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  * Certain PCI motherboards will scan PCI devices from highest to lowest,
 247  * others scan from lowest to highest, and they tend to do all kinds of
 248  * strange things when they come into contact with PCI bridge chips.  The
 249  * net result of all this is that the PCI card that is actually used to boot
 250  * the machine is very hard to detect.  Most motherboards go from lowest
 251  * PCI slot number to highest, and the first SCSI controller found is the
 252  * one you boot from.  The only exceptions to this are when a controller
 253  * has its BIOS disabled.  So, we by default sort all of our SCSI controllers
 254  * from lowest PCI slot number to highest PCI slot number.  We also force
 255  * all controllers with their BIOS disabled to the end of the list.  This
 256  * works on *almost* all computers.  Where it doesn't work, we have this
 257  * option.  Setting this option to non-0 will reverse the order of the sort
 258  * to highest first, then lowest, but will still leave cards with their BIOS
 259  * disabled at the very end.  That should fix everyone up unless there are
 260  * really strange cirumstances.
 261  */
 262 static uint32_t aic79xx_reverse_scan;
 263
 264 /*
 265  * Should we force EXTENDED translation on a controller.
 266  *     0 == Use whatever is in the SEEPROM or default to off
 267  *     1 == Use whatever is in the SEEPROM or default to on
 268  */
 269 static uint32_t aic79xx_extended;
 270
 271 /*
 272  * PCI bus parity checking of the Adaptec controllers.  This is somewhat
 273  * dubious at best.  To my knowledge, this option has never actually
 274  * solved a PCI parity problem, but on certain machines with broken PCI
 275  * chipset configurations, it can generate tons of false error messages.
 276  * It's included in the driver for completeness.
 277  *   0     = Shut off PCI parity check
 278  *   non-0 = Enable PCI parity check
 279  *
 280  * NOTE: you can't actually pass -1 on the lilo prompt.  So, to set this
 281  * variable to -1 you would actually want to simply pass the variable
 282  * name without a number.  That will invert the 0 which will result in
 283  * -1.
 284  */
 285 static uint32_t aic79xx_pci_parity = ~0;
 286
 287 /*
 288  * There are lots of broken chipsets in the world.  Some of them will
 289  * violate the PCI spec when we issue byte sized memory writes to our
 290  * controller.  I/O mapped register access, if allowed by the given
 291  * platform, will work in almost all cases.
 292  */
 293 uint32_t aic79xx_allow_memio = ~0;
 294
 295 /*
 296  * So that we can set how long each device is given as a selection timeout.
 297  * The table of values goes like this:
 298  *   0 - 256ms
 299  *   1 - 128ms
 300  *   2 - 64ms
 301  *   3 - 32ms
 302  * We default to 256ms because some older devices need a longer time
 303  * to respond to initial selection.
 304  */
 305 static uint32_t aic79xx_seltime;
 306
 307 /*
 308  * Certain devices do not perform any aging on commands.  Should the
 309  * device be saturated by commands in one portion of the disk, it is
 310  * possible for transactions on far away sectors to never be serviced.
 311  * To handle these devices, we can periodically send an ordered tag to
 312  * force all outstanding transactions to be serviced prior to a new
 313  * transaction.
 314  */
 315 uint32_t aic79xx_periodic_otag;
 316
 317 /*
 318  * Module information and settable options.
 319  */
 320 static char *aic79xx = NULL;
 321
 322 MODULE_AUTHOR("Maintainer: Justin T. Gibbs <gibbs@scsiguy.com>");
 323 MODULE_DESCRIPTION("Adaptec Aic790X U320 SCSI Host Bus Adapter driver");
 324 MODULE_LICENSE("Dual BSD/GPL");
 325 MODULE_VERSION(AIC79XX_DRIVER_VERSION);
 326 module_param(aic79xx, charp, 0444);
 327 MODULE_PARM_DESC(aic79xx,
 328 "period delimited, options string.\n"
 329 "       verbose                 Enable verbose/diagnostic logging\n"
 330 "       allow_memio             Allow device registers to be memory mapped\n"
 331 "       debug                   Bitmask of debug values to enable\n"
 332 "       no_reset                Supress initial bus resets\n"
 333 "       extended                Enable extended geometry on all controllers\n"
 334 "       periodic_otag           Send an ordered tagged transaction\n"
 335 "                               periodically to prevent tag starvation.\n"
 336 "                               This may be required by some older disk\n"
 337 "                               or drives/RAID arrays.\n"
 338 "       reverse_scan            Sort PCI devices highest Bus/Slot to lowest\n"
 339 "       tag_info:<tag_str>      Set per-target tag depth\n"
 340 "       global_tag_depth:<int>  Global tag depth for all targets on all buses\n"
 341 "       slewrate:<slewrate_list>Set the signal slew rate (0-15).\n"
 342 "       precomp:<pcomp_list>    Set the signal precompensation (0-7).\n"
 343 "       amplitude:<int>         Set the signal amplitude (0-7).\n"
 344 "       seltime:<int>           Selection Timeout:\n"
 345 "                               (0/256ms,1/128ms,2/64ms,3/32ms)\n"
 346 "\n"
 347 "       Sample /etc/modprobe.conf line:\n"
 348 "               Enable verbose logging\n"
 349 "               Set tag depth on Controller 2/Target 2 to 10 tags\n"
 350 "               Shorten the selection timeout to 128ms\n"
 351 "\n"
 352 "       options aic79xx 'aic79xx=verbose.tag_info:{{}.{}.{..10}}.seltime:1'\n"
 353 "\n");
 354
 355 static void ahd_linux_handle_scsi_status(struct ahd_softc *,
 356                                          struct scsi_device *,
 357                                          struct scb *);
 358 static void ahd_linux_queue_cmd_complete(struct ahd_softc *ahd,
 359                                          struct scsi_cmnd *cmd);
 360 static void ahd_linux_sem_timeout(u_long arg);
 361 static int  ahd_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag);
 362 static void ahd_linux_initialize_scsi_bus(struct ahd_softc *ahd);
 363 static u_int ahd_linux_user_tagdepth(struct ahd_softc *ahd,
 364                                      struct ahd_devinfo *devinfo);
 365 static void ahd_linux_device_queue_depth(struct scsi_device *);
 366 static int ahd_linux_run_command(struct ahd_softc*,
 367                                  struct ahd_linux_device *,
 368                                  struct scsi_cmnd *);
 369 static void ahd_linux_setup_tag_info_global(char *p);
 370 static int  aic79xx_setup(char *c);
 371
 372 static int ahd_linux_unit;
 373
 374
 375 /****************************** Inlines ***************************************/
 376 static __inline void ahd_linux_unmap_scb(struct ahd_softc*, struct scb*);
 377
 378 static __inline void
 379 ahd_linux_unmap_scb(struct ahd_softc *ahd, struct scb *scb)
 380 {
 381         struct scsi_cmnd *cmd;
 382         int direction;
 383
 384         cmd = scb->io_ctx;
 385         direction = cmd->sc_data_direction;
 386         ahd_sync_sglist(ahd, scb, BUS_DMASYNC_POSTWRITE);
 387         if (cmd->use_sg != 0) {
 388                 struct scatterlist *sg;
 389
 390                 sg = (struct scatterlist *)cmd->request_buffer;
 391                 pci_unmap_sg(ahd->dev_softc, sg, cmd->use_sg, direction);
 392         } else if (cmd->request_bufflen != 0) {
 393                 pci_unmap_single(ahd->dev_softc,
 394                                  scb->platform_data->buf_busaddr,
 395                                  cmd->request_bufflen, direction);
 396         }
 397 }
 398
 399 /******************************** Macros **************************************/
 400 #define BUILD_SCSIID(ahd, cmd)                                          \
 401         (((scmd_id(cmd) << TID_SHIFT) & TID) | (ahd)->our_id)
 402
 403 /*
 404  * Return a string describing the driver.
 405  */
 406 static const char *
 407 ahd_linux_info(struct Scsi_Host *host)
 408 {
 409         static char buffer[512];
 410         char    ahd_info[256];
 411         char   *bp;
 412         struct ahd_softc *ahd;
 413
 414         bp = &buffer[0];
 415         ahd = *(struct ahd_softc **)host->hostdata;
 416         memset(bp, 0, sizeof(buffer));
 417         strcpy(bp, "Adaptec AIC79XX PCI-X SCSI HBA DRIVER, Rev ");
 418         strcat(bp, AIC79XX_DRIVER_VERSION);
 419         strcat(bp, "\n");
 420         strcat(bp, "        <");
 421         strcat(bp, ahd->description);
 422         strcat(bp, ">\n");
 423         strcat(bp, "        ");
 424         ahd_controller_info(ahd, ahd_info);
 425         strcat(bp, ahd_info);
 426         strcat(bp, "\n");
 427
 428         return (bp);
 429 }
 430
 431 /*
 432  * Queue an SCB to the controller.
 433  */
 434 static int
 435 ahd_linux_queue(struct scsi_cmnd * cmd, void (*scsi_done) (struct scsi_cmnd *))
 436 {
 437         struct   ahd_softc *ahd;
 438         struct   ahd_linux_device *dev = scsi_transport_device_data(cmd->device);
 439
 440         ahd = *(struct ahd_softc **)cmd->device->host->hostdata;
 441
 442         /*
 443          * Close the race of a command that was in the process of
 444          * being queued to us just as our simq was frozen.  Let
 445          * DV commands through so long as we are only frozen to
 446          * perform DV.
 447          */
 448         if (ahd->platform_data->qfrozen != 0) {
 449                 printf("%s: queue frozen\n", ahd_name(ahd));
 450
 451                 return SCSI_MLQUEUE_HOST_BUSY;
 452         }
 453
 454         /*
 455          * Save the callback on completion function.
 456          */
 457         cmd->scsi_done = scsi_done;
 458
 459         cmd->result = CAM_REQ_INPROG << 16;
 460
 461         return ahd_linux_run_command(ahd, dev, cmd);
 462 }
 463
 464 static inline struct scsi_target **
 465 ahd_linux_target_in_softc(struct scsi_target *starget)
 466 {
 467         struct  ahd_softc *ahd =
 468                 *((struct ahd_softc **)dev_to_shost(&starget->dev)->hostdata);
 469         unsigned int target_offset;
 470
 471         target_offset = starget->id;
 472         if (starget->channel != 0)
 473                 target_offset += 8;
 474
 475         return &ahd->platform_data->starget[target_offset];
 476 }
 477
 478 static int
 479 ahd_linux_target_alloc(struct scsi_target *starget)
 480 {
 481         struct  ahd_softc *ahd =
 482                 *((struct ahd_softc **)dev_to_shost(&starget->dev)->hostdata);
 483         unsigned long flags;
 484         struct scsi_target **ahd_targp = ahd_linux_target_in_softc(starget);
 485         struct ahd_linux_target *targ = scsi_transport_target_data(starget);
 486         struct ahd_devinfo devinfo;
 487         struct ahd_initiator_tinfo *tinfo;
 488         struct ahd_tmode_tstate *tstate;
 489         char channel = starget->channel + 'A';
 490
 491         ahd_lock(ahd, &flags);
 492
 493         BUG_ON(*ahd_targp != NULL);
 494
 495         *ahd_targp = starget;
 496         memset(targ, 0, sizeof(*targ));
 497
 498         tinfo = ahd_fetch_transinfo(ahd, channel, ahd->our_id,
 499                                     starget->id, &tstate);
 500         ahd_compile_devinfo(&devinfo, ahd->our_id, starget->id,
 501                             CAM_LUN_WILDCARD, channel,
 502                             ROLE_INITIATOR);
 503         spi_min_period(starget) = AHD_SYNCRATE_MAX; /* We can do U320 */
 504         if ((ahd->bugs & AHD_PACED_NEGTABLE_BUG) != 0)
 505                 spi_max_offset(starget) = MAX_OFFSET_PACED_BUG;
 506         else
 507                 spi_max_offset(starget) = MAX_OFFSET_PACED;
 508         spi_max_width(starget) = ahd->features & AHD_WIDE;
 509
 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 scsi_target *starget = sdev->sdev_target;
 533         struct ahd_linux_target *targ = scsi_transport_target_data(starget);
 534         struct ahd_linux_device *dev;
 535
 536         if (bootverbose)
 537                 printf("%s: Slave Alloc %d\n", ahd_name(ahd), sdev->id);
 538
 539         BUG_ON(targ->sdev[sdev->lun] != NULL);
 540
 541         dev = scsi_transport_device_data(sdev);
 542         memset(dev, 0, sizeof(*dev));
 543
 544         /*
 545          * We start out life using untagged
 546          * transactions of which we allow one.
 547          */
 548         dev->openings = 1;
 549
 550         /*
 551          * Set maxtags to 0.  This will be changed if we
 552          * later determine that we are dealing with
 553          * a tagged queuing capable device.
 554          */
 555         dev->maxtags = 0;
 556
 557         targ->sdev[sdev->lun] = sdev;
 558
 559         return (0);
 560 }
 561
 562 static int
 563 ahd_linux_slave_configure(struct scsi_device *sdev)
 564 {
 565         struct  ahd_softc *ahd;
 566
 567         ahd = *((struct ahd_softc **)sdev->host->hostdata);
 568         if (bootverbose)
 569                 sdev_printk(KERN_INFO, sdev, "Slave Configure\n");
 570
 571         ahd_linux_device_queue_depth(sdev);
 572
 573         /* Initial Domain Validation */
 574         if (!spi_initial_dv(sdev->sdev_target))
 575                 spi_dv_device(sdev);
 576
 577         return 0;
 578 }
 579
 580 static void
 581 ahd_linux_slave_destroy(struct scsi_device *sdev)
 582 {
 583         struct  ahd_softc *ahd;
 584         struct  ahd_linux_device *dev = scsi_transport_device_data(sdev);
 585         struct  ahd_linux_target *targ = scsi_transport_target_data(sdev->sdev_target);
 586
 587         ahd = *((struct ahd_softc **)sdev->host->hostdata);
 588         if (bootverbose)
 589                 printf("%s: Slave Destroy %d\n", ahd_name(ahd), sdev->id);
 590
 591         BUG_ON(dev->active);
 592
 593         targ->sdev[sdev->lun] = NULL;
 594
 595 }
 596
 597 #if defined(__i386__)
 598 /*
 599  * Return the disk geometry for the given SCSI device.
 600  */
 601 static int
 602 ahd_linux_biosparam(struct scsi_device *sdev, struct block_device *bdev,
 603                     sector_t capacity, int geom[])
 604 {
 605         uint8_t *bh;
 606         int      heads;
 607         int      sectors;
 608         int      cylinders;
 609         int      ret;
 610         int      extended;
 611         struct   ahd_softc *ahd;
 612
 613         ahd = *((struct ahd_softc **)sdev->host->hostdata);
 614
 615         bh = scsi_bios_ptable(bdev);
 616         if (bh) {
 617                 ret = scsi_partsize(bh, capacity,
 618                                     &geom[2], &geom[0], &geom[1]);
 619                 kfree(bh);
 620                 if (ret != -1)
 621                         return (ret);
 622         }
 623         heads = 64;
 624         sectors = 32;
 625         cylinders = aic_sector_div(capacity, heads, sectors);
 626
 627         if (aic79xx_extended != 0)
 628                 extended = 1;
 629         else
 630                 extended = (ahd->flags & AHD_EXTENDED_TRANS_A) != 0;
 631         if (extended && cylinders >= 1024) {
 632                 heads = 255;
 633                 sectors = 63;
 634                 cylinders = aic_sector_div(capacity, heads, sectors);
 635         }
 636         geom[0] = heads;
 637         geom[1] = sectors;
 638         geom[2] = cylinders;
 639         return (0);
 640 }
 641 #endif
 642
 643 /*
 644  * Abort the current SCSI command(s).
 645  */
 646 static int
 647 ahd_linux_abort(struct scsi_cmnd *cmd)
 648 {
 649         int error;
 650
 651         error = ahd_linux_queue_recovery_cmd(cmd, SCB_ABORT);
 652         if (error != 0)
 653                 printf("aic79xx_abort returns 0x%x\n", error);
 654         return error;
 655 }
 656
 657 /*
 658  * Attempt to send a target reset message to the device that timed out.
 659  */
 660 static int
 661 ahd_linux_dev_reset(struct scsi_cmnd *cmd)
 662 {
 663         int error;
 664
 665         error = ahd_linux_queue_recovery_cmd(cmd, SCB_DEVICE_RESET);
 666         if (error != 0)
 667                 printf("aic79xx_dev_reset returns 0x%x\n", error);
 668         return error;
 669 }
 670
 671 /*
 672  * Reset the SCSI bus.
 673  */
 674 static int
 675 ahd_linux_bus_reset(struct scsi_cmnd *cmd)
 676 {
 677         struct ahd_softc *ahd;
 678         u_long s;
 679         int    found;
 680
 681         ahd = *(struct ahd_softc **)cmd->device->host->hostdata;
 682 #ifdef AHD_DEBUG
 683         if ((ahd_debug & AHD_SHOW_RECOVERY) != 0)
 684                 printf("%s: Bus reset called for cmd %p\n",
 685                        ahd_name(ahd), cmd);
 686 #endif
 687         ahd_lock(ahd, &s);
 688         found = ahd_reset_channel(ahd, scmd_channel(cmd) + 'A',
 689                                   /*initiate reset*/TRUE);
 690         ahd_unlock(ahd, &s);
 691
 692         if (bootverbose)
 693                 printf("%s: SCSI bus reset delivered. "
 694                        "%d SCBs aborted.\n", ahd_name(ahd), found);
 695
 696         return (SUCCESS);
 697 }
 698
 699 struct scsi_host_template aic79xx_driver_template = {
 700         .module                 = THIS_MODULE,
 701         .name                   = "aic79xx",
 702         .proc_name              = "aic79xx",
 703         .proc_info              = ahd_linux_proc_info,
 704         .info                   = ahd_linux_info,
 705         .queuecommand           = ahd_linux_queue,
 706         .eh_abort_handler       = ahd_linux_abort,
 707         .eh_device_reset_handler = ahd_linux_dev_reset,
 708         .eh_bus_reset_handler   = ahd_linux_bus_reset,
 709 #if defined(__i386__)
 710         .bios_param             = ahd_linux_biosparam,
 711 #endif
 712         .can_queue              = AHD_MAX_QUEUE,
 713         .this_id                = -1,
 714         .cmd_per_lun            = 2,
 715         .use_clustering         = ENABLE_CLUSTERING,
 716         .slave_alloc            = ahd_linux_slave_alloc,
 717         .slave_configure        = ahd_linux_slave_configure,
 718         .slave_destroy          = ahd_linux_slave_destroy,
 719         .target_alloc           = ahd_linux_target_alloc,
 720         .target_destroy         = ahd_linux_target_destroy,
 721 };
 722
 723 /******************************** Bus DMA *************************************/
 724 int
 725 ahd_dma_tag_create(struct ahd_softc *ahd, bus_dma_tag_t parent,
 726                    bus_size_t alignment, bus_size_t boundary,
 727                    dma_addr_t lowaddr, dma_addr_t highaddr,
 728                    bus_dma_filter_t *filter, void *filterarg,
 729                    bus_size_t maxsize, int nsegments,
 730                    bus_size_t maxsegsz, int flags, bus_dma_tag_t *ret_tag)
 731 {
 732         bus_dma_tag_t dmat;
 733
 734         dmat = malloc(sizeof(*dmat), M_DEVBUF, M_NOWAIT);
 735         if (dmat == NULL)
 736                 return (ENOMEM);
 737
 738         /*
 739          * Linux is very simplistic about DMA memory.  For now don't
 740          * maintain all specification information.  Once Linux supplies
 741          * better facilities for doing these operations, or the
 742          * needs of this particular driver change, we might need to do
 743          * more here.
 744          */
 745         dmat->alignment = alignment;
 746         dmat->boundary = boundary;
 747         dmat->maxsize = maxsize;
 748         *ret_tag = dmat;
 749         return (0);
 750 }
 751
 752 void
 753 ahd_dma_tag_destroy(struct ahd_softc *ahd, bus_dma_tag_t dmat)
 754 {
 755         free(dmat, M_DEVBUF);
 756 }
 757
 758 int
 759 ahd_dmamem_alloc(struct ahd_softc *ahd, bus_dma_tag_t dmat, void** vaddr,
 760                  int flags, bus_dmamap_t *mapp)
 761 {
 762         *vaddr = pci_alloc_consistent(ahd->dev_softc,
 763                                       dmat->maxsize, mapp);
 764         if (*vaddr == NULL)
 765                 return (ENOMEM);
 766         return(0);
 767 }
 768
 769 void
 770 ahd_dmamem_free(struct ahd_softc *ahd, bus_dma_tag_t dmat,
 771                 void* vaddr, bus_dmamap_t map)
 772 {
 773         pci_free_consistent(ahd->dev_softc, dmat->maxsize,
 774                             vaddr, map);
 775 }
 776
 777 int
 778 ahd_dmamap_load(struct ahd_softc *ahd, bus_dma_tag_t dmat, bus_dmamap_t map,
 779                 void *buf, bus_size_t buflen, bus_dmamap_callback_t *cb,
 780                 void *cb_arg, int flags)
 781 {
 782         /*
 783          * Assume for now that this will only be used during
 784          * initialization and not for per-transaction buffer mapping.
 785          */
 786         bus_dma_segment_t stack_sg;
 787
 788         stack_sg.ds_addr = map;
 789         stack_sg.ds_len = dmat->maxsize;
 790         cb(cb_arg, &stack_sg, /*nseg*/1, /*error*/0);
 791         return (0);
 792 }
 793
 794 void
 795 ahd_dmamap_destroy(struct ahd_softc *ahd, bus_dma_tag_t dmat, bus_dmamap_t map)
 796 {
 797 }
 798
 799 int
 800 ahd_dmamap_unload(struct ahd_softc *ahd, bus_dma_tag_t dmat, bus_dmamap_t map)
 801 {
 802         /* Nothing to do */
 803         return (0);
 804 }
 805
 806 /********************* Platform Dependent Functions ***************************/
 807 /*
 808  * Compare "left hand" softc with "right hand" softc, returning:
 809  * < 0 - lahd has a lower priority than rahd
 810  *   0 - Softcs are equal
 811  * > 0 - lahd has a higher priority than rahd
 812  */
 813 int
 814 ahd_softc_comp(struct ahd_softc *lahd, struct ahd_softc *rahd)
 815 {
 816         int     value;
 817
 818         /*
 819          * Under Linux, cards are ordered as follows:
 820          *      1) PCI devices that are marked as the boot controller.
 821          *      2) PCI devices with BIOS enabled sorted by bus/slot/func.
 822          *      3) All remaining PCI devices sorted by bus/slot/func.
 823          */
 824 #if 0
 825         value = (lahd->flags & AHD_BOOT_CHANNEL)
 826               - (rahd->flags & AHD_BOOT_CHANNEL);
 827         if (value != 0)
 828                 /* Controllers set for boot have a *higher* priority */
 829                 return (value);
 830 #endif
 831
 832         value = (lahd->flags & AHD_BIOS_ENABLED)
 833               - (rahd->flags & AHD_BIOS_ENABLED);
 834         if (value != 0)
 835                 /* Controllers with BIOS enabled have a *higher* priority */
 836                 return (value);
 837
 838         /* Still equal.  Sort by bus/slot/func. */
 839         if (aic79xx_reverse_scan != 0)
 840                 value = ahd_get_pci_bus(lahd->dev_softc)
 841                       - ahd_get_pci_bus(rahd->dev_softc);
 842         else
 843                 value = ahd_get_pci_bus(rahd->dev_softc)
 844                       - ahd_get_pci_bus(lahd->dev_softc);
 845         if (value != 0)
 846                 return (value);
 847         if (aic79xx_reverse_scan != 0)
 848                 value = ahd_get_pci_slot(lahd->dev_softc)
 849                       - ahd_get_pci_slot(rahd->dev_softc);
 850         else
 851                 value = ahd_get_pci_slot(rahd->dev_softc)
 852                       - ahd_get_pci_slot(lahd->dev_softc);
 853         if (value != 0)
 854                 return (value);
 855
 856         value = rahd->channel - lahd->channel;
 857         return (value);
 858 }
 859
 860 static void
 861 ahd_linux_setup_iocell_info(u_long index, int instance, int targ, int32_t value)
 862 {
 863
 864         if ((instance >= 0)
 865          && (instance < NUM_ELEMENTS(aic79xx_iocell_info))) {
 866                 uint8_t *iocell_info;
 867
 868                 iocell_info = (uint8_t*)&aic79xx_iocell_info[instance];
 869                 iocell_info[index] = value & 0xFFFF;
 870                 if (bootverbose)
 871                         printf("iocell[%d:%ld] = %d\n", instance, index, value);
 872         }
 873 }
 874
 875 static void
 876 ahd_linux_setup_tag_info_global(char *p)
 877 {
 878         int tags, i, j;
 879
 880         tags = simple_strtoul(p + 1, NULL, 0) & 0xff;
 881         printf("Setting Global Tags= %d\n", tags);
 882
 883         for (i = 0; i < NUM_ELEMENTS(aic79xx_tag_info); i++) {
 884                 for (j = 0; j < AHD_NUM_TARGETS; j++) {
 885                         aic79xx_tag_info[i].tag_commands[j] = tags;
 886                 }
 887         }
 888 }
 889
 890 static void
 891 ahd_linux_setup_tag_info(u_long arg, int instance, int targ, int32_t value)
 892 {
 893
 894         if ((instance >= 0) && (targ >= 0)
 895          && (instance < NUM_ELEMENTS(aic79xx_tag_info))
 896          && (targ < AHD_NUM_TARGETS)) {
 897                 aic79xx_tag_info[instance].tag_commands[targ] = value & 0x1FF;
 898                 if (bootverbose)
 899                         printf("tag_info[%d:%d] = %d\n", instance, targ, value);
 900         }
 901 }
 902
 903 static char *
 904 ahd_parse_brace_option(char *opt_name, char *opt_arg, char *end, int depth,
 905                        void (*callback)(u_long, int, int, int32_t),
 906                        u_long callback_arg)
 907 {
 908         char    *tok_end;
 909         char    *tok_end2;
 910         int      i;
 911         int      instance;
 912         int      targ;
 913         int      done;
 914         char     tok_list[] = {'.', ',', '{', '}', '\0'};
 915
 916         /* All options use a ':' name/arg separator */
 917         if (*opt_arg != ':')
 918                 return (opt_arg);
 919         opt_arg++;
 920         instance = -1;
 921         targ = -1;
 922         done = FALSE;
 923         /*
 924          * Restore separator that may be in
 925          * the middle of our option argument.
 926          */
 927         tok_end = strchr(opt_arg, '\0');
 928         if (tok_end < end)
 929                 *tok_end = ',';
 930         while (!done) {
 931                 switch (*opt_arg) {
 932                 case '{':
 933                         if (instance == -1) {
 934                                 instance = 0;
 935                         } else {
 936                                 if (depth > 1) {
 937                                         if (targ == -1)
 938                                                 targ = 0;
 939                                 } else {
 940                                         printf("Malformed Option %s\n",
 941                                                opt_name);
 942                                         done = TRUE;
 943                                 }
 944                         }
 945                         opt_arg++;
 946                         break;
 947                 case '}':
 948                         if (targ != -1)
 949                                 targ = -1;
 950                         else if (instance != -1)
 951                                 instance = -1;
 952                         opt_arg++;
 953                         break;
 954                 case ',':
 955                 case '.':
 956                         if (instance == -1)
 957                                 done = TRUE;
 958                         else if (targ >= 0)
 959                                 targ++;
 960                         else if (instance >= 0)
 961                                 instance++;
 962                         opt_arg++;
 963                         break;
 964                 case '\0':
 965                         done = TRUE;
 966                         break;
 967                 default:
 968                         tok_end = end;
 969                         for (i = 0; tok_list[i]; i++) {
 970                                 tok_end2 = strchr(opt_arg, tok_list[i]);
 971                                 if ((tok_end2) && (tok_end2 < tok_end))
 972                                         tok_end = tok_end2;
 973                         }
 974                         callback(callback_arg, instance, targ,
 975                                  simple_strtol(opt_arg, NULL, 0));
 976                         opt_arg = tok_end;
 977                         break;
 978                 }
 979         }
 980         return (opt_arg);
 981 }
 982
 983 /*
 984  * Handle Linux boot parameters. This routine allows for assigning a value
 985  * to a parameter with a ':' between the parameter and the value.
 986  * ie. aic79xx=stpwlev:1,extended
 987  */
 988 static int
 989 aic79xx_setup(char *s)
 990 {
 991         int     i, n;
 992         char   *p;
 993         char   *end;
 994
 995         static struct {
 996                 const char *name;
 997                 uint32_t *flag;
 998         } options[] = {
 999                 { "extended", &aic79xx_extended },
1000                 { "no_reset", &aic79xx_no_reset },
1001                 { "verbose", &aic79xx_verbose },
1002                 { "allow_memio", &aic79xx_allow_memio},
1003 #ifdef AHD_DEBUG
1004                 { "debug", &ahd_debug },
1005 #endif
1006                 { "reverse_scan", &aic79xx_reverse_scan },
1007                 { "periodic_otag", &aic79xx_periodic_otag },
1008                 { "pci_parity", &aic79xx_pci_parity },
1009                 { "seltime", &aic79xx_seltime },
1010                 { "tag_info", NULL },
1011                 { "global_tag_depth", NULL},
1012                 { "slewrate", NULL },
1013                 { "precomp", NULL },
1014                 { "amplitude", NULL },
1015         };
1016
1017         end = strchr(s, '\0');
1018
1019         /*
1020          * XXX ia64 gcc isn't smart enough to know that NUM_ELEMENTS
1021          * will never be 0 in this case.
1022          */
1023         n = 0;
1024
1025         while ((p = strsep(&s, ",.")) != NULL) {
1026                 if (*p == '\0')
1027                         continue;
1028                 for (i = 0; i < NUM_ELEMENTS(options); i++) {
1029
1030                         n = strlen(options[i].name);
1031                         if (strncmp(options[i].name, p, n) == 0)
1032                                 break;
1033                 }
1034                 if (i == NUM_ELEMENTS(options))
1035                         continue;
1036
1037                 if (strncmp(p, "global_tag_depth", n) == 0) {
1038                         ahd_linux_setup_tag_info_global(p + n);
1039                 } else if (strncmp(p, "tag_info", n) == 0) {
1040                         s = ahd_parse_brace_option("tag_info", p + n, end,
1041                             2, ahd_linux_setup_tag_info, 0);
1042                 } else if (strncmp(p, "slewrate", n) == 0) {
1043                         s = ahd_parse_brace_option("slewrate",
1044                             p + n, end, 1, ahd_linux_setup_iocell_info,
1045                             AIC79XX_SLEWRATE_INDEX);
1046                 } else if (strncmp(p, "precomp", n) == 0) {
1047                         s = ahd_parse_brace_option("precomp",
1048                             p + n, end, 1, ahd_linux_setup_iocell_info,
1049                             AIC79XX_PRECOMP_INDEX);
1050                 } else if (strncmp(p, "amplitude", n) == 0) {
1051                         s = ahd_parse_brace_option("amplitude",
1052                             p + n, end, 1, ahd_linux_setup_iocell_info,
1053                             AIC79XX_AMPLITUDE_INDEX);
1054                 } else if (p[n] == ':') {
1055                         *(options[i].flag) = simple_strtoul(p + n + 1, NULL, 0);
1056                 } else if (!strncmp(p, "verbose", n)) {
1057                         *(options[i].flag) = 1;
1058                 } else {
1059                         *(options[i].flag) ^= 0xFFFFFFFF;
1060                 }
1061         }
1062         return 1;
1063 }
1064
1065 __setup("aic79xx=", aic79xx_setup);
1066
1067 uint32_t aic79xx_verbose;
1068
1069 int
1070 ahd_linux_register_host(struct ahd_softc *ahd, struct scsi_host_template *template)
1071 {
1072         char    buf[80];
1073         struct  Scsi_Host *host;
1074         char    *new_name;
1075         u_long  s;
1076
1077         template->name = ahd->description;
1078         host = scsi_host_alloc(template, sizeof(struct ahd_softc *));
1079         if (host == NULL)
1080                 return (ENOMEM);
1081
1082         *((struct ahd_softc **)host->hostdata) = ahd;
1083         ahd_lock(ahd, &s);
1084         scsi_assign_lock(host, &ahd->platform_data->spin_lock);
1085         ahd->platform_data->host = host;
1086         host->can_queue = AHD_MAX_QUEUE;
1087         host->cmd_per_lun = 2;
1088         host->sg_tablesize = AHD_NSEG;
1089         host->this_id = ahd->our_id;
1090         host->irq = ahd->platform_data->irq;
1091         host->max_id = (ahd->features & AHD_WIDE) ? 16 : 8;
1092         host->max_lun = AHD_NUM_LUNS;
1093         host->max_channel = 0;
1094         host->sg_tablesize = AHD_NSEG;
1095         ahd_set_unit(ahd, ahd_linux_unit++);
1096         sprintf(buf, "scsi%d", host->host_no);
1097         new_name = malloc(strlen(buf) + 1, M_DEVBUF, M_NOWAIT);
1098         if (new_name != NULL) {
1099                 strcpy(new_name, buf);
1100                 ahd_set_name(ahd, new_name);
1101         }
1102         host->unique_id = ahd->unit;
1103         ahd_linux_initialize_scsi_bus(ahd);
1104         ahd_intr_enable(ahd, TRUE);
1105         ahd_unlock(ahd, &s);
1106
1107         host->transportt = ahd_linux_transport_template;
1108
1109         scsi_add_host(host, &ahd->dev_softc->dev); /* XXX handle failure */
1110         scsi_scan_host(host);
1111         return (0);
1112 }
1113
1114 uint64_t
1115 ahd_linux_get_memsize(void)
1116 {
1117         struct sysinfo si;
1118
1119         si_meminfo(&si);
1120         return ((uint64_t)si.totalram << PAGE_SHIFT);
1121 }
1122
1123 /*
1124  * Place the SCSI bus into a known state by either resetting it,
1125  * or forcing transfer negotiations on the next command to any
1126  * target.
1127  */
1128 static void
1129 ahd_linux_initialize_scsi_bus(struct ahd_softc *ahd)
1130 {
1131         u_int target_id;
1132         u_int numtarg;
1133
1134         target_id = 0;
1135         numtarg = 0;
1136
1137         if (aic79xx_no_reset != 0)
1138                 ahd->flags &= ~AHD_RESET_BUS_A;
1139
1140         if ((ahd->flags & AHD_RESET_BUS_A) != 0)
1141                 ahd_reset_channel(ahd, 'A', /*initiate_reset*/TRUE);
1142         else
1143                 numtarg = (ahd->features & AHD_WIDE) ? 16 : 8;
1144
1145         /*
1146          * Force negotiation to async for all targets that
1147          * will not see an initial bus reset.
1148          */
1149         for (; target_id < numtarg; target_id++) {
1150                 struct ahd_devinfo devinfo;
1151                 struct ahd_initiator_tinfo *tinfo;
1152                 struct ahd_tmode_tstate *tstate;
1153
1154                 tinfo = ahd_fetch_transinfo(ahd, 'A', ahd->our_id,
1155                                             target_id, &tstate);
1156                 ahd_compile_devinfo(&devinfo, ahd->our_id, target_id,
1157                                     CAM_LUN_WILDCARD, 'A', ROLE_INITIATOR);
1158                 ahd_update_neg_request(ahd, &devinfo, tstate,
1159                                        tinfo, AHD_NEG_ALWAYS);
1160         }
1161         /* Give the bus some time to recover */
1162         if ((ahd->flags & AHD_RESET_BUS_A) != 0) {
1163                 ahd_freeze_simq(ahd);
1164                 init_timer(&ahd->platform_data->reset_timer);
1165                 ahd->platform_data->reset_timer.data = (u_long)ahd;
1166                 ahd->platform_data->reset_timer.expires =
1167                     jiffies + (AIC79XX_RESET_DELAY * HZ)/1000;
1168                 ahd->platform_data->reset_timer.function =
1169                     (ahd_linux_callback_t *)ahd_release_simq;
1170                 add_timer(&ahd->platform_data->reset_timer);
1171         }
1172 }
1173
1174 int
1175 ahd_platform_alloc(struct ahd_softc *ahd, void *platform_arg)
1176 {
1177         ahd->platform_data =
1178             malloc(sizeof(struct ahd_platform_data), M_DEVBUF, M_NOWAIT);
1179         if (ahd->platform_data == NULL)
1180                 return (ENOMEM);
1181         memset(ahd->platform_data, 0, sizeof(struct ahd_platform_data));
1182         ahd->platform_data->irq = AHD_LINUX_NOIRQ;
1183         ahd_lockinit(ahd);
1184         init_MUTEX_LOCKED(&ahd->platform_data->eh_sem);
1185         ahd->seltime = (aic79xx_seltime & 0x3) << 4;
1186         return (0);
1187 }
1188
1189 void
1190 ahd_platform_free(struct ahd_softc *ahd)
1191 {
1192         struct scsi_target *starget;
1193         int i, j;
1194
1195         if (ahd->platform_data != NULL) {
1196                 /* destroy all of the device and target objects */
1197                 for (i = 0; i < AHD_NUM_TARGETS; i++) {
1198                         starget = ahd->platform_data->starget[i];
1199                         if (starget != NULL) {
1200                                 for (j = 0; j < AHD_NUM_LUNS; j++) {
1201                                         struct ahd_linux_target *targ =
1202                                                 scsi_transport_target_data(starget);
1203                                         if (targ->sdev[j] == NULL)
1204                                                 continue;
1205                                         targ->sdev[j] = NULL;
1206                                 }
1207                                 ahd->platform_data->starget[i] = NULL;
1208                         }
1209                 }
1210
1211                 if (ahd->platform_data->irq != AHD_LINUX_NOIRQ)
1212                         free_irq(ahd->platform_data->irq, ahd);
1213                 if (ahd->tags[0] == BUS_SPACE_PIO
1214                  && ahd->bshs[0].ioport != 0)
1215                         release_region(ahd->bshs[0].ioport, 256);
1216                 if (ahd->tags[1] == BUS_SPACE_PIO
1217                  && ahd->bshs[1].ioport != 0)
1218                         release_region(ahd->bshs[1].ioport, 256);
1219                 if (ahd->tags[0] == BUS_SPACE_MEMIO
1220                  && ahd->bshs[0].maddr != NULL) {
1221                         iounmap(ahd->bshs[0].maddr);
1222                         release_mem_region(ahd->platform_data->mem_busaddr,
1223                                            0x1000);
1224                 }
1225                 if (ahd->platform_data->host)
1226                         scsi_host_put(ahd->platform_data->host);
1227
1228                 free(ahd->platform_data, M_DEVBUF);
1229         }
1230 }
1231
1232 void
1233 ahd_platform_init(struct ahd_softc *ahd)
1234 {
1235         /*
1236          * Lookup and commit any modified IO Cell options.
1237          */
1238         if (ahd->unit < NUM_ELEMENTS(aic79xx_iocell_info)) {
1239                 struct ahd_linux_iocell_opts *iocell_opts;
1240
1241                 iocell_opts = &aic79xx_iocell_info[ahd->unit];
1242                 if (iocell_opts->precomp != AIC79XX_DEFAULT_PRECOMP)
1243                         AHD_SET_PRECOMP(ahd, iocell_opts->precomp);
1244                 if (iocell_opts->slewrate != AIC79XX_DEFAULT_SLEWRATE)
1245                         AHD_SET_SLEWRATE(ahd, iocell_opts->slewrate);
1246                 if (iocell_opts->amplitude != AIC79XX_DEFAULT_AMPLITUDE)
1247                         AHD_SET_AMPLITUDE(ahd, iocell_opts->amplitude);
1248         }
1249
1250 }
1251
1252 void
1253 ahd_platform_freeze_devq(struct ahd_softc *ahd, struct scb *scb)
1254 {
1255         ahd_platform_abort_scbs(ahd, SCB_GET_TARGET(ahd, scb),
1256                                 SCB_GET_CHANNEL(ahd, scb),
1257                                 SCB_GET_LUN(scb), SCB_LIST_NULL,
1258                                 ROLE_UNKNOWN, CAM_REQUEUE_REQ);
1259 }
1260
1261 void
1262 ahd_platform_set_tags(struct ahd_softc *ahd, struct ahd_devinfo *devinfo,
1263                       ahd_queue_alg alg)
1264 {
1265         struct scsi_target *starget;
1266         struct ahd_linux_target *targ;
1267         struct ahd_linux_device *dev;
1268         struct scsi_device *sdev;
1269         int was_queuing;
1270         int now_queuing;
1271
1272         starget = ahd->platform_data->starget[devinfo->target];
1273         targ = scsi_transport_target_data(starget);
1274         BUG_ON(targ == NULL);
1275         sdev = targ->sdev[devinfo->lun];
1276         if (sdev == NULL)
1277                 return;
1278
1279         dev = scsi_transport_device_data(sdev);
1280
1281         if (dev == NULL)
1282                 return;
1283         was_queuing = dev->flags & (AHD_DEV_Q_BASIC|AHD_DEV_Q_TAGGED);
1284         switch (alg) {
1285         default:
1286         case AHD_QUEUE_NONE:
1287                 now_queuing = 0;
1288                 break;
1289         case AHD_QUEUE_BASIC:
1290                 now_queuing = AHD_DEV_Q_BASIC;
1291                 break;
1292         case AHD_QUEUE_TAGGED:
1293                 now_queuing = AHD_DEV_Q_TAGGED;
1294                 break;
1295         }
1296         if ((dev->flags & AHD_DEV_FREEZE_TIL_EMPTY) == 0
1297          && (was_queuing != now_queuing)
1298          && (dev->active != 0)) {
1299                 dev->flags |= AHD_DEV_FREEZE_TIL_EMPTY;
1300                 dev->qfrozen++;
1301         }
1302
1303         dev->flags &= ~(AHD_DEV_Q_BASIC|AHD_DEV_Q_TAGGED|AHD_DEV_PERIODIC_OTAG);
1304         if (now_queuing) {
1305                 u_int usertags;
1306
1307                 usertags = ahd_linux_user_tagdepth(ahd, devinfo);
1308                 if (!was_queuing) {
1309                         /*
1310                          * Start out agressively and allow our
1311                          * dynamic queue depth algorithm to take
1312                          * care of the rest.
1313                          */
1314                         dev->maxtags = usertags;
1315                         dev->openings = dev->maxtags - dev->active;
1316                 }
1317                 if (dev->maxtags == 0) {
1318                         /*
1319                          * Queueing is disabled by the user.
1320                          */
1321                         dev->openings = 1;
1322                 } else if (alg == AHD_QUEUE_TAGGED) {
1323                         dev->flags |= AHD_DEV_Q_TAGGED;
1324                         if (aic79xx_periodic_otag != 0)
1325                                 dev->flags |= AHD_DEV_PERIODIC_OTAG;
1326                 } else
1327                         dev->flags |= AHD_DEV_Q_BASIC;
1328         } else {
1329                 /* We can only have one opening. */
1330                 dev->maxtags = 0;
1331                 dev->openings =  1 - dev->active;
1332         }
1333
1334         switch ((dev->flags & (AHD_DEV_Q_BASIC|AHD_DEV_Q_TAGGED))) {
1335         case AHD_DEV_Q_BASIC:
1336                 scsi_adjust_queue_depth(sdev,
1337                                         MSG_SIMPLE_TASK,
1338                                         dev->openings + dev->active);
1339                 break;
1340         case AHD_DEV_Q_TAGGED:
1341                 scsi_adjust_queue_depth(sdev,
1342                                         MSG_ORDERED_TASK,
1343                                         dev->openings + dev->active);
1344                 break;
1345         default:
1346                 /*
1347                  * We allow the OS to queue 2 untagged transactions to
1348                  * us at any time even though we can only execute them
1349                  * serially on the controller/device.  This should
1350                  * remove some latency.
1351                  */
1352                 scsi_adjust_queue_depth(sdev,
1353                                         /*NON-TAGGED*/0,
1354                                         /*queue depth*/2);
1355                 break;
1356         }
1357 }
1358
1359 int
1360 ahd_platform_abort_scbs(struct ahd_softc *ahd, int target, char channel,
1361                         int lun, u_int tag, role_t role, uint32_t status)
1362 {
1363         return 0;
1364 }
1365
1366 static u_int
1367 ahd_linux_user_tagdepth(struct ahd_softc *ahd, struct ahd_devinfo *devinfo)
1368 {
1369         static int warned_user;
1370         u_int tags;
1371
1372         tags = 0;
1373         if ((ahd->user_discenable & devinfo->target_mask) != 0) {
1374                 if (ahd->unit >= NUM_ELEMENTS(aic79xx_tag_info)) {
1375
1376                         if (warned_user == 0) {
1377                                 printf(KERN_WARNING
1378 "aic79xx: WARNING: Insufficient tag_info instances\n"
1379 "aic79xx: for installed controllers.  Using defaults\n"
1380 "aic79xx: Please update the aic79xx_tag_info array in\n"
1381 "aic79xx: the aic79xx_osm.c source file.\n");
1382                                 warned_user++;
1383                         }
1384                         tags = AHD_MAX_QUEUE;
1385                 } else {
1386                         adapter_tag_info_t *tag_info;
1387
1388                         tag_info = &aic79xx_tag_info[ahd->unit];
1389                         tags = tag_info->tag_commands[devinfo->target_offset];
1390                         if (tags > AHD_MAX_QUEUE)
1391                                 tags = AHD_MAX_QUEUE;
1392                 }
1393         }
1394         return (tags);
1395 }
1396
1397 /*
1398  * Determines the queue depth for a given device.
1399  */
1400 static void
1401 ahd_linux_device_queue_depth(struct scsi_device *sdev)
1402 {
1403         struct  ahd_devinfo devinfo;
1404         u_int   tags;
1405         struct ahd_softc *ahd = *((struct ahd_softc **)sdev->host->hostdata);
1406
1407         ahd_compile_devinfo(&devinfo,
1408                             ahd->our_id,
1409                             sdev->sdev_target->id, sdev->lun,
1410                             sdev->sdev_target->channel == 0 ? 'A' : 'B',
1411                             ROLE_INITIATOR);
1412         tags = ahd_linux_user_tagdepth(ahd, &devinfo);
1413         if (tags != 0 && sdev->tagged_supported != 0) {
1414
1415                 ahd_set_tags(ahd, &devinfo, AHD_QUEUE_TAGGED);
1416                 ahd_print_devinfo(ahd, &devinfo);
1417                 printf("Tagged Queuing enabled.  Depth %d\n", tags);
1418         } else {
1419                 ahd_set_tags(ahd, &devinfo, AHD_QUEUE_NONE);
1420         }
1421 }
1422
1423 static int
1424 ahd_linux_run_command(struct ahd_softc *ahd, struct ahd_linux_device *dev,
1425                       struct scsi_cmnd *cmd)
1426 {
1427         struct   scb *scb;
1428         struct   hardware_scb *hscb;
1429         struct   ahd_initiator_tinfo *tinfo;
1430         struct   ahd_tmode_tstate *tstate;
1431         u_int    col_idx;
1432         uint16_t mask;
1433
1434         /*
1435          * Get an scb to use.
1436          */
1437         tinfo = ahd_fetch_transinfo(ahd, 'A', ahd->our_id,
1438                                     cmd->device->id, &tstate);
1439         if ((dev->flags & (AHD_DEV_Q_TAGGED|AHD_DEV_Q_BASIC)) == 0
1440          || (tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ) != 0) {
1441                 col_idx = AHD_NEVER_COL_IDX;
1442         } else {
1443                 col_idx = AHD_BUILD_COL_IDX(cmd->device->id,
1444                                             cmd->device->lun);
1445         }
1446         if ((scb = ahd_get_scb(ahd, col_idx)) == NULL) {
1447                 ahd->flags |= AHD_RESOURCE_SHORTAGE;
1448                 return SCSI_MLQUEUE_HOST_BUSY;
1449         }
1450
1451         scb->io_ctx = cmd;
1452         scb->platform_data->dev = dev;
1453         hscb = scb->hscb;
1454         cmd->host_scribble = (char *)scb;
1455
1456         /*
1457          * Fill out basics of the HSCB.
1458          */
1459         hscb->control = 0;
1460         hscb->scsiid = BUILD_SCSIID(ahd, cmd);
1461         hscb->lun = cmd->device->lun;
1462         scb->hscb->task_management = 0;
1463         mask = SCB_GET_TARGET_MASK(ahd, scb);
1464
1465         if ((ahd->user_discenable & mask) != 0)
1466                 hscb->control |= DISCENB;
1467
1468         if ((tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ) != 0)
1469                 scb->flags |= SCB_PACKETIZED;
1470
1471         if ((tstate->auto_negotiate & mask) != 0) {
1472                 scb->flags |= SCB_AUTO_NEGOTIATE;
1473                 scb->hscb->control |= MK_MESSAGE;
1474         }
1475
1476         if ((dev->flags & (AHD_DEV_Q_TAGGED|AHD_DEV_Q_BASIC)) != 0) {
1477                 int     msg_bytes;
1478                 uint8_t tag_msgs[2];
1479
1480                 msg_bytes = scsi_populate_tag_msg(cmd, tag_msgs);
1481                 if (msg_bytes && tag_msgs[0] != MSG_SIMPLE_TASK) {
1482                         hscb->control |= tag_msgs[0];
1483                         if (tag_msgs[0] == MSG_ORDERED_TASK)
1484                                 dev->commands_since_idle_or_otag = 0;
1485                 } else
1486                 if (dev->commands_since_idle_or_otag == AHD_OTAG_THRESH
1487                  && (dev->flags & AHD_DEV_Q_TAGGED) != 0) {
1488                         hscb->control |= MSG_ORDERED_TASK;
1489                         dev->commands_since_idle_or_otag = 0;
1490                 } else {
1491                         hscb->control |= MSG_SIMPLE_TASK;
1492                 }
1493         }
1494
1495         hscb->cdb_len = cmd->cmd_len;
1496         memcpy(hscb->shared_data.idata.cdb, cmd->cmnd, hscb->cdb_len);
1497
1498         scb->platform_data->xfer_len = 0;
1499         ahd_set_residual(scb, 0);
1500         ahd_set_sense_residual(scb, 0);
1501         scb->sg_count = 0;
1502         if (cmd->use_sg != 0) {
1503                 void    *sg;
1504                 struct   scatterlist *cur_seg;
1505                 u_int    nseg;
1506                 int      dir;
1507
1508                 cur_seg = (struct scatterlist *)cmd->request_buffer;
1509                 dir = cmd->sc_data_direction;
1510                 nseg = pci_map_sg(ahd->dev_softc, cur_seg,
1511                                   cmd->use_sg, dir);
1512                 scb->platform_data->xfer_len = 0;
1513                 for (sg = scb->sg_list; nseg > 0; nseg--, cur_seg++) {
1514                         dma_addr_t addr;
1515                         bus_size_t len;
1516
1517                         addr = sg_dma_address(cur_seg);
1518                         len = sg_dma_len(cur_seg);
1519                         scb->platform_data->xfer_len += len;
1520                         sg = ahd_sg_setup(ahd, scb, sg, addr, len,
1521                                           /*last*/nseg == 1);
1522                 }
1523         } else if (cmd->request_bufflen != 0) {
1524                 void *sg;
1525                 dma_addr_t addr;
1526                 int dir;
1527
1528                 sg = scb->sg_list;
1529                 dir = cmd->sc_data_direction;
1530                 addr = pci_map_single(ahd->dev_softc,
1531                                       cmd->request_buffer,
1532                                       cmd->request_bufflen, dir);
1533                 scb->platform_data->xfer_len = cmd->request_bufflen;
1534                 scb->platform_data->buf_busaddr = addr;
1535                 sg = ahd_sg_setup(ahd, scb, sg, addr,
1536                                   cmd->request_bufflen, /*last*/TRUE);
1537         }
1538
1539         LIST_INSERT_HEAD(&ahd->pending_scbs, scb, pending_links);
1540         dev->openings--;
1541         dev->active++;
1542         dev->commands_issued++;
1543
1544         if ((dev->flags & AHD_DEV_PERIODIC_OTAG) != 0)
1545                 dev->commands_since_idle_or_otag++;
1546         scb->flags |= SCB_ACTIVE;
1547         ahd_queue_scb(ahd, scb);
1548
1549         return 0;
1550 }
1551
1552 /*
1553  * SCSI controller interrupt handler.
1554  */
1555 irqreturn_t
1556 ahd_linux_isr(int irq, void *dev_id, struct pt_regs * regs)
1557 {
1558         struct  ahd_softc *ahd;
1559         u_long  flags;
1560         int     ours;
1561
1562         ahd = (struct ahd_softc *) dev_id;
1563         ahd_lock(ahd, &flags);
1564         ours = ahd_intr(ahd);
1565         ahd_unlock(ahd, &flags);
1566         return IRQ_RETVAL(ours);
1567 }
1568
1569 void
1570 ahd_platform_flushwork(struct ahd_softc *ahd)
1571 {
1572
1573 }
1574
1575 void
1576 ahd_send_async(struct ahd_softc *ahd, char channel,
1577                u_int target, u_int lun, ac_code code, void *arg)
1578 {
1579         switch (code) {
1580         case AC_TRANSFER_NEG:
1581         {
1582                 char    buf[80];
1583                 struct  scsi_target *starget;
1584                 struct  ahd_linux_target *targ;
1585                 struct  info_str info;
1586                 struct  ahd_initiator_tinfo *tinfo;
1587                 struct  ahd_tmode_tstate *tstate;
1588                 unsigned int target_ppr_options;
1589
1590                 BUG_ON(target == CAM_TARGET_WILDCARD);
1591
1592                 info.buffer = buf;
1593                 info.length = sizeof(buf);
1594                 info.offset = 0;
1595                 info.pos = 0;
1596                 tinfo = ahd_fetch_transinfo(ahd, channel, ahd->our_id,
1597                                             target, &tstate);
1598
1599                 /*
1600                  * Don't bother reporting results while
1601                  * negotiations are still pending.
1602                  */
1603                 if (tinfo->curr.period != tinfo->goal.period
1604                  || tinfo->curr.width != tinfo->goal.width
1605                  || tinfo->curr.offset != tinfo->goal.offset
1606                  || tinfo->curr.ppr_options != tinfo->goal.ppr_options)
1607                         if (bootverbose == 0)
1608                                 break;
1609
1610                 /*
1611                  * Don't bother reporting results that
1612                  * are identical to those last reported.
1613                  */
1614                 starget = ahd->platform_data->starget[target];
1615                 if (starget == NULL)
1616                         break;
1617                 targ = scsi_transport_target_data(starget);
1618
1619                 target_ppr_options =
1620                         (spi_dt(starget) ? MSG_EXT_PPR_DT_REQ : 0)
1621                         + (spi_qas(starget) ? MSG_EXT_PPR_QAS_REQ : 0)
1622                         + (spi_iu(starget) ?  MSG_EXT_PPR_IU_REQ : 0)
1623                         + (spi_rd_strm(starget) ? MSG_EXT_PPR_RD_STRM : 0)
1624                         + (spi_pcomp_en(starget) ? MSG_EXT_PPR_PCOMP_EN : 0)
1625                         + (spi_rti(starget) ? MSG_EXT_PPR_RTI : 0)
1626                         + (spi_wr_flow(starget) ? MSG_EXT_PPR_WR_FLOW : 0)
1627                         + (spi_hold_mcs(starget) ? MSG_EXT_PPR_HOLD_MCS : 0);
1628
1629                 if (tinfo->curr.period == spi_period(starget)
1630                     && tinfo->curr.width == spi_width(starget)
1631                     && tinfo->curr.offset == spi_offset(starget)
1632                  && tinfo->curr.ppr_options == target_ppr_options)
1633                         if (bootverbose == 0)
1634                                 break;
1635
1636                 spi_period(starget) = tinfo->curr.period;
1637                 spi_width(starget) = tinfo->curr.width;
1638                 spi_offset(starget) = tinfo->curr.offset;
1639                 spi_dt(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_DT_REQ ? 1 : 0;
1640                 spi_qas(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_QAS_REQ ? 1 : 0;
1641                 spi_iu(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ ? 1 : 0;
1642                 spi_rd_strm(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_RD_STRM ? 1 : 0;
1643                 spi_pcomp_en(starget) =  tinfo->curr.ppr_options & MSG_EXT_PPR_PCOMP_EN ? 1 : 0;
1644                 spi_rti(starget) =  tinfo->curr.ppr_options &  MSG_EXT_PPR_RTI ? 1 : 0;
1645                 spi_wr_flow(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_WR_FLOW ? 1 : 0;
1646                 spi_hold_mcs(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_HOLD_MCS ? 1 : 0;
1647                 spi_display_xfer_agreement(starget);
1648                 break;
1649         }
1650         case AC_SENT_BDR:
1651         {
1652                 WARN_ON(lun != CAM_LUN_WILDCARD);
1653                 scsi_report_device_reset(ahd->platform_data->host,
1654                                          channel - 'A', target);
1655                 break;
1656         }
1657         case AC_BUS_RESET:
1658                 if (ahd->platform_data->host != NULL) {
1659                         scsi_report_bus_reset(ahd->platform_data->host,
1660                                               channel - 'A');
1661                 }
1662                 break;
1663         default:
1664                 panic("ahd_send_async: Unexpected async event");
1665         }
1666 }
1667
1668 /*
1669  * Calls the higher level scsi done function and frees the scb.
1670  */
1671 void
1672 ahd_done(struct ahd_softc *ahd, struct scb *scb)
1673 {
1674         struct scsi_cmnd *cmd;
1675         struct    ahd_linux_device *dev;
1676
1677         if ((scb->flags & SCB_ACTIVE) == 0) {
1678                 printf("SCB %d done'd twice\n", SCB_GET_TAG(scb));
1679                 ahd_dump_card_state(ahd);
1680                 panic("Stopping for safety");
1681         }
1682         LIST_REMOVE(scb, pending_links);
1683         cmd = scb->io_ctx;
1684         dev = scb->platform_data->dev;
1685         dev->active--;
1686         dev->openings++;
1687         if ((cmd->result & (CAM_DEV_QFRZN << 16)) != 0) {
1688                 cmd->result &= ~(CAM_DEV_QFRZN << 16);
1689                 dev->qfrozen--;
1690         }
1691         ahd_linux_unmap_scb(ahd, scb);
1692
1693         /*
1694          * Guard against stale sense data.
1695          * The Linux mid-layer assumes that sense
1696          * was retrieved anytime the first byte of
1697          * the sense buffer looks "sane".
1698          */
1699         cmd->sense_buffer[0] = 0;
1700         if (ahd_get_transaction_status(scb) == CAM_REQ_INPROG) {
1701                 uint32_t amount_xferred;
1702
1703                 amount_xferred =
1704                     ahd_get_transfer_length(scb) - ahd_get_residual(scb);
1705                 if ((scb->flags & SCB_TRANSMISSION_ERROR) != 0) {
1706 #ifdef AHD_DEBUG
1707                         if ((ahd_debug & AHD_SHOW_MISC) != 0) {
1708                                 ahd_print_path(ahd, scb);
1709                                 printf("Set CAM_UNCOR_PARITY\n");
1710                         }
1711 #endif
1712                         ahd_set_transaction_status(scb, CAM_UNCOR_PARITY);
1713 #ifdef AHD_REPORT_UNDERFLOWS
1714                 /*
1715                  * This code is disabled by default as some
1716                  * clients of the SCSI system do not properly
1717                  * initialize the underflow parameter.  This
1718                  * results in spurious termination of commands
1719                  * that complete as expected (e.g. underflow is
1720                  * allowed as command can return variable amounts
1721                  * of data.
1722                  */
1723                 } else if (amount_xferred < scb->io_ctx->underflow) {
1724                         u_int i;
1725
1726                         ahd_print_path(ahd, scb);
1727                         printf("CDB:");
1728                         for (i = 0; i < scb->io_ctx->cmd_len; i++)
1729                                 printf(" 0x%x", scb->io_ctx->cmnd[i]);
1730                         printf("\n");
1731                         ahd_print_path(ahd, scb);
1732                         printf("Saw underflow (%ld of %ld bytes). "
1733                                "Treated as error\n",
1734                                 ahd_get_residual(scb),
1735                                 ahd_get_transfer_length(scb));
1736                         ahd_set_transaction_status(scb, CAM_DATA_RUN_ERR);
1737 #endif
1738                 } else {
1739                         ahd_set_transaction_status(scb, CAM_REQ_CMP);
1740                 }
1741         } else if (ahd_get_transaction_status(scb) == CAM_SCSI_STATUS_ERROR) {
1742                 ahd_linux_handle_scsi_status(ahd, cmd->device, scb);
1743         }
1744
1745         if (dev->openings == 1
1746          && ahd_get_transaction_status(scb) == CAM_REQ_CMP
1747          && ahd_get_scsi_status(scb) != SCSI_STATUS_QUEUE_FULL)
1748                 dev->tag_success_count++;
1749         /*
1750          * Some devices deal with temporary internal resource
1751          * shortages by returning queue full.  When the queue
1752          * full occurrs, we throttle back.  Slowly try to get
1753          * back to our previous queue depth.
1754          */
1755         if ((dev->openings + dev->active) < dev->maxtags
1756          && dev->tag_success_count > AHD_TAG_SUCCESS_INTERVAL) {
1757                 dev->tag_success_count = 0;
1758                 dev->openings++;
1759         }
1760
1761         if (dev->active == 0)
1762                 dev->commands_since_idle_or_otag = 0;
1763
1764         if ((scb->flags & SCB_RECOVERY_SCB) != 0) {
1765                 printf("Recovery SCB completes\n");
1766                 if (ahd_get_transaction_status(scb) == CAM_BDR_SENT
1767                  || ahd_get_transaction_status(scb) == CAM_REQ_ABORTED)
1768                         ahd_set_transaction_status(scb, CAM_CMD_TIMEOUT);
1769                 if ((ahd->platform_data->flags & AHD_SCB_UP_EH_SEM) != 0) {
1770                         ahd->platform_data->flags &= ~AHD_SCB_UP_EH_SEM;
1771                         up(&ahd->platform_data->eh_sem);
1772                 }
1773         }
1774
1775         ahd_free_scb(ahd, scb);
1776         ahd_linux_queue_cmd_complete(ahd, cmd);
1777 }
1778
1779 static void
1780 ahd_linux_handle_scsi_status(struct ahd_softc *ahd,
1781                              struct scsi_device *sdev, struct scb *scb)
1782 {
1783         struct  ahd_devinfo devinfo;
1784         struct ahd_linux_device *dev = scsi_transport_device_data(sdev);
1785
1786         ahd_compile_devinfo(&devinfo,
1787                             ahd->our_id,
1788                             sdev->sdev_target->id, sdev->lun,
1789                             sdev->sdev_target->channel == 0 ? 'A' : 'B',
1790                             ROLE_INITIATOR);
1791
1792         /*
1793          * We don't currently trust the mid-layer to
1794          * properly deal with queue full or busy.  So,
1795          * when one occurs, we tell the mid-layer to
1796          * unconditionally requeue the command to us
1797          * so that we can retry it ourselves.  We also
1798          * implement our own throttling mechanism so
1799          * we don't clobber the device with too many
1800          * commands.
1801          */
1802         switch (ahd_get_scsi_status(scb)) {
1803         default:
1804                 break;
1805         case SCSI_STATUS_CHECK_COND:
1806         case SCSI_STATUS_CMD_TERMINATED:
1807         {
1808                 struct scsi_cmnd *cmd;
1809
1810                 /*
1811                  * Copy sense information to the OS's cmd
1812                  * structure if it is available.
1813                  */
1814                 cmd = scb->io_ctx;
1815                 if ((scb->flags & (SCB_SENSE|SCB_PKT_SENSE)) != 0) {
1816                         struct scsi_status_iu_header *siu;
1817                         u_int sense_size;
1818                         u_int sense_offset;
1819
1820                         if (scb->flags & SCB_SENSE) {
1821                                 sense_size = MIN(sizeof(struct scsi_sense_data)
1822                                                - ahd_get_sense_residual(scb),
1823                                                  sizeof(cmd->sense_buffer));
1824                                 sense_offset = 0;
1825                         } else {
1826                                 /*
1827                                  * Copy only the sense data into the provided
1828                                  * buffer.
1829                                  */
1830                                 siu = (struct scsi_status_iu_header *)
1831                                     scb->sense_data;
1832                                 sense_size = MIN(scsi_4btoul(siu->sense_length),
1833                                                 sizeof(cmd->sense_buffer));
1834                                 sense_offset = SIU_SENSE_OFFSET(siu);
1835                         }
1836
1837                         memset(cmd->sense_buffer, 0, sizeof(cmd->sense_buffer));
1838                         memcpy(cmd->sense_buffer,
1839                                ahd_get_sense_buf(ahd, scb)
1840                                + sense_offset, sense_size);
1841                         cmd->result |= (DRIVER_SENSE << 24);
1842
1843 #ifdef AHD_DEBUG
1844                         if (ahd_debug & AHD_SHOW_SENSE) {
1845                                 int i;
1846
1847                                 printf("Copied %d bytes of sense data at %d:",
1848                                        sense_size, sense_offset);
1849                                 for (i = 0; i < sense_size; i++) {
1850                                         if ((i & 0xF) == 0)
1851                                                 printf("\n");
1852                                         printf("0x%x ", cmd->sense_buffer[i]);
1853                                 }
1854                                 printf("\n");
1855                         }
1856 #endif
1857                 }
1858                 break;
1859         }
1860         case SCSI_STATUS_QUEUE_FULL:
1861                 /*
1862                  * By the time the core driver has returned this
1863                  * command, all other commands that were queued
1864                  * to us but not the device have been returned.
1865                  * This ensures that dev->active is equal to
1866                  * the number of commands actually queued to
1867                  * the device.
1868                  */
1869                 dev->tag_success_count = 0;
1870                 if (dev->active != 0) {
1871                         /*
1872                          * Drop our opening count to the number
1873                          * of commands currently outstanding.
1874                          */
1875                         dev->openings = 0;
1876 #ifdef AHD_DEBUG
1877                         if ((ahd_debug & AHD_SHOW_QFULL) != 0) {
1878                                 ahd_print_path(ahd, scb);
1879                                 printf("Dropping tag count to %d\n",
1880                                        dev->active);
1881                         }
1882 #endif
1883                         if (dev->active == dev->tags_on_last_queuefull) {
1884
1885                                 dev->last_queuefull_same_count++;
1886                                 /*
1887                                  * If we repeatedly see a queue full
1888                                  * at the same queue depth, this
1889                                  * device has a fixed number of tag
1890                                  * slots.  Lock in this tag depth
1891                                  * so we stop seeing queue fulls from
1892                                  * this device.
1893                                  */
1894                                 if (dev->last_queuefull_same_count
1895                                  == AHD_LOCK_TAGS_COUNT) {
1896                                         dev->maxtags = dev->active;
1897                                         ahd_print_path(ahd, scb);
1898                                         printf("Locking max tag count at %d\n",
1899                                                dev->active);
1900                                 }
1901                         } else {
1902                                 dev->tags_on_last_queuefull = dev->active;
1903                                 dev->last_queuefull_same_count = 0;
1904                         }
1905                         ahd_set_transaction_status(scb, CAM_REQUEUE_REQ);
1906                         ahd_set_scsi_status(scb, SCSI_STATUS_OK);
1907                         ahd_platform_set_tags(ahd, &devinfo,
1908                                      (dev->flags & AHD_DEV_Q_BASIC)
1909                                    ? AHD_QUEUE_BASIC : AHD_QUEUE_TAGGED);
1910                         break;
1911                 }
1912                 /*
1913                  * Drop down to a single opening, and treat this
1914                  * as if the target returned BUSY SCSI status.
1915                  */
1916                 dev->openings = 1;
1917                 ahd_platform_set_tags(ahd, &devinfo,
1918                              (dev->flags & AHD_DEV_Q_BASIC)
1919                            ? AHD_QUEUE_BASIC : AHD_QUEUE_TAGGED);
1920                 ahd_set_scsi_status(scb, SCSI_STATUS_BUSY);
1921         }
1922 }
1923
1924 static void
1925 ahd_linux_queue_cmd_complete(struct ahd_softc *ahd, struct scsi_cmnd *cmd)
1926 {
1927         /*
1928          * Map CAM error codes into Linux Error codes.  We
1929          * avoid the conversion so that the DV code has the
1930          * full error information available when making
1931          * state change decisions.
1932          */
1933         {
1934                 uint32_t status;
1935                 u_int new_status;
1936
1937                 status = ahd_cmd_get_transaction_status(cmd);
1938                 switch (status) {
1939                 case CAM_REQ_INPROG:
1940                 case CAM_REQ_CMP:
1941                 case CAM_SCSI_STATUS_ERROR:
1942                         new_status = DID_OK;
1943                         break;
1944                 case CAM_REQ_ABORTED:
1945                         new_status = DID_ABORT;
1946                         break;
1947                 case CAM_BUSY:
1948                         new_status = DID_BUS_BUSY;
1949                         break;
1950                 case CAM_REQ_INVALID:
1951                 case CAM_PATH_INVALID:
1952                         new_status = DID_BAD_TARGET;
1953                         break;
1954                 case CAM_SEL_TIMEOUT:
1955                         new_status = DID_NO_CONNECT;
1956                         break;
1957                 case CAM_SCSI_BUS_RESET:
1958                 case CAM_BDR_SENT:
1959                         new_status = DID_RESET;
1960                         break;
1961                 case CAM_UNCOR_PARITY:
1962                         new_status = DID_PARITY;
1963                         break;
1964                 case CAM_CMD_TIMEOUT:
1965                         new_status = DID_TIME_OUT;
1966                         break;
1967                 case CAM_UA_ABORT:
1968                 case CAM_REQ_CMP_ERR:
1969                 case CAM_AUTOSENSE_FAIL:
1970                 case CAM_NO_HBA:
1971                 case CAM_DATA_RUN_ERR:
1972                 case CAM_UNEXP_BUSFREE:
1973                 case CAM_SEQUENCE_FAIL:
1974                 case CAM_CCB_LEN_ERR:
1975                 case CAM_PROVIDE_FAIL:
1976                 case CAM_REQ_TERMIO:
1977                 case CAM_UNREC_HBA_ERROR:
1978                 case CAM_REQ_TOO_BIG:
1979                         new_status = DID_ERROR;
1980                         break;
1981                 case CAM_REQUEUE_REQ:
1982                         new_status = DID_REQUEUE;
1983                         break;
1984                 default:
1985                         /* We should never get here */
1986                         new_status = DID_ERROR;
1987                         break;
1988                 }
1989
1990                 ahd_cmd_set_transaction_status(cmd, new_status);
1991         }
1992
1993         cmd->scsi_done(cmd);
1994 }
1995
1996 static void
1997 ahd_linux_sem_timeout(u_long arg)
1998 {
1999         struct  ahd_softc *ahd;
2000         u_long  s;
2001
2002         ahd = (struct ahd_softc *)arg;
2003
2004         ahd_lock(ahd, &s);
2005         if ((ahd->platform_data->flags & AHD_SCB_UP_EH_SEM) != 0) {
2006                 ahd->platform_data->flags &= ~AHD_SCB_UP_EH_SEM;
2007                 up(&ahd->platform_data->eh_sem);
2008         }
2009         ahd_unlock(ahd, &s);
2010 }
2011
2012 void
2013 ahd_freeze_simq(struct ahd_softc *ahd)
2014 {
2015         ahd->platform_data->qfrozen++;
2016         if (ahd->platform_data->qfrozen == 1) {
2017                 scsi_block_requests(ahd->platform_data->host);
2018                 ahd_platform_abort_scbs(ahd, CAM_TARGET_WILDCARD, ALL_CHANNELS,
2019                                         CAM_LUN_WILDCARD, SCB_LIST_NULL,
2020                                         ROLE_INITIATOR, CAM_REQUEUE_REQ);
2021         }
2022 }
2023
2024 void
2025 ahd_release_simq(struct ahd_softc *ahd)
2026 {
2027         u_long s;
2028         int    unblock_reqs;
2029
2030         unblock_reqs = 0;
2031         ahd_lock(ahd, &s);
2032         if (ahd->platform_data->qfrozen > 0)
2033                 ahd->platform_data->qfrozen--;
2034         if (ahd->platform_data->qfrozen == 0) {
2035                 unblock_reqs = 1;
2036         }
2037         ahd_unlock(ahd, &s);
2038         /*
2039          * There is still a race here.  The mid-layer
2040          * should keep its own freeze count and use
2041          * a bottom half handler to run the queues
2042          * so we can unblock with our own lock held.
2043          */
2044         if (unblock_reqs)
2045                 scsi_unblock_requests(ahd->platform_data->host);
2046 }
2047
2048 static int
2049 ahd_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag)
2050 {
2051         struct ahd_softc *ahd;
2052         struct ahd_linux_device *dev;
2053         struct scb *pending_scb;
2054         u_int  saved_scbptr;
2055         u_int  active_scbptr;
2056         u_int  last_phase;
2057         u_int  saved_scsiid;
2058         u_int  cdb_byte;
2059         int    retval;
2060         int    was_paused;
2061         int    paused;
2062         int    wait;
2063         int    disconnected;
2064         ahd_mode_state saved_modes;
2065
2066         pending_scb = NULL;
2067         paused = FALSE;
2068         wait = FALSE;
2069         ahd = *(struct ahd_softc **)cmd->device->host->hostdata;
2070
2071         scmd_printk(KERN_INFO, cmd,
2072                "Attempting to queue a%s message:",
2073                flag == SCB_ABORT ? "n ABORT" : " TARGET RESET");
2074
2075         printf("CDB:");
2076         for (cdb_byte = 0; cdb_byte < cmd->cmd_len; cdb_byte++)
2077                 printf(" 0x%x", cmd->cmnd[cdb_byte]);
2078         printf("\n");
2079
2080         spin_lock_irq(&ahd->platform_data->spin_lock);
2081
2082         /*
2083          * First determine if we currently own this command.
2084          * Start by searching the device queue.  If not found
2085          * there, check the pending_scb list.  If not found
2086          * at all, and the system wanted us to just abort the
2087          * command, return success.
2088          */
2089         dev = scsi_transport_device_data(cmd->device);
2090
2091         if (dev == NULL) {
2092                 /*
2093                  * No target device for this command exists,
2094                  * so we must not still own the command.
2095                  */
2096                 scmd_printk(KERN_INFO, cmd, "Is not an active device\n");
2097                 retval = SUCCESS;
2098                 goto no_cmd;
2099         }
2100
2101         /*
2102          * See if we can find a matching cmd in the pending list.
2103          */
2104         LIST_FOREACH(pending_scb, &ahd->pending_scbs, pending_links) {
2105                 if (pending_scb->io_ctx == cmd)
2106                         break;
2107         }
2108
2109         if (pending_scb == NULL && flag == SCB_DEVICE_RESET) {
2110
2111                 /* Any SCB for this device will do for a target reset */
2112                 LIST_FOREACH(pending_scb, &ahd->pending_scbs, pending_links) {
2113                         if (ahd_match_scb(ahd, pending_scb,
2114                                           scmd_id(cmd),
2115                                           scmd_channel(cmd) + 'A',
2116                                           CAM_LUN_WILDCARD,
2117                                           SCB_LIST_NULL, ROLE_INITIATOR) == 0)
2118                                 break;
2119                 }
2120         }
2121
2122         if (pending_scb == NULL) {
2123                 scmd_printk(KERN_INFO, cmd, "Command not found\n");
2124                 goto no_cmd;
2125         }
2126
2127         if ((pending_scb->flags & SCB_RECOVERY_SCB) != 0) {
2128                 /*
2129                  * We can't queue two recovery actions using the same SCB
2130                  */
2131                 retval = FAILED;
2132                 goto  done;
2133         }
2134
2135         /*
2136          * Ensure that the card doesn't do anything
2137          * behind our back.  Also make sure that we
2138          * didn't "just" miss an interrupt that would
2139          * affect this cmd.
2140          */
2141         was_paused = ahd_is_paused(ahd);
2142         ahd_pause_and_flushwork(ahd);
2143         paused = TRUE;
2144
2145         if ((pending_scb->flags & SCB_ACTIVE) == 0) {
2146                 scmd_printk(KERN_INFO, cmd, "Command already completed\n");
2147                 goto no_cmd;
2148         }
2149
2150         printf("%s: At time of recovery, card was %spaused\n",
2151                ahd_name(ahd), was_paused ? "" : "not ");
2152         ahd_dump_card_state(ahd);
2153
2154         disconnected = TRUE;
2155         if (flag == SCB_ABORT) {
2156                 if (ahd_search_qinfifo(ahd, cmd->device->id,
2157                                        cmd->device->channel + 'A',
2158                                        cmd->device->lun,
2159                                        pending_scb->hscb->tag,
2160                                        ROLE_INITIATOR, CAM_REQ_ABORTED,
2161                                        SEARCH_COMPLETE) > 0) {
2162                         printf("%s:%d:%d:%d: Cmd aborted from QINFIFO\n",
2163                                ahd_name(ahd), cmd->device->channel,
2164                                cmd->device->id, cmd->device->lun);
2165                         retval = SUCCESS;
2166                         goto done;
2167                 }
2168         } else if (ahd_search_qinfifo(ahd, cmd->device->id,
2169                                       cmd->device->channel + 'A',
2170                                       cmd->device->lun, pending_scb->hscb->tag,
2171                                       ROLE_INITIATOR, /*status*/0,
2172                                       SEARCH_COUNT) > 0) {
2173                 disconnected = FALSE;
2174         }
2175
2176         saved_modes = ahd_save_modes(ahd);
2177         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
2178         last_phase = ahd_inb(ahd, LASTPHASE);
2179         saved_scbptr = ahd_get_scbptr(ahd);
2180         active_scbptr = saved_scbptr;
2181         if (disconnected && (ahd_inb(ahd, SEQ_FLAGS) & NOT_IDENTIFIED) == 0) {
2182                 struct scb *bus_scb;
2183
2184                 bus_scb = ahd_lookup_scb(ahd, active_scbptr);
2185                 if (bus_scb == pending_scb)
2186                         disconnected = FALSE;
2187                 else if (flag != SCB_ABORT
2188                          && ahd_inb(ahd, SAVED_SCSIID) == pending_scb->hscb->scsiid
2189                          && ahd_inb(ahd, SAVED_LUN) == SCB_GET_LUN(pending_scb))
2190                         disconnected = FALSE;
2191         }
2192
2193         /*
2194          * At this point, pending_scb is the scb associated with the
2195          * passed in command.  That command is currently active on the
2196          * bus or is in the disconnected state.
2197          */
2198         saved_scsiid = ahd_inb(ahd, SAVED_SCSIID);
2199         if (last_phase != P_BUSFREE
2200          && (SCB_GET_TAG(pending_scb) == active_scbptr
2201              || (flag == SCB_DEVICE_RESET
2202                  && SCSIID_TARGET(ahd, saved_scsiid) == scmd_id(cmd)))) {
2203
2204                 /*
2205                  * We're active on the bus, so assert ATN
2206                  * and hope that the target responds.
2207                  */
2208                 pending_scb = ahd_lookup_scb(ahd, active_scbptr);
2209                 pending_scb->flags |= SCB_RECOVERY_SCB|flag;
2210                 ahd_outb(ahd, MSG_OUT, HOST_MSG);
2211                 ahd_outb(ahd, SCSISIGO, last_phase|ATNO);
2212                 scmd_printk(KERN_INFO, cmd, "Device is active, asserting ATN\n");
2213                 wait = TRUE;
2214         } else if (disconnected) {
2215
2216                 /*
2217                  * Actually re-queue this SCB in an attempt
2218                  * to select the device before it reconnects.
2219                  */
2220                 pending_scb->flags |= SCB_RECOVERY_SCB|SCB_ABORT;
2221                 ahd_set_scbptr(ahd, SCB_GET_TAG(pending_scb));
2222                 pending_scb->hscb->cdb_len = 0;
2223                 pending_scb->hscb->task_attribute = 0;
2224                 pending_scb->hscb->task_management = SIU_TASKMGMT_ABORT_TASK;
2225
2226                 if ((pending_scb->flags & SCB_PACKETIZED) != 0) {
2227                         /*
2228                          * Mark the SCB has having an outstanding
2229                          * task management function.  Should the command
2230                          * complete normally before the task management
2231                          * function can be sent, the host will be notified
2232                          * to abort our requeued SCB.
2233                          */
2234                         ahd_outb(ahd, SCB_TASK_MANAGEMENT,
2235                                  pending_scb->hscb->task_management);
2236                 } else {
2237                         /*
2238                          * If non-packetized, set the MK_MESSAGE control
2239                          * bit indicating that we desire to send a message.
2240                          * We also set the disconnected flag since there is
2241                          * no guarantee that our SCB control byte matches
2242                          * the version on the card.  We don't want the
2243                          * sequencer to abort the command thinking an
2244                          * unsolicited reselection occurred.
2245                          */
2246                         pending_scb->hscb->control |= MK_MESSAGE|DISCONNECTED;
2247
2248                         /*
2249                          * The sequencer will never re-reference the
2250                          * in-core SCB.  To make sure we are notified
2251                          * during reslection, set the MK_MESSAGE flag in
2252                          * the card's copy of the SCB.
2253                          */
2254                         ahd_outb(ahd, SCB_CONTROL,
2255                                  ahd_inb(ahd, SCB_CONTROL)|MK_MESSAGE);
2256                 }
2257
2258                 /*
2259                  * Clear out any entries in the QINFIFO first
2260                  * so we are the next SCB for this target
2261                  * to run.
2262                  */
2263                 ahd_search_qinfifo(ahd, cmd->device->id,
2264                                    cmd->device->channel + 'A', cmd->device->lun,
2265                                    SCB_LIST_NULL, ROLE_INITIATOR,
2266                                    CAM_REQUEUE_REQ, SEARCH_COMPLETE);
2267                 ahd_qinfifo_requeue_tail(ahd, pending_scb);
2268                 ahd_set_scbptr(ahd, saved_scbptr);
2269                 ahd_print_path(ahd, pending_scb);
2270                 printf("Device is disconnected, re-queuing SCB\n");
2271                 wait = TRUE;
2272         } else {
2273                 scmd_printk(KERN_INFO, cmd, "Unable to deliver message\n");
2274                 retval = FAILED;
2275                 goto done;
2276         }
2277
2278 no_cmd:
2279         /*
2280          * Our assumption is that if we don't have the command, no
2281          * recovery action was required, so we return success.  Again,
2282          * the semantics of the mid-layer recovery engine are not
2283          * well defined, so this may change in time.
2284          */
2285         retval = SUCCESS;
2286 done:
2287         if (paused)
2288                 ahd_unpause(ahd);
2289         if (wait) {
2290                 struct timer_list timer;
2291                 int ret;
2292
2293                 ahd->platform_data->flags |= AHD_SCB_UP_EH_SEM;
2294                 spin_unlock_irq(&ahd->platform_data->spin_lock);
2295                 init_timer(&timer);
2296                 timer.data = (u_long)ahd;
2297                 timer.expires = jiffies + (5 * HZ);
2298                 timer.function = ahd_linux_sem_timeout;
2299                 add_timer(&timer);
2300                 printf("Recovery code sleeping\n");
2301                 down(&ahd->platform_data->eh_sem);
2302                 printf("Recovery code awake\n");
2303                 ret = del_timer_sync(&timer);
2304                 if (ret == 0) {
2305                         printf("Timer Expired\n");
2306                         retval = FAILED;
2307                 }
2308                 spin_lock_irq(&ahd->platform_data->spin_lock);
2309         }
2310         spin_unlock_irq(&ahd->platform_data->spin_lock);
2311         return (retval);
2312 }
2313
2314 static void ahd_linux_set_width(struct scsi_target *starget, int width)
2315 {
2316         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2317         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2318         struct ahd_devinfo devinfo;
2319         unsigned long flags;
2320
2321         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2322                             starget->channel + 'A', ROLE_INITIATOR);
2323         ahd_lock(ahd, &flags);
2324         ahd_set_width(ahd, &devinfo, width, AHD_TRANS_GOAL, FALSE);
2325         ahd_unlock(ahd, &flags);
2326 }
2327
2328 static void ahd_linux_set_period(struct scsi_target *starget, int period)
2329 {
2330         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2331         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2332         struct ahd_tmode_tstate *tstate;
2333         struct ahd_initiator_tinfo *tinfo
2334                 = ahd_fetch_transinfo(ahd,
2335                                       starget->channel + 'A',
2336                                       shost->this_id, starget->id, &tstate);
2337         struct ahd_devinfo devinfo;
2338         unsigned int ppr_options = tinfo->goal.ppr_options;
2339         unsigned int dt;
2340         unsigned long flags;
2341         unsigned long offset = tinfo->goal.offset;
2342
2343 #ifdef AHD_DEBUG
2344         if ((ahd_debug & AHD_SHOW_DV) != 0)
2345                 printf("%s: set period to %d\n", ahd_name(ahd), period);
2346 #endif
2347         if (offset == 0)
2348                 offset = MAX_OFFSET;
2349
2350         if (period < 8)
2351                 period = 8;
2352         if (period < 10) {
2353                 ppr_options |= MSG_EXT_PPR_DT_REQ;
2354                 if (period == 8)
2355                         ppr_options |= MSG_EXT_PPR_IU_REQ;
2356         }
2357
2358         dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2359
2360         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2361                             starget->channel + 'A', ROLE_INITIATOR);
2362
2363         /* all PPR requests apart from QAS require wide transfers */
2364         if (ppr_options & ~MSG_EXT_PPR_QAS_REQ) {
2365                 if (spi_width(starget) == 0)
2366                         ppr_options &= MSG_EXT_PPR_QAS_REQ;
2367         }
2368
2369         ahd_find_syncrate(ahd, &period, &ppr_options,
2370                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2371
2372         ahd_lock(ahd, &flags);
2373         ahd_set_syncrate(ahd, &devinfo, period, offset,
2374                          ppr_options, AHD_TRANS_GOAL, FALSE);
2375         ahd_unlock(ahd, &flags);
2376 }
2377
2378 static void ahd_linux_set_offset(struct scsi_target *starget, int offset)
2379 {
2380         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2381         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2382         struct ahd_tmode_tstate *tstate;
2383         struct ahd_initiator_tinfo *tinfo
2384                 = ahd_fetch_transinfo(ahd,
2385                                       starget->channel + 'A',
2386                                       shost->this_id, starget->id, &tstate);
2387         struct ahd_devinfo devinfo;
2388         unsigned int ppr_options = 0;
2389         unsigned int period = 0;
2390         unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2391         unsigned long flags;
2392
2393 #ifdef AHD_DEBUG
2394         if ((ahd_debug & AHD_SHOW_DV) != 0)
2395                 printf("%s: set offset to %d\n", ahd_name(ahd), offset);
2396 #endif
2397
2398         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2399                             starget->channel + 'A', ROLE_INITIATOR);
2400         if (offset != 0) {
2401                 period = tinfo->goal.period;
2402                 ppr_options = tinfo->goal.ppr_options;
2403                 ahd_find_syncrate(ahd, &period, &ppr_options,
2404                                   dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2405         }
2406
2407         ahd_lock(ahd, &flags);
2408         ahd_set_syncrate(ahd, &devinfo, period, offset, ppr_options,
2409                          AHD_TRANS_GOAL, FALSE);
2410         ahd_unlock(ahd, &flags);
2411 }
2412
2413 static void ahd_linux_set_dt(struct scsi_target *starget, int dt)
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_DT_REQ;
2425         unsigned int period = tinfo->goal.period;
2426         unsigned int width = tinfo->goal.width;
2427         unsigned long flags;
2428
2429 #ifdef AHD_DEBUG
2430         if ((ahd_debug & AHD_SHOW_DV) != 0)
2431                 printf("%s: %s DT\n", ahd_name(ahd),
2432                        dt ? "enabling" : "disabling");
2433 #endif
2434         if (dt) {
2435                 ppr_options |= MSG_EXT_PPR_DT_REQ;
2436                 if (!width)
2437                         ahd_linux_set_width(starget, 1);
2438         } else {
2439                 if (period <= 9)
2440                         period = 10; /* If resetting DT, period must be >= 25ns */
2441                 /* IU is invalid without DT set */
2442                 ppr_options &= ~MSG_EXT_PPR_IU_REQ;
2443         }
2444         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2445                             starget->channel + 'A', ROLE_INITIATOR);
2446         ahd_find_syncrate(ahd, &period, &ppr_options,
2447                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2448
2449         ahd_lock(ahd, &flags);
2450         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2451                          ppr_options, AHD_TRANS_GOAL, FALSE);
2452         ahd_unlock(ahd, &flags);
2453 }
2454
2455 static void ahd_linux_set_qas(struct scsi_target *starget, int qas)
2456 {
2457         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2458         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2459         struct ahd_tmode_tstate *tstate;
2460         struct ahd_initiator_tinfo *tinfo
2461                 = ahd_fetch_transinfo(ahd,
2462                                       starget->channel + 'A',
2463                                       shost->this_id, starget->id, &tstate);
2464         struct ahd_devinfo devinfo;
2465         unsigned int ppr_options = tinfo->goal.ppr_options
2466                 & ~MSG_EXT_PPR_QAS_REQ;
2467         unsigned int period = tinfo->goal.period;
2468         unsigned int dt;
2469         unsigned long flags;
2470
2471 #ifdef AHD_DEBUG
2472         if ((ahd_debug & AHD_SHOW_DV) != 0)
2473                 printf("%s: %s QAS\n", ahd_name(ahd),
2474                        qas ? "enabling" : "disabling");
2475 #endif
2476
2477         if (qas) {
2478                 ppr_options |= MSG_EXT_PPR_QAS_REQ;
2479         }
2480
2481         dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2482
2483         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2484                             starget->channel + 'A', ROLE_INITIATOR);
2485         ahd_find_syncrate(ahd, &period, &ppr_options,
2486                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2487
2488         ahd_lock(ahd, &flags);
2489         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2490                          ppr_options, AHD_TRANS_GOAL, FALSE);
2491         ahd_unlock(ahd, &flags);
2492 }
2493
2494 static void ahd_linux_set_iu(struct scsi_target *starget, int iu)
2495 {
2496         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2497         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2498         struct ahd_tmode_tstate *tstate;
2499         struct ahd_initiator_tinfo *tinfo
2500                 = ahd_fetch_transinfo(ahd,
2501                                       starget->channel + 'A',
2502                                       shost->this_id, starget->id, &tstate);
2503         struct ahd_devinfo devinfo;
2504         unsigned int ppr_options = tinfo->goal.ppr_options
2505                 & ~MSG_EXT_PPR_IU_REQ;
2506         unsigned int period = tinfo->goal.period;
2507         unsigned int dt;
2508         unsigned long flags;
2509
2510 #ifdef AHD_DEBUG
2511         if ((ahd_debug & AHD_SHOW_DV) != 0)
2512                 printf("%s: %s IU\n", ahd_name(ahd),
2513                        iu ? "enabling" : "disabling");
2514 #endif
2515
2516         if (iu) {
2517                 ppr_options |= MSG_EXT_PPR_IU_REQ;
2518                 ppr_options |= MSG_EXT_PPR_DT_REQ; /* IU requires DT */
2519         }
2520
2521         dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2522
2523         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2524                             starget->channel + 'A', ROLE_INITIATOR);
2525         ahd_find_syncrate(ahd, &period, &ppr_options,
2526                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2527
2528         ahd_lock(ahd, &flags);
2529         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2530                          ppr_options, AHD_TRANS_GOAL, FALSE);
2531         ahd_unlock(ahd, &flags);
2532 }
2533
2534 static void ahd_linux_set_rd_strm(struct scsi_target *starget, int rdstrm)
2535 {
2536         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2537         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2538         struct ahd_tmode_tstate *tstate;
2539         struct ahd_initiator_tinfo *tinfo
2540                 = ahd_fetch_transinfo(ahd,
2541                                       starget->channel + 'A',
2542                                       shost->this_id, starget->id, &tstate);
2543         struct ahd_devinfo devinfo;
2544         unsigned int ppr_options = tinfo->goal.ppr_options
2545                 & ~MSG_EXT_PPR_RD_STRM;
2546         unsigned int period = tinfo->goal.period;
2547         unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2548         unsigned long flags;
2549
2550 #ifdef AHD_DEBUG
2551         if ((ahd_debug & AHD_SHOW_DV) != 0)
2552                 printf("%s: %s Read Streaming\n", ahd_name(ahd),
2553                        rdstrm  ? "enabling" : "disabling");
2554 #endif
2555
2556         if (rdstrm)
2557                 ppr_options |= MSG_EXT_PPR_RD_STRM;
2558
2559         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2560                             starget->channel + 'A', ROLE_INITIATOR);
2561         ahd_find_syncrate(ahd, &period, &ppr_options,
2562                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2563
2564         ahd_lock(ahd, &flags);
2565         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2566                          ppr_options, AHD_TRANS_GOAL, FALSE);
2567         ahd_unlock(ahd, &flags);
2568 }
2569
2570 static void ahd_linux_set_wr_flow(struct scsi_target *starget, int wrflow)
2571 {
2572         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2573         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2574         struct ahd_tmode_tstate *tstate;
2575         struct ahd_initiator_tinfo *tinfo
2576                 = ahd_fetch_transinfo(ahd,
2577                                       starget->channel + 'A',
2578                                       shost->this_id, starget->id, &tstate);
2579         struct ahd_devinfo devinfo;
2580         unsigned int ppr_options = tinfo->goal.ppr_options
2581                 & ~MSG_EXT_PPR_WR_FLOW;
2582         unsigned int period = tinfo->goal.period;
2583         unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2584         unsigned long flags;
2585
2586 #ifdef AHD_DEBUG
2587         if ((ahd_debug & AHD_SHOW_DV) != 0)
2588                 printf("%s: %s Write Flow Control\n", ahd_name(ahd),
2589                        wrflow ? "enabling" : "disabling");
2590 #endif
2591
2592         if (wrflow)
2593                 ppr_options |= MSG_EXT_PPR_WR_FLOW;
2594
2595         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2596                             starget->channel + 'A', ROLE_INITIATOR);
2597         ahd_find_syncrate(ahd, &period, &ppr_options,
2598                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2599
2600         ahd_lock(ahd, &flags);
2601         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2602                          ppr_options, AHD_TRANS_GOAL, FALSE);
2603         ahd_unlock(ahd, &flags);
2604 }
2605
2606 static void ahd_linux_set_rti(struct scsi_target *starget, int rti)
2607 {
2608         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2609         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2610         struct ahd_tmode_tstate *tstate;
2611         struct ahd_initiator_tinfo *tinfo
2612                 = ahd_fetch_transinfo(ahd,
2613                                       starget->channel + 'A',
2614                                       shost->this_id, starget->id, &tstate);
2615         struct ahd_devinfo devinfo;
2616         unsigned int ppr_options = tinfo->goal.ppr_options
2617                 & ~MSG_EXT_PPR_RTI;
2618         unsigned int period = tinfo->goal.period;
2619         unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2620         unsigned long flags;
2621
2622         if ((ahd->features & AHD_RTI) == 0) {
2623 #ifdef AHD_DEBUG
2624                 if ((ahd_debug & AHD_SHOW_DV) != 0)
2625                         printf("%s: RTI not available\n", ahd_name(ahd));
2626 #endif
2627                 return;
2628         }
2629
2630 #ifdef AHD_DEBUG
2631         if ((ahd_debug & AHD_SHOW_DV) != 0)
2632                 printf("%s: %s RTI\n", ahd_name(ahd),
2633                        rti ? "enabling" : "disabling");
2634 #endif
2635
2636         if (rti)
2637                 ppr_options |= MSG_EXT_PPR_RTI;
2638
2639         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2640                             starget->channel + 'A', ROLE_INITIATOR);
2641         ahd_find_syncrate(ahd, &period, &ppr_options,
2642                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2643
2644         ahd_lock(ahd, &flags);
2645         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2646                          ppr_options, AHD_TRANS_GOAL, FALSE);
2647         ahd_unlock(ahd, &flags);
2648 }
2649
2650 static void ahd_linux_set_pcomp_en(struct scsi_target *starget, int pcomp)
2651 {
2652         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2653         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2654         struct ahd_tmode_tstate *tstate;
2655         struct ahd_initiator_tinfo *tinfo
2656                 = ahd_fetch_transinfo(ahd,
2657                                       starget->channel + 'A',
2658                                       shost->this_id, starget->id, &tstate);
2659         struct ahd_devinfo devinfo;
2660         unsigned int ppr_options = tinfo->goal.ppr_options
2661                 & ~MSG_EXT_PPR_PCOMP_EN;
2662         unsigned int period = tinfo->goal.period;
2663         unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2664         unsigned long flags;
2665
2666 #ifdef AHD_DEBUG
2667         if ((ahd_debug & AHD_SHOW_DV) != 0)
2668                 printf("%s: %s Precompensation\n", ahd_name(ahd),
2669                        pcomp ? "Enable" : "Disable");
2670 #endif
2671
2672         if (pcomp)
2673                 ppr_options |= MSG_EXT_PPR_PCOMP_EN;
2674
2675         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2676                             starget->channel + 'A', ROLE_INITIATOR);
2677         ahd_find_syncrate(ahd, &period, &ppr_options,
2678                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2679
2680         ahd_lock(ahd, &flags);
2681         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2682                          ppr_options, AHD_TRANS_GOAL, FALSE);
2683         ahd_unlock(ahd, &flags);
2684 }
2685
2686 static void ahd_linux_set_hold_mcs(struct scsi_target *starget, int hold)
2687 {
2688         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2689         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2690         struct ahd_tmode_tstate *tstate;
2691         struct ahd_initiator_tinfo *tinfo
2692                 = ahd_fetch_transinfo(ahd,
2693                                       starget->channel + 'A',
2694                                       shost->this_id, starget->id, &tstate);
2695         struct ahd_devinfo devinfo;
2696         unsigned int ppr_options = tinfo->goal.ppr_options
2697                 & ~MSG_EXT_PPR_HOLD_MCS;
2698         unsigned int period = tinfo->goal.period;
2699         unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2700         unsigned long flags;
2701
2702         if (hold)
2703                 ppr_options |= MSG_EXT_PPR_HOLD_MCS;
2704
2705         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2706                             starget->channel + 'A', ROLE_INITIATOR);
2707         ahd_find_syncrate(ahd, &period, &ppr_options,
2708                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2709
2710         ahd_lock(ahd, &flags);
2711         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2712                          ppr_options, AHD_TRANS_GOAL, FALSE);
2713         ahd_unlock(ahd, &flags);
2714 }
2715
2716
2717
2718 static struct spi_function_template ahd_linux_transport_functions = {
2719         .set_offset     = ahd_linux_set_offset,
2720         .show_offset    = 1,
2721         .set_period     = ahd_linux_set_period,
2722         .show_period    = 1,
2723         .set_width      = ahd_linux_set_width,
2724         .show_width     = 1,
2725         .set_dt         = ahd_linux_set_dt,
2726         .show_dt        = 1,
2727         .set_iu         = ahd_linux_set_iu,
2728         .show_iu        = 1,
2729         .set_qas        = ahd_linux_set_qas,
2730         .show_qas       = 1,
2731         .set_rd_strm    = ahd_linux_set_rd_strm,
2732         .show_rd_strm   = 1,
2733         .set_wr_flow    = ahd_linux_set_wr_flow,
2734         .show_wr_flow   = 1,
2735         .set_rti        = ahd_linux_set_rti,
2736         .show_rti       = 1,
2737         .set_pcomp_en   = ahd_linux_set_pcomp_en,
2738         .show_pcomp_en  = 1,
2739         .set_hold_mcs   = ahd_linux_set_hold_mcs,
2740         .show_hold_mcs  = 1,
2741 };
2742
2743 static int __init
2744 ahd_linux_init(void)
2745 {
2746         int     error = 0;
2747
2748         /*
2749          * If we've been passed any parameters, process them now.
2750          */
2751         if (aic79xx)
2752                 aic79xx_setup(aic79xx);
2753
2754         ahd_linux_transport_template =
2755                 spi_attach_transport(&ahd_linux_transport_functions);
2756         if (!ahd_linux_transport_template)
2757                 return -ENODEV;
2758
2759         scsi_transport_reserve_target(ahd_linux_transport_template,
2760                                       sizeof(struct ahd_linux_target));
2761         scsi_transport_reserve_device(ahd_linux_transport_template,
2762                                       sizeof(struct ahd_linux_device));
2763
2764         error = ahd_linux_pci_init();
2765         if (error)
2766                 spi_release_transport(ahd_linux_transport_template);
2767         return error;
2768 }
2769
2770 static void __exit
2771 ahd_linux_exit(void)
2772 {
2773         ahd_linux_pci_exit();
2774         spi_release_transport(ahd_linux_transport_template);
2775 }
2776
2777 module_init(ahd_linux_init);
2778 module_exit(ahd_linux_exit);