Initial import

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diff --git a/drivers/scsi/ncr53c8xx.c b/drivers/scsi/ncr53c8xx.c
new file mode 100644
index 000000000..5b93ed810
--- /dev/null
+++ b/drivers/scsi/ncr53c8xx.c
@@ -0,0 +1,8626 @@
+/******************************************************************************
+**  Device driver for the PCI-SCSI NCR538XX controller family.
+**
+**  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.
+**
+**-----------------------------------------------------------------------------
+**
+**  This driver has been ported to Linux from the FreeBSD NCR53C8XX driver
+**  and is currently maintained 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>
+**
+**  And has been ported to NetBSD by
+**          Charles M. Hannum           <mycroft@gnu.ai.mit.edu>
+**
+**-----------------------------------------------------------------------------
+**
+**                     Brief history
+**
+**  December 10 1995 by Gerard Roudier:
+**     Initial port to Linux.
+**
+**  June 23 1996 by Gerard Roudier:
+**     Support for 64 bits architectures (Alpha).
+**
+**  November 30 1996 by Gerard Roudier:
+**     Support for Fast-20 scsi.
+**     Support for large DMA fifo and 128 dwords bursting.
+**
+**  February 27 1997 by Gerard Roudier:
+**     Support for Fast-40 scsi.
+**     Support for on-Board RAM.
+**
+**  May 3 1997 by Gerard Roudier:
+**     Full support for scsi scripts instructions pre-fetching.
+**
+**  May 19 1997 by Richard Waltham <dormouse@farsrobt.demon.co.uk>:
+**     Support for NvRAM detection and reading.
+**
+**  August 18 1997 by Cort <cort@cs.nmt.edu>:
+**     Support for Power/PC (Big Endian).
+**
+**  June 20 1998 by Gerard Roudier
+**     Support for up to 64 tags per lun.
+**     O(1) everywhere (C and SCRIPTS) for normal cases.
+**     Low PCI traffic for command handling when on-chip RAM is present.
+**     Aggressive SCSI SCRIPTS optimizations.
+**
+**  2005 by Matthew Wilcox and James Bottomley
+**     PCI-ectomy.  This driver now supports only the 720 chip (see the
+**     NCR_Q720 and zalon drivers for the bus probe logic).
+**
+*******************************************************************************
+*/
+
+/*
+**	Supported SCSI-II features:
+**	    Synchronous negotiation
+**	    Wide negotiation        (depends on the NCR Chip)
+**	    Enable disconnection
+**	    Tagged command queuing
+**	    Parity checking
+**	    Etc...
+**
+**	Supported NCR/SYMBIOS chips:
+**		53C720		(Wide,   Fast SCSI-2, intfly problems)
+*/
+
+/* Name and version of the driver */
+#define SCSI_NCR_DRIVER_NAME	"ncr53c8xx-3.4.3g"
+
+#define SCSI_NCR_DEBUG_FLAGS	(0)
+
+#include <linux/blkdev.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/errno.h>
+#include <linux/gfp.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/signal.h>
+#include <linux/spinlock.h>
+#include <linux/stat.h>
+#include <linux/string.h>
+#include <linux/time.h>
+#include <linux/timer.h>
+#include <linux/types.h>
+
+#include <asm/dma.h>
+#include <asm/io.h>
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_dbg.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_tcq.h>
+#include <scsi/scsi_transport.h>
+#include <scsi/scsi_transport_spi.h>
+
+#include "ncr53c8xx.h"
+
+#define NAME53C8XX		"ncr53c8xx"
+
+/*==========================================================
+**
+**	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_SCATTER  (0x0800)
+#define DEBUG_IC        (0x1000)
+
+/*
+**    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
+
+static inline struct list_head *ncr_list_pop(struct list_head *head)
+{
+	if (!list_empty(head)) {
+		struct list_head *elem = head->next;
+
+		list_del(elem);
+		return elem;
+	}
+
+	return NULL;
+}
+
+/*==========================================================
+**
+**	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 abstraction, btw).
+**
+**==========================================================
+*/
+
+#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 struct device *m_bush_t;	/* Something that addresses DMAable */
+
+typedef struct m_link {		/* Link between free memory chunks */
+	struct m_link *next;
+} m_link_s;
+
+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)
+
+typedef struct m_pool {		/* Memory pool of a given kind */
+	m_bush_t bush;
+	m_addr_t (*getp)(struct m_pool *);
+	void (*freep)(struct m_pool *, m_addr_t);
+	int nump;
+	m_vtob_s *(vtob[VTOB_HASH_SIZE]);
+	struct m_pool *next;
+	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 NULL;
+
+	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 *)mp->getp(mp);
+			if (h[j].next)
+				h[j].next->next = NULL;
+			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 = NULL;
+		}
+	}
+#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)) {
+			mp->freep(mp, 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 DEFINE_SPINLOCK(ncr53c8xx_lock);
+
+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)
+		memset(p, 0, 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.
+ */
+
+static m_addr_t ___mp0_getp(m_pool_s *mp)
+{
+	m_addr_t m = __get_free_pages(MEMO_GFP_FLAGS, MEMO_PAGE_ORDER);
+	if (m)
+		++mp->nump;
+	return m;
+}
+
+static void ___mp0_freep(m_pool_s *mp, m_addr_t m)
+{
+	free_pages(m, MEMO_PAGE_ORDER);
+	--mp->nump;
+}
+
+static m_pool_s mp0 = {NULL, ___mp0_getp, ___mp0_freep};
+
+/*
+ * DMAable pools.
+ */
+
+/*
+ * 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) dma_alloc_coherent(mp->bush,
+						PAGE_SIZE<<MEMO_PAGE_ORDER,
+						&daddr, GFP_ATOMIC);
+		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;
+		}
+	}
+	if (vbp)
+		__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;
+		dma_free_coherent(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) {
+		memset(mp, 0, 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 = NULL;
+
+	spin_lock_irqsave(&ncr53c8xx_lock, 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);
+	spin_unlock_irqrestore(&ncr53c8xx_lock, 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;
+
+	spin_lock_irqsave(&ncr53c8xx_lock, flags);
+	mp = ___get_dma_pool(bush);
+	if (mp)
+		__m_free(mp, m, size, name);
+	if (mp && !mp->nump)
+		___del_dma_pool(mp);
+	spin_unlock_irqrestore(&ncr53c8xx_lock, 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 = NULL;
+	m_addr_t a = ((m_addr_t) m) & ~MEMO_CLUSTER_MASK;
+
+	spin_lock_irqsave(&ncr53c8xx_lock, flags);
+	mp = ___get_dma_pool(bush);
+	if (mp) {
+		vp = mp->vtob[hc];
+		while (vp && (m_addr_t) vp->vaddr != a)
+			vp = vp->next;
+	}
+	spin_unlock_irqrestore(&ncr53c8xx_lock, flags);
+	return vp ? vp->baddr + (((m_addr_t) m) - a) : 0;
+}
+
+#define _m_calloc_dma(np, s, n)		__m_calloc_dma(np->dev, s, n)
+#define _m_free_dma(np, p, s, n)	__m_free_dma(np->dev, 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->dev, p)
+#define vtobus(p)			_vtobus(np, p)
+
+/*
+ *  Deal with DMA mapping/unmapping.
+ */
+
+/* To keep track of the dma mapping (sg/single) that has been set */
+#define __data_mapped	SCp.phase
+#define __data_mapping	SCp.have_data_in
+
+static void __unmap_scsi_data(struct device *dev, struct scsi_cmnd *cmd)
+{
+	switch(cmd->__data_mapped) {
+	case 2:
+		scsi_dma_unmap(cmd);
+		break;
+	}
+	cmd->__data_mapped = 0;
+}
+
+static int __map_scsi_sg_data(struct device *dev, struct scsi_cmnd *cmd)
+{
+	int use_sg;
+
+	use_sg = scsi_dma_map(cmd);
+	if (!use_sg)
+		return 0;
+
+	cmd->__data_mapped = 2;
+	cmd->__data_mapping = use_sg;
+
+	return use_sg;
+}
+
+#define unmap_scsi_data(np, cmd)	__unmap_scsi_data(np->dev, cmd)
+#define map_scsi_sg_data(np, cmd)	__map_scsi_sg_data(np->dev, cmd)
+
+/*==========================================================
+**
+**	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;
+
+#ifndef MODULE
+#ifdef	SCSI_NCR_BOOT_COMMAND_LINE_SUPPORT
+static struct ncr_driver_setup
+	driver_safe_setup __initdata	= SCSI_NCR_DRIVER_SAFE_SETUP;
+#endif
+#endif /* !MODULE */
+
+#define initverbose (driver_setup.verbose)
+#define bootverbose (np->verbose)
+
+
+/*===================================================================
+**
+**	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_UNUSED_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
+
+#ifdef MODULE
+#define	ARG_SEP	' '
+#else
+#define	ARG_SEP	','
+#endif
+
+#ifndef MODULE
+static char setup_token[] __initdata = 
+	"tags:"   "mpar:"
+	"spar:"   "disc:"
+	"specf:"  "ultra:"
+	"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 ';' */
+
+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;
+}
+
+static int __init sym53c8xx__setup(char *str)
+{
+#ifdef SCSI_NCR_BOOT_COMMAND_LINE_SUPPORT
+	char *cur = str;
+	char *pc, *pv;
+	int i, val, 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;
+}
+#endif /* !MODULE */
+
+/*===================================================================
+**
+**	Get device queue depth from boot command line.
+**
+**===================================================================
+*/
+#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(int unit, 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 == 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;
+}
+
+
+/*==========================================================
+**
+**	The CCB done queue uses an array of CCB virtual 
+**	addresses. Empty entries are flagged using the bogus 
+**	virtual address 0xffffffff.
+**
+**	Since PCI ensures that only aligned DWORDs are accessed 
+**	atomically, 64 bit little-endian architecture requires 
+**	to test the high order DWORD of the entry to determine 
+**	if it is empty or valid.
+**
+**	BTW, I will make things differently as soon as I will 
+**	have a better idea, but this is simple and should work.
+**
+**==========================================================
+*/
+ 
+#define SCSI_NCR_CCB_DONE_SUPPORT
+#ifdef  SCSI_NCR_CCB_DONE_SUPPORT
+
+#define MAX_DONE 24
+#define CCB_DONE_EMPTY 0xffffffffUL
+
+/* All 32 bit architectures */
+#if BITS_PER_LONG == 32
+#define CCB_DONE_VALID(cp)  (((u_long) cp) != CCB_DONE_EMPTY)
+
+/* All > 32 bit (64 bit) architectures regardless endian-ness */
+#else
+#define CCB_DONE_VALID(cp)  \
+	((((u_long) cp) & 0xffffffff00000000ul) && 	\
+	 (((u_long) cp) & 0xfffffffful) != CCB_DONE_EMPTY)
+#endif
+
+#endif /* SCSI_NCR_CCB_DONE_SUPPORT */
+
+/*==========================================================
+**
+**	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 disk devices that support tags.
+*/
+
+#ifndef SCSI_NCR_MAX_TAGS
+#define SCSI_NCR_MAX_TAGS    (8)
+#endif
+
+/*
+**    TAGS are actually limited to 64 tags/lun.
+**    We need to deal with power of 2, for alignment constraints.
+*/
+#if	SCSI_NCR_MAX_TAGS > 64
+#define	MAX_TAGS (64)
+#else
+#define	MAX_TAGS SCSI_NCR_MAX_TAGS
+#endif
+
+#define NO_TAG	(255)
+
+/*
+**	Choose appropriate type for tag bitmap.
+*/
+#if	MAX_TAGS > 32
+typedef u64 tagmap_t;
+#else
+typedef u32 tagmap_t;
+#endif
+
+/*
+**    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    SCSI_NCR_MAX_LUN
+#else
+#define MAX_LUN    (1)
+#endif
+
+/*
+**    Asynchronous pre-scaler (ns). Shall be 40
+*/
+ 
+#ifndef SCSI_NCR_MIN_ASYNC
+#define SCSI_NCR_MIN_ASYNC (40)
+#endif
+
+/*
+**    The maximum number of jobs scheduled for starting.
+**    There should be one slot per target, and one slot
+**    for each tag of each target in use.
+**    The calculation below is actually quite silly ...
+*/
+
+#ifdef SCSI_NCR_CAN_QUEUE
+#define MAX_START   (SCSI_NCR_CAN_QUEUE + 4)
+#else
+#define MAX_START   (MAX_TARGET + 7 * MAX_TAGS)
+#endif
+
+/*
+**   We limit the max number of pending IO to 250.
+**   since we donnot want to allocate more than 1 
+**   PAGE for 'scripth'.
+*/
+#if	MAX_START > 250
+#undef	MAX_START
+#define	MAX_START 250
+#endif
+
+/*
+**    The maximum number of segments a transfer is split into.
+**    We support up to 127 segments for both read and write.
+**    The data scripts are broken into 2 sub-scripts.
+**    80 (MAX_SCATTERL) segments are moved from a sub-script
+**    in on-chip RAM. This makes data transfers shorter than 
+**    80k (assuming 1k fs) as fast as possible.
+*/
+
+#define MAX_SCATTER (SCSI_NCR_MAX_SCATTER)
+
+#if (MAX_SCATTER > 80)
+#define MAX_SCATTERL	80
+#define	MAX_SCATTERH	(MAX_SCATTER - MAX_SCATTERL)
+#else
+#define MAX_SCATTERL	(MAX_SCATTER-1)
+#define	MAX_SCATTERH	1
+#endif
+
+/*
+**	other
+*/
+
+#define NCR_SNOOP_TIMEOUT (1000000)
+
+/*
+**	Other definitions
+*/
+
+#define ScsiResult(host_code, scsi_code) (((host_code) << 16) + ((scsi_code) & 0x7f))
+
+#define initverbose (driver_setup.verbose)
+#define bootverbose (np->verbose)
+
+/*==========================================================
+**
+**	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  */
+
+/*
+**	Invalid host status values used by the SCRIPTS processor 
+**	when the nexus is not fully identified.
+**	Shall never appear in a CCB.
+*/
+
+#define HS_INVALMASK	(0x40)
+#define	HS_SELECTING	(0|HS_INVALMASK)
+#define	HS_IN_RESELECT	(1|HS_INVALMASK)
+#define	HS_STARTING	(2|HS_INVALMASK)
+
+/*
+**	Flags set by the SCRIPT processor for commands 
+**	that have been skipped.
+*/
+#define HS_SKIPMASK	(0x20)
+
+/*==========================================================
+**
+**	Software Interrupt Codes
+**
+**==========================================================
+*/
+
+#define	SIR_BAD_STATUS		(1)
+#define	SIR_XXXXXXXXXX		(2)
+#define	SIR_NEGO_SYNC		(3)
+#define	SIR_NEGO_WIDE		(4)
+#define	SIR_NEGO_FAILED		(5)
+#define	SIR_NEGO_PROTO		(6)
+#define	SIR_REJECT_RECEIVED	(7)
+#define	SIR_REJECT_SENT		(8)
+#define	SIR_IGN_RESIDUE		(9)
+#define	SIR_MISSING_SAVE	(10)
+#define	SIR_RESEL_NO_MSG_IN	(11)
+#define	SIR_RESEL_NO_IDENTIFY	(12)
+#define	SIR_RESEL_BAD_LUN	(13)
+#define	SIR_RESEL_BAD_TARGET	(14)
+#define	SIR_RESEL_BAD_I_T_L	(15)
+#define	SIR_RESEL_BAD_I_T_L_Q	(16)
+#define	SIR_DONE_OVERFLOW	(17)
+#define	SIR_INTFLY		(18)
+#define	SIR_MAX			(18)
+
+/*==========================================================
+**
+**	Extended error codes.
+**	xerr_status field of struct ccb.
+**
+**==========================================================
+*/
+
+#define	XE_OK		(0)
+#define	XE_EXTRA_DATA	(1)	/* unexpected data phase */
+#define	XE_BAD_PHASE	(2)	/* illegal phase (4/5)   */
+
+/*==========================================================
+**
+**	Negotiation status.
+**	nego_status field	of struct ccb.
+**
+**==========================================================
+*/
+
+#define NS_NOCHANGE	(0)
+#define NS_SYNC		(1)
+#define NS_WIDE		(2)
+#define NS_PPR		(4)
+
+/*==========================================================
+**
+**	Misc.
+**
+**==========================================================
+*/
+
+#define CCB_MAGIC	(0xf2691ad2)
+
+/*==========================================================
+**
+**	Declaration of structs.
+**
+**==========================================================
+*/
+
+static struct scsi_transport_template *ncr53c8xx_transport_template = NULL;
+
+struct tcb;
+struct lcb;
+struct ccb;
+struct ncb;
+struct script;
+
+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	UF_TRACE	(0x01)
+#define	UF_NODISC	(0x02)
+#define	UF_NOSCAN	(0x04)
+
+/*========================================================================
+**
+**	Declaration of structs:		target control block
+**
+**========================================================================
+*/
+struct tcb {
+	/*----------------------------------------------------------------
+	**	During reselection the ncr jumps to this point with SFBR 
+	**	set to the encoded target number with bit 7 set.
+	**	if it's not this target, jump to the next.
+	**
+	**	JUMP  IF (SFBR != #target#), @(next tcb)
+	**----------------------------------------------------------------
+	*/
+	struct link   jump_tcb;
+
+	/*----------------------------------------------------------------
+	**	Load the actual values for the sxfer and the scntl3
+	**	register (sync/wide mode).
+	**
+	**	SCR_COPY (1), @(sval field of this tcb), @(sxfer  register)
+	**	SCR_COPY (1), @(wval field of this tcb), @(scntl3 register)
+	**----------------------------------------------------------------
+	*/
+	ncrcmd	getscr[6];
+
+	/*----------------------------------------------------------------
+	**	Get the IDENTIFY message and load the LUN to SFBR.
+	**
+	**	CALL, <RESEL_LUN>
+	**----------------------------------------------------------------
+	*/
+	struct link   call_lun;
+
+	/*----------------------------------------------------------------
+	**	Now look for the right lun.
+	**
+	**	For i = 0 to 3
+	**		SCR_JUMP ^ IFTRUE(MASK(i, 3)), @(first lcb mod. i)
+	**
+	**	Recent chips will prefetch the 4 JUMPS using only 1 burst.
+	**	It is kind of hashcoding.
+	**----------------------------------------------------------------
+	*/
+	struct link     jump_lcb[4];	/* JUMPs for reselection	*/
+	struct lcb *	lp[MAX_LUN];	/* The lcb's of this tcb	*/
+
+	/*----------------------------------------------------------------
+	**	Pointer to the ccb used for negotiation.
+	**	Prevent from starting a negotiation for all queued commands 
+	**	when tagged command queuing is enabled.
+	**----------------------------------------------------------------
+	*/
+	struct ccb *   nego_cp;
+
+	/*----------------------------------------------------------------
+	**	statistical data
+	**----------------------------------------------------------------
+	*/
+	u_long	transfers;
+	u_long	bytes;
+
+	/*----------------------------------------------------------------
+	**	negotiation of wide and synch transfer and device quirks.
+	**----------------------------------------------------------------
+	*/
+#ifdef SCSI_NCR_BIG_ENDIAN
+/*0*/	u16	period;
+/*2*/	u_char	sval;
+/*3*/	u_char	minsync;
+/*0*/	u_char	wval;
+/*1*/	u_char	widedone;
+/*2*/	u_char	quirks;
+/*3*/	u_char	maxoffs;
+#else
+/*0*/	u_char	minsync;
+/*1*/	u_char	sval;
+/*2*/	u16	period;
+/*0*/	u_char	maxoffs;
+/*1*/	u_char	quirks;
+/*2*/	u_char	widedone;
+/*3*/	u_char	wval;
+#endif
+
+	/* User settable limits and options.  */
+	u_char	usrsync;
+	u_char	usrwide;
+	u_char	usrtags;
+	u_char	usrflag;
+	struct scsi_target *starget;
+};
+
+/*========================================================================
+**
+**	Declaration of structs:		lun control block
+**
+**========================================================================
+*/
+struct lcb {
+	/*----------------------------------------------------------------
+	**	During reselection the ncr jumps to this point
+	**	with SFBR set to the "Identify" message.
+	**	if it's not this lun, jump to the next.
+	**
+	**	JUMP  IF (SFBR != #lun#), @(next lcb of this target)
+	**
+	**	It is this lun. Load TEMP with the nexus jumps table 
+	**	address and jump to RESEL_TAG (or RESEL_NOTAG).
+	**
+	**		SCR_COPY (4), p_jump_ccb, TEMP,
+	**		SCR_JUMP, <RESEL_TAG>
+	**----------------------------------------------------------------
+	*/
+	struct link	jump_lcb;
+	ncrcmd		load_jump_ccb[3];
+	struct link	jump_tag;
+	ncrcmd		p_jump_ccb;	/* Jump table bus address	*/
+
+	/*----------------------------------------------------------------
+	**	Jump table used by the script processor to directly jump 
+	**	to the CCB corresponding to the reselected nexus.
+	**	Address is allocated on 256 bytes boundary in order to 
+	**	allow 8 bit calculation of the tag jump entry for up to 
+	**	64 possible tags.
+	**----------------------------------------------------------------
+	*/
+	u32		jump_ccb_0;	/* Default table if no tags	*/
+	u32		*jump_ccb;	/* Virtual address		*/
+
+	/*----------------------------------------------------------------
+	**	CCB queue management.
+	**----------------------------------------------------------------
+	*/
+	struct list_head free_ccbq;	/* Queue of available CCBs	*/
+	struct list_head busy_ccbq;	/* Queue of busy CCBs		*/
+	struct list_head wait_ccbq;	/* Queue of waiting for IO CCBs	*/
+	struct list_head skip_ccbq;	/* Queue of skipped CCBs	*/
+	u_char		actccbs;	/* Number of allocated CCBs	*/
+	u_char		busyccbs;	/* CCBs busy for this lun	*/
+	u_char		queuedccbs;	/* CCBs queued to the controller*/
+	u_char		queuedepth;	/* Queue depth for this lun	*/
+	u_char		scdev_depth;	/* SCSI device queue depth	*/
+	u_char		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_char		ia_tag;		/* Allocation index		*/
+	u_char		if_tag;		/* Freeing index		*/
+	u_char cb_tags[MAX_TAGS];	/* Circular tags buffer	*/
+	u_char		usetags;	/* Command queuing is active	*/
+	u_char		maxtags;	/* Max nr of tags asked by user	*/
+	u_char		numtags;	/* Current number of tags	*/
+
+	/*----------------------------------------------------------------
+	**	QUEUE FULL control and ORDERED tag control.
+	**----------------------------------------------------------------
+	*/
+	/*----------------------------------------------------------------
+	**	QUEUE FULL and ORDERED tag control.
+	**----------------------------------------------------------------
+	*/
+	u16		num_good;	/* Nr of GOOD since QUEUE FULL	*/
+	tagmap_t	tags_umap;	/* Used tags bitmap		*/
+	tagmap_t	tags_smap;	/* Tags in use at 'tag_stime'	*/
+	u_long		tags_stime;	/* Last time we set smap=umap	*/
+	struct ccb *	held_ccb;	/* CCB held for QUEUE FULL	*/
+};
+
+/*========================================================================
+**
+**      Declaration of structs:     the launch script.
+**
+**========================================================================
+**
+**	It is part of the CCB and is called by the scripts processor to 
+**	start or restart the data structure (nexus).
+**	This 6 DWORDs mini script makes use of prefetching.
+**
+**------------------------------------------------------------------------
+*/
+struct launch {
+	/*----------------------------------------------------------------
+	**	SCR_COPY(4),	@(p_phys), @(dsa register)
+	**	SCR_JUMP,	@(scheduler_point)
+	**----------------------------------------------------------------
+	*/
+	ncrcmd		setup_dsa[3];	/* Copy 'phys' address to dsa	*/
+	struct link	schedule;	/* Jump to scheduler point	*/
+	ncrcmd		p_phys;		/* 'phys' header bus address	*/
+};
+
+/*========================================================================
+**
+**      Declaration of structs:     global HEADER.
+**
+**========================================================================
+**
+**	This substructure is copied from the ccb to a global address after 
+**	selection (or reselection) and copied back before disconnect.
+**
+**	These fields are accessible to the script processor.
+**
+**------------------------------------------------------------------------
+*/
+
+struct head {
+	/*----------------------------------------------------------------
+	**	Saved data pointer.
+	**	Points to the position in the script responsible for the
+	**	actual transfer transfer of data.
+	**	It's written after reception of a SAVE_DATA_POINTER message.
+	**	The goalpointer points after the last transfer command.
+	**----------------------------------------------------------------
+	*/
+	u32		savep;
+	u32		lastp;
+	u32		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.
+	**----------------------------------------------------------------
+	*/
+	u32		wlastp;
+	u32		wgoalp;
+
+	/*----------------------------------------------------------------
+	**	The virtual address of the ccb containing this header.
+	**----------------------------------------------------------------
+	*/
+	struct ccb *	cp;
+
+	/*----------------------------------------------------------------
+	**	Status fields.
+	**----------------------------------------------------------------
+	*/
+	u_char		scr_st[4];	/* script status		*/
+	u_char		status[4];	/* host status. must be the 	*/
+					/*  last DWORD of the header.	*/
+};
+
+/*
+**	The status bytes are used by the host and the script processor.
+**
+**	The byte corresponding to the host_status must be stored in the 
+**	last DWORD of the CCB header since it is used for command 
+**	completion (ncr_wakeup()). Doing so, we are sure that the header 
+**	has been entirely copied back to the CCB when the host_status is 
+**	seen complete by the CPU.
+**
+**	The last 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.
+**
+**	The first four bytes (scr_st[4]) are used inside the script by 
+**	"COPY" commands.
+**	Because source and destination must have the same alignment
+**	in a DWORD, the fields HAVE to be at the chosen offsets.
+**		xerr_st		0	(0x34)	scratcha
+**		sync_st		1	(0x05)	sxfer
+**		wide_st		3	(0x03)	scntl3
+*/
+
+/*
+**	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  PS_REG	scr3
+
+/*
+**	Last four bytes (host)
+*/
+#ifdef SCSI_NCR_BIG_ENDIAN
+#define  actualquirks  phys.header.status[3]
+#define  host_status   phys.header.status[2]
+#define  scsi_status   phys.header.status[1]
+#define  parity_status phys.header.status[0]
+#else
+#define  actualquirks  phys.header.status[0]
+#define  host_status   phys.header.status[1]
+#define  scsi_status   phys.header.status[2]
+#define  parity_status phys.header.status[3]
+#endif
+
+/*
+**	First four bytes (script)
+*/
+#define  xerr_st       header.scr_st[0]
+#define  sync_st       header.scr_st[1]
+#define  nego_st       header.scr_st[2]
+#define  wide_st       header.scr_st[3]
+
+/*
+**	First four bytes (host)
+*/
+#define  xerr_status   phys.xerr_st
+#define  nego_status   phys.nego_st
+
+#if 0
+#define  sync_status   phys.sync_st
+#define  wide_status   phys.wide_st
+#endif
+
+/*==========================================================
+**
+**      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-changeable 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 cmd   ;
+	struct scr_tblmove sense ;
+	struct scr_tblmove data[MAX_SCATTER];
+};
+
+
+/*========================================================================
+**
+**      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 because it contains the header 
+	**	as first entry that must be cache line aligned.
+	**----------------------------------------------------------------
+	*/
+	struct dsb	phys;
+
+	/*----------------------------------------------------------------
+	**	Mini-script used at CCB execution start-up.
+	**	Load the DSA with the data structure address (phys) and 
+	**	jump to SELECT. Jump to CANCEL if CCB is to be canceled.
+	**----------------------------------------------------------------
+	*/
+	struct launch	start;
+
+	/*----------------------------------------------------------------
+	**	Mini-script used at CCB relection to restart the nexus.
+	**	Load the DSA with the data structure address (phys) and 
+	**	jump to RESEL_DSA. Jump to ABORT if CCB is to be aborted.
+	**----------------------------------------------------------------
+	*/
+	struct launch	restart;
+
+	/*----------------------------------------------------------------
+	**	If a data transfer phase is terminated too early
+	**	(after reception of a message (i.e. DISCONNECT)),
+	**	we have to prepare a mini script to transfer
+	**	the rest of the data.
+	**----------------------------------------------------------------
+	*/
+	ncrcmd		patch[8];
+
+	/*----------------------------------------------------------------
+	**	The general SCSI driver provides a
+	**	pointer to a control block.
+	**----------------------------------------------------------------
+	*/
+	struct scsi_cmnd	*cmd;		/* SCSI command 		*/
+	u_char		cdb_buf[16];	/* Copy of CDB			*/
+	u_char		sense_buf[64];
+	int		data_len;	/* Total data length		*/
+
+	/*----------------------------------------------------------------
+	**	Message areas.
+	**	We prepare a message to be sent after selection.
+	**	We may use a second one if the command is rescheduled 
+	**	due to GETCC or QFULL.
+	**      Contents are IDENTIFY and SIMPLE_TAG.
+	**	While negotiating sync or wide transfer,
+	**	a SDTR or WDTR message is appended.
+	**----------------------------------------------------------------
+	*/
+	u_char		scsi_smsg [8];
+	u_char		scsi_smsg2[8];
+
+	/*----------------------------------------------------------------
+	**	Other fields.
+	**----------------------------------------------------------------
+	*/
+	u_long		p_ccb;		/* BUS address of this CCB	*/
+	u_char		sensecmd[6];	/* Sense command		*/
+	u_char		tag;		/* Tag for this transfer	*/
+					/*  255 means no tag		*/
+	u_char		target;
+	u_char		lun;
+	u_char		queued;
+	u_char		auto_sense;
+	struct ccb *	link_ccb;	/* Host adapter CCB chain	*/
+	struct list_head link_ccbq;	/* Link to unit CCB queue	*/
+	u32		startp;		/* Initial data pointer		*/
+	u_long		magic;		/* Free / busy  CCB flag	*/
+};
+
+#define CCB_PHYS(cp,lbl)	(cp->p_ccb + offsetof(struct ccb, lbl))
+
+
+/*========================================================================
+**
+**      Declaration of structs:     NCR device descriptor
+**
+**========================================================================
+*/
+struct ncb {
+	/*----------------------------------------------------------------
+	**	The global header.
+	**	It is accessible to both the host and the script processor.
+	**	Must be cache line size aligned (32 for x86) in order to 
+	**	allow cache line bursting when it is copied to/from CCB.
+	**----------------------------------------------------------------
+	*/
+	struct head     header;
+
+	/*----------------------------------------------------------------
+	**	CCBs management queues.
+	**----------------------------------------------------------------
+	*/
+	struct scsi_cmnd	*waiting_list;	/* Commands waiting for a CCB	*/
+					/*  when lcb is not allocated.	*/
+	struct scsi_cmnd	*done_list;	/* Commands waiting for done()  */
+					/* callback to be invoked.      */ 
+	spinlock_t	smp_lock;	/* Lock for SMP threading       */
+
+	/*----------------------------------------------------------------
+	**	Chip and controller identification.
+	**----------------------------------------------------------------
+	*/
+	int		unit;		/* Unit number			*/
+	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_ctest0, sv_ctest3,
+		sv_ctest4, sv_ctest5, sv_gpcntl, sv_stest2, sv_stest4;
+
+	/*----------------------------------------------------------------
+	**	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_ctest0, rv_ctest3,
+		rv_ctest4, rv_ctest5, rv_stest2;
+
+	/*----------------------------------------------------------------
+	**	Targets management.
+	**	During reselection the ncr jumps to jump_tcb.
+	**	The SFBR register is loaded with the encoded target id.
+	**	For i = 0 to 3
+	**		SCR_JUMP ^ IFTRUE(MASK(i, 3)), @(next tcb mod. i)
+	**
+	**	Recent chips will prefetch the 4 JUMPS using only 1 burst.
+	**	It is kind of hashcoding.
+	**----------------------------------------------------------------
+	*/
+	struct link     jump_tcb[4];	/* JUMPs for reselection	*/
+	struct tcb  target[MAX_TARGET];	/* Target data			*/
+
+	/*----------------------------------------------------------------
+	**	Virtual and physical bus addresses of the chip.
+	**----------------------------------------------------------------
+	*/
+	void __iomem *vaddr;		/* Virtual and bus address of	*/
+	unsigned long	paddr;		/*  chip's IO registers.	*/
+	unsigned long	paddr2;		/* On-chip RAM bus address.	*/
+	volatile			/* Pointer to volatile for 	*/
+	struct ncr_reg	__iomem *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.
+	**----------------------------------------------------------------
+	*/
+	struct script	*script0;	/* Copies of script and scripth	*/
+	struct scripth	*scripth0;	/*  relocated for this ncb.	*/
+	struct scripth	*scripth;	/* Actual scripth virt. address	*/
+	u_long		p_script;	/* Actual script and scripth	*/
+	u_long		p_scripth;	/*  bus addresses.		*/
+
+	/*----------------------------------------------------------------
+	**	General controller parameters and configuration.
+	**----------------------------------------------------------------
+	*/
+	struct device	*dev;
+	u_char		revision_id;	/* PCI device revision id	*/
+	u32		irq;		/* IRQ level			*/
+	u32		features;	/* Chip features map		*/
+	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		multiplier;	/* Clock multiplier (1,2,4)	*/
+	u_char		clock_divn;	/* Number of clock divisors	*/
+	u_long		clock_khz;	/* SCSI clock frequency in KHz	*/
+
+	/*----------------------------------------------------------------
+	**	Start queue management.
+	**	It is filled up by the host processor and accessed by the 
+	**	SCRIPTS processor in order to start SCSI commands.
+	**----------------------------------------------------------------
+	*/
+	u16		squeueput;	/* Next free slot of the queue	*/
+	u16		actccbs;	/* Number of allocated CCBs	*/
+	u16		queuedccbs;	/* Number of CCBs in start queue*/
+	u16		queuedepth;	/* Start queue depth		*/
+
+	/*----------------------------------------------------------------
+	**	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 SCR_COPY script command.
+	**----------------------------------------------------------------
+	*/
+	u_char		msgout[8];	/* Buffer for MESSAGE OUT 	*/
+	u_char		msgin [8];	/* Buffer for MESSAGE IN	*/
+	u32		lastmsg;	/* Last SCSI message sent	*/
+	u_char		scratch;	/* Scratch for SCSI receive	*/
+
+	/*----------------------------------------------------------------
+	**	Miscellaneous configuration and status parameters.
+	**----------------------------------------------------------------
+	*/
+	u_char		disc;		/* Diconnection allowed		*/
+	u_char		scsi_mode;	/* Current SCSI BUS mode	*/
+	u_char		order;		/* Tag order to use		*/
+	u_char		verbose;	/* Verbosity for this controller*/
+	int		ncr_cache;	/* Used for cache test at init.	*/
+	u_long		p_ncb;		/* BUS address of this NCB	*/
+
+	/*----------------------------------------------------------------
+	**	Command completion handling.
+	**----------------------------------------------------------------
+	*/
+#ifdef SCSI_NCR_CCB_DONE_SUPPORT
+	struct ccb	*(ccb_done[MAX_DONE]);
+	int		ccb_done_ic;
+#endif
+	/*----------------------------------------------------------------
+	**	Fields that should be removed or changed.
+	**----------------------------------------------------------------
+	*/
+	struct ccb	*ccb;		/* Global CCB			*/
+	struct usrcmd	user;		/* Command from user		*/
+	volatile u_char	release_stage;	/* Synchronisation stage on release  */
+};
+
+#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))
+
+/*==========================================================
+**
+**
+**      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!
+**
+**----------------------------------------------------------
+*/
+
+/*
+**	For HP Zalon/53c720 systems, the Zalon interface
+**	between CPU and 53c720 does prefetches, which causes
+**	problems with self modifying scripts.  The problem
+**	is overcome by calling a dummy subroutine after each
+**	modification, to force a refetch of the script on
+**	return from the subroutine.
+*/
+
+#ifdef CONFIG_NCR53C8XX_PREFETCH
+#define PREFETCH_FLUSH_CNT	2
+#define PREFETCH_FLUSH		SCR_CALL, PADDRH (wait_dma),
+#else
+#define PREFETCH_FLUSH_CNT	0
+#define PREFETCH_FLUSH
+#endif
+
+/*
+**	Script fragments which are loaded into the on-chip RAM 
+**	of 825A, 875 and 895 chips.
+*/
+struct script {
+	ncrcmd	start		[  5];
+	ncrcmd  startpos	[  1];
+	ncrcmd	select		[  6];
+	ncrcmd	select2		[  9 + PREFETCH_FLUSH_CNT];
+	ncrcmd	loadpos		[  4];
+	ncrcmd	send_ident	[  9];
+	ncrcmd	prepare		[  6];
+	ncrcmd	prepare2	[  7];
+	ncrcmd  command		[  6];
+	ncrcmd  dispatch	[ 32];
+	ncrcmd  clrack		[  4];
+	ncrcmd	no_data		[ 17];
+	ncrcmd  status		[  8];
+	ncrcmd  msg_in		[  2];
+	ncrcmd  msg_in2		[ 16];
+	ncrcmd  msg_bad		[  4];
+	ncrcmd	setmsg		[  7];
+	ncrcmd	cleanup		[  6];
+	ncrcmd  complete	[  9];
+	ncrcmd	cleanup_ok	[  8 + PREFETCH_FLUSH_CNT];
+	ncrcmd	cleanup0	[  1];
+#ifndef SCSI_NCR_CCB_DONE_SUPPORT
+	ncrcmd	signal		[ 12];
+#else
+	ncrcmd	signal		[  9];
+	ncrcmd	done_pos	[  1];
+	ncrcmd	done_plug	[  2];
+	ncrcmd	done_end	[  7];
+#endif
+	ncrcmd  save_dp		[  7];
+	ncrcmd  restore_dp	[  5];
+	ncrcmd  disconnect	[ 10];
+	ncrcmd	msg_out		[  9];
+	ncrcmd	msg_out_done	[  7];
+	ncrcmd  idle		[  2];
+	ncrcmd	reselect	[  8];
+	ncrcmd	reselected	[  8];
+	ncrcmd	resel_dsa	[  6 + PREFETCH_FLUSH_CNT];
+	ncrcmd	loadpos1	[  4];
+	ncrcmd  resel_lun	[  6];
+	ncrcmd	resel_tag	[  6];
+	ncrcmd	jump_to_nexus	[  4 + PREFETCH_FLUSH_CNT];
+	ncrcmd	nexus_indirect	[  4];
+	ncrcmd	resel_notag	[  4];
+	ncrcmd  data_in		[MAX_SCATTERL * 4];
+	ncrcmd  data_in2	[  4];
+	ncrcmd  data_out	[MAX_SCATTERL * 4];
+	ncrcmd  data_out2	[  4];
+};
+
+/*
+**	Script fragments which stay in main memory for all chips.
+*/
+struct scripth {
+	ncrcmd  tryloop		[MAX_START*2];
+	ncrcmd  tryloop2	[  2];
+#ifdef SCSI_NCR_CCB_DONE_SUPPORT
+	ncrcmd  done_queue	[MAX_DONE*5];
+	ncrcmd  done_queue2	[  2];
+#endif
+	ncrcmd	select_no_atn	[  8];
+	ncrcmd	cancel		[  4];
+	ncrcmd	skip		[  9 + PREFETCH_FLUSH_CNT];
+	ncrcmd	skip2		[ 19];
+	ncrcmd	par_err_data_in	[  6];
+	ncrcmd	par_err_other	[  4];
+	ncrcmd	msg_reject	[  8];
+	ncrcmd	msg_ign_residue	[ 24];
+	ncrcmd  msg_extended	[ 10];
+	ncrcmd  msg_ext_2	[ 10];
+	ncrcmd	msg_wdtr	[ 14];
+	ncrcmd	send_wdtr	[  7];
+	ncrcmd  msg_ext_3	[ 10];
+	ncrcmd	msg_sdtr	[ 14];
+	ncrcmd	send_sdtr	[  7];
+	ncrcmd	nego_bad_phase	[  4];
+	ncrcmd	msg_out_abort	[ 10];
+	ncrcmd  hdata_in	[MAX_SCATTERH * 4];
+	ncrcmd  hdata_in2	[  2];
+	ncrcmd  hdata_out	[MAX_SCATTERH * 4];
+	ncrcmd  hdata_out2	[  2];
+	ncrcmd	reset		[  4];
+	ncrcmd	aborttag	[  4];
+	ncrcmd	abort		[  2];
+	ncrcmd	abort_resel	[ 20];
+	ncrcmd	resend_ident	[  4];
+	ncrcmd	clratn_go_on	[  3];
+	ncrcmd	nxtdsp_go_on	[  1];
+	ncrcmd	sdata_in	[  8];
+	ncrcmd  data_io		[ 18];
+	ncrcmd	bad_identify	[ 12];
+	ncrcmd	bad_i_t_l	[  4];
+	ncrcmd	bad_i_t_l_q	[  4];
+	ncrcmd	bad_target	[  8];
+	ncrcmd	bad_status	[  8];
+	ncrcmd	start_ram	[  4 + PREFETCH_FLUSH_CNT];
+	ncrcmd	start_ram0	[  4];
+	ncrcmd	sto_restart	[  5];
+	ncrcmd	wait_dma	[  2];
+	ncrcmd	snooptest	[  9];
+	ncrcmd	snoopend	[  2];
+};
+
+/*==========================================================
+**
+**
+**      Function headers.
+**
+**
+**==========================================================
+*/
+
+static	void	ncr_alloc_ccb	(struct ncb *np, u_char tn, u_char ln);
+static	void	ncr_complete	(struct ncb *np, struct ccb *cp);
+static	void	ncr_exception	(struct ncb *np);
+static	void	ncr_free_ccb	(struct ncb *np, struct ccb *cp);
+static	void	ncr_init_ccb	(struct ncb *np, struct ccb *cp);
+static	void	ncr_init_tcb	(struct ncb *np, u_char tn);
+static	struct lcb *	ncr_alloc_lcb	(struct ncb *np, u_char tn, u_char ln);
+static	struct lcb *	ncr_setup_lcb	(struct ncb *np, struct scsi_device *sdev);
+static	void	ncr_getclock	(struct ncb *np, int mult);
+static	void	ncr_selectclock	(struct ncb *np, u_char scntl3);
+static	struct ccb *ncr_get_ccb	(struct ncb *np, struct scsi_cmnd *cmd);
+static	void	ncr_chip_reset	(struct ncb *np, int delay);
+static	void	ncr_init	(struct ncb *np, int reset, char * msg, u_long code);
+static	int	ncr_int_sbmc	(struct ncb *np);
+static	int	ncr_int_par	(struct ncb *np);
+static	void	ncr_int_ma	(struct ncb *np);
+static	void	ncr_int_sir	(struct ncb *np);
+static  void    ncr_int_sto     (struct ncb *np);
+static	void	ncr_negotiate	(struct ncb* np, struct tcb* tp);
+static	int	ncr_prepare_nego(struct ncb *np, struct ccb *cp, u_char *msgptr);
+
+static	void	ncr_script_copy_and_bind
+				(struct ncb *np, ncrcmd *src, ncrcmd *dst, int len);
+static  void    ncr_script_fill (struct script * scr, struct scripth * scripth);
+static	int	ncr_scatter	(struct ncb *np, struct ccb *cp, struct scsi_cmnd *cmd);
+static	void	ncr_getsync	(struct ncb *np, u_char sfac, u_char *fakp, u_char *scntl3p);
+static	void	ncr_setsync	(struct ncb *np, struct ccb *cp, u_char scntl3, u_char sxfer);
+static	void	ncr_setup_tags	(struct ncb *np, struct scsi_device *sdev);
+static	void	ncr_setwide	(struct ncb *np, struct ccb *cp, u_char wide, u_char ack);
+static	int	ncr_snooptest	(struct ncb *np);
+static	void	ncr_timeout	(struct ncb *np);
+static  void    ncr_wakeup      (struct ncb *np, u_long code);
+static  void    ncr_wakeup_done (struct ncb *np);
+static	void	ncr_start_next_ccb (struct ncb *np, struct lcb * lp, int maxn);
+static	void	ncr_put_start_queue(struct ncb *np, struct ccb *cp);
+
+static void insert_into_waiting_list(struct ncb *np, struct scsi_cmnd *cmd);
+static struct scsi_cmnd *retrieve_from_waiting_list(int to_remove, struct ncb *np, struct scsi_cmnd *cmd);
+static void process_waiting_list(struct ncb *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)
+
+static inline char *ncr_name (struct ncb *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)))
+#if 0
+#define	KVAR(which)	(RELOC_KVAR | (which))
+#endif
+
+#if 0
+#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,
+	/*
+	**	Then jump to a certain point in tryloop.
+	**	Due to the lack of indirect addressing the code
+	**	is self modifying here.
+	*/
+	SCR_JUMP,
+}/*-------------------------< STARTPOS >--------------------*/,{
+		PADDRH(tryloop),
+
+}/*-------------------------< SELECT >----------------------*/,{
+	/*
+	**	DSA	contains the address of a scheduled
+	**		data structure.
+	**
+	**	SCRATCHA contains the address of the script,
+	**		which starts the next entry.
+	**
+	**	Set Initiator mode.
+	**
+	**	(Target mode is left as an exercise for the reader)
+	*/
+
+	SCR_CLR (SCR_TRG),
+		0,
+	SCR_LOAD_REG (HS_REG, HS_SELECTING),
+		0,
+
+	/*
+	**      And try to select this target.
+	*/
+	SCR_SEL_TBL_ATN ^ offsetof (struct dsb, select),
+		PADDR (reselect),
+
+}/*-------------------------< SELECT2 >----------------------*/,{
+	/*
+	**	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.
+	**	As a result the SCRIPTS instructions until 
+	**	LOADPOS + 2 should be executed in parallel with 
+	**	the SCSI core performing selection.
+	*/
+
+	/*
+	**	The MESSAGE_REJECT problem seems to be due to a selection 
+	**	timing problem.
+	**	Wait immediately for the selection to complete. 
+	**	(2.5x behaves so)
+	*/
+	SCR_JUMPR ^ IFFALSE (WHEN (SCR_MSG_OUT)),
+		0,
+
+	/*
+	**	Next time use the next slot.
+	*/
+	SCR_COPY (4),
+		RADDR (temp),
+		PADDR (startpos),
+	/*
+	**      The ncr doesn't have an indirect load
+	**	or store command. So we have to
+	**	copy part of the control block to a
+	**	fixed place, where we can access it.
+	**
+	**	We patch the address part of a
+	**	COPY command with the DSA-register.
+	*/
+	SCR_COPY_F (4),
+		RADDR (dsa),
+		PADDR (loadpos),
+	/*
+	**	Flush script prefetch if required
+	*/
+	PREFETCH_FLUSH
+	/*
+	**	then we do the actual copy.
+	*/
+	SCR_COPY (sizeof (struct head)),
+	/*
+	**	continued after the next label ...
+	*/
+}/*-------------------------< LOADPOS >---------------------*/,{
+		0,
+		NADDR (header),
+	/*
+	**	Wait for the next phase or the selection
+	**	to complete or time-out.
+	*/
+	SCR_JUMP ^ IFFALSE (WHEN (SCR_MSG_OUT)),
+		PADDR (prepare),
+
+}/*-------------------------< SEND_IDENT >----------------------*/,{
+	/*
+	**	Selection complete.
+	**	Send the IDENTIFY and SIMPLE_TAG messages
+	**	(and the EXTENDED_SDTR message)
+	*/
+	SCR_MOVE_TBL ^ SCR_MSG_OUT,
+		offsetof (struct dsb, smsg),
+	SCR_JUMP ^ IFTRUE (WHEN (SCR_MSG_OUT)),
+		PADDRH (resend_ident),
+	SCR_LOAD_REG (scratcha, 0x80),
+		0,
+	SCR_COPY (1),
+		RADDR (scratcha),
+		NADDR (lastmsg),
+}/*-------------------------< PREPARE >----------------------*/,{
+	/*
+	**      load the savep (saved pointer) into
+	**      the TEMP register (actual pointer)
+	*/
+	SCR_COPY (4),
+		NADDR (header.savep),
+		RADDR (temp),
+	/*
+	**      Initialize the status registers
+	*/
+	SCR_COPY (4),
+		NADDR (header.status),
+		RADDR (scr0),
+}/*-------------------------< PREPARE2 >---------------------*/,{
+	/*
+	**	Initialize the msgout buffer with a NOOP message.
+	*/
+	SCR_LOAD_REG (scratcha, NOP),
+		0,
+	SCR_COPY (1),
+		RADDR (scratcha),
+		NADDR (msgout),
+#if 0
+	SCR_COPY (1),
+		RADDR (scratcha),
+		NADDR (msgin),
+#endif
+	/*
+	**	Anticipate the COMMAND phase.
+	**	This is the normal case for initial selection.
+	*/
+	SCR_JUMP ^ IFFALSE (WHEN (SCR_COMMAND)),
+		PADDR (dispatch),
+
+}/*-------------------------< COMMAND >--------------------*/,{
+	/*
+	**	... and send the command
+	*/
+	SCR_MOVE_TBL ^ SCR_COMMAND,
+		offsetof (struct dsb, cmd),
+	/*
+	**	If status is still HS_NEGOTIATE, negotiation failed.
+	**	We check this here, since we want to do that 
+	**	only once.
+	*/
+	SCR_FROM_REG (HS_REG),
+		0,
+	SCR_INT ^ IFTRUE (DATA (HS_NEGOTIATE)),
+		SIR_NEGO_FAILED,
+
+}/*-----------------------< 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_RETURN ^ IFTRUE (IF (SCR_DATA_OUT)),
+		0,
+	/*
+	**	DEL 397 - 53C875 Rev 3 - Part Number 609-0392410 - ITEM 4.
+	**	Possible data corruption during Memory Write and Invalidate.
+	**	This work-around resets the addressing logic prior to the 
+	**	start of the first MOVE of a DATA IN phase.
+	**	(See Documentation/scsi/ncr53c8xx.txt for more information)
+	*/
+	SCR_JUMPR ^ IFFALSE (IF (SCR_DATA_IN)),
+		20,
+	SCR_COPY (4),
+		RADDR (scratcha),
+		RADDR (scratcha),
+	SCR_RETURN,
+ 		0,
+	SCR_JUMP ^ IFTRUE (IF (SCR_STATUS)),
+		PADDR (status),
+	SCR_JUMP ^ IFTRUE (IF (SCR_COMMAND)),
+		PADDR (command),
+	SCR_JUMP ^ IFTRUE (IF (SCR_MSG_OUT)),
+		PADDR (msg_out),
+	/*
+	**      Discard one illegal phase byte, if required.
+	*/
+	SCR_LOAD_REG (scratcha, XE_BAD_PHASE),
+		0,
+	SCR_COPY (1),
+		RADDR (scratcha),
+		NADDR (xerr_st),
+	SCR_JUMPR ^ IFFALSE (IF (SCR_ILG_OUT)),
+		8,
+	SCR_MOVE_ABS (1) ^ SCR_ILG_OUT,
+		NADDR (scratch),
+	SCR_JUMPR ^ IFFALSE (IF (SCR_ILG_IN)),
+		8,
+	SCR_MOVE_ABS (1) ^ SCR_ILG_IN,
+		NADDR (scratch),
+	SCR_JUMP,
+		PADDR (dispatch),
+
+}/*-------------------------< CLRACK >----------------------*/,{
+	/*
+	**	Terminate possible pending message phase.
+	*/
+	SCR_CLR (SCR_ACK),
+		0,
+	SCR_JUMP,
+		PADDR (dispatch),
+
+}/*-------------------------< NO_DATA >--------------------*/,{
+	/*
+	**	The target wants to tranfer too much data
+	**	or in the wrong direction.
+	**      Remember that in extended error.
+	*/
+	SCR_LOAD_REG (scratcha, XE_EXTRA_DATA),
+		0,
+	SCR_COPY (1),
+		RADDR (scratcha),
+		NADDR (xerr_st),
+	/*
+	**      Discard one data byte, if required.
+	*/
+	SCR_JUMPR ^ IFFALSE (WHEN (SCR_DATA_OUT)),
+		8,
+	SCR_MOVE_ABS (1) ^ SCR_DATA_OUT,
+		NADDR (scratch),
+	SCR_JUMPR ^ IFFALSE (IF (SCR_DATA_IN)),
+		8,
+	SCR_MOVE_ABS (1) ^ SCR_DATA_IN,
+		NADDR (scratch),
+	/*
+	**      .. and repeat as required.
+	*/
+	SCR_CALL,
+		PADDR (dispatch),
+	SCR_JUMP,
+		PADDR (no_data),
+
+}/*-------------------------< STATUS >--------------------*/,{
+	/*
+	**	get the status
+	*/
+	SCR_MOVE_ABS (1) ^ SCR_STATUS,
+		NADDR (scratch),
+	/*
+	**	save status to scsi_status.
+	**	mark as complete.
+	*/
+	SCR_TO_REG (SS_REG),
+		0,
+	SCR_LOAD_REG (HS_REG, HS_COMPLETE),
+		0,
+	SCR_JUMP,
+		PADDR (dispatch),
+}/*-------------------------< MSG_IN >--------------------*/,{
+	/*
+	**	Get the first byte of the message
+	**	and save it to SCRATCHA.
+	**
+	**	The script processor doesn't negate the
+	**	ACK signal after this transfer.
+	*/
+	SCR_MOVE_ABS (1) ^ SCR_MSG_IN,
+		NADDR (msgin[0]),
+}/*-------------------------< MSG_IN2 >--------------------*/,{
+	/*
+	**	Handle this message.
+	*/
+	SCR_JUMP ^ IFTRUE (DATA (COMMAND_COMPLETE)),
+		PADDR (complete),
+	SCR_JUMP ^ IFTRUE (DATA (DISCONNECT)),
+		PADDR (disconnect),
+	SCR_JUMP ^ IFTRUE (DATA (SAVE_POINTERS)),
+		PADDR (save_dp),
+	SCR_JUMP ^ IFTRUE (DATA (RESTORE_POINTERS)),
+		PADDR (restore_dp),
+	SCR_JUMP ^ IFTRUE (DATA (EXTENDED_MESSAGE)),
+		PADDRH (msg_extended),
+	SCR_JUMP ^ IFTRUE (DATA (NOP)),
+		PADDR (clrack),
+	SCR_JUMP ^ IFTRUE (DATA (MESSAGE_REJECT)),
+		PADDRH (msg_reject),
+	SCR_JUMP ^ IFTRUE (DATA (IGNORE_WIDE_RESIDUE)),
+		PADDRH (msg_ign_residue),
+	/*
+	**	Rest of the messages left as
+	**	an exercise ...
+	**
+	**	Unimplemented messages:
+	**	fall through to MSG_BAD.
+	*/
+}/*-------------------------< MSG_BAD >------------------*/,{
+	/*
+	**	unimplemented message - reject it.
+	*/
+	SCR_INT,
+		SIR_REJECT_SENT,
+	SCR_LOAD_REG (scratcha, MESSAGE_REJECT),
+		0,
+}/*-------------------------< SETMSG >----------------------*/,{
+	SCR_COPY (1),
+		RADDR (scratcha),
+		NADDR (msgout),
+	SCR_SET (SCR_ATN),
+		0,
+	SCR_JUMP,
+		PADDR (clrack),
+}/*-------------------------< CLEANUP >-------------------*/,{
+	/*
+	**      dsa:    Pointer to ccb
+	**	      or xxxxxxFF (no ccb)
+	**
+	**      HS_REG:   Host-Status (<>0!)
+	*/
+	SCR_FROM_REG (dsa),
+		0,
+	SCR_JUMP ^ IFTRUE (DATA (0xff)),
+		PADDR (start),
+	/*
+	**      dsa is valid.
+	**	complete the cleanup.
+	*/
+	SCR_JUMP,
+		PADDR (cleanup_ok),
+
+}/*-------------------------< COMPLETE >-----------------*/,{
+	/*
+	**	Complete message.
+	**
+	**	Copy TEMP register to LASTP in header.
+	*/
+	SCR_COPY (4),
+		RADDR (temp),
+		NADDR (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,
+}/*-------------------------< CLEANUP_OK >----------------*/,{
+	/*
+	**	Save host status to header.
+	*/
+	SCR_COPY (4),
+		RADDR (scr0),
+		NADDR (header.status),
+	/*
+	**	and copy back the header to the ccb.
+	*/
+	SCR_COPY_F (4),
+		RADDR (dsa),
+		PADDR (cleanup0),
+	/*
+	**	Flush script prefetch if required
+	*/
+	PREFETCH_FLUSH
+	SCR_COPY (sizeof (struct head)),
+		NADDR (header),
+}/*-------------------------< CLEANUP0 >--------------------*/,{
+		0,
+}/*-------------------------< SIGNAL >----------------------*/,{
+	/*
+	**	if job not completed ...
+	*/
+	SCR_FROM_REG (HS_REG),
+		0,
+	/*
+	**	... start the next command.
+	*/
+	SCR_JUMP ^ IFTRUE (MASK (0, (HS_DONEMASK|HS_SKIPMASK))),
+		PADDR(start),
+	/*
+	**	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),
+
+#ifndef	SCSI_NCR_CCB_DONE_SUPPORT
+
+	/*
+	**	... signal completion to the host
+	*/
+	SCR_INT,
+		SIR_INTFLY,
+	/*
+	**	Auf zu neuen Schandtaten!
+	*/
+	SCR_JUMP,
+		PADDR(start),
+
+#else	/* defined SCSI_NCR_CCB_DONE_SUPPORT */
+
+	/*
+	**	... signal completion to the host
+	*/
+	SCR_JUMP,
+}/*------------------------< DONE_POS >---------------------*/,{
+		PADDRH (done_queue),
+}/*------------------------< DONE_PLUG >--------------------*/,{
+	SCR_INT,
+		SIR_DONE_OVERFLOW,
+}/*------------------------< DONE_END >---------------------*/,{
+	SCR_INT,
+		SIR_INTFLY,
+	SCR_COPY (4),
+		RADDR (temp),
+		PADDR (done_pos),
+	SCR_JUMP,
+		PADDR (start),
+
+#endif	/* SCSI_NCR_CCB_DONE_SUPPORT */
+
+}/*-------------------------< SAVE_DP >------------------*/,{
+	/*
+	**	SAVE_DP message:
+	**	Copy TEMP register to SAVEP in header.
+	*/
+	SCR_COPY (4),
+		RADDR (temp),
+		NADDR (header.savep),
+	SCR_CLR (SCR_ACK),
+		0,
+	SCR_JUMP,
+		PADDR (dispatch),
+}/*-------------------------< RESTORE_DP >---------------*/,{
+	/*
+	**	RESTORE_DP message:
+	**	Copy SAVEP in header to TEMP register.
+	*/
+	SCR_COPY (4),
+		NADDR (header.savep),
+		RADDR (temp),
+	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,
+	SCR_JUMP,
+		PADDR (cleanup_ok),
+
+}/*-------------------------< MSG_OUT >-------------------*/,{
+	/*
+	**	The target requests a message.
+	*/
+	SCR_MOVE_ABS (1) ^ SCR_MSG_OUT,
+		NADDR (msgout),
+	SCR_COPY (1),
+		NADDR (msgout),
+		NADDR (lastmsg),
+	/*
+	**	If it was no ABORT message ...
+	*/
+	SCR_JUMP ^ IFTRUE (DATA (ABORT_TASK_SET)),
+		PADDRH (msg_out_abort),
+	/*
+	**	... wait for the next phase
+	**	if it's a message out, send it again, ...
+	*/
+	SCR_JUMP ^ IFTRUE (WHEN (SCR_MSG_OUT)),
+		PADDR (msg_out),
+}/*-------------------------< MSG_OUT_DONE >--------------*/,{
+	/*
+	**	... else clear the message ...
+	*/
+	SCR_LOAD_REG (scratcha, NOP),
+		0,
+	SCR_COPY (4),
+		RADDR (scratcha),
+		NADDR (msgout),
+	/*
+	**	... and process the next phase
+	*/
+	SCR_JUMP,
+		PADDR (dispatch),
+}/*-------------------------< 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,
+}/*-------------------------< RESELECT >--------------------*/,{
+	/*
+	**	make the DSA invalid.
+	*/
+	SCR_LOAD_REG (dsa, 0xff),
+		0,
+	SCR_CLR (SCR_TRG),
+		0,
+	SCR_LOAD_REG (HS_REG, HS_IN_RESELECT),
+		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,
+	/*
+	**	... zu nichts zu gebrauchen ?
+	**
+	**      load the target id into the SFBR
+	**	and jump to the control block.
+	**
+	**	Look at the declarations of
+	**	- struct ncb
+	**	- struct tcb
+	**	- struct lcb
+	**	- struct ccb
+	**	to understand what's going on.
+	*/
+	SCR_REG_SFBR (ssid, SCR_AND, 0x8F),
+		0,
+	SCR_TO_REG (sdid),
+		0,
+	SCR_JUMP,
+		NADDR (jump_tcb),
+
+}/*-------------------------< RESEL_DSA >-------------------*/,{
+	/*
+	**	Ack the IDENTIFY or TAG previously received.
+	*/
+	SCR_CLR (SCR_ACK),
+		0,
+	/*
+	**      The ncr doesn't have an indirect load
+	**	or store command. So we have to
+	**	copy part of the control block to a
+	**	fixed place, where we can access it.
+	**
+	**	We patch the address part of a
+	**	COPY command with the DSA-register.
+	*/
+	SCR_COPY_F (4),
+		RADDR (dsa),
+		PADDR (loadpos1),
+	/*
+	**	Flush script prefetch if required
+	*/
+	PREFETCH_FLUSH
+	/*
+	**	then we do the actual copy.
+	*/
+	SCR_COPY (sizeof (struct head)),
+	/*
+	**	continued after the next label ...
+	*/
+
+}/*-------------------------< LOADPOS1 >-------------------*/,{
+		0,
+		NADDR (header),
+	/*
+	**	The DSA contains the data structure address.
+	*/
+	SCR_JUMP,
+		PADDR (prepare),
+
+}/*-------------------------< RESEL_LUN >-------------------*/,{
+	/*
+	**	come back to this point
+	**	to get an IDENTIFY message
+	**	Wait for a msg_in phase.
+	*/
+	SCR_INT ^ IFFALSE (WHEN (SCR_MSG_IN)),
+		SIR_RESEL_NO_MSG_IN,
+	/*
+	**	message phase.
+	**	Read the data directly from the BUS DATA lines.
+	**	This helps to support very old SCSI devices that 
+	**	may reselect without sending an IDENTIFY.
+	*/
+	SCR_FROM_REG (sbdl),
+		0,
+	/*
+	**	It should be an Identify message.
+	*/
+	SCR_RETURN,
+		0,
+}/*-------------------------< RESEL_TAG >-------------------*/,{
+	/*
+	**	Read IDENTIFY + SIMPLE + TAG using a single MOVE.
+	**	Aggressive optimization, is'nt it?
+	**	No need to test the SIMPLE TAG message, since the 
+	**	driver only supports conformant devices for tags. ;-)
+	*/
+	SCR_MOVE_ABS (3) ^ 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,
+	SCR_SFBR_REG (temp, SCR_AND, 0xfc),
+		0,
+}/*-------------------------< JUMP_TO_NEXUS >-------------------*/,{
+	SCR_COPY_F (4),
+		RADDR (temp),
+		PADDR (nexus_indirect),
+	/*
+	**	Flush script prefetch if required
+	*/
+	PREFETCH_FLUSH
+	SCR_COPY (4),
+}/*-------------------------< NEXUS_INDIRECT >-------------------*/,{
+		0,
+		RADDR (temp),
+	SCR_RETURN,
+		0,
+}/*-------------------------< RESEL_NOTAG >-------------------*/,{
+	/*
+	**	No tag expected.
+	**	Read an throw away the IDENTIFY.
+	*/
+	SCR_MOVE_ABS (1) ^ SCR_MSG_IN,
+		NADDR (msgin),
+	SCR_JUMP,
+		PADDR (jump_to_nexus),
+}/*-------------------------< DATA_IN >--------------------*/,{
+/*
+**	Because the size depends on the
+**	#define MAX_SCATTERL parameter,
+**	it is filled in at runtime.
+**
+**  ##===========< i=0; i<MAX_SCATTERL >=========
+**  ||	SCR_CALL ^ IFFALSE (WHEN (SCR_DATA_IN)),
+**  ||		PADDR (dispatch),
+**  ||	SCR_MOVE_TBL ^ SCR_DATA_IN,
+**  ||		offsetof (struct dsb, data[ i]),
+**  ##==========================================
+**
+**---------------------------------------------------------
+*/
+0
+}/*-------------------------< DATA_IN2 >-------------------*/,{
+	SCR_CALL,
+		PADDR (dispatch),
+	SCR_JUMP,
+		PADDR (no_data),
+}/*-------------------------< DATA_OUT >--------------------*/,{
+/*
+**	Because the size depends on the
+**	#define MAX_SCATTERL parameter,
+**	it is filled in at runtime.
+**
+**  ##===========< i=0; i<MAX_SCATTERL >=========
+**  ||	SCR_CALL ^ IFFALSE (WHEN (SCR_DATA_OUT)),
+**  ||		PADDR (dispatch),
+**  ||	SCR_MOVE_TBL ^ SCR_DATA_OUT,
+**  ||		offsetof (struct dsb, data[ i]),
+**  ##==========================================
+**
+**---------------------------------------------------------
+*/
+0
+}/*-------------------------< DATA_OUT2 >-------------------*/,{
+	SCR_CALL,
+		PADDR (dispatch),
+	SCR_JUMP,
+		PADDR (no_data),
+}/*--------------------------------------------------------*/
+};
+
+static	struct scripth scripth0 __initdata = {
+/*-------------------------< TRYLOOP >---------------------*/{
+/*
+**	Start the next entry.
+**	Called addresses point to the launch script in the CCB.
+**	They are patched by the main processor.
+**
+**	Because the size depends on the
+**	#define MAX_START parameter, it is filled
+**	in at runtime.
+**
+**-----------------------------------------------------------
+**
+**  ##===========< I=0; i<MAX_START >===========
+**  ||	SCR_CALL,
+**  ||		PADDR (idle),
+**  ##==========================================
+**
+**-----------------------------------------------------------
+*/
+0
+}/*------------------------< TRYLOOP2 >---------------------*/,{
+	SCR_JUMP,
+		PADDRH(tryloop),
+
+#ifdef SCSI_NCR_CCB_DONE_SUPPORT
+
+}/*------------------------< DONE_QUEUE >-------------------*/,{
+/*
+**	Copy the CCB address to the next done entry.
+**	Because the size depends on the
+**	#define MAX_DONE parameter, it is filled
+**	in at runtime.
+**
+**-----------------------------------------------------------
+**
+**  ##===========< I=0; i<MAX_DONE >===========
+**  ||	SCR_COPY (sizeof(struct ccb *),
+**  ||		NADDR (header.cp),
+**  ||		NADDR (ccb_done[i]),
+**  ||	SCR_CALL,
+**  ||		PADDR (done_end),
+**  ##==========================================
+**
+**-----------------------------------------------------------
+*/
+0
+}/*------------------------< DONE_QUEUE2 >------------------*/,{
+	SCR_JUMP,
+		PADDRH (done_queue),
+
+#endif /* SCSI_NCR_CCB_DONE_SUPPORT */
+}/*------------------------< SELECT_NO_ATN >-----------------*/,{
+	/*
+	**	Set Initiator mode.
+	**      And try to select this target without ATN.
+	*/
+
+	SCR_CLR (SCR_TRG),
+		0,
+	SCR_LOAD_REG (HS_REG, HS_SELECTING),
+		0,
+	SCR_SEL_TBL ^ offsetof (struct dsb, select),
+		PADDR (reselect),
+	SCR_JUMP,
+		PADDR (select2),
+
+}/*-------------------------< CANCEL >------------------------*/,{
+
+	SCR_LOAD_REG (scratcha, HS_ABORTED),
+		0,
+	SCR_JUMPR,
+		8,
+}/*-------------------------< SKIP >------------------------*/,{
+	SCR_LOAD_REG (scratcha, 0),
+		0,
+	/*
+	**	This entry has been canceled.
+	**	Next time use the next slot.
+	*/
+	SCR_COPY (4),
+		RADDR (temp),
+		PADDR (startpos),
+	/*
+	**      The ncr doesn't have an indirect load
+	**	or store command. So we have to
+	**	copy part of the control block to a
+	**	fixed place, where we can access it.
+	**
+	**	We patch the address part of a
+	**	COPY command with the DSA-register.
+	*/
+	SCR_COPY_F (4),
+		RADDR (dsa),
+		PADDRH (skip2),
+	/*
+	**	Flush script prefetch if required
+	*/
+	PREFETCH_FLUSH
+	/*
+	**	then we do the actual copy.
+	*/
+	SCR_COPY (sizeof (struct head)),
+	/*
+	**	continued after the next label ...
+	*/
+}/*-------------------------< SKIP2 >---------------------*/,{
+		0,
+		NADDR (header),
+	/*
+	**      Initialize the status registers
+	*/
+	SCR_COPY (4),
+		NADDR (header.status),
+		RADDR (scr0),
+	/*
+	**	Force host status.
+	*/
+	SCR_FROM_REG (scratcha),
+		0,
+	SCR_JUMPR ^ IFFALSE (MASK (0, HS_DONEMASK)),
+		16,
+	SCR_REG_REG (HS_REG, SCR_OR, HS_SKIPMASK),
+		0,
+	SCR_JUMPR,
+		8,
+	SCR_TO_REG (HS_REG),
+		0,
+	SCR_LOAD_REG (SS_REG, S_GOOD),
+		0,
+	SCR_JUMP,
+		PADDR (cleanup_ok),
+
+},/*-------------------------< PAR_ERR_DATA_IN >---------------*/{
+	/*
+	**	Ignore all data in byte, until next phase
+	*/
+	SCR_JUMP ^ IFFALSE (WHEN (SCR_DATA_IN)),
+		PADDRH (par_err_other),
+	SCR_MOVE_ABS (1) ^ SCR_DATA_IN,
+		NADDR (scratch),
+	SCR_JUMPR,
+		-24,
+},/*-------------------------< PAR_ERR_OTHER >------------------*/{
+	/*
+	**	count it.
+	*/
+	SCR_REG_REG (PS_REG, SCR_ADD, 0x01),
+		0,
+	/*
+	**	jump to dispatcher.
+	*/
+	SCR_JUMP,
+		PADDR (dispatch),
+}/*-------------------------< MSG_REJECT >---------------*/,{
+	/*
+	**	If a negotiation was in progress,
+	**	negotiation failed.
+	**	Otherwise, let the C code print 
+	**	some message.
+	*/
+	SCR_FROM_REG (HS_REG),
+		0,
+	SCR_INT ^ IFFALSE (DATA (HS_NEGOTIATE)),
+		SIR_REJECT_RECEIVED,
+	SCR_INT ^ IFTRUE (DATA (HS_NEGOTIATE)),
+		SIR_NEGO_FAILED,
+	SCR_JUMP,
+		PADDR (clrack),
+
+}/*-------------------------< MSG_IGN_RESIDUE >----------*/,{
+	/*
+	**	Terminate cycle
+	*/
+	SCR_CLR (SCR_ACK),
+		0,
+	SCR_JUMP ^ IFFALSE (WHEN (SCR_MSG_IN)),
+		PADDR (dispatch),
+	/*
+	**	get residue size.
+	*/
+	SCR_MOVE_ABS (1) ^ SCR_MSG_IN,
+		NADDR (msgin[1]),
+	/*
+	**	Size is 0 .. ignore message.
+	*/
+	SCR_JUMP ^ IFTRUE (DATA (0)),
+		PADDR (clrack),
+	/*
+	**	Size is not 1 .. have to interrupt.
+	*/
+	SCR_JUMPR ^ IFFALSE (DATA (1)),
+		40,
+	/*
+	**	Check for residue byte in swide register
+	*/
+	SCR_FROM_REG (scntl2),
+		0,
+	SCR_JUMPR ^ IFFALSE (MASK (WSR, WSR)),
+		16,
+	/*
+	**	There IS data in the swide register.
+	**	Discard it.
+	*/
+	SCR_REG_REG (scntl2, SCR_OR, WSR),
+		0,
+	SCR_JUMP,
+		PADDR (clrack),
+	/*
+	**	Load again the size to the sfbr register.
+	*/
+	SCR_FROM_REG (scratcha),
+		0,
+	SCR_INT,
+		SIR_IGN_RESIDUE,
+	SCR_JUMP,
+		PADDR (clrack),
+
+}/*-------------------------< MSG_EXTENDED >-------------*/,{
+	/*
+	**	Terminate cycle
+	*/
+	SCR_CLR (SCR_ACK),
+		0,
+	SCR_JUMP ^ IFFALSE (WHEN (SCR_MSG_IN)),
+		PADDR (dispatch),
+	/*
+	**	get length.
+	*/
+	SCR_MOVE_ABS (1) ^ SCR_MSG_IN,
+		NADDR (msgin[1]),
+	/*
+	*/
+	SCR_JUMP ^ IFTRUE (DATA (3)),
+		PADDRH (msg_ext_3),
+	SCR_JUMP ^ IFFALSE (DATA (2)),
+		PADDR (msg_bad),
+}/*-------------------------< MSG_EXT_2 >----------------*/,{
+	SCR_CLR (SCR_ACK),
+		0,
+	SCR_JUMP ^ IFFALSE (WHEN (SCR_MSG_IN)),
+		PADDR (dispatch),
+	/*
+	**	get extended message code.
+	*/
+	SCR_MOVE_ABS (1) ^ SCR_MSG_IN,
+		NADDR (msgin[2]),
+	SCR_JUMP ^ IFTRUE (DATA (EXTENDED_WDTR)),
+		PADDRH (msg_wdtr),
+	/*
+	**	unknown extended message
+	*/
+	SCR_JUMP,
+		PADDR (msg_bad)
+}/*-------------------------< MSG_WDTR >-----------------*/,{
+	SCR_CLR (SCR_ACK),
+		0,
+	SCR_JUMP ^ IFFALSE (WHEN (SCR_MSG_IN)),
+		PADDR (dispatch),
+	/*
+	**	get data bus width
+	*/
+	SCR_MOVE_ABS (1) ^ SCR_MSG_IN,
+		NADDR (msgin[3]),
+	/*
+	**	let the host do the real work.
+	*/
+	SCR_INT,
+		SIR_NEGO_WIDE,
+	/*
+	**	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 EXTENDED_WDTR
+	*/
+	SCR_MOVE_ABS (4) ^ SCR_MSG_OUT,
+		NADDR (msgout),
+	SCR_COPY (1),
+		NADDR (msgout),
+		NADDR (lastmsg),
+	SCR_JUMP,
+		PADDR (msg_out_done),
+
+}/*-------------------------< MSG_EXT_3 >----------------*/,{
+	SCR_CLR (SCR_ACK),
+		0,
+	SCR_JUMP ^ IFFALSE (WHEN (SCR_MSG_IN)),
+		PADDR (dispatch),
+	/*
+	**	get extended message code.
+	*/
+	SCR_MOVE_ABS (1) ^ SCR_MSG_IN,
+		NADDR (msgin[2]),
+	SCR_JUMP ^ IFTRUE (DATA (EXTENDED_SDTR)),
+		PADDRH (msg_sdtr),
+	/*
+	**	unknown extended message
+	*/
+	SCR_JUMP,
+		PADDR (msg_bad)
+
+}/*-------------------------< MSG_SDTR >-----------------*/,{
+	SCR_CLR (SCR_ACK),
+		0,
+	SCR_JUMP ^ IFFALSE (WHEN (SCR_MSG_IN)),
+		PADDR (dispatch),
+	/*
+	**	get period and offset
+	*/
+	SCR_MOVE_ABS (2) ^ SCR_MSG_IN,
+		NADDR (msgin[3]),
+	/*
+	**	let the host do the real work.
+	*/
+	SCR_INT,
+		SIR_NEGO_SYNC,
+	/*
+	**	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 EXTENDED_SDTR
+	*/
+	SCR_MOVE_ABS (5) ^ SCR_MSG_OUT,
+		NADDR (msgout),
+	SCR_COPY (1),
+		NADDR (msgout),
+		NADDR (lastmsg),
+	SCR_JUMP,
+		PADDR (msg_out_done),
+
+}/*-------------------------< NEGO_BAD_PHASE >------------*/,{
+	SCR_INT,
+		SIR_NEGO_PROTO,
+	SCR_JUMP,
+		PADDR (dispatch),
+
+}/*-------------------------< MSG_OUT_ABORT >-------------*/,{
+	/*
+	**	After ABORT message,
+	**
+	**	expect an immediate disconnect, ...
+	*/
+	SCR_REG_REG (scntl2, SCR_AND, 0x7f),
+		0,
+	SCR_CLR (SCR_ACK|SCR_ATN),
+		0,
+	SCR_WAIT_DISC,
+		0,
+	/*
+	**	... and set the status to "ABORTED"
+	*/
+	SCR_LOAD_REG (HS_REG, HS_ABORTED),
+		0,
+	SCR_JUMP,
+		PADDR (cleanup),
+
+}/*-------------------------< HDATA_IN >-------------------*/,{
+/*
+**	Because the size depends on the
+**	#define MAX_SCATTERH parameter,
+**	it is filled in at runtime.
+**
+**  ##==< i=MAX_SCATTERL; i<MAX_SCATTERL+MAX_SCATTERH >==
+**  ||	SCR_CALL ^ IFFALSE (WHEN (SCR_DATA_IN)),
+**  ||		PADDR (dispatch),
+**  ||	SCR_MOVE_TBL ^ SCR_DATA_IN,
+**  ||		offsetof (struct dsb, data[ i]),
+**  ##===================================================
+**
+**---------------------------------------------------------
+*/
+0
+}/*-------------------------< HDATA_IN2 >------------------*/,{
+	SCR_JUMP,
+		PADDR (data_in),
+
+}/*-------------------------< HDATA_OUT >-------------------*/,{
+/*
+**	Because the size depends on the
+**	#define MAX_SCATTERH parameter,
+**	it is filled in at runtime.
+**
+**  ##==< i=MAX_SCATTERL; i<MAX_SCATTERL+MAX_SCATTERH >==
+**  ||	SCR_CALL ^ IFFALSE (WHEN (SCR_DATA_OUT)),
+**  ||		PADDR (dispatch),
+**  ||	SCR_MOVE_TBL ^ SCR_DATA_OUT,
+**  ||		offsetof (struct dsb, data[ i]),
+**  ##===================================================
+**
+**---------------------------------------------------------
+*/
+0
+}/*-------------------------< HDATA_OUT2 >------------------*/,{
+	SCR_JUMP,
+		PADDR (data_out),
+
+}/*-------------------------< RESET >----------------------*/,{
+	/*
+	**      Send a TARGET_RESET message if bad IDENTIFY 
+	**	received on reselection.
+	*/
+	SCR_LOAD_REG (scratcha, ABORT_TASK),
+		0,
+	SCR_JUMP,
+		PADDRH (abort_resel),
+}/*-------------------------< ABORTTAG >-------------------*/,{
+	/*
+	**      Abort a wrong tag received on reselection.
+	*/
+	SCR_LOAD_REG (scratcha, ABORT_TASK),
+		0,
+	SCR_JUMP,
+		PADDRH (abort_resel),
+}/*-------------------------< ABORT >----------------------*/,{
+	/*
+	**      Abort a reselection when no active CCB.
+	*/
+	SCR_LOAD_REG (scratcha, ABORT_TASK_SET),
+		0,
+}/*-------------------------< ABORT_RESEL >----------------*/,{
+	SCR_COPY (1),
+		RADDR (scratcha),
+		NADDR (msgout),
+	SCR_SET (SCR_ATN),
+		0,
+	SCR_CLR (SCR_ACK),
+		0,
+	/*
+	**	and send it.
+	**	we expect an immediate disconnect
+	*/
+	SCR_REG_REG (scntl2, SCR_AND, 0x7f),
+		0,
+	SCR_MOVE_ABS (1) ^ SCR_MSG_OUT,
+		NADDR (msgout),
+	SCR_COPY (1),
+		NADDR (msgout),
+		NADDR (lastmsg),
+	SCR_CLR (SCR_ACK|SCR_ATN),
+		0,
+	SCR_WAIT_DISC,
+		0,
+	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),
+}/*-------------------------< CLRATN_GO_ON >-------------------*/,{
+	SCR_CLR (SCR_ATN),
+		0,
+	SCR_JUMP,
+}/*-------------------------< NXTDSP_GO_ON >-------------------*/,{
+		0,
+}/*-------------------------< SDATA_IN >-------------------*/,{
+	SCR_CALL ^ IFFALSE (WHEN (SCR_DATA_IN)),
+		PADDR (dispatch),
+	SCR_MOVE_TBL ^ SCR_DATA_IN,
+		offsetof (struct dsb, sense),
+	SCR_CALL,
+		PADDR (dispatch),
+	SCR_JUMP,
+		PADDR (no_data),
+}/*-------------------------< 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_JUMPR ^ IFTRUE (WHEN (SCR_DATA_OUT)),
+		32,
+	/*
+	**	Direction is DATA IN.
+	**	Warning: we jump here, even when phase is DATA OUT.
+	*/
+	SCR_COPY (4),
+		NADDR (header.lastp),
+		NADDR (header.savep),
+
+	/*
+	**	Jump to the SCRIPTS according to actual direction.
+	*/
+	SCR_COPY (4),
+		NADDR (header.savep),
+		RADDR (temp),
+	SCR_RETURN,
+		0,
+	/*
+	**	Direction is DATA OUT.
+	*/
+	SCR_COPY (4),
+		NADDR (header.wlastp),
+		NADDR (header.lastp),
+	SCR_COPY (4),
+		NADDR (header.wgoalp),
+		NADDR (header.goalp),
+	SCR_JUMPR,
+		-64,
+}/*-------------------------< BAD_IDENTIFY >---------------*/,{
+	/*
+	**	If message phase but not an IDENTIFY,
+	**	get some help from the C code.
+	**	Old SCSI device may behave so.
+	*/
+	SCR_JUMPR ^ IFTRUE (MASK (0x80, 0x80)),
+		16,
+	SCR_INT,
+		SIR_RESEL_NO_IDENTIFY,
+	SCR_JUMP,
+		PADDRH (reset),
+	/*
+	**	Message is an IDENTIFY, but lun is unknown.
+	**	Read the message, since we got it directly 
+	**	from the SCSI BUS data lines.
+	**	Signal problem to C code for logging the event.
+	**	Send an ABORT_TASK_SET to clear all pending tasks.
+	*/
+	SCR_INT,
+		SIR_RESEL_BAD_LUN,
+	SCR_MOVE_ABS (1) ^ SCR_MSG_IN,
+		NADDR (msgin),
+	SCR_JUMP,
+		PADDRH (abort),
+}/*-------------------------< BAD_I_T_L >------------------*/,{
+	/*
+	**	We donnot have a task for that I_T_L.
+	**	Signal problem to C code for logging the event.
+	**	Send an ABORT_TASK_SET message.
+	*/
+	SCR_INT,
+		SIR_RESEL_BAD_I_T_L,
+	SCR_JUMP,
+		PADDRH (abort),
+}/*-------------------------< BAD_I_T_L_Q >----------------*/,{
+	/*
+	**	We donnot have a task that matches the tag.
+	**	Signal problem to C code for logging the event.
+	**	Send an ABORT_TASK message.
+	*/
+	SCR_INT,
+		SIR_RESEL_BAD_I_T_L_Q,
+	SCR_JUMP,
+		PADDRH (aborttag),
+}/*-------------------------< BAD_TARGET >-----------------*/,{
+	/*
+	**	We donnot know the target that reselected us.
+	**	Grab the first message if any (IDENTIFY).
+	**	Signal problem to C code for logging the event.
+	**	TARGET_RESET message.
+	*/
+	SCR_INT,
+		SIR_RESEL_BAD_TARGET,
+	SCR_JUMPR ^ IFFALSE (WHEN (SCR_MSG_IN)),
+		8,
+	SCR_MOVE_ABS (1) ^ SCR_MSG_IN,
+		NADDR (msgin),
+	SCR_JUMP,
+		PADDRH (reset),
+}/*-------------------------< BAD_STATUS >-----------------*/,{
+	/*
+	**	If command resulted in either QUEUE FULL,
+	**	CHECK CONDITION or COMMAND TERMINATED,
+	**	call the C code.
+	*/
+	SCR_INT ^ IFTRUE (DATA (S_QUEUE_FULL)),
+		SIR_BAD_STATUS,
+	SCR_INT ^ IFTRUE (DATA (S_CHECK_COND)),
+		SIR_BAD_STATUS,
+	SCR_INT ^ IFTRUE (DATA (S_TERMINATED)),
+		SIR_BAD_STATUS,
+	SCR_RETURN,
+		0,
+}/*-------------------------< START_RAM >-------------------*/,{
+	/*
+	**	Load the script into on-chip RAM, 
+	**	and jump to start point.
+	*/
+	SCR_COPY_F (4),
+		RADDR (scratcha),
+		PADDRH (start_ram0),
+	/*
+	**	Flush script prefetch if required
+	*/
+	PREFETCH_FLUSH
+	SCR_COPY (sizeof (struct script)),
+}/*-------------------------< START_RAM0 >--------------------*/,{
+		0,
+		PADDR (start),
+	SCR_JUMP,
+		PADDR (start),
+}/*-------------------------< STO_RESTART >-------------------*/,{
+	/*
+	**
+	**	Repair start queue (e.g. next time use the next slot) 
+	**	and jump to start point.
+	*/
+	SCR_COPY (4),
+		RADDR (temp),
+		PADDR (startpos),
+	SCR_JUMP,
+		PADDR (start),
+}/*-------------------------< WAIT_DMA >-------------------*/,{
+	/*
+	**	For HP Zalon/53c720 systems, the Zalon interface
+	**	between CPU and 53c720 does prefetches, which causes
+	**	problems with self modifying scripts.  The problem
+	**	is overcome by calling a dummy subroutine after each
+	**	modification, to force a refetch of the script on
+	**	return from the subroutine.
+	*/
+	SCR_RETURN,
+		0,
+}/*-------------------------< SNOOPTEST >-------------------*/,{
+	/*
+	**	Read the variable.
+	*/
+	SCR_COPY (4),
+		NADDR(ncr_cache),
+		RADDR (scratcha),
+	/*
+	**	Write the variable.
+	*/
+	SCR_COPY (4),
+		RADDR (temp),
+		NADDR(ncr_cache),
+	/*
+	**	Read back the variable.
+	*/
+	SCR_COPY (4),
+		NADDR(ncr_cache),
+		RADDR (temp),
+}/*-------------------------< 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 = scrh->tryloop;
+	for (i=0; i<MAX_START; i++) {
+		*p++ =SCR_CALL;
+		*p++ =PADDR (idle);
+	}
+
+	BUG_ON((u_long)p != (u_long)&scrh->tryloop + sizeof (scrh->tryloop));
+
+#ifdef SCSI_NCR_CCB_DONE_SUPPORT
+
+	p = scrh->done_queue;
+	for (i = 0; i<MAX_DONE; i++) {
+		*p++ =SCR_COPY (sizeof(struct ccb *));
+		*p++ =NADDR (header.cp);
+		*p++ =NADDR (ccb_done[i]);
+		*p++ =SCR_CALL;
+		*p++ =PADDR (done_end);
+	}
+
+	BUG_ON((u_long)p != (u_long)&scrh->done_queue+sizeof(scrh->done_queue));
+
+#endif /* SCSI_NCR_CCB_DONE_SUPPORT */
+
+	p = scrh->hdata_in;
+	for (i=0; i<MAX_SCATTERH; i++) {
+		*p++ =SCR_CALL ^ IFFALSE (WHEN (SCR_DATA_IN));
+		*p++ =PADDR (dispatch);
+		*p++ =SCR_MOVE_TBL ^ SCR_DATA_IN;
+		*p++ =offsetof (struct dsb, data[i]);
+	}
+
+	BUG_ON((u_long)p != (u_long)&scrh->hdata_in + sizeof (scrh->hdata_in));
+
+	p = scr->data_in;
+	for (i=MAX_SCATTERH; i<MAX_SCATTERH+MAX_SCATTERL; i++) {
+		*p++ =SCR_CALL ^ IFFALSE (WHEN (SCR_DATA_IN));
+		*p++ =PADDR (dispatch);
+		*p++ =SCR_MOVE_TBL ^ SCR_DATA_IN;
+		*p++ =offsetof (struct dsb, data[i]);
+	}
+
+	BUG_ON((u_long)p != (u_long)&scr->data_in + sizeof (scr->data_in));
+
+	p = scrh->hdata_out;
+	for (i=0; i<MAX_SCATTERH; i++) {
+		*p++ =SCR_CALL ^ IFFALSE (WHEN (SCR_DATA_OUT));
+		*p++ =PADDR (dispatch);
+		*p++ =SCR_MOVE_TBL ^ SCR_DATA_OUT;
+		*p++ =offsetof (struct dsb, data[i]);
+	}
+
+	BUG_ON((u_long)p != (u_long)&scrh->hdata_out + sizeof (scrh->hdata_out));
+
+	p = scr->data_out;
+	for (i=MAX_SCATTERH; i<MAX_SCATTERH+MAX_SCATTERL; i++) {
+		*p++ =SCR_CALL ^ IFFALSE (WHEN (SCR_DATA_OUT));
+		*p++ =PADDR (dispatch);
+		*p++ =SCR_MOVE_TBL ^ SCR_DATA_OUT;
+		*p++ =offsetof (struct dsb, data[i]);
+	}
+
+	BUG_ON((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 (struct ncb *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_ERR "%s: ERROR0 IN SCRIPT at %d.\n",
+				ncr_name(np), (int) (src-start-1));
+			mdelay(1000);
+		}
+
+		if (DEBUG_FLAGS & DEBUG_SCRIPT)
+			printk (KERN_DEBUG "%p:  <%x>\n",
+				(src-1), (unsigned)opcode);
+
+		/*
+		**	We don't have to decode ALL commands
+		*/
+		switch (opcode >> 28) {
+
+		case 0xc:
+			/*
+			**	COPY has TWO arguments.
+			*/
+			relocs = 2;
+			tmp1 = src[0];
+#ifdef	RELOC_KVAR
+			if ((tmp1 & RELOC_MASK) == RELOC_KVAR)
+				tmp1 = 0;
+#endif
+			tmp2 = src[1];
+#ifdef	RELOC_KVAR
+			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 (absolute address)
+			*/
+			relocs = 1;
+			break;
+
+		case 0x8:
+			/*
+			**	JUMP / CALL
+			**	don't relocate if relative :-)
+			*/
+			if (opcode & 0x00800000)
+				relocs = 0;
+			else
+				relocs = 1;
+			break;
+
+		case 0x4:
+		case 0x5:
+		case 0x6:
+		case 0x7:
+			relocs = 1;
+			break;
+
+		default:
+			relocs = 0;
+			break;
+		}
+
+		if (relocs) {
+			while (relocs--) {
+				old = *src++;
+
+				switch (old & RELOC_MASK) {
+				case RELOC_REGISTER:
+					new = (old & ~RELOC_MASK) + np->paddr;
+					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:
+					if (((old & ~RELOC_MASK) <
+					     SCRIPT_KVAR_FIRST) ||
+					    ((old & ~RELOC_MASK) >
+					     SCRIPT_KVAR_LAST))
+						panic("ncr KVAR out of range");
+					new = vtophys(script_kvars[old &
+					    ~RELOC_MASK]);
+					break;
+#endif
+				case 0:
+					/* Don't relocate a 0 address. */
+					if (old == 0) {
+						new = old;
+						break;
+					}
+					/* fall through */
+				default:
+					panic("ncr_script_copy_and_bind: weird relocation %x\n", old);
+					break;
+				}
+
+				*dst++ = cpu_to_scr(new);
+			}
+		} else
+			*dst++ = cpu_to_scr(*src++);
+
+	}
+}
+
+/*
+**	Linux host data structure
+*/
+
+struct host_data {
+     struct ncb *ncb;
+};
+
+#define PRINT_ADDR(cmd, arg...) dev_info(&cmd->device->sdev_gendev , ## arg)
+
+static void ncr_print_msg(struct ccb *cp, char *label, u_char *msg)
+{
+	PRINT_ADDR(cp->cmd, "%s: ", label);
+
+	spi_print_msg(msg);
+	printk("\n");
+}
+
+/*==========================================================
+**
+**	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 chips allow burst lengths of 2, 4, 8, 16, 32, 64, 128 
+**	transfers. 32,64,128 are only supported by 875 and 895 chips.
+**	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.  Burst enable is ctest0 for c720
+ */
+#define burst_code(dmode, ctest0) \
+	(ctest0) & 0x80 ? 0 : (((dmode) & 0xc0) >> 6) + 1
+
+/*
+ *	Set initial io register bits from burst code.
+ */
+static inline void ncr_init_burst(struct ncb *np, u_char bc)
+{
+	u_char *be = &np->rv_ctest0;
+	*be		&= ~0x80;
+	np->rv_dmode	&= ~(0x3 << 6);
+	np->rv_ctest5	&= ~0x4;
+
+	if (!bc) {
+		*be		|= 0x80;
+	} else {
+		--bc;
+		np->rv_dmode	|= ((bc & 0x3) << 6);
+		np->rv_ctest5	|= (bc & 0x4);
+	}
+}
+
+static void __init ncr_prepare_setting(struct ncb *np)
+{
+	u_char	burst_max;
+	u_long	period;
+	int i;
+
+	/*
+	**	Save assumed BIOS setting
+	*/
+
+	np->sv_scntl0	= INB(nc_scntl0) & 0x0a;
+	np->sv_scntl3	= INB(nc_scntl3) & 0x07;
+	np->sv_dmode	= INB(nc_dmode)  & 0xce;
+	np->sv_dcntl	= INB(nc_dcntl)  & 0xa8;
+	np->sv_ctest0	= INB(nc_ctest0) & 0x84;
+	np->sv_ctest3	= INB(nc_ctest3) & 0x01;
+	np->sv_ctest4	= INB(nc_ctest4) & 0x80;
+	np->sv_ctest5	= INB(nc_ctest5) & 0x24;
+	np->sv_gpcntl	= INB(nc_gpcntl);
+	np->sv_stest2	= INB(nc_stest2) & 0x20;
+	np->sv_stest4	= INB(nc_stest4);
+
+	/*
+	**	Wide ?
+	*/
+
+	np->maxwide	= (np->features & FE_WIDE)? 1 : 0;
+
+ 	/*
+	 *  Guess the frequency of the chip's clock.
+	 */
+	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).
+	 */
+	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;
+
+	/*
+	 * 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;
+	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;
+
+	/*
+	 * Check against chip SCSI standard support (SCSI-2,ULTRA,ULTRA2).
+	 */
+
+	if	(np->minsync < 25 && !(np->features & FE_ULTRA))
+		np->minsync = 25;
+
+	/*
+	 * 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;
+
+	/*
+	**	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_ctest0	= np->sv_ctest0;
+	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_ctest0);
+#else
+
+	/*
+	**	Select burst length (dwords)
+	*/
+	burst_max	= driver_setup.burst_max;
+	if (burst_max == 255)
+		burst_max = burst_code(np->sv_dmode, np->sv_ctest0);
+	if (burst_max > 7)
+		burst_max = 7;
+	if (burst_max > np->maxburst)
+		burst_max = np->maxburst;
+
+	/*
+	**	Select all supported special features
+	*/
+	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 (np->features & FE_PFEN)
+		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->features & FE_DFS)
+		np->rv_ctest5	|= DFS;		/* Dma Fifo Size */
+	if (np->features & FE_MUX)
+		np->rv_ctest4	|= MUX;		/* Host bus multiplex mode */
+	if (np->features & FE_EA)
+		np->rv_dcntl	|= EA;		/* Enable ACK */
+	if (np->features & FE_EHP)
+		np->rv_ctest0	|= EHP;		/* Even host parity */
+
+	/*
+	**	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  */
+
+	/*
+	**  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) 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_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 (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) &&
+	    !(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.
+	**	Allow to override sync, wide and NOSCAN from 
+	**	boot command line.
+	*/
+	for (i = 0 ; i < MAX_TARGET ; i++) {
+		struct tcb *tp = &np->target[i];
+
+		tp->usrsync = driver_setup.default_sync;
+		tp->usrwide = driver_setup.max_wide;
+		tp->usrtags = MAX_TAGS;
+		tp->period = 0xffff;
+		if (!driver_setup.disconnection)
+			np->target[i].usrflag = UF_NODISC;
+	}
+
+	/*
+	**	Announce all that stuff to user.
+	*/
+
+	printk(KERN_INFO "%s: ID %d, Fast-%d%s%s\n", ncr_name(np),
+		np->myaddr,
+		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->paddr2)
+		printk (KERN_INFO "%s: on-chip RAM at 0x%lx\n",
+			ncr_name(np), np->paddr2);
+}
+
+/*==========================================================
+**
+**
+**	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 kmalloc(GFP_ATOMIC) 
+**	that shall not reenter the driver under any circumstances,
+**	AFAIK.
+**
+**==========================================================
+*/
+static inline void ncr_queue_done_cmd(struct ncb *np, struct 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(struct scsi_cmnd *lcmd)
+{
+	struct scsi_cmnd *cmd;
+
+	while (lcmd) {
+		cmd = lcmd;
+		lcmd = (struct scsi_cmnd *) cmd->host_scribble;
+		cmd->scsi_done(cmd);
+	}
+}
+
+/*==========================================================
+**
+**
+**	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(struct ncb *np, struct ccb *cp, u_char *msgptr)
+{
+	struct tcb *tp = &np->target[cp->target];
+	int msglen = 0;
+	int nego = 0;
+	struct scsi_target *starget = tp->starget;
+
+	/* negotiate wide transfers ?  */
+	if (!tp->widedone) {
+		if (spi_support_wide(starget)) {
+			nego = NS_WIDE;
+		} else
+			tp->widedone=1;
+	}
+
+	/* negotiate synchronous transfers?  */
+	if (!nego && !tp->period) {
+		if (spi_support_sync(starget)) {
+			nego = NS_SYNC;
+		} else {
+			tp->period  =0xffff;
+			dev_info(&starget->dev, "target did not report SYNC.\n");
+		}
+	}
+
+	switch (nego) {
+	case NS_SYNC:
+		msglen += spi_populate_sync_msg(msgptr + msglen,
+				tp->maxoffs ? tp->minsync : 0, tp->maxoffs);
+		break;
+	case NS_WIDE:
+		msglen += spi_populate_width_msg(msgptr + msglen, tp->usrwide);
+		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":"sync_msgout", msgptr);
+		}
+	}
+
+	return msglen;
+}
+
+
+
+/*==========================================================
+**
+**
+**	Start execution of a SCSI command.
+**	This is called from the generic SCSI driver.
+**
+**
+**==========================================================
+*/
+static int ncr_queue_command (struct ncb *np, struct scsi_cmnd *cmd)
+{
+	struct scsi_device *sdev = cmd->device;
+	struct tcb *tp = &np->target[sdev->id];
+	struct lcb *lp = tp->lp[sdev->lun];
+	struct ccb *cp;
+
+	int	segments;
+	u_char	idmsg, *msgptr;
+	u32	msglen;
+	int	direction;
+	u32	lastp, goalp;
+
+	/*---------------------------------------------
+	**
+	**      Some shortcuts ...
+	**
+	**---------------------------------------------
+	*/
+	if ((sdev->id == np->myaddr	  ) ||
+		(sdev->id >= MAX_TARGET) ||
+		(sdev->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, "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->request->timeout >= HZ) {
+		u_long tlimit = jiffies + cmd->request->timeout - HZ;
+		if (time_after(np->settle_time, tlimit))
+			np->settle_time = tlimit;
+	}
+
+	if (np->settle_time || !(cp=ncr_get_ccb (np, cmd))) {
+		insert_into_waiting_list(np, cmd);
+		return(DID_OK);
+	}
+	cp->cmd = cmd;
+
+	/*----------------------------------------------------
+	**
+	**	Build the identify / tag / sdtr message
+	**
+	**----------------------------------------------------
+	*/
+
+	idmsg = IDENTIFY(0, sdev->lun);
+
+	if (cp ->tag != NO_TAG ||
+		(cp != np->ccb && np->disc && !(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 && time_after(jiffies, lp->tags_stime)) {
+			if (lp->tags_smap) {
+				order = ORDERED_QUEUE_TAG;
+				if ((DEBUG_FLAGS & DEBUG_TAGS)||bootverbose>2){ 
+					PRINT_ADDR(cmd,
+						"ordered tag forced.\n");
+				}
+			}
+			lp->tags_stime = jiffies + 3*HZ;
+			lp->tags_smap = lp->tags_umap;
+		}
+
+		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 = SIMPLE_QUEUE_TAG;
+				break;
+			default:
+				order = ORDERED_QUEUE_TAG;
+			}
+		}
+		msgptr[msglen++] = order;
+		/*
+		**	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.
+		*/
+		msgptr[msglen++] = (cp->tag << 1) + 1;
+	}
+
+	/*----------------------------------------------------
+	**
+	**	Build the data descriptors
+	**
+	**----------------------------------------------------
+	*/
+
+	direction = cmd->sc_data_direction;
+	if (direction != DMA_NONE) {
+		segments = ncr_scatter(np, cp, cp->cmd);
+		if (segments < 0) {
+			ncr_free_ccb(np, cp);
+			return(DID_ERROR);
+		}
+	}
+	else {
+		cp->data_len = 0;
+		segments = 0;
+	}
+
+	/*---------------------------------------------------
+	**
+	**	negotiation required?
+	**
+	**	(nego_status is filled by ncr_prepare_nego())
+	**
+	**---------------------------------------------------
+	*/
+
+	cp->nego_status = 0;
+
+	if ((!tp->widedone || !tp->period) && !tp->nego_cp && lp) {
+		msglen += ncr_prepare_nego (np, cp, msgptr + msglen);
+	}
+
+	/*----------------------------------------------------
+	**
+	**	Determine xfer direction.
+	**
+	**----------------------------------------------------
+	*/
+	if (!cp->data_len)
+		direction = DMA_NONE;
+
+	/*
+	**	If data direction is BIDIRECTIONAL, speculate FROM_DEVICE
+	**	but prepare alternate pointers for TO_DEVICE in case 
+	**	of our speculation will be just wrong.
+	**	SCRIPTS will swap values if needed.
+	*/
+	switch(direction) {
+	case DMA_BIDIRECTIONAL:
+	case DMA_TO_DEVICE:
+		goalp = NCB_SCRIPT_PHYS (np, data_out2) + 8;
+		if (segments <= MAX_SCATTERL)
+			lastp = goalp - 8 - (segments * 16);
+		else {
+			lastp = NCB_SCRIPTH_PHYS (np, hdata_out2);
+			lastp -= (segments - MAX_SCATTERL) * 16;
+		}
+		if (direction != DMA_BIDIRECTIONAL)
+			break;
+		cp->phys.header.wgoalp	= cpu_to_scr(goalp);
+		cp->phys.header.wlastp	= cpu_to_scr(lastp);
+		/* fall through */
+	case DMA_FROM_DEVICE:
+		goalp = NCB_SCRIPT_PHYS (np, data_in2) + 8;
+		if (segments <= MAX_SCATTERL)
+			lastp = goalp - 8 - (segments * 16);
+		else {
+			lastp = NCB_SCRIPTH_PHYS (np, hdata_in2);
+			lastp -= (segments - MAX_SCATTERL) * 16;
+		}
+		break;
+	default:
+	case DMA_NONE:
+		lastp = goalp = NCB_SCRIPT_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 == DMA_BIDIRECTIONAL)
+		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.
+	*/
+	cp->startp = cp->phys.header.savep;
+
+	/*----------------------------------------------------
+	**
+	**	fill in ccb
+	**
+	**----------------------------------------------------
+	**
+	**
+	**	physical -> virtual backlink
+	**	Generic SCSI command
+	*/
+
+	/*
+	**	Startqueue
+	*/
+	cp->start.schedule.l_paddr   = cpu_to_scr(NCB_SCRIPT_PHYS (np, select));
+	cp->restart.schedule.l_paddr = cpu_to_scr(NCB_SCRIPT_PHYS (np, resel_dsa));
+	/*
+	**	select
+	*/
+	cp->phys.select.sel_id		= sdev_id(sdev);
+	cp->phys.select.sel_scntl3	= tp->wval;
+	cp->phys.select.sel_sxfer	= tp->sval;
+	/*
+	**	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_t(int, 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		= 0;
+	cp->host_status			= cp->nego_status ? HS_NEGOTIATE : HS_BUSY;
+	cp->scsi_status			= S_ILLEGAL;
+	cp->parity_status		= 0;
+
+	cp->xerr_status			= XE_OK;
+#if 0
+	cp->sync_status			= tp->sval;
+	cp->wide_status			= tp->wval;
+#endif
+
+	/*----------------------------------------------------
+	**
+	**	Critical region: start this job.
+	**
+	**----------------------------------------------------
+	*/
+
+	/* activate this job.  */
+	cp->magic		= CCB_MAGIC;
+
+	/*
+	**	insert next CCBs into start queue.
+	**	2 max at a time is enough to flush the CCB wait queue.
+	*/
+	cp->auto_sense = 0;
+	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(struct ncb *np, struct lcb *lp, int maxn)
+{
+	struct list_head *qp;
+	struct ccb *cp;
+
+	if (lp->held_ccb)
+		return;
+
+	while (maxn-- && lp->queuedccbs < lp->queuedepth) {
+		qp = ncr_list_pop(&lp->wait_ccbq);
+		if (!qp)
+			break;
+		++lp->queuedccbs;
+		cp = list_entry(qp, struct ccb, link_ccbq);
+		list_add_tail(qp, &lp->busy_ccbq);
+		lp->jump_ccb[cp->tag == NO_TAG ? 0 : cp->tag] =
+			cpu_to_scr(CCB_PHYS (cp, restart));
+		ncr_put_start_queue(np, cp);
+	}
+}
+
+static void ncr_put_start_queue(struct ncb *np, struct ccb *cp)
+{
+	u16	qidx;
+
+	/*
+	**	insert into start queue.
+	*/
+	if (!np->squeueput) np->squeueput = 1;
+	qidx = np->squeueput + 2;
+	if (qidx >= MAX_START + MAX_START) qidx = 1;
+
+	np->scripth->tryloop [qidx] = cpu_to_scr(NCB_SCRIPT_PHYS (np, idle));
+	MEMORY_BARRIER();
+	np->scripth->tryloop [np->squeueput] = cpu_to_scr(CCB_PHYS (cp, start));
+
+	np->squeueput = qidx;
+	++np->queuedccbs;
+	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);
+}
+
+
+static int ncr_reset_scsi_bus(struct ncb *np, int enab_int, int settle_delay)
+{
+	u32 term;
+	int retv = 0;
+
+	np->settle_time	= jiffies + settle_delay * HZ;
+
+	if (bootverbose > 1)
+		printk("%s: resetting, "
+			"command processing suspended for %d seconds\n",
+			ncr_name(np), settle_delay);
+
+	ncr_chip_reset(np, 100);
+	udelay(2000);	/* The 895 needs 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_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;
+}
+
+/*
+ * Start reset process.
+ * If reset in progress do nothing.
+ * 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(struct ncb *np)
+{
+	if (!np->settle_time) {
+		ncr_reset_scsi_bus(np, 1, driver_setup.settle_delay);
+ 	}
+}
+ 
+/*==========================================================
+**
+**
+**	Reset the SCSI BUS.
+**	This is called from the generic SCSI driver.
+**
+**
+**==========================================================
+*/
+static int ncr_reset_bus (struct ncb *np, struct scsi_cmnd *cmd, int sync_reset)
+{
+/*	struct scsi_device        *device    = cmd->device; */
+	struct ccb *cp;
+	int found;
+
+/*
+ * Return immediately if reset is in progress.
+ */
+	if (np->settle_time) {
+		return FAILED;
+	}
+/*
+ * 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->ccb; 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)) {
+		cmd->result = ScsiResult(DID_RESET, 0);
+		ncr_queue_done_cmd(np, cmd);
+	}
+
+	return SUCCESS;
+}
+
+#if 0 /* unused and broken.. */
+/*==========================================================
+**
+**
+**	Abort an SCSI command.
+**	This is called from the generic SCSI driver.
+**
+**
+**==========================================================
+*/
+static int ncr_abort_command (struct ncb *np, struct scsi_cmnd *cmd)
+{
+/*	struct scsi_device        *device    = cmd->device; */
+	struct ccb *cp;
+	int found;
+	int retv;
+
+/*
+ * First, look for the scsi command in the waiting list
+ */
+	if (remove_from_waiting_list(np, cmd)) {
+		cmd->result = ScsiResult(DID_ABORT, 0);
+		ncr_queue_done_cmd(np, cmd);
+		return SCSI_ABORT_SUCCESS;
+	}
+
+/*
+ * Then, look in the wakeup list
+ */
+	for (found=0, cp=np->ccb; 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;
+		}
+	}
+
+	if (!found) {
+		return SCSI_ABORT_NOT_RUNNING;
+	}
+
+	if (np->settle_time) {
+		return SCSI_ABORT_SNOOZE;
+	}
+
+	/*
+	**	If the CCB is active, patch schedule jumps for the 
+	**	script to abort the command.
+	*/
+
+	switch(cp->host_status) {
+	case HS_BUSY:
+	case HS_NEGOTIATE:
+		printk ("%s: abort ccb=%p (cancel)\n", ncr_name (np), cp);
+			cp->start.schedule.l_paddr =
+				cpu_to_scr(NCB_SCRIPTH_PHYS (np, cancel));
+		retv = SCSI_ABORT_PENDING;
+		break;
+	case HS_DISCONNECT:
+		cp->restart.schedule.l_paddr =
+				cpu_to_scr(NCB_SCRIPTH_PHYS (np, abort));
+		retv = SCSI_ABORT_PENDING;
+		break;
+	default:
+		retv = SCSI_ABORT_NOT_RUNNING;
+		break;
+
+	}
+
+	/*
+	**      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);
+
+	return retv;
+}
+#endif
+
+static void ncr_detach(struct ncb *np)
+{
+	struct ccb *cp;
+	struct tcb *tp;
+	struct lcb *lp;
+	int target, lun;
+	int i;
+	char inst_name[16];
+
+	/* Local copy so we don't access np after freeing it! */
+	strlcpy(inst_name, ncr_name(np), sizeof(inst_name));
+
+	printk("%s: releasing host resources\n", ncr_name(np));
+
+/*
+**	Stop the ncr_timeout process
+**	Set release_stage to 1 and wait that ncr_timeout() set it to 2.
+*/
+
+#ifdef DEBUG_NCR53C8XX
+	printk("%s: stopping the timer\n", ncr_name(np));
+#endif
+	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;
+
+/*
+**	Disable chip interrupts
+*/
+
+#ifdef DEBUG_NCR53C8XX
+	printk("%s: disabling chip interrupts\n", ncr_name(np));
+#endif
+	OUTW (nc_sien , 0);
+	OUTB (nc_dien , 0);
+
+	/*
+	**	Reset NCR chip
+	**	Restore bios setting for automatic clock detection.
+	*/
+
+	printk("%s: resetting chip\n", ncr_name(np));
+	ncr_chip_reset(np, 100);
+
+	OUTB(nc_dmode,	np->sv_dmode);
+	OUTB(nc_dcntl,	np->sv_dcntl);
+	OUTB(nc_ctest0,	np->sv_ctest0);
+	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 allocated ccb(s)
+	*/
+
+	while ((cp=np->ccb->link_ccb) != NULL) {
+		np->ccb->link_ccb = cp->link_ccb;
+		if (cp->host_status) {
+		printk("%s: shall free an active ccb (host_status=%d)\n",
+			ncr_name(np), cp->host_status);
+		}
+#ifdef DEBUG_NCR53C8XX
+	printk("%s: freeing ccb (%lx)\n", ncr_name(np), (u_long) cp);
+#endif
+		m_free_dma(cp, sizeof(*cp), "CCB");
+	}
+
+	/* Free allocated tp(s) */
+
+	for (target = 0; target < MAX_TARGET ; target++) {
+		tp=&np->target[target];
+		for (lun = 0 ; lun < MAX_LUN ; lun++) {
+			lp = tp->lp[lun];
+			if (lp) {
+#ifdef DEBUG_NCR53C8XX
+	printk("%s: freeing lp (%lx)\n", ncr_name(np), (u_long) lp);
+#endif
+				if (lp->jump_ccb != &lp->jump_ccb_0)
+					m_free_dma(lp->jump_ccb,256,"JUMP_CCB");
+				m_free_dma(lp, sizeof(*lp), "LCB");
+			}
+		}
+	}
+
+	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->ccb)
+		m_free_dma(np->ccb, sizeof(struct ccb), "CCB");
+	m_free_dma(np, sizeof(struct ncb), "NCB");
+
+	printk("%s: host resources successfully released\n", inst_name);
+}
+
+/*==========================================================
+**
+**
+**	Complete execution of a SCSI command.
+**	Signal completion to the generic SCSI driver.
+**
+**
+**==========================================================
+*/
+
+void ncr_complete (struct ncb *np, struct ccb *cp)
+{
+	struct scsi_cmnd *cmd;
+	struct tcb *tp;
+	struct lcb *lp;
+
+	/*
+	**	Sanity check
+	*/
+
+	if (!cp || cp->magic != CCB_MAGIC || !cp->cmd)
+		return;
+
+	/*
+	**	Print minimal debug information.
+	*/
+
+	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[cmd->device->id];
+	lp = tp->lp[cmd->device->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 = NULL;
+
+	/*
+	**	If auto-sense performed, change scsi status.
+	*/
+	if (cp->auto_sense) {
+		cp->scsi_status = cp->auto_sense;
+	}
+
+	/*
+	**	If we were recovering from queue full or performing 
+	**	auto-sense, requeue skipped CCBs to the wait queue.
+	*/
+
+	if (lp && lp->held_ccb) {
+		if (cp == lp->held_ccb) {
+			list_splice_init(&lp->skip_ccbq, &lp->wait_ccbq);
+			lp->held_ccb = NULL;
+		}
+	}
+
+	/*
+	**	Check for parity errors.
+	*/
+
+	if (cp->parity_status > 1) {
+		PRINT_ADDR(cmd, "%d parity error(s).\n",cp->parity_status);
+	}
+
+	/*
+	**	Check for extended errors.
+	*/
+
+	if (cp->xerr_status != XE_OK) {
+		switch (cp->xerr_status) {
+		case XE_EXTRA_DATA:
+			PRINT_ADDR(cmd, "extraneous data discarded.\n");
+			break;
+		case XE_BAD_PHASE:
+			PRINT_ADDR(cmd, "invalid scsi phase (4/5).\n");
+			break;
+		default:
+			PRINT_ADDR(cmd, "extended error %d.\n",
+					cp->xerr_status);
+			break;
+		}
+		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) {
+			PRINT_ADDR(cmd, "ERROR: cmd=%x host_status=%x "
+					"scsi_status=%x\n", cmd->cmnd[0],
+					cp->host_status, cp->scsi_status);
+		}
+	}
+
+	/*
+	**	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.
+		 */
+		cmd->result = ScsiResult(DID_OK, cp->scsi_status);
+
+		/*
+		**	@RESID@
+		**	Could dig out the correct value for resid,
+		**	but it would be quite complicated.
+		*/
+		/* if (cp->phys.header.lastp != cp->phys.header.goalp) */
+
+		/*
+		**	Allocate the lcb if not yet.
+		*/
+		if (!lp)
+			ncr_alloc_lcb (np, cmd->device->id, cmd->device->lun);
+
+		tp->bytes     += cp->data_len;
+		tp->transfers ++;
+
+		/*
+		**	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, cmd->device);
+			}
+		}
+	} else if ((cp->host_status == HS_COMPLETE)
+		&& (cp->scsi_status == S_CHECK_COND)) {
+		/*
+		**   Check condition code
+		*/
+		cmd->result = ScsiResult(DID_OK, S_CHECK_COND);
+
+		/*
+		**	Copy back sense data to caller's buffer.
+		*/
+		memcpy(cmd->sense_buffer, cp->sense_buf,
+		       min_t(size_t, SCSI_SENSE_BUFFERSIZE,
+			     sizeof(cp->sense_buf)));
+
+		if (DEBUG_FLAGS & (DEBUG_RESULT|DEBUG_TINY)) {
+			u_char *p = cmd->sense_buffer;
+			int i;
+			PRINT_ADDR(cmd, "sense data:");
+			for (i=0; i<14; i++) printk (" %x", *p++);
+			printk (".\n");
+		}
+	} else if ((cp->host_status == HS_COMPLETE)
+		&& (cp->scsi_status == S_CONFLICT)) {
+		/*
+		**   Reservation Conflict condition code
+		*/
+		cmd->result = ScsiResult(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.
+		*/
+		cmd->result = ScsiResult(DID_OK, cp->scsi_status);
+
+	} else if ((cp->host_status == HS_SEL_TIMEOUT)
+		|| (cp->host_status == HS_TIMEOUT)) {
+
+		/*
+		**   No response
+		*/
+		cmd->result = ScsiResult(DID_TIME_OUT, cp->scsi_status);
+
+	} else if (cp->host_status == HS_RESET) {
+
+		/*
+		**   SCSI bus reset
+		*/
+		cmd->result = ScsiResult(DID_RESET, cp->scsi_status);
+
+	} else if (cp->host_status == HS_ABORTED) {
+
+		/*
+		**   Transfer aborted
+		*/
+		cmd->result = ScsiResult(DID_ABORT, cp->scsi_status);
+
+	} else {
+
+		/*
+		**  Other protocol messes
+		*/
+		PRINT_ADDR(cmd, "COMMAND FAILED (%x %x) @%p.\n",
+			cp->host_status, cp->scsi_status, cp);
+
+		cmd->result = ScsiResult(DID_ERROR, cp->scsi_status);
+	}
+
+	/*
+	**	trace output
+	*/
+
+	if (tp->usrflag & UF_TRACE) {
+		u_char * p;
+		int i;
+		PRINT_ADDR(cmd, " CMD:");
+		p = (u_char*) &cmd->cmnd[0];
+		for (i=0; i<cmd->cmd_len; i++) printk (" %x", *p++);
+
+		if (cp->host_status==HS_COMPLETE) {
+			switch (cp->scsi_status) {
+			case S_GOOD:
+				printk ("  GOOD");
+				break;
+			case S_CHECK_COND:
+				printk ("  SENSE:");
+				p = (u_char*) &cmd->sense_buffer;
+				for (i=0; i<14; i++)
+					printk (" %x", *p++);
+				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 &&
+	    !list_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.
+**
+**
+**==========================================================
+*/
+
+/*
+**	This CCB has been skipped by the NCR.
+**	Queue it in the corresponding unit queue.
+*/
+static void ncr_ccb_skipped(struct ncb *np, struct ccb *cp)
+{
+	struct tcb *tp = &np->target[cp->target];
+	struct lcb *lp = tp->lp[cp->lun];
+
+	if (lp && cp != np->ccb) {
+		cp->host_status &= ~HS_SKIPMASK;
+		cp->start.schedule.l_paddr = 
+			cpu_to_scr(NCB_SCRIPT_PHYS (np, select));
+		list_move_tail(&cp->link_ccbq, &lp->skip_ccbq);
+		if (cp->queued) {
+			--lp->queuedccbs;
+		}
+	}
+	if (cp->queued) {
+		--np->queuedccbs;
+		cp->queued = 0;
+	}
+}
+
+/*
+**	The NCR has completed CCBs.
+**	Look at the DONE QUEUE if enabled, otherwise scan all CCBs
+*/
+void ncr_wakeup_done (struct ncb *np)
+{
+	struct ccb *cp;
+#ifdef SCSI_NCR_CCB_DONE_SUPPORT
+	int i, j;
+
+	i = np->ccb_done_ic;
+	while (1) {
+		j = i+1;
+		if (j >= MAX_DONE)
+			j = 0;
+
+		cp = np->ccb_done[j];
+		if (!CCB_DONE_VALID(cp))
+			break;
+
+		np->ccb_done[j] = (struct ccb *)CCB_DONE_EMPTY;
+		np->scripth->done_queue[5*j + 4] =
+				cpu_to_scr(NCB_SCRIPT_PHYS (np, done_plug));
+		MEMORY_BARRIER();
+		np->scripth->done_queue[5*i + 4] =
+				cpu_to_scr(NCB_SCRIPT_PHYS (np, done_end));
+
+		if (cp->host_status & HS_DONEMASK)
+			ncr_complete (np, cp);
+		else if (cp->host_status & HS_SKIPMASK)
+			ncr_ccb_skipped (np, cp);
+
+		i = j;
+	}
+	np->ccb_done_ic = i;
+#else
+	cp = np->ccb;
+	while (cp) {
+		if (cp->host_status & HS_DONEMASK)
+			ncr_complete (np, cp);
+		else if (cp->host_status & HS_SKIPMASK)
+			ncr_ccb_skipped (np, cp);
+		cp = cp->link_ccb;
+	}
+#endif
+}
+
+/*
+**	Complete all active CCBs.
+*/
+void ncr_wakeup (struct ncb *np, u_long code)
+{
+	struct ccb *cp = np->ccb;
+
+	while (cp) {
+		if (cp->host_status != HS_IDLE) {
+			cp->host_status = code;
+			ncr_complete (np, cp);
+		}
+		cp = cp->link_ccb;
+	}
+}
+
+/*
+** Reset ncr chip.
+*/
+
+/* Some initialisation must be done immediately following reset, for 53c720,
+ * at least.  EA (dcntl bit 5) isn't set here as it is set once only in
+ * the _detect function.
+ */
+static void ncr_chip_reset(struct ncb *np, int delay)
+{
+	OUTB (nc_istat,  SRST);
+	udelay(delay);
+	OUTB (nc_istat,  0   );
+
+	if (np->features & FE_EHP)
+		OUTB (nc_ctest0, EHP);
+	if (np->features & FE_MUX)
+		OUTB (nc_ctest4, MUX);
+}
+
+
+/*==========================================================
+**
+**
+**	Start NCR chip.
+**
+**
+**==========================================================
+*/
+
+void ncr_init (struct ncb *np, int reset, char * msg, u_long code)
+{
+ 	int	i;
+
+ 	/*
+	**	Reset chip if asked, otherwise just clear fifos.
+ 	*/
+
+	if (reset) {
+		OUTB (nc_istat,  SRST);
+		udelay(100);
+	}
+	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
+	*/
+	np->queuedepth = MAX_START - 1;	/* 1 entry needed as end marker */
+	for (i = 1; i < MAX_START + MAX_START; i += 2)
+		np->scripth0->tryloop[i] =
+				cpu_to_scr(NCB_SCRIPT_PHYS (np, idle));
+
+	/*
+	**	Start at first entry.
+	*/
+	np->squeueput = 0;
+	np->script0->startpos[0] = cpu_to_scr(NCB_SCRIPTH_PHYS (np, tryloop));
+
+#ifdef SCSI_NCR_CCB_DONE_SUPPORT
+	/*
+	**	Clear Done Queue
+	*/
+	for (i = 0; i < MAX_DONE; i++) {
+		np->ccb_done[i] = (struct ccb *)CCB_DONE_EMPTY;
+		np->scripth0->done_queue[5*i + 4] =
+			cpu_to_scr(NCB_SCRIPT_PHYS (np, done_end));
+	}
+#endif
+
+	/*
+	**	Start at first entry.
+	*/
+	np->script0->done_pos[0] = cpu_to_scr(NCB_SCRIPTH_PHYS (np,done_queue));
+	np->ccb_done_ic = MAX_DONE-1;
+	np->scripth0->done_queue[5*(MAX_DONE-1) + 4] =
+			cpu_to_scr(NCB_SCRIPT_PHYS (np, done_plug));
+
+	/*
+	**	Wakeup all pending jobs.
+	*/
+	ncr_wakeup (np, code);
+
+	/*
+	**	Init chip.
+	*/
+
+	/*
+	** Remove reset; big delay because the 895 needs time for the
+	** bus mode to settle
+	*/
+	ncr_chip_reset(np, 2000);
+
+	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_ctest0, np->rv_ctest0);	/* 720: CDIS and EHP */
+	OUTB (nc_ctest3, np->rv_ctest3);	/* Write and invalidate */
+	OUTB (nc_ctest4, np->rv_ctest4);	/* Master parity checking */
+
+	OUTB (nc_stest2, EXT|np->rv_stest2);	/* Extended Sreq/Sack filtering */
+	OUTB (nc_stest3, TE);			/* TolerANT enable */
+	OUTB (nc_stime0, 0x0c	);		/* HTH disabled  STO 0.25 sec */
+
+	/*
+	**	Disable disconnects.
+	*/
+
+	np->disc = 0;
+
+	/*
+	**    Enable GPIO0 pin for writing if LED support.
+	*/
+
+	if (np->features & FE_LED0) {
+		OUTOFFB (nc_gpcntl, 0x01);
+	}
+
+	/*
+	**      enable ints
+	*/
+
+	OUTW (nc_sien , STO|HTH|MA|SGE|UDC|RST|PAR);
+	OUTB (nc_dien , MDPE|BF|ABRT|SSI|SIR|IID);
+
+	/*
+	**	Fill in target structure.
+	**	Reinitialize usrsync.
+	**	Reinitialize usrwide.
+	**	Prepare sync negotiation according to actual SCSI bus mode.
+	*/
+
+	for (i=0;i<MAX_TARGET;i++) {
+		struct tcb *tp = &np->target[i];
+
+		tp->sval    = 0;
+		tp->wval    = np->rv_scntl3;
+
+		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;
+
+	}
+
+	/*
+	**    Start script processor.
+	*/
+	if (np->paddr2) {
+		if (bootverbose)
+			printk ("%s: Downloading SCSI SCRIPTS.\n",
+				ncr_name(np));
+		OUTL (nc_scratcha, vtobus(np->script0));
+		OUTL_DSP (NCB_SCRIPTH_PHYS (np, start_ram));
+	}
+	else
+		OUTL_DSP (NCB_SCRIPT_PHYS (np, start));
+}
+
+/*==========================================================
+**
+**	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;
+
+	if (tp->maxoffs > np->maxoffs)
+		tp->maxoffs = np->maxoffs;
+
+	tp->minsync = minsync;
+	tp->maxoffs = (minsync<255 ? tp->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(struct ncb *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
+	*/
+	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;
+	*scntl3p	= ((div+1) << 4) + (sfac < 25 ? 0x80 : 0);
+}
+
+
+/*==========================================================
+**
+**	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 (struct ncb *np, u_char target)
+{
+	struct ccb *cp;
+	struct tcb *tp = &np->target[target];
+
+	/*
+	**	set actual value and sync_status
+	*/
+	OUTB (nc_sxfer, tp->sval);
+	np->sync_st = tp->sval;
+	OUTB (nc_scntl3, tp->wval);
+	np->wide_st = tp->wval;
+
+	/*
+	**	patch ALL ccbs of this target.
+	*/
+	for (cp = np->ccb; cp; cp = cp->link_ccb) {
+		if (!cp->cmd) continue;
+		if (scmd_id(cp->cmd) != target) continue;
+#if 0
+		cp->sync_status = tp->sval;
+		cp->wide_status = tp->wval;
+#endif
+		cp->phys.select.sel_scntl3 = tp->wval;
+		cp->phys.select.sel_sxfer  = tp->sval;
+	}
+}
+
+/*==========================================================
+**
+**	Switch sync mode for current job and it's target
+**
+**==========================================================
+*/
+
+static void ncr_setsync (struct ncb *np, struct ccb *cp, u_char scntl3, u_char sxfer)
+{
+	struct scsi_cmnd *cmd = cp->cmd;
+	struct tcb *tp;
+	u_char target = INB (nc_sdid) & 0x0f;
+	u_char idiv;
+
+	BUG_ON(target != (scmd_id(cmd) & 0xf));
+
+	tp = &np->target[target];
+
+	if (!scntl3 || !(sxfer & 0x1f))
+		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 ((sxfer & 0x1f) && idiv)
+		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)
+		return;
+	tp->sval = sxfer;
+	tp->wval = scntl3;
+
+	if (sxfer & 0x01f) {
+		/* Disable extended Sreq/Sack filtering */
+		if (tp->period <= 2000)
+			OUTOFFB(nc_stest2, EXT);
+	}
+ 
+	spi_display_xfer_agreement(tp->starget);
+
+	/*
+	**	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 (struct ncb *np, struct ccb *cp, u_char wide, u_char ack)
+{
+	struct scsi_cmnd *cmd = cp->cmd;
+	u16 target = INB (nc_sdid) & 0x0f;
+	struct tcb *tp;
+	u_char	scntl3;
+	u_char	sxfer;
+
+	BUG_ON(target != (scmd_id(cmd) & 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) {
+		dev_info(&cmd->device->sdev_target->dev, "WIDE SCSI %sabled.\n",
+				(scntl3 & EWS) ? "en" : "dis");
+	}
+
+	/*
+	**	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 (struct ncb *np, struct scsi_device *sdev)
+{
+	unsigned char tn = sdev->id, ln = sdev->lun;
+	struct tcb *tp = &np->target[tn];
+	struct lcb *lp = tp->lp[ln];
+	u_char   reqtags, maxdepth;
+
+	/*
+	**	Just in case ...
+	*/
+	if ((!tp) || (!lp) || !sdev)
+		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 (sdev->tagged_supported && 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->jump_tag.l_paddr = 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) {
+		if (lp->usetags) {
+			dev_info(&sdev->sdev_gendev,
+				"tagged command queue depth set to %d\n",
+				reqtags);
+		} else {
+			dev_info(&sdev->sdev_gendev,
+					"tagged command queueing disabled\n");
+		}
+	}
+}
+
+/*==========================================================
+**
+**
+**	ncr timeout handler.
+**
+**
+**==========================================================
+**
+**	Misused to keep the driver running when
+**	interrupts are not configured correctly.
+**
+**----------------------------------------------------------
+*/
+
+static void ncr_timeout (struct ncb *np)
+{
+	u_long	thistime = jiffies;
+
+	/*
+	**	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;
+	}
+
+	np->timer.expires = jiffies + SCSI_NCR_TIMER_INTERVAL;
+	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;
+			np->disc	= 1;
+			requeue_waiting_list(np);
+		}
+		return;
+	}
+
+	/*
+	**	Since the generic scsi driver only allows us 0.5 second 
+	**	to perform abort of a command, we must look at ccbs about 
+	**	every 0.25 second.
+	*/
+	if (np->lasttime + 4*HZ < thistime) {
+		/*
+		**	block ncr interrupts
+		*/
+		np->lasttime = thistime;
+	}
+
+#ifdef SCSI_NCR_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_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 16 register of the chip:
+**		r0..rf
+**
+**==========================================================
+*/
+
+static void ncr_log_hard_error(struct ncb *np, u16 sist, u_char dstat)
+{
+	u32	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	= NULL;
+		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<16;i++)
+            printk (" %02x", (unsigned)INB_OFF(i));
+	printk (".\n");
+}
+
+/*============================================================
+**
+**	ncr chip exception handler.
+**
+**============================================================
+**
+**	In normal cases, interrupt conditions occur one at a 
+**	time. The ncr is able to stack in some extra registers 
+**	other interrupts that will occur after the first one.
+**	But, several interrupts may occur at the same time.
+**
+**	We probably should only try to deal with the normal 
+**	case, but it seems that multiple interrupts occur in 
+**	some cases that are not abnormal at all.
+**
+**	The most frequent interrupt condition is Phase Mismatch.
+**	We should want to service this interrupt quickly.
+**	A SCSI parity error may be delivered at the same time.
+**	The SIR interrupt is not very frequent in this driver, 
+**	since the INTFLY is likely used for command completion 
+**	signaling.
+**	The Selection Timeout interrupt may be triggered with 
+**	IID and/or UDC.
+**	The SBMC interrupt (SCSI Bus Mode Change) may probably 
+**	occur at any time.
+**
+**	This handler try to deal as cleverly as possible with all
+**	the above.
+**
+**============================================================
+*/
+
+void ncr_exception (struct ncb *np)
+{
+	u_char	istat, dstat;
+	u16	sist;
+	int	i;
+
+	/*
+	**	interrupt on the fly ?
+	**	Since the global header may be copied back to a CCB 
+	**	using a posted PCI memory write, the last operation on 
+	**	the istat register is a READ in order to flush posted 
+	**	PCI write commands.
+	*/
+	istat = INB (nc_istat);
+	if (istat & INTF) {
+		OUTB (nc_istat, (istat & SIGP) | INTF);
+		istat = INB (nc_istat);
+		if (DEBUG_FLAGS & DEBUG_TINY) printk ("F ");
+		ncr_wakeup_done (np);
+	}
+
+	if (!(istat & (SIP|DIP)))
+		return;
+
+	if (istat & CABRT)
+		OUTB (nc_istat, CABRT);
+
+	/*
+	**	Steinbach's Guideline for Systems Programming:
+	**	Never test for an error condition you don't know how to handle.
+	*/
+
+	sist  = (istat & SIP) ? INW (nc_sist)  : 0;
+	dstat = (istat & DIP) ? INB (nc_dstat) : 0;
+
+	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));
+
+	/*========================================================
+	**	First, interrupts we want to service cleanly.
+	**
+	**	Phase mismatch is the most frequent interrupt, and 
+	**	so we have to service it as quickly and as cleanly 
+	**	as possible.
+	**	Programmed interrupts are rarely used in this driver,
+	**	but we must handle them cleanly anyway.
+	**	We try to deal with PAR and SBMC combined with 
+	**	some other interrupt(s).
+	**=========================================================
+	*/
+
+	if (!(sist  & (STO|GEN|HTH|SGE|UDC|RST)) &&
+	    !(dstat & (MDPE|BF|ABRT|IID))) {
+		if ((sist & SBMC) && ncr_int_sbmc (np))
+			return;
+		if ((sist & PAR)  && ncr_int_par  (np))
+			return;
+		if (sist & MA) {
+			ncr_int_ma (np);
+			return;
+		}
+		if (dstat & SIR) {
+			ncr_int_sir (np);
+			return;
+		}
+		/*
+		**  DEL 397 - 53C875 Rev 3 - Part Number 609-0392410 - ITEM 2.
+		*/
+		if (!(sist & (SBMC|PAR)) && !(dstat & SSI)) {
+			printk(	"%s: unknown interrupt(s) ignored, "
+				"ISTAT=%x DSTAT=%x SIST=%x\n",
+				ncr_name(np), istat, dstat, sist);
+			return;
+		}
+		OUTONB_STD ();
+		return;
+	}
+
+	/*========================================================
+	**	Now, interrupts that need some fixing up.
+	**	Order and multiple interrupts is so less important.
+	**
+	**	If SRST has been asserted, we just reset the chip.
+	**
+	**	Selection is intirely handled by the chip. If the 
+	**	chip says STO, we trust it. Seems some other 
+	**	interrupts may occur at the same time (UDC, IID), so 
+	**	we ignore them. In any case we do enough fix-up 
+	**	in the service routine.
+	**	We just exclude some fatal dma errors.
+	**=========================================================
+	*/
+
+	if (sist & RST) {
+		ncr_init (np, 1, bootverbose ? "scsi reset" : NULL, HS_RESET);
+		return;
+	}
+
+	if ((sist & STO) &&
+		!(dstat & (MDPE|BF|ABRT))) {
+	/*
+	**	DEL 397 - 53C875 Rev 3 - Part Number 609-0392410 - ITEM 1.
+	*/
+		OUTONB (nc_ctest3, CLF);
+
+		ncr_int_sto (np);
+		return;
+	}
+
+	/*=========================================================
+	**	Now, interrupts we are not able to recover cleanly.
+	**	(At least for the moment).
+	**
+	**	Do the register dump.
+	**	Log message for real hard errors.
+	**	Clear all fifos.
+	**	For MDPE, BF, ABORT, IID, SGE and HTH we reset the 
+	**	BUS and the chip.
+	**	We are more soft for UDC.
+	**=========================================================
+	*/
+
+	if (time_after(jiffies, np->regtime)) {
+		np->regtime = jiffies + 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);
+
+	printk ("%s: have to clear fifos.\n", ncr_name (np));
+	OUTB (nc_stest3, TE|CSF);
+	OUTONB (nc_ctest3, CLF);
+
+	if ((sist & (SGE)) ||
+		(dstat & (MDPE|BF|ABRT|IID))) {
+		ncr_start_reset(np);
+		return;
+	}
+
+	if (sist & HTH) {
+		printk ("%s: handshake timeout\n", ncr_name(np));
+		ncr_start_reset(np);
+		return;
+	}
+
+	if (sist & UDC) {
+		printk ("%s: unexpected disconnect\n", ncr_name(np));
+		OUTB (HS_PRT, HS_UNEXPECTED);
+		OUTL_DSP (NCB_SCRIPT_PHYS (np, cleanup));
+		return;
+	}
+
+	/*=========================================================
+	**	We just miss the cause of the interrupt. :(
+	**	Print a message. The timeout will do the real work.
+	**=========================================================
+	*/
+	printk ("%s: unknown interrupt\n", ncr_name(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 (struct ncb *np)
+{
+	u_long dsa;
+	struct ccb *cp;
+	if (DEBUG_FLAGS & DEBUG_TINY) printk ("T");
+
+	/*
+	**	look for ccb and set the status.
+	*/
+
+	dsa = INL (nc_dsa);
+	cp = np->ccb;
+	while (cp && (CCB_PHYS (cp, phys) != dsa))
+		cp = cp->link_ccb;
+
+	if (cp) {
+		cp-> host_status = HS_SEL_TIMEOUT;
+		ncr_complete (np, cp);
+	}
+
+	/*
+	**	repair start queue and jump to start point.
+	*/
+
+	OUTL_DSP (NCB_SCRIPTH_PHYS (np, sto_restart));
+	return;
+}
+
+/*==========================================================
+**
+**	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 int ncr_int_sbmc (struct ncb *np)
+{
+	u_char scsi_mode = INB (nc_stest4) & SMODE;
+
+	if (scsi_mode != np->scsi_mode) {
+		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	= jiffies + HZ;
+		ncr_init (np, 0, bootverbose ? "scsi mode change" : NULL, HS_RESET);
+		return 1;
+	}
+	return 0;
+}
+
+/*==========================================================
+**
+**	ncr chip exception handler for SCSI parity error.
+**
+**==========================================================
+**
+**
+**----------------------------------------------------------
+*/
+
+static int ncr_int_par (struct ncb *np)
+{
+	u_char	hsts	= INB (HS_PRT);
+	u32	dbc	= INL (nc_dbc);
+	u_char	sstat1	= INB (nc_sstat1);
+	int phase	= -1;
+	int msg		= -1;
+	u32 jmp;
+
+	printk("%s: SCSI parity error detected: SCR1=%d DBC=%x SSTAT1=%x\n",
+		ncr_name(np), hsts, dbc, sstat1);
+
+	/*
+	 *	Ignore the interrupt if the NCR is not connected 
+	 *	to the SCSI bus, since the right work should have  
+	 *	been done on unexpected disconnection handling.
+	 */
+	if (!(INB (nc_scntl1) & ISCON))
+		return 0;
+
+	/*
+	 *	If the nexus is not clearly identified, reset the bus.
+	 *	We will try to do better later.
+	 */
+	if (hsts & HS_INVALMASK)
+		goto reset_all;
+
+	/*
+	 *	If the SCSI parity error occurs in MSG IN phase, prepare a 
+	 *	MSG PARITY message. Otherwise, prepare a INITIATOR DETECTED 
+	 *	ERROR message and let the device decide to retry the command 
+	 *	or to terminate with check condition. If we were in MSG IN 
+	 *	phase waiting for the response of a negotiation, we will 
+	 *	get SIR_NEGO_FAILED at dispatch.
+	 */
+	if (!(dbc & 0xc0000000))
+		phase = (dbc >> 24) & 7;
+	if (phase == 7)
+		msg = MSG_PARITY_ERROR;
+	else
+		msg = INITIATOR_ERROR;
+
+
+	/*
+	 *	If the NCR stopped on a MOVE ^ DATA_IN, we jump to a 
+	 *	script that will ignore all data in bytes until phase 
+	 *	change, since we are not sure the chip will wait the phase 
+	 *	change prior to delivering the interrupt.
+	 */
+	if (phase == 1)
+		jmp = NCB_SCRIPTH_PHYS (np, par_err_data_in);
+	else
+		jmp = NCB_SCRIPTH_PHYS (np, par_err_other);
+
+	OUTONB (nc_ctest3, CLF );	/* clear dma fifo  */
+	OUTB (nc_stest3, TE|CSF);	/* clear scsi fifo */
+
+	np->msgout[0] = msg;
+	OUTL_DSP (jmp);
+	return 1;
+
+reset_all:
+	ncr_start_reset(np);
+	return 1;
+}
+
+/*==========================================================
+**
+**
+**	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 (struct ncb *np)
+{
+	u32	dbc;
+	u32	rest;
+	u32	dsp;
+	u32	dsa;
+	u32	nxtdsp;
+	u32	newtmp;
+	u32	*vdsp;
+	u32	oadr, olen;
+	u32	*tblp;
+	ncrcmd *newcmd;
+	u_char	cmd, sbcl;
+	struct ccb *cp;
+
+	dsp	= INL (nc_dsp);
+	dbc	= INL (nc_dbc);
+	sbcl	= INB (nc_sbcl);
+
+	cmd	= dbc >> 24;
+	rest	= dbc & 0xffffff;
+
+	/*
+	**	Take into account dma fifo and various buffers and latches,
+	**	only if the interrupted phase is an OUTPUT phase.
+	*/
+
+	if ((cmd & 1) == 0) {
+		u_char	ctest5, ss0, ss2;
+		u16	delta;
+
+		ctest5 = (np->rv_ctest5 & DFS) ? INB (nc_ctest5) : 0;
+		if (ctest5 & DFS)
+			delta=(((ctest5 << 8) | (INB (nc_dfifo) & 0xff)) - rest) & 0x3ff;
+		else
+			delta=(INB (nc_dfifo) - 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 (ss0 & ORF) rest++;
+		if (INB(nc_scntl3) & EWS) {
+			ss2 = INB (nc_sstat2);
+			if (ss2 & OLF1) rest++;
+			if (ss2 & ORF1) rest++;
+		}
+
+		if (DEBUG_FLAGS & (DEBUG_TINY|DEBUG_PHASE))
+			printk ("P%x%x RL=%d D=%d SS0=%x ", cmd&7, sbcl&7,
+				(unsigned) rest, (unsigned) delta, ss0);
+
+	} else	{
+		if (DEBUG_FLAGS & (DEBUG_TINY|DEBUG_PHASE))
+			printk ("P%x%x RL=%d ", cmd&7, sbcl&7, rest);
+	}
+
+	/*
+	**	Clear fifos.
+	*/
+	OUTONB (nc_ctest3, CLF );	/* clear dma fifo  */
+	OUTB (nc_stest3, TE|CSF);	/* clear scsi fifo */
+
+	/*
+	**	locate matching cp.
+	**	if the interrupted phase is DATA IN or DATA OUT,
+	**	trust the global header.
+	*/
+	dsa = INL (nc_dsa);
+	if (!(cmd & 6)) {
+		cp = np->header.cp;
+		if (CCB_PHYS(cp, phys) != dsa)
+			cp = NULL;
+	} else {
+		cp  = np->ccb;
+		while (cp && (CCB_PHYS (cp, phys) != dsa))
+			cp = cp->link_ccb;
+	}
+
+	/*
+	**	try to find the interrupted script command,
+	**	and the address at which to continue.
+	*/
+	vdsp	= NULL;
+	nxtdsp	= 0;
+	if	(dsp >  np->p_script &&
+		 dsp <= np->p_script + sizeof(struct script)) {
+		vdsp = (u32 *)((char*)np->script0 + (dsp-np->p_script-8));
+		nxtdsp = dsp;
+	}
+	else if	(dsp >  np->p_scripth &&
+		 dsp <= np->p_scripth + sizeof(struct scripth)) {
+		vdsp = (u32 *)((char*)np->scripth0 + (dsp-np->p_scripth-8));
+		nxtdsp = dsp;
+	}
+	else if (cp) {
+		if	(dsp == CCB_PHYS (cp, patch[2])) {
+			vdsp = &cp->patch[0];
+			nxtdsp = scr_to_cpu(vdsp[3]);
+		}
+		else if (dsp == CCB_PHYS (cp, patch[6])) {
+			vdsp = &cp->patch[4];
+			nxtdsp = scr_to_cpu(vdsp[3]);
+		}
+	}
+
+	/*
+	**	log the information
+	*/
+
+	if (DEBUG_FLAGS & DEBUG_PHASE) {
+		printk ("\nCP=%p CP2=%p DSP=%x NXT=%x VDSP=%p CMD=%x ",
+			cp, np->header.cp,
+			(unsigned)dsp,
+			(unsigned)nxtdsp, vdsp, cmd);
+	}
+
+	/*
+	**	cp=0 means that the DSA does not point to a valid control 
+	**	block. This should not happen since we donnot use multi-byte 
+	**	move while we are being reselected ot after command complete.
+	**	We are not able to recover from such a phase error.
+	*/
+	if (!cp) {
+		printk ("%s: SCSI phase error fixup: "
+			"CCB already dequeued (0x%08lx)\n", 
+			ncr_name (np), (u_long) np->header.cp);
+		goto reset_all;
+	}
+
+	/*
+	**	get old startaddress and old length.
+	*/
+
+	oadr = scr_to_cpu(vdsp[1]);
+
+	if (cmd & 0x10) {	/* Table indirect */
+		tblp = (u32 *) ((char*) &cp->phys + oadr);
+		olen = scr_to_cpu(tblp[0]);
+		oadr = scr_to_cpu(tblp[1]);
+	} else {
+		tblp = (u32 *) 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 (cmd != (scr_to_cpu(vdsp[0]) >> 24)) {
+		PRINT_ADDR(cp->cmd, "internal error: cmd=%02x != %02x=(vdsp[0] "
+				">> 24)\n", cmd, scr_to_cpu(vdsp[0]) >> 24);
+
+		goto reset_all;
+	}
+
+	/*
+	**	cp != np->header.cp means that the header of the CCB 
+	**	currently being processed has not yet been copied to 
+	**	the global header area. That may happen if the device did 
+	**	not accept all our messages after having been selected.
+	*/
+	if (cp != np->header.cp) {
+		printk ("%s: SCSI phase error fixup: "
+			"CCB address mismatch (0x%08lx != 0x%08lx)\n", 
+			ncr_name (np), (u_long) cp, (u_long) np->header.cp);
+	}
+
+	/*
+	**	if old phase not dataphase, leave here.
+	*/
+
+	if (cmd & 0x06) {
+		PRINT_ADDR(cp->cmd, "phase change %x-%x %d@%08x resid=%d.\n",
+			cmd&7, sbcl&7, (unsigned)olen,
+			(unsigned)oadr, (unsigned)rest);
+		goto unexpected_phase;
+	}
+
+	/*
+	**	choose the correct patch area.
+	**	if savep points to one, choose the other.
+	*/
+
+	newcmd = cp->patch;
+	newtmp = CCB_PHYS (cp, patch);
+	if (newtmp == scr_to_cpu(cp->phys.header.savep)) {
+		newcmd = &cp->patch[4];
+		newtmp = CCB_PHYS (cp, patch[4]);
+	}
+
+	/*
+	**	fillin the commands
+	*/
+
+	newcmd[0] = cpu_to_scr(((cmd & 0x0f) << 24) | rest);
+	newcmd[1] = cpu_to_scr(oadr + olen - rest);
+	newcmd[2] = cpu_to_scr(SCR_JUMP);
+	newcmd[3] = cpu_to_scr(nxtdsp);
+
+	if (DEBUG_FLAGS & DEBUG_PHASE) {
+		PRINT_ADDR(cp->cmd, "newcmd[%d] %x %x %x %x.\n",
+			(int) (newcmd - cp->patch),
+			(unsigned)scr_to_cpu(newcmd[0]),
+			(unsigned)scr_to_cpu(newcmd[1]),
+			(unsigned)scr_to_cpu(newcmd[2]),
+			(unsigned)scr_to_cpu(newcmd[3]));
+	}
+	/*
+	**	fake the return address (to the patch).
+	**	and restart script processor at dispatcher.
+	*/
+	OUTL (nc_temp, newtmp);
+	OUTL_DSP (NCB_SCRIPT_PHYS (np, dispatch));
+	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 reasonable ? (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 */
+		np->scripth->nxtdsp_go_on[0] = cpu_to_scr(dsp + 8);
+		if	(dsp == NCB_SCRIPT_PHYS (np, send_ident)) {
+			cp->host_status = HS_BUSY;
+			nxtdsp = NCB_SCRIPTH_PHYS (np, clratn_go_on);
+		}
+		else if	(dsp == NCB_SCRIPTH_PHYS (np, send_wdtr) ||
+			 dsp == NCB_SCRIPTH_PHYS (np, send_sdtr)) {
+			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);
+}
+
+
+static void ncr_sir_to_redo(struct ncb *np, int num, struct ccb *cp)
+{
+	struct scsi_cmnd *cmd	= cp->cmd;
+	struct tcb *tp	= &np->target[cmd->device->id];
+	struct lcb *lp	= tp->lp[cmd->device->lun];
+	struct list_head *qp;
+	struct ccb *	cp2;
+	int		disc_cnt = 0;
+	int		busy_cnt = 0;
+	u32		startp;
+	u_char		s_status = INB (SS_PRT);
+
+	/*
+	**	Let the SCRIPTS processor skip all not yet started CCBs,
+	**	and count disconnected CCBs. Since the busy queue is in 
+	**	the same order as the chip start queue, disconnected CCBs 
+	**	are before cp and busy ones after.
+	*/
+	if (lp) {
+		qp = lp->busy_ccbq.prev;
+		while (qp != &lp->busy_ccbq) {
+			cp2 = list_entry(qp, struct ccb, link_ccbq);
+			qp  = qp->prev;
+			++busy_cnt;
+			if (cp2 == cp)
+				break;
+			cp2->start.schedule.l_paddr =
+			cpu_to_scr(NCB_SCRIPTH_PHYS (np, skip));
+		}
+		lp->held_ccb = cp;	/* Requeue when this one completes */
+		disc_cnt = lp->queuedccbs - busy_cnt;
+	}
+
+	switch(s_status) {
+	default:	/* Just for safety, should never happen */
+	case S_QUEUE_FULL:
+		/*
+		**	Decrease number of tags to the number of 
+		**	disconnected commands.
+		*/
+		if (!lp)
+			goto out;
+		if (bootverbose >= 1) {
+			PRINT_ADDR(cmd, "QUEUE FULL! %d busy, %d disconnected "
+					"CCBs\n", busy_cnt, disc_cnt);
+		}
+		if (disc_cnt < lp->numtags) {
+			lp->numtags	= disc_cnt > 2 ? disc_cnt : 2;
+			lp->num_good	= 0;
+			ncr_setup_tags (np, cmd->device);
+		}
+		/*
+		**	Requeue the command to the start queue.
+		**	If any disconnected commands,
+		**		Clear SIGP.
+		**		Jump to reselect.
+		*/
+		cp->phys.header.savep = cp->startp;
+		cp->host_status = HS_BUSY;
+		cp->scsi_status = S_ILLEGAL;
+
+		ncr_put_start_queue(np, cp);
+		if (disc_cnt)
+			INB (nc_ctest2);		/* Clear SIGP */
+		OUTL_DSP (NCB_SCRIPT_PHYS (np, reselect));
+		return;
+	case S_TERMINATED:
+	case S_CHECK_COND:
+		/*
+		**	If we were requesting sense, give up.
+		*/
+		if (cp->auto_sense)
+			goto out;
+
+		/*
+		**	Device returned CHECK CONDITION status.
+		**	Prepare all needed data strutures for getting 
+		**	sense data.
+		**
+		**	identify message
+		*/
+		cp->scsi_smsg2[0]	= IDENTIFY(0, cmd->device->lun);
+		cp->phys.smsg.addr	= cpu_to_scr(CCB_PHYS (cp, scsi_smsg2));
+		cp->phys.smsg.size	= cpu_to_scr(1);
+
+		/*
+		**	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]		= (cmd->device->lun & 0x7) << 5;
+		cp->sensecmd[4]		= sizeof(cp->sense_buf);
+
+		/*
+		**	sense data
+		*/
+		memset(cp->sense_buf, 0, 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 = cpu_to_scr(NCB_SCRIPTH_PHYS (np, sdata_in));
+
+		cp->phys.header.savep	= startp;
+		cp->phys.header.goalp	= startp + 24;
+		cp->phys.header.lastp	= startp;
+		cp->phys.header.wgoalp	= startp + 24;
+		cp->phys.header.wlastp	= startp;
+
+		cp->host_status = HS_BUSY;
+		cp->scsi_status = S_ILLEGAL;
+		cp->auto_sense	= s_status;
+
+		cp->start.schedule.l_paddr =
+			cpu_to_scr(NCB_SCRIPT_PHYS (np, select));
+
+		/*
+		**	Select without ATN for quirky devices.
+		*/
+		if (cmd->device->select_no_atn)
+			cp->start.schedule.l_paddr =
+			cpu_to_scr(NCB_SCRIPTH_PHYS (np, select_no_atn));
+
+		ncr_put_start_queue(np, cp);
+
+		OUTL_DSP (NCB_SCRIPT_PHYS (np, start));
+		return;
+	}
+
+out:
+	OUTONB_STD ();
+	return;
+}
+
+
+/*==========================================================
+**
+**
+**      ncr chip exception handler for programmed interrupts.
+**
+**
+**==========================================================
+*/
+
+void ncr_int_sir (struct ncb *np)
+{
+	u_char scntl3;
+	u_char chg, ofs, per, fak, wide;
+	u_char num = INB (nc_dsps);
+	struct ccb *cp=NULL;
+	u_long	dsa    = INL (nc_dsa);
+	u_char	target = INB (nc_sdid) & 0x0f;
+	struct tcb *tp     = &np->target[target];
+	struct scsi_target *starget = tp->starget;
+
+	if (DEBUG_FLAGS & DEBUG_TINY) printk ("I#%d", num);
+
+	switch (num) {
+	case SIR_INTFLY:
+		/*
+		**	This is used for HP Zalon/53c720 where INTFLY
+		**	operation is currently broken.
+		*/
+		ncr_wakeup_done(np);
+#ifdef SCSI_NCR_CCB_DONE_SUPPORT
+		OUTL(nc_dsp, NCB_SCRIPT_PHYS (np, done_end) + 8);
+#else
+		OUTL(nc_dsp, NCB_SCRIPT_PHYS (np, start));
+#endif
+		return;
+	case SIR_RESEL_NO_MSG_IN:
+	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->lp[0]) { 
+			OUTL_DSP (scr_to_cpu(tp->lp[0]->jump_ccb[0]));
+			return;
+		}
+	case SIR_RESEL_BAD_TARGET:	/* Will send a TARGET RESET message */
+	case SIR_RESEL_BAD_LUN:		/* Will send a TARGET RESET message */
+	case SIR_RESEL_BAD_I_T_L_Q:	/* Will send an ABORT TAG message   */
+	case SIR_RESEL_BAD_I_T_L:	/* Will send an ABORT message	    */
+		printk ("%s:%d: SIR %d, "
+			"incorrect nexus identification on reselection\n",
+			ncr_name (np), target, num);
+		goto out;
+	case SIR_DONE_OVERFLOW:
+		printk ("%s:%d: SIR %d, "
+			"CCB done queue overflow\n",
+			ncr_name (np), target, num);
+		goto out;
+	case SIR_BAD_STATUS:
+		cp = np->header.cp;
+		if (!cp || CCB_PHYS (cp, phys) != dsa)
+			goto out;
+		ncr_sir_to_redo(np, num, cp);
+		return;
+	default:
+		/*
+		**	lookup the ccb
+		*/
+		cp = np->ccb;
+		while (cp && (CCB_PHYS (cp, phys) != dsa))
+			cp = cp->link_ccb;
+
+		BUG_ON(!cp);
+		BUG_ON(cp != np->header.cp);
+
+		if (!cp || cp != np->header.cp)
+			goto out;
+	}
+
+	switch (num) {
+/*-----------------------------------------------------------------------------
+**
+**	Was Sie schon immer ueber transfermode negotiation wissen wollten ...
+**	("Everything you've always wanted to know about transfer mode
+**	  negotiation")
+**
+**	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_FAIL 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.
+**
+**	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.
+**
+**	Possible cases:		   hs  sir   msg_in value  send   goto
+**	We try to negotiate:
+**	-> target doesn't msgin    NEG FAIL  noop   defa.  -      dispatch
+**	-> target rejected our msg NEG FAIL  reject defa.  -      dispatch
+**	-> target answered  (ok)   NEG SYNC  sdtr   set    -      clrack
+**	-> target answered (!ok)   NEG SYNC  sdtr   defa.  REJ--->msg_bad
+**	-> target answered  (ok)   NEG WIDE  wdtr   set    -      clrack
+**	-> target answered (!ok)   NEG WIDE  wdtr   defa.  REJ--->msg_bad
+**	-> any other msgin	   NEG FAIL  noop   defa.  -      dispatch
+**
+**	Target tries to negotiate:
+**	-> incoming message	   --- SYNC  sdtr   set    SDTR   -
+**	-> incoming message	   --- WIDE  wdtr   set    WDTR   -
+**      We sent our answer:
+**	-> target doesn't msgout   --- PROTO ?      defa.  -      dispatch
+**
+**-----------------------------------------------------------------------------
+*/
+
+	case SIR_NEGO_FAILED:
+		/*-------------------------------------------------------
+		**
+		**	Negotiation failed.
+		**	Target doesn't send an answer message,
+		**	or target rejected our message.
+		**
+		**      Remove negotiation request.
+		**
+		**-------------------------------------------------------
+		*/
+		OUTB (HS_PRT, HS_BUSY);
+
+		/* fall through */
+
+	case SIR_NEGO_PROTO:
+		/*-------------------------------------------------------
+		**
+		**	Negotiation failed.
+		**	Target doesn't fetch the answer message.
+		**
+		**-------------------------------------------------------
+		*/
+
+		if (DEBUG_FLAGS & DEBUG_NEGO) {
+			PRINT_ADDR(cp->cmd, "negotiation failed sir=%x "
+					"status=%x.\n", num, cp->nego_status);
+		}
+
+		/*
+		**	any error in negotiation:
+		**	fall back to default mode.
+		*/
+		switch (cp->nego_status) {
+
+		case NS_SYNC:
+			spi_period(starget) = 0;
+			spi_offset(starget) = 0;
+			ncr_setsync (np, cp, 0, 0xe0);
+			break;
+
+		case NS_WIDE:
+			spi_width(starget) = 0;
+			ncr_setwide (np, cp, 0, 0);
+			break;
+
+		}
+		np->msgin [0] = NOP;
+		np->msgout[0] = NOP;
+		cp->nego_status = 0;
+		break;
+
+	case SIR_NEGO_SYNC:
+		if (DEBUG_FLAGS & DEBUG_NEGO) {
+			ncr_print_msg(cp, "sync msgin", np->msgin);
+		}
+
+		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 && starget)
+			spi_support_sync(starget) = 1;
+
+		/*
+		**	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 > tp->maxoffs)
+			{chg = 1; ofs = tp->maxoffs;}
+
+		/*
+		**	Check against controller limits.
+		*/
+		fak	= 7;
+		scntl3	= 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;
+			tp->minsync = 0;
+		}
+
+		if (DEBUG_FLAGS & DEBUG_NEGO) {
+			PRINT_ADDR(cp->cmd, "sync: per=%d scntl3=0x%x ofs=%d "
+				"fak=%d chg=%d.\n", per, scntl3, 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.  */
+					spi_period(starget) = 0;
+					spi_offset(starget) = 0;
+					ncr_setsync(np, cp, 0, 0xe0);
+					OUTL_DSP(NCB_SCRIPT_PHYS (np, msg_bad));
+				} else {
+					/* Answer is ok.  */
+					spi_period(starget) = per;
+					spi_offset(starget) = ofs;
+					ncr_setsync(np, cp, scntl3, (fak<<5)|ofs);
+					OUTL_DSP(NCB_SCRIPT_PHYS (np, clrack));
+				}
+				return;
+
+			case NS_WIDE:
+				spi_width(starget) = 0;
+				ncr_setwide(np, cp, 0, 0);
+				break;
+			}
+		}
+
+		/*
+		**	It was a request. Set value and
+		**      prepare an answer message
+		*/
+
+		spi_period(starget) = per;
+		spi_offset(starget) = ofs;
+		ncr_setsync(np, cp, scntl3, (fak<<5)|ofs);
+
+		spi_populate_sync_msg(np->msgout, per, ofs);
+		cp->nego_status = NS_SYNC;
+
+		if (DEBUG_FLAGS & DEBUG_NEGO) {
+			ncr_print_msg(cp, "sync msgout", np->msgout);
+		}
+
+		if (!ofs) {
+			OUTL_DSP (NCB_SCRIPT_PHYS (np, msg_bad));
+			return;
+		}
+		np->msgin [0] = NOP;
+
+		break;
+
+	case SIR_NEGO_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 && starget)
+			spi_support_wide(starget) = 1;
+
+		/*
+		**	check values against driver limits.
+		*/
+
+		if (wide > tp->usrwide)
+			{chg = 1; wide = tp->usrwide;}
+
+		if (DEBUG_FLAGS & DEBUG_NEGO) {
+			PRINT_ADDR(cp->cmd, "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.  */
+					spi_width(starget) = 0;
+					ncr_setwide(np, cp, 0, 1);
+					OUTL_DSP (NCB_SCRIPT_PHYS (np, msg_bad));
+				} else {
+					/* Answer is ok.  */
+					spi_width(starget) = wide;
+					ncr_setwide(np, cp, wide, 1);
+					OUTL_DSP (NCB_SCRIPT_PHYS (np, clrack));
+				}
+				return;
+
+			case NS_SYNC:
+				spi_period(starget) = 0;
+				spi_offset(starget) = 0;
+				ncr_setsync(np, cp, 0, 0xe0);
+				break;
+			}
+		}
+
+		/*
+		**	It was a request, set value and
+		**      prepare an answer message
+		*/
+
+		spi_width(starget) = wide;
+		ncr_setwide(np, cp, wide, 1);
+		spi_populate_width_msg(np->msgout, wide);
+
+		np->msgin [0] = NOP;
+
+		cp->nego_status = NS_WIDE;
+
+		if (DEBUG_FLAGS & DEBUG_NEGO) {
+			ncr_print_msg(cp, "wide msgout", np->msgin);
+		}
+		break;
+
+/*--------------------------------------------------------------------
+**
+**	Processing of special messages
+**
+**--------------------------------------------------------------------
+*/
+
+	case SIR_REJECT_RECEIVED:
+		/*-----------------------------------------------
+		**
+		**	We received a MESSAGE_REJECT.
+		**
+		**-----------------------------------------------
+		*/
+
+		PRINT_ADDR(cp->cmd, "MESSAGE_REJECT received (%x:%x).\n",
+			(unsigned)scr_to_cpu(np->lastmsg), np->msgout[0]);
+		break;
+
+	case SIR_REJECT_SENT:
+		/*-----------------------------------------------
+		**
+		**	We received an unknown message
+		**
+		**-----------------------------------------------
+		*/
+
+		ncr_print_msg(cp, "MESSAGE_REJECT sent for", np->msgin);
+		break;
+
+/*--------------------------------------------------------------------
+**
+**	Processing of special messages
+**
+**--------------------------------------------------------------------
+*/
+
+	case SIR_IGN_RESIDUE:
+		/*-----------------------------------------------
+		**
+		**	We received an IGNORE RESIDUE message,
+		**	which couldn't be handled by the script.
+		**
+		**-----------------------------------------------
+		*/
+
+		PRINT_ADDR(cp->cmd, "IGNORE_WIDE_RESIDUE received, but not yet "
+				"implemented.\n");
+		break;
+#if 0
+	case SIR_MISSING_SAVE:
+		/*-----------------------------------------------
+		**
+		**	We received an DISCONNECT message,
+		**	but the datapointer wasn't saved before.
+		**
+		**-----------------------------------------------
+		*/
+
+		PRINT_ADDR(cp->cmd, "DISCONNECT received, but datapointer "
+				"not saved: data=%x save=%x goal=%x.\n",
+			(unsigned) INL (nc_temp),
+			(unsigned) scr_to_cpu(np->header.savep),
+			(unsigned) scr_to_cpu(np->header.goalp));
+		break;
+#endif
+	}
+
+out:
+	OUTONB_STD ();
+}
+
+/*==========================================================
+**
+**
+**	Acquire a control block
+**
+**
+**==========================================================
+*/
+
+static struct ccb *ncr_get_ccb(struct ncb *np, struct scsi_cmnd *cmd)
+{
+	u_char tn = cmd->device->id;
+	u_char ln = cmd->device->lun;
+	struct tcb *tp = &np->target[tn];
+	struct lcb *lp = tp->lp[ln];
+	u_char tag = NO_TAG;
+	struct ccb *cp = NULL;
+
+	/*
+	**	Lun structure available ?
+	*/
+	if (lp) {
+		struct list_head *qp;
+		/*
+		**	Keep from using more tags than we can handle.
+		*/
+		if (lp->usetags && lp->busyccbs >= lp->maxnxs)
+			return NULL;
+
+		/*
+		**	Allocate a new CCB if needed.
+		*/
+		if (list_empty(&lp->free_ccbq))
+			ncr_alloc_ccb(np, tn, ln);
+
+		/*
+		**	Look for free CCB
+		*/
+		qp = ncr_list_pop(&lp->free_ccbq);
+		if (qp) {
+			cp = list_entry(qp, struct ccb, link_ccbq);
+			if (cp->magic) {
+				PRINT_ADDR(cmd, "ccb free list corrupted "
+						"(@%p)\n", cp);
+				cp = NULL;
+			} else {
+				list_add_tail(qp, &lp->wait_ccbq);
+				++lp->busyccbs;
+			}
+		}
+
+		/*
+		**	If a CCB is available,
+		**	Get a tag for this nexus if required.
+		*/
+		if (cp) {
+			if (lp->usetags)
+				tag = lp->cb_tags[lp->ia_tag];
+		}
+		else if (lp->actccbs > 0)
+			return NULL;
+	}
+
+	/*
+	**	if nothing available, take the default.
+	*/
+	if (!cp)
+		cp = np->ccb;
+
+	/*
+	**	Wait until available.
+	*/
+#if 0
+	while (cp->magic) {
+		if (flags & SCSI_NOSLEEP) break;
+		if (tsleep ((caddr_t)cp, PRIBIO|PCATCH, "ncr", 0))
+			break;
+	}
+#endif
+
+	if (cp->magic)
+		return NULL;
+
+	cp->magic = 1;
+
+	/*
+	**	Move to next available tag if tag used.
+	*/
+	if (lp) {
+		if (tag != NO_TAG) {
+			++lp->ia_tag;
+			if (lp->ia_tag == MAX_TAGS)
+				lp->ia_tag = 0;
+			lp->tags_umap |= (((tagmap_t) 1) << tag);
+		}
+	}
+
+	/*
+	**	Remember all informations needed to free this CCB.
+	*/
+	cp->tag	   = tag;
+	cp->target = tn;
+	cp->lun    = ln;
+
+	if (DEBUG_FLAGS & DEBUG_TAGS) {
+		PRINT_ADDR(cmd, "ccb @%p using tag %d.\n", cp, tag);
+	}
+
+	return cp;
+}
+
+/*==========================================================
+**
+**
+**	Release one control block
+**
+**
+**==========================================================
+*/
+
+static void ncr_free_ccb (struct ncb *np, struct ccb *cp)
+{
+	struct tcb *tp = &np->target[cp->target];
+	struct lcb *lp = tp->lp[cp->lun];
+
+	if (DEBUG_FLAGS & DEBUG_TAGS) {
+		PRINT_ADDR(cp->cmd, "ccb @%p freeing tag %d.\n", cp, cp->tag);
+	}
+
+	/*
+	**	If lun control block available,
+	**	decrement active commands and increment credit, 
+	**	free the tag if any and remove the JUMP for reselect.
+	*/
+	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_umap &= ~(((tagmap_t) 1) << cp->tag);
+			lp->tags_smap &= lp->tags_umap;
+			lp->jump_ccb[cp->tag] =
+				cpu_to_scr(NCB_SCRIPTH_PHYS(np, bad_i_t_l_q));
+		} else {
+			lp->jump_ccb[0] =
+				cpu_to_scr(NCB_SCRIPTH_PHYS(np, bad_i_t_l));
+		}
+	}
+
+	/*
+	**	Make this CCB available.
+	*/
+
+	if (lp) {
+		if (cp != np->ccb)
+			list_move(&cp->link_ccbq, &lp->free_ccbq);
+		--lp->busyccbs;
+		if (cp->queued) {
+			--lp->queuedccbs;
+		}
+	}
+	cp -> host_status = HS_IDLE;
+	cp -> magic = 0;
+	if (cp->queued) {
+		--np->queuedccbs;
+		cp->queued = 0;
+	}
+
+#if 0
+	if (cp == np->ccb)
+		wakeup ((caddr_t) cp);
+#endif
+}
+
+
+#define ncr_reg_bus_addr(r) (np->paddr + offsetof (struct ncr_reg, r))
+
+/*------------------------------------------------------------------------
+**	Initialize the fixed part of a CCB structure.
+**------------------------------------------------------------------------
+**------------------------------------------------------------------------
+*/
+static void ncr_init_ccb(struct ncb *np, struct ccb *cp)
+{
+	ncrcmd copy_4 = np->features & FE_PFEN ? SCR_COPY(4) : SCR_COPY_F(4);
+
+	/*
+	**	Remember virtual and bus address of this ccb.
+	*/
+	cp->p_ccb 	   = vtobus(cp);
+	cp->phys.header.cp = cp;
+
+	/*
+	**	This allows list_del to work for the default ccb.
+	*/
+	INIT_LIST_HEAD(&cp->link_ccbq);
+
+	/*
+	**	Initialyze the start and restart launch script.
+	**
+	**	COPY(4) @(...p_phys), @(dsa)
+	**	JUMP @(sched_point)
+	*/
+	cp->start.setup_dsa[0]	 = cpu_to_scr(copy_4);
+	cp->start.setup_dsa[1]	 = cpu_to_scr(CCB_PHYS(cp, start.p_phys));
+	cp->start.setup_dsa[2]	 = cpu_to_scr(ncr_reg_bus_addr(nc_dsa));
+	cp->start.schedule.l_cmd = cpu_to_scr(SCR_JUMP);
+	cp->start.p_phys	 = cpu_to_scr(CCB_PHYS(cp, phys));
+
+	memcpy(&cp->restart, &cp->start, sizeof(cp->restart));
+
+	cp->start.schedule.l_paddr   = cpu_to_scr(NCB_SCRIPT_PHYS (np, idle));
+	cp->restart.schedule.l_paddr = cpu_to_scr(NCB_SCRIPTH_PHYS (np, abort));
+}
+
+
+/*------------------------------------------------------------------------
+**	Allocate a CCB and initialize its fixed part.
+**------------------------------------------------------------------------
+**------------------------------------------------------------------------
+*/
+static void ncr_alloc_ccb(struct ncb *np, u_char tn, u_char ln)
+{
+	struct tcb *tp = &np->target[tn];
+	struct lcb *lp = tp->lp[ln];
+	struct ccb *cp = NULL;
+
+	/*
+	**	Allocate memory for this CCB.
+	*/
+	cp = m_calloc_dma(sizeof(struct ccb), "CCB");
+	if (!cp)
+		return;
+
+	/*
+	**	Count it and initialyze it.
+	*/
+	lp->actccbs++;
+	np->actccbs++;
+	memset(cp, 0, sizeof (*cp));
+	ncr_init_ccb(np, cp);
+
+	/*
+	**	Chain into wakeup list and free ccb queue and take it 
+	**	into account for tagged commands.
+	*/
+	cp->link_ccb      = np->ccb->link_ccb;
+	np->ccb->link_ccb = cp;
+
+	list_add(&cp->link_ccbq, &lp->free_ccbq);
+}
+
+/*==========================================================
+**
+**
+**      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.
+**	It contains a SCRIPT that is called on target reselection.
+**------------------------------------------------------------------------
+*/
+static void ncr_init_tcb (struct ncb *np, u_char tn)
+{
+	struct tcb *tp = &np->target[tn];
+	ncrcmd copy_1 = np->features & FE_PFEN ? SCR_COPY(1) : SCR_COPY_F(1);
+	int th = tn & 3;
+	int i;
+
+	/*
+	**	Jump to next tcb if SFBR does not match this target.
+	**	JUMP  IF (SFBR != #target#), @(next tcb)
+	*/
+	tp->jump_tcb.l_cmd   =
+		cpu_to_scr((SCR_JUMP ^ IFFALSE (DATA (0x80 + tn))));
+	tp->jump_tcb.l_paddr = np->jump_tcb[th].l_paddr;
+
+	/*
+	**	Load the synchronous transfer register.
+	**	COPY @(tp->sval), @(sxfer)
+	*/
+	tp->getscr[0] =	cpu_to_scr(copy_1);
+	tp->getscr[1] = cpu_to_scr(vtobus (&tp->sval));
+#ifdef SCSI_NCR_BIG_ENDIAN
+	tp->getscr[2] = cpu_to_scr(ncr_reg_bus_addr(nc_sxfer) ^ 3);
+#else
+	tp->getscr[2] = cpu_to_scr(ncr_reg_bus_addr(nc_sxfer));
+#endif
+
+	/*
+	**	Load the timing register.
+	**	COPY @(tp->wval), @(scntl3)
+	*/
+	tp->getscr[3] =	cpu_to_scr(copy_1);
+	tp->getscr[4] = cpu_to_scr(vtobus (&tp->wval));
+#ifdef SCSI_NCR_BIG_ENDIAN
+	tp->getscr[5] = cpu_to_scr(ncr_reg_bus_addr(nc_scntl3) ^ 3);
+#else
+	tp->getscr[5] = cpu_to_scr(ncr_reg_bus_addr(nc_scntl3));
+#endif
+
+	/*
+	**	Get the IDENTIFY message and the lun.
+	**	CALL @script(resel_lun)
+	*/
+	tp->call_lun.l_cmd   = cpu_to_scr(SCR_CALL);
+	tp->call_lun.l_paddr = cpu_to_scr(NCB_SCRIPT_PHYS (np, resel_lun));
+
+	/*
+	**	Look for the lun control block of this nexus.
+	**	For i = 0 to 3
+	**		JUMP ^ IFTRUE (MASK (i, 3)), @(next_lcb)
+	*/
+	for (i = 0 ; i < 4 ; i++) {
+		tp->jump_lcb[i].l_cmd   =
+				cpu_to_scr((SCR_JUMP ^ IFTRUE (MASK (i, 3))));
+		tp->jump_lcb[i].l_paddr =
+				cpu_to_scr(NCB_SCRIPTH_PHYS (np, bad_identify));
+	}
+
+	/*
+	**	Link this target control block to the JUMP chain.
+	*/
+	np->jump_tcb[th].l_paddr = cpu_to_scr(vtobus (&tp->jump_tcb));
+
+	/*
+	**	These assert's should be moved at driver initialisations.
+	*/
+#ifdef SCSI_NCR_BIG_ENDIAN
+	BUG_ON(((offsetof(struct ncr_reg, nc_sxfer) ^
+		 offsetof(struct tcb    , sval    )) &3) != 3);
+	BUG_ON(((offsetof(struct ncr_reg, nc_scntl3) ^
+		 offsetof(struct tcb    , wval    )) &3) != 3);
+#else
+	BUG_ON(((offsetof(struct ncr_reg, nc_sxfer) ^
+		 offsetof(struct tcb    , sval    )) &3) != 0);
+	BUG_ON(((offsetof(struct ncr_reg, nc_scntl3) ^
+		 offsetof(struct tcb    , wval    )) &3) != 0);
+#endif
+}
+
+
+/*------------------------------------------------------------------------
+**	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 struct lcb *ncr_alloc_lcb (struct ncb *np, u_char tn, u_char ln)
+{
+	struct tcb *tp = &np->target[tn];
+	struct lcb *lp = tp->lp[ln];
+	ncrcmd copy_4 = np->features & FE_PFEN ? SCR_COPY(4) : SCR_COPY_F(4);
+	int lh = ln & 3;
+
+	/*
+	**	Already done, return.
+	*/
+	if (lp)
+		return lp;
+
+	/*
+	**	Allocate the lcb.
+	*/
+	lp = m_calloc_dma(sizeof(struct lcb), "LCB");
+	if (!lp)
+		goto fail;
+	memset(lp, 0, sizeof(*lp));
+	tp->lp[ln] = lp;
+
+	/*
+	**	Initialize the target control block if not yet.
+	*/
+	if (!tp->jump_tcb.l_cmd)
+		ncr_init_tcb(np, tn);
+
+	/*
+	**	Initialize the CCB queue headers.
+	*/
+	INIT_LIST_HEAD(&lp->free_ccbq);
+	INIT_LIST_HEAD(&lp->busy_ccbq);
+	INIT_LIST_HEAD(&lp->wait_ccbq);
+	INIT_LIST_HEAD(&lp->skip_ccbq);
+
+	/*
+	**	Set max CCBs to 1 and use the default 1 entry 
+	**	jump table by default.
+	*/
+	lp->maxnxs	= 1;
+	lp->jump_ccb	= &lp->jump_ccb_0;
+	lp->p_jump_ccb	= cpu_to_scr(vtobus(lp->jump_ccb));
+
+	/*
+	**	Initilialyze the reselect script:
+	**
+	**	Jump to next lcb if SFBR does not match this lun.
+	**	Load TEMP with the CCB direct jump table bus address.
+	**	Get the SIMPLE TAG message and the tag.
+	**
+	**	JUMP  IF (SFBR != #lun#), @(next lcb)
+	**	COPY @(lp->p_jump_ccb),	  @(temp)
+	**	JUMP @script(resel_notag)
+	*/
+	lp->jump_lcb.l_cmd   =
+		cpu_to_scr((SCR_JUMP ^ IFFALSE (MASK (0x80+ln, 0xff))));
+	lp->jump_lcb.l_paddr = tp->jump_lcb[lh].l_paddr;
+
+	lp->load_jump_ccb[0] = cpu_to_scr(copy_4);
+	lp->load_jump_ccb[1] = cpu_to_scr(vtobus (&lp->p_jump_ccb));
+	lp->load_jump_ccb[2] = cpu_to_scr(ncr_reg_bus_addr(nc_temp));
+
+	lp->jump_tag.l_cmd   = cpu_to_scr(SCR_JUMP);
+	lp->jump_tag.l_paddr = cpu_to_scr(NCB_SCRIPT_PHYS (np, resel_notag));
+
+	/*
+	**	Link this lun control block to the JUMP chain.
+	*/
+	tp->jump_lcb[lh].l_paddr = cpu_to_scr(vtobus (&lp->jump_lcb));
+
+	/*
+	**	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 struct lcb *ncr_setup_lcb (struct ncb *np, struct scsi_device *sdev)
+{
+	unsigned char tn = sdev->id, ln = sdev->lun;
+	struct tcb *tp = &np->target[tn];
+	struct lcb *lp = tp->lp[ln];
+
+	/* If no lcb, try to allocate it.  */
+	if (!lp && !(lp = ncr_alloc_lcb(np, tn, ln)))
+		goto fail;
+
+	/*
+	**	If unit supports tagged commands, allocate the 
+	**	CCB JUMP table if not yet.
+	*/
+	if (sdev->tagged_supported && lp->jump_ccb == &lp->jump_ccb_0) {
+		int i;
+		lp->jump_ccb = m_calloc_dma(256, "JUMP_CCB");
+		if (!lp->jump_ccb) {
+			lp->jump_ccb = &lp->jump_ccb_0;
+			goto fail;
+		}
+		lp->p_jump_ccb = cpu_to_scr(vtobus(lp->jump_ccb));
+		for (i = 0 ; i < 64 ; i++)
+			lp->jump_ccb[i] =
+				cpu_to_scr(NCB_SCRIPTH_PHYS (np, bad_i_t_l_q));
+		for (i = 0 ; i < MAX_TAGS ; i++)
+			lp->cb_tags[i] = i;
+		lp->maxnxs = MAX_TAGS;
+		lp->tags_stime = jiffies + 3*HZ;
+		ncr_setup_tags (np, sdev);
+	}
+
+
+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.
+*/
+
+static int ncr_scatter(struct ncb *np, struct ccb *cp, struct scsi_cmnd *cmd)
+{
+	int segment	= 0;
+	int use_sg	= scsi_sg_count(cmd);
+
+	cp->data_len	= 0;
+
+	use_sg = map_scsi_sg_data(np, cmd);
+	if (use_sg > 0) {
+		struct scatterlist *sg;
+		struct scr_tblmove *data;
+
+		if (use_sg > MAX_SCATTER) {
+			unmap_scsi_data(np, cmd);
+			return -1;
+		}
+
+		data = &cp->phys.data[MAX_SCATTER - use_sg];
+
+		scsi_for_each_sg(cmd, sg, use_sg, segment) {
+			dma_addr_t baddr = sg_dma_address(sg);
+			unsigned int len = sg_dma_len(sg);
+
+			ncr_build_sge(np, &data[segment], baddr, len);
+			cp->data_len += len;
+		}
+	} else
+		segment = -2;
+
+	return segment;
+}
+
+/*==========================================================
+**
+**
+**	Test the bus snoop logic :-(
+**
+**	Has to be called with interrupts disabled.
+**
+**
+**==========================================================
+*/
+
+static int __init ncr_regtest (struct ncb* np)
+{
+	register volatile u32 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);
+}
+
+static int __init ncr_snooptest (struct ncb* np)
+{
+	u32	ncr_rd, ncr_wr, ncr_bk, host_rd, host_wr, pc;
+	int	i, err=0;
+	if (np->reg) {
+		err |= ncr_regtest (np);
+		if (err)
+			return (err);
+	}
+
+	/* init */
+	pc  = NCB_SCRIPTH_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_DSP (pc);
+	/*
+	**	Wait 'til done (with timeout)
+	*/
+	for (i=0; i<NCR_SNOOP_TIMEOUT; i++)
+		if (INB(nc_istat) & (INTF|SIP|DIP))
+			break;
+	/*
+	**	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);
+	/*
+	**	Reset ncr chip
+	*/
+	ncr_chip_reset(np, 100);
+	/*
+	**	check for timeout
+	*/
+	if (i>=NCR_SNOOP_TIMEOUT) {
+		printk ("CACHE TEST FAILED: timeout.\n");
+		return (0x20);
+	}
+	/*
+	**	Check termination position.
+	*/
+	if (pc != NCB_SCRIPTH_PHYS (np, snoopend)+8) {
+		printk ("CACHE TEST FAILED: script execution failed.\n");
+		printk ("start=%08lx, pc=%08lx, end=%08lx\n", 
+			(u_long) NCB_SCRIPTH_PHYS (np, snooptest), (u_long) pc,
+			(u_long) NCB_SCRIPTH_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 future fast40 chips (895/895) 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(struct ncb *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->multiplier > 2) {  /* Poll bit 5 of stest4 for quadrupler */
+		int i = 20;
+		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 20 micro-seconds for doubler	*/
+		udelay(20);
+	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 (struct ncb *np, int gen)
+{
+	unsigned ms = 0;
+	char count = 0;
+
+	/*
+	 * 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).
+	 */
+	OUTB (nc_stest1, 0);	/* make sure clock doubler is OFF */
+	OUTW (nc_sien , 0);	/* mask all scsi interrupts */
+	(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 */
+	while (!(INW(nc_sist) & GEN) && ms++ < 100000) {
+		for (count = 0; count < 10; count ++)
+			udelay(100);	/* count ms */
+	}
+	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);
+
+	if (bootverbose >= 2)
+		printk ("%s: Delay (GEN=%d): %u msec\n", ncr_name(np), gen, ms);
+  	/*
+ 	 * adjust for prescaler, and convert into KHz 
+  	 */
+	return ms ? ((1 << gen) * 4340) / ms : 0;
+}
+
+/*
+ *	Get/probe NCR SCSI clock frequency
+ */
+static void __init ncr_getclock (struct ncb *np, int mult)
+{
+	unsigned char scntl3 = INB(nc_scntl3);
+	unsigned char stest1 = INB(nc_stest1);
+	unsigned f1;
+
+	np->multiplier = 1;
+	f1 = 40000;
+
+	/*
+	**	True with 875 or 895 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)) {
+		unsigned f2;
+
+		ncr_chip_reset(np, 5);
+
+		(void) ncrgetfreq (np, 11);	/* throw away first result */
+		f1 = ncrgetfreq (np, 11);
+		f2 = ncrgetfreq (np, 11);
+
+		if(bootverbose)
+			printk ("%s: NCR clock is %uKHz, %uKHz\n", ncr_name(np), f1, f2);
+
+		if (f1 > f2) f1 = f2;		/* trust lower result	*/
+
+		if	(f1 <	45000)		f1 =  40000;
+		else if (f1 <	55000)		f1 =  50000;
+		else				f1 =  80000;
+
+		if (f1 < 80000 && 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;
+}
+
+/*===================== LINUX ENTRY POINTS SECTION ==========================*/
+
+static int ncr53c8xx_slave_alloc(struct scsi_device *device)
+{
+	struct Scsi_Host *host = device->host;
+	struct ncb *np = ((struct host_data *) host->hostdata)->ncb;
+	struct tcb *tp = &np->target[device->id];
+	tp->starget = device->sdev_target;
+
+	return 0;
+}
+
+static int ncr53c8xx_slave_configure(struct scsi_device *device)
+{
+	struct Scsi_Host *host = device->host;
+	struct ncb *np = ((struct host_data *) host->hostdata)->ncb;
+	struct tcb *tp = &np->target[device->id];
+	struct lcb *lp = tp->lp[device->lun];
+	int numtags, depth_to_use;
+
+	ncr_setup_lcb(np, device);
+
+	/*
+	**	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->unit, 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_change_queue_depth(device, 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.
+	**
+	**	XXX(hch): As of Linux 2.6 it certainly _is_ tunable..
+	**		  In fact we just tuned it, or did I miss
+	**		  something important? :)
+	*/
+	if (lp) {
+		lp->numtags = lp->maxtags = numtags;
+		lp->scdev_depth = depth_to_use;
+	}
+	ncr_setup_tags (np, device);
+
+#ifdef DEBUG_NCR53C8XX
+	printk("ncr53c8xx_select_queue_depth: host=%d, id=%d, lun=%d, depth=%d\n",
+	       np->unit, device->id, device->lun, depth_to_use);
+#endif
+
+	if (spi_support_sync(device->sdev_target) &&
+	    !spi_initial_dv(device->sdev_target))
+		spi_dv_device(device);
+	return 0;
+}
+
+static int ncr53c8xx_queue_command_lck (struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
+{
+     struct ncb *np = ((struct host_data *) cmd->device->host->hostdata)->ncb;
+     unsigned long flags;
+     int sts;
+
+#ifdef DEBUG_NCR53C8XX
+printk("ncr53c8xx_queue_command\n");
+#endif
+
+     cmd->scsi_done     = done;
+     cmd->host_scribble = NULL;
+     cmd->__data_mapped = 0;
+     cmd->__data_mapping = 0;
+
+     spin_lock_irqsave(&np->smp_lock, flags);
+
+     if ((sts = ncr_queue_command(np, cmd)) != DID_OK) {
+	  cmd->result = ScsiResult(sts, 0);
+#ifdef DEBUG_NCR53C8XX
+printk("ncr53c8xx : command not queued - result=%d\n", sts);
+#endif
+     }
+#ifdef DEBUG_NCR53C8XX
+     else
+printk("ncr53c8xx : command successfully queued\n");
+#endif
+
+     spin_unlock_irqrestore(&np->smp_lock, flags);
+
+     if (sts != DID_OK) {
+          unmap_scsi_data(np, cmd);
+          done(cmd);
+	  sts = 0;
+     }
+
+     return sts;
+}
+
+static DEF_SCSI_QCMD(ncr53c8xx_queue_command)
+
+irqreturn_t ncr53c8xx_intr(int irq, void *dev_id)
+{
+     unsigned long flags;
+     struct Scsi_Host *shost = (struct Scsi_Host *)dev_id;
+     struct host_data *host_data = (struct host_data *)shost->hostdata;
+     struct ncb *np = host_data->ncb;
+     struct scsi_cmnd *done_list;
+
+#ifdef DEBUG_NCR53C8XX
+     printk("ncr53c8xx : interrupt received\n");
+#endif
+
+     if (DEBUG_FLAGS & DEBUG_TINY) printk ("[");
+
+     spin_lock_irqsave(&np->smp_lock, flags);
+     ncr_exception(np);
+     done_list     = np->done_list;
+     np->done_list = NULL;
+     spin_unlock_irqrestore(&np->smp_lock, flags);
+
+     if (DEBUG_FLAGS & DEBUG_TINY) printk ("]\n");
+
+     if (done_list)
+	     ncr_flush_done_cmds(done_list);
+     return IRQ_HANDLED;
+}
+
+static void ncr53c8xx_timeout(unsigned long npref)
+{
+	struct ncb *np = (struct ncb *) npref;
+	unsigned long flags;
+	struct scsi_cmnd *done_list;
+
+	spin_lock_irqsave(&np->smp_lock, flags);
+	ncr_timeout(np);
+	done_list     = np->done_list;
+	np->done_list = NULL;
+	spin_unlock_irqrestore(&np->smp_lock, flags);
+
+	if (done_list)
+		ncr_flush_done_cmds(done_list);
+}
+
+static int ncr53c8xx_bus_reset(struct scsi_cmnd *cmd)
+{
+	struct ncb *np = ((struct host_data *) cmd->device->host->hostdata)->ncb;
+	int sts;
+	unsigned long flags;
+	struct scsi_cmnd *done_list;
+
+	/*
+	 * 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 SUCCESS.
+	 */
+
+	spin_lock_irqsave(&np->smp_lock, flags);
+	sts = ncr_reset_bus(np, cmd, 1);
+
+	done_list     = np->done_list;
+	np->done_list = NULL;
+	spin_unlock_irqrestore(&np->smp_lock, flags);
+
+	ncr_flush_done_cmds(done_list);
+
+	return sts;
+}
+
+#if 0 /* unused and broken */
+static int ncr53c8xx_abort(struct scsi_cmnd *cmd)
+{
+	struct ncb *np = ((struct host_data *) cmd->device->host->hostdata)->ncb;
+	int sts;
+	unsigned long flags;
+	struct scsi_cmnd *done_list;
+
+	printk("ncr53c8xx_abort\n");
+
+	NCR_LOCK_NCB(np, flags);
+
+	sts = ncr_abort_command(np, cmd);
+out:
+	done_list     = np->done_list;
+	np->done_list = NULL;
+	NCR_UNLOCK_NCB(np, flags);
+
+	ncr_flush_done_cmds(done_list);
+
+	return sts;
+}
+#endif
+
+
+/*
+**	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(struct ncb *np, struct scsi_cmnd *cmd)
+{
+	struct 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 = NULL;
+	if (!(wcmd = np->waiting_list)) np->waiting_list = cmd;
+	else {
+		while (wcmd->next_wcmd)
+			wcmd = (struct scsi_cmnd *) wcmd->next_wcmd;
+		wcmd->next_wcmd = (char *) cmd;
+	}
+}
+
+static struct scsi_cmnd *retrieve_from_waiting_list(int to_remove, struct ncb *np, struct scsi_cmnd *cmd)
+{
+	struct scsi_cmnd **pcmd = &np->waiting_list;
+
+	while (*pcmd) {
+		if (cmd == *pcmd) {
+			if (to_remove) {
+				*pcmd = (struct scsi_cmnd *) cmd->next_wcmd;
+				cmd->next_wcmd = NULL;
+			}
+#ifdef DEBUG_WAITING_LIST
+	printk("%s: cmd %lx retrieved from waiting list\n", ncr_name(np), (u_long) cmd);
+#endif
+			return cmd;
+		}
+		pcmd = (struct scsi_cmnd **) &(*pcmd)->next_wcmd;
+	}
+	return NULL;
+}
+
+static void process_waiting_list(struct ncb *np, int sts)
+{
+	struct scsi_cmnd *waiting_list, *wcmd;
+
+	waiting_list = np->waiting_list;
+	np->waiting_list = NULL;
+
+#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) != NULL) {
+		waiting_list = (struct scsi_cmnd *) wcmd->next_wcmd;
+		wcmd->next_wcmd = NULL;
+		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
+			wcmd->result = ScsiResult(sts, 0);
+			ncr_queue_done_cmd(np, wcmd);
+		}
+	}
+}
+
+#undef next_wcmd
+
+static ssize_t show_ncr53c8xx_revision(struct device *dev,
+				       struct device_attribute *attr, char *buf)
+{
+	struct Scsi_Host *host = class_to_shost(dev);
+	struct host_data *host_data = (struct host_data *)host->hostdata;
+  
+	return snprintf(buf, 20, "0x%x\n", host_data->ncb->revision_id);
+}
+  
+static struct device_attribute ncr53c8xx_revision_attr = {
+	.attr	= { .name = "revision", .mode = S_IRUGO, },
+	.show	= show_ncr53c8xx_revision,
+};
+  
+static struct device_attribute *ncr53c8xx_host_attrs[] = {
+	&ncr53c8xx_revision_attr,
+	NULL
+};
+
+/*==========================================================
+**
+**	Boot command line.
+**
+**==========================================================
+*/
+#ifdef	MODULE
+char *ncr53c8xx;	/* command line passed by insmod */
+module_param(ncr53c8xx, charp, 0);
+#endif
+
+#ifndef MODULE
+static int __init ncr53c8xx_setup(char *str)
+{
+	return sym53c8xx__setup(str);
+}
+
+__setup("ncr53c8xx=", ncr53c8xx_setup);
+#endif
+
+
+/*
+ *	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.
+ */
+struct Scsi_Host * __init ncr_attach(struct scsi_host_template *tpnt,
+					int unit, struct ncr_device *device)
+{
+	struct host_data *host_data;
+	struct ncb *np = NULL;
+	struct Scsi_Host *instance = NULL;
+	u_long flags = 0;
+	int i;
+
+	if (!tpnt->name)
+		tpnt->name	= SCSI_NCR_DRIVER_NAME;
+	if (!tpnt->shost_attrs)
+		tpnt->shost_attrs = ncr53c8xx_host_attrs;
+
+	tpnt->queuecommand	= ncr53c8xx_queue_command;
+	tpnt->slave_configure	= ncr53c8xx_slave_configure;
+	tpnt->slave_alloc	= ncr53c8xx_slave_alloc;
+	tpnt->eh_bus_reset_handler = ncr53c8xx_bus_reset;
+	tpnt->can_queue		= SCSI_NCR_CAN_QUEUE;
+	tpnt->this_id		= 7;
+	tpnt->sg_tablesize	= SCSI_NCR_SG_TABLESIZE;
+	tpnt->cmd_per_lun	= SCSI_NCR_CMD_PER_LUN;
+	tpnt->use_clustering	= ENABLE_CLUSTERING;
+
+	if (device->differential)
+		driver_setup.diff_support = device->differential;
+
+	printk(KERN_INFO "ncr53c720-%d: rev 0x%x irq %d\n",
+		unit, device->chip.revision_id, device->slot.irq);
+
+	instance = scsi_host_alloc(tpnt, sizeof(*host_data));
+	if (!instance)
+	        goto attach_error;
+	host_data = (struct host_data *) instance->hostdata;
+
+	np = __m_calloc_dma(device->dev, sizeof(struct ncb), "NCB");
+	if (!np)
+		goto attach_error;
+	spin_lock_init(&np->smp_lock);
+	np->dev = device->dev;
+	np->p_ncb = vtobus(np);
+	host_data->ncb = np;
+
+	np->ccb = m_calloc_dma(sizeof(struct ccb), "CCB");
+	if (!np->ccb)
+		goto attach_error;
+
+	/* Store input information in the host data structure.  */
+	np->unit	= unit;
+	np->verbose	= driver_setup.verbose;
+	sprintf(np->inst_name, "ncr53c720-%d", np->unit);
+	np->revision_id	= device->chip.revision_id;
+	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 SCRIPTS areas.  */
+	np->script0 = m_calloc_dma(sizeof(struct script), "SCRIPT");
+	if (!np->script0)
+		goto attach_error;
+	np->scripth0 = m_calloc_dma(sizeof(struct scripth), "SCRIPTH");
+	if (!np->scripth0)
+		goto attach_error;
+
+	init_timer(&np->timer);
+	np->timer.data     = (unsigned long) np;
+	np->timer.function = ncr53c8xx_timeout;
+
+	/* Try to map the controller chip to virtual and physical memory. */
+
+	np->paddr	= device->slot.base;
+	np->paddr2	= (np->features & FE_RAM) ? device->slot.base_2 : 0;
+
+	if (device->slot.base_v)
+		np->vaddr = device->slot.base_v;
+	else
+		np->vaddr = ioremap(device->slot.base_c, 128);
+
+	if (!np->vaddr) {
+		printk(KERN_ERR
+			"%s: can't map memory mapped IO region\n",ncr_name(np));
+		goto attach_error;
+	} else {
+		if (bootverbose > 1)
+			printk(KERN_INFO
+				"%s: using memory mapped IO at virtual address 0x%lx\n", ncr_name(np), (u_long) np->vaddr);
+	}
+
+	/* Make the controller's registers available.  Now the INB INW INL
+	 * OUTB OUTW OUTL macros can be used safely.
+	 */
+
+	np->reg = (struct ncr_reg __iomem *)np->vaddr;
+
+	/* Do chip dependent initialization.  */
+	ncr_prepare_setting(np);
+
+	if (np->paddr2 && sizeof(struct script) > 4096) {
+		np->paddr2 = 0;
+		printk(KERN_WARNING "%s: script too large, NOT using on chip RAM.\n",
+			ncr_name(np));
+	}
+
+	instance->max_channel	= 0;
+	instance->this_id       = np->myaddr;
+	instance->max_id	= np->maxwide ? 16 : 8;
+	instance->max_lun	= SCSI_NCR_MAX_LUN;
+	instance->base		= (unsigned long) np->reg;
+	instance->irq		= device->slot.irq;
+	instance->unique_id	= device->slot.base;
+	instance->dma_channel	= 0;
+	instance->cmd_per_lun	= MAX_TAGS;
+	instance->can_queue	= (MAX_START-4);
+	/* This can happen if you forget to call ncr53c8xx_init from
+	 * your module_init */
+	BUG_ON(!ncr53c8xx_transport_template);
+	instance->transportt	= ncr53c8xx_transport_template;
+
+	/* Patch script to physical addresses */
+	ncr_script_fill(&script0, &scripth0);
+
+	np->scripth	= np->scripth0;
+	np->p_scripth	= vtobus(np->scripth);
+	np->p_script	= (np->paddr2) ?  np->paddr2 : vtobus(np->script0);
+
+	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));
+	np->ccb->p_ccb	= vtobus (np->ccb);
+
+	/* 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));
+	}
+
+	/*
+	 * Look for the target control block of this nexus.
+	 * For i = 0 to 3
+	 *   JUMP ^ IFTRUE (MASK (i, 3)), @(next_lcb)
+	 */
+	for (i = 0 ; i < 4 ; i++) {
+		np->jump_tcb[i].l_cmd   =
+				cpu_to_scr((SCR_JUMP ^ IFTRUE (MASK (i, 3))));
+		np->jump_tcb[i].l_paddr =
+				cpu_to_scr(NCB_SCRIPTH_PHYS (np, bad_target));
+	}
+
+	ncr_chip_reset(np, 100);
+
+	/* Now check the cache handling of the chipset.  */
+
+	if (ncr_snooptest(np)) {
+		printk(KERN_ERR "CACHE INCORRECTLY CONFIGURED.\n");
+		goto attach_error;
+	}
+
+	/* Install the interrupt handler.  */
+	np->irq = device->slot.irq;
+
+	/* Initialize the fixed part of the default ccb.  */
+	ncr_init_ccb(np, np->ccb);
+
+	/*
+	 * 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.
+	 */
+	spin_lock_irqsave(&np->smp_lock, 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));
+
+		spin_unlock_irqrestore(&np->smp_lock, flags);
+		goto attach_error;
+	}
+	ncr_exception(np);
+
+	np->disc = 1;
+
+	/*
+	 * 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 = SIMPLE_QUEUE_TAG;
+#endif
+
+	spin_unlock_irqrestore(&np->smp_lock, flags);
+
+	return instance;
+
+ attach_error:
+	if (!instance)
+		return NULL;
+	printk(KERN_INFO "%s: detaching...\n", ncr_name(np));
+	if (!np)
+		goto unregister;
+	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->ccb)
+		m_free_dma(np->ccb, sizeof(struct ccb), "CCB");
+	m_free_dma(np, sizeof(struct ncb), "NCB");
+	host_data->ncb = NULL;
+
+ unregister:
+	scsi_host_put(instance);
+
+	return NULL;
+}
+
+
+void ncr53c8xx_release(struct Scsi_Host *host)
+{
+	struct host_data *host_data = shost_priv(host);
+#ifdef DEBUG_NCR53C8XX
+	printk("ncr53c8xx: release\n");
+#endif
+	if (host_data->ncb)
+		ncr_detach(host_data->ncb);
+	scsi_host_put(host);
+}
+
+static void ncr53c8xx_set_period(struct scsi_target *starget, int period)
+{
+	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
+	struct ncb *np = ((struct host_data *)shost->hostdata)->ncb;
+	struct tcb *tp = &np->target[starget->id];
+
+	if (period > np->maxsync)
+		period = np->maxsync;
+	else if (period < np->minsync)
+		period = np->minsync;
+
+	tp->usrsync = period;
+
+	ncr_negotiate(np, tp);
+}
+
+static void ncr53c8xx_set_offset(struct scsi_target *starget, int offset)
+{
+	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
+	struct ncb *np = ((struct host_data *)shost->hostdata)->ncb;
+	struct tcb *tp = &np->target[starget->id];
+
+	if (offset > np->maxoffs)
+		offset = np->maxoffs;
+	else if (offset < 0)
+		offset = 0;
+
+	tp->maxoffs = offset;
+
+	ncr_negotiate(np, tp);
+}
+
+static void ncr53c8xx_set_width(struct scsi_target *starget, int width)
+{
+	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
+	struct ncb *np = ((struct host_data *)shost->hostdata)->ncb;
+	struct tcb *tp = &np->target[starget->id];
+
+	if (width > np->maxwide)
+		width = np->maxwide;
+	else if (width < 0)
+		width = 0;
+
+	tp->usrwide = width;
+
+	ncr_negotiate(np, tp);
+}
+
+static void ncr53c8xx_get_signalling(struct Scsi_Host *shost)
+{
+	struct ncb *np = ((struct host_data *)shost->hostdata)->ncb;
+	enum spi_signal_type type;
+
+	switch (np->scsi_mode) {
+	case SMODE_SE:
+		type = SPI_SIGNAL_SE;
+		break;
+	case SMODE_HVD:
+		type = SPI_SIGNAL_HVD;
+		break;
+	default:
+		type = SPI_SIGNAL_UNKNOWN;
+		break;
+	}
+	spi_signalling(shost) = type;
+}
+
+static struct spi_function_template ncr53c8xx_transport_functions =  {
+	.set_period	= ncr53c8xx_set_period,
+	.show_period	= 1,
+	.set_offset	= ncr53c8xx_set_offset,
+	.show_offset	= 1,
+	.set_width	= ncr53c8xx_set_width,
+	.show_width	= 1,
+	.get_signalling	= ncr53c8xx_get_signalling,
+};
+
+int __init ncr53c8xx_init(void)
+{
+	ncr53c8xx_transport_template = spi_attach_transport(&ncr53c8xx_transport_functions);
+	if (!ncr53c8xx_transport_template)
+		return -ENODEV;
+	return 0;
+}
+
+void ncr53c8xx_exit(void)
+{
+	spi_release_transport(ncr53c8xx_transport_template);
+}