /* On-chip RAM window size      */
        u_int           irq;            /* IRQ number                   */
        volatile                        /* Pointer to volatile for      */
        struct ncr_reg  *reg;           /*  memory mapped IO.           */

        /*----------------------------------------------------------------
        **      SCRIPTS virtual and physical bus addresses.
        **      'script'  is loaded in the on-chip RAM if present.
        **      'scripth' stays in main memory for all chips except the 
        **      53C895A and 53C896 that provide 8K on-chip RAM.
        **----------------------------------------------------------------
        */
        struct script   *script0;       /* Copies of script and scripth */
        struct scripth  *scripth0;      /*  relocated for this ncb.     */
        u_long          p_script;       /* Actual script and scripth    */
        u_long          p_scripth;      /*  bus addresses.              */
        u_long          p_scripth0;

        /*----------------------------------------------------------------
        **      General controller parameters and configuration.
        **----------------------------------------------------------------
        */
        pcidev_t        pdev;
        u_short         device_id;      /* PCI device id                */
        u_char          revision_id;    /* PCI device revision id       */
        u_char          bus;            /* PCI BUS number               */
        u_char          device_fn;      /* PCI BUS device and function  */
        u_char          myaddr;         /* SCSI id of the adapter       */
        u_char          maxburst;       /* log base 2 of dwords burst   */
        u_char          maxwide;        /* Maximum transfer width       */
        u_char          minsync;        /* Minimum sync period factor   */
        u_char          maxsync;        /* Maximum sync period factor   */
        u_char          maxoffs;        /* Max scsi offset              */
        u_char          maxoffs_st;     /* Max scsi offset in ST mode   */
        u_char          multiplier;     /* Clock multiplier (1,2,4)     */
        u_char          clock_divn;     /* Number of clock divisors     */
        u_long          clock_khz;      /* SCSI clock frequency in KHz  */
        u_int           features;       /* Chip features map            */

        /*----------------------------------------------------------------
        **      Range for the PCI clock frequency measurement result
        **      that ensures the algorithm used by the driver can be 
        **      trusted for the SCSI clock frequency measurement.
        **      (Assuming a PCI clock frequency of 33 MHz).
        **----------------------------------------------------------------
        */
        u_int           pciclock_min;
        u_int           pciclock_max;

        /*----------------------------------------------------------------
        **      Start queue management.
        **      It is filled up by the host processor and accessed by the 
        **      SCRIPTS processor in order to start SCSI commands.
        **----------------------------------------------------------------
        */
        u_long          p_squeue;       /* Start queue BUS address      */
        u_int32         *squeue;        /* Start queue virtual address  */
        u_short         squeueput;      /* Next free slot of the queue  */
        u_short         actccbs;        /* Number of allocated CCBs     */
        u_short         queuedepth;     /* Start queue depth            */

        /*----------------------------------------------------------------
        **      Command completion queue.
        **      It is the same size as the start queue to avoid overflow.
        **----------------------------------------------------------------
        */
        u_short         dqueueget;      /* Next position to scan        */
        u_int32         *dqueue;        /* Completion (done) queue      */

        /*----------------------------------------------------------------
        **      Timeout handler.
        **----------------------------------------------------------------
        */
        struct timer_list timer;        /* Timer handler link header    */
        u_long          lasttime;
        u_long          settle_time;    /* Resetting the SCSI BUS       */

        /*----------------------------------------------------------------
        **      Debugging and profiling.
        **----------------------------------------------------------------
        */
        struct ncr_reg  regdump;        /* Register dump                */
        u_long          regtime;        /* Time it has been done        */

        /*----------------------------------------------------------------
        **      Miscellaneous buffers accessed by the scripts-processor.
        **      They shall be DWORD aligned, because they may be read or 
        **      written with a script command.
        **----------------------------------------------------------------
        */
        u_char          msgout[12];     /* Buffer for MESSAGE OUT       */
        u_char          msgin [12];     /* Buffer for MESSAGE IN        */
        u_int32         lastmsg;        /* Last SCSI message sent       */
        u_char          scratch;        /* Scratch for SCSI receive     */

        /*----------------------------------------------------------------
        **      Miscellaneous configuration and status parameters.
        **----------------------------------------------------------------
        */
        u_char          scsi_mode;      /* Current SCSI BUS mode        */
        u_char          order;          /* Tag order to use             */
        u_char          verbose;        /* Verbosity for this controller*/
        u_int32         ncr_cache;      /* Used for cache test at init. */
        u_long          p_ncb;          /* BUS address of this NCB      */

        /*----------------------------------------------------------------
        **      CCB lists and queue.
        **----------------------------------------------------------------
        */
        ccb_p ccbh[CCB_HASH_SIZE];      /* CCB hashed by DSA value      */
        struct ccb      *ccbc;          /* CCB chain                    */
        XPT_QUEHEAD     free_ccbq;      /* Queue of available CCBs      */

        /*----------------------------------------------------------------
        **      IMMEDIATE ARBITRATION (IARB) control.
        **      We keep track in 'last_cp' of the last CCB that has been 
        **      queued to the SCRIPTS processor and clear 'last_cp' when 
        **      this CCB completes. If last_cp is not zero at the moment 
        **      we queue a new CCB, we set a flag in 'last_cp' that is 
        **      used by the SCRIPTS as a hint for setting IARB.
        **      We donnot set more than 'iarb_max' consecutive hints for 
        **      IARB in order to leave devices a chance to reselect.
        **      By the way, any non zero value of 'iarb_max' is unfair. :)
        **----------------------------------------------------------------
        */
#ifdef SCSI_NCR_IARB_SUPPORT
        struct ccb      *last_cp;       /* Last queud CCB used for IARB */
        u_short         iarb_max;       /* Max. # consecutive IARB hints*/
        u_short         iarb_count;     /* Actual # of these hints      */
#endif

        /*----------------------------------------------------------------
        **      We need the LCB in order to handle disconnections and 
        **      to count active CCBs for task management. So, we use 
        **      a unique CCB for LUNs we donnot have the LCB yet.
        **      This queue normally should have at most 1 element.
        **----------------------------------------------------------------
        */
        XPT_QUEHEAD     b0_ccbq;

        /*----------------------------------------------------------------
        **      We use a different scatter function for 896 rev 1.
        **----------------------------------------------------------------
        */
        int (*scatter) (ncb_p, ccb_p, Scsi_Cmnd *);

        /*----------------------------------------------------------------
        **      Command abort handling.
        **      We need to synchronize tightly with the SCRIPTS 
        **      processor in order to handle things correctly.
        **----------------------------------------------------------------
        */
        u_char          abrt_msg[4];    /* Message to send buffer       */
        struct scr_tblmove abrt_tbl;    /* Table for the MOV of it      */
        struct scr_tblsel  abrt_sel;    /* Sync params for selection    */
        u_char          istat_sem;      /* Tells the chip to stop (SEM) */

        /*----------------------------------------------------------------
        **      Fields that should be removed or changed.
        **----------------------------------------------------------------
        */
        struct usrcmd   user;           /* Command from user            */
        volatile u_char release_stage;  /* Synchronisation stage on release  */

        /*----------------------------------------------------------------
        **      Fields that are used (primarily) for integrity check
        **----------------------------------------------------------------
        */
        unsigned char  check_integrity; /* Enable midlayer integ. check on
                                         * bus scan. */
#ifdef  SCSI_NCR_INTEGRITY_CHECKING
        unsigned char check_integ_par;  /* Set if par or Init. Det. error
                                         * used only during integ check */
#endif
};

#define NCB_PHYS(np, lbl)        (np->p_ncb + offsetof(struct ncb, lbl))
#define NCB_SCRIPT_PHYS(np,lbl)  (np->p_script  + offsetof (struct script, lbl))
#define NCB_SCRIPTH_PHYS(np,lbl) (np->p_scripth + offsetof (struct scripth,lbl))
#define NCB_SCRIPTH0_PHYS(np,lbl) (np->p_scripth0+offsetof (struct scripth,lbl))

/*==========================================================
**
**
**      Script for NCR-Processor.
**
**      Use ncr_script_fill() to create the variable parts.
**      Use ncr_script_copy_and_bind() to make a copy and
**      bind to physical addresses.
**
**
**==========================================================
**
**      We have to know the offsets of all labels before
**      we reach them (for forward jumps).
**      Therefore we declare a struct here.
**      If you make changes inside the script,
**      DONT FORGET TO CHANGE THE LENGTHS HERE!
**
**----------------------------------------------------------
*/

/*
**      Script fragments which are loaded into the on-chip RAM 
**      of 825A, 875, 876, 895, 895A and 896 chips.
*/
struct script {
        ncrcmd  start           [ 14];
        ncrcmd  getjob_begin    [  4];
        ncrcmd  getjob_end      [  4];
        ncrcmd  select          [  8];
        ncrcmd  wf_sel_done     [  2];
        ncrcmd  send_ident      [  2];
#ifdef SCSI_NCR_IARB_SUPPORT
        ncrcmd  select2         [  8];
#else
        ncrcmd  select2         [  2];
#endif
        ncrcmd  command         [  2];
        ncrcmd  dispatch        [ 28];
        ncrcmd  sel_no_cmd      [ 10];
        ncrcmd  init            [  6];
        ncrcmd  clrack          [  4];
        ncrcmd  disp_status     [  4];
        ncrcmd  datai_done      [ 26];
        ncrcmd  datao_done      [ 12];
        ncrcmd  ign_i_w_r_msg   [  4];
        ncrcmd  datai_phase     [  2];
        ncrcmd  datao_phase     [  4];
        ncrcmd  msg_in          [  2];
        ncrcmd  msg_in2         [ 10];
#ifdef SCSI_NCR_IARB_SUPPORT
        ncrcmd  status          [ 14];
#else
        ncrcmd  status          [ 10];
#endif
        ncrcmd  complete        [  8];
#ifdef SCSI_NCR_PCIQ_MAY_REORDER_WRITES
        ncrcmd  complete2       [ 12];
#else
        ncrcmd  complete2       [ 10];
#endif
#ifdef SCSI_NCR_PCIQ_SYNC_ON_INTR
        ncrcmd  done            [ 18];
#else
        ncrcmd  done            [ 14];
#endif
        ncrcmd  done_end        [  2];
        ncrcmd  save_dp         [  8];
        ncrcmd  restore_dp      [  4];
        ncrcmd  disconnect      [ 20];
#ifdef SCSI_NCR_IARB_SUPPORT
        ncrcmd  idle            [  4];
#else
        ncrcmd  idle            [  2];
#endif
#ifdef SCSI_NCR_IARB_SUPPORT
        ncrcmd  ungetjob        [  6];
#else
        ncrcmd  ungetjob        [  4];
#endif
        ncrcmd  reselect        [  4];
        ncrcmd  reselected      [ 20];
        ncrcmd  resel_scntl4    [ 30];
#if   MAX_TASKS*4 > 512
        ncrcmd  resel_tag       [ 18];
#elif MAX_TASKS*4 > 256
        ncrcmd  resel_tag       [ 12];
#else
        ncrcmd  resel_tag       [  8];
#endif
        ncrcmd  resel_go        [  6];
        ncrcmd  resel_notag     [  2];
        ncrcmd  resel_dsa       [  8];
        ncrcmd  data_in         [MAX_SCATTER * SCR_SG_SIZE];
        ncrcmd  data_in2        [  4];
        ncrcmd  data_out        [MAX_SCATTER * SCR_SG_SIZE];
        ncrcmd  data_out2       [  4];
        ncrcmd  pm0_data        [ 12];
        ncrcmd  pm0_data_out    [  6];
        ncrcmd  pm0_data_end    [  6];
        ncrcmd  pm1_data        [ 12];
        ncrcmd  pm1_data_out    [  6];
        ncrcmd  pm1_data_end    [  6];
};

/*
**      Script fragments which stay in main memory for all chips 
**      except for the 895A and 896 that support 8K on-chip RAM.
*/
struct scripth {
        ncrcmd  start64         [  2];
        ncrcmd  no_data         [  2];
        ncrcmd  sel_for_abort   [ 18];
        ncrcmd  sel_for_abort_1 [  2];
        ncrcmd  select_no_atn   [  8];
        ncrcmd  wf_sel_done_no_atn [ 4];

        ncrcmd  msg_in_etc      [ 14];
        ncrcmd  msg_received    [  4];
        ncrcmd  msg_weird_seen  [  4];
        ncrcmd  msg_extended    [ 20];
        ncrcmd  msg_bad         [  6];
        ncrcmd  msg_weird       [  4];
        ncrcmd  msg_weird1      [  8];

        ncrcmd  wdtr_resp       [  6];
        ncrcmd  send_wdtr       [  4];
        ncrcmd  sdtr_resp       [  6];
        ncrcmd  send_sdtr       [  4];
        ncrcmd  ppr_resp        [  6];
        ncrcmd  send_ppr        [  4];
        ncrcmd  nego_bad_phase  [  4];
        ncrcmd  msg_out         [  4];
        ncrcmd  msg_out_done    [  4];
        ncrcmd  data_ovrun      [  2];
        ncrcmd  data_ovrun1     [ 22];
        ncrcmd  data_ovrun2     [  8];
        ncrcmd  abort_resel     [ 16];
        ncrcmd  resend_ident    [  4];
        ncrcmd  ident_break     [  4];
        ncrcmd  ident_break_atn [  4];
        ncrcmd  sdata_in        [  6];
        ncrcmd  data_io         [  2];
        ncrcmd  data_io_com     [  8];
        ncrcmd  data_io_out     [ 12];
        ncrcmd  resel_bad_lun   [  4];
        ncrcmd  bad_i_t_l       [  4];
        ncrcmd  bad_i_t_l_q     [  4];
        ncrcmd  bad_status      [  6];
        ncrcmd  tweak_pmj       [ 12];
        ncrcmd  pm_handle       [ 20];
        ncrcmd  pm_handle1      [  4];
        ncrcmd  pm_save         [  4];
        ncrcmd  pm0_save        [ 14];
        ncrcmd  pm1_save        [ 14];

        /* WSR handling */
#ifdef SYM_DEBUG_PM_WITH_WSR
        ncrcmd  pm_wsr_handle   [ 44];
#else
        ncrcmd  pm_wsr_handle   [ 42];
#endif
        ncrcmd  wsr_ma_helper   [  4];

        /* Data area */
        ncrcmd  zero            [  1];
        ncrcmd  scratch         [  1];
        ncrcmd  scratch1        [  1];
        ncrcmd  pm0_data_addr   [  1];
        ncrcmd  pm1_data_addr   [  1];
        ncrcmd  saved_dsa       [  1];
        ncrcmd  saved_drs       [  1];
        ncrcmd  done_pos        [  1];
        ncrcmd  startpos        [  1];
        ncrcmd  targtbl         [  1];
        /* End of data area */

#ifdef SCSI_NCR_PCI_MEM_NOT_SUPPORTED
        ncrcmd  start_ram       [  1];
        ncrcmd  script0_ba      [  4];
        ncrcmd  start_ram64     [  3];
        ncrcmd  script0_ba64    [  3];
        ncrcmd  scripth0_ba64   [  6];
        ncrcmd  ram_seg64       [  1];
#endif
        ncrcmd  snooptest       [  6];
        ncrcmd  snoopend        [  2];
};

/*==========================================================
**
**
**      Function headers.
**
**
**==========================================================
*/

static  ccb_p   ncr_alloc_ccb   (ncb_p np);
static  void    ncr_complete    (ncb_p np, ccb_p cp);
static  void    ncr_exception   (ncb_p np);
static  void    ncr_free_ccb    (ncb_p np, ccb_p cp);
static  ccb_p   ncr_ccb_from_dsa(ncb_p np, u_long dsa);
static  void    ncr_init_tcb    (ncb_p np, u_char tn);
static  lcb_p   ncr_alloc_lcb   (ncb_p np, u_char tn, u_char ln);
static  lcb_p   ncr_setup_lcb   (ncb_p np, u_char tn, u_char ln,
                                 u_char *inq_data);
static  void    ncr_getclock    (ncb_p np, int mult);
static  u_int   ncr_getpciclock (ncb_p np);
static  void    ncr_selectclock (ncb_p np, u_char scntl3);
static  ccb_p   ncr_get_ccb     (ncb_p np, u_char tn, u_char ln);
static  void    ncr_init        (ncb_p np, int reset, char * msg, u_long code);
static  void    ncr_int_sbmc    (ncb_p np);
static  void    ncr_int_par     (ncb_p np, u_short sist);
static  void    ncr_int_ma      (ncb_p np);
static  void    ncr_int_sir     (ncb_p np);
static  void    ncr_int_sto     (ncb_p np);
static  void    ncr_int_udc     (ncb_p np);
static  void    ncr_negotiate   (ncb_p np, tcb_p tp);
static  int     ncr_prepare_nego(ncb_p np, ccb_p cp, u_char *msgptr);
#ifdef  SCSI_NCR_INTEGRITY_CHECKING
static  int     ncr_ic_nego(ncb_p np, ccb_p cp, Scsi_Cmnd *cmd, u_char *msgptr);
#endif
static  void    ncr_script_copy_and_bind
                                (ncb_p np, ncrcmd *src, ncrcmd *dst, int len);
static  void    ncr_script_fill (struct script * scr, struct scripth * scripth);
static  int     ncr_scatter_896R1 (ncb_p np, ccb_p cp, Scsi_Cmnd *cmd);
static  int     ncr_scatter     (ncb_p np, ccb_p cp, Scsi_Cmnd *cmd);
static  void    ncr_getsync     (ncb_p np, u_char sfac, u_char *fakp, u_char *scntl3p);
static  void    ncr_get_xfer_info(ncb_p np, tcb_p tp, u_char *factor, u_char *offset, u_char *width);
static  void    ncr_setsync     (ncb_p np, ccb_p cp, u_char scntl3, u_char sxfer, u_char scntl4);
static void     ncr_set_sync_wide_status (ncb_p np, u_char target);
static  void    ncr_setup_tags  (ncb_p np, u_char tn, u_char ln);
static  void    ncr_setwide     (ncb_p np, ccb_p cp, u_char wide, u_char ack);
static  void    ncr_setsyncwide (ncb_p np, ccb_p cp, u_char scntl3, u_char sxfer, u_char scntl4, u_char wide);
static  int     ncr_show_msg    (u_char * msg);
static  void    ncr_print_msg   (ccb_p cp, char *label, u_char * msg);
static  int     ncr_snooptest   (ncb_p np);
static  void    ncr_timeout     (ncb_p np);
static  void    ncr_wakeup      (ncb_p np, u_long code);
static  int     ncr_wakeup_done (ncb_p np);
static  void    ncr_start_next_ccb (ncb_p np, lcb_p lp, int maxn);
static  void    ncr_put_start_queue(ncb_p np, ccb_p cp);
static  void    ncr_chip_reset  (ncb_p np);
static  void    ncr_soft_reset  (ncb_p np);
static  void    ncr_start_reset (ncb_p np);
static  int     ncr_reset_scsi_bus (ncb_p np, int enab_int, int settle_delay);
static  int     ncr_compute_residual (ncb_p np, ccb_p cp);

#ifdef SCSI_NCR_USER_COMMAND_SUPPORT
static  void    ncr_usercmd     (ncb_p np);
#endif

static int ncr_attach (Scsi_Host_Template *tpnt, int unit, ncr_device *device);
static void ncr_free_resources(ncb_p np);

static void insert_into_waiting_list(ncb_p np, Scsi_Cmnd *cmd);
static Scsi_Cmnd *retrieve_from_waiting_list(int to_remove, ncb_p np, Scsi_Cmnd *cmd);
static void process_waiting_list(ncb_p np, int sts);

#define remove_from_waiting_list(np, cmd) \
                retrieve_from_waiting_list(1, (np), (cmd))
#define requeue_waiting_list(np) process_waiting_list((np), DID_OK)
#define reset_waiting_list(np) process_waiting_list((np), DID_RESET)

#ifdef SCSI_NCR_NVRAM_SUPPORT
static  void    ncr_get_nvram          (ncr_device *devp, ncr_nvram *nvp);
static  int     sym_read_Tekram_nvram  (ncr_slot *np, u_short device_id,
                                        Tekram_nvram *nvram);
static  int     sym_read_Symbios_nvram (ncr_slot *np, Symbios_nvram *nvram);
#endif

/*==========================================================
**
**
**      Global static data.
**
**
**==========================================================
*/

static inline char *ncr_name (ncb_p np)
{
        return np->inst_name;
}


/*==========================================================
**
**
**      Scripts for NCR-Processor.
**
**      Use ncr_script_bind for binding to physical addresses.
**
**
**==========================================================
**
**      NADDR generates a reference to a field of the controller data.
**      PADDR generates a reference to another part of the script.
**      RADDR generates a reference to a script processor register.
**      FADDR generates a reference to a script processor register
**              with offset.
**
**----------------------------------------------------------
*/

#define RELOC_SOFTC     0x40000000
#define RELOC_LABEL     0x50000000
#define RELOC_REGISTER  0x60000000
#if 0
#define RELOC_KVAR      0x70000000
#endif
#define RELOC_LABELH    0x80000000
#define RELOC_MASK      0xf0000000

#define NADDR(label)    (RELOC_SOFTC | offsetof(struct ncb, label))
#define PADDR(label)    (RELOC_LABEL | offsetof(struct script, label))
#define PADDRH(label)   (RELOC_LABELH | offsetof(struct scripth, label))
#define RADDR(label)    (RELOC_REGISTER | REG(label))
#define FADDR(label,ofs)(RELOC_REGISTER | ((REG(label))+(ofs)))
#define KVAR(which)     (RELOC_KVAR | (which))

#define SCR_DATA_ZERO   0xf00ff00f

#ifdef  RELOC_KVAR
#define SCRIPT_KVAR_JIFFIES     (0)
#define SCRIPT_KVAR_FIRST       SCRIPT_KVAR_JIFFIES
#define SCRIPT_KVAR_LAST        SCRIPT_KVAR_JIFFIES
/*
 * Kernel variables referenced in the scripts.
 * THESE MUST ALL BE ALIGNED TO A 4-BYTE BOUNDARY.
 */
static void *script_kvars[] __initdata =
        { (void *)&jiffies };
#endif

static  struct script script0 __initdata = {
/*--------------------------< START >-----------------------*/ {
        /*
        **      This NOP will be patched with LED ON
        **      SCR_REG_REG (gpreg, SCR_AND, 0xfe)
        */
        SCR_NO_OP,
                0,
        /*
        **      Clear SIGP.
        */
        SCR_FROM_REG (ctest2),
                0,

        /*
        **      Stop here if the C code wants to perform 
        **      some error recovery procedure manually.
        **      (Indicate this by setting SEM in ISTAT)
        */
        SCR_FROM_REG (istat),
                0,
        /*
        **      Report to the C code the next position in 
        **      the start queue the SCRIPTS will schedule.
        **      The C code must not change SCRATCHA.
        */
        SCR_LOAD_ABS (scratcha, 4),
                PADDRH (startpos),
        SCR_INT ^ IFTRUE (MASK (SEM, SEM)),
                SIR_SCRIPT_STOPPED,

        /*
        **      Start the next job.
        **
        **      @DSA     = start point for this job.
        **      SCRATCHA = address of this job in the start queue.
        **
        **      We will restore startpos with SCRATCHA if we fails the 
        **      arbitration or if it is the idle job.
        **
        **      The below GETJOB_BEGIN to GETJOB_END section of SCRIPTS 
        **      is a critical path. If it is partially executed, it then 
        **      may happen that the job address is not yet in the DSA 
        **      and the next queue position points to the next JOB.
        */
        SCR_LOAD_ABS (dsa, 4),
                PADDRH (startpos),
        SCR_LOAD_REL (temp, 4),
                4,
}/*-------------------------< GETJOB_BEGIN >------------------*/,{
        SCR_STORE_ABS (temp, 4),
                PADDRH (startpos),
        SCR_LOAD_REL (dsa, 4),
                0,
}/*-------------------------< GETJOB_END >--------------------*/,{
        SCR_LOAD_REL (temp, 4),
                0,
        SCR_RETURN,
                0,

}/*-------------------------< SELECT >----------------------*/,{
        /*
        **      DSA     contains the address of a scheduled
        **              data structure.
        **
        **      SCRATCHA contains the address of the start queue  
        **              entry which points to the next job.
        **
        **      Set Initiator mode.
        **
        **      (Target mode is left as an exercise for the reader)
        */

        SCR_CLR (SCR_TRG),
                0,
        /*
        **      And try to select this target.
        */
        SCR_SEL_TBL_ATN ^ offsetof (struct dsb, select),
                PADDR (ungetjob),
        /*
        **      Now there are 4 possibilities:
        **
        **      (1) The ncr loses arbitration.
        **      This is ok, because it will try again,
        **      when the bus becomes idle.
        **      (But beware of the timeout function!)
        **
        **      (2) The ncr is reselected.
        **      Then the script processor takes the jump
        **      to the RESELECT label.
        **
        **      (3) The ncr wins arbitration.
        **      Then it will execute SCRIPTS instruction until 
        **      the next instruction that checks SCSI phase.
        **      Then will stop and wait for selection to be 
        **      complete or selection time-out to occur.
        **
        **      After having won arbitration, the ncr SCRIPTS  
        **      processor is able to execute instructions while 
        **      the SCSI core is performing SCSI selection. But 
        **      some script instruction that is not waiting for 
        **      a valid phase (or selection timeout) to occur 
        **      breaks the selection procedure, by probably 
        **      affecting timing requirements.
        **      So we have to wait immediately for the next phase 
        **      or the selection to complete or time-out.
        */

        /*
        **      load the savep (saved pointer) into
        **      the actual data pointer.
        */
        SCR_LOAD_REL (temp, 4),
                offsetof (struct ccb, phys.header.savep),
        /*
        **      Initialize the status registers
        */
        SCR_LOAD_REL (scr0, 4),
                offsetof (struct ccb, phys.header.status),

}/*-------------------------< WF_SEL_DONE >----------------------*/,{
        SCR_INT ^ IFFALSE (WHEN (SCR_MSG_OUT)),
                SIR_SEL_ATN_NO_MSG_OUT,
}/*-------------------------< SEND_IDENT >----------------------*/,{
        /*
        **      Selection complete.
        **      Send the IDENTIFY and SIMPLE_TAG messages
        **      (and the M_X_SYNC_REQ / M_X_WIDE_REQ message)
        */
        SCR_MOVE_TBL ^ SCR_MSG_OUT,
                offsetof (struct dsb, smsg),
}/*-------------------------< SELECT2 >----------------------*/,{
#ifdef SCSI_NCR_IARB_SUPPORT
        /*
        **      Set IMMEDIATE ARBITRATION if we have been given 
        **      a hint to do so. (Some job to do after this one).
        */
        SCR_FROM_REG (HF_REG),
                0,
        SCR_JUMPR ^ IFFALSE (MASK (HF_HINT_IARB, HF_HINT_IARB)),
                8,
        SCR_REG_REG (scntl1, SCR_OR, IARB),
                0,
#endif
        /*
        **      Anticipate the COMMAND phase.
        **      This is the PHASE we expect at this point.
        */
        SCR_JUMP ^ IFFALSE (WHEN (SCR_COMMAND)),
                PADDR (sel_no_cmd),

}/*-------------------------< COMMAND >--------------------*/,{
        /*
        **      ... and send the command
        */
        SCR_MOVE_TBL ^ SCR_COMMAND,
                offsetof (struct dsb, cmd),

}/*-----------------------< DISPATCH >----------------------*/,{
        /*
        **      MSG_IN is the only phase that shall be 
        **      entered at least once for each (re)selection.
        **      So we test it first.
        */
        SCR_JUMP ^ IFTRUE (WHEN (SCR_MSG_IN)),
                PADDR (msg_in),
        SCR_JUMP ^ IFTRUE (IF (SCR_DATA_OUT)),
                PADDR (datao_phase),
        SCR_JUMP ^ IFTRUE (IF (SCR_DATA_IN)),
                PADDR (datai_phase),
        SCR_JUMP ^ IFTRUE (IF (SCR_STATUS)),
                PADDR (status),
        SCR_JUMP ^ IFTRUE (IF (SCR_COMMAND)),
                PADDR (command),
        SCR_JUMP ^ IFTRUE (IF (SCR_MSG_OUT)),
                PADDRH (msg_out),
        /*
         *  Discard as many illegal phases as 
         *  required and tell the C code about.
         */
        SCR_JUMPR ^ IFFALSE (WHEN (SCR_ILG_OUT)),
                16,
        SCR_MOVE_ABS (1) ^ SCR_ILG_OUT,
                NADDR (scratch),
        SCR_JUMPR ^ IFTRUE (WHEN (SCR_ILG_OUT)),
                -16,
        SCR_JUMPR ^ IFFALSE (WHEN (SCR_ILG_IN)),
                16,
        SCR_MOVE_ABS (1) ^ SCR_ILG_IN,
                NADDR (scratch),
        SCR_JUMPR ^ IFTRUE (WHEN (SCR_ILG_IN)),
                -16,
        SCR_INT,
                SIR_BAD_PHASE,
        SCR_JUMP,
                PADDR (dispatch),
}/*---------------------< SEL_NO_CMD >----------------------*/,{
        /*
        **      The target does not switch to command 
        **      phase after IDENTIFY has been sent.
        **
        **      If it stays in MSG OUT phase send it 
        **      the IDENTIFY again.
        */
        SCR_JUMP ^ IFTRUE (WHEN (SCR_MSG_OUT)),
                PADDRH (resend_ident),
        /*
        **      If target does not switch to MSG IN phase 
        **      and we sent a negotiation, assert the 
        **      failure immediately.
        */
        SCR_JUMP ^ IFTRUE (WHEN (SCR_MSG_IN)),
                PADDR (dispatch),
        SCR_FROM_REG (HS_REG),
                0,
        SCR_INT ^ IFTRUE (DATA (HS_NEGOTIATE)),
                SIR_NEGO_FAILED,
        /*
        **      Jump to dispatcher.
        */
        SCR_JUMP,
                PADDR (dispatch),

}/*-------------------------< INIT >------------------------*/,{
        /*
        **      Wait for the SCSI RESET signal to be 
        **      inactive before restarting operations, 
        **      since the chip may hang on SEL_ATN 
        **      if SCSI RESET is active.
        */
        SCR_FROM_REG (sstat0),
                0,
        SCR_JUMPR ^ IFTRUE (MASK (IRST, IRST)),
                -16,
        SCR_JUMP,
                PADDR (start),
}/*-------------------------< CLRACK >----------------------*/,{
        /*
        **      Terminate possible pending message phase.
        */
        SCR_CLR (SCR_ACK),
                0,
        SCR_JUMP,
                PADDR (dispatch),

}/*-------------------------< DISP_STATUS >----------------------*/,{
        /*
        **      Anticipate STATUS phase.
        **
        **      Does spare 3 SCRIPTS instructions when we have 
        **      completed the INPUT of the data.
        */
        SCR_JUMP ^ IFTRUE (WHEN (SCR_STATUS)),
                PADDR (status),
        SCR_JUMP,
                PADDR (dispatch),

}/*-------------------------< DATAI_DONE >-------------------*/,{
        /*
         *  If the device wants us to send more data,
         *  we must count the extra bytes.
         */
        SCR_JUMP ^ IFTRUE (WHEN (SCR_DATA_IN)),
                PADDRH (data_ovrun),
        /*
        **      If the SWIDE is not full, jump to dispatcher.
        **      We anticipate a STATUS phase.
        **      If we get later an IGNORE WIDE RESIDUE, we 
        **      will alias it as a MODIFY DP (-1).
        */
        SCR_FROM_REG (scntl2),
                0,
        SCR_JUMP ^ IFFALSE (MASK (WSR, WSR)),
                PADDR (disp_status),
        /*
        **      The SWIDE is full.
        **      Clear this condition.
        */
        SCR_REG_REG (scntl2, SCR_OR, WSR),
                0,
        /*
         *      We are expecting an IGNORE RESIDUE message
         *      from the device, otherwise we are in data
         *      overrun condition. Check against MSG_IN phase.
        */
        SCR_INT ^ IFFALSE (WHEN (SCR_MSG_IN)),
                SIR_SWIDE_OVERRUN,      
        SCR_JUMP ^ IFFALSE (WHEN (SCR_MSG_IN)),
                PADDR (disp_status),
        /*
         *      We are in MSG_IN phase,
         *      Read the first byte of the message.
         *      If it is not an IGNORE RESIDUE message,
         *      signal overrun and jump to message
         *      processing.
         */
        SCR_MOVE_ABS (1) ^ SCR_MSG_IN,
                NADDR (msgin[0]),
        SCR_INT ^ IFFALSE (DATA (M_IGN_RESIDUE)),
                SIR_SWIDE_OVERRUN,      
        SCR_JUMP ^ IFFALSE (DATA (M_IGN_RESIDUE)),
                PADDR (msg_in2),

        /*
         *      We got the message we expected.
         *      Read the 2nd byte, and jump to dispatcher.
         */
        SCR_CLR (SCR_ACK),
                0,
        SCR_MOVE_ABS (1) ^ SCR_MSG_IN,
                NADDR (msgin[1]),
        SCR_CLR (SCR_ACK),
                0,
        SCR_JUMP,
                PADDR (disp_status),

}/*-------------------------< DATAO_DONE >-------------------*/,{
        /*
         *  If the device wants us to send more data,
         *  we must count the extra bytes.
         */
        SCR_JUMP ^ IFTRUE (WHEN (SCR_DATA_OUT)),
                PADDRH (data_ovrun),
        /*
        **      If the SODL is not full jump to dispatcher.
        **      We anticipate a MSG IN phase or a STATUS phase.
        */
        SCR_FROM_REG (scntl2),
                0,
        SCR_JUMP ^ IFFALSE (MASK (WSS, WSS)),
                PADDR (disp_status),
        /*
        **      The SODL is full, clear this condition.
        */
        SCR_REG_REG (scntl2, SCR_OR, WSS),
                0,
        /*
        **      And signal a DATA UNDERRUN condition 
        **      to the C code.
        */
        SCR_INT,
                SIR_SODL_UNDERRUN,
        SCR_JUMP,
                PADDR (dispatch),

}/*-------------------------< IGN_I_W_R_MSG >--------------*/,{
        /*
        **      We jump here from the phase mismatch interrupt, 
        **      When we have a SWIDE and the device has presented 
        **      a IGNORE WIDE RESIDUE message on the BUS.
        **      We just have to throw away this message and then 
        **      to jump to dispatcher.
        */
        SCR_MOVE_ABS (2) ^ SCR_MSG_IN,
                NADDR (scratch),
        /*
        **      Clear ACK and jump to dispatcher.
        */
        SCR_JUMP,
                PADDR (clrack),

}/*-------------------------< DATAI_PHASE >------------------*/,{
        SCR_RETURN,
                0,
}/*-------------------------< DATAO_PHASE >------------------*/,{
        /*
        **      Patch for 53c1010_66 only - to allow A0 part
        **      to operate properly in a 33MHz PCI bus.
        **
        **      SCR_REG_REG(scntl4, SCR_OR, 0x0c),
        **              0,
        */
        SCR_NO_OP,
                0,
        SCR_RETURN,
                0,
}/*-------------------------< MSG_IN >--------------------*/,{
        /*
        **      Get the first byte of the message.
        **
        **      The script processor doesn't negate the
        **      ACK signal after this transfer.
        */
        SCR_MOVE_ABS (1) ^ SCR_MSG_IN,
                NADDR (msgin[0]),
}/*-------------------------< MSG_IN2 >--------------------*/,{
        /*
        **      Check first against 1 byte messages 
        **      that we handle from SCRIPTS.
        */
        SCR_JUMP ^ IFTRUE (DATA (M_COMPLETE)),
                PADDR (complete),
        SCR_JUMP ^ IFTRUE (DATA (M_DISCONNECT)),
                PADDR (disconnect),
        SCR_JUMP ^ IFTRUE (DATA (M_SAVE_DP)),
                PADDR (save_dp),
        SCR_JUMP ^ IFTRUE (DATA (M_RESTORE_DP)),
                PADDR (restore_dp),
        /*
        **      We handle all other messages from the 
        **      C code, so no need to waste on-chip RAM 
        **      for those ones.
        */
        SCR_JUMP,
                PADDRH (msg_in_etc),

}/*-------------------------< STATUS >--------------------*/,{
        /*
        **      get the status
        */
        SCR_MOVE_ABS (1) ^ SCR_STATUS,
                NADDR (scratch),
#ifdef SCSI_NCR_IARB_SUPPORT
        /*
        **      If STATUS is not GOOD, clear IMMEDIATE ARBITRATION, 
        **      since we may have to tamper the start queue from 
        **      the C code.
        */
        SCR_JUMPR ^ IFTRUE (DATA (S_GOOD)),
                8,
        SCR_REG_REG (scntl1, SCR_AND, ~IARB),
                0,
#endif
        /*
        **      save status to scsi_status.
        **      mark as complete.
        */
        SCR_TO_REG (SS_REG),
                0,
        SCR_LOAD_REG (HS_REG, HS_COMPLETE),
                0,
        /*
        **      Anticipate the MESSAGE PHASE for 
        **      the TASK COMPLETE message.
        */
        SCR_JUMP ^ IFTRUE (WHEN (SCR_MSG_IN)),
                PADDR (msg_in),
        SCR_JUMP,
                PADDR (dispatch),

}/*-------------------------< COMPLETE >-----------------*/,{
        /*
        **      Complete message.
        **
        **      Copy the data pointer to LASTP in header.
        */
        SCR_STORE_REL (temp, 4),
                offsetof (struct ccb, phys.header.lastp),
        /*
        **      When we terminate the cycle by clearing ACK,
        **      the target may disconnect immediately.
        **
        **      We don't want to be told of an
        **      "unexpected disconnect",
        **      so we disable this feature.
        */
        SCR_REG_REG (scntl2, SCR_AND, 0x7f),
                0,
        /*
        **      Terminate cycle ...
        */
        SCR_CLR (SCR_ACK|SCR_ATN),
                0,
        /*
        **      ... and wait for the disconnect.
        */
        SCR_WAIT_DISC,
                0,
}/*-------------------------< COMPLETE2 >-----------------*/,{
        /*
        **      Save host status to header.
        */
        SCR_STORE_REL (scr0, 4),
                offsetof (struct ccb, phys.header.status),

#ifdef SCSI_NCR_PCIQ_MAY_REORDER_WRITES
        /*
        **      Some bridges may reorder DMA writes to memory.
        **      We donnot want the CPU to deal with completions  
        **      without all the posted write having been flushed 
        **      to memory. This DUMMY READ should flush posted 
        **      buffers prior to the CPU having to deal with 
        **      completions.
        */
        SCR_LOAD_REL (scr0, 4), /* DUMMY READ */
                offsetof (struct ccb, phys.header.status),
#endif
        /*
        **      If command resulted in not GOOD status,
        **      call the C code if needed.
        */
        SCR_FROM_REG (SS_REG),
                0,
        SCR_CALL ^ IFFALSE (DATA (S_GOOD)),
                PADDRH (bad_status),

        /*
        **      If we performed an auto-sense, call 
        **      the C code to synchronyze task aborts 
        **      with UNIT ATTENTION conditions.
        */
        SCR_FROM_REG (HF_REG),
                0,
        SCR_INT ^ IFTRUE (MASK (HF_AUTO_SENSE, HF_AUTO_SENSE)),
                SIR_AUTO_SENSE_DONE,

}/*------------------------< DONE >-----------------*/,{
#ifdef SCSI_NCR_PCIQ_SYNC_ON_INTR
        /*
        **      It seems that some bridges flush everything 
        **      when the INTR line is raised. For these ones, 
        **      we can just ensure that the INTR line will be 
        **      raised before each completion. So, if it happens 
        **      that we have been faster that the CPU, we just 
        **      have to synchronize with it. A dummy programmed 
        **      interrupt will do the trick.
        **      Note that we overlap at most 1 IO with the CPU 
        **      in this situation and that the IRQ line must not 
        **      be shared.
        */
        SCR_FROM_REG (istat),
                0,
        SCR_INT ^ IFTRUE (MASK (INTF, INTF)),
                SIR_DUMMY_INTERRUPT,
#endif
        /*
        **      Copy the DSA to the DONE QUEUE and 
        **      signal completion to the host.
        **      If we are interrupted between DONE 
        **      and DONE_END, we must reset, otherwise 
        **      the completed CCB will be lost.
        */
        SCR_STORE_ABS (dsa, 4),
                PADDRH (saved_dsa),
        SCR_LOAD_ABS (dsa, 4),
                PADDRH (done_pos),
        SCR_LOAD_ABS (scratcha, 4),
                PADDRH (saved_dsa),
        SCR_STORE_REL (scratcha, 4),
                0,
        /*
        **      The instruction below reads the DONE QUEUE next 
        **      free position from memory.
        **      In addition it ensures that all PCI posted writes  
        **      are flushed and so the DSA value of the done 
        **      CCB is visible by the CPU before INTFLY is raised.
        */
        SCR_LOAD_REL (temp, 4),
                4,
        SCR_INT_FLY,
                0,
        SCR_STORE_ABS (temp, 4),
                PADDRH (done_pos),
}/*------------------------< DONE_END >-----------------*/,{
        SCR_JUMP,
                PADDR (start),

}/*-------------------------< SAVE_DP >------------------*/,{
        /*
        **      Clear ACK immediately.
        **      No need to delay it.
        */
        SCR_CLR (SCR_ACK),
                0,
        /*
        **      Keep track we received a SAVE DP, so 
        **      we will switch to the other PM context 
        **      on the next PM since the DP may point 
        **      to the current PM context.
        */
        SCR_REG_REG (HF_REG, SCR_OR, HF_DP_SAVED),
                0,
        /*
        **      SAVE_DP message:
        **      Copy the data pointer to SAVEP in header.
        */
        SCR_STORE_REL (temp, 4),
                offsetof (struct ccb, phys.header.savep),
        SCR_JUMP,
                PADDR (dispatch),
}/*-------------------------< RESTORE_DP >---------------*/,{
        /*
        **      RESTORE_DP message:
        **      Copy SAVEP in header to actual data pointer.
        */
        SCR_LOAD_REL  (temp, 4),
                offsetof (struct ccb, phys.header.savep),
        SCR_JUMP,
                PADDR (clrack),

}/*-------------------------< DISCONNECT >---------------*/,{
        /*
        **      DISCONNECTing  ...
        **
        **      disable the "unexpected disconnect" feature,
        **      and remove the ACK signal.
        */
        SCR_REG_REG (scntl2, SCR_AND, 0x7f),
                0,
        SCR_CLR (SCR_ACK|SCR_ATN),
                0,
        /*
        **      Wait for the disconnect.
        */
        SCR_WAIT_DISC,
                0,
        /*
        **      Status is: DISCONNECTED.
        */
        SCR_LOAD_REG (HS_REG, HS_DISCONNECT),
                0,
        /*
        **      Save host status to header.
        */
        SCR_STORE_REL (scr0, 4),
                offsetof (struct ccb, phys.header.status),
        /*
        **      If QUIRK_AUTOSAVE is set,
        **      do an "save pointer" operation.
        */
        SCR_FROM_REG (QU_REG),
                0,
        SCR_JUMP ^ IFFALSE (MASK (QUIRK_AUTOSAVE, QUIRK_AUTOSAVE)),
                PADDR (start),
        /*
        **      like SAVE_DP message:
        **      Remember we saved the data pointer.
        **      Copy data pointer to SAVEP in header.
        */
        SCR_REG_REG (HF_REG, SCR_OR, HF_DP_SAVED),
                0,
        SCR_STORE_REL (temp, 4),
                offsetof (struct ccb, phys.header.savep),
        SCR_JUMP,
                PADDR (start),

}/*-------------------------< IDLE >------------------------*/,{
        /*
        **      Nothing to do?
        **      Wait for reselect.
        **      This NOP will be patched with LED OFF
        **      SCR_REG_REG (gpreg, SCR_OR, 0x01)
        */
        SCR_NO_OP,
                0,
#ifdef SCSI_NCR_IARB_SUPPORT
        SCR_JUMPR,
                8,
#endif
}/*-------------------------< UNGETJOB >-----------------*/,{
#ifdef SCSI_NCR_IARB_SUPPORT
        /*
        **      Set IMMEDIATE ARBITRATION, for the next time.
        **      This will give us better chance to win arbitration 
        **      for the job we just wanted to do.
        */
        SCR_REG_REG (scntl1, SCR_OR, IARB),
                0,
#endif
        /*
        **      We are not able to restart the SCRIPTS if we are 
        **      interrupted and these instruction haven't been 
        **      all executed. BTW, this is very unlikely to 
        **      happen, but we check that from the C code.
        */
        SCR_LOAD_REG (dsa, 0xff),
                0,
        SCR_STORE_ABS (scratcha, 4),
                PADDRH (startpos),
}/*-------------------------< RESELECT >--------------------*/,{
        /*
        **      make the host status invalid.
        */
        SCR_CLR (SCR_TRG),
                0,
        /*
        **      Sleep waiting for a reselection.
        **      If SIGP is set, special treatment.
        **
        **      Zu allem bereit ..
        */
        SCR_WAIT_RESEL,
                PADDR(start),
}/*-------------------------< RESELECTED >------------------*/,{
        /*
        **      This NOP will be patched with LED ON
        **      SCR_REG_REG (gpreg, SCR_AND, 0xfe)
        */
        SCR_NO_OP,
                0,
        /*
        **      load the target id into the sdid
        */
        SCR_REG_SFBR (ssid, SCR_AND, 0x8F),
                0,
        SCR_TO_REG (sdid),
                0,
        /*
        **      load the target control block address
        */
        SCR_LOAD_ABS (dsa, 4),
                PADDRH (targtbl),
        SCR_SFBR_REG (dsa, SCR_SHL, 0),
                0,
        SCR_REG_REG (dsa, SCR_SHL, 0),
                0,
        SCR_REG_REG (dsa, SCR_AND, 0x3c),
                0,
        SCR_LOAD_REL (dsa, 4),
                0,
        /*
        **      Load the synchronous transfer registers.
        */
        SCR_LOAD_REL (scntl3, 1),
                offsetof(struct tcb, wval),
        SCR_LOAD_REL (sxfer, 1),
                offsetof(struct tcb, sval),
}/*-------------------------< RESEL_SCNTL4 >------------------*/,{
        /*
        **      Write with uval value. Patch if device
        **      does not support Ultra3.
        **      
        **      SCR_LOAD_REL (scntl4, 1),
        **              offsetof(struct tcb, uval),
        */

        SCR_NO_OP,
                0,
        /*
         *  We expect MESSAGE IN phase.
         *  If not, get help from the C code.
         */
        SCR_INT ^ IFFALSE (WHEN (SCR_MSG_IN)),
                SIR_RESEL_NO_MSG_IN,
        SCR_MOVE_ABS (1) ^ SCR_MSG_IN,
                NADDR (msgin),

        /*
         *  If IDENTIFY LUN #0, use a faster path 
         *  to find the LCB structure.
         */
        SCR_JUMPR ^ IFTRUE (MASK (0x80, 0xbf)),
                56,
        /*
         *  If message isn't an IDENTIFY, 
         *  tell the C code about.
         */
        SCR_INT ^ IFFALSE (MASK (0x80, 0x80)),
                SIR_RESEL_NO_IDENTIFY,
        /*
         *  It is an IDENTIFY message,
         *  Load the LUN control block address.
         */
        SCR_LOAD_REL (dsa, 4),
                offsetof(struct tcb, b_luntbl),
        SCR_SFBR_REG (dsa, SCR_SHL, 0),
                0,
        SCR_REG_REG (dsa, SCR_SHL, 0),
                0,
        SCR_REG_REG (dsa, SCR_AND, 0xfc),
                0,
        SCR_LOAD_REL (dsa, 4),
                0,
        SCR_JUMPR,
                8,
        /*
        **      LUN 0 special case (but usual one :))
        */
        SCR_LOAD_REL (dsa, 4),
                offsetof(struct tcb, b_lun0),

        /*
        **      Load the reselect task action for this LUN.
        **      Load the tasks DSA array for this LUN.
        **      Call the action.
        */
        SCR_LOAD_REL (temp, 4),
                offsetof(struct lcb, resel_task),
        SCR_LOAD_REL (dsa, 4),
                offsetof(struct lcb, b_tasktbl),
        SCR_RETURN,
                0,
}/*-------------------------< RESEL_TAG >-------------------*/,{
        /*
        **      ACK the IDENTIFY or TAG previously received
        */

        SCR_CLR (SCR_ACK),
                0,
        /*
        **      Read IDENTIFY + SIMPLE + TAG using a single MOVE.
        **      Agressive optimization, is'nt it?
        **      No need to test the SIMPLE TAG message, since the 
        **      driver only supports conformant devices for tags. ;-)
        */
        SCR_MOVE_ABS (2) ^ SCR_MSG_IN,
                NADDR (msgin),
        /*
        **      Read the TAG from the SIDL.
        **      Still an aggressive optimization. ;-)
        **      Compute the CCB indirect jump address which 
        **      is (#TAG*2 & 0xfc) due to tag numbering using 
        **      1,3,5..MAXTAGS*2+1 actual values.
        */
        SCR_REG_SFBR (sidl, SCR_SHL, 0),
                0,
#if MAX_TASKS*4 > 512
        SCR_JUMPR ^ IFFALSE (CARRYSET),
                8,
        SCR_REG_REG (dsa1, SCR_OR, 2),
                0,
        SCR_REG_REG (sfbr, SCR_SHL, 0),
                0,
        SCR_JUMPR ^ IFFALSE (CARRYSET),
                8,
        SCR_REG_REG (dsa1, SCR_OR, 1),
                0,
#elif MAX_TASKS*4 > 256
        SCR_JUMPR ^ IFFALSE (CARRYSET),
                8,
        SCR_REG_REG (dsa1, SCR_OR, 1),
                0,
#endif
        /*
        **      Retrieve the DSA of this task.
        **      JUMP indirectly to the restart point of the CCB.
        */
        SCR_SFBR_REG (dsa, SCR_AND, 0xfc),
                0,
}/*-------------------------< RESEL_GO >-------------------*/,{
        SCR_LOAD_REL (dsa, 4),
                0,
        SCR_LOAD_REL (temp, 4),
                offsetof(struct ccb, phys.header.go.restart),
        SCR_RETURN,
                0,
        /* In normal situations we branch to RESEL_DSA */
}/*-------------------------< RESEL_NOTAG >-------------------*/,{
        /*
        **      JUMP indirectly to the restart point of the CCB.
        */
        SCR_JUMP,
                PADDR (resel_go),

}/*-------------------------< RESEL_DSA >-------------------*/,{
        /*
        **      Ack the IDENTIFY or TAG previously received.
        */
        SCR_CLR (SCR_ACK),
                0,
        /*
        **      load the savep (saved pointer) into
        **      the actual data pointer.
        */
        SCR_LOAD_REL (temp, 4),
                offsetof (struct ccb, phys.header.savep),
        /*
        **      Initialize the status registers
        */
        SCR_LOAD_REL (scr0, 4),
                offsetof (struct ccb, phys.header.status),
        /*
        **      Jump to dispatcher.
        */
        SCR_JUMP,
                PADDR (dispatch),

}/*-------------------------< DATA_IN >--------------------*/,{
/*
**      Because the size depends on the
**      #define MAX_SCATTER parameter,
**      it is filled in at runtime.
**
**  ##===========< i=0; i<MAX_SCATTER >=========
**  ||  SCR_CHMOV_TBL ^ SCR_DATA_IN,
**  ||          offsetof (struct dsb, data[ i]),
**  ##==========================================
**
**---------------------------------------------------------
*/
0
}/*-------------------------< DATA_IN2 >-------------------*/,{
        SCR_CALL,
                PADDR (datai_done),
        SCR_JUMP,
                PADDRH (data_ovrun),
}/*-------------------------< DATA_OUT >--------------------*/,{
/*
**      Because the size depends on the
**      #define MAX_SCATTER parameter,
**      it is filled in at runtime.
**
**  ##===========< i=0; i<MAX_SCATTER >=========
**  ||  SCR_CHMOV_TBL ^ SCR_DATA_OUT,
**  ||          offsetof (struct dsb, data[ i]),
**  ##==========================================
**
**---------------------------------------------------------
*/
0
}/*-------------------------< DATA_OUT2 >-------------------*/,{
        SCR_CALL,
                PADDR (datao_done),
        SCR_JUMP,
                PADDRH (data_ovrun),

}/*-------------------------< PM0_DATA >--------------------*/,{
        /*
        **      Read our host flags to SFBR, so we will be able 
        **      to check against the data direction we expect.
        */
        SCR_FROM_REG (HF_REG),
                0,
        /*
        **      Check against actual DATA PHASE.
        */
        SCR_JUMP ^ IFFALSE (WHEN (SCR_DATA_IN)),
                PADDR (pm0_data_out),
        /*
        **      Actual phase is DATA IN.
        **      Check against expected direction.
        */
        SCR_JUMP ^ IFFALSE (MASK (HF_DATA_IN, HF_DATA_IN)),
                PADDRH (data_ovrun),
        /*
        **      Keep track we are moving data from the 
        **      PM0 DATA mini-script.
        */
        SCR_REG_REG (HF_REG, SCR_OR, HF_IN_PM0),
                0,
        /*
        **      Move the data to memory.
        */
        SCR_CHMOV_TBL ^ SCR_DATA_IN,
                offsetof (struct ccb, phys.pm0.sg),
        SCR_JUMP,
                PADDR (pm0_data_end),
}/*-------------------------< PM0_DATA_OUT >----------------*/,{
        /*
        **      Actual phase is DATA OUT.
        **      Check against expected direction.
        */
        SCR_JUMP ^ IFTRUE (MASK (HF_DATA_IN, HF_DATA_IN)),
                PADDRH (data_ovrun),
        /*
        **      Keep track we are moving data from the 
        **      PM0 DATA mini-script.
        */
        SCR_REG_REG (HF_REG, SCR_OR, HF_IN_PM0),
                0,
        /*
        **      Move the data from memory.
        */
        SCR_CHMOV_TBL ^ SCR_DATA_OUT,
                offsetof (struct ccb, phys.pm0.sg),
}/*-------------------------< PM0_DATA_END >----------------*/,{
        /*
        **      Clear the flag that told we were moving  
        **      data from the PM0 DATA mini-script.
        */
        SCR_REG_REG (HF_REG, SCR_AND, (~HF_IN_PM0)),
                0,
        /*
        **      Return to the previous DATA script which 
        **      is guaranteed by design (if no bug) to be 
        **      the main DATA script for this transfer.
        */
        SCR_LOAD_REL (temp, 4),
                offsetof (struct ccb, phys.pm0.ret),
        SCR_RETURN,
                0,
}/*-------------------------< PM1_DATA >--------------------*/,{
        /*
        **      Read our host flags to SFBR, so we will be able 
        **      to check against the data direction we expect.
        */
        SCR_FROM_REG (HF_REG),
                0,
        /*
        **      Check against actual DATA PHASE.
        */
        SCR_JUMP ^ IFFALSE (WHEN (SCR_DATA_IN)),
                PADDR (pm1_data_out),
        /*
        **      Actual phase is DATA IN.
        **      Check against expected direction.
        */
        SCR_JUMP ^ IFFALSE (MASK (HF_DATA_IN, HF_DATA_IN)),
                PADDRH (data_ovrun),
        /*
        **      Keep track we are moving data from the 
        **      PM1 DATA mini-script.
        */
        SCR_REG_REG (HF_REG, SCR_OR, HF_IN_PM1),
                0,
        /*
        **      Move the data to memory.
        */
        SCR_CHMOV_TBL ^ SCR_DATA_IN,
                offsetof (struct ccb, phys.pm1.sg),
        SCR_JUMP,
                PADDR (pm1_data_end),
}/*-------------------------< PM1_DATA_OUT >----------------*/,{
        /*
        **      Actual phase is DATA OUT.
        **      Check against expected direction.
        */
        SCR_JUMP ^ IFTRUE (MASK (HF_DATA_IN, HF_DATA_IN)),
                PADDRH (data_ovrun),
        /*
        **      Keep track we are moving data from the 
        **      PM1 DATA mini-script.
        */
        SCR_REG_REG (HF_REG, SCR_OR, HF_IN_PM1),
                0,
        /*
        **      Move the data from memory.
        */
        SCR_CHMOV_TBL ^ SCR_DATA_OUT,
                offsetof (struct ccb, phys.pm1.sg),
}/*-------------------------< PM1_DATA_END >----------------*/,{
        /*
        **      Clear the flag that told we were moving  
        **      data from the PM1 DATA mini-script.
        */
        SCR_REG_REG (HF_REG, SCR_AND, (~HF_IN_PM1)),
                0,
        /*
        **      Return to the previous DATA script which 
        **      is guaranteed by design (if no bug) to be 
        **      the main DATA script for this transfer.
        */
        SCR_LOAD_REL (temp, 4),
                offsetof (struct ccb, phys.pm1.ret),
        SCR_RETURN,
                0,
}/*---------------------------------------------------------*/
};


static  struct scripth scripth0 __initdata = {
/*------------------------< START64 >-----------------------*/{
        /*
        **      SCRIPT entry point for the 895A and the 896.
        **      For now, there is no specific stuff for that 
        **      chip at this point, but this may come.
        */
        SCR_JUMP,
                PADDR (init),
}/*-------------------------< NO_DATA >-------------------*/,{
        SCR_JUMP,
                PADDRH (data_ovrun),
}/*-----------------------< SEL_FOR_ABORT >------------------*/,{
        /*
        **      We are jumped here by the C code, if we have 
        **      some target to reset or some disconnected 
        **      job to abort. Since error recovery is a serious 
        **      busyness, we will really reset the SCSI BUS, if 
        **      case of a SCSI interrupt occurring in this path.
        */

        /*
        **      Set initiator mode.
        */
        SCR_CLR (SCR_TRG),
                0,
        /*
        **      And try to select this target.
        */
        SCR_SEL_TBL_ATN ^ offsetof (struct ncb, abrt_sel),
                PADDR (reselect),

        /*
        **      Wait for the selection to complete or 
        **      the selection to time out.
        */
        SCR_JUMPR ^ IFFALSE (WHEN (SCR_MSG_OUT)),
                -8,
        /*
        **      Call the C code.
        */
        SCR_INT,
                SIR_TARGET_SELECTED,
        /*
        **      The C code should let us continue here. 
        **      Send the 'kiss of death' message.
        **      We expect an immediate disconnect once 
        **      the target has eaten the message.
        */
        SCR_REG_REG (scntl2, SCR_AND, 0x7f),
                0,
        SCR_MOVE_TBL ^ SCR_MSG_OUT,
                offsetof (struct ncb, abrt_tbl),
        SCR_CLR (SCR_ACK|SCR_ATN),
                0,
        SCR_WAIT_DISC,
                0,
        /*
        **      Tell the C code that we are done.
        */
        SCR_INT,
                SIR_ABORT_SENT,
}/*-----------------------< SEL_FOR_ABORT_1 >--------------*/,{
        /*
        **      Jump at scheduler.
        */
        SCR_JUMP,
                PADDR (start),

}/*------------------------< SELECT_NO_ATN >-----------------*/,{
        /*
        **      Set Initiator mode.
        **      And try to select this target without ATN.
        */

        SCR_CLR (SCR_TRG),
                0,
        SCR_SEL_TBL ^ offsetof (struct dsb, select),
                PADDR (ungetjob),
        /*
        **      load the savep (saved pointer) into
        **      the actual data pointer.
        */
        SCR_LOAD_REL (temp, 4),
                offsetof (struct ccb, phys.header.savep),
        /*
        **      Initialize the status registers
        */
        SCR_LOAD_REL (scr0, 4),
                offsetof (struct ccb, phys.header.status),

}/*------------------------< WF_SEL_DONE_NO_ATN >-----------------*/,{
        /*
        **      Wait immediately for the next phase or 
        **      the selection to complete or time-out.
        */
        SCR_JUMPR ^ IFFALSE (WHEN (SCR_MSG_OUT)),
                0,
        SCR_JUMP,
                PADDR (select2),

}/*-------------------------< MSG_IN_ETC >--------------------*/,{
        /*
        **      If it is an EXTENDED (variable size message)
        **      Handle it.
        */
        SCR_JUMP ^ IFTRUE (DATA (M_EXTENDED)),
                PADDRH (msg_extended),
        /*
        **      Let the C code handle any other 
        **      1 byte message.
        */
        SCR_JUMP ^ IFTRUE (MASK (0x00, 0xf0)),
                PADDRH (msg_received),
        SCR_JUMP ^ IFTRUE (MASK (0x10, 0xf0)),
                PADDRH (msg_received),
        /*
        **      We donnot handle 2 bytes messages from SCRIPTS.
        **      So, let the C code deal with these ones too.
        */
        SCR_JUMP ^ IFFALSE (MASK (0x20, 0xf0)),
                PADDRH (msg_weird_seen),
        SCR_CLR (SCR_ACK),
                0,
        SCR_MOVE_ABS (1) ^ SCR_MSG_IN,
                NADDR (msgin[1]),
        SCR_JUMP,
                PADDRH (msg_received),

}/*-------------------------< MSG_RECEIVED >--------------------*/,{
        SCR_LOAD_REL (scratcha, 4),     /* DUMMY READ */
                0,
        SCR_INT,
                SIR_MSG_RECEIVED,

}/*-------------------------< MSG_WEIRD_SEEN >------------------*/,{
        SCR_LOAD_REL (scratcha, 4),     /* DUMMY READ */
                0,
        SCR_INT,
                SIR_MSG_WEIRD,

}/*-------------------------< MSG_EXTENDED >--------------------*/,{
        /*
        **      Clear ACK and get the next byte 
        **      assumed to be the message length.
        */
        SCR_CLR (SCR_ACK),
                0,
        SCR_MOVE_ABS (1) ^ SCR_MSG_IN,
                NADDR (msgin[1]),
        /*
        **      Try to catch some unlikely situations as 0 length 
        **      or too large the length.
        */
        SCR_JUMP ^ IFTRUE (DATA (0)),
                PADDRH (msg_weird_seen),
        SCR_TO_REG (scratcha),
                0,
        SCR_REG_REG (sfbr, SCR_ADD, (256-8)),
                0,
        SCR_JUMP ^ IFTRUE (CARRYSET),
                PADDRH (msg_weird_seen),
        /*
        **      We donnot handle extended messages from SCRIPTS.
        **      Read the amount of data correponding to the 
        **      message length and call the C code.
        */
        SCR_STORE_REL (scratcha, 1),
                offsetof (struct dsb, smsg_ext.size),
        SCR_CLR (SCR_ACK),
                0,
        SCR_MOVE_TBL ^ SCR_MSG_IN,
                offsetof (struct dsb, smsg_ext),
        SCR_JUMP,
                PADDRH (msg_received),

}/*-------------------------< MSG_BAD >------------------*/,{
        /*
        **      unimplemented message - reject it.
        */
        SCR_INT,
                SIR_REJECT_TO_SEND,
        SCR_SET (SCR_ATN),
                0,
        SCR_JUMP,
                PADDR (clrack),

}/*-------------------------< MSG_WEIRD >--------------------*/,{
        /*
        **      weird message received
        **      ignore all MSG IN phases and reject it.
        */
        SCR_INT,
                SIR_REJECT_TO_SEND,
        SCR_SET (SCR_ATN),
                0,
}/*-------------------------< MSG_WEIRD1 >--------------------*/,{
        SCR_CLR (SCR_ACK),
                0,
        SCR_JUMP ^ IFFALSE (WHEN (SCR_MSG_IN)),
                PADDR (dispatch),
        SCR_MOVE_ABS (1) ^ SCR_MSG_IN,
                NADDR (scratch),
        SCR_JUMP,
                PADDRH (msg_weird1),
}/*-------------------------< WDTR_RESP >----------------*/,{
        /*
        **      let the target fetch our answer.
        */
        SCR_SET (SCR_ATN),
                0,
        SCR_CLR (SCR_ACK),
                0,
        SCR_JUMP ^ IFFALSE (WHEN (SCR_MSG_OUT)),
                PADDRH (nego_bad_phase),

}/*-------------------------< SEND_WDTR >----------------*/,{
        /*
        **      Send the M_X_WIDE_REQ
        */
        SCR_MOVE_ABS (4) ^ SCR_MSG_OUT,
                NADDR (msgout),
        SCR_JUMP,
                PADDRH (msg_out_done),

}/*-------------------------< SDTR_RESP >-------------*/,{
        /*
        **      let the target fetch our answer.
        */
        SCR_SET (SCR_ATN),
                0,
        SCR_CLR (SCR_ACK),
                0,
        SCR_JUMP ^ IFFALSE (WHEN (SCR_MSG_OUT)),
                PADDRH (nego_bad_phase),

}/*-------------------------< SEND_SDTR >-------------*/,{
        /*
        **      Send the M_X_SYNC_REQ
        */
        SCR_MOVE_ABS (5) ^ SCR_MSG_OUT,
                NADDR (msgout),
        SCR_JUMP,
                PADDRH (msg_out_done),

}/*-------------------------< PPR_RESP >-------------*/,{
        /*
        **      let the target fetch our answer.
        */
        SCR_SET (SCR_ATN),
                0,
        SCR_CLR (SCR_ACK),
                0,
        SCR_JUMP ^ IFFALSE (WHEN (SCR_MSG_OUT)),
                PADDRH (nego_bad_phase),

}/*-------------------------< SEND_PPR >-------------*/,{
        /*
        **      Send the M_X_PPR_REQ
        */
        SCR_MOVE_ABS (8) ^ SCR_MSG_OUT,
                NADDR (msgout),
        SCR_JUMP,
                PADDRH (msg_out_done),

}/*-------------------------< NEGO_BAD_PHASE >------------*/,{
        SCR_INT,
                SIR_NEGO_PROTO,
        SCR_JUMP,
                PADDR (dispatch),

}/*-------------------------< MSG_OUT >-------------------*/,{
        /*
        **      The target requests a message.
        */
        SCR_MOVE_ABS (1) ^ SCR_MSG_OUT,
                NADDR (msgout),
        /*
        **      ... wait for the next phase
        **      if it's a message out, send it again, ...
        */
        SCR_JUMP ^ IFTRUE (WHEN (SCR_MSG_OUT)),
                PADDRH (msg_out),
}/*-------------------------< MSG_OUT_DONE >--------------*/,{
        /*
        **      ... else clear the message ...
        */
        SCR_INT,
                SIR_MSG_OUT_DONE,
        /*
        **      ... and process the next phase
        */
        SCR_JUMP,
                PADDR (dispatch),

}/*-------------------------< DATA_OVRUN >-----------------------*/,{
        /*
         *  Use scratcha to count the extra bytes.
         */
        SCR_LOAD_ABS (scratcha, 4),
                PADDRH (zero),
}/*-------------------------< DATA_OVRUN1 >----------------------*/,{
        /*
         *  The target may want to transfer too much data.
         *
         *  If phase is DATA OUT write 1 byte and count it.
         */
        SCR_JUMPR ^ IFFALSE (WHEN (SCR_DATA_OUT)),
                16,
        SCR_CHMOV_ABS (1) ^ SCR_DATA_OUT,
                NADDR (scratch),
        SCR_JUMP,
                PADDRH (data_ovrun2),
        /*
         *  If WSR is set, clear this condition, and 
         *  count this byte.
         */
        SCR_FROM_REG (scntl2),
                0,
        SCR_JUMPR ^ IFFALSE (MASK (WSR, WSR)),
                16,
        SCR_REG_REG (scntl2, SCR_OR, WSR),
                0,
        SCR_JUMP,
                PADDRH (data_ovrun2),
        /*
         *  Finally check against DATA IN phase.
         *  Signal data overrun to the C code 
         *  and jump to dispatcher if not so.
         *  Read 1 byte otherwise and count it.
         */
        SCR_JUMPR ^ IFTRUE (WHEN (SCR_DATA_IN)),
                16,
        SCR_INT,
                SIR_DATA_OVERRUN,
        SCR_JUMP,
                PADDR (dispatch),
        SCR_CHMOV_ABS (1) ^ SCR_DATA_IN,
                NADDR (scratch),
}/*-------------------------< DATA_OVRUN2 >----------------------*/,{
        /*
         *  Count this byte.
         *  This will allow to return a negative 
         *  residual to user.
         */
        SCR_REG_REG (scratcha,  SCR_ADD,  0x01),
                0,
        SCR_REG_REG (scratcha1, SCR_ADDC, 0),
                0,
        SCR_REG_REG (scratcha2, SCR_ADDC, 0),
                0,
        /*
         *  .. and repeat as required.
         */
        SCR_JUMP,
                PADDRH (data_ovrun1),

}/*-------------------------< ABORT_RESEL >----------------*/,{
        SCR_SET (SCR_ATN),
                0,
        SCR_CLR (SCR_ACK),
                0,
        /*
        **      send the abort/abortag/reset message
        **      we expect an immediate disconnect
        */
        SCR_REG_REG (scntl2, SCR_AND, 0x7f),
                0,
        SCR_MOVE_ABS (1) ^ SCR_MSG_OUT,
                NADDR (msgout),
        SCR_CLR (SCR_ACK|SCR_ATN),
                0,
        SCR_WAIT_DISC,
                0,
        SCR_INT,
                SIR_RESEL_ABORTED,
        SCR_JUMP,
                PADDR (start),
}/*-------------------------< RESEND_IDENT >-------------------*/,{
        /*
        **      The target stays in MSG OUT phase after having acked 
        **      Identify [+ Tag [+ Extended message ]]. Targets shall
        **      behave this way on parity error.
        **      We must send it again all the messages.
        */
        SCR_SET (SCR_ATN), /* Shall be asserted 2 deskew delays before the  */
                0,         /* 1rst ACK = 90 ns. Hope the NCR is'nt too fast */
        SCR_JUMP,
                PADDR (send_ident),
}/*-------------------------< IDENT_BREAK >-------------------*/,{
        SCR_CLR (SCR_ATN),
                0,
        SCR_JUMP,
                PADDR (select2),
}/*-------------------------< IDENT_BREAK_ATN >----------------*/,{
        SCR_SET (SCR_ATN),
                0,
        SCR_JUMP,
                PADDR (select2),
}/*-------------------------< SDATA_IN >-------------------*/,{
        SCR_CHMOV_TBL ^ SCR_DATA_IN,
                offsetof (struct dsb, sense),
        SCR_CALL,
                PADDR (datai_done),
        SCR_JUMP,
                PADDRH (data_ovrun),
}/*-------------------------< DATA_IO >--------------------*/,{
        /*
        **      We jump here if the data direction was unknown at the 
        **      time we had to queue the command to the scripts processor.
        **      Pointers had been set as follow in this situation:
        **        savep   -->   DATA_IO
        **        lastp   -->   start pointer when DATA_IN
        **        goalp   -->   goal  pointer when DATA_IN
        **        wlastp  -->   start pointer when DATA_OUT
        **        wgoalp  -->   goal  pointer when DATA_OUT
        **      This script sets savep/lastp/goalp according to the 
        **      direction chosen by the target.
        */
        SCR_JUMP ^ IFTRUE (WHEN (SCR_DATA_OUT)),
                PADDRH(data_io_out),
}/*-------------------------< DATA_IO_COM >-----------------*/,{
        /*
        **      Direction is DATA IN.
        **      Warning: we jump here, even when phase is DATA OUT.
        */
        SCR_LOAD_REL  (scratcha, 4),
                offsetof (struct ccb, phys.header.lastp),
        SCR_STORE_REL (scratcha, 4),
                offsetof (struct ccb, phys.header.savep),

        /*
        **      Jump to the SCRIPTS according to actual direction.
        */
        SCR_LOAD_REL  (temp, 4),
                offsetof (struct ccb, phys.header.savep),
        SCR_RETURN,
                0,
}/*-------------------------< DATA_IO_OUT >-----------------*/,{
        /*
        **      Direction is DATA OUT.
        */
        SCR_REG_REG (HF_REG, SCR_AND, (~HF_DATA_IN)),
                0,
        SCR_LOAD_REL  (scratcha, 4),
                offsetof (struct ccb, phys.header.wlastp),
        SCR_STORE_REL (scratcha, 4),
                offsetof (struct ccb, phys.header.lastp),
        SCR_LOAD_REL  (scratcha, 4),
                offsetof (struct ccb, phys.header.wgoalp),
        SCR_STORE_REL (scratcha, 4),
                offsetof (struct ccb, phys.header.goalp),
        SCR_JUMP,
                PADDRH(data_io_com),

}/*-------------------------< RESEL_BAD_LUN >---------------*/,{
        /*
        **      Message is an IDENTIFY, but lun is unknown.
        **      Signal problem to C code for logging the event.
        **      Send a M_ABORT to clear all pending tasks.
        */
        SCR_INT,
                SIR_RESEL_BAD_LUN,
        SCR_JUMP,
                PADDRH (abort_resel),
}/*-------------------------< BAD_I_T_L >------------------*/,{
        /*
        **      We donnot have a task for that I_T_L.
        **      Signal problem to C code for logging the event.
        **      Send a M_ABORT message.
        */
        SCR_INT,
                SIR_RESEL_BAD_I_T_L,
        SCR_JUMP,
                PADDRH (abort_resel),
}/*-------------------------< BAD_I_T_L_Q >----------------*/,{
        /*
        **      We donnot have a task that matches the tag.
        **      Signal problem to C code for logging the event.
        **      Send a M_ABORTTAG message.
        */
        SCR_INT,
                SIR_RESEL_BAD_I_T_L_Q,
        SCR_JUMP,
                PADDRH (abort_resel),
}/*-------------------------< BAD_STATUS >-----------------*/,{
        /*
        **      Anything different from INTERMEDIATE 
        **      CONDITION MET should be a bad SCSI status, 
        **      given that GOOD status has already been tested.
        **      Call the C code.
        */
        SCR_LOAD_ABS (scratcha, 4),
                PADDRH (startpos),
        SCR_INT ^ IFFALSE (DATA (S_COND_MET)),
                SIR_BAD_STATUS,
        SCR_RETURN,
                0,

}/*-------------------------< TWEAK_PMJ >------------------*/,{
        /*
        **      Disable PM handling from SCRIPTS for the data phase 
        **      and so force PM to be handled from C code if HF_PM_TO_C 
        **      flag is set.
        */
        SCR_FROM_REG(HF_REG),
                0,
        SCR_JUMPR ^ IFTRUE (MASK (HF_PM_TO_C, HF_PM_TO_C)),
                16,
        SCR_REG_REG (ccntl0, SCR_OR, ENPMJ),
                0,
        SCR_RETURN,
                0,
        SCR_REG_REG (ccntl0, SCR_AND, (~ENPMJ)),
                0,
        SCR_RETURN,
                0,

}/*-------------------------< PM_HANDLE >------------------*/,{
        /*
        **      Phase mismatch handling.
        **
        **      Since we have to deal with 2 SCSI data pointers  
        **      (current and saved), we need at least 2 contexts.
        **      Each context (pm0 and pm1) has a saved area, a 
        **      SAVE mini-script and a DATA phase mini-script.
        */
        /*
        **      Get the PM handling flags.
        */
        SCR_FROM_REG (HF_REG),
                0,
        /*
        **      If no flags (1rst PM for example), avoid 
        **      all the below heavy flags testing.
        **      This makes the normal case a bit faster.
        */
        SCR_JUMP ^ IFTRUE (MASK (0, (HF_IN_PM0 | HF_IN_PM1 | HF_DP_SAVED))),
                PADDRH (pm_handle1),
        /*
        **      If we received a SAVE DP, switch to the 
        **      other PM context since the savep may point 
        **      to the current PM context.
        */
        SCR_JUMPR ^ IFFALSE (MASK (HF_DP_SAVED, HF_DP_SAVED)),
                8,
        SCR_REG_REG (sfbr, SCR_XOR, HF_ACT_PM),
                0,
        /*
        **      If we have been interrupt in a PM DATA mini-script,
        **      we take the return address from the corresponding 
        **      saved area.
        **      This ensure the return address always points to the 
        **      main DATA script for this transfer.
        */
        SCR_JUMP ^ IFTRUE (MASK (0, (HF_IN_PM0 | HF_IN_PM1))),
                PADDRH (pm_handle1),
        SCR_JUMPR ^ IFFALSE (MASK (HF_IN_PM0, HF_IN_PM0)),
                16,
        SCR_LOAD_REL (ia, 4),
                offsetof(struct ccb, phys.pm0.ret),
        SCR_JUMP,
                PADDRH (pm_save),
        SCR_LOAD_REL (ia, 4),
                offsetof(struct ccb, phys.pm1.ret),
        SCR_JUMP,
                PADDRH (pm_save),
}/*-------------------------< PM_HANDLE1 >-----------------*/,{
        /*
        **      Normal case.
        **      Update the return address so that it 
        **      will point after the interrupted MOVE.
        */
        SCR_REG_REG (ia, SCR_ADD, 8),
                0,
        SCR_REG_REG (ia1, SCR_ADDC, 0),
                0,
}/*-------------------------< PM_SAVE >--------------------*/,{
        /*
        **      Clear all the flags that told us if we were 
        **      interrupted in a PM DATA mini-script and/or 
        **      we received a SAVE DP.
        */
        SCR_SFBR_REG (HF_REG, SCR_AND, (~(HF_IN_PM0|HF_IN_PM1|HF_DP_SAVED))),
                0,
        /*
        **      Choose the current PM context.
        */
        SCR_JUMP ^ IFTRUE (MASK (HF_ACT_PM, HF_ACT_PM)),
                PADDRH (pm1_save),
}/*-------------------------< PM0_SAVE >-------------------*/,{
        SCR_STORE_REL (ia, 4),
                offsetof(struct ccb, phys.pm0.ret),
        /*
        **      If WSR bit is set, either UA and RBC may 
        **      have to be changed whatever the device wants 
        **      to ignore this residue ot not.
        */
        SCR_FROM_REG (scntl2),
                0,
        SCR_CALL ^ IFTRUE (MASK (WSR, WSR)),
                PADDRH (pm_wsr_handle),
        /*
        **      Save the remaining byte count, the updated 
        **      address and the return address.
        */
        SCR_STORE_REL (rbc, 4),
                offsetof(struct ccb, phys.pm0.sg.size),
        SCR_STORE_REL (ua, 4),
                offsetof(struct ccb, phys.pm0.sg.addr),
        /*
        **      Set the current pointer at the PM0 DATA mini-script.
        */
        SCR_LOAD_ABS (temp, 4),
                PADDRH (pm0_data_addr),
        SCR_JUMP,
                PADDR (dispatch),
}/*-------------------------< PM1_SAVE >-------------------*/,{
        SCR_STORE_REL (ia, 4),
                offsetof(struct ccb, phys.pm1.ret),
        /*
        **      If WSR bit is set, either UA and RBC may 
        **      have been changed whatever the device wants 
        **      to ignore this residue or not.
        */
        SCR_FROM_REG (scntl2),
                0,
        SCR_CALL ^ IFTRUE (MASK (WSR, WSR)),
                PADDRH (pm_wsr_handle),
        /*
        **      Save the remaining byte count, the updated 
        **      address and the return address.
        */
        SCR_STORE_REL (rbc, 4),
                offsetof(struct ccb, phys.pm1.sg.size),
        SCR_STORE_REL (ua, 4),
                offsetof(struct ccb, phys.pm1.sg.addr),
        /*
        **      Set the current pointer at the PM1 DATA mini-script.
        */
        SCR_LOAD_ABS (temp, 4),
                PADDRH (pm1_data_addr),
        SCR_JUMP,
                PADDR (dispatch),
}/*--------------------------< PM_WSR_HANDLE >-----------------------*/,{
        /*
         *  Phase mismatch handling from SCRIPT with WSR set.
         *  Such a condition can occur if the chip wants to 
         *  execute a CHMOV(size > 1) when the WSR bit is 
         *  set and the target changes PHASE.
         */
#ifdef  SYM_DEBUG_PM_WITH_WSR
        /*
         *  Some debugging may still be needed.:)
         */ 
        SCR_INT,
                SIR_PM_WITH_WSR,
#endif
        /*
         *  We must move the residual byte to memory.
         *
         *  UA contains bit 0..31 of the address to 
         *  move the residual byte.
         *  Move it to the table indirect.
         */
        SCR_STORE_REL (ua, 4),
                offsetof (struct ccb, phys.wresid.addr),
        /*
         *  Increment UA (move address to next position).
         */
        SCR_REG_REG (ua, SCR_ADD, 1),
                0,
        SCR_REG_REG (ua1, SCR_ADDC, 0),
                0,
        SCR_REG_REG (ua2, SCR_ADDC, 0),
                0,
        SCR_REG_REG (ua3, SCR_ADDC, 0),
                0,
        /*
         *  Compute SCRATCHA as:
         *  - size to transfer = 1 byte.
         *  - bit 24..31 = high address bit [32...39].
         */
        SCR_LOAD_ABS (scratcha, 4),
                PADDRH (zero),
        SCR_REG_REG (scratcha, SCR_OR, 1),
                0,
        SCR_FROM_REG (rbc3),
                0,
        SCR_TO_REG (scratcha3),
                0,
        /*
         *  Move this value to the table indirect.
         */
        SCR_STORE_REL (scratcha, 4),
                offsetof (struct ccb, phys.wresid.size),
        /*
         *  Wait for a valid phase.
         *  While testing with bogus QUANTUM drives, the C1010 
         *  sometimes raised a spurious phase mismatch with 
         *  WSR and the CHMOV(1) triggered another PM.
         *  Waiting explicitely for the PHASE seemed to avoid 
         *  the nested phase mismatch. Btw, this didn't happen 
         *  using my IBM drives.
         */
        SCR_JUMPR ^ IFFALSE (WHEN (SCR_DATA_IN)),
                0,
        /*
         *  Perform the move of the residual byte.
         */
        SCR_CHMOV_TBL ^ SCR_DATA_IN,
                offsetof (struct ccb, phys.wresid),
        /*
         *  We can now handle the phase mismatch with UA fixed.
         *  RBC[0..23]=0 is a special case that does not require 
         *  a PM context. The C code also checks against this.
         */
        SCR_FROM_REG (rbc),
                0,
        SCR_RETURN ^ IFFALSE (DATA (0)),
                0,
        SCR_FROM_REG (rbc1),
                0,
        SCR_RETURN ^ IFFALSE (DATA (0)),
                0,
        SCR_FROM_REG (rbc2),
                0,
        SCR_RETURN ^ IFFALSE (DATA (0)),
                0,
        /*
         *  RBC[0..23]=0.
         *  Not only we donnot need a PM context, but this would 
         *  lead to a bogus CHMOV(0). This condition means that 
         *  the residual was the last byte to move from this CHMOV.
         *  So, we just have to move the current data script pointer 
         *  (i.e. TEMP) to the SCRIPTS address following the 
         *  interrupted CHMOV and jump to dispatcher.
         */
        SCR_STORE_ABS (ia, 4),
                PADDRH (scratch),
        SCR_LOAD_ABS (temp, 4),
                PADDRH (scratch),
        SCR_JUMP,
                PADDR (dispatch),
}/*--------------------------< WSR_MA_HELPER >-----------------------*/,{
        /*
         *  Helper for the C code when WSR bit is set.
         *  Perform the move of the residual byte.
         */
        SCR_CHMOV_TBL ^ SCR_DATA_IN,
                offsetof (struct ccb, phys.wresid),
        SCR_JUMP,
                PADDR (dispatch),
}/*-------------------------< ZERO >------------------------*/,{
        SCR_DATA_ZERO,
}/*-------------------------< SCRATCH >---------------------*/,{
        SCR_DATA_ZERO,
}/*-------------------------< SCRATCH1 >--------------------*/,{
        SCR_DATA_ZERO,
}/*-------------------------< PM0_DATA_ADDR >---------------*/,{
        SCR_DATA_ZERO,
}/*-------------------------< PM1_DATA_ADDR >---------------*/,{
        SCR_DATA_ZERO,
}/*-------------------------< SAVED_DSA >-------------------*/,{
        SCR_DATA_ZERO,
}/*-------------------------< SAVED_DRS >-------------------*/,{
        SCR_DATA_ZERO,
}/*-------------------------< DONE_POS >--------------------*/,{
        SCR_DATA_ZERO,
}/*-------------------------< STARTPOS >--------------------*/,{
        SCR_DATA_ZERO,
}/*-------------------------< TARGTBL >---------------------*/,{
        SCR_DATA_ZERO,


/*
** We may use MEMORY MOVE instructions to load the on chip-RAM,
** if it happens that mapping PCI memory is not possible.
** But writing the RAM from the CPU is the preferred method, 
** since PCI 2.2 seems to disallow PCI self-mastering.
*/

#ifdef SCSI_NCR_PCI_MEM_NOT_SUPPORTED

}/*-------------------------< START_RAM >-------------------*/,{
        /*
        **      Load the script into on-chip RAM, 
        **      and jump to start point.
        */
        SCR_COPY (sizeof (struct script)),
}/*-------------------------< SCRIPT0_BA >--------------------*/,{
                0,
                PADDR (start),
        SCR_JUMP,
                PADDR (init),

}/*-------------------------< START_RAM64 >--------------------*/,{
        /*
        **      Load the RAM and start for 64 bit PCI (895A,896).
        **      Both scripts (script and scripth) are loaded into 
        **      the RAM which is 8K (4K for 825A/875/895).
        **      We also need to load some 32-63 bit segments 
        **      address of the SCRIPTS processor.
        **      LOAD/STORE ABSOLUTE always refers to on-chip RAM 
        **      in our implementation. The main memory is 
        **      accessed using LOAD/STORE DSA RELATIVE.
        */
        SCR_LOAD_REL (mmws, 4),
                offsetof (struct ncb, scr_ram_seg),
        SCR_COPY (sizeof(struct script)),
}/*-------------------------< SCRIPT0_BA64 >--------------------*/,{
                0,
                PADDR (start),
        SCR_COPY (sizeof(struct scripth)),
}/*-------------------------< SCRIPTH0_BA64 >--------------------*/,{
                0,
                PADDRH  (start64),
        SCR_LOAD_REL  (mmrs, 4),
                offsetof (struct ncb, scr_ram_seg),
        SCR_JUMP64,
                PADDRH (start64),
}/*-------------------------< RAM_SEG64 >--------------------*/,{
                0,

#endif /* SCSI_NCR_PCI_MEM_NOT_SUPPORTED */

}/*-------------------------< SNOOPTEST >-------------------*/,{
        /*
        **      Read the variable.
        */
        SCR_LOAD_REL (scratcha, 4),
                offsetof(struct ncb, ncr_cache),
        SCR_STORE_REL (temp, 4),
                offsetof(struct ncb, ncr_cache),
        SCR_LOAD_REL (temp, 4),
                offsetof(struct ncb, ncr_cache),
}/*-------------------------< SNOOPEND >-------------------*/,{
        /*
        **      And stop.
        */
        SCR_INT,
                99,
}/*--------------------------------------------------------*/
};

/*==========================================================
**
**
**      Fill in #define dependent parts of the script
**
**
**==========================================================
*/

void __init ncr_script_fill (struct script * scr, struct scripth * scrh)
{
        int     i;
        ncrcmd  *p;

        p = scr->data_in;
        for (i=0; i<MAX_SCATTER; i++) {
                *p++ =SCR_CHMOV_TBL ^ SCR_DATA_IN;
                *p++ =offsetof (struct dsb, data[i]);
        };

        assert ((u_long)p == (u_long)&scr->data_in + sizeof (scr->data_in));

        p = scr->data_out;

        for (i=0; i<MAX_SCATTER; i++) {
                *p++ =SCR_CHMOV_TBL ^ SCR_DATA_OUT;
                *p++ =offsetof (struct dsb, data[i]);
        };

        assert ((u_long)p == (u_long)&scr->data_out + sizeof (scr->data_out));
}

/*==========================================================
**
**
**      Copy and rebind a script.
**
**
**==========================================================
*/

static void __init 
ncr_script_copy_and_bind (ncb_p np,ncrcmd *src,ncrcmd *dst,int len)
{
        ncrcmd  opcode, new, old, tmp1, tmp2;
        ncrcmd  *start, *end;
        int relocs;
        int opchanged = 0;

        start = src;
        end = src + len/4;

        while (src < end) {

                opcode = *src++;
                *dst++ = cpu_to_scr(opcode);

                /*
                **      If we forget to change the length
                **      in struct script, a field will be
                **      padded with 0. This is an illegal
                **      command.
                */

                if (opcode == 0) {
                        printk (KERN_INFO "%s: ERROR0 IN SCRIPT at %d.\n",
                                ncr_name(np), (int) (src-start-1));
                        MDELAY (10000);
                        continue;
                };

                /*
                **      We use the bogus value 0xf00ff00f ;-)
                **      to reserve data area in SCRIPTS.
                */
                if (opcode == SCR_DATA_ZERO) {
                        dst[-1] = 0;
                        continue;
                }

                if (DEBUG_FLAGS & DEBUG_SCRIPT)
                        printk (KERN_INFO "%p:  <%x>\n",
                                (src-1), (unsigned)opcode);

                /*
                **      We don't have to decode ALL commands
                */
                switch (opcode >> 28) {

                case 0xf:
                        /*
                        **      LOAD / STORE DSA relative, don't relocate.
                        */
                        relocs = 0;
                        break;
                case 0xe:
                        /*
                        **      LOAD / STORE absolute.
                        */
                        relocs = 1;
                        break;
                case 0xc:
                        /*
                        **      COPY has TWO arguments.
                        */
                        relocs = 2;
                        tmp1 = src[0];
                        tmp2 = src[1];
#ifdef  RELOC_KVAR
                        if ((tmp1 & RELOC_MASK) == RELOC_KVAR)
                                tmp1 = 0;
                        if ((tmp2 & RELOC_MASK) == RELOC_KVAR)
                                tmp2 = 0;
#endif
                        if ((tmp1 ^ tmp2) & 3) {
                                printk (KERN_ERR"%s: ERROR1 IN SCRIPT at %d.\n",
                                        ncr_name(np), (int) (src-start-1));
                                MDELAY (1000);
                        }
                        /*
                        **      If PREFETCH feature not enabled, remove 
                        **      the NO FLUSH bit if present.
                        */
                        if ((opcode & SCR_NO_FLUSH) &&
                            !(np->features & FE_PFEN)) {
                                dst[-1] = cpu_to_scr(opcode & ~SCR_NO_FLUSH);
                                ++opchanged;
                        }
                        break;

                case 0x0:
                        /*
                        **      MOVE/CHMOV (absolute address)
                        */
                        if (!(np->features & FE_WIDE))
                                dst[-1] = cpu_to_scr(opcode | OPC_MOVE);
                        relocs = 1;
                        break;

                case 0x1:
                        /*
                        **      MOVE/CHMOV (table indirect)
                        */
                        if (!(np->features & FE_WIDE))
                                dst[-1] = cpu_to_scr(opcode | OPC_MOVE);
                        relocs = 0;
                        break;

                case 0x8:
                        /*
                        **      JUMP / CALL
                        **      don't relocate if relative :-)
                        */
                        if (opcode & 0x00800000)
                                relocs = 0;
                        else if ((opcode & 0xf8400000) == 0x80400000)/*JUMP64*/
                                relocs = 2;
                        else
                                relocs = 1;
                        break;

                case 0x4:
                case 0x5:
                case 0x6:
                case 0x7:
                        relocs = 1;
                        break;

                default:
                        relocs = 0;
                        break;
                };

                if (!relocs) {
                        *dst++ = cpu_to_scr(*src++);
                        continue;
                }
                while (relocs--) {
                        old = *src++;

                        switch (old & RELOC_MASK) {
                        case RELOC_REGISTER:
                                new = (old & ~RELOC_MASK) + np->base_ba;
                                break;
                        case RELOC_LABEL:
                                new = (old & ~RELOC_MASK) + np->p_script;
                                break;
                        case RELOC_LABELH:
                                new = (old & ~RELOC_MASK) + np->p_scripth;
                                break;
                        case RELOC_SOFTC:
                                new = (old & ~RELOC_MASK) + np->p_ncb;
                                break;
#ifdef  RELOC_KVAR
                        case RELOC_KVAR:
                                new=0;
                                if (((old & ~RELOC_MASK) < SCRIPT_KVAR_FIRST) ||
                                    ((old & ~RELOC_MASK) > SCRIPT_KVAR_LAST))
                                        panic("ncr KVAR out of range");
                                new = vtobus(script_kvars[old & ~RELOC_MASK]);
#endif
                                break;
                        case 0:
                                /* Don't relocate a 0 address. */
                                if (old == 0) {
                                        new = old;
                                        break;
                                }
                                /* fall through */
                        default:
                                new = 0;        /* For 'cc' not to complain */
                                panic("ncr_script_copy_and_bind: "
                                      "weird relocation %x\n", old);
                                break;
                        }

                        *dst++ = cpu_to_scr(new);
                }
        };
}

/*==========================================================
**
**
**      Auto configuration:  attach and init a host adapter.
**
**
**==========================================================
*/

/*
**      Linux host data structure.
*/

struct host_data {
     struct ncb *ncb;
};

/*
**      Print something which allows to retrieve the controler type, unit,
**      target, lun concerned by a kernel message.
*/

static void PRINT_TARGET(ncb_p np, int target)
{
        printk(KERN_INFO "%s-<%d,*>: ", ncr_name(np), target);
}

static void PRINT_LUN(ncb_p np, int target, int lun)
{
        printk(KERN_INFO "%s-<%d,%d>: ", ncr_name(np), target, lun);
}

static void PRINT_ADDR(Scsi_Cmnd *cmd)
{
        struct host_data *host_data = (struct host_data *) cmd->device->host->hostdata;
        PRINT_LUN(host_data->ncb, cmd->device->id, cmd->device->lun);
}

/*==========================================================
**
**      NCR chip clock divisor table.
**      Divisors are multiplied by 10,000,000 in order to make 
**      calculations more simple.
**
**==========================================================
*/

#define _5M 5000000
static u_long div_10M[] =
        {2*_5M, 3*_5M, 4*_5M, 6*_5M, 8*_5M, 12*_5M, 16*_5M};


/*===============================================================
**
**      Prepare io register values used by ncr_init() according 
**      to selected and supported features.
**
**      NCR/SYMBIOS chips allow burst lengths of 2, 4, 8, 16, 32, 64,
**      128 transfers. All chips support at least 16 transfers bursts. 
**      The 825A, 875 and 895 chips support bursts of up to 128 
**      transfers and the 895A and 896 support bursts of up to 64 
**      transfers. All other chips support up to 16 transfers bursts.
**
**      For PCI 32 bit data transfers each transfer is a DWORD (4 bytes).
**      It is a QUADWORD (8 bytes) for PCI 64 bit data transfers.
**      Only the 896 is able to perform 64 bit data transfers.
**
**      We use log base 2 (burst length) as internal code, with 
**      value 0 meaning "burst disabled".
**
**===============================================================
*/

/*
 *      Burst length from burst code.
 */
#define burst_length(bc) (!(bc))? 0 : 1 << (bc)

/*
 *      Burst code from io register bits.
 */
#define burst_code(dmode, ctest4, ctest5) \
        (ctest4) & 0x80? 0 : (((dmode) & 0xc0) >> 6) + ((ctest5) & 0x04) + 1

/*
 *      Set initial io register bits from burst code.
 */
static inline void ncr_init_burst(ncb_p np, u_char bc)
{
        np->rv_ctest4   &= ~0x80;
        np->rv_dmode    &= ~(0x3 << 6);
        np->rv_ctest5   &= ~0x4;

        if (!bc) {
                np->rv_ctest4   |= 0x80;
        }
        else {
                --bc;
                np->rv_dmode    |= ((bc & 0x3) << 6);
                np->rv_ctest5   |= (bc & 0x4);
        }
}

#ifdef SCSI_NCR_NVRAM_SUPPORT

/*
**      Get target set-up from Symbios format NVRAM.
*/

static void __init 
ncr_Symbios_setup_target(ncb_p np, int target, Symbios_nvram *nvram)
{
        tcb_p tp = &np->target[target];
        Symbios_target *tn = &nvram->target[target];

        tp->usrsync = tn->sync_period ? (tn->sync_period + 3) / 4 : 255;
        tp->usrwide = tn->bus_width == 0x10 ? 1 : 0;
        tp->usrtags =
                (tn->flags & SYMBIOS_QUEUE_TAGS_ENABLED)? MAX_TAGS : 0;

        if (!(tn->flags & SYMBIOS_DISCONNECT_ENABLE))
                tp->usrflag |= UF_NODISC;
        if (!(tn->flags & SYMBIOS_SCAN_AT_BOOT_TIME))
                tp->usrflag |= UF_NOSCAN;
}

/*
**      Get target set-up from Tekram format NVRAM.
*/

static void __init
ncr_Tekram_setup_target(ncb_p np, int target, Tekram_nvram *nvram)
{
        tcb_p tp = &np->target[target];
        struct Tekram_target *tn = &nvram->target[target];
        int i;

        if (tn->flags & TEKRAM_SYNC_NEGO) {
                i = tn->sync_index & 0xf;
                tp->usrsync = Tekram_sync[i];
        }

        tp->usrwide = (tn->flags & TEKRAM_WIDE_NEGO) ? 1 : 0;

        if (tn->flags & TEKRAM_TAGGED_COMMANDS) {
                tp->usrtags = 2 << nvram->max_tags_index;
        }

        if (!(tn->flags & TEKRAM_DISCONNECT_ENABLE))
                tp->usrflag = UF_NODISC;
 
        /* If any device does not support parity, we will not use this option */
        if (!(tn->flags & TEKRAM_PARITY_CHECK))
                np->rv_scntl0  &= ~0x0a; /* SCSI parity checking disabled */
}
#endif /* SCSI_NCR_NVRAM_SUPPORT */

/*
**      Save initial settings of some IO registers.
**      Assumed to have been set by BIOS.
*/
static void __init ncr_save_initial_setting(ncb_p np)
{
        np->sv_scntl0   = INB(nc_scntl0) & 0x0a;
        np->sv_dmode    = INB(nc_dmode)  & 0xce;
        np->sv_dcntl    = INB(nc_dcntl)  & 0xa8;
        np->sv_ctest3   = INB(nc_ctest3) & 0x01;
        np->sv_ctest4   = INB(nc_ctest4) & 0x80;
        np->sv_gpcntl   = INB(nc_gpcntl);
        np->sv_stest2   = INB(nc_stest2) & 0x20;
        np->sv_stest4   = INB(nc_stest4);
        np->sv_stest1   = INB(nc_stest1);

        np->sv_scntl3   = INB(nc_scntl3) & 0x07;
 
        if ((np->device_id == PCI_DEVICE_ID_LSI_53C1010) ||
                (np->device_id == PCI_DEVICE_ID_LSI_53C1010_66) ){
                /*
                ** C1010 always uses large fifo, bit 5 rsvd
                ** scntl4 used ONLY with C1010
                */
                np->sv_ctest5 = INB(nc_ctest5) & 0x04 ; 
                np->sv_scntl4 = INB(nc_scntl4); 
         }
         else {
                np->sv_ctest5 = INB(nc_ctest5) & 0x24 ; 
                np->sv_scntl4 = 0;
         }
}

/*
**      Prepare io register values used by ncr_init() 
**      according to selected and supported features.
*/
static int __init ncr_prepare_setting(ncb_p np, ncr_nvram *nvram)
{
        u_char  burst_max;
        u_long  period;
        int i;

#ifdef CONFIG_PARISC
        char scsi_mode = -1;
        struct hardware_path hwpath;
#endif

        /*
        **      Wide ?
        */

        np->maxwide     = (np->features & FE_WIDE)? 1 : 0;

        /*
         *  Guess the frequency of the chip's clock.
         */
        if      (np->features & (FE_ULTRA3 | FE_ULTRA2))
                np->clock_khz = 160000;
        else if (np->features & FE_ULTRA)
                np->clock_khz = 80000;
        else
                np->clock_khz = 40000;

        /*
         *  Get the clock multiplier factor.
         */
        if      (np->features & FE_QUAD)
                np->multiplier  = 4;
        else if (np->features & FE_DBLR)
                np->multiplier  = 2;
        else
                np->multiplier  = 1;

        /*
         *  Measure SCSI clock frequency for chips 
         *  it may vary from assumed one.
         */
        if (np->features & FE_VARCLK)
                ncr_getclock(np, np->multiplier);

        /*
         * Divisor to be used for async (timer pre-scaler).
         *
         * Note: For C1010 the async divisor is 2(8) if he
         * quadrupler is disabled (enabled).
         */

        if ( (np->device_id == PCI_DEVICE_ID_LSI_53C1010) ||
                (np->device_id == PCI_DEVICE_ID_LSI_53C1010_66)) {

                np->rv_scntl3 = 0; 
        }
        else
        {
                i = np->clock_divn - 1;
                while (--i >= 0) {
                        if (10ul * SCSI_NCR_MIN_ASYNC * np->clock_khz 
                                                        > div_10M[i]) {
                                ++i;
                                break;
                        }
                }
                np->rv_scntl3 = i+1;
        }


        /*
         * Save the ultra3 register for the C1010/C1010_66
         */

        np->rv_scntl4 = np->sv_scntl4;

        /*
         * Minimum synchronous period factor supported by the chip.
         * Btw, 'period' is in tenths of nanoseconds.
         */

        period = (4 * div_10M[0] + np->clock_khz - 1) / np->clock_khz;

#ifdef CONFIG_PARISC
        /* Host firmware (PDC) keeps a table for crippling SCSI capabilities.
         * Many newer machines export one channel of 53c896 chip
         * as SE, 50-pin HD.  Also used for Multi-initiator SCSI clusters
         * to set the SCSI Initiator ID.
         */
        get_pci_node_path(np->pdev, &hwpath);
        if (pdc_get_initiator(&hwpath, &np->myaddr, &period, &np->maxwide, &scsi_mode))
        {
                if (np->maxwide) 
                        np->features |= FE_WIDE;
                if (scsi_mode >= 0) {
                        /* C3000 PDC reports period/mode */
                        driver_setup.diff_support = 0;
                        switch(scsi_mode) {
                        case 0: np->scsi_mode = SMODE_SE; break;
                        case 1: np->scsi_mode = SMODE_HVD; break;
                        case 2: np->scsi_mode = SMODE_LVD; break;
                        default:        break;
                        }
                }
        }
#endif

        if      (period <= 250)         np->minsync = 10;
        else if (period <= 303)         np->minsync = 11;
        else if (period <= 500)         np->minsync = 12;
        else                            np->minsync = (period + 40 - 1) / 40;

        /*
         * Fix up. If sync. factor is 10 (160000Khz clock) and chip
         * supports ultra3, then min. sync. period 12.5ns and the factor is 9 
         * Also keep track of the maximum offset in ST mode which may differ  
         * from the maximum offset in DT mode. For now hardcoded to 31. 
         */

        if (np->features & FE_ULTRA3) {
                if (np->minsync == 10)
                        np->minsync = 9;
                np->maxoffs_st = 31;
        }
        else
                np->maxoffs_st = np->maxoffs;

        /*
         * Check against chip SCSI standard support (SCSI-2,ULTRA,ULTRA2).
         *
         * Transfer period minimums: SCSI-1 200 (50); Fast 100 (25)
         *                      Ultra 50 (12); Ultra2 (6); Ultra3 (3)           
         */

        if      (np->minsync < 25 && !(np->features & (FE_ULTRA|FE_ULTRA2|FE_ULTRA3)))
                np->minsync = 25;
        else if (np->minsync < 12 && (np->features & FE_ULTRA))
                np->minsync = 12;
        else if (np->minsync < 10 && (np->features & FE_ULTRA2))
                np->minsync = 10;
        else if (np->minsync < 9 && (np->features & FE_ULTRA3))
                np->minsync = 9;

        /*
         * Maximum synchronous period factor supported by the chip.
         */

        period = (11 * div_10M[np->clock_divn - 1]) / (4 * np->clock_khz);
        np->maxsync = period > 2540 ? 254 : period / 10;

        /*
        **      64 bit (53C895A or 53C896) ?
        */
        if (np->features & FE_DAC) {
                if (np->features & FE_DAC_IN_USE)
                        np->rv_ccntl1   |= (XTIMOD | EXTIBMV);
                else
                        np->rv_ccntl1   |= (DDAC);
        }

        /*
        **      Phase mismatch handled by SCRIPTS (53C895A, 53C896 or C1010) ?
        */
        if (np->features & FE_NOPM)
                np->rv_ccntl0   |= (ENPMJ);

        /*
        **      Prepare initial value of other IO registers
        */
#if defined SCSI_NCR_TRUST_BIOS_SETTING
        np->rv_scntl0   = np->sv_scntl0;
        np->rv_dmode    = np->sv_dmode;
        np->rv_dcntl    = np->sv_dcntl;
        np->rv_ctest3   = np->sv_ctest3;
        np->rv_ctest4   = np->sv_ctest4;
        np->rv_ctest5   = np->sv_ctest5;
        burst_max       = burst_code(np->sv_dmode, np->sv_ctest4, np->sv_ctest5);
#else

        /*
        **      Select burst length (dwords)
        */
        burst_max       = driver_setup.burst_max;
        if (burst_max == 255)
                burst_max = burst_code(np->sv_dmode, np->sv_ctest4, np->sv_ctest5);
        if (burst_max > 7)
                burst_max = 7;
        if (burst_max > np->maxburst)
                burst_max = np->maxburst;

        /*
        **      DEL 352 - 53C810 Rev x11 - Part Number 609-0392140 - ITEM 2.
        **      This chip and the 860 Rev 1 may wrongly use PCI cache line 
        **      based transactions on LOAD/STORE instructions. So we have 
        **      to prevent these chips from using such PCI transactions in 
        **      this driver. The generic sym53c8xx driver that does not use 
        **      LOAD/STORE instructions does not need this work-around.
        */
        if ((np->device_id == PCI_DEVICE_ID_NCR_53C810 &&
             np->revision_id >= 0x10 && np->revision_id <= 0x11) ||
            (np->device_id == PCI_DEVICE_ID_NCR_53C860 &&
             np->revision_id <= 0x1))
                np->features &= ~(FE_WRIE|FE_ERL|FE_ERMP);

        /*
        **      DEL ? - 53C1010 Rev 1 - Part Number 609-0393638
        **      64-bit Slave Cycles must be disabled.
        */
        if ( ((np->device_id == PCI_DEVICE_ID_LSI_53C1010) && (np->revision_id < 0x02) )
                || (np->device_id == PCI_DEVICE_ID_LSI_53C1010_66 ) )
                np->rv_ccntl1  |=  0x10;

        /*
        **      Select all supported special features.
        **      If we are using on-board RAM for scripts, prefetch (PFEN) 
        **      does not help, but burst op fetch (BOF) does.
        **      Disabling PFEN makes sure BOF will be used.
        */
        if (np->features & FE_ERL)
                np->rv_dmode    |= ERL;         /* Enable Read Line */
        if (np->features & FE_BOF)
                np->rv_dmode    |= BOF;         /* Burst Opcode Fetch */
        if (np->features & FE_ERMP)
                np->rv_dmode    |= ERMP;        /* Enable Read Multiple */
#if 1
        if ((np->features & FE_PFEN) && !np->base2_ba)
#else
        if (np->features & FE_PFEN)
#endif
                np->rv_dcntl    |= PFEN;        /* Prefetch Enable */
        if (np->features & FE_CLSE)
                np->rv_dcntl    |= CLSE;        /* Cache Line Size Enable */
        if (np->features & FE_WRIE)
                np->rv_ctest3   |= WRIE;        /* Write and Invalidate */


        if ( (np->device_id != PCI_DEVICE_ID_LSI_53C1010) &&
                        (np->device_id != PCI_DEVICE_ID_LSI_53C1010_66) &&
                        (np->features & FE_DFS))
                np->rv_ctest5   |= DFS;         /* Dma Fifo Size */
                                                /* C1010/C1010_66 always large fifo */

        /*
        **      Select some other
        */
        if (driver_setup.master_parity)
                np->rv_ctest4   |= MPEE;        /* Master parity checking */
        if (driver_setup.scsi_parity)
                np->rv_scntl0   |= 0x0a;        /*  full arb., ena parity, par->ATN  */

#ifdef SCSI_NCR_NVRAM_SUPPORT
        /*
        **      Get parity checking, host ID and verbose mode from NVRAM
        **/
        if (nvram) {
                switch(nvram->type) {
                case SCSI_NCR_TEKRAM_NVRAM:
                        np->myaddr = nvram->data.Tekram.host_id & 0x0f;
                        break;
                case SCSI_NCR_SYMBIOS_NVRAM:
                        if (!(nvram->data.Symbios.flags & SYMBIOS_PARITY_ENABLE))
                                np->rv_scntl0  &= ~0x0a;
                        np->myaddr = nvram->data.Symbios.host_id & 0x0f;
                        if (nvram->data.Symbios.flags & SYMBIOS_VERBOSE_MSGS)
                                np->verbose += 1;
                        break;
                }
        }
#endif
        /*
        **  Get SCSI addr of host adapter (set by bios?).
        */
        if (np->myaddr == 255) {
                np->myaddr = INB(nc_scid) & 0x07;
                if (!np->myaddr)
                        np->myaddr = SCSI_NCR_MYADDR;
        }

#endif /* SCSI_NCR_TRUST_BIOS_SETTING */

        /*
         *      Prepare initial io register bits for burst length
         */
        ncr_init_burst(np, burst_max);

        /*
        **      Set SCSI BUS mode.
        **
        **      - ULTRA2 chips (895/895A/896) 
        **        and ULTRA 3 chips (1010) report the current 
        **        BUS mode through the STEST4 IO register.
        **      - For previous generation chips (825/825A/875), 
        **        user has to tell us how to check against HVD, 
        **        since a 100% safe algorithm is not possible.
        */
        np->scsi_mode = SMODE_SE;
        if      (np->features & (FE_ULTRA2 | FE_ULTRA3))
                np->scsi_mode = (np->sv_stest4 & SMODE);
        else if (np->features & FE_DIFF) {
                switch(driver_setup.diff_support) {
                case 4: /* Trust previous settings if present, then GPIO3 */
                        if (np->sv_scntl3) {
                                if (np->sv_stest2 & 0x20)
                                        np->scsi_mode = SMODE_HVD;
                                break;
                        }
                case 3: /* SYMBIOS controllers report HVD through GPIO3 */
                        if (nvram && nvram->type != SCSI_NCR_SYMBIOS_NVRAM)
                                break;
                        if (INB(nc_gpreg) & 0x08)
                                break;
                case 2: /* Set HVD unconditionally */
                        np->scsi_mode = SMODE_HVD;
                case 1: /* Trust previous settings for HVD */
                        if (np->sv_stest2 & 0x20)
                                np->scsi_mode = SMODE_HVD;
                        break;
                default:/* Don't care about HVD */      
                        break;
                }
        }
        if (np->scsi_mode == SMODE_HVD)
                np->rv_stest2 |= 0x20;

        /*
        **      Set LED support from SCRIPTS.
        **      Ignore this feature for boards known to use a 
        **      specific GPIO wiring and for the 895A or 896 
        **      that drive the LED directly.
        **      Also probe initial setting of GPIO0 as output.
        */
        if ((driver_setup.led_pin ||
             (nvram && nvram->type == SCSI_NCR_SYMBIOS_NVRAM)) &&
            !(np->features & FE_LEDC) && !(np->sv_gpcntl & 0x01))
                np->features |= FE_LED0;

        /*
        **      Set irq mode.
        */
        switch(driver_setup.irqm & 3) {
        case 2:
                np->rv_dcntl    |= IRQM;
                break;
        case 1:
                np->rv_dcntl    |= (np->sv_dcntl & IRQM);
                break;
        default:
                break;
        }

        /*
        **      Configure targets according to driver setup.
        **      If NVRAM present get targets setup from NVRAM.
        **      Allow to override sync, wide and NOSCAN from 
        **      boot command line.
        */
        for (i = 0 ; i < MAX_TARGET ; i++) {
                tcb_p tp = &np->target[i];

                tp->usrsync = 255;
#ifdef SCSI_NCR_NVRAM_SUPPORT
                if (nvram) {
                        switch(nvram->type) {
                        case SCSI_NCR_TEKRAM_NVRAM:
                                ncr_Tekram_setup_target(np, i, &nvram->data.Tekram);
                                break;
                        case SCSI_NCR_SYMBIOS_NVRAM:
                                ncr_Symbios_setup_target(np, i, &nvram->data.Symbios);
                                break;
                        }
                        if (driver_setup.use_nvram & 0x2)
                                tp->usrsync = driver_setup.default_sync;
                        if (driver_setup.use_nvram & 0x4)
                                tp->usrwide = driver_setup.max_wide;
                        if (driver_setup.use_nvram & 0x8)
                                tp->usrflag &= ~UF_NOSCAN;
                }
                else {
#else
                if (1) {
#endif
                        tp->usrsync = driver_setup.default_sync;
                        tp->usrwide = driver_setup.max_wide;
                        tp->usrtags = MAX_TAGS;
                        if (!driver_setup.disconnection)
                                np->target[i].usrflag = UF_NODISC;
                }
        }

        /*
        **      Announce all that stuff to user.
        */

        i = nvram ? nvram->type : 0;
        printk(KERN_INFO "%s: %sID %d, Fast-%d%s%s\n", ncr_name(np),
                i  == SCSI_NCR_SYMBIOS_NVRAM ? "Symbios format NVRAM, " :
                (i == SCSI_NCR_TEKRAM_NVRAM  ? "Tekram format NVRAM, " : ""),
                np->myaddr,
                np->minsync < 10 ? 80 : 
                        (np->minsync < 12 ? 40 : (np->minsync < 25 ? 20 : 10) ),
                (np->rv_scntl0 & 0xa)   ? ", Parity Checking"   : ", NO Parity",
                (np->rv_stest2 & 0x20)  ? ", Differential"      : "");

        if (bootverbose > 1) {
                printk (KERN_INFO "%s: initial SCNTL3/DMODE/DCNTL/CTEST3/4/5 = "
                        "(hex) %02x/%02x/%02x/%02x/%02x/%02x\n",
                        ncr_name(np), np->sv_scntl3, np->sv_dmode, np->sv_dcntl,
                        np->sv_ctest3, np->sv_ctest4, np->sv_ctest5);

                printk (KERN_INFO "%s: final   SCNTL3/DMODE/DCNTL/CTEST3/4/5 = "
                        "(hex) %02x/%02x/%02x/%02x/%02x/%02x\n",
                        ncr_name(np), np->rv_scntl3, np->rv_dmode, np->rv_dcntl,
                        np->rv_ctest3, np->rv_ctest4, np->rv_ctest5);
        }

        if (bootverbose && np->base2_ba)
                printk (KERN_INFO "%s: on-chip RAM at 0x%lx\n",
                        ncr_name(np), np->base2_ba);

        return 0;
}


#ifdef SCSI_NCR_DEBUG_NVRAM

void __init ncr_display_Symbios_nvram(ncb_p np, Symbios_nvram *nvram)
{
        int i;

        /* display Symbios nvram host data */
        printk(KERN_DEBUG "%s: HOST ID=%d%s%s%s%s%s\n",
                ncr_name(np), nvram->host_id & 0x0f,
                (nvram->flags  & SYMBIOS_SCAM_ENABLE)   ? " SCAM"       :"",
                (nvram->flags  & SYMBIOS_PARITY_ENABLE) ? " PARITY"     :"",
                (nvram->flags  & SYMBIOS_VERBOSE_MSGS)  ? " VERBOSE"    :"", 
                (nvram->flags  & SYMBIOS_CHS_MAPPING)   ? " CHS_ALT"    :"", 
                (nvram->flags1 & SYMBIOS_SCAN_HI_LO)    ? " HI_LO"      :"");

        /* display Symbios nvram drive data */
        for (i = 0 ; i < 15 ; i++) {
                struct Symbios_target *tn = &nvram->target[i];
                printk(KERN_DEBUG "%s-%d:%s%s%s%s WIDTH=%d SYNC=%d TMO=%d\n",
                ncr_name(np), i,
                (tn->flags & SYMBIOS_DISCONNECT_ENABLE) ? " DISC"       : "",
                (tn->flags & SYMBIOS_SCAN_AT_BOOT_TIME) ? " SCAN_BOOT"  : "",
                (tn->flags & SYMBIOS_SCAN_LUNS)         ? " SCAN_LUNS"  : "",
                (tn->flags & SYMBIOS_QUEUE_TAGS_ENABLED)? " TCQ"        : "",
                tn->bus_width,
                tn->sync_period / 4,
                tn->timeout);
        }
}

static u_char Tekram_boot_delay[7] __initdata = {3, 5, 10, 20, 30, 60, 120};

void __init ncr_display_Tekram_nvram(ncb_p np, Tekram_nvram *nvram)
{
        int i, tags, boot_delay;
        char *rem;

        /* display Tekram nvram host data */
        tags = 2 << nvram->max_tags_index;
        boot_delay = 0;
        if (nvram->boot_delay_index < 6)
                boot_delay = Tekram_boot_delay[nvram->boot_delay_index];
        switch((nvram->flags & TEKRAM_REMOVABLE_FLAGS) >> 6) {
        default:
        case 0: rem = "";                       break;
        case 1: rem = " REMOVABLE=boot device"; break;
        case 2: rem = " REMOVABLE=all";         break;
        }

        printk(KERN_DEBUG
                "%s: HOST ID=%d%s%s%s%s%s%s%s%s%s BOOT DELAY=%d tags=%d\n",
                ncr_name(np), nvram->host_id & 0x0f,
                (nvram->flags1 & SYMBIOS_SCAM_ENABLE)   ? " SCAM"       :"",
                (nvram->flags & TEKRAM_MORE_THAN_2_DRIVES) ? " >2DRIVES"        :"",
                (nvram->flags & TEKRAM_DRIVES_SUP_1GB)  ? " >1GB"       :"",
                (nvram->flags & TEKRAM_RESET_ON_POWER_ON) ? " RESET"    :"",
                (nvram->flags & TEKRAM_ACTIVE_NEGATION) ? " ACT_NEG"    :"",
                (nvram->flags & TEKRAM_IMMEDIATE_SEEK)  ? " IMM_SEEK"   :"",
                (nvram->flags & TEKRAM_SCAN_LUNS)       ? " SCAN_LUNS"  :"",
                (nvram->flags1 & TEKRAM_F2_F6_ENABLED)  ? " F2_F6"      :"",
                rem, boot_delay, tags);

        /* display Tekram nvram drive data */
        for (i = 0; i <= 15; i++) {
                int sync, j;
                struct Tekram_target *tn = &nvram->target[i];
                j = tn->sync_index & 0xf;
                sync = Tekram_sync[j];
                printk(KERN_DEBUG "%s-%d:%s%s%s%s%s%s PERIOD=%d\n",
                ncr_name(np), i,
                (tn->flags & TEKRAM_PARITY_CHECK)       ? " PARITY"     : "",
                (tn->flags & TEKRAM_SYNC_NEGO)          ? " SYNC"       : "",
                (tn->flags & TEKRAM_DISCONNECT_ENABLE)  ? " DISC"       : "",
                (tn->flags & TEKRAM_START_CMD)          ? " START"      : "",
                (tn->flags & TEKRAM_TAGGED_COMMANDS)    ? " TCQ"        : "",
                (tn->flags & TEKRAM_WIDE_NEGO)          ? " WIDE"       : "",
                sync);
        }
}
#endif /* SCSI_NCR_DEBUG_NVRAM */

/*
**      Host attach and initialisations.
**
**      Allocate host data and ncb structure.
**      Request IO region and remap MMIO region.
**      Do chip initialization.
**      If all is OK, install interrupt handling and
**      start the timer daemon.
*/

static int __init 
ncr_attach (Scsi_Host_Template *tpnt, int unit, ncr_device *device)
{
        struct host_data *host_data;
        ncb_p np = 0;
        struct Scsi_Host *instance = 0;
        u_long flags = 0;
        ncr_nvram *nvram = device->nvram;
        int i;

        printk(KERN_INFO NAME53C "%s-%d: rev 0x%x on pci bus %d device %d function %d "
#ifdef __sparc__
                "irq %s\n",
#else
                "irq %d\n",
#endif
                device->chip.name, unit, device->chip.revision_id,
                device->slot.bus, (device->slot.device_fn & 0xf8) >> 3,
                device->slot.device_fn & 7,
#ifdef __sparc__
                __irq_itoa(device->slot.irq));
#else
                device->slot.irq);
#endif

        /*
        **      Allocate host_data structure
        */
        if (!(instance = scsi_register(tpnt, sizeof(*host_data))))
                goto attach_error;
        host_data = (struct host_data *) instance->hostdata;

        /*
        **      Allocate the host control block.
        */
        np = __m_calloc_dma(device->pdev, sizeof(struct ncb), "NCB");
        if (!np)
                goto attach_error;
        NCR_INIT_LOCK_NCB(np);
        np->pdev  = device->pdev;
        np->p_ncb = vtobus(np);
        host_data->ncb = np;

        /*
        **      Store input informations in the host data structure.
        */
        strncpy(np->chip_name, device->chip.name, sizeof(np->chip_name) - 1);
        np->unit        = unit;
        np->verbose     = driver_setup.verbose;
        sprintf(np->inst_name, NAME53C "%s-%d", np->chip_name, np->unit);
        np->device_id   = device->chip.device_id;
        np->revision_id = device->chip.revision_id;
        np->bus         = device->slot.bus;
        np->device_fn   = device->slot.device_fn;
        np->features    = device->chip.features;
        np->clock_divn  = device->chip.nr_divisor;
        np->maxoffs     = device->chip.offset_max;
        np->maxburst    = device->chip.burst_max;
        np->myaddr      = device->host_id;

        /*
        **      Allocate the start queue.
        */
        np->squeue = (ncrcmd *)
                m_calloc_dma(sizeof(ncrcmd)*(MAX_START*2), "SQUEUE");
        if (!np->squeue)
                goto attach_error;
        np->p_squeue = vtobus(np->squeue);

        /*
        **      Allocate the done queue.
        */
        np->dqueue = (ncrcmd *)
                m_calloc_dma(sizeof(ncrcmd)*(MAX_START*2), "DQUEUE");
        if (!np->dqueue)
                goto attach_error;

        /*
        **      Allocate the target bus address array.
        */
        np->targtbl = (u_int32 *) m_calloc_dma(256, "TARGTBL");
        if (!np->targtbl)
                goto attach_error;

        /*
        **      Allocate SCRIPTS areas
        */
        np->script0     = (struct script *) 
                m_calloc_dma(sizeof(struct script),  "SCRIPT");
        if (!np->script0)
                goto attach_error;
        np->scripth0    = (struct scripth *)
                m_calloc_dma(sizeof(struct scripth), "SCRIPTH");
        if (!np->scripth0)
                goto attach_error;

        /*
        **      Initialyze the CCB free queue and,
        **      allocate some CCB. We need at least ONE.
        */
        xpt_que_init(&np->free_ccbq);
        xpt_que_init(&np->b0_ccbq);
        if (!ncr_alloc_ccb(np))
                goto attach_error;

        /*
        **    Initialize timer structure
        **
        */
        init_timer(&np->timer);
        np->timer.data     = (unsigned long) np;
        np->timer.function = sym53c8xx_timeout;

        /*
        **      Try to map the controller chip to
        **      virtual and physical memory.
        */

        np->base_ba     = device->slot.base;
        np->base_ws     = (np->features & FE_IO256)? 256 : 128;
        np->base2_ba    = (np->features & FE_RAM)? device->slot.base_2 : 0;

#ifndef SCSI_NCR_IOMAPPED
        np->base_va = remap_pci_mem(device->slot.base_c, np->base_ws);
        if (!np->base_va) {
                printk(KERN_ERR "%s: can't map PCI MMIO region\n",ncr_name(np));
                goto attach_error;
        }
        else if (bootverbose > 1)
                printk(KERN_INFO "%s: using memory mapped IO\n", ncr_name(np));

        /*
        **      Make the controller's registers available.
        **      Now the INB INW INL OUTB OUTW OUTL macros
        **      can be used safely.
        */

        np->reg = (struct ncr_reg *) np->base_va;

#endif /* !defined SCSI_NCR_IOMAPPED */

        /*
        **      If on-chip RAM is used, make sure SCRIPTS isn't too large.
        */
        if (np->base2_ba && sizeof(struct script) > 4096) {
                printk(KERN_ERR "%s: script too large.\n", ncr_name(np));
                goto attach_error;
        }

        /*
        **      Try to map the controller chip into iospace.
        */

        if (device->slot.io_port) {
                request_region(device->slot.io_port, np->base_ws, NAME53C8XX);
                np->base_io = device->slot.io_port;
        }

#ifdef SCSI_NCR_NVRAM_SUPPORT
        if (nvram) {
                switch(nvram->type) {
                case SCSI_NCR_SYMBIOS_NVRAM:
#ifdef SCSI_NCR_DEBUG_NVRAM
                        ncr_display_Symbios_nvram(np, &nvram->data.Symbios);
#endif
                        break;
                case SCSI_NCR_TEKRAM_NVRAM:
#ifdef SCSI_NCR_DEBUG_NVRAM
                        ncr_display_Tekram_nvram(np, &nvram->data.Tekram);
#endif
                        break;
                default:
                        nvram = 0;
#ifdef SCSI_NCR_DEBUG_NVRAM
                        printk(KERN_DEBUG "%s: NVRAM: None or invalid data.\n", ncr_name(np));
#endif
                }
        }
#endif

        /*
        **      Save setting of some IO registers, so we will 
        **      be able to probe specific implementations.
        */
        ncr_save_initial_setting (np);

        /*
        **      Reset the chip now, since it has been reported 
        **      that SCSI clock calibration may not work properly 
        **      if the chip is currently active.
        */
        ncr_chip_reset (np);

        /*
        **      Do chip dependent initialization.
        */
        (void) ncr_prepare_setting(np, nvram);

        /*
        **      Check the PCI clock frequency if needed.
        **      
        **      Must be done after ncr_prepare_setting since it destroys 
        **      STEST1 that is used to probe for the clock multiplier.
        **
        **      The range is currently [22688 - 45375 Khz], given 
        **      the values used by ncr_getclock().
        **      This calibration of the frequecy measurement 
        **      algorithm against the PCI clock frequency is only 
        **      performed if the driver has had to measure the SCSI 
        **      clock due to other heuristics not having been enough 
        **      to deduce the SCSI clock frequency.
        **
        **      When the chip has been initialized correctly by the 
        **      SCSI BIOS, the driver deduces the presence of the 
        **      clock multiplier and the value of the SCSI clock from 
        **      initial values of IO registers, and therefore no 
        **      clock measurement is performed.
        **      Normally the driver should never have to measure any 
        **      clock, unless the controller may use a 80 MHz clock 
        **      or has a clock multiplier and any of the following 
        **      condition is met:
        **
        **      - No SCSI BIOS is present.
        **      - SCSI BIOS did'nt enable the multiplier for some reason.
        **      - User has disabled the controller from the SCSI BIOS.
        **      - User booted the O/S from another O/S that did'nt enable 
        **        the multiplier for some reason.
        **
        **      As a result, the driver may only have to measure some 
        **      frequency in very unusual situations.
        **
        **      For this reality test against the PCI clock to really 
        **      protect against flaws in the udelay() calibration or 
        **      driver problem that affect the clock measurement 
        **      algorithm, the actual PCI clock frequency must be 33 MHz.
        */
        i = np->pciclock_max ? ncr_getpciclock(np) : 0;
        if (i && (i < np->pciclock_min  || i > np->pciclock_max)) {
                printk(KERN_ERR "%s: PCI clock (%u KHz) is out of range "
                        "[%u KHz - %u KHz].\n",
                       ncr_name(np), i, np->pciclock_min, np->pciclock_max);
                goto attach_error;
        }

        /*
        **      Patch script to physical addresses
        */
        ncr_script_fill (&script0, &scripth0);

        np->p_script    = vtobus(np->script0);
        np->p_scripth   = vtobus(np->scripth0);
        np->p_scripth0  = np->p_scripth;

        if (np->base2_ba) {
                np->p_script    = np->base2_ba;
                if (np->features & FE_RAM8K) {
                        np->base2_ws = 8192;
                        np->p_scripth = np->p_script + 4096;
#if BITS_PER_LONG > 32
                        np->scr_ram_seg = cpu_to_scr(np->base2_ba >> 32);
#endif
                }
                else
                        np->base2_ws = 4096;
#ifndef SCSI_NCR_PCI_MEM_NOT_SUPPORTED
                np->base2_va = 
                        remap_pci_mem(device->slot.base_2_c, np->base2_ws);
                if (!np->base2_va) {
                        printk(KERN_ERR "%s: can't map PCI MEMORY region\n",
                               ncr_name(np));
                        goto attach_error;
                }
#endif
        }

        ncr_script_copy_and_bind (np, (ncrcmd *) &script0, (ncrcmd *) np->script0, sizeof(struct script));
        ncr_script_copy_and_bind (np, (ncrcmd *) &scripth0, (ncrcmd *) np->scripth0, sizeof(struct scripth));

        /*
        **      Patch some variables in SCRIPTS
        */
        np->scripth0->pm0_data_addr[0] = 
                        cpu_to_scr(NCB_SCRIPT_PHYS(np, pm0_data));
        np->scripth0->pm1_data_addr[0] = 
                        cpu_to_scr(NCB_SCRIPT_PHYS(np, pm1_data));

        /*
        **      Patch if not Ultra 3 - Do not write to scntl4
        */
        if (np->features & FE_ULTRA3) {
                np->script0->resel_scntl4[0] = cpu_to_scr(SCR_LOAD_REL (scntl4, 1));
                np->script0->resel_scntl4[1] = cpu_to_scr(offsetof(struct tcb, uval));
        }


#ifdef SCSI_NCR_PCI_MEM_NOT_SUPPORTED
        np->scripth0->script0_ba[0]     = cpu_to_scr(vtobus(np->script0));
        np->scripth0->script0_ba64[0]   = cpu_to_scr(vtobus(np->script0));
        np->scripth0->scripth0_ba64[0]  = cpu_to_scr(vtobus(np->scripth0));
        np->scripth0->ram_seg64[0]      = np->scr_ram_seg;
#endif
        /*
        **      Prepare the idle and invalid task actions.
        */
        np->idletask.start      = cpu_to_scr(NCB_SCRIPT_PHYS (np, idle));
        np->idletask.restart    = cpu_to_scr(NCB_SCRIPTH_PHYS (np, bad_i_t_l));
        np->p_idletask          = NCB_PHYS(np, idletask);

        np->notask.start        = cpu_to_scr(NCB_SCRIPT_PHYS (np, idle));
        np->notask.restart      = cpu_to_scr(NCB_SCRIPTH_PHYS (np, bad_i_t_l));
        np->p_notask            = NCB_PHYS(np, notask);

        np->bad_i_t_l.start     = cpu_to_scr(NCB_SCRIPT_PHYS (np, idle));
        np->bad_i_t_l.restart   = cpu_to_scr(NCB_SCRIPTH_PHYS (np, bad_i_t_l));
        np->p_bad_i_t_l         = NCB_PHYS(np, bad_i_t_l);

        np->bad_i_t_l_q.start   = cpu_to_scr(NCB_SCRIPT_PHYS (np, idle));
        np->bad_i_t_l_q.restart = cpu_to_scr(NCB_SCRIPTH_PHYS (np,bad_i_t_l_q));
        np->p_bad_i_t_l_q       = NCB_PHYS(np, bad_i_t_l_q);

        /*
        **      Allocate and prepare the bad lun table.
        */
        np->badluntbl = m_calloc_dma(256, "BADLUNTBL");
        if (!np->badluntbl)
                goto attach_error;

        assert (offsetof(struct lcb, resel_task) == 0);
        np->resel_badlun = cpu_to_scr(NCB_SCRIPTH_PHYS(np, resel_bad_lun));

        for (i = 0 ; i < 64 ; i++)
                np->badluntbl[i] = cpu_to_scr(NCB_PHYS(np, resel_badlun));

        /*
        **      Prepare the target bus address array.
        */
        np->scripth0->targtbl[0] = cpu_to_scr(vtobus(np->targtbl));
        for (i = 0 ; i < MAX_TARGET ; i++) {
                np->targtbl[i] = cpu_to_scr(NCB_PHYS(np, target[i]));
                np->target[i].b_luntbl = cpu_to_scr(vtobus(np->badluntbl));
                np->target[i].b_lun0   = cpu_to_scr(NCB_PHYS(np, resel_badlun));
        }

        /*
        **    Patch the script for LED support.
        */

        if (np->features & FE_LED0) {
                np->script0->idle[0]  =
                                cpu_to_scr(SCR_REG_REG(gpreg, SCR_OR,  0x01));
                np->script0->reselected[0] =
                                cpu_to_scr(SCR_REG_REG(gpreg, SCR_AND, 0xfe));
                np->script0->start[0] =
                                cpu_to_scr(SCR_REG_REG(gpreg, SCR_AND, 0xfe));
        }

        /*
        **      Patch the script to provide an extra clock cycle on
        **      data out phase - 53C1010_66MHz part only.
        **      (Fixed in rev. 1 of the chip)
        */
        if (np->device_id == PCI_DEVICE_ID_LSI_53C1010_66 &&
            np->revision_id < 1){
                np->script0->datao_phase[0] =
                                cpu_to_scr(SCR_REG_REG(scntl4, SCR_OR, 0x0c));
        }

#ifdef SCSI_NCR_IARB_SUPPORT
        /*
        **    If user does not want to use IMMEDIATE ARBITRATION
        **    when we are reselected while attempting to arbitrate,
        **    patch the SCRIPTS accordingly with a SCRIPT NO_OP.
        */
        if (!(driver_setup.iarb & 1))
                np->script0->ungetjob[0] = cpu_to_scr(SCR_NO_OP);
        /*
        **    If user wants IARB to be set when we win arbitration 
        **    and have other jobs, compute the max number of consecutive 
        **    settings of IARB hint before we leave devices a chance to 
        **    arbitrate for reselection.
        */
        np->iarb_max = (driver_setup.iarb >> 4);
#endif

        /*
        **      DEL 472 - 53C896 Rev 1 - Part Number 609-0393055 - ITEM 5.
        */
        if (np->device_id == PCI_DEVICE_ID_NCR_53C896 &&
            np->revision_id <= 0x1 && (np->features & FE_NOPM)) {
                np->scatter = ncr_scatter_896R1;
                np->script0->datai_phase[0] = cpu_to_scr(SCR_JUMP);
                np->script0->datai_phase[1] = 
                                cpu_to_scr(NCB_SCRIPTH_PHYS (np, tweak_pmj));
                np->script0->datao_phase[0] = cpu_to_scr(SCR_JUMP);
                np->script0->datao_phase[1] = 
                                cpu_to_scr(NCB_SCRIPTH_PHYS (np, tweak_pmj));
        }
        else
#ifdef DEBUG_896R1
                np->scatter = ncr_scatter_896R1;
#else
                np->scatter = ncr_scatter;
#endif

        /*
        **      Reset chip.
        **      We should use ncr_soft_reset(), but we donnot want to do 
        **      so, since we may not be safe if ABRT interrupt occurs due 
        **      to the BIOS or previous O/S having enable this interrupt.
        **
        **      For C1010 need to set ABRT bit prior to SRST if SCRIPTs
        **      are running. Not true in this case.
        */
        ncr_chip_reset(np);

        /*
        **      Now check the cache handling of the pci chipset.
        */

        if (ncr_snooptest (np)) {
                printk (KERN_ERR "CACHE INCORRECTLY CONFIGURED.\n");
                goto attach_error;
        };

        /*
        **      Install the interrupt handler.
        **      If we synchonize the C code with SCRIPTS on interrupt, 
        **      we donnot want to share the INTR line at all.
        */
        if (request_irq(device->slot.irq, sym53c8xx_intr,
#ifdef SCSI_NCR_PCIQ_SYNC_ON_INTR
                        ((driver_setup.irqm & 0x20) ? 0 : SA_INTERRUPT),
#else
                        ((driver_setup.irqm & 0x10) ? 0 : SA_SHIRQ) |
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,2,0)
                        ((driver_setup.irqm & 0x20) ? 0 : SA_INTERRUPT),
#else
                        0,
#endif
#endif
                        NAME53C8XX, np)) {
                printk(KERN_ERR "%s: request irq %d failure\n",
                        ncr_name(np), device->slot.irq);
                goto attach_error;
        }
        np->irq = device->slot.irq;

        /*
        **      After SCSI devices have been opened, we cannot
        **      reset the bus safely, so we do it here.
        **      Interrupt handler does the real work.
        **      Process the reset exception,
        **      if interrupts are not enabled yet.
        **      Then enable disconnects.
        */
        NCR_LOCK_NCB(np, flags);
        if (ncr_reset_scsi_bus(np, 0, driver_setup.settle_delay) != 0) {
                printk(KERN_ERR "%s: FATAL ERROR: CHECK SCSI BUS - CABLES, TERMINATION, DEVICE POWER etc.!\n", ncr_name(np));

                NCR_UNLOCK_NCB(np, flags);
                goto attach_error;
        }
        ncr_exception (np);

        /*
        **      The middle-level SCSI driver does not
        **      wait for devices to settle.
        **      Wait synchronously if more than 2 seconds.
        */
        if (driver_setup.settle_delay > 2) {
                printk(KERN_INFO "%s: waiting %d seconds for scsi devices to settle...\n",
                        ncr_name(np), driver_setup.settle_delay);
                MDELAY (1000 * driver_setup.settle_delay);
        }

        /*
        **      start the timeout daemon
        */
        np->lasttime=0;
        ncr_timeout (np);

        /*
        **  use SIMPLE TAG messages by default
        */
#ifdef SCSI_NCR_ALWAYS_SIMPLE_TAG
        np->order = M_SIMPLE_TAG;
#endif

        /*
        **  Done.
        **      Fill Linux host instance structure
        **      and return success.
        */
        instance->max_channel   = 0;
        instance->this_id       = np->myaddr;
        instance->max_id        = np->maxwide ? 16 : 8;
        instance->max_lun       = MAX_LUN;
#ifndef SCSI_NCR_IOMAPPED
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,3,29)
        instance->base          = (unsigned long) np->reg;
#else
        instance->base          = (char *) np->reg;
#endif
#endif
        instance->irq           = np->irq;
        instance->unique_id     = np->base_io;
        instance->io_port       = np->base_io;
        instance->n_io_port     = np->base_ws;
        instance->dma_channel   = 0;
        instance->cmd_per_lun   = MAX_TAGS;
        instance->can_queue     = (MAX_START-4);
        scsi_set_device(instance, &device->pdev->dev);

        np->check_integrity       = 0;

#ifdef  SCSI_NCR_INTEGRITY_CHECKING
        instance->check_integrity = 0;

#ifdef SCSI_NCR_ENABLE_INTEGRITY_CHECK
        if ( !(driver_setup.bus_check & 0x04) ) {
                np->check_integrity       = 1;
                instance->check_integrity = 1;
        }
#endif
#endif
        
        NCR_UNLOCK_NCB(np, flags);

        /*
        **      Now let the generic SCSI driver
        **      look for the SCSI devices on the bus ..
        */
        return 0;

attach_error:
        if (!instance) return -1;
        printk(KERN_INFO "%s: giving up ...\n", ncr_name(np));
        if (np)
                ncr_free_resources(np);
        scsi_unregister(instance);

        return -1;
 }


/*
**      Free controller resources.
*/
static void ncr_free_resources(ncb_p np)
{
        ccb_p cp;
        tcb_p tp;
        lcb_p lp;
        int target, lun;

        if (np->irq)
                free_irq(np->irq, np);
        if (np->base_io)
                release_region(np->base_io, np->base_ws);
#ifndef SCSI_NCR_PCI_MEM_NOT_SUPPORTED
        if (np->base_va)
                unmap_pci_mem(np->base_va, np->base_ws);
        if (np->base2_va)
                unmap_pci_mem(np->base2_va, np->base2_ws);
#endif
        if (np->scripth0)
                m_free_dma(np->scripth0, sizeof(struct scripth), "SCRIPTH");
        if (np->script0)
                m_free_dma(np->script0, sizeof(struct script), "SCRIPT");
        if (np->squeue)
                m_free_dma(np->squeue, sizeof(ncrcmd)*(MAX_START*2), "SQUEUE");
        if (np->dqueue)
                m_free_dma(np->dqueue, sizeof(ncrcmd)*(MAX_START*2),"DQUEUE");

        while ((cp = np->ccbc) != NULL) {
                np->ccbc = cp->link_ccb;
                m_free_dma(cp, sizeof(*cp), "CCB");
        }

        if (np->badluntbl)
                m_free_dma(np->badluntbl, 256,"BADLUNTBL");

        for (target = 0; target < MAX_TARGET ; target++) {
                tp = &np->target[target];
                for (lun = 0 ; lun < MAX_LUN ; lun++) {
                        lp = ncr_lp(np, tp, lun);
                        if (!lp)
                                continue;
                        if (lp->tasktbl != &lp->tasktbl_0)
                                m_free_dma(lp->tasktbl, MAX_TASKS*4, "TASKTBL");
                        if (lp->cb_tags)
                                m_free(lp->cb_tags, MAX_TAGS, "CB_TAGS");
                        m_free_dma(lp, sizeof(*lp), "LCB");
                }
#if MAX_LUN > 1
                if (tp->lmp)
                        m_free(tp->lmp, MAX_LUN * sizeof(lcb_p), "LMP");
                if (tp->luntbl)
                        m_free_dma(tp->luntbl, 256, "LUNTBL");
#endif 
        }

        if (np->targtbl)
                m_free_dma(np->targtbl, 256, "TARGTBL");

        m_free_dma(np, sizeof(*np), "NCB");
}


/*==========================================================
**
**
**      Done SCSI commands list management.
**
**      We donnot enter the scsi_done() callback immediately 
**      after a command has been seen as completed but we 
**      insert it into a list which is flushed outside any kind 
**      of driver critical section.
**      This allows to do minimal stuff under interrupt and 
**      inside critical sections and to also avoid locking up 
**      on recursive calls to driver entry points under SMP.
**      In fact, the only kernel point which is entered by the 
**      driver with a driver lock set is get_free_pages(GFP_ATOMIC...) 
**      that shall not reenter the driver under any circumstance.
**
**==========================================================
*/
static inline void ncr_queue_done_cmd(ncb_p np, Scsi_Cmnd *cmd)
{
        unmap_scsi_data(np, cmd);
        cmd->host_scribble = (char *) np->done_list;
        np->done_list = cmd;
}

static inline void ncr_flush_done_cmds(Scsi_Cmnd *lcmd)
{
        Scsi_Cmnd *cmd;

        while (lcmd) {
                cmd = lcmd;
                lcmd = (Scsi_Cmnd *) cmd->host_scribble;
                cmd->scsi_done(cmd);
        }
}

/*==========================================================
**
**
**      Prepare the next negotiation message for integrity check,
**      if needed.
**
**      Fill in the part of message buffer that contains the 
**      negotiation and the nego_status field of the CCB.
**      Returns the size of the message in bytes.
**
**      If tp->ppr_negotiation is 1 and a M_REJECT occurs, then
**      we disable ppr_negotiation.  If the first ppr_negotiation is
**      successful, set this flag to 2.
**
**==========================================================
*/
#ifdef  SCSI_NCR_INTEGRITY_CHECKING
static int ncr_ic_nego(ncb_p np, ccb_p cp, Scsi_Cmnd *cmd, u_char *msgptr)
{
        tcb_p tp = &np->target[cp->target];
        int msglen = 0;
        int nego = 0;
        u_char new_width, new_offset, new_period;
        u_char no_increase;

        if (tp->ppr_negotiation == 1)   /* PPR message successful */
                tp->ppr_negotiation = 2;

        if (tp->inq_done) {

                if (!tp->ic_maximums_set) {
                        tp->ic_maximums_set = 1;

                        /* 
                         * Check against target, host and user limits  
                         */
                        if ( (tp->inq_byte7 & INQ7_WIDE16) && 
                                        np->maxwide  && tp->usrwide) 
                                tp->ic_max_width = 1;
                        else
                                tp->ic_max_width = 0;
                        

                        if ((tp->inq_byte7 & INQ7_SYNC) && tp->maxoffs)
                                tp->ic_min_sync = (tp->minsync < np->minsync) ?
                                                        np->minsync : tp->minsync;
                        else 
                                tp->ic_min_sync = 255;
                        
                        tp->period   = 1;
                        tp->widedone = 1;

                        /*
                         * Enable PPR negotiation - only if Ultra3 support
                         * is accessible.
                         */

#if 0
                        if (tp->ic_max_width && (tp->ic_min_sync != 255 ))
                                tp->ppr_negotiation = 1;
#endif
                        tp->ppr_negotiation = 0;
                        if (np->features & FE_ULTRA3) {
                            if (tp->ic_max_width && (tp->ic_min_sync == 0x09))
                                tp->ppr_negotiation = 1;
                        }

                        if (!tp->ppr_negotiation)
                                cmd->ic_nego &= ~NS_PPR;
                }

                if (DEBUG_FLAGS & DEBUG_IC) {
                        printk("%s: cmd->ic_nego %d, 1st byte 0x%2X\n",
                                ncr_name(np), cmd->ic_nego, cmd->cmnd[0]);
                }

                /* Previous command recorded a parity or an initiator
                 * detected error condition. Force bus to narrow for this
                 * target. Clear flag. Negotation on request sense.
                 * Note: kernel forces 2 bus resets :o( but clears itself out. 
                 * Minor bug? in scsi_obsolete.c (ugly)
                 */
                if (np->check_integ_par) { 
                        printk("%s: Parity Error. Target set to narrow.\n",
                                ncr_name(np));
                        tp->ic_max_width = 0;
                        tp->widedone = tp->period = 0;
                }

                /* Initializing:
                 * If ic_nego == NS_PPR, we are in the initial test for
                 * PPR messaging support. If driver flag is clear, then
                 * either we don't support PPR nego (narrow or async device)
                 * or this is the second TUR and we have had a M. REJECT 
                 * or unexpected disconnect on the first PPR negotiation.  
                 * Do not negotiate, reset nego flags (in case a reset has
                 * occurred), clear ic_nego and return.
                 * General case: Kernel will clear flag on a fallback. 
                 * Do only SDTR or WDTR in the future.
                 */
                if (!tp->ppr_negotiation &&  (cmd->ic_nego == NS_PPR )) {
                        tp->ppr_negotiation = 0;
                        cmd->ic_nego &= ~NS_PPR;
                        tp->widedone = tp->period = 1;
                        return msglen;
                }
                else if (( tp->ppr_negotiation && !(cmd->ic_nego & NS_PPR )) || 
                        (!tp->ppr_negotiation &&  (cmd->ic_nego & NS_PPR )) ) {
                        tp->ppr_negotiation = 0;
                        cmd->ic_nego &= ~NS_PPR;
                }

                /*
                 * Always check the PPR nego. flag bit if ppr_negotiation
                 * is set.  If the ic_nego PPR bit is clear,
                 * there must have been a fallback. Do only
                 * WDTR / SDTR in the future.
                 */
                if ((tp->ppr_negotiation) && (!(cmd->ic_nego & NS_PPR)))
                        tp->ppr_negotiation = 0;

                /* In case of a bus reset, ncr_negotiate will reset 
                 * the flags tp->widedone and tp->period to 0, forcing
                 * a new negotiation.  Do WDTR then SDTR. If PPR, do both.
                 * Do NOT increase the period.  It is possible for the Scsi_Cmnd
                 * flags to be set to increase the period when a bus reset 
                 * occurs - we don't want to change anything.
                 */

                no_increase = 0;

                if (tp->ppr_negotiation && (!tp->widedone) && (!tp->period) ) {
                        cmd->ic_nego = NS_PPR;
                        tp->widedone = tp->period = 1;
                        no_increase = 1;
                }
                else if (!tp->widedone) {
                        cmd->ic_nego = NS_WIDE;
                        tp->widedone = 1;
                        no_increase = 1;
                }
                else if (!tp->period) {
                        cmd->ic_nego = NS_SYNC;
                        tp->period = 1;
                        no_increase = 1;
                }

                new_width = cmd->ic_nego_width & tp->ic_max_width;

                switch (cmd->ic_nego_sync) {
                case 2: /* increase the period */
                        if (!no_increase) {
                            if (tp->ic_min_sync <= 0x09)      
                                tp->ic_min_sync = 0x0A;
                            else if (tp->ic_min_sync <= 0x0A) 
                                tp->ic_min_sync = 0x0C;
                            else if (tp->ic_min_sync <= 0x0C) 
                                tp->ic_min_sync = 0x19;
                            else if (tp->ic_min_sync <= 0x19) 
                                tp->ic_min_sync *= 2;
                            else  {
                                tp->ic_min_sync = 255;
                                cmd->ic_nego_sync = 0;
                                tp->maxoffs = 0;
                            }
                        }
                        new_period  = tp->maxoffs?tp->ic_min_sync:0;
                        new_offset  = tp->maxoffs;
                        break;

                case 1: /* nego. to maximum */
                        new_period  = tp->maxoffs?tp->ic_min_sync:0;
                        new_offset  = tp->maxoffs;
                        break;

                case 0: /* nego to async */
                default:
                        new_period = 0;
                        new_offset = 0;
                        break;
                };
                

                nego = NS_NOCHANGE;
                if (tp->ppr_negotiation) { 
                        u_char options_byte = 0;

                        /*
                        ** Must make sure data is consistent.
                        ** If period is 9 and sync, must be wide and DT bit set.
                        ** else period must be larger. If the width is 0, 
                        ** reset bus to wide but increase the period to 0x0A.
                        ** Note: The strange else clause is due to the integrity check.
                        ** If fails at 0x09, wide, the I.C. code will redo at the same
                        ** speed but a narrow bus. The driver must take care of slowing
                        ** the bus speed down.
                        **
                        ** The maximum offset in ST mode is 31, in DT mode 62 (1010/1010_66 only)
                        */
                        if ( (new_period==0x09) && new_offset) {
                                if (new_width) 
                                        options_byte = 0x02;
                                else {
                                        tp->ic_min_sync = 0x0A;
                                        new_period = 0x0A;
                                        cmd->ic_nego_width = 1;
                                        new_width = 1;
                                }
                        }
                        if (!options_byte && new_offset > np->maxoffs_st)
                                new_offset = np->maxoffs_st;

                        nego = NS_PPR;
                        
                        msgptr[msglen++] = M_EXTENDED;
                        msgptr[msglen++] = 6;
                        msgptr[msglen++] = M_X_PPR_REQ;
                        msgptr[msglen++] = new_period;
                        msgptr[msglen++] = 0;
                        msgptr[msglen++] = new_offset;
                        msgptr[msglen++] = new_width;
                        msgptr[msglen++] = options_byte;

                }
                else {
                        switch (cmd->ic_nego & ~NS_PPR) {
                        case NS_WIDE:
                            /*
                            **  WDTR negotiation on if device supports
                            **  wide or if wide device forced narrow
                            **  due to a parity error. 
                            */

                            cmd->ic_nego_width &= tp->ic_max_width;

                            if (tp->ic_max_width | np->check_integ_par) {
                                nego = NS_WIDE;
                                msgptr[msglen++] = M_EXTENDED;
                                msgptr[msglen++] = 2;
                                msgptr[msglen++] = M_X_WIDE_REQ;
                                msgptr[msglen++] = new_width;
                            }
                            break;

                        case NS_SYNC:
                            /*
                            **  negotiate synchronous transfers
                            **  Target must support sync transfers.
                            **  Min. period = 0x0A, maximum offset of 31=0x1f.
                            */

                            if (tp->inq_byte7 & INQ7_SYNC) {

                                if (new_offset && (new_period < 0x0A)) {
                                        tp->ic_min_sync = 0x0A;
                                        new_period = 0x0A;
                                }
                                if (new_offset > np->maxoffs_st)
                                        new_offset = np->maxoffs_st;
                                nego = NS_SYNC;
                                msgptr[msglen++] = M_EXTENDED;
                                msgptr[msglen++] = 3;
                                msgptr[msglen++] = M_X_SYNC_REQ;
                                msgptr[msglen++] = new_period;
                                msgptr[msglen++] = new_offset;
                            }
                            else 
                                cmd->ic_nego_sync = 0;
                            break;

                        case NS_NOCHANGE:
                            break;
                        }
                }

        };

        cp->nego_status = nego;
        np->check_integ_par = 0;

        if (nego) {
                tp->nego_cp = cp;
                if (DEBUG_FLAGS & DEBUG_NEGO) {
                        ncr_print_msg(cp, nego == NS_WIDE ?
                                  "wide/narrow msgout":
                                (nego == NS_SYNC ? "sync/async msgout" : "ppr msgout"), 
                                msgptr);
                };
        };

        return msglen;
}
#endif  /* SCSI_NCR_INTEGRITY_CHECKING */

/*==========================================================
**
**
**      Prepare the next negotiation message if needed.
**
**      Fill in the part of message buffer that contains the 
**      negotiation and the nego_status field of the CCB.
**      Returns the size of the message in bytes.
**
**
**==========================================================
*/


static int ncr_prepare_nego(ncb_p np, ccb_p cp, u_char *msgptr)
{
        tcb_p tp = &np->target[cp->target];
        int msglen = 0;
        int nego = 0;
        u_char width, offset, factor, last_byte;

        if (!np->check_integrity) {
                /* If integrity checking disabled, enable PPR messaging
                 * if device supports wide, sync and ultra 3
                 */
                if (tp->ppr_negotiation == 1) /* PPR message successful */
                        tp->ppr_negotiation = 2;

                if ((tp->inq_done) && (!tp->ic_maximums_set)) {
                        tp->ic_maximums_set = 1;

                        /*
                         * Issue PPR only if board is capable
                         * and set-up for Ultra3 transfers.
                         */
                        tp->ppr_negotiation = 0;
                        if ( (np->features & FE_ULTRA3) &&
                                (tp->usrwide) && (tp->maxoffs) &&
                                (tp->minsync == 0x09) )
                                        tp->ppr_negotiation = 1;
                }
        }

        if (tp->inq_done) {
                /*
                 * Get the current width, offset and period
                 */
                ncr_get_xfer_info( np, tp, &factor,
                                                &offset, &width);

                /*
                **      negotiate wide transfers ?
                */

                if (!tp->widedone) {
                        if (tp->inq_byte7 & INQ7_WIDE16) {
                                if (tp->ppr_negotiation)
                                        nego = NS_PPR;
                                else
                                        nego = NS_WIDE;

                                width = tp->usrwide;
#ifdef  SCSI_NCR_INTEGRITY_CHECKING
                                if (tp->ic_done)
                                         width &= tp->ic_max_width;
#endif
                        } else
                                tp->widedone=1;

                };

                /*
                **      negotiate synchronous transfers?
                */

                if ((nego != NS_WIDE) && !tp->period) {
                        if (tp->inq_byte7 & INQ7_SYNC) {
                                if (tp->ppr_negotiation)
                                        nego = NS_PPR;
                                else
                                        nego = NS_SYNC;
                                
                                /* Check for async flag */
                                if (tp->maxoffs == 0) {
                                    offset = 0;
                                    factor = 0;
                                }
                                else {
                                    offset = tp->maxoffs;
                                    factor = tp->minsync;
#ifdef  SCSI_NCR_INTEGRITY_CHECKING
                                    if ((tp->ic_done) && 
                                                (factor < tp->ic_min_sync))
                                         factor = tp->ic_min_sync;
#endif
                                }

                        } else {
                                offset = 0;
                                factor = 0;
                                tp->period  =0xffff;
                                PRINT_TARGET(np, cp->target);
                                printk ("target did not report SYNC.\n");
                        };
                };
        };

        switch (nego) {
        case NS_PPR:
                /*
                ** Must make sure data is consistent.
                ** If period is 9 and sync, must be wide and DT bit set
                ** else period must be larger. 
                ** Maximum offset is 31=0x1f is ST mode, 62 if DT mode
                */
                last_byte = 0;
                if ( (factor==9) && offset) {
                        if (!width) {
                                factor = 0x0A;
                        }
                        else 
                                last_byte = 0x02;
                }
                if (!last_byte && offset > np->maxoffs_st)
                        offset = np->maxoffs_st;

                msgptr[msglen++] = M_EXTENDED;
                msgptr[msglen++] = 6;
                msgptr[msglen++] = M_X_PPR_REQ;
                msgptr[msglen++] = factor;
                msgptr[msglen++] = 0;
                msgptr[msglen++] = offset;
                msgptr[msglen++] = width;
                msgptr[msglen++] = last_byte;
                break;
        case NS_SYNC:
                /*
                ** Never negotiate faster than Ultra 2 (25ns periods)
                */
                if (offset && (factor < 0x0A)) {
                        factor = 0x0A;
                        tp->minsync = 0x0A;
                }
                if (offset > np->maxoffs_st)
                        offset = np->maxoffs_st;

                msgptr[msglen++] = M_EXTENDED;
                msgptr[msglen++] = 3;
                msgptr[msglen++] = M_X_SYNC_REQ;
                msgptr[msglen++] = factor;
                msgptr[msglen++] = offset;
                break;
        case NS_WIDE:
                msgptr[msglen++] = M_EXTENDED;
                msgptr[msglen++] = 2;
                msgptr[msglen++] = M_X_WIDE_REQ;
                msgptr[msglen++] = width;
                break;
        };

        cp->nego_status = nego;

        if (nego) {
                tp->nego_cp = cp;
                if (DEBUG_FLAGS & DEBUG_NEGO) {
                        ncr_print_msg(cp, nego == NS_WIDE ?
                                  "wide msgout":
                                (nego == NS_SYNC ? "sync msgout" : "ppr msgout"), 
                                msgptr);
                };
        };

        return msglen;
}

/*==========================================================
**
**
**      Start execution of a SCSI command.
**      This is called from the generic SCSI driver.
**
**
**==========================================================
*/
static int ncr_queue_command (ncb_p np, Scsi_Cmnd *cmd)
{
/*      Scsi_Device        *device    = cmd->device; */
        tcb_p tp                      = &np->target[cmd->device->id];
        lcb_p lp                      = ncr_lp(np, tp, cmd->device->lun);
        ccb_p cp;

        u_char  idmsg, *msgptr;
        u_int   msglen;
        int     direction;
        u_int32 lastp, goalp;

        /*---------------------------------------------
        **
        **      Some shortcuts ...
        **
        **---------------------------------------------
        */
        if ((cmd->device->id == np->myaddr        ) ||
                (cmd->device->id >= MAX_TARGET) ||
                (cmd->device->lun    >= MAX_LUN   )) {
                return(DID_BAD_TARGET);
        }

        /*---------------------------------------------
        **
        **      Complete the 1st TEST UNIT READY command
        **      with error condition if the device is 
        **      flagged NOSCAN, in order to speed up 
        **      the boot.
        **
        **---------------------------------------------
        */
        if ((cmd->cmnd[0] == 0 || cmd->cmnd[0] == 0x12) && 
            (tp->usrflag & UF_NOSCAN)) {
                tp->usrflag &= ~UF_NOSCAN;
                return DID_BAD_TARGET;
        }

        if (DEBUG_FLAGS & DEBUG_TINY) {
                PRINT_ADDR(cmd);
                printk ("CMD=%x ", cmd->cmnd[0]);
        }

        /*---------------------------------------------------
        **
        **      Assign a ccb / bind cmd.
        **      If resetting, shorten settle_time if necessary
        **      in order to avoid spurious timeouts.
        **      If resetting or no free ccb,
        **      insert cmd into the waiting list.
        **
        **----------------------------------------------------
        */
        if (np->settle_time && cmd->timeout_per_command >= HZ) {
                u_long tlimit = ktime_get(cmd->timeout_per_command - HZ);
                if (ktime_dif(np->settle_time, tlimit) > 0)
                        np->settle_time = tlimit;
        }

        if (np->settle_time || !(cp=ncr_get_ccb (np, cmd->device->id, cmd->device->lun))) {
                insert_into_waiting_list(np, cmd);
                return(DID_OK);
        }
        cp->cmd = cmd;

        /*---------------------------------------------------
        **
        **      Enable tagged queue if asked by scsi ioctl
        **
        **----------------------------------------------------
        */
#if 0   /* This stuff was only useful for linux-1.2.13 */
        if (lp && !lp->numtags && cmd->device && cmd->device->tagged_queue) {
                lp->numtags = tp->usrtags;
                ncr_setup_tags (np, cp->target, cp->lun);
        }
#endif

        /*----------------------------------------------------
        **
        **      Build the identify / tag / sdtr message
        **
        **----------------------------------------------------
        */

        idmsg = M_IDENTIFY | cp->lun;

        if (cp ->tag != NO_TAG || (lp && !(tp->usrflag & UF_NODISC)))
                idmsg |= 0x40;

        msgptr = cp->scsi_smsg;
        msglen = 0;
        msgptr[msglen++] = idmsg;

        if (cp->tag != NO_TAG) {
                char order = np->order;

                /*
                **      Force ordered tag if necessary to avoid timeouts 
                **      and to preserve interactivity.
                */
                if (lp && ktime_exp(lp->tags_stime)) {
                        lp->tags_si = !(lp->tags_si);
                        if (lp->tags_sum[lp->tags_si]) {
                                order = M_ORDERED_TAG;
                                if ((DEBUG_FLAGS & DEBUG_TAGS)||bootverbose>0){ 
                                        PRINT_ADDR(cmd);
                                        printk("ordered tag forced.\n");
                                }
                        }
                        lp->tags_stime = ktime_get(3*HZ);
                }

                if (order == 0) {
                        /*
                        **      Ordered write ops, unordered read ops.
                        */
                        switch (cmd->cmnd[0]) {
                        case 0x08:  /* READ_SMALL (6) */
                        case 0x28:  /* READ_BIG  (10) */
                        case 0xa8:  /* READ_HUGE (12) */
                                order = M_SIMPLE_TAG;
                                break;
                        default:
                                order = M_ORDERED_TAG;
                        }
                }
                msgptr[msglen++] = order;
                /*
                **      For less than 128 tags, actual tags are numbered 
                **      1,3,5,..2*MAXTAGS+1,since we may have to deal 
                **      with devices that have problems with #TAG 0 or too 
                **      great #TAG numbers. For more tags (up to 256), 
                **      we use directly our tag number.
                */
#if MAX_TASKS > (512/4)
                msgptr[msglen++] = cp->tag;
#else
                msgptr[msglen++] = (cp->tag << 1) + 1;
#endif
        }

        cp->host_flags  = 0;

        /*----------------------------------------------------
        **
        **      Build the data descriptors
        **
        **----------------------------------------------------
        */

        direction = scsi_data_direction(cmd);
        if (direction != SCSI_DATA_NONE) {
                cp->segments = np->scatter (np, cp, cp->cmd);
                if (cp->segments < 0) {
                        ncr_free_ccb(np, cp);
                        return(DID_ERROR);
                }
        }
        else {
                cp->data_len = 0;
                cp->segments = 0;
        }

        /*---------------------------------------------------
        **
        **      negotiation required?
        **
        **      (nego_status is filled by ncr_prepare_nego())
        **
        **---------------------------------------------------
        */

        cp->nego_status = 0;

#ifdef  SCSI_NCR_INTEGRITY_CHECKING
        if ((np->check_integrity && tp->ic_done) || !np->check_integrity) {
                 if ((!tp->widedone || !tp->period) && !tp->nego_cp && lp) {
                        msglen += ncr_prepare_nego (np, cp, msgptr + msglen);
                 }
        }
        else if (np->check_integrity && (cmd->ic_in_progress)) { 
                msglen += ncr_ic_nego (np, cp, cmd, msgptr + msglen);
        }
        else if (np->check_integrity && cmd->ic_complete) {
                u_long current_period;
                u_char current_offset, current_width, current_factor;

                ncr_get_xfer_info (np, tp, &current_factor,
                                        &current_offset, &current_width);

                tp->ic_max_width = current_width;
                tp->ic_min_sync  = current_factor;

                if      (current_factor == 9)   current_period = 125;
                else if (current_factor == 10)  current_period = 250;
                else if (current_factor == 11)  current_period = 303;
                else if (current_factor == 12)  current_period = 500;
                else                    current_period = current_factor * 40;

                /*
                 * Negotiation for this target is complete. Update flags.
                 */
                tp->period = current_period;
                tp->widedone = 1;
                tp->ic_done = 1;

                printk("%s: Integrity Check Complete: \n", ncr_name(np)); 

                printk("%s: %s %s SCSI", ncr_name(np), 
                                current_offset?"SYNC":"ASYNC",
                                tp->ic_max_width?"WIDE":"NARROW");
                if (current_offset) {
                        u_long mbs = 10000 * (tp->ic_max_width + 1); 

                        printk(" %d.%d  MB/s", 
                                (int) (mbs / current_period), (int) (mbs % current_period));

                        printk(" (%d ns, %d offset)\n", 
                                  (int) current_period/10, current_offset);
                }
                else 
                        printk(" %d MB/s. \n ", (tp->ic_max_width+1)*5);
        }
#else
        if ((!tp->widedone || !tp->period) && !tp->nego_cp && lp) {
                msglen += ncr_prepare_nego (np, cp, msgptr + msglen);
        }
#endif  /* SCSI_NCR_INTEGRITY_CHECKING */


        /*----------------------------------------------------
        **
        **      Determine xfer direction.
        **
        **----------------------------------------------------
        */
        if (!cp->data_len)
                direction = SCSI_DATA_NONE;

        /*
        **      If data direction is UNKNOWN, speculate DATA_READ 
        **      but prepare alternate pointers for WRITE in case 
        **      of our speculation will be just wrong.
        **      SCRIPTS will swap values if needed.
        */
        switch(direction) {
        case SCSI_DATA_UNKNOWN:
        case SCSI_DATA_WRITE:
                goalp = NCB_SCRIPT_PHYS (np, data_out2) + 8;
                lastp = goalp - 8 - (cp->segments * (SCR_SG_SIZE*4));
                if (direction != SCSI_DATA_UNKNOWN)
                        break;
                cp->phys.header.wgoalp  = cpu_to_scr(goalp);
                cp->phys.header.wlastp  = cpu_to_scr(lastp);
                /* fall through */
        case SCSI_DATA_READ:
                cp->host_flags |= HF_DATA_IN;
                goalp = NCB_SCRIPT_PHYS (np, data_in2) + 8;
                lastp = goalp - 8 - (cp->segments * (SCR_SG_SIZE*4));
                break;
        default:
        case SCSI_DATA_NONE:
                lastp = goalp = NCB_SCRIPTH_PHYS (np, no_data);
                break;
        }

        /*
        **      Set all pointers values needed by SCRIPTS.
        **      If direction is unknown, start at data_io.
        */
        cp->phys.header.lastp = cpu_to_scr(lastp);
        cp->phys.header.goalp = cpu_to_scr(goalp);

        if (direction == SCSI_DATA_UNKNOWN)
                cp->phys.header.savep = 
                        cpu_to_scr(NCB_SCRIPTH_PHYS (np, data_io));
        else
                cp->phys.header.savep= cpu_to_scr(lastp);

        /*
        **      Save the initial data pointer in order to be able 
        **      to redo the command.
        **      We also have to save the initial lastp, since it 
        **      will be changed to DATA_IO if we don't know the data 
        **      direction and the device completes the command with 
        **      QUEUE FULL status (without entering the data phase).
        */
        cp->startp = cp->phys.header.savep;
        cp->lastp0 = cp->phys.header.lastp;

        /*----------------------------------------------------
        **
        **      fill in ccb
        **
        **----------------------------------------------------
        **
        **
        **      physical -> virtual backlink
        **      Generic SCSI command
        */

        /*
        **      Startqueue
        */
        cp->phys.header.go.start   = cpu_to_scr(NCB_SCRIPT_PHYS (np,select));
        cp->phys.header.go.restart = cpu_to_scr(NCB_SCRIPT_PHYS (np,resel_dsa));
        /*
        **      select
        */
        cp->phys.select.sel_id          = cp->target;
        cp->phys.select.sel_scntl3      = tp->wval;
        cp->phys.select.sel_sxfer       = tp->sval;
        cp->phys.select.sel_scntl4      = tp->uval;
        /*
        **      message
        */
        cp->phys.smsg.addr      = cpu_to_scr(CCB_PHYS (cp, scsi_smsg));
        cp->phys.smsg.size      = cpu_to_scr(msglen);

        /*
        **      command
        */
        memcpy(cp->cdb_buf, cmd->cmnd, MIN(cmd->cmd_len, sizeof(cp->cdb_buf)));
        cp->phys.cmd.addr       = cpu_to_scr(CCB_PHYS (cp, cdb_buf[0]));
        cp->phys.cmd.size       = cpu_to_scr(cmd->cmd_len);

        /*
        **      status
        */
        cp->actualquirks        = tp->quirks;
        cp->host_status         = cp->nego_status ? HS_NEGOTIATE : HS_BUSY;
        cp->scsi_status         = S_ILLEGAL;
        cp->xerr_status         = 0;
        cp->extra_bytes         = 0;

        /*
        **      extreme data pointer.
        **      shall be positive, so -1 is lower than lowest.:)
        */
        cp->ext_sg  = -1;
        cp->ext_ofs = 0;

        /*----------------------------------------------------
        **
        **      Critical region: start this job.
        **
        **----------------------------------------------------
        */

        /*
        **      activate this job.
        */

        /*
        **      insert next CCBs into start queue.
        **      2 max at a time is enough to flush the CCB wait queue.
        */
        if (lp)
                ncr_start_next_ccb(np, lp, 2);
        else
                ncr_put_start_queue(np, cp);

        /*
        **      Command is successfully queued.
        */

        return(DID_OK);
}


/*==========================================================
**
**
**      Insert a CCB into the start queue and wake up the 
**      SCRIPTS processor.
**
**
**==========================================================
*/

static void ncr_start_next_ccb(ncb_p np, lcb_p lp, int maxn)
{
        XPT_QUEHEAD *qp;
        ccb_p cp;

        while (maxn-- && lp->queuedccbs < lp->queuedepth) {
                qp = xpt_remque_head(&lp->wait_ccbq);
                if (!qp)
                        break;
                ++lp->queuedccbs;
                cp = xpt_que_entry(qp, struct ccb, link_ccbq);
                xpt_insque_tail(qp, &lp->busy_ccbq);
                lp->tasktbl[cp->tag == NO_TAG ? 0 : cp->tag] =
                        cpu_to_scr(cp->p_ccb);
                ncr_put_start_queue(np, cp);
        }
}

static void ncr_put_start_queue(ncb_p np, ccb_p cp)
{
        u_short qidx;

#ifdef SCSI_NCR_IARB_SUPPORT
        /*
        **      If the previously queued CCB is not yet done, 
        **      set the IARB hint. The SCRIPTS will go with IARB 
        **      for this job when starting the previous one.
        **      We leave devices a chance to win arbitration by 
        **      not using more than 'iarb_max' consecutive 
        **      immediate arbitrations.
        */
        if (np->last_cp && np->iarb_count < np->iarb_max) {
                np->last_cp->host_flags |= HF_HINT_IARB;
                ++np->iarb_count;
        }
        else
                np->iarb_count = 0;
        np->last_cp = cp;
#endif
        
        /*
        **      insert into start queue.
        */
        qidx = np->squeueput + 2;
        if (qidx >= MAX_START*2) qidx = 0;

        np->squeue [qidx]          = cpu_to_scr(np->p_idletask);
        MEMORY_BARRIER();
        np->squeue [np->squeueput] = cpu_to_scr(cp->p_ccb);

        np->squeueput = qidx;
        cp->queued = 1;

        if (DEBUG_FLAGS & DEBUG_QUEUE)
                printk ("%s: queuepos=%d.\n", ncr_name (np), np->squeueput);

        /*
        **      Script processor may be waiting for reselect.
        **      Wake it up.
        */
        MEMORY_BARRIER();
        OUTB (nc_istat, SIGP|np->istat_sem);
}


/*==========================================================
**
**      Soft reset the chip.
**
**      Some 896 and 876 chip revisions may hang-up if we set 
**      the SRST (soft reset) bit at the wrong time when SCRIPTS 
**      are running.
**      So, we need to abort the current operation prior to 
**      soft resetting the chip.
**
**==========================================================
*/

static void ncr_chip_reset (ncb_p np)
{
        OUTB (nc_istat, SRST);
        UDELAY (10);
        OUTB (nc_istat, 0);
}

static void ncr_soft_reset(ncb_p np)
{
        u_char istat;
        int i;

        if (!(np->features & FE_ISTAT1) || !(INB (nc_istat1) & SRUN))
                goto do_chip_reset;

        OUTB (nc_istat, CABRT);
        for (i = 100000 ; i ; --i) {
                istat = INB (nc_istat);
                if (istat & SIP) {
                        INW (nc_sist);
                }
                else if (istat & DIP) {
                        if (INB (nc_dstat) & ABRT)
                                break;
                }
                UDELAY(5);
        }
        OUTB (nc_istat, 0);
        if (!i)
                printk("%s: unable to abort current chip operation, "
                       "ISTAT=0x%02x.\n", ncr_name(np), istat);
do_chip_reset:
        ncr_chip_reset(np);
}

/*==========================================================
**
**
**      Start reset process.
**      The interrupt handler will reinitialize the chip.
**      The timeout handler will wait for settle_time before 
**      clearing it and so resuming command processing.
**
**
**==========================================================
*/
static void ncr_start_reset(ncb_p np)
{
        (void) ncr_reset_scsi_bus(np, 1, driver_setup.settle_delay);
}
 
static int ncr_reset_scsi_bus(ncb_p np, int enab_int, int settle_delay)
{
        u_int32 term;
        int retv = 0;

        np->settle_time = ktime_get(settle_delay * HZ);

        if (bootverbose > 1)
                printk("%s: resetting, "
                        "command processing suspended for %d seconds\n",
                        ncr_name(np), settle_delay);

        ncr_soft_reset(np);     /* Soft reset the chip */
        UDELAY (2000);  /* The 895/6 need time for the bus mode to settle */
        if (enab_int)
                OUTW (nc_sien, RST);
        /*
        **      Enable Tolerant, reset IRQD if present and 
        **      properly set IRQ mode, prior to resetting the bus.
        */
        OUTB (nc_stest3, TE);
        OUTB (nc_dcntl, (np->rv_dcntl & IRQM));
        OUTB (nc_scntl1, CRST);
        UDELAY (200);

        if (!driver_setup.bus_check)
                goto out;
        /*
        **      Check for no terminators or SCSI bus shorts to ground.
        **      Read SCSI data bus, data parity bits and control signals.
        **      We are expecting RESET to be TRUE and other signals to be 
        **      FALSE.
        */
        term =  INB(nc_sstat0);
        term =  ((term & 2) << 7) + ((term & 1) << 17); /* rst sdp0 */
        term |= ((INB(nc_sstat2) & 0x01) << 26) |       /* sdp1     */
                ((INW(nc_sbdl) & 0xff)   << 9)  |       /* d7-0     */
                ((INW(nc_sbdl) & 0xff00) << 10) |       /* d15-8    */
                INB(nc_sbcl);   /* req ack bsy sel atn msg cd io    */

        if (!(np->features & FE_WIDE))
                term &= 0x3ffff;

        if (term != (2<<7)) {
                printk("%s: suspicious SCSI data while resetting the BUS.\n",
                        ncr_name(np));
                printk("%s: %sdp0,d7-0,rst,req,ack,bsy,sel,atn,msg,c/d,i/o = "
                        "0x%lx, expecting 0x%lx\n",
                        ncr_name(np),
                        (np->features & FE_WIDE) ? "dp1,d15-8," : "",
                        (u_long)term, (u_long)(2<<7));
                if (driver_setup.bus_check == 1)
                        retv = 1;
        }
out:
        OUTB (nc_scntl1, 0);
        return retv;
}

/*==========================================================
**
**
**      Reset the SCSI BUS.
**      This is called from the generic SCSI driver.
**
**
**==========================================================
*/
static int ncr_reset_bus (ncb_p np, Scsi_Cmnd *cmd, int sync_reset)
{
/*      Scsi_Device        *device    = cmd->device; */
        ccb_p cp;
        int found;

/*
 * Return immediately if reset is in progress.
 */
        if (np->settle_time) {
                return SCSI_RESET_PUNT;
        }
/*
 * Start the reset process.
 * The script processor is then assumed to be stopped.
 * Commands will now be queued in the waiting list until a settle 
 * delay of 2 seconds will be completed.
 */
        ncr_start_reset(np);
/*
 * First, look in the wakeup list
 */
        for (found=0, cp=np->ccbc; cp; cp=cp->link_ccb) {
                /*
                **      look for the ccb of this command.
                */
                if (cp->host_status == HS_IDLE) continue;
                if (cp->cmd == cmd) {
                        found = 1;
                        break;
                }
        }
/*
 * Then, look in the waiting list
 */
        if (!found && retrieve_from_waiting_list(0, np, cmd))
                found = 1;
/*
 * Wake-up all awaiting commands with DID_RESET.
 */
        reset_waiting_list(np);
/*
 * Wake-up all pending commands with HS_RESET -> DID_RESET.
 */
        ncr_wakeup(np, HS_RESET);
/*
 * If the involved command was not in a driver queue, and the 
 * scsi driver told us reset is synchronous, and the command is not 
 * currently in the waiting list, complete it with DID_RESET status,
 * in order to keep it alive.
 */
        if (!found && sync_reset && !retrieve_from_waiting_list(0, np, cmd)) {
                SetScsiResult(cmd, DID_RESET, 0);
                ncr_queue_done_cmd(np, cmd);
        }

        return SCSI_RESET_SUCCESS;
}

/*==========================================================
**
**
**      Abort an SCSI command.
**      This is called from the generic SCSI driver.
**
**
**==========================================================
*/
static int ncr_abort_command (ncb_p np, Scsi_Cmnd *cmd)
{
/*      Scsi_Device        *device    = cmd->device; */
        ccb_p cp;

/*
 * First, look for the scsi command in the waiting list
 */
        if (remove_from_waiting_list(np, cmd)) {
                SetScsiAbortResult(cmd);
                ncr_queue_done_cmd(np, cmd);
                return SCSI_ABORT_SUCCESS;
        }

/*
 * Then, look in the wakeup list
 */
        for (cp=np->ccbc; cp; cp=cp->link_ccb) {
                /*
                **      look for the ccb of this command.
                */
                if (cp->host_status == HS_IDLE) continue;
                if (cp->cmd == cmd)
                        break;
        }

        if (!cp) {
                return SCSI_ABORT_NOT_RUNNING;
        }

        /*
        **      Keep track we have to abort this job.
        */
        cp->to_abort = 1;

        /*
        **      Tell the SCRIPTS processor to stop 
        **      and synchronize with us.
        */
        np->istat_sem = SEM;

        /*
        **      If there are no requests, the script
        **      processor will sleep on SEL_WAIT_RESEL.
        **      Let's wake it up, since it may have to work.
        */
        OUTB (nc_istat, SIGP|SEM);

        /*
        **      Tell user we are working for him.
        */
        return SCSI_ABORT_PENDING;
}

/*==========================================================
**
**      Linux release module stuff.
**
**      Called before unloading the module
**      Detach the host.
**      We have to free resources and halt the NCR chip
**
**==========================================================
*/

static int ncr_detach(ncb_p np)
{
        int i;

        printk("%s: detaching ...\n", ncr_name(np));

/*
**      Stop the ncr_timeout process
**      Set release_stage to 1 and wait that ncr_timeout() set it to 2.
*/
        np->release_stage = 1;
        for (i = 50 ; i && np->release_stage != 2 ; i--) MDELAY (100);
        if (np->release_stage != 2)
                printk("%s: the timer seems to be already stopped\n",
                        ncr_name(np));
        else np->release_stage = 2;

/*
**      Reset NCR chip.
**      We should use ncr_soft_reset(), but we donnot want to do 
**      so, since we may not be safe if interrupts occur.
*/

        printk("%s: resetting chip\n", ncr_name(np));
        ncr_chip_reset(np);

/*
**      Restore bios setting for automatic clock detection.
*/
        OUTB(nc_dmode,  np->sv_dmode);
        OUTB(nc_dcntl,  np->sv_dcntl);
        OUTB(nc_ctest3, np->sv_ctest3);
        OUTB(nc_ctest4, np->sv_ctest4);
        OUTB(nc_ctest5, np->sv_ctest5);
        OUTB(nc_gpcntl, np->sv_gpcntl);
        OUTB(nc_stest2, np->sv_stest2);

        ncr_selectclock(np, np->sv_scntl3);
/*
**      Free host resources
*/
        ncr_free_resources(np);

        return 1;
}

/*==========================================================
**
**
**      Complete execution of a SCSI command.
**      Signal completion to the generic SCSI driver.
**
**
**==========================================================
*/

void ncr_complete (ncb_p np, ccb_p cp)
{
        Scsi_Cmnd *cmd;
        tcb_p tp;
        lcb_p lp;

        /*
        **      Sanity check
        */
        if (!cp || !cp->cmd)
                return;

        /*
        **      Print some debugging info.
        */

        if (DEBUG_FLAGS & DEBUG_TINY)
                printk ("CCB=%lx STAT=%x/%x\n", (unsigned long)cp,
                        cp->host_status,cp->scsi_status);

        /*
        **      Get command, target and lun pointers.
        */

        cmd = cp->cmd;
        cp->cmd = NULL;
        tp = &np->target[cp->target];
        lp = ncr_lp(np, tp, cp->lun);

        /*
        **      We donnot queue more than 1 ccb per target 
        **      with negotiation at any time. If this ccb was 
        **      used for negotiation, clear this info in the tcb.
        */

        if (cp == tp->nego_cp)
                tp->nego_cp = 0;

#ifdef SCSI_NCR_IARB_SUPPORT
        /*
        **      We just complete the last queued CCB.
        **      Clear this info that is no more relevant.
        */
        if (cp == np->last_cp)
                np->last_cp = 0;
#endif

        /*
        **      If auto-sense performed, change scsi status, 
        **      Otherwise, compute the residual.
        */
        if (cp->host_flags & HF_AUTO_SENSE) {
                cp->scsi_status = cp->sv_scsi_status;
                cp->xerr_status = cp->sv_xerr_status;
        }
        else {
                cp->resid = 0;
                if (cp->xerr_status ||
                    cp->phys.header.lastp != cp->phys.header.goalp)
                        cp->resid = ncr_compute_residual(np, cp);
        }

        /*
        **      Check for extended errors.
        */

        if (cp->xerr_status) {
                if (cp->xerr_status & XE_PARITY_ERR) {
                        PRINT_ADDR(cmd);
                        printk ("unrecovered SCSI parity error.\n");
                }
                if (cp->xerr_status & XE_EXTRA_DATA) {
                        PRINT_ADDR(cmd);
                        printk ("extraneous data discarded.\n");
                }
                if (cp->xerr_status & XE_BAD_PHASE) {
                        PRINT_ADDR(cmd);
                        printk ("illegal scsi phase (4/5).\n");
                }
                if (cp->xerr_status & XE_SODL_UNRUN) {
                        PRINT_ADDR(cmd);
                        printk ("ODD transfer in DATA OUT phase.\n");
                }
                if (cp->xerr_status & XE_SWIDE_OVRUN){
                        PRINT_ADDR(cmd);
                        printk ("ODD transfer in DATA IN phase.\n");
                }

                if (cp->host_status==HS_COMPLETE)
                        cp->host_status = HS_FAIL;
        }

        /*
        **      Print out any error for debugging purpose.
        */
        if (DEBUG_FLAGS & (DEBUG_RESULT|DEBUG_TINY)) {
                if (cp->host_status!=HS_COMPLETE || cp->scsi_status!=S_GOOD ||
                    cp->resid) {
                        PRINT_ADDR(cmd);
                        printk ("ERROR: cmd=%x host_status=%x scsi_status=%x "
                                "data_len=%d residual=%d\n",
                                cmd->cmnd[0], cp->host_status, cp->scsi_status,
                                cp->data_len, cp->resid);
                }
        }

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,3,99)
        /*
        **      Move residual byte count to user structure.
        */
        cmd->resid = cp->resid;
#endif
        /*
        **      Check the status.
        */
        if (   (cp->host_status == HS_COMPLETE)
                && (cp->scsi_status == S_GOOD ||
                    cp->scsi_status == S_COND_MET)) {
                /*
                **      All went well (GOOD status).
                **      CONDITION MET status is returned on 
                **      `Pre-Fetch' or `Search data' success.
                */
                SetScsiResult(cmd, DID_OK, cp->scsi_status);

                /*
                **      Allocate the lcb if not yet.
                */
                if (!lp)
                        ncr_alloc_lcb (np, cp->target, cp->lun);

                /*
                **      On standard INQUIRY response (EVPD and CmDt 
                **      not set), setup logical unit according to 
                **      announced capabilities (we need the 1rst 8 bytes).
                */
                if (cmd->cmnd[0] == 0x12 && !(cmd->cmnd[1] & 0x3) &&
                    cmd->request_bufflen - cp->resid > 7 && !cmd->use_sg) {
                        sync_scsi_data(np, cmd);        /* SYNC the data */
                        ncr_setup_lcb (np, cp->target, cp->lun,
                                       (char *) cmd->request_buffer);
                }

                /*
                **      If tags was reduced due to queue full,
                **      increase tags if 1000 good status received.
                */
                if (lp && lp->usetags && lp->numtags < lp->maxtags) {
                        ++lp->num_good;
                        if (lp->num_good >= 1000) {
                                lp->num_good = 0;
                                ++lp->numtags;
                                ncr_setup_tags (np, cp->target, cp->lun);
                        }
                }
        } else if ((cp->host_status == HS_COMPLETE)
                && (cp->scsi_status == S_CHECK_COND)) {
                /*
                **   Check condition code
                */
                SetScsiResult(cmd, DID_OK, S_CHECK_COND);

                if (DEBUG_FLAGS & (DEBUG_RESULT|DEBUG_TINY)) {
                        PRINT_ADDR(cmd);
                        ncr_printl_hex("sense data:", cmd->sense_buffer, 14);
                }
        } else if ((cp->host_status == HS_COMPLETE)
                && (cp->scsi_status == S_CONFLICT)) {
                /*
                **   Reservation Conflict condition code
                */
                SetScsiResult(cmd, DID_OK, S_CONFLICT);

        } else if ((cp->host_status == HS_COMPLETE)
                && (cp->scsi_status == S_BUSY ||
                    cp->scsi_status == S_QUEUE_FULL)) {

                /*
                **   Target is busy.
                */
                SetScsiResult(cmd, DID_OK, cp->scsi_status);

        } else if ((cp->host_status == HS_SEL_TIMEOUT)
                || (cp->host_status == HS_TIMEOUT)) {

                /*
                **   No response
                */
                SetScsiResult(cmd, DID_TIME_OUT, cp->scsi_status);

        } else if (cp->host_status == HS_RESET) {

                /*
                **   SCSI bus reset
                */
                SetScsiResult(cmd, DID_RESET, cp->scsi_status);

        } else if (cp->host_status == HS_ABORTED) {

                /*
                **   Transfer aborted
                */
                SetScsiAbortResult(cmd);

        } else {
                int did_status;

                /*
                **  Other protocol messes
                */
                PRINT_ADDR(cmd);
                printk ("COMMAND FAILED (%x %x) @%p.\n",
                        cp->host_status, cp->scsi_status, cp);

                did_status = DID_ERROR;
                if (cp->xerr_status & XE_PARITY_ERR)
                        did_status = DID_PARITY;

                SetScsiResult(cmd, did_status, cp->scsi_status);
        }

        /*
        **      trace output
        */

        if (tp->usrflag & UF_TRACE) {
                PRINT_ADDR(cmd);
                printk (" CMD:");
                ncr_print_hex(cmd->cmnd, cmd->cmd_len);

                if (cp->host_status==HS_COMPLETE) {
                        switch (cp->scsi_status) {
                        case S_GOOD:
                                printk ("  GOOD");
                                break;
                        case S_CHECK_COND:
                                printk ("  SENSE:");
                                ncr_print_hex(cmd->sense_buffer, 14);
                                break;
                        default:
                                printk ("  STAT: %x\n", cp->scsi_status);
                                break;
                        }
                } else printk ("  HOSTERROR: %x", cp->host_status);
                printk ("\n");
        }

        /*
        **      Free this ccb
        */
        ncr_free_ccb (np, cp);

        /*
        **      requeue awaiting scsi commands for this lun.
        */
        if (lp && lp->queuedccbs < lp->queuedepth &&
            !xpt_que_empty(&lp->wait_ccbq))
                ncr_start_next_ccb(np, lp, 2);

        /*
        **      requeue awaiting scsi commands for this controller.
        */
        if (np->waiting_list)
                requeue_waiting_list(np);

        /*
        **      signal completion to generic driver.
        */
        ncr_queue_done_cmd(np, cmd);
}

/*==========================================================
**
**
**      Signal all (or one) control block done.
**
**
**==========================================================
*/

/*
**      The NCR has completed CCBs.
**      Look at the DONE QUEUE.
**
**      On architectures that may reorder LOAD/STORE operations, 
**      a memory barrier may be needed after the reading of the 
**      so-called `flag' and prior to dealing with the data.
*/
int ncr_wakeup_done (ncb_p np)
{
        ccb_p cp;
        int i, n;
        u_long dsa;

        n = 0;
        i = np->dqueueget;
        while (1) {
                dsa = scr_to_cpu(np->dqueue[i]);
                if (!dsa)
                        break;
                np->dqueue[i] = 0;
                if ((i = i+2) >= MAX_START*2)
                        i = 0;

                cp = ncr_ccb_from_dsa(np, dsa);
                if (cp) {
                        MEMORY_BARRIER();
                        ncr_complete (np, cp);
                        ++n;
                }
                else
                        printk (KERN_ERR "%s: bad DSA (%lx) in done queue.\n",
                                ncr_name(np), dsa);
        }
        np->dqueueget = i;

        return n;
}

/*
**      Complete all active CCBs.
*/
void ncr_wakeup (ncb_p np, u_long code)
{
        ccb_p cp = np->ccbc;

        while (cp) {
                if (cp->host_status != HS_IDLE) {
                        cp->host_status = code;
                        ncr_complete (np, cp);
                }
                cp = cp->link_ccb;
        }
}

/*==========================================================
**
**
**      Start NCR chip.
**
**
**==========================================================
*/

void ncr_init (ncb_p np, int reset, char * msg, u_long code)
{
        int     i;
        u_long  phys;

        /*
        **      Reset chip if asked, otherwise just clear fifos.
        */

        if (reset)
                ncr_soft_reset(np);
        else {
                OUTB (nc_stest3, TE|CSF);
                OUTONB (nc_ctest3, CLF);
        }
 
        /*
        **      Message.
        */

        if (msg) printk (KERN_INFO "%s: restart (%s).\n", ncr_name (np), msg);

        /*
        **      Clear Start Queue
        */
        phys = np->p_squeue;
        np->queuedepth = MAX_START - 1; /* 1 entry needed as end marker */
        for (i = 0; i < MAX_START*2; i += 2) {
                np->squeue[i]   = cpu_to_scr(np->p_idletask);
                np->squeue[i+1] = cpu_to_scr(phys + (i+2)*4);
        }
        np->squeue[MAX_START*2-1] = cpu_to_scr(phys);


        /*
        **      Start at first entry.
        */
        np->squeueput = 0;
        np->scripth0->startpos[0] = cpu_to_scr(phys);

        /*
        **      Clear Done Queue
        */
        phys = vtobus(np->dqueue);
        for (i = 0; i < MAX_START*2; i += 2) {
                np->dqueue[i]   = 0;
                np->dqueue[i+1] = cpu_to_scr(phys + (i+2)*4);
        }
        np->dqueue[MAX_START*2-1] = cpu_to_scr(phys);

        /*
        **      Start at first entry.
        */
        np->scripth0->done_pos[0] = cpu_to_scr(phys);
        np->dqueueget = 0;

        /*
        **      Wakeup all pending jobs.
        */
        ncr_wakeup (np, code);

        /*
        **      Init chip.
        */

        OUTB (nc_istat,  0x00   );      /*  Remove Reset, abort */
        UDELAY (2000);  /* The 895 needs time for the bus mode to settle */

        OUTB (nc_scntl0, np->rv_scntl0 | 0xc0);
                                        /*  full arb., ena parity, par->ATN  */
        OUTB (nc_scntl1, 0x00);         /*  odd parity, and remove CRST!! */

        ncr_selectclock(np, np->rv_scntl3);     /* Select SCSI clock */

        OUTB (nc_scid  , RRE|np->myaddr);       /* Adapter SCSI address */
        OUTW (nc_respid, 1ul<<np->myaddr);      /* Id to respond to */
        OUTB (nc_istat , SIGP   );              /*  Signal Process */
        OUTB (nc_dmode , np->rv_dmode);         /* Burst length, dma mode */
        OUTB (nc_ctest5, np->rv_ctest5);        /* Large fifo + large burst */

        OUTB (nc_dcntl , NOCOM|np->rv_dcntl);   /* Protect SFBR */
        OUTB (nc_ctest3, np->rv_ctest3);        /* Write and invalidate */
        OUTB (nc_ctest4, np->rv_ctest4);        /* Master parity checking */

        if ((np->device_id != PCI_DEVICE_ID_LSI_53C1010) &&
                (np->device_id != PCI_DEVICE_ID_LSI_53C1010_66)){
                OUTB (nc_stest2, EXT|np->rv_stest2); 
                /* Extended Sreq/Sack filtering, not supported in C1010/C1010_66 */
        }
        OUTB (nc_stest3, TE);                   /* TolerANT enable */
        OUTB (nc_stime0, 0x0c);                 /* HTH disabled  STO 0.25 sec */

        /*
        **      DEL 441 - 53C876 Rev 5 - Part Number 609-0392787/2788 - ITEM 2.
        **      Disable overlapped arbitration for all dual-function 
        **      devices, regardless revision id.
        **      We may consider it is a post-chip-design feature. ;-)
        **
        **      Errata applies to all 896 and 1010 parts.
        */
        if (np->device_id == PCI_DEVICE_ID_NCR_53C875)
                OUTB (nc_ctest0, (1<<5));
        else if (np->device_id == PCI_DEVICE_ID_NCR_53C896  ||
                 np->device_id == PCI_DEVICE_ID_LSI_53C1010 ||
                 np->device_id == PCI_DEVICE_ID_LSI_53C1010_66 )
                np->rv_ccntl0 |= DPR;

        /*
        **      C1010_66MHz rev 0 part requies AIPCNTL1 bit 3 to be set.
        */
        if (np->device_id == PCI_DEVICE_ID_LSI_53C1010_66)
                OUTB(nc_aipcntl1, (1<<3));

        /*
        **  Write CCNTL0/CCNTL1 for chips capable of 64 bit addressing 
        **  and/or hardware phase mismatch, since only such chips 
        **  seem to support those IO registers.
        */
        if (np->features & (FE_DAC | FE_NOPM)) {
                OUTB (nc_ccntl0, np->rv_ccntl0);
                OUTB (nc_ccntl1, np->rv_ccntl1);
        }

        /*
        **      If phase mismatch handled by scripts (53C895A or 53C896 
        **      or 53C1010 or 53C1010_66), set PM jump addresses. 
        */

        if (np->features & FE_NOPM) {
                printk(KERN_INFO "%s: handling phase mismatch from SCRIPTS.\n", 
                       ncr_name(np));
                OUTL (nc_pmjad1, NCB_SCRIPTH_PHYS (np, pm_handle));
                OUTL (nc_pmjad2, NCB_SCRIPTH_PHYS (np, pm_handle));
        }

        /*
        **    Enable GPIO0 pin for writing if LED support from SCRIPTS.
        **    Also set GPIO5 and clear GPIO6 if hardware LED control.
        */

        if (np->features & FE_LED0)
                OUTB(nc_gpcntl, INB(nc_gpcntl) & ~0x01);
        else if (np->features & FE_LEDC)
                OUTB(nc_gpcntl, (INB(nc_gpcntl) & ~0x41) | 0x20);


        /*
        **      enable ints
        */

        OUTW (nc_sien , STO|HTH|MA|SGE|UDC|RST|PAR);
        OUTB (nc_dien , MDPE|BF|SSI|SIR|IID);

        /*
        **      For 895/895A/896/c1010
        **      Enable SBMC interrupt and save current SCSI bus mode.
        */
        if ( (np->features & FE_ULTRA2) || (np->features & FE_ULTRA3) ) {
                OUTONW (nc_sien, SBMC);
                np->scsi_mode = INB (nc_stest4) & SMODE;
        }

        /*
        **      Fill in target structure.
        **      Reinitialize usrsync.
        **      Reinitialize usrwide.
        **      Prepare sync negotiation according to actual SCSI bus mode.
        */

        for (i=0;i<MAX_TARGET;i++) {
                tcb_p tp = &np->target[i];

                tp->to_reset = 0;

                tp->sval    = 0;
                tp->wval    = np->rv_scntl3;
                tp->uval    = np->rv_scntl4;

                if (tp->usrsync != 255) {
                        if (tp->usrsync <= np->maxsync) {
                                if (tp->usrsync < np->minsync) {
                                        tp->usrsync = np->minsync;
                                }
                        }
                        else
                                tp->usrsync = 255;
                };

                if (tp->usrwide > np->maxwide)
                        tp->usrwide = np->maxwide;

                ncr_negotiate (np, tp);
        }

        /*
        **    Download SCSI SCRIPTS to on-chip RAM if present,
        **    and start script processor.
        **    We do the download preferently from the CPU.
        **    For platforms that may not support PCI memory mapping,
        **    we use a simple SCRIPTS that performs MEMORY MOVEs.
        */
        if (np->base2_ba) {
                if (bootverbose)
                        printk ("%s: Downloading SCSI SCRIPTS.\n",
                                ncr_name(np));
#ifdef SCSI_NCR_PCI_MEM_NOT_SUPPORTED
                if (np->base2_ws == 8192)
                        phys = NCB_SCRIPTH0_PHYS (np, start_ram64);
                else
                        phys = NCB_SCRIPTH_PHYS (np, start_ram);
#else
                if (np->base2_ws == 8192) {
                        memcpy_to_pci(np->base2_va + 4096,
                                        np->scripth0, sizeof(struct scripth));
                        OUTL (nc_mmws, np->scr_ram_seg);
                        OUTL (nc_mmrs, np->scr_ram_seg);
                        OUTL (nc_sfs,  np->scr_ram_seg);
                        phys = NCB_SCRIPTH_PHYS (np, start64);
                }
                else
                        phys = NCB_SCRIPT_PHYS (np, init);
                memcpy_to_pci(np->base2_va, np->script0, sizeof(struct script));
#endif /* SCSI_NCR_PCI_MEM_NOT_SUPPORTED */
        }
        else
                phys = NCB_SCRIPT_PHYS (np, init);

        np->istat_sem = 0;

        OUTL (nc_dsa, np->p_ncb);
        OUTL_DSP (phys);
}

/*==========================================================
**
**      Prepare the negotiation values for wide and
**      synchronous transfers.
**
**==========================================================
*/

static void ncr_negotiate (struct ncb* np, struct tcb* tp)
{
        /*
        **      minsync unit is 4ns !
        */

        u_long minsync = tp->usrsync;

        /*
        **      SCSI bus mode limit
        */

        if (np->scsi_mode && np->scsi_mode == SMODE_SE) {
                if (minsync < 12) minsync = 12;
        }

        /*
        **      our limit ..
        */

        if (minsync < np->minsync)
                minsync = np->minsync;

        /*
        **      divider limit
        */

        if (minsync > np->maxsync)
                minsync = 255;

        tp->minsync = minsync;
        tp->maxoffs = (minsync<255 ? np->maxoffs : 0);

        /*
        **      period=0: has to negotiate sync transfer
        */

        tp->period=0;

        /*
        **      widedone=0: has to negotiate wide transfer
        */
        tp->widedone=0;
}

/*==========================================================
**
**      Get clock factor and sync divisor for a given 
**      synchronous factor period.
**      Returns the clock factor (in sxfer) and scntl3 
**      synchronous divisor field.
**
**==========================================================
*/

static void ncr_getsync(ncb_p np, u_char sfac, u_char *fakp, u_char *scntl3p)
{
        u_long  clk = np->clock_khz;    /* SCSI clock frequency in kHz  */
        int     div = np->clock_divn;   /* Number of divisors supported */
        u_long  fak;                    /* Sync factor in sxfer         */
        u_long  per;                    /* Period in tenths of ns       */
        u_long  kpc;                    /* (per * clk)                  */

        /*
        **      Compute the synchronous period in tenths of nano-seconds
        **      from sfac.
        **
        **      Note, if sfac == 9, DT is being used. Double the period of 125
        **      to 250. 
        */
        if      (sfac <= 10)    per = 250;
        else if (sfac == 11)    per = 303;
        else if (sfac == 12)    per = 500;
        else                    per = 40 * sfac;

        /*
        **      Look for the greatest clock divisor that allows an 
        **      input speed faster than the period.
        */
        kpc = per * clk;
        while (--div >= 0)
                if (kpc >= (div_10M[div] << 2)) break;

        /*
        **      Calculate the lowest clock factor that allows an output 
        **      speed not faster than the period.
        */
        fak = (kpc - 1) / div_10M[div] + 1;

#if 0   /* This optimization does not seem very useful */

        per = (fak * div_10M[div]) / clk;

        /*
        **      Why not to try the immediate lower divisor and to choose 
        **      the one that allows the fastest output speed ?
        **      We don't want input speed too much greater than output speed.
        */
        if (div >= 1 && fak < 8) {
                u_long fak2, per2;
                fak2 = (kpc - 1) / div_10M[div-1] + 1;
                per2 = (fak2 * div_10M[div-1]) / clk;
                if (per2 < per && fak2 <= 8) {
                        fak = fak2;
                        per = per2;
                        --div;
                }
        }
#endif

        if (fak < 4) fak = 4;   /* Should never happen, too bad ... */

        /*
        **      Compute and return sync parameters for the ncr
        */
        *fakp           = fak - 4;

        /*
        ** If sfac < 25, and 8xx parts, desire that the chip operate at 
        ** least at Ultra speeds.  Must set bit 7 of scntl3.
        ** For C1010, do not set this bit. If operating at Ultra3 speeds,
        **      set the U3EN bit instead.
        */ 
        if ((np->device_id == PCI_DEVICE_ID_LSI_53C1010)  ||
                        (np->device_id == PCI_DEVICE_ID_LSI_53C1010_66)) {
                *scntl3p        = (div+1) << 4;
                *fakp           = 0;
        }
        else {
                *scntl3p        = ((div+1) << 4) + (sfac < 25 ? 0x80 : 0);
                *fakp           = fak - 4;
        }
}

/*==========================================================
**
**      Utility routine to return the current bus width 
**      synchronous period and offset.
**      Utilizes target sval, wval and uval  
**
**==========================================================
*/
static void ncr_get_xfer_info(ncb_p np, tcb_p tp, u_char *factor, 
                        u_char *offset, u_char *width)
{

        u_char idiv;
        u_long period;

        *width = (tp->wval & EWS) ? 1 : 0;

        if ((np->device_id == PCI_DEVICE_ID_LSI_53C1010) ||
                (np->device_id == PCI_DEVICE_ID_LSI_53C1010_66))
                *offset  = (tp->sval & 0x3f);
        else
                *offset  = (tp->sval & 0x1f);

        /*
         * Midlayer signal to the driver that all of the scsi commands
         * for the integrity check have completed. Save the negotiated
         * parameters (extracted from sval, wval and uval). 
         * See ncr_setsync for alg. details.
         */

        idiv = (tp->wval>>4) & 0x07;

        if ( *offset && idiv ) {
                if ((np->device_id == PCI_DEVICE_ID_LSI_53C1010) || 
                        (np->device_id == PCI_DEVICE_ID_LSI_53C1010_66)){
                    if (tp->uval & 0x80)
                        period = (2*div_10M[idiv-1])/np->clock_khz;
                    else 
                        period = (4*div_10M[idiv-1])/np->clock_khz;
                }
                else
                    period = (((tp->sval>>5)+4)*div_10M[idiv-1])/np->clock_khz;
        }
        else
                period = 0xffff;

        if      (period <= 125)         *factor =   9;
        else if (period <= 250)         *factor =  10;
        else if (period <= 303)         *factor  = 11;
        else if (period <= 500)         *factor  = 12;
        else                            *factor  = (period + 40 - 1) / 40;

}


/*==========================================================
**
**      Set actual values, sync status and patch all ccbs of 
**      a target according to new sync/wide agreement.
**
**==========================================================
*/

static void ncr_set_sync_wide_status (ncb_p np, u_char target)
{
        ccb_p cp = np->ccbc;
        tcb_p tp = &np->target[target];

        /*
        **      set actual value and sync_status
        **
        **      TEMP register contains current scripts address
        **      which is data type/direction/dependent.
        */
        OUTB (nc_sxfer, tp->sval);
        OUTB (nc_scntl3, tp->wval);
        if ((np->device_id == PCI_DEVICE_ID_LSI_53C1010)  ||
                        (np->device_id == PCI_DEVICE_ID_LSI_53C1010_66)) 
                OUTB (nc_scntl4, tp->uval); 

        /*
        **      patch ALL ccbs of this target.
        */
        for (cp = np->ccbc; cp; cp = cp->link_ccb) {
                if (cp->host_status == HS_IDLE)
                        continue;
                if (cp->target != target)
                        continue;
                cp->phys.select.sel_scntl3 = tp->wval;
                cp->phys.select.sel_sxfer  = tp->sval;
                if ((np->device_id == PCI_DEVICE_ID_LSI_53C1010) ||
                                (np->device_id == PCI_DEVICE_ID_LSI_53C1010_66))
                        cp->phys.select.sel_scntl4 = tp->uval;
        };
}

/*==========================================================
**
**      Switch sync mode for current job and it's target
**
**==========================================================
*/

static void ncr_setsync (ncb_p np, ccb_p cp, u_char scntl3, u_char sxfer, 
                                        u_char scntl4)
{
        tcb_p tp;
        u_char target = INB (nc_sdid) & 0x0f;
        u_char idiv;
        u_char offset;

        assert (cp);
        if (!cp) return;

        assert (target == (cp->target & 0xf));

        tp = &np->target[target];

        if ((np->device_id == PCI_DEVICE_ID_LSI_53C1010) ||
                        (np->device_id == PCI_DEVICE_ID_LSI_53C1010_66)) {
                offset = sxfer & 0x3f; /* bits 5-0 */
                scntl3 = (scntl3 & 0xf0) | (tp->wval & EWS);
                scntl4 = (scntl4 & 0x80);
        }
        else {
                offset = sxfer & 0x1f; /* bits 4-0 */
                if (!scntl3 || !offset)
                        scntl3 = np->rv_scntl3;

                scntl3 = (scntl3 & 0xf0) | (tp->wval & EWS) | 
                                (np->rv_scntl3 & 0x07);
        }
        

        /*
        **      Deduce the value of controller sync period from scntl3.
        **      period is in tenths of nano-seconds.
        */

        idiv = ((scntl3 >> 4) & 0x7);
        if ( offset && idiv) {
                if ((np->device_id == PCI_DEVICE_ID_LSI_53C1010) ||
                        (np->device_id == PCI_DEVICE_ID_LSI_53C1010_66)) {
                        /* Note: If extra data hold clocks are used,
                         * the formulas below must be modified.
                         * When scntl4 == 0, ST mode.
                         */
                        if (scntl4 & 0x80)
                                tp->period = (2*div_10M[idiv-1])/np->clock_khz;
                        else
                                tp->period = (4*div_10M[idiv-1])/np->clock_khz;
                }
                else 
                        tp->period = (((sxfer>>5)+4)*div_10M[idiv-1])/np->clock_khz;
        }
        else
                tp->period = 0xffff;


        /*
        **       Stop there if sync parameters are unchanged
        */
        if (tp->sval == sxfer && tp->wval == scntl3 && tp->uval == scntl4) return;
        tp->sval = sxfer;
        tp->wval = scntl3;
        tp->uval = scntl4;

        /*
        **      Bells and whistles   ;-)
        **      Donnot announce negotiations due to auto-sense, 
        **      unless user really want us to be verbose. :)
        */
        if ( bootverbose < 2 && (cp->host_flags & HF_AUTO_SENSE))
                goto next;
        PRINT_TARGET(np, target);
        if (offset) {
                unsigned f10 = 100000 << (tp->widedone ? tp->widedone -1 : 0);
                unsigned mb10 = (f10 + tp->period/2) / tp->period;
                char *scsi;

                /*
                **  Disable extended Sreq/Sack filtering
                */
                if ((tp->period <= 2000) && 
                        (np->device_id != PCI_DEVICE_ID_LSI_53C1010) &&
                        (np->device_id != PCI_DEVICE_ID_LSI_53C1010_66))
                                OUTOFFB (nc_stest2, EXT);

                /*
                **      Bells and whistles   ;-)
                */
                if      (tp->period < 250)      scsi = "FAST-80";
                else if (tp->period < 500)      scsi = "FAST-40";
                else if (tp->period < 1000)     scsi = "FAST-20";
                else if (tp->period < 2000)     scsi = "FAST-10";
                else                            scsi = "FAST-5";

                printk ("%s %sSCSI %d.%d MB/s (%d.%d ns, offset %d)\n", scsi,
                        tp->widedone > 1 ? "WIDE " : "",
                        mb10 / 10, mb10 % 10, tp->period / 10, tp->period % 10,
                        offset);
        } else
                printk ("%sasynchronous.\n", tp->widedone > 1 ? "wide " : "");
next:
        /*
        **      set actual value and sync_status
        **      patch ALL ccbs of this target.
        */
        ncr_set_sync_wide_status(np, target);
}


/*==========================================================
**
**      Switch wide mode for current job and it's target
**      SCSI specs say: a SCSI device that accepts a WDTR 
**      message shall reset the synchronous agreement to 
**      asynchronous mode.
**
**==========================================================
*/

static void ncr_setwide (ncb_p np, ccb_p cp, u_char wide, u_char ack)
{
        u_short target = INB (nc_sdid) & 0x0f;
        tcb_p tp;
        u_char  scntl3;
        u_char  sxfer;

        assert (cp);
        if (!cp) return;

        assert (target == (cp->target & 0xf));

        tp = &np->target[target];
        tp->widedone  =  wide+1;
        scntl3 = (tp->wval & (~EWS)) | (wide ? EWS : 0);

        sxfer = ack ? 0 : tp->sval;

        /*
        **       Stop there if sync/wide parameters are unchanged
        */
        if (tp->sval == sxfer && tp->wval == scntl3) return;
        tp->sval = sxfer;
        tp->wval = scntl3;

        /*
        **      Bells and whistles   ;-)
        */
        if (bootverbose >= 2) {
                PRINT_TARGET(np, target);
                if (scntl3 & EWS)
                        printk ("WIDE SCSI (16 bit) enabled.\n");
                else
                        printk ("WIDE SCSI disabled.\n");
        }

        /*
        **      set actual value and sync_status
        **      patch ALL ccbs of this target.
        */
        ncr_set_sync_wide_status(np, target);
}


/*==========================================================
**
**      Switch sync/wide mode for current job and it's target
**      PPR negotiations only
**
**==========================================================
*/

static void ncr_setsyncwide (ncb_p np, ccb_p cp, u_char scntl3, u_char sxfer, 
                                u_char scntl4, u_char wide)
{
        tcb_p tp;
        u_char target = INB (nc_sdid) & 0x0f;
        u_char idiv;
        u_char offset;

        assert (cp);
        if (!cp) return;

        assert (target == (cp->target & 0xf));

        tp = &np->target[target];
        tp->widedone  =  wide+1;

        if ((np->device_id == PCI_DEVICE_ID_LSI_53C1010) ||
                        (np->device_id == PCI_DEVICE_ID_LSI_53C1010_66)) {
                offset = sxfer & 0x3f; /* bits 5-0 */
                scntl3 = (scntl3 & 0xf0) | (wide ? EWS : 0);
                scntl4 = (scntl4 & 0x80);
        }
        else {
                offset = sxfer & 0x1f; /* bits 4-0 */
                if (!scntl3 || !offset)
                        scntl3 = np->rv_scntl3;

                scntl3 = (scntl3 & 0xf0) | (wide ? EWS : 0) | 
                                (np->rv_scntl3 & 0x07);
        }
        

        /*
        **      Deduce the value of controller sync period from scntl3.
        **      period is in tenths of nano-seconds.
        */

        idiv = ((scntl3 >> 4) & 0x7);
        if ( offset && idiv) {
                if ((np->device_id == PCI_DEVICE_ID_LSI_53C1010) ||
                        (np->device_id == PCI_DEVICE_ID_LSI_53C1010_66)) {
                        /* Note: If extra data hold clocks are used,
                         * the formulas below must be modified.
                         * When scntl4 == 0, ST mode.
                         */
                        if (scntl4 & 0x80)
                                tp->period = (2*div_10M[idiv-1])/np->clock_khz;
                        else
                                tp->period = (4*div_10M[idiv-1])/np->clock_khz;
                }
                else 
                        tp->period = (((sxfer>>5)+4)*div_10M[idiv-1])/np->clock_khz;
        }
        else
                tp->period = 0xffff;


        /*
        **       Stop there if sync parameters are unchanged
        */
        if (tp->sval == sxfer && tp->wval == scntl3 && tp->uval == scntl4) return;
        tp->sval = sxfer;
        tp->wval = scntl3;
        tp->uval = scntl4;

        /*
        **      Bells and whistles   ;-)
        **      Donnot announce negotiations due to auto-sense, 
        **      unless user really want us to be verbose. :)
        */
        if ( bootverbose < 2 && (cp->host_flags & HF_AUTO_SENSE))
                goto next;
        PRINT_TARGET(np, target);
        if (offset) {
                unsigned f10 = 100000 << (tp->widedone ? tp->widedone -1 : 0);
                unsigned mb10 = (f10 + tp->period/2) / tp->period;
                char *scsi;

                /*
                **  Disable extended Sreq/Sack filtering
                */
                if ((tp->period <= 2000) && 
                        (np->device_id != PCI_DEVICE_ID_LSI_53C1010) &&
                        (np->device_id != PCI_DEVICE_ID_LSI_53C1010_66))
                                OUTOFFB (nc_stest2, EXT);

                /*
                **      Bells and whistles   ;-)
                */
                if      (tp->period < 250)      scsi = "FAST-80";
                else if (tp->period < 500)      scsi = "FAST-40";
                else if (tp->period < 1000)     scsi = "FAST-20";
                else if (tp->period < 2000)     scsi = "FAST-10";
                else                            scsi = "FAST-5";

                printk ("%s %sSCSI %d.%d MB/s (%d.%d ns, offset %d)\n", scsi,
                        tp->widedone > 1 ? "WIDE " : "",
                        mb10 / 10, mb10 % 10, tp->period / 10, tp->period % 10,
                        offset);
        } else
                printk ("%sasynchronous.\n", tp->widedone > 1 ? "wide " : "");
next:
        /*
        **      set actual value and sync_status
        **      patch ALL ccbs of this target.
        */
        ncr_set_sync_wide_status(np, target);
}




/*==========================================================
**
**      Switch tagged mode for a target.
**
**==========================================================
*/

static void ncr_setup_tags (ncb_p np, u_char tn, u_char ln)
{
        tcb_p tp = &np->target[tn];
        lcb_p lp = ncr_lp(np, tp, ln);
        u_short reqtags, maxdepth;

        /*
        **      Just in case ...
        */
        if ((!tp) || (!lp))
                return;

        /*
        **      If SCSI device queue depth is not yet set, leave here.
        */
        if (!lp->scdev_depth)
                return;

        /*
        **      Donnot allow more tags than the SCSI driver can queue 
        **      for this device.
        **      Donnot allow more tags than we can handle.
        */
        maxdepth = lp->scdev_depth;
        if (maxdepth > lp->maxnxs)      maxdepth    = lp->maxnxs;
        if (lp->maxtags > maxdepth)     lp->maxtags = maxdepth;
        if (lp->numtags > maxdepth)     lp->numtags = maxdepth;

        /*
        **      only devices conformant to ANSI Version >= 2
        **      only devices capable of tagged commands
        **      only if enabled by user ..
        */
        if ((lp->inq_byte7 & INQ7_QUEUE) && lp->numtags > 1) {
                reqtags = lp->numtags;
        } else {
                reqtags = 1;
        };

        /*
        **      Update max number of tags
        */
        lp->numtags = reqtags;
        if (lp->numtags > lp->maxtags)
                lp->maxtags = lp->numtags;

        /*
        **      If we want to switch tag mode, we must wait 
        **      for no CCB to be active.
        */
        if      (reqtags > 1 && lp->usetags) {   /* Stay in tagged mode    */
                if (lp->queuedepth == reqtags)   /* Already announced      */
                        return;
                lp->queuedepth  = reqtags;
        }
        else if (reqtags <= 1 && !lp->usetags) { /* Stay in untagged mode  */
                lp->queuedepth  = reqtags;
                return;
        }
        else {                                   /* Want to switch tag mode */
                if (lp->busyccbs)                /* If not yet safe, return */
                        return;
                lp->queuedepth  = reqtags;
                lp->usetags     = reqtags > 1 ? 1 : 0;
        }

        /*
        **      Patch the lun mini-script, according to tag mode.
        */
        lp->resel_task = lp->usetags?
                        cpu_to_scr(NCB_SCRIPT_PHYS(np, resel_tag)) :
                        cpu_to_scr(NCB_SCRIPT_PHYS(np, resel_notag));

        /*
        **      Announce change to user.
        */
        if (bootverbose) {
                PRINT_LUN(np, tn, ln);
                if (lp->usetags)
                        printk("tagged command queue depth set to %d\n", reqtags);
                else
                        printk("tagged command queueing disabled\n");
        }
}

/*----------------------------------------------------
**
**      handle user commands
**
**----------------------------------------------------
*/

#ifdef SCSI_NCR_USER_COMMAND_SUPPORT

static void ncr_usercmd (ncb_p np)
{
        u_char t;
        tcb_p tp;
        int ln;
        u_long size;

        switch (np->user.cmd) {
        case 0: return;

        case UC_SETDEBUG:
#ifdef SCSI_NCR_DEBUG_INFO_SUPPORT
                ncr_debug = np->user.data;
#endif
                break;

        case UC_SETORDER:
                np->order = np->user.data;
                break;

        case UC_SETVERBOSE:
                np->verbose = np->user.data;
                break;

        default:
                /*
                **      We assume that other commands apply to targets.
                **      This should always be the case and avoid the below 
                **      4 lines to be repeated 5 times.
                */
                for (t = 0; t < MAX_TARGET; t++) {
                        if (!((np->user.target >> t) & 1))
                                continue;
                        tp = &np->target[t];

                        switch (np->user.cmd) {

                        case UC_SETSYNC:
                                tp->usrsync = np->user.data;
                                ncr_negotiate (np, tp);
                                break;

                        case UC_SETWIDE:
                                size = np->user.data;
                                if (size > np->maxwide)
                                        size=np->maxwide;
                                tp->usrwide = size;
                                ncr_negotiate (np, tp);
                                break;

                        case UC_SETTAGS:
                                tp->usrtags = np->user.data;
                                for (ln = 0; ln < MAX_LUN; ln++) {
                                        lcb_p lp;
                                        lp = ncr_lp(np, tp, ln);
                                        if (!lp)
                                                continue;
                                        lp->numtags = np->user.data;
                                        lp->maxtags = lp->numtags;
                                        ncr_setup_tags (np, t, ln);
                                }
                                break;

                        case UC_RESETDEV:
                                tp->to_reset = 1;
                                np->istat_sem = SEM;
                                OUTB (nc_istat, SIGP|SEM);
                                break;

                        case UC_CLEARDEV:
                                for (ln = 0; ln < MAX_LUN; ln++) {
                                        lcb_p lp;
                                        lp = ncr_lp(np, tp, ln);
                                        if (lp)
                                                lp->to_clear = 1;
                                }
                                np->istat_sem = SEM;
                                OUTB (nc_istat, SIGP|SEM);
                                break;

                        case UC_SETFLAG:
                                tp->usrflag = np->user.data;
                                break;
                        }
                }
                break;
        }
        np->user.cmd=0;
}
#endif

/*==========================================================
**
**
**      ncr timeout handler.
**
**
**==========================================================
**
**      Misused to keep the driver running when
**      interrupts are not configured correctly.
**
**----------------------------------------------------------
*/

static void ncr_timeout (ncb_p np)
{
        u_long  thistime = ktime_get(0);

        /*
        **      If release process in progress, let's go
        **      Set the release stage from 1 to 2 to synchronize
        **      with the release process.
        */

        if (np->release_stage) {
                if (np->release_stage == 1) np->release_stage = 2;
                return;
        }

#ifdef SCSI_NCR_PCIQ_BROKEN_INTR
        np->timer.expires = ktime_get((HZ+9)/10);
#else
        np->timer.expires = ktime_get(SCSI_NCR_TIMER_INTERVAL);
#endif
        add_timer(&np->timer);

        /*
        **      If we are resetting the ncr, wait for settle_time before 
        **      clearing it. Then command processing will be resumed.
        */
        if (np->settle_time) {
                if (np->settle_time <= thistime) {
                        if (bootverbose > 1)
                                printk("%s: command processing resumed\n", ncr_name(np));
                        np->settle_time = 0;
                        requeue_waiting_list(np);
                }
                return;
        }

        /*
        **      Nothing to do for now, but that may come.
        */
        if (np->lasttime + 4*HZ < thistime) {
                np->lasttime = thistime;
        }

#ifdef SCSI_NCR_PCIQ_MAY_MISS_COMPLETIONS
        /*
        **      Some way-broken PCI bridges may lead to 
        **      completions being lost when the clearing 
        **      of the INTFLY flag by the CPU occurs 
        **      concurrently with the chip raising this flag.
        **      If this ever happen, lost completions will 
        **      be reaped here.
        */
        ncr_wakeup_done(np);
#endif

#ifdef SCSI_NCR_PCIQ_BROKEN_INTR
        if (INB(nc_istat) & (INTF|SIP|DIP)) {

                /*
                **      Process pending interrupts.
                */
                if (DEBUG_FLAGS & DEBUG_TINY) printk ("{");
                ncr_exception (np);
                if (DEBUG_FLAGS & DEBUG_TINY) printk ("}");
        }
#endif /* SCSI_NCR_PCIQ_BROKEN_INTR */
}

/*==========================================================
**
**      log message for real hard errors
**
**      "ncr0 targ 0?: ERROR (ds:si) (so-si-sd) (sxfer/scntl3) @ name (dsp:dbc)."
**      "             reg: r0 r1 r2 r3 r4 r5 r6 ..... rf."
**
**      exception register:
**              ds:     dstat
**              si:     sist
**
**      SCSI bus lines:
**              so:     control lines as driver by NCR.
**              si:     control lines as seen by NCR.
**              sd:     scsi data lines as seen by NCR.
**
**      wide/fastmode:
**              sxfer:  (see the manual)
**              scntl3: (see the manual)
**
**      current script command:
**              dsp:    script address (relative to start of script).
**              dbc:    first word of script command.
**
**      First 24 register of the chip:
**              r0..rf
**
**==========================================================
*/

static void ncr_log_hard_error(ncb_p np, u_short sist, u_char dstat)
{
        u_int32 dsp;
        int     script_ofs;
        int     script_size;
        char    *script_name;
        u_char  *script_base;
        int     i;

        dsp     = INL (nc_dsp);

        if (dsp > np->p_script && dsp <= np->p_script + sizeof(struct script)) {
                script_ofs      = dsp - np->p_script;
                script_size     = sizeof(struct script);
                script_base     = (u_char *) np->script0;
                script_name     = "script";
        }
        else if (np->p_scripth < dsp && 
                 dsp <= np->p_scripth + sizeof(struct scripth)) {
                script_ofs      = dsp - np->p_scripth;
                script_size     = sizeof(struct scripth);
                script_base     = (u_char *) np->scripth0;
                script_name     = "scripth";
        } else {
                script_ofs      = dsp;
                script_size     = 0;
                script_base     = 0;
                script_name     = "mem";
        }

        printk ("%s:%d: ERROR (%x:%x) (%x-%x-%x) (%x/%x) @ (%s %x:%08x).\n",
                ncr_name (np), (unsigned)INB (nc_sdid)&0x0f, dstat, sist,
                (unsigned)INB (nc_socl), (unsigned)INB (nc_sbcl), (unsigned)INB (nc_sbdl),
                (unsigned)INB (nc_sxfer),(unsigned)INB (nc_scntl3), script_name, script_ofs,
                (unsigned)INL (nc_dbc));

        if (((script_ofs & 3) == 0) &&
            (unsigned)script_ofs < script_size) {
                printk ("%s: script cmd = %08x\n", ncr_name(np),
                        scr_to_cpu((int) *(ncrcmd *)(script_base + script_ofs)));
        }

        printk ("%s: regdump:", ncr_name(np));
        for (i=0; i<24;i++)
            printk (" %02x", (unsigned)INB_OFF(i));
        printk (".\n");
}

/*============================================================
**
**      ncr chip exception handler.
**
**============================================================
**
**      In normal situations, interrupt conditions occur one at 
**      a time. But when something bad happens on the SCSI BUS, 
**      the chip may raise several interrupt flags before 
**      stopping and interrupting the CPU. The additionnal 
**      interrupt flags are stacked in some extra registers 
**      after the SIP and/or DIP flag has been raised in the 
**      ISTAT. After the CPU has read the interrupt condition 
**      flag from SIST or DSTAT, the chip unstacks the other 
**      interrupt flags and sets the corresponding bits in 
**      SIST or DSTAT. Since the chip starts stacking once the 
**      SIP or DIP flag is set, there is a small window of time 
**      where the stacking does not occur.
**
**      Typically, multiple interrupt conditions may happen in 
**      the following situations:
**
**      - SCSI parity error + Phase mismatch  (PAR|MA)
**        When an parity error is detected in input phase 
**        and the device switches to msg-in phase inside a 
**        block MOV.
**      - SCSI parity error + Unexpected disconnect (PAR|UDC)
**        When a stupid device does not want to handle the 
**        recovery of an SCSI parity error.
**      - Some combinations of STO, PAR, UDC, ...
**        When using non compliant SCSI stuff, when user is 
**        doing non compliant hot tampering on the BUS, when 
**        something really bad happens to a device, etc ...
**
**      The heuristic suggested by SYMBIOS to handle 
**      multiple interrupts is to try unstacking all 
**      interrupts conditions and to handle them on some 
**      priority based on error severity.
**      This will work when the unstacking has been 
**      successful, but we cannot be 100 % sure of that, 
**      since the CPU may have been faster to unstack than 
**      the chip is able to stack. Hmmm ... But it seems that 
**      such a situation is very unlikely to happen.
**
**      If this happen, for example STO catched by the CPU 
**      then UDC happenning before the CPU have restarted 
**      the SCRIPTS, the driver may wrongly complete the 
**      same command on UDC, since the SCRIPTS didn't restart 
**      and the DSA still points to the same command.
**      We avoid this situation by setting the DSA to an 
**      invalid value when the CCB is completed and before 
**      restarting the SCRIPTS.
**
**      Another issue is that we need some section of our 
**      recovery procedures to be somehow uninterruptible and 
**      that the SCRIPTS processor does not provides such a 
**      feature. For this reason, we handle recovery preferently 
**      from the C code and check against some SCRIPTS 
**      critical sections from the C code.
**
**      Hopefully, the interrupt handling of the driver is now 
**      able to resist to weird BUS error conditions, but donnot 
**      ask me for any guarantee that it will never fail. :-)
**      Use at your own decision and risk.
**
**============================================================
*/

void ncr_exception (ncb_p np)
{
        u_char  istat, istatc;
        u_char  dstat;
        u_short sist;
        int     i;

        /*
        **      interrupt on the fly ?
        **
        **      A `dummy read' is needed to ensure that the 
        **      clear of the INTF flag reaches the device 
        **      before the scanning of the DONE queue.
        */
        istat = INB (nc_istat);
        if (istat & INTF) {
                OUTB (nc_istat, (istat & SIGP) | INTF | np->istat_sem);
                istat = INB (nc_istat);         /* DUMMY READ */
                if (DEBUG_FLAGS & DEBUG_TINY) printk ("F ");
                (void)ncr_wakeup_done (np);
        };

        if (!(istat & (SIP|DIP)))
                return;

#if 0   /* We should never get this one */
        if (istat & CABRT)
                OUTB (nc_istat, CABRT);
#endif

        /*
        **      Steinbach's Guideline for Systems Programming:
        **      Never test for an error condition you don't know how to handle.
        */

        /*========================================================
        **      PAR and MA interrupts may occur at the same time,
        **      and we need to know of both in order to handle 
        **      this situation properly. We try to unstack SCSI 
        **      interrupts for that reason. BTW, I dislike a LOT 
        **      such a loop inside the interrupt routine.
        **      Even if DMA interrupt stacking is very unlikely to 
        **      happen, we also try unstacking these ones, since 
        **      this has no performance impact.
        **=========================================================
        */
        sist    = 0;
        dstat   = 0;
        istatc  = istat;
        do {
                if (istatc & SIP)
                        sist  |= INW (nc_sist);
                if (istatc & DIP)
                        dstat |= INB (nc_dstat);
                istatc = INB (nc_istat);
                istat |= istatc;
        } while (istatc & (SIP|DIP));

        if (DEBUG_FLAGS & DEBUG_TINY)
                printk ("<%d|%x:%x|%x:%x>",
                        (int)INB(nc_scr0),
                        dstat,sist,
                        (unsigned)INL(nc_dsp),
                        (unsigned)INL(nc_dbc));

        /*
        **      On paper, a memory barrier may be needed here.
        **      And since we are paranoid ... :)
        */
        MEMORY_BARRIER();

        /*========================================================
        **      First, interrupts we want to service cleanly.
        **
        **      Phase mismatch (MA) is the most frequent interrupt 
        **      for chip earlier than the 896 and so we have to service 
        **      it as quickly as possible.
        **      A SCSI parity error (PAR) may be combined with a phase 
        **      mismatch condition (MA).
        **      Programmed interrupts (SIR) are used to call the C code 
        **      from SCRIPTS.
        **      The single step interrupt (SSI) is not used in this 
        **      driver.
        **=========================================================
        */

        if (!(sist  & (STO|GEN|HTH|SGE|UDC|SBMC|RST)) &&
            !(dstat & (MDPE|BF|ABRT|IID))) {
                if      (sist & PAR)    ncr_int_par (np, sist);
                else if (sist & MA)     ncr_int_ma (np);
                else if (dstat & SIR)   ncr_int_sir (np);
                else if (dstat & SSI)   OUTONB_STD ();
                else                    goto unknown_int;
                return;
        };

        /*========================================================
        **      Now, interrupts that donnot happen in normal 
        **      situations and that we may need to recover from.
        **
        **      On SCSI RESET (RST), we reset everything.
        **      On SCSI BUS MODE CHANGE (SBMC), we complete all 
        **      active CCBs with RESET status, prepare all devices 
        **      for negotiating again and restart the SCRIPTS.
        **      On STO and UDC, we complete the CCB with the corres- 
        **      ponding status and restart the SCRIPTS.
        **=========================================================
        */

        if (sist & RST) {
                ncr_init (np, 1, bootverbose ? "scsi reset" : NULL, HS_RESET);
                return;
        };

        OUTB (nc_ctest3, np->rv_ctest3 | CLF);  /* clear dma fifo  */
        OUTB (nc_stest3, TE|CSF);               /* clear scsi fifo */

        if (!(sist  & (GEN|HTH|SGE)) &&
            !(dstat & (MDPE|BF|ABRT|IID))) {
                if      (sist & SBMC)   ncr_int_sbmc (np);
                else if (sist & STO)    ncr_int_sto (np);
                else if (sist & UDC)    ncr_int_udc (np);
                else                    goto unknown_int;
                return;
        };

        /*=========================================================
        **      Now, interrupts we are not able to recover cleanly.
        **
        **      Do the register dump.
        **      Log message for hard errors.
        **      Reset everything.
        **=========================================================
        */
        if (ktime_exp(np->regtime)) {
                np->regtime = ktime_get(10*HZ);
                for (i = 0; i<sizeof(np->regdump); i++)
                        ((char*)&np->regdump)[i] = INB_OFF(i);
                np->regdump.nc_dstat = dstat;
                np->regdump.nc_sist  = sist;
        };

        ncr_log_hard_error(np, sist, dstat);

        if ((np->device_id == PCI_DEVICE_ID_LSI_53C1010) ||
                (np->device_id == PCI_DEVICE_ID_LSI_53C1010_66)) {
                u_char ctest4_o, ctest4_m;
                u_char shadow;

                /* 
                 * Get shadow register data 
                 * Write 1 to ctest4
                 */
                ctest4_o = INB(nc_ctest4);

                OUTB(nc_ctest4, ctest4_o | 0x10);
                
                ctest4_m = INB(nc_ctest4);
                shadow = INW_OFF(0x42);

                OUTB(nc_ctest4, ctest4_o);

                printk("%s: ctest4/sist original 0x%x/0x%X  mod: 0x%X/0x%x\n", 
                        ncr_name(np), ctest4_o, sist, ctest4_m, shadow);
        }

        if ((sist & (GEN|HTH|SGE)) ||
                (dstat & (MDPE|BF|ABRT|IID))) {
                ncr_start_reset(np);
                return;
        };

unknown_int:
        /*=========================================================
        **      We just miss the cause of the interrupt. :(
        **      Print a message. The timeout will do the real work.
        **=========================================================
        */
        printk( "%s: unknown interrupt(s) ignored, "
                "ISTAT=0x%x DSTAT=0x%x SIST=0x%x\n",
                ncr_name(np), istat, dstat, sist);
}


/*==========================================================
**
**      generic recovery from scsi interrupt
**
**==========================================================
**
**      The doc says that when the chip gets an SCSI interrupt,
**      it tries to stop in an orderly fashion, by completing 
**      an instruction fetch that had started or by flushing 
**      the DMA fifo for a write to memory that was executing.
**      Such a fashion is not enough to know if the instruction 
**      that was just before the current DSP value has been 
**      executed or not.
**
**      There are 3 small SCRIPTS sections that deal with the 
**      start queue and the done queue that may break any 
**      assomption from the C code if we are interrupted 
**      inside, so we reset if it happens. Btw, since these 
**      SCRIPTS sections are executed while the SCRIPTS hasn't 
**      started SCSI operations, it is very unlikely to happen.
**
**      All the driver data structures are supposed to be 
**      allocated from the same 4 GB memory window, so there 
**      is a 1 to 1 relationship between DSA and driver data 
**      structures. Since we are careful :) to invalidate the 
**      DSA when we complete a command or when the SCRIPTS 
**      pushes a DSA into a queue, we can trust it when it 
**      points to a CCB.
**
**----------------------------------------------------------
*/
static void ncr_recover_scsi_int (ncb_p np, u_char hsts)
{
        u_int32 dsp     = INL (nc_dsp);
        u_int32 dsa     = INL (nc_dsa);
        ccb_p cp        = ncr_ccb_from_dsa(np, dsa);

        /*
        **      If we haven't been interrupted inside the SCRIPTS 
        **      critical pathes, we can safely restart the SCRIPTS 
        **      and trust the DSA value if it matches a CCB.
        */
        if ((!(dsp > NCB_SCRIPT_PHYS (np, getjob_begin) &&
               dsp < NCB_SCRIPT_PHYS (np, getjob_end) + 1)) &&
            (!(dsp > NCB_SCRIPT_PHYS (np, ungetjob) &&
               dsp < NCB_SCRIPT_PHYS (np, reselect) + 1)) &&
            (!(dsp > NCB_SCRIPTH_PHYS (np, sel_for_abort) &&
               dsp < NCB_SCRIPTH_PHYS (np, sel_for_abort_1) + 1)) &&
            (!(dsp > NCB_SCRIPT_PHYS (np, done) &&
               dsp < NCB_SCRIPT_PHYS (np, done_end) + 1))) {
                if (cp) {
                        cp->host_status = hsts;
                        ncr_complete (np, cp);
                }
                OUTL (nc_dsa, DSA_INVALID);
                OUTB (nc_ctest3, np->rv_ctest3 | CLF);  /* clear dma fifo  */
                OUTB (nc_stest3, TE|CSF);               /* clear scsi fifo */
                OUTL_DSP (NCB_SCRIPT_PHYS (np, start));
        }
        else
                goto reset_all;

        return;

reset_all:
        ncr_start_reset(np);
}

/*==========================================================
**
**      ncr chip exception handler for selection timeout
**
**==========================================================
**
**      There seems to be a bug in the 53c810.
**      Although a STO-Interrupt is pending,
**      it continues executing script commands.
**      But it will fail and interrupt (IID) on
**      the next instruction where it's looking
**      for a valid phase.
**
**----------------------------------------------------------
*/

void ncr_int_sto (ncb_p np)
{
        u_int32 dsp     = INL (nc_dsp);

        if (DEBUG_FLAGS & DEBUG_TINY) printk ("T");

        if (dsp == NCB_SCRIPT_PHYS (np, wf_sel_done) + 8 ||
            !(driver_setup.recovery & 1))
                ncr_recover_scsi_int(np, HS_SEL_TIMEOUT);
        else
                ncr_start_reset(np);
}

/*==========================================================
**
**      ncr chip exception handler for unexpected disconnect
**
**==========================================================
**
**----------------------------------------------------------
*/
void ncr_int_udc (ncb_p np)
{
        u_int32 dsa = INL (nc_dsa);
        ccb_p   cp  = ncr_ccb_from_dsa(np, dsa);

        /*
         * Fix Up. Some disks respond to a PPR negotiation with
         * a bus free instead of a message reject. 
         * Disable ppr negotiation if this is first time
         * tried ppr negotiation.
         */
        if (cp) {
                tcb_p tp = &np->target[cp->target];
                if (tp->ppr_negotiation == 1)
                        tp->ppr_negotiation = 0;
        }
        
        printk ("%s: unexpected disconnect\n", ncr_name(np));
        ncr_recover_scsi_int(np, HS_UNEXPECTED);
}

/*==========================================================
**
**      ncr chip exception handler for SCSI bus mode change
**
**==========================================================
**
**      spi2-r12 11.2.3 says a transceiver mode change must 
**      generate a reset event and a device that detects a reset 
**      event shall initiate a hard reset. It says also that a
**      device that detects a mode change shall set data transfer 
**      mode to eight bit asynchronous, etc...
**      So, just resetting should be enough.
**       
**
**----------------------------------------------------------
*/

static void ncr_int_sbmc (ncb_p np)
{
        u_char scsi_mode = INB (nc_stest4) & SMODE;

        printk("%s: SCSI bus mode change from %x to %x.\n",
                ncr_name(np), np->scsi_mode, scsi_mode);

        np->scsi_mode = scsi_mode;


        /*
        **      Suspend command processing for 1 second and 
        **      reinitialize all except the chip.
        */
        np->settle_time = ktime_get(1*HZ);
        ncr_init (np, 0, bootverbose ? "scsi mode change" : NULL, HS_RESET);
}

/*==========================================================
**
**      ncr chip exception handler for SCSI parity error.
**
**==========================================================
**
**      When the chip detects a SCSI parity error and is 
**      currently executing a (CH)MOV instruction, it does 
**      not interrupt immediately, but tries to finish the 
**      transfer of the current scatter entry before 
**      interrupting. The following situations may occur:
**
**      - The complete scatter entry has been transferred 
**        without the device having changed phase.
**        The chip will then interrupt with the DSP pointing 
**        to the instruction that follows the MOV.
**
**      - A phase mismatch occurs before the MOV finished 
**        and phase errors are to be handled by the C code.
**        The chip will then interrupt with both PAR and MA 
**        conditions set.
**
**      - A phase mismatch occurs before the MOV finished and 
**        phase errors are to be handled by SCRIPTS (895A or 896).
**        The chip will load the DSP with the phase mismatch 
**        JUMP address and interrupt the host processor.
**
**----------------------------------------------------------
*/

static void ncr_int_par (ncb_p np, u_short sist)
{
        u_char  hsts    = INB (HS_PRT);
        u_int32 dsp     = INL (nc_dsp);
        u_int32 dbc     = INL (nc_dbc);
        u_int32 dsa     = INL (nc_dsa);
        u_char  sbcl    = INB (nc_sbcl);
        u_char  cmd     = dbc >> 24;
        int phase       = cmd & 7;
        ccb_p   cp      = ncr_ccb_from_dsa(np, dsa);

        printk("%s: SCSI parity error detected: SCR1=%d DBC=%x SBCL=%x\n",
                ncr_name(np), hsts, dbc, sbcl);

        /*
        **      Check that the chip is connected to the SCSI BUS.
        */
        if (!(INB (nc_scntl1) & ISCON)) {
                if (!(driver_setup.recovery & 1)) {
                        ncr_recover_scsi_int(np, HS_FAIL);
                        return;
                }
                goto reset_all;
        }

        /*
        **      If the nexus is not clearly identified, reset the bus.
        **      We will try to do better later.
        */
        if (!cp)
                goto reset_all;

        /*
        **      Check instruction was a MOV, direction was INPUT and 
        **      ATN is asserted.
        */
        if ((cmd & 0xc0) || !(phase & 1) || !(sbcl & 0x8))
                goto reset_all;

        /*
        **      Keep track of the parity error.
        */
        OUTONB (HF_PRT, HF_EXT_ERR);
        cp->xerr_status |= XE_PARITY_ERR;

        /*
        **      Prepare the message to send to the device.
        */
        np->msgout[0] = (phase == 7) ? M_PARITY : M_ID_ERROR;

#ifdef  SCSI_NCR_INTEGRITY_CHECKING
        /*
        **      Save error message. For integrity check use only.
        */
        if (np->check_integrity) 
                np->check_integ_par = np->msgout[0];
#endif

        /*
        **      If the old phase was DATA IN or DT DATA IN phase, 
        **      we have to deal with the 3 situations described above.
        **      For other input phases (MSG IN and STATUS), the device 
        **      must resend the whole thing that failed parity checking 
        **      or signal error. So, jumping to dispatcher should be OK.
        */
        if ((phase == 1) || (phase == 5)) {
                /* Phase mismatch handled by SCRIPTS */
                if (dsp == NCB_SCRIPTH_PHYS (np, pm_handle))
                        OUTL_DSP (dsp);
                /* Phase mismatch handled by the C code */
                else if (sist & MA)
                        ncr_int_ma (np);
                /* No phase mismatch occurred */
                else {
                        OUTL (nc_temp, dsp);
                        OUTL_DSP (NCB_SCRIPT_PHYS (np, dispatch));
                }
        }
        else 
                OUTL_DSP (NCB_SCRIPT_PHYS (np, clrack));
        return;

reset_all:
        ncr_start_reset(np);
        return;
}

/*==========================================================
**
**
**      ncr chip exception handler for phase errors.
**
**
**==========================================================
**
**      We have to construct a new transfer descriptor,
**      to transfer the rest of the current block.
**
**----------------------------------------------------------
*/

static void ncr_int_ma (ncb_p np)
{
        u_int32 dbc;
        u_int32 rest;
        u_int32 dsp;
        u_int32 dsa;
        u_int32 nxtdsp;
        u_int32 *vdsp;
        u_int32 oadr, olen;
        u_int32 *tblp;
        u_int32 newcmd;
        u_int   delta;
        u_char  cmd;
        u_char  hflags, hflags0;
        struct pm_ctx *pm;
        ccb_p   cp;

        dsp     = INL (nc_dsp);
        dbc     = INL (nc_dbc);
        dsa     = INL (nc_dsa);

        cmd     = dbc >> 24;
        rest    = dbc & 0xffffff;
        delta   = 0;

        /*
        **      locate matching cp.
        */
        cp = ncr_ccb_from_dsa(np, dsa);

        if (DEBUG_FLAGS & DEBUG_PHASE)
                printk("CCB = %2x %2x %2x %2x %2x %2x\n", 
                        cp->cmd->cmnd[0], cp->cmd->cmnd[1], cp->cmd->cmnd[2],
                        cp->cmd->cmnd[3], cp->cmd->cmnd[4], cp->cmd->cmnd[5]);

        /*
        **      Donnot take into account dma fifo and various buffers in 
        **      INPUT phase since the chip flushes everything before 
        **      raising the MA interrupt for interrupted INPUT phases.
        **      For DATA IN phase, we will check for the SWIDE later.
        */
        if ((cmd & 7) != 1 && (cmd & 7) != 5) {
                u_int32 dfifo;
                u_char ss0, ss2;

                /*
                **  If C1010, DFBC contains number of bytes in DMA fifo.
                **  else read DFIFO, CTEST[4-6] using 1 PCI bus ownership.
                */
                if ((np->device_id == PCI_DEVICE_ID_LSI_53C1010) ||
                                (np->device_id == PCI_DEVICE_ID_LSI_53C1010_66)) 
                        delta = INL(nc_dfbc) & 0xffff;
                else {
                        dfifo = INL(nc_dfifo);

                        /*
                        **      Calculate remaining bytes in DMA fifo.
                        **      C1010 - always large fifo, value in dfbc
                        **      Otherwise, (CTEST5 = dfifo >> 16)
                        */
                        if (dfifo & (DFS << 16))
                                delta = ((((dfifo >> 8) & 0x300) |
                                          (dfifo & 0xff)) - rest) & 0x3ff;
                        else
                                delta = ((dfifo & 0xff) - rest) & 0x7f;

                        /*
                        **      The data in the dma fifo has not been 
                        **      transferred to the target -> add the amount 
                        **      to the rest and clear the data.
                        **      Check the sstat2 register in case of wide
                        **      transfer.
                        */

                }
                
                rest += delta;
                ss0  = INB (nc_sstat0);
                if (ss0 & OLF) rest++;
                if ((np->device_id != PCI_DEVICE_ID_LSI_53C1010) && 
                                (np->device_id != PCI_DEVICE_ID_LSI_53C1010_66) && (ss0 & ORF)) 
                        rest++;
                if (cp && (cp->phys.select.sel_scntl3 & EWS)) {
                        ss2 = INB (nc_sstat2);
                        if (ss2 & OLF1) rest++;
                        if ((np->device_id != PCI_DEVICE_ID_LSI_53C1010) &&
                                        (np->device_id != PCI_DEVICE_ID_LSI_53C1010_66) && (ss2 & ORF)) 
                                rest++;
                };

                /*
                **      Clear fifos.
                */
                OUTB (nc_ctest3, np->rv_ctest3 | CLF);  /* dma fifo  */
                OUTB (nc_stest3, TE|CSF);               /* scsi fifo */
        }

        /*
        **      log the information
        */

        if (DEBUG_FLAGS & (DEBUG_TINY|DEBUG_PHASE))
                printk ("P%x%x RL=%d D=%d ", cmd&7, INB(nc_sbcl)&7,
                        (unsigned) rest, (unsigned) delta);

        /*
        **      try to find the interrupted script command,
        **      and the address at which to continue.
        */
        vdsp    = 0;
        nxtdsp  = 0;
        if      (dsp >  np->p_script &&
                 dsp <= np->p_script + sizeof(struct script)) {
                vdsp = (u_int32 *)((char*)np->script0 + (dsp-np->p_script-8));
                nxtdsp = dsp;
        }
        else if (dsp >  np->p_scripth &&
                 dsp <= np->p_scripth + sizeof(struct scripth)) {
                vdsp = (u_int32 *)((char*)np->scripth0 + (dsp-np->p_scripth-8));
                nxtdsp = dsp;
        }

        /*
        **      log the information
        */
        if (DEBUG_FLAGS & DEBUG_PHASE) {
                printk ("\nCP=%p DSP=%x NXT=%x VDSP=%p CMD=%x ",
                        cp, (unsigned)dsp, (unsigned)nxtdsp, vdsp, cmd);
        };

        if (!vdsp) {
                printk ("%s: interrupted SCRIPT address not found.\n", 
                        ncr_name (np));
                goto reset_all;
        }

        if (!cp) {
                printk ("%s: SCSI phase error fixup: CCB already dequeued.\n", 
                        ncr_name (np));
                goto reset_all;
        }

        /*
        **      get old startaddress and old length.
        */

        oadr = scr_to_cpu(vdsp[1]);

        if (cmd & 0x10) {       /* Table indirect */
                tblp = (u_int32 *) ((char*) &cp->phys + oadr);
                olen = scr_to_cpu(tblp[0]);
                oadr = scr_to_cpu(tblp[1]);
        } else {
                tblp = (u_int32 *) 0;
                olen = scr_to_cpu(vdsp[0]) & 0xffffff;
        };

        if (DEBUG_FLAGS & DEBUG_PHASE) {
                printk ("OCMD=%x\nTBLP=%p OLEN=%x OADR=%x\n",
                        (unsigned) (scr_to_cpu(vdsp[0]) >> 24),
                        tblp,
                        (unsigned) olen,
                        (unsigned) oadr);
        };

        /*
        **      check cmd against assumed interrupted script command.
        **      If dt data phase, the MOVE instruction hasn't bit 4 of 
        **      the phase.
        */

        if (((cmd & 2) ? cmd : (cmd & ~4)) != (scr_to_cpu(vdsp[0]) >> 24)) {
                PRINT_ADDR(cp->cmd);
                printk ("internal error: cmd=%02x != %02x=(vdsp[0] >> 24)\n",
                        (unsigned)cmd, (unsigned)scr_to_cpu(vdsp[0]) >> 24);

                goto reset_all;
        };

        /*
        **      if old phase not dataphase, leave here.
        **      C/D line is low if data.
        */

        if (cmd & 0x02) {
                PRINT_ADDR(cp->cmd);
                printk ("phase change %x-%x %d@%08x resid=%d.\n",
                        cmd&7, INB(nc_sbcl)&7, (unsigned)olen,
                        (unsigned)oadr, (unsigned)rest);
                goto unexpected_phase;
        };

        /*
        **      Choose the correct PM save area.
        **
        **      Look at the PM_SAVE SCRIPT if you want to understand 
        **      this stuff. The equivalent code is implemented in 
        **      SCRIPTS for the 895A and 896 that are able to handle 
        **      PM from the SCRIPTS processor.
        */

        hflags0 = INB (HF_PRT);
        hflags = hflags0;

        if (hflags & (HF_IN_PM0 | HF_IN_PM1 | HF_DP_SAVED)) {
                if (hflags & HF_IN_PM0)
                        nxtdsp = scr_to_cpu(cp->phys.pm0.ret);
                else if (hflags & HF_IN_PM1)
                        nxtdsp = scr_to_cpu(cp->phys.pm1.ret);

                if (hflags & HF_DP_SAVED)
                        hflags ^= HF_ACT_PM;
        }

        if (!(hflags & HF_ACT_PM)) {
                pm = &cp->phys.pm0;
                newcmd = NCB_SCRIPT_PHYS(np, pm0_data);
        }
        else {
                pm = &cp->phys.pm1;
                newcmd = NCB_SCRIPT_PHYS(np, pm1_data);
        }

        hflags &= ~(HF_IN_PM0 | HF_IN_PM1 | HF_DP_SAVED);
        if (hflags != hflags0)
                OUTB (HF_PRT, hflags);

        /*
        **      fillin the phase mismatch context
        */

        pm->sg.addr = cpu_to_scr(oadr + olen - rest);
        pm->sg.size = cpu_to_scr(rest);
        pm->ret     = cpu_to_scr(nxtdsp);

        /*
        **      If we have a SWIDE,
        **      - prepare the address to write the SWIDE from SCRIPTS,
        **      - compute the SCRIPTS address to restart from,
        **      - move current data pointer context by one byte.
        */
        nxtdsp = NCB_SCRIPT_PHYS (np, dispatch);
        if ( ((cmd & 7) == 1  || (cmd & 7) == 5)  
                && cp && (cp->phys.select.sel_scntl3 & EWS) &&
            (INB (nc_scntl2) & WSR)) {
                u32 tmp;

#ifdef  SYM_DEBUG_PM_WITH_WSR
                PRINT_ADDR(cp);
                printk ("MA interrupt with WSR set - "
                        "pm->sg.addr=%x - pm->sg.size=%d\n",
                        pm->sg.addr, pm->sg.size);
#endif
                /*
                 *  Set up the table indirect for the MOVE
                 *  of the residual byte and adjust the data
                 *  pointer context.
                 */
                tmp = scr_to_cpu(pm->sg.addr);
                cp->phys.wresid.addr = cpu_to_scr(tmp);
                pm->sg.addr = cpu_to_scr(tmp + 1);
                tmp = scr_to_cpu(pm->sg.size);
                cp->phys.wresid.size = cpu_to_scr((tmp&0xff000000) | 1);
                pm->sg.size = cpu_to_scr(tmp - 1);

                /*
                 *  If only the residual byte is to be moved,
                 *  no PM context is needed.
                 */
                if ((tmp&0xffffff) == 1)
                        newcmd = pm->ret;

                /*
                 *  Prepare the address of SCRIPTS that will
                 *  move the residual byte to memory.
                 */
                nxtdsp = NCB_SCRIPTH_PHYS (np, wsr_ma_helper);
        }

        if (DEBUG_FLAGS & DEBUG_PHASE) {
                PRINT_ADDR(cp->cmd);
                printk ("PM %x %x %x / %x %x %x.\n",
                        hflags0, hflags, newcmd,
                        (unsigned)scr_to_cpu(pm->sg.addr),
                        (unsigned)scr_to_cpu(pm->sg.size),
                        (unsigned)scr_to_cpu(pm->ret));
        }

        /*
        **      Restart the SCRIPTS processor.
        */

        OUTL (nc_temp, newcmd);
        OUTL_DSP (nxtdsp);
        return;

        /*
        **      Unexpected phase changes that occurs when the current phase 
        **      is not a DATA IN or DATA OUT phase are due to error conditions.
        **      Such event may only happen when the SCRIPTS is using a 
        **      multibyte SCSI MOVE.
        **
        **      Phase change            Some possible cause
        **
        **      COMMAND  --> MSG IN     SCSI parity error detected by target.
        **      COMMAND  --> STATUS     Bad command or refused by target.
        **      MSG OUT  --> MSG IN     Message rejected by target.
        **      MSG OUT  --> COMMAND    Bogus target that discards extended
        **                              negotiation messages.
        **
        **      The code below does not care of the new phase and so 
        **      trusts the target. Why to annoy it ?
        **      If the interrupted phase is COMMAND phase, we restart at
        **      dispatcher.
        **      If a target does not get all the messages after selection, 
        **      the code assumes blindly that the target discards extended 
        **      messages and clears the negotiation status.
        **      If the target does not want all our response to negotiation,
        **      we force a SIR_NEGO_PROTO interrupt (it is a hack that avoids 
        **      bloat for such a should_not_happen situation).
        **      In all other situation, we reset the BUS.
        **      Are these assumptions reasonnable ? (Wait and see ...)
        */
unexpected_phase:
        dsp -= 8;
        nxtdsp = 0;

        switch (cmd & 7) {
        case 2: /* COMMAND phase */
                nxtdsp = NCB_SCRIPT_PHYS (np, dispatch);
                break;
#if 0
        case 3: /* STATUS  phase */
                nxtdsp = NCB_SCRIPT_PHYS (np, dispatch);
                break;
#endif
        case 6: /* MSG OUT phase */
                /*
                **      If the device may want to use untagged when we want 
                **      tagged, we prepare an IDENTIFY without disc. granted, 
                **      since we will not be able to handle reselect.
                **      Otherwise, we just don't care.
                */
                if      (dsp == NCB_SCRIPT_PHYS (np, send_ident)) {
                        if (cp->tag != NO_TAG && olen - rest <= 3) {
                                cp->host_status = HS_BUSY;
                                np->msgout[0] = M_IDENTIFY | cp->lun;
                                nxtdsp = NCB_SCRIPTH_PHYS (np, ident_break_atn);
                        }
                        else
                                nxtdsp = NCB_SCRIPTH_PHYS (np, ident_break);
                }
                else if (dsp == NCB_SCRIPTH_PHYS (np, send_wdtr) ||
                         dsp == NCB_SCRIPTH_PHYS (np, send_sdtr) ||
                         dsp == NCB_SCRIPTH_PHYS (np, send_ppr)) {
                        nxtdsp = NCB_SCRIPTH_PHYS (np, nego_bad_phase);
                }
                break;
#if 0
        case 7: /* MSG IN  phase */
                nxtdsp = NCB_SCRIPT_PHYS (np, clrack);
                break;
#endif
        }

        if (nxtdsp) {
                OUTL_DSP (nxtdsp);
                return;
        }

reset_all:
        ncr_start_reset(np);
}

/*==========================================================
**
**      ncr chip handler for QUEUE FULL and CHECK CONDITION
**
**==========================================================
**
**      On QUEUE FULL status, we set the actual tagged command 
**      queue depth to the number of disconnected CCBs that is 
**      hopefully a good value to avoid further QUEUE FULL.
**
**      On CHECK CONDITION or COMMAND TERMINATED, we use the  
**      CCB of the failed command for performing a REQUEST 
**      SENSE SCSI command.
**
**      We do not want to change the order commands will be 
**      actually queued to the device after we received a 
**      QUEUE FULL status. We also want to properly deal with 
**      contingent allegiance condition. For these reasons, 
**      we remove from the start queue all commands for this 
**      LUN that haven't been yet queued to the device and 
**      put them back in the correponding LUN queue, then  
**      requeue the CCB that failed in front of the LUN queue.
**      I just hope this not to be performed too often. :)
**
**      If we are using IMMEDIATE ARBITRATION, we clear the 
**      IARB hint for every commands we encounter in order not 
**      to be stuck with a won arbitration and no job to queue 
**      to a device.
**----------------------------------------------------------
*/

static void ncr_sir_to_redo(ncb_p np, int num, ccb_p cp)
{
        Scsi_Cmnd *cmd  = cp->cmd;
        tcb_p tp        = &np->target[cp->target];
        lcb_p lp        = ncr_lp(np, tp, cp->lun);
        ccb_p           cp2;
        int             busyccbs = 1;
        u_int32         startp;
        u_char          s_status = INB (SS_PRT);
        int             msglen;
        int             i, j;


        /*
        **      If the LCB is not yet available, then only 
        **      1 IO is accepted, so we should have it.
        */
        if (!lp)
                goto next;      
        /*
        **      Remove all CCBs queued to the chip for that LUN and put 
        **      them back in the LUN CCB wait queue.
        */
        busyccbs = lp->queuedccbs;
        i = (INL (nc_scratcha) - np->p_squeue) / 4;
        j = i;
        while (i != np->squeueput) {
                cp2 = ncr_ccb_from_dsa(np, scr_to_cpu(np->squeue[i]));
                assert(cp2);
#ifdef SCSI_NCR_IARB_SUPPORT
                /* IARB hints may not be relevant any more. Forget them. */
                cp2->host_flags &= ~HF_HINT_IARB;
#endif
                if (cp2 && cp2->target == cp->target && cp2->lun == cp->lun) {
                        xpt_remque(&cp2->link_ccbq);
                        xpt_insque_head(&cp2->link_ccbq, &lp->wait_ccbq);
                        --lp->queuedccbs;
                        cp2->queued = 0;
                }
                else {
                        if (i != j)
                                np->squeue[j] = np->squeue[i];
                        if ((j += 2) >= MAX_START*2) j = 0;
                }
                if ((i += 2) >= MAX_START*2) i = 0;
        }
        if (i != j)             /* Copy back the idle task if needed */
                np->squeue[j] = np->squeue[i];
        np->squeueput = j;      /* Update our current start queue pointer */

        /*
        **      Requeue the interrupted CCB in front of the 
        **      LUN CCB wait queue to preserve ordering.
        */
        xpt_remque(&cp->link_ccbq);
        xpt_insque_head(&cp->link_ccbq, &lp->wait_ccbq);
        --lp->queuedccbs;
        cp->queued = 0;

next:

#ifdef SCSI_NCR_IARB_SUPPORT
        /* IARB hint may not be relevant any more. Forget it. */
        cp->host_flags &= ~HF_HINT_IARB;
        if (np->last_cp)
                np->last_cp = 0;
#endif

        /*
        **      Now we can restart the SCRIPTS processor safely.
        */
        OUTL_DSP (NCB_SCRIPT_PHYS (np, start));

        switch(s_status) {
        default:
        case S_BUSY:
                ncr_complete(np, cp);
                break;
        case S_QUEUE_FULL:
                if (!lp || !lp->queuedccbs) {
                        ncr_complete(np, cp);
                        break;
                }
                if (bootverbose >= 1) {
                        PRINT_ADDR(cmd);
                        printk ("QUEUE FULL! %d busy, %d disconnected CCBs\n",
                                busyccbs, lp->queuedccbs);
                }
                /*
                **      Decrease number of tags to the number of 
                **      disconnected commands.
                */
                if (lp->queuedccbs < lp->numtags) {
                        lp->numtags     = lp->queuedccbs;
                        lp->num_good    = 0;
                        ncr_setup_tags (np, cp->target, cp->lun);
                }
                /*
                **      Repair the offending CCB.
                */
                cp->phys.header.savep   = cp->startp;
                cp->phys.header.lastp   = cp->lastp0;
                cp->host_status         = HS_BUSY;
                cp->scsi_status         = S_ILLEGAL;
                cp->xerr_status         = 0;
                cp->extra_bytes         = 0;
                cp->host_flags          &= (HF_PM_TO_C|HF_DATA_IN);

                break;

        case S_TERMINATED:
        case S_CHECK_COND:
                /*
                **      If we were requesting sense, give up.
                */
                if (cp->host_flags & HF_AUTO_SENSE) {
                        ncr_complete(np, cp);
                        break;
                }

                /*
                **      Save SCSI status and extended error.
                **      Compute the data residual now.
                */
                cp->sv_scsi_status = cp->scsi_status;
                cp->sv_xerr_status = cp->xerr_status;
                cp->resid = ncr_compute_residual(np, cp);

                /*
                **      Device returned CHECK CONDITION status.
                **      Prepare all needed data strutures for getting 
                **      sense data.
                */

                /*
                **      identify message
                */
                cp->scsi_smsg2[0]       = M_IDENTIFY | cp->lun;
                msglen = 1;

                /*
                **      If we are currently using anything different from 
                **      async. 8 bit data transfers with that target,
                **      start a negotiation, since the device may want 
                **      to report us a UNIT ATTENTION condition due to 
                **      a cause we currently ignore, and we donnot want 
                **      to be stuck with WIDE and/or SYNC data transfer.
                **
                **      cp->nego_status is filled by ncr_prepare_nego().
                **
                **      Do NOT negotiate if performing integrity check
                **      or if integrity check has completed, all check
                **      conditions will have been cleared.
                */

#ifdef  SCSI_NCR_INTEGRITY_CHECKING
                if (DEBUG_FLAGS & DEBUG_IC) {
                printk("%s: ncr_sir_to_redo: ic_done %2X, in_progress %2X\n",
                        ncr_name(np), tp->ic_done, cp->cmd->ic_in_progress);
                }

                /*
                **      If parity error during integrity check,
                **      set the target width to narrow. Otherwise,
                **      do not negotiate on a request sense.
                */
                if ( np->check_integ_par && np->check_integrity 
                                                && cp->cmd->ic_in_progress ) { 
                        cp->nego_status = 0;
                        msglen +=
                            ncr_ic_nego (np, cp, cmd ,&cp->scsi_smsg2[msglen]);
                }

                if (!np->check_integrity || 
                        (np->check_integrity && 
                                (!cp->cmd->ic_in_progress && !tp->ic_done)) ) { 
                    ncr_negotiate(np, tp);
                    cp->nego_status = 0;
                    {
                        u_char sync_offset;
                        if ((np->device_id == PCI_DEVICE_ID_LSI_53C1010) ||
                                        (np->device_id == PCI_DEVICE_ID_LSI_53C1010_66))
                                sync_offset = tp->sval & 0x3f;
                        else
                                sync_offset = tp->sval & 0x1f;

                        if ((tp->wval & EWS) || sync_offset)
                          msglen +=
                            ncr_prepare_nego (np, cp, &cp->scsi_smsg2[msglen]);
                    }

                }
#else
                ncr_negotiate(np, tp);
                cp->nego_status = 0;
                if ((tp->wval & EWS) || (tp->sval & 0x1f))
                        msglen +=
                            ncr_prepare_nego (np, cp, &cp->scsi_smsg2[msglen]);
#endif  /* SCSI_NCR_INTEGRITY_CHECKING */

                /*
                **      Message table indirect structure.
                */
                cp->phys.smsg.addr      = cpu_to_scr(CCB_PHYS (cp, scsi_smsg2));
                cp->phys.smsg.size      = cpu_to_scr(msglen);

                /*
                **      sense command
                */
                cp->phys.cmd.addr       = cpu_to_scr(CCB_PHYS (cp, sensecmd));
                cp->phys.cmd.size       = cpu_to_scr(6);

                /*
                **      patch requested size into sense command
                */
                cp->sensecmd[0]         = 0x03;
                cp->sensecmd[1]         = cp->lun << 5;
                cp->sensecmd[4]         = sizeof(cp->sense_buf);

                /*
                **      sense data
                */
                bzero(cp->sense_buf, sizeof(cp->sense_buf));
                cp->phys.sense.addr     = cpu_to_scr(CCB_PHYS(cp,sense_buf[0]));
                cp->phys.sense.size     = cpu_to_scr(sizeof(cp->sense_buf));

                /*
                **      requeue the command.
                */
                startp = NCB_SCRIPTH_PHYS (np, sdata_in);

                cp->phys.header.savep   = cpu_to_scr(startp);
                cp->phys.header.goalp   = cpu_to_scr(startp + 16);
                cp->phys.header.lastp   = cpu_to_scr(startp);
                cp->phys.header.wgoalp  = cpu_to_scr(startp + 16);
                cp->phys.header.wlastp  = cpu_to_scr(startp);

                cp->host_status = cp->nego_status ? HS_NEGOTIATE : HS_BUSY;
                cp->scsi_status = S_ILLEGAL;
                cp->host_flags  = (HF_AUTO_SENSE|HF_DATA_IN);

                cp->phys.header.go.start =
                        cpu_to_scr(NCB_SCRIPT_PHYS (np, select));

                /*
                **      If lp not yet allocated, requeue the command.
                */
                if (!lp)
                        ncr_put_start_queue(np, cp);
                break;
        }

        /*
        **      requeue awaiting scsi commands for this lun.
        */
        if (lp)
                ncr_start_next_ccb(np, lp, 1);

        return;
}

/*----------------------------------------------------------
**
**      After a device has accepted some management message 
**      as BUS DEVICE RESET, ABORT TASK, etc ..., or when 
**      a device signals a UNIT ATTENTION condition, some 
**      tasks are thrown away by the device. We are required 
**      to reflect that on our tasks list since the device 
**      will never complete these tasks.
**
**      This function completes all disconnected CCBs for a 
**      given target that matches the following criteria:
**      - lun=-1  means any logical UNIT otherwise a given one.
**      - task=-1 means any task, otherwise a given one.
**----------------------------------------------------------
*/
static int ncr_clear_tasks(ncb_p np, u_char hsts, 
                           int target, int lun, int task)
{
        int i = 0;
        ccb_p cp;

        for (cp = np->ccbc; cp; cp = cp->link_ccb) {
                if (cp->host_status != HS_DISCONNECT)
                        continue;
                if (cp->target != target)
                        continue;
                if (lun != -1 && cp->lun != lun)
                        continue;
                if (task != -1 && cp->tag != NO_TAG && cp->scsi_smsg[2] != task)
                        continue;
                cp->host_status = hsts;
                cp->scsi_status = S_ILLEGAL;
                ncr_complete(np, cp);
                ++i;
        }
        return i;
}

/*==========================================================
**
**      ncr chip handler for TASKS recovery.
**
**==========================================================
**
**      We cannot safely abort a command, while the SCRIPTS 
**      processor is running, since we just would be in race 
**      with it.
**
**      As long as we have tasks to abort, we keep the SEM 
**      bit set in the ISTAT. When this bit is set, the 
**      SCRIPTS processor interrupts (SIR_SCRIPT_STOPPED) 
**      each time it enters the scheduler.
**
**      If we have to reset a target, clear tasks of a unit,
**      or to perform the abort of a disconnected job, we 
**      restart the SCRIPTS for selecting the target. Once 
**      selected, the SCRIPTS interrupts (SIR_TARGET_SELECTED).
**      If it loses arbitration, the SCRIPTS will interrupt again 
**      the next time it will enter its scheduler, and so on ...
**
**      On SIR_TARGET_SELECTED, we scan for the more 
**      appropriate thing to do:
**
**      - If nothing, we just sent a M_ABORT message to the 
**        target to get rid of the useless SCSI bus ownership.
**        According to the specs, no tasks shall be affected.
**      - If the target is to be reset, we send it a M_RESET 
**        message.
**      - If a logical UNIT is to be cleared , we send the 
**        IDENTIFY(lun) + M_ABORT.
**      - If an untagged task is to be aborted, we send the 
**        IDENTIFY(lun) + M_ABORT.
**      - If a tagged task is to be aborted, we send the 
**        IDENTIFY(lun) + task attributes + M_ABORT_TAG.
**
**      Once our 'kiss of death' :) message has been accepted 
**      by the target, the SCRIPTS interrupts again 
**      (SIR_ABORT_SENT). On this interrupt, we complete 
**      all the CCBs that should have been aborted by the 
**      target according to our message.
**      
**----------------------------------------------------------
*/
static void ncr_sir_task_recovery(ncb_p np, int num)
{
        ccb_p cp;
        tcb_p tp;
        int target=-1, lun=-1, task;
        int i, k;
        u_char *p;

        switch(num) {
        /*
        **      The SCRIPTS processor stopped before starting
        **      the next command in order to allow us to perform 
        **      some task recovery.
        */
        case SIR_SCRIPT_STOPPED:

                /*
                **      Do we have any target to reset or unit to clear ?
                */
                for (i = 0 ; i < MAX_TARGET ; i++) {
                        tp = &np->target[i];
                        if (tp->to_reset || (tp->l0p && tp->l0p->to_clear)) {
                                target = i;
                                break;
                        }
                        if (!tp->lmp)
                                continue;
                        for (k = 1 ; k < MAX_LUN ; k++) {
                                if (tp->lmp[k] && tp->lmp[k]->to_clear) {
                                        target  = i;
                                        break;
                                }
                        }
                        if (target != -1)
                                break;
                }

                /*
                **      If not, look at the CCB list for any 
                **      disconnected CCB to be aborted.
                */
                if (target == -1) {
                        for (cp = np->ccbc; cp; cp = cp->link_ccb) {
                                if (cp->host_status != HS_DISCONNECT)
                                        continue;
                                if (cp->to_abort) {
                                        target = cp->target;
                                        break;
                                }
                        }
                }

                /*
                **      If some target is to be selected, 
                **      prepare and start the selection.
                */
                if (target != -1) {
                        tp = &np->target[target];
                        np->abrt_sel.sel_id     = target;
                        np->abrt_sel.sel_scntl3 = tp->wval;
                        np->abrt_sel.sel_sxfer  = tp->sval;
                        np->abrt_sel.sel_scntl4 = tp->uval;
                        OUTL(nc_dsa, np->p_ncb);
                        OUTL_DSP (NCB_SCRIPTH_PHYS (np, sel_for_abort));
                        return;
                }

                /*
                **      Nothing is to be selected, so we donnot need 
                **      to synchronize with the SCRIPTS anymore.
                **      Remove the SEM flag from the ISTAT.
                */
                np->istat_sem = 0;
                OUTB (nc_istat, SIGP);

                /*
                **      Now look at CCBs to abort that haven't started yet.
                **      Remove all those CCBs from the start queue and 
                **      complete them with appropriate status.
                **      Btw, the SCRIPTS processor is still stopped, so 
                **      we are not in race.
                */
                for (cp = np->ccbc; cp; cp = cp->link_ccb) {
                        if (cp->host_status != HS_BUSY &&
                            cp->host_status != HS_NEGOTIATE)
                                continue;
                        if (!cp->to_abort)
                                continue;
#ifdef SCSI_NCR_IARB_SUPPORT
                        /*
                        **    If we are using IMMEDIATE ARBITRATION, we donnot 
                        **    want to cancel the last queued CCB, since the 
                        **    SCRIPTS may have anticipated the selection.
                        */
                        if (cp == np->last_cp) {
                                cp->to_abort = 0;
                                continue;
                        }
#endif
                        /*
                        **      Compute index of next position in the start 
                        **      queue the SCRIPTS will schedule.
                        */
                        i = (INL (nc_scratcha) - np->p_squeue) / 4;

                        /*
                        **      Remove the job from the start queue.
                        */
                        k = -1;
                        while (1) {
                                if (i == np->squeueput)
                                        break;
                                if (k == -1) {          /* Not found yet */
                                        if (cp == ncr_ccb_from_dsa(np,
                                                     scr_to_cpu(np->squeue[i])))
                                                k = i;  /* Found */
                                }
                                else {
                                        /*
                                        **    Once found, we have to move 
                                        **    back all jobs by 1 position.
                                        */
                                        np->squeue[k] = np->squeue[i];
                                        k += 2;
                                        if (k >= MAX_START*2)
                                                k = 0;
                                }

                                i += 2;
                                if (i >= MAX_START*2)
                                        i = 0;
                        }
                        /*
                        **      If job removed, repair the start queue.
                        */
                        if (k != -1) {
                                np->squeue[k] = np->squeue[i]; /* Idle task */
                                np->squeueput = k; /* Start queue pointer */
                        }
                        cp->host_status = HS_ABORTED;
                        cp->scsi_status = S_ILLEGAL;
                        ncr_complete(np, cp);
                }
                break;
        /*
        **      The SCRIPTS processor has selected a target 
        **      we may have some manual recovery to perform for.
        */
        case SIR_TARGET_SELECTED:
                target = (INB (nc_sdid) & 0xf);
                tp = &np->target[target];

                np->abrt_tbl.addr = cpu_to_scr(vtobus(np->abrt_msg));

                /*
                **      If the target is to be reset, prepare a 
                **      M_RESET message and clear the to_reset flag 
                **      since we donnot expect this operation to fail.
                */
                if (tp->to_reset) {
                        np->abrt_msg[0] = M_RESET;
                        np->abrt_tbl.size = 1;
                        tp->to_reset = 0;
                        break;
                }

                /*
                **      Otherwise, look for some logical unit to be cleared.
                */
                if (tp->l0p && tp->l0p->to_clear)
                        lun = 0;
                else if (tp->lmp) {
                        for (k = 1 ; k < MAX_LUN ; k++) {
                                if (tp->lmp[k] && tp->lmp[k]->to_clear) {
                                        lun = k;
                                        break;
                                }
                        }
                }

                /*
                **      If a logical unit is to be cleared, prepare 
                **      an IDENTIFY(lun) + ABORT MESSAGE.
                */
                if (lun != -1) {
                        lcb_p lp = ncr_lp(np, tp, lun);
                        lp->to_clear = 0; /* We donnot expect to fail here */
                        np->abrt_msg[0] = M_IDENTIFY | lun;
                        np->abrt_msg[1] = M_ABORT;
                        np->abrt_tbl.size = 2;
                        break;
                }

                /*
                **      Otherwise, look for some disconnected job to 
                **      abort for this target.
                */
                for (cp = np->ccbc; cp; cp = cp->link_ccb) {
                        if (cp->host_status != HS_DISCONNECT)
                                continue;
                        if (cp->target != target)
                                continue;
                        if (cp->to_abort)
                                break;
                }

                /*
                **      If we have none, probably since the device has 
                **      completed the command before we won abitration,
                **      send a M_ABORT message without IDENTIFY.
                **      According to the specs, the device must just 
                **      disconnect the BUS and not abort any task.
                */
                if (!cp) {
                        np->abrt_msg[0] = M_ABORT;
                        np->abrt_tbl.size = 1;
                        break;
                }

                /*
                **      We have some task to abort.
                **      Set the IDENTIFY(lun)
                */
                np->abrt_msg[0] = M_IDENTIFY | cp->lun;

                /*
                **      If we want to abort an untagged command, we 
                **      will send a IDENTIFY + M_ABORT.
                **      Otherwise (tagged command), we will send 
                **      a IDENTITFY + task attributes + ABORT TAG.
                */
                if (cp->tag == NO_TAG) {
                        np->abrt_msg[1] = M_ABORT;
                        np->abrt_tbl.size = 2;
                }
                else {
                        np->abrt_msg[1] = cp->scsi_smsg[1];
                        np->abrt_msg[2] = cp->scsi_smsg[2];
                        np->abrt_msg[3] = M_ABORT_TAG;
                        np->abrt_tbl.size = 4;
                }
                cp->to_abort = 0; /* We donnot expect to fail here */
                break;

        /*
        **      The target has accepted our message and switched 
        **      to BUS FREE phase as we expected.
        */
        case SIR_ABORT_SENT:
                target = (INB (nc_sdid) & 0xf);
                tp = &np->target[target];
                
                /*
                **      If we didn't abort anything, leave here.
                */
                if (np->abrt_msg[0] == M_ABORT)
                        break;

                /*
                **      If we sent a M_RESET, then a hardware reset has 
                **      been performed by the target.
                **      - Reset everything to async 8 bit
                **      - Tell ourself to negotiate next time :-)
                **      - Prepare to clear all disconnected CCBs for 
                **        this target from our task list (lun=task=-1)
                */
                lun = -1;
                task = -1;
                if (np->abrt_msg[0] == M_RESET) {
                        tp->sval = 0;
                        tp->wval = np->rv_scntl3;
                        tp->uval = np->rv_scntl4; 
                        ncr_set_sync_wide_status(np, target);
                        ncr_negotiate(np, tp);
                }

                /*
                **      Otherwise, check for the LUN and TASK(s) 
                **      concerned by the cancelation.
                **      If it is not ABORT_TAG then it is CLEAR_QUEUE 
                **      or an ABORT message :-)
                */
                else {
                        lun = np->abrt_msg[0] & 0x3f;
                        if (np->abrt_msg[1] == M_ABORT_TAG)
                                task = np->abrt_msg[2];
                }

                /*
                **      Complete all the CCBs the device should have 
                **      aborted due to our 'kiss of death' message.
                */
                (void) ncr_clear_tasks(np, HS_ABORTED, target, lun, task);
                break;

        /*
        **      We have performed a auto-sense that succeeded.
        **      If the device reports a UNIT ATTENTION condition 
        **      due to a RESET condition, we must complete all 
        **      disconnect CCBs for this unit since the device 
        **      shall have thrown them away.
        **      Since I haven't time to guess what the specs are 
        **      expecting for other UNIT ATTENTION conditions, I 
        **      decided to only care about RESET conditions. :)
        */
        case SIR_AUTO_SENSE_DONE:
                cp = ncr_ccb_from_dsa(np, INL (nc_dsa));
                if (!cp)
                        break;
                memcpy(cp->cmd->sense_buffer, cp->sense_buf,
                       sizeof(cp->cmd->sense_buffer));
                p  = &cp->cmd->sense_buffer[0];

                if (p[0] != 0x70 || p[2] != 0x6 || p[12] != 0x29)
                        break;
#if 0
                (void) ncr_clear_tasks(np, HS_RESET, cp->target, cp->lun, -1);
#endif
                break;
        }

        /*
        **      Print to the log the message we intend to send.
        */
        if (num == SIR_TARGET_SELECTED) {
                PRINT_TARGET(np, target);
                ncr_printl_hex("control msgout:", np->abrt_msg,
                              np->abrt_tbl.size);
                np->abrt_tbl.size = cpu_to_scr(np->abrt_tbl.size);
        }

        /*
        **      Let the SCRIPTS processor continue.
        */
        OUTONB_STD ();
}


/*==========================================================
**
**      Gérard's alchemy:) that deals with with the data 
**      pointer for both MDP and the residual calculation.
**
**==========================================================
**
**      I didn't want to bloat the code by more than 200 
**      lignes for the handling of both MDP and the residual.
**      This has been achieved by using a data pointer 
**      representation consisting in an index in the data 
**      array (dp_sg) and a negative offset (dp_ofs) that 
**      have the following meaning:
**
**      - dp_sg = MAX_SCATTER
**        we are at the end of the data script.
**      - dp_sg < MAX_SCATTER
**        dp_sg points to the next entry of the scatter array 
**        we want to transfer.
**      - dp_ofs < 0
**        dp_ofs represents the residual of bytes of the 
**        previous entry scatter entry we will send first.
**      - dp_ofs = 0
**        no residual to send first.
**
**      The function ncr_evaluate_dp() accepts an arbitray 
**      offset (basically from the MDP message) and returns 
**      the corresponding values of dp_sg and dp_ofs.
**
**----------------------------------------------------------
*/

static int ncr_evaluate_dp(ncb_p np, ccb_p cp, u_int32 scr, int *ofs)
{
        u_int32 dp_scr;
        int     dp_ofs, dp_sg, dp_sgmin;
        int     tmp;
        struct pm_ctx *pm;

        /*
        **      Compute the resulted data pointer in term of a script 
        **      address within some DATA script and a signed byte offset.
        */
        dp_scr = scr;
        dp_ofs = *ofs;
        if      (dp_scr == NCB_SCRIPT_PHYS (np, pm0_data))
                pm = &cp->phys.pm0;
        else if (dp_scr == NCB_SCRIPT_PHYS (np, pm1_data))
                pm = &cp->phys.pm1;
        else
                pm = 0;

        if (pm) {
                dp_scr  = scr_to_cpu(pm->ret);
                dp_ofs -= scr_to_cpu(pm->sg.size);
        }

        /*
        **      Deduce the index of the sg entry.
        **      Keep track of the index of the first valid entry.
        **      If result is dp_sg = MAX_SCATTER, then we are at the 
        **      end of the data and vice-versa.
        */
        tmp = scr_to_cpu(cp->phys.header.goalp);
        dp_sg = MAX_SCATTER;
        if (dp_scr != tmp)
                dp_sg -= (tmp - 8 - (int)dp_scr) / (SCR_SG_SIZE*4);
        dp_sgmin = MAX_SCATTER - cp->segments;

        /*
        **      Move to the sg entry the data pointer belongs to.
        **
        **      If we are inside the data area, we expect result to be:
        **
        **      Either,
        **          dp_ofs = 0 and dp_sg is the index of the sg entry
        **          the data pointer belongs to (or the end of the data)
        **      Or,
        **          dp_ofs < 0 and dp_sg is the index of the sg entry 
        **          the data pointer belongs to + 1.
        */
        if (dp_ofs < 0) {
                int n;
                while (dp_sg > dp_sgmin) {
                        --dp_sg;
                        tmp = scr_to_cpu(cp->phys.data[dp_sg].size);
                        n = dp_ofs + (tmp & 0xffffff);
                        if (n > 0) {
                                ++dp_sg;
                                break;
                        }
                        dp_ofs = n;
                }
        }
        else if (dp_ofs > 0) {
                while (dp_sg < MAX_SCATTER) {
                        tmp = scr_to_cpu(cp->phys.data[dp_sg].size);
                        dp_ofs -= (tmp & 0xffffff);
                        ++dp_sg;
                        if (dp_ofs <= 0)
                                break;
                }
        }

        /*
        **      Make sure the data pointer is inside the data area.
        **      If not, return some error.
        */
        if      (dp_sg < dp_sgmin || (dp_sg == dp_sgmin && dp_ofs < 0))
                goto out_err;
        else if (dp_sg > MAX_SCATTER || (dp_sg == MAX_SCATTER && dp_ofs > 0))
                goto out_err;

        /*
        **      Save the extreme pointer if needed.
        */
        if (dp_sg > cp->ext_sg ||
            (dp_sg == cp->ext_sg && dp_ofs > cp->ext_ofs)) {
                cp->ext_sg  = dp_sg;
                cp->ext_ofs = dp_ofs;
        }

        /*
        **      Return data.
        */
        *ofs = dp_ofs;
        return dp_sg;

out_err:
        return -1;
}

/*==========================================================
**
**      ncr chip handler for MODIFY DATA POINTER MESSAGE
**
**==========================================================
**
**      We also call this function on IGNORE WIDE RESIDUE 
**      messages that do not match a SWIDE full condition.
**      Btw, we assume in that situation that such a message 
**      is equivalent to a MODIFY DATA POINTER (offset=-1).
**
**----------------------------------------------------------
*/

static void ncr_modify_dp(ncb_p np, tcb_p tp, ccb_p cp, int ofs)
{
        int dp_ofs      = ofs;
        u_int32 dp_scr  = INL (nc_temp);
        u_int32 dp_ret;
        u_int32 tmp;
        u_char  hflags;
        int     dp_sg;
        struct pm_ctx *pm;

        /*
        **      Not supported for auto_sense;
        */
        if (cp->host_flags & HF_AUTO_SENSE)
                goto out_reject;

        /*
        **      Apply our alchemy:) (see comments in ncr_evaluate_dp()), 
        **      to the resulted data pointer.
        */
        dp_sg = ncr_evaluate_dp(np, cp, dp_scr, &dp_ofs);
        if (dp_sg < 0)
                goto out_reject;

        /*
        **      And our alchemy:) allows to easily calculate the data 
        **      script address we want to return for the next data phase.
        */
        dp_ret = cpu_to_scr(cp->phys.header.goalp);
        dp_ret = dp_ret - 8 - (MAX_SCATTER - dp_sg) * (SCR_SG_SIZE*4);

        /*
        **      If offset / scatter entry is zero we donnot need 
        **      a context for the new current data pointer.
        */
        if (dp_ofs == 0) {
                dp_scr = dp_ret;
                goto out_ok;
        }

        /*
        **      Get a context for the new current data pointer.
        */
        hflags = INB (HF_PRT);

        if (hflags & HF_DP_SAVED)
                hflags ^= HF_ACT_PM;

        if (!(hflags & HF_ACT_PM)) {
                pm  = &cp->phys.pm0;
                dp_scr = NCB_SCRIPT_PHYS (np, pm0_data);
        }
        else {
                pm = &cp->phys.pm1;
                dp_scr = NCB_SCRIPT_PHYS (np, pm1_data);
        }

        hflags &= ~(HF_DP_SAVED);

        OUTB (HF_PRT, hflags);

        /*
        **      Set up the new current data pointer.
        **      ofs < 0 there, and for the next data phase, we 
        **      want to transfer part of the data of the sg entry 
        **      corresponding to index dp_sg-1 prior to returning 
        **      to the main data script.
        */
        pm->ret = cpu_to_scr(dp_ret);
        tmp  = scr_to_cpu(cp->phys.data[dp_sg-1].addr);
        tmp += scr_to_cpu(cp->phys.data[dp_sg-1].size) + dp_ofs;
        pm->sg.addr = cpu_to_scr(tmp);
        pm->sg.size = cpu_to_scr(-dp_ofs);

out_ok:
        OUTL (nc_temp, dp_scr);
        OUTL_DSP (NCB_SCRIPT_PHYS (np, clrack));
        return;

out_reject:
        OUTL_DSP (NCB_SCRIPTH_PHYS (np, msg_bad));
}


/*==========================================================
**
**      ncr chip calculation of the data residual.
**
**==========================================================
**
**      As I used to say, the requirement of data residual 
**      in SCSI is broken, useless and cannot be achieved 
**      without huge complexity.
**      But most OSes and even the official CAM require it.
**      When stupidity happens to be so widely spread inside 
**      a community, it gets hard to convince.
**
**      Anyway, I don't care, since I am not going to use 
**      any software that considers this data residual as 
**      a relevant information. :)
**      
**----------------------------------------------------------
*/

static int ncr_compute_residual(ncb_p np, ccb_p cp)
{
        int dp_sg, dp_sgmin, tmp;
        int resid=0;
        int dp_ofs = 0;

        /*
         *      Check for some data lost or just thrown away.
         *      We are not required to be quite accurate in this
         *      situation. Btw, if we are odd for output and the
         *      device claims some more data, it may well happen
         *      than our residual be zero. :-)
         */
        if (cp->xerr_status & (XE_EXTRA_DATA|XE_SODL_UNRUN|XE_SWIDE_OVRUN)) {
                if (cp->xerr_status & XE_EXTRA_DATA)
                        resid -= cp->extra_bytes;
                if (cp->xerr_status & XE_SODL_UNRUN)
                        ++resid;
                if (cp->xerr_status & XE_SWIDE_OVRUN)
                        --resid;
        }


        /*
        **      If SCRIPTS reaches its goal point, then 
        **      there is no additionnal residual.
        */
        if (cp->phys.header.lastp == cp->phys.header.goalp)
                return resid;

        /*
        **      If the last data pointer is data_io (direction 
        **      unknown), then no data transfer should have 
        **      taken place.
        */
        if (cp->phys.header.lastp == NCB_SCRIPTH_PHYS (np, data_io))
                return cp->data_len;

        /*
        **      If no data transfer occurs, or if the data
        **      pointer is weird, return full residual.
        */
        if (cp->startp == cp->phys.header.lastp ||
            ncr_evaluate_dp(np, cp, scr_to_cpu(cp->phys.header.lastp),
                            &dp_ofs) < 0) {
                return cp->data_len;
        }

        /*
        **      We are now full comfortable in the computation 
        **      of the data residual (2's complement).
        */
        dp_sgmin = MAX_SCATTER - cp->segments;
        resid = -cp->ext_ofs;
        for (dp_sg = cp->ext_sg; dp_sg < MAX_SCATTER; ++dp_sg) {
                tmp = scr_to_cpu(cp->phys.data[dp_sg].size);
                resid += (tmp & 0xffffff);
        }

        /*
        **      Hopefully, the result is not too wrong.
        */
        return resid;
}

/*==========================================================
**
**      Print out the containt of a SCSI message.
**
**==========================================================
*/

static int ncr_show_msg (u_char * msg)
{
        u_char i;
        printk ("%x",*msg);
        if (*msg==M_EXTENDED) {
                for (i=1;i<8;i++) {
                        if (i-1>msg[1]) break;
                        printk ("-%x",msg[i]);
                };
                return (i+1);
        } else if ((*msg & 0xf0) == 0x20) {
                printk ("-%x",msg[1]);
                return (2);
        };
        return (1);
}

static void ncr_print_msg (ccb_p cp, char *label, u_char *msg)
{
        if (cp)
                PRINT_ADDR(cp->cmd);
        if (label)
                printk ("%s: ", label);

        (void) ncr_show_msg (msg);
        printk (".\n");
}

/*===================================================================
**
**      Negotiation for WIDE and SYNCHRONOUS DATA TRANSFER.
**
**===================================================================
**
**      Was Sie schon immer ueber transfermode negotiation wissen wollten ...
**
**      We try to negotiate sync and wide transfer only after
**      a successful inquire command. We look at byte 7 of the
**      inquire data to determine the capabilities of the target.
**
**      When we try to negotiate, we append the negotiation message
**      to the identify and (maybe) simple tag message.
**      The host status field is set to HS_NEGOTIATE to mark this
**      situation.
**
**      If the target doesn't answer this message immediately
**      (as required by the standard), the SIR_NEGO_FAILED interrupt
**      will be raised eventually.
**      The handler removes the HS_NEGOTIATE status, and sets the
**      negotiated value to the default (async / nowide).
**
**      If we receive a matching answer immediately, we check it
**      for validity, and set the values.
**
**      If we receive a Reject message immediately, we assume the
**      negotiation has failed, and fall back to standard values.
**
**      If we receive a negotiation message while not in HS_NEGOTIATE
**      state, it's a target initiated negotiation. We prepare a
**      (hopefully) valid answer, set our parameters, and send back 
**      this answer to the target.
**
**      If the target doesn't fetch the answer (no message out phase),
**      we assume the negotiation has failed, and fall back to default
**      settings (SIR_NEGO_PROTO interrupt).
**
**      When we set the values, we adjust them in all ccbs belonging 
**      to this target, in the controller's register, and in the "phys"
**      field of the controller's struct ncb.
**
**---------------------------------------------------------------------
*/

/*==========================================================
**
**      ncr chip handler for SYNCHRONOUS DATA TRANSFER 
**      REQUEST (SDTR) message.
**
**==========================================================
**
**      Read comments above.
**
**----------------------------------------------------------
*/
static void ncr_sync_nego(ncb_p np, tcb_p tp, ccb_p cp)
{
        u_char  scntl3, scntl4;
        u_char  chg, ofs, per, fak;

        /*
        **      Synchronous request message received.
        */

        if (DEBUG_FLAGS & DEBUG_NEGO) {
                ncr_print_msg(cp, "sync msg in", np->msgin);
        };

        /*
        **      get requested values.
        */

        chg = 0;
        per = np->msgin[3];
        ofs = np->msgin[4];
        if (ofs==0) per=255;

        /*
        **      if target sends SDTR message,
        **            it CAN transfer synch.
        */

        if (ofs)
                tp->inq_byte7 |= INQ7_SYNC;

        /*
        **      check values against driver limits.
        */

        if (per < np->minsync)
                {chg = 1; per = np->minsync;}
        if (per < tp->minsync)
                {chg = 1; per = tp->minsync;}
        if (ofs > np->maxoffs_st)
                {chg = 1; ofs = np->maxoffs_st;}
        if (ofs > tp->maxoffs)
                {chg = 1; ofs = tp->maxoffs;}

        /*
        **      Check against controller limits.
        */
        fak     = 7;
        scntl3  = 0;
        scntl4  = 0;
        if (ofs != 0) {
                ncr_getsync(np, per, &fak, &scntl3);
                if (fak > 7) {
                        chg = 1;
                        ofs = 0;
                }
        }
        if (ofs == 0) {
                fak     = 7;
                per     = 0;
                scntl3  = 0;
                scntl4  = 0;
                tp->minsync = 0;
        }

        if (DEBUG_FLAGS & DEBUG_NEGO) {
                PRINT_ADDR(cp->cmd);
                printk ("sync: per=%d scntl3=0x%x scntl4=0x%x ofs=%d fak=%d chg=%d.\n",
                        per, scntl3, scntl4, ofs, fak, chg);
        }

        if (INB (HS_PRT) == HS_NEGOTIATE) {
                OUTB (HS_PRT, HS_BUSY);
                switch (cp->nego_status) {
                case NS_SYNC:
                        /*
                        **      This was an answer message
                        */
                        if (chg) {
                                /*
                                **      Answer wasn't acceptable.
                                */
                                ncr_setsync (np, cp, 0, 0xe0, 0);
                                OUTL_DSP (NCB_SCRIPTH_PHYS (np, msg_bad));
                        } else {
                                /*
                                **      Answer is ok.
                                */
                                if ((np->device_id != PCI_DEVICE_ID_LSI_53C1010) &&
                                        (np->device_id != PCI_DEVICE_ID_LSI_53C1010_66))
                                  ncr_setsync (np, cp, scntl3, (fak<<5)|ofs,0);
                                else
                                  ncr_setsync (np, cp, scntl3, ofs, scntl4);

                                OUTL_DSP (NCB_SCRIPT_PHYS (np, clrack));
                        };
                        return;

                case NS_WIDE:
                        ncr_setwide (np, cp, 0, 0);
                        break;
                };
        };

        /*
        **      It was a request. Set value and
        **      prepare an answer message
        */

        if ((np->device_id != PCI_DEVICE_ID_LSI_53C1010) &&
                        (np->device_id != PCI_DEVICE_ID_LSI_53C1010_66))
                ncr_setsync (np, cp, scntl3, (fak<<5)|ofs,0);
        else
                ncr_setsync (np, cp, scntl3, ofs, scntl4);

        np->msgout[0] = M_EXTENDED;
        np->msgout[1] = 3;
        np->msgout[2] = M_X_SYNC_REQ;
        np->msgout[3] = per;
        np->msgout[4] = ofs;

        cp->nego_status = NS_SYNC;

        if (DEBUG_FLAGS & DEBUG_NEGO) {
                ncr_print_msg(cp, "sync msgout", np->msgout);
        }

        np->msgin [0] = M_NOOP;

        if (!ofs)
                OUTL_DSP (NCB_SCRIPTH_PHYS (np, msg_bad));
        else
                OUTL_DSP (NCB_SCRIPTH_PHYS (np, sdtr_resp));
}

/*==========================================================
**
**      ncr chip handler for WIDE DATA TRANSFER REQUEST 
**      (WDTR) message.
**
**==========================================================
**
**      Read comments above.
**
**----------------------------------------------------------
*/
static void ncr_wide_nego(ncb_p np, tcb_p tp, ccb_p cp)
{
        u_char  chg, wide;

        /*
        **      Wide request message received.
        */
        if (DEBUG_FLAGS & DEBUG_NEGO) {
                ncr_print_msg(cp, "wide msgin", np->msgin);
        };

        /*
        **      get requested values.
        */

        chg  = 0;
        wide = np->msgin[3];

        /*
        **      if target sends WDTR message,
        **            it CAN transfer wide.
        */

        if (wide)
                tp->inq_byte7 |= INQ7_WIDE16;

        /*
        **      check values against driver limits.
        */

        if (wide > tp->usrwide)
                {chg = 1; wide = tp->usrwide;}

        if (DEBUG_FLAGS & DEBUG_NEGO) {
                PRINT_ADDR(cp->cmd);
                printk ("wide: wide=%d chg=%d.\n", wide, chg);
        }

        if (INB (HS_PRT) == HS_NEGOTIATE) {
                OUTB (HS_PRT, HS_BUSY);
                switch (cp->nego_status) {
                case NS_WIDE:
                        /*
                        **      This was an answer message
                        */
                        if (chg) {
                                /*
                                **      Answer wasn't acceptable.
                                */
                                ncr_setwide (np, cp, 0, 1);
                                OUTL_DSP (NCB_SCRIPTH_PHYS (np, msg_bad));
                        } else {
                                /*
                                **      Answer is ok.
                                */
                                ncr_setwide (np, cp, wide, 1);
                                OUTL_DSP (NCB_SCRIPT_PHYS (np, clrack));
                        };
                        return;

                case NS_SYNC:
                        ncr_setsync (np, cp, 0, 0xe0, 0);
                        break;
                };
        };

        /*
        **      It was a request, set value and
        **      prepare an answer message
        */

        ncr_setwide (np, cp, wide, 1);

        np->msgout[0] = M_EXTENDED;
        np->msgout[1] = 2;
        np->msgout[2] = M_X_WIDE_REQ;
        np->msgout[3] = wide;

        np->msgin [0] = M_NOOP;

        cp->nego_status = NS_WIDE;

        if (DEBUG_FLAGS & DEBUG_NEGO) {
                ncr_print_msg(cp, "wide msgout", np->msgout);
        }

        OUTL_DSP (NCB_SCRIPTH_PHYS (np, wdtr_resp));
}
/*==========================================================
**
**      ncr chip handler for PARALLEL PROTOCOL REQUEST 
**      (PPR) message.
**
**==========================================================
**
**      Read comments above.
**
**----------------------------------------------------------
*/
static void ncr_ppr_nego(ncb_p np, tcb_p tp, ccb_p cp)
{
        u_char  scntl3, scntl4;
        u_char  chg, ofs, per, fak, wth, dt;

        /*
        **      PPR message received.
        */

        if (DEBUG_FLAGS & DEBUG_NEGO) {
                ncr_print_msg(cp, "ppr msg in", np->msgin);
        };

        /*
        **      get requested values.
        */

        chg = 0;
        per = np->msgin[3];
        ofs = np->msgin[5];
        wth = np->msgin[6];
        dt  = np->msgin[7];
        if (ofs==0) per=255;

        /*
        **      if target sends sync (wide),
        **            it CAN transfer synch (wide).
        */

        if (ofs)
                tp->inq_byte7 |= INQ7_SYNC;

        if (wth)
                tp->inq_byte7 |= INQ7_WIDE16;

        /*
        **      check values against driver limits.
        */

        if (wth > tp->usrwide)
                {chg = 1; wth = tp->usrwide;}
        if (per < np->minsync)
                {chg = 1; per = np->minsync;}
        if (per < tp->minsync)
                {chg = 1; per = tp->minsync;}
        if (ofs > tp->maxoffs)
                {chg = 1; ofs = tp->maxoffs;}

        /*
        **      Check against controller limits.
        */
        fak     = 7;
        scntl3  = 0;
        scntl4  = 0;
        if (ofs != 0) {
                scntl4 = dt ? 0x80 : 0;
                ncr_getsync(np, per, &fak, &scntl3);
                if (fak > 7) {
                        chg = 1;
                        ofs = 0;
                }
        }
        if (ofs == 0) {
                fak     = 7;
                per     = 0;
                scntl3  = 0;
                scntl4  = 0;
                tp->minsync = 0;
        }

        /*
        **      If target responds with Ultra 3 speed
        **      but narrow or not DT, reject.
        **      If target responds with DT request 
        **      but not Ultra3 speeds, reject message,
        **      reset min sync for target to 0x0A and
        **      set flags to re-negotiate.
        */

        if   ((per == 0x09) && ofs && (!wth || !dt))  
                chg = 1;
        else if (( (per > 0x09) && dt) ) 
                chg = 2;

        /* Not acceptable since beyond controller limit */
        if (!dt && ofs > np->maxoffs_st)
                {chg = 2; ofs = np->maxoffs_st;}

        if (DEBUG_FLAGS & DEBUG_NEGO) {
                PRINT_ADDR(cp->cmd);
                printk ("ppr: wth=%d per=%d scntl3=0x%x scntl4=0x%x ofs=%d fak=%d chg=%d.\n",
                        wth, per, scntl3, scntl4, ofs, fak, chg);
        }

        if (INB (HS_PRT) == HS_NEGOTIATE) {
                OUTB (HS_PRT, HS_BUSY);
                switch (cp->nego_status) {
                case NS_PPR:
                        /*
                        **      This was an answer message
                        */
                        if (chg) {
                                /*
                                **      Answer wasn't acceptable.
                                */
                                if (chg == 2) {
                                        /* Send message reject and reset flags for
                                        ** host to re-negotiate with min period 0x0A.
                                        */
                                        tp->minsync = 0x0A;
                                        tp->period = 0;
                                        tp->widedone = 0;
                                }
                                ncr_setsyncwide (np, cp, 0, 0xe0, 0, 0);
                                OUTL_DSP (NCB_SCRIPTH_PHYS (np, msg_bad));
                        } else {
                                /*
                                **      Answer is ok.
                                */

                                if ((np->device_id != PCI_DEVICE_ID_LSI_53C1010) &&
                                        (np->device_id != PCI_DEVICE_ID_LSI_53C1010_66))
                                  ncr_setsyncwide (np, cp, scntl3, (fak<<5)|ofs,0, wth);
                                else
                                  ncr_setsyncwide (np, cp, scntl3, ofs, scntl4, wth);

                                OUTL_DSP (NCB_SCRIPT_PHYS (np, clrack));
                                
                        };
                        return;

                case NS_SYNC:
                        ncr_setsync (np, cp, 0, 0xe0, 0);
                        break;

                case NS_WIDE:
                        ncr_setwide (np, cp, 0, 0);
                        break;
                };
        };

        /*
        **      It was a request. Set value and
        **      prepare an answer message
        **
        **      If narrow or not DT and requesting Ultra3
        **      slow the bus down and force ST. If not
        **      requesting Ultra3, force ST.
        **      Max offset is 31=0x1f if ST mode.
        */

        if  ((per == 0x09) && ofs && (!wth || !dt)) {
                per = 0x0A;
                dt = 0;
        }
        else if ( (per > 0x09) && dt) {
                dt = 0;
        }
        if (!dt && ofs > np->maxoffs_st)
                ofs = np->maxoffs_st;

        if ((np->device_id != PCI_DEVICE_ID_LSI_53C1010) &&
                        (np->device_id != PCI_DEVICE_ID_LSI_53C1010_66))
                ncr_setsyncwide (np, cp, scntl3, (fak<<5)|ofs,0, wth);
        else
                ncr_setsyncwide (np, cp, scntl3, ofs, scntl4, wth);

        np->msgout[0] = M_EXTENDED;
        np->msgout[1] = 6;
        np->msgout[2] = M_X_PPR_REQ;
        np->msgout[3] = per;
        np->msgout[4] = 0;              
        np->msgout[5] = ofs;
        np->msgout[6] = wth;
        np->msgout[7] = dt;

        cp->nego_status = NS_PPR;

        if (DEBUG_FLAGS & DEBUG_NEGO) {
                ncr_print_msg(cp, "ppr msgout", np->msgout);
        }

        np->msgin [0] = M_NOOP;

        if (!ofs)
                OUTL_DSP (NCB_SCRIPTH_PHYS (np, msg_bad));
        else
                OUTL_DSP (NCB_SCRIPTH_PHYS (np, ppr_resp));
}



/*
**      Reset SYNC or WIDE to default settings.
**      Called when a negotiation does not succeed either 
**      on rejection or on protocol error.
*/
static void ncr_nego_default(ncb_p np, tcb_p tp, ccb_p cp)
{
        /*
        **      any error in negotiation:
        **      fall back to default mode.
        */
        switch (cp->nego_status) {

        case NS_SYNC:
                ncr_setsync (np, cp, 0, 0xe0, 0);
                break;

        case NS_WIDE:
                ncr_setwide (np, cp, 0, 0);
                break;

        case NS_PPR:
                /*
                 * ppr_negotiation is set to 1 on the first ppr nego command.
                 * If ppr is successful, it is reset to 2.
                 * If unsuccessful it is reset to 0.
                 */
                if (DEBUG_FLAGS & DEBUG_NEGO) {
                        tcb_p tp=&np->target[cp->target];
                        u_char factor, offset, width;

                        ncr_get_xfer_info ( np, tp, &factor, &offset, &width);

                        printk("Current factor %d offset %d width %d\n",
                                factor, offset, width); 
                }
                if (tp->ppr_negotiation == 2)
                        ncr_setsyncwide (np, cp, 0, 0xe0, 0, 0);
                else if (tp->ppr_negotiation == 1) {

                        /* First ppr command has received a  M REJECT.
                         * Do not change the existing wide/sync parameter
                         * values (asyn/narrow if this as the first nego;
                         * may be different if target initiates nego.).
                         */
                        tp->ppr_negotiation = 0;
                }
                else
                {
                        tp->ppr_negotiation = 0;
                        ncr_setwide (np, cp, 0, 0);
                }
                break;
        };
        np->msgin [0] = M_NOOP;
        np->msgout[0] = M_NOOP;
        cp->nego_status = 0;
}

/*==========================================================
**
**      ncr chip handler for MESSAGE REJECT received for 
**      a WIDE or SYNCHRONOUS negotiation.
**
**      clear the PPR negotiation flag, all future nego.
**      will be SDTR and WDTR
**
**==========================================================
**
**      Read comments above.
**
**----------------------------------------------------------
*/
static void ncr_nego_rejected(ncb_p np, tcb_p tp, ccb_p cp)
{
        ncr_nego_default(np, tp, cp);
        OUTB (HS_PRT, HS_BUSY);
}


/*==========================================================
**
**
**      ncr chip exception handler for programmed interrupts.
**
**
**==========================================================
*/

void ncr_int_sir (ncb_p np)
{
        u_char  num     = INB (nc_dsps);
        u_long  dsa     = INL (nc_dsa);
        ccb_p   cp      = ncr_ccb_from_dsa(np, dsa);
        u_char  target  = INB (nc_sdid) & 0x0f;
        tcb_p   tp      = &np->target[target];
        int     tmp;

        if (DEBUG_FLAGS & DEBUG_TINY) printk ("I#%d", num);

        switch (num) {
        /*
        **      See comments in the SCRIPTS code.
        */
#ifdef SCSI_NCR_PCIQ_SYNC_ON_INTR
        case SIR_DUMMY_INTERRUPT:
                goto out;
#endif

        /*
        **      The C code is currently trying to recover from something.
        **      Typically, user want to abort some command.
        */
        case SIR_SCRIPT_STOPPED:
        case SIR_TARGET_SELECTED:
        case SIR_ABORT_SENT:
        case SIR_AUTO_SENSE_DONE:
                ncr_sir_task_recovery(np, num);
                return;
        /*
        **      The device didn't go to MSG OUT phase after having 
        **      been selected with ATN. We donnot want to handle 
        **      that.
        */
        case SIR_SEL_ATN_NO_MSG_OUT:
                printk ("%s:%d: No MSG OUT phase after selection with ATN.\n",
                        ncr_name (np), target);
                goto out_stuck;
        /*
        **      The device didn't switch to MSG IN phase after 
        **      having reseleted the initiator.
        */
        case SIR_RESEL_NO_MSG_IN:
        /*
        **      After reselection, the device sent a message that wasn't 
        **      an IDENTIFY.
        */
        case SIR_RESEL_NO_IDENTIFY:
                /*
                **      If devices reselecting without sending an IDENTIFY 
                **      message still exist, this should help.
                **      We just assume lun=0, 1 CCB, no tag.
                */
                if (tp->l0p) { 
                        OUTL (nc_dsa, scr_to_cpu(tp->l0p->tasktbl[0]));
                        OUTL_DSP (NCB_SCRIPT_PHYS (np, resel_go));
                        return;
                }
        /*
        **      The device reselected a LUN we donnot know of.
        */
        case SIR_RESEL_BAD_LUN:
                np->msgout[0] = M_RESET;
                goto out;
        /*
        **      The device reselected for an untagged nexus and we 
        **      haven't any.
        */
        case SIR_RESEL_BAD_I_T_L:
                np->msgout[0] = M_ABORT;
                goto out;
        /*
        **      The device reselected for a tagged nexus that we donnot 
        **      have.
        */
        case SIR_RESEL_BAD_I_T_L_Q:
                np->msgout[0] = M_ABORT_TAG;
                goto out;
        /*
        **      The SCRIPTS let us know that the device has grabbed 
        **      our message and will abort the job.
        */
        case SIR_RESEL_ABORTED:
                np->lastmsg = np->msgout[0];
                np->msgout[0] = M_NOOP;
                printk ("%s:%d: message %x sent on bad reselection.\n",
                        ncr_name (np), target, np->lastmsg);
                goto out;
        /*
        **      The SCRIPTS let us know that a message has been 
        **      successfully sent to the device.
        */
        case SIR_MSG_OUT_DONE:
                np->lastmsg = np->msgout[0];
                np->msgout[0] = M_NOOP;
                /* Should we really care of that */
                if (np->lastmsg == M_PARITY || np->lastmsg == M_ID_ERROR) {
                        if (cp) {
                                cp->xerr_status &= ~XE_PARITY_ERR;
                                if (!cp->xerr_status)
                                        OUTOFFB (HF_PRT, HF_EXT_ERR);
                        }
                }
                goto out;
        /*
        **      The device didn't send a GOOD SCSI status.
        **      We may have some work to do prior to allow 
        **      the SCRIPTS processor to continue.
        */
        case SIR_BAD_STATUS:
                if (!cp)
                        goto out;
                ncr_sir_to_redo(np, num, cp);
                return;
        /*
        **      We are asked by the SCRIPTS to prepare a 
        **      REJECT message.
        */
        case SIR_REJECT_TO_SEND:
                ncr_print_msg(cp, "M_REJECT to send for ", np->msgin);
                np->msgout[0] = M_REJECT;
                goto out;
        /*
        **      We have been ODD at the end of a DATA IN 
        **      transfer and the device didn't send a 
        **      IGNORE WIDE RESIDUE message.
        **      It is a data overrun condition.
        */
        case SIR_SWIDE_OVERRUN:
                if (cp) {
                        OUTONB (HF_PRT, HF_EXT_ERR);
                        cp->xerr_status |= XE_SWIDE_OVRUN;
                }
                goto out;
        /*
        **      We have been ODD at the end of a DATA OUT 
        **      transfer.
        **      It is a data underrun condition.
        */
        case SIR_SODL_UNDERRUN:
                if (cp) {
                        OUTONB (HF_PRT, HF_EXT_ERR);
                        cp->xerr_status |= XE_SODL_UNRUN;
                }
                goto out;
        /*
        **      The device wants us to tranfer more data than 
        **      expected or in the wrong direction.
        **      The number of extra bytes is in scratcha.
        **      It is a data overrun condition.
        */
        case SIR_DATA_OVERRUN:
                if (cp) {
                        OUTONB (HF_PRT, HF_EXT_ERR);
                        cp->xerr_status |= XE_EXTRA_DATA;
                        cp->extra_bytes += INL (nc_scratcha);
                }
                goto out;
        /*
        **      The device switched to an illegal phase (4/5).
        */
        case SIR_BAD_PHASE:
                if (cp) {
                        OUTONB (HF_PRT, HF_EXT_ERR);
                        cp->xerr_status |= XE_BAD_PHASE;
                }
                goto out;
        /*
        **      We received a message.
        */
        case SIR_MSG_RECEIVED:
                if (!cp)
                        goto out_stuck;
                switch (np->msgin [0]) {
                /*
                **      We received an extended message.
                **      We handle MODIFY DATA POINTER, SDTR, WDTR 
                **      and reject all other extended messages.
                */
                case M_EXTENDED:
                        switch (np->msgin [2]) {
                        case M_X_MODIFY_DP:
                                if (DEBUG_FLAGS & DEBUG_POINTER)
                                        ncr_print_msg(cp,"modify DP",np->msgin);
                                tmp = (np->msgin[3]<<24) + (np->msgin[4]<<16) + 
                                      (np->msgin[5]<<8)  + (np->msgin[6]);
                                ncr_modify_dp(np, tp, cp, tmp);
                                return;
                        case M_X_SYNC_REQ:
                                ncr_sync_nego(np, tp, cp);
                                return;
                        case M_X_WIDE_REQ:
                                ncr_wide_nego(np, tp, cp);
                                return;
                        case M_X_PPR_REQ:
                                ncr_ppr_nego(np, tp, cp);
                                return;
                        default:
                                goto out_reject;
                        }
                        break;
                /*
                **      We received a 1/2 byte message not handled from SCRIPTS.
                **      We are only expecting MESSAGE REJECT and IGNORE WIDE 
                **      RESIDUE messages that haven't been anticipated by 
                **      SCRIPTS on SWIDE full condition. Unanticipated IGNORE 
                **      WIDE RESIDUE messages are aliased as MODIFY DP (-1).
                */
                case M_IGN_RESIDUE:
                        if (DEBUG_FLAGS & DEBUG_POINTER)
                                ncr_print_msg(cp,"ign wide residue", np->msgin);
                        ncr_modify_dp(np, tp, cp, -1);
                        return;
                case M_REJECT:
                        if (INB (HS_PRT) == HS_NEGOTIATE)
                                ncr_nego_rejected(np, tp, cp);
                        else {
                                PRINT_ADDR(cp->cmd);
                                printk ("M_REJECT received (%x:%x).\n",
                                        scr_to_cpu(np->lastmsg), np->msgout[0]);
                        }
                        goto out_clrack;
                        break;
                default:
                        goto out_reject;
                }
                break;
        /*
        **      We received an unknown message.
        **      Ignore all MSG IN phases and reject it.
        */
        case SIR_MSG_WEIRD:
                ncr_print_msg(cp, "WEIRD message received", np->msgin);
                OUTL_DSP (NCB_SCRIPTH_PHYS (np, msg_weird));
                return;
        /*
        **      Negotiation failed.
        **      Target does not send us the reply.
        **      Remove the HS_NEGOTIATE status.
        */
        case SIR_NEGO_FAILED:
                OUTB (HS_PRT, HS_BUSY);
        /*
        **      Negotiation failed.
        **      Target does not want answer message.
        */
        case SIR_NEGO_PROTO:
                ncr_nego_default(np, tp, cp);
                goto out;
        };

out:
        OUTONB_STD ();
        return;
out_reject:
        OUTL_DSP (NCB_SCRIPTH_PHYS (np, msg_bad));
        return;
out_clrack:
        OUTL_DSP (NCB_SCRIPT_PHYS (np, clrack));
        return;
out_stuck:
        return;
}


/*==========================================================
**
**
**      Acquire a control block
**
**
**==========================================================
*/

static  ccb_p ncr_get_ccb (ncb_p np, u_char tn, u_char ln)
{
        tcb_p tp = &np->target[tn];
        lcb_p lp = ncr_lp(np, tp, ln);
        u_short tag = NO_TAG;
        XPT_QUEHEAD *qp;
        ccb_p cp = (ccb_p) 0;

        /*
        **      Allocate a new CCB if needed.
        */
        if (xpt_que_empty(&np->free_ccbq))
                (void) ncr_alloc_ccb(np);

        /*
        **      Look for a free CCB
        */
        qp = xpt_remque_head(&np->free_ccbq);
        if (!qp)
                goto out;
        cp = xpt_que_entry(qp, struct ccb, link_ccbq);

        /*
        **      If the LCB is not yet available and we already 
        **      have queued a CCB for a LUN without LCB,
        **      give up. Otherwise all is fine. :-)
        */
        if (!lp) {
                if (xpt_que_empty(&np->b0_ccbq))
                        xpt_insque_head(&cp->link_ccbq, &np->b0_ccbq);
                else
                        goto out_free;
        } else {
                /*
                **      Tune tag mode if asked by user.
                */
                if (lp->queuedepth != lp->numtags) {
                        ncr_setup_tags(np, tn, ln);
                }

                /*
                **      Get a tag for this nexus if required.
                **      Keep from using more tags than we can handle.
                */
                if (lp->usetags) {
                        if (lp->busyccbs < lp->maxnxs) {
                                tag = lp->cb_tags[lp->ia_tag];
                                ++lp->ia_tag;
                                if (lp->ia_tag == MAX_TAGS)
                                        lp->ia_tag = 0;
                                cp->tags_si = lp->tags_si;
                                ++lp->tags_sum[cp->tags_si];
                        }
                        else
                                goto out_free;
                }

                /*
                **      Put the CCB in the LUN wait queue and 
                **      count it as busy.
                */
                xpt_insque_tail(&cp->link_ccbq, &lp->wait_ccbq);
                ++lp->busyccbs;
        }

        /*
        **      Remember all informations needed to free this CCB.
        */
        cp->to_abort = 0;
        cp->tag    = tag;
        cp->target = tn;
        cp->lun    = ln;

        if (DEBUG_FLAGS & DEBUG_TAGS) {
                PRINT_LUN(np, tn, ln);
                printk ("ccb @%p using tag %d.\n", cp, tag);
        }

out:
        return cp;
out_free:
        xpt_insque_head(&cp->link_ccbq, &np->free_ccbq);
        return (ccb_p) 0;
}

/*==========================================================
**
**
**      Release one control block
**
**
**==========================================================
*/

static void ncr_free_ccb (ncb_p np, ccb_p cp)
{
        tcb_p tp = &np->target[cp->target];
        lcb_p lp = ncr_lp(np, tp, cp->lun);

        if (DEBUG_FLAGS & DEBUG_TAGS) {
                PRINT_LUN(np, cp->target, cp->lun);
                printk ("ccb @%p freeing tag %d.\n", cp, cp->tag);
        }

        /*
        **      If lun control block available, make available 
        **      the task slot and the tag if any.
        **      Decrement counters.
        */
        if (lp) {
                if (cp->tag != NO_TAG) {
                        lp->cb_tags[lp->if_tag++] = cp->tag;
                        if (lp->if_tag == MAX_TAGS)
                                lp->if_tag = 0;
                        --lp->tags_sum[cp->tags_si];
                        lp->tasktbl[cp->tag] = cpu_to_scr(np->p_bad_i_t_l_q);
                } else {
                        lp->tasktbl[0] = cpu_to_scr(np->p_bad_i_t_l);
                }
                --lp->busyccbs;
                if (cp->queued) {
                        --lp->queuedccbs;
                }
        }

        /*
        **      Make this CCB available.
        */
        xpt_remque(&cp->link_ccbq);
        xpt_insque_head(&cp->link_ccbq, &np->free_ccbq);
        cp -> host_status = HS_IDLE;
        cp -> queued = 0;
}

/*------------------------------------------------------------------------
**      Allocate a CCB and initialize its fixed part.
**------------------------------------------------------------------------
**------------------------------------------------------------------------
*/
static ccb_p ncr_alloc_ccb(ncb_p np)
{
        ccb_p cp = 0;
        int hcode;

        /*
        **      Allocate memory for this CCB.
        */
        cp = m_calloc_dma(sizeof(struct ccb), "CCB");
        if (!cp)
                return 0;

        /*
        **      Count it and initialyze it.
        */
        np->actccbs++;

        /*
        **      Remember virtual and bus address of this ccb.
        */
        cp->p_ccb          = vtobus(cp);

        /*
        **      Insert this ccb into the hashed list.
        */
        hcode = CCB_HASH_CODE(cp->p_ccb);
        cp->link_ccbh = np->ccbh[hcode];
        np->ccbh[hcode] = cp;

        /*
        **      Initialyze the start and restart actions.
        */
        cp->phys.header.go.start   = cpu_to_scr(NCB_SCRIPT_PHYS (np, idle));
        cp->phys.header.go.restart = cpu_to_scr(NCB_SCRIPTH_PHYS(np,bad_i_t_l));

        /*
        **      Initilialyze some other fields.
        */
        cp->phys.smsg_ext.addr = cpu_to_scr(NCB_PHYS(np, msgin[2]));

        /*
        **      Chain into wakeup list and free ccb queue.
        */
        cp->link_ccb    = np->ccbc;
        np->ccbc        = cp;

        xpt_insque_head(&cp->link_ccbq, &np->free_ccbq);

        return cp;
}

/*------------------------------------------------------------------------
**      Look up a CCB from a DSA value.
**------------------------------------------------------------------------
**------------------------------------------------------------------------
*/
static ccb_p ncr_ccb_from_dsa(ncb_p np, u_long dsa)
{
        int hcode;
        ccb_p cp;

        hcode = CCB_HASH_CODE(dsa);
        cp = np->ccbh[hcode];
        while (cp) {
                if (cp->p_ccb == dsa)
                        break;
                cp = cp->link_ccbh;
        }

        return cp;
}

/*==========================================================
**
**
**      Allocation of resources for Targets/Luns/Tags.
**
**
**==========================================================
*/


/*------------------------------------------------------------------------
**      Target control block initialisation.
**------------------------------------------------------------------------
**      This data structure is fully initialized after a SCSI command 
**      has been successfully completed for this target.
**------------------------------------------------------------------------
*/
static void ncr_init_tcb (ncb_p np, u_char tn)
{
        /*
        **      Check some alignments required by the chip.
        */      
        assert (( (offsetof(struct ncr_reg, nc_sxfer) ^
                offsetof(struct tcb    , sval    )) &3) == 0);
        assert (( (offsetof(struct ncr_reg, nc_scntl3) ^
                offsetof(struct tcb    , wval    )) &3) == 0);
        if ((np->device_id == PCI_DEVICE_ID_LSI_53C1010) ||
                (np->device_id == PCI_DEVICE_ID_LSI_53C1010_66)){
                assert (( (offsetof(struct ncr_reg, nc_scntl4) ^
                        offsetof(struct tcb    , uval    )) &3) == 0);
        }
}

/*------------------------------------------------------------------------
**      Lun control block allocation and initialization.
**------------------------------------------------------------------------
**      This data structure is allocated and initialized after a SCSI 
**      command has been successfully completed for this target/lun.
**------------------------------------------------------------------------
*/
static lcb_p ncr_alloc_lcb (ncb_p np, u_char tn, u_char ln)
{
        tcb_p tp = &np->target[tn];
        lcb_p lp = ncr_lp(np, tp, ln);

        /*
        **      Already done, return.
        */
        if (lp)
                return lp;

        /*
        **      Initialize the target control block if not yet.
        */
        ncr_init_tcb(np, tn);

        /*
        **      Allocate the lcb bus address array.
        **      Compute the bus address of this table.
        */
        if (ln && !tp->luntbl) {
                int i;

                tp->luntbl = m_calloc_dma(256, "LUNTBL");
                if (!tp->luntbl)
                        goto fail;
                for (i = 0 ; i < 64 ; i++)
                        tp->luntbl[i] = cpu_to_scr(NCB_PHYS(np, resel_badlun));
                tp->b_luntbl = cpu_to_scr(vtobus(tp->luntbl));
        }

        /*
        **      Allocate the table of pointers for LUN(s) > 0, if needed.
        */
        if (ln && !tp->lmp) {
                tp->lmp = m_calloc(MAX_LUN * sizeof(lcb_p), "LMP");
                if (!tp->lmp)
                        goto fail;
        }

        /*
        **      Allocate the lcb.
        **      Make it available to the chip.
        */
        lp = m_calloc_dma(sizeof(struct lcb), "LCB");
        if (!lp)
                goto fail;
        if (ln) {
                tp->lmp[ln] = lp;
                tp->luntbl[ln] = cpu_to_scr(vtobus(lp));
        }
        else {
                tp->l0p = lp;
                tp->b_lun0 = cpu_to_scr(vtobus(lp));
        }

        /*
        **      Initialize the CCB queue headers.
        */
        xpt_que_init(&lp->busy_ccbq);
        xpt_que_init(&lp->wait_ccbq);

        /*
        **      Set max CCBs to 1 and use the default task array 
        **      by default.
        */
        lp->maxnxs      = 1;
        lp->tasktbl     = &lp->tasktbl_0;
        lp->b_tasktbl   = cpu_to_scr(vtobus(lp->tasktbl));
        lp->tasktbl[0]  = cpu_to_scr(np->p_notask);
        lp->resel_task  = cpu_to_scr(NCB_SCRIPT_PHYS(np, resel_notag));

        /*
        **      Initialize command queuing control.
        */
        lp->busyccbs    = 1;
        lp->queuedccbs  = 1;
        lp->queuedepth  = 1;
fail:
        return lp;
}


/*------------------------------------------------------------------------
**      Lun control block setup on INQUIRY data received.
**------------------------------------------------------------------------
**      We only support WIDE, SYNC for targets and CMDQ for logical units.
**      This setup is done on each INQUIRY since we are expecting user 
**      will play with CHANGE DEFINITION commands. :-)
**------------------------------------------------------------------------
*/
static lcb_p ncr_setup_lcb (ncb_p np, u_char tn, u_char ln, u_char *inq_data)
{
        tcb_p tp = &np->target[tn];
        lcb_p lp = ncr_lp(np, tp, ln);
        u_char inq_byte7;
        int i;

        /*
        **      If no lcb, try to allocate it.
        */
        if (!lp && !(lp = ncr_alloc_lcb(np, tn, ln)))
                goto fail;

#if 0   /* No more used. Left here as provision */
        /*
        **      Get device quirks.
        */
        tp->quirks = 0;
        if (tp->quirks && bootverbose) {
                PRINT_LUN(np, tn, ln);
                printk ("quirks=%x.\n", tp->quirks);
        }
#endif

        /*
        **      Evaluate trustable target/unit capabilities.
        **      We only believe device version >= SCSI-2 that 
        **      use appropriate response data format (2).
        **      But it seems that some CCS devices also 
        **      support SYNC and I donnot want to frustrate 
        **      anybody. ;-)
        */
        inq_byte7 = 0;
        if      ((inq_data[2] & 0x7) >= 2 && (inq_data[3] & 0xf) == 2)
                inq_byte7 = inq_data[7];
        else if ((inq_data[2] & 0x7) == 1 && (inq_data[3] & 0xf) == 1)
                inq_byte7 = INQ7_SYNC;

        /*
        **      Throw away announced LUN capabilities if we are told 
        **      that there is no real device supported by the logical unit.
        */
        if ((inq_data[0] & 0xe0) > 0x20 || (inq_data[0] & 0x1f) == 0x1f)
                inq_byte7 &= (INQ7_SYNC | INQ7_WIDE16);

        /*
        **      If user is wanting SYNC, force this feature.
        */
        if (driver_setup.force_sync_nego)
                inq_byte7 |= INQ7_SYNC;

        /*
        **      Prepare negotiation if SIP capabilities have changed.
        */
        tp->inq_done = 1;
        if ((inq_byte7 ^ tp->inq_byte7) & (INQ7_SYNC | INQ7_WIDE16)) {
                tp->inq_byte7 = inq_byte7;
                ncr_negotiate(np, tp);
        }

        /*
        **      If unit supports tagged commands, allocate and 
        **      initialyze the task table if not yet.
        */
        if ((inq_byte7 & INQ7_QUEUE) && lp->tasktbl == &lp->tasktbl_0) {
                lp->tasktbl = m_calloc_dma(MAX_TASKS*4, "TASKTBL");
                if (!lp->tasktbl) {
                        lp->tasktbl = &lp->tasktbl_0;
                        goto fail;
                }
                lp->b_tasktbl = cpu_to_scr(vtobus(lp->tasktbl));
                for (i = 0 ; i < MAX_TASKS ; i++)
                        lp->tasktbl[i] = cpu_to_scr(np->p_notask);

                lp->cb_tags = m_calloc(MAX_TAGS, "CB_TAGS");
                if (!lp->cb_tags)
                        goto fail;
                for (i = 0 ; i < MAX_TAGS ; i++)
                        lp->cb_tags[i] = i;

                lp->maxnxs = MAX_TAGS;
                lp->tags_stime = ktime_get(3*HZ);
        }

        /*
        **      Adjust tagged queueing status if needed.
        */
        if ((inq_byte7 ^ lp->inq_byte7) & INQ7_QUEUE) {
                lp->inq_byte7 = inq_byte7;
                lp->numtags   = lp->maxtags;
                ncr_setup_tags (np, tn, ln);
        }

fail:
        return lp;
}

/*==========================================================
**
**
**      Build Scatter Gather Block
**
**
**==========================================================
**
**      The transfer area may be scattered among
**      several non adjacent physical pages.
**
**      We may use MAX_SCATTER blocks.
**
**----------------------------------------------------------
*/

/*
**      We try to reduce the number of interrupts caused
**      by unexpected phase changes due to disconnects.
**      A typical harddisk may disconnect before ANY block.
**      If we wanted to avoid unexpected phase changes at all
**      we had to use a break point every 512 bytes.
**      Of course the number of scatter/gather blocks is
**      limited.
**      Under Linux, the scatter/gatter blocks are provided by 
**      the generic driver. We just have to copy addresses and 
**      sizes to the data segment array.
*/

/*
**      For 64 bit systems, we use the 8 upper bits of the size field 
**      to provide bus address bits 32-39 to the SCRIPTS processor.
**      This allows the 895A and 896 to address up to 1 TB of memory.
**      For 32 bit chips on 64 bit systems, we must be provided with 
**      memory addresses that fit into the first 32 bit bus address 
**      range and so, this does not matter and we expect an error from 
**      the chip if this ever happen.
**
**      We use a separate function for the case Linux does not provide 
**      a scatter list in order to allow better code optimization 
**      for the case we have a scatter list (BTW, for now this just wastes  
**      about 40 bytes of code for x86, but my guess is that the scatter 
**      code will get more complex later).
*/

#define SCATTER_ONE(data, badd, len)                                    \
        (data)->addr = cpu_to_scr(badd);                                \
        (data)->size = cpu_to_scr((((badd) >> 8) & 0xff000000) + len);

#define CROSS_16MB(p, n) (((((u_long) p) + n - 1) ^ ((u_long) p)) & ~0xffffff)

static  int ncr_scatter_no_sglist(ncb_p np, ccb_p cp, Scsi_Cmnd *cmd)
{
        struct scr_tblmove *data = &cp->phys.data[MAX_SCATTER-1];
        int segment;

        cp->data_len = cmd->request_bufflen;

        if (cmd->request_bufflen) {
                dma_addr_t baddr = map_scsi_single_data(np, cmd);

                SCATTER_ONE(data, baddr, cmd->request_bufflen);
                if (CROSS_16MB(baddr, cmd->request_bufflen)) {
                        cp->host_flags |= HF_PM_TO_C;
#ifdef DEBUG_896R1
printk("He! we are crossing a 16 MB boundary (0x%lx, 0x%x)\n",
        baddr, cmd->request_bufflen);
#endif
                }
                segment = 1;
        }
        else
                segment = 0;

        return segment;
}

/*
**      DEL 472 - 53C896 Rev 1 - Part Number 609-0393055 - ITEM 5.
**
**      We disable data phase mismatch handling from SCRIPTS for data 
**      transfers that contains scatter/gather entries that cross  
**      a 16 MB boundary.
**      We use a different scatter function for 896 rev. 1 that needs 
**      such a work-around. Doing so, we do not affect performance for 
**      other chips.
**      This problem should not be triggered for disk IOs under Linux, 
**      since such IOs are performed using pages and buffers that are 
**      nicely power-of-two sized and aligned. But, since this may change 
**      at any time, a work-around was required.
*/
static int ncr_scatter_896R1(ncb_p np, ccb_p cp, Scsi_Cmnd *cmd)
{
        int segn;
        int use_sg = (int) cmd->use_sg;

        cp->data_len = 0;

        if (!use_sg)
                segn = ncr_scatter_no_sglist(np, cp, cmd);
        else {
                struct scatterlist *scatter = (struct scatterlist *)cmd->buffer;
                struct scr_tblmove *data;

                use_sg = map_scsi_sg_data(np, cmd);
                if (use_sg > MAX_SCATTER) {
                        unmap_scsi_data(np, cmd);
                        return -1;
                }

                data = &cp->phys.data[MAX_SCATTER - use_sg];

                for (segn = 0; segn < use_sg; segn++) {
                        dma_addr_t baddr = scsi_sg_dma_address(&scatter[segn]);
                        unsigned int len = scsi_sg_dma_len(&scatter[segn]);

                        SCATTER_ONE(&data[segn],
                                    baddr,
                                    len);
                        if (CROSS_16MB(baddr, scatter[segn].length)) {
                                cp->host_flags |= HF_PM_TO_C;
#ifdef DEBUG_896R1
printk("He! we are crossing a 16 MB boundary (0x%lx, 0x%x)\n",
        baddr, scatter[segn].length);
#endif
                        }
                        cp->data_len += len;
                }
        }

        return segn;
}

static int ncr_scatter(ncb_p np, ccb_p cp, Scsi_Cmnd *cmd)
{
        int segment;
        int use_sg = (int) cmd->use_sg;

        cp->data_len = 0;

        if (!use_sg)
                segment = ncr_scatter_no_sglist(np, cp, cmd);
        else {
                struct scatterlist *scatter = (struct scatterlist *)cmd->buffer;
                struct scr_tblmove *data;

                use_sg = map_scsi_sg_data(np, cmd);
                if (use_sg > MAX_SCATTER) {
                        unmap_scsi_data(np, cmd);
                        return -1;
                }
                data = &cp->phys.data[MAX_SCATTER - use_sg];

                for (segment = 0; segment < use_sg; segment++) {
                        dma_addr_t baddr = scsi_sg_dma_address(&scatter[segment]);
                        unsigned int len = scsi_sg_dma_len(&scatter[segment]);

                        SCATTER_ONE(&data[segment],
                                    baddr,
                                    len);
                        cp->data_len += len;
                }
        }

        return segment;
}

/*==========================================================
**
**
**      Test the pci bus snoop logic :-(
**
**      Has to be called with interrupts disabled.
**
**
**==========================================================
*/

#ifndef SCSI_NCR_IOMAPPED
static int __init ncr_regtest (struct ncb* np)
{
        register volatile u_int32 data;
        /*
        **      ncr registers may NOT be cached.
        **      write 0xffffffff to a read only register area,
        **      and try to read it back.
        */
        data = 0xffffffff;
        OUTL_OFF(offsetof(struct ncr_reg, nc_dstat), data);
        data = INL_OFF(offsetof(struct ncr_reg, nc_dstat));
#if 1
        if (data == 0xffffffff) {
#else
        if ((data & 0xe2f0fffd) != 0x02000080) {
#endif
                printk ("CACHE TEST FAILED: reg dstat-sstat2 readback %x.\n",
                        (unsigned) data);
                return (0x10);
        };
        return (0);
}
#endif

static int __init ncr_snooptest (struct ncb* np)
{
        u_int32 ncr_rd, ncr_wr, ncr_bk, host_rd, host_wr, pc;
        u_char  dstat;
        int     i, err=0;
#ifndef SCSI_NCR_IOMAPPED
        if (np->reg) {
            err |= ncr_regtest (np);
            if (err) return (err);
        }
#endif
restart_test:
        /*
        **      Enable Master Parity Checking as we intend 
        **      to enable it for normal operations.
        */
        OUTB (nc_ctest4, (np->rv_ctest4 & MPEE));
        /*
        **      init
        */
        pc  = NCB_SCRIPTH0_PHYS (np, snooptest);
        host_wr = 1;
        ncr_wr  = 2;
        /*
        **      Set memory and register.
        */
        np->ncr_cache = cpu_to_scr(host_wr);
        OUTL (nc_temp, ncr_wr);
        /*
        **      Start script (exchange values)
        */
        OUTL (nc_dsa, np->p_ncb);
        OUTL_DSP (pc);
        /*
        **      Wait 'til done (with timeout)
        */
        for (i=0; i<NCR_SNOOP_TIMEOUT; i++)
                if (INB(nc_istat) & (INTF|SIP|DIP))
                        break;
        if (i>=NCR_SNOOP_TIMEOUT) {
                printk ("CACHE TEST FAILED: timeout.\n");
                return (0x20);
        };
        /*
        **      Check for fatal DMA errors.
        */
        dstat = INB (nc_dstat);
#if 1   /* Band aiding for broken hardwares that fail PCI parity */
        if ((dstat & MDPE) && (np->rv_ctest4 & MPEE)) {
                printk ("%s: PCI DATA PARITY ERROR DETECTED - "
                        "DISABLING MASTER DATA PARITY CHECKING.\n",
                        ncr_name(np));
                np->rv_ctest4 &= ~MPEE;
                goto restart_test;
        }
#endif
        if (dstat & (MDPE|BF|IID)) {
                printk ("CACHE TEST FAILED: DMA error (dstat=0x%02x).", dstat);
                return (0x80);
        }
        /*
        **      Save termination position.
        */
        pc = INL (nc_dsp);
        /*
        **      Read memory and register.
        */
        host_rd = scr_to_cpu(np->ncr_cache);
        ncr_rd  = INL (nc_scratcha);
        ncr_bk  = INL (nc_temp);
        /*
        **      Check termination position.
        */
        if (pc != NCB_SCRIPTH0_PHYS (np, snoopend)+8) {
                printk ("CACHE TEST FAILED: script execution failed.\n");
                printk ("start=%08lx, pc=%08lx, end=%08lx\n", 
                        (u_long) NCB_SCRIPTH0_PHYS (np, snooptest), (u_long) pc,
                        (u_long) NCB_SCRIPTH0_PHYS (np, snoopend) +8);
                return (0x40);
        };
        /*
        **      Show results.
        */
        if (host_wr != ncr_rd) {
                printk ("CACHE TEST FAILED: host wrote %d, ncr read %d.\n",
                        (int) host_wr, (int) ncr_rd);
                err |= 1;
        };
        if (host_rd != ncr_wr) {
                printk ("CACHE TEST FAILED: ncr wrote %d, host read %d.\n",
                        (int) ncr_wr, (int) host_rd);
                err |= 2;
        };
        if (ncr_bk != ncr_wr) {
                printk ("CACHE TEST FAILED: ncr wrote %d, read back %d.\n",
                        (int) ncr_wr, (int) ncr_bk);
                err |= 4;
        };
        return (err);
}

/*==========================================================
**
**      Determine the ncr's clock frequency.
**      This is essential for the negotiation
**      of the synchronous transfer rate.
**
**==========================================================
**
**      Note: we have to return the correct value.
**      THERE IS NO SAFE DEFAULT VALUE.
**
**      Most NCR/SYMBIOS boards are delivered with a 40 Mhz clock.
**      53C860 and 53C875 rev. 1 support fast20 transfers but 
**      do not have a clock doubler and so are provided with a 
**      80 MHz clock. All other fast20 boards incorporate a doubler 
**      and so should be delivered with a 40 MHz clock.
**      The recent fast40 chips  (895/896/895A) and the
**      fast80 chip (C1010) use a 40 Mhz base clock 
**      and provide a clock quadrupler (160 Mhz). The code below 
**      tries to deal as cleverly as possible with all this stuff.
**
**----------------------------------------------------------
*/

/*
 *      Select NCR SCSI clock frequency
 */
static void ncr_selectclock(ncb_p np, u_char scntl3)
{
        if (np->multiplier < 2) {
                OUTB(nc_scntl3, scntl3);
                return;
        }

        if (bootverbose >= 2)
                printk ("%s: enabling clock multiplier\n", ncr_name(np));

        OUTB(nc_stest1, DBLEN);    /* Enable clock multiplier             */

        if ( (np->device_id != PCI_DEVICE_ID_LSI_53C1010) && 
                        (np->device_id != PCI_DEVICE_ID_LSI_53C1010_66) && 
                                                (np->multiplier > 2)) {  
                int i = 20;      /* Poll bit 5 of stest4 for quadrupler */
                while (!(INB(nc_stest4) & LCKFRQ) && --i > 0)
                        UDELAY (20);
                if (!i)
                    printk("%s: the chip cannot lock the frequency\n",
                                                 ncr_name(np));

        } else                  /* Wait 120 micro-seconds for multiplier*/
                UDELAY (120);

        OUTB(nc_stest3, HSC);           /* Halt the scsi clock          */
        OUTB(nc_scntl3, scntl3);
        OUTB(nc_stest1, (DBLEN|DBLSEL));/* Select clock multiplier      */
        OUTB(nc_stest3, 0x00);          /* Restart scsi clock           */
}


/*
 *      calculate NCR SCSI clock frequency (in KHz)
 */
static unsigned __init ncrgetfreq (ncb_p np, int gen)
{
        unsigned int ms = 0;
        unsigned int f;
        int count;

        /*
         * Measure GEN timer delay in order 
         * to calculate SCSI clock frequency
         *
         * This code will never execute too
         * many loop iterations (if DELAY is 
         * reasonably correct). It could get
         * too low a delay (too high a freq.)
         * if the CPU is slow executing the 
         * loop for some reason (an NMI, for
         * example). For this reason we will
         * if multiple measurements are to be 
         * performed trust the higher delay 
         * (lower frequency returned).
         */
        OUTW (nc_sien , 0x0);/* mask all scsi interrupts */
                                /* enable general purpose timer */
        (void) INW (nc_sist);   /* clear pending scsi interrupt */
        OUTB (nc_dien , 0);     /* mask all dma interrupts */
        (void) INW (nc_sist);   /* another one, just to be sure :) */
        OUTB (nc_scntl3, 4);    /* set pre-scaler to divide by 3 */
        OUTB (nc_stime1, 0);    /* disable general purpose timer */
        OUTB (nc_stime1, gen);  /* set to nominal delay of 1<<gen * 125us */
                                /* Temporary fix for udelay issue with Alpha
                                        platform */
        while (!(INW(nc_sist) & GEN) && ms++ < 100000) {
                /* count 1ms */
                for (count = 0; count < 10; count++)
                        UDELAY (100);   
        }
        OUTB (nc_stime1, 0);    /* disable general purpose timer */
        /*
         * set prescaler to divide by whatever 0 means
         * 0 ought to choose divide by 2, but appears
         * to set divide by 3.5 mode in my 53c810 ...
         */
        OUTB (nc_scntl3, 0);

        /*
         * adjust for prescaler, and convert into KHz 
         * scale values derived empirically.
         */
        f = ms ? ((1 << gen) * 4340) / ms : 0;

        if (bootverbose >= 2)
                printk ("%s: Delay (GEN=%d): %u msec, %u KHz\n",
                        ncr_name(np), gen, ms, f);

        return f;
}

static unsigned __init ncr_getfreq (ncb_p np)
{
        u_int f1, f2;
        int gen = 11;

        (void) ncrgetfreq (np, gen);    /* throw away first result */
        f1 = ncrgetfreq (np, gen);
        f2 = ncrgetfreq (np, gen);
        if (f1 > f2) f1 = f2;           /* trust lower result   */
        return f1;
}

/*
 *      Get/probe NCR SCSI clock frequency
 */
static void __init ncr_getclock (ncb_p np, int mult)
{
        unsigned char scntl3 = np->sv_scntl3;
        unsigned char stest1 = np->sv_stest1;
        unsigned f1;

        np->multiplier = 1;
        f1 = 40000;

        /*
        **      True with 875/895/896/895A with clock multiplier selected
        */
        if (mult > 1 && (stest1 & (DBLEN+DBLSEL)) == DBLEN+DBLSEL) {
                if (bootverbose >= 2)
                        printk ("%s: clock multiplier found\n", ncr_name(np));
                np->multiplier = mult;
        }

        /*
        **      If multiplier not found or scntl3 not 7,5,3,
        **      reset chip and get frequency from general purpose timer.
        **      Otherwise trust scntl3 BIOS setting.
        */
        if (np->multiplier != mult || (scntl3 & 7) < 3 || !(scntl3 & 1)) {
                OUTB (nc_stest1, 0);            /* make sure doubler is OFF */
                f1 = ncr_getfreq (np);

                if (bootverbose)
                        printk ("%s: NCR clock is %uKHz\n", ncr_name(np), f1);

                if      (f1 < 55000)            f1 =  40000;
                else                            f1 =  80000;

                /*
                **      Suggest to also check the PCI clock frequency 
                **      to make sure our frequency calculation algorithm 
                **      is not too biased.
                */
                if (np->features & FE_66MHZ) {
                        np->pciclock_min = (66000*55+80-1)/80;
                        np->pciclock_max = (66000*55)/40;
                }
                else {
                        np->pciclock_min = (33000*55+80-1)/80;
                        np->pciclock_max = (33000*55)/40;
                }

                if (f1 == 40000 && mult > 1) {
                        if (bootverbose >= 2)
                                printk ("%s: clock multiplier assumed\n", ncr_name(np));
                        np->multiplier  = mult;
                }
        } else {
                if      ((scntl3 & 7) == 3)     f1 =  40000;
                else if ((scntl3 & 7) == 5)     f1 =  80000;
                else                            f1 = 160000;

                f1 /= np->multiplier;
        }

        /*
        **      Compute controller synchronous parameters.
        */
        f1              *= np->multiplier;
        np->clock_khz   = f1;
}

/*
 *      Get/probe PCI clock frequency
 */
static u_int __init ncr_getpciclock (ncb_p np)
{
        static u_int f;

        OUTB (nc_stest1, SCLK); /* Use the PCI clock as SCSI clock */
        f = ncr_getfreq (np);
        OUTB (nc_stest1, 0);

        return f;
}

/*===================== LINUX ENTRY POINTS SECTION ==========================*/

#ifndef uchar
#define uchar unsigned char
#endif

#ifndef ushort
#define ushort unsigned short
#endif

#ifndef ulong
#define ulong unsigned long
#endif

/* ---------------------------------------------------------------------
**
**      Driver setup from the boot command line
**
** ---------------------------------------------------------------------
*/

#ifdef MODULE
#define ARG_SEP ' '
#else
#define ARG_SEP ','
#endif

#define OPT_TAGS                1
#define OPT_MASTER_PARITY       2
#define OPT_SCSI_PARITY         3
#define OPT_DISCONNECTION       4
#define OPT_SPECIAL_FEATURES    5
#define OPT_RESERVED_1          6
#define OPT_FORCE_SYNC_NEGO     7
#define OPT_REVERSE_PROBE       8
#define OPT_DEFAULT_SYNC        9
#define OPT_VERBOSE             10
#define OPT_DEBUG               11
#define OPT_BURST_MAX           12
#define OPT_LED_PIN             13
#define OPT_MAX_WIDE            14
#define OPT_SETTLE_DELAY        15
#define OPT_DIFF_SUPPORT        16
#define OPT_IRQM                17
#define OPT_PCI_FIX_UP          18
#define OPT_BUS_CHECK           19
#define OPT_OPTIMIZE            20
#define OPT_RECOVERY            21
#define OPT_SAFE_SETUP          22
#define OPT_USE_NVRAM           23
#define OPT_EXCLUDE             24
#define OPT_HOST_ID             25

#ifdef SCSI_NCR_IARB_SUPPORT
#define OPT_IARB                26
#endif

static char setup_token[] __initdata = 
        "tags:"   "mpar:"
        "spar:"   "disc:"
        "specf:"  "_rsvd1:"
        "fsn:"    "revprob:"
        "sync:"   "verb:"
        "debug:"  "burst:"
        "led:"    "wide:"
        "settle:" "diff:"
        "irqm:"   "pcifix:"
        "buschk:" "optim:"
        "recovery:"
        "safe:"   "nvram:"
        "excl:"   "hostid:"
#ifdef SCSI_NCR_IARB_SUPPORT
        "iarb:"
#endif
        ;       /* DONNOT REMOVE THIS ';' */

#ifdef MODULE
#define ARG_SEP ' '
#else
#define ARG_SEP ','
#endif

static int __init get_setup_token(char *p)
{
        char *cur = setup_token;
        char *pc;
        int i = 0;

        while (cur != NULL && (pc = strchr(cur, ':')) != NULL) {
                ++pc;
                ++i;
                if (!strncmp(p, cur, pc - cur))
                        return i;
                cur = pc;
        }
        return 0;
}


int __init sym53c8xx_setup(char *str)
{
#ifdef SCSI_NCR_BOOT_COMMAND_LINE_SUPPORT
        char *cur = str;
        char *pc, *pv;
        unsigned long val;
        int i,  c;
        int xi = 0;

        while (cur != NULL && (pc = strchr(cur, ':')) != NULL) {
                char *pe;

                val = 0;
                pv = pc;
                c = *++pv;

                if      (c == 'n')
                        val = 0;
                else if (c == 'y')
                        val = 1;
                else
                        val = (int) simple_strtoul(pv, &pe, 0);

                switch (get_setup_token(cur)) {
                case OPT_TAGS:
                        driver_setup.default_tags = val;
                        if (pe && *pe == '/') {
                                i = 0;
                                while (*pe && *pe != ARG_SEP && 
                                        i < sizeof(driver_setup.tag_ctrl)-1) {
                                        driver_setup.tag_ctrl[i++] = *pe++;
                                }
                                driver_setup.tag_ctrl[i] = '\0';
                        }
                        break;
                case OPT_MASTER_PARITY:
                        driver_setup.master_parity = val;
                        break;
                case OPT_SCSI_PARITY:
                        driver_setup.scsi_parity = val;
                        break;
                case OPT_DISCONNECTION:
                        driver_setup.disconnection = val;
                        break;
                case OPT_SPECIAL_FEATURES:
                        driver_setup.special_features = val;
                        break;
                case OPT_FORCE_SYNC_NEGO:
                        driver_setup.force_sync_nego = val;
                        break;
                case OPT_REVERSE_PROBE:
                        driver_setup.reverse_probe = val;
                        break;
                case OPT_DEFAULT_SYNC:
                        driver_setup.default_sync = val;
                        break;
                case OPT_VERBOSE:
                        driver_setup.verbose = val;
                        break;
                case OPT_DEBUG:
                        driver_setup.debug = val;
                        break;
                case OPT_BURST_MAX:
                        driver_setup.burst_max = val;
                        break;
                case OPT_LED_PIN:
                        driver_setup.led_pin = val;
                        break;
                case OPT_MAX_WIDE:
                        driver_setup.max_wide = val? 1:0;
                        break;
                case OPT_SETTLE_DELAY:
                        driver_setup.settle_delay = val;
                        break;
                case OPT_DIFF_SUPPORT:
                        driver_setup.diff_support = val;
                        break;
                case OPT_IRQM:
                        driver_setup.irqm = val;
                        break;
                case OPT_PCI_FIX_UP:
                        driver_setup.pci_fix_up = val;
                        break;
                case OPT_BUS_CHECK:
                        driver_setup.bus_check = val;
                        break;
                case OPT_OPTIMIZE:
                        driver_setup.optimize = val;
                        break;
                case OPT_RECOVERY:
                        driver_setup.recovery = val;
                        break;
                case OPT_USE_NVRAM:
                        driver_setup.use_nvram = val;
                        break;
                case OPT_SAFE_SETUP:
                        memcpy(&driver_setup, &driver_safe_setup,
                                sizeof(driver_setup));
                        break;
                case OPT_EXCLUDE:
                        if (xi < SCSI_NCR_MAX_EXCLUDES)
                                driver_setup.excludes[xi++] = val;
                        break;
                case OPT_HOST_ID:
                        driver_setup.host_id = val;
                        break;
#ifdef SCSI_NCR_IARB_SUPPORT
                case OPT_IARB:
                        driver_setup.iarb = val;
                        break;
#endif
                default:
                        printk("sym53c8xx_setup: unexpected boot option '%.*s' ignored\n", (int)(pc-cur+1), cur);
                        break;
                }

                if ((cur = strchr(cur, ARG_SEP)) != NULL)
                        ++cur;
        }
#endif /* SCSI_NCR_BOOT_COMMAND_LINE_SUPPORT */
        return 1;
}

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,3,13)
#ifndef MODULE
__setup("sym53c8xx=", sym53c8xx_setup);
#endif
#endif

static int 
sym53c8xx_pci_init(Scsi_Host_Template *tpnt, pcidev_t pdev, ncr_device *device);

/*
**   Linux entry point for SYM53C8XX devices detection routine.
**
**   Called by the middle-level scsi drivers at initialization time,
**   or at module installation.
**
**   Read the PCI configuration and try to attach each
**   detected NCR board.
**
**   If NVRAM is present, try to attach boards according to 
**   the used defined boot order.
**
**   Returns the number of boards successfully attached.
*/

static void __init ncr_print_driver_setup(void)
{
#define YesNo(y)        y ? 'y' : 'n'
        printk (NAME53C8XX ": setup=disc:%c,specf:%d,tags:%d,sync:%d,"
                "burst:%d,wide:%c,diff:%d,revprob:%c,buschk:0x%x\n",
                YesNo(driver_setup.disconnection),
                driver_setup.special_features,
                driver_setup.default_tags,
                driver_setup.default_sync,
                driver_setup.burst_max,
                YesNo(driver_setup.max_wide),
                driver_setup.diff_support,
                YesNo(driver_setup.reverse_probe),
                driver_setup.bus_check);

        printk (NAME53C8XX ": setup=mpar:%c,spar:%c,fsn=%c,verb:%d,debug:0x%x,"
                "led:%c,settle:%d,irqm:0x%x,nvram:0x%x,pcifix:0x%x\n",
                YesNo(driver_setup.master_parity),
                YesNo(driver_setup.scsi_parity),
                YesNo(driver_setup.force_sync_nego),
                driver_setup.verbose,
                driver_setup.debug,
                YesNo(driver_setup.led_pin),
                driver_setup.settle_delay,
                driver_setup.irqm,
                driver_setup.use_nvram,
                driver_setup.pci_fix_up);
#undef YesNo
}

/*===================================================================
**   SYM53C8XX devices description table and chip ids list.
**===================================================================
*/

static ncr_chip ncr_chip_table[] __initdata     = SCSI_NCR_CHIP_TABLE;
static ushort   ncr_chip_ids[]   __initdata     = SCSI_NCR_CHIP_IDS;

#ifdef  SCSI_NCR_PQS_PDS_SUPPORT
/*===================================================================
**    Detect all NCR PQS/PDS boards and keep track of their bus nr.
**
**    The NCR PQS or PDS card is constructed as a DEC bridge
**    behind which sit a proprietary NCR memory controller and
**    four or two 53c875s as separate devices.  In its usual mode
**    of operation, the 875s are slaved to the memory controller
**    for all transfers.  We can tell if an 875 is part of a
**    PQS/PDS or not since if it is, it will be on the same bus
**    as the memory controller.  To operate with the Linux
**    driver, the memory controller is disabled and the 875s
**    freed to function independently.  The only wrinkle is that
**    the preset SCSI ID (which may be zero) must be read in from
**    a special configuration space register of the 875
**===================================================================
*/
#define SCSI_NCR_MAX_PQS_BUS    16
static int pqs_bus[SCSI_NCR_MAX_PQS_BUS] __initdata = { 0 };

static void __init ncr_detect_pqs_pds(void)
{
        short index;
        pcidev_t dev = PCIDEV_NULL;

        for(index=0; index < SCSI_NCR_MAX_PQS_BUS; index++) {
                u_char tmp;

                dev = pci_find_device(0x101a, 0x0009, dev);
                if (dev == PCIDEV_NULL) {
                        pqs_bus[index] = -1;
                        break;
                }
                printk(KERN_INFO NAME53C8XX ": NCR PQS/PDS memory controller detected on bus %d\n", PciBusNumber(dev));
                pci_read_config_byte(dev, 0x44, &tmp);
                /* bit 1: allow individual 875 configuration */
                tmp |= 0x2;
                pci_write_config_byte(dev, 0x44, tmp);
                pci_read_config_byte(dev, 0x45, &tmp);
                /* bit 2: drive individual 875 interrupts to the bus */
                tmp |= 0x4;
                pci_write_config_byte(dev, 0x45, tmp);

                pqs_bus[index] = PciBusNumber(dev);
        }
}
#endif /* SCSI_NCR_PQS_PDS_SUPPORT */

/*===================================================================
**    Detect all 53c8xx hosts and then attach them.
**
**    If we are using NVRAM, once all hosts are detected, we need to 
**    check any NVRAM for boot order in case detect and boot order 
**    differ and attach them using the order in the NVRAM.
**
**    If no NVRAM is found or data appears invalid attach boards in 
**    the order they are detected.
**===================================================================
*/
int __init sym53c8xx_detect(Scsi_Host_Template *tpnt)
{
        pcidev_t pcidev;
        int i, j, chips, hosts, count;
        int attach_count = 0;
        ncr_device *devtbl, *devp;
#ifdef SCSI_NCR_NVRAM_SUPPORT
        ncr_nvram  nvram0, nvram, *nvp;
#endif

        /*
        **    PCI is required.
        */
        if (!pci_present())
                return 0;

        /*
        **    Initialize driver general stuff.
        */
#ifdef SCSI_NCR_PROC_INFO_SUPPORT
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,3,27)
     tpnt->proc_dir  = &proc_scsi_sym53c8xx;
#else
     tpnt->proc_name = NAME53C8XX;
#endif
     tpnt->proc_info = sym53c8xx_proc_info;
#endif

#if     defined(SCSI_NCR_BOOT_COMMAND_LINE_SUPPORT) && defined(MODULE)
if (sym53c8xx)
        sym53c8xx_setup(sym53c8xx);
#endif
#ifdef SCSI_NCR_DEBUG_INFO_SUPPORT
        ncr_debug = driver_setup.debug;
#endif

        if (initverbose >= 2)
                ncr_print_driver_setup();

        /*
        **      Allocate the device table since we donnot want to 
        **      overflow the kernel stack.
        **      1 x 4K PAGE is enough for more than 40 devices for i386.
        */
        devtbl = m_calloc(PAGE_SIZE, "devtbl");
        if (!devtbl)
                return 0;

        /*
        **    Detect all NCR PQS/PDS memory controllers.
        */
#ifdef  SCSI_NCR_PQS_PDS_SUPPORT
        ncr_detect_pqs_pds();
#endif

        /* 
        **    Detect all 53c8xx hosts.
        **    Save the first Symbios NVRAM content if any 
        **    for the boot order.
        */
        chips   = sizeof(ncr_chip_ids)  / sizeof(ncr_chip_ids[0]);
        hosts   = PAGE_SIZE             / sizeof(*devtbl);
#ifdef SCSI_NCR_NVRAM_SUPPORT
        nvp = (driver_setup.use_nvram & 0x1) ? &nvram0 : 0;
#endif
        j = 0;
        count = 0;
        pcidev = PCIDEV_NULL;
        while (1) {
                char *msg = "";
                if (count >= hosts)
                        break;
                if (j >= chips)
                        break;
                i = driver_setup.reverse_probe ? chips - 1 - j : j;
                pcidev = pci_find_device(PCI_VENDOR_ID_NCR, ncr_chip_ids[i],
                                         pcidev);
                if (pcidev == PCIDEV_NULL) {
                        ++j;
                        continue;
                }
                if (pci_enable_device(pcidev)) /* @!*!$&*!%-*#;! */
                        continue;
                /* Some HW as the HP LH4 may report twice PCI devices */
                for (i = 0; i < count ; i++) {
                        if (devtbl[i].slot.bus       == PciBusNumber(pcidev) && 
                            devtbl[i].slot.device_fn == PciDeviceFn(pcidev))
                                break;
                }
                if (i != count) /* Ignore this device if we already have it */
                        continue;
                pci_set_master(pcidev);
                devp = &devtbl[count];
                devp->host_id = driver_setup.host_id;
                devp->attach_done = 0;
                if (sym53c8xx_pci_init(tpnt, pcidev, devp)) {
                        continue;
                }
                ++count;
#ifdef SCSI_NCR_NVRAM_SUPPORT
                if (nvp) {
                        ncr_get_nvram(devp, nvp);
                        switch(nvp->type) {
                        case SCSI_NCR_SYMBIOS_NVRAM:
                                /*
                                 *   Switch to the other nvram buffer, so that 
                                 *   nvram0 will contain the first Symbios 
                                 *   format NVRAM content with boot order.
                                 */
                                nvp = &nvram;
                                msg = "with Symbios NVRAM";
                                break;
                        case SCSI_NCR_TEKRAM_NVRAM:
                                msg = "with Tekram NVRAM";
                                break;
                        }
                }
#endif
#ifdef  SCSI_NCR_PQS_PDS_SUPPORT
                if (devp->pqs_pds)
                        msg = "(NCR PQS/PDS)";
#endif
                printk(KERN_INFO NAME53C8XX ": 53c%s detected %s\n",
                       devp->chip.name, msg);
        }

        /*
        **    If we have found a SYMBIOS NVRAM, use first the NVRAM boot 
        **    sequence as device boot order.
        **    check devices in the boot record against devices detected. 
        **    attach devices if we find a match. boot table records that 
        **    do not match any detected devices will be ignored. 
        **    devices that do not match any boot table will not be attached
        **    here but will attempt to be attached during the device table 
        **    rescan.
        */
#ifdef SCSI_NCR_NVRAM_SUPPORT
        if (!nvp || nvram0.type != SCSI_NCR_SYMBIOS_NVRAM)
                goto next;
        for (i = 0; i < 4; i++) {
                Symbios_host *h = &nvram0.data.Symbios.host[i];
                for (j = 0 ; j < count ; j++) {
                        devp = &devtbl[j];
                        if (h->device_fn != devp->slot.device_fn ||
                            h->bus_nr    != devp->slot.bus       ||
                            h->device_id != devp->chip.device_id)
                                continue;
                        if (devp->attach_done)
                                continue;
                        if (h->flags & SYMBIOS_INIT_SCAN_AT_BOOT) {
                                ncr_get_nvram(devp, nvp);
                                if (!ncr_attach (tpnt, attach_count, devp))
                                        attach_count++;
                        }
                        else if (!(driver_setup.use_nvram & 0x80))
                                printk(KERN_INFO NAME53C8XX
                                       ": 53c%s state OFF thus not attached\n",
                                       devp->chip.name);
                        else
                                continue;

                        devp->attach_done = 1;
                        break;
                }
        }
next:
#endif

        /* 
        **    Rescan device list to make sure all boards attached.
        **    Devices without boot records will not be attached yet
        **    so try to attach them here.
        */
        for (i= 0; i < count; i++) {
                devp = &devtbl[i];
                if (!devp->attach_done) {
#ifdef SCSI_NCR_NVRAM_SUPPORT
                        ncr_get_nvram(devp, nvp);
#endif
                        if (!ncr_attach (tpnt, attach_count, devp))
                                attach_count++;
                }
        }

        m_free(devtbl, PAGE_SIZE, "devtbl");

        return attach_count;
}

/*===================================================================
**   Read and check the PCI configuration for any detected NCR 
**   boards and save data for attaching after all boards have 
**   been detected.
**===================================================================
*/
static int __init
sym53c8xx_pci_init(Scsi_Host_Template *tpnt, pcidev_t pdev, ncr_device *device)
{
        u_short vendor_id, device_id, command, status_reg;
        u_char cache_line_size, latency_timer;
        u_char suggested_cache_line_size = 0;
        u_char pci_fix_up = driver_setup.pci_fix_up;
        u_char revision;
        u_int irq;
        u_long base, base_c, base_2, base_2_c, io_port; 
        int i;
        ncr_chip *chip;

        printk(KERN_INFO NAME53C8XX ": at PCI bus %d, device %d, function %d\n",
                PciBusNumber(pdev),
                (int) (PciDeviceFn(pdev) & 0xf8) >> 3,
                (int) (PciDeviceFn(pdev) & 7));

        /*
        **    Read info from the PCI config space.
        **    pci_read_config_xxx() functions are assumed to be used for 
        **    successfully detected PCI devices.
        */
        vendor_id = PciVendorId(pdev);
        device_id = PciDeviceId(pdev);
        irq       = PciIrqLine(pdev);

        i = pci_get_base_address(pdev, 0, &io_port);
        io_port = pci_get_base_cookie(pdev, 0);

        base_c = pci_get_base_cookie(pdev, i);
        i = pci_get_base_address(pdev, i, &base);

        base_2_c = pci_get_base_cookie(pdev, i);
        (void) pci_get_base_address(pdev, i, &base_2);

        pci_read_config_word(pdev, PCI_COMMAND,         &command);
        pci_read_config_byte(pdev, PCI_CLASS_REVISION,  &revision);
        pci_read_config_byte(pdev, PCI_CACHE_LINE_SIZE, &cache_line_size);
        pci_read_config_byte(pdev, PCI_LATENCY_TIMER,   &latency_timer);
        pci_read_config_word(pdev, PCI_STATUS,          &status_reg);

#ifdef SCSI_NCR_PQS_PDS_SUPPORT
        /*
        **    Match the BUS number for PQS/PDS devices.
        **    Read the SCSI ID from a special register mapped
        **    into the configuration space of the individual
        **    875s.  This register is set up by the PQS bios
        */
        for(i = 0; i < SCSI_NCR_MAX_PQS_BUS && pqs_bus[i] != -1; i++) {
                u_char tmp;
                if (pqs_bus[i] == PciBusNumber(pdev)) {
                        pci_read_config_byte(pdev, 0x84, &tmp);
                        device->pqs_pds = 1;
                        device->host_id = tmp;
                        break;
                }
        }
#endif /* SCSI_NCR_PQS_PDS_SUPPORT */

        /*
        **      If user excludes this chip, donnot initialize it.
        */
        for (i = 0 ; i < SCSI_NCR_MAX_EXCLUDES ; i++) {
                if (driver_setup.excludes[i] ==
                                (io_port & PCI_BASE_ADDRESS_IO_MASK))
                        return -1;
        }
        /*
        **    Check if the chip is supported
        */
        chip = 0;
        for (i = 0; i < sizeof(ncr_chip_table)/sizeof(ncr_chip_table[0]); i++) {
                if (device_id != ncr_chip_table[i].device_id)
                        continue;
                if (revision > ncr_chip_table[i].revision_id)
                        continue;
                if (!(ncr_chip_table[i].features & FE_LDSTR))
                        break;
                chip = &device->chip;
                memcpy(chip, &ncr_chip_table[i], sizeof(*chip));
                chip->revision_id = revision;
                break;
        }

#ifdef SCSI_NCR_DYNAMIC_DMA_MAPPING
        /* Configure DMA attributes.  For DAC capable boards, we can encode
        ** 32+8 bits for SCSI DMA data addresses with the extra bits used
        ** in the size field.  We use normal 32-bit PCI addresses for
        ** descriptors.
        */
        if (chip && (chip->features & FE_DAC)) {
                if (pci_set_dma_mask(pdev, (u64) 0xffffffffff))
                        chip->features &= ~FE_DAC_IN_USE;
                else
                        chip->features |= FE_DAC_IN_USE;
        }

        if (chip && !(chip->features & FE_DAC_IN_USE)) {
                if (pci_set_dma_mask(pdev, (u64) 0xffffffff)) {
                        printk(KERN_WARNING NAME53C8XX
                               "32 BIT PCI BUS DMA ADDRESSING NOT SUPPORTED\n");
                        return -1;
                }
        }
#endif

        /*
        **      Ignore Symbios chips controlled by SISL RAID controller.
        **      This controller sets value 0x52414944 at RAM end - 16.
        */
#if defined(__i386__) && !defined(SCSI_NCR_PCI_MEM_NOT_SUPPORTED)
        if (chip && (base_2_c & PCI_BASE_ADDRESS_MEM_MASK)) {
                unsigned int ram_size, ram_val;
                u_long ram_ptr;

                if (chip->features & FE_RAM8K)
                        ram_size = 8192;
                else
                        ram_size = 4096;

                ram_ptr = remap_pci_mem(base_2_c & PCI_BASE_ADDRESS_MEM_MASK,
                                        ram_size);
                if (ram_ptr) {
                        ram_val = readl_raw(ram_ptr + ram_size - 16);
                        unmap_pci_mem(ram_ptr, ram_size);
                        if (ram_val == 0x52414944) {
                                printk(NAME53C8XX": not initializing, "
                                       "driven by SISL RAID controller.\n");
                                return -1;
                        }
                }
        }
#endif /* i386 and PCI MEMORY accessible */

        if (!chip) {
                printk(NAME53C8XX ": not initializing, device not supported\n");
                return -1;
        }

#if defined(__powerpc__) || defined(__hppa__)
        /*
        **      Fix-up for power/pc and hppa.
        **      Should not be performed by the driver.
        */
        if ((command & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY))
                    != (PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) {
                printk(NAME53C8XX ": setting%s%s...\n",
                (command & PCI_COMMAND_IO)     ? "" : " PCI_COMMAND_IO",
                (command & PCI_COMMAND_MEMORY) ? "" : " PCI_COMMAND_MEMORY");
                command |= (PCI_COMMAND_IO | PCI_COMMAND_MEMORY);
                pci_write_config_word(pdev, PCI_COMMAND, command);
        }

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,2,0)
        if ( is_prep ) {
                if (io_port >= 0x10000000) {
                        printk(NAME53C8XX ": reallocating io_port (Wacky IBM)");
                        io_port = (io_port & 0x00FFFFFF) | 0x01000000;
                        pci_write_config_dword(pdev,
                                               PCI_BASE_ADDRESS_0, io_port);
                }
                if (base >= 0x10000000) {
                        printk(NAME53C8XX ": reallocating base (Wacky IBM)");
                        base = (base & 0x00FFFFFF) | 0x01000000;
                        pci_write_config_dword(pdev,
                                               PCI_BASE_ADDRESS_1, base);
                }
                if (base_2 >= 0x10000000) {
                        printk(NAME53C8XX ": reallocating base2 (Wacky IBM)");
                        base_2 = (base_2 & 0x00FFFFFF) | 0x01000000;
                        pci_write_config_dword(pdev,
                                               PCI_BASE_ADDRESS_2, base_2);
                }
        }
#endif
#endif  /* __powerpc__ */

#if defined(__i386__) && !defined(MODULE)
        if (!cache_line_size) {
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,1,75)
                extern char x86;
                switch(x86) {
#else
                switch(boot_cpu_data.x86) {
#endif
                case 4: suggested_cache_line_size = 4; break;
                case 6:
                case 5: suggested_cache_line_size = 8; break;
                }
        }
#endif  /* __i386__ */

        /*
        **    Check availability of IO space, memory space.
        **    Enable master capability if not yet.
        **
        **    We shouldn't have to care about the IO region when 
        **    we are using MMIO. But calling check_region() from 
        **    both the ncr53c8xx and the sym53c8xx drivers prevents 
        **    from attaching devices from the both drivers.
        **    If you have a better idea, let me know.
        */
/* #ifdef SCSI_NCR_IOMAPPED */
#if 1
        if (!(command & PCI_COMMAND_IO)) { 
                printk(NAME53C8XX ": I/O base address (0x%lx) disabled.\n",
                        (long) io_port);
                io_port = 0;
        }
#endif
        if (!(command & PCI_COMMAND_MEMORY)) {
                printk(NAME53C8XX ": PCI_COMMAND_MEMORY not set.\n");
                base    = 0;
                base_2  = 0;
        }
        io_port &= PCI_BASE_ADDRESS_IO_MASK;
        base    &= PCI_BASE_ADDRESS_MEM_MASK;
        base_2  &= PCI_BASE_ADDRESS_MEM_MASK;

/* #ifdef SCSI_NCR_IOMAPPED */
#if 1
        if (io_port && check_region (io_port, 128)) {
                printk(NAME53C8XX ": IO region 0x%lx[0..127] is in use\n",
                        (long) io_port);
                io_port = 0;
        }
        if (!io_port)
                return -1;
#endif
#ifndef SCSI_NCR_IOMAPPED
        if (!base) {
                printk(NAME53C8XX ": MMIO base address disabled.\n");
                return -1;
        }
#endif

        /*
        **    Set MASTER capable and PARITY bit, if not yet.
        */
        if ((command & (PCI_COMMAND_MASTER | PCI_COMMAND_PARITY))
                     != (PCI_COMMAND_MASTER | PCI_COMMAND_PARITY)) {
                printk(NAME53C8XX ": setting%s%s...(fix-up)\n",
                (command & PCI_COMMAND_MASTER) ? "" : " PCI_COMMAND_MASTER",
                (command & PCI_COMMAND_PARITY) ? "" : " PCI_COMMAND_PARITY");
                command |= (PCI_COMMAND_MASTER | PCI_COMMAND_PARITY);
                pci_write_config_word(pdev, PCI_COMMAND, command);
        }

        /*
        **    Fix some features according to driver setup.
        */
        if (!(driver_setup.special_features & 1))
                chip->features &= ~FE_SPECIAL_SET;
        else {
                if (driver_setup.special_features & 2)
                        chip->features &= ~FE_WRIE;
                if (driver_setup.special_features & 4)
                        chip->features &= ~FE_NOPM;
        }

        /*
        ** Work around for errant bit in 895A. The 66Mhz
        ** capable bit is set erroneously. Clear this bit.
        ** (Item 1 DEL 533)
        **
        ** Make sure Config space and Features agree.
        **
        ** Recall: writes are not normal to status register -
        ** write a 1 to clear and a 0 to leave unchanged.
        ** Can only reset bits.
        */
        if (chip->features & FE_66MHZ) {
                if (!(status_reg & PCI_STATUS_66MHZ))
                        chip->features &= ~FE_66MHZ;
        }
        else {
                if (status_reg & PCI_STATUS_66MHZ) {
                        status_reg = PCI_STATUS_66MHZ;
                        pci_write_config_word(pdev, PCI_STATUS, status_reg);
                        pci_read_config_word(pdev, PCI_STATUS, &status_reg);
                }
        }

        /*
        **      Some features are required to be enabled in order to 
        **      work around some chip problems. :) ;)
        **      (ITEM 12 of a DEL about the 896 I haven't yet).
        **      We must ensure the chip will use WRITE AND INVALIDATE.
        **      The revision number limit is for now arbitrary.
        */
        if (device_id == PCI_DEVICE_ID_NCR_53C896 && revision <= 0x10) {
                chip->features  |= (FE_WRIE | FE_CLSE);
                pci_fix_up      |=  3;  /* Force appropriate PCI fix-up */
        }

#ifdef  SCSI_NCR_PCI_FIX_UP_SUPPORT
        /*
        **    Try to fix up PCI config according to wished features.
        */
        if ((pci_fix_up & 1) && (chip->features & FE_CLSE) && 
            !cache_line_size && suggested_cache_line_size) {
                cache_line_size = suggested_cache_line_size;
                pci_write_config_byte(pdev,
                                      PCI_CACHE_LINE_SIZE, cache_line_size);
                printk(NAME53C8XX ": PCI_CACHE_LINE_SIZE set to %d (fix-up).\n",
                        cache_line_size);
        }

        if ((pci_fix_up & 2) && cache_line_size &&
            (chip->features & FE_WRIE) && !(command & PCI_COMMAND_INVALIDATE)) {
                printk(NAME53C8XX": setting PCI_COMMAND_INVALIDATE (fix-up)\n");
                command |= PCI_COMMAND_INVALIDATE;
                pci_write_config_word(pdev, PCI_COMMAND, command);
        }

        /*
        **    Tune PCI LATENCY TIMER according to burst max length transfer.
        **    (latency timer >= burst length + 6, we add 10 to be quite sure)
        */

        if (chip->burst_max && (latency_timer == 0 || (pci_fix_up & 4))) {
                uchar lt = (1 << chip->burst_max) + 6 + 10;
                if (latency_timer < lt) {
                        printk(NAME53C8XX 
                               ": changing PCI_LATENCY_TIMER from %d to %d.\n",
                               (int) latency_timer, (int) lt);
                        latency_timer = lt;
                        pci_write_config_byte(pdev,
                                              PCI_LATENCY_TIMER, latency_timer);
                }
        }

#endif  /* SCSI_NCR_PCI_FIX_UP_SUPPORT */

        /*
        **    Initialise ncr_device structure with items required by ncr_attach.
        */
        device->pdev            = pdev;
        device->slot.bus        = PciBusNumber(pdev);
        device->slot.device_fn  = PciDeviceFn(pdev);
        device->slot.base       = base;
        device->slot.base_2     = base_2;
        device->slot.base_c     = base_c;
        device->slot.base_2_c   = base_2_c;
        device->slot.io_port    = io_port;
        device->slot.irq        = irq;
        device->attach_done     = 0;

        return 0;
}


/*===================================================================
**    Detect and try to read SYMBIOS and TEKRAM NVRAM.
**
**    Data can be used to order booting of boards.
**
**    Data is saved in ncr_device structure if NVRAM found. This
**    is then used to find drive boot order for ncr_attach().
**
**    NVRAM data is passed to Scsi_Host_Template later during 
**    ncr_attach() for any device set up.
*===================================================================
*/
#ifdef SCSI_NCR_NVRAM_SUPPORT
static void __init ncr_get_nvram(ncr_device *devp, ncr_nvram *nvp)
{
        devp->nvram = nvp;
        if (!nvp)
                return;
        /*
        **    Get access to chip IO registers
        */
#ifdef SCSI_NCR_IOMAPPED
        request_region(devp->slot.io_port, 128, NAME53C8XX);
        devp->slot.base_io = devp->slot.io_port;
#else
        devp->slot.reg = 
                (struct ncr_reg *) remap_pci_mem(devp->slot.base_c, 128);
        if (!devp->slot.reg)
                return;
#endif

        /*
        **    Try to read SYMBIOS nvram.
        **    Try to read TEKRAM nvram if Symbios nvram not found.
        */
        if      (!sym_read_Symbios_nvram(&devp->slot, &nvp->data.Symbios))
                nvp->type = SCSI_NCR_SYMBIOS_NVRAM;
        else if (!sym_read_Tekram_nvram(&devp->slot, devp->chip.device_id,
                                        &nvp->data.Tekram))
                nvp->type = SCSI_NCR_TEKRAM_NVRAM;
        else {
                nvp->type = 0;
                devp->nvram = 0;
        }

        /*
        ** Release access to chip IO registers
        */
#ifdef SCSI_NCR_IOMAPPED
        release_region(devp->slot.base_io, 128);
#else
        unmap_pci_mem((u_long) devp->slot.reg, 128ul);
#endif

}
#endif  /* SCSI_NCR_NVRAM_SUPPORT */

/*
**   Linux select queue depths function
*/

#define DEF_DEPTH       (driver_setup.default_tags)
#define ALL_TARGETS     -2
#define NO_TARGET       -1
#define ALL_LUNS        -2
#define NO_LUN          -1

static int device_queue_depth(ncb_p np, int target, int lun)
{
        int c, h, t, u, v;
        char *p = driver_setup.tag_ctrl;
        char *ep;

        h = -1;
        t = NO_TARGET;
        u = NO_LUN;
        while ((c = *p++) != 0) {
                v = simple_strtoul(p, &ep, 0);
                switch(c) {
                case '/':
                        ++h;
                        t = ALL_TARGETS;
                        u = ALL_LUNS;
                        break;
                case 't':
                        if (t != target)
                                t = (target == v) ? v : NO_TARGET;
                        u = ALL_LUNS;
                        break;
                case 'u':
                        if (u != lun)
                                u = (lun == v) ? v : NO_LUN;
                        break;
                case 'q':
                        if (h == np->unit &&
                                (t == ALL_TARGETS || t == target) &&
                                (u == ALL_LUNS    || u == lun))
                                return v;
                        break;
                case '-':
                        t = ALL_TARGETS;
                        u = ALL_LUNS;
                        break;
                default:
                        break;
                }
                p = ep;
        }
        return DEF_DEPTH;
}

int sym53c8xx_slave_configure(Scsi_Device *device)
{
        struct Scsi_Host *host = device->host;
        ncb_p np;
        tcb_p tp;
        lcb_p lp;
        int numtags, depth_to_use;

        np = ((struct host_data *) host->hostdata)->ncb;
        tp = &np->target[device->id];
        lp = ncr_lp(np, tp, device->lun);

        /*
        **      Select queue depth from driver setup.
        **      Donnot use more than configured by user.
        **      Use at least 2.
        **      Donnot use more than our maximum.
        */
        numtags = device_queue_depth(np, device->id, device->lun);
        if (numtags > tp->usrtags)
                numtags = tp->usrtags;
        if (!device->tagged_supported)
                numtags = 1;
        depth_to_use = numtags;
        if (depth_to_use < 2)
                depth_to_use = 2;
        if (depth_to_use > MAX_TAGS)
                depth_to_use = MAX_TAGS;

        scsi_adjust_queue_depth(device,
                                (device->tagged_supported ?
                                 MSG_SIMPLE_TAG : 0),
                                depth_to_use);

        /*
        **      Since the queue depth is not tunable under Linux,
        **      we need to know this value in order not to 
        **      announce stupid things to user.
        */
        if (lp) {
                lp->numtags = lp->maxtags = numtags;
                lp->scdev_depth = depth_to_use;
        }
        ncr_setup_tags (np, device->id, device->lun);

#ifdef DEBUG_SYM53C8XX
        printk("sym53c8xx_select_queue_depth: host=%d, id=%d, lun=%d, depth=%d\n",
               np->unit, device->id, device->lun, depth_to_use);
#endif

        return 0;
}

/*
**   Linux entry point for info() function
*/
const char *sym53c8xx_info (struct Scsi_Host *host)
{
        return SCSI_NCR_DRIVER_NAME;
}

/*
**   Linux entry point of queuecommand() function
*/

int sym53c8xx_queue_command (Scsi_Cmnd *cmd, void (* done)(Scsi_Cmnd *))
{
     ncb_p np = ((struct host_data *) cmd->device->host->hostdata)->ncb;
     unsigned long flags;
     int sts;

#ifdef DEBUG_SYM53C8XX
printk("sym53c8xx_queue_command\n");
#endif

     cmd->scsi_done     = done;
     cmd->host_scribble = NULL;
     cmd->SCp.ptr       = NULL;
     cmd->SCp.buffer    = NULL;
#ifdef SCSI_NCR_DYNAMIC_DMA_MAPPING
     __data_mapped(cmd) = 0;
     __data_mapping(cmd) = 0;
#endif

     NCR_LOCK_NCB(np, flags);

     if ((sts = ncr_queue_command(np, cmd)) != DID_OK) {
          SetScsiResult(cmd, sts, 0);
#ifdef DEBUG_SYM53C8XX
printk("sym53c8xx : command not queued - result=%d\n", sts);
#endif
     }
#ifdef DEBUG_SYM53C8XX
     else
printk("sym53c8xx : command successfully queued\n");
#endif

     NCR_UNLOCK_NCB(np, flags);

     if (sts != DID_OK) {
          unmap_scsi_data(np, cmd);
          done(cmd);
     }

     return sts;
}

/*
**   Linux entry point of the interrupt handler.
**   Since linux versions > 1.3.70, we trust the kernel for 
**   passing the internal host descriptor as 'dev_id'.
**   Otherwise, we scan the host list and call the interrupt 
**   routine for each host that uses this IRQ.
*/

static void sym53c8xx_intr(int irq, void *dev_id, struct pt_regs * regs)
{
     unsigned long flags;
     ncb_p np = (ncb_p) dev_id;
     Scsi_Cmnd *done_list;

#ifdef DEBUG_SYM53C8XX
     printk("sym53c8xx : interrupt received\n");
#endif

     if (DEBUG_FLAGS & DEBUG_TINY) printk ("[");

     NCR_LOCK_NCB(np, flags);
     ncr_exception(np);
     done_list     = np->done_list;
     np->done_list = 0;
     NCR_UNLOCK_NCB(np, flags);

     if (DEBUG_FLAGS & DEBUG_TINY) printk ("]\n");

     if (done_list) {
          NCR_LOCK_SCSI_DONE(done_list->device->host, flags);
          ncr_flush_done_cmds(done_list);
          NCR_UNLOCK_SCSI_DONE(done_list->device->host, flags);
     }
}

/*
**   Linux entry point of the timer handler
*/

static void sym53c8xx_timeout(unsigned long npref)
{
     ncb_p np = (ncb_p) npref;
     unsigned long flags;
     Scsi_Cmnd *done_list;

     NCR_LOCK_NCB(np, flags);
     ncr_timeout((ncb_p) np);
     done_list     = np->done_list;
     np->done_list = 0;
     NCR_UNLOCK_NCB(np, flags);

     if (done_list) {
          NCR_LOCK_SCSI_DONE(done_list->device->host, flags);
          ncr_flush_done_cmds(done_list);
          NCR_UNLOCK_SCSI_DONE(done_list->device->host, flags);
     }
}

/*
**   Linux entry point of reset() function
*/

#if defined SCSI_RESET_SYNCHRONOUS && defined SCSI_RESET_ASYNCHRONOUS
int sym53c8xx_reset(Scsi_Cmnd *cmd, unsigned int reset_flags)
#else
int sym53c8xx_reset(Scsi_Cmnd *cmd)
#endif
{
        ncb_p np = ((struct host_data *) cmd->device->host->hostdata)->ncb;
        int sts;
        unsigned long flags;
        Scsi_Cmnd *done_list;

#if defined SCSI_RESET_SYNCHRONOUS && defined SCSI_RESET_ASYNCHRONOUS
        printk("sym53c8xx_reset: pid=%lu reset_flags=%x serial_number=%ld serial_number_at_timeout=%ld\n",
                cmd->pid, reset_flags, cmd->serial_number, cmd->serial_number_at_timeout);
#else
        printk("sym53c8xx_reset: command pid %lu\n", cmd->pid);
#endif

        NCR_LOCK_NCB(np, flags);

        /*
         * We have to just ignore reset requests in some situations.
         */
#if defined SCSI_RESET_NOT_RUNNING
        if (cmd->serial_number != cmd->serial_number_at_timeout) {
                sts = SCSI_RESET_NOT_RUNNING;
                goto out;
        }
#endif
        /*
         * If the mid-level driver told us reset is synchronous, it seems 
         * that we must call the done() callback for the involved command, 
         * even if this command was not queued to the low-level driver, 
         * before returning SCSI_RESET_SUCCESS.
         */

#if defined SCSI_RESET_SYNCHRONOUS && defined SCSI_RESET_ASYNCHRONOUS
        sts = ncr_reset_bus(np, cmd,
        (reset_flags & (SCSI_RESET_SYNCHRONOUS | SCSI_RESET_ASYNCHRONOUS)) == SCSI_RESET_SYNCHRONOUS);
#else
        sts = ncr_reset_bus(np, cmd, 0);
#endif

        /*
         * Since we always reset the controller, when we return success, 
         * we add this information to the return code.
         */
#if defined SCSI_RESET_HOST_RESET
        if (sts == SCSI_RESET_SUCCESS)
                sts |= SCSI_RESET_HOST_RESET;
#endif

out:
        done_list     = np->done_list;
        np->done_list = 0;
        NCR_UNLOCK_NCB(np, flags);

        ncr_flush_done_cmds(done_list);

        return sts;
}

/*
**   Linux entry point of abort() function
*/

int sym53c8xx_abort(Scsi_Cmnd *cmd)
{
        ncb_p np = ((struct host_data *) cmd->device->host->hostdata)->ncb;
        int sts;
        unsigned long flags;
        Scsi_Cmnd *done_list;

#if defined SCSI_RESET_SYNCHRONOUS && defined SCSI_RESET_ASYNCHRONOUS
        printk("sym53c8xx_abort: pid=%lu serial_number=%ld serial_number_at_timeout=%ld\n",
                cmd->pid, cmd->serial_number, cmd->serial_number_at_timeout);
#else
        printk("sym53c8xx_abort: command pid %lu\n", cmd->pid);
#endif

        NCR_LOCK_NCB(np, flags);

#if defined SCSI_RESET_SYNCHRONOUS && defined SCSI_RESET_ASYNCHRONOUS
        /*
         * We have to just ignore abort requests in some situations.
         */
        if (cmd->serial_number != cmd->serial_number_at_timeout) {
                sts = SCSI_ABORT_NOT_RUNNING;
                goto out;
        }
#endif

        sts = ncr_abort_command(np, cmd);
out:
        done_list     = np->done_list;
        np->done_list = 0;
        NCR_UNLOCK_NCB(np, flags);

        ncr_flush_done_cmds(done_list);

        return sts;
}


int sym53c8xx_release(struct Scsi_Host *host)
{
#ifdef DEBUG_SYM53C8XX
printk("sym53c8xx : release\n");
#endif
     ncr_detach(((struct host_data *) host->hostdata)->ncb);

     return 1;
}


/*
**      Scsi command waiting list management.
**
**      It may happen that we cannot insert a scsi command into the start queue,
**      in the following circumstances.
**              Too few preallocated ccb(s), 
**              maxtags < cmd_per_lun of the Linux host control block,
**              etc...
**      Such scsi commands are inserted into a waiting list.
**      When a scsi command complete, we try to requeue the commands of the
**      waiting list.
*/

#define next_wcmd host_scribble

static void insert_into_waiting_list(ncb_p np, Scsi_Cmnd *cmd)
{
        Scsi_Cmnd *wcmd;

#ifdef DEBUG_WAITING_LIST
        printk("%s: cmd %lx inserted into waiting list\n", ncr_name(np), (u_long) cmd);
#endif
        cmd->next_wcmd = 0;
        if (!(wcmd = np->waiting_list)) np->waiting_list = cmd;
        else {
                while ((wcmd->next_wcmd) != 0)
                        wcmd = (Scsi_Cmnd *) wcmd->next_wcmd;
                wcmd->next_wcmd = (char *) cmd;
        }
}

static Scsi_Cmnd *retrieve_from_waiting_list(int to_remove, ncb_p np, Scsi_Cmnd *cmd)
{
        Scsi_Cmnd **pcmd = &np->waiting_list;

        while (*pcmd) {
                if (cmd == *pcmd) {
                        if (to_remove) {
                                *pcmd = (Scsi_Cmnd *) cmd->next_wcmd;
                                cmd->next_wcmd = 0;
                        }
#ifdef DEBUG_WAITING_LIST
        printk("%s: cmd %lx retrieved from waiting list\n", ncr_name(np), (u_long) cmd);
#endif
                        return cmd;
                }
                pcmd = (Scsi_Cmnd **) &(*pcmd)->next_wcmd;
        }
        return 0;
}

static void process_waiting_list(ncb_p np, int sts)
{
        Scsi_Cmnd *waiting_list, *wcmd;

        waiting_list = np->waiting_list;
        np->waiting_list = 0;

#ifdef DEBUG_WAITING_LIST
        if (waiting_list) printk("%s: waiting_list=%lx processing sts=%d\n", ncr_name(np), (u_long) waiting_list, sts);
#endif
        while ((wcmd = waiting_list) != 0) {
                waiting_list = (Scsi_Cmnd *) wcmd->next_wcmd;
                wcmd->next_wcmd = 0;
                if (sts == DID_OK) {
#ifdef DEBUG_WAITING_LIST
        printk("%s: cmd %lx trying to requeue\n", ncr_name(np), (u_long) wcmd);
#endif
                        sts = ncr_queue_command(np, wcmd);
                }
                if (sts != DID_OK) {
#ifdef DEBUG_WAITING_LIST
        printk("%s: cmd %lx done forced sts=%d\n", ncr_name(np), (u_long) wcmd, sts);
#endif
                        SetScsiResult(wcmd, sts, 0);
                        ncr_queue_done_cmd(np, wcmd);
                }
        }
}

#undef next_wcmd

#ifdef SCSI_NCR_PROC_INFO_SUPPORT

/*=========================================================================
**      Proc file system stuff
**
**      A read operation returns adapter information.
**      A write operation is a control command.
**      The string is parsed in the driver code and the command is passed 
**      to the ncr_usercmd() function.
**=========================================================================
*/

#ifdef SCSI_NCR_USER_COMMAND_SUPPORT

#define is_digit(c)     ((c) >= '0' && (c) <= '9')
#define digit_to_bin(c) ((c) - '0')
#define is_space(c)     ((c) == ' ' || (c) == '\t')

static int skip_spaces(char *ptr, int len)
{
        int cnt, c;

        for (cnt = len; cnt > 0 && (c = *ptr++) && is_space(c); cnt--);

        return (len - cnt);
}

static int get_int_arg(char *ptr, int len, u_long *pv)
{
        int     cnt, c;
        u_long  v;

        for (v = 0, cnt = len; cnt > 0 && (c = *ptr++) && is_digit(c); cnt--) {
                v = (v * 10) + digit_to_bin(c);
        }

        if (pv)
                *pv = v;

        return (len - cnt);
}

static int is_keyword(char *ptr, int len, char *verb)
{
        int verb_len = strlen(verb);

        if (len >= strlen(verb) && !memcmp(verb, ptr, verb_len))
                return verb_len;
        else
                return 0;

}

#define SKIP_SPACES(min_spaces)                                         \
        if ((arg_len = skip_spaces(ptr, len)) < (min_spaces))           \
                return -EINVAL;                                         \
        ptr += arg_len; len -= arg_len;

#define GET_INT_ARG(v)                                                  \
        if (!(arg_len = get_int_arg(ptr, len, &(v))))                   \
                return -EINVAL;                                         \
        ptr += arg_len; len -= arg_len;


/*
**      Parse a control command
*/

static int ncr_user_command(ncb_p np, char *buffer, int length)
{
        char *ptr       = buffer;
        int len         = length;
        struct usrcmd    *uc = &np->user;
        int             arg_len;
        u_long          target;

        bzero(uc, sizeof(*uc));

        if (len > 0 && ptr[len-1] == '\n')
                --len;

        if      ((arg_len = is_keyword(ptr, len, "setsync")) != 0)
                uc->cmd = UC_SETSYNC;
        else if ((arg_len = is_keyword(ptr, len, "settags")) != 0)
                uc->cmd = UC_SETTAGS;
        else if ((arg_len = is_keyword(ptr, len, "setorder")) != 0)
                uc->cmd = UC_SETORDER;
        else if ((arg_len = is_keyword(ptr, len, "setverbose")) != 0)
                uc->cmd = UC_SETVERBOSE;
        else if ((arg_len = is_keyword(ptr, len, "setwide")) != 0)
                uc->cmd = UC_SETWIDE;
        else if ((arg_len = is_keyword(ptr, len, "setdebug")) != 0)
                uc->cmd = UC_SETDEBUG;
        else if ((arg_len = is_keyword(ptr, len, "setflag")) != 0)
                uc->cmd = UC_SETFLAG;
        else if ((arg_len = is_keyword(ptr, len, "resetdev")) != 0)
                uc->cmd = UC_RESETDEV;
        else if ((arg_len = is_keyword(ptr, len, "cleardev")) != 0)
                uc->cmd = UC_CLEARDEV;
        else
                arg_len = 0;

#ifdef DEBUG_PROC_INFO
printk("ncr_user_command: arg_len=%d, cmd=%ld\n", arg_len, uc->cmd);
#endif

        if (!arg_len)
                return -EINVAL;
        ptr += arg_len; len -= arg_len;

        switch(uc->cmd) {
        case UC_SETSYNC:
        case UC_SETTAGS:
        case UC_SETWIDE:
        case UC_SETFLAG:
        case UC_RESETDEV:
        case UC_CLEARDEV:
                SKIP_SPACES(1);
                if ((arg_len = is_keyword(ptr, len, "all")) != 0) {
                        ptr += arg_len; len -= arg_len;
                        uc->target = ~0;
                } else {
                        GET_INT_ARG(target);
                        uc->target = (1<<target);
#ifdef DEBUG_PROC_INFO
printk("ncr_user_command: target=%ld\n", target);
#endif
                }
                break;
        }

        switch(uc->cmd) {
        case UC_SETVERBOSE:
        case UC_SETSYNC:
        case UC_SETTAGS:
        case UC_SETWIDE:
                SKIP_SPACES(1);
                GET_INT_ARG(uc->data);
#ifdef DEBUG_PROC_INFO
printk("ncr_user_command: data=%ld\n", uc->data);
#endif
                break;
        case UC_SETORDER:
                SKIP_SPACES(1);
                if      ((arg_len = is_keyword(ptr, len, "simple")))
                        uc->data = M_SIMPLE_TAG;
                else if ((arg_len = is_keyword(ptr, len, "ordered")))
                        uc->data = M_ORDERED_TAG;
                else if ((arg_len = is_keyword(ptr, len, "default")))
                        uc->data = 0;
                else
                        return -EINVAL;
                break;
        case UC_SETDEBUG:
                while (len > 0) {
                        SKIP_SPACES(1);
                        if      ((arg_len = is_keyword(ptr, len, "alloc")))
                                uc->data |= DEBUG_ALLOC;
                        else if ((arg_len = is_keyword(ptr, len, "phase")))
                                uc->data |= DEBUG_PHASE;
                        else if ((arg_len = is_keyword(ptr, len, "queue")))
                                uc->data |= DEBUG_QUEUE;
                        else if ((arg_len = is_keyword(ptr, len, "result")))
                                uc->data |= DEBUG_RESULT;
                        else if ((arg_len = is_keyword(ptr, len, "pointer")))
                                uc->data |= DEBUG_POINTER;
                        else if ((arg_len = is_keyword(ptr, len, "script")))
                                uc->data |= DEBUG_SCRIPT;
                        else if ((arg_len = is_keyword(ptr, len, "tiny")))
                                uc->data |= DEBUG_TINY;
                        else if ((arg_len = is_keyword(ptr, len, "timing")))
                                uc->data |= DEBUG_TIMING;
                        else if ((arg_len = is_keyword(ptr, len, "nego")))
                                uc->data |= DEBUG_NEGO;
                        else if ((arg_len = is_keyword(ptr, len, "tags")))
                                uc->data |= DEBUG_TAGS;
                        else
                                return -EINVAL;
                        ptr += arg_len; len -= arg_len;
                }
#ifdef DEBUG_PROC_INFO
printk("ncr_user_command: data=%ld\n", uc->data);
#endif
                break;
        case UC_SETFLAG:
                while (len > 0) {
                        SKIP_SPACES(1);
                        if      ((arg_len = is_keyword(ptr, len, "trace")))
                                uc->data |= UF_TRACE;
                        else if ((arg_len = is_keyword(ptr, len, "no_disc")))
                                uc->data |= UF_NODISC;
                        else
                                return -EINVAL;
                        ptr += arg_len; len -= arg_len;
                }
                break;
        default:
                break;
        }

        if (len)
                return -EINVAL;
        else {
                unsigned long flags;

                NCR_LOCK_NCB(np, flags);
                ncr_usercmd (np);
                NCR_UNLOCK_NCB(np, flags);
        }
        return length;
}

#endif  /* SCSI_NCR_USER_COMMAND_SUPPORT */

#ifdef SCSI_NCR_USER_INFO_SUPPORT

struct info_str
{
        char *buffer;
        int length;
        int offset;
        int pos;
};

static void copy_mem_info(struct info_str *info, char *data, int len)
{
        if (info->pos + len > info->length)
                len = info->length - info->pos;

        if (info->pos + len < info->offset) {
                info->pos += len;
                return;
        }
        if (info->pos < info->offset) {
                data += (info->offset - info->pos);
                len  -= (info->offset - info->pos);
        }

        if (len > 0) {
                memcpy(info->buffer + info->pos, data, len);
                info->pos += len;
        }
}

static int copy_info(struct info_str *info, char *fmt, ...)
{
        va_list args;
        char buf[81];
        int len;

        va_start(args, fmt);
        len = vsprintf(buf, fmt, args);
        va_end(args);

        copy_mem_info(info, buf, len);
        return len;
}

/*
**      Copy formatted information into the input buffer.
*/

static int ncr_host_info(ncb_p np, char *ptr, off_t offset, int len)
{
        struct info_str info;

        info.buffer     = ptr;
        info.length     = len;
        info.offset     = offset;
        info.pos        = 0;

        copy_info(&info, "General information:\n");
        copy_info(&info, "  Chip " NAME53C "%s, device id 0x%x, "
                         "revision id 0x%x\n",
                         np->chip_name, np->device_id,  np->revision_id);
        copy_info(&info, "  On PCI bus %d, device %d, function %d, "
#ifdef __sparc__
                "IRQ %s\n",
#else
                "IRQ %d\n",
#endif
                np->bus, (np->device_fn & 0xf8) >> 3, np->device_fn & 7,
#ifdef __sparc__
                __irq_itoa(np->irq));
#else
                (int) np->irq);
#endif
        copy_info(&info, "  Synchronous period factor %d, "
                         "max commands per lun %d\n",
                         (int) np->minsync, MAX_TAGS);

        if (driver_setup.debug || driver_setup.verbose > 1) {
                copy_info(&info, "  Debug flags 0x%x, verbosity level %d\n",
                          driver_setup.debug, driver_setup.verbose);
        }

        return info.pos > info.offset? info.pos - info.offset : 0;
}

#endif /* SCSI_NCR_USER_INFO_SUPPORT */

/*
**      Entry point of the scsi proc fs of the driver.
**      - func = 0 means read  (returns adapter infos)
**      - func = 1 means write (parse user control command)
*/

static int sym53c8xx_proc_info(char *buffer, char **start, off_t offset,
                        int length, int hostno, int func)
{
        struct Scsi_Host *host;
        struct host_data *host_data;
        ncb_p ncb = 0;
        int retv;

#ifdef DEBUG_PROC_INFO
printk("sym53c8xx_proc_info: hostno=%d, func=%d\n", hostno, func);
#endif

        host = scsi_host_hn_get(hostno);
        if (!host)
                return -EINVAL;

        host_data = (struct host_data *) host->hostdata;
        ncb = host_data->ncb;
        retv = -EINVAL;
        if (!ncb)
                goto out;

        if (func) {
#ifdef  SCSI_NCR_USER_COMMAND_SUPPORT
                retv = ncr_user_command(ncb, buffer, length);
#endif
        } else {
                if (start)
                        *start = buffer;
#ifdef SCSI_NCR_USER_INFO_SUPPORT
                retv = ncr_host_info(ncb, buffer, offset, length);
#endif
        }

out:
        scsi_host_put(host);
        return retv;
}


/*=========================================================================
**      End of proc file system stuff
**=========================================================================
*/
#endif


#ifdef SCSI_NCR_NVRAM_SUPPORT

/*
 *  24C16 EEPROM reading.
 *
 *  GPOI0 - data in/data out
 *  GPIO1 - clock
 *  Symbios NVRAM wiring now also used by Tekram.
 */

#define SET_BIT 0
#define CLR_BIT 1
#define SET_CLK 2
#define CLR_CLK 3

/*
 *  Set/clear data/clock bit in GPIO0
 */
static void __init
S24C16_set_bit(ncr_slot *np, u_char write_bit, u_char *gpreg, int bit_mode)
{
        UDELAY (5);
        switch (bit_mode){
        case SET_BIT:
                *gpreg |= write_bit;
                break;
        case CLR_BIT:
                *gpreg &= 0xfe;
                break;
        case SET_CLK:
                *gpreg |= 0x02;
                break;
        case CLR_CLK:
                *gpreg &= 0xfd;
                break;

        }
        OUTB (nc_gpreg, *gpreg);
        UDELAY (5);
}

/*
 *  Send START condition to NVRAM to wake it up.
 */
static void __init S24C16_start(ncr_slot *np, u_char *gpreg)
{
        S24C16_set_bit(np, 1, gpreg, SET_BIT);
        S24C16_set_bit(np, 0, gpreg, SET_CLK);
        S24C16_set_bit(np, 0, gpreg, CLR_BIT);
        S24C16_set_bit(np, 0, gpreg, CLR_CLK);
}

/*
 *  Send STOP condition to NVRAM - puts NVRAM to sleep... ZZzzzz!!
 */
static void __init S24C16_stop(ncr_slot *np, u_char *gpreg)
{
        S24C16_set_bit(np, 0, gpreg, SET_CLK);
        S24C16_set_bit(np, 1, gpreg, SET_BIT);
}

/*
 *  Read or write a bit to the NVRAM,
 *  read if GPIO0 input else write if GPIO0 output
 */
static void __init 
S24C16_do_bit(ncr_slot *np, u_char *read_bit, u_char write_bit, u_char *gpreg)
{
        S24C16_set_bit(np, write_bit, gpreg, SET_BIT);
        S24C16_set_bit(np, 0, gpreg, SET_CLK);
        if (read_bit)
                *read_bit = INB (nc_gpreg);
        S24C16_set_bit(np, 0, gpreg, CLR_CLK);
        S24C16_set_bit(np, 0, gpreg, CLR_BIT);
}

/*
 *  Output an ACK to the NVRAM after reading,
 *  change GPIO0 to output and when done back to an input
 */
static void __init
S24C16_write_ack(ncr_slot *np, u_char write_bit, u_char *gpreg, u_char *gpcntl)
{
        OUTB (nc_gpcntl, *gpcntl & 0xfe);
        S24C16_do_bit(np, 0, write_bit, gpreg);
        OUTB (nc_gpcntl, *gpcntl);
}

/*
 *  Input an ACK from NVRAM after writing,
 *  change GPIO0 to input and when done back to an output
 */
static void __init 
S24C16_read_ack(ncr_slot *np, u_char *read_bit, u_char *gpreg, u_char *gpcntl)
{
        OUTB (nc_gpcntl, *gpcntl | 0x01);
        S24C16_do_bit(np, read_bit, 1, gpreg);
        OUTB (nc_gpcntl, *gpcntl);
}

/*
 *  WRITE a byte to the NVRAM and then get an ACK to see it was accepted OK,
 *  GPIO0 must already be set as an output
 */
static void __init 
S24C16_write_byte(ncr_slot *np, u_char *ack_data, u_char write_data, 
                  u_char *gpreg, u_char *gpcntl)
{
        int x;
        
        for (x = 0; x < 8; x++)
                S24C16_do_bit(np, 0, (write_data >> (7 - x)) & 0x01, gpreg);
                
        S24C16_read_ack(np, ack_data, gpreg, gpcntl);
}

/*
 *  READ a byte from the NVRAM and then send an ACK to say we have got it,
 *  GPIO0 must already be set as an input
 */
static void __init 
S24C16_read_byte(ncr_slot *np, u_char *read_data, u_char ack_data, 
                 u_char *gpreg, u_char *gpcntl)
{
        int x;
        u_char read_bit;

        *read_data = 0;
        for (x = 0; x < 8; x++) {
                S24C16_do_bit(np, &read_bit, 1, gpreg);
                *read_data |= ((read_bit & 0x01) << (7 - x));
        }

        S24C16_write_ack(np, ack_data, gpreg, gpcntl);
}

/*
 *  Read 'len' bytes starting at 'offset'.
 */
static int __init 
sym_read_S24C16_nvram (ncr_slot *np, int offset, u_char *data, int len)
{
        u_char  gpcntl, gpreg;
        u_char  old_gpcntl, old_gpreg;
        u_char  ack_data;
        int     retv = 1;
        int     x;

        /* save current state of GPCNTL and GPREG */
        old_gpreg       = INB (nc_gpreg);
        old_gpcntl      = INB (nc_gpcntl);
        gpcntl          = old_gpcntl & 0x1c;

        /* set up GPREG & GPCNTL to set GPIO0 and GPIO1 in to known state */
        OUTB (nc_gpreg,  old_gpreg);
        OUTB (nc_gpcntl, gpcntl);

        /* this is to set NVRAM into a known state with GPIO0/1 both low */
        gpreg = old_gpreg;
        S24C16_set_bit(np, 0, &gpreg, CLR_CLK);
        S24C16_set_bit(np, 0, &gpreg, CLR_BIT);
                
        /* now set NVRAM inactive with GPIO0/1 both high */
        S24C16_stop(np, &gpreg);
        
        /* activate NVRAM */
        S24C16_start(np, &gpreg);

        /* write device code and random address MSB */
        S24C16_write_byte(np, &ack_data,
                0xa0 | ((offset >> 7) & 0x0e), &gpreg, &gpcntl);
        if (ack_data & 0x01)
                goto out;

        /* write random address LSB */
        S24C16_write_byte(np, &ack_data,
                offset & 0xff, &gpreg, &gpcntl);
        if (ack_data & 0x01)
                goto out;

        /* regenerate START state to set up for reading */
        S24C16_start(np, &gpreg);
        
        /* rewrite device code and address MSB with read bit set (lsb = 0x01) */
        S24C16_write_byte(np, &ack_data,
                0xa1 | ((offset >> 7) & 0x0e), &gpreg, &gpcntl);
        if (ack_data & 0x01)
                goto out;

        /* now set up GPIO0 for inputting data */
        gpcntl |= 0x01;
        OUTB (nc_gpcntl, gpcntl);
                
        /* input all requested data - only part of total NVRAM */
        for (x = 0; x < len; x++) 
                S24C16_read_byte(np, &data[x], (x == (len-1)), &gpreg, &gpcntl);

        /* finally put NVRAM back in inactive mode */
        gpcntl &= 0xfe;
        OUTB (nc_gpcntl, gpcntl);
        S24C16_stop(np, &gpreg);
        retv = 0;
out:
        /* return GPIO0/1 to original states after having accessed NVRAM */
        OUTB (nc_gpcntl, old_gpcntl);
        OUTB (nc_gpreg,  old_gpreg);

        return retv;
}

#undef SET_BIT
#undef CLR_BIT
#undef SET_CLK
#undef CLR_CLK

/*
 *  Try reading Symbios NVRAM.
 *  Return 0 if OK.
 */
static int __init sym_read_Symbios_nvram (ncr_slot *np, Symbios_nvram *nvram)
{
        static u_char Symbios_trailer[6] = {0xfe, 0xfe, 0, 0, 0, 0};
        u_char *data = (u_char *) nvram;
        int len  = sizeof(*nvram);
        u_short csum;
        int x;

        /* probe the 24c16 and read the SYMBIOS 24c16 area */
        if (sym_read_S24C16_nvram (np, SYMBIOS_NVRAM_ADDRESS, data, len))
                return 1;

        /* check valid NVRAM signature, verify byte count and checksum */
        if (nvram->type != 0 ||
            memcmp(nvram->trailer, Symbios_trailer, 6) ||
            nvram->byte_count != len - 12)
                return 1;

        /* verify checksum */
        for (x = 6, csum = 0; x < len - 6; x++)
                csum += data[x];
        if (csum != nvram->checksum)
                return 1;

        return 0;
}

/*
 *  93C46 EEPROM reading.
 *
 *  GPOI0 - data in
 *  GPIO1 - data out
 *  GPIO2 - clock
 *  GPIO4 - chip select
 *
 *  Used by Tekram.
 */

/*
 *  Pulse clock bit in GPIO0
 */
static void __init T93C46_Clk(ncr_slot *np, u_char *gpreg)
{
        OUTB (nc_gpreg, *gpreg | 0x04);
        UDELAY (2);
        OUTB (nc_gpreg, *gpreg);
}

/* 
 *  Read bit from NVRAM
 */
static void __init T93C46_Read_Bit(ncr_slot *np, u_char *read_bit, u_char *gpreg)
{
        UDELAY (2);
        T93C46_Clk(np, gpreg);
        *read_bit = INB (nc_gpreg);
}

/*
 *  Write bit to GPIO0
 */
static void __init T93C46_Write_Bit(ncr_slot *np, u_char write_bit, u_char *gpreg)
{
        if (write_bit & 0x01)
                *gpreg |= 0x02;
        else
                *gpreg &= 0xfd;
                
        *gpreg |= 0x10;
                
        OUTB (nc_gpreg, *gpreg);
        UDELAY (2);

        T93C46_Clk(np, gpreg);
}

/*
 *  Send STOP condition to NVRAM - puts NVRAM to sleep... ZZZzzz!!
 */
static void __init T93C46_Stop(ncr_slot *np, u_char *gpreg)
{
        *gpreg &= 0xef;
        OUTB (nc_gpreg, *gpreg);
        UDELAY (2);

        T93C46_Clk(np, gpreg);
}

/*
 *  Send read command and address to NVRAM
 */
static void __init 
T93C46_Send_Command(ncr_slot *np, u_short write_data, 
                    u_char *read_bit, u_char *gpreg)
{
        int x;

        /* send 9 bits, start bit (1), command (2), address (6)  */
        for (x = 0; x < 9; x++)
                T93C46_Write_Bit(np, (u_char) (write_data >> (8 - x)), gpreg);

        *read_bit = INB (nc_gpreg);
}

/*
 *  READ 2 bytes from the NVRAM
 */
static void __init 
T93C46_Read_Word(ncr_slot *np, u_short *nvram_data, u_char *gpreg)
{
        int x;
        u_char read_bit;

        *nvram_data = 0;
        for (x = 0; x < 16; x++) {
                T93C46_Read_Bit(np, &read_bit, gpreg);

                if (read_bit & 0x01)
                        *nvram_data |=  (0x01 << (15 - x));
                else
                        *nvram_data &= ~(0x01 << (15 - x));
        }
}

/*
 *  Read Tekram NvRAM data.
 */
static int __init 
T93C46_Read_Data(ncr_slot *np, u_short *data,int len,u_char *gpreg)
{
        u_char  read_bit;
        int     x;

        for (x = 0; x < len; x++)  {

                /* output read command and address */
                T93C46_Send_Command(np, 0x180 | x, &read_bit, gpreg);
                if (read_bit & 0x01)
                        return 1; /* Bad */
                T93C46_Read_Word(np, &data[x], gpreg);
                T93C46_Stop(np, gpreg);
        }

        return 0;
}

/*
 *  Try reading 93C46 Tekram NVRAM.
 */
static int __init 
sym_read_T93C46_nvram (ncr_slot *np, Tekram_nvram *nvram)
{
        u_char gpcntl, gpreg;
        u_char old_gpcntl, old_gpreg;
        int retv = 1;

        /* save current state of GPCNTL and GPREG */
        old_gpreg       = INB (nc_gpreg);
        old_gpcntl      = INB (nc_gpcntl);

        /* set up GPREG & GPCNTL to set GPIO0/1/2/4 in to known state, 0 in,
           1/2/4 out */
        gpreg = old_gpreg & 0xe9;
        OUTB (nc_gpreg, gpreg);
        gpcntl = (old_gpcntl & 0xe9) | 0x09;
        OUTB (nc_gpcntl, gpcntl);

        /* input all of NVRAM, 64 words */
        retv = T93C46_Read_Data(np, (u_short *) nvram,
                                sizeof(*nvram) / sizeof(short), &gpreg);
        
        /* return GPIO0/1/2/4 to original states after having accessed NVRAM */
        OUTB (nc_gpcntl, old_gpcntl);
        OUTB (nc_gpreg,  old_gpreg);

        return retv;
}

/*
 *  Try reading Tekram NVRAM.
 *  Return 0 if OK.
 */
static int __init 
sym_read_Tekram_nvram (ncr_slot *np, u_short device_id, Tekram_nvram *nvram)
{
        u_char *data = (u_char *) nvram;
        int len = sizeof(*nvram);
        u_short csum;
        int x;

        switch (device_id) {
        case PCI_DEVICE_ID_NCR_53C885:
        case PCI_DEVICE_ID_NCR_53C895:
        case PCI_DEVICE_ID_NCR_53C896:
                x = sym_read_S24C16_nvram(np, TEKRAM_24C16_NVRAM_ADDRESS,
                                          data, len);
                break;
        case PCI_DEVICE_ID_NCR_53C875:
                x = sym_read_S24C16_nvram(np, TEKRAM_24C16_NVRAM_ADDRESS,
                                          data, len);
                if (!x)
                        break;
        default:
                x = sym_read_T93C46_nvram(np, nvram);
                break;
        }
        if (x)
                return 1;

        /* verify checksum */
        for (x = 0, csum = 0; x < len - 1; x += 2)
                csum += data[x] + (data[x+1] << 8);
        if (csum != 0x1234)
                return 1;

        return 0;
}

#endif  /* SCSI_NCR_NVRAM_SUPPORT */

/*
**      Module stuff
*/

MODULE_LICENSE("GPL");

static Scsi_Host_Template driver_template = {
        .name           = "sym53c8xx",
        .detect         = sym53c8xx_detect,
        .release        = sym53c8xx_release,
        .info           = sym53c8xx_info, 
        .queuecommand   = sym53c8xx_queue_command,
        .slave_configure = sym53c8xx_slave_configure,
        .abort          = sym53c8xx_abort,
        .reset          = sym53c8xx_reset,
        .can_queue      = SCSI_NCR_CAN_QUEUE,
        .this_id        = 7,
        .sg_tablesize   = SCSI_NCR_SG_TABLESIZE,
        .cmd_per_lun    = SCSI_NCR_CMD_PER_LUN,
        .max_sectors    = MAX_HW_SEGMENTS*8,
        .use_clustering = DISABLE_CLUSTERING,
        .highmem_io     = 1
};
#include "scsi_module.c"