OSCL-LXR linux-6.0.1/​drivers/​scsi/​aic7xxx/​aic79xx_osm.c	Source navigation Diff markup Identifier search General search
	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 /*
  * 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 const struct ahd_linux_iocell_opts aic79xx_iocell_info[] =
 {
     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);