Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 2175 insertions, 0 deletions

diff --git a/drivers/scsi/53c700.c b/drivers/scsi/53c700.c
new file mode 100644
index 000000000000..a591fcb8aab1
--- /dev/null
+++ b/drivers/scsi/53c700.c
@@ -0,0 +1,2175 @@
+/* -*- mode: c; c-basic-offset: 8 -*- */
+
+/* NCR (or Symbios) 53c700 and 53c700-66 Driver
+ *
+ * Copyright (C) 2001 by James.Bottomley@HansenPartnership.com
+**-----------------------------------------------------------------------------
+**  
+**  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.
+**
+**-----------------------------------------------------------------------------
+ */
+
+/* Notes:
+ *
+ * This driver is designed exclusively for these chips (virtually the
+ * earliest of the scripts engine chips).  They need their own drivers
+ * because they are missing so many of the scripts and snazzy register
+ * features of their elder brothers (the 710, 720 and 770).
+ *
+ * The 700 is the lowliest of the line, it can only do async SCSI.
+ * The 700-66 can at least do synchronous SCSI up to 10MHz.
+ * 
+ * The 700 chip has no host bus interface logic of its own.  However,
+ * it is usually mapped to a location with well defined register
+ * offsets.  Therefore, if you can determine the base address and the
+ * irq your board incorporating this chip uses, you can probably use
+ * this driver to run it (although you'll probably have to write a
+ * minimal wrapper for the purpose---see the NCR_D700 driver for
+ * details about how to do this).
+ *
+ *
+ * TODO List:
+ *
+ * 1. Better statistics in the proc fs
+ *
+ * 2. Implement message queue (queues SCSI messages like commands) and make
+ *    the abort and device reset functions use them.
+ * */
+
+/* CHANGELOG
+ *
+ * Version 2.8
+ *
+ * Fixed bad bug affecting tag starvation processing (previously the
+ * driver would hang the system if too many tags starved.  Also fixed
+ * bad bug having to do with 10 byte command processing and REQUEST
+ * SENSE (the command would loop forever getting a transfer length
+ * mismatch in the CMD phase).
+ *
+ * Version 2.7
+ *
+ * Fixed scripts problem which caused certain devices (notably CDRWs)
+ * to hang on initial INQUIRY.  Updated NCR_700_readl/writel to use
+ * __raw_readl/writel for parisc compatibility (Thomas
+ * Bogendoerfer). Added missing SCp->request_bufflen initialisation
+ * for sense requests (Ryan Bradetich).
+ *
+ * Version 2.6
+ *
+ * Following test of the 64 bit parisc kernel by Richard Hirst,
+ * several problems have now been corrected.  Also adds support for
+ * consistent memory allocation.
+ *
+ * Version 2.5
+ * 
+ * More Compatibility changes for 710 (now actually works).  Enhanced
+ * support for odd clock speeds which constrain SDTR negotiations.
+ * correct cacheline separation for scsi messages and status for
+ * incoherent architectures.  Use of the pci mapping functions on
+ * buffers to begin support for 64 bit drivers.
+ *
+ * Version 2.4
+ *
+ * Added support for the 53c710 chip (in 53c700 emulation mode only---no 
+ * special 53c710 instructions or registers are used).
+ *
+ * Version 2.3
+ *
+ * More endianness/cache coherency changes.
+ *
+ * Better bad device handling (handles devices lying about tag
+ * queueing support and devices which fail to provide sense data on
+ * contingent allegiance conditions)
+ *
+ * Many thanks to Richard Hirst <rhirst@linuxcare.com> for patiently
+ * debugging this driver on the parisc architecture and suggesting
+ * many improvements and bug fixes.
+ *
+ * Thanks also go to Linuxcare Inc. for providing several PARISC
+ * machines for me to debug the driver on.
+ *
+ * Version 2.2
+ *
+ * Made the driver mem or io mapped; added endian invariance; added
+ * dma cache flushing operations for architectures which need it;
+ * added support for more varied clocking speeds.
+ *
+ * Version 2.1
+ *
+ * Initial modularisation from the D700.  See NCR_D700.c for the rest of
+ * the changelog.
+ * */
+#define NCR_700_VERSION "2.8"
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/ioport.h>
+#include <linux/delay.h>
+#include <linux/spinlock.h>
+#include <linux/completion.h>
+#include <linux/sched.h>
+#include <linux/init.h>
+#include <linux/proc_fs.h>
+#include <linux/blkdev.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <asm/dma.h>
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/pgtable.h>
+#include <asm/byteorder.h>
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_dbg.h>
+#include <scsi/scsi_eh.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_tcq.h>
+#include <scsi/scsi_transport.h>
+#include <scsi/scsi_transport_spi.h>
+
+#include "53c700.h"
+
+/* NOTE: For 64 bit drivers there are points in the code where we use
+ * a non dereferenceable pointer to point to a structure in dma-able
+ * memory (which is 32 bits) so that we can use all of the structure
+ * operations but take the address at the end.  This macro allows us
+ * to truncate the 64 bit pointer down to 32 bits without the compiler
+ * complaining */
+#define to32bit(x)	((__u32)((unsigned long)(x)))
+
+#ifdef NCR_700_DEBUG
+#define STATIC
+#else
+#define STATIC static
+#endif
+
+MODULE_AUTHOR("James Bottomley");
+MODULE_DESCRIPTION("53c700 and 53c700-66 Driver");
+MODULE_LICENSE("GPL");
+
+/* This is the script */
+#include "53c700_d.h"
+
+
+STATIC int NCR_700_queuecommand(struct scsi_cmnd *, void (*done)(struct scsi_cmnd *));
+STATIC int NCR_700_abort(struct scsi_cmnd * SCpnt);
+STATIC int NCR_700_bus_reset(struct scsi_cmnd * SCpnt);
+STATIC int NCR_700_dev_reset(struct scsi_cmnd * SCpnt);
+STATIC int NCR_700_host_reset(struct scsi_cmnd * SCpnt);
+STATIC void NCR_700_chip_setup(struct Scsi_Host *host);
+STATIC void NCR_700_chip_reset(struct Scsi_Host *host);
+STATIC int NCR_700_slave_configure(struct scsi_device *SDpnt);
+STATIC void NCR_700_slave_destroy(struct scsi_device *SDpnt);
+static int NCR_700_change_queue_depth(struct scsi_device *SDpnt, int depth);
+static int NCR_700_change_queue_type(struct scsi_device *SDpnt, int depth);
+
+STATIC struct device_attribute *NCR_700_dev_attrs[];
+
+STATIC struct scsi_transport_template *NCR_700_transport_template = NULL;
+
+static char *NCR_700_phase[] = {
+	"",
+	"after selection",
+	"before command phase",
+	"after command phase",
+	"after status phase",
+	"after data in phase",
+	"after data out phase",
+	"during data phase",
+};
+
+static char *NCR_700_condition[] = {
+	"",
+	"NOT MSG_OUT",
+	"UNEXPECTED PHASE",
+	"NOT MSG_IN",
+	"UNEXPECTED MSG",
+	"MSG_IN",
+	"SDTR_MSG RECEIVED",
+	"REJECT_MSG RECEIVED",
+	"DISCONNECT_MSG RECEIVED",
+	"MSG_OUT",
+	"DATA_IN",
+	
+};
+
+static char *NCR_700_fatal_messages[] = {
+	"unexpected message after reselection",
+	"still MSG_OUT after message injection",
+	"not MSG_IN after selection",
+	"Illegal message length received",
+};
+
+static char *NCR_700_SBCL_bits[] = {
+	"IO ",
+	"CD ",
+	"MSG ",
+	"ATN ",
+	"SEL ",
+	"BSY ",
+	"ACK ",
+	"REQ ",
+};
+
+static char *NCR_700_SBCL_to_phase[] = {
+	"DATA_OUT",
+	"DATA_IN",
+	"CMD_OUT",
+	"STATE",
+	"ILLEGAL PHASE",
+	"ILLEGAL PHASE",
+	"MSG OUT",
+	"MSG IN",
+};
+
+static __u8 NCR_700_SDTR_msg[] = {
+	0x01,			/* Extended message */
+	0x03,			/* Extended message Length */
+	0x01,			/* SDTR Extended message */
+	NCR_700_MIN_PERIOD,
+	NCR_700_MAX_OFFSET
+};
+
+/* This translates the SDTR message offset and period to a value
+ * which can be loaded into the SXFER_REG.
+ *
+ * NOTE: According to SCSI-2, the true transfer period (in ns) is
+ *       actually four times this period value */
+static inline __u8
+NCR_700_offset_period_to_sxfer(struct NCR_700_Host_Parameters *hostdata,
+			       __u8 offset, __u8 period)
+{
+	int XFERP;
+
+	__u8 min_xferp = (hostdata->chip710
+			  ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
+	__u8 max_offset = (hostdata->chip710
+			   ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET);
+
+	if(offset == 0)
+		return 0;
+
+	if(period < hostdata->min_period) {
+		printk(KERN_WARNING "53c700: Period %dns is less than this chip's minimum, setting to %d\n", period*4, NCR_700_SDTR_msg[3]*4);
+		period = hostdata->min_period;
+	}
+	XFERP = (period*4 * hostdata->sync_clock)/1000 - 4;
+	if(offset > max_offset) {
+		printk(KERN_WARNING "53c700: Offset %d exceeds chip maximum, setting to %d\n",
+		       offset, max_offset);
+		offset = max_offset;
+	}
+	if(XFERP < min_xferp) {
+		printk(KERN_WARNING "53c700: XFERP %d is less than minium, setting to %d\n",
+		       XFERP,  min_xferp);
+		XFERP =  min_xferp;
+	}
+	return (offset & 0x0f) | (XFERP & 0x07)<<4;
+}
+
+static inline __u8
+NCR_700_get_SXFER(struct scsi_device *SDp)
+{
+	struct NCR_700_Host_Parameters *hostdata = 
+		(struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
+
+	return NCR_700_offset_period_to_sxfer(hostdata,
+					      spi_offset(SDp->sdev_target),
+					      spi_period(SDp->sdev_target));
+}
+
+struct Scsi_Host *
+NCR_700_detect(struct scsi_host_template *tpnt,
+	       struct NCR_700_Host_Parameters *hostdata, struct device *dev)
+{
+	dma_addr_t pScript, pSlots;
+	__u8 *memory;
+	__u32 *script;
+	struct Scsi_Host *host;
+	static int banner = 0;
+	int j;
+
+	if(tpnt->sdev_attrs == NULL)
+		tpnt->sdev_attrs = NCR_700_dev_attrs;
+
+	memory = dma_alloc_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
+				       &pScript, GFP_KERNEL);
+	if(memory == NULL) {
+		printk(KERN_ERR "53c700: Failed to allocate memory for driver, detatching\n");
+		return NULL;
+	}
+
+	script = (__u32 *)memory;
+	hostdata->msgin = memory + MSGIN_OFFSET;
+	hostdata->msgout = memory + MSGOUT_OFFSET;
+	hostdata->status = memory + STATUS_OFFSET;
+	/* all of these offsets are L1_CACHE_BYTES separated.  It is fatal
+	 * if this isn't sufficient separation to avoid dma flushing issues */
+	BUG_ON(!dma_is_consistent(pScript) && L1_CACHE_BYTES < dma_get_cache_alignment());
+	hostdata->slots = (struct NCR_700_command_slot *)(memory + SLOTS_OFFSET);
+	hostdata->dev = dev;
+		
+	pSlots = pScript + SLOTS_OFFSET;
+
+	/* Fill in the missing routines from the host template */
+	tpnt->queuecommand = NCR_700_queuecommand;
+	tpnt->eh_abort_handler = NCR_700_abort;
+	tpnt->eh_device_reset_handler = NCR_700_dev_reset;
+	tpnt->eh_bus_reset_handler = NCR_700_bus_reset;
+	tpnt->eh_host_reset_handler = NCR_700_host_reset;
+	tpnt->can_queue = NCR_700_COMMAND_SLOTS_PER_HOST;
+	tpnt->sg_tablesize = NCR_700_SG_SEGMENTS;
+	tpnt->cmd_per_lun = NCR_700_CMD_PER_LUN;
+	tpnt->use_clustering = ENABLE_CLUSTERING;
+	tpnt->slave_configure = NCR_700_slave_configure;
+	tpnt->slave_destroy = NCR_700_slave_destroy;
+	tpnt->change_queue_depth = NCR_700_change_queue_depth;
+	tpnt->change_queue_type = NCR_700_change_queue_type;
+	
+	if(tpnt->name == NULL)
+		tpnt->name = "53c700";
+	if(tpnt->proc_name == NULL)
+		tpnt->proc_name = "53c700";
+	
+
+	host = scsi_host_alloc(tpnt, 4);
+	if (!host)
+		return NULL;
+	memset(hostdata->slots, 0, sizeof(struct NCR_700_command_slot)
+	       * NCR_700_COMMAND_SLOTS_PER_HOST);
+	for(j = 0; j < NCR_700_COMMAND_SLOTS_PER_HOST; j++) {
+		dma_addr_t offset = (dma_addr_t)((unsigned long)&hostdata->slots[j].SG[0]
+					  - (unsigned long)&hostdata->slots[0].SG[0]);
+		hostdata->slots[j].pSG = (struct NCR_700_SG_List *)((unsigned long)(pSlots + offset));
+		if(j == 0)
+			hostdata->free_list = &hostdata->slots[j];
+		else
+			hostdata->slots[j-1].ITL_forw = &hostdata->slots[j];
+		hostdata->slots[j].state = NCR_700_SLOT_FREE;
+	}
+
+	for(j = 0; j < sizeof(SCRIPT)/sizeof(SCRIPT[0]); j++) {
+		script[j] = bS_to_host(SCRIPT[j]);
+	}
+
+	/* adjust all labels to be bus physical */
+	for(j = 0; j < PATCHES; j++) {
+		script[LABELPATCHES[j]] = bS_to_host(pScript + SCRIPT[LABELPATCHES[j]]);
+	}
+	/* now patch up fixed addresses. */
+	script_patch_32(script, MessageLocation,
+			pScript + MSGOUT_OFFSET);
+	script_patch_32(script, StatusAddress,
+			pScript + STATUS_OFFSET);
+	script_patch_32(script, ReceiveMsgAddress,
+			pScript + MSGIN_OFFSET);
+
+	hostdata->script = script;
+	hostdata->pScript = pScript;
+	dma_sync_single_for_device(hostdata->dev, pScript, sizeof(SCRIPT), DMA_TO_DEVICE);
+	hostdata->state = NCR_700_HOST_FREE;
+	hostdata->cmd = NULL;
+	host->max_id = 7;
+	host->max_lun = NCR_700_MAX_LUNS;
+	BUG_ON(NCR_700_transport_template == NULL);
+	host->transportt = NCR_700_transport_template;
+	host->unique_id = hostdata->base;
+	host->base = hostdata->base;
+	hostdata->eh_complete = NULL;
+	host->hostdata[0] = (unsigned long)hostdata;
+	/* kick the chip */
+	NCR_700_writeb(0xff, host, CTEST9_REG);
+	if(hostdata->chip710) 
+		hostdata->rev = (NCR_700_readb(host, CTEST8_REG)>>4) & 0x0f;
+	else
+		hostdata->rev = (NCR_700_readb(host, CTEST7_REG)>>4) & 0x0f;
+	hostdata->fast = (NCR_700_readb(host, CTEST9_REG) == 0);
+	if(banner == 0) {
+		printk(KERN_NOTICE "53c700: Version " NCR_700_VERSION " By James.Bottomley@HansenPartnership.com\n");
+		banner = 1;
+	}
+	printk(KERN_NOTICE "scsi%d: %s rev %d %s\n", host->host_no,
+	       hostdata->chip710 ? "53c710" : 
+	       (hostdata->fast ? "53c700-66" : "53c700"),
+	       hostdata->rev, hostdata->differential ?
+	       "(Differential)" : "");
+	/* reset the chip */
+	NCR_700_chip_reset(host);
+
+	if (scsi_add_host(host, dev)) {
+		dev_printk(KERN_ERR, dev, "53c700: scsi_add_host failed\n");
+		scsi_host_put(host);
+		return NULL;
+	}
+
+	spi_signalling(host) = hostdata->differential ? SPI_SIGNAL_HVD :
+		SPI_SIGNAL_SE;
+
+	return host;
+}
+
+int
+NCR_700_release(struct Scsi_Host *host)
+{
+	struct NCR_700_Host_Parameters *hostdata = 
+		(struct NCR_700_Host_Parameters *)host->hostdata[0];
+
+	dma_free_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
+			       hostdata->script, hostdata->pScript);
+	return 1;
+}
+
+static inline __u8
+NCR_700_identify(int can_disconnect, __u8 lun)
+{
+	return IDENTIFY_BASE |
+		((can_disconnect) ? 0x40 : 0) |
+		(lun & NCR_700_LUN_MASK);
+}
+
+/*
+ * Function : static int data_residual (Scsi_Host *host)
+ *
+ * Purpose : return residual data count of what's in the chip.  If you
+ * really want to know what this function is doing, it's almost a
+ * direct transcription of the algorithm described in the 53c710
+ * guide, except that the DBC and DFIFO registers are only 6 bits
+ * wide on a 53c700.
+ *
+ * Inputs : host - SCSI host */
+static inline int
+NCR_700_data_residual (struct Scsi_Host *host) {
+	struct NCR_700_Host_Parameters *hostdata = 
+		(struct NCR_700_Host_Parameters *)host->hostdata[0];
+	int count, synchronous = 0;
+	unsigned int ddir;
+
+	if(hostdata->chip710) {
+		count = ((NCR_700_readb(host, DFIFO_REG) & 0x7f) -
+			 (NCR_700_readl(host, DBC_REG) & 0x7f)) & 0x7f;
+	} else {
+		count = ((NCR_700_readb(host, DFIFO_REG) & 0x3f) -
+			 (NCR_700_readl(host, DBC_REG) & 0x3f)) & 0x3f;
+	}
+	
+	if(hostdata->fast)
+		synchronous = NCR_700_readb(host, SXFER_REG) & 0x0f;
+	
+	/* get the data direction */
+	ddir = NCR_700_readb(host, CTEST0_REG) & 0x01;
+
+	if (ddir) {
+		/* Receive */
+		if (synchronous) 
+			count += (NCR_700_readb(host, SSTAT2_REG) & 0xf0) >> 4;
+		else
+			if (NCR_700_readb(host, SSTAT1_REG) & SIDL_REG_FULL)
+				++count;
+	} else {
+		/* Send */
+		__u8 sstat = NCR_700_readb(host, SSTAT1_REG);
+		if (sstat & SODL_REG_FULL)
+			++count;
+		if (synchronous && (sstat & SODR_REG_FULL))
+			++count;
+	}
+#ifdef NCR_700_DEBUG
+	if(count)
+		printk("RESIDUAL IS %d (ddir %d)\n", count, ddir);
+#endif
+	return count;
+}
+
+/* print out the SCSI wires and corresponding phase from the SBCL register
+ * in the chip */
+static inline char *
+sbcl_to_string(__u8 sbcl)
+{
+	int i;
+	static char ret[256];
+
+	ret[0]='\0';
+	for(i=0; i<8; i++) {
+		if((1<<i) & sbcl) 
+			strcat(ret, NCR_700_SBCL_bits[i]);
+	}
+	strcat(ret, NCR_700_SBCL_to_phase[sbcl & 0x07]);
+	return ret;
+}
+
+static inline __u8
+bitmap_to_number(__u8 bitmap)
+{
+	__u8 i;
+
+	for(i=0; i<8 && !(bitmap &(1<<i)); i++)
+		;
+	return i;
+}
+
+/* Pull a slot off the free list */
+STATIC struct NCR_700_command_slot *
+find_empty_slot(struct NCR_700_Host_Parameters *hostdata)
+{
+	struct NCR_700_command_slot *slot = hostdata->free_list;
+
+	if(slot == NULL) {
+		/* sanity check */
+		if(hostdata->command_slot_count != NCR_700_COMMAND_SLOTS_PER_HOST)
+			printk(KERN_ERR "SLOTS FULL, but count is %d, should be %d\n", hostdata->command_slot_count, NCR_700_COMMAND_SLOTS_PER_HOST);
+		return NULL;
+	}
+
+	if(slot->state != NCR_700_SLOT_FREE)
+		/* should panic! */
+		printk(KERN_ERR "BUSY SLOT ON FREE LIST!!!\n");
+		
+
+	hostdata->free_list = slot->ITL_forw;
+	slot->ITL_forw = NULL;
+
+
+	/* NOTE: set the state to busy here, not queued, since this
+	 * indicates the slot is in use and cannot be run by the IRQ
+	 * finish routine.  If we cannot queue the command when it
+	 * is properly build, we then change to NCR_700_SLOT_QUEUED */
+	slot->state = NCR_700_SLOT_BUSY;
+	hostdata->command_slot_count++;
+	
+	return slot;
+}
+
+STATIC void 
+free_slot(struct NCR_700_command_slot *slot,
+	  struct NCR_700_Host_Parameters *hostdata)
+{
+	if((slot->state & NCR_700_SLOT_MASK) != NCR_700_SLOT_MAGIC) {
+		printk(KERN_ERR "53c700: SLOT %p is not MAGIC!!!\n", slot);
+	}
+	if(slot->state == NCR_700_SLOT_FREE) {
+		printk(KERN_ERR "53c700: SLOT %p is FREE!!!\n", slot);
+	}
+	
+	slot->resume_offset = 0;
+	slot->cmnd = NULL;
+	slot->state = NCR_700_SLOT_FREE;
+	slot->ITL_forw = hostdata->free_list;
+	hostdata->free_list = slot;
+	hostdata->command_slot_count--;
+}
+
+
+/* This routine really does very little.  The command is indexed on
+   the ITL and (if tagged) the ITLQ lists in _queuecommand */
+STATIC void
+save_for_reselection(struct NCR_700_Host_Parameters *hostdata,
+		     struct scsi_cmnd *SCp, __u32 dsp)
+{
+	/* Its just possible that this gets executed twice */
+	if(SCp != NULL) {
+		struct NCR_700_command_slot *slot =
+			(struct NCR_700_command_slot *)SCp->host_scribble;
+
+		slot->resume_offset = dsp;
+	}
+	hostdata->state = NCR_700_HOST_FREE;
+	hostdata->cmd = NULL;
+}
+
+STATIC inline void
+NCR_700_unmap(struct NCR_700_Host_Parameters *hostdata, struct scsi_cmnd *SCp,
+	      struct NCR_700_command_slot *slot)
+{
+	if(SCp->sc_data_direction != DMA_NONE &&
+	   SCp->sc_data_direction != DMA_BIDIRECTIONAL) {
+		if(SCp->use_sg) {
+			dma_unmap_sg(hostdata->dev, SCp->buffer,
+				     SCp->use_sg, SCp->sc_data_direction);
+		} else {
+			dma_unmap_single(hostdata->dev, slot->dma_handle,
+					 SCp->request_bufflen,
+					 SCp->sc_data_direction);
+		}
+	}
+}
+
+STATIC inline void
+NCR_700_scsi_done(struct NCR_700_Host_Parameters *hostdata,
+	       struct scsi_cmnd *SCp, int result)
+{
+	hostdata->state = NCR_700_HOST_FREE;
+	hostdata->cmd = NULL;
+
+	if(SCp != NULL) {
+		struct NCR_700_command_slot *slot = 
+			(struct NCR_700_command_slot *)SCp->host_scribble;
+		
+		NCR_700_unmap(hostdata, SCp, slot);
+		dma_unmap_single(hostdata->dev, slot->pCmd,
+				 sizeof(SCp->cmnd), DMA_TO_DEVICE);
+		if(SCp->cmnd[0] == REQUEST_SENSE && SCp->cmnd[6] == NCR_700_INTERNAL_SENSE_MAGIC) {
+#ifdef NCR_700_DEBUG
+			printk(" ORIGINAL CMD %p RETURNED %d, new return is %d sense is\n",
+			       SCp, SCp->cmnd[7], result);
+			scsi_print_sense("53c700", SCp);
+
+#endif
+			/* restore the old result if the request sense was
+			 * successful */
+			if(result == 0)
+				result = SCp->cmnd[7];
+			/* now restore the original command */
+			memcpy((void *) SCp->cmnd, (void *) SCp->data_cmnd,
+			       sizeof(SCp->data_cmnd));
+			SCp->request_buffer = SCp->buffer;
+			SCp->request_bufflen = SCp->bufflen;
+			SCp->use_sg = SCp->old_use_sg;
+			SCp->cmd_len = SCp->old_cmd_len;
+			SCp->sc_data_direction = SCp->sc_old_data_direction;
+			SCp->underflow = SCp->old_underflow;
+			
+		}
+		free_slot(slot, hostdata);
+#ifdef NCR_700_DEBUG
+		if(NCR_700_get_depth(SCp->device) == 0 ||
+		   NCR_700_get_depth(SCp->device) > SCp->device->queue_depth)
+			printk(KERN_ERR "Invalid depth in NCR_700_scsi_done(): %d\n",
+			       NCR_700_get_depth(SCp->device));
+#endif /* NCR_700_DEBUG */
+		NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) - 1);
+
+		SCp->host_scribble = NULL;
+		SCp->result = result;
+		SCp->scsi_done(SCp);
+	} else {
+		printk(KERN_ERR "53c700: SCSI DONE HAS NULL SCp\n");
+	}
+}
+
+
+STATIC void
+NCR_700_internal_bus_reset(struct Scsi_Host *host)
+{
+	/* Bus reset */
+	NCR_700_writeb(ASSERT_RST, host, SCNTL1_REG);
+	udelay(50);
+	NCR_700_writeb(0, host, SCNTL1_REG);
+
+}
+
+STATIC void
+NCR_700_chip_setup(struct Scsi_Host *host)
+{
+	struct NCR_700_Host_Parameters *hostdata = 
+		(struct NCR_700_Host_Parameters *)host->hostdata[0];
+	__u32 dcntl_extra = 0;
+	__u8 min_period;
+	__u8 min_xferp = (hostdata->chip710 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
+
+	if(hostdata->chip710) {
+		__u8 burst_disable = hostdata->burst_disable
+			? BURST_DISABLE : 0;
+		dcntl_extra = COMPAT_700_MODE;
+
+		NCR_700_writeb(dcntl_extra, host, DCNTL_REG);
+		NCR_700_writeb(BURST_LENGTH_8  | hostdata->dmode_extra,
+			       host, DMODE_710_REG);
+		NCR_700_writeb(burst_disable | (hostdata->differential ? 
+						DIFF : 0), host, CTEST7_REG);
+		NCR_700_writeb(BTB_TIMER_DISABLE, host, CTEST0_REG);
+		NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY | PARITY
+			       | AUTO_ATN, host, SCNTL0_REG);
+	} else {
+		NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra,
+			       host, DMODE_700_REG);
+		NCR_700_writeb(hostdata->differential ? 
+			       DIFF : 0, host, CTEST7_REG);
+		if(hostdata->fast) {
+			/* this is for 700-66, does nothing on 700 */
+			NCR_700_writeb(LAST_DIS_ENBL | ENABLE_ACTIVE_NEGATION 
+				       | GENERATE_RECEIVE_PARITY, host,
+				       CTEST8_REG);
+		} else {
+			NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY
+				       | PARITY | AUTO_ATN, host, SCNTL0_REG);
+		}
+	}
+
+	NCR_700_writeb(1 << host->this_id, host, SCID_REG);
+	NCR_700_writeb(0, host, SBCL_REG);
+	NCR_700_writeb(ASYNC_OPERATION, host, SXFER_REG);
+
+	NCR_700_writeb(PHASE_MM_INT | SEL_TIMEOUT_INT | GROSS_ERR_INT | UX_DISC_INT
+	     | RST_INT | PAR_ERR_INT | SELECT_INT, host, SIEN_REG);
+
+	NCR_700_writeb(ABORT_INT | INT_INST_INT | ILGL_INST_INT, host, DIEN_REG);
+	NCR_700_writeb(ENABLE_SELECT, host, SCNTL1_REG);
+	if(hostdata->clock > 75) {
+		printk(KERN_ERR "53c700: Clock speed %dMHz is too high: 75Mhz is the maximum this chip can be driven at\n", hostdata->clock);
+		/* do the best we can, but the async clock will be out
+		 * of spec: sync divider 2, async divider 3 */
+		DEBUG(("53c700: sync 2 async 3\n"));
+		NCR_700_writeb(SYNC_DIV_2_0, host, SBCL_REG);
+		NCR_700_writeb(ASYNC_DIV_3_0 | dcntl_extra, host, DCNTL_REG);
+		hostdata->sync_clock = hostdata->clock/2;
+	} else	if(hostdata->clock > 50  && hostdata->clock <= 75) {
+		/* sync divider 1.5, async divider 3 */
+		DEBUG(("53c700: sync 1.5 async 3\n"));
+		NCR_700_writeb(SYNC_DIV_1_5, host, SBCL_REG);
+		NCR_700_writeb(ASYNC_DIV_3_0 | dcntl_extra, host, DCNTL_REG);
+		hostdata->sync_clock = hostdata->clock*2;
+		hostdata->sync_clock /= 3;
+		
+	} else if(hostdata->clock > 37 && hostdata->clock <= 50) {
+		/* sync divider 1, async divider 2 */
+		DEBUG(("53c700: sync 1 async 2\n"));
+		NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
+		NCR_700_writeb(ASYNC_DIV_2_0 | dcntl_extra, host, DCNTL_REG);
+		hostdata->sync_clock = hostdata->clock;
+	} else if(hostdata->clock > 25 && hostdata->clock <=37) {
+		/* sync divider 1, async divider 1.5 */
+		DEBUG(("53c700: sync 1 async 1.5\n"));
+		NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
+		NCR_700_writeb(ASYNC_DIV_1_5 | dcntl_extra, host, DCNTL_REG);
+		hostdata->sync_clock = hostdata->clock;
+	} else {
+		DEBUG(("53c700: sync 1 async 1\n"));
+		NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
+		NCR_700_writeb(ASYNC_DIV_1_0 | dcntl_extra, host, DCNTL_REG);
+		/* sync divider 1, async divider 1 */
+		hostdata->sync_clock = hostdata->clock;
+	}
+	/* Calculate the actual minimum period that can be supported
+	 * by our synchronous clock speed.  See the 710 manual for
+	 * exact details of this calculation which is based on a
+	 * setting of the SXFER register */
+	min_period = 1000*(4+min_xferp)/(4*hostdata->sync_clock);
+	hostdata->min_period = NCR_700_MIN_PERIOD;
+	if(min_period > NCR_700_MIN_PERIOD)
+		hostdata->min_period = min_period;
+}
+
+STATIC void
+NCR_700_chip_reset(struct Scsi_Host *host)
+{
+	struct NCR_700_Host_Parameters *hostdata = 
+		(struct NCR_700_Host_Parameters *)host->hostdata[0];
+	if(hostdata->chip710) {
+		NCR_700_writeb(SOFTWARE_RESET_710, host, ISTAT_REG);
+		udelay(100);
+
+		NCR_700_writeb(0, host, ISTAT_REG);
+	} else {
+		NCR_700_writeb(SOFTWARE_RESET, host, DCNTL_REG);
+		udelay(100);
+		
+		NCR_700_writeb(0, host, DCNTL_REG);
+	}
+
+	mdelay(1000);
+
+	NCR_700_chip_setup(host);
+}
+
+/* The heart of the message processing engine is that the instruction
+ * immediately after the INT is the normal case (and so must be CLEAR
+ * ACK).  If we want to do something else, we call that routine in
+ * scripts and set temp to be the normal case + 8 (skipping the CLEAR
+ * ACK) so that the routine returns correctly to resume its activity
+ * */
+STATIC __u32
+process_extended_message(struct Scsi_Host *host, 
+			 struct NCR_700_Host_Parameters *hostdata,
+			 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
+{
+	__u32 resume_offset = dsp, temp = dsp + 8;
+	__u8 pun = 0xff, lun = 0xff;
+
+	if(SCp != NULL) {
+		pun = SCp->device->id;
+		lun = SCp->device->lun;
+	}
+
+	switch(hostdata->msgin[2]) {
+	case A_SDTR_MSG:
+		if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
+			struct scsi_target *starget = SCp->device->sdev_target;
+			__u8 period = hostdata->msgin[3];
+			__u8 offset = hostdata->msgin[4];
+
+			if(offset == 0 || period == 0) {
+				offset = 0;
+				period = 0;
+			}
+
+			spi_offset(starget) = offset;
+			spi_period(starget) = period;
+			
+			if(NCR_700_is_flag_set(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION)) {
+				spi_display_xfer_agreement(starget);
+				NCR_700_clear_flag(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION);
+			}
+			
+			NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
+			NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
+			
+			NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
+				       host, SXFER_REG);
+
+		} else {
+			/* SDTR message out of the blue, reject it */
+			printk(KERN_WARNING "scsi%d Unexpected SDTR msg\n",
+			       host->host_no);
+			hostdata->msgout[0] = A_REJECT_MSG;
+			dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
+			script_patch_16(hostdata->script, MessageCount, 1);
+			/* SendMsgOut returns, so set up the return
+			 * address */
+			resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
+		}
+		break;
+	
+	case A_WDTR_MSG:
+		printk(KERN_INFO "scsi%d: (%d:%d), Unsolicited WDTR after CMD, Rejecting\n",
+		       host->host_no, pun, lun);
+		hostdata->msgout[0] = A_REJECT_MSG;
+		dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
+		script_patch_16(hostdata->script, MessageCount, 1);
+		resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
+
+		break;
+
+	default:
+		printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
+		       host->host_no, pun, lun,
+		       NCR_700_phase[(dsps & 0xf00) >> 8]);
+		scsi_print_msg(hostdata->msgin);
+		printk("\n");
+		/* just reject it */
+		hostdata->msgout[0] = A_REJECT_MSG;
+		dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
+		script_patch_16(hostdata->script, MessageCount, 1);
+		/* SendMsgOut returns, so set up the return
+		 * address */
+		resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
+	}
+	NCR_700_writel(temp, host, TEMP_REG);
+	return resume_offset;
+}
+
+STATIC __u32
+process_message(struct Scsi_Host *host,	struct NCR_700_Host_Parameters *hostdata,
+		struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
+{
+	/* work out where to return to */
+	__u32 temp = dsp + 8, resume_offset = dsp;
+	__u8 pun = 0xff, lun = 0xff;
+
+	if(SCp != NULL) {
+		pun = SCp->device->id;
+		lun = SCp->device->lun;
+	}
+
+#ifdef NCR_700_DEBUG
+	printk("scsi%d (%d:%d): message %s: ", host->host_no, pun, lun,
+	       NCR_700_phase[(dsps & 0xf00) >> 8]);
+	scsi_print_msg(hostdata->msgin);
+	printk("\n");
+#endif
+
+	switch(hostdata->msgin[0]) {
+
+	case A_EXTENDED_MSG:
+		resume_offset =  process_extended_message(host, hostdata, SCp,
+							  dsp, dsps);
+		break;
+
+	case A_REJECT_MSG:
+		if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
+			/* Rejected our sync negotiation attempt */
+			spi_period(SCp->device->sdev_target) =
+				spi_offset(SCp->device->sdev_target) = 0;
+			NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
+			NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
+		} else if(SCp != NULL && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION) {
+			/* rejected our first simple tag message */
+			printk(KERN_WARNING "scsi%d (%d:%d) Rejected first tag queue attempt, turning off tag queueing\n", host->host_no, pun, lun);
+			/* we're done negotiating */
+			NCR_700_set_tag_neg_state(SCp->device, NCR_700_FINISHED_TAG_NEGOTIATION);
+			hostdata->tag_negotiated &= ~(1<<SCp->device->id);
+			SCp->device->tagged_supported = 0;
+			scsi_deactivate_tcq(SCp->device, host->cmd_per_lun);
+		} else {
+			printk(KERN_WARNING "scsi%d (%d:%d) Unexpected REJECT Message %s\n",
+			       host->host_no, pun, lun,
+			       NCR_700_phase[(dsps & 0xf00) >> 8]);
+			/* however, just ignore it */
+		}
+		break;
+
+	case A_PARITY_ERROR_MSG:
+		printk(KERN_ERR "scsi%d (%d:%d) Parity Error!\n", host->host_no,
+		       pun, lun);
+		NCR_700_internal_bus_reset(host);
+		break;
+	case A_SIMPLE_TAG_MSG:
+		printk(KERN_INFO "scsi%d (%d:%d) SIMPLE TAG %d %s\n", host->host_no,
+		       pun, lun, hostdata->msgin[1],
+		       NCR_700_phase[(dsps & 0xf00) >> 8]);
+		/* just ignore it */
+		break;
+	default:
+		printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
+		       host->host_no, pun, lun,
+		       NCR_700_phase[(dsps & 0xf00) >> 8]);
+
+		scsi_print_msg(hostdata->msgin);
+		printk("\n");
+		/* just reject it */
+		hostdata->msgout[0] = A_REJECT_MSG;
+		dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
+		script_patch_16(hostdata->script, MessageCount, 1);
+		/* SendMsgOut returns, so set up the return
+		 * address */
+		resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
+
+		break;
+	}
+	NCR_700_writel(temp, host, TEMP_REG);
+	/* set us up to receive another message */
+	dma_cache_sync(hostdata->msgin, MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
+	return resume_offset;
+}
+
+STATIC __u32
+process_script_interrupt(__u32 dsps, __u32 dsp, struct scsi_cmnd *SCp,
+			 struct Scsi_Host *host,
+			 struct NCR_700_Host_Parameters *hostdata)
+{
+	__u32 resume_offset = 0;
+	__u8 pun = 0xff, lun=0xff;
+
+	if(SCp != NULL) {
+		pun = SCp->device->id;
+		lun = SCp->device->lun;
+	}
+
+	if(dsps == A_GOOD_STATUS_AFTER_STATUS) {
+		DEBUG(("  COMMAND COMPLETE, status=%02x\n",
+		       hostdata->status[0]));
+		/* OK, if TCQ still under negotiation, we now know it works */
+		if (NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION)
+			NCR_700_set_tag_neg_state(SCp->device,
+						  NCR_700_FINISHED_TAG_NEGOTIATION);
+			
+		/* check for contingent allegiance contitions */
+		if(status_byte(hostdata->status[0]) == CHECK_CONDITION ||
+		   status_byte(hostdata->status[0]) == COMMAND_TERMINATED) {
+			struct NCR_700_command_slot *slot =
+				(struct NCR_700_command_slot *)SCp->host_scribble;
+			if(SCp->cmnd[0] == REQUEST_SENSE) {
+				/* OOPS: bad device, returning another
+				 * contingent allegiance condition */
+				printk(KERN_ERR "scsi%d (%d:%d) broken device is looping in contingent allegiance: ignoring\n", host->host_no, pun, lun);
+				NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
+			} else {
+#ifdef NCR_DEBUG
+				scsi_print_command(SCp);
+				printk("  cmd %p has status %d, requesting sense\n",
+				       SCp, hostdata->status[0]);
+#endif
+				/* we can destroy the command here
+				 * because the contingent allegiance
+				 * condition will cause a retry which
+				 * will re-copy the command from the
+				 * saved data_cmnd.  We also unmap any
+				 * data associated with the command
+				 * here */
+				NCR_700_unmap(hostdata, SCp, slot);
+
+				SCp->cmnd[0] = REQUEST_SENSE;
+				SCp->cmnd[1] = (SCp->device->lun & 0x7) << 5;
+				SCp->cmnd[2] = 0;
+				SCp->cmnd[3] = 0;
+				SCp->cmnd[4] = sizeof(SCp->sense_buffer);
+				SCp->cmnd[5] = 0;
+				SCp->cmd_len = 6;
+				/* Here's a quiet hack: the
+				 * REQUEST_SENSE command is six bytes,
+				 * so store a flag indicating that
+				 * this was an internal sense request
+				 * and the original status at the end
+				 * of the command */
+				SCp->cmnd[6] = NCR_700_INTERNAL_SENSE_MAGIC;
+				SCp->cmnd[7] = hostdata->status[0];
+				SCp->use_sg = 0;
+				SCp->sc_data_direction = DMA_FROM_DEVICE;
+				dma_sync_single_for_device(hostdata->dev, slot->pCmd,
+							   SCp->cmd_len, DMA_TO_DEVICE);
+				SCp->request_bufflen = sizeof(SCp->sense_buffer);
+				slot->dma_handle = dma_map_single(hostdata->dev, SCp->sense_buffer, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE);
+				slot->SG[0].ins = bS_to_host(SCRIPT_MOVE_DATA_IN | sizeof(SCp->sense_buffer));
+				slot->SG[0].pAddr = bS_to_host(slot->dma_handle);
+				slot->SG[1].ins = bS_to_host(SCRIPT_RETURN);
+				slot->SG[1].pAddr = 0;
+				slot->resume_offset = hostdata->pScript;
+				dma_cache_sync(slot->SG, sizeof(slot->SG[0])*2, DMA_TO_DEVICE);
+				dma_cache_sync(SCp->sense_buffer, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE);
+				
+				/* queue the command for reissue */
+				slot->state = NCR_700_SLOT_QUEUED;
+				hostdata->state = NCR_700_HOST_FREE;
+				hostdata->cmd = NULL;
+			}
+		} else {
+			// Currently rely on the mid layer evaluation
+			// of the tag queuing capability
+			//
+			//if(status_byte(hostdata->status[0]) == GOOD &&
+			//   SCp->cmnd[0] == INQUIRY && SCp->use_sg == 0) {
+			//	/* Piggy back the tag queueing support
+			//	 * on this command */
+			//	dma_sync_single_for_cpu(hostdata->dev,
+			//			    slot->dma_handle,
+			//			    SCp->request_bufflen,
+			//			    DMA_FROM_DEVICE);
+			//	if(((char *)SCp->request_buffer)[7] & 0x02) {
+			//		printk(KERN_INFO "scsi%d: (%d:%d) Enabling Tag Command Queuing\n", host->host_no, pun, lun);
+			//		hostdata->tag_negotiated |= (1<<SCp->device->id);
+			//		NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
+			//	} else {
+			//		NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
+			//		hostdata->tag_negotiated &= ~(1<<SCp->device->id);
+			//	}
+			//}
+			NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
+		}
+	} else if((dsps & 0xfffff0f0) == A_UNEXPECTED_PHASE) {
+		__u8 i = (dsps & 0xf00) >> 8;
+
+		printk(KERN_ERR "scsi%d: (%d:%d), UNEXPECTED PHASE %s (%s)\n",
+		       host->host_no, pun, lun,
+		       NCR_700_phase[i],
+		       sbcl_to_string(NCR_700_readb(host, SBCL_REG)));
+		printk(KERN_ERR "         len = %d, cmd =", SCp->cmd_len);
+		scsi_print_command(SCp);
+
+		NCR_700_internal_bus_reset(host);
+	} else if((dsps & 0xfffff000) == A_FATAL) {
+		int i = (dsps & 0xfff);
+
+		printk(KERN_ERR "scsi%d: (%d:%d) FATAL ERROR: %s\n",
+		       host->host_no, pun, lun, NCR_700_fatal_messages[i]);
+		if(dsps == A_FATAL_ILLEGAL_MSG_LENGTH) {
+			printk(KERN_ERR "     msg begins %02x %02x\n",
+			       hostdata->msgin[0], hostdata->msgin[1]);
+		}
+		NCR_700_internal_bus_reset(host);
+	} else if((dsps & 0xfffff0f0) == A_DISCONNECT) {
+#ifdef NCR_700_DEBUG
+		__u8 i = (dsps & 0xf00) >> 8;
+
+		printk("scsi%d: (%d:%d), DISCONNECTED (%d) %s\n",
+		       host->host_no, pun, lun,
+		       i, NCR_700_phase[i]);
+#endif
+		save_for_reselection(hostdata, SCp, dsp);
+
+	} else if(dsps == A_RESELECTION_IDENTIFIED) {
+		__u8 lun;
+		struct NCR_700_command_slot *slot;
+		__u8 reselection_id = hostdata->reselection_id;
+		struct scsi_device *SDp;
+
+		lun = hostdata->msgin[0] & 0x1f;
+
+		hostdata->reselection_id = 0xff;
+		DEBUG(("scsi%d: (%d:%d) RESELECTED!\n",
+		       host->host_no, reselection_id, lun));
+		/* clear the reselection indicator */
+		SDp = __scsi_device_lookup(host, 0, reselection_id, lun);
+		if(unlikely(SDp == NULL)) {
+			printk(KERN_ERR "scsi%d: (%d:%d) HAS NO device\n",
+			       host->host_no, reselection_id, lun);
+			BUG();
+		}
+		if(hostdata->msgin[1] == A_SIMPLE_TAG_MSG) {
+			struct scsi_cmnd *SCp = scsi_find_tag(SDp, hostdata->msgin[2]);
+			if(unlikely(SCp == NULL)) {
+				printk(KERN_ERR "scsi%d: (%d:%d) no saved request for tag %d\n", 
+				       host->host_no, reselection_id, lun, hostdata->msgin[2]);
+				BUG();
+			}
+
+			slot = (struct NCR_700_command_slot *)SCp->host_scribble;
+			DEBUG(("53c700: %d:%d:%d, reselection is tag %d, slot %p(%d)\n",
+			       host->host_no, SDp->id, SDp->lun,
+			       hostdata->msgin[2], slot, slot->tag));
+		} else {
+			struct scsi_cmnd *SCp = scsi_find_tag(SDp, SCSI_NO_TAG);
+			if(unlikely(SCp == NULL)) {
+				printk(KERN_ERR "scsi%d: (%d:%d) no saved request for untagged cmd\n", 
+				       host->host_no, reselection_id, lun);
+				BUG();
+			}
+			slot = (struct NCR_700_command_slot *)SCp->host_scribble;
+		}
+
+		if(slot == NULL) {
+			printk(KERN_ERR "scsi%d: (%d:%d) RESELECTED but no saved command (MSG = %02x %02x %02x)!!\n",
+			       host->host_no, reselection_id, lun,
+			       hostdata->msgin[0], hostdata->msgin[1],
+			       hostdata->msgin[2]);
+		} else {
+			if(hostdata->state != NCR_700_HOST_BUSY)
+				printk(KERN_ERR "scsi%d: FATAL, host not busy during valid reselection!\n",
+				       host->host_no);
+			resume_offset = slot->resume_offset;
+			hostdata->cmd = slot->cmnd;
+
+			/* re-patch for this command */
+			script_patch_32_abs(hostdata->script, CommandAddress, 
+					    slot->pCmd);
+			script_patch_16(hostdata->script,
+					CommandCount, slot->cmnd->cmd_len);
+			script_patch_32_abs(hostdata->script, SGScriptStartAddress,
+					    to32bit(&slot->pSG[0].ins));
+
+			/* Note: setting SXFER only works if we're
+			 * still in the MESSAGE phase, so it is vital
+			 * that ACK is still asserted when we process
+			 * the reselection message.  The resume offset
+			 * should therefore always clear ACK */
+			NCR_700_writeb(NCR_700_get_SXFER(hostdata->cmd->device),
+				       host, SXFER_REG);
+			dma_cache_sync(hostdata->msgin,
+				       MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
+			dma_cache_sync(hostdata->msgout,
+				       MSG_ARRAY_SIZE, DMA_TO_DEVICE);
+			/* I'm just being paranoid here, the command should
+			 * already have been flushed from the cache */
+			dma_cache_sync(slot->cmnd->cmnd,
+				       slot->cmnd->cmd_len, DMA_TO_DEVICE);
+
+
+			
+		}
+	} else if(dsps == A_RESELECTED_DURING_SELECTION) {
+
+		/* This section is full of debugging code because I've
+		 * never managed to reach it.  I think what happens is
+		 * that, because the 700 runs with selection
+		 * interrupts enabled the whole time that we take a
+		 * selection interrupt before we manage to get to the
+		 * reselected script interrupt */
+
+		__u8 reselection_id = NCR_700_readb(host, SFBR_REG);
+		struct NCR_700_command_slot *slot;
+		
+		/* Take out our own ID */
+		reselection_id &= ~(1<<host->this_id);
+		
+		/* I've never seen this happen, so keep this as a printk rather
+		 * than a debug */
+		printk(KERN_INFO "scsi%d: (%d:%d) RESELECTION DURING SELECTION, dsp=%08x[%04x] state=%d, count=%d\n",
+		       host->host_no, reselection_id, lun, dsp, dsp - hostdata->pScript, hostdata->state, hostdata->command_slot_count);
+
+		{
+			/* FIXME: DEBUGGING CODE */
+			__u32 SG = (__u32)bS_to_cpu(hostdata->script[A_SGScriptStartAddress_used[0]]);
+			int i;
+
+			for(i=0; i< NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
+				if(SG >= to32bit(&hostdata->slots[i].pSG[0])
+				   && SG <= to32bit(&hostdata->slots[i].pSG[NCR_700_SG_SEGMENTS]))
+					break;
+			}
+			printk(KERN_INFO "IDENTIFIED SG segment as being %08x in slot %p, cmd %p, slot->resume_offset=%08x\n", SG, &hostdata->slots[i], hostdata->slots[i].cmnd, hostdata->slots[i].resume_offset);
+			SCp =  hostdata->slots[i].cmnd;
+		}
+
+		if(SCp != NULL) {
+			slot = (struct NCR_700_command_slot *)SCp->host_scribble;
+			/* change slot from busy to queued to redo command */
+			slot->state = NCR_700_SLOT_QUEUED;
+		}
+		hostdata->cmd = NULL;
+		
+		if(reselection_id == 0) {
+			if(hostdata->reselection_id == 0xff) {
+				printk(KERN_ERR "scsi%d: Invalid reselection during selection!!\n", host->host_no);
+				return 0;
+			} else {
+				printk(KERN_ERR "scsi%d: script reselected and we took a selection interrupt\n",
+				       host->host_no);
+				reselection_id = hostdata->reselection_id;
+			}
+		} else {
+			
+			/* convert to real ID */
+			reselection_id = bitmap_to_number(reselection_id);
+		}
+		hostdata->reselection_id = reselection_id;
+		/* just in case we have a stale simple tag message, clear it */
+		hostdata->msgin[1] = 0;
+		dma_cache_sync(hostdata->msgin,
+			       MSG_ARRAY_SIZE, DMA_BIDIRECTIONAL);
+		if(hostdata->tag_negotiated & (1<<reselection_id)) {
+			resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
+		} else {
+			resume_offset = hostdata->pScript + Ent_GetReselectionData;
+		}
+	} else if(dsps == A_COMPLETED_SELECTION_AS_TARGET) {
+		/* we've just disconnected from the bus, do nothing since
+		 * a return here will re-run the queued command slot
+		 * that may have been interrupted by the initial selection */
+		DEBUG((" SELECTION COMPLETED\n"));
+	} else if((dsps & 0xfffff0f0) == A_MSG_IN) { 
+		resume_offset = process_message(host, hostdata, SCp,
+						dsp, dsps);
+	} else if((dsps &  0xfffff000) == 0) {
+		__u8 i = (dsps & 0xf0) >> 4, j = (dsps & 0xf00) >> 8;
+		printk(KERN_ERR "scsi%d: (%d:%d), unhandled script condition %s %s at %04x\n",
+		       host->host_no, pun, lun, NCR_700_condition[i],
+		       NCR_700_phase[j], dsp - hostdata->pScript);
+		if(SCp != NULL) {
+			scsi_print_command(SCp);
+
+			if(SCp->use_sg) {
+				for(i = 0; i < SCp->use_sg + 1; i++) {
+					printk(KERN_INFO " SG[%d].length = %d, move_insn=%08x, addr %08x\n", i, ((struct scatterlist *)SCp->buffer)[i].length, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].ins, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].pAddr);
+				}
+			}
+		}	       
+		NCR_700_internal_bus_reset(host);
+	} else if((dsps & 0xfffff000) == A_DEBUG_INTERRUPT) {
+		printk(KERN_NOTICE "scsi%d (%d:%d) DEBUG INTERRUPT %d AT %08x[%04x], continuing\n",
+		       host->host_no, pun, lun, dsps & 0xfff, dsp, dsp - hostdata->pScript);
+		resume_offset = dsp;
+	} else {
+		printk(KERN_ERR "scsi%d: (%d:%d), unidentified script interrupt 0x%x at %04x\n",
+		       host->host_no, pun, lun, dsps, dsp - hostdata->pScript);
+		NCR_700_internal_bus_reset(host);
+	}
+	return resume_offset;
+}
+
+/* We run the 53c700 with selection interrupts always enabled.  This
+ * means that the chip may be selected as soon as the bus frees.  On a
+ * busy bus, this can be before the scripts engine finishes its
+ * processing.  Therefore, part of the selection processing has to be
+ * to find out what the scripts engine is doing and complete the
+ * function if necessary (i.e. process the pending disconnect or save
+ * the interrupted initial selection */
+STATIC inline __u32
+process_selection(struct Scsi_Host *host, __u32 dsp)
+{
+	__u8 id = 0;	/* Squash compiler warning */
+	int count = 0;
+	__u32 resume_offset = 0;
+	struct NCR_700_Host_Parameters *hostdata =
+		(struct NCR_700_Host_Parameters *)host->hostdata[0];
+	struct scsi_cmnd *SCp = hostdata->cmd;
+	__u8 sbcl;
+
+	for(count = 0; count < 5; count++) {
+		id = NCR_700_readb(host, hostdata->chip710 ?
+				   CTEST9_REG : SFBR_REG);
+
+		/* Take out our own ID */
+		id &= ~(1<<host->this_id);
+		if(id != 0) 
+			break;
+		udelay(5);
+	}
+	sbcl = NCR_700_readb(host, SBCL_REG);
+	if((sbcl & SBCL_IO) == 0) {
+		/* mark as having been selected rather than reselected */
+		id = 0xff;
+	} else {
+		/* convert to real ID */
+		hostdata->reselection_id = id = bitmap_to_number(id);
+		DEBUG(("scsi%d:  Reselected by %d\n",
+		       host->host_no, id));
+	}
+	if(hostdata->state == NCR_700_HOST_BUSY && SCp != NULL) {
+		struct NCR_700_command_slot *slot =
+			(struct NCR_700_command_slot *)SCp->host_scribble;
+		DEBUG(("  ID %d WARNING: RESELECTION OF BUSY HOST, saving cmd %p, slot %p, addr %x [%04x], resume %x!\n", id, hostdata->cmd, slot, dsp, dsp - hostdata->pScript, resume_offset));
+		
+		switch(dsp - hostdata->pScript) {
+		case Ent_Disconnect1:
+		case Ent_Disconnect2:
+			save_for_reselection(hostdata, SCp, Ent_Disconnect2 + hostdata->pScript);
+			break;
+		case Ent_Disconnect3:
+		case Ent_Disconnect4:
+			save_for_reselection(hostdata, SCp, Ent_Disconnect4 + hostdata->pScript);
+			break;
+		case Ent_Disconnect5:
+		case Ent_Disconnect6:
+			save_for_reselection(hostdata, SCp, Ent_Disconnect6 + hostdata->pScript);
+			break;
+		case Ent_Disconnect7:
+		case Ent_Disconnect8:
+			save_for_reselection(hostdata, SCp, Ent_Disconnect8 + hostdata->pScript);
+			break;
+		case Ent_Finish1:
+		case Ent_Finish2:
+			process_script_interrupt(A_GOOD_STATUS_AFTER_STATUS, dsp, SCp, host, hostdata);
+			break;
+			
+		default:
+			slot->state = NCR_700_SLOT_QUEUED;
+			break;
+			}
+	}
+	hostdata->state = NCR_700_HOST_BUSY;
+	hostdata->cmd = NULL;
+	/* clear any stale simple tag message */
+	hostdata->msgin[1] = 0;
+	dma_cache_sync(hostdata->msgin, MSG_ARRAY_SIZE,
+		       DMA_BIDIRECTIONAL);
+
+	if(id == 0xff) {
+		/* Selected as target, Ignore */
+		resume_offset = hostdata->pScript + Ent_SelectedAsTarget;
+	} else if(hostdata->tag_negotiated & (1<<id)) {
+		resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
+	} else {
+		resume_offset = hostdata->pScript + Ent_GetReselectionData;
+	}
+	return resume_offset;
+}
+
+static inline void
+NCR_700_clear_fifo(struct Scsi_Host *host) {
+	const struct NCR_700_Host_Parameters *hostdata
+		= (struct NCR_700_Host_Parameters *)host->hostdata[0];
+	if(hostdata->chip710) {
+		NCR_700_writeb(CLR_FIFO_710, host, CTEST8_REG);
+	} else {
+		NCR_700_writeb(CLR_FIFO, host, DFIFO_REG);
+	}
+}
+
+static inline void
+NCR_700_flush_fifo(struct Scsi_Host *host) {
+	const struct NCR_700_Host_Parameters *hostdata
+		= (struct NCR_700_Host_Parameters *)host->hostdata[0];
+	if(hostdata->chip710) {
+		NCR_700_writeb(FLUSH_DMA_FIFO_710, host, CTEST8_REG);
+		udelay(10);
+		NCR_700_writeb(0, host, CTEST8_REG);
+	} else {
+		NCR_700_writeb(FLUSH_DMA_FIFO, host, DFIFO_REG);
+		udelay(10);
+		NCR_700_writeb(0, host, DFIFO_REG);
+	}
+}
+
+
+/* The queue lock with interrupts disabled must be held on entry to
+ * this function */
+STATIC int
+NCR_700_start_command(struct scsi_cmnd *SCp)
+{
+	struct NCR_700_command_slot *slot =
+		(struct NCR_700_command_slot *)SCp->host_scribble;
+	struct NCR_700_Host_Parameters *hostdata =
+		(struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
+	__u16 count = 1;	/* for IDENTIFY message */
+	
+	if(hostdata->state != NCR_700_HOST_FREE) {
+		/* keep this inside the lock to close the race window where
+		 * the running command finishes on another CPU while we don't
+		 * change the state to queued on this one */
+		slot->state = NCR_700_SLOT_QUEUED;
+
+		DEBUG(("scsi%d: host busy, queueing command %p, slot %p\n",
+		       SCp->device->host->host_no, slot->cmnd, slot));
+		return 0;
+	}
+	hostdata->state = NCR_700_HOST_BUSY;
+	hostdata->cmd = SCp;
+	slot->state = NCR_700_SLOT_BUSY;
+	/* keep interrupts disabled until we have the command correctly
+	 * set up so we cannot take a selection interrupt */
+
+	hostdata->msgout[0] = NCR_700_identify(SCp->cmnd[0] != REQUEST_SENSE,
+					       SCp->device->lun);
+	/* for INQUIRY or REQUEST_SENSE commands, we cannot be sure
+	 * if the negotiated transfer parameters still hold, so
+	 * always renegotiate them */
+	if(SCp->cmnd[0] == INQUIRY || SCp->cmnd[0] == REQUEST_SENSE) {
+		NCR_700_clear_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
+	}
+
+	/* REQUEST_SENSE is asking for contingent I_T_L(_Q) status.
+	 * If a contingent allegiance condition exists, the device
+	 * will refuse all tags, so send the request sense as untagged
+	 * */
+	if((hostdata->tag_negotiated & (1<<SCp->device->id))
+	   && (slot->tag != SCSI_NO_TAG && SCp->cmnd[0] != REQUEST_SENSE)) {
+		count += scsi_populate_tag_msg(SCp, &hostdata->msgout[count]);
+	}
+
+	if(hostdata->fast &&
+	   NCR_700_is_flag_clear(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC)) {
+		memcpy(&hostdata->msgout[count], NCR_700_SDTR_msg,
+		       sizeof(NCR_700_SDTR_msg));
+		hostdata->msgout[count+3] = spi_period(SCp->device->sdev_target);
+		hostdata->msgout[count+4] = spi_offset(SCp->device->sdev_target);
+		count += sizeof(NCR_700_SDTR_msg);
+		NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
+	}
+
+	script_patch_16(hostdata->script, MessageCount, count);
+
+
+	script_patch_ID(hostdata->script,
+			Device_ID, 1<<SCp->device->id);
+
+	script_patch_32_abs(hostdata->script, CommandAddress, 
+			    slot->pCmd);
+	script_patch_16(hostdata->script, CommandCount, SCp->cmd_len);
+	/* finally plumb the beginning of the SG list into the script
+	 * */
+	script_patch_32_abs(hostdata->script, SGScriptStartAddress,
+			    to32bit(&slot->pSG[0].ins));
+	NCR_700_clear_fifo(SCp->device->host);
+
+	if(slot->resume_offset == 0)
+		slot->resume_offset = hostdata->pScript;
+	/* now perform all the writebacks and invalidates */
+	dma_cache_sync(hostdata->msgout, count, DMA_TO_DEVICE);
+	dma_cache_sync(hostdata->msgin, MSG_ARRAY_SIZE,
+		       DMA_FROM_DEVICE);
+	dma_cache_sync(SCp->cmnd, SCp->cmd_len, DMA_TO_DEVICE);
+	dma_cache_sync(hostdata->status, 1, DMA_FROM_DEVICE);
+
+	/* set the synchronous period/offset */
+	NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
+		       SCp->device->host, SXFER_REG);
+	NCR_700_writel(slot->temp, SCp->device->host, TEMP_REG);
+	NCR_700_writel(slot->resume_offset, SCp->device->host, DSP_REG);
+
+	return 1;
+}
+
+irqreturn_t
+NCR_700_intr(int irq, void *dev_id, struct pt_regs *regs)
+{
+	struct Scsi_Host *host = (struct Scsi_Host *)dev_id;
+	struct NCR_700_Host_Parameters *hostdata =
+		(struct NCR_700_Host_Parameters *)host->hostdata[0];
+	__u8 istat;
+	__u32 resume_offset = 0;
+	__u8 pun = 0xff, lun = 0xff;
+	unsigned long flags;
+	int handled = 0;
+
+	/* Use the host lock to serialise acess to the 53c700
+	 * hardware.  Note: In future, we may need to take the queue
+	 * lock to enter the done routines.  When that happens, we
+	 * need to ensure that for this driver, the host lock and the
+	 * queue lock point to the same thing. */
+	spin_lock_irqsave(host->host_lock, flags);
+	if((istat = NCR_700_readb(host, ISTAT_REG))
+	      & (SCSI_INT_PENDING | DMA_INT_PENDING)) {
+		__u32 dsps;
+		__u8 sstat0 = 0, dstat = 0;
+		__u32 dsp;
+		struct scsi_cmnd *SCp = hostdata->cmd;
+		enum NCR_700_Host_State state;
+
+		handled = 1;
+		state = hostdata->state;
+		SCp = hostdata->cmd;
+
+		if(istat & SCSI_INT_PENDING) {
+			udelay(10);
+
+			sstat0 = NCR_700_readb(host, SSTAT0_REG);
+		}
+
+		if(istat & DMA_INT_PENDING) {
+			udelay(10);
+
+			dstat = NCR_700_readb(host, DSTAT_REG);
+		}
+
+		dsps = NCR_700_readl(host, DSPS_REG);
+		dsp = NCR_700_readl(host, DSP_REG);
+
+		DEBUG(("scsi%d: istat %02x sstat0 %02x dstat %02x dsp %04x[%08x] dsps 0x%x\n",
+		       host->host_no, istat, sstat0, dstat,
+		       (dsp - (__u32)(hostdata->pScript))/4,
+		       dsp, dsps));
+
+		if(SCp != NULL) {
+			pun = SCp->device->id;
+			lun = SCp->device->lun;
+		}
+
+		if(sstat0 & SCSI_RESET_DETECTED) {
+			struct scsi_device *SDp;
+			int i;
+
+			hostdata->state = NCR_700_HOST_BUSY;
+
+			printk(KERN_ERR "scsi%d: Bus Reset detected, executing command %p, slot %p, dsp %08x[%04x]\n",
+			       host->host_no, SCp, SCp == NULL ? NULL : SCp->host_scribble, dsp, dsp - hostdata->pScript);
+
+			scsi_report_bus_reset(host, 0);
+
+			/* clear all the negotiated parameters */
+			__shost_for_each_device(SDp, host)
+				SDp->hostdata = NULL;
+			
+			/* clear all the slots and their pending commands */
+			for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
+				struct scsi_cmnd *SCp;
+				struct NCR_700_command_slot *slot =
+					&hostdata->slots[i];
+
+				if(slot->state == NCR_700_SLOT_FREE)
+					continue;
+				
+				SCp = slot->cmnd;
+				printk(KERN_ERR " failing command because of reset, slot %p, cmnd %p\n",
+				       slot, SCp);
+				free_slot(slot, hostdata);
+				SCp->host_scribble = NULL;
+				NCR_700_set_depth(SCp->device, 0);
+				/* NOTE: deadlock potential here: we
+				 * rely on mid-layer guarantees that
+				 * scsi_done won't try to issue the
+				 * command again otherwise we'll
+				 * deadlock on the
+				 * hostdata->state_lock */
+				SCp->result = DID_RESET << 16;
+				SCp->scsi_done(SCp);
+			}
+			mdelay(25);
+			NCR_700_chip_setup(host);
+
+			hostdata->state = NCR_700_HOST_FREE;
+			hostdata->cmd = NULL;
+			/* signal back if this was an eh induced reset */
+			if(hostdata->eh_complete != NULL)
+				complete(hostdata->eh_complete);
+			goto out_unlock;
+		} else if(sstat0 & SELECTION_TIMEOUT) {
+			DEBUG(("scsi%d: (%d:%d) selection timeout\n",
+			       host->host_no, pun, lun));
+			NCR_700_scsi_done(hostdata, SCp, DID_NO_CONNECT<<16);
+		} else if(sstat0 & PHASE_MISMATCH) {
+			struct NCR_700_command_slot *slot = (SCp == NULL) ? NULL :
+				(struct NCR_700_command_slot *)SCp->host_scribble;
+
+			if(dsp == Ent_SendMessage + 8 + hostdata->pScript) {
+				/* It wants to reply to some part of
+				 * our message */
+#ifdef NCR_700_DEBUG
+				__u32 temp = NCR_700_readl(host, TEMP_REG);
+				int count = (hostdata->script[Ent_SendMessage/4] & 0xffffff) - ((NCR_700_readl(host, DBC_REG) & 0xffffff) + NCR_700_data_residual(host));
+				printk("scsi%d (%d:%d) PHASE MISMATCH IN SEND MESSAGE %d remain, return %p[%04x], phase %s\n", host->host_no, pun, lun, count, (void *)temp, temp - hostdata->pScript, sbcl_to_string(NCR_700_readb(host, SBCL_REG)));
+#endif
+				resume_offset = hostdata->pScript + Ent_SendMessagePhaseMismatch;
+			} else if(dsp >= to32bit(&slot->pSG[0].ins) &&
+				  dsp <= to32bit(&slot->pSG[NCR_700_SG_SEGMENTS].ins)) {
+				int data_transfer = NCR_700_readl(host, DBC_REG) & 0xffffff;
+				int SGcount = (dsp - to32bit(&slot->pSG[0].ins))/sizeof(struct NCR_700_SG_List);
+				int residual = NCR_700_data_residual(host);
+				int i;
+#ifdef NCR_700_DEBUG
+				__u32 naddr = NCR_700_readl(host, DNAD_REG);
+
+				printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x\n",
+				       host->host_no, pun, lun,
+				       SGcount, data_transfer);
+				scsi_print_command(SCp);
+				if(residual) {
+					printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x, residual %d\n",
+				       host->host_no, pun, lun,
+				       SGcount, data_transfer, residual);
+				}
+#endif
+				data_transfer += residual;
+
+				if(data_transfer != 0) {
+					int count; 
+					__u32 pAddr;
+
+					SGcount--;
+
+					count = (bS_to_cpu(slot->SG[SGcount].ins) & 0x00ffffff);
+					DEBUG(("DATA TRANSFER MISMATCH, count = %d, transferred %d\n", count, count-data_transfer));
+					slot->SG[SGcount].ins &= bS_to_host(0xff000000);
+					slot->SG[SGcount].ins |= bS_to_host(data_transfer);
+					pAddr = bS_to_cpu(slot->SG[SGcount].pAddr);
+					pAddr += (count - data_transfer);
+#ifdef NCR_700_DEBUG
+					if(pAddr != naddr) {
+						printk("scsi%d (%d:%d) transfer mismatch pAddr=%lx, naddr=%lx, data_transfer=%d, residual=%d\n", host->host_no, pun, lun, (unsigned long)pAddr, (unsigned long)naddr, data_transfer, residual);
+					}
+#endif
+					slot->SG[SGcount].pAddr = bS_to_host(pAddr);
+				}
+				/* set the executed moves to nops */
+				for(i=0; i<SGcount; i++) {
+					slot->SG[i].ins = bS_to_host(SCRIPT_NOP);
+					slot->SG[i].pAddr = 0;
+				}
+				dma_cache_sync(slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
+				/* and pretend we disconnected after
+				 * the command phase */
+				resume_offset = hostdata->pScript + Ent_MsgInDuringData;
+				/* make sure all the data is flushed */
+				NCR_700_flush_fifo(host);
+			} else {
+				__u8 sbcl = NCR_700_readb(host, SBCL_REG);
+				printk(KERN_ERR "scsi%d: (%d:%d) phase mismatch at %04x, phase %s\n",
+				       host->host_no, pun, lun, dsp - hostdata->pScript, sbcl_to_string(sbcl));
+				NCR_700_internal_bus_reset(host);
+			}
+
+		} else if(sstat0 & SCSI_GROSS_ERROR) {
+			printk(KERN_ERR "scsi%d: (%d:%d) GROSS ERROR\n",
+			       host->host_no, pun, lun);
+			NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
+		} else if(sstat0 & PARITY_ERROR) {
+			printk(KERN_ERR "scsi%d: (%d:%d) PARITY ERROR\n",
+			       host->host_no, pun, lun);
+			NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
+		} else if(dstat & SCRIPT_INT_RECEIVED) {
+			DEBUG(("scsi%d: (%d:%d) ====>SCRIPT INTERRUPT<====\n",
+			       host->host_no, pun, lun));
+			resume_offset = process_script_interrupt(dsps, dsp, SCp, host, hostdata);
+		} else if(dstat & (ILGL_INST_DETECTED)) {
+			printk(KERN_ERR "scsi%d: (%d:%d) Illegal Instruction detected at 0x%08x[0x%x]!!!\n"
+			       "         Please email James.Bottomley@HansenPartnership.com with the details\n",
+			       host->host_no, pun, lun,
+			       dsp, dsp - hostdata->pScript);
+			NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
+		} else if(dstat & (WATCH_DOG_INTERRUPT|ABORTED)) {
+			printk(KERN_ERR "scsi%d: (%d:%d) serious DMA problem, dstat=%02x\n",
+			       host->host_no, pun, lun, dstat);
+			NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
+		}
+
+		
+		/* NOTE: selection interrupt processing MUST occur
+		 * after script interrupt processing to correctly cope
+		 * with the case where we process a disconnect and
+		 * then get reselected before we process the
+		 * disconnection */
+		if(sstat0 & SELECTED) {
+			/* FIXME: It currently takes at least FOUR
+			 * interrupts to complete a command that
+			 * disconnects: one for the disconnect, one
+			 * for the reselection, one to get the
+			 * reselection data and one to complete the
+			 * command.  If we guess the reselected
+			 * command here and prepare it, we only need
+			 * to get a reselection data interrupt if we
+			 * guessed wrongly.  Since the interrupt
+			 * overhead is much greater than the command
+			 * setup, this would be an efficient
+			 * optimisation particularly as we probably
+			 * only have one outstanding command on a
+			 * target most of the time */
+
+			resume_offset = process_selection(host, dsp);
+
+		}
+
+	}
+
+	if(resume_offset) {
+		if(hostdata->state != NCR_700_HOST_BUSY) {
+			printk(KERN_ERR "scsi%d: Driver error: resume at 0x%08x [0x%04x] with non busy host!\n",
+			       host->host_no, resume_offset, resume_offset - hostdata->pScript);
+			hostdata->state = NCR_700_HOST_BUSY;
+		}
+
+		DEBUG(("Attempting to resume at %x\n", resume_offset));
+		NCR_700_clear_fifo(host);
+		NCR_700_writel(resume_offset, host, DSP_REG);
+	} 
+	/* There is probably a technical no-no about this: If we're a
+	 * shared interrupt and we got this interrupt because the
+	 * other device needs servicing not us, we're still going to
+	 * check our queued commands here---of course, there shouldn't
+	 * be any outstanding.... */
+	if(hostdata->state == NCR_700_HOST_FREE) {
+		int i;
+
+		for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
+			/* fairness: always run the queue from the last
+			 * position we left off */
+			int j = (i + hostdata->saved_slot_position)
+				% NCR_700_COMMAND_SLOTS_PER_HOST;
+			
+			if(hostdata->slots[j].state != NCR_700_SLOT_QUEUED)
+				continue;
+			if(NCR_700_start_command(hostdata->slots[j].cmnd)) {
+				DEBUG(("scsi%d: Issuing saved command slot %p, cmd %p\t\n",
+				       host->host_no, &hostdata->slots[j],
+				       hostdata->slots[j].cmnd));
+				hostdata->saved_slot_position = j + 1;
+			}
+
+			break;
+		}
+	}
+ out_unlock:
+	spin_unlock_irqrestore(host->host_lock, flags);
+	return IRQ_RETVAL(handled);
+}
+
+STATIC int
+NCR_700_queuecommand(struct scsi_cmnd *SCp, void (*done)(struct scsi_cmnd *))
+{
+	struct NCR_700_Host_Parameters *hostdata = 
+		(struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
+	__u32 move_ins;
+	enum dma_data_direction direction;
+	struct NCR_700_command_slot *slot;
+
+	if(hostdata->command_slot_count >= NCR_700_COMMAND_SLOTS_PER_HOST) {
+		/* We're over our allocation, this should never happen
+		 * since we report the max allocation to the mid layer */
+		printk(KERN_WARNING "scsi%d: Command depth has gone over queue depth\n", SCp->device->host->host_no);
+		return 1;
+	}
+	/* check for untagged commands.  We cannot have any outstanding
+	 * commands if we accept them.  Commands could be untagged because:
+	 *
+	 * - The tag negotiated bitmap is clear
+	 * - The blk layer sent and untagged command
+	 */
+	if(NCR_700_get_depth(SCp->device) != 0
+	   && (!(hostdata->tag_negotiated & (1<<SCp->device->id))
+	       || !blk_rq_tagged(SCp->request))) {
+		DEBUG((KERN_ERR "scsi%d (%d:%d) has non zero depth %d\n",
+		       SCp->device->host->host_no, SCp->device->id, SCp->device->lun,
+		       NCR_700_get_depth(SCp->device)));
+		return SCSI_MLQUEUE_DEVICE_BUSY;
+	}
+	if(NCR_700_get_depth(SCp->device) >= SCp->device->queue_depth) {
+		DEBUG((KERN_ERR "scsi%d (%d:%d) has max tag depth %d\n",
+		       SCp->device->host->host_no, SCp->device->id, SCp->device->lun,
+		       NCR_700_get_depth(SCp->device)));
+		return SCSI_MLQUEUE_DEVICE_BUSY;
+	}
+	NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) + 1);
+
+	/* begin the command here */
+	/* no need to check for NULL, test for command_slot_count above
+	 * ensures a slot is free */
+	slot = find_empty_slot(hostdata);
+
+	slot->cmnd = SCp;
+
+	SCp->scsi_done = done;
+	SCp->host_scribble = (unsigned char *)slot;
+	SCp->SCp.ptr = NULL;
+	SCp->SCp.buffer = NULL;
+
+#ifdef NCR_700_DEBUG
+	printk("53c700: scsi%d, command ", SCp->device->host->host_no);
+	scsi_print_command(SCp);
+#endif
+	if(blk_rq_tagged(SCp->request)
+	   && (hostdata->tag_negotiated &(1<<SCp->device->id)) == 0
+	   && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_START_TAG_NEGOTIATION) {
+		printk(KERN_ERR "scsi%d: (%d:%d) Enabling Tag Command Queuing\n", SCp->device->host->host_no, SCp->device->id, SCp->device->lun);
+		hostdata->tag_negotiated |= (1<<SCp->device->id);
+		NCR_700_set_tag_neg_state(SCp->device, NCR_700_DURING_TAG_NEGOTIATION);
+	}
+
+	/* here we may have to process an untagged command.  The gate
+	 * above ensures that this will be the only one outstanding,
+	 * so clear the tag negotiated bit.
+	 *
+	 * FIXME: This will royally screw up on multiple LUN devices
+	 * */
+	if(!blk_rq_tagged(SCp->request)
+	   && (hostdata->tag_negotiated &(1<<SCp->device->id))) {
+		printk(KERN_INFO "scsi%d: (%d:%d) Disabling Tag Command Queuing\n", SCp->device->host->host_no, SCp->device->id, SCp->device->lun);
+		hostdata->tag_negotiated &= ~(1<<SCp->device->id);
+	}
+
+	if((hostdata->tag_negotiated &(1<<SCp->device->id))
+	   && scsi_get_tag_type(SCp->device)) {
+		slot->tag = SCp->request->tag;
+		DEBUG(("53c700 %d:%d:%d, sending out tag %d, slot %p\n",
+		       SCp->device->host->host_no, SCp->device->id, SCp->device->lun, slot->tag,
+		       slot));
+	} else {
+		slot->tag = SCSI_NO_TAG;
+		/* must populate current_cmnd for scsi_find_tag to work */
+		SCp->device->current_cmnd = SCp;
+	}
+	/* sanity check: some of the commands generated by the mid-layer
+	 * have an eccentric idea of their sc_data_direction */
+	if(!SCp->use_sg && !SCp->request_bufflen 
+	   && SCp->sc_data_direction != DMA_NONE) {
+#ifdef NCR_700_DEBUG
+		printk("53c700: Command");
+		scsi_print_command(SCp);
+		printk("Has wrong data direction %d\n", SCp->sc_data_direction);
+#endif
+		SCp->sc_data_direction = DMA_NONE;
+	}
+
+	switch (SCp->cmnd[0]) {
+	case REQUEST_SENSE:
+		/* clear the internal sense magic */
+		SCp->cmnd[6] = 0;
+		/* fall through */
+	default:
+		/* OK, get it from the command */
+		switch(SCp->sc_data_direction) {
+		case DMA_BIDIRECTIONAL:
+		default:
+			printk(KERN_ERR "53c700: Unknown command for data direction ");
+			scsi_print_command(SCp);
+			
+			move_ins = 0;
+			break;
+		case DMA_NONE:
+			move_ins = 0;
+			break;
+		case DMA_FROM_DEVICE:
+			move_ins = SCRIPT_MOVE_DATA_IN;
+			break;
+		case DMA_TO_DEVICE:
+			move_ins = SCRIPT_MOVE_DATA_OUT;
+			break;
+		}
+	}
+
+	/* now build the scatter gather list */
+	direction = SCp->sc_data_direction;
+	if(move_ins != 0) {
+		int i;
+		int sg_count;
+		dma_addr_t vPtr = 0;
+		__u32 count = 0;
+
+		if(SCp->use_sg) {
+			sg_count = dma_map_sg(hostdata->dev, SCp->buffer,
+					      SCp->use_sg, direction);
+		} else {
+			vPtr = dma_map_single(hostdata->dev,
+					      SCp->request_buffer, 
+					      SCp->request_bufflen,
+					      direction);
+			count = SCp->request_bufflen;
+			slot->dma_handle = vPtr;
+			sg_count = 1;
+		}
+			
+
+		for(i = 0; i < sg_count; i++) {
+
+			if(SCp->use_sg) {
+				struct scatterlist *sg = SCp->buffer;
+
+				vPtr = sg_dma_address(&sg[i]);
+				count = sg_dma_len(&sg[i]);
+			}
+
+			slot->SG[i].ins = bS_to_host(move_ins | count);
+			DEBUG((" scatter block %d: move %d[%08x] from 0x%lx\n",
+			       i, count, slot->SG[i].ins, (unsigned long)vPtr));
+			slot->SG[i].pAddr = bS_to_host(vPtr);
+		}
+		slot->SG[i].ins = bS_to_host(SCRIPT_RETURN);
+		slot->SG[i].pAddr = 0;
+		dma_cache_sync(slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
+		DEBUG((" SETTING %08lx to %x\n",
+		       (&slot->pSG[i].ins), 
+		       slot->SG[i].ins));
+	}
+	slot->resume_offset = 0;
+	slot->pCmd = dma_map_single(hostdata->dev, SCp->cmnd,
+				    sizeof(SCp->cmnd), DMA_TO_DEVICE);
+	NCR_700_start_command(SCp);
+	return 0;
+}
+
+STATIC int
+NCR_700_abort(struct scsi_cmnd * SCp)
+{
+	struct NCR_700_command_slot *slot;
+
+	printk(KERN_INFO "scsi%d (%d:%d) New error handler wants to abort command\n\t",
+	       SCp->device->host->host_no, SCp->device->id, SCp->device->lun);
+	scsi_print_command(SCp);
+
+	slot = (struct NCR_700_command_slot *)SCp->host_scribble;
+
+	if(slot == NULL)
+		/* no outstanding command to abort */
+		return SUCCESS;
+	if(SCp->cmnd[0] == TEST_UNIT_READY) {
+		/* FIXME: This is because of a problem in the new
+		 * error handler.  When it is in error recovery, it
+		 * will send a TUR to a device it thinks may still be
+		 * showing a problem.  If the TUR isn't responded to,
+		 * it will abort it and mark the device off line.
+		 * Unfortunately, it does no other error recovery, so
+		 * this would leave us with an outstanding command
+		 * occupying a slot.  Rather than allow this to
+		 * happen, we issue a bus reset to force all
+		 * outstanding commands to terminate here. */
+		NCR_700_internal_bus_reset(SCp->device->host);
+		/* still drop through and return failed */
+	}
+	return FAILED;
+
+}
+
+STATIC int
+NCR_700_bus_reset(struct scsi_cmnd * SCp)
+{
+	DECLARE_COMPLETION(complete);
+	struct NCR_700_Host_Parameters *hostdata = 
+		(struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
+
+	printk(KERN_INFO "scsi%d (%d:%d) New error handler wants BUS reset, cmd %p\n\t",
+	       SCp->device->host->host_no, SCp->device->id, SCp->device->lun, SCp);
+	scsi_print_command(SCp);
+	/* In theory, eh_complete should always be null because the
+	 * eh is single threaded, but just in case we're handling a
+	 * reset via sg or something */
+	while(hostdata->eh_complete != NULL) {
+		spin_unlock_irq(SCp->device->host->host_lock);
+		msleep_interruptible(100);
+		spin_lock_irq(SCp->device->host->host_lock);
+	}
+	hostdata->eh_complete = &complete;
+	NCR_700_internal_bus_reset(SCp->device->host);
+	spin_unlock_irq(SCp->device->host->host_lock);
+	wait_for_completion(&complete);
+	spin_lock_irq(SCp->device->host->host_lock);
+	hostdata->eh_complete = NULL;
+	/* Revalidate the transport parameters of the failing device */
+	if(hostdata->fast)
+		spi_schedule_dv_device(SCp->device);
+	return SUCCESS;
+}
+
+STATIC int
+NCR_700_dev_reset(struct scsi_cmnd * SCp)
+{
+	printk(KERN_INFO "scsi%d (%d:%d) New error handler wants device reset\n\t",
+	       SCp->device->host->host_no, SCp->device->id, SCp->device->lun);
+	scsi_print_command(SCp);
+	
+	return FAILED;
+}
+
+STATIC int
+NCR_700_host_reset(struct scsi_cmnd * SCp)
+{
+	printk(KERN_INFO "scsi%d (%d:%d) New error handler wants HOST reset\n\t",
+	       SCp->device->host->host_no, SCp->device->id, SCp->device->lun);
+	scsi_print_command(SCp);
+
+	NCR_700_internal_bus_reset(SCp->device->host);
+	NCR_700_chip_reset(SCp->device->host);
+	return SUCCESS;
+}
+
+STATIC void
+NCR_700_set_period(struct scsi_target *STp, int period)
+{
+	struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
+	struct NCR_700_Host_Parameters *hostdata = 
+		(struct NCR_700_Host_Parameters *)SHp->hostdata[0];
+	
+	if(!hostdata->fast)
+		return;
+
+	if(period < hostdata->min_period)
+		period = hostdata->min_period;
+
+	spi_period(STp) = period;
+	spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
+			    NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
+	spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
+}
+
+STATIC void
+NCR_700_set_offset(struct scsi_target *STp, int offset)
+{
+	struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
+	struct NCR_700_Host_Parameters *hostdata = 
+		(struct NCR_700_Host_Parameters *)SHp->hostdata[0];
+	int max_offset = hostdata->chip710
+		? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET;
+	
+	if(!hostdata->fast)
+		return;
+
+	if(offset > max_offset)
+		offset = max_offset;
+
+	/* if we're currently async, make sure the period is reasonable */
+	if(spi_offset(STp) == 0 && (spi_period(STp) < hostdata->min_period ||
+				    spi_period(STp) > 0xff))
+		spi_period(STp) = hostdata->min_period;
+
+	spi_offset(STp) = offset;
+	spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
+			    NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
+	spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
+}
+
+
+
+STATIC int
+NCR_700_slave_configure(struct scsi_device *SDp)
+{
+	struct NCR_700_Host_Parameters *hostdata = 
+		(struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
+
+	/* to do here: allocate memory; build a queue_full list */
+	if(SDp->tagged_supported) {
+		scsi_set_tag_type(SDp, MSG_ORDERED_TAG);
+		scsi_activate_tcq(SDp, NCR_700_DEFAULT_TAGS);
+		NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
+	} else {
+		/* initialise to default depth */
+		scsi_adjust_queue_depth(SDp, 0, SDp->host->cmd_per_lun);
+	}
+	if(hostdata->fast) {
+		/* Find the correct offset and period via domain validation */
+		if (!spi_initial_dv(SDp->sdev_target))
+			spi_dv_device(SDp);
+	} else {
+		spi_offset(SDp->sdev_target) = 0;
+		spi_period(SDp->sdev_target) = 0;
+	}
+	return 0;
+}
+
+STATIC void
+NCR_700_slave_destroy(struct scsi_device *SDp)
+{
+	/* to do here: deallocate memory */
+}
+
+static int
+NCR_700_change_queue_depth(struct scsi_device *SDp, int depth)
+{
+	if (depth > NCR_700_MAX_TAGS)
+		depth = NCR_700_MAX_TAGS;
+
+	scsi_adjust_queue_depth(SDp, scsi_get_tag_type(SDp), depth);
+	return depth;
+}
+
+static int NCR_700_change_queue_type(struct scsi_device *SDp, int tag_type)
+{
+	int change_tag = ((tag_type ==0 &&  scsi_get_tag_type(SDp) != 0)
+			  || (tag_type != 0 && scsi_get_tag_type(SDp) == 0));
+	struct NCR_700_Host_Parameters *hostdata = 
+		(struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
+
+	scsi_set_tag_type(SDp, tag_type);
+
+	/* We have a global (per target) flag to track whether TCQ is
+	 * enabled, so we'll be turning it off for the entire target here.
+	 * our tag algorithm will fail if we mix tagged and untagged commands,
+	 * so quiesce the device before doing this */
+	if (change_tag)
+		scsi_target_quiesce(SDp->sdev_target);
+
+	if (!tag_type) {
+		/* shift back to the default unqueued number of commands
+		 * (the user can still raise this) */
+		scsi_deactivate_tcq(SDp, SDp->host->cmd_per_lun);
+		hostdata->tag_negotiated &= ~(1 << SDp->id);
+	} else {
+		/* Here, we cleared the negotiation flag above, so this
+		 * will force the driver to renegotiate */
+		scsi_activate_tcq(SDp, SDp->queue_depth);
+		if (change_tag)
+			NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
+	}
+	if (change_tag)
+		scsi_target_resume(SDp->sdev_target);
+
+	return tag_type;
+}
+
+static ssize_t
+NCR_700_show_active_tags(struct device *dev, char *buf)
+{
+	struct scsi_device *SDp = to_scsi_device(dev);
+
+	return snprintf(buf, 20, "%d\n", NCR_700_get_depth(SDp));
+}
+
+static struct device_attribute NCR_700_active_tags_attr = {
+	.attr = {
+		.name =		"active_tags",
+		.mode =		S_IRUGO,
+	},
+	.show = NCR_700_show_active_tags,
+};
+
+STATIC struct device_attribute *NCR_700_dev_attrs[] = {
+	&NCR_700_active_tags_attr,
+	NULL,
+};
+
+EXPORT_SYMBOL(NCR_700_detect);
+EXPORT_SYMBOL(NCR_700_release);
+EXPORT_SYMBOL(NCR_700_intr);
+
+static struct spi_function_template NCR_700_transport_functions =  {
+	.set_period	= NCR_700_set_period,
+	.show_period	= 1,
+	.set_offset	= NCR_700_set_offset,
+	.show_offset	= 1,
+};
+
+static int __init NCR_700_init(void)
+{
+	NCR_700_transport_template = spi_attach_transport(&NCR_700_transport_functions);
+	if(!NCR_700_transport_template)
+		return -ENODEV;
+	return 0;
+}
+
+static void __exit NCR_700_exit(void)
+{
+	spi_release_transport(NCR_700_transport_template);
+}
+
+module_init(NCR_700_init);
+module_exit(NCR_700_exit);
+