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 "       tag_info:<tag_str>      Set per-target tag depth\n"
 357 "       global_tag_depth:<int>  Global tag depth for every target\n"
 358 "                               on every bus\n"
 359 "       seltime:<int>           Selection Timeout\n"
 360 "                               (0/256ms,1/128ms,2/64ms,3/32ms)\n"
 361 "\n"
 362 "       Sample /etc/modprobe.conf line:\n"
 363 "               Toggle EISA/VLB probing\n"
 364 "               Set tag depth on Controller 1/Target 1 to 10 tags\n"
 365 "               Shorten the selection timeout to 128ms\n"
 366 "\n"
 367 "       options aic7xxx 'aic7xxx=probe_eisa_vl.tag_info:{{}.{.10}}.seltime:1'\n"
 368 );
 369
 370 static void ahc_linux_handle_scsi_status(struct ahc_softc *,
 371                                          struct scsi_device *,
 372                                          struct scb *);
 373 static void ahc_linux_queue_cmd_complete(struct ahc_softc *ahc,
 374                                          struct scsi_cmnd *cmd);
 375 static void ahc_linux_freeze_simq(struct ahc_softc *ahc);
 376 static void ahc_linux_release_simq(struct ahc_softc *ahc);
 377 static int  ahc_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag);
 378 static void ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc);
 379 static u_int ahc_linux_user_tagdepth(struct ahc_softc *ahc,
 380                                      struct ahc_devinfo *devinfo);
 381 static void ahc_linux_device_queue_depth(struct scsi_device *);
 382 static int ahc_linux_run_command(struct ahc_softc*,
 383                                  struct ahc_linux_device *,
 384                                  struct scsi_cmnd *);
 385 static void ahc_linux_setup_tag_info_global(char *p);
 386 static int  aic7xxx_setup(char *s);
 387
 388 static int ahc_linux_unit;
 389
 390
 391 /********************************* Inlines ************************************/
 392 static __inline void ahc_linux_unmap_scb(struct ahc_softc*, struct scb*);
 393
 394 static __inline int ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb,
 395                                       struct ahc_dma_seg *sg,
 396                                       dma_addr_t addr, bus_size_t len);
 397
 398 static __inline void
 399 ahc_linux_unmap_scb(struct ahc_softc *ahc, struct scb *scb)
 400 {
 401         struct scsi_cmnd *cmd;
 402
 403         cmd = scb->io_ctx;
 404         ahc_sync_sglist(ahc, scb, BUS_DMASYNC_POSTWRITE);
 405         if (cmd->use_sg != 0) {
 406                 struct scatterlist *sg;
 407
 408                 sg = (struct scatterlist *)cmd->request_buffer;
 409                 pci_unmap_sg(ahc->dev_softc, sg, cmd->use_sg,
 410                              cmd->sc_data_direction);
 411         } else if (cmd->request_bufflen != 0) {
 412                 pci_unmap_single(ahc->dev_softc,
 413                                  scb->platform_data->buf_busaddr,
 414                                  cmd->request_bufflen,
 415                                  cmd->sc_data_direction);
 416         }
 417 }
 418
 419 static __inline int
 420 ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb,
 421                   struct ahc_dma_seg *sg, dma_addr_t addr, bus_size_t len)
 422 {
 423         int      consumed;
 424
 425         if ((scb->sg_count + 1) > AHC_NSEG)
 426                 panic("Too few segs for dma mapping.  "
 427                       "Increase AHC_NSEG\n");
 428
 429         consumed = 1;
 430         sg->addr = ahc_htole32(addr & 0xFFFFFFFF);
 431         scb->platform_data->xfer_len += len;
 432
 433         if (sizeof(dma_addr_t) > 4
 434          && (ahc->flags & AHC_39BIT_ADDRESSING) != 0)
 435                 len |= (addr >> 8) & AHC_SG_HIGH_ADDR_MASK;
 436
 437         sg->len = ahc_htole32(len);
 438         return (consumed);
 439 }
 440
 441 /*
 442  * Return a string describing the driver.
 443  */
 444 static const char *
 445 ahc_linux_info(struct Scsi_Host *host)
 446 {
 447         static char buffer[512];
 448         char    ahc_info[256];
 449         char   *bp;
 450         struct ahc_softc *ahc;
 451
 452         bp = &buffer[0];
 453         ahc = *(struct ahc_softc **)host->hostdata;
 454         memset(bp, 0, sizeof(buffer));
 455         strcpy(bp, "Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev ");
 456         strcat(bp, AIC7XXX_DRIVER_VERSION);
 457         strcat(bp, "\n");
 458         strcat(bp, "        <");
 459         strcat(bp, ahc->description);
 460         strcat(bp, ">\n");
 461         strcat(bp, "        ");
 462         ahc_controller_info(ahc, ahc_info);
 463         strcat(bp, ahc_info);
 464         strcat(bp, "\n");
 465
 466         return (bp);
 467 }
 468
 469 /*
 470  * Queue an SCB to the controller.
 471  */
 472 static int
 473 ahc_linux_queue(struct scsi_cmnd * cmd, void (*scsi_done) (struct scsi_cmnd *))
 474 {
 475         struct   ahc_softc *ahc;
 476         struct   ahc_linux_device *dev = scsi_transport_device_data(cmd->device);
 477         int rtn = SCSI_MLQUEUE_HOST_BUSY;
 478         unsigned long flags;
 479
 480         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
 481
 482         ahc_lock(ahc, &flags);
 483         if (ahc->platform_data->qfrozen == 0) {
 484                 cmd->scsi_done = scsi_done;
 485                 cmd->result = CAM_REQ_INPROG << 16;
 486                 rtn = ahc_linux_run_command(ahc, dev, cmd);
 487         }
 488         ahc_unlock(ahc, &flags);
 489
 490         return rtn;
 491 }
 492
 493 static inline struct scsi_target **
 494 ahc_linux_target_in_softc(struct scsi_target *starget)
 495 {
 496         struct  ahc_softc *ahc =
 497                 *((struct ahc_softc **)dev_to_shost(&starget->dev)->hostdata);
 498         unsigned int target_offset;
 499
 500         target_offset = starget->id;
 501         if (starget->channel != 0)
 502                 target_offset += 8;
 503
 504         return &ahc->platform_data->starget[target_offset];
 505 }
 506
 507 static int
 508 ahc_linux_target_alloc(struct scsi_target *starget)
 509 {
 510         struct  ahc_softc *ahc =
 511                 *((struct ahc_softc **)dev_to_shost(&starget->dev)->hostdata);
 512         struct seeprom_config *sc = ahc->seep_config;
 513         unsigned long flags;
 514         struct scsi_target **ahc_targp = ahc_linux_target_in_softc(starget);
 515         struct ahc_linux_target *targ = scsi_transport_target_data(starget);
 516         unsigned short scsirate;
 517         struct ahc_devinfo devinfo;
 518         struct ahc_initiator_tinfo *tinfo;
 519         struct ahc_tmode_tstate *tstate;
 520         char channel = starget->channel + 'A';
 521         unsigned int our_id = ahc->our_id;
 522         unsigned int target_offset;
 523
 524         target_offset = starget->id;
 525         if (starget->channel != 0)
 526                 target_offset += 8;
 527
 528         if (starget->channel)
 529                 our_id = ahc->our_id_b;
 530
 531         ahc_lock(ahc, &flags);
 532
 533         BUG_ON(*ahc_targp != NULL);
 534
 535         *ahc_targp = starget;
 536         memset(targ, 0, sizeof(*targ));
 537
 538         if (sc) {
 539                 int maxsync = AHC_SYNCRATE_DT;
 540                 int ultra = 0;
 541                 int flags = sc->device_flags[target_offset];
 542
 543                 if (ahc->flags & AHC_NEWEEPROM_FMT) {
 544                     if (flags & CFSYNCHISULTRA)
 545                         ultra = 1;
 546                 } else if (flags & CFULTRAEN)
 547                         ultra = 1;
 548                 /* AIC nutcase; 10MHz appears as ultra = 1, CFXFER = 0x04
 549                  * change it to ultra=0, CFXFER = 0 */
 550                 if(ultra && (flags & CFXFER) == 0x04) {
 551                         ultra = 0;
 552                         flags &= ~CFXFER;
 553                 }
 554
 555                 if ((ahc->features & AHC_ULTRA2) != 0) {
 556                         scsirate = (flags & CFXFER) | (ultra ? 0x8 : 0);
 557                 } else {
 558                         scsirate = (flags & CFXFER) << 4;
 559                         maxsync = ultra ? AHC_SYNCRATE_ULTRA :
 560                                 AHC_SYNCRATE_FAST;
 561                 }
 562                 spi_max_width(starget) = (flags & CFWIDEB) ? 1 : 0;
 563                 if (!(flags & CFSYNCH))
 564                         spi_max_offset(starget) = 0;
 565                 spi_min_period(starget) =
 566                         ahc_find_period(ahc, scsirate, maxsync);
 567
 568                 tinfo = ahc_fetch_transinfo(ahc, channel, ahc->our_id,
 569                                             starget->id, &tstate);
 570         }
 571         ahc_compile_devinfo(&devinfo, our_id, starget->id,
 572                             CAM_LUN_WILDCARD, channel,
 573                             ROLE_INITIATOR);
 574         ahc_set_syncrate(ahc, &devinfo, NULL, 0, 0, 0,
 575                          AHC_TRANS_GOAL, /*paused*/FALSE);
 576         ahc_set_width(ahc, &devinfo, MSG_EXT_WDTR_BUS_8_BIT,
 577                       AHC_TRANS_GOAL, /*paused*/FALSE);
 578         ahc_unlock(ahc, &flags);
 579
 580         return 0;
 581 }
 582
 583 static void
 584 ahc_linux_target_destroy(struct scsi_target *starget)
 585 {
 586         struct scsi_target **ahc_targp = ahc_linux_target_in_softc(starget);
 587
 588         *ahc_targp = NULL;
 589 }
 590
 591 static int
 592 ahc_linux_slave_alloc(struct scsi_device *sdev)
 593 {
 594         struct  ahc_softc *ahc =
 595                 *((struct ahc_softc **)sdev->host->hostdata);
 596         struct scsi_target *starget = sdev->sdev_target;
 597         struct ahc_linux_target *targ = scsi_transport_target_data(starget);
 598         struct ahc_linux_device *dev;
 599
 600         if (bootverbose)
 601                 printf("%s: Slave Alloc %d\n", ahc_name(ahc), sdev->id);
 602
 603         BUG_ON(targ->sdev[sdev->lun] != NULL);
 604
 605         dev = scsi_transport_device_data(sdev);
 606         memset(dev, 0, sizeof(*dev));
 607
 608         /*
 609          * We start out life using untagged
 610          * transactions of which we allow one.
 611          */
 612         dev->openings = 1;
 613
 614         /*
 615          * Set maxtags to 0.  This will be changed if we
 616          * later determine that we are dealing with
 617          * a tagged queuing capable device.
 618          */
 619         dev->maxtags = 0;
 620
 621         targ->sdev[sdev->lun] = sdev;
 622
 623         spi_period(starget) = 0;
 624
 625         return 0;
 626 }
 627
 628 static int
 629 ahc_linux_slave_configure(struct scsi_device *sdev)
 630 {
 631         struct  ahc_softc *ahc;
 632
 633         ahc = *((struct ahc_softc **)sdev->host->hostdata);
 634
 635         if (bootverbose)
 636                 sdev_printk(KERN_INFO, sdev, "Slave Configure\n");
 637
 638         ahc_linux_device_queue_depth(sdev);
 639
 640         /* Initial Domain Validation */
 641         if (!spi_initial_dv(sdev->sdev_target))
 642                 spi_dv_device(sdev);
 643
 644         return 0;
 645 }
 646
 647 static void
 648 ahc_linux_slave_destroy(struct scsi_device *sdev)
 649 {
 650         struct  ahc_softc *ahc;
 651         struct  ahc_linux_device *dev = scsi_transport_device_data(sdev);
 652         struct  ahc_linux_target *targ = scsi_transport_target_data(sdev->sdev_target);
 653
 654         ahc = *((struct ahc_softc **)sdev->host->hostdata);
 655         if (bootverbose)
 656                 printf("%s: Slave Destroy %d\n", ahc_name(ahc), sdev->id);
 657
 658         BUG_ON(dev->active);
 659
 660         targ->sdev[sdev->lun] = NULL;
 661 }
 662
 663 #if defined(__i386__)
 664 /*
 665  * Return the disk geometry for the given SCSI device.
 666  */
 667 static int
 668 ahc_linux_biosparam(struct scsi_device *sdev, struct block_device *bdev,
 669                     sector_t capacity, int geom[])
 670 {
 671         uint8_t *bh;
 672         int      heads;
 673         int      sectors;
 674         int      cylinders;
 675         int      ret;
 676         int      extended;
 677         struct   ahc_softc *ahc;
 678         u_int    channel;
 679
 680         ahc = *((struct ahc_softc **)sdev->host->hostdata);
 681         channel = sdev_channel(sdev);
 682
 683         bh = scsi_bios_ptable(bdev);
 684         if (bh) {
 685                 ret = scsi_partsize(bh, capacity,
 686                                     &geom[2], &geom[0], &geom[1]);
 687                 kfree(bh);
 688                 if (ret != -1)
 689                         return (ret);
 690         }
 691         heads = 64;
 692         sectors = 32;
 693         cylinders = aic_sector_div(capacity, heads, sectors);
 694
 695         if (aic7xxx_extended != 0)
 696                 extended = 1;
 697         else if (channel == 0)
 698                 extended = (ahc->flags & AHC_EXTENDED_TRANS_A) != 0;
 699         else
 700                 extended = (ahc->flags & AHC_EXTENDED_TRANS_B) != 0;
 701         if (extended && cylinders >= 1024) {
 702                 heads = 255;
 703                 sectors = 63;
 704                 cylinders = aic_sector_div(capacity, heads, sectors);
 705         }
 706         geom[0] = heads;
 707         geom[1] = sectors;
 708         geom[2] = cylinders;
 709         return (0);
 710 }
 711 #endif
 712
 713 /*
 714  * Abort the current SCSI command(s).
 715  */
 716 static int
 717 ahc_linux_abort(struct scsi_cmnd *cmd)
 718 {
 719         int error;
 720
 721         error = ahc_linux_queue_recovery_cmd(cmd, SCB_ABORT);
 722         if (error != 0)
 723                 printf("aic7xxx_abort returns 0x%x\n", error);
 724         return (error);
 725 }
 726
 727 /*
 728  * Attempt to send a target reset message to the device that timed out.
 729  */
 730 static int
 731 ahc_linux_dev_reset(struct scsi_cmnd *cmd)
 732 {
 733         int error;
 734
 735         error = ahc_linux_queue_recovery_cmd(cmd, SCB_DEVICE_RESET);
 736         if (error != 0)
 737                 printf("aic7xxx_dev_reset returns 0x%x\n", error);
 738         return (error);
 739 }
 740
 741 /*
 742  * Reset the SCSI bus.
 743  */
 744 static int
 745 ahc_linux_bus_reset(struct scsi_cmnd *cmd)
 746 {
 747         struct ahc_softc *ahc;
 748         int    found;
 749         unsigned long flags;
 750
 751         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
 752
 753         ahc_lock(ahc, &flags);
 754         found = ahc_reset_channel(ahc, scmd_channel(cmd) + 'A',
 755                                   /*initiate reset*/TRUE);
 756         ahc_unlock(ahc, &flags);
 757
 758         if (bootverbose)
 759                 printf("%s: SCSI bus reset delivered. "
 760                        "%d SCBs aborted.\n", ahc_name(ahc), found);
 761
 762         return SUCCESS;
 763 }
 764
 765 struct scsi_host_template aic7xxx_driver_template = {
 766         .module                 = THIS_MODULE,
 767         .name                   = "aic7xxx",
 768         .proc_name              = "aic7xxx",
 769         .proc_info              = ahc_linux_proc_info,
 770         .info                   = ahc_linux_info,
 771         .queuecommand           = ahc_linux_queue,
 772         .eh_abort_handler       = ahc_linux_abort,
 773         .eh_device_reset_handler = ahc_linux_dev_reset,
 774         .eh_bus_reset_handler   = ahc_linux_bus_reset,
 775 #if defined(__i386__)
 776         .bios_param             = ahc_linux_biosparam,
 777 #endif
 778         .can_queue              = AHC_MAX_QUEUE,
 779         .this_id                = -1,
 780         .cmd_per_lun            = 2,
 781         .use_clustering         = ENABLE_CLUSTERING,
 782         .slave_alloc            = ahc_linux_slave_alloc,
 783         .slave_configure        = ahc_linux_slave_configure,
 784         .slave_destroy          = ahc_linux_slave_destroy,
 785         .target_alloc           = ahc_linux_target_alloc,
 786         .target_destroy         = ahc_linux_target_destroy,
 787 };
 788
 789 /**************************** Tasklet Handler *********************************/
 790
 791 /******************************** Macros **************************************/
 792 #define BUILD_SCSIID(ahc, cmd)                                              \
 793         ((((cmd)->device->id << TID_SHIFT) & TID)                           \
 794         | (((cmd)->device->channel == 0) ? (ahc)->our_id : (ahc)->our_id_b) \
 795         | (((cmd)->device->channel == 0) ? 0 : TWIN_CHNLB))
 796
 797 /******************************** Bus DMA *************************************/
 798 int
 799 ahc_dma_tag_create(struct ahc_softc *ahc, bus_dma_tag_t parent,
 800                    bus_size_t alignment, bus_size_t boundary,
 801                    dma_addr_t lowaddr, dma_addr_t highaddr,
 802                    bus_dma_filter_t *filter, void *filterarg,
 803                    bus_size_t maxsize, int nsegments,
 804                    bus_size_t maxsegsz, int flags, bus_dma_tag_t *ret_tag)
 805 {
 806         bus_dma_tag_t dmat;
 807
 808         dmat = malloc(sizeof(*dmat), M_DEVBUF, M_NOWAIT);
 809         if (dmat == NULL)
 810                 return (ENOMEM);
 811
 812         /*
 813          * Linux is very simplistic about DMA memory.  For now don't
 814          * maintain all specification information.  Once Linux supplies
 815          * better facilities for doing these operations, or the
 816          * needs of this particular driver change, we might need to do
 817          * more here.
 818          */
 819         dmat->alignment = alignment;
 820         dmat->boundary = boundary;
 821         dmat->maxsize = maxsize;
 822         *ret_tag = dmat;
 823         return (0);
 824 }
 825
 826 void
 827 ahc_dma_tag_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat)
 828 {
 829         free(dmat, M_DEVBUF);
 830 }
 831
 832 int
 833 ahc_dmamem_alloc(struct ahc_softc *ahc, bus_dma_tag_t dmat, void** vaddr,
 834                  int flags, bus_dmamap_t *mapp)
 835 {
 836         *vaddr = pci_alloc_consistent(ahc->dev_softc,
 837                                       dmat->maxsize, mapp);
 838         if (*vaddr == NULL)
 839                 return ENOMEM;
 840         return 0;
 841 }
 842
 843 void
 844 ahc_dmamem_free(struct ahc_softc *ahc, bus_dma_tag_t dmat,
 845                 void* vaddr, bus_dmamap_t map)
 846 {
 847         pci_free_consistent(ahc->dev_softc, dmat->maxsize,
 848                             vaddr, map);
 849 }
 850
 851 int
 852 ahc_dmamap_load(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map,
 853                 void *buf, bus_size_t buflen, bus_dmamap_callback_t *cb,
 854                 void *cb_arg, int flags)
 855 {
 856         /*
 857          * Assume for now that this will only be used during
 858          * initialization and not for per-transaction buffer mapping.
 859          */
 860         bus_dma_segment_t stack_sg;
 861
 862         stack_sg.ds_addr = map;
 863         stack_sg.ds_len = dmat->maxsize;
 864         cb(cb_arg, &stack_sg, /*nseg*/1, /*error*/0);
 865         return (0);
 866 }
 867
 868 void
 869 ahc_dmamap_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
 870 {
 871 }
 872
 873 int
 874 ahc_dmamap_unload(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
 875 {
 876         /* Nothing to do */
 877         return (0);
 878 }
 879
 880 static void
 881 ahc_linux_setup_tag_info_global(char *p)
 882 {
 883         int tags, i, j;
 884
 885         tags = simple_strtoul(p + 1, NULL, 0) & 0xff;
 886         printf("Setting Global Tags= %d\n", tags);
 887
 888         for (i = 0; i < ARRAY_SIZE(aic7xxx_tag_info); i++) {
 889                 for (j = 0; j < AHC_NUM_TARGETS; j++) {
 890                         aic7xxx_tag_info[i].tag_commands[j] = tags;
 891                 }
 892         }
 893 }
 894
 895 static void
 896 ahc_linux_setup_tag_info(u_long arg, int instance, int targ, int32_t value)
 897 {
 898
 899         if ((instance >= 0) && (targ >= 0)
 900          && (instance < ARRAY_SIZE(aic7xxx_tag_info))
 901          && (targ < AHC_NUM_TARGETS)) {
 902                 aic7xxx_tag_info[instance].tag_commands[targ] = value & 0xff;
 903                 if (bootverbose)
 904                         printf("tag_info[%d:%d] = %d\n", instance, targ, value);
 905         }
 906 }
 907
 908 static char *
 909 ahc_parse_brace_option(char *opt_name, char *opt_arg, char *end, int depth,
 910                        void (*callback)(u_long, int, int, int32_t),
 911                        u_long callback_arg)
 912 {
 913         char    *tok_end;
 914         char    *tok_end2;
 915         int      i;
 916         int      instance;
 917         int      targ;
 918         int      done;
 919         char     tok_list[] = {'.', ',', '{', '}', '\0'};
 920
 921         /* All options use a ':' name/arg separator */
 922         if (*opt_arg != ':')
 923                 return (opt_arg);
 924         opt_arg++;
 925         instance = -1;
 926         targ = -1;
 927         done = FALSE;
 928         /*
 929          * Restore separator that may be in
 930          * the middle of our option argument.
 931          */
 932         tok_end = strchr(opt_arg, '\0');
 933         if (tok_end < end)
 934                 *tok_end = ',';
 935         while (!done) {
 936                 switch (*opt_arg) {
 937                 case '{':
 938                         if (instance == -1) {
 939                                 instance = 0;
 940                         } else {
 941                                 if (depth > 1) {
 942                                         if (targ == -1)
 943                                                 targ = 0;
 944                                 } else {
 945                                         printf("Malformed Option %s\n",
 946                                                opt_name);
 947                                         done = TRUE;
 948                                 }
 949                         }
 950                         opt_arg++;
 951                         break;
 952                 case '}':
 953                         if (targ != -1)
 954                                 targ = -1;
 955                         else if (instance != -1)
 956                                 instance = -1;
 957                         opt_arg++;
 958                         break;
 959                 case ',':
 960                 case '.':
 961                         if (instance == -1)
 962                                 done = TRUE;
 963                         else if (targ >= 0)
 964                                 targ++;
 965                         else if (instance >= 0)
 966                                 instance++;
 967                         opt_arg++;
 968                         break;
 969                 case '\0':
 970                         done = TRUE;
 971                         break;
 972                 default:
 973                         tok_end = end;
 974                         for (i = 0; tok_list[i]; i++) {
 975                                 tok_end2 = strchr(opt_arg, tok_list[i]);
 976                                 if ((tok_end2) && (tok_end2 < tok_end))
 977                                         tok_end = tok_end2;
 978                         }
 979                         callback(callback_arg, instance, targ,
 980                                  simple_strtol(opt_arg, NULL, 0));
 981                         opt_arg = tok_end;
 982                         break;
 983                 }
 984         }
 985         return (opt_arg);
 986 }
 987
 988 /*
 989  * Handle Linux boot parameters. This routine allows for assigning a value
 990  * to a parameter with a ':' between the parameter and the value.
 991  * ie. aic7xxx=stpwlev:1,extended
 992  */
 993 static int
 994 aic7xxx_setup(char *s)
 995 {
 996         int     i, n;
 997         char   *p;
 998         char   *end;
 999
1000         static struct {
1001                 const char *name;
1002                 uint32_t *flag;
1003         } options[] = {
1004                 { "extended", &aic7xxx_extended },
1005                 { "no_reset", &aic7xxx_no_reset },
1006                 { "verbose", &aic7xxx_verbose },
1007                 { "allow_memio", &aic7xxx_allow_memio},
1008 #ifdef AHC_DEBUG
1009                 { "debug", &ahc_debug },
1010 #endif
1011                 { "periodic_otag", &aic7xxx_periodic_otag },
1012                 { "pci_parity", &aic7xxx_pci_parity },
1013                 { "seltime", &aic7xxx_seltime },
1014                 { "tag_info", NULL },
1015                 { "global_tag_depth", NULL },
1016                 { "dv", NULL }
1017         };
1018
1019         end = strchr(s, '\0');
1020
1021         /*
1022          * XXX ia64 gcc isn't smart enough to know that ARRAY_SIZE
1023          * will never be 0 in this case.
1024          */
1025         n = 0;
1026
1027         while ((p = strsep(&s, ",.")) != NULL) {
1028                 if (*p == '\0')
1029                         continue;
1030                 for (i = 0; i < ARRAY_SIZE(options); i++) {
1031
1032                         n = strlen(options[i].name);
1033                         if (strncmp(options[i].name, p, n) == 0)
1034                                 break;
1035                 }
1036                 if (i == ARRAY_SIZE(options))
1037                         continue;
1038
1039                 if (strncmp(p, "global_tag_depth", n) == 0) {
1040                         ahc_linux_setup_tag_info_global(p + n);
1041                 } else if (strncmp(p, "tag_info", n) == 0) {
1042                         s = ahc_parse_brace_option("tag_info", p + n, end,
1043                             2, ahc_linux_setup_tag_info, 0);
1044                 } else if (p[n] == ':') {
1045                         *(options[i].flag) = simple_strtoul(p + n + 1, NULL, 0);
1046                 } else if (strncmp(p, "verbose", n) == 0) {
1047                         *(options[i].flag) = 1;
1048                 } else {
1049                         *(options[i].flag) ^= 0xFFFFFFFF;
1050                 }
1051         }
1052         return 1;
1053 }
1054
1055 __setup("aic7xxx=", aic7xxx_setup);
1056
1057 uint32_t aic7xxx_verbose;
1058
1059 int
1060 ahc_linux_register_host(struct ahc_softc *ahc, struct scsi_host_template *template)
1061 {
1062         char    buf[80];
1063         struct  Scsi_Host *host;
1064         char    *new_name;
1065         u_long  s;
1066         int     retval;
1067
1068         template->name = ahc->description;
1069         host = scsi_host_alloc(template, sizeof(struct ahc_softc *));
1070         if (host == NULL)
1071                 return (ENOMEM);
1072
1073         *((struct ahc_softc **)host->hostdata) = ahc;
1074         ahc->platform_data->host = host;
1075         host->can_queue = AHC_MAX_QUEUE;
1076         host->cmd_per_lun = 2;
1077         /* XXX No way to communicate the ID for multiple channels */
1078         host->this_id = ahc->our_id;
1079         host->irq = ahc->platform_data->irq;
1080         host->max_id = (ahc->features & AHC_WIDE) ? 16 : 8;
1081         host->max_lun = AHC_NUM_LUNS;
1082         host->max_channel = (ahc->features & AHC_TWIN) ? 1 : 0;
1083         host->sg_tablesize = AHC_NSEG;
1084         ahc_lock(ahc, &s);
1085         ahc_set_unit(ahc, ahc_linux_unit++);
1086         ahc_unlock(ahc, &s);
1087         sprintf(buf, "scsi%d", host->host_no);
1088         new_name = malloc(strlen(buf) + 1, M_DEVBUF, M_NOWAIT);
1089         if (new_name != NULL) {
1090                 strcpy(new_name, buf);
1091                 ahc_set_name(ahc, new_name);
1092         }
1093         host->unique_id = ahc->unit;
1094         ahc_linux_initialize_scsi_bus(ahc);
1095         ahc_intr_enable(ahc, TRUE);
1096
1097         host->transportt = ahc_linux_transport_template;
1098
1099         retval = scsi_add_host(host,
1100                         (ahc->dev_softc ? &ahc->dev_softc->dev : NULL));
1101         if (retval) {
1102                 printk(KERN_WARNING "aic7xxx: scsi_add_host failed\n");
1103                 scsi_host_put(host);
1104                 return retval;
1105         }
1106
1107         scsi_scan_host(host);
1108         return 0;
1109 }
1110
1111 /*
1112  * Place the SCSI bus into a known state by either resetting it,
1113  * or forcing transfer negotiations on the next command to any
1114  * target.
1115  */
1116 void
1117 ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc)
1118 {
1119         int i;
1120         int numtarg;
1121         unsigned long s;
1122
1123         i = 0;
1124         numtarg = 0;
1125
1126         ahc_lock(ahc, &s);
1127
1128         if (aic7xxx_no_reset != 0)
1129                 ahc->flags &= ~(AHC_RESET_BUS_A|AHC_RESET_BUS_B);
1130
1131         if ((ahc->flags & AHC_RESET_BUS_A) != 0)
1132                 ahc_reset_channel(ahc, 'A', /*initiate_reset*/TRUE);
1133         else
1134                 numtarg = (ahc->features & AHC_WIDE) ? 16 : 8;
1135
1136         if ((ahc->features & AHC_TWIN) != 0) {
1137
1138                 if ((ahc->flags & AHC_RESET_BUS_B) != 0) {
1139                         ahc_reset_channel(ahc, 'B', /*initiate_reset*/TRUE);
1140                 } else {
1141                         if (numtarg == 0)
1142                                 i = 8;
1143                         numtarg += 8;
1144                 }
1145         }
1146
1147         /*
1148          * Force negotiation to async for all targets that
1149          * will not see an initial bus reset.
1150          */
1151         for (; i < numtarg; i++) {
1152                 struct ahc_devinfo devinfo;
1153                 struct ahc_initiator_tinfo *tinfo;
1154                 struct ahc_tmode_tstate *tstate;
1155                 u_int our_id;
1156                 u_int target_id;
1157                 char channel;
1158
1159                 channel = 'A';
1160                 our_id = ahc->our_id;
1161                 target_id = i;
1162                 if (i > 7 && (ahc->features & AHC_TWIN) != 0) {
1163                         channel = 'B';
1164                         our_id = ahc->our_id_b;
1165                         target_id = i % 8;
1166                 }
1167                 tinfo = ahc_fetch_transinfo(ahc, channel, our_id,
1168                                             target_id, &tstate);
1169                 ahc_compile_devinfo(&devinfo, our_id, target_id,
1170                                     CAM_LUN_WILDCARD, channel, ROLE_INITIATOR);
1171                 ahc_update_neg_request(ahc, &devinfo, tstate,
1172                                        tinfo, AHC_NEG_ALWAYS);
1173         }
1174         ahc_unlock(ahc, &s);
1175         /* Give the bus some time to recover */
1176         if ((ahc->flags & (AHC_RESET_BUS_A|AHC_RESET_BUS_B)) != 0) {
1177                 ahc_linux_freeze_simq(ahc);
1178                 msleep(AIC7XXX_RESET_DELAY);
1179                 ahc_linux_release_simq(ahc);
1180         }
1181 }
1182
1183 int
1184 ahc_platform_alloc(struct ahc_softc *ahc, void *platform_arg)
1185 {
1186
1187         ahc->platform_data =
1188             malloc(sizeof(struct ahc_platform_data), M_DEVBUF, M_NOWAIT);
1189         if (ahc->platform_data == NULL)
1190                 return (ENOMEM);
1191         memset(ahc->platform_data, 0, sizeof(struct ahc_platform_data));
1192         ahc->platform_data->irq = AHC_LINUX_NOIRQ;
1193         ahc_lockinit(ahc);
1194         ahc->seltime = (aic7xxx_seltime & 0x3) << 4;
1195         ahc->seltime_b = (aic7xxx_seltime & 0x3) << 4;
1196         if (aic7xxx_pci_parity == 0)
1197                 ahc->flags |= AHC_DISABLE_PCI_PERR;
1198
1199         return (0);
1200 }
1201
1202 void
1203 ahc_platform_free(struct ahc_softc *ahc)
1204 {
1205         struct scsi_target *starget;
1206         int i, j;
1207
1208         if (ahc->platform_data != NULL) {
1209                 /* destroy all of the device and target objects */
1210                 for (i = 0; i < AHC_NUM_TARGETS; i++) {
1211                         starget = ahc->platform_data->starget[i];
1212                         if (starget != NULL) {
1213                                 for (j = 0; j < AHC_NUM_LUNS; j++) {
1214                                         struct ahc_linux_target *targ =
1215                                                 scsi_transport_target_data(starget);
1216
1217                                         if (targ->sdev[j] == NULL)
1218                                                 continue;
1219                                         targ->sdev[j] = NULL;
1220                                 }
1221                                 ahc->platform_data->starget[i] = NULL;
1222                         }
1223                 }
1224
1225                 if (ahc->platform_data->irq != AHC_LINUX_NOIRQ)
1226                         free_irq(ahc->platform_data->irq, ahc);
1227                 if (ahc->tag == BUS_SPACE_PIO
1228                  && ahc->bsh.ioport != 0)
1229                         release_region(ahc->bsh.ioport, 256);
1230                 if (ahc->tag == BUS_SPACE_MEMIO
1231                  && ahc->bsh.maddr != NULL) {
1232                         iounmap(ahc->bsh.maddr);
1233                         release_mem_region(ahc->platform_data->mem_busaddr,
1234                                            0x1000);
1235                 }
1236
1237                 if (ahc->platform_data->host)
1238                         scsi_host_put(ahc->platform_data->host);
1239
1240                 free(ahc->platform_data, M_DEVBUF);
1241         }
1242 }
1243
1244 void
1245 ahc_platform_freeze_devq(struct ahc_softc *ahc, struct scb *scb)
1246 {
1247         ahc_platform_abort_scbs(ahc, SCB_GET_TARGET(ahc, scb),
1248                                 SCB_GET_CHANNEL(ahc, scb),
1249                                 SCB_GET_LUN(scb), SCB_LIST_NULL,
1250                                 ROLE_UNKNOWN, CAM_REQUEUE_REQ);
1251 }
1252
1253 void
1254 ahc_platform_set_tags(struct ahc_softc *ahc, struct ahc_devinfo *devinfo,
1255                       ahc_queue_alg alg)
1256 {
1257         struct scsi_target *starget;
1258         struct ahc_linux_target *targ;
1259         struct ahc_linux_device *dev;
1260         struct scsi_device *sdev;
1261         u_int target_offset;
1262         int was_queuing;
1263         int now_queuing;
1264
1265         target_offset = devinfo->target;
1266         if (devinfo->channel != 'A')
1267                 target_offset += 8;
1268         starget = ahc->platform_data->starget[target_offset];
1269         targ = scsi_transport_target_data(starget);
1270         BUG_ON(targ == NULL);
1271         sdev = targ->sdev[devinfo->lun];
1272         if (sdev == NULL)
1273                 return;
1274         dev = scsi_transport_device_data(sdev);
1275
1276         was_queuing = dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED);
1277         switch (alg) {
1278         default:
1279         case AHC_QUEUE_NONE:
1280                 now_queuing = 0;
1281                 break;
1282         case AHC_QUEUE_BASIC:
1283                 now_queuing = AHC_DEV_Q_BASIC;
1284                 break;
1285         case AHC_QUEUE_TAGGED:
1286                 now_queuing = AHC_DEV_Q_TAGGED;
1287                 break;
1288         }
1289         if ((dev->flags & AHC_DEV_FREEZE_TIL_EMPTY) == 0
1290          && (was_queuing != now_queuing)
1291          && (dev->active != 0)) {
1292                 dev->flags |= AHC_DEV_FREEZE_TIL_EMPTY;
1293                 dev->qfrozen++;
1294         }
1295
1296         dev->flags &= ~(AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED|AHC_DEV_PERIODIC_OTAG);
1297         if (now_queuing) {
1298                 u_int usertags;
1299
1300                 usertags = ahc_linux_user_tagdepth(ahc, devinfo);
1301                 if (!was_queuing) {
1302                         /*
1303                          * Start out agressively and allow our
1304                          * dynamic queue depth algorithm to take
1305                          * care of the rest.
1306                          */
1307                         dev->maxtags = usertags;
1308                         dev->openings = dev->maxtags - dev->active;
1309                 }
1310                 if (dev->maxtags == 0) {
1311                         /*
1312                          * Queueing is disabled by the user.
1313                          */
1314                         dev->openings = 1;
1315                 } else if (alg == AHC_QUEUE_TAGGED) {
1316                         dev->flags |= AHC_DEV_Q_TAGGED;
1317                         if (aic7xxx_periodic_otag != 0)
1318                                 dev->flags |= AHC_DEV_PERIODIC_OTAG;
1319                 } else
1320                         dev->flags |= AHC_DEV_Q_BASIC;
1321         } else {
1322                 /* We can only have one opening. */
1323                 dev->maxtags = 0;
1324                 dev->openings =  1 - dev->active;
1325         }
1326         switch ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED))) {
1327         case AHC_DEV_Q_BASIC:
1328                 scsi_set_tag_type(sdev, MSG_SIMPLE_TAG);
1329                 scsi_activate_tcq(sdev, dev->openings + dev->active);
1330                 break;
1331         case AHC_DEV_Q_TAGGED:
1332                 scsi_set_tag_type(sdev, MSG_ORDERED_TAG);
1333                 scsi_activate_tcq(sdev, dev->openings + dev->active);
1334                 break;
1335         default:
1336                 /*
1337                  * We allow the OS to queue 2 untagged transactions to
1338                  * us at any time even though we can only execute them
1339                  * serially on the controller/device.  This should
1340                  * remove some latency.
1341                  */
1342                 scsi_deactivate_tcq(sdev, 2);
1343                 break;
1344         }
1345 }
1346
1347 int
1348 ahc_platform_abort_scbs(struct ahc_softc *ahc, int target, char channel,
1349                         int lun, u_int tag, role_t role, uint32_t status)
1350 {
1351         return 0;
1352 }
1353
1354 static u_int
1355 ahc_linux_user_tagdepth(struct ahc_softc *ahc, struct ahc_devinfo *devinfo)
1356 {
1357         static int warned_user;
1358         u_int tags;
1359
1360         tags = 0;
1361         if ((ahc->user_discenable & devinfo->target_mask) != 0) {
1362                 if (ahc->unit >= ARRAY_SIZE(aic7xxx_tag_info)) {
1363                         if (warned_user == 0) {
1364
1365                                 printf(KERN_WARNING
1366 "aic7xxx: WARNING: Insufficient tag_info instances\n"
1367 "aic7xxx: for installed controllers. Using defaults\n"
1368 "aic7xxx: Please update the aic7xxx_tag_info array in\n"
1369 "aic7xxx: the aic7xxx_osm..c source file.\n");
1370                                 warned_user++;
1371                         }
1372                         tags = AHC_MAX_QUEUE;
1373                 } else {
1374                         adapter_tag_info_t *tag_info;
1375
1376                         tag_info = &aic7xxx_tag_info[ahc->unit];
1377                         tags = tag_info->tag_commands[devinfo->target_offset];
1378                         if (tags > AHC_MAX_QUEUE)
1379                                 tags = AHC_MAX_QUEUE;
1380                 }
1381         }
1382         return (tags);
1383 }
1384
1385 /*
1386  * Determines the queue depth for a given device.
1387  */
1388 static void
1389 ahc_linux_device_queue_depth(struct scsi_device *sdev)
1390 {
1391         struct  ahc_devinfo devinfo;
1392         u_int   tags;
1393         struct ahc_softc *ahc = *((struct ahc_softc **)sdev->host->hostdata);
1394
1395         ahc_compile_devinfo(&devinfo,
1396                             sdev->sdev_target->channel == 0
1397                           ? ahc->our_id : ahc->our_id_b,
1398                             sdev->sdev_target->id, sdev->lun,
1399                             sdev->sdev_target->channel == 0 ? 'A' : 'B',
1400                             ROLE_INITIATOR);
1401         tags = ahc_linux_user_tagdepth(ahc, &devinfo);
1402         if (tags != 0 && sdev->tagged_supported != 0) {
1403
1404                 ahc_set_tags(ahc, &devinfo, AHC_QUEUE_TAGGED);
1405                 ahc_print_devinfo(ahc, &devinfo);
1406                 printf("Tagged Queuing enabled.  Depth %d\n", tags);
1407         } else {
1408                 ahc_set_tags(ahc, &devinfo, AHC_QUEUE_NONE);
1409         }
1410 }
1411
1412 static int
1413 ahc_linux_run_command(struct ahc_softc *ahc, struct ahc_linux_device *dev,
1414                       struct scsi_cmnd *cmd)
1415 {
1416         struct   scb *scb;
1417         struct   hardware_scb *hscb;
1418         struct   ahc_initiator_tinfo *tinfo;
1419         struct   ahc_tmode_tstate *tstate;
1420         uint16_t mask;
1421         struct scb_tailq *untagged_q = NULL;
1422
1423         /*
1424          * Schedule us to run later.  The only reason we are not
1425          * running is because the whole controller Q is frozen.
1426          */
1427         if (ahc->platform_data->qfrozen != 0)
1428                 return SCSI_MLQUEUE_HOST_BUSY;
1429
1430         /*
1431          * We only allow one untagged transaction
1432          * per target in the initiator role unless
1433          * we are storing a full busy target *lun*
1434          * table in SCB space.
1435          */
1436         if (!blk_rq_tagged(cmd->request)
1437             && (ahc->features & AHC_SCB_BTT) == 0) {
1438                 int target_offset;
1439
1440                 target_offset = cmd->device->id + cmd->device->channel * 8;
1441                 untagged_q = &(ahc->untagged_queues[target_offset]);
1442                 if (!TAILQ_EMPTY(untagged_q))
1443                         /* if we're already executing an untagged command
1444                          * we're busy to another */
1445                         return SCSI_MLQUEUE_DEVICE_BUSY;
1446         }
1447
1448         /*
1449          * Get an scb to use.
1450          */
1451         scb = ahc_get_scb(ahc);
1452         if (!scb)
1453                 return SCSI_MLQUEUE_HOST_BUSY;
1454
1455         scb->io_ctx = cmd;
1456         scb->platform_data->dev = dev;
1457         hscb = scb->hscb;
1458         cmd->host_scribble = (char *)scb;
1459
1460         /*
1461          * Fill out basics of the HSCB.
1462          */
1463         hscb->control = 0;
1464         hscb->scsiid = BUILD_SCSIID(ahc, cmd);
1465         hscb->lun = cmd->device->lun;
1466         mask = SCB_GET_TARGET_MASK(ahc, scb);
1467         tinfo = ahc_fetch_transinfo(ahc, SCB_GET_CHANNEL(ahc, scb),
1468                                     SCB_GET_OUR_ID(scb),
1469                                     SCB_GET_TARGET(ahc, scb), &tstate);
1470         hscb->scsirate = tinfo->scsirate;
1471         hscb->scsioffset = tinfo->curr.offset;
1472         if ((tstate->ultraenb & mask) != 0)
1473                 hscb->control |= ULTRAENB;
1474
1475         if ((ahc->user_discenable & mask) != 0)
1476                 hscb->control |= DISCENB;
1477
1478         if ((tstate->auto_negotiate & mask) != 0) {
1479                 scb->flags |= SCB_AUTO_NEGOTIATE;
1480                 scb->hscb->control |= MK_MESSAGE;
1481         }
1482
1483         if ((dev->flags & (AHC_DEV_Q_TAGGED|AHC_DEV_Q_BASIC)) != 0) {
1484                 int     msg_bytes;
1485                 uint8_t tag_msgs[2];
1486
1487                 msg_bytes = scsi_populate_tag_msg(cmd, tag_msgs);
1488                 if (msg_bytes && tag_msgs[0] != MSG_SIMPLE_TASK) {
1489                         hscb->control |= tag_msgs[0];
1490                         if (tag_msgs[0] == MSG_ORDERED_TASK)
1491                                 dev->commands_since_idle_or_otag = 0;
1492                 } else if (dev->commands_since_idle_or_otag == AHC_OTAG_THRESH
1493                                 && (dev->flags & AHC_DEV_Q_TAGGED) != 0) {
1494                         hscb->control |= MSG_ORDERED_TASK;
1495                         dev->commands_since_idle_or_otag = 0;
1496                 } else {
1497                         hscb->control |= MSG_SIMPLE_TASK;
1498                 }
1499         }
1500
1501         hscb->cdb_len = cmd->cmd_len;
1502         if (hscb->cdb_len <= 12) {
1503                 memcpy(hscb->shared_data.cdb, cmd->cmnd, hscb->cdb_len);
1504         } else {
1505                 memcpy(hscb->cdb32, cmd->cmnd, hscb->cdb_len);
1506                 scb->flags |= SCB_CDB32_PTR;
1507         }
1508
1509         scb->platform_data->xfer_len = 0;
1510         ahc_set_residual(scb, 0);
1511         ahc_set_sense_residual(scb, 0);
1512         scb->sg_count = 0;
1513         if (cmd->use_sg != 0) {
1514                 struct  ahc_dma_seg *sg;
1515                 struct  scatterlist *cur_seg;
1516                 struct  scatterlist *end_seg;
1517                 int     nseg;
1518
1519                 cur_seg = (struct scatterlist *)cmd->request_buffer;
1520                 nseg = pci_map_sg(ahc->dev_softc, cur_seg, cmd->use_sg,
1521                                   cmd->sc_data_direction);
1522                 end_seg = cur_seg + nseg;
1523                 /* Copy the segments into the SG list. */
1524                 sg = scb->sg_list;
1525                 /*
1526                  * The sg_count may be larger than nseg if
1527                  * a transfer crosses a 32bit page.
1528                  */
1529                 while (cur_seg < end_seg) {
1530                         dma_addr_t addr;
1531                         bus_size_t len;
1532                         int consumed;
1533
1534                         addr = sg_dma_address(cur_seg);
1535                         len = sg_dma_len(cur_seg);
1536                         consumed = ahc_linux_map_seg(ahc, scb,
1537                                                      sg, addr, len);
1538                         sg += consumed;
1539                         scb->sg_count += consumed;
1540                         cur_seg++;
1541                 }
1542                 sg--;
1543                 sg->len |= ahc_htole32(AHC_DMA_LAST_SEG);
1544
1545                 /*
1546                  * Reset the sg list pointer.
1547                  */
1548                 scb->hscb->sgptr =
1549                         ahc_htole32(scb->sg_list_phys | SG_FULL_RESID);
1550
1551                 /*
1552                  * Copy the first SG into the "current"
1553                  * data pointer area.
1554                  */
1555                 scb->hscb->dataptr = scb->sg_list->addr;
1556                 scb->hscb->datacnt = scb->sg_list->len;
1557         } else if (cmd->request_bufflen != 0) {
1558                 struct   ahc_dma_seg *sg;
1559                 dma_addr_t addr;
1560
1561                 sg = scb->sg_list;
1562                 addr = pci_map_single(ahc->dev_softc,
1563                                       cmd->request_buffer,
1564                                       cmd->request_bufflen,
1565                                       cmd->sc_data_direction);
1566                 scb->platform_data->buf_busaddr = addr;
1567                 scb->sg_count = ahc_linux_map_seg(ahc, scb,
1568                                                   sg, addr,
1569                                                   cmd->request_bufflen);
1570                 sg->len |= ahc_htole32(AHC_DMA_LAST_SEG);
1571
1572                 /*
1573                  * Reset the sg list pointer.
1574                  */
1575                 scb->hscb->sgptr =
1576                         ahc_htole32(scb->sg_list_phys | SG_FULL_RESID);
1577
1578                 /*
1579                  * Copy the first SG into the "current"
1580                  * data pointer area.
1581                  */
1582                 scb->hscb->dataptr = sg->addr;
1583                 scb->hscb->datacnt = sg->len;
1584         } else {
1585                 scb->hscb->sgptr = ahc_htole32(SG_LIST_NULL);
1586                 scb->hscb->dataptr = 0;
1587                 scb->hscb->datacnt = 0;
1588                 scb->sg_count = 0;
1589         }
1590
1591         LIST_INSERT_HEAD(&ahc->pending_scbs, scb, pending_links);
1592         dev->openings--;
1593         dev->active++;
1594         dev->commands_issued++;
1595         if ((dev->flags & AHC_DEV_PERIODIC_OTAG) != 0)
1596                 dev->commands_since_idle_or_otag++;
1597
1598         scb->flags |= SCB_ACTIVE;
1599         if (untagged_q) {
1600                 TAILQ_INSERT_TAIL(untagged_q, scb, links.tqe);
1601                 scb->flags |= SCB_UNTAGGEDQ;
1602         }
1603         ahc_queue_scb(ahc, scb);
1604         return 0;
1605 }
1606
1607 /*
1608  * SCSI controller interrupt handler.
1609  */
1610 irqreturn_t
1611 ahc_linux_isr(int irq, void *dev_id, struct pt_regs * regs)
1612 {
1613         struct  ahc_softc *ahc;
1614         u_long  flags;
1615         int     ours;
1616
1617         ahc = (struct ahc_softc *) dev_id;
1618         ahc_lock(ahc, &flags);
1619         ours = ahc_intr(ahc);
1620         ahc_unlock(ahc, &flags);
1621         return IRQ_RETVAL(ours);
1622 }
1623
1624 void
1625 ahc_platform_flushwork(struct ahc_softc *ahc)
1626 {
1627
1628 }
1629
1630 void
1631 ahc_send_async(struct ahc_softc *ahc, char channel,
1632                u_int target, u_int lun, ac_code code, void *arg)
1633 {
1634         switch (code) {
1635         case AC_TRANSFER_NEG:
1636         {
1637                 char    buf[80];
1638                 struct  scsi_target *starget;
1639                 struct  ahc_linux_target *targ;
1640                 struct  info_str info;
1641                 struct  ahc_initiator_tinfo *tinfo;
1642                 struct  ahc_tmode_tstate *tstate;
1643                 int     target_offset;
1644                 unsigned int target_ppr_options;
1645
1646                 BUG_ON(target == CAM_TARGET_WILDCARD);
1647
1648                 info.buffer = buf;
1649                 info.length = sizeof(buf);
1650                 info.offset = 0;
1651                 info.pos = 0;
1652                 tinfo = ahc_fetch_transinfo(ahc, channel,
1653                                                 channel == 'A' ? ahc->our_id
1654                                                                : ahc->our_id_b,
1655                                                 target, &tstate);
1656
1657                 /*
1658                  * Don't bother reporting results while
1659                  * negotiations are still pending.
1660                  */
1661                 if (tinfo->curr.period != tinfo->goal.period
1662                  || tinfo->curr.width != tinfo->goal.width
1663                  || tinfo->curr.offset != tinfo->goal.offset
1664                  || tinfo->curr.ppr_options != tinfo->goal.ppr_options)
1665                         if (bootverbose == 0)
1666                                 break;
1667
1668                 /*
1669                  * Don't bother reporting results that
1670                  * are identical to those last reported.
1671                  */
1672                 target_offset = target;
1673                 if (channel == 'B')
1674                         target_offset += 8;
1675                 starget = ahc->platform_data->starget[target_offset];
1676                 if (starget == NULL)
1677                         break;
1678                 targ = scsi_transport_target_data(starget);
1679
1680                 target_ppr_options =
1681                         (spi_dt(starget) ? MSG_EXT_PPR_DT_REQ : 0)
1682                         + (spi_qas(starget) ? MSG_EXT_PPR_QAS_REQ : 0)
1683                         + (spi_iu(starget) ?  MSG_EXT_PPR_IU_REQ : 0);
1684
1685                 if (tinfo->curr.period == spi_period(starget)
1686                     && tinfo->curr.width == spi_width(starget)
1687                     && tinfo->curr.offset == spi_offset(starget)
1688                  && tinfo->curr.ppr_options == target_ppr_options)
1689                         if (bootverbose == 0)
1690                                 break;
1691
1692                 spi_period(starget) = tinfo->curr.period;
1693                 spi_width(starget) = tinfo->curr.width;
1694                 spi_offset(starget) = tinfo->curr.offset;
1695                 spi_dt(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_DT_REQ ? 1 : 0;
1696                 spi_qas(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_QAS_REQ ? 1 : 0;
1697                 spi_iu(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ ? 1 : 0;
1698                 spi_display_xfer_agreement(starget);
1699                 break;
1700         }
1701         case AC_SENT_BDR:
1702         {
1703                 WARN_ON(lun != CAM_LUN_WILDCARD);
1704                 scsi_report_device_reset(ahc->platform_data->host,
1705                                          channel - 'A', target);
1706                 break;
1707         }
1708         case AC_BUS_RESET:
1709                 if (ahc->platform_data->host != NULL) {
1710                         scsi_report_bus_reset(ahc->platform_data->host,
1711                                               channel - 'A');
1712                 }
1713                 break;
1714         default:
1715                 panic("ahc_send_async: Unexpected async event");
1716         }
1717 }
1718
1719 /*
1720  * Calls the higher level scsi done function and frees the scb.
1721  */
1722 void
1723 ahc_done(struct ahc_softc *ahc, struct scb *scb)
1724 {
1725         struct scsi_cmnd *cmd;
1726         struct     ahc_linux_device *dev;
1727
1728         LIST_REMOVE(scb, pending_links);
1729         if ((scb->flags & SCB_UNTAGGEDQ) != 0) {
1730                 struct scb_tailq *untagged_q;
1731                 int target_offset;
1732
1733                 target_offset = SCB_GET_TARGET_OFFSET(ahc, scb);
1734                 untagged_q = &(ahc->untagged_queues[target_offset]);
1735                 TAILQ_REMOVE(untagged_q, scb, links.tqe);
1736                 BUG_ON(!TAILQ_EMPTY(untagged_q));
1737         }
1738
1739         if ((scb->flags & SCB_ACTIVE) == 0) {
1740                 printf("SCB %d done'd twice\n", scb->hscb->tag);
1741                 ahc_dump_card_state(ahc);
1742                 panic("Stopping for safety");
1743         }
1744         cmd = scb->io_ctx;
1745         dev = scb->platform_data->dev;
1746         dev->active--;
1747         dev->openings++;
1748         if ((cmd->result & (CAM_DEV_QFRZN << 16)) != 0) {
1749                 cmd->result &= ~(CAM_DEV_QFRZN << 16);
1750                 dev->qfrozen--;
1751         }
1752         ahc_linux_unmap_scb(ahc, scb);
1753
1754         /*
1755          * Guard against stale sense data.
1756          * The Linux mid-layer assumes that sense
1757          * was retrieved anytime the first byte of
1758          * the sense buffer looks "sane".
1759          */
1760         cmd->sense_buffer[0] = 0;
1761         if (ahc_get_transaction_status(scb) == CAM_REQ_INPROG) {
1762                 uint32_t amount_xferred;
1763
1764                 amount_xferred =
1765                     ahc_get_transfer_length(scb) - ahc_get_residual(scb);
1766                 if ((scb->flags & SCB_TRANSMISSION_ERROR) != 0) {
1767 #ifdef AHC_DEBUG
1768                         if ((ahc_debug & AHC_SHOW_MISC) != 0) {
1769                                 ahc_print_path(ahc, scb);
1770                                 printf("Set CAM_UNCOR_PARITY\n");
1771                         }
1772 #endif
1773                         ahc_set_transaction_status(scb, CAM_UNCOR_PARITY);
1774 #ifdef AHC_REPORT_UNDERFLOWS
1775                 /*
1776                  * This code is disabled by default as some
1777                  * clients of the SCSI system do not properly
1778                  * initialize the underflow parameter.  This
1779                  * results in spurious termination of commands
1780                  * that complete as expected (e.g. underflow is
1781                  * allowed as command can return variable amounts
1782                  * of data.
1783                  */
1784                 } else if (amount_xferred < scb->io_ctx->underflow) {
1785                         u_int i;
1786
1787                         ahc_print_path(ahc, scb);
1788                         printf("CDB:");
1789                         for (i = 0; i < scb->io_ctx->cmd_len; i++)
1790                                 printf(" 0x%x", scb->io_ctx->cmnd[i]);
1791                         printf("\n");
1792                         ahc_print_path(ahc, scb);
1793                         printf("Saw underflow (%ld of %ld bytes). "
1794                                "Treated as error\n",
1795                                 ahc_get_residual(scb),
1796                                 ahc_get_transfer_length(scb));
1797                         ahc_set_transaction_status(scb, CAM_DATA_RUN_ERR);
1798 #endif
1799                 } else {
1800                         ahc_set_transaction_status(scb, CAM_REQ_CMP);
1801                 }
1802         } else if (ahc_get_transaction_status(scb) == CAM_SCSI_STATUS_ERROR) {
1803                 ahc_linux_handle_scsi_status(ahc, cmd->device, scb);
1804         }
1805
1806         if (dev->openings == 1
1807          && ahc_get_transaction_status(scb) == CAM_REQ_CMP
1808          && ahc_get_scsi_status(scb) != SCSI_STATUS_QUEUE_FULL)
1809                 dev->tag_success_count++;
1810         /*
1811          * Some devices deal with temporary internal resource
1812          * shortages by returning queue full.  When the queue
1813          * full occurrs, we throttle back.  Slowly try to get
1814          * back to our previous queue depth.
1815          */
1816         if ((dev->openings + dev->active) < dev->maxtags
1817          && dev->tag_success_count > AHC_TAG_SUCCESS_INTERVAL) {
1818                 dev->tag_success_count = 0;
1819                 dev->openings++;
1820         }
1821
1822         if (dev->active == 0)
1823                 dev->commands_since_idle_or_otag = 0;
1824
1825         if ((scb->flags & SCB_RECOVERY_SCB) != 0) {
1826                 printf("Recovery SCB completes\n");
1827                 if (ahc_get_transaction_status(scb) == CAM_BDR_SENT
1828                  || ahc_get_transaction_status(scb) == CAM_REQ_ABORTED)
1829                         ahc_set_transaction_status(scb, CAM_CMD_TIMEOUT);
1830
1831                 if (ahc->platform_data->eh_done)
1832                         complete(ahc->platform_data->eh_done);
1833         }
1834
1835         ahc_free_scb(ahc, scb);
1836         ahc_linux_queue_cmd_complete(ahc, cmd);
1837 }
1838
1839 static void
1840 ahc_linux_handle_scsi_status(struct ahc_softc *ahc,
1841                              struct scsi_device *sdev, struct scb *scb)
1842 {
1843         struct  ahc_devinfo devinfo;
1844         struct ahc_linux_device *dev = scsi_transport_device_data(sdev);
1845
1846         ahc_compile_devinfo(&devinfo,
1847                             ahc->our_id,
1848                             sdev->sdev_target->id, sdev->lun,
1849                             sdev->sdev_target->channel == 0 ? 'A' : 'B',
1850                             ROLE_INITIATOR);
1851
1852         /*
1853          * We don't currently trust the mid-layer to
1854          * properly deal with queue full or busy.  So,
1855          * when one occurs, we tell the mid-layer to
1856          * unconditionally requeue the command to us
1857          * so that we can retry it ourselves.  We also
1858          * implement our own throttling mechanism so
1859          * we don't clobber the device with too many
1860          * commands.
1861          */
1862         switch (ahc_get_scsi_status(scb)) {
1863         default:
1864                 break;
1865         case SCSI_STATUS_CHECK_COND:
1866         case SCSI_STATUS_CMD_TERMINATED:
1867         {
1868                 struct scsi_cmnd *cmd;
1869
1870                 /*
1871                  * Copy sense information to the OS's cmd
1872                  * structure if it is available.
1873                  */
1874                 cmd = scb->io_ctx;
1875                 if (scb->flags & SCB_SENSE) {
1876                         u_int sense_size;
1877
1878                         sense_size = MIN(sizeof(struct scsi_sense_data)
1879                                        - ahc_get_sense_residual(scb),
1880                                          sizeof(cmd->sense_buffer));
1881                         memcpy(cmd->sense_buffer,
1882                                ahc_get_sense_buf(ahc, scb), sense_size);
1883                         if (sense_size < sizeof(cmd->sense_buffer))
1884                                 memset(&cmd->sense_buffer[sense_size], 0,
1885                                        sizeof(cmd->sense_buffer) - sense_size);
1886                         cmd->result |= (DRIVER_SENSE << 24);
1887 #ifdef AHC_DEBUG
1888                         if (ahc_debug & AHC_SHOW_SENSE) {
1889                                 int i;
1890
1891                                 printf("Copied %d bytes of sense data:",
1892                                        sense_size);
1893                                 for (i = 0; i < sense_size; i++) {
1894                                         if ((i & 0xF) == 0)
1895                                                 printf("\n");
1896                                         printf("0x%x ", cmd->sense_buffer[i]);
1897                                 }
1898                                 printf("\n");
1899                         }
1900 #endif
1901                 }
1902                 break;
1903         }
1904         case SCSI_STATUS_QUEUE_FULL:
1905         {
1906                 /*
1907                  * By the time the core driver has returned this
1908                  * command, all other commands that were queued
1909                  * to us but not the device have been returned.
1910                  * This ensures that dev->active is equal to
1911                  * the number of commands actually queued to
1912                  * the device.
1913                  */
1914                 dev->tag_success_count = 0;
1915                 if (dev->active != 0) {
1916                         /*
1917                          * Drop our opening count to the number
1918                          * of commands currently outstanding.
1919                          */
1920                         dev->openings = 0;
1921 /*
1922                         ahc_print_path(ahc, scb);
1923                         printf("Dropping tag count to %d\n", dev->active);
1924  */
1925                         if (dev->active == dev->tags_on_last_queuefull) {
1926
1927                                 dev->last_queuefull_same_count++;
1928                                 /*
1929                                  * If we repeatedly see a queue full
1930                                  * at the same queue depth, this
1931                                  * device has a fixed number of tag
1932                                  * slots.  Lock in this tag depth
1933                                  * so we stop seeing queue fulls from
1934                                  * this device.
1935                                  */
1936                                 if (dev->last_queuefull_same_count
1937                                  == AHC_LOCK_TAGS_COUNT) {
1938                                         dev->maxtags = dev->active;
1939                                         ahc_print_path(ahc, scb);
1940                                         printf("Locking max tag count at %d\n",
1941                                                dev->active);
1942                                 }
1943                         } else {
1944                                 dev->tags_on_last_queuefull = dev->active;
1945                                 dev->last_queuefull_same_count = 0;
1946                         }
1947                         ahc_set_transaction_status(scb, CAM_REQUEUE_REQ);
1948                         ahc_set_scsi_status(scb, SCSI_STATUS_OK);
1949                         ahc_platform_set_tags(ahc, &devinfo,
1950                                      (dev->flags & AHC_DEV_Q_BASIC)
1951                                    ? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
1952                         break;
1953                 }
1954                 /*
1955                  * Drop down to a single opening, and treat this
1956                  * as if the target returned BUSY SCSI status.
1957                  */
1958                 dev->openings = 1;
1959                 ahc_set_scsi_status(scb, SCSI_STATUS_BUSY);
1960                 ahc_platform_set_tags(ahc, &devinfo,
1961                              (dev->flags & AHC_DEV_Q_BASIC)
1962                            ? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
1963                 break;
1964         }
1965         }
1966 }
1967
1968 static void
1969 ahc_linux_queue_cmd_complete(struct ahc_softc *ahc, struct scsi_cmnd *cmd)
1970 {
1971         /*
1972          * Map CAM error codes into Linux Error codes.  We
1973          * avoid the conversion so that the DV code has the
1974          * full error information available when making
1975          * state change decisions.
1976          */
1977         {
1978                 u_int new_status;
1979
1980                 switch (ahc_cmd_get_transaction_status(cmd)) {
1981                 case CAM_REQ_INPROG:
1982                 case CAM_REQ_CMP:
1983                 case CAM_SCSI_STATUS_ERROR:
1984                         new_status = DID_OK;
1985                         break;
1986                 case CAM_REQ_ABORTED:
1987                         new_status = DID_ABORT;
1988                         break;
1989                 case CAM_BUSY:
1990                         new_status = DID_BUS_BUSY;
1991                         break;
1992                 case CAM_REQ_INVALID:
1993                 case CAM_PATH_INVALID:
1994                         new_status = DID_BAD_TARGET;
1995                         break;
1996                 case CAM_SEL_TIMEOUT:
1997                         new_status = DID_NO_CONNECT;
1998                         break;
1999                 case CAM_SCSI_BUS_RESET:
2000                 case CAM_BDR_SENT:
2001                         new_status = DID_RESET;
2002                         break;
2003                 case CAM_UNCOR_PARITY:
2004                         new_status = DID_PARITY;
2005                         break;
2006                 case CAM_CMD_TIMEOUT:
2007                         new_status = DID_TIME_OUT;
2008                         break;
2009                 case CAM_UA_ABORT:
2010                 case CAM_REQ_CMP_ERR:
2011                 case CAM_AUTOSENSE_FAIL:
2012                 case CAM_NO_HBA:
2013                 case CAM_DATA_RUN_ERR:
2014                 case CAM_UNEXP_BUSFREE:
2015                 case CAM_SEQUENCE_FAIL:
2016                 case CAM_CCB_LEN_ERR:
2017                 case CAM_PROVIDE_FAIL:
2018                 case CAM_REQ_TERMIO:
2019                 case CAM_UNREC_HBA_ERROR:
2020                 case CAM_REQ_TOO_BIG:
2021                         new_status = DID_ERROR;
2022                         break;
2023                 case CAM_REQUEUE_REQ:
2024                         new_status = DID_REQUEUE;
2025                         break;
2026                 default:
2027                         /* We should never get here */
2028                         new_status = DID_ERROR;
2029                         break;
2030                 }
2031
2032                 ahc_cmd_set_transaction_status(cmd, new_status);
2033         }
2034
2035         cmd->scsi_done(cmd);
2036 }
2037
2038 static void
2039 ahc_linux_freeze_simq(struct ahc_softc *ahc)
2040 {
2041         unsigned long s;
2042
2043         ahc_lock(ahc, &s);
2044         ahc->platform_data->qfrozen++;
2045         if (ahc->platform_data->qfrozen == 1) {
2046                 scsi_block_requests(ahc->platform_data->host);
2047
2048                 /* XXX What about Twin channels? */
2049                 ahc_platform_abort_scbs(ahc, CAM_TARGET_WILDCARD, ALL_CHANNELS,
2050                                         CAM_LUN_WILDCARD, SCB_LIST_NULL,
2051                                         ROLE_INITIATOR, CAM_REQUEUE_REQ);
2052         }
2053         ahc_unlock(ahc, &s);
2054 }
2055
2056 static void
2057 ahc_linux_release_simq(struct ahc_softc *ahc)
2058 {
2059         u_long s;
2060         int    unblock_reqs;
2061
2062         unblock_reqs = 0;
2063         ahc_lock(ahc, &s);
2064         if (ahc->platform_data->qfrozen > 0)
2065                 ahc->platform_data->qfrozen--;
2066         if (ahc->platform_data->qfrozen == 0)
2067                 unblock_reqs = 1;
2068         ahc_unlock(ahc, &s);
2069         /*
2070          * There is still a race here.  The mid-layer
2071          * should keep its own freeze count and use
2072          * a bottom half handler to run the queues
2073          * so we can unblock with our own lock held.
2074          */
2075         if (unblock_reqs)
2076                 scsi_unblock_requests(ahc->platform_data->host);
2077 }
2078
2079 static int
2080 ahc_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag)
2081 {
2082         struct ahc_softc *ahc;
2083         struct ahc_linux_device *dev;
2084         struct scb *pending_scb;
2085         u_int  saved_scbptr;
2086         u_int  active_scb_index;
2087         u_int  last_phase;
2088         u_int  saved_scsiid;
2089         u_int  cdb_byte;
2090         int    retval;
2091         int    was_paused;
2092         int    paused;
2093         int    wait;
2094         int    disconnected;
2095         unsigned long flags;
2096
2097         pending_scb = NULL;
2098         paused = FALSE;
2099         wait = FALSE;
2100         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
2101
2102         scmd_printk(KERN_INFO, cmd, "Attempting to queue a%s message\n",
2103                flag == SCB_ABORT ? "n ABORT" : " TARGET RESET");
2104
2105         printf("CDB:");
2106         for (cdb_byte = 0; cdb_byte < cmd->cmd_len; cdb_byte++)
2107                 printf(" 0x%x", cmd->cmnd[cdb_byte]);
2108         printf("\n");
2109
2110         ahc_lock(ahc, &flags);
2111
2112         /*
2113          * First determine if we currently own this command.
2114          * Start by searching the device queue.  If not found
2115          * there, check the pending_scb list.  If not found
2116          * at all, and the system wanted us to just abort the
2117          * command, return success.
2118          */
2119         dev = scsi_transport_device_data(cmd->device);
2120
2121         if (dev == NULL) {
2122                 /*
2123                  * No target device for this command exists,
2124                  * so we must not still own the command.
2125                  */
2126                 printf("%s:%d:%d:%d: Is not an active device\n",
2127                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2128                        cmd->device->lun);
2129                 retval = SUCCESS;
2130                 goto no_cmd;
2131         }
2132
2133         if ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED)) == 0
2134          && ahc_search_untagged_queues(ahc, cmd, cmd->device->id,
2135                                        cmd->device->channel + 'A',
2136                                        cmd->device->lun,
2137                                        CAM_REQ_ABORTED, SEARCH_COMPLETE) != 0) {
2138                 printf("%s:%d:%d:%d: Command found on untagged queue\n",
2139                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2140                        cmd->device->lun);
2141                 retval = SUCCESS;
2142                 goto done;
2143         }
2144
2145         /*
2146          * See if we can find a matching cmd in the pending list.
2147          */
2148         LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
2149                 if (pending_scb->io_ctx == cmd)
2150                         break;
2151         }
2152
2153         if (pending_scb == NULL && flag == SCB_DEVICE_RESET) {
2154
2155                 /* Any SCB for this device will do for a target reset */
2156                 LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
2157                         if (ahc_match_scb(ahc, pending_scb, scmd_id(cmd),
2158                                           scmd_channel(cmd) + 'A',
2159                                           CAM_LUN_WILDCARD,
2160                                           SCB_LIST_NULL, ROLE_INITIATOR))
2161                                 break;
2162                 }
2163         }
2164
2165         if (pending_scb == NULL) {
2166                 scmd_printk(KERN_INFO, cmd, "Command not found\n");
2167                 goto no_cmd;
2168         }
2169
2170         if ((pending_scb->flags & SCB_RECOVERY_SCB) != 0) {
2171                 /*
2172                  * We can't queue two recovery actions using the same SCB
2173                  */
2174                 retval = FAILED;
2175                 goto  done;
2176         }
2177
2178         /*
2179          * Ensure that the card doesn't do anything
2180          * behind our back and that we didn't "just" miss
2181          * an interrupt that would affect this cmd.
2182          */
2183         was_paused = ahc_is_paused(ahc);
2184         ahc_pause_and_flushwork(ahc);
2185         paused = TRUE;
2186
2187         if ((pending_scb->flags & SCB_ACTIVE) == 0) {
2188                 scmd_printk(KERN_INFO, cmd, "Command already completed\n");
2189                 goto no_cmd;
2190         }
2191
2192         printf("%s: At time of recovery, card was %spaused\n",
2193                ahc_name(ahc), was_paused ? "" : "not ");
2194         ahc_dump_card_state(ahc);
2195
2196         disconnected = TRUE;
2197         if (flag == SCB_ABORT) {
2198                 if (ahc_search_qinfifo(ahc, cmd->device->id,
2199                                        cmd->device->channel + 'A',
2200                                        cmd->device->lun,
2201                                        pending_scb->hscb->tag,
2202                                        ROLE_INITIATOR, CAM_REQ_ABORTED,
2203                                        SEARCH_COMPLETE) > 0) {
2204                         printf("%s:%d:%d:%d: Cmd aborted from QINFIFO\n",
2205                                ahc_name(ahc), cmd->device->channel,
2206                                         cmd->device->id, cmd->device->lun);
2207                         retval = SUCCESS;
2208                         goto done;
2209                 }
2210         } else if (ahc_search_qinfifo(ahc, cmd->device->id,
2211                                       cmd->device->channel + 'A',
2212                                       cmd->device->lun, pending_scb->hscb->tag,
2213                                       ROLE_INITIATOR, /*status*/0,
2214                                       SEARCH_COUNT) > 0) {
2215                 disconnected = FALSE;
2216         }
2217
2218         if (disconnected && (ahc_inb(ahc, SEQ_FLAGS) & NOT_IDENTIFIED) == 0) {
2219                 struct scb *bus_scb;
2220
2221                 bus_scb = ahc_lookup_scb(ahc, ahc_inb(ahc, SCB_TAG));
2222                 if (bus_scb == pending_scb)
2223                         disconnected = FALSE;
2224                 else if (flag != SCB_ABORT
2225                       && ahc_inb(ahc, SAVED_SCSIID) == pending_scb->hscb->scsiid
2226                       && ahc_inb(ahc, SAVED_LUN) == SCB_GET_LUN(pending_scb))
2227                         disconnected = FALSE;
2228         }
2229
2230         /*
2231          * At this point, pending_scb is the scb associated with the
2232          * passed in command.  That command is currently active on the
2233          * bus, is in the disconnected state, or we're hoping to find
2234          * a command for the same target active on the bus to abuse to
2235          * send a BDR.  Queue the appropriate message based on which of
2236          * these states we are in.
2237          */
2238         last_phase = ahc_inb(ahc, LASTPHASE);
2239         saved_scbptr = ahc_inb(ahc, SCBPTR);
2240         active_scb_index = ahc_inb(ahc, SCB_TAG);
2241         saved_scsiid = ahc_inb(ahc, SAVED_SCSIID);
2242         if (last_phase != P_BUSFREE
2243          && (pending_scb->hscb->tag == active_scb_index
2244           || (flag == SCB_DEVICE_RESET
2245            && SCSIID_TARGET(ahc, saved_scsiid) == scmd_id(cmd)))) {
2246
2247                 /*
2248                  * We're active on the bus, so assert ATN
2249                  * and hope that the target responds.
2250                  */
2251                 pending_scb = ahc_lookup_scb(ahc, active_scb_index);
2252                 pending_scb->flags |= SCB_RECOVERY_SCB|flag;
2253                 ahc_outb(ahc, MSG_OUT, HOST_MSG);
2254                 ahc_outb(ahc, SCSISIGO, last_phase|ATNO);
2255                 scmd_printk(KERN_INFO, cmd, "Device is active, asserting ATN\n");
2256                 wait = TRUE;
2257         } else if (disconnected) {
2258
2259                 /*
2260                  * Actually re-queue this SCB in an attempt
2261                  * to select the device before it reconnects.
2262                  * In either case (selection or reselection),
2263                  * we will now issue the approprate message
2264                  * to the timed-out device.
2265                  *
2266                  * Set the MK_MESSAGE control bit indicating
2267                  * that we desire to send a message.  We
2268                  * also set the disconnected flag since
2269                  * in the paging case there is no guarantee
2270                  * that our SCB control byte matches the
2271                  * version on the card.  We don't want the
2272                  * sequencer to abort the command thinking
2273                  * an unsolicited reselection occurred.
2274                  */
2275                 pending_scb->hscb->control |= MK_MESSAGE|DISCONNECTED;
2276                 pending_scb->flags |= SCB_RECOVERY_SCB|flag;
2277
2278                 /*
2279                  * Remove any cached copy of this SCB in the
2280                  * disconnected list in preparation for the
2281                  * queuing of our abort SCB.  We use the
2282                  * same element in the SCB, SCB_NEXT, for
2283                  * both the qinfifo and the disconnected list.
2284                  */
2285                 ahc_search_disc_list(ahc, cmd->device->id,
2286                                      cmd->device->channel + 'A',
2287                                      cmd->device->lun, pending_scb->hscb->tag,
2288                                      /*stop_on_first*/TRUE,
2289                                      /*remove*/TRUE,
2290                                      /*save_state*/FALSE);
2291
2292                 /*
2293                  * In the non-paging case, the sequencer will
2294                  * never re-reference the in-core SCB.
2295                  * To make sure we are notified during
2296                  * reslection, set the MK_MESSAGE flag in
2297                  * the card's copy of the SCB.
2298                  */
2299                 if ((ahc->flags & AHC_PAGESCBS) == 0) {
2300                         ahc_outb(ahc, SCBPTR, pending_scb->hscb->tag);
2301                         ahc_outb(ahc, SCB_CONTROL,
2302                                  ahc_inb(ahc, SCB_CONTROL)|MK_MESSAGE);
2303                 }
2304
2305                 /*
2306                  * Clear out any entries in the QINFIFO first
2307                  * so we are the next SCB for this target
2308                  * to run.
2309                  */
2310                 ahc_search_qinfifo(ahc, cmd->device->id,
2311                                    cmd->device->channel + 'A',
2312                                    cmd->device->lun, SCB_LIST_NULL,
2313                                    ROLE_INITIATOR, CAM_REQUEUE_REQ,
2314                                    SEARCH_COMPLETE);
2315                 ahc_qinfifo_requeue_tail(ahc, pending_scb);
2316                 ahc_outb(ahc, SCBPTR, saved_scbptr);
2317                 ahc_print_path(ahc, pending_scb);
2318                 printf("Device is disconnected, re-queuing SCB\n");
2319                 wait = TRUE;
2320         } else {
2321                 scmd_printk(KERN_INFO, cmd, "Unable to deliver message\n");
2322                 retval = FAILED;
2323                 goto done;
2324         }
2325
2326 no_cmd:
2327         /*
2328          * Our assumption is that if we don't have the command, no
2329          * recovery action was required, so we return success.  Again,
2330          * the semantics of the mid-layer recovery engine are not
2331          * well defined, so this may change in time.
2332          */
2333         retval = SUCCESS;
2334 done:
2335         if (paused)
2336                 ahc_unpause(ahc);
2337         if (wait) {
2338                 DECLARE_COMPLETION(done);
2339
2340                 ahc->platform_data->eh_done = &done;
2341                 ahc_unlock(ahc, &flags);
2342
2343                 printf("Recovery code sleeping\n");
2344                 if (!wait_for_completion_timeout(&done, 5 * HZ)) {
2345                         ahc_lock(ahc, &flags);
2346                         ahc->platform_data->eh_done = NULL;
2347                         ahc_unlock(ahc, &flags);
2348
2349                         printf("Timer Expired\n");
2350                         retval = FAILED;
2351                 }
2352                 printf("Recovery code awake\n");
2353         } else
2354                 ahc_unlock(ahc, &flags);
2355         return (retval);
2356 }
2357
2358 void
2359 ahc_platform_dump_card_state(struct ahc_softc *ahc)
2360 {
2361 }
2362
2363 static void ahc_linux_set_width(struct scsi_target *starget, int width)
2364 {
2365         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2366         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2367         struct ahc_devinfo devinfo;
2368         unsigned long flags;
2369
2370         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2371                             starget->channel + 'A', ROLE_INITIATOR);
2372         ahc_lock(ahc, &flags);
2373         ahc_set_width(ahc, &devinfo, width, AHC_TRANS_GOAL, FALSE);
2374         ahc_unlock(ahc, &flags);
2375 }
2376
2377 static void ahc_linux_set_period(struct scsi_target *starget, int period)
2378 {
2379         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2380         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2381         struct ahc_tmode_tstate *tstate;
2382         struct ahc_initiator_tinfo *tinfo
2383                 = ahc_fetch_transinfo(ahc,
2384                                       starget->channel + 'A',
2385                                       shost->this_id, starget->id, &tstate);
2386         struct ahc_devinfo devinfo;
2387         unsigned int ppr_options = tinfo->goal.ppr_options;
2388         unsigned long flags;
2389         unsigned long offset = tinfo->goal.offset;
2390         struct ahc_syncrate *syncrate;
2391
2392         if (offset == 0)
2393                 offset = MAX_OFFSET;
2394
2395         if (period < 9)
2396                 period = 9;     /* 12.5ns is our minimum */
2397         if (period == 9)
2398                 ppr_options |= MSG_EXT_PPR_DT_REQ;
2399
2400         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2401                             starget->channel + 'A', ROLE_INITIATOR);
2402
2403         /* all PPR requests apart from QAS require wide transfers */
2404         if (ppr_options & ~MSG_EXT_PPR_QAS_REQ) {
2405                 if (spi_width(starget) == 0)
2406                         ppr_options &= MSG_EXT_PPR_QAS_REQ;
2407         }
2408
2409         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2410         ahc_lock(ahc, &flags);
2411         ahc_set_syncrate(ahc, &devinfo, syncrate, period, offset,
2412                          ppr_options, AHC_TRANS_GOAL, FALSE);
2413         ahc_unlock(ahc, &flags);
2414 }
2415
2416 static void ahc_linux_set_offset(struct scsi_target *starget, int offset)
2417 {
2418         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2419         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2420         struct ahc_tmode_tstate *tstate;
2421         struct ahc_initiator_tinfo *tinfo
2422                 = ahc_fetch_transinfo(ahc,
2423                                       starget->channel + 'A',
2424                                       shost->this_id, starget->id, &tstate);
2425         struct ahc_devinfo devinfo;
2426         unsigned int ppr_options = 0;
2427         unsigned int period = 0;
2428         unsigned long flags;
2429         struct ahc_syncrate *syncrate = NULL;
2430
2431         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2432                             starget->channel + 'A', ROLE_INITIATOR);
2433         if (offset != 0) {
2434                 syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2435                 period = tinfo->goal.period;
2436                 ppr_options = tinfo->goal.ppr_options;
2437         }
2438         ahc_lock(ahc, &flags);
2439         ahc_set_syncrate(ahc, &devinfo, syncrate, period, offset,
2440                          ppr_options, AHC_TRANS_GOAL, FALSE);
2441         ahc_unlock(ahc, &flags);
2442 }
2443
2444 static void ahc_linux_set_dt(struct scsi_target *starget, int dt)
2445 {
2446         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2447         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2448         struct ahc_tmode_tstate *tstate;
2449         struct ahc_initiator_tinfo *tinfo
2450                 = ahc_fetch_transinfo(ahc,
2451                                       starget->channel + 'A',
2452                                       shost->this_id, starget->id, &tstate);
2453         struct ahc_devinfo devinfo;
2454         unsigned int ppr_options = tinfo->goal.ppr_options
2455                 & ~MSG_EXT_PPR_DT_REQ;
2456         unsigned int period = tinfo->goal.period;
2457         unsigned int width = tinfo->goal.width;
2458         unsigned long flags;
2459         struct ahc_syncrate *syncrate;
2460
2461         if (dt) {
2462                 ppr_options |= MSG_EXT_PPR_DT_REQ;
2463                 if (!width)
2464                         ahc_linux_set_width(starget, 1);
2465         } else if (period == 9)
2466                 period = 10;    /* if resetting DT, period must be >= 25ns */
2467
2468         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2469                             starget->channel + 'A', ROLE_INITIATOR);
2470         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options,AHC_SYNCRATE_DT);
2471         ahc_lock(ahc, &flags);
2472         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2473                          ppr_options, AHC_TRANS_GOAL, FALSE);
2474         ahc_unlock(ahc, &flags);
2475 }
2476
2477 #if 0
2478 /* FIXME: This code claims to support IU and QAS.  However, the actual
2479  * sequencer code and aic7xxx_core have no support for these parameters and
2480  * will get into a bad state if they're negotiated.  Do not enable this
2481  * unless you know what you're doing */
2482 static void ahc_linux_set_qas(struct scsi_target *starget, int qas)
2483 {
2484         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2485         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2486         struct ahc_tmode_tstate *tstate;
2487         struct ahc_initiator_tinfo *tinfo
2488                 = ahc_fetch_transinfo(ahc,
2489                                       starget->channel + 'A',
2490                                       shost->this_id, starget->id, &tstate);
2491         struct ahc_devinfo devinfo;
2492         unsigned int ppr_options = tinfo->goal.ppr_options
2493                 & ~MSG_EXT_PPR_QAS_REQ;
2494         unsigned int period = tinfo->goal.period;
2495         unsigned long flags;
2496         struct ahc_syncrate *syncrate;
2497
2498         if (qas)
2499                 ppr_options |= MSG_EXT_PPR_QAS_REQ;
2500
2501         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2502                             starget->channel + 'A', ROLE_INITIATOR);
2503         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2504         ahc_lock(ahc, &flags);
2505         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2506                          ppr_options, AHC_TRANS_GOAL, FALSE);
2507         ahc_unlock(ahc, &flags);
2508 }
2509
2510 static void ahc_linux_set_iu(struct scsi_target *starget, int iu)
2511 {
2512         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2513         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2514         struct ahc_tmode_tstate *tstate;
2515         struct ahc_initiator_tinfo *tinfo
2516                 = ahc_fetch_transinfo(ahc,
2517                                       starget->channel + 'A',
2518                                       shost->this_id, starget->id, &tstate);
2519         struct ahc_devinfo devinfo;
2520         unsigned int ppr_options = tinfo->goal.ppr_options
2521                 & ~MSG_EXT_PPR_IU_REQ;
2522         unsigned int period = tinfo->goal.period;
2523         unsigned long flags;
2524         struct ahc_syncrate *syncrate;
2525
2526         if (iu)
2527                 ppr_options |= MSG_EXT_PPR_IU_REQ;
2528
2529         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2530                             starget->channel + 'A', ROLE_INITIATOR);
2531         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2532         ahc_lock(ahc, &flags);
2533         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2534                          ppr_options, AHC_TRANS_GOAL, FALSE);
2535         ahc_unlock(ahc, &flags);
2536 }
2537 #endif
2538
2539 static void ahc_linux_get_signalling(struct Scsi_Host *shost)
2540 {
2541         struct ahc_softc *ahc = *(struct ahc_softc **)shost->hostdata;
2542         unsigned long flags;
2543         u8 mode;
2544
2545         if (!(ahc->features & AHC_ULTRA2)) {
2546                 /* non-LVD chipset, may not have SBLKCTL reg */
2547                 spi_signalling(shost) =
2548                         ahc->features & AHC_HVD ?
2549                         SPI_SIGNAL_HVD :
2550                         SPI_SIGNAL_SE;
2551                 return;
2552         }
2553
2554         ahc_lock(ahc, &flags);
2555         ahc_pause(ahc);
2556         mode = ahc_inb(ahc, SBLKCTL);
2557         ahc_unpause(ahc);
2558         ahc_unlock(ahc, &flags);
2559
2560         if (mode & ENAB40)
2561                 spi_signalling(shost) = SPI_SIGNAL_LVD;
2562         else if (mode & ENAB20)
2563                 spi_signalling(shost) = SPI_SIGNAL_SE;
2564         else
2565                 spi_signalling(shost) = SPI_SIGNAL_UNKNOWN;
2566 }
2567
2568 static struct spi_function_template ahc_linux_transport_functions = {
2569         .set_offset     = ahc_linux_set_offset,
2570         .show_offset    = 1,
2571         .set_period     = ahc_linux_set_period,
2572         .show_period    = 1,
2573         .set_width      = ahc_linux_set_width,
2574         .show_width     = 1,
2575         .set_dt         = ahc_linux_set_dt,
2576         .show_dt        = 1,
2577 #if 0
2578         .set_iu         = ahc_linux_set_iu,
2579         .show_iu        = 1,
2580         .set_qas        = ahc_linux_set_qas,
2581         .show_qas       = 1,
2582 #endif
2583         .get_signalling = ahc_linux_get_signalling,
2584 };
2585
2586
2587
2588 static int __init
2589 ahc_linux_init(void)
2590 {
2591         /*
2592          * If we've been passed any parameters, process them now.
2593          */
2594         if (aic7xxx)
2595                 aic7xxx_setup(aic7xxx);
2596
2597         ahc_linux_transport_template =
2598                 spi_attach_transport(&ahc_linux_transport_functions);
2599         if (!ahc_linux_transport_template)
2600                 return -ENODEV;
2601
2602         scsi_transport_reserve_target(ahc_linux_transport_template,
2603                                       sizeof(struct ahc_linux_target));
2604         scsi_transport_reserve_device(ahc_linux_transport_template,
2605                                       sizeof(struct ahc_linux_device));
2606
2607         ahc_linux_pci_init();
2608         ahc_linux_eisa_init();
2609         return 0;
2610 }
2611
2612 static void
2613 ahc_linux_exit(void)
2614 {
2615         ahc_linux_pci_exit();
2616         ahc_linux_eisa_exit();
2617         spi_release_transport(ahc_linux_transport_template);
2618 }
2619
2620 module_init(ahc_linux_init);
2621 module_exit(ahc_linux_exit);