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
  57 /*
  58  * Bucket size for counting good commands in between bad ones.
  59  */
  60 #define AHD_LINUX_ERR_THRESH    1000
  61
  62 /*
  63  * Set this to the delay in seconds after SCSI bus reset.
  64  * Note, we honor this only for the initial bus reset.
  65  * The scsi error recovery code performs its own bus settle
  66  * delay handling for error recovery actions.
  67  */
  68 #ifdef CONFIG_AIC79XX_RESET_DELAY_MS
  69 #define AIC79XX_RESET_DELAY CONFIG_AIC79XX_RESET_DELAY_MS
  70 #else
  71 #define AIC79XX_RESET_DELAY 5000
  72 #endif
  73
  74 /*
  75  * To change the default number of tagged transactions allowed per-device,
  76  * add a line to the lilo.conf file like:
  77  * append="aic79xx=verbose,tag_info:{{32,32,32,32},{32,32,32,32}}"
  78  * which will result in the first four devices on the first two
  79  * controllers being set to a tagged queue depth of 32.
  80  *
  81  * The tag_commands is an array of 16 to allow for wide and twin adapters.
  82  * Twin adapters will use indexes 0-7 for channel 0, and indexes 8-15
  83  * for channel 1.
  84  */
  85 typedef struct {
  86         uint16_t tag_commands[16];      /* Allow for wide/twin adapters. */
  87 } adapter_tag_info_t;
  88
  89 /*
  90  * Modify this as you see fit for your system.
  91  *
  92  * 0                    tagged queuing disabled
  93  * 1 <= n <= 253        n == max tags ever dispatched.
  94  *
  95  * The driver will throttle the number of commands dispatched to a
  96  * device if it returns queue full.  For devices with a fixed maximum
  97  * queue depth, the driver will eventually determine this depth and
  98  * lock it in (a console message is printed to indicate that a lock
  99  * has occurred).  On some devices, queue full is returned for a temporary
 100  * resource shortage.  These devices will return queue full at varying
 101  * depths.  The driver will throttle back when the queue fulls occur and
 102  * attempt to slowly increase the depth over time as the device recovers
 103  * from the resource shortage.
 104  *
 105  * In this example, the first line will disable tagged queueing for all
 106  * the devices on the first probed aic79xx adapter.
 107  *
 108  * The second line enables tagged queueing with 4 commands/LUN for IDs
 109  * (0, 2-11, 13-15), disables tagged queueing for ID 12, and tells the
 110  * driver to attempt to use up to 64 tags for ID 1.
 111  *
 112  * The third line is the same as the first line.
 113  *
 114  * The fourth line disables tagged queueing for devices 0 and 3.  It
 115  * enables tagged queueing for the other IDs, with 16 commands/LUN
 116  * for IDs 1 and 4, 127 commands/LUN for ID 8, and 4 commands/LUN for
 117  * IDs 2, 5-7, and 9-15.
 118  */
 119
 120 /*
 121  * NOTE: The below structure is for reference only, the actual structure
 122  *       to modify in order to change things is just below this comment block.
 123 adapter_tag_info_t aic79xx_tag_info[] =
 124 {
 125         {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
 126         {{4, 64, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 0, 4, 4, 4}},
 127         {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
 128         {{0, 16, 4, 0, 16, 4, 4, 4, 127, 4, 4, 4, 4, 4, 4, 4}}
 129 };
 130 */
 131
 132 #ifdef CONFIG_AIC79XX_CMDS_PER_DEVICE
 133 #define AIC79XX_CMDS_PER_DEVICE CONFIG_AIC79XX_CMDS_PER_DEVICE
 134 #else
 135 #define AIC79XX_CMDS_PER_DEVICE AHD_MAX_QUEUE
 136 #endif
 137
 138 #define AIC79XX_CONFIGED_TAG_COMMANDS {                                 \
 139         AIC79XX_CMDS_PER_DEVICE, AIC79XX_CMDS_PER_DEVICE,               \
 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 }
 148
 149 /*
 150  * By default, use the number of commands specified by
 151  * the users kernel configuration.
 152  */
 153 static adapter_tag_info_t aic79xx_tag_info[] =
 154 {
 155         {AIC79XX_CONFIGED_TAG_COMMANDS},
 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 };
 172
 173 /*
 174  * The I/O cell on the chip is very configurable in respect to its analog
 175  * characteristics.  Set the defaults here; they can be overriden with
 176  * the proper insmod parameters.
 177  */
 178 struct ahd_linux_iocell_opts
 179 {
 180         uint8_t precomp;
 181         uint8_t slewrate;
 182         uint8_t amplitude;
 183 };
 184 #define AIC79XX_DEFAULT_PRECOMP         0xFF
 185 #define AIC79XX_DEFAULT_SLEWRATE        0xFF
 186 #define AIC79XX_DEFAULT_AMPLITUDE       0xFF
 187 #define AIC79XX_DEFAULT_IOOPTS                  \
 188 {                                               \
 189         AIC79XX_DEFAULT_PRECOMP,                \
 190         AIC79XX_DEFAULT_SLEWRATE,               \
 191         AIC79XX_DEFAULT_AMPLITUDE               \
 192 }
 193 #define AIC79XX_PRECOMP_INDEX   0
 194 #define AIC79XX_SLEWRATE_INDEX  1
 195 #define AIC79XX_AMPLITUDE_INDEX 2
 196 static struct ahd_linux_iocell_opts aic79xx_iocell_info[] =
 197 {
 198         AIC79XX_DEFAULT_IOOPTS,
 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 };
 215
 216 /*
 217  * There should be a specific return value for this in scsi.h, but
 218  * it seems that most drivers ignore it.
 219  */
 220 #define DID_UNDERFLOW   DID_ERROR
 221
 222 void
 223 ahd_print_path(struct ahd_softc *ahd, struct scb *scb)
 224 {
 225         printk("(scsi%d:%c:%d:%d): ",
 226                ahd->platform_data->host->host_no,
 227                scb != NULL ? SCB_GET_CHANNEL(ahd, scb) : 'X',
 228                scb != NULL ? SCB_GET_TARGET(ahd, scb) : -1,
 229                scb != NULL ? SCB_GET_LUN(scb) : -1);
 230 }
 231
 232 /*
 233  * XXX - these options apply unilaterally to _all_ adapters
 234  *       cards in the system.  This should be fixed.  Exceptions to this
 235  *       rule are noted in the comments.
 236  */
 237
 238 /*
 239  * Skip the scsi bus reset.  Non 0 make us skip the reset at startup.  This
 240  * has no effect on any later resets that might occur due to things like
 241  * SCSI bus timeouts.
 242  */
 243 static uint32_t aic79xx_no_reset;
 244
 245 /*
 246  * Should we force EXTENDED translation on a controller.
 247  *     0 == Use whatever is in the SEEPROM or default to off
 248  *     1 == Use whatever is in the SEEPROM or default to on
 249  */
 250 static uint32_t aic79xx_extended;
 251
 252 /*
 253  * PCI bus parity checking of the Adaptec controllers.  This is somewhat
 254  * dubious at best.  To my knowledge, this option has never actually
 255  * solved a PCI parity problem, but on certain machines with broken PCI
 256  * chipset configurations, it can generate tons of false error messages.
 257  * It's included in the driver for completeness.
 258  *   0     = Shut off PCI parity check
 259  *   non-0 = Enable PCI parity check
 260  *
 261  * NOTE: you can't actually pass -1 on the lilo prompt.  So, to set this
 262  * variable to -1 you would actually want to simply pass the variable
 263  * name without a number.  That will invert the 0 which will result in
 264  * -1.
 265  */
 266 static uint32_t aic79xx_pci_parity = ~0;
 267
 268 /*
 269  * There are lots of broken chipsets in the world.  Some of them will
 270  * violate the PCI spec when we issue byte sized memory writes to our
 271  * controller.  I/O mapped register access, if allowed by the given
 272  * platform, will work in almost all cases.
 273  */
 274 uint32_t aic79xx_allow_memio = ~0;
 275
 276 /*
 277  * So that we can set how long each device is given as a selection timeout.
 278  * The table of values goes like this:
 279  *   0 - 256ms
 280  *   1 - 128ms
 281  *   2 - 64ms
 282  *   3 - 32ms
 283  * We default to 256ms because some older devices need a longer time
 284  * to respond to initial selection.
 285  */
 286 static uint32_t aic79xx_seltime;
 287
 288 /*
 289  * Certain devices do not perform any aging on commands.  Should the
 290  * device be saturated by commands in one portion of the disk, it is
 291  * possible for transactions on far away sectors to never be serviced.
 292  * To handle these devices, we can periodically send an ordered tag to
 293  * force all outstanding transactions to be serviced prior to a new
 294  * transaction.
 295  */
 296 static uint32_t aic79xx_periodic_otag;
 297
 298 /* Some storage boxes are using an LSI chip which has a bug making it
 299  * impossible to use aic79xx Rev B chip in 320 speeds.  The following
 300  * storage boxes have been reported to be buggy:
 301  * EonStor 3U 16-Bay: U16U-G3A3
 302  * EonStor 2U 12-Bay: U12U-G3A3
 303  * SentinelRAID: 2500F R5 / R6
 304  * SentinelRAID: 2500F R1
 305  * SentinelRAID: 2500F/1500F
 306  * SentinelRAID: 150F
 307  *
 308  * To get around this LSI bug, you can set your board to 160 mode
 309  * or you can enable the SLOWCRC bit.
 310  */
 311 uint32_t aic79xx_slowcrc;
 312
 313 /*
 314  * Module information and settable options.
 315  */
 316 static char *aic79xx = NULL;
 317
 318 MODULE_AUTHOR("Maintainer: Justin T. Gibbs <gibbs@scsiguy.com>");
 319 MODULE_DESCRIPTION("Adaptec Aic790X U320 SCSI Host Bus Adapter driver");
 320 MODULE_LICENSE("Dual BSD/GPL");
 321 MODULE_VERSION(AIC79XX_DRIVER_VERSION);
 322 module_param(aic79xx, charp, 0444);
 323 MODULE_PARM_DESC(aic79xx,
 324 "period-delimited options string:\n"
 325 "       verbose                 Enable verbose/diagnostic logging\n"
 326 "       allow_memio             Allow device registers to be memory mapped\n"
 327 "       debug                   Bitmask of debug values to enable\n"
 328 "       no_reset                Supress initial bus resets\n"
 329 "       extended                Enable extended geometry on all controllers\n"
 330 "       periodic_otag           Send an ordered tagged transaction\n"
 331 "                               periodically to prevent tag starvation.\n"
 332 "                               This may be required by some older disk\n"
 333 "                               or drives/RAID arrays.\n"
 334 "       tag_info:<tag_str>      Set per-target tag depth\n"
 335 "       global_tag_depth:<int>  Global tag depth for all targets on all buses\n"
 336 "       slewrate:<slewrate_list>Set the signal slew rate (0-15).\n"
 337 "       precomp:<pcomp_list>    Set the signal precompensation (0-7).\n"
 338 "       amplitude:<int>         Set the signal amplitude (0-7).\n"
 339 "       seltime:<int>           Selection Timeout:\n"
 340 "                               (0/256ms,1/128ms,2/64ms,3/32ms)\n"
 341 "       slowcrc                 Turn on the SLOWCRC bit (Rev B only)\n"
 342 "\n"
 343 "       Sample /etc/modprobe.conf line:\n"
 344 "               Enable verbose logging\n"
 345 "               Set tag depth on Controller 2/Target 2 to 10 tags\n"
 346 "               Shorten the selection timeout to 128ms\n"
 347 "\n"
 348 "       options aic79xx 'aic79xx=verbose.tag_info:{{}.{}.{..10}}.seltime:1'\n"
 349 );
 350
 351 static void ahd_linux_handle_scsi_status(struct ahd_softc *,
 352                                          struct scsi_device *,
 353                                          struct scb *);
 354 static void ahd_linux_queue_cmd_complete(struct ahd_softc *ahd,
 355                                          struct scsi_cmnd *cmd);
 356 static int ahd_linux_queue_abort_cmd(struct scsi_cmnd *cmd);
 357 static void ahd_linux_initialize_scsi_bus(struct ahd_softc *ahd);
 358 static u_int ahd_linux_user_tagdepth(struct ahd_softc *ahd,
 359                                      struct ahd_devinfo *devinfo);
 360 static void ahd_linux_device_queue_depth(struct scsi_device *);
 361 static int ahd_linux_run_command(struct ahd_softc*,
 362                                  struct ahd_linux_device *,
 363                                  struct scsi_cmnd *);
 364 static void ahd_linux_setup_tag_info_global(char *p);
 365 static int  aic79xx_setup(char *c);
 366
 367 static int ahd_linux_unit;
 368
 369
 370 /****************************** Inlines ***************************************/
 371 static __inline void ahd_linux_unmap_scb(struct ahd_softc*, struct scb*);
 372
 373 static __inline void
 374 ahd_linux_unmap_scb(struct ahd_softc *ahd, struct scb *scb)
 375 {
 376         struct scsi_cmnd *cmd;
 377         int direction;
 378
 379         cmd = scb->io_ctx;
 380         direction = cmd->sc_data_direction;
 381         ahd_sync_sglist(ahd, scb, BUS_DMASYNC_POSTWRITE);
 382         if (cmd->use_sg != 0) {
 383                 struct scatterlist *sg;
 384
 385                 sg = (struct scatterlist *)cmd->request_buffer;
 386                 pci_unmap_sg(ahd->dev_softc, sg, cmd->use_sg, direction);
 387         } else if (cmd->request_bufflen != 0) {
 388                 pci_unmap_single(ahd->dev_softc,
 389                                  scb->platform_data->buf_busaddr,
 390                                  cmd->request_bufflen, direction);
 391         }
 392 }
 393
 394 /******************************** Macros **************************************/
 395 #define BUILD_SCSIID(ahd, cmd)                                          \
 396         (((scmd_id(cmd) << TID_SHIFT) & TID) | (ahd)->our_id)
 397
 398 /*
 399  * Return a string describing the driver.
 400  */
 401 static const char *
 402 ahd_linux_info(struct Scsi_Host *host)
 403 {
 404         static char buffer[512];
 405         char    ahd_info[256];
 406         char   *bp;
 407         struct ahd_softc *ahd;
 408
 409         bp = &buffer[0];
 410         ahd = *(struct ahd_softc **)host->hostdata;
 411         memset(bp, 0, sizeof(buffer));
 412         strcpy(bp, "Adaptec AIC79XX PCI-X SCSI HBA DRIVER, Rev ");
 413         strcat(bp, AIC79XX_DRIVER_VERSION);
 414         strcat(bp, "\n");
 415         strcat(bp, "        <");
 416         strcat(bp, ahd->description);
 417         strcat(bp, ">\n");
 418         strcat(bp, "        ");
 419         ahd_controller_info(ahd, ahd_info);
 420         strcat(bp, ahd_info);
 421         strcat(bp, "\n");
 422
 423         return (bp);
 424 }
 425
 426 /*
 427  * Queue an SCB to the controller.
 428  */
 429 static int
 430 ahd_linux_queue(struct scsi_cmnd * cmd, void (*scsi_done) (struct scsi_cmnd *))
 431 {
 432         struct   ahd_softc *ahd;
 433         struct   ahd_linux_device *dev = scsi_transport_device_data(cmd->device);
 434         int rtn = SCSI_MLQUEUE_HOST_BUSY;
 435
 436         ahd = *(struct ahd_softc **)cmd->device->host->hostdata;
 437
 438         cmd->scsi_done = scsi_done;
 439         cmd->result = CAM_REQ_INPROG << 16;
 440         rtn = ahd_linux_run_command(ahd, dev, cmd);
 441
 442         return rtn;
 443 }
 444
 445 static inline struct scsi_target **
 446 ahd_linux_target_in_softc(struct scsi_target *starget)
 447 {
 448         struct  ahd_softc *ahd =
 449                 *((struct ahd_softc **)dev_to_shost(&starget->dev)->hostdata);
 450         unsigned int target_offset;
 451
 452         target_offset = starget->id;
 453         if (starget->channel != 0)
 454                 target_offset += 8;
 455
 456         return &ahd->platform_data->starget[target_offset];
 457 }
 458
 459 static int
 460 ahd_linux_target_alloc(struct scsi_target *starget)
 461 {
 462         struct  ahd_softc *ahd =
 463                 *((struct ahd_softc **)dev_to_shost(&starget->dev)->hostdata);
 464         struct seeprom_config *sc = ahd->seep_config;
 465         unsigned long flags;
 466         struct scsi_target **ahd_targp = ahd_linux_target_in_softc(starget);
 467         struct ahd_devinfo devinfo;
 468         struct ahd_initiator_tinfo *tinfo;
 469         struct ahd_tmode_tstate *tstate;
 470         char channel = starget->channel + 'A';
 471
 472         ahd_lock(ahd, &flags);
 473
 474         BUG_ON(*ahd_targp != NULL);
 475
 476         *ahd_targp = starget;
 477
 478         if (sc) {
 479                 int flags = sc->device_flags[starget->id];
 480
 481                 tinfo = ahd_fetch_transinfo(ahd, 'A', ahd->our_id,
 482                                             starget->id, &tstate);
 483
 484                 if ((flags  & CFPACKETIZED) == 0) {
 485                         /* Do not negotiate packetized transfers */
 486                         spi_rd_strm(starget) = 0;
 487                         spi_pcomp_en(starget) = 0;
 488                         spi_rti(starget) = 0;
 489                         spi_wr_flow(starget) = 0;
 490                         spi_hold_mcs(starget) = 0;
 491                 } else {
 492                         if ((ahd->features & AHD_RTI) == 0)
 493                                 spi_rti(starget) = 0;
 494                 }
 495
 496                 if ((flags & CFQAS) == 0)
 497                         spi_qas(starget) = 0;
 498
 499                 /* Transinfo values have been set to BIOS settings */
 500                 spi_max_width(starget) = (flags & CFWIDEB) ? 1 : 0;
 501                 spi_min_period(starget) = tinfo->user.period;
 502                 spi_max_offset(starget) = tinfo->user.offset;
 503         }
 504
 505         tinfo = ahd_fetch_transinfo(ahd, channel, ahd->our_id,
 506                                     starget->id, &tstate);
 507         ahd_compile_devinfo(&devinfo, ahd->our_id, starget->id,
 508                             CAM_LUN_WILDCARD, channel,
 509                             ROLE_INITIATOR);
 510         ahd_set_syncrate(ahd, &devinfo, 0, 0, 0,
 511                          AHD_TRANS_GOAL, /*paused*/FALSE);
 512         ahd_set_width(ahd, &devinfo, MSG_EXT_WDTR_BUS_8_BIT,
 513                       AHD_TRANS_GOAL, /*paused*/FALSE);
 514         ahd_unlock(ahd, &flags);
 515
 516         return 0;
 517 }
 518
 519 static void
 520 ahd_linux_target_destroy(struct scsi_target *starget)
 521 {
 522         struct scsi_target **ahd_targp = ahd_linux_target_in_softc(starget);
 523
 524         *ahd_targp = NULL;
 525 }
 526
 527 static int
 528 ahd_linux_slave_alloc(struct scsi_device *sdev)
 529 {
 530         struct  ahd_softc *ahd =
 531                 *((struct ahd_softc **)sdev->host->hostdata);
 532         struct ahd_linux_device *dev;
 533
 534         if (bootverbose)
 535                 printf("%s: Slave Alloc %d\n", ahd_name(ahd), sdev->id);
 536
 537         dev = scsi_transport_device_data(sdev);
 538         memset(dev, 0, sizeof(*dev));
 539
 540         /*
 541          * We start out life using untagged
 542          * transactions of which we allow one.
 543          */
 544         dev->openings = 1;
 545
 546         /*
 547          * Set maxtags to 0.  This will be changed if we
 548          * later determine that we are dealing with
 549          * a tagged queuing capable device.
 550          */
 551         dev->maxtags = 0;
 552
 553         return (0);
 554 }
 555
 556 static int
 557 ahd_linux_slave_configure(struct scsi_device *sdev)
 558 {
 559         struct  ahd_softc *ahd;
 560
 561         ahd = *((struct ahd_softc **)sdev->host->hostdata);
 562         if (bootverbose)
 563                 sdev_printk(KERN_INFO, sdev, "Slave Configure\n");
 564
 565         ahd_linux_device_queue_depth(sdev);
 566
 567         /* Initial Domain Validation */
 568         if (!spi_initial_dv(sdev->sdev_target))
 569                 spi_dv_device(sdev);
 570
 571         return 0;
 572 }
 573
 574 #if defined(__i386__)
 575 /*
 576  * Return the disk geometry for the given SCSI device.
 577  */
 578 static int
 579 ahd_linux_biosparam(struct scsi_device *sdev, struct block_device *bdev,
 580                     sector_t capacity, int geom[])
 581 {
 582         uint8_t *bh;
 583         int      heads;
 584         int      sectors;
 585         int      cylinders;
 586         int      ret;
 587         int      extended;
 588         struct   ahd_softc *ahd;
 589
 590         ahd = *((struct ahd_softc **)sdev->host->hostdata);
 591
 592         bh = scsi_bios_ptable(bdev);
 593         if (bh) {
 594                 ret = scsi_partsize(bh, capacity,
 595                                     &geom[2], &geom[0], &geom[1]);
 596                 kfree(bh);
 597                 if (ret != -1)
 598                         return (ret);
 599         }
 600         heads = 64;
 601         sectors = 32;
 602         cylinders = aic_sector_div(capacity, heads, sectors);
 603
 604         if (aic79xx_extended != 0)
 605                 extended = 1;
 606         else
 607                 extended = (ahd->flags & AHD_EXTENDED_TRANS_A) != 0;
 608         if (extended && cylinders >= 1024) {
 609                 heads = 255;
 610                 sectors = 63;
 611                 cylinders = aic_sector_div(capacity, heads, sectors);
 612         }
 613         geom[0] = heads;
 614         geom[1] = sectors;
 615         geom[2] = cylinders;
 616         return (0);
 617 }
 618 #endif
 619
 620 /*
 621  * Abort the current SCSI command(s).
 622  */
 623 static int
 624 ahd_linux_abort(struct scsi_cmnd *cmd)
 625 {
 626         int error;
 627
 628         error = ahd_linux_queue_abort_cmd(cmd);
 629
 630         return error;
 631 }
 632
 633 /*
 634  * Attempt to send a target reset message to the device that timed out.
 635  */
 636 static int
 637 ahd_linux_dev_reset(struct scsi_cmnd *cmd)
 638 {
 639         struct ahd_softc *ahd;
 640         struct ahd_linux_device *dev;
 641         struct scb *reset_scb;
 642         u_int  cdb_byte;
 643         int    retval = SUCCESS;
 644         int    paused;
 645         int    wait;
 646         struct  ahd_initiator_tinfo *tinfo;
 647         struct  ahd_tmode_tstate *tstate;
 648         unsigned long flags;
 649         DECLARE_COMPLETION_ONSTACK(done);
 650
 651         reset_scb = NULL;
 652         paused = FALSE;
 653         wait = FALSE;
 654         ahd = *(struct ahd_softc **)cmd->device->host->hostdata;
 655
 656         scmd_printk(KERN_INFO, cmd,
 657                     "Attempting to queue a TARGET RESET message:");
 658
 659         printf("CDB:");
 660         for (cdb_byte = 0; cdb_byte < cmd->cmd_len; cdb_byte++)
 661                 printf(" 0x%x", cmd->cmnd[cdb_byte]);
 662         printf("\n");
 663
 664         /*
 665          * Determine if we currently own this command.
 666          */
 667         dev = scsi_transport_device_data(cmd->device);
 668
 669         if (dev == NULL) {
 670                 /*
 671                  * No target device for this command exists,
 672                  * so we must not still own the command.
 673                  */
 674                 scmd_printk(KERN_INFO, cmd, "Is not an active device\n");
 675                 return SUCCESS;
 676         }
 677
 678         /*
 679          * Generate us a new SCB
 680          */
 681         reset_scb = ahd_get_scb(ahd, AHD_NEVER_COL_IDX);
 682         if (!reset_scb) {
 683                 scmd_printk(KERN_INFO, cmd, "No SCB available\n");
 684                 return FAILED;
 685         }
 686
 687         tinfo = ahd_fetch_transinfo(ahd, 'A', ahd->our_id,
 688                                     cmd->device->id, &tstate);
 689         reset_scb->io_ctx = cmd;
 690         reset_scb->platform_data->dev = dev;
 691         reset_scb->sg_count = 0;
 692         ahd_set_residual(reset_scb, 0);
 693         ahd_set_sense_residual(reset_scb, 0);
 694         reset_scb->platform_data->xfer_len = 0;
 695         reset_scb->hscb->control = 0;
 696         reset_scb->hscb->scsiid = BUILD_SCSIID(ahd,cmd);
 697         reset_scb->hscb->lun = cmd->device->lun;
 698         reset_scb->hscb->cdb_len = 0;
 699         reset_scb->hscb->task_management = SIU_TASKMGMT_LUN_RESET;
 700         reset_scb->flags |= SCB_DEVICE_RESET|SCB_RECOVERY_SCB|SCB_ACTIVE;
 701         if ((tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ) != 0) {
 702                 reset_scb->flags |= SCB_PACKETIZED;
 703         } else {
 704                 reset_scb->hscb->control |= MK_MESSAGE;
 705         }
 706         dev->openings--;
 707         dev->active++;
 708         dev->commands_issued++;
 709
 710         ahd_lock(ahd, &flags);
 711
 712         LIST_INSERT_HEAD(&ahd->pending_scbs, reset_scb, pending_links);
 713         ahd_queue_scb(ahd, reset_scb);
 714
 715         ahd->platform_data->eh_done = &done;
 716         ahd_unlock(ahd, &flags);
 717
 718         printf("%s: Device reset code sleeping\n", ahd_name(ahd));
 719         if (!wait_for_completion_timeout(&done, 5 * HZ)) {
 720                 ahd_lock(ahd, &flags);
 721                 ahd->platform_data->eh_done = NULL;
 722                 ahd_unlock(ahd, &flags);
 723                 printf("%s: Device reset timer expired (active %d)\n",
 724                        ahd_name(ahd), dev->active);
 725                 retval = FAILED;
 726         }
 727         printf("%s: Device reset returning 0x%x\n", ahd_name(ahd), retval);
 728
 729         return (retval);
 730 }
 731
 732 /*
 733  * Reset the SCSI bus.
 734  */
 735 static int
 736 ahd_linux_bus_reset(struct scsi_cmnd *cmd)
 737 {
 738         struct ahd_softc *ahd;
 739         int    found;
 740         unsigned long flags;
 741
 742         ahd = *(struct ahd_softc **)cmd->device->host->hostdata;
 743 #ifdef AHD_DEBUG
 744         if ((ahd_debug & AHD_SHOW_RECOVERY) != 0)
 745                 printf("%s: Bus reset called for cmd %p\n",
 746                        ahd_name(ahd), cmd);
 747 #endif
 748         ahd_lock(ahd, &flags);
 749
 750         found = ahd_reset_channel(ahd, scmd_channel(cmd) + 'A',
 751                                   /*initiate reset*/TRUE);
 752         ahd_unlock(ahd, &flags);
 753
 754         if (bootverbose)
 755                 printf("%s: SCSI bus reset delivered. "
 756                        "%d SCBs aborted.\n", ahd_name(ahd), found);
 757
 758         return (SUCCESS);
 759 }
 760
 761 struct scsi_host_template aic79xx_driver_template = {
 762         .module                 = THIS_MODULE,
 763         .name                   = "aic79xx",
 764         .proc_name              = "aic79xx",
 765         .proc_info              = ahd_linux_proc_info,
 766         .info                   = ahd_linux_info,
 767         .queuecommand           = ahd_linux_queue,
 768         .eh_abort_handler       = ahd_linux_abort,
 769         .eh_device_reset_handler = ahd_linux_dev_reset,
 770         .eh_bus_reset_handler   = ahd_linux_bus_reset,
 771 #if defined(__i386__)
 772         .bios_param             = ahd_linux_biosparam,
 773 #endif
 774         .can_queue              = AHD_MAX_QUEUE,
 775         .this_id                = -1,
 776         .max_sectors            = 8192,
 777         .cmd_per_lun            = 2,
 778         .use_clustering         = ENABLE_CLUSTERING,
 779         .slave_alloc            = ahd_linux_slave_alloc,
 780         .slave_configure        = ahd_linux_slave_configure,
 781         .target_alloc           = ahd_linux_target_alloc,
 782         .target_destroy         = ahd_linux_target_destroy,
 783 };
 784
 785 /******************************** Bus DMA *************************************/
 786 int
 787 ahd_dma_tag_create(struct ahd_softc *ahd, bus_dma_tag_t parent,
 788                    bus_size_t alignment, bus_size_t boundary,
 789                    dma_addr_t lowaddr, dma_addr_t highaddr,
 790                    bus_dma_filter_t *filter, void *filterarg,
 791                    bus_size_t maxsize, int nsegments,
 792                    bus_size_t maxsegsz, int flags, bus_dma_tag_t *ret_tag)
 793 {
 794         bus_dma_tag_t dmat;
 795
 796         dmat = malloc(sizeof(*dmat), M_DEVBUF, M_NOWAIT);
 797         if (dmat == NULL)
 798                 return (ENOMEM);
 799
 800         /*
 801          * Linux is very simplistic about DMA memory.  For now don't
 802          * maintain all specification information.  Once Linux supplies
 803          * better facilities for doing these operations, or the
 804          * needs of this particular driver change, we might need to do
 805          * more here.
 806          */
 807         dmat->alignment = alignment;
 808         dmat->boundary = boundary;
 809         dmat->maxsize = maxsize;
 810         *ret_tag = dmat;
 811         return (0);
 812 }
 813
 814 void
 815 ahd_dma_tag_destroy(struct ahd_softc *ahd, bus_dma_tag_t dmat)
 816 {
 817         free(dmat, M_DEVBUF);
 818 }
 819
 820 int
 821 ahd_dmamem_alloc(struct ahd_softc *ahd, bus_dma_tag_t dmat, void** vaddr,
 822                  int flags, bus_dmamap_t *mapp)
 823 {
 824         *vaddr = pci_alloc_consistent(ahd->dev_softc,
 825                                       dmat->maxsize, mapp);
 826         if (*vaddr == NULL)
 827                 return (ENOMEM);
 828         return(0);
 829 }
 830
 831 void
 832 ahd_dmamem_free(struct ahd_softc *ahd, bus_dma_tag_t dmat,
 833                 void* vaddr, bus_dmamap_t map)
 834 {
 835         pci_free_consistent(ahd->dev_softc, dmat->maxsize,
 836                             vaddr, map);
 837 }
 838
 839 int
 840 ahd_dmamap_load(struct ahd_softc *ahd, bus_dma_tag_t dmat, bus_dmamap_t map,
 841                 void *buf, bus_size_t buflen, bus_dmamap_callback_t *cb,
 842                 void *cb_arg, int flags)
 843 {
 844         /*
 845          * Assume for now that this will only be used during
 846          * initialization and not for per-transaction buffer mapping.
 847          */
 848         bus_dma_segment_t stack_sg;
 849
 850         stack_sg.ds_addr = map;
 851         stack_sg.ds_len = dmat->maxsize;
 852         cb(cb_arg, &stack_sg, /*nseg*/1, /*error*/0);
 853         return (0);
 854 }
 855
 856 void
 857 ahd_dmamap_destroy(struct ahd_softc *ahd, bus_dma_tag_t dmat, bus_dmamap_t map)
 858 {
 859 }
 860
 861 int
 862 ahd_dmamap_unload(struct ahd_softc *ahd, bus_dma_tag_t dmat, bus_dmamap_t map)
 863 {
 864         /* Nothing to do */
 865         return (0);
 866 }
 867
 868 /********************* Platform Dependent Functions ***************************/
 869 static void
 870 ahd_linux_setup_iocell_info(u_long index, int instance, int targ, int32_t value)
 871 {
 872
 873         if ((instance >= 0)
 874          && (instance < ARRAY_SIZE(aic79xx_iocell_info))) {
 875                 uint8_t *iocell_info;
 876
 877                 iocell_info = (uint8_t*)&aic79xx_iocell_info[instance];
 878                 iocell_info[index] = value & 0xFFFF;
 879                 if (bootverbose)
 880                         printf("iocell[%d:%ld] = %d\n", instance, index, value);
 881         }
 882 }
 883
 884 static void
 885 ahd_linux_setup_tag_info_global(char *p)
 886 {
 887         int tags, i, j;
 888
 889         tags = simple_strtoul(p + 1, NULL, 0) & 0xff;
 890         printf("Setting Global Tags= %d\n", tags);
 891
 892         for (i = 0; i < ARRAY_SIZE(aic79xx_tag_info); i++) {
 893                 for (j = 0; j < AHD_NUM_TARGETS; j++) {
 894                         aic79xx_tag_info[i].tag_commands[j] = tags;
 895                 }
 896         }
 897 }
 898
 899 static void
 900 ahd_linux_setup_tag_info(u_long arg, int instance, int targ, int32_t value)
 901 {
 902
 903         if ((instance >= 0) && (targ >= 0)
 904          && (instance < ARRAY_SIZE(aic79xx_tag_info))
 905          && (targ < AHD_NUM_TARGETS)) {
 906                 aic79xx_tag_info[instance].tag_commands[targ] = value & 0x1FF;
 907                 if (bootverbose)
 908                         printf("tag_info[%d:%d] = %d\n", instance, targ, value);
 909         }
 910 }
 911
 912 static char *
 913 ahd_parse_brace_option(char *opt_name, char *opt_arg, char *end, int depth,
 914                        void (*callback)(u_long, int, int, int32_t),
 915                        u_long callback_arg)
 916 {
 917         char    *tok_end;
 918         char    *tok_end2;
 919         int      i;
 920         int      instance;
 921         int      targ;
 922         int      done;
 923         char     tok_list[] = {'.', ',', '{', '}', '\0'};
 924
 925         /* All options use a ':' name/arg separator */
 926         if (*opt_arg != ':')
 927                 return (opt_arg);
 928         opt_arg++;
 929         instance = -1;
 930         targ = -1;
 931         done = FALSE;
 932         /*
 933          * Restore separator that may be in
 934          * the middle of our option argument.
 935          */
 936         tok_end = strchr(opt_arg, '\0');
 937         if (tok_end < end)
 938                 *tok_end = ',';
 939         while (!done) {
 940                 switch (*opt_arg) {
 941                 case '{':
 942                         if (instance == -1) {
 943                                 instance = 0;
 944                         } else {
 945                                 if (depth > 1) {
 946                                         if (targ == -1)
 947                                                 targ = 0;
 948                                 } else {
 949                                         printf("Malformed Option %s\n",
 950                                                opt_name);
 951                                         done = TRUE;
 952                                 }
 953                         }
 954                         opt_arg++;
 955                         break;
 956                 case '}':
 957                         if (targ != -1)
 958                                 targ = -1;
 959                         else if (instance != -1)
 960                                 instance = -1;
 961                         opt_arg++;
 962                         break;
 963                 case ',':
 964                 case '.':
 965                         if (instance == -1)
 966                                 done = TRUE;
 967                         else if (targ >= 0)
 968                                 targ++;
 969                         else if (instance >= 0)
 970                                 instance++;
 971                         opt_arg++;
 972                         break;
 973                 case '\0':
 974                         done = TRUE;
 975                         break;
 976                 default:
 977                         tok_end = end;
 978                         for (i = 0; tok_list[i]; i++) {
 979                                 tok_end2 = strchr(opt_arg, tok_list[i]);
 980                                 if ((tok_end2) && (tok_end2 < tok_end))
 981                                         tok_end = tok_end2;
 982                         }
 983                         callback(callback_arg, instance, targ,
 984                                  simple_strtol(opt_arg, NULL, 0));
 985                         opt_arg = tok_end;
 986                         break;
 987                 }
 988         }
 989         return (opt_arg);
 990 }
 991
 992 /*
 993  * Handle Linux boot parameters. This routine allows for assigning a value
 994  * to a parameter with a ':' between the parameter and the value.
 995  * ie. aic79xx=stpwlev:1,extended
 996  */
 997 static int
 998 aic79xx_setup(char *s)
 999 {
1000         int     i, n;
1001         char   *p;
1002         char   *end;
1003
1004         static struct {
1005                 const char *name;
1006                 uint32_t *flag;
1007         } options[] = {
1008                 { "extended", &aic79xx_extended },
1009                 { "no_reset", &aic79xx_no_reset },
1010                 { "verbose", &aic79xx_verbose },
1011                 { "allow_memio", &aic79xx_allow_memio},
1012 #ifdef AHD_DEBUG
1013                 { "debug", &ahd_debug },
1014 #endif
1015                 { "periodic_otag", &aic79xx_periodic_otag },
1016                 { "pci_parity", &aic79xx_pci_parity },
1017                 { "seltime", &aic79xx_seltime },
1018                 { "tag_info", NULL },
1019                 { "global_tag_depth", NULL},
1020                 { "slewrate", NULL },
1021                 { "precomp", NULL },
1022                 { "amplitude", NULL },
1023                 { "slowcrc", &aic79xx_slowcrc },
1024         };
1025
1026         end = strchr(s, '\0');
1027
1028         /*
1029          * XXX ia64 gcc isn't smart enough to know that ARRAY_SIZE
1030          * will never be 0 in this case.
1031          */
1032         n = 0;
1033
1034         while ((p = strsep(&s, ",.")) != NULL) {
1035                 if (*p == '\0')
1036                         continue;
1037                 for (i = 0; i < ARRAY_SIZE(options); i++) {
1038
1039                         n = strlen(options[i].name);
1040                         if (strncmp(options[i].name, p, n) == 0)
1041                                 break;
1042                 }
1043                 if (i == ARRAY_SIZE(options))
1044                         continue;
1045
1046                 if (strncmp(p, "global_tag_depth", n) == 0) {
1047                         ahd_linux_setup_tag_info_global(p + n);
1048                 } else if (strncmp(p, "tag_info", n) == 0) {
1049                         s = ahd_parse_brace_option("tag_info", p + n, end,
1050                             2, ahd_linux_setup_tag_info, 0);
1051                 } else if (strncmp(p, "slewrate", n) == 0) {
1052                         s = ahd_parse_brace_option("slewrate",
1053                             p + n, end, 1, ahd_linux_setup_iocell_info,
1054                             AIC79XX_SLEWRATE_INDEX);
1055                 } else if (strncmp(p, "precomp", n) == 0) {
1056                         s = ahd_parse_brace_option("precomp",
1057                             p + n, end, 1, ahd_linux_setup_iocell_info,
1058                             AIC79XX_PRECOMP_INDEX);
1059                 } else if (strncmp(p, "amplitude", n) == 0) {
1060                         s = ahd_parse_brace_option("amplitude",
1061                             p + n, end, 1, ahd_linux_setup_iocell_info,
1062                             AIC79XX_AMPLITUDE_INDEX);
1063                 } else if (p[n] == ':') {
1064                         *(options[i].flag) = simple_strtoul(p + n + 1, NULL, 0);
1065                 } else if (!strncmp(p, "verbose", n)) {
1066                         *(options[i].flag) = 1;
1067                 } else {
1068                         *(options[i].flag) ^= 0xFFFFFFFF;
1069                 }
1070         }
1071         return 1;
1072 }
1073
1074 __setup("aic79xx=", aic79xx_setup);
1075
1076 uint32_t aic79xx_verbose;
1077
1078 int
1079 ahd_linux_register_host(struct ahd_softc *ahd, struct scsi_host_template *template)
1080 {
1081         char    buf[80];
1082         struct  Scsi_Host *host;
1083         char    *new_name;
1084         u_long  s;
1085         int     retval;
1086
1087         template->name = ahd->description;
1088         host = scsi_host_alloc(template, sizeof(struct ahd_softc *));
1089         if (host == NULL)
1090                 return (ENOMEM);
1091
1092         *((struct ahd_softc **)host->hostdata) = ahd;
1093         ahd->platform_data->host = host;
1094         host->can_queue = AHD_MAX_QUEUE;
1095         host->cmd_per_lun = 2;
1096         host->sg_tablesize = AHD_NSEG;
1097         host->this_id = ahd->our_id;
1098         host->irq = ahd->platform_data->irq;
1099         host->max_id = (ahd->features & AHD_WIDE) ? 16 : 8;
1100         host->max_lun = AHD_NUM_LUNS;
1101         host->max_channel = 0;
1102         host->sg_tablesize = AHD_NSEG;
1103         ahd_lock(ahd, &s);
1104         ahd_set_unit(ahd, ahd_linux_unit++);
1105         ahd_unlock(ahd, &s);
1106         sprintf(buf, "scsi%d", host->host_no);
1107         new_name = malloc(strlen(buf) + 1, M_DEVBUF, M_NOWAIT);
1108         if (new_name != NULL) {
1109                 strcpy(new_name, buf);
1110                 ahd_set_name(ahd, new_name);
1111         }
1112         host->unique_id = ahd->unit;
1113         ahd_linux_initialize_scsi_bus(ahd);
1114         ahd_intr_enable(ahd, TRUE);
1115
1116         host->transportt = ahd_linux_transport_template;
1117
1118         retval = scsi_add_host(host, &ahd->dev_softc->dev);
1119         if (retval) {
1120                 printk(KERN_WARNING "aic79xx: scsi_add_host failed\n");
1121                 scsi_host_put(host);
1122                 return retval;
1123         }
1124
1125         scsi_scan_host(host);
1126         return 0;
1127 }
1128
1129 /*
1130  * Place the SCSI bus into a known state by either resetting it,
1131  * or forcing transfer negotiations on the next command to any
1132  * target.
1133  */
1134 static void
1135 ahd_linux_initialize_scsi_bus(struct ahd_softc *ahd)
1136 {
1137         u_int target_id;
1138         u_int numtarg;
1139         unsigned long s;
1140
1141         target_id = 0;
1142         numtarg = 0;
1143
1144         if (aic79xx_no_reset != 0)
1145                 ahd->flags &= ~AHD_RESET_BUS_A;
1146
1147         if ((ahd->flags & AHD_RESET_BUS_A) != 0)
1148                 ahd_reset_channel(ahd, 'A', /*initiate_reset*/TRUE);
1149         else
1150                 numtarg = (ahd->features & AHD_WIDE) ? 16 : 8;
1151
1152         ahd_lock(ahd, &s);
1153
1154         /*
1155          * Force negotiation to async for all targets that
1156          * will not see an initial bus reset.
1157          */
1158         for (; target_id < numtarg; target_id++) {
1159                 struct ahd_devinfo devinfo;
1160                 struct ahd_initiator_tinfo *tinfo;
1161                 struct ahd_tmode_tstate *tstate;
1162
1163                 tinfo = ahd_fetch_transinfo(ahd, 'A', ahd->our_id,
1164                                             target_id, &tstate);
1165                 ahd_compile_devinfo(&devinfo, ahd->our_id, target_id,
1166                                     CAM_LUN_WILDCARD, 'A', ROLE_INITIATOR);
1167                 ahd_update_neg_request(ahd, &devinfo, tstate,
1168                                        tinfo, AHD_NEG_ALWAYS);
1169         }
1170         ahd_unlock(ahd, &s);
1171         /* Give the bus some time to recover */
1172         if ((ahd->flags & AHD_RESET_BUS_A) != 0) {
1173                 ahd_freeze_simq(ahd);
1174                 msleep(AIC79XX_RESET_DELAY);
1175                 ahd_release_simq(ahd);
1176         }
1177 }
1178
1179 int
1180 ahd_platform_alloc(struct ahd_softc *ahd, void *platform_arg)
1181 {
1182         ahd->platform_data =
1183             malloc(sizeof(struct ahd_platform_data), M_DEVBUF, M_NOWAIT);
1184         if (ahd->platform_data == NULL)
1185                 return (ENOMEM);
1186         memset(ahd->platform_data, 0, sizeof(struct ahd_platform_data));
1187         ahd->platform_data->irq = AHD_LINUX_NOIRQ;
1188         ahd_lockinit(ahd);
1189         ahd->seltime = (aic79xx_seltime & 0x3) << 4;
1190         return (0);
1191 }
1192
1193 void
1194 ahd_platform_free(struct ahd_softc *ahd)
1195 {
1196         struct scsi_target *starget;
1197         int i;
1198
1199         if (ahd->platform_data != NULL) {
1200                 /* destroy all of the device and target objects */
1201                 for (i = 0; i < AHD_NUM_TARGETS; i++) {
1202                         starget = ahd->platform_data->starget[i];
1203                         if (starget != NULL) {
1204                                 ahd->platform_data->starget[i] = NULL;
1205                         }
1206                 }
1207
1208                 if (ahd->platform_data->irq != AHD_LINUX_NOIRQ)
1209                         free_irq(ahd->platform_data->irq, ahd);
1210                 if (ahd->tags[0] == BUS_SPACE_PIO
1211                  && ahd->bshs[0].ioport != 0)
1212                         release_region(ahd->bshs[0].ioport, 256);
1213                 if (ahd->tags[1] == BUS_SPACE_PIO
1214                  && ahd->bshs[1].ioport != 0)
1215                         release_region(ahd->bshs[1].ioport, 256);
1216                 if (ahd->tags[0] == BUS_SPACE_MEMIO
1217                  && ahd->bshs[0].maddr != NULL) {
1218                         iounmap(ahd->bshs[0].maddr);
1219                         release_mem_region(ahd->platform_data->mem_busaddr,
1220                                            0x1000);
1221                 }
1222                 if (ahd->platform_data->host)
1223                         scsi_host_put(ahd->platform_data->host);
1224
1225                 free(ahd->platform_data, M_DEVBUF);
1226         }
1227 }
1228
1229 void
1230 ahd_platform_init(struct ahd_softc *ahd)
1231 {
1232         /*
1233          * Lookup and commit any modified IO Cell options.
1234          */
1235         if (ahd->unit < ARRAY_SIZE(aic79xx_iocell_info)) {
1236                 struct ahd_linux_iocell_opts *iocell_opts;
1237
1238                 iocell_opts = &aic79xx_iocell_info[ahd->unit];
1239                 if (iocell_opts->precomp != AIC79XX_DEFAULT_PRECOMP)
1240                         AHD_SET_PRECOMP(ahd, iocell_opts->precomp);
1241                 if (iocell_opts->slewrate != AIC79XX_DEFAULT_SLEWRATE)
1242                         AHD_SET_SLEWRATE(ahd, iocell_opts->slewrate);
1243                 if (iocell_opts->amplitude != AIC79XX_DEFAULT_AMPLITUDE)
1244                         AHD_SET_AMPLITUDE(ahd, iocell_opts->amplitude);
1245         }
1246
1247 }
1248
1249 void
1250 ahd_platform_freeze_devq(struct ahd_softc *ahd, struct scb *scb)
1251 {
1252         ahd_platform_abort_scbs(ahd, SCB_GET_TARGET(ahd, scb),
1253                                 SCB_GET_CHANNEL(ahd, scb),
1254                                 SCB_GET_LUN(scb), SCB_LIST_NULL,
1255                                 ROLE_UNKNOWN, CAM_REQUEUE_REQ);
1256 }
1257
1258 void
1259 ahd_platform_set_tags(struct ahd_softc *ahd, struct scsi_device *sdev,
1260                       struct ahd_devinfo *devinfo, ahd_queue_alg alg)
1261 {
1262         struct ahd_linux_device *dev;
1263         int was_queuing;
1264         int now_queuing;
1265
1266         if (sdev == NULL)
1267                 return;
1268
1269         dev = scsi_transport_device_data(sdev);
1270
1271         if (dev == NULL)
1272                 return;
1273         was_queuing = dev->flags & (AHD_DEV_Q_BASIC|AHD_DEV_Q_TAGGED);
1274         switch (alg) {
1275         default:
1276         case AHD_QUEUE_NONE:
1277                 now_queuing = 0;
1278                 break;
1279         case AHD_QUEUE_BASIC:
1280                 now_queuing = AHD_DEV_Q_BASIC;
1281                 break;
1282         case AHD_QUEUE_TAGGED:
1283                 now_queuing = AHD_DEV_Q_TAGGED;
1284                 break;
1285         }
1286         if ((dev->flags & AHD_DEV_FREEZE_TIL_EMPTY) == 0
1287          && (was_queuing != now_queuing)
1288          && (dev->active != 0)) {
1289                 dev->flags |= AHD_DEV_FREEZE_TIL_EMPTY;
1290                 dev->qfrozen++;
1291         }
1292
1293         dev->flags &= ~(AHD_DEV_Q_BASIC|AHD_DEV_Q_TAGGED|AHD_DEV_PERIODIC_OTAG);
1294         if (now_queuing) {
1295                 u_int usertags;
1296
1297                 usertags = ahd_linux_user_tagdepth(ahd, devinfo);
1298                 if (!was_queuing) {
1299                         /*
1300                          * Start out agressively and allow our
1301                          * dynamic queue depth algorithm to take
1302                          * care of the rest.
1303                          */
1304                         dev->maxtags = usertags;
1305                         dev->openings = dev->maxtags - dev->active;
1306                 }
1307                 if (dev->maxtags == 0) {
1308                         /*
1309                          * Queueing is disabled by the user.
1310                          */
1311                         dev->openings = 1;
1312                 } else if (alg == AHD_QUEUE_TAGGED) {
1313                         dev->flags |= AHD_DEV_Q_TAGGED;
1314                         if (aic79xx_periodic_otag != 0)
1315                                 dev->flags |= AHD_DEV_PERIODIC_OTAG;
1316                 } else
1317                         dev->flags |= AHD_DEV_Q_BASIC;
1318         } else {
1319                 /* We can only have one opening. */
1320                 dev->maxtags = 0;
1321                 dev->openings =  1 - dev->active;
1322         }
1323
1324         switch ((dev->flags & (AHD_DEV_Q_BASIC|AHD_DEV_Q_TAGGED))) {
1325         case AHD_DEV_Q_BASIC:
1326                 scsi_set_tag_type(sdev, MSG_SIMPLE_TASK);
1327                 scsi_activate_tcq(sdev, dev->openings + dev->active);
1328                 break;
1329         case AHD_DEV_Q_TAGGED:
1330                 scsi_set_tag_type(sdev, MSG_ORDERED_TASK);
1331                 scsi_activate_tcq(sdev, dev->openings + dev->active);
1332                 break;
1333         default:
1334                 /*
1335                  * We allow the OS to queue 2 untagged transactions to
1336                  * us at any time even though we can only execute them
1337                  * serially on the controller/device.  This should
1338                  * remove some latency.
1339                  */
1340                 scsi_deactivate_tcq(sdev, 1);
1341                 break;
1342         }
1343 }
1344
1345 int
1346 ahd_platform_abort_scbs(struct ahd_softc *ahd, int target, char channel,
1347                         int lun, u_int tag, role_t role, uint32_t status)
1348 {
1349         return 0;
1350 }
1351
1352 static u_int
1353 ahd_linux_user_tagdepth(struct ahd_softc *ahd, struct ahd_devinfo *devinfo)
1354 {
1355         static int warned_user;
1356         u_int tags;
1357
1358         tags = 0;
1359         if ((ahd->user_discenable & devinfo->target_mask) != 0) {
1360                 if (ahd->unit >= ARRAY_SIZE(aic79xx_tag_info)) {
1361
1362                         if (warned_user == 0) {
1363                                 printf(KERN_WARNING
1364 "aic79xx: WARNING: Insufficient tag_info instances\n"
1365 "aic79xx: for installed controllers.  Using defaults\n"
1366 "aic79xx: Please update the aic79xx_tag_info array in\n"
1367 "aic79xx: the aic79xx_osm.c source file.\n");
1368                                 warned_user++;
1369                         }
1370                         tags = AHD_MAX_QUEUE;
1371                 } else {
1372                         adapter_tag_info_t *tag_info;
1373
1374                         tag_info = &aic79xx_tag_info[ahd->unit];
1375                         tags = tag_info->tag_commands[devinfo->target_offset];
1376                         if (tags > AHD_MAX_QUEUE)
1377                                 tags = AHD_MAX_QUEUE;
1378                 }
1379         }
1380         return (tags);
1381 }
1382
1383 /*
1384  * Determines the queue depth for a given device.
1385  */
1386 static void
1387 ahd_linux_device_queue_depth(struct scsi_device *sdev)
1388 {
1389         struct  ahd_devinfo devinfo;
1390         u_int   tags;
1391         struct ahd_softc *ahd = *((struct ahd_softc **)sdev->host->hostdata);
1392
1393         ahd_compile_devinfo(&devinfo,
1394                             ahd->our_id,
1395                             sdev->sdev_target->id, sdev->lun,
1396                             sdev->sdev_target->channel == 0 ? 'A' : 'B',
1397                             ROLE_INITIATOR);
1398         tags = ahd_linux_user_tagdepth(ahd, &devinfo);
1399         if (tags != 0 && sdev->tagged_supported != 0) {
1400
1401                 ahd_platform_set_tags(ahd, sdev, &devinfo, AHD_QUEUE_TAGGED);
1402                 ahd_send_async(ahd, devinfo.channel, devinfo.target,
1403                                devinfo.lun, AC_TRANSFER_NEG);
1404                 ahd_print_devinfo(ahd, &devinfo);
1405                 printf("Tagged Queuing enabled.  Depth %d\n", tags);
1406         } else {
1407                 ahd_platform_set_tags(ahd, sdev, &devinfo, AHD_QUEUE_NONE);
1408                 ahd_send_async(ahd, devinfo.channel, devinfo.target,
1409                                devinfo.lun, AC_TRANSFER_NEG);
1410         }
1411 }
1412
1413 static int
1414 ahd_linux_run_command(struct ahd_softc *ahd, struct ahd_linux_device *dev,
1415                       struct scsi_cmnd *cmd)
1416 {
1417         struct   scb *scb;
1418         struct   hardware_scb *hscb;
1419         struct   ahd_initiator_tinfo *tinfo;
1420         struct   ahd_tmode_tstate *tstate;
1421         u_int    col_idx;
1422         uint16_t mask;
1423         unsigned long flags;
1424
1425         ahd_lock(ahd, &flags);
1426
1427         /*
1428          * Get an scb to use.
1429          */
1430         tinfo = ahd_fetch_transinfo(ahd, 'A', ahd->our_id,
1431                                     cmd->device->id, &tstate);
1432         if ((dev->flags & (AHD_DEV_Q_TAGGED|AHD_DEV_Q_BASIC)) == 0
1433          || (tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ) != 0) {
1434                 col_idx = AHD_NEVER_COL_IDX;
1435         } else {
1436                 col_idx = AHD_BUILD_COL_IDX(cmd->device->id,
1437                                             cmd->device->lun);
1438         }
1439         if ((scb = ahd_get_scb(ahd, col_idx)) == NULL) {
1440                 ahd->flags |= AHD_RESOURCE_SHORTAGE;
1441                 ahd_unlock(ahd, &flags);
1442                 return SCSI_MLQUEUE_HOST_BUSY;
1443         }
1444
1445         scb->io_ctx = cmd;
1446         scb->platform_data->dev = dev;
1447         hscb = scb->hscb;
1448         cmd->host_scribble = (char *)scb;
1449
1450         /*
1451          * Fill out basics of the HSCB.
1452          */
1453         hscb->control = 0;
1454         hscb->scsiid = BUILD_SCSIID(ahd, cmd);
1455         hscb->lun = cmd->device->lun;
1456         scb->hscb->task_management = 0;
1457         mask = SCB_GET_TARGET_MASK(ahd, scb);
1458
1459         if ((ahd->user_discenable & mask) != 0)
1460                 hscb->control |= DISCENB;
1461
1462         if ((tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ) != 0)
1463                 scb->flags |= SCB_PACKETIZED;
1464
1465         if ((tstate->auto_negotiate & mask) != 0) {
1466                 scb->flags |= SCB_AUTO_NEGOTIATE;
1467                 scb->hscb->control |= MK_MESSAGE;
1468         }
1469
1470         if ((dev->flags & (AHD_DEV_Q_TAGGED|AHD_DEV_Q_BASIC)) != 0) {
1471                 int     msg_bytes;
1472                 uint8_t tag_msgs[2];
1473
1474                 msg_bytes = scsi_populate_tag_msg(cmd, tag_msgs);
1475                 if (msg_bytes && tag_msgs[0] != MSG_SIMPLE_TASK) {
1476                         hscb->control |= tag_msgs[0];
1477                         if (tag_msgs[0] == MSG_ORDERED_TASK)
1478                                 dev->commands_since_idle_or_otag = 0;
1479                 } else
1480                 if (dev->commands_since_idle_or_otag == AHD_OTAG_THRESH
1481                  && (dev->flags & AHD_DEV_Q_TAGGED) != 0) {
1482                         hscb->control |= MSG_ORDERED_TASK;
1483                         dev->commands_since_idle_or_otag = 0;
1484                 } else {
1485                         hscb->control |= MSG_SIMPLE_TASK;
1486                 }
1487         }
1488
1489         hscb->cdb_len = cmd->cmd_len;
1490         memcpy(hscb->shared_data.idata.cdb, cmd->cmnd, hscb->cdb_len);
1491
1492         scb->platform_data->xfer_len = 0;
1493         ahd_set_residual(scb, 0);
1494         ahd_set_sense_residual(scb, 0);
1495         scb->sg_count = 0;
1496         if (cmd->use_sg != 0) {
1497                 void    *sg;
1498                 struct   scatterlist *cur_seg;
1499                 u_int    nseg;
1500                 int      dir;
1501
1502                 cur_seg = (struct scatterlist *)cmd->request_buffer;
1503                 dir = cmd->sc_data_direction;
1504                 nseg = pci_map_sg(ahd->dev_softc, cur_seg,
1505                                   cmd->use_sg, dir);
1506                 scb->platform_data->xfer_len = 0;
1507                 for (sg = scb->sg_list; nseg > 0; nseg--, cur_seg++) {
1508                         dma_addr_t addr;
1509                         bus_size_t len;
1510
1511                         addr = sg_dma_address(cur_seg);
1512                         len = sg_dma_len(cur_seg);
1513                         scb->platform_data->xfer_len += len;
1514                         sg = ahd_sg_setup(ahd, scb, sg, addr, len,
1515                                           /*last*/nseg == 1);
1516                 }
1517         } else if (cmd->request_bufflen != 0) {
1518                 void *sg;
1519                 dma_addr_t addr;
1520                 int dir;
1521
1522                 sg = scb->sg_list;
1523                 dir = cmd->sc_data_direction;
1524                 addr = pci_map_single(ahd->dev_softc,
1525                                       cmd->request_buffer,
1526                                       cmd->request_bufflen, dir);
1527                 scb->platform_data->xfer_len = cmd->request_bufflen;
1528                 scb->platform_data->buf_busaddr = addr;
1529                 sg = ahd_sg_setup(ahd, scb, sg, addr,
1530                                   cmd->request_bufflen, /*last*/TRUE);
1531         }
1532
1533         LIST_INSERT_HEAD(&ahd->pending_scbs, scb, pending_links);
1534         dev->openings--;
1535         dev->active++;
1536         dev->commands_issued++;
1537
1538         if ((dev->flags & AHD_DEV_PERIODIC_OTAG) != 0)
1539                 dev->commands_since_idle_or_otag++;
1540         scb->flags |= SCB_ACTIVE;
1541         ahd_queue_scb(ahd, scb);
1542
1543         ahd_unlock(ahd, &flags);
1544
1545         return 0;
1546 }
1547
1548 /*
1549  * SCSI controller interrupt handler.
1550  */
1551 irqreturn_t
1552 ahd_linux_isr(int irq, void *dev_id)
1553 {
1554         struct  ahd_softc *ahd;
1555         u_long  flags;
1556         int     ours;
1557
1558         ahd = (struct ahd_softc *) dev_id;
1559         ahd_lock(ahd, &flags);
1560         ours = ahd_intr(ahd);
1561         ahd_unlock(ahd, &flags);
1562         return IRQ_RETVAL(ours);
1563 }
1564
1565 void
1566 ahd_send_async(struct ahd_softc *ahd, char channel,
1567                u_int target, u_int lun, ac_code code)
1568 {
1569         switch (code) {
1570         case AC_TRANSFER_NEG:
1571         {
1572                 char    buf[80];
1573                 struct  scsi_target *starget;
1574                 struct  info_str info;
1575                 struct  ahd_initiator_tinfo *tinfo;
1576                 struct  ahd_tmode_tstate *tstate;
1577                 unsigned int target_ppr_options;
1578
1579                 BUG_ON(target == CAM_TARGET_WILDCARD);
1580
1581                 info.buffer = buf;
1582                 info.length = sizeof(buf);
1583                 info.offset = 0;
1584                 info.pos = 0;
1585                 tinfo = ahd_fetch_transinfo(ahd, channel, ahd->our_id,
1586                                             target, &tstate);
1587
1588                 /*
1589                  * Don't bother reporting results while
1590                  * negotiations are still pending.
1591                  */
1592                 if (tinfo->curr.period != tinfo->goal.period
1593                  || tinfo->curr.width != tinfo->goal.width
1594                  || tinfo->curr.offset != tinfo->goal.offset
1595                  || tinfo->curr.ppr_options != tinfo->goal.ppr_options)
1596                         if (bootverbose == 0)
1597                                 break;
1598
1599                 /*
1600                  * Don't bother reporting results that
1601                  * are identical to those last reported.
1602                  */
1603                 starget = ahd->platform_data->starget[target];
1604                 if (starget == NULL)
1605                         break;
1606
1607                 target_ppr_options =
1608                         (spi_dt(starget) ? MSG_EXT_PPR_DT_REQ : 0)
1609                         + (spi_qas(starget) ? MSG_EXT_PPR_QAS_REQ : 0)
1610                         + (spi_iu(starget) ?  MSG_EXT_PPR_IU_REQ : 0)
1611                         + (spi_rd_strm(starget) ? MSG_EXT_PPR_RD_STRM : 0)
1612                         + (spi_pcomp_en(starget) ? MSG_EXT_PPR_PCOMP_EN : 0)
1613                         + (spi_rti(starget) ? MSG_EXT_PPR_RTI : 0)
1614                         + (spi_wr_flow(starget) ? MSG_EXT_PPR_WR_FLOW : 0)
1615                         + (spi_hold_mcs(starget) ? MSG_EXT_PPR_HOLD_MCS : 0);
1616
1617                 if (tinfo->curr.period == spi_period(starget)
1618                     && tinfo->curr.width == spi_width(starget)
1619                     && tinfo->curr.offset == spi_offset(starget)
1620                  && tinfo->curr.ppr_options == target_ppr_options)
1621                         if (bootverbose == 0)
1622                                 break;
1623
1624                 spi_period(starget) = tinfo->curr.period;
1625                 spi_width(starget) = tinfo->curr.width;
1626                 spi_offset(starget) = tinfo->curr.offset;
1627                 spi_dt(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_DT_REQ ? 1 : 0;
1628                 spi_qas(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_QAS_REQ ? 1 : 0;
1629                 spi_iu(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ ? 1 : 0;
1630                 spi_rd_strm(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_RD_STRM ? 1 : 0;
1631                 spi_pcomp_en(starget) =  tinfo->curr.ppr_options & MSG_EXT_PPR_PCOMP_EN ? 1 : 0;
1632                 spi_rti(starget) =  tinfo->curr.ppr_options &  MSG_EXT_PPR_RTI ? 1 : 0;
1633                 spi_wr_flow(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_WR_FLOW ? 1 : 0;
1634                 spi_hold_mcs(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_HOLD_MCS ? 1 : 0;
1635                 spi_display_xfer_agreement(starget);
1636                 break;
1637         }
1638         case AC_SENT_BDR:
1639         {
1640                 WARN_ON(lun != CAM_LUN_WILDCARD);
1641                 scsi_report_device_reset(ahd->platform_data->host,
1642                                          channel - 'A', target);
1643                 break;
1644         }
1645         case AC_BUS_RESET:
1646                 if (ahd->platform_data->host != NULL) {
1647                         scsi_report_bus_reset(ahd->platform_data->host,
1648                                               channel - 'A');
1649                 }
1650                 break;
1651         default:
1652                 panic("ahd_send_async: Unexpected async event");
1653         }
1654 }
1655
1656 /*
1657  * Calls the higher level scsi done function and frees the scb.
1658  */
1659 void
1660 ahd_done(struct ahd_softc *ahd, struct scb *scb)
1661 {
1662         struct scsi_cmnd *cmd;
1663         struct    ahd_linux_device *dev;
1664
1665         if ((scb->flags & SCB_ACTIVE) == 0) {
1666                 printf("SCB %d done'd twice\n", SCB_GET_TAG(scb));
1667                 ahd_dump_card_state(ahd);
1668                 panic("Stopping for safety");
1669         }
1670         LIST_REMOVE(scb, pending_links);
1671         cmd = scb->io_ctx;
1672         dev = scb->platform_data->dev;
1673         dev->active--;
1674         dev->openings++;
1675         if ((cmd->result & (CAM_DEV_QFRZN << 16)) != 0) {
1676                 cmd->result &= ~(CAM_DEV_QFRZN << 16);
1677                 dev->qfrozen--;
1678         }
1679         ahd_linux_unmap_scb(ahd, scb);
1680
1681         /*
1682          * Guard against stale sense data.
1683          * The Linux mid-layer assumes that sense
1684          * was retrieved anytime the first byte of
1685          * the sense buffer looks "sane".
1686          */
1687         cmd->sense_buffer[0] = 0;
1688         if (ahd_get_transaction_status(scb) == CAM_REQ_INPROG) {
1689                 uint32_t amount_xferred;
1690
1691                 amount_xferred =
1692                     ahd_get_transfer_length(scb) - ahd_get_residual(scb);
1693                 if ((scb->flags & SCB_TRANSMISSION_ERROR) != 0) {
1694 #ifdef AHD_DEBUG
1695                         if ((ahd_debug & AHD_SHOW_MISC) != 0) {
1696                                 ahd_print_path(ahd, scb);
1697                                 printf("Set CAM_UNCOR_PARITY\n");
1698                         }
1699 #endif
1700                         ahd_set_transaction_status(scb, CAM_UNCOR_PARITY);
1701 #ifdef AHD_REPORT_UNDERFLOWS
1702                 /*
1703                  * This code is disabled by default as some
1704                  * clients of the SCSI system do not properly
1705                  * initialize the underflow parameter.  This
1706                  * results in spurious termination of commands
1707                  * that complete as expected (e.g. underflow is
1708                  * allowed as command can return variable amounts
1709                  * of data.
1710                  */
1711                 } else if (amount_xferred < scb->io_ctx->underflow) {
1712                         u_int i;
1713
1714                         ahd_print_path(ahd, scb);
1715                         printf("CDB:");
1716                         for (i = 0; i < scb->io_ctx->cmd_len; i++)
1717                                 printf(" 0x%x", scb->io_ctx->cmnd[i]);
1718                         printf("\n");
1719                         ahd_print_path(ahd, scb);
1720                         printf("Saw underflow (%ld of %ld bytes). "
1721                                "Treated as error\n",
1722                                 ahd_get_residual(scb),
1723                                 ahd_get_transfer_length(scb));
1724                         ahd_set_transaction_status(scb, CAM_DATA_RUN_ERR);
1725 #endif
1726                 } else {
1727                         ahd_set_transaction_status(scb, CAM_REQ_CMP);
1728                 }
1729         } else if (ahd_get_transaction_status(scb) == CAM_SCSI_STATUS_ERROR) {
1730                 ahd_linux_handle_scsi_status(ahd, cmd->device, scb);
1731         }
1732
1733         if (dev->openings == 1
1734          && ahd_get_transaction_status(scb) == CAM_REQ_CMP
1735          && ahd_get_scsi_status(scb) != SCSI_STATUS_QUEUE_FULL)
1736                 dev->tag_success_count++;
1737         /*
1738          * Some devices deal with temporary internal resource
1739          * shortages by returning queue full.  When the queue
1740          * full occurrs, we throttle back.  Slowly try to get
1741          * back to our previous queue depth.
1742          */
1743         if ((dev->openings + dev->active) < dev->maxtags
1744          && dev->tag_success_count > AHD_TAG_SUCCESS_INTERVAL) {
1745                 dev->tag_success_count = 0;
1746                 dev->openings++;
1747         }
1748
1749         if (dev->active == 0)
1750                 dev->commands_since_idle_or_otag = 0;
1751
1752         if ((scb->flags & SCB_RECOVERY_SCB) != 0) {
1753                 printf("Recovery SCB completes\n");
1754                 if (ahd_get_transaction_status(scb) == CAM_BDR_SENT
1755                  || ahd_get_transaction_status(scb) == CAM_REQ_ABORTED)
1756                         ahd_set_transaction_status(scb, CAM_CMD_TIMEOUT);
1757
1758                 if (ahd->platform_data->eh_done)
1759                         complete(ahd->platform_data->eh_done);
1760         }
1761
1762         ahd_free_scb(ahd, scb);
1763         ahd_linux_queue_cmd_complete(ahd, cmd);
1764 }
1765
1766 static void
1767 ahd_linux_handle_scsi_status(struct ahd_softc *ahd,
1768                              struct scsi_device *sdev, struct scb *scb)
1769 {
1770         struct  ahd_devinfo devinfo;
1771         struct ahd_linux_device *dev = scsi_transport_device_data(sdev);
1772
1773         ahd_compile_devinfo(&devinfo,
1774                             ahd->our_id,
1775                             sdev->sdev_target->id, sdev->lun,
1776                             sdev->sdev_target->channel == 0 ? 'A' : 'B',
1777                             ROLE_INITIATOR);
1778
1779         /*
1780          * We don't currently trust the mid-layer to
1781          * properly deal with queue full or busy.  So,
1782          * when one occurs, we tell the mid-layer to
1783          * unconditionally requeue the command to us
1784          * so that we can retry it ourselves.  We also
1785          * implement our own throttling mechanism so
1786          * we don't clobber the device with too many
1787          * commands.
1788          */
1789         switch (ahd_get_scsi_status(scb)) {
1790         default:
1791                 break;
1792         case SCSI_STATUS_CHECK_COND:
1793         case SCSI_STATUS_CMD_TERMINATED:
1794         {
1795                 struct scsi_cmnd *cmd;
1796
1797                 /*
1798                  * Copy sense information to the OS's cmd
1799                  * structure if it is available.
1800                  */
1801                 cmd = scb->io_ctx;
1802                 if ((scb->flags & (SCB_SENSE|SCB_PKT_SENSE)) != 0) {
1803                         struct scsi_status_iu_header *siu;
1804                         u_int sense_size;
1805                         u_int sense_offset;
1806
1807                         if (scb->flags & SCB_SENSE) {
1808                                 sense_size = min(sizeof(struct scsi_sense_data)
1809                                                - ahd_get_sense_residual(scb),
1810                                                  (u_long)sizeof(cmd->sense_buffer));
1811                                 sense_offset = 0;
1812                         } else {
1813                                 /*
1814                                  * Copy only the sense data into the provided
1815                                  * buffer.
1816                                  */
1817                                 siu = (struct scsi_status_iu_header *)
1818                                     scb->sense_data;
1819                                 sense_size = min_t(size_t,
1820                                                 scsi_4btoul(siu->sense_length),
1821                                                 sizeof(cmd->sense_buffer));
1822                                 sense_offset = SIU_SENSE_OFFSET(siu);
1823                         }
1824
1825                         memset(cmd->sense_buffer, 0, sizeof(cmd->sense_buffer));
1826                         memcpy(cmd->sense_buffer,
1827                                ahd_get_sense_buf(ahd, scb)
1828                                + sense_offset, sense_size);
1829                         cmd->result |= (DRIVER_SENSE << 24);
1830
1831 #ifdef AHD_DEBUG
1832                         if (ahd_debug & AHD_SHOW_SENSE) {
1833                                 int i;
1834
1835                                 printf("Copied %d bytes of sense data at %d:",
1836                                        sense_size, sense_offset);
1837                                 for (i = 0; i < sense_size; i++) {
1838                                         if ((i & 0xF) == 0)
1839                                                 printf("\n");
1840                                         printf("0x%x ", cmd->sense_buffer[i]);
1841                                 }
1842                                 printf("\n");
1843                         }
1844 #endif
1845                 }
1846                 break;
1847         }
1848         case SCSI_STATUS_QUEUE_FULL:
1849                 /*
1850                  * By the time the core driver has returned this
1851                  * command, all other commands that were queued
1852                  * to us but not the device have been returned.
1853                  * This ensures that dev->active is equal to
1854                  * the number of commands actually queued to
1855                  * the device.
1856                  */
1857                 dev->tag_success_count = 0;
1858                 if (dev->active != 0) {
1859                         /*
1860                          * Drop our opening count to the number
1861                          * of commands currently outstanding.
1862                          */
1863                         dev->openings = 0;
1864 #ifdef AHD_DEBUG
1865                         if ((ahd_debug & AHD_SHOW_QFULL) != 0) {
1866                                 ahd_print_path(ahd, scb);
1867                                 printf("Dropping tag count to %d\n",
1868                                        dev->active);
1869                         }
1870 #endif
1871                         if (dev->active == dev->tags_on_last_queuefull) {
1872
1873                                 dev->last_queuefull_same_count++;
1874                                 /*
1875                                  * If we repeatedly see a queue full
1876                                  * at the same queue depth, this
1877                                  * device has a fixed number of tag
1878                                  * slots.  Lock in this tag depth
1879                                  * so we stop seeing queue fulls from
1880                                  * this device.
1881                                  */
1882                                 if (dev->last_queuefull_same_count
1883                                  == AHD_LOCK_TAGS_COUNT) {
1884                                         dev->maxtags = dev->active;
1885                                         ahd_print_path(ahd, scb);
1886                                         printf("Locking max tag count at %d\n",
1887                                                dev->active);
1888                                 }
1889                         } else {
1890                                 dev->tags_on_last_queuefull = dev->active;
1891                                 dev->last_queuefull_same_count = 0;
1892                         }
1893                         ahd_set_transaction_status(scb, CAM_REQUEUE_REQ);
1894                         ahd_set_scsi_status(scb, SCSI_STATUS_OK);
1895                         ahd_platform_set_tags(ahd, sdev, &devinfo,
1896                                      (dev->flags & AHD_DEV_Q_BASIC)
1897                                    ? AHD_QUEUE_BASIC : AHD_QUEUE_TAGGED);
1898                         break;
1899                 }
1900                 /*
1901                  * Drop down to a single opening, and treat this
1902                  * as if the target returned BUSY SCSI status.
1903                  */
1904                 dev->openings = 1;
1905                 ahd_platform_set_tags(ahd, sdev, &devinfo,
1906                              (dev->flags & AHD_DEV_Q_BASIC)
1907                            ? AHD_QUEUE_BASIC : AHD_QUEUE_TAGGED);
1908                 ahd_set_scsi_status(scb, SCSI_STATUS_BUSY);
1909         }
1910 }
1911
1912 static void
1913 ahd_linux_queue_cmd_complete(struct ahd_softc *ahd, struct scsi_cmnd *cmd)
1914 {
1915         int status;
1916         int new_status = DID_OK;
1917         int do_fallback = 0;
1918         int scsi_status;
1919
1920         /*
1921          * Map CAM error codes into Linux Error codes.  We
1922          * avoid the conversion so that the DV code has the
1923          * full error information available when making
1924          * state change decisions.
1925          */
1926
1927         status = ahd_cmd_get_transaction_status(cmd);
1928         switch (status) {
1929         case CAM_REQ_INPROG:
1930         case CAM_REQ_CMP:
1931                 new_status = DID_OK;
1932                 break;
1933         case CAM_AUTOSENSE_FAIL:
1934                 new_status = DID_ERROR;
1935                 /* Fallthrough */
1936         case CAM_SCSI_STATUS_ERROR:
1937                 scsi_status = ahd_cmd_get_scsi_status(cmd);
1938
1939                 switch(scsi_status) {
1940                 case SCSI_STATUS_CMD_TERMINATED:
1941                 case SCSI_STATUS_CHECK_COND:
1942                         if ((cmd->result >> 24) != DRIVER_SENSE) {
1943                                 do_fallback = 1;
1944                         } else {
1945                                 struct scsi_sense_data *sense;
1946
1947                                 sense = (struct scsi_sense_data *)
1948                                         &cmd->sense_buffer;
1949                                 if (sense->extra_len >= 5 &&
1950                                     (sense->add_sense_code == 0x47
1951                                      || sense->add_sense_code == 0x48))
1952                                         do_fallback = 1;
1953                         }
1954                         break;
1955                 default:
1956                         break;
1957                 }
1958                 break;
1959         case CAM_REQ_ABORTED:
1960                 new_status = DID_ABORT;
1961                 break;
1962         case CAM_BUSY:
1963                 new_status = DID_BUS_BUSY;
1964                 break;
1965         case CAM_REQ_INVALID:
1966         case CAM_PATH_INVALID:
1967                 new_status = DID_BAD_TARGET;
1968                 break;
1969         case CAM_SEL_TIMEOUT:
1970                 new_status = DID_NO_CONNECT;
1971                 break;
1972         case CAM_SCSI_BUS_RESET:
1973         case CAM_BDR_SENT:
1974                 new_status = DID_RESET;
1975                 break;
1976         case CAM_UNCOR_PARITY:
1977                 new_status = DID_PARITY;
1978                 do_fallback = 1;
1979                 break;
1980         case CAM_CMD_TIMEOUT:
1981                 new_status = DID_TIME_OUT;
1982                 do_fallback = 1;
1983                 break;
1984         case CAM_REQ_CMP_ERR:
1985         case CAM_UNEXP_BUSFREE:
1986         case CAM_DATA_RUN_ERR:
1987                 new_status = DID_ERROR;
1988                 do_fallback = 1;
1989                 break;
1990         case CAM_UA_ABORT:
1991         case CAM_NO_HBA:
1992         case CAM_SEQUENCE_FAIL:
1993         case CAM_CCB_LEN_ERR:
1994         case CAM_PROVIDE_FAIL:
1995         case CAM_REQ_TERMIO:
1996         case CAM_UNREC_HBA_ERROR:
1997         case CAM_REQ_TOO_BIG:
1998                 new_status = DID_ERROR;
1999                 break;
2000         case CAM_REQUEUE_REQ:
2001                 new_status = DID_REQUEUE;
2002                 break;
2003         default:
2004                 /* We should never get here */
2005                 new_status = DID_ERROR;
2006                 break;
2007         }
2008
2009         if (do_fallback) {
2010                 printf("%s: device overrun (status %x) on %d:%d:%d\n",
2011                        ahd_name(ahd), status, cmd->device->channel,
2012                        cmd->device->id, cmd->device->lun);
2013         }
2014
2015         ahd_cmd_set_transaction_status(cmd, new_status);
2016
2017         cmd->scsi_done(cmd);
2018 }
2019
2020 void
2021 ahd_freeze_simq(struct ahd_softc *ahd)
2022 {
2023         scsi_block_requests(ahd->platform_data->host);
2024 }
2025
2026 void
2027 ahd_release_simq(struct ahd_softc *ahd)
2028 {
2029         scsi_unblock_requests(ahd->platform_data->host);
2030 }
2031
2032 static int
2033 ahd_linux_queue_abort_cmd(struct scsi_cmnd *cmd)
2034 {
2035         struct ahd_softc *ahd;
2036         struct ahd_linux_device *dev;
2037         struct scb *pending_scb;
2038         u_int  saved_scbptr;
2039         u_int  active_scbptr;
2040         u_int  last_phase;
2041         u_int  saved_scsiid;
2042         u_int  cdb_byte;
2043         int    retval;
2044         int    was_paused;
2045         int    paused;
2046         int    wait;
2047         int    disconnected;
2048         ahd_mode_state saved_modes;
2049         unsigned long flags;
2050
2051         pending_scb = NULL;
2052         paused = FALSE;
2053         wait = FALSE;
2054         ahd = *(struct ahd_softc **)cmd->device->host->hostdata;
2055
2056         scmd_printk(KERN_INFO, cmd,
2057                     "Attempting to queue an ABORT message:");
2058
2059         printf("CDB:");
2060         for (cdb_byte = 0; cdb_byte < cmd->cmd_len; cdb_byte++)
2061                 printf(" 0x%x", cmd->cmnd[cdb_byte]);
2062         printf("\n");
2063
2064         ahd_lock(ahd, &flags);
2065
2066         /*
2067          * First determine if we currently own this command.
2068          * Start by searching the device queue.  If not found
2069          * there, check the pending_scb list.  If not found
2070          * at all, and the system wanted us to just abort the
2071          * command, return success.
2072          */
2073         dev = scsi_transport_device_data(cmd->device);
2074
2075         if (dev == NULL) {
2076                 /*
2077                  * No target device for this command exists,
2078                  * so we must not still own the command.
2079                  */
2080                 scmd_printk(KERN_INFO, cmd, "Is not an active device\n");
2081                 retval = SUCCESS;
2082                 goto no_cmd;
2083         }
2084
2085         /*
2086          * See if we can find a matching cmd in the pending list.
2087          */
2088         LIST_FOREACH(pending_scb, &ahd->pending_scbs, pending_links) {
2089                 if (pending_scb->io_ctx == cmd)
2090                         break;
2091         }
2092
2093         if (pending_scb == NULL) {
2094                 scmd_printk(KERN_INFO, cmd, "Command not found\n");
2095                 goto no_cmd;
2096         }
2097
2098         if ((pending_scb->flags & SCB_RECOVERY_SCB) != 0) {
2099                 /*
2100                  * We can't queue two recovery actions using the same SCB
2101                  */
2102                 retval = FAILED;
2103                 goto  done;
2104         }
2105
2106         /*
2107          * Ensure that the card doesn't do anything
2108          * behind our back.  Also make sure that we
2109          * didn't "just" miss an interrupt that would
2110          * affect this cmd.
2111          */
2112         was_paused = ahd_is_paused(ahd);
2113         ahd_pause_and_flushwork(ahd);
2114         paused = TRUE;
2115
2116         if ((pending_scb->flags & SCB_ACTIVE) == 0) {
2117                 scmd_printk(KERN_INFO, cmd, "Command already completed\n");
2118                 goto no_cmd;
2119         }
2120
2121         printf("%s: At time of recovery, card was %spaused\n",
2122                ahd_name(ahd), was_paused ? "" : "not ");
2123         ahd_dump_card_state(ahd);
2124
2125         disconnected = TRUE;
2126         if (ahd_search_qinfifo(ahd, cmd->device->id,
2127                                cmd->device->channel + 'A',
2128                                cmd->device->lun,
2129                                pending_scb->hscb->tag,
2130                                ROLE_INITIATOR, CAM_REQ_ABORTED,
2131                                SEARCH_COMPLETE) > 0) {
2132                 printf("%s:%d:%d:%d: Cmd aborted from QINFIFO\n",
2133                        ahd_name(ahd), cmd->device->channel,
2134                        cmd->device->id, cmd->device->lun);
2135                 retval = SUCCESS;
2136                 goto done;
2137         }
2138
2139         saved_modes = ahd_save_modes(ahd);
2140         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
2141         last_phase = ahd_inb(ahd, LASTPHASE);
2142         saved_scbptr = ahd_get_scbptr(ahd);
2143         active_scbptr = saved_scbptr;
2144         if (disconnected && (ahd_inb(ahd, SEQ_FLAGS) & NOT_IDENTIFIED) == 0) {
2145                 struct scb *bus_scb;
2146
2147                 bus_scb = ahd_lookup_scb(ahd, active_scbptr);
2148                 if (bus_scb == pending_scb)
2149                         disconnected = FALSE;
2150         }
2151
2152         /*
2153          * At this point, pending_scb is the scb associated with the
2154          * passed in command.  That command is currently active on the
2155          * bus or is in the disconnected state.
2156          */
2157         saved_scsiid = ahd_inb(ahd, SAVED_SCSIID);
2158         if (last_phase != P_BUSFREE
2159             && SCB_GET_TAG(pending_scb) == active_scbptr) {
2160
2161                 /*
2162                  * We're active on the bus, so assert ATN
2163                  * and hope that the target responds.
2164                  */
2165                 pending_scb = ahd_lookup_scb(ahd, active_scbptr);
2166                 pending_scb->flags |= SCB_RECOVERY_SCB|SCB_ABORT;
2167                 ahd_outb(ahd, MSG_OUT, HOST_MSG);
2168                 ahd_outb(ahd, SCSISIGO, last_phase|ATNO);
2169                 scmd_printk(KERN_INFO, cmd, "Device is active, asserting ATN\n");
2170                 wait = TRUE;
2171         } else if (disconnected) {
2172
2173                 /*
2174                  * Actually re-queue this SCB in an attempt
2175                  * to select the device before it reconnects.
2176                  */
2177                 pending_scb->flags |= SCB_RECOVERY_SCB|SCB_ABORT;
2178                 ahd_set_scbptr(ahd, SCB_GET_TAG(pending_scb));
2179                 pending_scb->hscb->cdb_len = 0;
2180                 pending_scb->hscb->task_attribute = 0;
2181                 pending_scb->hscb->task_management = SIU_TASKMGMT_ABORT_TASK;
2182
2183                 if ((pending_scb->flags & SCB_PACKETIZED) != 0) {
2184                         /*
2185                          * Mark the SCB has having an outstanding
2186                          * task management function.  Should the command
2187                          * complete normally before the task management
2188                          * function can be sent, the host will be notified
2189                          * to abort our requeued SCB.
2190                          */
2191                         ahd_outb(ahd, SCB_TASK_MANAGEMENT,
2192                                  pending_scb->hscb->task_management);
2193                 } else {
2194                         /*
2195                          * If non-packetized, set the MK_MESSAGE control
2196                          * bit indicating that we desire to send a message.
2197                          * We also set the disconnected flag since there is
2198                          * no guarantee that our SCB control byte matches
2199                          * the version on the card.  We don't want the
2200                          * sequencer to abort the command thinking an
2201                          * unsolicited reselection occurred.
2202                          */
2203                         pending_scb->hscb->control |= MK_MESSAGE|DISCONNECTED;
2204
2205                         /*
2206                          * The sequencer will never re-reference the
2207                          * in-core SCB.  To make sure we are notified
2208                          * during reslection, set the MK_MESSAGE flag in
2209                          * the card's copy of the SCB.
2210                          */
2211                         ahd_outb(ahd, SCB_CONTROL,
2212                                  ahd_inb(ahd, SCB_CONTROL)|MK_MESSAGE);
2213                 }
2214
2215                 /*
2216                  * Clear out any entries in the QINFIFO first
2217                  * so we are the next SCB for this target
2218                  * to run.
2219                  */
2220                 ahd_search_qinfifo(ahd, cmd->device->id,
2221                                    cmd->device->channel + 'A', cmd->device->lun,
2222                                    SCB_LIST_NULL, ROLE_INITIATOR,
2223                                    CAM_REQUEUE_REQ, SEARCH_COMPLETE);
2224                 ahd_qinfifo_requeue_tail(ahd, pending_scb);
2225                 ahd_set_scbptr(ahd, saved_scbptr);
2226                 ahd_print_path(ahd, pending_scb);
2227                 printf("Device is disconnected, re-queuing SCB\n");
2228                 wait = TRUE;
2229         } else {
2230                 scmd_printk(KERN_INFO, cmd, "Unable to deliver message\n");
2231                 retval = FAILED;
2232                 goto done;
2233         }
2234
2235 no_cmd:
2236         /*
2237          * Our assumption is that if we don't have the command, no
2238          * recovery action was required, so we return success.  Again,
2239          * the semantics of the mid-layer recovery engine are not
2240          * well defined, so this may change in time.
2241          */
2242         retval = SUCCESS;
2243 done:
2244         if (paused)
2245                 ahd_unpause(ahd);
2246         if (wait) {
2247                 DECLARE_COMPLETION_ONSTACK(done);
2248
2249                 ahd->platform_data->eh_done = &done;
2250                 ahd_unlock(ahd, &flags);
2251
2252                 printf("%s: Recovery code sleeping\n", ahd_name(ahd));
2253                 if (!wait_for_completion_timeout(&done, 5 * HZ)) {
2254                         ahd_lock(ahd, &flags);
2255                         ahd->platform_data->eh_done = NULL;
2256                         ahd_unlock(ahd, &flags);
2257                         printf("%s: Timer Expired (active %d)\n",
2258                                ahd_name(ahd), dev->active);
2259                         retval = FAILED;
2260                 }
2261                 printf("Recovery code awake\n");
2262         } else
2263                 ahd_unlock(ahd, &flags);
2264
2265         if (retval != SUCCESS)
2266                 printf("%s: Command abort returning 0x%x\n",
2267                        ahd_name(ahd), retval);
2268
2269         return retval;
2270 }
2271
2272 static void ahd_linux_set_width(struct scsi_target *starget, int width)
2273 {
2274         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2275         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2276         struct ahd_devinfo devinfo;
2277         unsigned long flags;
2278
2279         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2280                             starget->channel + 'A', ROLE_INITIATOR);
2281         ahd_lock(ahd, &flags);
2282         ahd_set_width(ahd, &devinfo, width, AHD_TRANS_GOAL, FALSE);
2283         ahd_unlock(ahd, &flags);
2284 }
2285
2286 static void ahd_linux_set_period(struct scsi_target *starget, int period)
2287 {
2288         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2289         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2290         struct ahd_tmode_tstate *tstate;
2291         struct ahd_initiator_tinfo *tinfo
2292                 = ahd_fetch_transinfo(ahd,
2293                                       starget->channel + 'A',
2294                                       shost->this_id, starget->id, &tstate);
2295         struct ahd_devinfo devinfo;
2296         unsigned int ppr_options = tinfo->goal.ppr_options;
2297         unsigned int dt;
2298         unsigned long flags;
2299         unsigned long offset = tinfo->goal.offset;
2300
2301 #ifdef AHD_DEBUG
2302         if ((ahd_debug & AHD_SHOW_DV) != 0)
2303                 printf("%s: set period to %d\n", ahd_name(ahd), period);
2304 #endif
2305         if (offset == 0)
2306                 offset = MAX_OFFSET;
2307
2308         if (period < 8)
2309                 period = 8;
2310         if (period < 10) {
2311                 ppr_options |= MSG_EXT_PPR_DT_REQ;
2312                 if (period == 8)
2313                         ppr_options |= MSG_EXT_PPR_IU_REQ;
2314         }
2315
2316         dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2317
2318         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2319                             starget->channel + 'A', ROLE_INITIATOR);
2320
2321         /* all PPR requests apart from QAS require wide transfers */
2322         if (ppr_options & ~MSG_EXT_PPR_QAS_REQ) {
2323                 if (spi_width(starget) == 0)
2324                         ppr_options &= MSG_EXT_PPR_QAS_REQ;
2325         }
2326
2327         ahd_find_syncrate(ahd, &period, &ppr_options,
2328                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2329
2330         ahd_lock(ahd, &flags);
2331         ahd_set_syncrate(ahd, &devinfo, period, offset,
2332                          ppr_options, AHD_TRANS_GOAL, FALSE);
2333         ahd_unlock(ahd, &flags);
2334 }
2335
2336 static void ahd_linux_set_offset(struct scsi_target *starget, int offset)
2337 {
2338         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2339         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2340         struct ahd_tmode_tstate *tstate;
2341         struct ahd_initiator_tinfo *tinfo
2342                 = ahd_fetch_transinfo(ahd,
2343                                       starget->channel + 'A',
2344                                       shost->this_id, starget->id, &tstate);
2345         struct ahd_devinfo devinfo;
2346         unsigned int ppr_options = 0;
2347         unsigned int period = 0;
2348         unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2349         unsigned long flags;
2350
2351 #ifdef AHD_DEBUG
2352         if ((ahd_debug & AHD_SHOW_DV) != 0)
2353                 printf("%s: set offset to %d\n", ahd_name(ahd), offset);
2354 #endif
2355
2356         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2357                             starget->channel + 'A', ROLE_INITIATOR);
2358         if (offset != 0) {
2359                 period = tinfo->goal.period;
2360                 ppr_options = tinfo->goal.ppr_options;
2361                 ahd_find_syncrate(ahd, &period, &ppr_options,
2362                                   dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2363         }
2364
2365         ahd_lock(ahd, &flags);
2366         ahd_set_syncrate(ahd, &devinfo, period, offset, ppr_options,
2367                          AHD_TRANS_GOAL, FALSE);
2368         ahd_unlock(ahd, &flags);
2369 }
2370
2371 static void ahd_linux_set_dt(struct scsi_target *starget, int dt)
2372 {
2373         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2374         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2375         struct ahd_tmode_tstate *tstate;
2376         struct ahd_initiator_tinfo *tinfo
2377                 = ahd_fetch_transinfo(ahd,
2378                                       starget->channel + 'A',
2379                                       shost->this_id, starget->id, &tstate);
2380         struct ahd_devinfo devinfo;
2381         unsigned int ppr_options = tinfo->goal.ppr_options
2382                 & ~MSG_EXT_PPR_DT_REQ;
2383         unsigned int period = tinfo->goal.period;
2384         unsigned int width = tinfo->goal.width;
2385         unsigned long flags;
2386
2387 #ifdef AHD_DEBUG
2388         if ((ahd_debug & AHD_SHOW_DV) != 0)
2389                 printf("%s: %s DT\n", ahd_name(ahd),
2390                        dt ? "enabling" : "disabling");
2391 #endif
2392         if (dt) {
2393                 ppr_options |= MSG_EXT_PPR_DT_REQ;
2394                 if (!width)
2395                         ahd_linux_set_width(starget, 1);
2396         } else {
2397                 if (period <= 9)
2398                         period = 10; /* If resetting DT, period must be >= 25ns */
2399                 /* IU is invalid without DT set */
2400                 ppr_options &= ~MSG_EXT_PPR_IU_REQ;
2401         }
2402         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2403                             starget->channel + 'A', ROLE_INITIATOR);
2404         ahd_find_syncrate(ahd, &period, &ppr_options,
2405                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2406
2407         ahd_lock(ahd, &flags);
2408         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2409                          ppr_options, AHD_TRANS_GOAL, FALSE);
2410         ahd_unlock(ahd, &flags);
2411 }
2412
2413 static void ahd_linux_set_qas(struct scsi_target *starget, int qas)
2414 {
2415         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2416         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2417         struct ahd_tmode_tstate *tstate;
2418         struct ahd_initiator_tinfo *tinfo
2419                 = ahd_fetch_transinfo(ahd,
2420                                       starget->channel + 'A',
2421                                       shost->this_id, starget->id, &tstate);
2422         struct ahd_devinfo devinfo;
2423         unsigned int ppr_options = tinfo->goal.ppr_options
2424                 & ~MSG_EXT_PPR_QAS_REQ;
2425         unsigned int period = tinfo->goal.period;
2426         unsigned int dt;
2427         unsigned long flags;
2428
2429 #ifdef AHD_DEBUG
2430         if ((ahd_debug & AHD_SHOW_DV) != 0)
2431                 printf("%s: %s QAS\n", ahd_name(ahd),
2432                        qas ? "enabling" : "disabling");
2433 #endif
2434
2435         if (qas) {
2436                 ppr_options |= MSG_EXT_PPR_QAS_REQ;
2437         }
2438
2439         dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2440
2441         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2442                             starget->channel + 'A', ROLE_INITIATOR);
2443         ahd_find_syncrate(ahd, &period, &ppr_options,
2444                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2445
2446         ahd_lock(ahd, &flags);
2447         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2448                          ppr_options, AHD_TRANS_GOAL, FALSE);
2449         ahd_unlock(ahd, &flags);
2450 }
2451
2452 static void ahd_linux_set_iu(struct scsi_target *starget, int iu)
2453 {
2454         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2455         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2456         struct ahd_tmode_tstate *tstate;
2457         struct ahd_initiator_tinfo *tinfo
2458                 = ahd_fetch_transinfo(ahd,
2459                                       starget->channel + 'A',
2460                                       shost->this_id, starget->id, &tstate);
2461         struct ahd_devinfo devinfo;
2462         unsigned int ppr_options = tinfo->goal.ppr_options
2463                 & ~MSG_EXT_PPR_IU_REQ;
2464         unsigned int period = tinfo->goal.period;
2465         unsigned int dt;
2466         unsigned long flags;
2467
2468 #ifdef AHD_DEBUG
2469         if ((ahd_debug & AHD_SHOW_DV) != 0)
2470                 printf("%s: %s IU\n", ahd_name(ahd),
2471                        iu ? "enabling" : "disabling");
2472 #endif
2473
2474         if (iu) {
2475                 ppr_options |= MSG_EXT_PPR_IU_REQ;
2476                 ppr_options |= MSG_EXT_PPR_DT_REQ; /* IU requires DT */
2477         }
2478
2479         dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2480
2481         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2482                             starget->channel + 'A', ROLE_INITIATOR);
2483         ahd_find_syncrate(ahd, &period, &ppr_options,
2484                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2485
2486         ahd_lock(ahd, &flags);
2487         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2488                          ppr_options, AHD_TRANS_GOAL, FALSE);
2489         ahd_unlock(ahd, &flags);
2490 }
2491
2492 static void ahd_linux_set_rd_strm(struct scsi_target *starget, int rdstrm)
2493 {
2494         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2495         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2496         struct ahd_tmode_tstate *tstate;
2497         struct ahd_initiator_tinfo *tinfo
2498                 = ahd_fetch_transinfo(ahd,
2499                                       starget->channel + 'A',
2500                                       shost->this_id, starget->id, &tstate);
2501         struct ahd_devinfo devinfo;
2502         unsigned int ppr_options = tinfo->goal.ppr_options
2503                 & ~MSG_EXT_PPR_RD_STRM;
2504         unsigned int period = tinfo->goal.period;
2505         unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2506         unsigned long flags;
2507
2508 #ifdef AHD_DEBUG
2509         if ((ahd_debug & AHD_SHOW_DV) != 0)
2510                 printf("%s: %s Read Streaming\n", ahd_name(ahd),
2511                        rdstrm  ? "enabling" : "disabling");
2512 #endif
2513
2514         if (rdstrm)
2515                 ppr_options |= MSG_EXT_PPR_RD_STRM;
2516
2517         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2518                             starget->channel + 'A', ROLE_INITIATOR);
2519         ahd_find_syncrate(ahd, &period, &ppr_options,
2520                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2521
2522         ahd_lock(ahd, &flags);
2523         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2524                          ppr_options, AHD_TRANS_GOAL, FALSE);
2525         ahd_unlock(ahd, &flags);
2526 }
2527
2528 static void ahd_linux_set_wr_flow(struct scsi_target *starget, int wrflow)
2529 {
2530         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2531         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2532         struct ahd_tmode_tstate *tstate;
2533         struct ahd_initiator_tinfo *tinfo
2534                 = ahd_fetch_transinfo(ahd,
2535                                       starget->channel + 'A',
2536                                       shost->this_id, starget->id, &tstate);
2537         struct ahd_devinfo devinfo;
2538         unsigned int ppr_options = tinfo->goal.ppr_options
2539                 & ~MSG_EXT_PPR_WR_FLOW;
2540         unsigned int period = tinfo->goal.period;
2541         unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2542         unsigned long flags;
2543
2544 #ifdef AHD_DEBUG
2545         if ((ahd_debug & AHD_SHOW_DV) != 0)
2546                 printf("%s: %s Write Flow Control\n", ahd_name(ahd),
2547                        wrflow ? "enabling" : "disabling");
2548 #endif
2549
2550         if (wrflow)
2551                 ppr_options |= MSG_EXT_PPR_WR_FLOW;
2552
2553         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2554                             starget->channel + 'A', ROLE_INITIATOR);
2555         ahd_find_syncrate(ahd, &period, &ppr_options,
2556                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2557
2558         ahd_lock(ahd, &flags);
2559         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2560                          ppr_options, AHD_TRANS_GOAL, FALSE);
2561         ahd_unlock(ahd, &flags);
2562 }
2563
2564 static void ahd_linux_set_rti(struct scsi_target *starget, int rti)
2565 {
2566         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2567         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2568         struct ahd_tmode_tstate *tstate;
2569         struct ahd_initiator_tinfo *tinfo
2570                 = ahd_fetch_transinfo(ahd,
2571                                       starget->channel + 'A',
2572                                       shost->this_id, starget->id, &tstate);
2573         struct ahd_devinfo devinfo;
2574         unsigned int ppr_options = tinfo->goal.ppr_options
2575                 & ~MSG_EXT_PPR_RTI;
2576         unsigned int period = tinfo->goal.period;
2577         unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2578         unsigned long flags;
2579
2580         if ((ahd->features & AHD_RTI) == 0) {
2581 #ifdef AHD_DEBUG
2582                 if ((ahd_debug & AHD_SHOW_DV) != 0)
2583                         printf("%s: RTI not available\n", ahd_name(ahd));
2584 #endif
2585                 return;
2586         }
2587
2588 #ifdef AHD_DEBUG
2589         if ((ahd_debug & AHD_SHOW_DV) != 0)
2590                 printf("%s: %s RTI\n", ahd_name(ahd),
2591                        rti ? "enabling" : "disabling");
2592 #endif
2593
2594         if (rti)
2595                 ppr_options |= MSG_EXT_PPR_RTI;
2596
2597         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2598                             starget->channel + 'A', ROLE_INITIATOR);
2599         ahd_find_syncrate(ahd, &period, &ppr_options,
2600                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2601
2602         ahd_lock(ahd, &flags);
2603         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2604                          ppr_options, AHD_TRANS_GOAL, FALSE);
2605         ahd_unlock(ahd, &flags);
2606 }
2607
2608 static void ahd_linux_set_pcomp_en(struct scsi_target *starget, int pcomp)
2609 {
2610         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2611         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2612         struct ahd_tmode_tstate *tstate;
2613         struct ahd_initiator_tinfo *tinfo
2614                 = ahd_fetch_transinfo(ahd,
2615                                       starget->channel + 'A',
2616                                       shost->this_id, starget->id, &tstate);
2617         struct ahd_devinfo devinfo;
2618         unsigned int ppr_options = tinfo->goal.ppr_options
2619                 & ~MSG_EXT_PPR_PCOMP_EN;
2620         unsigned int period = tinfo->goal.period;
2621         unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2622         unsigned long flags;
2623
2624 #ifdef AHD_DEBUG
2625         if ((ahd_debug & AHD_SHOW_DV) != 0)
2626                 printf("%s: %s Precompensation\n", ahd_name(ahd),
2627                        pcomp ? "Enable" : "Disable");
2628 #endif
2629
2630         if (pcomp) {
2631                 uint8_t precomp;
2632
2633                 if (ahd->unit < ARRAY_SIZE(aic79xx_iocell_info)) {
2634                         struct ahd_linux_iocell_opts *iocell_opts;
2635
2636                         iocell_opts = &aic79xx_iocell_info[ahd->unit];
2637                         precomp = iocell_opts->precomp;
2638                 } else {
2639                         precomp = AIC79XX_DEFAULT_PRECOMP;
2640                 }
2641                 ppr_options |= MSG_EXT_PPR_PCOMP_EN;
2642                 AHD_SET_PRECOMP(ahd, precomp);
2643         } else {
2644                 AHD_SET_PRECOMP(ahd, 0);
2645         }
2646
2647         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2648                             starget->channel + 'A', ROLE_INITIATOR);
2649         ahd_find_syncrate(ahd, &period, &ppr_options,
2650                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2651
2652         ahd_lock(ahd, &flags);
2653         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2654                          ppr_options, AHD_TRANS_GOAL, FALSE);
2655         ahd_unlock(ahd, &flags);
2656 }
2657
2658 static void ahd_linux_set_hold_mcs(struct scsi_target *starget, int hold)
2659 {
2660         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2661         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2662         struct ahd_tmode_tstate *tstate;
2663         struct ahd_initiator_tinfo *tinfo
2664                 = ahd_fetch_transinfo(ahd,
2665                                       starget->channel + 'A',
2666                                       shost->this_id, starget->id, &tstate);
2667         struct ahd_devinfo devinfo;
2668         unsigned int ppr_options = tinfo->goal.ppr_options
2669                 & ~MSG_EXT_PPR_HOLD_MCS;
2670         unsigned int period = tinfo->goal.period;
2671         unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2672         unsigned long flags;
2673
2674         if (hold)
2675                 ppr_options |= MSG_EXT_PPR_HOLD_MCS;
2676
2677         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2678                             starget->channel + 'A', ROLE_INITIATOR);
2679         ahd_find_syncrate(ahd, &period, &ppr_options,
2680                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2681
2682         ahd_lock(ahd, &flags);
2683         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2684                          ppr_options, AHD_TRANS_GOAL, FALSE);
2685         ahd_unlock(ahd, &flags);
2686 }
2687
2688 static void ahd_linux_get_signalling(struct Scsi_Host *shost)
2689 {
2690         struct ahd_softc *ahd = *(struct ahd_softc **)shost->hostdata;
2691         unsigned long flags;
2692         u8 mode;
2693
2694         ahd_lock(ahd, &flags);
2695         ahd_pause(ahd);
2696         mode = ahd_inb(ahd, SBLKCTL);
2697         ahd_unpause(ahd);
2698         ahd_unlock(ahd, &flags);
2699
2700         if (mode & ENAB40)
2701                 spi_signalling(shost) = SPI_SIGNAL_LVD;
2702         else if (mode & ENAB20)
2703                 spi_signalling(shost) = SPI_SIGNAL_SE;
2704         else
2705                 spi_signalling(shost) = SPI_SIGNAL_UNKNOWN;
2706 }
2707
2708 static struct spi_function_template ahd_linux_transport_functions = {
2709         .set_offset     = ahd_linux_set_offset,
2710         .show_offset    = 1,
2711         .set_period     = ahd_linux_set_period,
2712         .show_period    = 1,
2713         .set_width      = ahd_linux_set_width,
2714         .show_width     = 1,
2715         .set_dt         = ahd_linux_set_dt,
2716         .show_dt        = 1,
2717         .set_iu         = ahd_linux_set_iu,
2718         .show_iu        = 1,
2719         .set_qas        = ahd_linux_set_qas,
2720         .show_qas       = 1,
2721         .set_rd_strm    = ahd_linux_set_rd_strm,
2722         .show_rd_strm   = 1,
2723         .set_wr_flow    = ahd_linux_set_wr_flow,
2724         .show_wr_flow   = 1,
2725         .set_rti        = ahd_linux_set_rti,
2726         .show_rti       = 1,
2727         .set_pcomp_en   = ahd_linux_set_pcomp_en,
2728         .show_pcomp_en  = 1,
2729         .set_hold_mcs   = ahd_linux_set_hold_mcs,
2730         .show_hold_mcs  = 1,
2731         .get_signalling = ahd_linux_get_signalling,
2732 };
2733
2734 static int __init
2735 ahd_linux_init(void)
2736 {
2737         int     error = 0;
2738
2739         /*
2740          * If we've been passed any parameters, process them now.
2741          */
2742         if (aic79xx)
2743                 aic79xx_setup(aic79xx);
2744
2745         ahd_linux_transport_template =
2746                 spi_attach_transport(&ahd_linux_transport_functions);
2747         if (!ahd_linux_transport_template)
2748                 return -ENODEV;
2749
2750         scsi_transport_reserve_device(ahd_linux_transport_template,
2751                                       sizeof(struct ahd_linux_device));
2752
2753         error = ahd_linux_pci_init();
2754         if (error)
2755                 spi_release_transport(ahd_linux_transport_template);
2756         return error;
2757 }
2758
2759 static void __exit
2760 ahd_linux_exit(void)
2761 {
2762         ahd_linux_pci_exit();
2763         spi_release_transport(ahd_linux_transport_template);
2764 }
2765
2766 module_init(ahd_linux_init);
2767 module_exit(ahd_linux_exit);