kernel/drivers/scsi/aic7xxx/aic79xx_osm.c

   1 /*
   2  * Adaptec AIC79xx device driver for Linux.
   3  *
   4  * $Id: //depot/aic7xxx/linux/drivers/scsi/aic7xxx/aic79xx_osm.c#171 $
   5  *
   6  * --------------------------------------------------------------------------
   7  * Copyright (c) 1994-2000 Justin T. Gibbs.
   8  * Copyright (c) 1997-1999 Doug Ledford
   9  * Copyright (c) 2000-2003 Adaptec Inc.
  10  * All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions, and the following disclaimer,
  17  *    without modification.
  18  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  19  *    substantially similar to the "NO WARRANTY" disclaimer below
  20  *    ("Disclaimer") and any redistribution must be conditioned upon
  21  *    including a substantially similar Disclaimer requirement for further
  22  *    binary redistribution.
  23  * 3. Neither the names of the above-listed copyright holders nor the names
  24  *    of any contributors may be used to endorse or promote products derived
  25  *    from this software without specific prior written permission.
  26  *
  27  * Alternatively, this software may be distributed under the terms of the
  28  * GNU General Public License ("GPL") version 2 as published by the Free
  29  * Software Foundation.
  30  *
  31  * NO WARRANTY
  32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  35  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  36  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  37  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  38  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  39  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  40  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  41  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  42  * POSSIBILITY OF SUCH DAMAGES.
  43  */
  44
  45 #include "aic79xx_osm.h"
  46 #include "aic79xx_inline.h"
  47 #include <scsi/scsicam.h>
  48
  49 static struct scsi_transport_template *ahd_linux_transport_template = NULL;
  50
  51 #include <linux/init.h>         /* __setup */
  52 #include <linux/mm.h>           /* For fetching system memory size */
  53 #include <linux/blkdev.h>               /* For block_size() */
  54 #include <linux/delay.h>        /* For ssleep/msleep */
  55 #include <linux/device.h>
  56 #include <linux/slab.h>
  57
  58 /*
  59  * Bucket size for counting good commands in between bad ones.
  60  */
  61 #define AHD_LINUX_ERR_THRESH    1000
  62
  63 /*
  64  * Set this to the delay in seconds after SCSI bus reset.
  65  * Note, we honor this only for the initial bus reset.
  66  * The scsi error recovery code performs its own bus settle
  67  * delay handling for error recovery actions.
  68  */
  69 #ifdef CONFIG_AIC79XX_RESET_DELAY_MS
  70 #define AIC79XX_RESET_DELAY CONFIG_AIC79XX_RESET_DELAY_MS
  71 #else
  72 #define AIC79XX_RESET_DELAY 5000
  73 #endif
  74
  75 /*
  76  * To change the default number of tagged transactions allowed per-device,
  77  * add a line to the lilo.conf file like:
  78  * append="aic79xx=verbose,tag_info:{{32,32,32,32},{32,32,32,32}}"
  79  * which will result in the first four devices on the first two
  80  * controllers being set to a tagged queue depth of 32.
  81  *
  82  * The tag_commands is an array of 16 to allow for wide and twin adapters.
  83  * Twin adapters will use indexes 0-7 for channel 0, and indexes 8-15
  84  * for channel 1.
  85  */
  86 typedef struct {
  87         uint16_t tag_commands[16];      /* Allow for wide/twin adapters. */
  88 } adapter_tag_info_t;
  89
  90 /*
  91  * Modify this as you see fit for your system.
  92  *
  93  * 0                    tagged queuing disabled
  94  * 1 <= n <= 253        n == max tags ever dispatched.
  95  *
  96  * The driver will throttle the number of commands dispatched to a
  97  * device if it returns queue full.  For devices with a fixed maximum
  98  * queue depth, the driver will eventually determine this depth and
  99  * lock it in (a console message is printed to indicate that a lock
 100  * has occurred).  On some devices, queue full is returned for a temporary
 101  * resource shortage.  These devices will return queue full at varying
 102  * depths.  The driver will throttle back when the queue fulls occur and
 103  * attempt to slowly increase the depth over time as the device recovers
 104  * from the resource shortage.
 105  *
 106  * In this example, the first line will disable tagged queueing for all
 107  * the devices on the first probed aic79xx adapter.
 108  *
 109  * The second line enables tagged queueing with 4 commands/LUN for IDs
 110  * (0, 2-11, 13-15), disables tagged queueing for ID 12, and tells the
 111  * driver to attempt to use up to 64 tags for ID 1.
 112  *
 113  * The third line is the same as the first line.
 114  *
 115  * The fourth line disables tagged queueing for devices 0 and 3.  It
 116  * enables tagged queueing for the other IDs, with 16 commands/LUN
 117  * for IDs 1 and 4, 127 commands/LUN for ID 8, and 4 commands/LUN for
 118  * IDs 2, 5-7, and 9-15.
 119  */
 120
 121 /*
 122  * NOTE: The below structure is for reference only, the actual structure
 123  *       to modify in order to change things is just below this comment block.
 124 adapter_tag_info_t aic79xx_tag_info[] =
 125 {
 126         {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
 127         {{4, 64, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 0, 4, 4, 4}},
 128         {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
 129         {{0, 16, 4, 0, 16, 4, 4, 4, 127, 4, 4, 4, 4, 4, 4, 4}}
 130 };
 131 */
 132
 133 #ifdef CONFIG_AIC79XX_CMDS_PER_DEVICE
 134 #define AIC79XX_CMDS_PER_DEVICE CONFIG_AIC79XX_CMDS_PER_DEVICE
 135 #else
 136 #define AIC79XX_CMDS_PER_DEVICE AHD_MAX_QUEUE
 137 #endif
 138
 139 #define AIC79XX_CONFIGED_TAG_COMMANDS {                                 \
 140         AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,               \
 141         AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,               \
 142         AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,               \
 143         AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,               \
 144         AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,               \
 145         AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,               \
 146         AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,               \
 147         AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE                \
 148 }
 149
 150 /*
 151  * By default, use the number of commands specified by
 152  * the users kernel configuration.
 153  */
 154 static adapter_tag_info_t aic79xx_tag_info[] =
 155 {
 156         {AIC79XX_CONFIGED_TAG_COMMANDS},
 157         {AIC79XX_CONFIGED_TAG_COMMANDS},
 158         {AIC79XX_CONFIGED_TAG_COMMANDS},
 159         {AIC79XX_CONFIGED_TAG_COMMANDS},
 160         {AIC79XX_CONFIGED_TAG_COMMANDS},
 161         {AIC79XX_CONFIGED_TAG_COMMANDS},
 162         {AIC79XX_CONFIGED_TAG_COMMANDS},
 163         {AIC79XX_CONFIGED_TAG_COMMANDS},
 164         {AIC79XX_CONFIGED_TAG_COMMANDS},
 165         {AIC79XX_CONFIGED_TAG_COMMANDS},
 166         {AIC79XX_CONFIGED_TAG_COMMANDS},
 167         {AIC79XX_CONFIGED_TAG_COMMANDS},
 168         {AIC79XX_CONFIGED_TAG_COMMANDS},
 169         {AIC79XX_CONFIGED_TAG_COMMANDS},
 170         {AIC79XX_CONFIGED_TAG_COMMANDS},
 171         {AIC79XX_CONFIGED_TAG_COMMANDS}
 172 };
 173
 174 /*
 175  * The I/O cell on the chip is very configurable in respect to its analog
 176  * characteristics.  Set the defaults here; they can be overriden with
 177  * the proper insmod parameters.
 178  */
 179 struct ahd_linux_iocell_opts
 180 {
 181         uint8_t precomp;
 182         uint8_t slewrate;
 183         uint8_t amplitude;
 184 };
 185 #define AIC79XX_DEFAULT_PRECOMP         0xFF
 186 #define AIC79XX_DEFAULT_SLEWRATE        0xFF
 187 #define AIC79XX_DEFAULT_AMPLITUDE       0xFF
 188 #define AIC79XX_DEFAULT_IOOPTS                  \
 189 {                                               \
 190         AIC79XX_DEFAULT_PRECOMP,                \
 191         AIC79XX_DEFAULT_SLEWRATE,               \
 192         AIC79XX_DEFAULT_AMPLITUDE               \
 193 }
 194 #define AIC79XX_PRECOMP_INDEX   0
 195 #define AIC79XX_SLEWRATE_INDEX  1
 196 #define AIC79XX_AMPLITUDE_INDEX 2
 197 static const struct ahd_linux_iocell_opts aic79xx_iocell_info[] =
 198 {
 199         AIC79XX_DEFAULT_IOOPTS,
 200         AIC79XX_DEFAULT_IOOPTS,
 201         AIC79XX_DEFAULT_IOOPTS,
 202         AIC79XX_DEFAULT_IOOPTS,
 203         AIC79XX_DEFAULT_IOOPTS,
 204         AIC79XX_DEFAULT_IOOPTS,
 205         AIC79XX_DEFAULT_IOOPTS,
 206         AIC79XX_DEFAULT_IOOPTS,
 207         AIC79XX_DEFAULT_IOOPTS,
 208         AIC79XX_DEFAULT_IOOPTS,
 209         AIC79XX_DEFAULT_IOOPTS,
 210         AIC79XX_DEFAULT_IOOPTS,
 211         AIC79XX_DEFAULT_IOOPTS,
 212         AIC79XX_DEFAULT_IOOPTS,
 213         AIC79XX_DEFAULT_IOOPTS,
 214         AIC79XX_DEFAULT_IOOPTS
 215 };
 216
 217 /*
 218  * There should be a specific return value for this in scsi.h, but
 219  * it seems that most drivers ignore it.
 220  */
 221 #define DID_UNDERFLOW   DID_ERROR
 222
 223 void
 224 ahd_print_path(struct ahd_softc *ahd, struct scb *scb)
 225 {
 226         printk("(scsi%d:%c:%d:%d): ",
 227                ahd->platform_data->host->host_no,
 228                scb != NULL ? SCB_GET_CHANNEL(ahd, scb) : 'X',
 229                scb != NULL ? SCB_GET_TARGET(ahd, scb) : -1,
 230                scb != NULL ? SCB_GET_LUN(scb) : -1);
 231 }
 232
 233 /*
 234  * XXX - these options apply unilaterally to _all_ adapters
 235  *       cards in the system.  This should be fixed.  Exceptions to this
 236  *       rule are noted in the comments.
 237  */
 238
 239 /*
 240  * Skip the scsi bus reset.  Non 0 make us skip the reset at startup.  This
 241  * has no effect on any later resets that might occur due to things like
 242  * SCSI bus timeouts.
 243  */
 244 static uint32_t aic79xx_no_reset;
 245
 246 /*
 247  * Should we force EXTENDED translation on a controller.
 248  *     0 == Use whatever is in the SEEPROM or default to off
 249  *     1 == Use whatever is in the SEEPROM or default to on
 250  */
 251 static uint32_t aic79xx_extended;
 252
 253 /*
 254  * PCI bus parity checking of the Adaptec controllers.  This is somewhat
 255  * dubious at best.  To my knowledge, this option has never actually
 256  * solved a PCI parity problem, but on certain machines with broken PCI
 257  * chipset configurations, it can generate tons of false error messages.
 258  * It's included in the driver for completeness.
 259  *   0     = Shut off PCI parity check
 260  *   non-0 = Enable PCI parity check
 261  *
 262  * NOTE: you can't actually pass -1 on the lilo prompt.  So, to set this
 263  * variable to -1 you would actually want to simply pass the variable
 264  * name without a number.  That will invert the 0 which will result in
 265  * -1.
 266  */
 267 static uint32_t aic79xx_pci_parity = ~0;
 268
 269 /*
 270  * There are lots of broken chipsets in the world.  Some of them will
 271  * violate the PCI spec when we issue byte sized memory writes to our
 272  * controller.  I/O mapped register access, if allowed by the given
 273  * platform, will work in almost all cases.
 274  */
 275 uint32_t aic79xx_allow_memio = ~0;
 276
 277 /*
 278  * So that we can set how long each device is given as a selection timeout.
 279  * The table of values goes like this:
 280  *   0 - 256ms
 281  *   1 - 128ms
 282  *   2 - 64ms
 283  *   3 - 32ms
 284  * We default to 256ms because some older devices need a longer time
 285  * to respond to initial selection.
 286  */
 287 static uint32_t aic79xx_seltime;
 288
 289 /*
 290  * Certain devices do not perform any aging on commands.  Should the
 291  * device be saturated by commands in one portion of the disk, it is
 292  * possible for transactions on far away sectors to never be serviced.
 293  * To handle these devices, we can periodically send an ordered tag to
 294  * force all outstanding transactions to be serviced prior to a new
 295  * transaction.
 296  */
 297 static uint32_t aic79xx_periodic_otag;
 298
 299 /* Some storage boxes are using an LSI chip which has a bug making it
 300  * impossible to use aic79xx Rev B chip in 320 speeds.  The following
 301  * storage boxes have been reported to be buggy:
 302  * EonStor 3U 16-Bay: U16U-G3A3
 303  * EonStor 2U 12-Bay: U12U-G3A3
 304  * SentinelRAID: 2500F R5 / R6
 305  * SentinelRAID: 2500F R1
 306  * SentinelRAID: 2500F/1500F
 307  * SentinelRAID: 150F
 308  *
 309  * To get around this LSI bug, you can set your board to 160 mode
 310  * or you can enable the SLOWCRC bit.
 311  */
 312 uint32_t aic79xx_slowcrc;
 313
 314 /*
 315  * Module information and settable options.
 316  */
 317 static char *aic79xx = NULL;
 318
 319 MODULE_AUTHOR("Maintainer: Hannes Reinecke <hare@suse.de>");
 320 MODULE_DESCRIPTION("Adaptec AIC790X U320 SCSI Host Bus Adapter driver");
 321 MODULE_LICENSE("Dual BSD/GPL");
 322 MODULE_VERSION(AIC79XX_DRIVER_VERSION);
 323 module_param(aic79xx, charp, 0444);
 324 MODULE_PARM_DESC(aic79xx,
 325 "period-delimited options string:\n"
 326 "       verbose                 Enable verbose/diagnostic logging\n"
 327 "       allow_memio             Allow device registers to be memory mapped\n"
 328 "       debug                   Bitmask of debug values to enable\n"
 329 "       no_reset                Suppress initial bus resets\n"
 330 "       extended                Enable extended geometry on all controllers\n"
 331 "       periodic_otag           Send an ordered tagged transaction\n"
 332 "                               periodically to prevent tag starvation.\n"
 333 "                               This may be required by some older disk\n"
 334 "                               or drives/RAID arrays.\n"
 335 "       tag_info:<tag_str>      Set per-target tag depth\n"
 336 "       global_tag_depth:<int>  Global tag depth for all targets on all buses\n"
 337 "       slewrate:<slewrate_list>Set the signal slew rate (0-15).\n"
 338 "       precomp:<pcomp_list>    Set the signal precompensation (0-7).\n"
 339 "       amplitude:<int>         Set the signal amplitude (0-7).\n"
 340 "       seltime:<int>           Selection Timeout:\n"
 341 "                               (0/256ms,1/128ms,2/64ms,3/32ms)\n"
 342 "       slowcrc                 Turn on the SLOWCRC bit (Rev B only)\n"
 343 "\n"
 344 "       Sample modprobe configuration file:\n"
 345 "       #       Enable verbose logging\n"
 346 "       #       Set tag depth on Controller 2/Target 2 to 10 tags\n"
 347 "       #       Shorten the selection timeout to 128ms\n"
 348 "\n"
 349 "       options aic79xx 'aic79xx=verbose.tag_info:{{}.{}.{..10}}.seltime:1'\n"
 350 );
 351
 352 static void ahd_linux_handle_scsi_status(struct ahd_softc *,
 353                                          struct scsi_device *,
 354                                          struct scb *);
 355 static void ahd_linux_queue_cmd_complete(struct ahd_softc *ahd,
 356                                          struct scsi_cmnd *cmd);
 357 static int ahd_linux_queue_abort_cmd(struct scsi_cmnd *cmd);
 358 static void ahd_linux_initialize_scsi_bus(struct ahd_softc *ahd);
 359 static u_int ahd_linux_user_tagdepth(struct ahd_softc *ahd,
 360                                      struct ahd_devinfo *devinfo);
 361 static void ahd_linux_device_queue_depth(struct scsi_device *);
 362 static int ahd_linux_run_command(struct ahd_softc*,
 363                                  struct ahd_linux_device *,
 364                                  struct scsi_cmnd *);
 365 static void ahd_linux_setup_tag_info_global(char *p);
 366 static int  aic79xx_setup(char *c);
 367 static void ahd_freeze_simq(struct ahd_softc *ahd);
 368 static void ahd_release_simq(struct ahd_softc *ahd);
 369
 370 static int ahd_linux_unit;
 371
 372
 373 /************************** OS Utility Wrappers *******************************/
 374 void ahd_delay(long);
 375 void
 376 ahd_delay(long usec)
 377 {
 378         /*
 379          * udelay on Linux can have problems for
 380          * multi-millisecond waits.  Wait at most
 381          * 1024us per call.
 382          */
 383         while (usec > 0) {
 384                 udelay(usec % 1024);
 385                 usec -= 1024;
 386         }
 387 }
 388
 389
 390 /***************************** Low Level I/O **********************************/
 391 uint8_t ahd_inb(struct ahd_softc * ahd, long port);
 392 void ahd_outb(struct ahd_softc * ahd, long port, uint8_t val);
 393 void ahd_outw_atomic(struct ahd_softc * ahd,
 394                                      long port, uint16_t val);
 395 void ahd_outsb(struct ahd_softc * ahd, long port,
 396                                uint8_t *, int count);
 397 void ahd_insb(struct ahd_softc * ahd, long port,
 398                                uint8_t *, int count);
 399
 400 uint8_t
 401 ahd_inb(struct ahd_softc * ahd, long port)
 402 {
 403         uint8_t x;
 404
 405         if (ahd->tags[0] == BUS_SPACE_MEMIO) {
 406                 x = readb(ahd->bshs[0].maddr + port);
 407         } else {
 408                 x = inb(ahd->bshs[(port) >> 8].ioport + ((port) & 0xFF));
 409         }
 410         mb();
 411         return (x);
 412 }
 413
 414 #if 0 /* unused */
 415 static uint16_t
 416 ahd_inw_atomic(struct ahd_softc * ahd, long port)
 417 {
 418         uint8_t x;
 419
 420         if (ahd->tags[0] == BUS_SPACE_MEMIO) {
 421                 x = readw(ahd->bshs[0].maddr + port);
 422         } else {
 423                 x = inw(ahd->bshs[(port) >> 8].ioport + ((port) & 0xFF));
 424         }
 425         mb();
 426         return (x);
 427 }
 428 #endif
 429
 430 void
 431 ahd_outb(struct ahd_softc * ahd, long port, uint8_t val)
 432 {
 433         if (ahd->tags[0] == BUS_SPACE_MEMIO) {
 434                 writeb(val, ahd->bshs[0].maddr + port);
 435         } else {
 436                 outb(val, ahd->bshs[(port) >> 8].ioport + (port & 0xFF));
 437         }
 438         mb();
 439 }
 440
 441 void
 442 ahd_outw_atomic(struct ahd_softc * ahd, long port, uint16_t val)
 443 {
 444         if (ahd->tags[0] == BUS_SPACE_MEMIO) {
 445                 writew(val, ahd->bshs[0].maddr + port);
 446         } else {
 447                 outw(val, ahd->bshs[(port) >> 8].ioport + (port & 0xFF));
 448         }
 449         mb();
 450 }
 451
 452 void
 453 ahd_outsb(struct ahd_softc * ahd, long port, uint8_t *array, int count)
 454 {
 455         int i;
 456
 457         /*
 458          * There is probably a more efficient way to do this on Linux
 459          * but we don't use this for anything speed critical and this
 460          * should work.
 461          */
 462         for (i = 0; i < count; i++)
 463                 ahd_outb(ahd, port, *array++);
 464 }
 465
 466 void
 467 ahd_insb(struct ahd_softc * ahd, long port, uint8_t *array, int count)
 468 {
 469         int i;
 470
 471         /*
 472          * There is probably a more efficient way to do this on Linux
 473          * but we don't use this for anything speed critical and this
 474          * should work.
 475          */
 476         for (i = 0; i < count; i++)
 477                 *array++ = ahd_inb(ahd, port);
 478 }
 479
 480 /******************************* PCI Routines *********************************/
 481 uint32_t
 482 ahd_pci_read_config(ahd_dev_softc_t pci, int reg, int width)
 483 {
 484         switch (width) {
 485         case 1:
 486         {
 487                 uint8_t retval;
 488
 489                 pci_read_config_byte(pci, reg, &retval);
 490                 return (retval);
 491         }
 492         case 2:
 493         {
 494                 uint16_t retval;
 495                 pci_read_config_word(pci, reg, &retval);
 496                 return (retval);
 497         }
 498         case 4:
 499         {
 500                 uint32_t retval;
 501                 pci_read_config_dword(pci, reg, &retval);
 502                 return (retval);
 503         }
 504         default:
 505                 panic("ahd_pci_read_config: Read size too big");
 506                 /* NOTREACHED */
 507                 return (0);
 508         }
 509 }
 510
 511 void
 512 ahd_pci_write_config(ahd_dev_softc_t pci, int reg, uint32_t value, int width)
 513 {
 514         switch (width) {
 515         case 1:
 516                 pci_write_config_byte(pci, reg, value);
 517                 break;
 518         case 2:
 519                 pci_write_config_word(pci, reg, value);
 520                 break;
 521         case 4:
 522                 pci_write_config_dword(pci, reg, value);
 523                 break;
 524         default:
 525                 panic("ahd_pci_write_config: Write size too big");
 526                 /* NOTREACHED */
 527         }
 528 }
 529
 530 /****************************** Inlines ***************************************/
 531 static void ahd_linux_unmap_scb(struct ahd_softc*, struct scb*);
 532
 533 static void
 534 ahd_linux_unmap_scb(struct ahd_softc *ahd, struct scb *scb)
 535 {
 536         struct scsi_cmnd *cmd;
 537
 538         cmd = scb->io_ctx;
 539         ahd_sync_sglist(ahd, scb, BUS_DMASYNC_POSTWRITE);
 540         scsi_dma_unmap(cmd);
 541 }
 542
 543 /******************************** Macros **************************************/
 544 #define BUILD_SCSIID(ahd, cmd)                                          \
 545         (((scmd_id(cmd) << TID_SHIFT) & TID) | (ahd)->our_id)
 546
 547 /*
 548  * Return a string describing the driver.
 549  */
 550 static const char *
 551 ahd_linux_info(struct Scsi_Host *host)
 552 {
 553         static char buffer[512];
 554         char    ahd_info[256];
 555         char   *bp;
 556         struct ahd_softc *ahd;
 557
 558         bp = &buffer[0];
 559         ahd = *(struct ahd_softc **)host->hostdata;
 560         memset(bp, 0, sizeof(buffer));
 561         strcpy(bp, "Adaptec AIC79XX PCI-X SCSI HBA DRIVER, Rev " AIC79XX_DRIVER_VERSION "\n"
 562                         "        <");
 563         strcat(bp, ahd->description);
 564         strcat(bp, ">\n"
 565                         "        ");
 566         ahd_controller_info(ahd, ahd_info);
 567         strcat(bp, ahd_info);
 568
 569         return (bp);
 570 }
 571
 572 /*
 573  * Queue an SCB to the controller.
 574  */
 575 static int
 576 ahd_linux_queue_lck(struct scsi_cmnd * cmd, void (*scsi_done) (struct scsi_cmnd *))
 577 {
 578         struct   ahd_softc *ahd;
 579         struct   ahd_linux_device *dev = scsi_transport_device_data(cmd->device);
 580         int rtn = SCSI_MLQUEUE_HOST_BUSY;
 581
 582         ahd = *(struct ahd_softc **)cmd->device->host->hostdata;
 583
 584         cmd->scsi_done = scsi_done;
 585         cmd->result = CAM_REQ_INPROG << 16;
 586         rtn = ahd_linux_run_command(ahd, dev, cmd);
 587
 588         return rtn;
 589 }
 590
 591 static DEF_SCSI_QCMD(ahd_linux_queue)
 592
 593 static struct scsi_target **
 594 ahd_linux_target_in_softc(struct scsi_target *starget)
 595 {
 596         struct  ahd_softc *ahd =
 597                 *((struct ahd_softc **)dev_to_shost(&starget->dev)->hostdata);
 598         unsigned int target_offset;
 599
 600         target_offset = starget->id;
 601         if (starget->channel != 0)
 602                 target_offset += 8;
 603
 604         return &ahd->platform_data->starget[target_offset];
 605 }
 606
 607 static int
 608 ahd_linux_target_alloc(struct scsi_target *starget)
 609 {
 610         struct  ahd_softc *ahd =
 611                 *((struct ahd_softc **)dev_to_shost(&starget->dev)->hostdata);
 612         struct seeprom_config *sc = ahd->seep_config;
 613         unsigned long flags;
 614         struct scsi_target **ahd_targp = ahd_linux_target_in_softc(starget);
 615         struct ahd_devinfo devinfo;
 616         struct ahd_initiator_tinfo *tinfo;
 617         struct ahd_tmode_tstate *tstate;
 618         char channel = starget->channel + 'A';
 619
 620         ahd_lock(ahd, &flags);
 621
 622         BUG_ON(*ahd_targp != NULL);
 623
 624         *ahd_targp = starget;
 625
 626         if (sc) {
 627                 int flags = sc->device_flags[starget->id];
 628
 629                 tinfo = ahd_fetch_transinfo(ahd, 'A', ahd->our_id,
 630                                             starget->id, &tstate);
 631
 632                 if ((flags  & CFPACKETIZED) == 0) {
 633                         /* don't negotiate packetized (IU) transfers */
 634                         spi_max_iu(starget) = 0;
 635                 } else {
 636                         if ((ahd->features & AHD_RTI) == 0)
 637                                 spi_rti(starget) = 0;
 638                 }
 639
 640                 if ((flags & CFQAS) == 0)
 641                         spi_max_qas(starget) = 0;
 642
 643                 /* Transinfo values have been set to BIOS settings */
 644                 spi_max_width(starget) = (flags & CFWIDEB) ? 1 : 0;
 645                 spi_min_period(starget) = tinfo->user.period;
 646                 spi_max_offset(starget) = tinfo->user.offset;
 647         }
 648
 649         tinfo = ahd_fetch_transinfo(ahd, channel, ahd->our_id,
 650                                     starget->id, &tstate);
 651         ahd_compile_devinfo(&devinfo, ahd->our_id, starget->id,
 652                             CAM_LUN_WILDCARD, channel,
 653                             ROLE_INITIATOR);
 654         ahd_set_syncrate(ahd, &devinfo, 0, 0, 0,
 655                          AHD_TRANS_GOAL, /*paused*/FALSE);
 656         ahd_set_width(ahd, &devinfo, MSG_EXT_WDTR_BUS_8_BIT,
 657                       AHD_TRANS_GOAL, /*paused*/FALSE);
 658         ahd_unlock(ahd, &flags);
 659
 660         return 0;
 661 }
 662
 663 static void
 664 ahd_linux_target_destroy(struct scsi_target *starget)
 665 {
 666         struct scsi_target **ahd_targp = ahd_linux_target_in_softc(starget);
 667
 668         *ahd_targp = NULL;
 669 }
 670
 671 static int
 672 ahd_linux_slave_alloc(struct scsi_device *sdev)
 673 {
 674         struct  ahd_softc *ahd =
 675                 *((struct ahd_softc **)sdev->host->hostdata);
 676         struct ahd_linux_device *dev;
 677
 678         if (bootverbose)
 679                 printk("%s: Slave Alloc %d\n", ahd_name(ahd), sdev->id);
 680
 681         dev = scsi_transport_device_data(sdev);
 682         memset(dev, 0, sizeof(*dev));
 683
 684         /*
 685          * We start out life using untagged
 686          * transactions of which we allow one.
 687          */
 688         dev->openings = 1;
 689
 690         /*
 691          * Set maxtags to 0.  This will be changed if we
 692          * later determine that we are dealing with
 693          * a tagged queuing capable device.
 694          */
 695         dev->maxtags = 0;
 696
 697         return (0);
 698 }
 699
 700 static int
 701 ahd_linux_slave_configure(struct scsi_device *sdev)
 702 {
 703         struct  ahd_softc *ahd;
 704
 705         ahd = *((struct ahd_softc **)sdev->host->hostdata);
 706         if (bootverbose)
 707                 sdev_printk(KERN_INFO, sdev, "Slave Configure\n");
 708
 709         ahd_linux_device_queue_depth(sdev);
 710
 711         /* Initial Domain Validation */
 712         if (!spi_initial_dv(sdev->sdev_target))
 713                 spi_dv_device(sdev);
 714
 715         return 0;
 716 }
 717
 718 #if defined(__i386__)
 719 /*
 720  * Return the disk geometry for the given SCSI device.
 721  */
 722 static int
 723 ahd_linux_biosparam(struct scsi_device *sdev, struct block_device *bdev,
 724                     sector_t capacity, int geom[])
 725 {
 726         uint8_t *bh;
 727         int      heads;
 728         int      sectors;
 729         int      cylinders;
 730         int      ret;
 731         int      extended;
 732         struct   ahd_softc *ahd;
 733
 734         ahd = *((struct ahd_softc **)sdev->host->hostdata);
 735
 736         bh = scsi_bios_ptable(bdev);
 737         if (bh) {
 738                 ret = scsi_partsize(bh, capacity,
 739                                     &geom[2], &geom[0], &geom[1]);
 740                 kfree(bh);
 741                 if (ret != -1)
 742                         return (ret);
 743         }
 744         heads = 64;
 745         sectors = 32;
 746         cylinders = aic_sector_div(capacity, heads, sectors);
 747
 748         if (aic79xx_extended != 0)
 749                 extended = 1;
 750         else
 751                 extended = (ahd->flags & AHD_EXTENDED_TRANS_A) != 0;
 752         if (extended && cylinders >= 1024) {
 753                 heads = 255;
 754                 sectors = 63;
 755                 cylinders = aic_sector_div(capacity, heads, sectors);
 756         }
 757         geom[0] = heads;
 758         geom[1] = sectors;
 759         geom[2] = cylinders;
 760         return (0);
 761 }
 762 #endif
 763
 764 /*
 765  * Abort the current SCSI command(s).
 766  */
 767 static int
 768 ahd_linux_abort(struct scsi_cmnd *cmd)
 769 {
 770         int error;
 771
 772         error = ahd_linux_queue_abort_cmd(cmd);
 773
 774         return error;
 775 }
 776
 777 /*
 778  * Attempt to send a target reset message to the device that timed out.
 779  */
 780 static int
 781 ahd_linux_dev_reset(struct scsi_cmnd *cmd)
 782 {
 783         struct ahd_softc *ahd;
 784         struct ahd_linux_device *dev;
 785         struct scb *reset_scb;
 786         u_int  cdb_byte;
 787         int    retval = SUCCESS;
 788         int    paused;
 789         int    wait;
 790         struct  ahd_initiator_tinfo *tinfo;
 791         struct  ahd_tmode_tstate *tstate;
 792         unsigned long flags;
 793         DECLARE_COMPLETION_ONSTACK(done);
 794
 795         reset_scb = NULL;
 796         paused = FALSE;
 797         wait = FALSE;
 798         ahd = *(struct ahd_softc **)cmd->device->host->hostdata;
 799
 800         scmd_printk(KERN_INFO, cmd,
 801                     "Attempting to queue a TARGET RESET message:");
 802
 803         printk("CDB:");
 804         for (cdb_byte = 0; cdb_byte < cmd->cmd_len; cdb_byte++)
 805                 printk(" 0x%x", cmd->cmnd[cdb_byte]);
 806         printk("\n");
 807
 808         /*
 809          * Determine if we currently own this command.
 810          */
 811         dev = scsi_transport_device_data(cmd->device);
 812
 813         if (dev == NULL) {
 814                 /*
 815                  * No target device for this command exists,
 816                  * so we must not still own the command.
 817                  */
 818                 scmd_printk(KERN_INFO, cmd, "Is not an active device\n");
 819                 return SUCCESS;
 820         }
 821
 822         /*
 823          * Generate us a new SCB
 824          */
 825         reset_scb = ahd_get_scb(ahd, AHD_NEVER_COL_IDX);
 826         if (!reset_scb) {
 827                 scmd_printk(KERN_INFO, cmd, "No SCB available\n");
 828                 return FAILED;
 829         }
 830
 831         tinfo = ahd_fetch_transinfo(ahd, 'A', ahd->our_id,
 832                                     cmd->device->id, &tstate);
 833         reset_scb->io_ctx = cmd;
 834         reset_scb->platform_data->dev = dev;
 835         reset_scb->sg_count = 0;
 836         ahd_set_residual(reset_scb, 0);
 837         ahd_set_sense_residual(reset_scb, 0);
 838         reset_scb->platform_data->xfer_len = 0;
 839         reset_scb->hscb->control = 0;
 840         reset_scb->hscb->scsiid = BUILD_SCSIID(ahd,cmd);
 841         reset_scb->hscb->lun = cmd->device->lun;
 842         reset_scb->hscb->cdb_len = 0;
 843         reset_scb->hscb->task_management = SIU_TASKMGMT_LUN_RESET;
 844         reset_scb->flags |= SCB_DEVICE_RESET|SCB_RECOVERY_SCB|SCB_ACTIVE;
 845         if ((tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ) != 0) {
 846                 reset_scb->flags |= SCB_PACKETIZED;
 847         } else {
 848                 reset_scb->hscb->control |= MK_MESSAGE;
 849         }
 850         dev->openings--;
 851         dev->active++;
 852         dev->commands_issued++;
 853
 854         ahd_lock(ahd, &flags);
 855
 856         LIST_INSERT_HEAD(&ahd->pending_scbs, reset_scb, pending_links);
 857         ahd_queue_scb(ahd, reset_scb);
 858
 859         ahd->platform_data->eh_done = &done;
 860         ahd_unlock(ahd, &flags);
 861
 862         printk("%s: Device reset code sleeping\n", ahd_name(ahd));
 863         if (!wait_for_completion_timeout(&done, 5 * HZ)) {
 864                 ahd_lock(ahd, &flags);
 865                 ahd->platform_data->eh_done = NULL;
 866                 ahd_unlock(ahd, &flags);
 867                 printk("%s: Device reset timer expired (active %d)\n",
 868                        ahd_name(ahd), dev->active);
 869                 retval = FAILED;
 870         }
 871         printk("%s: Device reset returning 0x%x\n", ahd_name(ahd), retval);
 872
 873         return (retval);
 874 }
 875
 876 /*
 877  * Reset the SCSI bus.
 878  */
 879 static int
 880 ahd_linux_bus_reset(struct scsi_cmnd *cmd)
 881 {
 882         struct ahd_softc *ahd;
 883         int    found;
 884         unsigned long flags;
 885
 886         ahd = *(struct ahd_softc **)cmd->device->host->hostdata;
 887 #ifdef AHD_DEBUG
 888         if ((ahd_debug & AHD_SHOW_RECOVERY) != 0)
 889                 printk("%s: Bus reset called for cmd %p\n",
 890                        ahd_name(ahd), cmd);
 891 #endif
 892         ahd_lock(ahd, &flags);
 893
 894         found = ahd_reset_channel(ahd, scmd_channel(cmd) + 'A',
 895                                   /*initiate reset*/TRUE);
 896         ahd_unlock(ahd, &flags);
 897
 898         if (bootverbose)
 899                 printk("%s: SCSI bus reset delivered. "
 900                        "%d SCBs aborted.\n", ahd_name(ahd), found);
 901
 902         return (SUCCESS);
 903 }
 904
 905 struct scsi_host_template aic79xx_driver_template = {
 906         .module                 = THIS_MODULE,
 907         .name                   = "aic79xx",
 908         .proc_name              = "aic79xx",
 909         .show_info              = ahd_linux_show_info,
 910         .write_info             = ahd_proc_write_seeprom,
 911         .info                   = ahd_linux_info,
 912         .queuecommand           = ahd_linux_queue,
 913         .eh_abort_handler       = ahd_linux_abort,
 914         .eh_device_reset_handler = ahd_linux_dev_reset,
 915         .eh_bus_reset_handler   = ahd_linux_bus_reset,
 916 #if defined(__i386__)
 917         .bios_param             = ahd_linux_biosparam,
 918 #endif
 919         .can_queue              = AHD_MAX_QUEUE,
 920         .this_id                = -1,
 921         .max_sectors            = 8192,
 922         .cmd_per_lun            = 2,
 923         .use_clustering         = ENABLE_CLUSTERING,
 924         .slave_alloc            = ahd_linux_slave_alloc,
 925         .slave_configure        = ahd_linux_slave_configure,
 926         .target_alloc           = ahd_linux_target_alloc,
 927         .target_destroy         = ahd_linux_target_destroy,
 928 };
 929
 930 /******************************** Bus DMA *************************************/
 931 int
 932 ahd_dma_tag_create(struct ahd_softc *ahd, bus_dma_tag_t parent,
 933                    bus_size_t alignment, bus_size_t boundary,
 934                    dma_addr_t lowaddr, dma_addr_t highaddr,
 935                    bus_dma_filter_t *filter, void *filterarg,
 936                    bus_size_t maxsize, int nsegments,
 937                    bus_size_t maxsegsz, int flags, bus_dma_tag_t *ret_tag)
 938 {
 939         bus_dma_tag_t dmat;
 940
 941         dmat = kmalloc(sizeof(*dmat), GFP_ATOMIC);
 942         if (dmat == NULL)
 943                 return (ENOMEM);
 944
 945         /*
 946          * Linux is very simplistic about DMA memory.  For now don't
 947          * maintain all specification information.  Once Linux supplies
 948          * better facilities for doing these operations, or the
 949          * needs of this particular driver change, we might need to do
 950          * more here.
 951          */
 952         dmat->alignment = alignment;
 953         dmat->boundary = boundary;
 954         dmat->maxsize = maxsize;
 955         *ret_tag = dmat;
 956         return (0);
 957 }
 958
 959 void
 960 ahd_dma_tag_destroy(struct ahd_softc *ahd, bus_dma_tag_t dmat)
 961 {
 962         kfree(dmat);
 963 }
 964
 965 int
 966 ahd_dmamem_alloc(struct ahd_softc *ahd, bus_dma_tag_t dmat, void** vaddr,
 967                  int flags, bus_dmamap_t *mapp)
 968 {
 969         *vaddr = pci_alloc_consistent(ahd->dev_softc,
 970                                       dmat->maxsize, mapp);
 971         if (*vaddr == NULL)
 972                 return (ENOMEM);
 973         return(0);
 974 }
 975
 976 void
 977 ahd_dmamem_free(struct ahd_softc *ahd, bus_dma_tag_t dmat,
 978                 void* vaddr, bus_dmamap_t map)
 979 {
 980         pci_free_consistent(ahd->dev_softc, dmat->maxsize,
 981                             vaddr, map);
 982 }
 983
 984 int
 985 ahd_dmamap_load(struct ahd_softc *ahd, bus_dma_tag_t dmat, bus_dmamap_t map,
 986                 void *buf, bus_size_t buflen, bus_dmamap_callback_t *cb,
 987                 void *cb_arg, int flags)
 988 {
 989         /*
 990          * Assume for now that this will only be used during
 991          * initialization and not for per-transaction buffer mapping.
 992          */
 993         bus_dma_segment_t stack_sg;
 994
 995         stack_sg.ds_addr = map;
 996         stack_sg.ds_len = dmat->maxsize;
 997         cb(cb_arg, &stack_sg, /*nseg*/1, /*error*/0);
 998         return (0);
 999 }
1000
1001 void
1002 ahd_dmamap_destroy(struct ahd_softc *ahd, bus_dma_tag_t dmat, bus_dmamap_t map)
1003 {
1004 }
1005
1006 int
1007 ahd_dmamap_unload(struct ahd_softc *ahd, bus_dma_tag_t dmat, bus_dmamap_t map)
1008 {
1009         /* Nothing to do */
1010         return (0);
1011 }
1012
1013 /********************* Platform Dependent Functions ***************************/
1014 static void
1015 ahd_linux_setup_iocell_info(u_long index, int instance, int targ, int32_t value)
1016 {
1017
1018         if ((instance >= 0)
1019          && (instance < ARRAY_SIZE(aic79xx_iocell_info))) {
1020                 uint8_t *iocell_info;
1021
1022                 iocell_info = (uint8_t*)&aic79xx_iocell_info[instance];
1023                 iocell_info[index] = value & 0xFFFF;
1024                 if (bootverbose)
1025                         printk("iocell[%d:%ld] = %d\n", instance, index, value);
1026         }
1027 }
1028
1029 static void
1030 ahd_linux_setup_tag_info_global(char *p)
1031 {
1032         int tags, i, j;
1033
1034         tags = simple_strtoul(p + 1, NULL, 0) & 0xff;
1035         printk("Setting Global Tags= %d\n", tags);
1036
1037         for (i = 0; i < ARRAY_SIZE(aic79xx_tag_info); i++) {
1038                 for (j = 0; j < AHD_NUM_TARGETS; j++) {
1039                         aic79xx_tag_info[i].tag_commands[j] = tags;
1040                 }
1041         }
1042 }
1043
1044 static void
1045 ahd_linux_setup_tag_info(u_long arg, int instance, int targ, int32_t value)
1046 {
1047
1048         if ((instance >= 0) && (targ >= 0)
1049          && (instance < ARRAY_SIZE(aic79xx_tag_info))
1050          && (targ < AHD_NUM_TARGETS)) {
1051                 aic79xx_tag_info[instance].tag_commands[targ] = value & 0x1FF;
1052                 if (bootverbose)
1053                         printk("tag_info[%d:%d] = %d\n", instance, targ, value);
1054         }
1055 }
1056
1057 static char *
1058 ahd_parse_brace_option(char *opt_name, char *opt_arg, char *end, int depth,
1059                        void (*callback)(u_long, int, int, int32_t),
1060                        u_long callback_arg)
1061 {
1062         char    *tok_end;
1063         char    *tok_end2;
1064         int      i;
1065         int      instance;
1066         int      targ;
1067         int      done;
1068         char     tok_list[] = {'.', ',', '{', '}', '\0'};
1069
1070         /* All options use a ':' name/arg separator */
1071         if (*opt_arg != ':')
1072                 return (opt_arg);
1073         opt_arg++;
1074         instance = -1;
1075         targ = -1;
1076         done = FALSE;
1077         /*
1078          * Restore separator that may be in
1079          * the middle of our option argument.
1080          */
1081         tok_end = strchr(opt_arg, '\0');
1082         if (tok_end < end)
1083                 *tok_end = ',';
1084         while (!done) {
1085                 switch (*opt_arg) {
1086                 case '{':
1087                         if (instance == -1) {
1088                                 instance = 0;
1089                         } else {
1090                                 if (depth > 1) {
1091                                         if (targ == -1)
1092                                                 targ = 0;
1093                                 } else {
1094                                         printk("Malformed Option %s\n",
1095                                                opt_name);
1096                                         done = TRUE;
1097                                 }
1098                         }
1099                         opt_arg++;
1100                         break;
1101                 case '}':
1102                         if (targ != -1)
1103                                 targ = -1;
1104                         else if (instance != -1)
1105                                 instance = -1;
1106                         opt_arg++;
1107                         break;
1108                 case ',':
1109                 case '.':
1110                         if (instance == -1)
1111                                 done = TRUE;
1112                         else if (targ >= 0)
1113                                 targ++;
1114                         else if (instance >= 0)
1115                                 instance++;
1116                         opt_arg++;
1117                         break;
1118                 case '\0':
1119                         done = TRUE;
1120                         break;
1121                 default:
1122                         tok_end = end;
1123                         for (i = 0; tok_list[i]; i++) {
1124                                 tok_end2 = strchr(opt_arg, tok_list[i]);
1125                                 if ((tok_end2) && (tok_end2 < tok_end))
1126                                         tok_end = tok_end2;
1127                         }
1128                         callback(callback_arg, instance, targ,
1129                                  simple_strtol(opt_arg, NULL, 0));
1130                         opt_arg = tok_end;
1131                         break;
1132                 }
1133         }
1134         return (opt_arg);
1135 }
1136
1137 /*
1138  * Handle Linux boot parameters. This routine allows for assigning a value
1139  * to a parameter with a ':' between the parameter and the value.
1140  * ie. aic79xx=stpwlev:1,extended
1141  */
1142 static int
1143 aic79xx_setup(char *s)
1144 {
1145         int     i, n;
1146         char   *p;
1147         char   *end;
1148
1149         static const struct {
1150                 const char *name;
1151                 uint32_t *flag;
1152         } options[] = {
1153                 { "extended", &aic79xx_extended },
1154                 { "no_reset", &aic79xx_no_reset },
1155                 { "verbose", &aic79xx_verbose },
1156                 { "allow_memio", &aic79xx_allow_memio},
1157 #ifdef AHD_DEBUG
1158                 { "debug", &ahd_debug },
1159 #endif
1160                 { "periodic_otag", &aic79xx_periodic_otag },
1161                 { "pci_parity", &aic79xx_pci_parity },
1162                 { "seltime", &aic79xx_seltime },
1163                 { "tag_info", NULL },
1164                 { "global_tag_depth", NULL},
1165                 { "slewrate", NULL },
1166                 { "precomp", NULL },
1167                 { "amplitude", NULL },
1168                 { "slowcrc", &aic79xx_slowcrc },
1169         };
1170
1171         end = strchr(s, '\0');
1172
1173         /*
1174          * XXX ia64 gcc isn't smart enough to know that ARRAY_SIZE
1175          * will never be 0 in this case.
1176          */
1177         n = 0;
1178
1179         while ((p = strsep(&s, ",.")) != NULL) {
1180                 if (*p == '\0')
1181                         continue;
1182                 for (i = 0; i < ARRAY_SIZE(options); i++) {
1183
1184                         n = strlen(options[i].name);
1185                         if (strncmp(options[i].name, p, n) == 0)
1186                                 break;
1187                 }
1188                 if (i == ARRAY_SIZE(options))
1189                         continue;
1190
1191                 if (strncmp(p, "global_tag_depth", n) == 0) {
1192                         ahd_linux_setup_tag_info_global(p + n);
1193                 } else if (strncmp(p, "tag_info", n) == 0) {
1194                         s = ahd_parse_brace_option("tag_info", p + n, end,
1195                             2, ahd_linux_setup_tag_info, 0);
1196                 } else if (strncmp(p, "slewrate", n) == 0) {
1197                         s = ahd_parse_brace_option("slewrate",
1198                             p + n, end, 1, ahd_linux_setup_iocell_info,
1199                             AIC79XX_SLEWRATE_INDEX);
1200                 } else if (strncmp(p, "precomp", n) == 0) {
1201                         s = ahd_parse_brace_option("precomp",
1202                             p + n, end, 1, ahd_linux_setup_iocell_info,
1203                             AIC79XX_PRECOMP_INDEX);
1204                 } else if (strncmp(p, "amplitude", n) == 0) {
1205                         s = ahd_parse_brace_option("amplitude",
1206                             p + n, end, 1, ahd_linux_setup_iocell_info,
1207                             AIC79XX_AMPLITUDE_INDEX);
1208                 } else if (p[n] == ':') {
1209                         *(options[i].flag) = simple_strtoul(p + n + 1, NULL, 0);
1210                 } else if (!strncmp(p, "verbose", n)) {
1211                         *(options[i].flag) = 1;
1212                 } else {
1213                         *(options[i].flag) ^= 0xFFFFFFFF;
1214                 }
1215         }
1216         return 1;
1217 }
1218
1219 __setup("aic79xx=", aic79xx_setup);
1220
1221 uint32_t aic79xx_verbose;
1222
1223 int
1224 ahd_linux_register_host(struct ahd_softc *ahd, struct scsi_host_template *template)
1225 {
1226         char    buf[80];
1227         struct  Scsi_Host *host;
1228         char    *new_name;
1229         u_long  s;
1230         int     retval;
1231
1232         template->name = ahd->description;
1233         host = scsi_host_alloc(template, sizeof(struct ahd_softc *));
1234         if (host == NULL)
1235                 return (ENOMEM);
1236
1237         *((struct ahd_softc **)host->hostdata) = ahd;
1238         ahd->platform_data->host = host;
1239         host->can_queue = AHD_MAX_QUEUE;
1240         host->cmd_per_lun = 2;
1241         host->sg_tablesize = AHD_NSEG;
1242         host->this_id = ahd->our_id;
1243         host->irq = ahd->platform_data->irq;
1244         host->max_id = (ahd->features & AHD_WIDE) ? 16 : 8;
1245         host->max_lun = AHD_NUM_LUNS;
1246         host->max_channel = 0;
1247         host->sg_tablesize = AHD_NSEG;
1248         ahd_lock(ahd, &s);
1249         ahd_set_unit(ahd, ahd_linux_unit++);
1250         ahd_unlock(ahd, &s);
1251         sprintf(buf, "scsi%d", host->host_no);
1252         new_name = kmalloc(strlen(buf) + 1, GFP_ATOMIC);
1253         if (new_name != NULL) {
1254                 strcpy(new_name, buf);
1255                 ahd_set_name(ahd, new_name);
1256         }
1257         host->unique_id = ahd->unit;
1258         ahd_linux_initialize_scsi_bus(ahd);
1259         ahd_intr_enable(ahd, TRUE);
1260
1261         host->transportt = ahd_linux_transport_template;
1262
1263         retval = scsi_add_host(host, &ahd->dev_softc->dev);
1264         if (retval) {
1265                 printk(KERN_WARNING "aic79xx: scsi_add_host failed\n");
1266                 scsi_host_put(host);
1267                 return retval;
1268         }
1269
1270         scsi_scan_host(host);
1271         return 0;
1272 }
1273
1274 /*
1275  * Place the SCSI bus into a known state by either resetting it,
1276  * or forcing transfer negotiations on the next command to any
1277  * target.
1278  */
1279 static void
1280 ahd_linux_initialize_scsi_bus(struct ahd_softc *ahd)
1281 {
1282         u_int target_id;
1283         u_int numtarg;
1284         unsigned long s;
1285
1286         target_id = 0;
1287         numtarg = 0;
1288
1289         if (aic79xx_no_reset != 0)
1290                 ahd->flags &= ~AHD_RESET_BUS_A;
1291
1292         if ((ahd->flags & AHD_RESET_BUS_A) != 0)
1293                 ahd_reset_channel(ahd, 'A', /*initiate_reset*/TRUE);
1294         else
1295                 numtarg = (ahd->features & AHD_WIDE) ? 16 : 8;
1296
1297         ahd_lock(ahd, &s);
1298
1299         /*
1300          * Force negotiation to async for all targets that
1301          * will not see an initial bus reset.
1302          */
1303         for (; target_id < numtarg; target_id++) {
1304                 struct ahd_devinfo devinfo;
1305                 struct ahd_initiator_tinfo *tinfo;
1306                 struct ahd_tmode_tstate *tstate;
1307
1308                 tinfo = ahd_fetch_transinfo(ahd, 'A', ahd->our_id,
1309                                             target_id, &tstate);
1310                 ahd_compile_devinfo(&devinfo, ahd->our_id, target_id,
1311                                     CAM_LUN_WILDCARD, 'A', ROLE_INITIATOR);
1312                 ahd_update_neg_request(ahd, &devinfo, tstate,
1313                                        tinfo, AHD_NEG_ALWAYS);
1314         }
1315         ahd_unlock(ahd, &s);
1316         /* Give the bus some time to recover */
1317         if ((ahd->flags & AHD_RESET_BUS_A) != 0) {
1318                 ahd_freeze_simq(ahd);
1319                 msleep(AIC79XX_RESET_DELAY);
1320                 ahd_release_simq(ahd);
1321         }
1322 }
1323
1324 int
1325 ahd_platform_alloc(struct ahd_softc *ahd, void *platform_arg)
1326 {
1327         ahd->platform_data =
1328             kzalloc(sizeof(struct ahd_platform_data), GFP_ATOMIC);
1329         if (ahd->platform_data == NULL)
1330                 return (ENOMEM);
1331         ahd->platform_data->irq = AHD_LINUX_NOIRQ;
1332         ahd_lockinit(ahd);
1333         ahd->seltime = (aic79xx_seltime & 0x3) << 4;
1334         return (0);
1335 }
1336
1337 void
1338 ahd_platform_free(struct ahd_softc *ahd)
1339 {
1340         struct scsi_target *starget;
1341         int i;
1342
1343         if (ahd->platform_data != NULL) {
1344                 /* destroy all of the device and target objects */
1345                 for (i = 0; i < AHD_NUM_TARGETS; i++) {
1346                         starget = ahd->platform_data->starget[i];
1347                         if (starget != NULL) {
1348                                 ahd->platform_data->starget[i] = NULL;
1349                         }
1350                 }
1351
1352                 if (ahd->platform_data->irq != AHD_LINUX_NOIRQ)
1353                         free_irq(ahd->platform_data->irq, ahd);
1354                 if (ahd->tags[0] == BUS_SPACE_PIO
1355                  && ahd->bshs[0].ioport != 0)
1356                         release_region(ahd->bshs[0].ioport, 256);
1357                 if (ahd->tags[1] == BUS_SPACE_PIO
1358                  && ahd->bshs[1].ioport != 0)
1359                         release_region(ahd->bshs[1].ioport, 256);
1360                 if (ahd->tags[0] == BUS_SPACE_MEMIO
1361                  && ahd->bshs[0].maddr != NULL) {
1362                         iounmap(ahd->bshs[0].maddr);
1363                         release_mem_region(ahd->platform_data->mem_busaddr,
1364                                            0x1000);
1365                 }
1366                 if (ahd->platform_data->host)
1367                         scsi_host_put(ahd->platform_data->host);
1368
1369                 kfree(ahd->platform_data);
1370         }
1371 }
1372
1373 void
1374 ahd_platform_init(struct ahd_softc *ahd)
1375 {
1376         /*
1377          * Lookup and commit any modified IO Cell options.
1378          */
1379         if (ahd->unit < ARRAY_SIZE(aic79xx_iocell_info)) {
1380                 const struct ahd_linux_iocell_opts *iocell_opts;
1381
1382                 iocell_opts = &aic79xx_iocell_info[ahd->unit];
1383                 if (iocell_opts->precomp != AIC79XX_DEFAULT_PRECOMP)
1384                         AHD_SET_PRECOMP(ahd, iocell_opts->precomp);
1385                 if (iocell_opts->slewrate != AIC79XX_DEFAULT_SLEWRATE)
1386                         AHD_SET_SLEWRATE(ahd, iocell_opts->slewrate);
1387                 if (iocell_opts->amplitude != AIC79XX_DEFAULT_AMPLITUDE)
1388                         AHD_SET_AMPLITUDE(ahd, iocell_opts->amplitude);
1389         }
1390
1391 }
1392
1393 void
1394 ahd_platform_freeze_devq(struct ahd_softc *ahd, struct scb *scb)
1395 {
1396         ahd_platform_abort_scbs(ahd, SCB_GET_TARGET(ahd, scb),
1397                                 SCB_GET_CHANNEL(ahd, scb),
1398                                 SCB_GET_LUN(scb), SCB_LIST_NULL,
1399                                 ROLE_UNKNOWN, CAM_REQUEUE_REQ);
1400 }
1401
1402 void
1403 ahd_platform_set_tags(struct ahd_softc *ahd, struct scsi_device *sdev,
1404                       struct ahd_devinfo *devinfo, ahd_queue_alg alg)
1405 {
1406         struct ahd_linux_device *dev;
1407         int was_queuing;
1408         int now_queuing;
1409
1410         if (sdev == NULL)
1411                 return;
1412
1413         dev = scsi_transport_device_data(sdev);
1414
1415         if (dev == NULL)
1416                 return;
1417         was_queuing = dev->flags & (AHD_DEV_Q_BASIC|AHD_DEV_Q_TAGGED);
1418         switch (alg) {
1419         default:
1420         case AHD_QUEUE_NONE:
1421                 now_queuing = 0;
1422                 break;
1423         case AHD_QUEUE_BASIC:
1424                 now_queuing = AHD_DEV_Q_BASIC;
1425                 break;
1426         case AHD_QUEUE_TAGGED:
1427                 now_queuing = AHD_DEV_Q_TAGGED;
1428                 break;
1429         }
1430         if ((dev->flags & AHD_DEV_FREEZE_TIL_EMPTY) == 0
1431          && (was_queuing != now_queuing)
1432          && (dev->active != 0)) {
1433                 dev->flags |= AHD_DEV_FREEZE_TIL_EMPTY;
1434                 dev->qfrozen++;
1435         }
1436
1437         dev->flags &= ~(AHD_DEV_Q_BASIC|AHD_DEV_Q_TAGGED|AHD_DEV_PERIODIC_OTAG);
1438         if (now_queuing) {
1439                 u_int usertags;
1440
1441                 usertags = ahd_linux_user_tagdepth(ahd, devinfo);
1442                 if (!was_queuing) {
1443                         /*
1444                          * Start out aggressively and allow our
1445                          * dynamic queue depth algorithm to take
1446                          * care of the rest.
1447                          */
1448                         dev->maxtags = usertags;
1449                         dev->openings = dev->maxtags - dev->active;
1450                 }
1451                 if (dev->maxtags == 0) {
1452                         /*
1453                          * Queueing is disabled by the user.
1454                          */
1455                         dev->openings = 1;
1456                 } else if (alg == AHD_QUEUE_TAGGED) {
1457                         dev->flags |= AHD_DEV_Q_TAGGED;
1458                         if (aic79xx_periodic_otag != 0)
1459                                 dev->flags |= AHD_DEV_PERIODIC_OTAG;
1460                 } else
1461                         dev->flags |= AHD_DEV_Q_BASIC;
1462         } else {
1463                 /* We can only have one opening. */
1464                 dev->maxtags = 0;
1465                 dev->openings =  1 - dev->active;
1466         }
1467
1468         switch ((dev->flags & (AHD_DEV_Q_BASIC|AHD_DEV_Q_TAGGED))) {
1469         case AHD_DEV_Q_BASIC:
1470         case AHD_DEV_Q_TAGGED:
1471                 scsi_change_queue_depth(sdev,
1472                                 dev->openings + dev->active);
1473                 break;
1474         default:
1475                 /*
1476                  * We allow the OS to queue 2 untagged transactions to
1477                  * us at any time even though we can only execute them
1478                  * serially on the controller/device.  This should
1479                  * remove some latency.
1480                  */
1481                 scsi_change_queue_depth(sdev, 1);
1482                 break;
1483         }
1484 }
1485
1486 int
1487 ahd_platform_abort_scbs(struct ahd_softc *ahd, int target, char channel,
1488                         int lun, u_int tag, role_t role, uint32_t status)
1489 {
1490         return 0;
1491 }
1492
1493 static u_int
1494 ahd_linux_user_tagdepth(struct ahd_softc *ahd, struct ahd_devinfo *devinfo)
1495 {
1496         static int warned_user;
1497         u_int tags;
1498
1499         tags = 0;
1500         if ((ahd->user_discenable & devinfo->target_mask) != 0) {
1501                 if (ahd->unit >= ARRAY_SIZE(aic79xx_tag_info)) {
1502
1503                         if (warned_user == 0) {
1504                                 printk(KERN_WARNING
1505 "aic79xx: WARNING: Insufficient tag_info instances\n"
1506 "aic79xx: for installed controllers.  Using defaults\n"
1507 "aic79xx: Please update the aic79xx_tag_info array in\n"
1508 "aic79xx: the aic79xx_osm.c source file.\n");
1509                                 warned_user++;
1510                         }
1511                         tags = AHD_MAX_QUEUE;
1512                 } else {
1513                         adapter_tag_info_t *tag_info;
1514
1515                         tag_info = &aic79xx_tag_info[ahd->unit];
1516                         tags = tag_info->tag_commands[devinfo->target_offset];
1517                         if (tags > AHD_MAX_QUEUE)
1518                                 tags = AHD_MAX_QUEUE;
1519                 }
1520         }
1521         return (tags);
1522 }
1523
1524 /*
1525  * Determines the queue depth for a given device.
1526  */
1527 static void
1528 ahd_linux_device_queue_depth(struct scsi_device *sdev)
1529 {
1530         struct  ahd_devinfo devinfo;
1531         u_int   tags;
1532         struct ahd_softc *ahd = *((struct ahd_softc **)sdev->host->hostdata);
1533
1534         ahd_compile_devinfo(&devinfo,
1535                             ahd->our_id,
1536                             sdev->sdev_target->id, sdev->lun,
1537                             sdev->sdev_target->channel == 0 ? 'A' : 'B',
1538                             ROLE_INITIATOR);
1539         tags = ahd_linux_user_tagdepth(ahd, &devinfo);
1540         if (tags != 0 && sdev->tagged_supported != 0) {
1541
1542                 ahd_platform_set_tags(ahd, sdev, &devinfo, AHD_QUEUE_TAGGED);
1543                 ahd_send_async(ahd, devinfo.channel, devinfo.target,
1544                                devinfo.lun, AC_TRANSFER_NEG);
1545                 ahd_print_devinfo(ahd, &devinfo);
1546                 printk("Tagged Queuing enabled.  Depth %d\n", tags);
1547         } else {
1548                 ahd_platform_set_tags(ahd, sdev, &devinfo, AHD_QUEUE_NONE);
1549                 ahd_send_async(ahd, devinfo.channel, devinfo.target,
1550                                devinfo.lun, AC_TRANSFER_NEG);
1551         }
1552 }
1553
1554 static int
1555 ahd_linux_run_command(struct ahd_softc *ahd, struct ahd_linux_device *dev,
1556                       struct scsi_cmnd *cmd)
1557 {
1558         struct   scb *scb;
1559         struct   hardware_scb *hscb;
1560         struct   ahd_initiator_tinfo *tinfo;
1561         struct   ahd_tmode_tstate *tstate;
1562         u_int    col_idx;
1563         uint16_t mask;
1564         unsigned long flags;
1565         int nseg;
1566
1567         nseg = scsi_dma_map(cmd);
1568         if (nseg < 0)
1569                 return SCSI_MLQUEUE_HOST_BUSY;
1570
1571         ahd_lock(ahd, &flags);
1572
1573         /*
1574          * Get an scb to use.
1575          */
1576         tinfo = ahd_fetch_transinfo(ahd, 'A', ahd->our_id,
1577                                     cmd->device->id, &tstate);
1578         if ((dev->flags & (AHD_DEV_Q_TAGGED|AHD_DEV_Q_BASIC)) == 0
1579          || (tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ) != 0) {
1580                 col_idx = AHD_NEVER_COL_IDX;
1581         } else {
1582                 col_idx = AHD_BUILD_COL_IDX(cmd->device->id,
1583                                             cmd->device->lun);
1584         }
1585         if ((scb = ahd_get_scb(ahd, col_idx)) == NULL) {
1586                 ahd->flags |= AHD_RESOURCE_SHORTAGE;
1587                 ahd_unlock(ahd, &flags);
1588                 scsi_dma_unmap(cmd);
1589                 return SCSI_MLQUEUE_HOST_BUSY;
1590         }
1591
1592         scb->io_ctx = cmd;
1593         scb->platform_data->dev = dev;
1594         hscb = scb->hscb;
1595         cmd->host_scribble = (char *)scb;
1596
1597         /*
1598          * Fill out basics of the HSCB.
1599          */
1600         hscb->control = 0;
1601         hscb->scsiid = BUILD_SCSIID(ahd, cmd);
1602         hscb->lun = cmd->device->lun;
1603         scb->hscb->task_management = 0;
1604         mask = SCB_GET_TARGET_MASK(ahd, scb);
1605
1606         if ((ahd->user_discenable & mask) != 0)
1607                 hscb->control |= DISCENB;
1608
1609         if ((tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ) != 0)
1610                 scb->flags |= SCB_PACKETIZED;
1611
1612         if ((tstate->auto_negotiate & mask) != 0) {
1613                 scb->flags |= SCB_AUTO_NEGOTIATE;
1614                 scb->hscb->control |= MK_MESSAGE;
1615         }
1616
1617         if ((dev->flags & (AHD_DEV_Q_TAGGED|AHD_DEV_Q_BASIC)) != 0) {
1618                 if (dev->commands_since_idle_or_otag == AHD_OTAG_THRESH
1619                  && (dev->flags & AHD_DEV_Q_TAGGED) != 0) {
1620                         hscb->control |= MSG_ORDERED_TASK;
1621                         dev->commands_since_idle_or_otag = 0;
1622                 } else {
1623                         hscb->control |= MSG_SIMPLE_TASK;
1624                 }
1625         }
1626
1627         hscb->cdb_len = cmd->cmd_len;
1628         memcpy(hscb->shared_data.idata.cdb, cmd->cmnd, hscb->cdb_len);
1629
1630         scb->platform_data->xfer_len = 0;
1631         ahd_set_residual(scb, 0);
1632         ahd_set_sense_residual(scb, 0);
1633         scb->sg_count = 0;
1634
1635         if (nseg > 0) {
1636                 void *sg = scb->sg_list;
1637                 struct scatterlist *cur_seg;
1638                 int i;
1639
1640                 scb->platform_data->xfer_len = 0;
1641
1642                 scsi_for_each_sg(cmd, cur_seg, nseg, i) {
1643                         dma_addr_t addr;
1644                         bus_size_t len;
1645
1646                         addr = sg_dma_address(cur_seg);
1647                         len = sg_dma_len(cur_seg);
1648                         scb->platform_data->xfer_len += len;
1649                         sg = ahd_sg_setup(ahd, scb, sg, addr, len,
1650                                           i == (nseg - 1));
1651                 }
1652         }
1653
1654         LIST_INSERT_HEAD(&ahd->pending_scbs, scb, pending_links);
1655         dev->openings--;
1656         dev->active++;
1657         dev->commands_issued++;
1658
1659         if ((dev->flags & AHD_DEV_PERIODIC_OTAG) != 0)
1660                 dev->commands_since_idle_or_otag++;
1661         scb->flags |= SCB_ACTIVE;
1662         ahd_queue_scb(ahd, scb);
1663
1664         ahd_unlock(ahd, &flags);
1665
1666         return 0;
1667 }
1668
1669 /*
1670  * SCSI controller interrupt handler.
1671  */
1672 irqreturn_t
1673 ahd_linux_isr(int irq, void *dev_id)
1674 {
1675         struct  ahd_softc *ahd;
1676         u_long  flags;
1677         int     ours;
1678
1679         ahd = (struct ahd_softc *) dev_id;
1680         ahd_lock(ahd, &flags);
1681         ours = ahd_intr(ahd);
1682         ahd_unlock(ahd, &flags);
1683         return IRQ_RETVAL(ours);
1684 }
1685
1686 void
1687 ahd_send_async(struct ahd_softc *ahd, char channel,
1688                u_int target, u_int lun, ac_code code)
1689 {
1690         switch (code) {
1691         case AC_TRANSFER_NEG:
1692         {
1693                 struct  scsi_target *starget;
1694                 struct  ahd_initiator_tinfo *tinfo;
1695                 struct  ahd_tmode_tstate *tstate;
1696                 unsigned int target_ppr_options;
1697
1698                 BUG_ON(target == CAM_TARGET_WILDCARD);
1699
1700                 tinfo = ahd_fetch_transinfo(ahd, channel, ahd->our_id,
1701                                             target, &tstate);
1702
1703                 /*
1704                  * Don't bother reporting results while
1705                  * negotiations are still pending.
1706                  */
1707                 if (tinfo->curr.period != tinfo->goal.period
1708                  || tinfo->curr.width != tinfo->goal.width
1709                  || tinfo->curr.offset != tinfo->goal.offset
1710                  || tinfo->curr.ppr_options != tinfo->goal.ppr_options)
1711                         if (bootverbose == 0)
1712                                 break;
1713
1714                 /*
1715                  * Don't bother reporting results that
1716                  * are identical to those last reported.
1717                  */
1718                 starget = ahd->platform_data->starget[target];
1719                 if (starget == NULL)
1720                         break;
1721
1722                 target_ppr_options =
1723                         (spi_dt(starget) ? MSG_EXT_PPR_DT_REQ : 0)
1724                         + (spi_qas(starget) ? MSG_EXT_PPR_QAS_REQ : 0)
1725                         + (spi_iu(starget) ?  MSG_EXT_PPR_IU_REQ : 0)
1726                         + (spi_rd_strm(starget) ? MSG_EXT_PPR_RD_STRM : 0)
1727                         + (spi_pcomp_en(starget) ? MSG_EXT_PPR_PCOMP_EN : 0)
1728                         + (spi_rti(starget) ? MSG_EXT_PPR_RTI : 0)
1729                         + (spi_wr_flow(starget) ? MSG_EXT_PPR_WR_FLOW : 0)
1730                         + (spi_hold_mcs(starget) ? MSG_EXT_PPR_HOLD_MCS : 0);
1731
1732                 if (tinfo->curr.period == spi_period(starget)
1733                     && tinfo->curr.width == spi_width(starget)
1734                     && tinfo->curr.offset == spi_offset(starget)
1735                  && tinfo->curr.ppr_options == target_ppr_options)
1736                         if (bootverbose == 0)
1737                                 break;
1738
1739                 spi_period(starget) = tinfo->curr.period;
1740                 spi_width(starget) = tinfo->curr.width;
1741                 spi_offset(starget) = tinfo->curr.offset;
1742                 spi_dt(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_DT_REQ ? 1 : 0;
1743                 spi_qas(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_QAS_REQ ? 1 : 0;
1744                 spi_iu(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ ? 1 : 0;
1745                 spi_rd_strm(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_RD_STRM ? 1 : 0;
1746                 spi_pcomp_en(starget) =  tinfo->curr.ppr_options & MSG_EXT_PPR_PCOMP_EN ? 1 : 0;
1747                 spi_rti(starget) =  tinfo->curr.ppr_options &  MSG_EXT_PPR_RTI ? 1 : 0;
1748                 spi_wr_flow(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_WR_FLOW ? 1 : 0;
1749                 spi_hold_mcs(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_HOLD_MCS ? 1 : 0;
1750                 spi_display_xfer_agreement(starget);
1751                 break;
1752         }
1753         case AC_SENT_BDR:
1754         {
1755                 WARN_ON(lun != CAM_LUN_WILDCARD);
1756                 scsi_report_device_reset(ahd->platform_data->host,
1757                                          channel - 'A', target);
1758                 break;
1759         }
1760         case AC_BUS_RESET:
1761                 if (ahd->platform_data->host != NULL) {
1762                         scsi_report_bus_reset(ahd->platform_data->host,
1763                                               channel - 'A');
1764                 }
1765                 break;
1766         default:
1767                 panic("ahd_send_async: Unexpected async event");
1768         }
1769 }
1770
1771 /*
1772  * Calls the higher level scsi done function and frees the scb.
1773  */
1774 void
1775 ahd_done(struct ahd_softc *ahd, struct scb *scb)
1776 {
1777         struct scsi_cmnd *cmd;
1778         struct    ahd_linux_device *dev;
1779
1780         if ((scb->flags & SCB_ACTIVE) == 0) {
1781                 printk("SCB %d done'd twice\n", SCB_GET_TAG(scb));
1782                 ahd_dump_card_state(ahd);
1783                 panic("Stopping for safety");
1784         }
1785         LIST_REMOVE(scb, pending_links);
1786         cmd = scb->io_ctx;
1787         dev = scb->platform_data->dev;
1788         dev->active--;
1789         dev->openings++;
1790         if ((cmd->result & (CAM_DEV_QFRZN << 16)) != 0) {
1791                 cmd->result &= ~(CAM_DEV_QFRZN << 16);
1792                 dev->qfrozen--;
1793         }
1794         ahd_linux_unmap_scb(ahd, scb);
1795
1796         /*
1797          * Guard against stale sense data.
1798          * The Linux mid-layer assumes that sense
1799          * was retrieved anytime the first byte of
1800          * the sense buffer looks "sane".
1801          */
1802         cmd->sense_buffer[0] = 0;
1803         if (ahd_get_transaction_status(scb) == CAM_REQ_INPROG) {
1804                 uint32_t amount_xferred;
1805
1806                 amount_xferred =
1807                     ahd_get_transfer_length(scb) - ahd_get_residual(scb);
1808                 if ((scb->flags & SCB_TRANSMISSION_ERROR) != 0) {
1809 #ifdef AHD_DEBUG
1810                         if ((ahd_debug & AHD_SHOW_MISC) != 0) {
1811                                 ahd_print_path(ahd, scb);
1812                                 printk("Set CAM_UNCOR_PARITY\n");
1813                         }
1814 #endif
1815                         ahd_set_transaction_status(scb, CAM_UNCOR_PARITY);
1816 #ifdef AHD_REPORT_UNDERFLOWS
1817                 /*
1818                  * This code is disabled by default as some
1819                  * clients of the SCSI system do not properly
1820                  * initialize the underflow parameter.  This
1821                  * results in spurious termination of commands
1822                  * that complete as expected (e.g. underflow is
1823                  * allowed as command can return variable amounts
1824                  * of data.
1825                  */
1826                 } else if (amount_xferred < scb->io_ctx->underflow) {
1827                         u_int i;
1828
1829                         ahd_print_path(ahd, scb);
1830                         printk("CDB:");
1831                         for (i = 0; i < scb->io_ctx->cmd_len; i++)
1832                                 printk(" 0x%x", scb->io_ctx->cmnd[i]);
1833                         printk("\n");
1834                         ahd_print_path(ahd, scb);
1835                         printk("Saw underflow (%ld of %ld bytes). "
1836                                "Treated as error\n",
1837                                 ahd_get_residual(scb),
1838                                 ahd_get_transfer_length(scb));
1839                         ahd_set_transaction_status(scb, CAM_DATA_RUN_ERR);
1840 #endif
1841                 } else {
1842                         ahd_set_transaction_status(scb, CAM_REQ_CMP);
1843                 }
1844         } else if (ahd_get_transaction_status(scb) == CAM_SCSI_STATUS_ERROR) {
1845                 ahd_linux_handle_scsi_status(ahd, cmd->device, scb);
1846         }
1847
1848         if (dev->openings == 1
1849          && ahd_get_transaction_status(scb) == CAM_REQ_CMP
1850          && ahd_get_scsi_status(scb) != SCSI_STATUS_QUEUE_FULL)
1851                 dev->tag_success_count++;
1852         /*
1853          * Some devices deal with temporary internal resource
1854          * shortages by returning queue full.  When the queue
1855          * full occurrs, we throttle back.  Slowly try to get
1856          * back to our previous queue depth.
1857          */
1858         if ((dev->openings + dev->active) < dev->maxtags
1859          && dev->tag_success_count > AHD_TAG_SUCCESS_INTERVAL) {
1860                 dev->tag_success_count = 0;
1861                 dev->openings++;
1862         }
1863
1864         if (dev->active == 0)
1865                 dev->commands_since_idle_or_otag = 0;
1866
1867         if ((scb->flags & SCB_RECOVERY_SCB) != 0) {
1868                 printk("Recovery SCB completes\n");
1869                 if (ahd_get_transaction_status(scb) == CAM_BDR_SENT
1870                  || ahd_get_transaction_status(scb) == CAM_REQ_ABORTED)
1871                         ahd_set_transaction_status(scb, CAM_CMD_TIMEOUT);
1872
1873                 if (ahd->platform_data->eh_done)
1874                         complete(ahd->platform_data->eh_done);
1875         }
1876
1877         ahd_free_scb(ahd, scb);
1878         ahd_linux_queue_cmd_complete(ahd, cmd);
1879 }
1880
1881 static void
1882 ahd_linux_handle_scsi_status(struct ahd_softc *ahd,
1883                              struct scsi_device *sdev, struct scb *scb)
1884 {
1885         struct  ahd_devinfo devinfo;
1886         struct ahd_linux_device *dev = scsi_transport_device_data(sdev);
1887
1888         ahd_compile_devinfo(&devinfo,
1889                             ahd->our_id,
1890                             sdev->sdev_target->id, sdev->lun,
1891                             sdev->sdev_target->channel == 0 ? 'A' : 'B',
1892                             ROLE_INITIATOR);
1893
1894         /*
1895          * We don't currently trust the mid-layer to
1896          * properly deal with queue full or busy.  So,
1897          * when one occurs, we tell the mid-layer to
1898          * unconditionally requeue the command to us
1899          * so that we can retry it ourselves.  We also
1900          * implement our own throttling mechanism so
1901          * we don't clobber the device with too many
1902          * commands.
1903          */
1904         switch (ahd_get_scsi_status(scb)) {
1905         default:
1906                 break;
1907         case SCSI_STATUS_CHECK_COND:
1908         case SCSI_STATUS_CMD_TERMINATED:
1909         {
1910                 struct scsi_cmnd *cmd;
1911
1912                 /*
1913                  * Copy sense information to the OS's cmd
1914                  * structure if it is available.
1915                  */
1916                 cmd = scb->io_ctx;
1917                 if ((scb->flags & (SCB_SENSE|SCB_PKT_SENSE)) != 0) {
1918                         struct scsi_status_iu_header *siu;
1919                         u_int sense_size;
1920                         u_int sense_offset;
1921
1922                         if (scb->flags & SCB_SENSE) {
1923                                 sense_size = min(sizeof(struct scsi_sense_data)
1924                                                - ahd_get_sense_residual(scb),
1925                                                  (u_long)SCSI_SENSE_BUFFERSIZE);
1926                                 sense_offset = 0;
1927                         } else {
1928                                 /*
1929                                  * Copy only the sense data into the provided
1930                                  * buffer.
1931                                  */
1932                                 siu = (struct scsi_status_iu_header *)
1933                                     scb->sense_data;
1934                                 sense_size = min_t(size_t,
1935                                                 scsi_4btoul(siu->sense_length),
1936                                                 SCSI_SENSE_BUFFERSIZE);
1937                                 sense_offset = SIU_SENSE_OFFSET(siu);
1938                         }
1939
1940                         memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1941                         memcpy(cmd->sense_buffer,
1942                                ahd_get_sense_buf(ahd, scb)
1943                                + sense_offset, sense_size);
1944                         cmd->result |= (DRIVER_SENSE << 24);
1945
1946 #ifdef AHD_DEBUG
1947                         if (ahd_debug & AHD_SHOW_SENSE) {
1948                                 int i;
1949
1950                                 printk("Copied %d bytes of sense data at %d:",
1951                                        sense_size, sense_offset);
1952                                 for (i = 0; i < sense_size; i++) {
1953                                         if ((i & 0xF) == 0)
1954                                                 printk("\n");
1955                                         printk("0x%x ", cmd->sense_buffer[i]);
1956                                 }
1957                                 printk("\n");
1958                         }
1959 #endif
1960                 }
1961                 break;
1962         }
1963         case SCSI_STATUS_QUEUE_FULL:
1964                 /*
1965                  * By the time the core driver has returned this
1966                  * command, all other commands that were queued
1967                  * to us but not the device have been returned.
1968                  * This ensures that dev->active is equal to
1969                  * the number of commands actually queued to
1970                  * the device.
1971                  */
1972                 dev->tag_success_count = 0;
1973                 if (dev->active != 0) {
1974                         /*
1975                          * Drop our opening count to the number
1976                          * of commands currently outstanding.
1977                          */
1978                         dev->openings = 0;
1979 #ifdef AHD_DEBUG
1980                         if ((ahd_debug & AHD_SHOW_QFULL) != 0) {
1981                                 ahd_print_path(ahd, scb);
1982                                 printk("Dropping tag count to %d\n",
1983                                        dev->active);
1984                         }
1985 #endif
1986                         if (dev->active == dev->tags_on_last_queuefull) {
1987
1988                                 dev->last_queuefull_same_count++;
1989                                 /*
1990                                  * If we repeatedly see a queue full
1991                                  * at the same queue depth, this
1992                                  * device has a fixed number of tag
1993                                  * slots.  Lock in this tag depth
1994                                  * so we stop seeing queue fulls from
1995                                  * this device.
1996                                  */
1997                                 if (dev->last_queuefull_same_count
1998                                  == AHD_LOCK_TAGS_COUNT) {
1999                                         dev->maxtags = dev->active;
2000                                         ahd_print_path(ahd, scb);
2001                                         printk("Locking max tag count at %d\n",
2002                                                dev->active);
2003                                 }
2004                         } else {
2005                                 dev->tags_on_last_queuefull = dev->active;
2006                                 dev->last_queuefull_same_count = 0;
2007                         }
2008                         ahd_set_transaction_status(scb, CAM_REQUEUE_REQ);
2009                         ahd_set_scsi_status(scb, SCSI_STATUS_OK);
2010                         ahd_platform_set_tags(ahd, sdev, &devinfo,
2011                                      (dev->flags & AHD_DEV_Q_BASIC)
2012                                    ? AHD_QUEUE_BASIC : AHD_QUEUE_TAGGED);
2013                         break;
2014                 }
2015                 /*
2016                  * Drop down to a single opening, and treat this
2017                  * as if the target returned BUSY SCSI status.
2018                  */
2019                 dev->openings = 1;
2020                 ahd_platform_set_tags(ahd, sdev, &devinfo,
2021                              (dev->flags & AHD_DEV_Q_BASIC)
2022                            ? AHD_QUEUE_BASIC : AHD_QUEUE_TAGGED);
2023                 ahd_set_scsi_status(scb, SCSI_STATUS_BUSY);
2024         }
2025 }
2026
2027 static void
2028 ahd_linux_queue_cmd_complete(struct ahd_softc *ahd, struct scsi_cmnd *cmd)
2029 {
2030         int status;
2031         int new_status = DID_OK;
2032         int do_fallback = 0;
2033         int scsi_status;
2034
2035         /*
2036          * Map CAM error codes into Linux Error codes.  We
2037          * avoid the conversion so that the DV code has the
2038          * full error information available when making
2039          * state change decisions.
2040          */
2041
2042         status = ahd_cmd_get_transaction_status(cmd);
2043         switch (status) {
2044         case CAM_REQ_INPROG:
2045         case CAM_REQ_CMP:
2046                 new_status = DID_OK;
2047                 break;
2048         case CAM_AUTOSENSE_FAIL:
2049                 new_status = DID_ERROR;
2050                 /* Fallthrough */
2051         case CAM_SCSI_STATUS_ERROR:
2052                 scsi_status = ahd_cmd_get_scsi_status(cmd);
2053
2054                 switch(scsi_status) {
2055                 case SCSI_STATUS_CMD_TERMINATED:
2056                 case SCSI_STATUS_CHECK_COND:
2057                         if ((cmd->result >> 24) != DRIVER_SENSE) {
2058                                 do_fallback = 1;
2059                         } else {
2060                                 struct scsi_sense_data *sense;
2061
2062                                 sense = (struct scsi_sense_data *)
2063                                         cmd->sense_buffer;
2064                                 if (sense->extra_len >= 5 &&
2065                                     (sense->add_sense_code == 0x47
2066                                      || sense->add_sense_code == 0x48))
2067                                         do_fallback = 1;
2068                         }
2069                         break;
2070                 default:
2071                         break;
2072                 }
2073                 break;
2074         case CAM_REQ_ABORTED:
2075                 new_status = DID_ABORT;
2076                 break;
2077         case CAM_BUSY:
2078                 new_status = DID_BUS_BUSY;
2079                 break;
2080         case CAM_REQ_INVALID:
2081         case CAM_PATH_INVALID:
2082                 new_status = DID_BAD_TARGET;
2083                 break;
2084         case CAM_SEL_TIMEOUT:
2085                 new_status = DID_NO_CONNECT;
2086                 break;
2087         case CAM_SCSI_BUS_RESET:
2088         case CAM_BDR_SENT:
2089                 new_status = DID_RESET;
2090                 break;
2091         case CAM_UNCOR_PARITY:
2092                 new_status = DID_PARITY;
2093                 do_fallback = 1;
2094                 break;
2095         case CAM_CMD_TIMEOUT:
2096                 new_status = DID_TIME_OUT;
2097                 do_fallback = 1;
2098                 break;
2099         case CAM_REQ_CMP_ERR:
2100         case CAM_UNEXP_BUSFREE:
2101         case CAM_DATA_RUN_ERR:
2102                 new_status = DID_ERROR;
2103                 do_fallback = 1;
2104                 break;
2105         case CAM_UA_ABORT:
2106         case CAM_NO_HBA:
2107         case CAM_SEQUENCE_FAIL:
2108         case CAM_CCB_LEN_ERR:
2109         case CAM_PROVIDE_FAIL:
2110         case CAM_REQ_TERMIO:
2111         case CAM_UNREC_HBA_ERROR:
2112         case CAM_REQ_TOO_BIG:
2113                 new_status = DID_ERROR;
2114                 break;
2115         case CAM_REQUEUE_REQ:
2116                 new_status = DID_REQUEUE;
2117                 break;
2118         default:
2119                 /* We should never get here */
2120                 new_status = DID_ERROR;
2121                 break;
2122         }
2123
2124         if (do_fallback) {
2125                 printk("%s: device overrun (status %x) on %d:%d:%d\n",
2126                        ahd_name(ahd), status, cmd->device->channel,
2127                        cmd->device->id, (u8)cmd->device->lun);
2128         }
2129
2130         ahd_cmd_set_transaction_status(cmd, new_status);
2131
2132         cmd->scsi_done(cmd);
2133 }
2134
2135 static void
2136 ahd_freeze_simq(struct ahd_softc *ahd)
2137 {
2138         scsi_block_requests(ahd->platform_data->host);
2139 }
2140
2141 static void
2142 ahd_release_simq(struct ahd_softc *ahd)
2143 {
2144         scsi_unblock_requests(ahd->platform_data->host);
2145 }
2146
2147 static int
2148 ahd_linux_queue_abort_cmd(struct scsi_cmnd *cmd)
2149 {
2150         struct ahd_softc *ahd;
2151         struct ahd_linux_device *dev;
2152         struct scb *pending_scb;
2153         u_int  saved_scbptr;
2154         u_int  active_scbptr;
2155         u_int  last_phase;
2156         u_int  saved_scsiid;
2157         u_int  cdb_byte;
2158         int    retval;
2159         int    was_paused;
2160         int    paused;
2161         int    wait;
2162         int    disconnected;
2163         ahd_mode_state saved_modes;
2164         unsigned long flags;
2165
2166         pending_scb = NULL;
2167         paused = FALSE;
2168         wait = FALSE;
2169         ahd = *(struct ahd_softc **)cmd->device->host->hostdata;
2170
2171         scmd_printk(KERN_INFO, cmd,
2172                     "Attempting to queue an ABORT message:");
2173
2174         printk("CDB:");
2175         for (cdb_byte = 0; cdb_byte < cmd->cmd_len; cdb_byte++)
2176                 printk(" 0x%x", cmd->cmnd[cdb_byte]);
2177         printk("\n");
2178
2179         ahd_lock(ahd, &flags);
2180
2181         /*
2182          * First determine if we currently own this command.
2183          * Start by searching the device queue.  If not found
2184          * there, check the pending_scb list.  If not found
2185          * at all, and the system wanted us to just abort the
2186          * command, return success.
2187          */
2188         dev = scsi_transport_device_data(cmd->device);
2189
2190         if (dev == NULL) {
2191                 /*
2192                  * No target device for this command exists,
2193                  * so we must not still own the command.
2194                  */
2195                 scmd_printk(KERN_INFO, cmd, "Is not an active device\n");
2196                 retval = SUCCESS;
2197                 goto no_cmd;
2198         }
2199
2200         /*
2201          * See if we can find a matching cmd in the pending list.
2202          */
2203         LIST_FOREACH(pending_scb, &ahd->pending_scbs, pending_links) {
2204                 if (pending_scb->io_ctx == cmd)
2205                         break;
2206         }
2207
2208         if (pending_scb == NULL) {
2209                 scmd_printk(KERN_INFO, cmd, "Command not found\n");
2210                 goto no_cmd;
2211         }
2212
2213         if ((pending_scb->flags & SCB_RECOVERY_SCB) != 0) {
2214                 /*
2215                  * We can't queue two recovery actions using the same SCB
2216                  */
2217                 retval = FAILED;
2218                 goto  done;
2219         }
2220
2221         /*
2222          * Ensure that the card doesn't do anything
2223          * behind our back.  Also make sure that we
2224          * didn't "just" miss an interrupt that would
2225          * affect this cmd.
2226          */
2227         was_paused = ahd_is_paused(ahd);
2228         ahd_pause_and_flushwork(ahd);
2229         paused = TRUE;
2230
2231         if ((pending_scb->flags & SCB_ACTIVE) == 0) {
2232                 scmd_printk(KERN_INFO, cmd, "Command already completed\n");
2233                 goto no_cmd;
2234         }
2235
2236         printk("%s: At time of recovery, card was %spaused\n",
2237                ahd_name(ahd), was_paused ? "" : "not ");
2238         ahd_dump_card_state(ahd);
2239
2240         disconnected = TRUE;
2241         if (ahd_search_qinfifo(ahd, cmd->device->id,
2242                                cmd->device->channel + 'A',
2243                                cmd->device->lun,
2244                                pending_scb->hscb->tag,
2245                                ROLE_INITIATOR, CAM_REQ_ABORTED,
2246                                SEARCH_COMPLETE) > 0) {
2247                 printk("%s:%d:%d:%d: Cmd aborted from QINFIFO\n",
2248                        ahd_name(ahd), cmd->device->channel,
2249                        cmd->device->id, (u8)cmd->device->lun);
2250                 retval = SUCCESS;
2251                 goto done;
2252         }
2253
2254         saved_modes = ahd_save_modes(ahd);
2255         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
2256         last_phase = ahd_inb(ahd, LASTPHASE);
2257         saved_scbptr = ahd_get_scbptr(ahd);
2258         active_scbptr = saved_scbptr;
2259         if (disconnected && (ahd_inb(ahd, SEQ_FLAGS) & NOT_IDENTIFIED) == 0) {
2260                 struct scb *bus_scb;
2261
2262                 bus_scb = ahd_lookup_scb(ahd, active_scbptr);
2263                 if (bus_scb == pending_scb)
2264                         disconnected = FALSE;
2265         }
2266
2267         /*
2268          * At this point, pending_scb is the scb associated with the
2269          * passed in command.  That command is currently active on the
2270          * bus or is in the disconnected state.
2271          */
2272         saved_scsiid = ahd_inb(ahd, SAVED_SCSIID);
2273         if (last_phase != P_BUSFREE
2274             && SCB_GET_TAG(pending_scb) == active_scbptr) {
2275
2276                 /*
2277                  * We're active on the bus, so assert ATN
2278                  * and hope that the target responds.
2279                  */
2280                 pending_scb = ahd_lookup_scb(ahd, active_scbptr);
2281                 pending_scb->flags |= SCB_RECOVERY_SCB|SCB_ABORT;
2282                 ahd_outb(ahd, MSG_OUT, HOST_MSG);
2283                 ahd_outb(ahd, SCSISIGO, last_phase|ATNO);
2284                 scmd_printk(KERN_INFO, cmd, "Device is active, asserting ATN\n");
2285                 wait = TRUE;
2286         } else if (disconnected) {
2287
2288                 /*
2289                  * Actually re-queue this SCB in an attempt
2290                  * to select the device before it reconnects.
2291                  */
2292                 pending_scb->flags |= SCB_RECOVERY_SCB|SCB_ABORT;
2293                 ahd_set_scbptr(ahd, SCB_GET_TAG(pending_scb));
2294                 pending_scb->hscb->cdb_len = 0;
2295                 pending_scb->hscb->task_attribute = 0;
2296                 pending_scb->hscb->task_management = SIU_TASKMGMT_ABORT_TASK;
2297
2298                 if ((pending_scb->flags & SCB_PACKETIZED) != 0) {
2299                         /*
2300                          * Mark the SCB has having an outstanding
2301                          * task management function.  Should the command
2302                          * complete normally before the task management
2303                          * function can be sent, the host will be notified
2304                          * to abort our requeued SCB.
2305                          */
2306                         ahd_outb(ahd, SCB_TASK_MANAGEMENT,
2307                                  pending_scb->hscb->task_management);
2308                 } else {
2309                         /*
2310                          * If non-packetized, set the MK_MESSAGE control
2311                          * bit indicating that we desire to send a message.
2312                          * We also set the disconnected flag since there is
2313                          * no guarantee that our SCB control byte matches
2314                          * the version on the card.  We don't want the
2315                          * sequencer to abort the command thinking an
2316                          * unsolicited reselection occurred.
2317                          */
2318                         pending_scb->hscb->control |= MK_MESSAGE|DISCONNECTED;
2319
2320                         /*
2321                          * The sequencer will never re-reference the
2322                          * in-core SCB.  To make sure we are notified
2323                          * during reselection, set the MK_MESSAGE flag in
2324                          * the card's copy of the SCB.
2325                          */
2326                         ahd_outb(ahd, SCB_CONTROL,
2327                                  ahd_inb(ahd, SCB_CONTROL)|MK_MESSAGE);
2328                 }
2329
2330                 /*
2331                  * Clear out any entries in the QINFIFO first
2332                  * so we are the next SCB for this target
2333                  * to run.
2334                  */
2335                 ahd_search_qinfifo(ahd, cmd->device->id,
2336                                    cmd->device->channel + 'A', cmd->device->lun,
2337                                    SCB_LIST_NULL, ROLE_INITIATOR,
2338                                    CAM_REQUEUE_REQ, SEARCH_COMPLETE);
2339                 ahd_qinfifo_requeue_tail(ahd, pending_scb);
2340                 ahd_set_scbptr(ahd, saved_scbptr);
2341                 ahd_print_path(ahd, pending_scb);
2342                 printk("Device is disconnected, re-queuing SCB\n");
2343                 wait = TRUE;
2344         } else {
2345                 scmd_printk(KERN_INFO, cmd, "Unable to deliver message\n");
2346                 retval = FAILED;
2347                 goto done;
2348         }
2349
2350 no_cmd:
2351         /*
2352          * Our assumption is that if we don't have the command, no
2353          * recovery action was required, so we return success.  Again,
2354          * the semantics of the mid-layer recovery engine are not
2355          * well defined, so this may change in time.
2356          */
2357         retval = SUCCESS;
2358 done:
2359         if (paused)
2360                 ahd_unpause(ahd);
2361         if (wait) {
2362                 DECLARE_COMPLETION_ONSTACK(done);
2363
2364                 ahd->platform_data->eh_done = &done;
2365                 ahd_unlock(ahd, &flags);
2366
2367                 printk("%s: Recovery code sleeping\n", ahd_name(ahd));
2368                 if (!wait_for_completion_timeout(&done, 5 * HZ)) {
2369                         ahd_lock(ahd, &flags);
2370                         ahd->platform_data->eh_done = NULL;
2371                         ahd_unlock(ahd, &flags);
2372                         printk("%s: Timer Expired (active %d)\n",
2373                                ahd_name(ahd), dev->active);
2374                         retval = FAILED;
2375                 }
2376                 printk("Recovery code awake\n");
2377         } else
2378                 ahd_unlock(ahd, &flags);
2379
2380         if (retval != SUCCESS)
2381                 printk("%s: Command abort returning 0x%x\n",
2382                        ahd_name(ahd), retval);
2383
2384         return retval;
2385 }
2386
2387 static void ahd_linux_set_width(struct scsi_target *starget, int width)
2388 {
2389         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2390         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2391         struct ahd_devinfo devinfo;
2392         unsigned long flags;
2393
2394         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2395                             starget->channel + 'A', ROLE_INITIATOR);
2396         ahd_lock(ahd, &flags);
2397         ahd_set_width(ahd, &devinfo, width, AHD_TRANS_GOAL, FALSE);
2398         ahd_unlock(ahd, &flags);
2399 }
2400
2401 static void ahd_linux_set_period(struct scsi_target *starget, int period)
2402 {
2403         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2404         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2405         struct ahd_tmode_tstate *tstate;
2406         struct ahd_initiator_tinfo *tinfo
2407                 = ahd_fetch_transinfo(ahd,
2408                                       starget->channel + 'A',
2409                                       shost->this_id, starget->id, &tstate);
2410         struct ahd_devinfo devinfo;
2411         unsigned int ppr_options = tinfo->goal.ppr_options;
2412         unsigned int dt;
2413         unsigned long flags;
2414         unsigned long offset = tinfo->goal.offset;
2415
2416 #ifdef AHD_DEBUG
2417         if ((ahd_debug & AHD_SHOW_DV) != 0)
2418                 printk("%s: set period to %d\n", ahd_name(ahd), period);
2419 #endif
2420         if (offset == 0)
2421                 offset = MAX_OFFSET;
2422
2423         if (period < 8)
2424                 period = 8;
2425         if (period < 10) {
2426                 if (spi_max_width(starget)) {
2427                         ppr_options |= MSG_EXT_PPR_DT_REQ;
2428                         if (period == 8)
2429                                 ppr_options |= MSG_EXT_PPR_IU_REQ;
2430                 } else
2431                         period = 10;
2432         }
2433
2434         dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2435
2436         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2437                             starget->channel + 'A', ROLE_INITIATOR);
2438
2439         /* all PPR requests apart from QAS require wide transfers */
2440         if (ppr_options & ~MSG_EXT_PPR_QAS_REQ) {
2441                 if (spi_width(starget) == 0)
2442                         ppr_options &= MSG_EXT_PPR_QAS_REQ;
2443         }
2444
2445         ahd_find_syncrate(ahd, &period, &ppr_options,
2446                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2447
2448         ahd_lock(ahd, &flags);
2449         ahd_set_syncrate(ahd, &devinfo, period, offset,
2450                          ppr_options, AHD_TRANS_GOAL, FALSE);
2451         ahd_unlock(ahd, &flags);
2452 }
2453
2454 static void ahd_linux_set_offset(struct scsi_target *starget, int offset)
2455 {
2456         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2457         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2458         struct ahd_tmode_tstate *tstate;
2459         struct ahd_initiator_tinfo *tinfo
2460                 = ahd_fetch_transinfo(ahd,
2461                                       starget->channel + 'A',
2462                                       shost->this_id, starget->id, &tstate);
2463         struct ahd_devinfo devinfo;
2464         unsigned int ppr_options = 0;
2465         unsigned int period = 0;
2466         unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2467         unsigned long flags;
2468
2469 #ifdef AHD_DEBUG
2470         if ((ahd_debug & AHD_SHOW_DV) != 0)
2471                 printk("%s: set offset to %d\n", ahd_name(ahd), offset);
2472 #endif
2473
2474         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2475                             starget->channel + 'A', ROLE_INITIATOR);
2476         if (offset != 0) {
2477                 period = tinfo->goal.period;
2478                 ppr_options = tinfo->goal.ppr_options;
2479                 ahd_find_syncrate(ahd, &period, &ppr_options,
2480                                   dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2481         }
2482
2483         ahd_lock(ahd, &flags);
2484         ahd_set_syncrate(ahd, &devinfo, period, offset, ppr_options,
2485                          AHD_TRANS_GOAL, FALSE);
2486         ahd_unlock(ahd, &flags);
2487 }
2488
2489 static void ahd_linux_set_dt(struct scsi_target *starget, int dt)
2490 {
2491         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2492         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2493         struct ahd_tmode_tstate *tstate;
2494         struct ahd_initiator_tinfo *tinfo
2495                 = ahd_fetch_transinfo(ahd,
2496                                       starget->channel + 'A',
2497                                       shost->this_id, starget->id, &tstate);
2498         struct ahd_devinfo devinfo;
2499         unsigned int ppr_options = tinfo->goal.ppr_options
2500                 & ~MSG_EXT_PPR_DT_REQ;
2501         unsigned int period = tinfo->goal.period;
2502         unsigned int width = tinfo->goal.width;
2503         unsigned long flags;
2504
2505 #ifdef AHD_DEBUG
2506         if ((ahd_debug & AHD_SHOW_DV) != 0)
2507                 printk("%s: %s DT\n", ahd_name(ahd),
2508                        dt ? "enabling" : "disabling");
2509 #endif
2510         if (dt && spi_max_width(starget)) {
2511                 ppr_options |= MSG_EXT_PPR_DT_REQ;
2512                 if (!width)
2513                         ahd_linux_set_width(starget, 1);
2514         } else {
2515                 if (period <= 9)
2516                         period = 10; /* If resetting DT, period must be >= 25ns */
2517                 /* IU is invalid without DT set */
2518                 ppr_options &= ~MSG_EXT_PPR_IU_REQ;
2519         }
2520         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2521                             starget->channel + 'A', ROLE_INITIATOR);
2522         ahd_find_syncrate(ahd, &period, &ppr_options,
2523                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2524
2525         ahd_lock(ahd, &flags);
2526         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2527                          ppr_options, AHD_TRANS_GOAL, FALSE);
2528         ahd_unlock(ahd, &flags);
2529 }
2530
2531 static void ahd_linux_set_qas(struct scsi_target *starget, int qas)
2532 {
2533         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2534         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2535         struct ahd_tmode_tstate *tstate;
2536         struct ahd_initiator_tinfo *tinfo
2537                 = ahd_fetch_transinfo(ahd,
2538                                       starget->channel + 'A',
2539                                       shost->this_id, starget->id, &tstate);
2540         struct ahd_devinfo devinfo;
2541         unsigned int ppr_options = tinfo->goal.ppr_options
2542                 & ~MSG_EXT_PPR_QAS_REQ;
2543         unsigned int period = tinfo->goal.period;
2544         unsigned int dt;
2545         unsigned long flags;
2546
2547 #ifdef AHD_DEBUG
2548         if ((ahd_debug & AHD_SHOW_DV) != 0)
2549                 printk("%s: %s QAS\n", ahd_name(ahd),
2550                        qas ? "enabling" : "disabling");
2551 #endif
2552
2553         if (qas) {
2554                 ppr_options |= MSG_EXT_PPR_QAS_REQ;
2555         }
2556
2557         dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2558
2559         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2560                             starget->channel + 'A', ROLE_INITIATOR);
2561         ahd_find_syncrate(ahd, &period, &ppr_options,
2562                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2563
2564         ahd_lock(ahd, &flags);
2565         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2566                          ppr_options, AHD_TRANS_GOAL, FALSE);
2567         ahd_unlock(ahd, &flags);
2568 }
2569
2570 static void ahd_linux_set_iu(struct scsi_target *starget, int iu)
2571 {
2572         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2573         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2574         struct ahd_tmode_tstate *tstate;
2575         struct ahd_initiator_tinfo *tinfo
2576                 = ahd_fetch_transinfo(ahd,
2577                                       starget->channel + 'A',
2578                                       shost->this_id, starget->id, &tstate);
2579         struct ahd_devinfo devinfo;
2580         unsigned int ppr_options = tinfo->goal.ppr_options
2581                 & ~MSG_EXT_PPR_IU_REQ;
2582         unsigned int period = tinfo->goal.period;
2583         unsigned int dt;
2584         unsigned long flags;
2585
2586 #ifdef AHD_DEBUG
2587         if ((ahd_debug & AHD_SHOW_DV) != 0)
2588                 printk("%s: %s IU\n", ahd_name(ahd),
2589                        iu ? "enabling" : "disabling");
2590 #endif
2591
2592         if (iu && spi_max_width(starget)) {
2593                 ppr_options |= MSG_EXT_PPR_IU_REQ;
2594                 ppr_options |= MSG_EXT_PPR_DT_REQ; /* IU requires DT */
2595         }
2596
2597         dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2598
2599         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2600                             starget->channel + 'A', ROLE_INITIATOR);
2601         ahd_find_syncrate(ahd, &period, &ppr_options,
2602                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2603
2604         ahd_lock(ahd, &flags);
2605         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2606                          ppr_options, AHD_TRANS_GOAL, FALSE);
2607         ahd_unlock(ahd, &flags);
2608 }
2609
2610 static void ahd_linux_set_rd_strm(struct scsi_target *starget, int rdstrm)
2611 {
2612         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2613         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2614         struct ahd_tmode_tstate *tstate;
2615         struct ahd_initiator_tinfo *tinfo
2616                 = ahd_fetch_transinfo(ahd,
2617                                       starget->channel + 'A',
2618                                       shost->this_id, starget->id, &tstate);
2619         struct ahd_devinfo devinfo;
2620         unsigned int ppr_options = tinfo->goal.ppr_options
2621                 & ~MSG_EXT_PPR_RD_STRM;
2622         unsigned int period = tinfo->goal.period;
2623         unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2624         unsigned long flags;
2625
2626 #ifdef AHD_DEBUG
2627         if ((ahd_debug & AHD_SHOW_DV) != 0)
2628                 printk("%s: %s Read Streaming\n", ahd_name(ahd),
2629                        rdstrm  ? "enabling" : "disabling");
2630 #endif
2631
2632         if (rdstrm && spi_max_width(starget))
2633                 ppr_options |= MSG_EXT_PPR_RD_STRM;
2634
2635         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2636                             starget->channel + 'A', ROLE_INITIATOR);
2637         ahd_find_syncrate(ahd, &period, &ppr_options,
2638                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2639
2640         ahd_lock(ahd, &flags);
2641         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2642                          ppr_options, AHD_TRANS_GOAL, FALSE);
2643         ahd_unlock(ahd, &flags);
2644 }
2645
2646 static void ahd_linux_set_wr_flow(struct scsi_target *starget, int wrflow)
2647 {
2648         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2649         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2650         struct ahd_tmode_tstate *tstate;
2651         struct ahd_initiator_tinfo *tinfo
2652                 = ahd_fetch_transinfo(ahd,
2653                                       starget->channel + 'A',
2654                                       shost->this_id, starget->id, &tstate);
2655         struct ahd_devinfo devinfo;
2656         unsigned int ppr_options = tinfo->goal.ppr_options
2657                 & ~MSG_EXT_PPR_WR_FLOW;
2658         unsigned int period = tinfo->goal.period;
2659         unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2660         unsigned long flags;
2661
2662 #ifdef AHD_DEBUG
2663         if ((ahd_debug & AHD_SHOW_DV) != 0)
2664                 printk("%s: %s Write Flow Control\n", ahd_name(ahd),
2665                        wrflow ? "enabling" : "disabling");
2666 #endif
2667
2668         if (wrflow && spi_max_width(starget))
2669                 ppr_options |= MSG_EXT_PPR_WR_FLOW;
2670
2671         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2672                             starget->channel + 'A', ROLE_INITIATOR);
2673         ahd_find_syncrate(ahd, &period, &ppr_options,
2674                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2675
2676         ahd_lock(ahd, &flags);
2677         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2678                          ppr_options, AHD_TRANS_GOAL, FALSE);
2679         ahd_unlock(ahd, &flags);
2680 }
2681
2682 static void ahd_linux_set_rti(struct scsi_target *starget, int rti)
2683 {
2684         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2685         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2686         struct ahd_tmode_tstate *tstate;
2687         struct ahd_initiator_tinfo *tinfo
2688                 = ahd_fetch_transinfo(ahd,
2689                                       starget->channel + 'A',
2690                                       shost->this_id, starget->id, &tstate);
2691         struct ahd_devinfo devinfo;
2692         unsigned int ppr_options = tinfo->goal.ppr_options
2693                 & ~MSG_EXT_PPR_RTI;
2694         unsigned int period = tinfo->goal.period;
2695         unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2696         unsigned long flags;
2697
2698         if ((ahd->features & AHD_RTI) == 0) {
2699 #ifdef AHD_DEBUG
2700                 if ((ahd_debug & AHD_SHOW_DV) != 0)
2701                         printk("%s: RTI not available\n", ahd_name(ahd));
2702 #endif
2703                 return;
2704         }
2705
2706 #ifdef AHD_DEBUG
2707         if ((ahd_debug & AHD_SHOW_DV) != 0)
2708                 printk("%s: %s RTI\n", ahd_name(ahd),
2709                        rti ? "enabling" : "disabling");
2710 #endif
2711
2712         if (rti && spi_max_width(starget))
2713                 ppr_options |= MSG_EXT_PPR_RTI;
2714
2715         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2716                             starget->channel + 'A', ROLE_INITIATOR);
2717         ahd_find_syncrate(ahd, &period, &ppr_options,
2718                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2719
2720         ahd_lock(ahd, &flags);
2721         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2722                          ppr_options, AHD_TRANS_GOAL, FALSE);
2723         ahd_unlock(ahd, &flags);
2724 }
2725
2726 static void ahd_linux_set_pcomp_en(struct scsi_target *starget, int pcomp)
2727 {
2728         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2729         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2730         struct ahd_tmode_tstate *tstate;
2731         struct ahd_initiator_tinfo *tinfo
2732                 = ahd_fetch_transinfo(ahd,
2733                                       starget->channel + 'A',
2734                                       shost->this_id, starget->id, &tstate);
2735         struct ahd_devinfo devinfo;
2736         unsigned int ppr_options = tinfo->goal.ppr_options
2737                 & ~MSG_EXT_PPR_PCOMP_EN;
2738         unsigned int period = tinfo->goal.period;
2739         unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2740         unsigned long flags;
2741
2742 #ifdef AHD_DEBUG
2743         if ((ahd_debug & AHD_SHOW_DV) != 0)
2744                 printk("%s: %s Precompensation\n", ahd_name(ahd),
2745                        pcomp ? "Enable" : "Disable");
2746 #endif
2747
2748         if (pcomp && spi_max_width(starget)) {
2749                 uint8_t precomp;
2750
2751                 if (ahd->unit < ARRAY_SIZE(aic79xx_iocell_info)) {
2752                         const struct ahd_linux_iocell_opts *iocell_opts;
2753
2754                         iocell_opts = &aic79xx_iocell_info[ahd->unit];
2755                         precomp = iocell_opts->precomp;
2756                 } else {
2757                         precomp = AIC79XX_DEFAULT_PRECOMP;
2758                 }
2759                 ppr_options |= MSG_EXT_PPR_PCOMP_EN;
2760                 AHD_SET_PRECOMP(ahd, precomp);
2761         } else {
2762                 AHD_SET_PRECOMP(ahd, 0);
2763         }
2764
2765         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2766                             starget->channel + 'A', ROLE_INITIATOR);
2767         ahd_find_syncrate(ahd, &period, &ppr_options,
2768                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2769
2770         ahd_lock(ahd, &flags);
2771         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2772                          ppr_options, AHD_TRANS_GOAL, FALSE);
2773         ahd_unlock(ahd, &flags);
2774 }
2775
2776 static void ahd_linux_set_hold_mcs(struct scsi_target *starget, int hold)
2777 {
2778         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2779         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2780         struct ahd_tmode_tstate *tstate;
2781         struct ahd_initiator_tinfo *tinfo
2782                 = ahd_fetch_transinfo(ahd,
2783                                       starget->channel + 'A',
2784                                       shost->this_id, starget->id, &tstate);
2785         struct ahd_devinfo devinfo;
2786         unsigned int ppr_options = tinfo->goal.ppr_options
2787                 & ~MSG_EXT_PPR_HOLD_MCS;
2788         unsigned int period = tinfo->goal.period;
2789         unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2790         unsigned long flags;
2791
2792         if (hold && spi_max_width(starget))
2793                 ppr_options |= MSG_EXT_PPR_HOLD_MCS;
2794
2795         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2796                             starget->channel + 'A', ROLE_INITIATOR);
2797         ahd_find_syncrate(ahd, &period, &ppr_options,
2798                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2799
2800         ahd_lock(ahd, &flags);
2801         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2802                          ppr_options, AHD_TRANS_GOAL, FALSE);
2803         ahd_unlock(ahd, &flags);
2804 }
2805
2806 static void ahd_linux_get_signalling(struct Scsi_Host *shost)
2807 {
2808         struct ahd_softc *ahd = *(struct ahd_softc **)shost->hostdata;
2809         unsigned long flags;
2810         u8 mode;
2811
2812         ahd_lock(ahd, &flags);
2813         ahd_pause(ahd);
2814         mode = ahd_inb(ahd, SBLKCTL);
2815         ahd_unpause(ahd);
2816         ahd_unlock(ahd, &flags);
2817
2818         if (mode & ENAB40)
2819                 spi_signalling(shost) = SPI_SIGNAL_LVD;
2820         else if (mode & ENAB20)
2821                 spi_signalling(shost) = SPI_SIGNAL_SE;
2822         else
2823                 spi_signalling(shost) = SPI_SIGNAL_UNKNOWN;
2824 }
2825
2826 static struct spi_function_template ahd_linux_transport_functions = {
2827         .set_offset     = ahd_linux_set_offset,
2828         .show_offset    = 1,
2829         .set_period     = ahd_linux_set_period,
2830         .show_period    = 1,
2831         .set_width      = ahd_linux_set_width,
2832         .show_width     = 1,
2833         .set_dt         = ahd_linux_set_dt,
2834         .show_dt        = 1,
2835         .set_iu         = ahd_linux_set_iu,
2836         .show_iu        = 1,
2837         .set_qas        = ahd_linux_set_qas,
2838         .show_qas       = 1,
2839         .set_rd_strm    = ahd_linux_set_rd_strm,
2840         .show_rd_strm   = 1,
2841         .set_wr_flow    = ahd_linux_set_wr_flow,
2842         .show_wr_flow   = 1,
2843         .set_rti        = ahd_linux_set_rti,
2844         .show_rti       = 1,
2845         .set_pcomp_en   = ahd_linux_set_pcomp_en,
2846         .show_pcomp_en  = 1,
2847         .set_hold_mcs   = ahd_linux_set_hold_mcs,
2848         .show_hold_mcs  = 1,
2849         .get_signalling = ahd_linux_get_signalling,
2850 };
2851
2852 static int __init
2853 ahd_linux_init(void)
2854 {
2855         int     error = 0;
2856
2857         /*
2858          * If we've been passed any parameters, process them now.
2859          */
2860         if (aic79xx)
2861                 aic79xx_setup(aic79xx);
2862
2863         ahd_linux_transport_template =
2864                 spi_attach_transport(&ahd_linux_transport_functions);
2865         if (!ahd_linux_transport_template)
2866                 return -ENODEV;
2867
2868         scsi_transport_reserve_device(ahd_linux_transport_template,
2869                                       sizeof(struct ahd_linux_device));
2870
2871         error = ahd_linux_pci_init();
2872         if (error)
2873                 spi_release_transport(ahd_linux_transport_template);
2874         return error;
2875 }
2876
2877 static void __exit
2878 ahd_linux_exit(void)
2879 {
2880         ahd_linux_pci_exit();
2881         spi_release_transport(ahd_linux_transport_template);
2882 }
2883
2884 module_init(ahd_linux_init);
2885 module_exit(ahd_linux_exit);