Add the rt linux 4.1.3-rt3 as base

Import the rt linux 4.1.3-rt3 as OPNFV kvm base.

It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:

commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date:   Sat Jul 25 12:13:34 2015 +0200

    Prepare v4.1.3-rt3

    Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.

Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>

1 files changed, 2598 insertions, 0 deletions

diff --git a/kernel/drivers/scsi/aic7xxx/aic7xxx_osm.c b/kernel/drivers/scsi/aic7xxx/aic7xxx_osm.c
new file mode 100644
index 000000000..a2f2c774c
--- /dev/null
+++ b/kernel/drivers/scsi/aic7xxx/aic7xxx_osm.c
@@ -0,0 +1,2598 @@
+/*
+ * Adaptec AIC7xxx device driver for Linux.
+ *
+ * $Id: //depot/aic7xxx/linux/drivers/scsi/aic7xxx/aic7xxx_osm.c#235 $
+ *
+ * Copyright (c) 1994 John Aycock
+ *   The University of Calgary Department of Computer Science.
+ *
+ * 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, 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; see the file COPYING.  If not, write to
+ * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * Sources include the Adaptec 1740 driver (aha1740.c), the Ultrastor 24F
+ * driver (ultrastor.c), various Linux kernel source, the Adaptec EISA
+ * config file (!adp7771.cfg), the Adaptec AHA-2740A Series User's Guide,
+ * the Linux Kernel Hacker's Guide, Writing a SCSI Device Driver for Linux,
+ * the Adaptec 1542 driver (aha1542.c), the Adaptec EISA overlay file
+ * (adp7770.ovl), the Adaptec AHA-2740 Series Technical Reference Manual,
+ * the Adaptec AIC-7770 Data Book, the ANSI SCSI specification, the
+ * ANSI SCSI-2 specification (draft 10c), ...
+ *
+ * --------------------------------------------------------------------------
+ *
+ *  Modifications by Daniel M. Eischen (deischen@iworks.InterWorks.org):
+ *
+ *  Substantially modified to include support for wide and twin bus
+ *  adapters, DMAing of SCBs, tagged queueing, IRQ sharing, bug fixes,
+ *  SCB paging, and other rework of the code.
+ *
+ * --------------------------------------------------------------------------
+ * Copyright (c) 1994-2000 Justin T. Gibbs.
+ * Copyright (c) 2000-2001 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.
+ *
+ *---------------------------------------------------------------------------
+ *
+ *  Thanks also go to (in alphabetical order) the following:
+ *
+ *    Rory Bolt     - Sequencer bug fixes
+ *    Jay Estabrook - Initial DEC Alpha support
+ *    Doug Ledford  - Much needed abort/reset bug fixes
+ *    Kai Makisara  - DMAing of SCBs
+ *
+ *  A Boot time option was also added for not resetting the scsi bus.
+ *
+ *    Form:  aic7xxx=extended
+ *           aic7xxx=no_reset
+ *           aic7xxx=verbose
+ *
+ *  Daniel M. Eischen, deischen@iworks.InterWorks.org, 1/23/97
+ *
+ *  Id: aic7xxx.c,v 4.1 1997/06/12 08:23:42 deang Exp
+ */
+
+/*
+ * Further driver modifications made by Doug Ledford <dledford@redhat.com>
+ *
+ * Copyright (c) 1997-1999 Doug Ledford
+ *
+ * These changes are released under the same licensing terms as the FreeBSD
+ * driver written by Justin Gibbs.  Please see his Copyright notice above
+ * for the exact terms and conditions covering my changes as well as the
+ * warranty statement.
+ *
+ * Modifications made to the aic7xxx.c,v 4.1 driver from Dan Eischen include
+ * but are not limited to:
+ *
+ *  1: Import of the latest FreeBSD sequencer code for this driver
+ *  2: Modification of kernel code to accommodate different sequencer semantics
+ *  3: Extensive changes throughout kernel portion of driver to improve
+ *     abort/reset processing and error hanndling
+ *  4: Other work contributed by various people on the Internet
+ *  5: Changes to printk information and verbosity selection code
+ *  6: General reliability related changes, especially in IRQ management
+ *  7: Modifications to the default probe/attach order for supported cards
+ *  8: SMP friendliness has been improved
+ *
+ */
+
+#include "aic7xxx_osm.h"
+#include "aic7xxx_inline.h"
+#include <scsi/scsicam.h>
+
+static struct scsi_transport_template *ahc_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/slab.h>
+
+
+/*
+ * 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_AIC7XXX_RESET_DELAY_MS
+#define AIC7XXX_RESET_DELAY CONFIG_AIC7XXX_RESET_DELAY_MS
+#else
+#define AIC7XXX_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="aic7xxx=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 {
+	uint8_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 aic7xxx 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 aic7xxx_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_AIC7XXX_CMDS_PER_DEVICE
+#define AIC7XXX_CMDS_PER_DEVICE CONFIG_AIC7XXX_CMDS_PER_DEVICE
+#else
+#define AIC7XXX_CMDS_PER_DEVICE AHC_MAX_QUEUE
+#endif
+
+#define AIC7XXX_CONFIGED_TAG_COMMANDS {					\
+	AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,		\
+	AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,		\
+	AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,		\
+	AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,		\
+	AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,		\
+	AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,		\
+	AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,		\
+	AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE		\
+}
+
+/*
+ * By default, use the number of commands specified by
+ * the users kernel configuration.
+ */
+static adapter_tag_info_t aic7xxx_tag_info[] =
+{
+	{AIC7XXX_CONFIGED_TAG_COMMANDS},
+	{AIC7XXX_CONFIGED_TAG_COMMANDS},
+	{AIC7XXX_CONFIGED_TAG_COMMANDS},
+	{AIC7XXX_CONFIGED_TAG_COMMANDS},
+	{AIC7XXX_CONFIGED_TAG_COMMANDS},
+	{AIC7XXX_CONFIGED_TAG_COMMANDS},
+	{AIC7XXX_CONFIGED_TAG_COMMANDS},
+	{AIC7XXX_CONFIGED_TAG_COMMANDS},
+	{AIC7XXX_CONFIGED_TAG_COMMANDS},
+	{AIC7XXX_CONFIGED_TAG_COMMANDS},
+	{AIC7XXX_CONFIGED_TAG_COMMANDS},
+	{AIC7XXX_CONFIGED_TAG_COMMANDS},
+	{AIC7XXX_CONFIGED_TAG_COMMANDS},
+	{AIC7XXX_CONFIGED_TAG_COMMANDS},
+	{AIC7XXX_CONFIGED_TAG_COMMANDS},
+	{AIC7XXX_CONFIGED_TAG_COMMANDS}
+};
+
+/*
+ * 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
+ahc_print_path(struct ahc_softc *ahc, struct scb *scb)
+{
+	printk("(scsi%d:%c:%d:%d): ",
+	       ahc->platform_data->host->host_no,
+	       scb != NULL ? SCB_GET_CHANNEL(ahc, scb) : 'X',
+	       scb != NULL ? SCB_GET_TARGET(ahc, scb) : -1,
+	       scb != NULL ? SCB_GET_LUN(scb) : -1);
+}
+
+/*
+ * XXX - these options apply unilaterally to _all_ 274x/284x/294x
+ *       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 aic7xxx_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 aic7xxx_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 where stray PCI transactions with bad parity are
+ * the norm rather than the exception, the error messages can be overwhelming.
+ * It's included in the driver for completeness.
+ *   0	   = Shut off PCI parity check
+ *   non-0 = reverse polarity pci parity checking
+ */
+static uint32_t aic7xxx_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 aic7xxx_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 aic7xxx_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 aic7xxx_periodic_otag;
+
+/*
+ * Module information and settable options.
+ */
+static char *aic7xxx = NULL;
+
+MODULE_AUTHOR("Maintainer: Hannes Reinecke <hare@suse.de>");
+MODULE_DESCRIPTION("Adaptec AIC77XX/78XX SCSI Host Bus Adapter driver");
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_VERSION(AIC7XXX_DRIVER_VERSION);
+module_param(aic7xxx, charp, 0444);
+MODULE_PARM_DESC(aic7xxx,
+"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_probe		Toggle EISA/VLB controller probing\n"
+"	probe_eisa_vl		Toggle EISA/VLB controller probing\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"
+"				drives or RAID arrays.\n"
+"	tag_info:<tag_str>	Set per-target tag depth\n"
+"	global_tag_depth:<int>	Global tag depth for every target\n"
+"				on every bus\n"
+"	seltime:<int>		Selection Timeout\n"
+"				(0/256ms,1/128ms,2/64ms,3/32ms)\n"
+"\n"
+"	Sample modprobe configuration file:\n"
+"	#	Toggle EISA/VLB probing\n"
+"	#	Set tag depth on Controller 1/Target 1 to 10 tags\n"
+"	#	Shorten the selection timeout to 128ms\n"
+"\n"
+"	options aic7xxx 'aic7xxx=probe_eisa_vl.tag_info:{{}.{.10}}.seltime:1'\n"
+);
+
+static void ahc_linux_handle_scsi_status(struct ahc_softc *,
+					 struct scsi_device *,
+					 struct scb *);
+static void ahc_linux_queue_cmd_complete(struct ahc_softc *ahc,
+					 struct scsi_cmnd *cmd);
+static void ahc_linux_freeze_simq(struct ahc_softc *ahc);
+static void ahc_linux_release_simq(struct ahc_softc *ahc);
+static int  ahc_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag);
+static void ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc);
+static u_int ahc_linux_user_tagdepth(struct ahc_softc *ahc,
+				     struct ahc_devinfo *devinfo);
+static void ahc_linux_device_queue_depth(struct scsi_device *);
+static int ahc_linux_run_command(struct ahc_softc*,
+				 struct ahc_linux_device *,
+				 struct scsi_cmnd *);
+static void ahc_linux_setup_tag_info_global(char *p);
+static int  aic7xxx_setup(char *s);
+
+static int ahc_linux_unit;
+
+
+/************************** OS Utility Wrappers *******************************/
+void
+ahc_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
+ahc_inb(struct ahc_softc * ahc, long port)
+{
+	uint8_t x;
+
+	if (ahc->tag == BUS_SPACE_MEMIO) {
+		x = readb(ahc->bsh.maddr + port);
+	} else {
+		x = inb(ahc->bsh.ioport + port);
+	}
+	mb();
+	return (x);
+}
+
+void
+ahc_outb(struct ahc_softc * ahc, long port, uint8_t val)
+{
+	if (ahc->tag == BUS_SPACE_MEMIO) {
+		writeb(val, ahc->bsh.maddr + port);
+	} else {
+		outb(val, ahc->bsh.ioport + port);
+	}
+	mb();
+}
+
+void
+ahc_outsb(struct ahc_softc * ahc, 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++)
+		ahc_outb(ahc, port, *array++);
+}
+
+void
+ahc_insb(struct ahc_softc * ahc, 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++ = ahc_inb(ahc, port);
+}
+
+/********************************* Inlines ************************************/
+static void ahc_linux_unmap_scb(struct ahc_softc*, struct scb*);
+
+static int ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb,
+		 		      struct ahc_dma_seg *sg,
+				      dma_addr_t addr, bus_size_t len);
+
+static void
+ahc_linux_unmap_scb(struct ahc_softc *ahc, struct scb *scb)
+{
+	struct scsi_cmnd *cmd;
+
+	cmd = scb->io_ctx;
+	ahc_sync_sglist(ahc, scb, BUS_DMASYNC_POSTWRITE);
+
+	scsi_dma_unmap(cmd);
+}
+
+static int
+ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb,
+		  struct ahc_dma_seg *sg, dma_addr_t addr, bus_size_t len)
+{
+	int	 consumed;
+
+	if ((scb->sg_count + 1) > AHC_NSEG)
+		panic("Too few segs for dma mapping.  "
+		      "Increase AHC_NSEG\n");
+
+	consumed = 1;
+	sg->addr = ahc_htole32(addr & 0xFFFFFFFF);
+	scb->platform_data->xfer_len += len;
+
+	if (sizeof(dma_addr_t) > 4
+	 && (ahc->flags & AHC_39BIT_ADDRESSING) != 0)
+		len |= (addr >> 8) & AHC_SG_HIGH_ADDR_MASK;
+
+	sg->len = ahc_htole32(len);
+	return (consumed);
+}
+
+/*
+ * Return a string describing the driver.
+ */
+static const char *
+ahc_linux_info(struct Scsi_Host *host)
+{
+	static char buffer[512];
+	char	ahc_info[256];
+	char   *bp;
+	struct ahc_softc *ahc;
+
+	bp = &buffer[0];
+	ahc = *(struct ahc_softc **)host->hostdata;
+	memset(bp, 0, sizeof(buffer));
+	strcpy(bp, "Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev " AIC7XXX_DRIVER_VERSION "\n"
+			"        <");
+	strcat(bp, ahc->description);
+	strcat(bp, ">\n"
+			"        ");
+	ahc_controller_info(ahc, ahc_info);
+	strcat(bp, ahc_info);
+	strcat(bp, "\n");
+
+	return (bp);
+}
+
+/*
+ * Queue an SCB to the controller.
+ */
+static int
+ahc_linux_queue_lck(struct scsi_cmnd * cmd, void (*scsi_done) (struct scsi_cmnd *))
+{
+	struct	 ahc_softc *ahc;
+	struct	 ahc_linux_device *dev = scsi_transport_device_data(cmd->device);
+	int rtn = SCSI_MLQUEUE_HOST_BUSY;
+	unsigned long flags;
+
+	ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
+
+	ahc_lock(ahc, &flags);
+	if (ahc->platform_data->qfrozen == 0) {
+		cmd->scsi_done = scsi_done;
+		cmd->result = CAM_REQ_INPROG << 16;
+		rtn = ahc_linux_run_command(ahc, dev, cmd);
+	}
+	ahc_unlock(ahc, &flags);
+
+	return rtn;
+}
+
+static DEF_SCSI_QCMD(ahc_linux_queue)
+
+static inline struct scsi_target **
+ahc_linux_target_in_softc(struct scsi_target *starget)
+{
+	struct	ahc_softc *ahc =
+		*((struct ahc_softc **)dev_to_shost(&starget->dev)->hostdata);
+	unsigned int target_offset;
+
+	target_offset = starget->id;
+	if (starget->channel != 0)
+		target_offset += 8;
+
+	return &ahc->platform_data->starget[target_offset];
+}
+
+static int
+ahc_linux_target_alloc(struct scsi_target *starget)
+{
+	struct	ahc_softc *ahc =
+		*((struct ahc_softc **)dev_to_shost(&starget->dev)->hostdata);
+	struct seeprom_config *sc = ahc->seep_config;
+	unsigned long flags;
+	struct scsi_target **ahc_targp = ahc_linux_target_in_softc(starget);
+	unsigned short scsirate;
+	struct ahc_devinfo devinfo;
+	struct ahc_initiator_tinfo *tinfo;
+	struct ahc_tmode_tstate *tstate;
+	char channel = starget->channel + 'A';
+	unsigned int our_id = ahc->our_id;
+	unsigned int target_offset;
+
+	target_offset = starget->id;
+	if (starget->channel != 0)
+		target_offset += 8;
+	  
+	if (starget->channel)
+		our_id = ahc->our_id_b;
+
+	ahc_lock(ahc, &flags);
+
+	BUG_ON(*ahc_targp != NULL);
+
+	*ahc_targp = starget;
+
+	if (sc) {
+		int maxsync = AHC_SYNCRATE_DT;
+		int ultra = 0;
+		int flags = sc->device_flags[target_offset];
+
+		if (ahc->flags & AHC_NEWEEPROM_FMT) {
+		    if (flags & CFSYNCHISULTRA)
+			ultra = 1;
+		} else if (flags & CFULTRAEN)
+			ultra = 1;
+		/* AIC nutcase; 10MHz appears as ultra = 1, CFXFER = 0x04
+		 * change it to ultra=0, CFXFER = 0 */
+		if(ultra && (flags & CFXFER) == 0x04) {
+			ultra = 0;
+			flags &= ~CFXFER;
+		}
+	    
+		if ((ahc->features & AHC_ULTRA2) != 0) {
+			scsirate = (flags & CFXFER) | (ultra ? 0x8 : 0);
+		} else {
+			scsirate = (flags & CFXFER) << 4;
+			maxsync = ultra ? AHC_SYNCRATE_ULTRA : 
+				AHC_SYNCRATE_FAST;
+		}
+		spi_max_width(starget) = (flags & CFWIDEB) ? 1 : 0;
+		if (!(flags & CFSYNCH))
+			spi_max_offset(starget) = 0;
+		spi_min_period(starget) = 
+			ahc_find_period(ahc, scsirate, maxsync);
+
+		tinfo = ahc_fetch_transinfo(ahc, channel, ahc->our_id,
+					    starget->id, &tstate);
+	}
+	ahc_compile_devinfo(&devinfo, our_id, starget->id,
+			    CAM_LUN_WILDCARD, channel,
+			    ROLE_INITIATOR);
+	ahc_set_syncrate(ahc, &devinfo, NULL, 0, 0, 0,
+			 AHC_TRANS_GOAL, /*paused*/FALSE);
+	ahc_set_width(ahc, &devinfo, MSG_EXT_WDTR_BUS_8_BIT,
+		      AHC_TRANS_GOAL, /*paused*/FALSE);
+	ahc_unlock(ahc, &flags);
+
+	return 0;
+}
+
+static void
+ahc_linux_target_destroy(struct scsi_target *starget)
+{
+	struct scsi_target **ahc_targp = ahc_linux_target_in_softc(starget);
+
+	*ahc_targp = NULL;
+}
+
+static int
+ahc_linux_slave_alloc(struct scsi_device *sdev)
+{
+	struct	ahc_softc *ahc =
+		*((struct ahc_softc **)sdev->host->hostdata);
+	struct scsi_target *starget = sdev->sdev_target;
+	struct ahc_linux_device *dev;
+
+	if (bootverbose)
+		printk("%s: Slave Alloc %d\n", ahc_name(ahc), 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;
+	
+	spi_period(starget) = 0;
+
+	return 0;
+}
+
+static int
+ahc_linux_slave_configure(struct scsi_device *sdev)
+{
+	struct	ahc_softc *ahc;
+
+	ahc = *((struct ahc_softc **)sdev->host->hostdata);
+
+	if (bootverbose)
+		sdev_printk(KERN_INFO, sdev, "Slave Configure\n");
+
+	ahc_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
+ahc_linux_biosparam(struct scsi_device *sdev, struct block_device *bdev,
+		    sector_t capacity, int geom[])
+{
+	uint8_t *bh;
+	int	 heads;
+	int	 sectors;
+	int	 cylinders;
+	int	 ret;
+	int	 extended;
+	struct	 ahc_softc *ahc;
+	u_int	 channel;
+
+	ahc = *((struct ahc_softc **)sdev->host->hostdata);
+	channel = sdev_channel(sdev);
+
+	bh = scsi_bios_ptable(bdev);
+	if (bh) {
+		ret = scsi_partsize(bh, capacity,
+				    &geom[2], &geom[0], &geom[1]);
+		kfree(bh);
+		if (ret != -1)
+			return (ret);
+	}
+	heads = 64;
+	sectors = 32;
+	cylinders = aic_sector_div(capacity, heads, sectors);
+
+	if (aic7xxx_extended != 0)
+		extended = 1;
+	else if (channel == 0)
+		extended = (ahc->flags & AHC_EXTENDED_TRANS_A) != 0;
+	else
+		extended = (ahc->flags & AHC_EXTENDED_TRANS_B) != 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
+ahc_linux_abort(struct scsi_cmnd *cmd)
+{
+	int error;
+
+	error = ahc_linux_queue_recovery_cmd(cmd, SCB_ABORT);
+	if (error != 0)
+		printk("aic7xxx_abort returns 0x%x\n", error);
+	return (error);
+}
+
+/*
+ * Attempt to send a target reset message to the device that timed out.
+ */
+static int
+ahc_linux_dev_reset(struct scsi_cmnd *cmd)
+{
+	int error;
+
+	error = ahc_linux_queue_recovery_cmd(cmd, SCB_DEVICE_RESET);
+	if (error != 0)
+		printk("aic7xxx_dev_reset returns 0x%x\n", error);
+	return (error);
+}
+
+/*
+ * Reset the SCSI bus.
+ */
+static int
+ahc_linux_bus_reset(struct scsi_cmnd *cmd)
+{
+	struct ahc_softc *ahc;
+	int    found;
+	unsigned long flags;
+
+	ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
+
+	ahc_lock(ahc, &flags);
+	found = ahc_reset_channel(ahc, scmd_channel(cmd) + 'A',
+				  /*initiate reset*/TRUE);
+	ahc_unlock(ahc, &flags);
+
+	if (bootverbose)
+		printk("%s: SCSI bus reset delivered. "
+		       "%d SCBs aborted.\n", ahc_name(ahc), found);
+
+	return SUCCESS;
+}
+
+struct scsi_host_template aic7xxx_driver_template = {
+	.module			= THIS_MODULE,
+	.name			= "aic7xxx",
+	.proc_name		= "aic7xxx",
+	.show_info		= ahc_linux_show_info,
+	.write_info		= ahc_proc_write_seeprom,
+	.info			= ahc_linux_info,
+	.queuecommand		= ahc_linux_queue,
+	.eh_abort_handler	= ahc_linux_abort,
+	.eh_device_reset_handler = ahc_linux_dev_reset,
+	.eh_bus_reset_handler	= ahc_linux_bus_reset,
+#if defined(__i386__)
+	.bios_param		= ahc_linux_biosparam,
+#endif
+	.can_queue		= AHC_MAX_QUEUE,
+	.this_id		= -1,
+	.max_sectors		= 8192,
+	.cmd_per_lun		= 2,
+	.use_clustering		= ENABLE_CLUSTERING,
+	.slave_alloc		= ahc_linux_slave_alloc,
+	.slave_configure	= ahc_linux_slave_configure,
+	.target_alloc		= ahc_linux_target_alloc,
+	.target_destroy		= ahc_linux_target_destroy,
+	.use_blk_tags		= 1,
+};
+
+/**************************** Tasklet Handler *********************************/
+
+/******************************** Macros **************************************/
+#define BUILD_SCSIID(ahc, cmd)						    \
+	((((cmd)->device->id << TID_SHIFT) & TID)			    \
+	| (((cmd)->device->channel == 0) ? (ahc)->our_id : (ahc)->our_id_b) \
+	| (((cmd)->device->channel == 0) ? 0 : TWIN_CHNLB))
+
+/******************************** Bus DMA *************************************/
+int
+ahc_dma_tag_create(struct ahc_softc *ahc, 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
+ahc_dma_tag_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat)
+{
+	kfree(dmat);
+}
+
+int
+ahc_dmamem_alloc(struct ahc_softc *ahc, bus_dma_tag_t dmat, void** vaddr,
+		 int flags, bus_dmamap_t *mapp)
+{
+	*vaddr = pci_alloc_consistent(ahc->dev_softc,
+				      dmat->maxsize, mapp);
+	if (*vaddr == NULL)
+		return ENOMEM;
+	return 0;
+}
+
+void
+ahc_dmamem_free(struct ahc_softc *ahc, bus_dma_tag_t dmat,
+		void* vaddr, bus_dmamap_t map)
+{
+	pci_free_consistent(ahc->dev_softc, dmat->maxsize,
+			    vaddr, map);
+}
+
+int
+ahc_dmamap_load(struct ahc_softc *ahc, 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
+ahc_dmamap_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
+{
+}
+
+int
+ahc_dmamap_unload(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
+{
+	/* Nothing to do */
+	return (0);
+}
+
+static void
+ahc_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(aic7xxx_tag_info); i++) {
+		for (j = 0; j < AHC_NUM_TARGETS; j++) {
+			aic7xxx_tag_info[i].tag_commands[j] = tags;
+		}
+	}
+}
+
+static void
+ahc_linux_setup_tag_info(u_long arg, int instance, int targ, int32_t value)
+{
+
+	if ((instance >= 0) && (targ >= 0)
+	 && (instance < ARRAY_SIZE(aic7xxx_tag_info))
+	 && (targ < AHC_NUM_TARGETS)) {
+		aic7xxx_tag_info[instance].tag_commands[targ] = value & 0xff;
+		if (bootverbose)
+			printk("tag_info[%d:%d] = %d\n", instance, targ, value);
+	}
+}
+
+static char *
+ahc_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. aic7xxx=stpwlev:1,extended
+ */
+static int
+aic7xxx_setup(char *s)
+{
+	int	i, n;
+	char   *p;
+	char   *end;
+
+	static const struct {
+		const char *name;
+		uint32_t *flag;
+	} options[] = {
+		{ "extended", &aic7xxx_extended },
+		{ "no_reset", &aic7xxx_no_reset },
+		{ "verbose", &aic7xxx_verbose },
+		{ "allow_memio", &aic7xxx_allow_memio},
+#ifdef AHC_DEBUG
+		{ "debug", &ahc_debug },
+#endif
+		{ "periodic_otag", &aic7xxx_periodic_otag },
+		{ "pci_parity", &aic7xxx_pci_parity },
+		{ "seltime", &aic7xxx_seltime },
+		{ "tag_info", NULL },
+		{ "global_tag_depth", NULL },
+		{ "dv", NULL }
+	};
+
+	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) {
+			ahc_linux_setup_tag_info_global(p + n);
+		} else if (strncmp(p, "tag_info", n) == 0) {
+			s = ahc_parse_brace_option("tag_info", p + n, end,
+			    2, ahc_linux_setup_tag_info, 0);
+		} else if (p[n] == ':') {
+			*(options[i].flag) = simple_strtoul(p + n + 1, NULL, 0);
+		} else if (strncmp(p, "verbose", n) == 0) {
+			*(options[i].flag) = 1;
+		} else {
+			*(options[i].flag) ^= 0xFFFFFFFF;
+		}
+	}
+	return 1;
+}
+
+__setup("aic7xxx=", aic7xxx_setup);
+
+uint32_t aic7xxx_verbose;
+
+int
+ahc_linux_register_host(struct ahc_softc *ahc, struct scsi_host_template *template)
+{
+	char	buf[80];
+	struct	Scsi_Host *host;
+	char	*new_name;
+	u_long	s;
+	int	retval;
+
+	template->name = ahc->description;
+	host = scsi_host_alloc(template, sizeof(struct ahc_softc *));
+	if (host == NULL)
+		return (ENOMEM);
+
+	*((struct ahc_softc **)host->hostdata) = ahc;
+	ahc->platform_data->host = host;
+	host->can_queue = AHC_MAX_QUEUE;
+	host->cmd_per_lun = 2;
+	/* XXX No way to communicate the ID for multiple channels */
+	host->this_id = ahc->our_id;
+	host->irq = ahc->platform_data->irq;
+	host->max_id = (ahc->features & AHC_WIDE) ? 16 : 8;
+	host->max_lun = AHC_NUM_LUNS;
+	host->max_channel = (ahc->features & AHC_TWIN) ? 1 : 0;
+	host->sg_tablesize = AHC_NSEG;
+	ahc_lock(ahc, &s);
+	ahc_set_unit(ahc, ahc_linux_unit++);
+	ahc_unlock(ahc, &s);
+	sprintf(buf, "scsi%d", host->host_no);
+	new_name = kmalloc(strlen(buf) + 1, GFP_ATOMIC);
+	if (new_name != NULL) {
+		strcpy(new_name, buf);
+		ahc_set_name(ahc, new_name);
+	}
+	host->unique_id = ahc->unit;
+	ahc_linux_initialize_scsi_bus(ahc);
+	ahc_intr_enable(ahc, TRUE);
+
+	host->transportt = ahc_linux_transport_template;
+
+	retval = scsi_add_host(host,
+			(ahc->dev_softc ? &ahc->dev_softc->dev : NULL));
+	if (retval) {
+		printk(KERN_WARNING "aic7xxx: 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.
+ */
+void
+ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc)
+{
+	int i;
+	int numtarg;
+	unsigned long s;
+
+	i = 0;
+	numtarg = 0;
+
+	ahc_lock(ahc, &s);
+
+	if (aic7xxx_no_reset != 0)
+		ahc->flags &= ~(AHC_RESET_BUS_A|AHC_RESET_BUS_B);
+
+	if ((ahc->flags & AHC_RESET_BUS_A) != 0)
+		ahc_reset_channel(ahc, 'A', /*initiate_reset*/TRUE);
+	else
+		numtarg = (ahc->features & AHC_WIDE) ? 16 : 8;
+
+	if ((ahc->features & AHC_TWIN) != 0) {
+
+		if ((ahc->flags & AHC_RESET_BUS_B) != 0) {
+			ahc_reset_channel(ahc, 'B', /*initiate_reset*/TRUE);
+		} else {
+			if (numtarg == 0)
+				i = 8;
+			numtarg += 8;
+		}
+	}
+
+	/*
+	 * Force negotiation to async for all targets that
+	 * will not see an initial bus reset.
+	 */
+	for (; i < numtarg; i++) {
+		struct ahc_devinfo devinfo;
+		struct ahc_initiator_tinfo *tinfo;
+		struct ahc_tmode_tstate *tstate;
+		u_int our_id;
+		u_int target_id;
+		char channel;
+
+		channel = 'A';
+		our_id = ahc->our_id;
+		target_id = i;
+		if (i > 7 && (ahc->features & AHC_TWIN) != 0) {
+			channel = 'B';
+			our_id = ahc->our_id_b;
+			target_id = i % 8;
+		}
+		tinfo = ahc_fetch_transinfo(ahc, channel, our_id,
+					    target_id, &tstate);
+		ahc_compile_devinfo(&devinfo, our_id, target_id,
+				    CAM_LUN_WILDCARD, channel, ROLE_INITIATOR);
+		ahc_update_neg_request(ahc, &devinfo, tstate,
+				       tinfo, AHC_NEG_ALWAYS);
+	}
+	ahc_unlock(ahc, &s);
+	/* Give the bus some time to recover */
+	if ((ahc->flags & (AHC_RESET_BUS_A|AHC_RESET_BUS_B)) != 0) {
+		ahc_linux_freeze_simq(ahc);
+		msleep(AIC7XXX_RESET_DELAY);
+		ahc_linux_release_simq(ahc);
+	}
+}
+
+int
+ahc_platform_alloc(struct ahc_softc *ahc, void *platform_arg)
+{
+
+	ahc->platform_data =
+	    kzalloc(sizeof(struct ahc_platform_data), GFP_ATOMIC);
+	if (ahc->platform_data == NULL)
+		return (ENOMEM);
+	ahc->platform_data->irq = AHC_LINUX_NOIRQ;
+	ahc_lockinit(ahc);
+	ahc->seltime = (aic7xxx_seltime & 0x3) << 4;
+	ahc->seltime_b = (aic7xxx_seltime & 0x3) << 4;
+	if (aic7xxx_pci_parity == 0)
+		ahc->flags |= AHC_DISABLE_PCI_PERR;
+
+	return (0);
+}
+
+void
+ahc_platform_free(struct ahc_softc *ahc)
+{
+	struct scsi_target *starget;
+	int i;
+
+	if (ahc->platform_data != NULL) {
+		/* destroy all of the device and target objects */
+		for (i = 0; i < AHC_NUM_TARGETS; i++) {
+			starget = ahc->platform_data->starget[i];
+			if (starget != NULL) {
+				ahc->platform_data->starget[i] = NULL;
+ 			}
+ 		}
+
+		if (ahc->platform_data->irq != AHC_LINUX_NOIRQ)
+			free_irq(ahc->platform_data->irq, ahc);
+		if (ahc->tag == BUS_SPACE_PIO
+		 && ahc->bsh.ioport != 0)
+			release_region(ahc->bsh.ioport, 256);
+		if (ahc->tag == BUS_SPACE_MEMIO
+		 && ahc->bsh.maddr != NULL) {
+			iounmap(ahc->bsh.maddr);
+			release_mem_region(ahc->platform_data->mem_busaddr,
+					   0x1000);
+		}
+
+		if (ahc->platform_data->host)
+			scsi_host_put(ahc->platform_data->host);
+
+		kfree(ahc->platform_data);
+	}
+}
+
+void
+ahc_platform_freeze_devq(struct ahc_softc *ahc, struct scb *scb)
+{
+	ahc_platform_abort_scbs(ahc, SCB_GET_TARGET(ahc, scb),
+				SCB_GET_CHANNEL(ahc, scb),
+				SCB_GET_LUN(scb), SCB_LIST_NULL,
+				ROLE_UNKNOWN, CAM_REQUEUE_REQ);
+}
+
+void
+ahc_platform_set_tags(struct ahc_softc *ahc, struct scsi_device *sdev,
+		      struct ahc_devinfo *devinfo, ahc_queue_alg alg)
+{
+	struct ahc_linux_device *dev;
+	int was_queuing;
+	int now_queuing;
+
+	if (sdev == NULL)
+		return;
+	dev = scsi_transport_device_data(sdev);
+
+	was_queuing = dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED);
+	switch (alg) {
+	default:
+	case AHC_QUEUE_NONE:
+		now_queuing = 0;
+		break; 
+	case AHC_QUEUE_BASIC:
+		now_queuing = AHC_DEV_Q_BASIC;
+		break;
+	case AHC_QUEUE_TAGGED:
+		now_queuing = AHC_DEV_Q_TAGGED;
+		break;
+	}
+	if ((dev->flags & AHC_DEV_FREEZE_TIL_EMPTY) == 0
+	 && (was_queuing != now_queuing)
+	 && (dev->active != 0)) {
+		dev->flags |= AHC_DEV_FREEZE_TIL_EMPTY;
+		dev->qfrozen++;
+	}
+
+	dev->flags &= ~(AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED|AHC_DEV_PERIODIC_OTAG);
+	if (now_queuing) {
+		u_int usertags;
+
+		usertags = ahc_linux_user_tagdepth(ahc, 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 == AHC_QUEUE_TAGGED) {
+			dev->flags |= AHC_DEV_Q_TAGGED;
+			if (aic7xxx_periodic_otag != 0)
+				dev->flags |= AHC_DEV_PERIODIC_OTAG;
+		} else
+			dev->flags |= AHC_DEV_Q_BASIC;
+	} else {
+		/* We can only have one opening. */
+		dev->maxtags = 0;
+		dev->openings =  1 - dev->active;
+	}
+	switch ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED))) {
+	case AHC_DEV_Q_BASIC:
+	case AHC_DEV_Q_TAGGED:
+		scsi_change_queue_depth(sdev,
+				dev->openings + dev->active);
+	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, 2);
+		break;
+	}
+}
+
+int
+ahc_platform_abort_scbs(struct ahc_softc *ahc, int target, char channel,
+			int lun, u_int tag, role_t role, uint32_t status)
+{
+	return 0;
+}
+
+static u_int
+ahc_linux_user_tagdepth(struct ahc_softc *ahc, struct ahc_devinfo *devinfo)
+{
+	static int warned_user;
+	u_int tags;
+
+	tags = 0;
+	if ((ahc->user_discenable & devinfo->target_mask) != 0) {
+		if (ahc->unit >= ARRAY_SIZE(aic7xxx_tag_info)) {
+			if (warned_user == 0) {
+
+				printk(KERN_WARNING
+"aic7xxx: WARNING: Insufficient tag_info instances\n"
+"aic7xxx: for installed controllers. Using defaults\n"
+"aic7xxx: Please update the aic7xxx_tag_info array in\n"
+"aic7xxx: the aic7xxx_osm..c source file.\n");
+				warned_user++;
+			}
+			tags = AHC_MAX_QUEUE;
+		} else {
+			adapter_tag_info_t *tag_info;
+
+			tag_info = &aic7xxx_tag_info[ahc->unit];
+			tags = tag_info->tag_commands[devinfo->target_offset];
+			if (tags > AHC_MAX_QUEUE)
+				tags = AHC_MAX_QUEUE;
+		}
+	}
+	return (tags);
+}
+
+/*
+ * Determines the queue depth for a given device.
+ */
+static void
+ahc_linux_device_queue_depth(struct scsi_device *sdev)
+{
+	struct	ahc_devinfo devinfo;
+	u_int	tags;
+	struct ahc_softc *ahc = *((struct ahc_softc **)sdev->host->hostdata);
+
+	ahc_compile_devinfo(&devinfo,
+			    sdev->sdev_target->channel == 0
+			  ? ahc->our_id : ahc->our_id_b,
+			    sdev->sdev_target->id, sdev->lun,
+			    sdev->sdev_target->channel == 0 ? 'A' : 'B',
+			    ROLE_INITIATOR);
+	tags = ahc_linux_user_tagdepth(ahc, &devinfo);
+	if (tags != 0 && sdev->tagged_supported != 0) {
+
+		ahc_platform_set_tags(ahc, sdev, &devinfo, AHC_QUEUE_TAGGED);
+		ahc_send_async(ahc, devinfo.channel, devinfo.target,
+			       devinfo.lun, AC_TRANSFER_NEG);
+		ahc_print_devinfo(ahc, &devinfo);
+		printk("Tagged Queuing enabled.  Depth %d\n", tags);
+	} else {
+		ahc_platform_set_tags(ahc, sdev, &devinfo, AHC_QUEUE_NONE);
+		ahc_send_async(ahc, devinfo.channel, devinfo.target,
+			       devinfo.lun, AC_TRANSFER_NEG);
+	}
+}
+
+static int
+ahc_linux_run_command(struct ahc_softc *ahc, struct ahc_linux_device *dev,
+		      struct scsi_cmnd *cmd)
+{
+	struct	 scb *scb;
+	struct	 hardware_scb *hscb;
+	struct	 ahc_initiator_tinfo *tinfo;
+	struct	 ahc_tmode_tstate *tstate;
+	uint16_t mask;
+	struct scb_tailq *untagged_q = NULL;
+	int nseg;
+
+	/*
+	 * Schedule us to run later.  The only reason we are not
+	 * running is because the whole controller Q is frozen.
+	 */
+	if (ahc->platform_data->qfrozen != 0)
+		return SCSI_MLQUEUE_HOST_BUSY;
+
+	/*
+	 * We only allow one untagged transaction
+	 * per target in the initiator role unless
+	 * we are storing a full busy target *lun*
+	 * table in SCB space.
+	 */
+	if (!(cmd->flags & SCMD_TAGGED)
+	    && (ahc->features & AHC_SCB_BTT) == 0) {
+		int target_offset;
+
+		target_offset = cmd->device->id + cmd->device->channel * 8;
+		untagged_q = &(ahc->untagged_queues[target_offset]);
+		if (!TAILQ_EMPTY(untagged_q))
+			/* if we're already executing an untagged command
+			 * we're busy to another */
+			return SCSI_MLQUEUE_DEVICE_BUSY;
+	}
+
+	nseg = scsi_dma_map(cmd);
+	if (nseg < 0)
+		return SCSI_MLQUEUE_HOST_BUSY;
+
+	/*
+	 * Get an scb to use.
+	 */
+	scb = ahc_get_scb(ahc);
+	if (!scb) {
+		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(ahc, cmd);
+	hscb->lun = cmd->device->lun;
+	mask = SCB_GET_TARGET_MASK(ahc, scb);
+	tinfo = ahc_fetch_transinfo(ahc, SCB_GET_CHANNEL(ahc, scb),
+				    SCB_GET_OUR_ID(scb),
+				    SCB_GET_TARGET(ahc, scb), &tstate);
+	hscb->scsirate = tinfo->scsirate;
+	hscb->scsioffset = tinfo->curr.offset;
+	if ((tstate->ultraenb & mask) != 0)
+		hscb->control |= ULTRAENB;
+	
+	if ((ahc->user_discenable & mask) != 0)
+		hscb->control |= DISCENB;
+	
+	if ((tstate->auto_negotiate & mask) != 0) {
+		scb->flags |= SCB_AUTO_NEGOTIATE;
+		scb->hscb->control |= MK_MESSAGE;
+	}
+
+	if ((dev->flags & (AHC_DEV_Q_TAGGED|AHC_DEV_Q_BASIC)) != 0) {
+		if (dev->commands_since_idle_or_otag == AHC_OTAG_THRESH
+				&& (dev->flags & AHC_DEV_Q_TAGGED) != 0) {
+			hscb->control |= MSG_ORDERED_TASK;
+			dev->commands_since_idle_or_otag = 0;
+		} else {
+			hscb->control |= MSG_SIMPLE_TASK;
+		}
+	}
+
+	hscb->cdb_len = cmd->cmd_len;
+	if (hscb->cdb_len <= 12) {
+		memcpy(hscb->shared_data.cdb, cmd->cmnd, hscb->cdb_len);
+	} else {
+		memcpy(hscb->cdb32, cmd->cmnd, hscb->cdb_len);
+		scb->flags |= SCB_CDB32_PTR;
+	}
+
+	scb->platform_data->xfer_len = 0;
+	ahc_set_residual(scb, 0);
+	ahc_set_sense_residual(scb, 0);
+	scb->sg_count = 0;
+
+	if (nseg > 0) {
+		struct	ahc_dma_seg *sg;
+		struct	scatterlist *cur_seg;
+		int i;
+
+		/* Copy the segments into the SG list. */
+		sg = scb->sg_list;
+		/*
+		 * The sg_count may be larger than nseg if
+		 * a transfer crosses a 32bit page.
+		 */
+		scsi_for_each_sg(cmd, cur_seg, nseg, i) {
+			dma_addr_t addr;
+			bus_size_t len;
+			int consumed;
+
+			addr = sg_dma_address(cur_seg);
+			len = sg_dma_len(cur_seg);
+			consumed = ahc_linux_map_seg(ahc, scb,
+						     sg, addr, len);
+			sg += consumed;
+			scb->sg_count += consumed;
+		}
+		sg--;
+		sg->len |= ahc_htole32(AHC_DMA_LAST_SEG);
+
+		/*
+		 * Reset the sg list pointer.
+		 */
+		scb->hscb->sgptr =
+			ahc_htole32(scb->sg_list_phys | SG_FULL_RESID);
+		
+		/*
+		 * Copy the first SG into the "current"
+		 * data pointer area.
+		 */
+		scb->hscb->dataptr = scb->sg_list->addr;
+		scb->hscb->datacnt = scb->sg_list->len;
+	} else {
+		scb->hscb->sgptr = ahc_htole32(SG_LIST_NULL);
+		scb->hscb->dataptr = 0;
+		scb->hscb->datacnt = 0;
+		scb->sg_count = 0;
+	}
+
+	LIST_INSERT_HEAD(&ahc->pending_scbs, scb, pending_links);
+	dev->openings--;
+	dev->active++;
+	dev->commands_issued++;
+	if ((dev->flags & AHC_DEV_PERIODIC_OTAG) != 0)
+		dev->commands_since_idle_or_otag++;
+	
+	scb->flags |= SCB_ACTIVE;
+	if (untagged_q) {
+		TAILQ_INSERT_TAIL(untagged_q, scb, links.tqe);
+		scb->flags |= SCB_UNTAGGEDQ;
+	}
+	ahc_queue_scb(ahc, scb);
+	return 0;
+}
+
+/*
+ * SCSI controller interrupt handler.
+ */
+irqreturn_t
+ahc_linux_isr(int irq, void *dev_id)
+{
+	struct	ahc_softc *ahc;
+	u_long	flags;
+	int	ours;
+
+	ahc = (struct ahc_softc *) dev_id;
+	ahc_lock(ahc, &flags); 
+	ours = ahc_intr(ahc);
+	ahc_unlock(ahc, &flags);
+	return IRQ_RETVAL(ours);
+}
+
+void
+ahc_platform_flushwork(struct ahc_softc *ahc)
+{
+
+}
+
+void
+ahc_send_async(struct ahc_softc *ahc, char channel,
+	       u_int target, u_int lun, ac_code code)
+{
+	switch (code) {
+	case AC_TRANSFER_NEG:
+	{
+		struct	scsi_target *starget;
+		struct	ahc_linux_target *targ;
+		struct	ahc_initiator_tinfo *tinfo;
+		struct	ahc_tmode_tstate *tstate;
+		int	target_offset;
+		unsigned int target_ppr_options;
+
+		BUG_ON(target == CAM_TARGET_WILDCARD);
+
+		tinfo = ahc_fetch_transinfo(ahc, channel,
+						channel == 'A' ? ahc->our_id
+							       : ahc->our_id_b,
+						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.
+		 */
+		target_offset = target;
+		if (channel == 'B')
+			target_offset += 8;
+		starget = ahc->platform_data->starget[target_offset];
+		if (starget == NULL)
+			break;
+		targ = scsi_transport_target_data(starget);
+
+		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);
+
+		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_display_xfer_agreement(starget);
+		break;
+	}
+        case AC_SENT_BDR:
+	{
+		WARN_ON(lun != CAM_LUN_WILDCARD);
+		scsi_report_device_reset(ahc->platform_data->host,
+					 channel - 'A', target);
+		break;
+	}
+        case AC_BUS_RESET:
+		if (ahc->platform_data->host != NULL) {
+			scsi_report_bus_reset(ahc->platform_data->host,
+					      channel - 'A');
+		}
+                break;
+        default:
+                panic("ahc_send_async: Unexpected async event");
+        }
+}
+
+/*
+ * Calls the higher level scsi done function and frees the scb.
+ */
+void
+ahc_done(struct ahc_softc *ahc, struct scb *scb)
+{
+	struct scsi_cmnd *cmd;
+	struct	   ahc_linux_device *dev;
+
+	LIST_REMOVE(scb, pending_links);
+	if ((scb->flags & SCB_UNTAGGEDQ) != 0) {
+		struct scb_tailq *untagged_q;
+		int target_offset;
+
+		target_offset = SCB_GET_TARGET_OFFSET(ahc, scb);
+		untagged_q = &(ahc->untagged_queues[target_offset]);
+		TAILQ_REMOVE(untagged_q, scb, links.tqe);
+		BUG_ON(!TAILQ_EMPTY(untagged_q));
+	} else if ((scb->flags & SCB_ACTIVE) == 0) {
+		/*
+		 * Transactions aborted from the untagged queue may
+		 * not have been dispatched to the controller, so
+		 * only check the SCB_ACTIVE flag for tagged transactions.
+		 */
+		printk("SCB %d done'd twice\n", scb->hscb->tag);
+		ahc_dump_card_state(ahc);
+		panic("Stopping for safety");
+	}
+	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--;
+	}
+	ahc_linux_unmap_scb(ahc, 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 (ahc_get_transaction_status(scb) == CAM_REQ_INPROG) {
+		uint32_t amount_xferred;
+
+		amount_xferred =
+		    ahc_get_transfer_length(scb) - ahc_get_residual(scb);
+		if ((scb->flags & SCB_TRANSMISSION_ERROR) != 0) {
+#ifdef AHC_DEBUG
+			if ((ahc_debug & AHC_SHOW_MISC) != 0) {
+				ahc_print_path(ahc, scb);
+				printk("Set CAM_UNCOR_PARITY\n");
+			}
+#endif
+			ahc_set_transaction_status(scb, CAM_UNCOR_PARITY);
+#ifdef AHC_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;
+
+			ahc_print_path(ahc, scb);
+			printk("CDB:");
+			for (i = 0; i < scb->io_ctx->cmd_len; i++)
+				printk(" 0x%x", scb->io_ctx->cmnd[i]);
+			printk("\n");
+			ahc_print_path(ahc, scb);
+			printk("Saw underflow (%ld of %ld bytes). "
+			       "Treated as error\n",
+				ahc_get_residual(scb),
+				ahc_get_transfer_length(scb));
+			ahc_set_transaction_status(scb, CAM_DATA_RUN_ERR);
+#endif
+		} else {
+			ahc_set_transaction_status(scb, CAM_REQ_CMP);
+		}
+	} else if (ahc_get_transaction_status(scb) == CAM_SCSI_STATUS_ERROR) {
+		ahc_linux_handle_scsi_status(ahc, cmd->device, scb);
+	}
+
+	if (dev->openings == 1
+	 && ahc_get_transaction_status(scb) == CAM_REQ_CMP
+	 && ahc_get_scsi_status(scb) != SCSI_STATUS_QUEUE_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 > AHC_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 (ahc_get_transaction_status(scb) == CAM_BDR_SENT
+		 || ahc_get_transaction_status(scb) == CAM_REQ_ABORTED)
+			ahc_set_transaction_status(scb, CAM_CMD_TIMEOUT);
+
+		if (ahc->platform_data->eh_done)
+			complete(ahc->platform_data->eh_done);
+	}
+
+	ahc_free_scb(ahc, scb);
+	ahc_linux_queue_cmd_complete(ahc, cmd);
+}
+
+static void
+ahc_linux_handle_scsi_status(struct ahc_softc *ahc,
+			     struct scsi_device *sdev, struct scb *scb)
+{
+	struct	ahc_devinfo devinfo;
+	struct ahc_linux_device *dev = scsi_transport_device_data(sdev);
+
+	ahc_compile_devinfo(&devinfo,
+			    ahc->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 (ahc_get_scsi_status(scb)) {
+	default:
+		break;
+	case SCSI_STATUS_CHECK_COND:
+	case SCSI_STATUS_CMD_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) {
+			u_int sense_size;
+
+			sense_size = min(sizeof(struct scsi_sense_data)
+				       - ahc_get_sense_residual(scb),
+					 (u_long)SCSI_SENSE_BUFFERSIZE);
+			memcpy(cmd->sense_buffer,
+			       ahc_get_sense_buf(ahc, scb), sense_size);
+			if (sense_size < SCSI_SENSE_BUFFERSIZE)
+				memset(&cmd->sense_buffer[sense_size], 0,
+				       SCSI_SENSE_BUFFERSIZE - sense_size);
+			cmd->result |= (DRIVER_SENSE << 24);
+#ifdef AHC_DEBUG
+			if (ahc_debug & AHC_SHOW_SENSE) {
+				int i;
+
+				printk("Copied %d bytes of sense data:",
+				       sense_size);
+				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 SCSI_STATUS_QUEUE_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;
+/*
+			ahc_print_path(ahc, scb);
+			printk("Dropping tag count to %d\n", dev->active);
+ */
+			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
+				 == AHC_LOCK_TAGS_COUNT) {
+					dev->maxtags = dev->active;
+					ahc_print_path(ahc, 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;
+			}
+			ahc_set_transaction_status(scb, CAM_REQUEUE_REQ);
+			ahc_set_scsi_status(scb, SCSI_STATUS_OK);
+			ahc_platform_set_tags(ahc, sdev, &devinfo,
+				     (dev->flags & AHC_DEV_Q_BASIC)
+				   ? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
+			break;
+		}
+		/*
+		 * Drop down to a single opening, and treat this
+		 * as if the target returned BUSY SCSI status.
+		 */
+		dev->openings = 1;
+		ahc_set_scsi_status(scb, SCSI_STATUS_BUSY);
+		ahc_platform_set_tags(ahc, sdev, &devinfo,
+			     (dev->flags & AHC_DEV_Q_BASIC)
+			   ? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
+		break;
+	}
+	}
+}
+
+static void
+ahc_linux_queue_cmd_complete(struct ahc_softc *ahc, struct scsi_cmnd *cmd)
+{
+	/*
+	 * 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.
+	 */
+	{
+		u_int new_status;
+
+		switch (ahc_cmd_get_transaction_status(cmd)) {
+		case CAM_REQ_INPROG:
+		case CAM_REQ_CMP:
+		case CAM_SCSI_STATUS_ERROR:
+			new_status = DID_OK;
+			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;
+			break;
+		case CAM_CMD_TIMEOUT:
+			new_status = DID_TIME_OUT;
+			break;
+		case CAM_UA_ABORT:
+		case CAM_REQ_CMP_ERR:
+		case CAM_AUTOSENSE_FAIL:
+		case CAM_NO_HBA:
+		case CAM_DATA_RUN_ERR:
+		case CAM_UNEXP_BUSFREE:
+		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;
+		}
+
+		ahc_cmd_set_transaction_status(cmd, new_status);
+	}
+
+	cmd->scsi_done(cmd);
+}
+
+static void
+ahc_linux_freeze_simq(struct ahc_softc *ahc)
+{
+	unsigned long s;
+
+	ahc_lock(ahc, &s);
+	ahc->platform_data->qfrozen++;
+	if (ahc->platform_data->qfrozen == 1) {
+		scsi_block_requests(ahc->platform_data->host);
+
+		/* XXX What about Twin channels? */
+		ahc_platform_abort_scbs(ahc, CAM_TARGET_WILDCARD, ALL_CHANNELS,
+					CAM_LUN_WILDCARD, SCB_LIST_NULL,
+					ROLE_INITIATOR, CAM_REQUEUE_REQ);
+	}
+	ahc_unlock(ahc, &s);
+}
+
+static void
+ahc_linux_release_simq(struct ahc_softc *ahc)
+{
+	u_long s;
+	int    unblock_reqs;
+
+	unblock_reqs = 0;
+	ahc_lock(ahc, &s);
+	if (ahc->platform_data->qfrozen > 0)
+		ahc->platform_data->qfrozen--;
+	if (ahc->platform_data->qfrozen == 0)
+		unblock_reqs = 1;
+	ahc_unlock(ahc, &s);
+	/*
+	 * There is still a race here.  The mid-layer
+	 * should keep its own freeze count and use
+	 * a bottom half handler to run the queues
+	 * so we can unblock with our own lock held.
+	 */
+	if (unblock_reqs)
+		scsi_unblock_requests(ahc->platform_data->host);
+}
+
+static int
+ahc_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag)
+{
+	struct ahc_softc *ahc;
+	struct ahc_linux_device *dev;
+	struct scb *pending_scb;
+	u_int  saved_scbptr;
+	u_int  active_scb_index;
+	u_int  last_phase;
+	u_int  saved_scsiid;
+	u_int  cdb_byte;
+	int    retval;
+	int    was_paused;
+	int    paused;
+	int    wait;
+	int    disconnected;
+	unsigned long flags;
+
+	pending_scb = NULL;
+	paused = FALSE;
+	wait = FALSE;
+	ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
+
+	scmd_printk(KERN_INFO, cmd, "Attempting to queue a%s message\n",
+	       flag == SCB_ABORT ? "n ABORT" : " TARGET RESET");
+
+	printk("CDB:");
+	for (cdb_byte = 0; cdb_byte < cmd->cmd_len; cdb_byte++)
+		printk(" 0x%x", cmd->cmnd[cdb_byte]);
+	printk("\n");
+
+	ahc_lock(ahc, &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.
+		 */
+		printk("%s:%d:%d:%d: Is not an active device\n",
+		       ahc_name(ahc), cmd->device->channel, cmd->device->id,
+		       (u8)cmd->device->lun);
+		retval = SUCCESS;
+		goto no_cmd;
+	}
+
+	if ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED)) == 0
+	 && ahc_search_untagged_queues(ahc, cmd, cmd->device->id,
+				       cmd->device->channel + 'A',
+				       (u8)cmd->device->lun,
+				       CAM_REQ_ABORTED, SEARCH_COMPLETE) != 0) {
+		printk("%s:%d:%d:%d: Command found on untagged queue\n",
+		       ahc_name(ahc), cmd->device->channel, cmd->device->id,
+		       (u8)cmd->device->lun);
+		retval = SUCCESS;
+		goto done;
+	}
+
+	/*
+	 * See if we can find a matching cmd in the pending list.
+	 */
+	LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
+		if (pending_scb->io_ctx == cmd)
+			break;
+	}
+
+	if (pending_scb == NULL && flag == SCB_DEVICE_RESET) {
+
+		/* Any SCB for this device will do for a target reset */
+		LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
+		  	if (ahc_match_scb(ahc, pending_scb, scmd_id(cmd),
+					  scmd_channel(cmd) + 'A',
+					  CAM_LUN_WILDCARD,
+					  SCB_LIST_NULL, ROLE_INITIATOR))
+				break;
+		}
+	}
+
+	if (pending_scb == NULL) {
+		scmd_printk(KERN_INFO, cmd, "Command not found\n");
+		goto no_cmd;
+	}
+
+	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 and that we didn't "just" miss
+	 * an interrupt that would affect this cmd.
+	 */
+	was_paused = ahc_is_paused(ahc);
+	ahc_pause_and_flushwork(ahc);
+	paused = TRUE;
+
+	if ((pending_scb->flags & SCB_ACTIVE) == 0) {
+		scmd_printk(KERN_INFO, cmd, "Command already completed\n");
+		goto no_cmd;
+	}
+
+	printk("%s: At time of recovery, card was %spaused\n",
+	       ahc_name(ahc), was_paused ? "" : "not ");
+	ahc_dump_card_state(ahc);
+
+	disconnected = TRUE;
+	if (flag == SCB_ABORT) {
+		if (ahc_search_qinfifo(ahc, 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",
+			       ahc_name(ahc), cmd->device->channel,
+			       cmd->device->id, (u8)cmd->device->lun);
+			retval = SUCCESS;
+			goto done;
+		}
+	} else if (ahc_search_qinfifo(ahc, cmd->device->id,
+				      cmd->device->channel + 'A',
+				      cmd->device->lun,
+				      pending_scb->hscb->tag,
+				      ROLE_INITIATOR, /*status*/0,
+				      SEARCH_COUNT) > 0) {
+		disconnected = FALSE;
+	}
+
+	if (disconnected && (ahc_inb(ahc, SEQ_FLAGS) & NOT_IDENTIFIED) == 0) {
+		struct scb *bus_scb;
+
+		bus_scb = ahc_lookup_scb(ahc, ahc_inb(ahc, SCB_TAG));
+		if (bus_scb == pending_scb)
+			disconnected = FALSE;
+		else if (flag != SCB_ABORT
+		      && ahc_inb(ahc, SAVED_SCSIID) == pending_scb->hscb->scsiid
+		      && ahc_inb(ahc, SAVED_LUN) == SCB_GET_LUN(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, is in the disconnected state, or we're hoping to find
+	 * a command for the same target active on the bus to abuse to
+	 * send a BDR.  Queue the appropriate message based on which of
+	 * these states we are in.
+	 */
+	last_phase = ahc_inb(ahc, LASTPHASE);
+	saved_scbptr = ahc_inb(ahc, SCBPTR);
+	active_scb_index = ahc_inb(ahc, SCB_TAG);
+	saved_scsiid = ahc_inb(ahc, SAVED_SCSIID);
+	if (last_phase != P_BUSFREE
+	 && (pending_scb->hscb->tag == active_scb_index
+	  || (flag == SCB_DEVICE_RESET
+	   && SCSIID_TARGET(ahc, saved_scsiid) == scmd_id(cmd)))) {
+
+		/*
+		 * We're active on the bus, so assert ATN
+		 * and hope that the target responds.
+		 */
+		pending_scb = ahc_lookup_scb(ahc, active_scb_index);
+		pending_scb->flags |= SCB_RECOVERY_SCB|flag;
+		ahc_outb(ahc, MSG_OUT, HOST_MSG);
+		ahc_outb(ahc, 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.
+		 * In either case (selection or reselection),
+		 * we will now issue the approprate message
+		 * to the timed-out device.
+		 *
+		 * Set the MK_MESSAGE control bit indicating
+		 * that we desire to send a message.  We
+		 * also set the disconnected flag since
+		 * in the paging case 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;
+		pending_scb->flags |= SCB_RECOVERY_SCB|flag;
+
+		/*
+		 * Remove any cached copy of this SCB in the
+		 * disconnected list in preparation for the
+		 * queuing of our abort SCB.  We use the
+		 * same element in the SCB, SCB_NEXT, for
+		 * both the qinfifo and the disconnected list.
+		 */
+		ahc_search_disc_list(ahc, cmd->device->id,
+				     cmd->device->channel + 'A',
+				     cmd->device->lun, pending_scb->hscb->tag,
+				     /*stop_on_first*/TRUE,
+				     /*remove*/TRUE,
+				     /*save_state*/FALSE);
+
+		/*
+		 * In the non-paging case, 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.
+		 */
+		if ((ahc->flags & AHC_PAGESCBS) == 0) {
+			ahc_outb(ahc, SCBPTR, pending_scb->hscb->tag);
+			ahc_outb(ahc, SCB_CONTROL,
+				 ahc_inb(ahc, SCB_CONTROL)|MK_MESSAGE);
+		}
+
+		/*
+		 * Clear out any entries in the QINFIFO first
+		 * so we are the next SCB for this target
+		 * to run.
+		 */
+		ahc_search_qinfifo(ahc, cmd->device->id,
+				   cmd->device->channel + 'A',
+				   cmd->device->lun, SCB_LIST_NULL,
+				   ROLE_INITIATOR, CAM_REQUEUE_REQ,
+				   SEARCH_COMPLETE);
+		ahc_qinfifo_requeue_tail(ahc, pending_scb);
+		ahc_outb(ahc, SCBPTR, saved_scbptr);
+		ahc_print_path(ahc, 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;
+		goto done;
+	}
+
+no_cmd:
+	/*
+	 * Our assumption is that if we don't have the command, no
+	 * recovery action was required, so we return success.  Again,
+	 * the semantics of the mid-layer recovery engine are not
+	 * well defined, so this may change in time.
+	 */
+	retval = SUCCESS;
+done:
+	if (paused)
+		ahc_unpause(ahc);
+	if (wait) {
+		DECLARE_COMPLETION_ONSTACK(done);
+
+		ahc->platform_data->eh_done = &done;
+		ahc_unlock(ahc, &flags);
+
+		printk("Recovery code sleeping\n");
+		if (!wait_for_completion_timeout(&done, 5 * HZ)) {
+			ahc_lock(ahc, &flags);
+			ahc->platform_data->eh_done = NULL;
+			ahc_unlock(ahc, &flags);
+
+			printk("Timer Expired\n");
+			retval = FAILED;
+		}
+		printk("Recovery code awake\n");
+	} else
+		ahc_unlock(ahc, &flags);
+	return (retval);
+}
+
+void
+ahc_platform_dump_card_state(struct ahc_softc *ahc)
+{
+}
+
+static void ahc_linux_set_width(struct scsi_target *starget, int width)
+{
+	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
+	struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
+	struct ahc_devinfo devinfo;
+	unsigned long flags;
+
+	ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
+			    starget->channel + 'A', ROLE_INITIATOR);
+	ahc_lock(ahc, &flags);
+	ahc_set_width(ahc, &devinfo, width, AHC_TRANS_GOAL, FALSE);
+	ahc_unlock(ahc, &flags);
+}
+
+static void ahc_linux_set_period(struct scsi_target *starget, int period)
+{
+	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
+	struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
+	struct ahc_tmode_tstate *tstate;
+	struct ahc_initiator_tinfo *tinfo 
+		= ahc_fetch_transinfo(ahc,
+				      starget->channel + 'A',
+				      shost->this_id, starget->id, &tstate);
+	struct ahc_devinfo devinfo;
+	unsigned int ppr_options = tinfo->goal.ppr_options;
+	unsigned long flags;
+	unsigned long offset = tinfo->goal.offset;
+	const struct ahc_syncrate *syncrate;
+
+	if (offset == 0)
+		offset = MAX_OFFSET;
+
+	if (period < 9)
+		period = 9;	/* 12.5ns is our minimum */
+	if (period == 9) {
+		if (spi_max_width(starget))
+			ppr_options |= MSG_EXT_PPR_DT_REQ;
+		else
+			/* need wide for DT and need DT for 12.5 ns */
+			period = 10;
+	}
+
+	ahc_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;
+	}
+
+	syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
+	ahc_lock(ahc, &flags);
+	ahc_set_syncrate(ahc, &devinfo, syncrate, period, offset,
+			 ppr_options, AHC_TRANS_GOAL, FALSE);
+	ahc_unlock(ahc, &flags);
+}
+
+static void ahc_linux_set_offset(struct scsi_target *starget, int offset)
+{
+	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
+	struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
+	struct ahc_tmode_tstate *tstate;
+	struct ahc_initiator_tinfo *tinfo 
+		= ahc_fetch_transinfo(ahc,
+				      starget->channel + 'A',
+				      shost->this_id, starget->id, &tstate);
+	struct ahc_devinfo devinfo;
+	unsigned int ppr_options = 0;
+	unsigned int period = 0;
+	unsigned long flags;
+	const struct ahc_syncrate *syncrate = NULL;
+
+	ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
+			    starget->channel + 'A', ROLE_INITIATOR);
+	if (offset != 0) {
+		syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
+		period = tinfo->goal.period;
+		ppr_options = tinfo->goal.ppr_options;
+	}
+	ahc_lock(ahc, &flags);
+	ahc_set_syncrate(ahc, &devinfo, syncrate, period, offset,
+			 ppr_options, AHC_TRANS_GOAL, FALSE);
+	ahc_unlock(ahc, &flags);
+}
+
+static void ahc_linux_set_dt(struct scsi_target *starget, int dt)
+{
+	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
+	struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
+	struct ahc_tmode_tstate *tstate;
+	struct ahc_initiator_tinfo *tinfo 
+		= ahc_fetch_transinfo(ahc,
+				      starget->channel + 'A',
+				      shost->this_id, starget->id, &tstate);
+	struct ahc_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;
+	const struct ahc_syncrate *syncrate;
+
+	if (dt && spi_max_width(starget)) {
+		ppr_options |= MSG_EXT_PPR_DT_REQ;
+		if (!width)
+			ahc_linux_set_width(starget, 1);
+	} else if (period == 9)
+		period = 10;	/* if resetting DT, period must be >= 25ns */
+
+	ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
+			    starget->channel + 'A', ROLE_INITIATOR);
+	syncrate = ahc_find_syncrate(ahc, &period, &ppr_options,AHC_SYNCRATE_DT);
+	ahc_lock(ahc, &flags);
+	ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
+			 ppr_options, AHC_TRANS_GOAL, FALSE);
+	ahc_unlock(ahc, &flags);
+}
+
+#if 0
+/* FIXME: This code claims to support IU and QAS.  However, the actual
+ * sequencer code and aic7xxx_core have no support for these parameters and
+ * will get into a bad state if they're negotiated.  Do not enable this
+ * unless you know what you're doing */
+static void ahc_linux_set_qas(struct scsi_target *starget, int qas)
+{
+	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
+	struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
+	struct ahc_tmode_tstate *tstate;
+	struct ahc_initiator_tinfo *tinfo 
+		= ahc_fetch_transinfo(ahc,
+				      starget->channel + 'A',
+				      shost->this_id, starget->id, &tstate);
+	struct ahc_devinfo devinfo;
+	unsigned int ppr_options = tinfo->goal.ppr_options
+		& ~MSG_EXT_PPR_QAS_REQ;
+	unsigned int period = tinfo->goal.period;
+	unsigned long flags;
+	struct ahc_syncrate *syncrate;
+
+	if (qas)
+		ppr_options |= MSG_EXT_PPR_QAS_REQ;
+
+	ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
+			    starget->channel + 'A', ROLE_INITIATOR);
+	syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
+	ahc_lock(ahc, &flags);
+	ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
+			 ppr_options, AHC_TRANS_GOAL, FALSE);
+	ahc_unlock(ahc, &flags);
+}
+
+static void ahc_linux_set_iu(struct scsi_target *starget, int iu)
+{
+	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
+	struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
+	struct ahc_tmode_tstate *tstate;
+	struct ahc_initiator_tinfo *tinfo 
+		= ahc_fetch_transinfo(ahc,
+				      starget->channel + 'A',
+				      shost->this_id, starget->id, &tstate);
+	struct ahc_devinfo devinfo;
+	unsigned int ppr_options = tinfo->goal.ppr_options
+		& ~MSG_EXT_PPR_IU_REQ;
+	unsigned int period = tinfo->goal.period;
+	unsigned long flags;
+	struct ahc_syncrate *syncrate;
+
+	if (iu)
+		ppr_options |= MSG_EXT_PPR_IU_REQ;
+
+	ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
+			    starget->channel + 'A', ROLE_INITIATOR);
+	syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
+	ahc_lock(ahc, &flags);
+	ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
+			 ppr_options, AHC_TRANS_GOAL, FALSE);
+	ahc_unlock(ahc, &flags);
+}
+#endif
+
+static void ahc_linux_get_signalling(struct Scsi_Host *shost)
+{
+	struct ahc_softc *ahc = *(struct ahc_softc **)shost->hostdata;
+	unsigned long flags;
+	u8 mode;
+
+	if (!(ahc->features & AHC_ULTRA2)) {
+		/* non-LVD chipset, may not have SBLKCTL reg */
+		spi_signalling(shost) = 
+			ahc->features & AHC_HVD ?
+			SPI_SIGNAL_HVD :
+			SPI_SIGNAL_SE;
+		return;
+	}
+
+	ahc_lock(ahc, &flags);
+	ahc_pause(ahc);
+	mode = ahc_inb(ahc, SBLKCTL);
+	ahc_unpause(ahc);
+	ahc_unlock(ahc, &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 ahc_linux_transport_functions = {
+	.set_offset	= ahc_linux_set_offset,
+	.show_offset	= 1,
+	.set_period	= ahc_linux_set_period,
+	.show_period	= 1,
+	.set_width	= ahc_linux_set_width,
+	.show_width	= 1,
+	.set_dt		= ahc_linux_set_dt,
+	.show_dt	= 1,
+#if 0
+	.set_iu		= ahc_linux_set_iu,
+	.show_iu	= 1,
+	.set_qas	= ahc_linux_set_qas,
+	.show_qas	= 1,
+#endif
+	.get_signalling	= ahc_linux_get_signalling,
+};
+
+
+
+static int __init
+ahc_linux_init(void)
+{
+	/*
+	 * If we've been passed any parameters, process them now.
+	 */
+	if (aic7xxx)
+		aic7xxx_setup(aic7xxx);
+
+	ahc_linux_transport_template =
+		spi_attach_transport(&ahc_linux_transport_functions);
+	if (!ahc_linux_transport_template)
+		return -ENODEV;
+
+	scsi_transport_reserve_device(ahc_linux_transport_template,
+				      sizeof(struct ahc_linux_device));
+
+	ahc_linux_pci_init();
+	ahc_linux_eisa_init();
+	return 0;
+}
+
+static void
+ahc_linux_exit(void)
+{
+	ahc_linux_pci_exit();
+	ahc_linux_eisa_exit();
+	spi_release_transport(ahc_linux_transport_template);
+}
+
+module_init(ahc_linux_init);
+module_exit(ahc_linux_exit);