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         int rtn = SCSI_MLQUEUE_HOST_BUSY;
 440         unsigned long flags;
 441
 442         ahd = *(struct ahd_softc **)cmd->device->host->hostdata;
 443
 444         ahd_lock(ahd, &flags);
 445         if (ahd->platform_data->qfrozen == 0) {
 446                 cmd->scsi_done = scsi_done;
 447                 cmd->result = CAM_REQ_INPROG << 16;
 448                 rtn = ahd_linux_run_command(ahd, dev, cmd);
 449
 450         }
 451         ahd_unlock(ahd, &flags);
 452         return rtn;
 453 }
 454
 455 static inline struct scsi_target **
 456 ahd_linux_target_in_softc(struct scsi_target *starget)
 457 {
 458         struct  ahd_softc *ahd =
 459                 *((struct ahd_softc **)dev_to_shost(&starget->dev)->hostdata);
 460         unsigned int target_offset;
 461
 462         target_offset = starget->id;
 463         if (starget->channel != 0)
 464                 target_offset += 8;
 465
 466         return &ahd->platform_data->starget[target_offset];
 467 }
 468
 469 static int
 470 ahd_linux_target_alloc(struct scsi_target *starget)
 471 {
 472         struct  ahd_softc *ahd =
 473                 *((struct ahd_softc **)dev_to_shost(&starget->dev)->hostdata);
 474         unsigned long flags;
 475         struct scsi_target **ahd_targp = ahd_linux_target_in_softc(starget);
 476         struct ahd_linux_target *targ = scsi_transport_target_data(starget);
 477         struct ahd_devinfo devinfo;
 478         struct ahd_initiator_tinfo *tinfo;
 479         struct ahd_tmode_tstate *tstate;
 480         char channel = starget->channel + 'A';
 481
 482         ahd_lock(ahd, &flags);
 483
 484         BUG_ON(*ahd_targp != NULL);
 485
 486         *ahd_targp = starget;
 487         memset(targ, 0, sizeof(*targ));
 488
 489         tinfo = ahd_fetch_transinfo(ahd, channel, ahd->our_id,
 490                                     starget->id, &tstate);
 491         ahd_compile_devinfo(&devinfo, ahd->our_id, starget->id,
 492                             CAM_LUN_WILDCARD, channel,
 493                             ROLE_INITIATOR);
 494         spi_min_period(starget) = AHD_SYNCRATE_MAX; /* We can do U320 */
 495         if ((ahd->bugs & AHD_PACED_NEGTABLE_BUG) != 0)
 496                 spi_max_offset(starget) = MAX_OFFSET_PACED_BUG;
 497         else
 498                 spi_max_offset(starget) = MAX_OFFSET_PACED;
 499         spi_max_width(starget) = ahd->features & AHD_WIDE;
 500
 501         ahd_set_syncrate(ahd, &devinfo, 0, 0, 0,
 502                          AHD_TRANS_GOAL, /*paused*/FALSE);
 503         ahd_set_width(ahd, &devinfo, MSG_EXT_WDTR_BUS_8_BIT,
 504                       AHD_TRANS_GOAL, /*paused*/FALSE);
 505         ahd_unlock(ahd, &flags);
 506
 507         return 0;
 508 }
 509
 510 static void
 511 ahd_linux_target_destroy(struct scsi_target *starget)
 512 {
 513         struct scsi_target **ahd_targp = ahd_linux_target_in_softc(starget);
 514
 515         *ahd_targp = NULL;
 516 }
 517
 518 static int
 519 ahd_linux_slave_alloc(struct scsi_device *sdev)
 520 {
 521         struct  ahd_softc *ahd =
 522                 *((struct ahd_softc **)sdev->host->hostdata);
 523         struct scsi_target *starget = sdev->sdev_target;
 524         struct ahd_linux_target *targ = scsi_transport_target_data(starget);
 525         struct ahd_linux_device *dev;
 526
 527         if (bootverbose)
 528                 printf("%s: Slave Alloc %d\n", ahd_name(ahd), sdev->id);
 529
 530         BUG_ON(targ->sdev[sdev->lun] != NULL);
 531
 532         dev = scsi_transport_device_data(sdev);
 533         memset(dev, 0, sizeof(*dev));
 534
 535         /*
 536          * We start out life using untagged
 537          * transactions of which we allow one.
 538          */
 539         dev->openings = 1;
 540
 541         /*
 542          * Set maxtags to 0.  This will be changed if we
 543          * later determine that we are dealing with
 544          * a tagged queuing capable device.
 545          */
 546         dev->maxtags = 0;
 547
 548         targ->sdev[sdev->lun] = sdev;
 549
 550         return (0);
 551 }
 552
 553 static int
 554 ahd_linux_slave_configure(struct scsi_device *sdev)
 555 {
 556         struct  ahd_softc *ahd;
 557
 558         ahd = *((struct ahd_softc **)sdev->host->hostdata);
 559         if (bootverbose)
 560                 sdev_printk(KERN_INFO, sdev, "Slave Configure\n");
 561
 562         ahd_linux_device_queue_depth(sdev);
 563
 564         /* Initial Domain Validation */
 565         if (!spi_initial_dv(sdev->sdev_target))
 566                 spi_dv_device(sdev);
 567
 568         return 0;
 569 }
 570
 571 static void
 572 ahd_linux_slave_destroy(struct scsi_device *sdev)
 573 {
 574         struct  ahd_softc *ahd;
 575         struct  ahd_linux_device *dev = scsi_transport_device_data(sdev);
 576         struct  ahd_linux_target *targ = scsi_transport_target_data(sdev->sdev_target);
 577
 578         ahd = *((struct ahd_softc **)sdev->host->hostdata);
 579         if (bootverbose)
 580                 printf("%s: Slave Destroy %d\n", ahd_name(ahd), sdev->id);
 581
 582         BUG_ON(dev->active);
 583
 584         targ->sdev[sdev->lun] = NULL;
 585
 586 }
 587
 588 #if defined(__i386__)
 589 /*
 590  * Return the disk geometry for the given SCSI device.
 591  */
 592 static int
 593 ahd_linux_biosparam(struct scsi_device *sdev, struct block_device *bdev,
 594                     sector_t capacity, int geom[])
 595 {
 596         uint8_t *bh;
 597         int      heads;
 598         int      sectors;
 599         int      cylinders;
 600         int      ret;
 601         int      extended;
 602         struct   ahd_softc *ahd;
 603
 604         ahd = *((struct ahd_softc **)sdev->host->hostdata);
 605
 606         bh = scsi_bios_ptable(bdev);
 607         if (bh) {
 608                 ret = scsi_partsize(bh, capacity,
 609                                     &geom[2], &geom[0], &geom[1]);
 610                 kfree(bh);
 611                 if (ret != -1)
 612                         return (ret);
 613         }
 614         heads = 64;
 615         sectors = 32;
 616         cylinders = aic_sector_div(capacity, heads, sectors);
 617
 618         if (aic79xx_extended != 0)
 619                 extended = 1;
 620         else
 621                 extended = (ahd->flags & AHD_EXTENDED_TRANS_A) != 0;
 622         if (extended && cylinders >= 1024) {
 623                 heads = 255;
 624                 sectors = 63;
 625                 cylinders = aic_sector_div(capacity, heads, sectors);
 626         }
 627         geom[0] = heads;
 628         geom[1] = sectors;
 629         geom[2] = cylinders;
 630         return (0);
 631 }
 632 #endif
 633
 634 /*
 635  * Abort the current SCSI command(s).
 636  */
 637 static int
 638 ahd_linux_abort(struct scsi_cmnd *cmd)
 639 {
 640         int error;
 641
 642         error = ahd_linux_queue_recovery_cmd(cmd, SCB_ABORT);
 643         if (error != 0)
 644                 printf("aic79xx_abort returns 0x%x\n", error);
 645         return error;
 646 }
 647
 648 /*
 649  * Attempt to send a target reset message to the device that timed out.
 650  */
 651 static int
 652 ahd_linux_dev_reset(struct scsi_cmnd *cmd)
 653 {
 654         int error;
 655
 656         error = ahd_linux_queue_recovery_cmd(cmd, SCB_DEVICE_RESET);
 657         if (error != 0)
 658                 printf("aic79xx_dev_reset returns 0x%x\n", error);
 659         return error;
 660 }
 661
 662 /*
 663  * Reset the SCSI bus.
 664  */
 665 static int
 666 ahd_linux_bus_reset(struct scsi_cmnd *cmd)
 667 {
 668         struct ahd_softc *ahd;
 669         u_long s;
 670         int    found;
 671
 672         ahd = *(struct ahd_softc **)cmd->device->host->hostdata;
 673 #ifdef AHD_DEBUG
 674         if ((ahd_debug & AHD_SHOW_RECOVERY) != 0)
 675                 printf("%s: Bus reset called for cmd %p\n",
 676                        ahd_name(ahd), cmd);
 677 #endif
 678         ahd_lock(ahd, &s);
 679         found = ahd_reset_channel(ahd, scmd_channel(cmd) + 'A',
 680                                   /*initiate reset*/TRUE);
 681         ahd_unlock(ahd, &s);
 682
 683         if (bootverbose)
 684                 printf("%s: SCSI bus reset delivered. "
 685                        "%d SCBs aborted.\n", ahd_name(ahd), found);
 686
 687         return (SUCCESS);
 688 }
 689
 690 struct scsi_host_template aic79xx_driver_template = {
 691         .module                 = THIS_MODULE,
 692         .name                   = "aic79xx",
 693         .proc_name              = "aic79xx",
 694         .proc_info              = ahd_linux_proc_info,
 695         .info                   = ahd_linux_info,
 696         .queuecommand           = ahd_linux_queue,
 697         .eh_abort_handler       = ahd_linux_abort,
 698         .eh_device_reset_handler = ahd_linux_dev_reset,
 699         .eh_bus_reset_handler   = ahd_linux_bus_reset,
 700 #if defined(__i386__)
 701         .bios_param             = ahd_linux_biosparam,
 702 #endif
 703         .can_queue              = AHD_MAX_QUEUE,
 704         .this_id                = -1,
 705         .cmd_per_lun            = 2,
 706         .use_clustering         = ENABLE_CLUSTERING,
 707         .slave_alloc            = ahd_linux_slave_alloc,
 708         .slave_configure        = ahd_linux_slave_configure,
 709         .slave_destroy          = ahd_linux_slave_destroy,
 710         .target_alloc           = ahd_linux_target_alloc,
 711         .target_destroy         = ahd_linux_target_destroy,
 712 };
 713
 714 /******************************** Bus DMA *************************************/
 715 int
 716 ahd_dma_tag_create(struct ahd_softc *ahd, bus_dma_tag_t parent,
 717                    bus_size_t alignment, bus_size_t boundary,
 718                    dma_addr_t lowaddr, dma_addr_t highaddr,
 719                    bus_dma_filter_t *filter, void *filterarg,
 720                    bus_size_t maxsize, int nsegments,
 721                    bus_size_t maxsegsz, int flags, bus_dma_tag_t *ret_tag)
 722 {
 723         bus_dma_tag_t dmat;
 724
 725         dmat = malloc(sizeof(*dmat), M_DEVBUF, M_NOWAIT);
 726         if (dmat == NULL)
 727                 return (ENOMEM);
 728
 729         /*
 730          * Linux is very simplistic about DMA memory.  For now don't
 731          * maintain all specification information.  Once Linux supplies
 732          * better facilities for doing these operations, or the
 733          * needs of this particular driver change, we might need to do
 734          * more here.
 735          */
 736         dmat->alignment = alignment;
 737         dmat->boundary = boundary;
 738         dmat->maxsize = maxsize;
 739         *ret_tag = dmat;
 740         return (0);
 741 }
 742
 743 void
 744 ahd_dma_tag_destroy(struct ahd_softc *ahd, bus_dma_tag_t dmat)
 745 {
 746         free(dmat, M_DEVBUF);
 747 }
 748
 749 int
 750 ahd_dmamem_alloc(struct ahd_softc *ahd, bus_dma_tag_t dmat, void** vaddr,
 751                  int flags, bus_dmamap_t *mapp)
 752 {
 753         *vaddr = pci_alloc_consistent(ahd->dev_softc,
 754                                       dmat->maxsize, mapp);
 755         if (*vaddr == NULL)
 756                 return (ENOMEM);
 757         return(0);
 758 }
 759
 760 void
 761 ahd_dmamem_free(struct ahd_softc *ahd, bus_dma_tag_t dmat,
 762                 void* vaddr, bus_dmamap_t map)
 763 {
 764         pci_free_consistent(ahd->dev_softc, dmat->maxsize,
 765                             vaddr, map);
 766 }
 767
 768 int
 769 ahd_dmamap_load(struct ahd_softc *ahd, bus_dma_tag_t dmat, bus_dmamap_t map,
 770                 void *buf, bus_size_t buflen, bus_dmamap_callback_t *cb,
 771                 void *cb_arg, int flags)
 772 {
 773         /*
 774          * Assume for now that this will only be used during
 775          * initialization and not for per-transaction buffer mapping.
 776          */
 777         bus_dma_segment_t stack_sg;
 778
 779         stack_sg.ds_addr = map;
 780         stack_sg.ds_len = dmat->maxsize;
 781         cb(cb_arg, &stack_sg, /*nseg*/1, /*error*/0);
 782         return (0);
 783 }
 784
 785 void
 786 ahd_dmamap_destroy(struct ahd_softc *ahd, bus_dma_tag_t dmat, bus_dmamap_t map)
 787 {
 788 }
 789
 790 int
 791 ahd_dmamap_unload(struct ahd_softc *ahd, bus_dma_tag_t dmat, bus_dmamap_t map)
 792 {
 793         /* Nothing to do */
 794         return (0);
 795 }
 796
 797 /********************* Platform Dependent Functions ***************************/
 798 /*
 799  * Compare "left hand" softc with "right hand" softc, returning:
 800  * < 0 - lahd has a lower priority than rahd
 801  *   0 - Softcs are equal
 802  * > 0 - lahd has a higher priority than rahd
 803  */
 804 int
 805 ahd_softc_comp(struct ahd_softc *lahd, struct ahd_softc *rahd)
 806 {
 807         int     value;
 808
 809         /*
 810          * Under Linux, cards are ordered as follows:
 811          *      1) PCI devices that are marked as the boot controller.
 812          *      2) PCI devices with BIOS enabled sorted by bus/slot/func.
 813          *      3) All remaining PCI devices sorted by bus/slot/func.
 814          */
 815 #if 0
 816         value = (lahd->flags & AHD_BOOT_CHANNEL)
 817               - (rahd->flags & AHD_BOOT_CHANNEL);
 818         if (value != 0)
 819                 /* Controllers set for boot have a *higher* priority */
 820                 return (value);
 821 #endif
 822
 823         value = (lahd->flags & AHD_BIOS_ENABLED)
 824               - (rahd->flags & AHD_BIOS_ENABLED);
 825         if (value != 0)
 826                 /* Controllers with BIOS enabled have a *higher* priority */
 827                 return (value);
 828
 829         /* Still equal.  Sort by bus/slot/func. */
 830         if (aic79xx_reverse_scan != 0)
 831                 value = ahd_get_pci_bus(lahd->dev_softc)
 832                       - ahd_get_pci_bus(rahd->dev_softc);
 833         else
 834                 value = ahd_get_pci_bus(rahd->dev_softc)
 835                       - ahd_get_pci_bus(lahd->dev_softc);
 836         if (value != 0)
 837                 return (value);
 838         if (aic79xx_reverse_scan != 0)
 839                 value = ahd_get_pci_slot(lahd->dev_softc)
 840                       - ahd_get_pci_slot(rahd->dev_softc);
 841         else
 842                 value = ahd_get_pci_slot(rahd->dev_softc)
 843                       - ahd_get_pci_slot(lahd->dev_softc);
 844         if (value != 0)
 845                 return (value);
 846
 847         value = rahd->channel - lahd->channel;
 848         return (value);
 849 }
 850
 851 static void
 852 ahd_linux_setup_iocell_info(u_long index, int instance, int targ, int32_t value)
 853 {
 854
 855         if ((instance >= 0)
 856          && (instance < NUM_ELEMENTS(aic79xx_iocell_info))) {
 857                 uint8_t *iocell_info;
 858
 859                 iocell_info = (uint8_t*)&aic79xx_iocell_info[instance];
 860                 iocell_info[index] = value & 0xFFFF;
 861                 if (bootverbose)
 862                         printf("iocell[%d:%ld] = %d\n", instance, index, value);
 863         }
 864 }
 865
 866 static void
 867 ahd_linux_setup_tag_info_global(char *p)
 868 {
 869         int tags, i, j;
 870
 871         tags = simple_strtoul(p + 1, NULL, 0) & 0xff;
 872         printf("Setting Global Tags= %d\n", tags);
 873
 874         for (i = 0; i < NUM_ELEMENTS(aic79xx_tag_info); i++) {
 875                 for (j = 0; j < AHD_NUM_TARGETS; j++) {
 876                         aic79xx_tag_info[i].tag_commands[j] = tags;
 877                 }
 878         }
 879 }
 880
 881 static void
 882 ahd_linux_setup_tag_info(u_long arg, int instance, int targ, int32_t value)
 883 {
 884
 885         if ((instance >= 0) && (targ >= 0)
 886          && (instance < NUM_ELEMENTS(aic79xx_tag_info))
 887          && (targ < AHD_NUM_TARGETS)) {
 888                 aic79xx_tag_info[instance].tag_commands[targ] = value & 0x1FF;
 889                 if (bootverbose)
 890                         printf("tag_info[%d:%d] = %d\n", instance, targ, value);
 891         }
 892 }
 893
 894 static char *
 895 ahd_parse_brace_option(char *opt_name, char *opt_arg, char *end, int depth,
 896                        void (*callback)(u_long, int, int, int32_t),
 897                        u_long callback_arg)
 898 {
 899         char    *tok_end;
 900         char    *tok_end2;
 901         int      i;
 902         int      instance;
 903         int      targ;
 904         int      done;
 905         char     tok_list[] = {'.', ',', '{', '}', '\0'};
 906
 907         /* All options use a ':' name/arg separator */
 908         if (*opt_arg != ':')
 909                 return (opt_arg);
 910         opt_arg++;
 911         instance = -1;
 912         targ = -1;
 913         done = FALSE;
 914         /*
 915          * Restore separator that may be in
 916          * the middle of our option argument.
 917          */
 918         tok_end = strchr(opt_arg, '\0');
 919         if (tok_end < end)
 920                 *tok_end = ',';
 921         while (!done) {
 922                 switch (*opt_arg) {
 923                 case '{':
 924                         if (instance == -1) {
 925                                 instance = 0;
 926                         } else {
 927                                 if (depth > 1) {
 928                                         if (targ == -1)
 929                                                 targ = 0;
 930                                 } else {
 931                                         printf("Malformed Option %s\n",
 932                                                opt_name);
 933                                         done = TRUE;
 934                                 }
 935                         }
 936                         opt_arg++;
 937                         break;
 938                 case '}':
 939                         if (targ != -1)
 940                                 targ = -1;
 941                         else if (instance != -1)
 942                                 instance = -1;
 943                         opt_arg++;
 944                         break;
 945                 case ',':
 946                 case '.':
 947                         if (instance == -1)
 948                                 done = TRUE;
 949                         else if (targ >= 0)
 950                                 targ++;
 951                         else if (instance >= 0)
 952                                 instance++;
 953                         opt_arg++;
 954                         break;
 955                 case '\0':
 956                         done = TRUE;
 957                         break;
 958                 default:
 959                         tok_end = end;
 960                         for (i = 0; tok_list[i]; i++) {
 961                                 tok_end2 = strchr(opt_arg, tok_list[i]);
 962                                 if ((tok_end2) && (tok_end2 < tok_end))
 963                                         tok_end = tok_end2;
 964                         }
 965                         callback(callback_arg, instance, targ,
 966                                  simple_strtol(opt_arg, NULL, 0));
 967                         opt_arg = tok_end;
 968                         break;
 969                 }
 970         }
 971         return (opt_arg);
 972 }
 973
 974 /*
 975  * Handle Linux boot parameters. This routine allows for assigning a value
 976  * to a parameter with a ':' between the parameter and the value.
 977  * ie. aic79xx=stpwlev:1,extended
 978  */
 979 static int
 980 aic79xx_setup(char *s)
 981 {
 982         int     i, n;
 983         char   *p;
 984         char   *end;
 985
 986         static struct {
 987                 const char *name;
 988                 uint32_t *flag;
 989         } options[] = {
 990                 { "extended", &aic79xx_extended },
 991                 { "no_reset", &aic79xx_no_reset },
 992                 { "verbose", &aic79xx_verbose },
 993                 { "allow_memio", &aic79xx_allow_memio},
 994 #ifdef AHD_DEBUG
 995                 { "debug", &ahd_debug },
 996 #endif
 997                 { "reverse_scan", &aic79xx_reverse_scan },
 998                 { "periodic_otag", &aic79xx_periodic_otag },
 999                 { "pci_parity", &aic79xx_pci_parity },
1000                 { "seltime", &aic79xx_seltime },
1001                 { "tag_info", NULL },
1002                 { "global_tag_depth", NULL},
1003                 { "slewrate", NULL },
1004                 { "precomp", NULL },
1005                 { "amplitude", NULL },
1006         };
1007
1008         end = strchr(s, '\0');
1009
1010         /*
1011          * XXX ia64 gcc isn't smart enough to know that NUM_ELEMENTS
1012          * will never be 0 in this case.
1013          */
1014         n = 0;
1015
1016         while ((p = strsep(&s, ",.")) != NULL) {
1017                 if (*p == '\0')
1018                         continue;
1019                 for (i = 0; i < NUM_ELEMENTS(options); i++) {
1020
1021                         n = strlen(options[i].name);
1022                         if (strncmp(options[i].name, p, n) == 0)
1023                                 break;
1024                 }
1025                 if (i == NUM_ELEMENTS(options))
1026                         continue;
1027
1028                 if (strncmp(p, "global_tag_depth", n) == 0) {
1029                         ahd_linux_setup_tag_info_global(p + n);
1030                 } else if (strncmp(p, "tag_info", n) == 0) {
1031                         s = ahd_parse_brace_option("tag_info", p + n, end,
1032                             2, ahd_linux_setup_tag_info, 0);
1033                 } else if (strncmp(p, "slewrate", n) == 0) {
1034                         s = ahd_parse_brace_option("slewrate",
1035                             p + n, end, 1, ahd_linux_setup_iocell_info,
1036                             AIC79XX_SLEWRATE_INDEX);
1037                 } else if (strncmp(p, "precomp", n) == 0) {
1038                         s = ahd_parse_brace_option("precomp",
1039                             p + n, end, 1, ahd_linux_setup_iocell_info,
1040                             AIC79XX_PRECOMP_INDEX);
1041                 } else if (strncmp(p, "amplitude", n) == 0) {
1042                         s = ahd_parse_brace_option("amplitude",
1043                             p + n, end, 1, ahd_linux_setup_iocell_info,
1044                             AIC79XX_AMPLITUDE_INDEX);
1045                 } else if (p[n] == ':') {
1046                         *(options[i].flag) = simple_strtoul(p + n + 1, NULL, 0);
1047                 } else if (!strncmp(p, "verbose", n)) {
1048                         *(options[i].flag) = 1;
1049                 } else {
1050                         *(options[i].flag) ^= 0xFFFFFFFF;
1051                 }
1052         }
1053         return 1;
1054 }
1055
1056 __setup("aic79xx=", aic79xx_setup);
1057
1058 uint32_t aic79xx_verbose;
1059
1060 int
1061 ahd_linux_register_host(struct ahd_softc *ahd, struct scsi_host_template *template)
1062 {
1063         char    buf[80];
1064         struct  Scsi_Host *host;
1065         char    *new_name;
1066         u_long  s;
1067         int     retval;
1068
1069         template->name = ahd->description;
1070         host = scsi_host_alloc(template, sizeof(struct ahd_softc *));
1071         if (host == NULL)
1072                 return (ENOMEM);
1073
1074         *((struct ahd_softc **)host->hostdata) = ahd;
1075         ahd_lock(ahd, &s);
1076         ahd->platform_data->host = host;
1077         host->can_queue = AHD_MAX_QUEUE;
1078         host->cmd_per_lun = 2;
1079         host->sg_tablesize = AHD_NSEG;
1080         host->this_id = ahd->our_id;
1081         host->irq = ahd->platform_data->irq;
1082         host->max_id = (ahd->features & AHD_WIDE) ? 16 : 8;
1083         host->max_lun = AHD_NUM_LUNS;
1084         host->max_channel = 0;
1085         host->sg_tablesize = AHD_NSEG;
1086         ahd_set_unit(ahd, ahd_linux_unit++);
1087         sprintf(buf, "scsi%d", host->host_no);
1088         new_name = malloc(strlen(buf) + 1, M_DEVBUF, M_NOWAIT);
1089         if (new_name != NULL) {
1090                 strcpy(new_name, buf);
1091                 ahd_set_name(ahd, new_name);
1092         }
1093         host->unique_id = ahd->unit;
1094         ahd_linux_initialize_scsi_bus(ahd);
1095         ahd_intr_enable(ahd, TRUE);
1096         ahd_unlock(ahd, &s);
1097
1098         host->transportt = ahd_linux_transport_template;
1099
1100         retval = scsi_add_host(host, &ahd->dev_softc->dev);
1101         if (retval) {
1102                 printk(KERN_WARNING "aic79xx: scsi_add_host failed\n");
1103                 scsi_host_put(host);
1104                 return retval;
1105         }
1106
1107         scsi_scan_host(host);
1108         return 0;
1109 }
1110
1111 uint64_t
1112 ahd_linux_get_memsize(void)
1113 {
1114         struct sysinfo si;
1115
1116         si_meminfo(&si);
1117         return ((uint64_t)si.totalram << PAGE_SHIFT);
1118 }
1119
1120 /*
1121  * Place the SCSI bus into a known state by either resetting it,
1122  * or forcing transfer negotiations on the next command to any
1123  * target.
1124  */
1125 static void
1126 ahd_linux_initialize_scsi_bus(struct ahd_softc *ahd)
1127 {
1128         u_int target_id;
1129         u_int numtarg;
1130
1131         target_id = 0;
1132         numtarg = 0;
1133
1134         if (aic79xx_no_reset != 0)
1135                 ahd->flags &= ~AHD_RESET_BUS_A;
1136
1137         if ((ahd->flags & AHD_RESET_BUS_A) != 0)
1138                 ahd_reset_channel(ahd, 'A', /*initiate_reset*/TRUE);
1139         else
1140                 numtarg = (ahd->features & AHD_WIDE) ? 16 : 8;
1141
1142         /*
1143          * Force negotiation to async for all targets that
1144          * will not see an initial bus reset.
1145          */
1146         for (; target_id < numtarg; target_id++) {
1147                 struct ahd_devinfo devinfo;
1148                 struct ahd_initiator_tinfo *tinfo;
1149                 struct ahd_tmode_tstate *tstate;
1150
1151                 tinfo = ahd_fetch_transinfo(ahd, 'A', ahd->our_id,
1152                                             target_id, &tstate);
1153                 ahd_compile_devinfo(&devinfo, ahd->our_id, target_id,
1154                                     CAM_LUN_WILDCARD, 'A', ROLE_INITIATOR);
1155                 ahd_update_neg_request(ahd, &devinfo, tstate,
1156                                        tinfo, AHD_NEG_ALWAYS);
1157         }
1158         /* Give the bus some time to recover */
1159         if ((ahd->flags & AHD_RESET_BUS_A) != 0) {
1160                 ahd_freeze_simq(ahd);
1161                 init_timer(&ahd->platform_data->reset_timer);
1162                 ahd->platform_data->reset_timer.data = (u_long)ahd;
1163                 ahd->platform_data->reset_timer.expires =
1164                     jiffies + (AIC79XX_RESET_DELAY * HZ)/1000;
1165                 ahd->platform_data->reset_timer.function =
1166                     (ahd_linux_callback_t *)ahd_release_simq;
1167                 add_timer(&ahd->platform_data->reset_timer);
1168         }
1169 }
1170
1171 int
1172 ahd_platform_alloc(struct ahd_softc *ahd, void *platform_arg)
1173 {
1174         ahd->platform_data =
1175             malloc(sizeof(struct ahd_platform_data), M_DEVBUF, M_NOWAIT);
1176         if (ahd->platform_data == NULL)
1177                 return (ENOMEM);
1178         memset(ahd->platform_data, 0, sizeof(struct ahd_platform_data));
1179         ahd->platform_data->irq = AHD_LINUX_NOIRQ;
1180         ahd_lockinit(ahd);
1181         init_MUTEX_LOCKED(&ahd->platform_data->eh_sem);
1182         ahd->seltime = (aic79xx_seltime & 0x3) << 4;
1183         return (0);
1184 }
1185
1186 void
1187 ahd_platform_free(struct ahd_softc *ahd)
1188 {
1189         struct scsi_target *starget;
1190         int i, j;
1191
1192         if (ahd->platform_data != NULL) {
1193                 /* destroy all of the device and target objects */
1194                 for (i = 0; i < AHD_NUM_TARGETS; i++) {
1195                         starget = ahd->platform_data->starget[i];
1196                         if (starget != NULL) {
1197                                 for (j = 0; j < AHD_NUM_LUNS; j++) {
1198                                         struct ahd_linux_target *targ =
1199                                                 scsi_transport_target_data(starget);
1200                                         if (targ->sdev[j] == NULL)
1201                                                 continue;
1202                                         targ->sdev[j] = NULL;
1203                                 }
1204                                 ahd->platform_data->starget[i] = NULL;
1205                         }
1206                 }
1207
1208                 if (ahd->platform_data->irq != AHD_LINUX_NOIRQ)
1209                         free_irq(ahd->platform_data->irq, ahd);
1210                 if (ahd->tags[0] == BUS_SPACE_PIO
1211                  && ahd->bshs[0].ioport != 0)
1212                         release_region(ahd->bshs[0].ioport, 256);
1213                 if (ahd->tags[1] == BUS_SPACE_PIO
1214                  && ahd->bshs[1].ioport != 0)
1215                         release_region(ahd->bshs[1].ioport, 256);
1216                 if (ahd->tags[0] == BUS_SPACE_MEMIO
1217                  && ahd->bshs[0].maddr != NULL) {
1218                         iounmap(ahd->bshs[0].maddr);
1219                         release_mem_region(ahd->platform_data->mem_busaddr,
1220                                            0x1000);
1221                 }
1222                 if (ahd->platform_data->host)
1223                         scsi_host_put(ahd->platform_data->host);
1224
1225                 free(ahd->platform_data, M_DEVBUF);
1226         }
1227 }
1228
1229 void
1230 ahd_platform_init(struct ahd_softc *ahd)
1231 {
1232         /*
1233          * Lookup and commit any modified IO Cell options.
1234          */
1235         if (ahd->unit < NUM_ELEMENTS(aic79xx_iocell_info)) {
1236                 struct ahd_linux_iocell_opts *iocell_opts;
1237
1238                 iocell_opts = &aic79xx_iocell_info[ahd->unit];
1239                 if (iocell_opts->precomp != AIC79XX_DEFAULT_PRECOMP)
1240                         AHD_SET_PRECOMP(ahd, iocell_opts->precomp);
1241                 if (iocell_opts->slewrate != AIC79XX_DEFAULT_SLEWRATE)
1242                         AHD_SET_SLEWRATE(ahd, iocell_opts->slewrate);
1243                 if (iocell_opts->amplitude != AIC79XX_DEFAULT_AMPLITUDE)
1244                         AHD_SET_AMPLITUDE(ahd, iocell_opts->amplitude);
1245         }
1246
1247 }
1248
1249 void
1250 ahd_platform_freeze_devq(struct ahd_softc *ahd, struct scb *scb)
1251 {
1252         ahd_platform_abort_scbs(ahd, SCB_GET_TARGET(ahd, scb),
1253                                 SCB_GET_CHANNEL(ahd, scb),
1254                                 SCB_GET_LUN(scb), SCB_LIST_NULL,
1255                                 ROLE_UNKNOWN, CAM_REQUEUE_REQ);
1256 }
1257
1258 void
1259 ahd_platform_set_tags(struct ahd_softc *ahd, struct ahd_devinfo *devinfo,
1260                       ahd_queue_alg alg)
1261 {
1262         struct scsi_target *starget;
1263         struct ahd_linux_target *targ;
1264         struct ahd_linux_device *dev;
1265         struct scsi_device *sdev;
1266         int was_queuing;
1267         int now_queuing;
1268
1269         starget = ahd->platform_data->starget[devinfo->target];
1270         targ = scsi_transport_target_data(starget);
1271         BUG_ON(targ == NULL);
1272         sdev = targ->sdev[devinfo->lun];
1273         if (sdev == NULL)
1274                 return;
1275
1276         dev = scsi_transport_device_data(sdev);
1277
1278         if (dev == NULL)
1279                 return;
1280         was_queuing = dev->flags & (AHD_DEV_Q_BASIC|AHD_DEV_Q_TAGGED);
1281         switch (alg) {
1282         default:
1283         case AHD_QUEUE_NONE:
1284                 now_queuing = 0;
1285                 break;
1286         case AHD_QUEUE_BASIC:
1287                 now_queuing = AHD_DEV_Q_BASIC;
1288                 break;
1289         case AHD_QUEUE_TAGGED:
1290                 now_queuing = AHD_DEV_Q_TAGGED;
1291                 break;
1292         }
1293         if ((dev->flags & AHD_DEV_FREEZE_TIL_EMPTY) == 0
1294          && (was_queuing != now_queuing)
1295          && (dev->active != 0)) {
1296                 dev->flags |= AHD_DEV_FREEZE_TIL_EMPTY;
1297                 dev->qfrozen++;
1298         }
1299
1300         dev->flags &= ~(AHD_DEV_Q_BASIC|AHD_DEV_Q_TAGGED|AHD_DEV_PERIODIC_OTAG);
1301         if (now_queuing) {
1302                 u_int usertags;
1303
1304                 usertags = ahd_linux_user_tagdepth(ahd, devinfo);
1305                 if (!was_queuing) {
1306                         /*
1307                          * Start out agressively and allow our
1308                          * dynamic queue depth algorithm to take
1309                          * care of the rest.
1310                          */
1311                         dev->maxtags = usertags;
1312                         dev->openings = dev->maxtags - dev->active;
1313                 }
1314                 if (dev->maxtags == 0) {
1315                         /*
1316                          * Queueing is disabled by the user.
1317                          */
1318                         dev->openings = 1;
1319                 } else if (alg == AHD_QUEUE_TAGGED) {
1320                         dev->flags |= AHD_DEV_Q_TAGGED;
1321                         if (aic79xx_periodic_otag != 0)
1322                                 dev->flags |= AHD_DEV_PERIODIC_OTAG;
1323                 } else
1324                         dev->flags |= AHD_DEV_Q_BASIC;
1325         } else {
1326                 /* We can only have one opening. */
1327                 dev->maxtags = 0;
1328                 dev->openings =  1 - dev->active;
1329         }
1330
1331         switch ((dev->flags & (AHD_DEV_Q_BASIC|AHD_DEV_Q_TAGGED))) {
1332         case AHD_DEV_Q_BASIC:
1333                 scsi_adjust_queue_depth(sdev,
1334                                         MSG_SIMPLE_TASK,
1335                                         dev->openings + dev->active);
1336                 break;
1337         case AHD_DEV_Q_TAGGED:
1338                 scsi_adjust_queue_depth(sdev,
1339                                         MSG_ORDERED_TASK,
1340                                         dev->openings + dev->active);
1341                 break;
1342         default:
1343                 /*
1344                  * We allow the OS to queue 2 untagged transactions to
1345                  * us at any time even though we can only execute them
1346                  * serially on the controller/device.  This should
1347                  * remove some latency.
1348                  */
1349                 scsi_adjust_queue_depth(sdev,
1350                                         /*NON-TAGGED*/0,
1351                                         /*queue depth*/2);
1352                 break;
1353         }
1354 }
1355
1356 int
1357 ahd_platform_abort_scbs(struct ahd_softc *ahd, int target, char channel,
1358                         int lun, u_int tag, role_t role, uint32_t status)
1359 {
1360         return 0;
1361 }
1362
1363 static u_int
1364 ahd_linux_user_tagdepth(struct ahd_softc *ahd, struct ahd_devinfo *devinfo)
1365 {
1366         static int warned_user;
1367         u_int tags;
1368
1369         tags = 0;
1370         if ((ahd->user_discenable & devinfo->target_mask) != 0) {
1371                 if (ahd->unit >= NUM_ELEMENTS(aic79xx_tag_info)) {
1372
1373                         if (warned_user == 0) {
1374                                 printf(KERN_WARNING
1375 "aic79xx: WARNING: Insufficient tag_info instances\n"
1376 "aic79xx: for installed controllers.  Using defaults\n"
1377 "aic79xx: Please update the aic79xx_tag_info array in\n"
1378 "aic79xx: the aic79xx_osm.c source file.\n");
1379                                 warned_user++;
1380                         }
1381                         tags = AHD_MAX_QUEUE;
1382                 } else {
1383                         adapter_tag_info_t *tag_info;
1384
1385                         tag_info = &aic79xx_tag_info[ahd->unit];
1386                         tags = tag_info->tag_commands[devinfo->target_offset];
1387                         if (tags > AHD_MAX_QUEUE)
1388                                 tags = AHD_MAX_QUEUE;
1389                 }
1390         }
1391         return (tags);
1392 }
1393
1394 /*
1395  * Determines the queue depth for a given device.
1396  */
1397 static void
1398 ahd_linux_device_queue_depth(struct scsi_device *sdev)
1399 {
1400         struct  ahd_devinfo devinfo;
1401         u_int   tags;
1402         struct ahd_softc *ahd = *((struct ahd_softc **)sdev->host->hostdata);
1403
1404         ahd_compile_devinfo(&devinfo,
1405                             ahd->our_id,
1406                             sdev->sdev_target->id, sdev->lun,
1407                             sdev->sdev_target->channel == 0 ? 'A' : 'B',
1408                             ROLE_INITIATOR);
1409         tags = ahd_linux_user_tagdepth(ahd, &devinfo);
1410         if (tags != 0 && sdev->tagged_supported != 0) {
1411
1412                 ahd_set_tags(ahd, &devinfo, AHD_QUEUE_TAGGED);
1413                 ahd_print_devinfo(ahd, &devinfo);
1414                 printf("Tagged Queuing enabled.  Depth %d\n", tags);
1415         } else {
1416                 ahd_set_tags(ahd, &devinfo, AHD_QUEUE_NONE);
1417         }
1418 }
1419
1420 static int
1421 ahd_linux_run_command(struct ahd_softc *ahd, struct ahd_linux_device *dev,
1422                       struct scsi_cmnd *cmd)
1423 {
1424         struct   scb *scb;
1425         struct   hardware_scb *hscb;
1426         struct   ahd_initiator_tinfo *tinfo;
1427         struct   ahd_tmode_tstate *tstate;
1428         u_int    col_idx;
1429         uint16_t mask;
1430
1431         /*
1432          * Get an scb to use.
1433          */
1434         tinfo = ahd_fetch_transinfo(ahd, 'A', ahd->our_id,
1435                                     cmd->device->id, &tstate);
1436         if ((dev->flags & (AHD_DEV_Q_TAGGED|AHD_DEV_Q_BASIC)) == 0
1437          || (tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ) != 0) {
1438                 col_idx = AHD_NEVER_COL_IDX;
1439         } else {
1440                 col_idx = AHD_BUILD_COL_IDX(cmd->device->id,
1441                                             cmd->device->lun);
1442         }
1443         if ((scb = ahd_get_scb(ahd, col_idx)) == NULL) {
1444                 ahd->flags |= AHD_RESOURCE_SHORTAGE;
1445                 return SCSI_MLQUEUE_HOST_BUSY;
1446         }
1447
1448         scb->io_ctx = cmd;
1449         scb->platform_data->dev = dev;
1450         hscb = scb->hscb;
1451         cmd->host_scribble = (char *)scb;
1452
1453         /*
1454          * Fill out basics of the HSCB.
1455          */
1456         hscb->control = 0;
1457         hscb->scsiid = BUILD_SCSIID(ahd, cmd);
1458         hscb->lun = cmd->device->lun;
1459         scb->hscb->task_management = 0;
1460         mask = SCB_GET_TARGET_MASK(ahd, scb);
1461
1462         if ((ahd->user_discenable & mask) != 0)
1463                 hscb->control |= DISCENB;
1464
1465         if ((tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ) != 0)
1466                 scb->flags |= SCB_PACKETIZED;
1467
1468         if ((tstate->auto_negotiate & mask) != 0) {
1469                 scb->flags |= SCB_AUTO_NEGOTIATE;
1470                 scb->hscb->control |= MK_MESSAGE;
1471         }
1472
1473         if ((dev->flags & (AHD_DEV_Q_TAGGED|AHD_DEV_Q_BASIC)) != 0) {
1474                 int     msg_bytes;
1475                 uint8_t tag_msgs[2];
1476
1477                 msg_bytes = scsi_populate_tag_msg(cmd, tag_msgs);
1478                 if (msg_bytes && tag_msgs[0] != MSG_SIMPLE_TASK) {
1479                         hscb->control |= tag_msgs[0];
1480                         if (tag_msgs[0] == MSG_ORDERED_TASK)
1481                                 dev->commands_since_idle_or_otag = 0;
1482                 } else
1483                 if (dev->commands_since_idle_or_otag == AHD_OTAG_THRESH
1484                  && (dev->flags & AHD_DEV_Q_TAGGED) != 0) {
1485                         hscb->control |= MSG_ORDERED_TASK;
1486                         dev->commands_since_idle_or_otag = 0;
1487                 } else {
1488                         hscb->control |= MSG_SIMPLE_TASK;
1489                 }
1490         }
1491
1492         hscb->cdb_len = cmd->cmd_len;
1493         memcpy(hscb->shared_data.idata.cdb, cmd->cmnd, hscb->cdb_len);
1494
1495         scb->platform_data->xfer_len = 0;
1496         ahd_set_residual(scb, 0);
1497         ahd_set_sense_residual(scb, 0);
1498         scb->sg_count = 0;
1499         if (cmd->use_sg != 0) {
1500                 void    *sg;
1501                 struct   scatterlist *cur_seg;
1502                 u_int    nseg;
1503                 int      dir;
1504
1505                 cur_seg = (struct scatterlist *)cmd->request_buffer;
1506                 dir = cmd->sc_data_direction;
1507                 nseg = pci_map_sg(ahd->dev_softc, cur_seg,
1508                                   cmd->use_sg, dir);
1509                 scb->platform_data->xfer_len = 0;
1510                 for (sg = scb->sg_list; nseg > 0; nseg--, cur_seg++) {
1511                         dma_addr_t addr;
1512                         bus_size_t len;
1513
1514                         addr = sg_dma_address(cur_seg);
1515                         len = sg_dma_len(cur_seg);
1516                         scb->platform_data->xfer_len += len;
1517                         sg = ahd_sg_setup(ahd, scb, sg, addr, len,
1518                                           /*last*/nseg == 1);
1519                 }
1520         } else if (cmd->request_bufflen != 0) {
1521                 void *sg;
1522                 dma_addr_t addr;
1523                 int dir;
1524
1525                 sg = scb->sg_list;
1526                 dir = cmd->sc_data_direction;
1527                 addr = pci_map_single(ahd->dev_softc,
1528                                       cmd->request_buffer,
1529                                       cmd->request_bufflen, dir);
1530                 scb->platform_data->xfer_len = cmd->request_bufflen;
1531                 scb->platform_data->buf_busaddr = addr;
1532                 sg = ahd_sg_setup(ahd, scb, sg, addr,
1533                                   cmd->request_bufflen, /*last*/TRUE);
1534         }
1535
1536         LIST_INSERT_HEAD(&ahd->pending_scbs, scb, pending_links);
1537         dev->openings--;
1538         dev->active++;
1539         dev->commands_issued++;
1540
1541         if ((dev->flags & AHD_DEV_PERIODIC_OTAG) != 0)
1542                 dev->commands_since_idle_or_otag++;
1543         scb->flags |= SCB_ACTIVE;
1544         ahd_queue_scb(ahd, scb);
1545
1546         return 0;
1547 }
1548
1549 /*
1550  * SCSI controller interrupt handler.
1551  */
1552 irqreturn_t
1553 ahd_linux_isr(int irq, void *dev_id, struct pt_regs * regs)
1554 {
1555         struct  ahd_softc *ahd;
1556         u_long  flags;
1557         int     ours;
1558
1559         ahd = (struct ahd_softc *) dev_id;
1560         ahd_lock(ahd, &flags);
1561         ours = ahd_intr(ahd);
1562         ahd_unlock(ahd, &flags);
1563         return IRQ_RETVAL(ours);
1564 }
1565
1566 void
1567 ahd_platform_flushwork(struct ahd_softc *ahd)
1568 {
1569
1570 }
1571
1572 void
1573 ahd_send_async(struct ahd_softc *ahd, char channel,
1574                u_int target, u_int lun, ac_code code, void *arg)
1575 {
1576         switch (code) {
1577         case AC_TRANSFER_NEG:
1578         {
1579                 char    buf[80];
1580                 struct  scsi_target *starget;
1581                 struct  ahd_linux_target *targ;
1582                 struct  info_str info;
1583                 struct  ahd_initiator_tinfo *tinfo;
1584                 struct  ahd_tmode_tstate *tstate;
1585                 unsigned int target_ppr_options;
1586
1587                 BUG_ON(target == CAM_TARGET_WILDCARD);
1588
1589                 info.buffer = buf;
1590                 info.length = sizeof(buf);
1591                 info.offset = 0;
1592                 info.pos = 0;
1593                 tinfo = ahd_fetch_transinfo(ahd, channel, ahd->our_id,
1594                                             target, &tstate);
1595
1596                 /*
1597                  * Don't bother reporting results while
1598                  * negotiations are still pending.
1599                  */
1600                 if (tinfo->curr.period != tinfo->goal.period
1601                  || tinfo->curr.width != tinfo->goal.width
1602                  || tinfo->curr.offset != tinfo->goal.offset
1603                  || tinfo->curr.ppr_options != tinfo->goal.ppr_options)
1604                         if (bootverbose == 0)
1605                                 break;
1606
1607                 /*
1608                  * Don't bother reporting results that
1609                  * are identical to those last reported.
1610                  */
1611                 starget = ahd->platform_data->starget[target];
1612                 if (starget == NULL)
1613                         break;
1614                 targ = scsi_transport_target_data(starget);
1615
1616                 target_ppr_options =
1617                         (spi_dt(starget) ? MSG_EXT_PPR_DT_REQ : 0)
1618                         + (spi_qas(starget) ? MSG_EXT_PPR_QAS_REQ : 0)
1619                         + (spi_iu(starget) ?  MSG_EXT_PPR_IU_REQ : 0)
1620                         + (spi_rd_strm(starget) ? MSG_EXT_PPR_RD_STRM : 0)
1621                         + (spi_pcomp_en(starget) ? MSG_EXT_PPR_PCOMP_EN : 0)
1622                         + (spi_rti(starget) ? MSG_EXT_PPR_RTI : 0)
1623                         + (spi_wr_flow(starget) ? MSG_EXT_PPR_WR_FLOW : 0)
1624                         + (spi_hold_mcs(starget) ? MSG_EXT_PPR_HOLD_MCS : 0);
1625
1626                 if (tinfo->curr.period == spi_period(starget)
1627                     && tinfo->curr.width == spi_width(starget)
1628                     && tinfo->curr.offset == spi_offset(starget)
1629                  && tinfo->curr.ppr_options == target_ppr_options)
1630                         if (bootverbose == 0)
1631                                 break;
1632
1633                 spi_period(starget) = tinfo->curr.period;
1634                 spi_width(starget) = tinfo->curr.width;
1635                 spi_offset(starget) = tinfo->curr.offset;
1636                 spi_dt(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_DT_REQ ? 1 : 0;
1637                 spi_qas(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_QAS_REQ ? 1 : 0;
1638                 spi_iu(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ ? 1 : 0;
1639                 spi_rd_strm(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_RD_STRM ? 1 : 0;
1640                 spi_pcomp_en(starget) =  tinfo->curr.ppr_options & MSG_EXT_PPR_PCOMP_EN ? 1 : 0;
1641                 spi_rti(starget) =  tinfo->curr.ppr_options &  MSG_EXT_PPR_RTI ? 1 : 0;
1642                 spi_wr_flow(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_WR_FLOW ? 1 : 0;
1643                 spi_hold_mcs(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_HOLD_MCS ? 1 : 0;
1644                 spi_display_xfer_agreement(starget);
1645                 break;
1646         }
1647         case AC_SENT_BDR:
1648         {
1649                 WARN_ON(lun != CAM_LUN_WILDCARD);
1650                 scsi_report_device_reset(ahd->platform_data->host,
1651                                          channel - 'A', target);
1652                 break;
1653         }
1654         case AC_BUS_RESET:
1655                 if (ahd->platform_data->host != NULL) {
1656                         scsi_report_bus_reset(ahd->platform_data->host,
1657                                               channel - 'A');
1658                 }
1659                 break;
1660         default:
1661                 panic("ahd_send_async: Unexpected async event");
1662         }
1663 }
1664
1665 /*
1666  * Calls the higher level scsi done function and frees the scb.
1667  */
1668 void
1669 ahd_done(struct ahd_softc *ahd, struct scb *scb)
1670 {
1671         struct scsi_cmnd *cmd;
1672         struct    ahd_linux_device *dev;
1673
1674         if ((scb->flags & SCB_ACTIVE) == 0) {
1675                 printf("SCB %d done'd twice\n", SCB_GET_TAG(scb));
1676                 ahd_dump_card_state(ahd);
1677                 panic("Stopping for safety");
1678         }
1679         LIST_REMOVE(scb, pending_links);
1680         cmd = scb->io_ctx;
1681         dev = scb->platform_data->dev;
1682         dev->active--;
1683         dev->openings++;
1684         if ((cmd->result & (CAM_DEV_QFRZN << 16)) != 0) {
1685                 cmd->result &= ~(CAM_DEV_QFRZN << 16);
1686                 dev->qfrozen--;
1687         }
1688         ahd_linux_unmap_scb(ahd, scb);
1689
1690         /*
1691          * Guard against stale sense data.
1692          * The Linux mid-layer assumes that sense
1693          * was retrieved anytime the first byte of
1694          * the sense buffer looks "sane".
1695          */
1696         cmd->sense_buffer[0] = 0;
1697         if (ahd_get_transaction_status(scb) == CAM_REQ_INPROG) {
1698                 uint32_t amount_xferred;
1699
1700                 amount_xferred =
1701                     ahd_get_transfer_length(scb) - ahd_get_residual(scb);
1702                 if ((scb->flags & SCB_TRANSMISSION_ERROR) != 0) {
1703 #ifdef AHD_DEBUG
1704                         if ((ahd_debug & AHD_SHOW_MISC) != 0) {
1705                                 ahd_print_path(ahd, scb);
1706                                 printf("Set CAM_UNCOR_PARITY\n");
1707                         }
1708 #endif
1709                         ahd_set_transaction_status(scb, CAM_UNCOR_PARITY);
1710 #ifdef AHD_REPORT_UNDERFLOWS
1711                 /*
1712                  * This code is disabled by default as some
1713                  * clients of the SCSI system do not properly
1714                  * initialize the underflow parameter.  This
1715                  * results in spurious termination of commands
1716                  * that complete as expected (e.g. underflow is
1717                  * allowed as command can return variable amounts
1718                  * of data.
1719                  */
1720                 } else if (amount_xferred < scb->io_ctx->underflow) {
1721                         u_int i;
1722
1723                         ahd_print_path(ahd, scb);
1724                         printf("CDB:");
1725                         for (i = 0; i < scb->io_ctx->cmd_len; i++)
1726                                 printf(" 0x%x", scb->io_ctx->cmnd[i]);
1727                         printf("\n");
1728                         ahd_print_path(ahd, scb);
1729                         printf("Saw underflow (%ld of %ld bytes). "
1730                                "Treated as error\n",
1731                                 ahd_get_residual(scb),
1732                                 ahd_get_transfer_length(scb));
1733                         ahd_set_transaction_status(scb, CAM_DATA_RUN_ERR);
1734 #endif
1735                 } else {
1736                         ahd_set_transaction_status(scb, CAM_REQ_CMP);
1737                 }
1738         } else if (ahd_get_transaction_status(scb) == CAM_SCSI_STATUS_ERROR) {
1739                 ahd_linux_handle_scsi_status(ahd, cmd->device, scb);
1740         }
1741
1742         if (dev->openings == 1
1743          && ahd_get_transaction_status(scb) == CAM_REQ_CMP
1744          && ahd_get_scsi_status(scb) != SCSI_STATUS_QUEUE_FULL)
1745                 dev->tag_success_count++;
1746         /*
1747          * Some devices deal with temporary internal resource
1748          * shortages by returning queue full.  When the queue
1749          * full occurrs, we throttle back.  Slowly try to get
1750          * back to our previous queue depth.
1751          */
1752         if ((dev->openings + dev->active) < dev->maxtags
1753          && dev->tag_success_count > AHD_TAG_SUCCESS_INTERVAL) {
1754                 dev->tag_success_count = 0;
1755                 dev->openings++;
1756         }
1757
1758         if (dev->active == 0)
1759                 dev->commands_since_idle_or_otag = 0;
1760
1761         if ((scb->flags & SCB_RECOVERY_SCB) != 0) {
1762                 printf("Recovery SCB completes\n");
1763                 if (ahd_get_transaction_status(scb) == CAM_BDR_SENT
1764                  || ahd_get_transaction_status(scb) == CAM_REQ_ABORTED)
1765                         ahd_set_transaction_status(scb, CAM_CMD_TIMEOUT);
1766                 if ((ahd->platform_data->flags & AHD_SCB_UP_EH_SEM) != 0) {
1767                         ahd->platform_data->flags &= ~AHD_SCB_UP_EH_SEM;
1768                         up(&ahd->platform_data->eh_sem);
1769                 }
1770         }
1771
1772         ahd_free_scb(ahd, scb);
1773         ahd_linux_queue_cmd_complete(ahd, cmd);
1774 }
1775
1776 static void
1777 ahd_linux_handle_scsi_status(struct ahd_softc *ahd,
1778                              struct scsi_device *sdev, struct scb *scb)
1779 {
1780         struct  ahd_devinfo devinfo;
1781         struct ahd_linux_device *dev = scsi_transport_device_data(sdev);
1782
1783         ahd_compile_devinfo(&devinfo,
1784                             ahd->our_id,
1785                             sdev->sdev_target->id, sdev->lun,
1786                             sdev->sdev_target->channel == 0 ? 'A' : 'B',
1787                             ROLE_INITIATOR);
1788
1789         /*
1790          * We don't currently trust the mid-layer to
1791          * properly deal with queue full or busy.  So,
1792          * when one occurs, we tell the mid-layer to
1793          * unconditionally requeue the command to us
1794          * so that we can retry it ourselves.  We also
1795          * implement our own throttling mechanism so
1796          * we don't clobber the device with too many
1797          * commands.
1798          */
1799         switch (ahd_get_scsi_status(scb)) {
1800         default:
1801                 break;
1802         case SCSI_STATUS_CHECK_COND:
1803         case SCSI_STATUS_CMD_TERMINATED:
1804         {
1805                 struct scsi_cmnd *cmd;
1806
1807                 /*
1808                  * Copy sense information to the OS's cmd
1809                  * structure if it is available.
1810                  */
1811                 cmd = scb->io_ctx;
1812                 if ((scb->flags & (SCB_SENSE|SCB_PKT_SENSE)) != 0) {
1813                         struct scsi_status_iu_header *siu;
1814                         u_int sense_size;
1815                         u_int sense_offset;
1816
1817                         if (scb->flags & SCB_SENSE) {
1818                                 sense_size = MIN(sizeof(struct scsi_sense_data)
1819                                                - ahd_get_sense_residual(scb),
1820                                                  sizeof(cmd->sense_buffer));
1821                                 sense_offset = 0;
1822                         } else {
1823                                 /*
1824                                  * Copy only the sense data into the provided
1825                                  * buffer.
1826                                  */
1827                                 siu = (struct scsi_status_iu_header *)
1828                                     scb->sense_data;
1829                                 sense_size = MIN(scsi_4btoul(siu->sense_length),
1830                                                 sizeof(cmd->sense_buffer));
1831                                 sense_offset = SIU_SENSE_OFFSET(siu);
1832                         }
1833
1834                         memset(cmd->sense_buffer, 0, sizeof(cmd->sense_buffer));
1835                         memcpy(cmd->sense_buffer,
1836                                ahd_get_sense_buf(ahd, scb)
1837                                + sense_offset, sense_size);
1838                         cmd->result |= (DRIVER_SENSE << 24);
1839
1840 #ifdef AHD_DEBUG
1841                         if (ahd_debug & AHD_SHOW_SENSE) {
1842                                 int i;
1843
1844                                 printf("Copied %d bytes of sense data at %d:",
1845                                        sense_size, sense_offset);
1846                                 for (i = 0; i < sense_size; i++) {
1847                                         if ((i & 0xF) == 0)
1848                                                 printf("\n");
1849                                         printf("0x%x ", cmd->sense_buffer[i]);
1850                                 }
1851                                 printf("\n");
1852                         }
1853 #endif
1854                 }
1855                 break;
1856         }
1857         case SCSI_STATUS_QUEUE_FULL:
1858                 /*
1859                  * By the time the core driver has returned this
1860                  * command, all other commands that were queued
1861                  * to us but not the device have been returned.
1862                  * This ensures that dev->active is equal to
1863                  * the number of commands actually queued to
1864                  * the device.
1865                  */
1866                 dev->tag_success_count = 0;
1867                 if (dev->active != 0) {
1868                         /*
1869                          * Drop our opening count to the number
1870                          * of commands currently outstanding.
1871                          */
1872                         dev->openings = 0;
1873 #ifdef AHD_DEBUG
1874                         if ((ahd_debug & AHD_SHOW_QFULL) != 0) {
1875                                 ahd_print_path(ahd, scb);
1876                                 printf("Dropping tag count to %d\n",
1877                                        dev->active);
1878                         }
1879 #endif
1880                         if (dev->active == dev->tags_on_last_queuefull) {
1881
1882                                 dev->last_queuefull_same_count++;
1883                                 /*
1884                                  * If we repeatedly see a queue full
1885                                  * at the same queue depth, this
1886                                  * device has a fixed number of tag
1887                                  * slots.  Lock in this tag depth
1888                                  * so we stop seeing queue fulls from
1889                                  * this device.
1890                                  */
1891                                 if (dev->last_queuefull_same_count
1892                                  == AHD_LOCK_TAGS_COUNT) {
1893                                         dev->maxtags = dev->active;
1894                                         ahd_print_path(ahd, scb);
1895                                         printf("Locking max tag count at %d\n",
1896                                                dev->active);
1897                                 }
1898                         } else {
1899                                 dev->tags_on_last_queuefull = dev->active;
1900                                 dev->last_queuefull_same_count = 0;
1901                         }
1902                         ahd_set_transaction_status(scb, CAM_REQUEUE_REQ);
1903                         ahd_set_scsi_status(scb, SCSI_STATUS_OK);
1904                         ahd_platform_set_tags(ahd, &devinfo,
1905                                      (dev->flags & AHD_DEV_Q_BASIC)
1906                                    ? AHD_QUEUE_BASIC : AHD_QUEUE_TAGGED);
1907                         break;
1908                 }
1909                 /*
1910                  * Drop down to a single opening, and treat this
1911                  * as if the target returned BUSY SCSI status.
1912                  */
1913                 dev->openings = 1;
1914                 ahd_platform_set_tags(ahd, &devinfo,
1915                              (dev->flags & AHD_DEV_Q_BASIC)
1916                            ? AHD_QUEUE_BASIC : AHD_QUEUE_TAGGED);
1917                 ahd_set_scsi_status(scb, SCSI_STATUS_BUSY);
1918         }
1919 }
1920
1921 static void
1922 ahd_linux_queue_cmd_complete(struct ahd_softc *ahd, struct scsi_cmnd *cmd)
1923 {
1924         /*
1925          * Map CAM error codes into Linux Error codes.  We
1926          * avoid the conversion so that the DV code has the
1927          * full error information available when making
1928          * state change decisions.
1929          */
1930         {
1931                 uint32_t status;
1932                 u_int new_status;
1933
1934                 status = ahd_cmd_get_transaction_status(cmd);
1935                 switch (status) {
1936                 case CAM_REQ_INPROG:
1937                 case CAM_REQ_CMP:
1938                 case CAM_SCSI_STATUS_ERROR:
1939                         new_status = DID_OK;
1940                         break;
1941                 case CAM_REQ_ABORTED:
1942                         new_status = DID_ABORT;
1943                         break;
1944                 case CAM_BUSY:
1945                         new_status = DID_BUS_BUSY;
1946                         break;
1947                 case CAM_REQ_INVALID:
1948                 case CAM_PATH_INVALID:
1949                         new_status = DID_BAD_TARGET;
1950                         break;
1951                 case CAM_SEL_TIMEOUT:
1952                         new_status = DID_NO_CONNECT;
1953                         break;
1954                 case CAM_SCSI_BUS_RESET:
1955                 case CAM_BDR_SENT:
1956                         new_status = DID_RESET;
1957                         break;
1958                 case CAM_UNCOR_PARITY:
1959                         new_status = DID_PARITY;
1960                         break;
1961                 case CAM_CMD_TIMEOUT:
1962                         new_status = DID_TIME_OUT;
1963                         break;
1964                 case CAM_UA_ABORT:
1965                 case CAM_REQ_CMP_ERR:
1966                 case CAM_AUTOSENSE_FAIL:
1967                 case CAM_NO_HBA:
1968                 case CAM_DATA_RUN_ERR:
1969                 case CAM_UNEXP_BUSFREE:
1970                 case CAM_SEQUENCE_FAIL:
1971                 case CAM_CCB_LEN_ERR:
1972                 case CAM_PROVIDE_FAIL:
1973                 case CAM_REQ_TERMIO:
1974                 case CAM_UNREC_HBA_ERROR:
1975                 case CAM_REQ_TOO_BIG:
1976                         new_status = DID_ERROR;
1977                         break;
1978                 case CAM_REQUEUE_REQ:
1979                         new_status = DID_REQUEUE;
1980                         break;
1981                 default:
1982                         /* We should never get here */
1983                         new_status = DID_ERROR;
1984                         break;
1985                 }
1986
1987                 ahd_cmd_set_transaction_status(cmd, new_status);
1988         }
1989
1990         cmd->scsi_done(cmd);
1991 }
1992
1993 static void
1994 ahd_linux_sem_timeout(u_long arg)
1995 {
1996         struct  ahd_softc *ahd;
1997         u_long  s;
1998
1999         ahd = (struct ahd_softc *)arg;
2000
2001         ahd_lock(ahd, &s);
2002         if ((ahd->platform_data->flags & AHD_SCB_UP_EH_SEM) != 0) {
2003                 ahd->platform_data->flags &= ~AHD_SCB_UP_EH_SEM;
2004                 up(&ahd->platform_data->eh_sem);
2005         }
2006         ahd_unlock(ahd, &s);
2007 }
2008
2009 void
2010 ahd_freeze_simq(struct ahd_softc *ahd)
2011 {
2012         ahd->platform_data->qfrozen++;
2013         if (ahd->platform_data->qfrozen == 1) {
2014                 scsi_block_requests(ahd->platform_data->host);
2015                 ahd_platform_abort_scbs(ahd, CAM_TARGET_WILDCARD, ALL_CHANNELS,
2016                                         CAM_LUN_WILDCARD, SCB_LIST_NULL,
2017                                         ROLE_INITIATOR, CAM_REQUEUE_REQ);
2018         }
2019 }
2020
2021 void
2022 ahd_release_simq(struct ahd_softc *ahd)
2023 {
2024         u_long s;
2025         int    unblock_reqs;
2026
2027         unblock_reqs = 0;
2028         ahd_lock(ahd, &s);
2029         if (ahd->platform_data->qfrozen > 0)
2030                 ahd->platform_data->qfrozen--;
2031         if (ahd->platform_data->qfrozen == 0) {
2032                 unblock_reqs = 1;
2033         }
2034         ahd_unlock(ahd, &s);
2035         /*
2036          * There is still a race here.  The mid-layer
2037          * should keep its own freeze count and use
2038          * a bottom half handler to run the queues
2039          * so we can unblock with our own lock held.
2040          */
2041         if (unblock_reqs)
2042                 scsi_unblock_requests(ahd->platform_data->host);
2043 }
2044
2045 static int
2046 ahd_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag)
2047 {
2048         struct ahd_softc *ahd;
2049         struct ahd_linux_device *dev;
2050         struct scb *pending_scb;
2051         u_int  saved_scbptr;
2052         u_int  active_scbptr;
2053         u_int  last_phase;
2054         u_int  saved_scsiid;
2055         u_int  cdb_byte;
2056         int    retval;
2057         int    was_paused;
2058         int    paused;
2059         int    wait;
2060         int    disconnected;
2061         ahd_mode_state saved_modes;
2062         unsigned long flags;
2063
2064         pending_scb = NULL;
2065         paused = FALSE;
2066         wait = FALSE;
2067         ahd = *(struct ahd_softc **)cmd->device->host->hostdata;
2068
2069         scmd_printk(KERN_INFO, cmd,
2070                "Attempting to queue a%s message:",
2071                flag == SCB_ABORT ? "n ABORT" : " TARGET RESET");
2072
2073         printf("CDB:");
2074         for (cdb_byte = 0; cdb_byte < cmd->cmd_len; cdb_byte++)
2075                 printf(" 0x%x", cmd->cmnd[cdb_byte]);
2076         printf("\n");
2077
2078         ahd_lock(ahd, &flags);
2079
2080         /*
2081          * First determine if we currently own this command.
2082          * Start by searching the device queue.  If not found
2083          * there, check the pending_scb list.  If not found
2084          * at all, and the system wanted us to just abort the
2085          * command, return success.
2086          */
2087         dev = scsi_transport_device_data(cmd->device);
2088
2089         if (dev == NULL) {
2090                 /*
2091                  * No target device for this command exists,
2092                  * so we must not still own the command.
2093                  */
2094                 scmd_printk(KERN_INFO, cmd, "Is not an active device\n");
2095                 retval = SUCCESS;
2096                 goto no_cmd;
2097         }
2098
2099         /*
2100          * See if we can find a matching cmd in the pending list.
2101          */
2102         LIST_FOREACH(pending_scb, &ahd->pending_scbs, pending_links) {
2103                 if (pending_scb->io_ctx == cmd)
2104                         break;
2105         }
2106
2107         if (pending_scb == NULL && flag == SCB_DEVICE_RESET) {
2108
2109                 /* Any SCB for this device will do for a target reset */
2110                 LIST_FOREACH(pending_scb, &ahd->pending_scbs, pending_links) {
2111                         if (ahd_match_scb(ahd, pending_scb,
2112                                           scmd_id(cmd),
2113                                           scmd_channel(cmd) + 'A',
2114                                           CAM_LUN_WILDCARD,
2115                                           SCB_LIST_NULL, ROLE_INITIATOR))
2116                                 break;
2117                 }
2118         }
2119
2120         if (pending_scb == NULL) {
2121                 scmd_printk(KERN_INFO, cmd, "Command not found\n");
2122                 goto no_cmd;
2123         }
2124
2125         if ((pending_scb->flags & SCB_RECOVERY_SCB) != 0) {
2126                 /*
2127                  * We can't queue two recovery actions using the same SCB
2128                  */
2129                 retval = FAILED;
2130                 goto  done;
2131         }
2132
2133         /*
2134          * Ensure that the card doesn't do anything
2135          * behind our back.  Also make sure that we
2136          * didn't "just" miss an interrupt that would
2137          * affect this cmd.
2138          */
2139         was_paused = ahd_is_paused(ahd);
2140         ahd_pause_and_flushwork(ahd);
2141         paused = TRUE;
2142
2143         if ((pending_scb->flags & SCB_ACTIVE) == 0) {
2144                 scmd_printk(KERN_INFO, cmd, "Command already completed\n");
2145                 goto no_cmd;
2146         }
2147
2148         printf("%s: At time of recovery, card was %spaused\n",
2149                ahd_name(ahd), was_paused ? "" : "not ");
2150         ahd_dump_card_state(ahd);
2151
2152         disconnected = TRUE;
2153         if (flag == SCB_ABORT) {
2154                 if (ahd_search_qinfifo(ahd, cmd->device->id,
2155                                        cmd->device->channel + 'A',
2156                                        cmd->device->lun,
2157                                        pending_scb->hscb->tag,
2158                                        ROLE_INITIATOR, CAM_REQ_ABORTED,
2159                                        SEARCH_COMPLETE) > 0) {
2160                         printf("%s:%d:%d:%d: Cmd aborted from QINFIFO\n",
2161                                ahd_name(ahd), cmd->device->channel,
2162                                cmd->device->id, cmd->device->lun);
2163                         retval = SUCCESS;
2164                         goto done;
2165                 }
2166         } else if (ahd_search_qinfifo(ahd, cmd->device->id,
2167                                       cmd->device->channel + 'A',
2168                                       cmd->device->lun, pending_scb->hscb->tag,
2169                                       ROLE_INITIATOR, /*status*/0,
2170                                       SEARCH_COUNT) > 0) {
2171                 disconnected = FALSE;
2172         }
2173
2174         saved_modes = ahd_save_modes(ahd);
2175         ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
2176         last_phase = ahd_inb(ahd, LASTPHASE);
2177         saved_scbptr = ahd_get_scbptr(ahd);
2178         active_scbptr = saved_scbptr;
2179         if (disconnected && (ahd_inb(ahd, SEQ_FLAGS) & NOT_IDENTIFIED) == 0) {
2180                 struct scb *bus_scb;
2181
2182                 bus_scb = ahd_lookup_scb(ahd, active_scbptr);
2183                 if (bus_scb == pending_scb)
2184                         disconnected = FALSE;
2185                 else if (flag != SCB_ABORT
2186                          && ahd_inb(ahd, SAVED_SCSIID) == pending_scb->hscb->scsiid
2187                          && ahd_inb(ahd, SAVED_LUN) == SCB_GET_LUN(pending_scb))
2188                         disconnected = FALSE;
2189         }
2190
2191         /*
2192          * At this point, pending_scb is the scb associated with the
2193          * passed in command.  That command is currently active on the
2194          * bus or is in the disconnected state.
2195          */
2196         saved_scsiid = ahd_inb(ahd, SAVED_SCSIID);
2197         if (last_phase != P_BUSFREE
2198          && (SCB_GET_TAG(pending_scb) == active_scbptr
2199              || (flag == SCB_DEVICE_RESET
2200                  && SCSIID_TARGET(ahd, saved_scsiid) == scmd_id(cmd)))) {
2201
2202                 /*
2203                  * We're active on the bus, so assert ATN
2204                  * and hope that the target responds.
2205                  */
2206                 pending_scb = ahd_lookup_scb(ahd, active_scbptr);
2207                 pending_scb->flags |= SCB_RECOVERY_SCB|flag;
2208                 ahd_outb(ahd, MSG_OUT, HOST_MSG);
2209                 ahd_outb(ahd, SCSISIGO, last_phase|ATNO);
2210                 scmd_printk(KERN_INFO, cmd, "Device is active, asserting ATN\n");
2211                 wait = TRUE;
2212         } else if (disconnected) {
2213
2214                 /*
2215                  * Actually re-queue this SCB in an attempt
2216                  * to select the device before it reconnects.
2217                  */
2218                 pending_scb->flags |= SCB_RECOVERY_SCB|SCB_ABORT;
2219                 ahd_set_scbptr(ahd, SCB_GET_TAG(pending_scb));
2220                 pending_scb->hscb->cdb_len = 0;
2221                 pending_scb->hscb->task_attribute = 0;
2222                 pending_scb->hscb->task_management = SIU_TASKMGMT_ABORT_TASK;
2223
2224                 if ((pending_scb->flags & SCB_PACKETIZED) != 0) {
2225                         /*
2226                          * Mark the SCB has having an outstanding
2227                          * task management function.  Should the command
2228                          * complete normally before the task management
2229                          * function can be sent, the host will be notified
2230                          * to abort our requeued SCB.
2231                          */
2232                         ahd_outb(ahd, SCB_TASK_MANAGEMENT,
2233                                  pending_scb->hscb->task_management);
2234                 } else {
2235                         /*
2236                          * If non-packetized, set the MK_MESSAGE control
2237                          * bit indicating that we desire to send a message.
2238                          * We also set the disconnected flag since there is
2239                          * no guarantee that our SCB control byte matches
2240                          * the version on the card.  We don't want the
2241                          * sequencer to abort the command thinking an
2242                          * unsolicited reselection occurred.
2243                          */
2244                         pending_scb->hscb->control |= MK_MESSAGE|DISCONNECTED;
2245
2246                         /*
2247                          * The sequencer will never re-reference the
2248                          * in-core SCB.  To make sure we are notified
2249                          * during reslection, set the MK_MESSAGE flag in
2250                          * the card's copy of the SCB.
2251                          */
2252                         ahd_outb(ahd, SCB_CONTROL,
2253                                  ahd_inb(ahd, SCB_CONTROL)|MK_MESSAGE);
2254                 }
2255
2256                 /*
2257                  * Clear out any entries in the QINFIFO first
2258                  * so we are the next SCB for this target
2259                  * to run.
2260                  */
2261                 ahd_search_qinfifo(ahd, cmd->device->id,
2262                                    cmd->device->channel + 'A', cmd->device->lun,
2263                                    SCB_LIST_NULL, ROLE_INITIATOR,
2264                                    CAM_REQUEUE_REQ, SEARCH_COMPLETE);
2265                 ahd_qinfifo_requeue_tail(ahd, pending_scb);
2266                 ahd_set_scbptr(ahd, saved_scbptr);
2267                 ahd_print_path(ahd, pending_scb);
2268                 printf("Device is disconnected, re-queuing SCB\n");
2269                 wait = TRUE;
2270         } else {
2271                 scmd_printk(KERN_INFO, cmd, "Unable to deliver message\n");
2272                 retval = FAILED;
2273                 goto done;
2274         }
2275
2276 no_cmd:
2277         /*
2278          * Our assumption is that if we don't have the command, no
2279          * recovery action was required, so we return success.  Again,
2280          * the semantics of the mid-layer recovery engine are not
2281          * well defined, so this may change in time.
2282          */
2283         retval = SUCCESS;
2284 done:
2285         if (paused)
2286                 ahd_unpause(ahd);
2287         if (wait) {
2288                 struct timer_list timer;
2289                 int ret;
2290
2291                 ahd->platform_data->flags |= AHD_SCB_UP_EH_SEM;
2292                 ahd_unlock(ahd, &flags);
2293
2294                 init_timer(&timer);
2295                 timer.data = (u_long)ahd;
2296                 timer.expires = jiffies + (5 * HZ);
2297                 timer.function = ahd_linux_sem_timeout;
2298                 add_timer(&timer);
2299                 printf("Recovery code sleeping\n");
2300                 down(&ahd->platform_data->eh_sem);
2301                 printf("Recovery code awake\n");
2302                 ret = del_timer_sync(&timer);
2303                 if (ret == 0) {
2304                         printf("Timer Expired\n");
2305                         retval = FAILED;
2306                 }
2307         }
2308                 ahd_unlock(ahd, &flags);
2309         return (retval);
2310 }
2311
2312 static void ahd_linux_set_width(struct scsi_target *starget, int width)
2313 {
2314         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2315         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2316         struct ahd_devinfo devinfo;
2317         unsigned long flags;
2318
2319         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2320                             starget->channel + 'A', ROLE_INITIATOR);
2321         ahd_lock(ahd, &flags);
2322         ahd_set_width(ahd, &devinfo, width, AHD_TRANS_GOAL, FALSE);
2323         ahd_unlock(ahd, &flags);
2324 }
2325
2326 static void ahd_linux_set_period(struct scsi_target *starget, int period)
2327 {
2328         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2329         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2330         struct ahd_tmode_tstate *tstate;
2331         struct ahd_initiator_tinfo *tinfo
2332                 = ahd_fetch_transinfo(ahd,
2333                                       starget->channel + 'A',
2334                                       shost->this_id, starget->id, &tstate);
2335         struct ahd_devinfo devinfo;
2336         unsigned int ppr_options = tinfo->goal.ppr_options;
2337         unsigned int dt;
2338         unsigned long flags;
2339         unsigned long offset = tinfo->goal.offset;
2340
2341 #ifdef AHD_DEBUG
2342         if ((ahd_debug & AHD_SHOW_DV) != 0)
2343                 printf("%s: set period to %d\n", ahd_name(ahd), period);
2344 #endif
2345         if (offset == 0)
2346                 offset = MAX_OFFSET;
2347
2348         if (period < 8)
2349                 period = 8;
2350         if (period < 10) {
2351                 ppr_options |= MSG_EXT_PPR_DT_REQ;
2352                 if (period == 8)
2353                         ppr_options |= MSG_EXT_PPR_IU_REQ;
2354         }
2355
2356         dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2357
2358         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2359                             starget->channel + 'A', ROLE_INITIATOR);
2360
2361         /* all PPR requests apart from QAS require wide transfers */
2362         if (ppr_options & ~MSG_EXT_PPR_QAS_REQ) {
2363                 if (spi_width(starget) == 0)
2364                         ppr_options &= MSG_EXT_PPR_QAS_REQ;
2365         }
2366
2367         ahd_find_syncrate(ahd, &period, &ppr_options,
2368                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2369
2370         ahd_lock(ahd, &flags);
2371         ahd_set_syncrate(ahd, &devinfo, period, offset,
2372                          ppr_options, AHD_TRANS_GOAL, FALSE);
2373         ahd_unlock(ahd, &flags);
2374 }
2375
2376 static void ahd_linux_set_offset(struct scsi_target *starget, int offset)
2377 {
2378         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2379         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2380         struct ahd_tmode_tstate *tstate;
2381         struct ahd_initiator_tinfo *tinfo
2382                 = ahd_fetch_transinfo(ahd,
2383                                       starget->channel + 'A',
2384                                       shost->this_id, starget->id, &tstate);
2385         struct ahd_devinfo devinfo;
2386         unsigned int ppr_options = 0;
2387         unsigned int period = 0;
2388         unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2389         unsigned long flags;
2390
2391 #ifdef AHD_DEBUG
2392         if ((ahd_debug & AHD_SHOW_DV) != 0)
2393                 printf("%s: set offset to %d\n", ahd_name(ahd), offset);
2394 #endif
2395
2396         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2397                             starget->channel + 'A', ROLE_INITIATOR);
2398         if (offset != 0) {
2399                 period = tinfo->goal.period;
2400                 ppr_options = tinfo->goal.ppr_options;
2401                 ahd_find_syncrate(ahd, &period, &ppr_options,
2402                                   dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2403         }
2404
2405         ahd_lock(ahd, &flags);
2406         ahd_set_syncrate(ahd, &devinfo, period, offset, ppr_options,
2407                          AHD_TRANS_GOAL, FALSE);
2408         ahd_unlock(ahd, &flags);
2409 }
2410
2411 static void ahd_linux_set_dt(struct scsi_target *starget, int dt)
2412 {
2413         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2414         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2415         struct ahd_tmode_tstate *tstate;
2416         struct ahd_initiator_tinfo *tinfo
2417                 = ahd_fetch_transinfo(ahd,
2418                                       starget->channel + 'A',
2419                                       shost->this_id, starget->id, &tstate);
2420         struct ahd_devinfo devinfo;
2421         unsigned int ppr_options = tinfo->goal.ppr_options
2422                 & ~MSG_EXT_PPR_DT_REQ;
2423         unsigned int period = tinfo->goal.period;
2424         unsigned int width = tinfo->goal.width;
2425         unsigned long flags;
2426
2427 #ifdef AHD_DEBUG
2428         if ((ahd_debug & AHD_SHOW_DV) != 0)
2429                 printf("%s: %s DT\n", ahd_name(ahd),
2430                        dt ? "enabling" : "disabling");
2431 #endif
2432         if (dt) {
2433                 ppr_options |= MSG_EXT_PPR_DT_REQ;
2434                 if (!width)
2435                         ahd_linux_set_width(starget, 1);
2436         } else {
2437                 if (period <= 9)
2438                         period = 10; /* If resetting DT, period must be >= 25ns */
2439                 /* IU is invalid without DT set */
2440                 ppr_options &= ~MSG_EXT_PPR_IU_REQ;
2441         }
2442         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2443                             starget->channel + 'A', ROLE_INITIATOR);
2444         ahd_find_syncrate(ahd, &period, &ppr_options,
2445                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2446
2447         ahd_lock(ahd, &flags);
2448         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2449                          ppr_options, AHD_TRANS_GOAL, FALSE);
2450         ahd_unlock(ahd, &flags);
2451 }
2452
2453 static void ahd_linux_set_qas(struct scsi_target *starget, int qas)
2454 {
2455         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2456         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2457         struct ahd_tmode_tstate *tstate;
2458         struct ahd_initiator_tinfo *tinfo
2459                 = ahd_fetch_transinfo(ahd,
2460                                       starget->channel + 'A',
2461                                       shost->this_id, starget->id, &tstate);
2462         struct ahd_devinfo devinfo;
2463         unsigned int ppr_options = tinfo->goal.ppr_options
2464                 & ~MSG_EXT_PPR_QAS_REQ;
2465         unsigned int period = tinfo->goal.period;
2466         unsigned int dt;
2467         unsigned long flags;
2468
2469 #ifdef AHD_DEBUG
2470         if ((ahd_debug & AHD_SHOW_DV) != 0)
2471                 printf("%s: %s QAS\n", ahd_name(ahd),
2472                        qas ? "enabling" : "disabling");
2473 #endif
2474
2475         if (qas) {
2476                 ppr_options |= MSG_EXT_PPR_QAS_REQ;
2477         }
2478
2479         dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2480
2481         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2482                             starget->channel + 'A', ROLE_INITIATOR);
2483         ahd_find_syncrate(ahd, &period, &ppr_options,
2484                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2485
2486         ahd_lock(ahd, &flags);
2487         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2488                          ppr_options, AHD_TRANS_GOAL, FALSE);
2489         ahd_unlock(ahd, &flags);
2490 }
2491
2492 static void ahd_linux_set_iu(struct scsi_target *starget, int iu)
2493 {
2494         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2495         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2496         struct ahd_tmode_tstate *tstate;
2497         struct ahd_initiator_tinfo *tinfo
2498                 = ahd_fetch_transinfo(ahd,
2499                                       starget->channel + 'A',
2500                                       shost->this_id, starget->id, &tstate);
2501         struct ahd_devinfo devinfo;
2502         unsigned int ppr_options = tinfo->goal.ppr_options
2503                 & ~MSG_EXT_PPR_IU_REQ;
2504         unsigned int period = tinfo->goal.period;
2505         unsigned int dt;
2506         unsigned long flags;
2507
2508 #ifdef AHD_DEBUG
2509         if ((ahd_debug & AHD_SHOW_DV) != 0)
2510                 printf("%s: %s IU\n", ahd_name(ahd),
2511                        iu ? "enabling" : "disabling");
2512 #endif
2513
2514         if (iu) {
2515                 ppr_options |= MSG_EXT_PPR_IU_REQ;
2516                 ppr_options |= MSG_EXT_PPR_DT_REQ; /* IU requires DT */
2517         }
2518
2519         dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2520
2521         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2522                             starget->channel + 'A', ROLE_INITIATOR);
2523         ahd_find_syncrate(ahd, &period, &ppr_options,
2524                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2525
2526         ahd_lock(ahd, &flags);
2527         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2528                          ppr_options, AHD_TRANS_GOAL, FALSE);
2529         ahd_unlock(ahd, &flags);
2530 }
2531
2532 static void ahd_linux_set_rd_strm(struct scsi_target *starget, int rdstrm)
2533 {
2534         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2535         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2536         struct ahd_tmode_tstate *tstate;
2537         struct ahd_initiator_tinfo *tinfo
2538                 = ahd_fetch_transinfo(ahd,
2539                                       starget->channel + 'A',
2540                                       shost->this_id, starget->id, &tstate);
2541         struct ahd_devinfo devinfo;
2542         unsigned int ppr_options = tinfo->goal.ppr_options
2543                 & ~MSG_EXT_PPR_RD_STRM;
2544         unsigned int period = tinfo->goal.period;
2545         unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2546         unsigned long flags;
2547
2548 #ifdef AHD_DEBUG
2549         if ((ahd_debug & AHD_SHOW_DV) != 0)
2550                 printf("%s: %s Read Streaming\n", ahd_name(ahd),
2551                        rdstrm  ? "enabling" : "disabling");
2552 #endif
2553
2554         if (rdstrm)
2555                 ppr_options |= MSG_EXT_PPR_RD_STRM;
2556
2557         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2558                             starget->channel + 'A', ROLE_INITIATOR);
2559         ahd_find_syncrate(ahd, &period, &ppr_options,
2560                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2561
2562         ahd_lock(ahd, &flags);
2563         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2564                          ppr_options, AHD_TRANS_GOAL, FALSE);
2565         ahd_unlock(ahd, &flags);
2566 }
2567
2568 static void ahd_linux_set_wr_flow(struct scsi_target *starget, int wrflow)
2569 {
2570         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2571         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2572         struct ahd_tmode_tstate *tstate;
2573         struct ahd_initiator_tinfo *tinfo
2574                 = ahd_fetch_transinfo(ahd,
2575                                       starget->channel + 'A',
2576                                       shost->this_id, starget->id, &tstate);
2577         struct ahd_devinfo devinfo;
2578         unsigned int ppr_options = tinfo->goal.ppr_options
2579                 & ~MSG_EXT_PPR_WR_FLOW;
2580         unsigned int period = tinfo->goal.period;
2581         unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2582         unsigned long flags;
2583
2584 #ifdef AHD_DEBUG
2585         if ((ahd_debug & AHD_SHOW_DV) != 0)
2586                 printf("%s: %s Write Flow Control\n", ahd_name(ahd),
2587                        wrflow ? "enabling" : "disabling");
2588 #endif
2589
2590         if (wrflow)
2591                 ppr_options |= MSG_EXT_PPR_WR_FLOW;
2592
2593         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2594                             starget->channel + 'A', ROLE_INITIATOR);
2595         ahd_find_syncrate(ahd, &period, &ppr_options,
2596                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2597
2598         ahd_lock(ahd, &flags);
2599         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2600                          ppr_options, AHD_TRANS_GOAL, FALSE);
2601         ahd_unlock(ahd, &flags);
2602 }
2603
2604 static void ahd_linux_set_rti(struct scsi_target *starget, int rti)
2605 {
2606         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2607         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2608         struct ahd_tmode_tstate *tstate;
2609         struct ahd_initiator_tinfo *tinfo
2610                 = ahd_fetch_transinfo(ahd,
2611                                       starget->channel + 'A',
2612                                       shost->this_id, starget->id, &tstate);
2613         struct ahd_devinfo devinfo;
2614         unsigned int ppr_options = tinfo->goal.ppr_options
2615                 & ~MSG_EXT_PPR_RTI;
2616         unsigned int period = tinfo->goal.period;
2617         unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2618         unsigned long flags;
2619
2620         if ((ahd->features & AHD_RTI) == 0) {
2621 #ifdef AHD_DEBUG
2622                 if ((ahd_debug & AHD_SHOW_DV) != 0)
2623                         printf("%s: RTI not available\n", ahd_name(ahd));
2624 #endif
2625                 return;
2626         }
2627
2628 #ifdef AHD_DEBUG
2629         if ((ahd_debug & AHD_SHOW_DV) != 0)
2630                 printf("%s: %s RTI\n", ahd_name(ahd),
2631                        rti ? "enabling" : "disabling");
2632 #endif
2633
2634         if (rti)
2635                 ppr_options |= MSG_EXT_PPR_RTI;
2636
2637         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2638                             starget->channel + 'A', ROLE_INITIATOR);
2639         ahd_find_syncrate(ahd, &period, &ppr_options,
2640                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2641
2642         ahd_lock(ahd, &flags);
2643         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2644                          ppr_options, AHD_TRANS_GOAL, FALSE);
2645         ahd_unlock(ahd, &flags);
2646 }
2647
2648 static void ahd_linux_set_pcomp_en(struct scsi_target *starget, int pcomp)
2649 {
2650         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2651         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2652         struct ahd_tmode_tstate *tstate;
2653         struct ahd_initiator_tinfo *tinfo
2654                 = ahd_fetch_transinfo(ahd,
2655                                       starget->channel + 'A',
2656                                       shost->this_id, starget->id, &tstate);
2657         struct ahd_devinfo devinfo;
2658         unsigned int ppr_options = tinfo->goal.ppr_options
2659                 & ~MSG_EXT_PPR_PCOMP_EN;
2660         unsigned int period = tinfo->goal.period;
2661         unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2662         unsigned long flags;
2663
2664 #ifdef AHD_DEBUG
2665         if ((ahd_debug & AHD_SHOW_DV) != 0)
2666                 printf("%s: %s Precompensation\n", ahd_name(ahd),
2667                        pcomp ? "Enable" : "Disable");
2668 #endif
2669
2670         if (pcomp)
2671                 ppr_options |= MSG_EXT_PPR_PCOMP_EN;
2672
2673         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2674                             starget->channel + 'A', ROLE_INITIATOR);
2675         ahd_find_syncrate(ahd, &period, &ppr_options,
2676                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2677
2678         ahd_lock(ahd, &flags);
2679         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2680                          ppr_options, AHD_TRANS_GOAL, FALSE);
2681         ahd_unlock(ahd, &flags);
2682 }
2683
2684 static void ahd_linux_set_hold_mcs(struct scsi_target *starget, int hold)
2685 {
2686         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2687         struct ahd_softc *ahd = *((struct ahd_softc **)shost->hostdata);
2688         struct ahd_tmode_tstate *tstate;
2689         struct ahd_initiator_tinfo *tinfo
2690                 = ahd_fetch_transinfo(ahd,
2691                                       starget->channel + 'A',
2692                                       shost->this_id, starget->id, &tstate);
2693         struct ahd_devinfo devinfo;
2694         unsigned int ppr_options = tinfo->goal.ppr_options
2695                 & ~MSG_EXT_PPR_HOLD_MCS;
2696         unsigned int period = tinfo->goal.period;
2697         unsigned int dt = ppr_options & MSG_EXT_PPR_DT_REQ;
2698         unsigned long flags;
2699
2700         if (hold)
2701                 ppr_options |= MSG_EXT_PPR_HOLD_MCS;
2702
2703         ahd_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2704                             starget->channel + 'A', ROLE_INITIATOR);
2705         ahd_find_syncrate(ahd, &period, &ppr_options,
2706                           dt ? AHD_SYNCRATE_MAX : AHD_SYNCRATE_ULTRA2);
2707
2708         ahd_lock(ahd, &flags);
2709         ahd_set_syncrate(ahd, &devinfo, period, tinfo->goal.offset,
2710                          ppr_options, AHD_TRANS_GOAL, FALSE);
2711         ahd_unlock(ahd, &flags);
2712 }
2713
2714
2715
2716 static struct spi_function_template ahd_linux_transport_functions = {
2717         .set_offset     = ahd_linux_set_offset,
2718         .show_offset    = 1,
2719         .set_period     = ahd_linux_set_period,
2720         .show_period    = 1,
2721         .set_width      = ahd_linux_set_width,
2722         .show_width     = 1,
2723         .set_dt         = ahd_linux_set_dt,
2724         .show_dt        = 1,
2725         .set_iu         = ahd_linux_set_iu,
2726         .show_iu        = 1,
2727         .set_qas        = ahd_linux_set_qas,
2728         .show_qas       = 1,
2729         .set_rd_strm    = ahd_linux_set_rd_strm,
2730         .show_rd_strm   = 1,
2731         .set_wr_flow    = ahd_linux_set_wr_flow,
2732         .show_wr_flow   = 1,
2733         .set_rti        = ahd_linux_set_rti,
2734         .show_rti       = 1,
2735         .set_pcomp_en   = ahd_linux_set_pcomp_en,
2736         .show_pcomp_en  = 1,
2737         .set_hold_mcs   = ahd_linux_set_hold_mcs,
2738         .show_hold_mcs  = 1,
2739 };
2740
2741 static int __init
2742 ahd_linux_init(void)
2743 {
2744         int     error = 0;
2745
2746         /*
2747          * If we've been passed any parameters, process them now.
2748          */
2749         if (aic79xx)
2750                 aic79xx_setup(aic79xx);
2751
2752         ahd_linux_transport_template =
2753                 spi_attach_transport(&ahd_linux_transport_functions);
2754         if (!ahd_linux_transport_template)
2755                 return -ENODEV;
2756
2757         scsi_transport_reserve_target(ahd_linux_transport_template,
2758                                       sizeof(struct ahd_linux_target));
2759         scsi_transport_reserve_device(ahd_linux_transport_template,
2760                                       sizeof(struct ahd_linux_device));
2761
2762         error = ahd_linux_pci_init();
2763         if (error)
2764                 spi_release_transport(ahd_linux_transport_template);
2765         return error;
2766 }
2767
2768 static void __exit
2769 ahd_linux_exit(void)
2770 {
2771         ahd_linux_pci_exit();
2772         spi_release_transport(ahd_linux_transport_template);
2773 }
2774
2775 module_init(ahd_linux_init);
2776 module_exit(ahd_linux_exit);