Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2851 insertions, 0 deletions

diff --git a/drivers/scsi/aic7xxx/aic79xx_osm.c b/drivers/scsi/aic7xxx/aic79xx_osm.c
new file mode 100644
index 000000000..f2f3405cd
--- /dev/null
+++ b/drivers/scsi/aic7xxx/aic79xx_osm.c
@@ -0,0 +1,2851 @@
+/*
+ * Adaptec AIC79xx device driver for Linux.
+ *
+ * $Id: //depot/aic7xxx/linux/drivers/scsi/aic7xxx/aic79xx_osm.c#171 $
+ *
+ * --------------------------------------------------------------------------
+ * Copyright (c) 1994-2000 Justin T. Gibbs.
+ * Copyright (c) 1997-1999 Doug Ledford
+ * Copyright (c) 2000-2003 Adaptec Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce at minimum a disclaimer
+ *    substantially similar to the "NO WARRANTY" disclaimer below
+ *    ("Disclaimer") and any redistribution must be conditioned upon
+ *    including a substantially similar Disclaimer requirement for further
+ *    binary redistribution.
+ * 3. Neither the names of the above-listed copyright holders nor the names
+ *    of any contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ *
+ * NO WARRANTY
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGES.
+ */
+
+#include "aic79xx_osm.h"
+#include "aic79xx_inline.h"
+#include <scsi/scsicam.h>
+
+static struct scsi_transport_template *ahd_linux_transport_template = NULL;
+
+#include <linux/init.h>		/* __setup */
+#include <linux/mm.h>		/* For fetching system memory size */
+#include <linux/blkdev.h>		/* For block_size() */
+#include <linux/delay.h>	/* For ssleep/msleep */
+#include <linux/device.h>
+#include <linux/slab.h>
+
+/*
+ * Bucket size for counting good commands in between bad ones.
+ */
+#define AHD_LINUX_ERR_THRESH	1000
+
+/*
+ * Set this to the delay in seconds after SCSI bus reset.
+ * Note, we honor this only for the initial bus reset.
+ * The scsi error recovery code performs its own bus settle
+ * delay handling for error recovery actions.
+ */
+#ifdef CONFIG_AIC79XX_RESET_DELAY_MS
+#define AIC79XX_RESET_DELAY CONFIG_AIC79XX_RESET_DELAY_MS
+#else
+#define AIC79XX_RESET_DELAY 5000
+#endif
+
+/*
+ * To change the default number of tagged transactions allowed per-device,
+ * add a line to the lilo.conf file like:
+ * append="aic79xx=verbose,tag_info:{{32,32,32,32},{32,32,32,32}}"
+ * which will result in the first four devices on the first two
+ * controllers being set to a tagged queue depth of 32.
+ *
+ * The tag_commands is an array of 16 to allow for wide and twin adapters.
+ * Twin adapters will use indexes 0-7 for channel 0, and indexes 8-15
+ * for channel 1.
+ */
+typedef struct {
+	uint16_t tag_commands[16];	/* Allow for wide/twin adapters. */
+} adapter_tag_info_t;
+
+/*
+ * Modify this as you see fit for your system.
+ *
+ * 0			tagged queuing disabled
+ * 1 <= n <= 253	n == max tags ever dispatched.
+ *
+ * The driver will throttle the number of commands dispatched to a
+ * device if it returns queue full.  For devices with a fixed maximum
+ * queue depth, the driver will eventually determine this depth and
+ * lock it in (a console message is printed to indicate that a lock
+ * has occurred).  On some devices, queue full is returned for a temporary
+ * resource shortage.  These devices will return queue full at varying
+ * depths.  The driver will throttle back when the queue fulls occur and
+ * attempt to slowly increase the depth over time as the device recovers
+ * from the resource shortage.
+ *
+ * In this example, the first line will disable tagged queueing for all
+ * the devices on the first probed aic79xx adapter.
+ *
+ * The second line enables tagged queueing with 4 commands/LUN for IDs
+ * (0, 2-11, 13-15), disables tagged queueing for ID 12, and tells the
+ * driver to attempt to use up to 64 tags for ID 1.
+ *
+ * The third line is the same as the first line.
+ *
+ * The fourth line disables tagged queueing for devices 0 and 3.  It
+ * enables tagged queueing for the other IDs, with 16 commands/LUN
+ * for IDs 1 and 4, 127 commands/LUN for ID 8, and 4 commands/LUN for
+ * IDs 2, 5-7, and 9-15.
+ */
+
+/*
+ * NOTE: The below structure is for reference only, the actual structure
+ *       to modify in order to change things is just below this comment block.
+adapter_tag_info_t aic79xx_tag_info[] =
+{
+	{{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
+	{{4, 64, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 0, 4, 4, 4}},
+	{{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
+	{{0, 16, 4, 0, 16, 4, 4, 4, 127, 4, 4, 4, 4, 4, 4, 4}}
+};
+*/
+
+#ifdef CONFIG_AIC79XX_CMDS_PER_DEVICE
+#define AIC79XX_CMDS_PER_DEVICE CONFIG_AIC79XX_CMDS_PER_DEVICE
+#else
+#define AIC79XX_CMDS_PER_DEVICE AHD_MAX_QUEUE
+#endif
+
+#define AIC79XX_CONFIGED_TAG_COMMANDS {					\
+	AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,		\
+	AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,		\
+	AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,		\
+	AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,		\
+	AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,		\
+	AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,		\
+	AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,		\
+	AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE		\
+}
+
+/*
+ * By default, use the number of commands specified by
+ * the users kernel configuration.
+ */
+static adapter_tag_info_t aic79xx_tag_info[] =
+{
+	{AIC79XX_CONFIGED_TAG_COMMANDS},
+	{AIC79XX_CONFIGED_TAG_COMMANDS},
+	{AIC79XX_CONFIGED_TAG_COMMANDS},
+	{AIC79XX_CONFIGED_TAG_COMMANDS},
+	{AIC79XX_CONFIGED_TAG_COMMANDS},
+	{AIC79XX_CONFIGED_TAG_COMMANDS},
+	{AIC79XX_CONFIGED_TAG_COMMANDS},
+	{AIC79XX_CONFIGED_TAG_COMMANDS},
+	{AIC79XX_CONFIGED_TAG_COMMANDS},
+	{AIC79XX_CONFIGED_TAG_COMMANDS},
+	{AIC79XX_CONFIGED_TAG_COMMANDS},
+	{AIC79XX_CONFIGED_TAG_COMMANDS},
+	{AIC79XX_CONFIGED_TAG_COMMANDS},
+	{AIC79XX_CONFIGED_TAG_COMMANDS},
+	{AIC79XX_CONFIGED_TAG_COMMANDS},
+	{AIC79XX_CONFIGED_TAG_COMMANDS}
+};
+
+/*
+ * The I/O cell on the chip is very configurable in respect to its analog
+ * characteristics.  Set the defaults here; they can be overriden with
+ * the proper insmod parameters.
+ */
+struct ahd_linux_iocell_opts
+{
+	uint8_t	precomp;
+	uint8_t	slewrate;
+	uint8_t amplitude;
+};
+#define AIC79XX_DEFAULT_PRECOMP		0xFF
+#define AIC79XX_DEFAULT_SLEWRATE	0xFF
+#define AIC79XX_DEFAULT_AMPLITUDE	0xFF
+#define AIC79XX_DEFAULT_IOOPTS			\
+{						\
+	AIC79XX_DEFAULT_PRECOMP,		\
+	AIC79XX_DEFAULT_SLEWRATE,		\
+	AIC79XX_DEFAULT_AMPLITUDE		\
+}
+#define AIC79XX_PRECOMP_INDEX	0
+#define AIC79XX_SLEWRATE_INDEX	1
+#define AIC79XX_AMPLITUDE_INDEX	2
+static struct ahd_linux_iocell_opts aic79xx_iocell_info[] __ro_after_init =
+{
+	AIC79XX_DEFAULT_IOOPTS,
+	AIC79XX_DEFAULT_IOOPTS,
+	AIC79XX_DEFAULT_IOOPTS,
+	AIC79XX_DEFAULT_IOOPTS,
+	AIC79XX_DEFAULT_IOOPTS,
+	AIC79XX_DEFAULT_IOOPTS,
+	AIC79XX_DEFAULT_IOOPTS,
+	AIC79XX_DEFAULT_IOOPTS,
+	AIC79XX_DEFAULT_IOOPTS,
+	AIC79XX_DEFAULT_IOOPTS,
+	AIC79XX_DEFAULT_IOOPTS,
+	AIC79XX_DEFAULT_IOOPTS,
+	AIC79XX_DEFAULT_IOOPTS,
+	AIC79XX_DEFAULT_IOOPTS,
+	AIC79XX_DEFAULT_IOOPTS,
+	AIC79XX_DEFAULT_IOOPTS
+};
+
+/*
+ * There should be a specific return value for this in scsi.h, but
+ * it seems that most drivers ignore it.
+ */
+#define DID_UNDERFLOW   DID_ERROR
+
+void
+ahd_print_path(struct ahd_softc *ahd, struct scb *scb)
+{
+	printk("(scsi%d:%c:%d:%d): ",
+	       ahd->platform_data->host->host_no,
+	       scb != NULL ? SCB_GET_CHANNEL(ahd, scb) : 'X',
+	       scb != NULL ? SCB_GET_TARGET(ahd, scb) : -1,
+	       scb != NULL ? SCB_GET_LUN(scb) : -1);
+}
+
+/*
+ * XXX - these options apply unilaterally to _all_ adapters
+ *       cards in the system.  This should be fixed.  Exceptions to this
+ *       rule are noted in the comments.
+ */
+
+/*
+ * Skip the scsi bus reset.  Non 0 make us skip the reset at startup.  This
+ * has no effect on any later resets that might occur due to things like
+ * SCSI bus timeouts.
+ */
+static uint32_t aic79xx_no_reset;
+
+/*
+ * Should we force EXTENDED translation on a controller.
+ *     0 == Use whatever is in the SEEPROM or default to off
+ *     1 == Use whatever is in the SEEPROM or default to on
+ */
+static uint32_t aic79xx_extended;
+
+/*
+ * PCI bus parity checking of the Adaptec controllers.  This is somewhat
+ * dubious at best.  To my knowledge, this option has never actually
+ * solved a PCI parity problem, but on certain machines with broken PCI
+ * chipset configurations, it can generate tons of false error messages.
+ * It's included in the driver for completeness.
+ *   0	   = Shut off PCI parity check
+ *   non-0 = Enable PCI parity check
+ *
+ * NOTE: you can't actually pass -1 on the lilo prompt.  So, to set this
+ * variable to -1 you would actually want to simply pass the variable
+ * name without a number.  That will invert the 0 which will result in
+ * -1.
+ */
+static uint32_t aic79xx_pci_parity = ~0;
+
+/*
+ * There are lots of broken chipsets in the world.  Some of them will
+ * violate the PCI spec when we issue byte sized memory writes to our
+ * controller.  I/O mapped register access, if allowed by the given
+ * platform, will work in almost all cases.
+ */
+uint32_t aic79xx_allow_memio = ~0;
+
+/*
+ * So that we can set how long each device is given as a selection timeout.
+ * The table of values goes like this:
+ *   0 - 256ms
+ *   1 - 128ms
+ *   2 - 64ms
+ *   3 - 32ms
+ * We default to 256ms because some older devices need a longer time
+ * to respond to initial selection.
+ */
+static uint32_t aic79xx_seltime;
+
+/*
+ * Certain devices do not perform any aging on commands.  Should the
+ * device be saturated by commands in one portion of the disk, it is
+ * possible for transactions on far away sectors to never be serviced.
+ * To handle these devices, we can periodically send an ordered tag to
+ * force all outstanding transactions to be serviced prior to a new
+ * transaction.
+ */
+static uint32_t aic79xx_periodic_otag;
+
+/* Some storage boxes are using an LSI chip which has a bug making it
+ * impossible to use aic79xx Rev B chip in 320 speeds.  The following
+ * storage boxes have been reported to be buggy:
+ * EonStor 3U 16-Bay: U16U-G3A3
+ * EonStor 2U 12-Bay: U12U-G3A3
+ * SentinelRAID: 2500F R5 / R6
+ * SentinelRAID: 2500F R1
+ * SentinelRAID: 2500F/1500F
+ * SentinelRAID: 150F
+ * 
+ * To get around this LSI bug, you can set your board to 160 mode
+ * or you can enable the SLOWCRC bit.
+ */
+uint32_t aic79xx_slowcrc;
+
+/*
+ * Module information and settable options.
+ */
+static char *aic79xx = NULL;
+
+MODULE_AUTHOR("Maintainer: Hannes Reinecke <hare@suse.de>");
+MODULE_DESCRIPTION("Adaptec AIC790X U320 SCSI Host Bus Adapter driver");
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_VERSION(AIC79XX_DRIVER_VERSION);
+module_param(aic79xx, charp, 0444);
+MODULE_PARM_DESC(aic79xx,
+"period-delimited options string:\n"
+"	verbose			Enable verbose/diagnostic logging\n"
+"	allow_memio		Allow device registers to be memory mapped\n"
+"	debug			Bitmask of debug values to enable\n"
+"	no_reset		Suppress initial bus resets\n"
+"	extended		Enable extended geometry on all controllers\n"
+"	periodic_otag		Send an ordered tagged transaction\n"
+"				periodically to prevent tag starvation.\n"
+"				This may be required by some older disk\n"
+"				or drives/RAID arrays.\n"
+"	tag_info:<tag_str>	Set per-target tag depth\n"
+"	global_tag_depth:<int>	Global tag depth for all targets on all buses\n"
+"	slewrate:<slewrate_list>Set the signal slew rate (0-15).\n"
+"	precomp:<pcomp_list>	Set the signal precompensation (0-7).\n"
+"	amplitude:<int>		Set the signal amplitude (0-7).\n"
+"	seltime:<int>		Selection Timeout:\n"
+"				(0/256ms,1/128ms,2/64ms,3/32ms)\n"
+"	slowcrc			Turn on the SLOWCRC bit (Rev B only)\n"		 
+"\n"
+"	Sample modprobe configuration file:\n"
+"	#	Enable verbose logging\n"
+"	#	Set tag depth on Controller 2/Target 2 to 10 tags\n"
+"	#	Shorten the selection timeout to 128ms\n"
+"\n"
+"	options aic79xx 'aic79xx=verbose.tag_info:{{}.{}.{..10}}.seltime:1'\n"
+);
+
+static void ahd_linux_handle_scsi_status(struct ahd_softc *,
+					 struct scsi_device *,
+					 struct scb *);
+static void ahd_linux_queue_cmd_complete(struct ahd_softc *ahd,
+					 struct scsi_cmnd *cmd);
+static int ahd_linux_queue_abort_cmd(struct scsi_cmnd *cmd);
+static void ahd_linux_initialize_scsi_bus(struct ahd_softc *ahd);
+static u_int ahd_linux_user_tagdepth(struct ahd_softc *ahd,
+				     struct ahd_devinfo *devinfo);
+static void ahd_linux_device_queue_depth(struct scsi_device *);
+static int ahd_linux_run_command(struct ahd_softc*,
+				 struct ahd_linux_device *,
+				 struct scsi_cmnd *);
+static void ahd_linux_setup_tag_info_global(char *p);
+static int  aic79xx_setup(char *c);
+static void ahd_freeze_simq(struct ahd_softc *ahd);
+static void ahd_release_simq(struct ahd_softc *ahd);
+
+static int ahd_linux_unit;
+
+
+/************************** OS Utility Wrappers *******************************/
+void ahd_delay(long);
+void
+ahd_delay(long usec)
+{
+	/*
+	 * udelay on Linux can have problems for
+	 * multi-millisecond waits.  Wait at most
+	 * 1024us per call.
+	 */
+	while (usec > 0) {
+		udelay(usec % 1024);
+		usec -= 1024;
+	}
+}
+
+
+/***************************** Low Level I/O **********************************/
+uint8_t ahd_inb(struct ahd_softc * ahd, long port);
+void ahd_outb(struct ahd_softc * ahd, long port, uint8_t val);
+void ahd_outw_atomic(struct ahd_softc * ahd,
+				     long port, uint16_t val);
+void ahd_outsb(struct ahd_softc * ahd, long port,
+			       uint8_t *, int count);
+void ahd_insb(struct ahd_softc * ahd, long port,
+			       uint8_t *, int count);
+
+uint8_t
+ahd_inb(struct ahd_softc * ahd, long port)
+{
+	uint8_t x;
+
+	if (ahd->tags[0] == BUS_SPACE_MEMIO) {
+		x = readb(ahd->bshs[0].maddr + port);
+	} else {
+		x = inb(ahd->bshs[(port) >> 8].ioport + ((port) & 0xFF));
+	}
+	mb();
+	return (x);
+}
+
+#if 0 /* unused */
+static uint16_t
+ahd_inw_atomic(struct ahd_softc * ahd, long port)
+{
+	uint8_t x;
+
+	if (ahd->tags[0] == BUS_SPACE_MEMIO) {
+		x = readw(ahd->bshs[0].maddr + port);
+	} else {
+		x = inw(ahd->bshs[(port) >> 8].ioport + ((port) & 0xFF));
+	}
+	mb();
+	return (x);
+}
+#endif
+
+void
+ahd_outb(struct ahd_softc * ahd, long port, uint8_t val)
+{
+	if (ahd->tags[0] == BUS_SPACE_MEMIO) {
+		writeb(val, ahd->bshs[0].maddr + port);
+	} else {
+		outb(val, ahd->bshs[(port) >> 8].ioport + (port & 0xFF));
+	}
+	mb();
+}
+
+void
+ahd_outw_atomic(struct ahd_softc * ahd, long port, uint16_t val)
+{
+	if (ahd->tags[0] == BUS_SPACE_MEMIO) {
+		writew(val, ahd->bshs[0].maddr + port);
+	} else {
+		outw(val, ahd->bshs[(port) >> 8].ioport + (port & 0xFF));
+	}
+	mb();
+}
+
+void
+ahd_outsb(struct ahd_softc * ahd, long port, uint8_t *array, int count)
+{
+	int i;
+
+	/*
+	 * There is probably a more efficient way to do this on Linux
+	 * but we don't use this for anything speed critical and this
+	 * should work.
+	 */
+	for (i = 0; i < count; i++)
+		ahd_outb(ahd, port, *array++);
+}
+
+void
+ahd_insb(struct ahd_softc * ahd, long port, uint8_t *array, int count)
+{
+	int i;
+
+	/*
+	 * There is probably a more efficient way to do this on Linux
+	 * but we don't use this for anything speed critical and this
+	 * should work.
+	 */
+	for (i = 0; i < count; i++)
+		*array++ = ahd_inb(ahd, port);
+}
+
+/******************************* PCI Routines *********************************/
+uint32_t
+ahd_pci_read_config(ahd_dev_softc_t pci, int reg, int width)
+{
+	switch (width) {
+	case 1:
+	{
+		uint8_t retval;
+
+		pci_read_config_byte(pci, reg, &retval);
+		return (retval);
+	}
+	case 2:
+	{
+		uint16_t retval;
+		pci_read_config_word(pci, reg, &retval);
+		return (retval);
+	}
+	case 4:
+	{
+		uint32_t retval;
+		pci_read_config_dword(pci, reg, &retval);
+		return (retval);
+	}
+	default:
+		panic("ahd_pci_read_config: Read size too big");
+		/* NOTREACHED */
+		return (0);
+	}
+}
+
+void
+ahd_pci_write_config(ahd_dev_softc_t pci, int reg, uint32_t value, int width)
+{
+	switch (width) {
+	case 1:
+		pci_write_config_byte(pci, reg, value);
+		break;
+	case 2:
+		pci_write_config_word(pci, reg, value);
+		break;
+	case 4:
+		pci_write_config_dword(pci, reg, value);
+		break;
+	default:
+		panic("ahd_pci_write_config: Write size too big");
+		/* NOTREACHED */
+	}
+}
+
+/****************************** Inlines ***************************************/
+static void ahd_linux_unmap_scb(struct ahd_softc*, struct scb*);
+
+static void
+ahd_linux_unmap_scb(struct ahd_softc *ahd, struct scb *scb)
+{
+	struct scsi_cmnd *cmd;
+
+	cmd = scb->io_ctx;
+	ahd_sync_sglist(ahd, scb, BUS_DMASYNC_POSTWRITE);
+	scsi_dma_unmap(cmd);
+}
+
+/******************************** Macros **************************************/
+#define BUILD_SCSIID(ahd, cmd)						\
+	(((scmd_id(cmd) << TID_SHIFT) & TID) | (ahd)->our_id)
+
+/*
+ * Return a string describing the driver.
+ */
+static const char *
+ahd_linux_info(struct Scsi_Host *host)
+{
+	static char buffer[512];
+	char	ahd_info[256];
+	char   *bp;
+	struct ahd_softc *ahd;
+
+	bp = &buffer[0];
+	ahd = *(struct ahd_softc **)host->hostdata;
+	memset(bp, 0, sizeof(buffer));
+	strcpy(bp, "Adaptec AIC79XX PCI-X SCSI HBA DRIVER, Rev " AIC79XX_DRIVER_VERSION "\n"
+			"        <");
+	strcat(bp, ahd->description);
+	strcat(bp, ">\n"
+			"        ");
+	ahd_controller_info(ahd, ahd_info);
+	strcat(bp, ahd_info);
+
+	return (bp);
+}
+
+/*
+ * Queue an SCB to the controller.
+ */
+static int ahd_linux_queue_lck(struct scsi_cmnd *cmd)
+{
+	struct	 ahd_softc *ahd;
+	struct	 ahd_linux_device *dev = scsi_transport_device_data(cmd->device);
+	int rtn = SCSI_MLQUEUE_HOST_BUSY;
+
+	ahd = *(struct ahd_softc **)cmd->device->host->hostdata;
+
+	cmd->result = CAM_REQ_INPROG << 16;
+	rtn = ahd_linux_run_command(ahd, dev, cmd);
+
+	return rtn;
+}
+
+static DEF_SCSI_QCMD(ahd_linux_queue)
+
+static struct scsi_target **
+ahd_linux_target_in_softc(struct scsi_target *starget)
+{
+	struct	ahd_softc *ahd =
+		*((struct ahd_softc **)dev_to_shost(&starget->dev)->hostdata);
+	unsigned int target_offset;
+
+	target_offset = starget->id;
+	if (starget->channel != 0)
+		target_offset += 8;
+
+	return &ahd->platform_data->starget[target_offset];
+}
+
+static int
+ahd_linux_target_alloc(struct scsi_target *starget)
+{
+	struct	ahd_softc *ahd =
+		*((struct ahd_softc **)dev_to_shost(&starget->dev)->hostdata);
+	struct seeprom_config *sc = ahd->seep_config;
+	unsigned long flags;
+	struct scsi_target **ahd_targp = ahd_linux_target_in_softc(starget);
+	struct ahd_devinfo devinfo;
+	struct ahd_initiator_tinfo *tinfo;
+	struct ahd_tmode_tstate *tstate;
+	char channel = starget->channel + 'A';
+
+	ahd_lock(ahd, &flags);
+
+	BUG_ON(*ahd_targp != NULL);
+
+	*ahd_targp = starget;
+
+	if (sc) {
+		int flags = sc->device_flags[starget->id];
+
+		tinfo = ahd_fetch_transinfo(ahd, 'A', ahd->our_id,
+					    starget->id, &tstate);
+
+		if ((flags  & CFPACKETIZED) == 0) {
+			/* don't negotiate packetized (IU) transfers */
+			spi_max_iu(starget) = 0;
+		} else {
+			if ((ahd->features & AHD_RTI) == 0)
+				spi_rti(starget) = 0;
+		}
+
+		if ((flags & CFQAS) == 0)
+			spi_max_qas(starget) = 0;
+
+		/* Transinfo values have been set to BIOS settings */
+		spi_max_width(starget) = (flags & CFWIDEB) ? 1 : 0;
+		spi_min_period(starget) = tinfo->user.period;
+		spi_max_offset(starget) = tinfo->user.offset;
+	}
+
+	tinfo = ahd_fetch_transinfo(ahd, channel, ahd->our_id,
+				    starget->id, &tstate);
+	ahd_compile_devinfo(&devinfo, ahd->our_id, starget->id,
+			    CAM_LUN_WILDCARD, channel,
+			    ROLE_INITIATOR);
+	ahd_set_syncrate(ahd, &devinfo, 0, 0, 0,
+			 AHD_TRANS_GOAL, /*paused*/FALSE);
+	ahd_set_width(ahd, &devinfo, MSG_EXT_WDTR_BUS_8_BIT,
+		      AHD_TRANS_GOAL, /*paused*/FALSE);
+	ahd_unlock(ahd, &flags);
+
+	return 0;
+}
+
+static void
+ahd_linux_target_destroy(struct scsi_target *starget)
+{
+	struct scsi_target **ahd_targp = ahd_linux_target_in_softc(starget);
+
+	*ahd_targp = NULL;
+}
+
+static int
+ahd_linux_slave_alloc(struct scsi_device *sdev)
+{
+	struct	ahd_softc *ahd =
+		*((struct ahd_softc **)sdev->host->hostdata);
+	struct ahd_linux_device *dev;
+
+	if (bootverbose)
+		printk("%s: Slave Alloc %d\n", ahd_name(ahd), sdev->id);
+
+	dev = scsi_transport_device_data(sdev);
+	memset(dev, 0, sizeof(*dev));
+
+	/*
+	 * We start out life using untagged
+	 * transactions of which we allow one.
+	 */
+	dev->openings = 1;
+
+	/*
+	 * Set maxtags to 0.  This will be changed if we
+	 * later determine that we are dealing with
+	 * a tagged queuing capable device.
+	 */
+	dev->maxtags = 0;
+	
+	return (0);
+}
+
+static int
+ahd_linux_slave_configure(struct scsi_device *sdev)
+{
+	if (bootverbose)
+		sdev_printk(KERN_INFO, sdev, "Slave Configure\n");
+
+	ahd_linux_device_queue_depth(sdev);
+
+	/* Initial Domain Validation */
+	if (!spi_initial_dv(sdev->sdev_target))
+		spi_dv_device(sdev);
+
+	return 0;
+}
+
+#if defined(__i386__)
+/*
+ * Return the disk geometry for the given SCSI device.
+ */
+static int
+ahd_linux_biosparam(struct scsi_device *sdev, struct block_device *bdev,
+		    sector_t capacity, int geom[])
+{
+	int	 heads;
+	int	 sectors;
+	int	 cylinders;
+	int	 extended;
+	struct	 ahd_softc *ahd;
+
+	ahd = *((struct ahd_softc **)sdev->host->hostdata);
+
+	if (scsi_partsize(bdev, capacity, geom))
+		return 0;
+
+	heads = 64;
+	sectors = 32;
+	cylinders = aic_sector_div(capacity, heads, sectors);
+
+	if (aic79xx_extended != 0)
+		extended = 1;
+	else
+		extended = (ahd->flags & AHD_EXTENDED_TRANS_A) != 0;
+	if (extended && cylinders >= 1024) {
+		heads = 255;
+		sectors = 63;
+		cylinders = aic_sector_div(capacity, heads, sectors);
+	}
+	geom[0] = heads;
+	geom[1] = sectors;
+	geom[2] = cylinders;
+	return (0);
+}
+#endif
+
+/*
+ * Abort the current SCSI command(s).
+ */
+static int
+ahd_linux_abort(struct scsi_cmnd *cmd)
+{
+	return ahd_linux_queue_abort_cmd(cmd);
+}
+
+/*
+ * Attempt to send a target reset message to the device that timed out.
+ */
+static int
+ahd_linux_dev_reset(struct scsi_cmnd *cmd)
+{
+	struct ahd_softc *ahd;
+	struct ahd_linux_device *dev;
+	struct scb *reset_scb;
+	u_int  cdb_byte;
+	int    retval = SUCCESS;
+	struct	ahd_initiator_tinfo *tinfo;
+	struct	ahd_tmode_tstate *tstate;
+	unsigned long flags;
+	DECLARE_COMPLETION_ONSTACK(done);
+
+	reset_scb = NULL;
+
+	ahd = *(struct ahd_softc **)cmd->device->host->hostdata;
+
+	scmd_printk(KERN_INFO, cmd,
+		    "Attempting to queue a TARGET RESET message:");
+
+	printk("CDB:");
+	for (cdb_byte = 0; cdb_byte < cmd->cmd_len; cdb_byte++)
+		printk(" 0x%x", cmd->cmnd[cdb_byte]);
+	printk("\n");
+
+	/*
+	 * Determine if we currently own this command.
+	 */
+	dev = scsi_transport_device_data(cmd->device);
+
+	if (dev == NULL) {
+		/*
+		 * No target device for this command exists,
+		 * so we must not still own the command.
+		 */
+		scmd_printk(KERN_INFO, cmd, "Is not an active device\n");
+		return SUCCESS;
+	}
+
+	/*
+	 * Generate us a new SCB
+	 */
+	reset_scb = ahd_get_scb(ahd, AHD_NEVER_COL_IDX);
+	if (!reset_scb) {
+		scmd_printk(KERN_INFO, cmd, "No SCB available\n");
+		return FAILED;
+	}
+
+	tinfo = ahd_fetch_transinfo(ahd, 'A', ahd->our_id,
+				    cmd->device->id, &tstate);
+	reset_scb->io_ctx = cmd;
+	reset_scb->platform_data->dev = dev;
+	reset_scb->sg_count = 0;
+	ahd_set_residual(reset_scb, 0);
+	ahd_set_sense_residual(reset_scb, 0);
+	reset_scb->platform_data->xfer_len = 0;
+	reset_scb->hscb->control = 0;
+	reset_scb->hscb->scsiid = BUILD_SCSIID(ahd,cmd);
+	reset_scb->hscb->lun = cmd->device->lun;
+	reset_scb->hscb->cdb_len = 0;
+	reset_scb->hscb->task_management = SIU_TASKMGMT_LUN_RESET;
+	reset_scb->flags |= SCB_DEVICE_RESET|SCB_RECOVERY_SCB|SCB_ACTIVE;
+	if ((tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ) != 0) {
+		reset_scb->flags |= SCB_PACKETIZED;
+	} else {
+		reset_scb->hscb->control |= MK_MESSAGE;
+	}
+	dev->openings--;
+	dev->active++;
+	dev->commands_issued++;
+
+	ahd_lock(ahd, &flags);
+
+	LIST_INSERT_HEAD(&ahd->pending_scbs, reset_scb, pending_links);
+	ahd_queue_scb(ahd, reset_scb);
+
+	ahd->platform_data->eh_done = &done;
+	ahd_unlock(ahd, &flags);
+
+	printk("%s: Device reset code sleeping\n", ahd_name(ahd));
+	if (!wait_for_completion_timeout(&done, 5 * HZ)) {
+		ahd_lock(ahd, &flags);
+		ahd->platform_data->eh_done = NULL;
+		ahd_unlock(ahd, &flags);
+		printk("%s: Device reset timer expired (active %d)\n",
+		       ahd_name(ahd), dev->active);
+		retval = FAILED;
+	}
+	printk("%s: Device reset returning 0x%x\n", ahd_name(ahd), retval);
+
+	return (retval);
+}
+
+/*
+ * Reset the SCSI bus.
+ */
+static int
+ahd_linux_bus_reset(struct scsi_cmnd *cmd)
+{
+	struct ahd_softc *ahd;
+	int    found;
+	unsigned long flags;
+
+	ahd = *(struct ahd_softc **)cmd->device->host->hostdata;
+#ifdef AHD_DEBUG
+	if ((ahd_debug & AHD_SHOW_RECOVERY) != 0)
+		printk("%s: Bus reset called for cmd %p\n",
+		       ahd_name(ahd), cmd);
+#endif
+	ahd_lock(ahd, &flags);
+
+	found = ahd_reset_channel(ahd, scmd_channel(cmd) + 'A',
+				  /*initiate reset*/TRUE);
+	ahd_unlock(ahd, &flags);
+
+	if (bootverbose)
+		printk("%s: SCSI bus reset delivered. "
+		       "%d SCBs aborted.\n", ahd_name(ahd), found);
+
+	return (SUCCESS);
+}
+
+struct scsi_host_template aic79xx_driver_template = {
+	.module			= THIS_MODULE,
+	.name			= "aic79xx",
+	.proc_name		= "aic79xx",
+	.show_info		= ahd_linux_show_info,
+	.write_info	 	= ahd_proc_write_seeprom,
+	.info			= ahd_linux_info,
+	.queuecommand		= ahd_linux_queue,
+	.eh_abort_handler	= ahd_linux_abort,
+	.eh_device_reset_handler = ahd_linux_dev_reset,
+	.eh_bus_reset_handler	= ahd_linux_bus_reset,
+#if defined(__i386__)
+	.bios_param		= ahd_linux_biosparam,
+#endif
+	.can_queue		= AHD_MAX_QUEUE,
+	.this_id		= -1,
+	.max_sectors		= 8192,
+	.cmd_per_lun		= 2,
+	.slave_alloc		= ahd_linux_slave_alloc,
+	.slave_configure	= ahd_linux_slave_configure,
+	.target_alloc		= ahd_linux_target_alloc,
+	.target_destroy		= ahd_linux_target_destroy,
+};
+
+/******************************** Bus DMA *************************************/
+int
+ahd_dma_tag_create(struct ahd_softc *ahd, bus_dma_tag_t parent,
+		   bus_size_t alignment, bus_size_t boundary,
+		   dma_addr_t lowaddr, dma_addr_t highaddr,
+		   bus_dma_filter_t *filter, void *filterarg,
+		   bus_size_t maxsize, int nsegments,
+		   bus_size_t maxsegsz, int flags, bus_dma_tag_t *ret_tag)
+{
+	bus_dma_tag_t dmat;
+
+	dmat = kmalloc(sizeof(*dmat), GFP_ATOMIC);
+	if (dmat == NULL)
+		return (ENOMEM);
+
+	/*
+	 * Linux is very simplistic about DMA memory.  For now don't
+	 * maintain all specification information.  Once Linux supplies
+	 * better facilities for doing these operations, or the
+	 * needs of this particular driver change, we might need to do
+	 * more here.
+	 */
+	dmat->alignment = alignment;
+	dmat->boundary = boundary;
+	dmat->maxsize = maxsize;
+	*ret_tag = dmat;
+	return (0);
+}
+
+void
+ahd_dma_tag_destroy(struct ahd_softc *ahd, bus_dma_tag_t dmat)
+{
+	kfree(dmat);
+}
+
+int
+ahd_dmamem_alloc(struct ahd_softc *ahd, bus_dma_tag_t dmat, void** vaddr,
+		 int flags, bus_dmamap_t *mapp)
+{
+	*vaddr = dma_alloc_coherent(&ahd->dev_softc->dev, dmat->maxsize, mapp,
+				    GFP_ATOMIC);
+	if (*vaddr == NULL)
+		return (ENOMEM);
+	return(0);
+}
+
+void
+ahd_dmamem_free(struct ahd_softc *ahd, bus_dma_tag_t dmat,
+		void* vaddr, bus_dmamap_t map)
+{
+	dma_free_coherent(&ahd->dev_softc->dev, dmat->maxsize, vaddr, map);
+}
+
+int
+ahd_dmamap_load(struct ahd_softc *ahd, bus_dma_tag_t dmat, bus_dmamap_t map,
+		void *buf, bus_size_t buflen, bus_dmamap_callback_t *cb,
+		void *cb_arg, int flags)
+{
+	/*
+	 * Assume for now that this will only be used during
+	 * initialization and not for per-transaction buffer mapping.
+	 */
+	bus_dma_segment_t stack_sg;
+
+	stack_sg.ds_addr = map;
+	stack_sg.ds_len = dmat->maxsize;
+	cb(cb_arg, &stack_sg, /*nseg*/1, /*error*/0);
+	return (0);
+}
+
+void
+ahd_dmamap_destroy(struct ahd_softc *ahd, bus_dma_tag_t dmat, bus_dmamap_t map)
+{
+}
+
+int
+ahd_dmamap_unload(struct ahd_softc *ahd, bus_dma_tag_t dmat, bus_dmamap_t map)
+{
+	/* Nothing to do */
+	return (0);
+}
+
+/********************* Platform Dependent Functions ***************************/
+static void
+ahd_linux_setup_iocell_info(u_long index, int instance, int targ, int32_t value)
+{
+
+	if ((instance >= 0)
+	 && (instance < ARRAY_SIZE(aic79xx_iocell_info))) {
+		uint8_t *iocell_info;
+
+		iocell_info = (uint8_t*)&aic79xx_iocell_info[instance];
+		iocell_info[index] = value & 0xFFFF;
+		if (bootverbose)
+			printk("iocell[%d:%ld] = %d\n", instance, index, value);
+	}
+}
+
+static void
+ahd_linux_setup_tag_info_global(char *p)
+{
+	int tags, i, j;
+
+	tags = simple_strtoul(p + 1, NULL, 0) & 0xff;
+	printk("Setting Global Tags= %d\n", tags);
+
+	for (i = 0; i < ARRAY_SIZE(aic79xx_tag_info); i++) {
+		for (j = 0; j < AHD_NUM_TARGETS; j++) {
+			aic79xx_tag_info[i].tag_commands[j] = tags;
+		}
+	}
+}
+
+static void
+ahd_linux_setup_tag_info(u_long arg, int instance, int targ, int32_t value)
+{
+
+	if ((instance >= 0) && (targ >= 0)
+	 && (instance < ARRAY_SIZE(aic79xx_tag_info))
+	 && (targ < AHD_NUM_TARGETS)) {
+		aic79xx_tag_info[instance].tag_commands[targ] = value & 0x1FF;
+		if (bootverbose)
+			printk("tag_info[%d:%d] = %d\n", instance, targ, value);
+	}
+}
+
+static char *
+ahd_parse_brace_option(char *opt_name, char *opt_arg, char *end, int depth,
+		       void (*callback)(u_long, int, int, int32_t),
+		       u_long callback_arg)
+{
+	char	*tok_end;
+	char	*tok_end2;
+	int      i;
+	int      instance;
+	int	 targ;
+	int	 done;
+	char	 tok_list[] = {'.', ',', '{', '}', '\0'};
+
+	/* All options use a ':' name/arg separator */
+	if (*opt_arg != ':')
+		return (opt_arg);
+	opt_arg++;
+	instance = -1;
+	targ = -1;
+	done = FALSE;
+	/*
+	 * Restore separator that may be in
+	 * the middle of our option argument.
+	 */
+	tok_end = strchr(opt_arg, '\0');
+	if (tok_end < end)
+		*tok_end = ',';
+	while (!done) {
+		switch (*opt_arg) {
+		case '{':
+			if (instance == -1) {
+				instance = 0;
+			} else {
+				if (depth > 1) {
+					if (targ == -1)
+						targ = 0;
+				} else {
+					printk("Malformed Option %s\n",
+					       opt_name);
+					done = TRUE;
+				}
+			}
+			opt_arg++;
+			break;
+		case '}':
+			if (targ != -1)
+				targ = -1;
+			else if (instance != -1)
+				instance = -1;
+			opt_arg++;
+			break;
+		case ',':
+		case '.':
+			if (instance == -1)
+				done = TRUE;
+			else if (targ >= 0)
+				targ++;
+			else if (instance >= 0)
+				instance++;
+			opt_arg++;
+			break;
+		case '\0':
+			done = TRUE;
+			break;
+		default:
+			tok_end = end;
+			for (i = 0; tok_list[i]; i++) {
+				tok_end2 = strchr(opt_arg, tok_list[i]);
+				if ((tok_end2) && (tok_end2 < tok_end))
+					tok_end = tok_end2;
+			}
+			callback(callback_arg, instance, targ,
+				 simple_strtol(opt_arg, NULL, 0));
+			opt_arg = tok_end;
+			break;
+		}
+	}
+	return (opt_arg);
+}
+
+/*
+ * Handle Linux boot parameters. This routine allows for assigning a value
+ * to a parameter with a ':' between the parameter and the value.
+ * ie. aic79xx=stpwlev:1,extended
+ */
+static int
+aic79xx_setup(char *s)
+{
+	int	i, n;
+	char   *p;
+	char   *end;
+
+	static const struct {
+		const char *name;
+		uint32_t *flag;
+	} options[] = {
+		{ "extended", &aic79xx_extended },
+		{ "no_reset", &aic79xx_no_reset },
+		{ "verbose", &aic79xx_verbose },
+		{ "allow_memio", &aic79xx_allow_memio},
+#ifdef AHD_DEBUG
+		{ "debug", &ahd_debug },
+#endif
+		{ "periodic_otag", &aic79xx_periodic_otag },
+		{ "pci_parity", &aic79xx_pci_parity },
+		{ "seltime", &aic79xx_seltime },
+		{ "tag_info", NULL },
+		{ "global_tag_depth", NULL},
+		{ "slewrate", NULL },
+		{ "precomp", NULL },
+		{ "amplitude", NULL },
+		{ "slowcrc", &aic79xx_slowcrc },
+	};
+
+	end = strchr(s, '\0');
+
+	/*
+	 * XXX ia64 gcc isn't smart enough to know that ARRAY_SIZE
+	 * will never be 0 in this case.
+	 */
+	n = 0;
+
+	while ((p = strsep(&s, ",.")) != NULL) {
+		if (*p == '\0')
+			continue;
+		for (i = 0; i < ARRAY_SIZE(options); i++) {
+
+			n = strlen(options[i].name);
+			if (strncmp(options[i].name, p, n) == 0)
+				break;
+		}
+		if (i == ARRAY_SIZE(options))
+			continue;
+
+		if (strncmp(p, "global_tag_depth", n) == 0) {
+			ahd_linux_setup_tag_info_global(p + n);
+		} else if (strncmp(p, "tag_info", n) == 0) {
+			s = ahd_parse_brace_option("tag_info", p + n, end,
+			    2, ahd_linux_setup_tag_info, 0);
+		} else if (strncmp(p, "slewrate", n) == 0) {
+			s = ahd_parse_brace_option("slewrate",
+			    p + n, end, 1, ahd_linux_setup_iocell_info,
+			    AIC79XX_SLEWRATE_INDEX);
+		} else if (strncmp(p, "precomp", n) == 0) {
+			s = ahd_parse_brace_option("precomp",
+			    p + n, end, 1, ahd_linux_setup_iocell_info,
+			    AIC79XX_PRECOMP_INDEX);
+		} else if (strncmp(p, "amplitude", n) == 0) {
+			s = ahd_parse_brace_option("amplitude",
+			    p + n, end, 1, ahd_linux_setup_iocell_info,
+			    AIC79XX_AMPLITUDE_INDEX);
+		} else if (p[n] == ':') {
+			*(options[i].flag) = simple_strtoul(p + n + 1, NULL, 0);
+		} else if (!strncmp(p, "verbose", n)) {
+			*(options[i].flag) = 1;
+		} else {
+			*(options[i].flag) ^= 0xFFFFFFFF;
+		}
+	}
+	return 1;
+}
+
+__setup("aic79xx=", aic79xx_setup);
+
+uint32_t aic79xx_verbose;
+
+int
+ahd_linux_register_host(struct ahd_softc *ahd, struct scsi_host_template *template)
+{
+	char	buf[80];
+	struct	Scsi_Host *host;
+	char	*new_name;
+	u_long	s;
+	int	retval;
+
+	template->name = ahd->description;
+	host = scsi_host_alloc(template, sizeof(struct ahd_softc *));
+	if (host == NULL)
+		return (ENOMEM);
+
+	*((struct ahd_softc **)host->hostdata) = ahd;
+	ahd->platform_data->host = host;
+	host->can_queue = AHD_MAX_QUEUE;
+	host->cmd_per_lun = 2;
+	host->sg_tablesize = AHD_NSEG;
+	host->this_id = ahd->our_id;
+	host->irq = ahd->platform_data->irq;
+	host->max_id = (ahd->features & AHD_WIDE) ? 16 : 8;
+	host->max_lun = AHD_NUM_LUNS;
+	host->max_channel = 0;
+	host->sg_tablesize = AHD_NSEG;
+	ahd_lock(ahd, &s);
+	ahd_set_unit(ahd, ahd_linux_unit++);
+	ahd_unlock(ahd, &s);
+	sprintf(buf, "scsi%d", host->host_no);
+	new_name = kmalloc(strlen(buf) + 1, GFP_ATOMIC);
+	if (new_name != NULL) {
+		strcpy(new_name, buf);
+		ahd_set_name(ahd, new_name);
+	}
+	host->unique_id = ahd->unit;
+	ahd_linux_initialize_scsi_bus(ahd);
+	ahd_intr_enable(ahd, TRUE);
+
+	host->transportt = ahd_linux_transport_template;
+
+	retval = scsi_add_host(host, &ahd->dev_softc->dev);
+	if (retval) {
+		printk(KERN_WARNING "aic79xx: scsi_add_host failed\n");
+		scsi_host_put(host);
+		return retval;
+	}
+
+	scsi_scan_host(host);
+	return 0;
+}
+
+/*
+ * Place the SCSI bus into a known state by either resetting it,
+ * or forcing transfer negotiations on the next command to any
+ * target.
+ */
+static void
+ahd_linux_initialize_scsi_bus(struct ahd_softc *ahd)
+{
+	u_int target_id;
+	u_int numtarg;
+	unsigned long s;
+
+	target_id = 0;
+	numtarg = 0;
+
+	if (aic79xx_no_reset != 0)
+		ahd->flags &= ~AHD_RESET_BUS_A;
+
+	if ((ahd->flags & AHD_RESET_BUS_A) != 0)
+		ahd_reset_channel(ahd, 'A', /*initiate_reset*/TRUE);
+	else
+		numtarg = (ahd->features & AHD_WIDE) ? 16 : 8;
+
+	ahd_lock(ahd, &s);
+
+	/*
+	 * Force negotiation to async for all targets that
+	 * will not see an initial bus reset.
+	 */
+	for (; target_id < numtarg; target_id++) {
+		struct ahd_devinfo devinfo;
+		struct ahd_initiator_tinfo *tinfo;
+		struct ahd_tmode_tstate *tstate;
+
+		tinfo = ahd_fetch_transinfo(ahd, 'A', ahd->our_id,
+					    target_id, &tstate);
+		ahd_compile_devinfo(&devinfo, ahd->our_id, target_id,
+				    CAM_LUN_WILDCARD, 'A', ROLE_INITIATOR);
+		ahd_update_neg_request(ahd, &devinfo, tstate,
+				       tinfo, AHD_NEG_ALWAYS);
+	}
+	ahd_unlock(ahd, &s);
+	/* Give the bus some time to recover */
+	if ((ahd->flags & AHD_RESET_BUS_A) != 0) {
+		ahd_freeze_simq(ahd);
+		msleep(AIC79XX_RESET_DELAY);
+		ahd_release_simq(ahd);
+	}
+}
+
+int
+ahd_platform_alloc(struct ahd_softc *ahd, void *platform_arg)
+{
+	ahd->platform_data =
+	    kzalloc(sizeof(struct ahd_platform_data), GFP_ATOMIC);
+	if (ahd->platform_data == NULL)
+		return (ENOMEM);
+	ahd->platform_data->irq = AHD_LINUX_NOIRQ;
+	ahd_lockinit(ahd);
+	ahd->seltime = (aic79xx_seltime & 0x3) << 4;
+	return (0);
+}
+
+void
+ahd_platform_free(struct ahd_softc *ahd)
+{
+	struct scsi_target *starget;
+	int i;
+
+	if (ahd->platform_data != NULL) {
+		/* destroy all of the device and target objects */
+		for (i = 0; i < AHD_NUM_TARGETS; i++) {
+			starget = ahd->platform_data->starget[i];
+			if (starget != NULL) {
+				ahd->platform_data->starget[i] = NULL;
+			}
+		}
+
+		if (ahd->platform_data->irq != AHD_LINUX_NOIRQ)
+			free_irq(ahd->platform_data->irq, ahd);
+		if (ahd->tags[0] == BUS_SPACE_PIO
+		 && ahd->bshs[0].ioport != 0)
+			release_region(ahd->bshs[0].ioport, 256);
+		if (ahd->tags[1] == BUS_SPACE_PIO
+		 && ahd->bshs[1].ioport != 0)
+			release_region(ahd->bshs[1].ioport, 256);
+		if (ahd->tags[0] == BUS_SPACE_MEMIO
+		 && ahd->bshs[0].maddr != NULL) {
+			iounmap(ahd->bshs[0].maddr);
+			release_mem_region(ahd->platform_data->mem_busaddr,
+					   0x1000);
+		}
+		if (ahd->platform_data->host)
+			scsi_host_put(ahd->platform_data->host);
+
+		kfree(ahd->platform_data);
+	}
+}
+
+void
+ahd_platform_init(struct ahd_softc *ahd)
+{
+	/*
+	 * Lookup and commit any modified IO Cell options.
+	 */
+	if (ahd->unit < ARRAY_SIZE(aic79xx_iocell_info)) {
+		const struct ahd_linux_iocell_opts *iocell_opts;
+
+		iocell_opts = &aic79xx_iocell_info[ahd->unit];
+		if (iocell_opts->precomp != AIC79XX_DEFAULT_PRECOMP)
+			AHD_SET_PRECOMP(ahd, iocell_opts->precomp);
+		if (iocell_opts->slewrate != AIC79XX_DEFAULT_SLEWRATE)
+			AHD_SET_SLEWRATE(ahd, iocell_opts->slewrate);
+		if (iocell_opts->amplitude != AIC79XX_DEFAULT_AMPLITUDE)
+			AHD_SET_AMPLITUDE(ahd, iocell_opts->amplitude);
+	}
+
+}
+
+void
+ahd_platform_freeze_devq(struct ahd_softc *ahd, struct scb *scb)
+{
+	ahd_platform_abort_scbs(ahd, SCB_GET_TARGET(ahd, scb),
+				SCB_GET_CHANNEL(ahd, scb),
+				SCB_GET_LUN(scb), SCB_LIST_NULL,
+				ROLE_UNKNOWN, CAM_REQUEUE_REQ);
+}
+
+void
+ahd_platform_set_tags(struct ahd_softc *ahd, struct scsi_device *sdev,
+		      struct ahd_devinfo *devinfo, ahd_queue_alg alg)
+{
+	struct ahd_linux_device *dev;
+	int was_queuing;
+	int now_queuing;
+
+	if (sdev == NULL)
+		return;
+
+	dev = scsi_transport_device_data(sdev);
+
+	if (dev == NULL)
+		return;
+	was_queuing = dev->flags & (AHD_DEV_Q_BASIC|AHD_DEV_Q_TAGGED);
+	switch (alg) {
+	default:
+	case AHD_QUEUE_NONE:
+		now_queuing = 0;
+		break; 
+	case AHD_QUEUE_BASIC:
+		now_queuing = AHD_DEV_Q_BASIC;
+		break;
+	case AHD_QUEUE_TAGGED:
+		now_queuing = AHD_DEV_Q_TAGGED;
+		break;
+	}
+	if ((dev->flags & AHD_DEV_FREEZE_TIL_EMPTY) == 0
+	 && (was_queuing != now_queuing)
+	 && (dev->active != 0)) {
+		dev->flags |= AHD_DEV_FREEZE_TIL_EMPTY;
+		dev->qfrozen++;
+	}
+
+	dev->flags &= ~(AHD_DEV_Q_BASIC|AHD_DEV_Q_TAGGED|AHD_DEV_PERIODIC_OTAG);
+	if (now_queuing) {
+		u_int usertags;
+
+		usertags = ahd_linux_user_tagdepth(ahd, devinfo);
+		if (!was_queuing) {
+			/*
+			 * Start out aggressively and allow our
+			 * dynamic queue depth algorithm to take
+			 * care of the rest.
+			 */
+			dev->maxtags = usertags;
+			dev->openings = dev->maxtags - dev->active;
+		}
+		if (dev->maxtags == 0) {
+			/*
+			 * Queueing is disabled by the user.
+			 */
+			dev->openings = 1;
+		} else if (alg == AHD_QUEUE_TAGGED) {
+			dev->flags |= AHD_DEV_Q_TAGGED;
+			if (aic79xx_periodic_otag != 0)
+				dev->flags |= AHD_DEV_PERIODIC_OTAG;
+		} else
+			dev->flags |= AHD_DEV_Q_BASIC;
+	} else {
+		/* We can only have one opening. */
+		dev->maxtags = 0;
+		dev->openings =  1 - dev->active;
+	}
+
+	switch ((dev->flags & (AHD_DEV_Q_BASIC|AHD_DEV_Q_TAGGED))) {
+	case AHD_DEV_Q_BASIC:
+	case AHD_DEV_Q_TAGGED:
+		scsi_change_queue_depth(sdev,
+				dev->openings + dev->active);
+		break;
+	default:
+		/*
+		 * We allow the OS to queue 2 untagged transactions to
+		 * us at any time even though we can only execute them
+		 * serially on the controller/device.  This should
+		 * remove some latency.
+		 */
+		scsi_change_queue_depth(sdev, 1);
+		break;
+	}
+}
+
+int
+ahd_platform_abort_scbs(struct ahd_softc *ahd, int target, char channel,
+			int lun, u_int tag, role_t role, uint32_t status)
+{
+	return 0;
+}
+
+static u_int
+ahd_linux_user_tagdepth(struct ahd_softc *ahd, struct ahd_devinfo *devinfo)
+{
+	static int warned_user;
+	u_int tags;
+
+	tags = 0;
+	if ((ahd->user_discenable & devinfo->target_mask) != 0) {
+		if (ahd->unit >= ARRAY_SIZE(aic79xx_tag_info)) {
+
+			if (warned_user == 0) {
+				printk(KERN_WARNING
+"aic79xx: WARNING: Insufficient tag_info instances\n"
+"aic79xx: for installed controllers.  Using defaults\n"
+"aic79xx: Please update the aic79xx_tag_info array in\n"
+"aic79xx: the aic79xx_osm.c source file.\n");
+				warned_user++;
+			}
+			tags = AHD_MAX_QUEUE;
+		} else {
+			adapter_tag_info_t *tag_info;
+
+			tag_info = &aic79xx_tag_info[ahd->unit];
+			tags = tag_info->tag_commands[devinfo->target_offset];
+			if (tags > AHD_MAX_QUEUE)
+				tags = AHD_MAX_QUEUE;
+		}
+	}
+	return (tags);
+}
+
+/*
+ * Determines the queue depth for a given device.
+ */
+static void
+ahd_linux_device_queue_depth(struct scsi_device *sdev)
+{
+	struct	ahd_devinfo devinfo;
+	u_int	tags;
+	struct ahd_softc *ahd = *((struct ahd_softc **)sdev->host->hostdata);
+
+	ahd_compile_devinfo(&devinfo,
+			    ahd->our_id,
+			    sdev->sdev_target->id, sdev->lun,
+			    sdev->sdev_target->channel == 0 ? 'A' : 'B',
+			    ROLE_INITIATOR);
+	tags = ahd_linux_user_tagdepth(ahd, &devinfo);
+	if (tags != 0 && sdev->tagged_supported != 0) {
+
+		ahd_platform_set_tags(ahd, sdev, &devinfo, AHD_QUEUE_TAGGED);
+		ahd_send_async(ahd, devinfo.channel, devinfo.target,
+			       devinfo.lun, AC_TRANSFER_NEG);
+		ahd_print_devinfo(ahd, &devinfo);
+		printk("Tagged Queuing enabled.  Depth %d\n", tags);
+	} else {
+		ahd_platform_set_tags(ahd, sdev, &devinfo, AHD_QUEUE_NONE);
+		ahd_send_async(ahd, devinfo.channel, devinfo.target,
+			       devinfo.lun, AC_TRANSFER_NEG);
+	}
+}
+
+static int
+ahd_linux_run_command(struct ahd_softc *ahd, struct ahd_linux_device *dev,
+		      struct scsi_cmnd *cmd)
+{
+	struct	 scb *scb;
+	struct	 hardware_scb *hscb;
+	struct	 ahd_initiator_tinfo *tinfo;
+	struct	 ahd_tmode_tstate *tstate;
+	u_int	 col_idx;
+	uint16_t mask;
+	unsigned long flags;
+	int nseg;
+
+	nseg = scsi_dma_map(cmd);
+	if (nseg < 0)
+		return SCSI_MLQUEUE_HOST_BUSY;
+
+	ahd_lock(ahd, &flags);
+
+	/*
+	 * Get an scb to use.
+	 */
+	tinfo = ahd_fetch_transinfo(ahd, 'A', ahd->our_id,
+				    cmd->device->id, &tstate);
+	if ((dev->flags & (AHD_DEV_Q_TAGGED|AHD_DEV_Q_BASIC)) == 0
+	 || (tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ) != 0) {
+		col_idx = AHD_NEVER_COL_IDX;
+	} else {
+		col_idx = AHD_BUILD_COL_IDX(cmd->device->id,
+					    cmd->device->lun);
+	}
+	if ((scb = ahd_get_scb(ahd, col_idx)) == NULL) {
+		ahd->flags |= AHD_RESOURCE_SHORTAGE;
+		ahd_unlock(ahd, &flags);
+		scsi_dma_unmap(cmd);
+		return SCSI_MLQUEUE_HOST_BUSY;
+	}
+
+	scb->io_ctx = cmd;
+	scb->platform_data->dev = dev;
+	hscb = scb->hscb;
+	cmd->host_scribble = (char *)scb;
+
+	/*
+	 * Fill out basics of the HSCB.
+	 */
+	hscb->control = 0;
+	hscb->scsiid = BUILD_SCSIID(ahd, cmd);
+	hscb->lun = cmd->device->lun;
+	scb->hscb->task_management = 0;
+	mask = SCB_GET_TARGET_MASK(ahd, scb);
+
+	if ((ahd->user_discenable & mask) != 0)
+		hscb->control |= DISCENB;
+
+	if ((tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ) != 0)
+		scb->flags |= SCB_PACKETIZED;
+
+	if ((tstate->auto_negotiate & mask) != 0) {
+		scb->flags |= SCB_AUTO_NEGOTIATE;
+		scb->hscb->control |= MK_MESSAGE;
+	}
+
+	if ((dev->flags & (AHD_DEV_Q_TAGGED|AHD_DEV_Q_BASIC)) != 0) {
+		if (dev->commands_since_idle_or_otag == AHD_OTAG_THRESH
+		 && (dev->flags & AHD_DEV_Q_TAGGED) != 0) {
+			hscb->control |= ORDERED_QUEUE_TAG;
+			dev->commands_since_idle_or_otag = 0;
+		} else {
+			hscb->control |= SIMPLE_QUEUE_TAG;
+		}
+	}
+
+	hscb->cdb_len = cmd->cmd_len;
+	memcpy(hscb->shared_data.idata.cdb, cmd->cmnd, hscb->cdb_len);
+
+	scb->platform_data->xfer_len = 0;
+	ahd_set_residual(scb, 0);
+	ahd_set_sense_residual(scb, 0);
+	scb->sg_count = 0;
+
+	if (nseg > 0) {
+		void *sg = scb->sg_list;
+		struct scatterlist *cur_seg;
+		int i;
+
+		scb->platform_data->xfer_len = 0;
+
+		scsi_for_each_sg(cmd, cur_seg, nseg, i) {
+			dma_addr_t addr;
+			bus_size_t len;
+
+			addr = sg_dma_address(cur_seg);
+			len = sg_dma_len(cur_seg);
+			scb->platform_data->xfer_len += len;
+			sg = ahd_sg_setup(ahd, scb, sg, addr, len,
+					  i == (nseg - 1));
+		}
+	}
+
+	LIST_INSERT_HEAD(&ahd->pending_scbs, scb, pending_links);
+	dev->openings--;
+	dev->active++;
+	dev->commands_issued++;
+
+	if ((dev->flags & AHD_DEV_PERIODIC_OTAG) != 0)
+		dev->commands_since_idle_or_otag++;
+	scb->flags |= SCB_ACTIVE;
+	ahd_queue_scb(ahd, scb);
+
+	ahd_unlock(ahd, &flags);
+
+	return 0;
+}
+
+/*
+ * SCSI controller interrupt handler.
+ */
+irqreturn_t
+ahd_linux_isr(int irq, void *dev_id)
+{
+	struct	ahd_softc *ahd;
+	u_long	flags;
+	int	ours;
+
+	ahd = (struct ahd_softc *) dev_id;
+	ahd_lock(ahd, &flags); 
+	ours = ahd_intr(ahd);
+	ahd_unlock(ahd, &flags);
+	return IRQ_RETVAL(ours);
+}
+
+void
+ahd_send_async(struct ahd_softc *ahd, char channel,
+	       u_int target, u_int lun, ac_code code)
+{
+	switch (code) {
+	case AC_TRANSFER_NEG:
+	{
+		struct  scsi_target *starget;
+		struct	ahd_initiator_tinfo *tinfo;
+		struct	ahd_tmode_tstate *tstate;
+		unsigned int target_ppr_options;
+
+		BUG_ON(target == CAM_TARGET_WILDCARD);
+
+		tinfo = ahd_fetch_transinfo(ahd, channel, ahd->our_id,
+					    target, &tstate);
+
+		/*
+		 * Don't bother reporting results while
+		 * negotiations are still pending.
+		 */
+		if (tinfo->curr.period != tinfo->goal.period
+		 || tinfo->curr.width != tinfo->goal.width
+		 || tinfo->curr.offset != tinfo->goal.offset
+		 || tinfo->curr.ppr_options != tinfo->goal.ppr_options)
+			if (bootverbose == 0)
+				break;
+
+		/*
+		 * Don't bother reporting results that
+		 * are identical to those last reported.
+		 */
+		starget = ahd->platform_data->starget[target];
+		if (starget == NULL)
+			break;
+
+		target_ppr_options =
+			(spi_dt(starget) ? MSG_EXT_PPR_DT_REQ : 0)
+			+ (spi_qas(starget) ? MSG_EXT_PPR_QAS_REQ : 0)
+			+ (spi_iu(starget) ?  MSG_EXT_PPR_IU_REQ : 0)
+			+ (spi_rd_strm(starget) ? MSG_EXT_PPR_RD_STRM : 0)
+			+ (spi_pcomp_en(starget) ? MSG_EXT_PPR_PCOMP_EN : 0)
+			+ (spi_rti(starget) ? MSG_EXT_PPR_RTI : 0)
+			+ (spi_wr_flow(starget) ? MSG_EXT_PPR_WR_FLOW : 0)
+			+ (spi_hold_mcs(starget) ? MSG_EXT_PPR_HOLD_MCS : 0);
+
+		if (tinfo->curr.period == spi_period(starget)
+		    && tinfo->curr.width == spi_width(starget)
+		    && tinfo->curr.offset == spi_offset(starget)
+		 && tinfo->curr.ppr_options == target_ppr_options)
+			if (bootverbose == 0)
+				break;
+
+		spi_period(starget) = tinfo->curr.period;
+		spi_width(starget) = tinfo->curr.width;
+		spi_offset(starget) = tinfo->curr.offset;
+		spi_dt(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_DT_REQ ? 1 : 0;
+		spi_qas(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_QAS_REQ ? 1 : 0;
+		spi_iu(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ ? 1 : 0;
+		spi_rd_strm(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_RD_STRM ? 1 : 0;
+		spi_pcomp_en(starget) =  tinfo->curr.ppr_options & MSG_EXT_PPR_PCOMP_EN ? 1 : 0;
+		spi_rti(starget) =  tinfo->curr.ppr_options &  MSG_EXT_PPR_RTI ? 1 : 0;
+		spi_wr_flow(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_WR_FLOW ? 1 : 0;
+		spi_hold_mcs(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_HOLD_MCS ? 1 : 0;
+		spi_display_xfer_agreement(starget);
+		break;
+	}
+        case AC_SENT_BDR:
+	{
+		WARN_ON(lun != CAM_LUN_WILDCARD);
+		scsi_report_device_reset(ahd->platform_data->host,
+					 channel - 'A', target);
+		break;
+	}
+        case AC_BUS_RESET:
+		if (ahd->platform_data->host != NULL) {
+			scsi_report_bus_reset(ahd->platform_data->host,
+					      channel - 'A');
+		}
+                break;
+        default:
+                panic("ahd_send_async: Unexpected async event");
+        }
+}
+
+/*
+ * Calls the higher level scsi done function and frees the scb.
+ */
+void
+ahd_done(struct ahd_softc *ahd, struct scb *scb)
+{
+	struct scsi_cmnd *cmd;
+	struct	  ahd_linux_device *dev;
+
+	if ((scb->flags & SCB_ACTIVE) == 0) {
+		printk("SCB %d done'd twice\n", SCB_GET_TAG(scb));
+		ahd_dump_card_state(ahd);
+		panic("Stopping for safety");
+	}
+	LIST_REMOVE(scb, pending_links);
+	cmd = scb->io_ctx;
+	dev = scb->platform_data->dev;
+	dev->active--;
+	dev->openings++;
+	if ((cmd->result & (CAM_DEV_QFRZN << 16)) != 0) {
+		cmd->result &= ~(CAM_DEV_QFRZN << 16);
+		dev->qfrozen--;
+	}
+	ahd_linux_unmap_scb(ahd, scb);
+
+	/*
+	 * Guard against stale sense data.
+	 * The Linux mid-layer assumes that sense
+	 * was retrieved anytime the first byte of
+	 * the sense buffer looks "sane".
+	 */
+	cmd->sense_buffer[0] = 0;
+	if (ahd_get_transaction_status(scb) == CAM_REQ_INPROG) {
+#ifdef AHD_REPORT_UNDERFLOWS
+		uint32_t amount_xferred;
+
+		amount_xferred =
+		    ahd_get_transfer_length(scb) - ahd_get_residual(scb);
+#endif
+		if ((scb->flags & SCB_TRANSMISSION_ERROR) != 0) {
+#ifdef AHD_DEBUG
+			if ((ahd_debug & AHD_SHOW_MISC) != 0) {
+				ahd_print_path(ahd, scb);
+				printk("Set CAM_UNCOR_PARITY\n");
+			}
+#endif
+			ahd_set_transaction_status(scb, CAM_UNCOR_PARITY);
+#ifdef AHD_REPORT_UNDERFLOWS
+		/*
+		 * This code is disabled by default as some
+		 * clients of the SCSI system do not properly
+		 * initialize the underflow parameter.  This
+		 * results in spurious termination of commands
+		 * that complete as expected (e.g. underflow is
+		 * allowed as command can return variable amounts
+		 * of data.
+		 */
+		} else if (amount_xferred < scb->io_ctx->underflow) {
+			u_int i;
+
+			ahd_print_path(ahd, scb);
+			printk("CDB:");
+			for (i = 0; i < scb->io_ctx->cmd_len; i++)
+				printk(" 0x%x", scb->io_ctx->cmnd[i]);
+			printk("\n");
+			ahd_print_path(ahd, scb);
+			printk("Saw underflow (%ld of %ld bytes). "
+			       "Treated as error\n",
+				ahd_get_residual(scb),
+				ahd_get_transfer_length(scb));
+			ahd_set_transaction_status(scb, CAM_DATA_RUN_ERR);
+#endif
+		} else {
+			ahd_set_transaction_status(scb, CAM_REQ_CMP);
+		}
+	} else if (ahd_get_transaction_status(scb) == CAM_SCSI_STATUS_ERROR) {
+		ahd_linux_handle_scsi_status(ahd, cmd->device, scb);
+	}
+
+	if (dev->openings == 1
+	 && ahd_get_transaction_status(scb) == CAM_REQ_CMP
+	 && ahd_get_scsi_status(scb) != SAM_STAT_TASK_SET_FULL)
+		dev->tag_success_count++;
+	/*
+	 * Some devices deal with temporary internal resource
+	 * shortages by returning queue full.  When the queue
+	 * full occurrs, we throttle back.  Slowly try to get
+	 * back to our previous queue depth.
+	 */
+	if ((dev->openings + dev->active) < dev->maxtags
+	 && dev->tag_success_count > AHD_TAG_SUCCESS_INTERVAL) {
+		dev->tag_success_count = 0;
+		dev->openings++;
+	}
+
+	if (dev->active == 0)
+		dev->commands_since_idle_or_otag = 0;
+
+	if ((scb->flags & SCB_RECOVERY_SCB) != 0) {
+		printk("Recovery SCB completes\n");
+		if (ahd_get_transaction_status(scb) == CAM_BDR_SENT
+		 || ahd_get_transaction_status(scb) == CAM_REQ_ABORTED)
+			ahd_set_transaction_status(scb, CAM_CMD_TIMEOUT);
+
+		if (ahd->platform_data->eh_done)
+			complete(ahd->platform_data->eh_done);
+	}
+
+	ahd_free_scb(ahd, scb);
+	ahd_linux_queue_cmd_complete(ahd, cmd);
+}
+
+static void
+ahd_linux_handle_scsi_status(struct ahd_softc *ahd,
+			     struct scsi_device *sdev, struct scb *scb)
+{
+	struct	ahd_devinfo devinfo;
+	struct ahd_linux_device *dev = scsi_transport_device_data(sdev);
+
+	ahd_compile_devinfo(&devinfo,
+			    ahd->our_id,
+			    sdev->sdev_target->id, sdev->lun,
+			    sdev->sdev_target->channel == 0 ? 'A' : 'B',
+			    ROLE_INITIATOR);
+	
+	/*
+	 * We don't currently trust the mid-layer to
+	 * properly deal with queue full or busy.  So,
+	 * when one occurs, we tell the mid-layer to
+	 * unconditionally requeue the command to us
+	 * so that we can retry it ourselves.  We also
+	 * implement our own throttling mechanism so
+	 * we don't clobber the device with too many
+	 * commands.
+	 */
+	switch (ahd_get_scsi_status(scb)) {
+	default:
+		break;
+	case SAM_STAT_CHECK_CONDITION:
+	case SAM_STAT_COMMAND_TERMINATED:
+	{
+		struct scsi_cmnd *cmd;
+
+		/*
+		 * Copy sense information to the OS's cmd
+		 * structure if it is available.
+		 */
+		cmd = scb->io_ctx;
+		if ((scb->flags & (SCB_SENSE|SCB_PKT_SENSE)) != 0) {
+			struct scsi_status_iu_header *siu;
+			u_int sense_size;
+			u_int sense_offset;
+
+			if (scb->flags & SCB_SENSE) {
+				sense_size = min(sizeof(struct scsi_sense_data)
+					       - ahd_get_sense_residual(scb),
+						 (u_long)SCSI_SENSE_BUFFERSIZE);
+				sense_offset = 0;
+			} else {
+				/*
+				 * Copy only the sense data into the provided
+				 * buffer.
+				 */
+				siu = (struct scsi_status_iu_header *)
+				    scb->sense_data;
+				sense_size = min_t(size_t,
+						scsi_4btoul(siu->sense_length),
+						SCSI_SENSE_BUFFERSIZE);
+				sense_offset = SIU_SENSE_OFFSET(siu);
+			}
+
+			memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
+			memcpy(cmd->sense_buffer,
+			       ahd_get_sense_buf(ahd, scb)
+			       + sense_offset, sense_size);
+			set_status_byte(cmd, SAM_STAT_CHECK_CONDITION);
+
+#ifdef AHD_DEBUG
+			if (ahd_debug & AHD_SHOW_SENSE) {
+				int i;
+
+				printk("Copied %d bytes of sense data at %d:",
+				       sense_size, sense_offset);
+				for (i = 0; i < sense_size; i++) {
+					if ((i & 0xF) == 0)
+						printk("\n");
+					printk("0x%x ", cmd->sense_buffer[i]);
+				}
+				printk("\n");
+			}
+#endif
+		}
+		break;
+	}
+	case SAM_STAT_TASK_SET_FULL:
+		/*
+		 * By the time the core driver has returned this
+		 * command, all other commands that were queued
+		 * to us but not the device have been returned.
+		 * This ensures that dev->active is equal to
+		 * the number of commands actually queued to
+		 * the device.
+		 */
+		dev->tag_success_count = 0;
+		if (dev->active != 0) {
+			/*
+			 * Drop our opening count to the number
+			 * of commands currently outstanding.
+			 */
+			dev->openings = 0;
+#ifdef AHD_DEBUG
+			if ((ahd_debug & AHD_SHOW_QFULL) != 0) {
+				ahd_print_path(ahd, scb);
+				printk("Dropping tag count to %d\n",
+				       dev->active);
+			}
+#endif
+			if (dev->active == dev->tags_on_last_queuefull) {
+
+				dev->last_queuefull_same_count++;
+				/*
+				 * If we repeatedly see a queue full
+				 * at the same queue depth, this
+				 * device has a fixed number of tag
+				 * slots.  Lock in this tag depth
+				 * so we stop seeing queue fulls from
+				 * this device.
+				 */
+				if (dev->last_queuefull_same_count
+				 == AHD_LOCK_TAGS_COUNT) {
+					dev->maxtags = dev->active;
+					ahd_print_path(ahd, scb);
+					printk("Locking max tag count at %d\n",
+					       dev->active);
+				}
+			} else {
+				dev->tags_on_last_queuefull = dev->active;
+				dev->last_queuefull_same_count = 0;
+			}
+			ahd_set_transaction_status(scb, CAM_REQUEUE_REQ);
+			ahd_set_scsi_status(scb, SAM_STAT_GOOD);
+			ahd_platform_set_tags(ahd, sdev, &devinfo,
+				     (dev->flags & AHD_DEV_Q_BASIC)
+				   ? AHD_QUEUE_BASIC : AHD_QUEUE_TAGGED);
+			break;
+		}
+		/*
+		 * Drop down to a single opening, and treat this
+		 * as if the target returned BUSY SCSI status.
+		 */
+		dev->openings = 1;
+		ahd_platform_set_tags(ahd, sdev, &devinfo,
+			     (dev->flags & AHD_DEV_Q_BASIC)
+			   ? AHD_QUEUE_BASIC : AHD_QUEUE_TAGGED);
+		ahd_set_scsi_status(scb, SAM_STAT_BUSY);
+	}
+}
+
+static void
+ahd_linux_queue_cmd_complete(struct ahd_softc *ahd, struct scsi_cmnd *cmd)
+{
+	int status;
+	int new_status = DID_OK;
+	int do_fallback = 0;
+	int scsi_status;
+	struct scsi_sense_data *sense;
+
+	/*
+	 * Map CAM error codes into Linux Error codes.  We
+	 * avoid the conversion so that the DV code has the
+	 * full error information available when making
+	 * state change decisions.
+	 */
+
+	status = ahd_cmd_get_transaction_status(cmd);
+	switch (status) {
+	case CAM_REQ_INPROG:
+	case CAM_REQ_CMP:
+		new_status = DID_OK;
+		break;
+	case CAM_AUTOSENSE_FAIL:
+		new_status = DID_ERROR;
+		fallthrough;
+	case CAM_SCSI_STATUS_ERROR:
+		scsi_status = ahd_cmd_get_scsi_status(cmd);
+
+		switch(scsi_status) {
+		case SAM_STAT_COMMAND_TERMINATED:
+		case SAM_STAT_CHECK_CONDITION:
+			sense = (struct scsi_sense_data *)
+				cmd->sense_buffer;
+			if (sense->extra_len >= 5 &&
+			    (sense->add_sense_code == 0x47
+			     || sense->add_sense_code == 0x48))
+				do_fallback = 1;
+			break;
+		default:
+			break;
+		}
+		break;
+	case CAM_REQ_ABORTED:
+		new_status = DID_ABORT;
+		break;
+	case CAM_BUSY:
+		new_status = DID_BUS_BUSY;
+		break;
+	case CAM_REQ_INVALID:
+	case CAM_PATH_INVALID:
+		new_status = DID_BAD_TARGET;
+		break;
+	case CAM_SEL_TIMEOUT:
+		new_status = DID_NO_CONNECT;
+		break;
+	case CAM_SCSI_BUS_RESET:
+	case CAM_BDR_SENT:
+		new_status = DID_RESET;
+		break;
+	case CAM_UNCOR_PARITY:
+		new_status = DID_PARITY;
+		do_fallback = 1;
+		break;
+	case CAM_CMD_TIMEOUT:
+		new_status = DID_TIME_OUT;
+		do_fallback = 1;
+		break;
+	case CAM_REQ_CMP_ERR:
+	case CAM_UNEXP_BUSFREE:
+	case CAM_DATA_RUN_ERR:
+		new_status = DID_ERROR;
+		do_fallback = 1;
+		break;
+	case CAM_UA_ABORT:
+	case CAM_NO_HBA:
+	case CAM_SEQUENCE_FAIL:
+	case CAM_CCB_LEN_ERR:
+	case CAM_PROVIDE_FAIL:
+	case CAM_REQ_TERMIO:
+	case CAM_UNREC_HBA_ERROR:
+	case CAM_REQ_TOO_BIG:
+		new_status = DID_ERROR;
+		break;
+	case CAM_REQUEUE_REQ:
+		new_status = DID_REQUEUE;
+		break;
+	default:
+		/* We should never get here */
+		new_status = DID_ERROR;
+		break;
+	}
+
+	if (do_fallback) {
+		printk("%s: device overrun (status %x) on %d:%d:%d\n",
+		       ahd_name(ahd), status, cmd->device->channel,
+		       cmd->device->id, (u8)cmd->device->lun);
+	}
+
+	ahd_cmd_set_transaction_status(cmd, new_status);
+
+	scsi_done(cmd);
+}
+
+static void
+ahd_freeze_simq(struct ahd_softc *ahd)
+{
+	scsi_block_requests(ahd->platform_data->host);
+}
+
+static void
+ahd_release_simq(struct ahd_softc *ahd)
+{
+	scsi_unblock_requests(ahd->platform_data->host);
+}
+
+static int
+ahd_linux_queue_abort_cmd(struct scsi_cmnd *cmd)
+{
+	struct ahd_softc *ahd;
+	struct ahd_linux_device *dev;
+	struct scb *pending_scb;
+	u_int  saved_scbptr;
+	u_int  active_scbptr;
+	u_int  last_phase;
+	u_int  cdb_byte;
+	int    retval = SUCCESS;
+	int    was_paused;
+	int    paused;
+	int    wait;
+	int    disconnected;
+	ahd_mode_state saved_modes;
+	unsigned long flags;
+
+	pending_scb = NULL;
+	paused = FALSE;
+	wait = FALSE;
+	ahd = *(struct ahd_softc **)cmd->device->host->hostdata;
+
+	scmd_printk(KERN_INFO, cmd,
+		    "Attempting to queue an ABORT message:");
+
+	printk("CDB:");
+	for (cdb_byte = 0; cdb_byte < cmd->cmd_len; cdb_byte++)
+		printk(" 0x%x", cmd->cmnd[cdb_byte]);
+	printk("\n");
+
+	ahd_lock(ahd, &flags);
+
+	/*
+	 * First determine if we currently own this command.
+	 * Start by searching the device queue.  If not found
+	 * there, check the pending_scb list.  If not found
+	 * at all, and the system wanted us to just abort the
+	 * command, return success.
+	 */
+	dev = scsi_transport_device_data(cmd->device);
+
+	if (dev == NULL) {
+		/*
+		 * No target device for this command exists,
+		 * so we must not still own the command.
+		 */
+		scmd_printk(KERN_INFO, cmd, "Is not an active device\n");
+		goto done;
+	}
+
+	/*
+	 * See if we can find a matching cmd in the pending list.
+	 */
+	LIST_FOREACH(pending_scb, &ahd->pending_scbs, pending_links) {
+		if (pending_scb->io_ctx == cmd)
+			break;
+	}
+
+	if (pending_scb == NULL) {
+		scmd_printk(KERN_INFO, cmd, "Command not found\n");
+		goto done;
+	}
+
+	if ((pending_scb->flags & SCB_RECOVERY_SCB) != 0) {
+		/*
+		 * We can't queue two recovery actions using the same SCB
+		 */
+		retval = FAILED;
+		goto done;
+	}
+
+	/*
+	 * Ensure that the card doesn't do anything
+	 * behind our back.  Also make sure that we
+	 * didn't "just" miss an interrupt that would
+	 * affect this cmd.
+	 */
+	was_paused = ahd_is_paused(ahd);
+	ahd_pause_and_flushwork(ahd);
+	paused = TRUE;
+
+	if ((pending_scb->flags & SCB_ACTIVE) == 0) {
+		scmd_printk(KERN_INFO, cmd, "Command already completed\n");
+		goto done;
+	}
+
+	printk("%s: At time of recovery, card was %spaused\n",
+	       ahd_name(ahd), was_paused ? "" : "not ");
+	ahd_dump_card_state(ahd);
+
+	disconnected = TRUE;
+	if (ahd_search_qinfifo(ahd, cmd->device->id, 
+			       cmd->device->channel + 'A',
+			       cmd->device->lun,
+			       pending_scb->hscb->tag,
+			       ROLE_INITIATOR, CAM_REQ_ABORTED,
+			       SEARCH_COMPLETE) > 0) {
+		printk("%s:%d:%d:%d: Cmd aborted from QINFIFO\n",
+		       ahd_name(ahd), cmd->device->channel, 
+		       cmd->device->id, (u8)cmd->device->lun);
+		goto done;
+	}
+
+	saved_modes = ahd_save_modes(ahd);
+	ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
+	last_phase = ahd_inb(ahd, LASTPHASE);
+	saved_scbptr = ahd_get_scbptr(ahd);
+	active_scbptr = saved_scbptr;
+	if (disconnected && (ahd_inb(ahd, SEQ_FLAGS) & NOT_IDENTIFIED) == 0) {
+		struct scb *bus_scb;
+
+		bus_scb = ahd_lookup_scb(ahd, active_scbptr);
+		if (bus_scb == pending_scb)
+			disconnected = FALSE;
+	}
+
+	/*
+	 * At this point, pending_scb is the scb associated with the
+	 * passed in command.  That command is currently active on the
+	 * bus or is in the disconnected state.
+	 */
+	ahd_inb(ahd, SAVED_SCSIID);
+	if (last_phase != P_BUSFREE
+	    && SCB_GET_TAG(pending_scb) == active_scbptr) {
+
+		/*
+		 * We're active on the bus, so assert ATN
+		 * and hope that the target responds.
+		 */
+		pending_scb = ahd_lookup_scb(ahd, active_scbptr);
+		pending_scb->flags |= SCB_RECOVERY_SCB|SCB_ABORT;
+		ahd_outb(ahd, MSG_OUT, HOST_MSG);
+		ahd_outb(ahd, SCSISIGO, last_phase|ATNO);
+		scmd_printk(KERN_INFO, cmd, "Device is active, asserting ATN\n");
+		wait = TRUE;
+	} else if (disconnected) {
+
+		/*
+		 * Actually re-queue this SCB in an attempt
+		 * to select the device before it reconnects.
+		 */
+		pending_scb->flags |= SCB_RECOVERY_SCB|SCB_ABORT;
+		ahd_set_scbptr(ahd, SCB_GET_TAG(pending_scb));
+		pending_scb->hscb->cdb_len = 0;
+		pending_scb->hscb->task_attribute = 0;
+		pending_scb->hscb->task_management = SIU_TASKMGMT_ABORT_TASK;
+
+		if ((pending_scb->flags & SCB_PACKETIZED) != 0) {
+			/*
+			 * Mark the SCB has having an outstanding
+			 * task management function.  Should the command
+			 * complete normally before the task management
+			 * function can be sent, the host will be notified
+			 * to abort our requeued SCB.
+			 */
+			ahd_outb(ahd, SCB_TASK_MANAGEMENT,
+				 pending_scb->hscb->task_management);
+		} else {
+			/*
+			 * If non-packetized, set the MK_MESSAGE control
+			 * bit indicating that we desire to send a message.
+			 * We also set the disconnected flag since there is
+			 * no guarantee that our SCB control byte matches
+			 * the version on the card.  We don't want the
+			 * sequencer to abort the command thinking an
+			 * unsolicited reselection occurred.
+			 */
+			pending_scb->hscb->control |= MK_MESSAGE|DISCONNECTED;
+
+			/*
+			 * The sequencer will never re-reference the
+			 * in-core SCB.  To make sure we are notified
+			 * during reselection, set the MK_MESSAGE flag in
+			 * the card's copy of the SCB.
+			 */
+			ahd_outb(ahd, SCB_CONTROL,
+				 ahd_inb(ahd, SCB_CONTROL)|MK_MESSAGE);
+		}
+
+		/*
+		 * Clear out any entries in the QINFIFO first
+		 * so we are the next SCB for this target
+		 * to run.
+		 */
+		ahd_search_qinfifo(ahd, cmd->device->id,
+				   cmd->device->channel + 'A', cmd->device->lun,
+				   SCB_LIST_NULL, ROLE_INITIATOR,
+				   CAM_REQUEUE_REQ, SEARCH_COMPLETE);
+		ahd_qinfifo_requeue_tail(ahd, pending_scb);
+		ahd_set_scbptr(ahd, saved_scbptr);
+		ahd_print_path(ahd, pending_scb);
+		printk("Device is disconnected, re-queuing SCB\n");
+		wait = TRUE;
+	} else {
+		scmd_printk(KERN_INFO, cmd, "Unable to deliver message\n");
+		retval = FAILED;
+	}
+
+
+	ahd_restore_modes(ahd, saved_modes);
+done:
+	if (paused)
+		ahd_unpause(ahd);
+	if (wait) {
+		DECLARE_COMPLETION_ONSTACK(done);
+
+		ahd->platform_data->eh_done = &done;
+		ahd_unlock(ahd, &flags);
+
+		printk("%s: Recovery code sleeping\n", ahd_name(ahd));
+		if (!wait_for_completion_timeout(&done, 5 * HZ)) {
+			ahd_lock(ahd, &flags);
+			ahd->platform_data->eh_done = NULL;
+			ahd_unlock(ahd, &flags);
+			printk("%s: Timer Expired (active %d)\n",
+			       ahd_name(ahd), dev->active);
+			retval = FAILED;
+		}
+		printk("Recovery code awake\n");
+	} else
+		ahd_unlock(ahd, &flags);
+
+	if (retval != SUCCESS)
+		printk("%s: Command abort returning 0x%x\n",
+		       ahd_name(ahd), retval);
+
+	return retval;
+}
+
+static void ahd_linux_set_width(struct scsi_target *starget, int width)
+{
+	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
+	struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
+	struct ahd_devinfo devinfo;
+	unsigned long flags;
+
+	ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
+			    starget->channel + 'A', ROLE_INITIATOR);
+	ahd_lock(ahd, &flags);
+	ahd_set_width(ahd, &devinfo, width, AHD_TRANS_GOAL, FALSE);
+	ahd_unlock(ahd, &flags);
+}
+
+static void ahd_linux_set_period(struct scsi_target *starget, int period)
+{
+	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
+	struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
+	struct ahd_tmode_tstate *tstate;
+	struct ahd_initiator_tinfo *tinfo 
+		= ahd_fetch_transinfo(ahd,
+				      starget->channel + 'A',
+				      shost->this_id, starget->id, &tstate);
+	struct ahd_devinfo devinfo;
+	unsigned int ppr_options = tinfo->goal.ppr_options;
+	unsigned int dt;
+	unsigned long flags;
+	unsigned long offset = tinfo->goal.offset;
+
+#ifdef AHD_DEBUG
+	if ((ahd_debug & AHD_SHOW_DV) != 0)
+		printk("%s: set period to %d\n", ahd_name(ahd), period);
+#endif
+	if (offset == 0)
+		offset = MAX_OFFSET;
+
+	if (period < 8)
+		period = 8;
+	if (period < 10) {
+		if (spi_max_width(starget)) {
+			ppr_options |= MSG_EXT_PPR_DT_REQ;
+			if (period == 8)
+				ppr_options |= MSG_EXT_PPR_IU_REQ;
+		} else
+			period = 10;
+	}
+
+	dt = ppr_options & MSG_EXT_PPR_DT_REQ;
+
+	ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
+			    starget->channel + 'A', ROLE_INITIATOR);
+
+	/* all PPR requests apart from QAS require wide transfers */
+	if (ppr_options & ~MSG_EXT_PPR_QAS_REQ) {
+		if (spi_width(starget) == 0)
+			ppr_options &= MSG_EXT_PPR_QAS_REQ;
+	}
+
+	ahd_find_syncrate(ahd, &period, &ppr_options,
+			  dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
+
+	ahd_lock(ahd, &flags);
+	ahd_set_syncrate(ahd, &devinfo, period, offset,
+			 ppr_options, AHD_TRANS_GOAL, FALSE);
+	ahd_unlock(ahd, &flags);
+}
+
+static void ahd_linux_set_offset(struct scsi_target *starget, int offset)
+{
+	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
+	struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
+	struct ahd_tmode_tstate *tstate;
+	struct ahd_initiator_tinfo *tinfo 
+		= ahd_fetch_transinfo(ahd,
+				      starget->channel + 'A',
+				      shost->this_id, starget->id, &tstate);
+	struct ahd_devinfo devinfo;
+	unsigned int ppr_options = 0;
+	unsigned int period = 0;
+	unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
+	unsigned long flags;
+
+#ifdef AHD_DEBUG
+	if ((ahd_debug & AHD_SHOW_DV) != 0)
+		printk("%s: set offset to %d\n", ahd_name(ahd), offset);
+#endif
+
+	ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
+			    starget->channel + 'A', ROLE_INITIATOR);
+	if (offset != 0) {
+		period = tinfo->goal.period;
+		ppr_options = tinfo->goal.ppr_options;
+		ahd_find_syncrate(ahd, &period, &ppr_options, 
+				  dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
+	}
+
+	ahd_lock(ahd, &flags);
+	ahd_set_syncrate(ahd, &devinfo, period, offset, ppr_options,
+			 AHD_TRANS_GOAL, FALSE);
+	ahd_unlock(ahd, &flags);
+}
+
+static void ahd_linux_set_dt(struct scsi_target *starget, int dt)
+{
+	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
+	struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
+	struct ahd_tmode_tstate *tstate;
+	struct ahd_initiator_tinfo *tinfo 
+		= ahd_fetch_transinfo(ahd,
+				      starget->channel + 'A',
+				      shost->this_id, starget->id, &tstate);
+	struct ahd_devinfo devinfo;
+	unsigned int ppr_options = tinfo->goal.ppr_options
+		& ~MSG_EXT_PPR_DT_REQ;
+	unsigned int period = tinfo->goal.period;
+	unsigned int width = tinfo->goal.width;
+	unsigned long flags;
+
+#ifdef AHD_DEBUG
+	if ((ahd_debug & AHD_SHOW_DV) != 0)
+		printk("%s: %s DT\n", ahd_name(ahd),
+		       dt ? "enabling" : "disabling");
+#endif
+	if (dt && spi_max_width(starget)) {
+		ppr_options |= MSG_EXT_PPR_DT_REQ;
+		if (!width)
+			ahd_linux_set_width(starget, 1);
+	} else {
+		if (period <= 9)
+			period = 10; /* If resetting DT, period must be >= 25ns */
+		/* IU is invalid without DT set */
+		ppr_options &= ~MSG_EXT_PPR_IU_REQ;
+	}
+	ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
+			    starget->channel + 'A', ROLE_INITIATOR);
+	ahd_find_syncrate(ahd, &period, &ppr_options,
+			  dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
+
+	ahd_lock(ahd, &flags);
+	ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
+			 ppr_options, AHD_TRANS_GOAL, FALSE);
+	ahd_unlock(ahd, &flags);
+}
+
+static void ahd_linux_set_qas(struct scsi_target *starget, int qas)
+{
+	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
+	struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
+	struct ahd_tmode_tstate *tstate;
+	struct ahd_initiator_tinfo *tinfo 
+		= ahd_fetch_transinfo(ahd,
+				      starget->channel + 'A',
+				      shost->this_id, starget->id, &tstate);
+	struct ahd_devinfo devinfo;
+	unsigned int ppr_options = tinfo->goal.ppr_options
+		& ~MSG_EXT_PPR_QAS_REQ;
+	unsigned int period = tinfo->goal.period;
+	unsigned int dt;
+	unsigned long flags;
+
+#ifdef AHD_DEBUG
+	if ((ahd_debug & AHD_SHOW_DV) != 0)
+		printk("%s: %s QAS\n", ahd_name(ahd),
+		       qas ? "enabling" : "disabling");
+#endif
+
+	if (qas) {
+		ppr_options |= MSG_EXT_PPR_QAS_REQ; 
+	}
+
+	dt = ppr_options & MSG_EXT_PPR_DT_REQ;
+
+	ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
+			    starget->channel + 'A', ROLE_INITIATOR);
+	ahd_find_syncrate(ahd, &period, &ppr_options,
+			  dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
+
+	ahd_lock(ahd, &flags);
+	ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
+			 ppr_options, AHD_TRANS_GOAL, FALSE);
+	ahd_unlock(ahd, &flags);
+}
+
+static void ahd_linux_set_iu(struct scsi_target *starget, int iu)
+{
+	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
+	struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
+	struct ahd_tmode_tstate *tstate;
+	struct ahd_initiator_tinfo *tinfo 
+		= ahd_fetch_transinfo(ahd,
+				      starget->channel + 'A',
+				      shost->this_id, starget->id, &tstate);
+	struct ahd_devinfo devinfo;
+	unsigned int ppr_options = tinfo->goal.ppr_options
+		& ~MSG_EXT_PPR_IU_REQ;
+	unsigned int period = tinfo->goal.period;
+	unsigned int dt;
+	unsigned long flags;
+
+#ifdef AHD_DEBUG
+	if ((ahd_debug & AHD_SHOW_DV) != 0)
+		printk("%s: %s IU\n", ahd_name(ahd),
+		       iu ? "enabling" : "disabling");
+#endif
+
+	if (iu && spi_max_width(starget)) {
+		ppr_options |= MSG_EXT_PPR_IU_REQ;
+		ppr_options |= MSG_EXT_PPR_DT_REQ; /* IU requires DT */
+	}
+
+	dt = ppr_options & MSG_EXT_PPR_DT_REQ;
+
+	ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
+			    starget->channel + 'A', ROLE_INITIATOR);
+	ahd_find_syncrate(ahd, &period, &ppr_options,
+			  dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
+
+	ahd_lock(ahd, &flags);
+	ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
+			 ppr_options, AHD_TRANS_GOAL, FALSE);
+	ahd_unlock(ahd, &flags);
+}
+
+static void ahd_linux_set_rd_strm(struct scsi_target *starget, int rdstrm)
+{
+	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
+	struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
+	struct ahd_tmode_tstate *tstate;
+	struct ahd_initiator_tinfo *tinfo 
+		= ahd_fetch_transinfo(ahd,
+				      starget->channel + 'A',
+				      shost->this_id, starget->id, &tstate);
+	struct ahd_devinfo devinfo;
+	unsigned int ppr_options = tinfo->goal.ppr_options
+		& ~MSG_EXT_PPR_RD_STRM;
+	unsigned int period = tinfo->goal.period;
+	unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
+	unsigned long flags;
+
+#ifdef AHD_DEBUG
+	if ((ahd_debug & AHD_SHOW_DV) != 0)
+		printk("%s: %s Read Streaming\n", ahd_name(ahd),
+		       rdstrm  ? "enabling" : "disabling");
+#endif
+
+	if (rdstrm && spi_max_width(starget))
+		ppr_options |= MSG_EXT_PPR_RD_STRM;
+
+	ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
+			    starget->channel + 'A', ROLE_INITIATOR);
+	ahd_find_syncrate(ahd, &period, &ppr_options,
+			  dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
+
+	ahd_lock(ahd, &flags);
+	ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
+			 ppr_options, AHD_TRANS_GOAL, FALSE);
+	ahd_unlock(ahd, &flags);
+}
+
+static void ahd_linux_set_wr_flow(struct scsi_target *starget, int wrflow)
+{
+	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
+	struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
+	struct ahd_tmode_tstate *tstate;
+	struct ahd_initiator_tinfo *tinfo 
+		= ahd_fetch_transinfo(ahd,
+				      starget->channel + 'A',
+				      shost->this_id, starget->id, &tstate);
+	struct ahd_devinfo devinfo;
+	unsigned int ppr_options = tinfo->goal.ppr_options
+		& ~MSG_EXT_PPR_WR_FLOW;
+	unsigned int period = tinfo->goal.period;
+	unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
+	unsigned long flags;
+
+#ifdef AHD_DEBUG
+	if ((ahd_debug & AHD_SHOW_DV) != 0)
+		printk("%s: %s Write Flow Control\n", ahd_name(ahd),
+		       wrflow ? "enabling" : "disabling");
+#endif
+
+	if (wrflow && spi_max_width(starget))
+		ppr_options |= MSG_EXT_PPR_WR_FLOW;
+
+	ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
+			    starget->channel + 'A', ROLE_INITIATOR);
+	ahd_find_syncrate(ahd, &period, &ppr_options,
+			  dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
+
+	ahd_lock(ahd, &flags);
+	ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
+			 ppr_options, AHD_TRANS_GOAL, FALSE);
+	ahd_unlock(ahd, &flags);
+}
+
+static void ahd_linux_set_rti(struct scsi_target *starget, int rti)
+{
+	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
+	struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
+	struct ahd_tmode_tstate *tstate;
+	struct ahd_initiator_tinfo *tinfo 
+		= ahd_fetch_transinfo(ahd,
+				      starget->channel + 'A',
+				      shost->this_id, starget->id, &tstate);
+	struct ahd_devinfo devinfo;
+	unsigned int ppr_options = tinfo->goal.ppr_options
+		& ~MSG_EXT_PPR_RTI;
+	unsigned int period = tinfo->goal.period;
+	unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
+	unsigned long flags;
+
+	if ((ahd->features & AHD_RTI) == 0) {
+#ifdef AHD_DEBUG
+		if ((ahd_debug & AHD_SHOW_DV) != 0)
+			printk("%s: RTI not available\n", ahd_name(ahd));
+#endif
+		return;
+	}
+
+#ifdef AHD_DEBUG
+	if ((ahd_debug & AHD_SHOW_DV) != 0)
+		printk("%s: %s RTI\n", ahd_name(ahd),
+		       rti ? "enabling" : "disabling");
+#endif
+
+	if (rti && spi_max_width(starget))
+		ppr_options |= MSG_EXT_PPR_RTI;
+
+	ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
+			    starget->channel + 'A', ROLE_INITIATOR);
+	ahd_find_syncrate(ahd, &period, &ppr_options,
+			  dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
+
+	ahd_lock(ahd, &flags);
+	ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
+			 ppr_options, AHD_TRANS_GOAL, FALSE);
+	ahd_unlock(ahd, &flags);
+}
+
+static void ahd_linux_set_pcomp_en(struct scsi_target *starget, int pcomp)
+{
+	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
+	struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
+	struct ahd_tmode_tstate *tstate;
+	struct ahd_initiator_tinfo *tinfo 
+		= ahd_fetch_transinfo(ahd,
+				      starget->channel + 'A',
+				      shost->this_id, starget->id, &tstate);
+	struct ahd_devinfo devinfo;
+	unsigned int ppr_options = tinfo->goal.ppr_options
+		& ~MSG_EXT_PPR_PCOMP_EN;
+	unsigned int period = tinfo->goal.period;
+	unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
+	unsigned long flags;
+
+#ifdef AHD_DEBUG
+	if ((ahd_debug & AHD_SHOW_DV) != 0)
+		printk("%s: %s Precompensation\n", ahd_name(ahd),
+		       pcomp ? "Enable" : "Disable");
+#endif
+
+	if (pcomp && spi_max_width(starget)) {
+		uint8_t precomp;
+
+		if (ahd->unit < ARRAY_SIZE(aic79xx_iocell_info)) {
+			const struct ahd_linux_iocell_opts *iocell_opts;
+
+			iocell_opts = &aic79xx_iocell_info[ahd->unit];
+			precomp = iocell_opts->precomp;
+		} else {
+			precomp = AIC79XX_DEFAULT_PRECOMP;
+		}
+		ppr_options |= MSG_EXT_PPR_PCOMP_EN;
+		AHD_SET_PRECOMP(ahd, precomp);
+	} else {
+		AHD_SET_PRECOMP(ahd, 0);
+	}
+
+	ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
+			    starget->channel + 'A', ROLE_INITIATOR);
+	ahd_find_syncrate(ahd, &period, &ppr_options,
+			  dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
+
+	ahd_lock(ahd, &flags);
+	ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
+			 ppr_options, AHD_TRANS_GOAL, FALSE);
+	ahd_unlock(ahd, &flags);
+}
+
+static void ahd_linux_set_hold_mcs(struct scsi_target *starget, int hold)
+{
+	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
+	struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
+	struct ahd_tmode_tstate *tstate;
+	struct ahd_initiator_tinfo *tinfo 
+		= ahd_fetch_transinfo(ahd,
+				      starget->channel + 'A',
+				      shost->this_id, starget->id, &tstate);
+	struct ahd_devinfo devinfo;
+	unsigned int ppr_options = tinfo->goal.ppr_options
+		& ~MSG_EXT_PPR_HOLD_MCS;
+	unsigned int period = tinfo->goal.period;
+	unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
+	unsigned long flags;
+
+	if (hold && spi_max_width(starget))
+		ppr_options |= MSG_EXT_PPR_HOLD_MCS;
+
+	ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
+			    starget->channel + 'A', ROLE_INITIATOR);
+	ahd_find_syncrate(ahd, &period, &ppr_options,
+			  dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
+
+	ahd_lock(ahd, &flags);
+	ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
+			 ppr_options, AHD_TRANS_GOAL, FALSE);
+	ahd_unlock(ahd, &flags);
+}
+
+static void ahd_linux_get_signalling(struct Scsi_Host *shost)
+{
+	struct ahd_softc *ahd = *(struct ahd_softc **)shost->hostdata;
+	unsigned long flags;
+	u8 mode;
+
+	ahd_lock(ahd, &flags);
+	ahd_pause(ahd);
+	mode = ahd_inb(ahd, SBLKCTL);
+	ahd_unpause(ahd);
+	ahd_unlock(ahd, &flags);
+
+	if (mode & ENAB40)
+		spi_signalling(shost) = SPI_SIGNAL_LVD;
+	else if (mode & ENAB20)
+		spi_signalling(shost) = SPI_SIGNAL_SE;
+	else
+		spi_signalling(shost) = SPI_SIGNAL_UNKNOWN;
+}
+
+static struct spi_function_template ahd_linux_transport_functions = {
+	.set_offset	= ahd_linux_set_offset,
+	.show_offset	= 1,
+	.set_period	= ahd_linux_set_period,
+	.show_period	= 1,
+	.set_width	= ahd_linux_set_width,
+	.show_width	= 1,
+	.set_dt		= ahd_linux_set_dt,
+	.show_dt	= 1,
+	.set_iu		= ahd_linux_set_iu,
+	.show_iu	= 1,
+	.set_qas	= ahd_linux_set_qas,
+	.show_qas	= 1,
+	.set_rd_strm	= ahd_linux_set_rd_strm,
+	.show_rd_strm	= 1,
+	.set_wr_flow	= ahd_linux_set_wr_flow,
+	.show_wr_flow	= 1,
+	.set_rti	= ahd_linux_set_rti,
+	.show_rti	= 1,
+	.set_pcomp_en	= ahd_linux_set_pcomp_en,
+	.show_pcomp_en	= 1,
+	.set_hold_mcs	= ahd_linux_set_hold_mcs,
+	.show_hold_mcs	= 1,
+	.get_signalling = ahd_linux_get_signalling,
+};
+
+static int __init
+ahd_linux_init(void)
+{
+	int	error = 0;
+
+	/*
+	 * If we've been passed any parameters, process them now.
+	 */
+	if (aic79xx)
+		aic79xx_setup(aic79xx);
+
+	ahd_linux_transport_template =
+		spi_attach_transport(&ahd_linux_transport_functions);
+	if (!ahd_linux_transport_template)
+		return -ENODEV;
+
+	scsi_transport_reserve_device(ahd_linux_transport_template,
+				      sizeof(struct ahd_linux_device));
+
+	error = ahd_linux_pci_init();
+	if (error)
+		spi_release_transport(ahd_linux_transport_template);
+	return error;
+}
+
+static void __exit
+ahd_linux_exit(void)
+{
+	ahd_linux_pci_exit();
+	spi_release_transport(ahd_linux_transport_template);
+}
+
+module_init(ahd_linux_init);
+module_exit(ahd_linux_exit);