drivers/scsi/aic7xxx/aic7xxx_osm.c

   1 /*
   2  * Adaptec AIC7xxx device driver for Linux.
   3  *
   4  * $Id: //depot/aic7xxx/linux/drivers/scsi/aic7xxx/aic7xxx_osm.c#235 $
   5  *
   6  * Copyright (c) 1994 John Aycock
   7  *   The University of Calgary Department of Computer Science.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2, or (at your option)
  12  * any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; see the file COPYING.  If not, write to
  21  * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  22  *
  23  * Sources include the Adaptec 1740 driver (aha1740.c), the Ultrastor 24F
  24  * driver (ultrastor.c), various Linux kernel source, the Adaptec EISA
  25  * config file (!adp7771.cfg), the Adaptec AHA-2740A Series User's Guide,
  26  * the Linux Kernel Hacker's Guide, Writing a SCSI Device Driver for Linux,
  27  * the Adaptec 1542 driver (aha1542.c), the Adaptec EISA overlay file
  28  * (adp7770.ovl), the Adaptec AHA-2740 Series Technical Reference Manual,
  29  * the Adaptec AIC-7770 Data Book, the ANSI SCSI specification, the
  30  * ANSI SCSI-2 specification (draft 10c), ...
  31  *
  32  * --------------------------------------------------------------------------
  33  *
  34  *  Modifications by Daniel M. Eischen (deischen@iworks.InterWorks.org):
  35  *
  36  *  Substantially modified to include support for wide and twin bus
  37  *  adapters, DMAing of SCBs, tagged queueing, IRQ sharing, bug fixes,
  38  *  SCB paging, and other rework of the code.
  39  *
  40  * --------------------------------------------------------------------------
  41  * Copyright (c) 1994-2000 Justin T. Gibbs.
  42  * Copyright (c) 2000-2001 Adaptec Inc.
  43  * All rights reserved.
  44  *
  45  * Redistribution and use in source and binary forms, with or without
  46  * modification, are permitted provided that the following conditions
  47  * are met:
  48  * 1. Redistributions of source code must retain the above copyright
  49  *    notice, this list of conditions, and the following disclaimer,
  50  *    without modification.
  51  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  52  *    substantially similar to the "NO WARRANTY" disclaimer below
  53  *    ("Disclaimer") and any redistribution must be conditioned upon
  54  *    including a substantially similar Disclaimer requirement for further
  55  *    binary redistribution.
  56  * 3. Neither the names of the above-listed copyright holders nor the names
  57  *    of any contributors may be used to endorse or promote products derived
  58  *    from this software without specific prior written permission.
  59  *
  60  * Alternatively, this software may be distributed under the terms of the
  61  * GNU General Public License ("GPL") version 2 as published by the Free
  62  * Software Foundation.
  63  *
  64  * NO WARRANTY
  65  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  66  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  67  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  68  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  69  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  70  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  71  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  72  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  73  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  74  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  75  * POSSIBILITY OF SUCH DAMAGES.
  76  *
  77  *---------------------------------------------------------------------------
  78  *
  79  *  Thanks also go to (in alphabetical order) the following:
  80  *
  81  *    Rory Bolt     - Sequencer bug fixes
  82  *    Jay Estabrook - Initial DEC Alpha support
  83  *    Doug Ledford  - Much needed abort/reset bug fixes
  84  *    Kai Makisara  - DMAing of SCBs
  85  *
  86  *  A Boot time option was also added for not resetting the scsi bus.
  87  *
  88  *    Form:  aic7xxx=extended
  89  *           aic7xxx=no_reset
  90  *           aic7xxx=verbose
  91  *
  92  *  Daniel M. Eischen, deischen@iworks.InterWorks.org, 1/23/97
  93  *
  94  *  Id: aic7xxx.c,v 4.1 1997/06/12 08:23:42 deang Exp
  95  */
  96
  97 /*
  98  * Further driver modifications made by Doug Ledford <dledford@redhat.com>
  99  *
 100  * Copyright (c) 1997-1999 Doug Ledford
 101  *
 102  * These changes are released under the same licensing terms as the FreeBSD
 103  * driver written by Justin Gibbs.  Please see his Copyright notice above
 104  * for the exact terms and conditions covering my changes as well as the
 105  * warranty statement.
 106  *
 107  * Modifications made to the aic7xxx.c,v 4.1 driver from Dan Eischen include
 108  * but are not limited to:
 109  *
 110  *  1: Import of the latest FreeBSD sequencer code for this driver
 111  *  2: Modification of kernel code to accommodate different sequencer semantics
 112  *  3: Extensive changes throughout kernel portion of driver to improve
 113  *     abort/reset processing and error hanndling
 114  *  4: Other work contributed by various people on the Internet
 115  *  5: Changes to printk information and verbosity selection code
 116  *  6: General reliability related changes, especially in IRQ management
 117  *  7: Modifications to the default probe/attach order for supported cards
 118  *  8: SMP friendliness has been improved
 119  *
 120  */
 121
 122 #include "aic7xxx_osm.h"
 123 #include "aic7xxx_inline.h"
 124 #include <scsi/scsicam.h>
 125
 126 static struct scsi_transport_template *ahc_linux_transport_template = NULL;
 127
 128 #include <linux/init.h>         /* __setup */
 129 #include <linux/mm.h>           /* For fetching system memory size */
 130 #include <linux/blkdev.h>               /* For block_size() */
 131 #include <linux/delay.h>        /* For ssleep/msleep */
 132
 133
 134 /*
 135  * Set this to the delay in seconds after SCSI bus reset.
 136  * Note, we honor this only for the initial bus reset.
 137  * The scsi error recovery code performs its own bus settle
 138  * delay handling for error recovery actions.
 139  */
 140 #ifdef CONFIG_AIC7XXX_RESET_DELAY_MS
 141 #define AIC7XXX_RESET_DELAY CONFIG_AIC7XXX_RESET_DELAY_MS
 142 #else
 143 #define AIC7XXX_RESET_DELAY 5000
 144 #endif
 145
 146 /*
 147  * Control collection of SCSI transfer statistics for the /proc filesystem.
 148  *
 149  * NOTE: Do NOT enable this when running on kernels version 1.2.x and below.
 150  * NOTE: This does affect performance since it has to maintain statistics.
 151  */
 152 #ifdef CONFIG_AIC7XXX_PROC_STATS
 153 #define AIC7XXX_PROC_STATS
 154 #endif
 155
 156 /*
 157  * To change the default number of tagged transactions allowed per-device,
 158  * add a line to the lilo.conf file like:
 159  * append="aic7xxx=verbose,tag_info:{{32,32,32,32},{32,32,32,32}}"
 160  * which will result in the first four devices on the first two
 161  * controllers being set to a tagged queue depth of 32.
 162  *
 163  * The tag_commands is an array of 16 to allow for wide and twin adapters.
 164  * Twin adapters will use indexes 0-7 for channel 0, and indexes 8-15
 165  * for channel 1.
 166  */
 167 typedef struct {
 168         uint8_t tag_commands[16];       /* Allow for wide/twin adapters. */
 169 } adapter_tag_info_t;
 170
 171 /*
 172  * Modify this as you see fit for your system.
 173  *
 174  * 0                    tagged queuing disabled
 175  * 1 <= n <= 253        n == max tags ever dispatched.
 176  *
 177  * The driver will throttle the number of commands dispatched to a
 178  * device if it returns queue full.  For devices with a fixed maximum
 179  * queue depth, the driver will eventually determine this depth and
 180  * lock it in (a console message is printed to indicate that a lock
 181  * has occurred).  On some devices, queue full is returned for a temporary
 182  * resource shortage.  These devices will return queue full at varying
 183  * depths.  The driver will throttle back when the queue fulls occur and
 184  * attempt to slowly increase the depth over time as the device recovers
 185  * from the resource shortage.
 186  *
 187  * In this example, the first line will disable tagged queueing for all
 188  * the devices on the first probed aic7xxx adapter.
 189  *
 190  * The second line enables tagged queueing with 4 commands/LUN for IDs
 191  * (0, 2-11, 13-15), disables tagged queueing for ID 12, and tells the
 192  * driver to attempt to use up to 64 tags for ID 1.
 193  *
 194  * The third line is the same as the first line.
 195  *
 196  * The fourth line disables tagged queueing for devices 0 and 3.  It
 197  * enables tagged queueing for the other IDs, with 16 commands/LUN
 198  * for IDs 1 and 4, 127 commands/LUN for ID 8, and 4 commands/LUN for
 199  * IDs 2, 5-7, and 9-15.
 200  */
 201
 202 /*
 203  * NOTE: The below structure is for reference only, the actual structure
 204  *       to modify in order to change things is just below this comment block.
 205 adapter_tag_info_t aic7xxx_tag_info[] =
 206 {
 207         {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
 208         {{4, 64, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 0, 4, 4, 4}},
 209         {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
 210         {{0, 16, 4, 0, 16, 4, 4, 4, 127, 4, 4, 4, 4, 4, 4, 4}}
 211 };
 212 */
 213
 214 #ifdef CONFIG_AIC7XXX_CMDS_PER_DEVICE
 215 #define AIC7XXX_CMDS_PER_DEVICE CONFIG_AIC7XXX_CMDS_PER_DEVICE
 216 #else
 217 #define AIC7XXX_CMDS_PER_DEVICE AHC_MAX_QUEUE
 218 #endif
 219
 220 #define AIC7XXX_CONFIGED_TAG_COMMANDS {                                 \
 221         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 222         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 223         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 224         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 225         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 226         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 227         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 228         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE                \
 229 }
 230
 231 /*
 232  * By default, use the number of commands specified by
 233  * the users kernel configuration.
 234  */
 235 static adapter_tag_info_t aic7xxx_tag_info[] =
 236 {
 237         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 238         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 239         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 240         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 241         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 242         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 243         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 244         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 245         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 246         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 247         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 248         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 249         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 250         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 251         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 252         {AIC7XXX_CONFIGED_TAG_COMMANDS}
 253 };
 254
 255 /*
 256  * There should be a specific return value for this in scsi.h, but
 257  * it seems that most drivers ignore it.
 258  */
 259 #define DID_UNDERFLOW   DID_ERROR
 260
 261 void
 262 ahc_print_path(struct ahc_softc *ahc, struct scb *scb)
 263 {
 264         printk("(scsi%d:%c:%d:%d): ",
 265                ahc->platform_data->host->host_no,
 266                scb != NULL ? SCB_GET_CHANNEL(ahc, scb) : 'X',
 267                scb != NULL ? SCB_GET_TARGET(ahc, scb) : -1,
 268                scb != NULL ? SCB_GET_LUN(scb) : -1);
 269 }
 270
 271 /*
 272  * XXX - these options apply unilaterally to _all_ 274x/284x/294x
 273  *       cards in the system.  This should be fixed.  Exceptions to this
 274  *       rule are noted in the comments.
 275  */
 276
 277 /*
 278  * Skip the scsi bus reset.  Non 0 make us skip the reset at startup.  This
 279  * has no effect on any later resets that might occur due to things like
 280  * SCSI bus timeouts.
 281  */
 282 static uint32_t aic7xxx_no_reset;
 283
 284 /*
 285  * Should we force EXTENDED translation on a controller.
 286  *     0 == Use whatever is in the SEEPROM or default to off
 287  *     1 == Use whatever is in the SEEPROM or default to on
 288  */
 289 static uint32_t aic7xxx_extended;
 290
 291 /*
 292  * PCI bus parity checking of the Adaptec controllers.  This is somewhat
 293  * dubious at best.  To my knowledge, this option has never actually
 294  * solved a PCI parity problem, but on certain machines with broken PCI
 295  * chipset configurations where stray PCI transactions with bad parity are
 296  * the norm rather than the exception, the error messages can be overwelming.
 297  * It's included in the driver for completeness.
 298  *   0     = Shut off PCI parity check
 299  *   non-0 = reverse polarity pci parity checking
 300  */
 301 static uint32_t aic7xxx_pci_parity = ~0;
 302
 303 /*
 304  * There are lots of broken chipsets in the world.  Some of them will
 305  * violate the PCI spec when we issue byte sized memory writes to our
 306  * controller.  I/O mapped register access, if allowed by the given
 307  * platform, will work in almost all cases.
 308  */
 309 uint32_t aic7xxx_allow_memio = ~0;
 310
 311 /*
 312  * So that we can set how long each device is given as a selection timeout.
 313  * The table of values goes like this:
 314  *   0 - 256ms
 315  *   1 - 128ms
 316  *   2 - 64ms
 317  *   3 - 32ms
 318  * We default to 256ms because some older devices need a longer time
 319  * to respond to initial selection.
 320  */
 321 static uint32_t aic7xxx_seltime;
 322
 323 /*
 324  * Certain devices do not perform any aging on commands.  Should the
 325  * device be saturated by commands in one portion of the disk, it is
 326  * possible for transactions on far away sectors to never be serviced.
 327  * To handle these devices, we can periodically send an ordered tag to
 328  * force all outstanding transactions to be serviced prior to a new
 329  * transaction.
 330  */
 331 uint32_t aic7xxx_periodic_otag;
 332
 333 /*
 334  * Module information and settable options.
 335  */
 336 static char *aic7xxx = NULL;
 337
 338 MODULE_AUTHOR("Maintainer: Justin T. Gibbs <gibbs@scsiguy.com>");
 339 MODULE_DESCRIPTION("Adaptec Aic77XX/78XX SCSI Host Bus Adapter driver");
 340 MODULE_LICENSE("Dual BSD/GPL");
 341 MODULE_VERSION(AIC7XXX_DRIVER_VERSION);
 342 module_param(aic7xxx, charp, 0444);
 343 MODULE_PARM_DESC(aic7xxx,
 344 "period delimited, options string.\n"
 345 "       verbose                 Enable verbose/diagnostic logging\n"
 346 "       allow_memio             Allow device registers to be memory mapped\n"
 347 "       debug                   Bitmask of debug values to enable\n"
 348 "       no_probe                Toggle EISA/VLB controller probing\n"
 349 "       probe_eisa_vl           Toggle EISA/VLB controller probing\n"
 350 "       no_reset                Supress initial bus resets\n"
 351 "       extended                Enable extended geometry on all controllers\n"
 352 "       periodic_otag           Send an ordered tagged transaction\n"
 353 "                               periodically to prevent tag starvation.\n"
 354 "                               This may be required by some older disk\n"
 355 "                               drives or RAID arrays.\n"
 356 "       reverse_scan            Sort PCI devices highest Bus/Slot to lowest\n"
 357 "       tag_info:<tag_str>      Set per-target tag depth\n"
 358 "       global_tag_depth:<int>  Global tag depth for every target\n"
 359 "                               on every bus\n"
 360 "       seltime:<int>           Selection Timeout\n"
 361 "                               (0/256ms,1/128ms,2/64ms,3/32ms)\n"
 362 "\n"
 363 "       Sample /etc/modprobe.conf line:\n"
 364 "               Toggle EISA/VLB probing\n"
 365 "               Set tag depth on Controller 1/Target 1 to 10 tags\n"
 366 "               Shorten the selection timeout to 128ms\n"
 367 "\n"
 368 "       options aic7xxx 'aic7xxx=probe_eisa_vl.tag_info:{{}.{.10}}.seltime:1'\n"
 369 );
 370
 371 static void ahc_linux_handle_scsi_status(struct ahc_softc *,
 372                                          struct scsi_device *,
 373                                          struct scb *);
 374 static void ahc_linux_queue_cmd_complete(struct ahc_softc *ahc,
 375                                          struct scsi_cmnd *cmd);
 376 static void ahc_linux_sem_timeout(u_long arg);
 377 static void ahc_linux_freeze_simq(struct ahc_softc *ahc);
 378 static void ahc_linux_release_simq(u_long arg);
 379 static int  ahc_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag);
 380 static void ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc);
 381 static u_int ahc_linux_user_tagdepth(struct ahc_softc *ahc,
 382                                      struct ahc_devinfo *devinfo);
 383 static void ahc_linux_device_queue_depth(struct scsi_device *);
 384 static int ahc_linux_run_command(struct ahc_softc*,
 385                                  struct ahc_linux_device *,
 386                                  struct scsi_cmnd *);
 387 static void ahc_linux_setup_tag_info_global(char *p);
 388 static int  aic7xxx_setup(char *s);
 389
 390 static int ahc_linux_unit;
 391
 392
 393 /********************************* Inlines ************************************/
 394 static __inline void ahc_linux_unmap_scb(struct ahc_softc*, struct scb*);
 395
 396 static __inline int ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb,
 397                                       struct ahc_dma_seg *sg,
 398                                       dma_addr_t addr, bus_size_t len);
 399
 400 static __inline void
 401 ahc_linux_unmap_scb(struct ahc_softc *ahc, struct scb *scb)
 402 {
 403         struct scsi_cmnd *cmd;
 404
 405         cmd = scb->io_ctx;
 406         ahc_sync_sglist(ahc, scb, BUS_DMASYNC_POSTWRITE);
 407         if (cmd->use_sg != 0) {
 408                 struct scatterlist *sg;
 409
 410                 sg = (struct scatterlist *)cmd->request_buffer;
 411                 pci_unmap_sg(ahc->dev_softc, sg, cmd->use_sg,
 412                              cmd->sc_data_direction);
 413         } else if (cmd->request_bufflen != 0) {
 414                 pci_unmap_single(ahc->dev_softc,
 415                                  scb->platform_data->buf_busaddr,
 416                                  cmd->request_bufflen,
 417                                  cmd->sc_data_direction);
 418         }
 419 }
 420
 421 static __inline int
 422 ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb,
 423                   struct ahc_dma_seg *sg, dma_addr_t addr, bus_size_t len)
 424 {
 425         int      consumed;
 426
 427         if ((scb->sg_count + 1) > AHC_NSEG)
 428                 panic("Too few segs for dma mapping.  "
 429                       "Increase AHC_NSEG\n");
 430
 431         consumed = 1;
 432         sg->addr = ahc_htole32(addr & 0xFFFFFFFF);
 433         scb->platform_data->xfer_len += len;
 434
 435         if (sizeof(dma_addr_t) > 4
 436          && (ahc->flags & AHC_39BIT_ADDRESSING) != 0)
 437                 len |= (addr >> 8) & AHC_SG_HIGH_ADDR_MASK;
 438
 439         sg->len = ahc_htole32(len);
 440         return (consumed);
 441 }
 442
 443 /*
 444  * Return a string describing the driver.
 445  */
 446 static const char *
 447 ahc_linux_info(struct Scsi_Host *host)
 448 {
 449         static char buffer[512];
 450         char    ahc_info[256];
 451         char   *bp;
 452         struct ahc_softc *ahc;
 453
 454         bp = &buffer[0];
 455         ahc = *(struct ahc_softc **)host->hostdata;
 456         memset(bp, 0, sizeof(buffer));
 457         strcpy(bp, "Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev ");
 458         strcat(bp, AIC7XXX_DRIVER_VERSION);
 459         strcat(bp, "\n");
 460         strcat(bp, "        <");
 461         strcat(bp, ahc->description);
 462         strcat(bp, ">\n");
 463         strcat(bp, "        ");
 464         ahc_controller_info(ahc, ahc_info);
 465         strcat(bp, ahc_info);
 466         strcat(bp, "\n");
 467
 468         return (bp);
 469 }
 470
 471 /*
 472  * Queue an SCB to the controller.
 473  */
 474 static int
 475 ahc_linux_queue(struct scsi_cmnd * cmd, void (*scsi_done) (struct scsi_cmnd *))
 476 {
 477         struct   ahc_softc *ahc;
 478         struct   ahc_linux_device *dev = scsi_transport_device_data(cmd->device);
 479         int rtn = SCSI_MLQUEUE_HOST_BUSY;
 480         unsigned long flags;
 481
 482         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
 483
 484         ahc_lock(ahc, &flags);
 485         if (ahc->platform_data->qfrozen == 0) {
 486                 cmd->scsi_done = scsi_done;
 487                 cmd->result = CAM_REQ_INPROG << 16;
 488                 rtn = ahc_linux_run_command(ahc, dev, cmd);
 489         }
 490         ahc_unlock(ahc, &flags);
 491
 492         return rtn;
 493 }
 494
 495 static inline struct scsi_target **
 496 ahc_linux_target_in_softc(struct scsi_target *starget)
 497 {
 498         struct  ahc_softc *ahc =
 499                 *((struct ahc_softc **)dev_to_shost(&starget->dev)->hostdata);
 500         unsigned int target_offset;
 501
 502         target_offset = starget->id;
 503         if (starget->channel != 0)
 504                 target_offset += 8;
 505
 506         return &ahc->platform_data->starget[target_offset];
 507 }
 508
 509 static int
 510 ahc_linux_target_alloc(struct scsi_target *starget)
 511 {
 512         struct  ahc_softc *ahc =
 513                 *((struct ahc_softc **)dev_to_shost(&starget->dev)->hostdata);
 514         struct seeprom_config *sc = ahc->seep_config;
 515         unsigned long flags;
 516         struct scsi_target **ahc_targp = ahc_linux_target_in_softc(starget);
 517         struct ahc_linux_target *targ = scsi_transport_target_data(starget);
 518         unsigned short scsirate;
 519         struct ahc_devinfo devinfo;
 520         struct ahc_initiator_tinfo *tinfo;
 521         struct ahc_tmode_tstate *tstate;
 522         char channel = starget->channel + 'A';
 523         unsigned int our_id = ahc->our_id;
 524         unsigned int target_offset;
 525
 526         target_offset = starget->id;
 527         if (starget->channel != 0)
 528                 target_offset += 8;
 529
 530         if (starget->channel)
 531                 our_id = ahc->our_id_b;
 532
 533         ahc_lock(ahc, &flags);
 534
 535         BUG_ON(*ahc_targp != NULL);
 536
 537         *ahc_targp = starget;
 538         memset(targ, 0, sizeof(*targ));
 539
 540         if (sc) {
 541                 int maxsync = AHC_SYNCRATE_DT;
 542                 int ultra = 0;
 543                 int flags = sc->device_flags[target_offset];
 544
 545                 if (ahc->flags & AHC_NEWEEPROM_FMT) {
 546                     if (flags & CFSYNCHISULTRA)
 547                         ultra = 1;
 548                 } else if (flags & CFULTRAEN)
 549                         ultra = 1;
 550                 /* AIC nutcase; 10MHz appears as ultra = 1, CFXFER = 0x04
 551                  * change it to ultra=0, CFXFER = 0 */
 552                 if(ultra && (flags & CFXFER) == 0x04) {
 553                         ultra = 0;
 554                         flags &= ~CFXFER;
 555                 }
 556
 557                 if ((ahc->features & AHC_ULTRA2) != 0) {
 558                         scsirate = (flags & CFXFER) | (ultra ? 0x8 : 0);
 559                 } else {
 560                         scsirate = (flags & CFXFER) << 4;
 561                         maxsync = ultra ? AHC_SYNCRATE_ULTRA :
 562                                 AHC_SYNCRATE_FAST;
 563                 }
 564                 spi_max_width(starget) = (flags & CFWIDEB) ? 1 : 0;
 565                 if (!(flags & CFSYNCH))
 566                         spi_max_offset(starget) = 0;
 567                 spi_min_period(starget) =
 568                         ahc_find_period(ahc, scsirate, maxsync);
 569
 570                 tinfo = ahc_fetch_transinfo(ahc, channel, ahc->our_id,
 571                                             starget->id, &tstate);
 572         }
 573         ahc_compile_devinfo(&devinfo, our_id, starget->id,
 574                             CAM_LUN_WILDCARD, channel,
 575                             ROLE_INITIATOR);
 576         ahc_set_syncrate(ahc, &devinfo, NULL, 0, 0, 0,
 577                          AHC_TRANS_GOAL, /*paused*/FALSE);
 578         ahc_set_width(ahc, &devinfo, MSG_EXT_WDTR_BUS_8_BIT,
 579                       AHC_TRANS_GOAL, /*paused*/FALSE);
 580         ahc_unlock(ahc, &flags);
 581
 582         return 0;
 583 }
 584
 585 static void
 586 ahc_linux_target_destroy(struct scsi_target *starget)
 587 {
 588         struct scsi_target **ahc_targp = ahc_linux_target_in_softc(starget);
 589
 590         *ahc_targp = NULL;
 591 }
 592
 593 static int
 594 ahc_linux_slave_alloc(struct scsi_device *sdev)
 595 {
 596         struct  ahc_softc *ahc =
 597                 *((struct ahc_softc **)sdev->host->hostdata);
 598         struct scsi_target *starget = sdev->sdev_target;
 599         struct ahc_linux_target *targ = scsi_transport_target_data(starget);
 600         struct ahc_linux_device *dev;
 601
 602         if (bootverbose)
 603                 printf("%s: Slave Alloc %d\n", ahc_name(ahc), sdev->id);
 604
 605         BUG_ON(targ->sdev[sdev->lun] != NULL);
 606
 607         dev = scsi_transport_device_data(sdev);
 608         memset(dev, 0, sizeof(*dev));
 609
 610         /*
 611          * We start out life using untagged
 612          * transactions of which we allow one.
 613          */
 614         dev->openings = 1;
 615
 616         /*
 617          * Set maxtags to 0.  This will be changed if we
 618          * later determine that we are dealing with
 619          * a tagged queuing capable device.
 620          */
 621         dev->maxtags = 0;
 622
 623         targ->sdev[sdev->lun] = sdev;
 624
 625         spi_period(starget) = 0;
 626
 627         return 0;
 628 }
 629
 630 static int
 631 ahc_linux_slave_configure(struct scsi_device *sdev)
 632 {
 633         struct  ahc_softc *ahc;
 634
 635         ahc = *((struct ahc_softc **)sdev->host->hostdata);
 636
 637         if (bootverbose)
 638                 sdev_printk(KERN_INFO, sdev, "Slave Configure\n");
 639
 640         ahc_linux_device_queue_depth(sdev);
 641
 642         /* Initial Domain Validation */
 643         if (!spi_initial_dv(sdev->sdev_target))
 644                 spi_dv_device(sdev);
 645
 646         return 0;
 647 }
 648
 649 static void
 650 ahc_linux_slave_destroy(struct scsi_device *sdev)
 651 {
 652         struct  ahc_softc *ahc;
 653         struct  ahc_linux_device *dev = scsi_transport_device_data(sdev);
 654         struct  ahc_linux_target *targ = scsi_transport_target_data(sdev->sdev_target);
 655
 656         ahc = *((struct ahc_softc **)sdev->host->hostdata);
 657         if (bootverbose)
 658                 printf("%s: Slave Destroy %d\n", ahc_name(ahc), sdev->id);
 659
 660         BUG_ON(dev->active);
 661
 662         targ->sdev[sdev->lun] = NULL;
 663 }
 664
 665 #if defined(__i386__)
 666 /*
 667  * Return the disk geometry for the given SCSI device.
 668  */
 669 static int
 670 ahc_linux_biosparam(struct scsi_device *sdev, struct block_device *bdev,
 671                     sector_t capacity, int geom[])
 672 {
 673         uint8_t *bh;
 674         int      heads;
 675         int      sectors;
 676         int      cylinders;
 677         int      ret;
 678         int      extended;
 679         struct   ahc_softc *ahc;
 680         u_int    channel;
 681
 682         ahc = *((struct ahc_softc **)sdev->host->hostdata);
 683         channel = sdev_channel(sdev);
 684
 685         bh = scsi_bios_ptable(bdev);
 686         if (bh) {
 687                 ret = scsi_partsize(bh, capacity,
 688                                     &geom[2], &geom[0], &geom[1]);
 689                 kfree(bh);
 690                 if (ret != -1)
 691                         return (ret);
 692         }
 693         heads = 64;
 694         sectors = 32;
 695         cylinders = aic_sector_div(capacity, heads, sectors);
 696
 697         if (aic7xxx_extended != 0)
 698                 extended = 1;
 699         else if (channel == 0)
 700                 extended = (ahc->flags & AHC_EXTENDED_TRANS_A) != 0;
 701         else
 702                 extended = (ahc->flags & AHC_EXTENDED_TRANS_B) != 0;
 703         if (extended && cylinders >= 1024) {
 704                 heads = 255;
 705                 sectors = 63;
 706                 cylinders = aic_sector_div(capacity, heads, sectors);
 707         }
 708         geom[0] = heads;
 709         geom[1] = sectors;
 710         geom[2] = cylinders;
 711         return (0);
 712 }
 713 #endif
 714
 715 /*
 716  * Abort the current SCSI command(s).
 717  */
 718 static int
 719 ahc_linux_abort(struct scsi_cmnd *cmd)
 720 {
 721         int error;
 722
 723         error = ahc_linux_queue_recovery_cmd(cmd, SCB_ABORT);
 724         if (error != 0)
 725                 printf("aic7xxx_abort returns 0x%x\n", error);
 726         return (error);
 727 }
 728
 729 /*
 730  * Attempt to send a target reset message to the device that timed out.
 731  */
 732 static int
 733 ahc_linux_dev_reset(struct scsi_cmnd *cmd)
 734 {
 735         int error;
 736
 737         error = ahc_linux_queue_recovery_cmd(cmd, SCB_DEVICE_RESET);
 738         if (error != 0)
 739                 printf("aic7xxx_dev_reset returns 0x%x\n", error);
 740         return (error);
 741 }
 742
 743 /*
 744  * Reset the SCSI bus.
 745  */
 746 static int
 747 ahc_linux_bus_reset(struct scsi_cmnd *cmd)
 748 {
 749         struct ahc_softc *ahc;
 750         int    found;
 751         unsigned long flags;
 752
 753         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
 754
 755         ahc_lock(ahc, &flags);
 756         found = ahc_reset_channel(ahc, scmd_channel(cmd) + 'A',
 757                                   /*initiate reset*/TRUE);
 758         ahc_unlock(ahc, &flags);
 759
 760         if (bootverbose)
 761                 printf("%s: SCSI bus reset delivered. "
 762                        "%d SCBs aborted.\n", ahc_name(ahc), found);
 763
 764         return SUCCESS;
 765 }
 766
 767 struct scsi_host_template aic7xxx_driver_template = {
 768         .module                 = THIS_MODULE,
 769         .name                   = "aic7xxx",
 770         .proc_name              = "aic7xxx",
 771         .proc_info              = ahc_linux_proc_info,
 772         .info                   = ahc_linux_info,
 773         .queuecommand           = ahc_linux_queue,
 774         .eh_abort_handler       = ahc_linux_abort,
 775         .eh_device_reset_handler = ahc_linux_dev_reset,
 776         .eh_bus_reset_handler   = ahc_linux_bus_reset,
 777 #if defined(__i386__)
 778         .bios_param             = ahc_linux_biosparam,
 779 #endif
 780         .can_queue              = AHC_MAX_QUEUE,
 781         .this_id                = -1,
 782         .cmd_per_lun            = 2,
 783         .use_clustering         = ENABLE_CLUSTERING,
 784         .slave_alloc            = ahc_linux_slave_alloc,
 785         .slave_configure        = ahc_linux_slave_configure,
 786         .slave_destroy          = ahc_linux_slave_destroy,
 787         .target_alloc           = ahc_linux_target_alloc,
 788         .target_destroy         = ahc_linux_target_destroy,
 789 };
 790
 791 /**************************** Tasklet Handler *********************************/
 792
 793 /******************************** Macros **************************************/
 794 #define BUILD_SCSIID(ahc, cmd)                                              \
 795         ((((cmd)->device->id << TID_SHIFT) & TID)                           \
 796         | (((cmd)->device->channel == 0) ? (ahc)->our_id : (ahc)->our_id_b) \
 797         | (((cmd)->device->channel == 0) ? 0 : TWIN_CHNLB))
 798
 799 /******************************** Bus DMA *************************************/
 800 int
 801 ahc_dma_tag_create(struct ahc_softc *ahc, bus_dma_tag_t parent,
 802                    bus_size_t alignment, bus_size_t boundary,
 803                    dma_addr_t lowaddr, dma_addr_t highaddr,
 804                    bus_dma_filter_t *filter, void *filterarg,
 805                    bus_size_t maxsize, int nsegments,
 806                    bus_size_t maxsegsz, int flags, bus_dma_tag_t *ret_tag)
 807 {
 808         bus_dma_tag_t dmat;
 809
 810         dmat = malloc(sizeof(*dmat), M_DEVBUF, M_NOWAIT);
 811         if (dmat == NULL)
 812                 return (ENOMEM);
 813
 814         /*
 815          * Linux is very simplistic about DMA memory.  For now don't
 816          * maintain all specification information.  Once Linux supplies
 817          * better facilities for doing these operations, or the
 818          * needs of this particular driver change, we might need to do
 819          * more here.
 820          */
 821         dmat->alignment = alignment;
 822         dmat->boundary = boundary;
 823         dmat->maxsize = maxsize;
 824         *ret_tag = dmat;
 825         return (0);
 826 }
 827
 828 void
 829 ahc_dma_tag_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat)
 830 {
 831         free(dmat, M_DEVBUF);
 832 }
 833
 834 int
 835 ahc_dmamem_alloc(struct ahc_softc *ahc, bus_dma_tag_t dmat, void** vaddr,
 836                  int flags, bus_dmamap_t *mapp)
 837 {
 838         *vaddr = pci_alloc_consistent(ahc->dev_softc,
 839                                       dmat->maxsize, mapp);
 840         if (*vaddr == NULL)
 841                 return ENOMEM;
 842         return 0;
 843 }
 844
 845 void
 846 ahc_dmamem_free(struct ahc_softc *ahc, bus_dma_tag_t dmat,
 847                 void* vaddr, bus_dmamap_t map)
 848 {
 849         pci_free_consistent(ahc->dev_softc, dmat->maxsize,
 850                             vaddr, map);
 851 }
 852
 853 int
 854 ahc_dmamap_load(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map,
 855                 void *buf, bus_size_t buflen, bus_dmamap_callback_t *cb,
 856                 void *cb_arg, int flags)
 857 {
 858         /*
 859          * Assume for now that this will only be used during
 860          * initialization and not for per-transaction buffer mapping.
 861          */
 862         bus_dma_segment_t stack_sg;
 863
 864         stack_sg.ds_addr = map;
 865         stack_sg.ds_len = dmat->maxsize;
 866         cb(cb_arg, &stack_sg, /*nseg*/1, /*error*/0);
 867         return (0);
 868 }
 869
 870 void
 871 ahc_dmamap_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
 872 {
 873 }
 874
 875 int
 876 ahc_dmamap_unload(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
 877 {
 878         /* Nothing to do */
 879         return (0);
 880 }
 881
 882 static void
 883 ahc_linux_setup_tag_info_global(char *p)
 884 {
 885         int tags, i, j;
 886
 887         tags = simple_strtoul(p + 1, NULL, 0) & 0xff;
 888         printf("Setting Global Tags= %d\n", tags);
 889
 890         for (i = 0; i < NUM_ELEMENTS(aic7xxx_tag_info); i++) {
 891                 for (j = 0; j < AHC_NUM_TARGETS; j++) {
 892                         aic7xxx_tag_info[i].tag_commands[j] = tags;
 893                 }
 894         }
 895 }
 896
 897 static void
 898 ahc_linux_setup_tag_info(u_long arg, int instance, int targ, int32_t value)
 899 {
 900
 901         if ((instance >= 0) && (targ >= 0)
 902          && (instance < NUM_ELEMENTS(aic7xxx_tag_info))
 903          && (targ < AHC_NUM_TARGETS)) {
 904                 aic7xxx_tag_info[instance].tag_commands[targ] = value & 0xff;
 905                 if (bootverbose)
 906                         printf("tag_info[%d:%d] = %d\n", instance, targ, value);
 907         }
 908 }
 909
 910 static char *
 911 ahc_parse_brace_option(char *opt_name, char *opt_arg, char *end, int depth,
 912                        void (*callback)(u_long, int, int, int32_t),
 913                        u_long callback_arg)
 914 {
 915         char    *tok_end;
 916         char    *tok_end2;
 917         int      i;
 918         int      instance;
 919         int      targ;
 920         int      done;
 921         char     tok_list[] = {'.', ',', '{', '}', '\0'};
 922
 923         /* All options use a ':' name/arg separator */
 924         if (*opt_arg != ':')
 925                 return (opt_arg);
 926         opt_arg++;
 927         instance = -1;
 928         targ = -1;
 929         done = FALSE;
 930         /*
 931          * Restore separator that may be in
 932          * the middle of our option argument.
 933          */
 934         tok_end = strchr(opt_arg, '\0');
 935         if (tok_end < end)
 936                 *tok_end = ',';
 937         while (!done) {
 938                 switch (*opt_arg) {
 939                 case '{':
 940                         if (instance == -1) {
 941                                 instance = 0;
 942                         } else {
 943                                 if (depth > 1) {
 944                                         if (targ == -1)
 945                                                 targ = 0;
 946                                 } else {
 947                                         printf("Malformed Option %s\n",
 948                                                opt_name);
 949                                         done = TRUE;
 950                                 }
 951                         }
 952                         opt_arg++;
 953                         break;
 954                 case '}':
 955                         if (targ != -1)
 956                                 targ = -1;
 957                         else if (instance != -1)
 958                                 instance = -1;
 959                         opt_arg++;
 960                         break;
 961                 case ',':
 962                 case '.':
 963                         if (instance == -1)
 964                                 done = TRUE;
 965                         else if (targ >= 0)
 966                                 targ++;
 967                         else if (instance >= 0)
 968                                 instance++;
 969                         opt_arg++;
 970                         break;
 971                 case '\0':
 972                         done = TRUE;
 973                         break;
 974                 default:
 975                         tok_end = end;
 976                         for (i = 0; tok_list[i]; i++) {
 977                                 tok_end2 = strchr(opt_arg, tok_list[i]);
 978                                 if ((tok_end2) && (tok_end2 < tok_end))
 979                                         tok_end = tok_end2;
 980                         }
 981                         callback(callback_arg, instance, targ,
 982                                  simple_strtol(opt_arg, NULL, 0));
 983                         opt_arg = tok_end;
 984                         break;
 985                 }
 986         }
 987         return (opt_arg);
 988 }
 989
 990 /*
 991  * Handle Linux boot parameters. This routine allows for assigning a value
 992  * to a parameter with a ':' between the parameter and the value.
 993  * ie. aic7xxx=stpwlev:1,extended
 994  */
 995 static int
 996 aic7xxx_setup(char *s)
 997 {
 998         int     i, n;
 999         char   *p;
1000         char   *end;
1001
1002         static struct {
1003                 const char *name;
1004                 uint32_t *flag;
1005         } options[] = {
1006                 { "extended", &aic7xxx_extended },
1007                 { "no_reset", &aic7xxx_no_reset },
1008                 { "verbose", &aic7xxx_verbose },
1009                 { "allow_memio", &aic7xxx_allow_memio},
1010 #ifdef AHC_DEBUG
1011                 { "debug", &ahc_debug },
1012 #endif
1013                 { "periodic_otag", &aic7xxx_periodic_otag },
1014                 { "pci_parity", &aic7xxx_pci_parity },
1015                 { "seltime", &aic7xxx_seltime },
1016                 { "tag_info", NULL },
1017                 { "global_tag_depth", NULL },
1018                 { "dv", NULL }
1019         };
1020
1021         end = strchr(s, '\0');
1022
1023         /*
1024          * XXX ia64 gcc isn't smart enough to know that NUM_ELEMENTS
1025          * will never be 0 in this case.
1026          */
1027         n = 0;
1028
1029         while ((p = strsep(&s, ",.")) != NULL) {
1030                 if (*p == '\0')
1031                         continue;
1032                 for (i = 0; i < NUM_ELEMENTS(options); i++) {
1033
1034                         n = strlen(options[i].name);
1035                         if (strncmp(options[i].name, p, n) == 0)
1036                                 break;
1037                 }
1038                 if (i == NUM_ELEMENTS(options))
1039                         continue;
1040
1041                 if (strncmp(p, "global_tag_depth", n) == 0) {
1042                         ahc_linux_setup_tag_info_global(p + n);
1043                 } else if (strncmp(p, "tag_info", n) == 0) {
1044                         s = ahc_parse_brace_option("tag_info", p + n, end,
1045                             2, ahc_linux_setup_tag_info, 0);
1046                 } else if (p[n] == ':') {
1047                         *(options[i].flag) = simple_strtoul(p + n + 1, NULL, 0);
1048                 } else if (strncmp(p, "verbose", n) == 0) {
1049                         *(options[i].flag) = 1;
1050                 } else {
1051                         *(options[i].flag) ^= 0xFFFFFFFF;
1052                 }
1053         }
1054         return 1;
1055 }
1056
1057 __setup("aic7xxx=", aic7xxx_setup);
1058
1059 uint32_t aic7xxx_verbose;
1060
1061 int
1062 ahc_linux_register_host(struct ahc_softc *ahc, struct scsi_host_template *template)
1063 {
1064         char    buf[80];
1065         struct  Scsi_Host *host;
1066         char    *new_name;
1067         u_long  s;
1068         int     retval;
1069
1070         template->name = ahc->description;
1071         host = scsi_host_alloc(template, sizeof(struct ahc_softc *));
1072         if (host == NULL)
1073                 return (ENOMEM);
1074
1075         *((struct ahc_softc **)host->hostdata) = ahc;
1076         ahc_lock(ahc, &s);
1077         ahc->platform_data->host = host;
1078         host->can_queue = AHC_MAX_QUEUE;
1079         host->cmd_per_lun = 2;
1080         /* XXX No way to communicate the ID for multiple channels */
1081         host->this_id = ahc->our_id;
1082         host->irq = ahc->platform_data->irq;
1083         host->max_id = (ahc->features & AHC_WIDE) ? 16 : 8;
1084         host->max_lun = AHC_NUM_LUNS;
1085         host->max_channel = (ahc->features & AHC_TWIN) ? 1 : 0;
1086         host->sg_tablesize = AHC_NSEG;
1087         ahc_set_unit(ahc, ahc_linux_unit++);
1088         sprintf(buf, "scsi%d", host->host_no);
1089         new_name = malloc(strlen(buf) + 1, M_DEVBUF, M_NOWAIT);
1090         if (new_name != NULL) {
1091                 strcpy(new_name, buf);
1092                 ahc_set_name(ahc, new_name);
1093         }
1094         host->unique_id = ahc->unit;
1095         ahc_linux_initialize_scsi_bus(ahc);
1096         ahc_intr_enable(ahc, TRUE);
1097         ahc_unlock(ahc, &s);
1098
1099         host->transportt = ahc_linux_transport_template;
1100
1101         retval = scsi_add_host(host,
1102                         (ahc->dev_softc ? &ahc->dev_softc->dev : NULL));
1103         if (retval) {
1104                 printk(KERN_WARNING "aic7xxx: scsi_add_host failed\n");
1105                 scsi_host_put(host);
1106                 return retval;
1107         }
1108
1109         scsi_scan_host(host);
1110         return 0;
1111 }
1112
1113 /*
1114  * Place the SCSI bus into a known state by either resetting it,
1115  * or forcing transfer negotiations on the next command to any
1116  * target.
1117  */
1118 void
1119 ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc)
1120 {
1121         int i;
1122         int numtarg;
1123
1124         i = 0;
1125         numtarg = 0;
1126
1127         if (aic7xxx_no_reset != 0)
1128                 ahc->flags &= ~(AHC_RESET_BUS_A|AHC_RESET_BUS_B);
1129
1130         if ((ahc->flags & AHC_RESET_BUS_A) != 0)
1131                 ahc_reset_channel(ahc, 'A', /*initiate_reset*/TRUE);
1132         else
1133                 numtarg = (ahc->features & AHC_WIDE) ? 16 : 8;
1134
1135         if ((ahc->features & AHC_TWIN) != 0) {
1136
1137                 if ((ahc->flags & AHC_RESET_BUS_B) != 0) {
1138                         ahc_reset_channel(ahc, 'B', /*initiate_reset*/TRUE);
1139                 } else {
1140                         if (numtarg == 0)
1141                                 i = 8;
1142                         numtarg += 8;
1143                 }
1144         }
1145
1146         /*
1147          * Force negotiation to async for all targets that
1148          * will not see an initial bus reset.
1149          */
1150         for (; i < numtarg; i++) {
1151                 struct ahc_devinfo devinfo;
1152                 struct ahc_initiator_tinfo *tinfo;
1153                 struct ahc_tmode_tstate *tstate;
1154                 u_int our_id;
1155                 u_int target_id;
1156                 char channel;
1157
1158                 channel = 'A';
1159                 our_id = ahc->our_id;
1160                 target_id = i;
1161                 if (i > 7 && (ahc->features & AHC_TWIN) != 0) {
1162                         channel = 'B';
1163                         our_id = ahc->our_id_b;
1164                         target_id = i % 8;
1165                 }
1166                 tinfo = ahc_fetch_transinfo(ahc, channel, our_id,
1167                                             target_id, &tstate);
1168                 ahc_compile_devinfo(&devinfo, our_id, target_id,
1169                                     CAM_LUN_WILDCARD, channel, ROLE_INITIATOR);
1170                 ahc_update_neg_request(ahc, &devinfo, tstate,
1171                                        tinfo, AHC_NEG_ALWAYS);
1172         }
1173         /* Give the bus some time to recover */
1174         if ((ahc->flags & (AHC_RESET_BUS_A|AHC_RESET_BUS_B)) != 0) {
1175                 ahc_linux_freeze_simq(ahc);
1176                 init_timer(&ahc->platform_data->reset_timer);
1177                 ahc->platform_data->reset_timer.data = (u_long)ahc;
1178                 ahc->platform_data->reset_timer.expires =
1179                     jiffies + (AIC7XXX_RESET_DELAY * HZ)/1000;
1180                 ahc->platform_data->reset_timer.function =
1181                     ahc_linux_release_simq;
1182                 add_timer(&ahc->platform_data->reset_timer);
1183         }
1184 }
1185
1186 int
1187 ahc_platform_alloc(struct ahc_softc *ahc, void *platform_arg)
1188 {
1189
1190         ahc->platform_data =
1191             malloc(sizeof(struct ahc_platform_data), M_DEVBUF, M_NOWAIT);
1192         if (ahc->platform_data == NULL)
1193                 return (ENOMEM);
1194         memset(ahc->platform_data, 0, sizeof(struct ahc_platform_data));
1195         ahc->platform_data->irq = AHC_LINUX_NOIRQ;
1196         ahc_lockinit(ahc);
1197         init_MUTEX_LOCKED(&ahc->platform_data->eh_sem);
1198         ahc->seltime = (aic7xxx_seltime & 0x3) << 4;
1199         ahc->seltime_b = (aic7xxx_seltime & 0x3) << 4;
1200         if (aic7xxx_pci_parity == 0)
1201                 ahc->flags |= AHC_DISABLE_PCI_PERR;
1202
1203         return (0);
1204 }
1205
1206 void
1207 ahc_platform_free(struct ahc_softc *ahc)
1208 {
1209         struct scsi_target *starget;
1210         int i, j;
1211
1212         if (ahc->platform_data != NULL) {
1213                 /* destroy all of the device and target objects */
1214                 for (i = 0; i < AHC_NUM_TARGETS; i++) {
1215                         starget = ahc->platform_data->starget[i];
1216                         if (starget != NULL) {
1217                                 for (j = 0; j < AHC_NUM_LUNS; j++) {
1218                                         struct ahc_linux_target *targ =
1219                                                 scsi_transport_target_data(starget);
1220
1221                                         if (targ->sdev[j] == NULL)
1222                                                 continue;
1223                                         targ->sdev[j] = NULL;
1224                                 }
1225                                 ahc->platform_data->starget[i] = NULL;
1226                         }
1227                 }
1228
1229                 if (ahc->platform_data->irq != AHC_LINUX_NOIRQ)
1230                         free_irq(ahc->platform_data->irq, ahc);
1231                 if (ahc->tag == BUS_SPACE_PIO
1232                  && ahc->bsh.ioport != 0)
1233                         release_region(ahc->bsh.ioport, 256);
1234                 if (ahc->tag == BUS_SPACE_MEMIO
1235                  && ahc->bsh.maddr != NULL) {
1236                         iounmap(ahc->bsh.maddr);
1237                         release_mem_region(ahc->platform_data->mem_busaddr,
1238                                            0x1000);
1239                 }
1240
1241                 if (ahc->platform_data->host)
1242                         scsi_host_put(ahc->platform_data->host);
1243
1244                 free(ahc->platform_data, M_DEVBUF);
1245         }
1246 }
1247
1248 void
1249 ahc_platform_freeze_devq(struct ahc_softc *ahc, struct scb *scb)
1250 {
1251         ahc_platform_abort_scbs(ahc, SCB_GET_TARGET(ahc, scb),
1252                                 SCB_GET_CHANNEL(ahc, scb),
1253                                 SCB_GET_LUN(scb), SCB_LIST_NULL,
1254                                 ROLE_UNKNOWN, CAM_REQUEUE_REQ);
1255 }
1256
1257 void
1258 ahc_platform_set_tags(struct ahc_softc *ahc, struct ahc_devinfo *devinfo,
1259                       ahc_queue_alg alg)
1260 {
1261         struct scsi_target *starget;
1262         struct ahc_linux_target *targ;
1263         struct ahc_linux_device *dev;
1264         struct scsi_device *sdev;
1265         u_int target_offset;
1266         int was_queuing;
1267         int now_queuing;
1268
1269         target_offset = devinfo->target;
1270         if (devinfo->channel != 'A')
1271                 target_offset += 8;
1272         starget = ahc->platform_data->starget[target_offset];
1273         targ = scsi_transport_target_data(starget);
1274         BUG_ON(targ == NULL);
1275         sdev = targ->sdev[devinfo->lun];
1276         if (sdev == NULL)
1277                 return;
1278         dev = scsi_transport_device_data(sdev);
1279
1280         was_queuing = dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED);
1281         switch (alg) {
1282         default:
1283         case AHC_QUEUE_NONE:
1284                 now_queuing = 0;
1285                 break;
1286         case AHC_QUEUE_BASIC:
1287                 now_queuing = AHC_DEV_Q_BASIC;
1288                 break;
1289         case AHC_QUEUE_TAGGED:
1290                 now_queuing = AHC_DEV_Q_TAGGED;
1291                 break;
1292         }
1293         if ((dev->flags & AHC_DEV_FREEZE_TIL_EMPTY) == 0
1294          && (was_queuing != now_queuing)
1295          && (dev->active != 0)) {
1296                 dev->flags |= AHC_DEV_FREEZE_TIL_EMPTY;
1297                 dev->qfrozen++;
1298         }
1299
1300         dev->flags &= ~(AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED|AHC_DEV_PERIODIC_OTAG);
1301         if (now_queuing) {
1302                 u_int usertags;
1303
1304                 usertags = ahc_linux_user_tagdepth(ahc, 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 == AHC_QUEUE_TAGGED) {
1320                         dev->flags |= AHC_DEV_Q_TAGGED;
1321                         if (aic7xxx_periodic_otag != 0)
1322                                 dev->flags |= AHC_DEV_PERIODIC_OTAG;
1323                 } else
1324                         dev->flags |= AHC_DEV_Q_BASIC;
1325         } else {
1326                 /* We can only have one opening. */
1327                 dev->maxtags = 0;
1328                 dev->openings =  1 - dev->active;
1329         }
1330         switch ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED))) {
1331         case AHC_DEV_Q_BASIC:
1332                 scsi_set_tag_type(sdev, MSG_SIMPLE_TAG);
1333                 scsi_activate_tcq(sdev, dev->openings + dev->active);
1334                 break;
1335         case AHC_DEV_Q_TAGGED:
1336                 scsi_set_tag_type(sdev, MSG_ORDERED_TAG);
1337                 scsi_activate_tcq(sdev, dev->openings + dev->active);
1338                 break;
1339         default:
1340                 /*
1341                  * We allow the OS to queue 2 untagged transactions to
1342                  * us at any time even though we can only execute them
1343                  * serially on the controller/device.  This should
1344                  * remove some latency.
1345                  */
1346                 scsi_deactivate_tcq(sdev, 2);
1347                 break;
1348         }
1349 }
1350
1351 int
1352 ahc_platform_abort_scbs(struct ahc_softc *ahc, int target, char channel,
1353                         int lun, u_int tag, role_t role, uint32_t status)
1354 {
1355         return 0;
1356 }
1357
1358 static u_int
1359 ahc_linux_user_tagdepth(struct ahc_softc *ahc, struct ahc_devinfo *devinfo)
1360 {
1361         static int warned_user;
1362         u_int tags;
1363
1364         tags = 0;
1365         if ((ahc->user_discenable & devinfo->target_mask) != 0) {
1366                 if (ahc->unit >= NUM_ELEMENTS(aic7xxx_tag_info)) {
1367                         if (warned_user == 0) {
1368
1369                                 printf(KERN_WARNING
1370 "aic7xxx: WARNING: Insufficient tag_info instances\n"
1371 "aic7xxx: for installed controllers. Using defaults\n"
1372 "aic7xxx: Please update the aic7xxx_tag_info array in\n"
1373 "aic7xxx: the aic7xxx_osm..c source file.\n");
1374                                 warned_user++;
1375                         }
1376                         tags = AHC_MAX_QUEUE;
1377                 } else {
1378                         adapter_tag_info_t *tag_info;
1379
1380                         tag_info = &aic7xxx_tag_info[ahc->unit];
1381                         tags = tag_info->tag_commands[devinfo->target_offset];
1382                         if (tags > AHC_MAX_QUEUE)
1383                                 tags = AHC_MAX_QUEUE;
1384                 }
1385         }
1386         return (tags);
1387 }
1388
1389 /*
1390  * Determines the queue depth for a given device.
1391  */
1392 static void
1393 ahc_linux_device_queue_depth(struct scsi_device *sdev)
1394 {
1395         struct  ahc_devinfo devinfo;
1396         u_int   tags;
1397         struct ahc_softc *ahc = *((struct ahc_softc **)sdev->host->hostdata);
1398
1399         ahc_compile_devinfo(&devinfo,
1400                             sdev->sdev_target->channel == 0
1401                           ? ahc->our_id : ahc->our_id_b,
1402                             sdev->sdev_target->id, sdev->lun,
1403                             sdev->sdev_target->channel == 0 ? 'A' : 'B',
1404                             ROLE_INITIATOR);
1405         tags = ahc_linux_user_tagdepth(ahc, &devinfo);
1406         if (tags != 0 && sdev->tagged_supported != 0) {
1407
1408                 ahc_set_tags(ahc, &devinfo, AHC_QUEUE_TAGGED);
1409                 ahc_print_devinfo(ahc, &devinfo);
1410                 printf("Tagged Queuing enabled.  Depth %d\n", tags);
1411         } else {
1412                 ahc_set_tags(ahc, &devinfo, AHC_QUEUE_NONE);
1413         }
1414 }
1415
1416 static int
1417 ahc_linux_run_command(struct ahc_softc *ahc, struct ahc_linux_device *dev,
1418                       struct scsi_cmnd *cmd)
1419 {
1420         struct   scb *scb;
1421         struct   hardware_scb *hscb;
1422         struct   ahc_initiator_tinfo *tinfo;
1423         struct   ahc_tmode_tstate *tstate;
1424         uint16_t mask;
1425         struct scb_tailq *untagged_q = NULL;
1426
1427         /*
1428          * Schedule us to run later.  The only reason we are not
1429          * running is because the whole controller Q is frozen.
1430          */
1431         if (ahc->platform_data->qfrozen != 0)
1432                 return SCSI_MLQUEUE_HOST_BUSY;
1433
1434         /*
1435          * We only allow one untagged transaction
1436          * per target in the initiator role unless
1437          * we are storing a full busy target *lun*
1438          * table in SCB space.
1439          */
1440         if (!blk_rq_tagged(cmd->request)
1441             && (ahc->features & AHC_SCB_BTT) == 0) {
1442                 int target_offset;
1443
1444                 target_offset = cmd->device->id + cmd->device->channel * 8;
1445                 untagged_q = &(ahc->untagged_queues[target_offset]);
1446                 if (!TAILQ_EMPTY(untagged_q))
1447                         /* if we're already executing an untagged command
1448                          * we're busy to another */
1449                         return SCSI_MLQUEUE_DEVICE_BUSY;
1450         }
1451
1452         /*
1453          * Get an scb to use.
1454          */
1455         scb = ahc_get_scb(ahc);
1456         if (!scb)
1457                 return SCSI_MLQUEUE_HOST_BUSY;
1458
1459         scb->io_ctx = cmd;
1460         scb->platform_data->dev = dev;
1461         hscb = scb->hscb;
1462         cmd->host_scribble = (char *)scb;
1463
1464         /*
1465          * Fill out basics of the HSCB.
1466          */
1467         hscb->control = 0;
1468         hscb->scsiid = BUILD_SCSIID(ahc, cmd);
1469         hscb->lun = cmd->device->lun;
1470         mask = SCB_GET_TARGET_MASK(ahc, scb);
1471         tinfo = ahc_fetch_transinfo(ahc, SCB_GET_CHANNEL(ahc, scb),
1472                                     SCB_GET_OUR_ID(scb),
1473                                     SCB_GET_TARGET(ahc, scb), &tstate);
1474         hscb->scsirate = tinfo->scsirate;
1475         hscb->scsioffset = tinfo->curr.offset;
1476         if ((tstate->ultraenb & mask) != 0)
1477                 hscb->control |= ULTRAENB;
1478
1479         if ((ahc->user_discenable & mask) != 0)
1480                 hscb->control |= DISCENB;
1481
1482         if ((tstate->auto_negotiate & mask) != 0) {
1483                 scb->flags |= SCB_AUTO_NEGOTIATE;
1484                 scb->hscb->control |= MK_MESSAGE;
1485         }
1486
1487         if ((dev->flags & (AHC_DEV_Q_TAGGED|AHC_DEV_Q_BASIC)) != 0) {
1488                 int     msg_bytes;
1489                 uint8_t tag_msgs[2];
1490
1491                 msg_bytes = scsi_populate_tag_msg(cmd, tag_msgs);
1492                 if (msg_bytes && tag_msgs[0] != MSG_SIMPLE_TASK) {
1493                         hscb->control |= tag_msgs[0];
1494                         if (tag_msgs[0] == MSG_ORDERED_TASK)
1495                                 dev->commands_since_idle_or_otag = 0;
1496                 } else if (dev->commands_since_idle_or_otag == AHC_OTAG_THRESH
1497                                 && (dev->flags & AHC_DEV_Q_TAGGED) != 0) {
1498                         hscb->control |= MSG_ORDERED_TASK;
1499                         dev->commands_since_idle_or_otag = 0;
1500                 } else {
1501                         hscb->control |= MSG_SIMPLE_TASK;
1502                 }
1503         }
1504
1505         hscb->cdb_len = cmd->cmd_len;
1506         if (hscb->cdb_len <= 12) {
1507                 memcpy(hscb->shared_data.cdb, cmd->cmnd, hscb->cdb_len);
1508         } else {
1509                 memcpy(hscb->cdb32, cmd->cmnd, hscb->cdb_len);
1510                 scb->flags |= SCB_CDB32_PTR;
1511         }
1512
1513         scb->platform_data->xfer_len = 0;
1514         ahc_set_residual(scb, 0);
1515         ahc_set_sense_residual(scb, 0);
1516         scb->sg_count = 0;
1517         if (cmd->use_sg != 0) {
1518                 struct  ahc_dma_seg *sg;
1519                 struct  scatterlist *cur_seg;
1520                 struct  scatterlist *end_seg;
1521                 int     nseg;
1522
1523                 cur_seg = (struct scatterlist *)cmd->request_buffer;
1524                 nseg = pci_map_sg(ahc->dev_softc, cur_seg, cmd->use_sg,
1525                                   cmd->sc_data_direction);
1526                 end_seg = cur_seg + nseg;
1527                 /* Copy the segments into the SG list. */
1528                 sg = scb->sg_list;
1529                 /*
1530                  * The sg_count may be larger than nseg if
1531                  * a transfer crosses a 32bit page.
1532                  */
1533                 while (cur_seg < end_seg) {
1534                         dma_addr_t addr;
1535                         bus_size_t len;
1536                         int consumed;
1537
1538                         addr = sg_dma_address(cur_seg);
1539                         len = sg_dma_len(cur_seg);
1540                         consumed = ahc_linux_map_seg(ahc, scb,
1541                                                      sg, addr, len);
1542                         sg += consumed;
1543                         scb->sg_count += consumed;
1544                         cur_seg++;
1545                 }
1546                 sg--;
1547                 sg->len |= ahc_htole32(AHC_DMA_LAST_SEG);
1548
1549                 /*
1550                  * Reset the sg list pointer.
1551                  */
1552                 scb->hscb->sgptr =
1553                         ahc_htole32(scb->sg_list_phys | SG_FULL_RESID);
1554
1555                 /*
1556                  * Copy the first SG into the "current"
1557                  * data pointer area.
1558                  */
1559                 scb->hscb->dataptr = scb->sg_list->addr;
1560                 scb->hscb->datacnt = scb->sg_list->len;
1561         } else if (cmd->request_bufflen != 0) {
1562                 struct   ahc_dma_seg *sg;
1563                 dma_addr_t addr;
1564
1565                 sg = scb->sg_list;
1566                 addr = pci_map_single(ahc->dev_softc,
1567                                       cmd->request_buffer,
1568                                       cmd->request_bufflen,
1569                                       cmd->sc_data_direction);
1570                 scb->platform_data->buf_busaddr = addr;
1571                 scb->sg_count = ahc_linux_map_seg(ahc, scb,
1572                                                   sg, addr,
1573                                                   cmd->request_bufflen);
1574                 sg->len |= ahc_htole32(AHC_DMA_LAST_SEG);
1575
1576                 /*
1577                  * Reset the sg list pointer.
1578                  */
1579                 scb->hscb->sgptr =
1580                         ahc_htole32(scb->sg_list_phys | SG_FULL_RESID);
1581
1582                 /*
1583                  * Copy the first SG into the "current"
1584                  * data pointer area.
1585                  */
1586                 scb->hscb->dataptr = sg->addr;
1587                 scb->hscb->datacnt = sg->len;
1588         } else {
1589                 scb->hscb->sgptr = ahc_htole32(SG_LIST_NULL);
1590                 scb->hscb->dataptr = 0;
1591                 scb->hscb->datacnt = 0;
1592                 scb->sg_count = 0;
1593         }
1594
1595         LIST_INSERT_HEAD(&ahc->pending_scbs, scb, pending_links);
1596         dev->openings--;
1597         dev->active++;
1598         dev->commands_issued++;
1599         if ((dev->flags & AHC_DEV_PERIODIC_OTAG) != 0)
1600                 dev->commands_since_idle_or_otag++;
1601
1602         scb->flags |= SCB_ACTIVE;
1603         if (untagged_q) {
1604                 TAILQ_INSERT_TAIL(untagged_q, scb, links.tqe);
1605                 scb->flags |= SCB_UNTAGGEDQ;
1606         }
1607         ahc_queue_scb(ahc, scb);
1608         return 0;
1609 }
1610
1611 /*
1612  * SCSI controller interrupt handler.
1613  */
1614 irqreturn_t
1615 ahc_linux_isr(int irq, void *dev_id, struct pt_regs * regs)
1616 {
1617         struct  ahc_softc *ahc;
1618         u_long  flags;
1619         int     ours;
1620
1621         ahc = (struct ahc_softc *) dev_id;
1622         ahc_lock(ahc, &flags);
1623         ours = ahc_intr(ahc);
1624         ahc_unlock(ahc, &flags);
1625         return IRQ_RETVAL(ours);
1626 }
1627
1628 void
1629 ahc_platform_flushwork(struct ahc_softc *ahc)
1630 {
1631
1632 }
1633
1634 void
1635 ahc_send_async(struct ahc_softc *ahc, char channel,
1636                u_int target, u_int lun, ac_code code, void *arg)
1637 {
1638         switch (code) {
1639         case AC_TRANSFER_NEG:
1640         {
1641                 char    buf[80];
1642                 struct  scsi_target *starget;
1643                 struct  ahc_linux_target *targ;
1644                 struct  info_str info;
1645                 struct  ahc_initiator_tinfo *tinfo;
1646                 struct  ahc_tmode_tstate *tstate;
1647                 int     target_offset;
1648                 unsigned int target_ppr_options;
1649
1650                 BUG_ON(target == CAM_TARGET_WILDCARD);
1651
1652                 info.buffer = buf;
1653                 info.length = sizeof(buf);
1654                 info.offset = 0;
1655                 info.pos = 0;
1656                 tinfo = ahc_fetch_transinfo(ahc, channel,
1657                                                 channel == 'A' ? ahc->our_id
1658                                                                : ahc->our_id_b,
1659                                                 target, &tstate);
1660
1661                 /*
1662                  * Don't bother reporting results while
1663                  * negotiations are still pending.
1664                  */
1665                 if (tinfo->curr.period != tinfo->goal.period
1666                  || tinfo->curr.width != tinfo->goal.width
1667                  || tinfo->curr.offset != tinfo->goal.offset
1668                  || tinfo->curr.ppr_options != tinfo->goal.ppr_options)
1669                         if (bootverbose == 0)
1670                                 break;
1671
1672                 /*
1673                  * Don't bother reporting results that
1674                  * are identical to those last reported.
1675                  */
1676                 target_offset = target;
1677                 if (channel == 'B')
1678                         target_offset += 8;
1679                 starget = ahc->platform_data->starget[target_offset];
1680                 if (starget == NULL)
1681                         break;
1682                 targ = scsi_transport_target_data(starget);
1683
1684                 target_ppr_options =
1685                         (spi_dt(starget) ? MSG_EXT_PPR_DT_REQ : 0)
1686                         + (spi_qas(starget) ? MSG_EXT_PPR_QAS_REQ : 0)
1687                         + (spi_iu(starget) ?  MSG_EXT_PPR_IU_REQ : 0);
1688
1689                 if (tinfo->curr.period == spi_period(starget)
1690                     && tinfo->curr.width == spi_width(starget)
1691                     && tinfo->curr.offset == spi_offset(starget)
1692                  && tinfo->curr.ppr_options == target_ppr_options)
1693                         if (bootverbose == 0)
1694                                 break;
1695
1696                 spi_period(starget) = tinfo->curr.period;
1697                 spi_width(starget) = tinfo->curr.width;
1698                 spi_offset(starget) = tinfo->curr.offset;
1699                 spi_dt(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_DT_REQ ? 1 : 0;
1700                 spi_qas(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_QAS_REQ ? 1 : 0;
1701                 spi_iu(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ ? 1 : 0;
1702                 spi_display_xfer_agreement(starget);
1703                 break;
1704         }
1705         case AC_SENT_BDR:
1706         {
1707                 WARN_ON(lun != CAM_LUN_WILDCARD);
1708                 scsi_report_device_reset(ahc->platform_data->host,
1709                                          channel - 'A', target);
1710                 break;
1711         }
1712         case AC_BUS_RESET:
1713                 if (ahc->platform_data->host != NULL) {
1714                         scsi_report_bus_reset(ahc->platform_data->host,
1715                                               channel - 'A');
1716                 }
1717                 break;
1718         default:
1719                 panic("ahc_send_async: Unexpected async event");
1720         }
1721 }
1722
1723 /*
1724  * Calls the higher level scsi done function and frees the scb.
1725  */
1726 void
1727 ahc_done(struct ahc_softc *ahc, struct scb *scb)
1728 {
1729         struct scsi_cmnd *cmd;
1730         struct     ahc_linux_device *dev;
1731
1732         LIST_REMOVE(scb, pending_links);
1733         if ((scb->flags & SCB_UNTAGGEDQ) != 0) {
1734                 struct scb_tailq *untagged_q;
1735                 int target_offset;
1736
1737                 target_offset = SCB_GET_TARGET_OFFSET(ahc, scb);
1738                 untagged_q = &(ahc->untagged_queues[target_offset]);
1739                 TAILQ_REMOVE(untagged_q, scb, links.tqe);
1740                 BUG_ON(!TAILQ_EMPTY(untagged_q));
1741         }
1742
1743         if ((scb->flags & SCB_ACTIVE) == 0) {
1744                 printf("SCB %d done'd twice\n", scb->hscb->tag);
1745                 ahc_dump_card_state(ahc);
1746                 panic("Stopping for safety");
1747         }
1748         cmd = scb->io_ctx;
1749         dev = scb->platform_data->dev;
1750         dev->active--;
1751         dev->openings++;
1752         if ((cmd->result & (CAM_DEV_QFRZN << 16)) != 0) {
1753                 cmd->result &= ~(CAM_DEV_QFRZN << 16);
1754                 dev->qfrozen--;
1755         }
1756         ahc_linux_unmap_scb(ahc, scb);
1757
1758         /*
1759          * Guard against stale sense data.
1760          * The Linux mid-layer assumes that sense
1761          * was retrieved anytime the first byte of
1762          * the sense buffer looks "sane".
1763          */
1764         cmd->sense_buffer[0] = 0;
1765         if (ahc_get_transaction_status(scb) == CAM_REQ_INPROG) {
1766                 uint32_t amount_xferred;
1767
1768                 amount_xferred =
1769                     ahc_get_transfer_length(scb) - ahc_get_residual(scb);
1770                 if ((scb->flags & SCB_TRANSMISSION_ERROR) != 0) {
1771 #ifdef AHC_DEBUG
1772                         if ((ahc_debug & AHC_SHOW_MISC) != 0) {
1773                                 ahc_print_path(ahc, scb);
1774                                 printf("Set CAM_UNCOR_PARITY\n");
1775                         }
1776 #endif
1777                         ahc_set_transaction_status(scb, CAM_UNCOR_PARITY);
1778 #ifdef AHC_REPORT_UNDERFLOWS
1779                 /*
1780                  * This code is disabled by default as some
1781                  * clients of the SCSI system do not properly
1782                  * initialize the underflow parameter.  This
1783                  * results in spurious termination of commands
1784                  * that complete as expected (e.g. underflow is
1785                  * allowed as command can return variable amounts
1786                  * of data.
1787                  */
1788                 } else if (amount_xferred < scb->io_ctx->underflow) {
1789                         u_int i;
1790
1791                         ahc_print_path(ahc, scb);
1792                         printf("CDB:");
1793                         for (i = 0; i < scb->io_ctx->cmd_len; i++)
1794                                 printf(" 0x%x", scb->io_ctx->cmnd[i]);
1795                         printf("\n");
1796                         ahc_print_path(ahc, scb);
1797                         printf("Saw underflow (%ld of %ld bytes). "
1798                                "Treated as error\n",
1799                                 ahc_get_residual(scb),
1800                                 ahc_get_transfer_length(scb));
1801                         ahc_set_transaction_status(scb, CAM_DATA_RUN_ERR);
1802 #endif
1803                 } else {
1804                         ahc_set_transaction_status(scb, CAM_REQ_CMP);
1805                 }
1806         } else if (ahc_get_transaction_status(scb) == CAM_SCSI_STATUS_ERROR) {
1807                 ahc_linux_handle_scsi_status(ahc, cmd->device, scb);
1808         }
1809
1810         if (dev->openings == 1
1811          && ahc_get_transaction_status(scb) == CAM_REQ_CMP
1812          && ahc_get_scsi_status(scb) != SCSI_STATUS_QUEUE_FULL)
1813                 dev->tag_success_count++;
1814         /*
1815          * Some devices deal with temporary internal resource
1816          * shortages by returning queue full.  When the queue
1817          * full occurrs, we throttle back.  Slowly try to get
1818          * back to our previous queue depth.
1819          */
1820         if ((dev->openings + dev->active) < dev->maxtags
1821          && dev->tag_success_count > AHC_TAG_SUCCESS_INTERVAL) {
1822                 dev->tag_success_count = 0;
1823                 dev->openings++;
1824         }
1825
1826         if (dev->active == 0)
1827                 dev->commands_since_idle_or_otag = 0;
1828
1829         if ((scb->flags & SCB_RECOVERY_SCB) != 0) {
1830                 printf("Recovery SCB completes\n");
1831                 if (ahc_get_transaction_status(scb) == CAM_BDR_SENT
1832                  || ahc_get_transaction_status(scb) == CAM_REQ_ABORTED)
1833                         ahc_set_transaction_status(scb, CAM_CMD_TIMEOUT);
1834                 if ((ahc->platform_data->flags & AHC_UP_EH_SEMAPHORE) != 0) {
1835                         ahc->platform_data->flags &= ~AHC_UP_EH_SEMAPHORE;
1836                         up(&ahc->platform_data->eh_sem);
1837                 }
1838         }
1839
1840         ahc_free_scb(ahc, scb);
1841         ahc_linux_queue_cmd_complete(ahc, cmd);
1842 }
1843
1844 static void
1845 ahc_linux_handle_scsi_status(struct ahc_softc *ahc,
1846                              struct scsi_device *sdev, struct scb *scb)
1847 {
1848         struct  ahc_devinfo devinfo;
1849         struct ahc_linux_device *dev = scsi_transport_device_data(sdev);
1850
1851         ahc_compile_devinfo(&devinfo,
1852                             ahc->our_id,
1853                             sdev->sdev_target->id, sdev->lun,
1854                             sdev->sdev_target->channel == 0 ? 'A' : 'B',
1855                             ROLE_INITIATOR);
1856
1857         /*
1858          * We don't currently trust the mid-layer to
1859          * properly deal with queue full or busy.  So,
1860          * when one occurs, we tell the mid-layer to
1861          * unconditionally requeue the command to us
1862          * so that we can retry it ourselves.  We also
1863          * implement our own throttling mechanism so
1864          * we don't clobber the device with too many
1865          * commands.
1866          */
1867         switch (ahc_get_scsi_status(scb)) {
1868         default:
1869                 break;
1870         case SCSI_STATUS_CHECK_COND:
1871         case SCSI_STATUS_CMD_TERMINATED:
1872         {
1873                 struct scsi_cmnd *cmd;
1874
1875                 /*
1876                  * Copy sense information to the OS's cmd
1877                  * structure if it is available.
1878                  */
1879                 cmd = scb->io_ctx;
1880                 if (scb->flags & SCB_SENSE) {
1881                         u_int sense_size;
1882
1883                         sense_size = MIN(sizeof(struct scsi_sense_data)
1884                                        - ahc_get_sense_residual(scb),
1885                                          sizeof(cmd->sense_buffer));
1886                         memcpy(cmd->sense_buffer,
1887                                ahc_get_sense_buf(ahc, scb), sense_size);
1888                         if (sense_size < sizeof(cmd->sense_buffer))
1889                                 memset(&cmd->sense_buffer[sense_size], 0,
1890                                        sizeof(cmd->sense_buffer) - sense_size);
1891                         cmd->result |= (DRIVER_SENSE << 24);
1892 #ifdef AHC_DEBUG
1893                         if (ahc_debug & AHC_SHOW_SENSE) {
1894                                 int i;
1895
1896                                 printf("Copied %d bytes of sense data:",
1897                                        sense_size);
1898                                 for (i = 0; i < sense_size; i++) {
1899                                         if ((i & 0xF) == 0)
1900                                                 printf("\n");
1901                                         printf("0x%x ", cmd->sense_buffer[i]);
1902                                 }
1903                                 printf("\n");
1904                         }
1905 #endif
1906                 }
1907                 break;
1908         }
1909         case SCSI_STATUS_QUEUE_FULL:
1910         {
1911                 /*
1912                  * By the time the core driver has returned this
1913                  * command, all other commands that were queued
1914                  * to us but not the device have been returned.
1915                  * This ensures that dev->active is equal to
1916                  * the number of commands actually queued to
1917                  * the device.
1918                  */
1919                 dev->tag_success_count = 0;
1920                 if (dev->active != 0) {
1921                         /*
1922                          * Drop our opening count to the number
1923                          * of commands currently outstanding.
1924                          */
1925                         dev->openings = 0;
1926 /*
1927                         ahc_print_path(ahc, scb);
1928                         printf("Dropping tag count to %d\n", dev->active);
1929  */
1930                         if (dev->active == dev->tags_on_last_queuefull) {
1931
1932                                 dev->last_queuefull_same_count++;
1933                                 /*
1934                                  * If we repeatedly see a queue full
1935                                  * at the same queue depth, this
1936                                  * device has a fixed number of tag
1937                                  * slots.  Lock in this tag depth
1938                                  * so we stop seeing queue fulls from
1939                                  * this device.
1940                                  */
1941                                 if (dev->last_queuefull_same_count
1942                                  == AHC_LOCK_TAGS_COUNT) {
1943                                         dev->maxtags = dev->active;
1944                                         ahc_print_path(ahc, scb);
1945                                         printf("Locking max tag count at %d\n",
1946                                                dev->active);
1947                                 }
1948                         } else {
1949                                 dev->tags_on_last_queuefull = dev->active;
1950                                 dev->last_queuefull_same_count = 0;
1951                         }
1952                         ahc_set_transaction_status(scb, CAM_REQUEUE_REQ);
1953                         ahc_set_scsi_status(scb, SCSI_STATUS_OK);
1954                         ahc_platform_set_tags(ahc, &devinfo,
1955                                      (dev->flags & AHC_DEV_Q_BASIC)
1956                                    ? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
1957                         break;
1958                 }
1959                 /*
1960                  * Drop down to a single opening, and treat this
1961                  * as if the target returned BUSY SCSI status.
1962                  */
1963                 dev->openings = 1;
1964                 ahc_set_scsi_status(scb, SCSI_STATUS_BUSY);
1965                 ahc_platform_set_tags(ahc, &devinfo,
1966                              (dev->flags & AHC_DEV_Q_BASIC)
1967                            ? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
1968                 break;
1969         }
1970         }
1971 }
1972
1973 static void
1974 ahc_linux_queue_cmd_complete(struct ahc_softc *ahc, struct scsi_cmnd *cmd)
1975 {
1976         /*
1977          * Map CAM error codes into Linux Error codes.  We
1978          * avoid the conversion so that the DV code has the
1979          * full error information available when making
1980          * state change decisions.
1981          */
1982         {
1983                 u_int new_status;
1984
1985                 switch (ahc_cmd_get_transaction_status(cmd)) {
1986                 case CAM_REQ_INPROG:
1987                 case CAM_REQ_CMP:
1988                 case CAM_SCSI_STATUS_ERROR:
1989                         new_status = DID_OK;
1990                         break;
1991                 case CAM_REQ_ABORTED:
1992                         new_status = DID_ABORT;
1993                         break;
1994                 case CAM_BUSY:
1995                         new_status = DID_BUS_BUSY;
1996                         break;
1997                 case CAM_REQ_INVALID:
1998                 case CAM_PATH_INVALID:
1999                         new_status = DID_BAD_TARGET;
2000                         break;
2001                 case CAM_SEL_TIMEOUT:
2002                         new_status = DID_NO_CONNECT;
2003                         break;
2004                 case CAM_SCSI_BUS_RESET:
2005                 case CAM_BDR_SENT:
2006                         new_status = DID_RESET;
2007                         break;
2008                 case CAM_UNCOR_PARITY:
2009                         new_status = DID_PARITY;
2010                         break;
2011                 case CAM_CMD_TIMEOUT:
2012                         new_status = DID_TIME_OUT;
2013                         break;
2014                 case CAM_UA_ABORT:
2015                 case CAM_REQ_CMP_ERR:
2016                 case CAM_AUTOSENSE_FAIL:
2017                 case CAM_NO_HBA:
2018                 case CAM_DATA_RUN_ERR:
2019                 case CAM_UNEXP_BUSFREE:
2020                 case CAM_SEQUENCE_FAIL:
2021                 case CAM_CCB_LEN_ERR:
2022                 case CAM_PROVIDE_FAIL:
2023                 case CAM_REQ_TERMIO:
2024                 case CAM_UNREC_HBA_ERROR:
2025                 case CAM_REQ_TOO_BIG:
2026                         new_status = DID_ERROR;
2027                         break;
2028                 case CAM_REQUEUE_REQ:
2029                         new_status = DID_REQUEUE;
2030                         break;
2031                 default:
2032                         /* We should never get here */
2033                         new_status = DID_ERROR;
2034                         break;
2035                 }
2036
2037                 ahc_cmd_set_transaction_status(cmd, new_status);
2038         }
2039
2040         cmd->scsi_done(cmd);
2041 }
2042
2043 static void
2044 ahc_linux_sem_timeout(u_long arg)
2045 {
2046         struct  ahc_softc *ahc;
2047         u_long  s;
2048
2049         ahc = (struct ahc_softc *)arg;
2050
2051         ahc_lock(ahc, &s);
2052         if ((ahc->platform_data->flags & AHC_UP_EH_SEMAPHORE) != 0) {
2053                 ahc->platform_data->flags &= ~AHC_UP_EH_SEMAPHORE;
2054                 up(&ahc->platform_data->eh_sem);
2055         }
2056         ahc_unlock(ahc, &s);
2057 }
2058
2059 static void
2060 ahc_linux_freeze_simq(struct ahc_softc *ahc)
2061 {
2062         ahc->platform_data->qfrozen++;
2063         if (ahc->platform_data->qfrozen == 1) {
2064                 scsi_block_requests(ahc->platform_data->host);
2065
2066                 /* XXX What about Twin channels? */
2067                 ahc_platform_abort_scbs(ahc, CAM_TARGET_WILDCARD, ALL_CHANNELS,
2068                                         CAM_LUN_WILDCARD, SCB_LIST_NULL,
2069                                         ROLE_INITIATOR, CAM_REQUEUE_REQ);
2070         }
2071 }
2072
2073 static void
2074 ahc_linux_release_simq(u_long arg)
2075 {
2076         struct ahc_softc *ahc;
2077         u_long s;
2078         int    unblock_reqs;
2079
2080         ahc = (struct ahc_softc *)arg;
2081
2082         unblock_reqs = 0;
2083         ahc_lock(ahc, &s);
2084         if (ahc->platform_data->qfrozen > 0)
2085                 ahc->platform_data->qfrozen--;
2086         if (ahc->platform_data->qfrozen == 0)
2087                 unblock_reqs = 1;
2088         ahc_unlock(ahc, &s);
2089         /*
2090          * There is still a race here.  The mid-layer
2091          * should keep its own freeze count and use
2092          * a bottom half handler to run the queues
2093          * so we can unblock with our own lock held.
2094          */
2095         if (unblock_reqs)
2096                 scsi_unblock_requests(ahc->platform_data->host);
2097 }
2098
2099 static int
2100 ahc_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag)
2101 {
2102         struct ahc_softc *ahc;
2103         struct ahc_linux_device *dev;
2104         struct scb *pending_scb;
2105         u_int  saved_scbptr;
2106         u_int  active_scb_index;
2107         u_int  last_phase;
2108         u_int  saved_scsiid;
2109         u_int  cdb_byte;
2110         int    retval;
2111         int    was_paused;
2112         int    paused;
2113         int    wait;
2114         int    disconnected;
2115         unsigned long flags;
2116
2117         pending_scb = NULL;
2118         paused = FALSE;
2119         wait = FALSE;
2120         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
2121
2122         scmd_printk(KERN_INFO, cmd, "Attempting to queue a%s message\n",
2123                flag == SCB_ABORT ? "n ABORT" : " TARGET RESET");
2124
2125         printf("CDB:");
2126         for (cdb_byte = 0; cdb_byte < cmd->cmd_len; cdb_byte++)
2127                 printf(" 0x%x", cmd->cmnd[cdb_byte]);
2128         printf("\n");
2129
2130         ahc_lock(ahc, &flags);
2131
2132         /*
2133          * First determine if we currently own this command.
2134          * Start by searching the device queue.  If not found
2135          * there, check the pending_scb list.  If not found
2136          * at all, and the system wanted us to just abort the
2137          * command, return success.
2138          */
2139         dev = scsi_transport_device_data(cmd->device);
2140
2141         if (dev == NULL) {
2142                 /*
2143                  * No target device for this command exists,
2144                  * so we must not still own the command.
2145                  */
2146                 printf("%s:%d:%d:%d: Is not an active device\n",
2147                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2148                        cmd->device->lun);
2149                 retval = SUCCESS;
2150                 goto no_cmd;
2151         }
2152
2153         if ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED)) == 0
2154          && ahc_search_untagged_queues(ahc, cmd, cmd->device->id,
2155                                        cmd->device->channel + 'A',
2156                                        cmd->device->lun,
2157                                        CAM_REQ_ABORTED, SEARCH_COMPLETE) != 0) {
2158                 printf("%s:%d:%d:%d: Command found on untagged queue\n",
2159                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2160                        cmd->device->lun);
2161                 retval = SUCCESS;
2162                 goto done;
2163         }
2164
2165         /*
2166          * See if we can find a matching cmd in the pending list.
2167          */
2168         LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
2169                 if (pending_scb->io_ctx == cmd)
2170                         break;
2171         }
2172
2173         if (pending_scb == NULL && flag == SCB_DEVICE_RESET) {
2174
2175                 /* Any SCB for this device will do for a target reset */
2176                 LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
2177                         if (ahc_match_scb(ahc, pending_scb, scmd_id(cmd),
2178                                           scmd_channel(cmd) + 'A',
2179                                           CAM_LUN_WILDCARD,
2180                                           SCB_LIST_NULL, ROLE_INITIATOR))
2181                                 break;
2182                 }
2183         }
2184
2185         if (pending_scb == NULL) {
2186                 scmd_printk(KERN_INFO, cmd, "Command not found\n");
2187                 goto no_cmd;
2188         }
2189
2190         if ((pending_scb->flags & SCB_RECOVERY_SCB) != 0) {
2191                 /*
2192                  * We can't queue two recovery actions using the same SCB
2193                  */
2194                 retval = FAILED;
2195                 goto  done;
2196         }
2197
2198         /*
2199          * Ensure that the card doesn't do anything
2200          * behind our back and that we didn't "just" miss
2201          * an interrupt that would affect this cmd.
2202          */
2203         was_paused = ahc_is_paused(ahc);
2204         ahc_pause_and_flushwork(ahc);
2205         paused = TRUE;
2206
2207         if ((pending_scb->flags & SCB_ACTIVE) == 0) {
2208                 scmd_printk(KERN_INFO, cmd, "Command already completed\n");
2209                 goto no_cmd;
2210         }
2211
2212         printf("%s: At time of recovery, card was %spaused\n",
2213                ahc_name(ahc), was_paused ? "" : "not ");
2214         ahc_dump_card_state(ahc);
2215
2216         disconnected = TRUE;
2217         if (flag == SCB_ABORT) {
2218                 if (ahc_search_qinfifo(ahc, cmd->device->id,
2219                                        cmd->device->channel + 'A',
2220                                        cmd->device->lun,
2221                                        pending_scb->hscb->tag,
2222                                        ROLE_INITIATOR, CAM_REQ_ABORTED,
2223                                        SEARCH_COMPLETE) > 0) {
2224                         printf("%s:%d:%d:%d: Cmd aborted from QINFIFO\n",
2225                                ahc_name(ahc), cmd->device->channel,
2226                                         cmd->device->id, cmd->device->lun);
2227                         retval = SUCCESS;
2228                         goto done;
2229                 }
2230         } else if (ahc_search_qinfifo(ahc, cmd->device->id,
2231                                       cmd->device->channel + 'A',
2232                                       cmd->device->lun, pending_scb->hscb->tag,
2233                                       ROLE_INITIATOR, /*status*/0,
2234                                       SEARCH_COUNT) > 0) {
2235                 disconnected = FALSE;
2236         }
2237
2238         if (disconnected && (ahc_inb(ahc, SEQ_FLAGS) & NOT_IDENTIFIED) == 0) {
2239                 struct scb *bus_scb;
2240
2241                 bus_scb = ahc_lookup_scb(ahc, ahc_inb(ahc, SCB_TAG));
2242                 if (bus_scb == pending_scb)
2243                         disconnected = FALSE;
2244                 else if (flag != SCB_ABORT
2245                       && ahc_inb(ahc, SAVED_SCSIID) == pending_scb->hscb->scsiid
2246                       && ahc_inb(ahc, SAVED_LUN) == SCB_GET_LUN(pending_scb))
2247                         disconnected = FALSE;
2248         }
2249
2250         /*
2251          * At this point, pending_scb is the scb associated with the
2252          * passed in command.  That command is currently active on the
2253          * bus, is in the disconnected state, or we're hoping to find
2254          * a command for the same target active on the bus to abuse to
2255          * send a BDR.  Queue the appropriate message based on which of
2256          * these states we are in.
2257          */
2258         last_phase = ahc_inb(ahc, LASTPHASE);
2259         saved_scbptr = ahc_inb(ahc, SCBPTR);
2260         active_scb_index = ahc_inb(ahc, SCB_TAG);
2261         saved_scsiid = ahc_inb(ahc, SAVED_SCSIID);
2262         if (last_phase != P_BUSFREE
2263          && (pending_scb->hscb->tag == active_scb_index
2264           || (flag == SCB_DEVICE_RESET
2265            && SCSIID_TARGET(ahc, saved_scsiid) == scmd_id(cmd)))) {
2266
2267                 /*
2268                  * We're active on the bus, so assert ATN
2269                  * and hope that the target responds.
2270                  */
2271                 pending_scb = ahc_lookup_scb(ahc, active_scb_index);
2272                 pending_scb->flags |= SCB_RECOVERY_SCB|flag;
2273                 ahc_outb(ahc, MSG_OUT, HOST_MSG);
2274                 ahc_outb(ahc, SCSISIGO, last_phase|ATNO);
2275                 scmd_printk(KERN_INFO, cmd, "Device is active, asserting ATN\n");
2276                 wait = TRUE;
2277         } else if (disconnected) {
2278
2279                 /*
2280                  * Actually re-queue this SCB in an attempt
2281                  * to select the device before it reconnects.
2282                  * In either case (selection or reselection),
2283                  * we will now issue the approprate message
2284                  * to the timed-out device.
2285                  *
2286                  * Set the MK_MESSAGE control bit indicating
2287                  * that we desire to send a message.  We
2288                  * also set the disconnected flag since
2289                  * in the paging case there is no guarantee
2290                  * that our SCB control byte matches the
2291                  * version on the card.  We don't want the
2292                  * sequencer to abort the command thinking
2293                  * an unsolicited reselection occurred.
2294                  */
2295                 pending_scb->hscb->control |= MK_MESSAGE|DISCONNECTED;
2296                 pending_scb->flags |= SCB_RECOVERY_SCB|flag;
2297
2298                 /*
2299                  * Remove any cached copy of this SCB in the
2300                  * disconnected list in preparation for the
2301                  * queuing of our abort SCB.  We use the
2302                  * same element in the SCB, SCB_NEXT, for
2303                  * both the qinfifo and the disconnected list.
2304                  */
2305                 ahc_search_disc_list(ahc, cmd->device->id,
2306                                      cmd->device->channel + 'A',
2307                                      cmd->device->lun, pending_scb->hscb->tag,
2308                                      /*stop_on_first*/TRUE,
2309                                      /*remove*/TRUE,
2310                                      /*save_state*/FALSE);
2311
2312                 /*
2313                  * In the non-paging case, the sequencer will
2314                  * never re-reference the in-core SCB.
2315                  * To make sure we are notified during
2316                  * reslection, set the MK_MESSAGE flag in
2317                  * the card's copy of the SCB.
2318                  */
2319                 if ((ahc->flags & AHC_PAGESCBS) == 0) {
2320                         ahc_outb(ahc, SCBPTR, pending_scb->hscb->tag);
2321                         ahc_outb(ahc, SCB_CONTROL,
2322                                  ahc_inb(ahc, SCB_CONTROL)|MK_MESSAGE);
2323                 }
2324
2325                 /*
2326                  * Clear out any entries in the QINFIFO first
2327                  * so we are the next SCB for this target
2328                  * to run.
2329                  */
2330                 ahc_search_qinfifo(ahc, cmd->device->id,
2331                                    cmd->device->channel + 'A',
2332                                    cmd->device->lun, SCB_LIST_NULL,
2333                                    ROLE_INITIATOR, CAM_REQUEUE_REQ,
2334                                    SEARCH_COMPLETE);
2335                 ahc_qinfifo_requeue_tail(ahc, pending_scb);
2336                 ahc_outb(ahc, SCBPTR, saved_scbptr);
2337                 ahc_print_path(ahc, pending_scb);
2338                 printf("Device is disconnected, re-queuing SCB\n");
2339                 wait = TRUE;
2340         } else {
2341                 scmd_printk(KERN_INFO, cmd, "Unable to deliver message\n");
2342                 retval = FAILED;
2343                 goto done;
2344         }
2345
2346 no_cmd:
2347         /*
2348          * Our assumption is that if we don't have the command, no
2349          * recovery action was required, so we return success.  Again,
2350          * the semantics of the mid-layer recovery engine are not
2351          * well defined, so this may change in time.
2352          */
2353         retval = SUCCESS;
2354 done:
2355         if (paused)
2356                 ahc_unpause(ahc);
2357         if (wait) {
2358                 struct timer_list timer;
2359                 int ret;
2360
2361                 ahc->platform_data->flags |= AHC_UP_EH_SEMAPHORE;
2362                 ahc_unlock(ahc, &flags);
2363
2364                 init_timer(&timer);
2365                 timer.data = (u_long)ahc;
2366                 timer.expires = jiffies + (5 * HZ);
2367                 timer.function = ahc_linux_sem_timeout;
2368                 add_timer(&timer);
2369                 printf("Recovery code sleeping\n");
2370                 down(&ahc->platform_data->eh_sem);
2371                 printf("Recovery code awake\n");
2372                 ret = del_timer_sync(&timer);
2373                 if (ret == 0) {
2374                         printf("Timer Expired\n");
2375                         retval = FAILED;
2376                 }
2377         } else
2378                 ahc_unlock(ahc, &flags);
2379         return (retval);
2380 }
2381
2382 void
2383 ahc_platform_dump_card_state(struct ahc_softc *ahc)
2384 {
2385 }
2386
2387 static void ahc_linux_set_width(struct scsi_target *starget, int width)
2388 {
2389         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2390         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2391         struct ahc_devinfo devinfo;
2392         unsigned long flags;
2393
2394         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2395                             starget->channel + 'A', ROLE_INITIATOR);
2396         ahc_lock(ahc, &flags);
2397         ahc_set_width(ahc, &devinfo, width, AHC_TRANS_GOAL, FALSE);
2398         ahc_unlock(ahc, &flags);
2399 }
2400
2401 static void ahc_linux_set_period(struct scsi_target *starget, int period)
2402 {
2403         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2404         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2405         struct ahc_tmode_tstate *tstate;
2406         struct ahc_initiator_tinfo *tinfo
2407                 = ahc_fetch_transinfo(ahc,
2408                                       starget->channel + 'A',
2409                                       shost->this_id, starget->id, &tstate);
2410         struct ahc_devinfo devinfo;
2411         unsigned int ppr_options = tinfo->goal.ppr_options;
2412         unsigned long flags;
2413         unsigned long offset = tinfo->goal.offset;
2414         struct ahc_syncrate *syncrate;
2415
2416         if (offset == 0)
2417                 offset = MAX_OFFSET;
2418
2419         if (period < 9)
2420                 period = 9;     /* 12.5ns is our minimum */
2421         if (period == 9)
2422                 ppr_options |= MSG_EXT_PPR_DT_REQ;
2423
2424         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2425                             starget->channel + 'A', ROLE_INITIATOR);
2426
2427         /* all PPR requests apart from QAS require wide transfers */
2428         if (ppr_options & ~MSG_EXT_PPR_QAS_REQ) {
2429                 if (spi_width(starget) == 0)
2430                         ppr_options &= MSG_EXT_PPR_QAS_REQ;
2431         }
2432
2433         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2434         ahc_lock(ahc, &flags);
2435         ahc_set_syncrate(ahc, &devinfo, syncrate, period, offset,
2436                          ppr_options, AHC_TRANS_GOAL, FALSE);
2437         ahc_unlock(ahc, &flags);
2438 }
2439
2440 static void ahc_linux_set_offset(struct scsi_target *starget, int offset)
2441 {
2442         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2443         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2444         struct ahc_tmode_tstate *tstate;
2445         struct ahc_initiator_tinfo *tinfo
2446                 = ahc_fetch_transinfo(ahc,
2447                                       starget->channel + 'A',
2448                                       shost->this_id, starget->id, &tstate);
2449         struct ahc_devinfo devinfo;
2450         unsigned int ppr_options = 0;
2451         unsigned int period = 0;
2452         unsigned long flags;
2453         struct ahc_syncrate *syncrate = NULL;
2454
2455         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2456                             starget->channel + 'A', ROLE_INITIATOR);
2457         if (offset != 0) {
2458                 syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2459                 period = tinfo->goal.period;
2460                 ppr_options = tinfo->goal.ppr_options;
2461         }
2462         ahc_lock(ahc, &flags);
2463         ahc_set_syncrate(ahc, &devinfo, syncrate, period, offset,
2464                          ppr_options, AHC_TRANS_GOAL, FALSE);
2465         ahc_unlock(ahc, &flags);
2466 }
2467
2468 static void ahc_linux_set_dt(struct scsi_target *starget, int dt)
2469 {
2470         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2471         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2472         struct ahc_tmode_tstate *tstate;
2473         struct ahc_initiator_tinfo *tinfo
2474                 = ahc_fetch_transinfo(ahc,
2475                                       starget->channel + 'A',
2476                                       shost->this_id, starget->id, &tstate);
2477         struct ahc_devinfo devinfo;
2478         unsigned int ppr_options = tinfo->goal.ppr_options
2479                 & ~MSG_EXT_PPR_DT_REQ;
2480         unsigned int period = tinfo->goal.period;
2481         unsigned int width = tinfo->goal.width;
2482         unsigned long flags;
2483         struct ahc_syncrate *syncrate;
2484
2485         if (dt) {
2486                 ppr_options |= MSG_EXT_PPR_DT_REQ;
2487                 if (!width)
2488                         ahc_linux_set_width(starget, 1);
2489         } else if (period == 9)
2490                 period = 10;    /* if resetting DT, period must be >= 25ns */
2491
2492         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2493                             starget->channel + 'A', ROLE_INITIATOR);
2494         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options,AHC_SYNCRATE_DT);
2495         ahc_lock(ahc, &flags);
2496         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2497                          ppr_options, AHC_TRANS_GOAL, FALSE);
2498         ahc_unlock(ahc, &flags);
2499 }
2500
2501 #if 0
2502 /* FIXME: This code claims to support IU and QAS.  However, the actual
2503  * sequencer code and aic7xxx_core have no support for these parameters and
2504  * will get into a bad state if they're negotiated.  Do not enable this
2505  * unless you know what you're doing */
2506 static void ahc_linux_set_qas(struct scsi_target *starget, int qas)
2507 {
2508         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2509         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2510         struct ahc_tmode_tstate *tstate;
2511         struct ahc_initiator_tinfo *tinfo
2512                 = ahc_fetch_transinfo(ahc,
2513                                       starget->channel + 'A',
2514                                       shost->this_id, starget->id, &tstate);
2515         struct ahc_devinfo devinfo;
2516         unsigned int ppr_options = tinfo->goal.ppr_options
2517                 & ~MSG_EXT_PPR_QAS_REQ;
2518         unsigned int period = tinfo->goal.period;
2519         unsigned long flags;
2520         struct ahc_syncrate *syncrate;
2521
2522         if (qas)
2523                 ppr_options |= MSG_EXT_PPR_QAS_REQ;
2524
2525         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2526                             starget->channel + 'A', ROLE_INITIATOR);
2527         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2528         ahc_lock(ahc, &flags);
2529         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2530                          ppr_options, AHC_TRANS_GOAL, FALSE);
2531         ahc_unlock(ahc, &flags);
2532 }
2533
2534 static void ahc_linux_set_iu(struct scsi_target *starget, int iu)
2535 {
2536         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2537         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2538         struct ahc_tmode_tstate *tstate;
2539         struct ahc_initiator_tinfo *tinfo
2540                 = ahc_fetch_transinfo(ahc,
2541                                       starget->channel + 'A',
2542                                       shost->this_id, starget->id, &tstate);
2543         struct ahc_devinfo devinfo;
2544         unsigned int ppr_options = tinfo->goal.ppr_options
2545                 & ~MSG_EXT_PPR_IU_REQ;
2546         unsigned int period = tinfo->goal.period;
2547         unsigned long flags;
2548         struct ahc_syncrate *syncrate;
2549
2550         if (iu)
2551                 ppr_options |= MSG_EXT_PPR_IU_REQ;
2552
2553         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2554                             starget->channel + 'A', ROLE_INITIATOR);
2555         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2556         ahc_lock(ahc, &flags);
2557         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2558                          ppr_options, AHC_TRANS_GOAL, FALSE);
2559         ahc_unlock(ahc, &flags);
2560 }
2561 #endif
2562
2563 static struct spi_function_template ahc_linux_transport_functions = {
2564         .set_offset     = ahc_linux_set_offset,
2565         .show_offset    = 1,
2566         .set_period     = ahc_linux_set_period,
2567         .show_period    = 1,
2568         .set_width      = ahc_linux_set_width,
2569         .show_width     = 1,
2570         .set_dt         = ahc_linux_set_dt,
2571         .show_dt        = 1,
2572 #if 0
2573         .set_iu         = ahc_linux_set_iu,
2574         .show_iu        = 1,
2575         .set_qas        = ahc_linux_set_qas,
2576         .show_qas       = 1,
2577 #endif
2578 };
2579
2580
2581
2582 static int __init
2583 ahc_linux_init(void)
2584 {
2585         /*
2586          * If we've been passed any parameters, process them now.
2587          */
2588         if (aic7xxx)
2589                 aic7xxx_setup(aic7xxx);
2590
2591         ahc_linux_transport_template =
2592                 spi_attach_transport(&ahc_linux_transport_functions);
2593         if (!ahc_linux_transport_template)
2594                 return -ENODEV;
2595
2596         scsi_transport_reserve_target(ahc_linux_transport_template,
2597                                       sizeof(struct ahc_linux_target));
2598         scsi_transport_reserve_device(ahc_linux_transport_template,
2599                                       sizeof(struct ahc_linux_device));
2600
2601         ahc_linux_pci_init();
2602         ahc_linux_eisa_init();
2603         return 0;
2604 }
2605
2606 static void
2607 ahc_linux_exit(void)
2608 {
2609         ahc_linux_pci_exit();
2610         ahc_linux_eisa_exit();
2611         spi_release_transport(ahc_linux_transport_template);
2612 }
2613
2614 module_init(ahc_linux_init);
2615 module_exit(ahc_linux_exit);