drivers/scsi/aic7xxx/aic7xxx_osm.c

   1 /*
   2  * Adaptec AIC7xxx device driver for Linux.
   3  *
   4  * $Id: //depot/aic7xxx/linux/drivers/scsi/aic7xxx/aic7xxx_osm.c#235 $
   5  *
   6  * Copyright (c) 1994 John Aycock
   7  *   The University of Calgary Department of Computer Science.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2, or (at your option)
  12  * any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; see the file COPYING.  If not, write to
  21  * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  22  *
  23  * Sources include the Adaptec 1740 driver (aha1740.c), the Ultrastor 24F
  24  * driver (ultrastor.c), various Linux kernel source, the Adaptec EISA
  25  * config file (!adp7771.cfg), the Adaptec AHA-2740A Series User's Guide,
  26  * the Linux Kernel Hacker's Guide, Writing a SCSI Device Driver for Linux,
  27  * the Adaptec 1542 driver (aha1542.c), the Adaptec EISA overlay file
  28  * (adp7770.ovl), the Adaptec AHA-2740 Series Technical Reference Manual,
  29  * the Adaptec AIC-7770 Data Book, the ANSI SCSI specification, the
  30  * ANSI SCSI-2 specification (draft 10c), ...
  31  *
  32  * --------------------------------------------------------------------------
  33  *
  34  *  Modifications by Daniel M. Eischen (deischen@iworks.InterWorks.org):
  35  *
  36  *  Substantially modified to include support for wide and twin bus
  37  *  adapters, DMAing of SCBs, tagged queueing, IRQ sharing, bug fixes,
  38  *  SCB paging, and other rework of the code.
  39  *
  40  * --------------------------------------------------------------------------
  41  * Copyright (c) 1994-2000 Justin T. Gibbs.
  42  * Copyright (c) 2000-2001 Adaptec Inc.
  43  * All rights reserved.
  44  *
  45  * Redistribution and use in source and binary forms, with or without
  46  * modification, are permitted provided that the following conditions
  47  * are met:
  48  * 1. Redistributions of source code must retain the above copyright
  49  *    notice, this list of conditions, and the following disclaimer,
  50  *    without modification.
  51  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  52  *    substantially similar to the "NO WARRANTY" disclaimer below
  53  *    ("Disclaimer") and any redistribution must be conditioned upon
  54  *    including a substantially similar Disclaimer requirement for further
  55  *    binary redistribution.
  56  * 3. Neither the names of the above-listed copyright holders nor the names
  57  *    of any contributors may be used to endorse or promote products derived
  58  *    from this software without specific prior written permission.
  59  *
  60  * Alternatively, this software may be distributed under the terms of the
  61  * GNU General Public License ("GPL") version 2 as published by the Free
  62  * Software Foundation.
  63  *
  64  * NO WARRANTY
  65  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  66  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  67  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  68  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  69  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  70  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  71  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  72  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  73  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  74  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  75  * POSSIBILITY OF SUCH DAMAGES.
  76  *
  77  *---------------------------------------------------------------------------
  78  *
  79  *  Thanks also go to (in alphabetical order) the following:
  80  *
  81  *    Rory Bolt     - Sequencer bug fixes
  82  *    Jay Estabrook - Initial DEC Alpha support
  83  *    Doug Ledford  - Much needed abort/reset bug fixes
  84  *    Kai Makisara  - DMAing of SCBs
  85  *
  86  *  A Boot time option was also added for not resetting the scsi bus.
  87  *
  88  *    Form:  aic7xxx=extended
  89  *           aic7xxx=no_reset
  90  *           aic7xxx=verbose
  91  *
  92  *  Daniel M. Eischen, deischen@iworks.InterWorks.org, 1/23/97
  93  *
  94  *  Id: aic7xxx.c,v 4.1 1997/06/12 08:23:42 deang Exp
  95  */
  96
  97 /*
  98  * Further driver modifications made by Doug Ledford <dledford@redhat.com>
  99  *
 100  * Copyright (c) 1997-1999 Doug Ledford
 101  *
 102  * These changes are released under the same licensing terms as the FreeBSD
 103  * driver written by Justin Gibbs.  Please see his Copyright notice above
 104  * for the exact terms and conditions covering my changes as well as the
 105  * warranty statement.
 106  *
 107  * Modifications made to the aic7xxx.c,v 4.1 driver from Dan Eischen include
 108  * but are not limited to:
 109  *
 110  *  1: Import of the latest FreeBSD sequencer code for this driver
 111  *  2: Modification of kernel code to accommodate different sequencer semantics
 112  *  3: Extensive changes throughout kernel portion of driver to improve
 113  *     abort/reset processing and error hanndling
 114  *  4: Other work contributed by various people on the Internet
 115  *  5: Changes to printk information and verbosity selection code
 116  *  6: General reliability related changes, especially in IRQ management
 117  *  7: Modifications to the default probe/attach order for supported cards
 118  *  8: SMP friendliness has been improved
 119  *
 120  */
 121
 122 #include "aic7xxx_osm.h"
 123 #include "aic7xxx_inline.h"
 124 #include <scsi/scsicam.h>
 125
 126 static struct scsi_transport_template *ahc_linux_transport_template = NULL;
 127
 128 #include <linux/init.h>         /* __setup */
 129 #include <linux/mm.h>           /* For fetching system memory size */
 130 #include <linux/blkdev.h>               /* For block_size() */
 131 #include <linux/delay.h>        /* For ssleep/msleep */
 132
 133
 134 /*
 135  * Set this to the delay in seconds after SCSI bus reset.
 136  * Note, we honor this only for the initial bus reset.
 137  * The scsi error recovery code performs its own bus settle
 138  * delay handling for error recovery actions.
 139  */
 140 #ifdef CONFIG_AIC7XXX_RESET_DELAY_MS
 141 #define AIC7XXX_RESET_DELAY CONFIG_AIC7XXX_RESET_DELAY_MS
 142 #else
 143 #define AIC7XXX_RESET_DELAY 5000
 144 #endif
 145
 146 /*
 147  * Control collection of SCSI transfer statistics for the /proc filesystem.
 148  *
 149  * NOTE: Do NOT enable this when running on kernels version 1.2.x and below.
 150  * NOTE: This does affect performance since it has to maintain statistics.
 151  */
 152 #ifdef CONFIG_AIC7XXX_PROC_STATS
 153 #define AIC7XXX_PROC_STATS
 154 #endif
 155
 156 /*
 157  * To change the default number of tagged transactions allowed per-device,
 158  * add a line to the lilo.conf file like:
 159  * append="aic7xxx=verbose,tag_info:{{32,32,32,32},{32,32,32,32}}"
 160  * which will result in the first four devices on the first two
 161  * controllers being set to a tagged queue depth of 32.
 162  *
 163  * The tag_commands is an array of 16 to allow for wide and twin adapters.
 164  * Twin adapters will use indexes 0-7 for channel 0, and indexes 8-15
 165  * for channel 1.
 166  */
 167 typedef struct {
 168         uint8_t tag_commands[16];       /* Allow for wide/twin adapters. */
 169 } adapter_tag_info_t;
 170
 171 /*
 172  * Modify this as you see fit for your system.
 173  *
 174  * 0                    tagged queuing disabled
 175  * 1 <= n <= 253        n == max tags ever dispatched.
 176  *
 177  * The driver will throttle the number of commands dispatched to a
 178  * device if it returns queue full.  For devices with a fixed maximum
 179  * queue depth, the driver will eventually determine this depth and
 180  * lock it in (a console message is printed to indicate that a lock
 181  * has occurred).  On some devices, queue full is returned for a temporary
 182  * resource shortage.  These devices will return queue full at varying
 183  * depths.  The driver will throttle back when the queue fulls occur and
 184  * attempt to slowly increase the depth over time as the device recovers
 185  * from the resource shortage.
 186  *
 187  * In this example, the first line will disable tagged queueing for all
 188  * the devices on the first probed aic7xxx adapter.
 189  *
 190  * The second line enables tagged queueing with 4 commands/LUN for IDs
 191  * (0, 2-11, 13-15), disables tagged queueing for ID 12, and tells the
 192  * driver to attempt to use up to 64 tags for ID 1.
 193  *
 194  * The third line is the same as the first line.
 195  *
 196  * The fourth line disables tagged queueing for devices 0 and 3.  It
 197  * enables tagged queueing for the other IDs, with 16 commands/LUN
 198  * for IDs 1 and 4, 127 commands/LUN for ID 8, and 4 commands/LUN for
 199  * IDs 2, 5-7, and 9-15.
 200  */
 201
 202 /*
 203  * NOTE: The below structure is for reference only, the actual structure
 204  *       to modify in order to change things is just below this comment block.
 205 adapter_tag_info_t aic7xxx_tag_info[] =
 206 {
 207         {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
 208         {{4, 64, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 0, 4, 4, 4}},
 209         {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
 210         {{0, 16, 4, 0, 16, 4, 4, 4, 127, 4, 4, 4, 4, 4, 4, 4}}
 211 };
 212 */
 213
 214 #ifdef CONFIG_AIC7XXX_CMDS_PER_DEVICE
 215 #define AIC7XXX_CMDS_PER_DEVICE CONFIG_AIC7XXX_CMDS_PER_DEVICE
 216 #else
 217 #define AIC7XXX_CMDS_PER_DEVICE AHC_MAX_QUEUE
 218 #endif
 219
 220 #define AIC7XXX_CONFIGED_TAG_COMMANDS {                                 \
 221         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 222         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 223         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 224         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 225         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 226         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 227         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 228         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE                \
 229 }
 230
 231 /*
 232  * By default, use the number of commands specified by
 233  * the users kernel configuration.
 234  */
 235 static adapter_tag_info_t aic7xxx_tag_info[] =
 236 {
 237         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 238         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 239         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 240         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 241         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 242         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 243         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 244         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 245         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 246         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 247         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 248         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 249         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 250         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 251         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 252         {AIC7XXX_CONFIGED_TAG_COMMANDS}
 253 };
 254
 255 /*
 256  * There should be a specific return value for this in scsi.h, but
 257  * it seems that most drivers ignore it.
 258  */
 259 #define DID_UNDERFLOW   DID_ERROR
 260
 261 void
 262 ahc_print_path(struct ahc_softc *ahc, struct scb *scb)
 263 {
 264         printk("(scsi%d:%c:%d:%d): ",
 265                ahc->platform_data->host->host_no,
 266                scb != NULL ? SCB_GET_CHANNEL(ahc, scb) : 'X',
 267                scb != NULL ? SCB_GET_TARGET(ahc, scb) : -1,
 268                scb != NULL ? SCB_GET_LUN(scb) : -1);
 269 }
 270
 271 /*
 272  * XXX - these options apply unilaterally to _all_ 274x/284x/294x
 273  *       cards in the system.  This should be fixed.  Exceptions to this
 274  *       rule are noted in the comments.
 275  */
 276
 277 /*
 278  * Skip the scsi bus reset.  Non 0 make us skip the reset at startup.  This
 279  * has no effect on any later resets that might occur due to things like
 280  * SCSI bus timeouts.
 281  */
 282 static uint32_t aic7xxx_no_reset;
 283
 284 /*
 285  * Should we force EXTENDED translation on a controller.
 286  *     0 == Use whatever is in the SEEPROM or default to off
 287  *     1 == Use whatever is in the SEEPROM or default to on
 288  */
 289 static uint32_t aic7xxx_extended;
 290
 291 /*
 292  * PCI bus parity checking of the Adaptec controllers.  This is somewhat
 293  * dubious at best.  To my knowledge, this option has never actually
 294  * solved a PCI parity problem, but on certain machines with broken PCI
 295  * chipset configurations where stray PCI transactions with bad parity are
 296  * the norm rather than the exception, the error messages can be overwelming.
 297  * It's included in the driver for completeness.
 298  *   0     = Shut off PCI parity check
 299  *   non-0 = reverse polarity pci parity checking
 300  */
 301 static uint32_t aic7xxx_pci_parity = ~0;
 302
 303 /*
 304  * There are lots of broken chipsets in the world.  Some of them will
 305  * violate the PCI spec when we issue byte sized memory writes to our
 306  * controller.  I/O mapped register access, if allowed by the given
 307  * platform, will work in almost all cases.
 308  */
 309 uint32_t aic7xxx_allow_memio = ~0;
 310
 311 /*
 312  * So that we can set how long each device is given as a selection timeout.
 313  * The table of values goes like this:
 314  *   0 - 256ms
 315  *   1 - 128ms
 316  *   2 - 64ms
 317  *   3 - 32ms
 318  * We default to 256ms because some older devices need a longer time
 319  * to respond to initial selection.
 320  */
 321 static uint32_t aic7xxx_seltime;
 322
 323 /*
 324  * Certain devices do not perform any aging on commands.  Should the
 325  * device be saturated by commands in one portion of the disk, it is
 326  * possible for transactions on far away sectors to never be serviced.
 327  * To handle these devices, we can periodically send an ordered tag to
 328  * force all outstanding transactions to be serviced prior to a new
 329  * transaction.
 330  */
 331 uint32_t aic7xxx_periodic_otag;
 332
 333 /*
 334  * Module information and settable options.
 335  */
 336 static char *aic7xxx = NULL;
 337
 338 MODULE_AUTHOR("Maintainer: Justin T. Gibbs <gibbs@scsiguy.com>");
 339 MODULE_DESCRIPTION("Adaptec Aic77XX/78XX SCSI Host Bus Adapter driver");
 340 MODULE_LICENSE("Dual BSD/GPL");
 341 MODULE_VERSION(AIC7XXX_DRIVER_VERSION);
 342 module_param(aic7xxx, charp, 0444);
 343 MODULE_PARM_DESC(aic7xxx,
 344 "period delimited, options string.\n"
 345 "       verbose                 Enable verbose/diagnostic logging\n"
 346 "       allow_memio             Allow device registers to be memory mapped\n"
 347 "       debug                   Bitmask of debug values to enable\n"
 348 "       no_probe                Toggle EISA/VLB controller probing\n"
 349 "       probe_eisa_vl           Toggle EISA/VLB controller probing\n"
 350 "       no_reset                Supress initial bus resets\n"
 351 "       extended                Enable extended geometry on all controllers\n"
 352 "       periodic_otag           Send an ordered tagged transaction\n"
 353 "                               periodically to prevent tag starvation.\n"
 354 "                               This may be required by some older disk\n"
 355 "                               drives or RAID arrays.\n"
 356 "       reverse_scan            Sort PCI devices highest Bus/Slot to lowest\n"
 357 "       tag_info:<tag_str>      Set per-target tag depth\n"
 358 "       global_tag_depth:<int>  Global tag depth for every target\n"
 359 "                               on every bus\n"
 360 "       seltime:<int>           Selection Timeout\n"
 361 "                               (0/256ms,1/128ms,2/64ms,3/32ms)\n"
 362 "\n"
 363 "       Sample /etc/modprobe.conf line:\n"
 364 "               Toggle EISA/VLB probing\n"
 365 "               Set tag depth on Controller 1/Target 1 to 10 tags\n"
 366 "               Shorten the selection timeout to 128ms\n"
 367 "\n"
 368 "       options aic7xxx 'aic7xxx=probe_eisa_vl.tag_info:{{}.{.10}}.seltime:1'\n"
 369 );
 370
 371 static void ahc_linux_handle_scsi_status(struct ahc_softc *,
 372                                          struct scsi_device *,
 373                                          struct scb *);
 374 static void ahc_linux_queue_cmd_complete(struct ahc_softc *ahc,
 375                                          struct scsi_cmnd *cmd);
 376 static void ahc_linux_freeze_simq(struct ahc_softc *ahc);
 377 static void ahc_linux_release_simq(struct ahc_softc *ahc);
 378 static int  ahc_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag);
 379 static void ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc);
 380 static u_int ahc_linux_user_tagdepth(struct ahc_softc *ahc,
 381                                      struct ahc_devinfo *devinfo);
 382 static void ahc_linux_device_queue_depth(struct scsi_device *);
 383 static int ahc_linux_run_command(struct ahc_softc*,
 384                                  struct ahc_linux_device *,
 385                                  struct scsi_cmnd *);
 386 static void ahc_linux_setup_tag_info_global(char *p);
 387 static int  aic7xxx_setup(char *s);
 388
 389 static int ahc_linux_unit;
 390
 391
 392 /********************************* Inlines ************************************/
 393 static __inline void ahc_linux_unmap_scb(struct ahc_softc*, struct scb*);
 394
 395 static __inline int ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb,
 396                                       struct ahc_dma_seg *sg,
 397                                       dma_addr_t addr, bus_size_t len);
 398
 399 static __inline void
 400 ahc_linux_unmap_scb(struct ahc_softc *ahc, struct scb *scb)
 401 {
 402         struct scsi_cmnd *cmd;
 403
 404         cmd = scb->io_ctx;
 405         ahc_sync_sglist(ahc, scb, BUS_DMASYNC_POSTWRITE);
 406         if (cmd->use_sg != 0) {
 407                 struct scatterlist *sg;
 408
 409                 sg = (struct scatterlist *)cmd->request_buffer;
 410                 pci_unmap_sg(ahc->dev_softc, sg, cmd->use_sg,
 411                              cmd->sc_data_direction);
 412         } else if (cmd->request_bufflen != 0) {
 413                 pci_unmap_single(ahc->dev_softc,
 414                                  scb->platform_data->buf_busaddr,
 415                                  cmd->request_bufflen,
 416                                  cmd->sc_data_direction);
 417         }
 418 }
 419
 420 static __inline int
 421 ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb,
 422                   struct ahc_dma_seg *sg, dma_addr_t addr, bus_size_t len)
 423 {
 424         int      consumed;
 425
 426         if ((scb->sg_count + 1) > AHC_NSEG)
 427                 panic("Too few segs for dma mapping.  "
 428                       "Increase AHC_NSEG\n");
 429
 430         consumed = 1;
 431         sg->addr = ahc_htole32(addr & 0xFFFFFFFF);
 432         scb->platform_data->xfer_len += len;
 433
 434         if (sizeof(dma_addr_t) > 4
 435          && (ahc->flags & AHC_39BIT_ADDRESSING) != 0)
 436                 len |= (addr >> 8) & AHC_SG_HIGH_ADDR_MASK;
 437
 438         sg->len = ahc_htole32(len);
 439         return (consumed);
 440 }
 441
 442 /*
 443  * Return a string describing the driver.
 444  */
 445 static const char *
 446 ahc_linux_info(struct Scsi_Host *host)
 447 {
 448         static char buffer[512];
 449         char    ahc_info[256];
 450         char   *bp;
 451         struct ahc_softc *ahc;
 452
 453         bp = &buffer[0];
 454         ahc = *(struct ahc_softc **)host->hostdata;
 455         memset(bp, 0, sizeof(buffer));
 456         strcpy(bp, "Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev ");
 457         strcat(bp, AIC7XXX_DRIVER_VERSION);
 458         strcat(bp, "\n");
 459         strcat(bp, "        <");
 460         strcat(bp, ahc->description);
 461         strcat(bp, ">\n");
 462         strcat(bp, "        ");
 463         ahc_controller_info(ahc, ahc_info);
 464         strcat(bp, ahc_info);
 465         strcat(bp, "\n");
 466
 467         return (bp);
 468 }
 469
 470 /*
 471  * Queue an SCB to the controller.
 472  */
 473 static int
 474 ahc_linux_queue(struct scsi_cmnd * cmd, void (*scsi_done) (struct scsi_cmnd *))
 475 {
 476         struct   ahc_softc *ahc;
 477         struct   ahc_linux_device *dev = scsi_transport_device_data(cmd->device);
 478         int rtn = SCSI_MLQUEUE_HOST_BUSY;
 479         unsigned long flags;
 480
 481         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
 482
 483         ahc_lock(ahc, &flags);
 484         if (ahc->platform_data->qfrozen == 0) {
 485                 cmd->scsi_done = scsi_done;
 486                 cmd->result = CAM_REQ_INPROG << 16;
 487                 rtn = ahc_linux_run_command(ahc, dev, cmd);
 488         }
 489         ahc_unlock(ahc, &flags);
 490
 491         return rtn;
 492 }
 493
 494 static inline struct scsi_target **
 495 ahc_linux_target_in_softc(struct scsi_target *starget)
 496 {
 497         struct  ahc_softc *ahc =
 498                 *((struct ahc_softc **)dev_to_shost(&starget->dev)->hostdata);
 499         unsigned int target_offset;
 500
 501         target_offset = starget->id;
 502         if (starget->channel != 0)
 503                 target_offset += 8;
 504
 505         return &ahc->platform_data->starget[target_offset];
 506 }
 507
 508 static int
 509 ahc_linux_target_alloc(struct scsi_target *starget)
 510 {
 511         struct  ahc_softc *ahc =
 512                 *((struct ahc_softc **)dev_to_shost(&starget->dev)->hostdata);
 513         struct seeprom_config *sc = ahc->seep_config;
 514         unsigned long flags;
 515         struct scsi_target **ahc_targp = ahc_linux_target_in_softc(starget);
 516         struct ahc_linux_target *targ = scsi_transport_target_data(starget);
 517         unsigned short scsirate;
 518         struct ahc_devinfo devinfo;
 519         struct ahc_initiator_tinfo *tinfo;
 520         struct ahc_tmode_tstate *tstate;
 521         char channel = starget->channel + 'A';
 522         unsigned int our_id = ahc->our_id;
 523         unsigned int target_offset;
 524
 525         target_offset = starget->id;
 526         if (starget->channel != 0)
 527                 target_offset += 8;
 528
 529         if (starget->channel)
 530                 our_id = ahc->our_id_b;
 531
 532         ahc_lock(ahc, &flags);
 533
 534         BUG_ON(*ahc_targp != NULL);
 535
 536         *ahc_targp = starget;
 537         memset(targ, 0, sizeof(*targ));
 538
 539         if (sc) {
 540                 int maxsync = AHC_SYNCRATE_DT;
 541                 int ultra = 0;
 542                 int flags = sc->device_flags[target_offset];
 543
 544                 if (ahc->flags & AHC_NEWEEPROM_FMT) {
 545                     if (flags & CFSYNCHISULTRA)
 546                         ultra = 1;
 547                 } else if (flags & CFULTRAEN)
 548                         ultra = 1;
 549                 /* AIC nutcase; 10MHz appears as ultra = 1, CFXFER = 0x04
 550                  * change it to ultra=0, CFXFER = 0 */
 551                 if(ultra && (flags & CFXFER) == 0x04) {
 552                         ultra = 0;
 553                         flags &= ~CFXFER;
 554                 }
 555
 556                 if ((ahc->features & AHC_ULTRA2) != 0) {
 557                         scsirate = (flags & CFXFER) | (ultra ? 0x8 : 0);
 558                 } else {
 559                         scsirate = (flags & CFXFER) << 4;
 560                         maxsync = ultra ? AHC_SYNCRATE_ULTRA :
 561                                 AHC_SYNCRATE_FAST;
 562                 }
 563                 spi_max_width(starget) = (flags & CFWIDEB) ? 1 : 0;
 564                 if (!(flags & CFSYNCH))
 565                         spi_max_offset(starget) = 0;
 566                 spi_min_period(starget) =
 567                         ahc_find_period(ahc, scsirate, maxsync);
 568
 569                 tinfo = ahc_fetch_transinfo(ahc, channel, ahc->our_id,
 570                                             starget->id, &tstate);
 571         }
 572         ahc_compile_devinfo(&devinfo, our_id, starget->id,
 573                             CAM_LUN_WILDCARD, channel,
 574                             ROLE_INITIATOR);
 575         ahc_set_syncrate(ahc, &devinfo, NULL, 0, 0, 0,
 576                          AHC_TRANS_GOAL, /*paused*/FALSE);
 577         ahc_set_width(ahc, &devinfo, MSG_EXT_WDTR_BUS_8_BIT,
 578                       AHC_TRANS_GOAL, /*paused*/FALSE);
 579         ahc_unlock(ahc, &flags);
 580
 581         return 0;
 582 }
 583
 584 static void
 585 ahc_linux_target_destroy(struct scsi_target *starget)
 586 {
 587         struct scsi_target **ahc_targp = ahc_linux_target_in_softc(starget);
 588
 589         *ahc_targp = NULL;
 590 }
 591
 592 static int
 593 ahc_linux_slave_alloc(struct scsi_device *sdev)
 594 {
 595         struct  ahc_softc *ahc =
 596                 *((struct ahc_softc **)sdev->host->hostdata);
 597         struct scsi_target *starget = sdev->sdev_target;
 598         struct ahc_linux_target *targ = scsi_transport_target_data(starget);
 599         struct ahc_linux_device *dev;
 600
 601         if (bootverbose)
 602                 printf("%s: Slave Alloc %d\n", ahc_name(ahc), sdev->id);
 603
 604         BUG_ON(targ->sdev[sdev->lun] != NULL);
 605
 606         dev = scsi_transport_device_data(sdev);
 607         memset(dev, 0, sizeof(*dev));
 608
 609         /*
 610          * We start out life using untagged
 611          * transactions of which we allow one.
 612          */
 613         dev->openings = 1;
 614
 615         /*
 616          * Set maxtags to 0.  This will be changed if we
 617          * later determine that we are dealing with
 618          * a tagged queuing capable device.
 619          */
 620         dev->maxtags = 0;
 621
 622         targ->sdev[sdev->lun] = sdev;
 623
 624         spi_period(starget) = 0;
 625
 626         return 0;
 627 }
 628
 629 static int
 630 ahc_linux_slave_configure(struct scsi_device *sdev)
 631 {
 632         struct  ahc_softc *ahc;
 633
 634         ahc = *((struct ahc_softc **)sdev->host->hostdata);
 635
 636         if (bootverbose)
 637                 sdev_printk(KERN_INFO, sdev, "Slave Configure\n");
 638
 639         ahc_linux_device_queue_depth(sdev);
 640
 641         /* Initial Domain Validation */
 642         if (!spi_initial_dv(sdev->sdev_target))
 643                 spi_dv_device(sdev);
 644
 645         return 0;
 646 }
 647
 648 static void
 649 ahc_linux_slave_destroy(struct scsi_device *sdev)
 650 {
 651         struct  ahc_softc *ahc;
 652         struct  ahc_linux_device *dev = scsi_transport_device_data(sdev);
 653         struct  ahc_linux_target *targ = scsi_transport_target_data(sdev->sdev_target);
 654
 655         ahc = *((struct ahc_softc **)sdev->host->hostdata);
 656         if (bootverbose)
 657                 printf("%s: Slave Destroy %d\n", ahc_name(ahc), sdev->id);
 658
 659         BUG_ON(dev->active);
 660
 661         targ->sdev[sdev->lun] = NULL;
 662 }
 663
 664 #if defined(__i386__)
 665 /*
 666  * Return the disk geometry for the given SCSI device.
 667  */
 668 static int
 669 ahc_linux_biosparam(struct scsi_device *sdev, struct block_device *bdev,
 670                     sector_t capacity, int geom[])
 671 {
 672         uint8_t *bh;
 673         int      heads;
 674         int      sectors;
 675         int      cylinders;
 676         int      ret;
 677         int      extended;
 678         struct   ahc_softc *ahc;
 679         u_int    channel;
 680
 681         ahc = *((struct ahc_softc **)sdev->host->hostdata);
 682         channel = sdev_channel(sdev);
 683
 684         bh = scsi_bios_ptable(bdev);
 685         if (bh) {
 686                 ret = scsi_partsize(bh, capacity,
 687                                     &geom[2], &geom[0], &geom[1]);
 688                 kfree(bh);
 689                 if (ret != -1)
 690                         return (ret);
 691         }
 692         heads = 64;
 693         sectors = 32;
 694         cylinders = aic_sector_div(capacity, heads, sectors);
 695
 696         if (aic7xxx_extended != 0)
 697                 extended = 1;
 698         else if (channel == 0)
 699                 extended = (ahc->flags & AHC_EXTENDED_TRANS_A) != 0;
 700         else
 701                 extended = (ahc->flags & AHC_EXTENDED_TRANS_B) != 0;
 702         if (extended && cylinders >= 1024) {
 703                 heads = 255;
 704                 sectors = 63;
 705                 cylinders = aic_sector_div(capacity, heads, sectors);
 706         }
 707         geom[0] = heads;
 708         geom[1] = sectors;
 709         geom[2] = cylinders;
 710         return (0);
 711 }
 712 #endif
 713
 714 /*
 715  * Abort the current SCSI command(s).
 716  */
 717 static int
 718 ahc_linux_abort(struct scsi_cmnd *cmd)
 719 {
 720         int error;
 721
 722         error = ahc_linux_queue_recovery_cmd(cmd, SCB_ABORT);
 723         if (error != 0)
 724                 printf("aic7xxx_abort returns 0x%x\n", error);
 725         return (error);
 726 }
 727
 728 /*
 729  * Attempt to send a target reset message to the device that timed out.
 730  */
 731 static int
 732 ahc_linux_dev_reset(struct scsi_cmnd *cmd)
 733 {
 734         int error;
 735
 736         error = ahc_linux_queue_recovery_cmd(cmd, SCB_DEVICE_RESET);
 737         if (error != 0)
 738                 printf("aic7xxx_dev_reset returns 0x%x\n", error);
 739         return (error);
 740 }
 741
 742 /*
 743  * Reset the SCSI bus.
 744  */
 745 static int
 746 ahc_linux_bus_reset(struct scsi_cmnd *cmd)
 747 {
 748         struct ahc_softc *ahc;
 749         int    found;
 750         unsigned long flags;
 751
 752         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
 753
 754         ahc_lock(ahc, &flags);
 755         found = ahc_reset_channel(ahc, scmd_channel(cmd) + 'A',
 756                                   /*initiate reset*/TRUE);
 757         ahc_unlock(ahc, &flags);
 758
 759         if (bootverbose)
 760                 printf("%s: SCSI bus reset delivered. "
 761                        "%d SCBs aborted.\n", ahc_name(ahc), found);
 762
 763         return SUCCESS;
 764 }
 765
 766 struct scsi_host_template aic7xxx_driver_template = {
 767         .module                 = THIS_MODULE,
 768         .name                   = "aic7xxx",
 769         .proc_name              = "aic7xxx",
 770         .proc_info              = ahc_linux_proc_info,
 771         .info                   = ahc_linux_info,
 772         .queuecommand           = ahc_linux_queue,
 773         .eh_abort_handler       = ahc_linux_abort,
 774         .eh_device_reset_handler = ahc_linux_dev_reset,
 775         .eh_bus_reset_handler   = ahc_linux_bus_reset,
 776 #if defined(__i386__)
 777         .bios_param             = ahc_linux_biosparam,
 778 #endif
 779         .can_queue              = AHC_MAX_QUEUE,
 780         .this_id                = -1,
 781         .cmd_per_lun            = 2,
 782         .use_clustering         = ENABLE_CLUSTERING,
 783         .slave_alloc            = ahc_linux_slave_alloc,
 784         .slave_configure        = ahc_linux_slave_configure,
 785         .slave_destroy          = ahc_linux_slave_destroy,
 786         .target_alloc           = ahc_linux_target_alloc,
 787         .target_destroy         = ahc_linux_target_destroy,
 788 };
 789
 790 /**************************** Tasklet Handler *********************************/
 791
 792 /******************************** Macros **************************************/
 793 #define BUILD_SCSIID(ahc, cmd)                                              \
 794         ((((cmd)->device->id << TID_SHIFT) & TID)                           \
 795         | (((cmd)->device->channel == 0) ? (ahc)->our_id : (ahc)->our_id_b) \
 796         | (((cmd)->device->channel == 0) ? 0 : TWIN_CHNLB))
 797
 798 /******************************** Bus DMA *************************************/
 799 int
 800 ahc_dma_tag_create(struct ahc_softc *ahc, bus_dma_tag_t parent,
 801                    bus_size_t alignment, bus_size_t boundary,
 802                    dma_addr_t lowaddr, dma_addr_t highaddr,
 803                    bus_dma_filter_t *filter, void *filterarg,
 804                    bus_size_t maxsize, int nsegments,
 805                    bus_size_t maxsegsz, int flags, bus_dma_tag_t *ret_tag)
 806 {
 807         bus_dma_tag_t dmat;
 808
 809         dmat = malloc(sizeof(*dmat), M_DEVBUF, M_NOWAIT);
 810         if (dmat == NULL)
 811                 return (ENOMEM);
 812
 813         /*
 814          * Linux is very simplistic about DMA memory.  For now don't
 815          * maintain all specification information.  Once Linux supplies
 816          * better facilities for doing these operations, or the
 817          * needs of this particular driver change, we might need to do
 818          * more here.
 819          */
 820         dmat->alignment = alignment;
 821         dmat->boundary = boundary;
 822         dmat->maxsize = maxsize;
 823         *ret_tag = dmat;
 824         return (0);
 825 }
 826
 827 void
 828 ahc_dma_tag_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat)
 829 {
 830         free(dmat, M_DEVBUF);
 831 }
 832
 833 int
 834 ahc_dmamem_alloc(struct ahc_softc *ahc, bus_dma_tag_t dmat, void** vaddr,
 835                  int flags, bus_dmamap_t *mapp)
 836 {
 837         *vaddr = pci_alloc_consistent(ahc->dev_softc,
 838                                       dmat->maxsize, mapp);
 839         if (*vaddr == NULL)
 840                 return ENOMEM;
 841         return 0;
 842 }
 843
 844 void
 845 ahc_dmamem_free(struct ahc_softc *ahc, bus_dma_tag_t dmat,
 846                 void* vaddr, bus_dmamap_t map)
 847 {
 848         pci_free_consistent(ahc->dev_softc, dmat->maxsize,
 849                             vaddr, map);
 850 }
 851
 852 int
 853 ahc_dmamap_load(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map,
 854                 void *buf, bus_size_t buflen, bus_dmamap_callback_t *cb,
 855                 void *cb_arg, int flags)
 856 {
 857         /*
 858          * Assume for now that this will only be used during
 859          * initialization and not for per-transaction buffer mapping.
 860          */
 861         bus_dma_segment_t stack_sg;
 862
 863         stack_sg.ds_addr = map;
 864         stack_sg.ds_len = dmat->maxsize;
 865         cb(cb_arg, &stack_sg, /*nseg*/1, /*error*/0);
 866         return (0);
 867 }
 868
 869 void
 870 ahc_dmamap_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
 871 {
 872 }
 873
 874 int
 875 ahc_dmamap_unload(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
 876 {
 877         /* Nothing to do */
 878         return (0);
 879 }
 880
 881 static void
 882 ahc_linux_setup_tag_info_global(char *p)
 883 {
 884         int tags, i, j;
 885
 886         tags = simple_strtoul(p + 1, NULL, 0) & 0xff;
 887         printf("Setting Global Tags= %d\n", tags);
 888
 889         for (i = 0; i < NUM_ELEMENTS(aic7xxx_tag_info); i++) {
 890                 for (j = 0; j < AHC_NUM_TARGETS; j++) {
 891                         aic7xxx_tag_info[i].tag_commands[j] = tags;
 892                 }
 893         }
 894 }
 895
 896 static void
 897 ahc_linux_setup_tag_info(u_long arg, int instance, int targ, int32_t value)
 898 {
 899
 900         if ((instance >= 0) && (targ >= 0)
 901          && (instance < NUM_ELEMENTS(aic7xxx_tag_info))
 902          && (targ < AHC_NUM_TARGETS)) {
 903                 aic7xxx_tag_info[instance].tag_commands[targ] = value & 0xff;
 904                 if (bootverbose)
 905                         printf("tag_info[%d:%d] = %d\n", instance, targ, value);
 906         }
 907 }
 908
 909 static char *
 910 ahc_parse_brace_option(char *opt_name, char *opt_arg, char *end, int depth,
 911                        void (*callback)(u_long, int, int, int32_t),
 912                        u_long callback_arg)
 913 {
 914         char    *tok_end;
 915         char    *tok_end2;
 916         int      i;
 917         int      instance;
 918         int      targ;
 919         int      done;
 920         char     tok_list[] = {'.', ',', '{', '}', '\0'};
 921
 922         /* All options use a ':' name/arg separator */
 923         if (*opt_arg != ':')
 924                 return (opt_arg);
 925         opt_arg++;
 926         instance = -1;
 927         targ = -1;
 928         done = FALSE;
 929         /*
 930          * Restore separator that may be in
 931          * the middle of our option argument.
 932          */
 933         tok_end = strchr(opt_arg, '\0');
 934         if (tok_end < end)
 935                 *tok_end = ',';
 936         while (!done) {
 937                 switch (*opt_arg) {
 938                 case '{':
 939                         if (instance == -1) {
 940                                 instance = 0;
 941                         } else {
 942                                 if (depth > 1) {
 943                                         if (targ == -1)
 944                                                 targ = 0;
 945                                 } else {
 946                                         printf("Malformed Option %s\n",
 947                                                opt_name);
 948                                         done = TRUE;
 949                                 }
 950                         }
 951                         opt_arg++;
 952                         break;
 953                 case '}':
 954                         if (targ != -1)
 955                                 targ = -1;
 956                         else if (instance != -1)
 957                                 instance = -1;
 958                         opt_arg++;
 959                         break;
 960                 case ',':
 961                 case '.':
 962                         if (instance == -1)
 963                                 done = TRUE;
 964                         else if (targ >= 0)
 965                                 targ++;
 966                         else if (instance >= 0)
 967                                 instance++;
 968                         opt_arg++;
 969                         break;
 970                 case '\0':
 971                         done = TRUE;
 972                         break;
 973                 default:
 974                         tok_end = end;
 975                         for (i = 0; tok_list[i]; i++) {
 976                                 tok_end2 = strchr(opt_arg, tok_list[i]);
 977                                 if ((tok_end2) && (tok_end2 < tok_end))
 978                                         tok_end = tok_end2;
 979                         }
 980                         callback(callback_arg, instance, targ,
 981                                  simple_strtol(opt_arg, NULL, 0));
 982                         opt_arg = tok_end;
 983                         break;
 984                 }
 985         }
 986         return (opt_arg);
 987 }
 988
 989 /*
 990  * Handle Linux boot parameters. This routine allows for assigning a value
 991  * to a parameter with a ':' between the parameter and the value.
 992  * ie. aic7xxx=stpwlev:1,extended
 993  */
 994 static int
 995 aic7xxx_setup(char *s)
 996 {
 997         int     i, n;
 998         char   *p;
 999         char   *end;
1000
1001         static struct {
1002                 const char *name;
1003                 uint32_t *flag;
1004         } options[] = {
1005                 { "extended", &aic7xxx_extended },
1006                 { "no_reset", &aic7xxx_no_reset },
1007                 { "verbose", &aic7xxx_verbose },
1008                 { "allow_memio", &aic7xxx_allow_memio},
1009 #ifdef AHC_DEBUG
1010                 { "debug", &ahc_debug },
1011 #endif
1012                 { "periodic_otag", &aic7xxx_periodic_otag },
1013                 { "pci_parity", &aic7xxx_pci_parity },
1014                 { "seltime", &aic7xxx_seltime },
1015                 { "tag_info", NULL },
1016                 { "global_tag_depth", NULL },
1017                 { "dv", NULL }
1018         };
1019
1020         end = strchr(s, '\0');
1021
1022         /*
1023          * XXX ia64 gcc isn't smart enough to know that NUM_ELEMENTS
1024          * will never be 0 in this case.
1025          */
1026         n = 0;
1027
1028         while ((p = strsep(&s, ",.")) != NULL) {
1029                 if (*p == '\0')
1030                         continue;
1031                 for (i = 0; i < NUM_ELEMENTS(options); i++) {
1032
1033                         n = strlen(options[i].name);
1034                         if (strncmp(options[i].name, p, n) == 0)
1035                                 break;
1036                 }
1037                 if (i == NUM_ELEMENTS(options))
1038                         continue;
1039
1040                 if (strncmp(p, "global_tag_depth", n) == 0) {
1041                         ahc_linux_setup_tag_info_global(p + n);
1042                 } else if (strncmp(p, "tag_info", n) == 0) {
1043                         s = ahc_parse_brace_option("tag_info", p + n, end,
1044                             2, ahc_linux_setup_tag_info, 0);
1045                 } else if (p[n] == ':') {
1046                         *(options[i].flag) = simple_strtoul(p + n + 1, NULL, 0);
1047                 } else if (strncmp(p, "verbose", n) == 0) {
1048                         *(options[i].flag) = 1;
1049                 } else {
1050                         *(options[i].flag) ^= 0xFFFFFFFF;
1051                 }
1052         }
1053         return 1;
1054 }
1055
1056 __setup("aic7xxx=", aic7xxx_setup);
1057
1058 uint32_t aic7xxx_verbose;
1059
1060 int
1061 ahc_linux_register_host(struct ahc_softc *ahc, struct scsi_host_template *template)
1062 {
1063         char    buf[80];
1064         struct  Scsi_Host *host;
1065         char    *new_name;
1066         u_long  s;
1067         int     retval;
1068
1069         template->name = ahc->description;
1070         host = scsi_host_alloc(template, sizeof(struct ahc_softc *));
1071         if (host == NULL)
1072                 return (ENOMEM);
1073
1074         *((struct ahc_softc **)host->hostdata) = ahc;
1075         ahc->platform_data->host = host;
1076         host->can_queue = AHC_MAX_QUEUE;
1077         host->cmd_per_lun = 2;
1078         /* XXX No way to communicate the ID for multiple channels */
1079         host->this_id = ahc->our_id;
1080         host->irq = ahc->platform_data->irq;
1081         host->max_id = (ahc->features & AHC_WIDE) ? 16 : 8;
1082         host->max_lun = AHC_NUM_LUNS;
1083         host->max_channel = (ahc->features & AHC_TWIN) ? 1 : 0;
1084         host->sg_tablesize = AHC_NSEG;
1085         ahc_lock(ahc, &s);
1086         ahc_set_unit(ahc, ahc_linux_unit++);
1087         ahc_unlock(ahc, &s);
1088         sprintf(buf, "scsi%d", host->host_no);
1089         new_name = malloc(strlen(buf) + 1, M_DEVBUF, M_NOWAIT);
1090         if (new_name != NULL) {
1091                 strcpy(new_name, buf);
1092                 ahc_set_name(ahc, new_name);
1093         }
1094         host->unique_id = ahc->unit;
1095         ahc_linux_initialize_scsi_bus(ahc);
1096         ahc_intr_enable(ahc, TRUE);
1097
1098         host->transportt = ahc_linux_transport_template;
1099
1100         retval = scsi_add_host(host,
1101                         (ahc->dev_softc ? &ahc->dev_softc->dev : NULL));
1102         if (retval) {
1103                 printk(KERN_WARNING "aic7xxx: scsi_add_host failed\n");
1104                 scsi_host_put(host);
1105                 return retval;
1106         }
1107
1108         scsi_scan_host(host);
1109         return 0;
1110 }
1111
1112 /*
1113  * Place the SCSI bus into a known state by either resetting it,
1114  * or forcing transfer negotiations on the next command to any
1115  * target.
1116  */
1117 void
1118 ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc)
1119 {
1120         int i;
1121         int numtarg;
1122         unsigned long s;
1123
1124         i = 0;
1125         numtarg = 0;
1126
1127         ahc_lock(ahc, &s);
1128
1129         if (aic7xxx_no_reset != 0)
1130                 ahc->flags &= ~(AHC_RESET_BUS_A|AHC_RESET_BUS_B);
1131
1132         if ((ahc->flags & AHC_RESET_BUS_A) != 0)
1133                 ahc_reset_channel(ahc, 'A', /*initiate_reset*/TRUE);
1134         else
1135                 numtarg = (ahc->features & AHC_WIDE) ? 16 : 8;
1136
1137         if ((ahc->features & AHC_TWIN) != 0) {
1138
1139                 if ((ahc->flags & AHC_RESET_BUS_B) != 0) {
1140                         ahc_reset_channel(ahc, 'B', /*initiate_reset*/TRUE);
1141                 } else {
1142                         if (numtarg == 0)
1143                                 i = 8;
1144                         numtarg += 8;
1145                 }
1146         }
1147
1148         /*
1149          * Force negotiation to async for all targets that
1150          * will not see an initial bus reset.
1151          */
1152         for (; i < numtarg; i++) {
1153                 struct ahc_devinfo devinfo;
1154                 struct ahc_initiator_tinfo *tinfo;
1155                 struct ahc_tmode_tstate *tstate;
1156                 u_int our_id;
1157                 u_int target_id;
1158                 char channel;
1159
1160                 channel = 'A';
1161                 our_id = ahc->our_id;
1162                 target_id = i;
1163                 if (i > 7 && (ahc->features & AHC_TWIN) != 0) {
1164                         channel = 'B';
1165                         our_id = ahc->our_id_b;
1166                         target_id = i % 8;
1167                 }
1168                 tinfo = ahc_fetch_transinfo(ahc, channel, our_id,
1169                                             target_id, &tstate);
1170                 ahc_compile_devinfo(&devinfo, our_id, target_id,
1171                                     CAM_LUN_WILDCARD, channel, ROLE_INITIATOR);
1172                 ahc_update_neg_request(ahc, &devinfo, tstate,
1173                                        tinfo, AHC_NEG_ALWAYS);
1174         }
1175         ahc_unlock(ahc, &s);
1176         /* Give the bus some time to recover */
1177         if ((ahc->flags & (AHC_RESET_BUS_A|AHC_RESET_BUS_B)) != 0) {
1178                 ahc_linux_freeze_simq(ahc);
1179                 msleep(AIC7XXX_RESET_DELAY);
1180                 ahc_linux_release_simq(ahc);
1181         }
1182 }
1183
1184 int
1185 ahc_platform_alloc(struct ahc_softc *ahc, void *platform_arg)
1186 {
1187
1188         ahc->platform_data =
1189             malloc(sizeof(struct ahc_platform_data), M_DEVBUF, M_NOWAIT);
1190         if (ahc->platform_data == NULL)
1191                 return (ENOMEM);
1192         memset(ahc->platform_data, 0, sizeof(struct ahc_platform_data));
1193         ahc->platform_data->irq = AHC_LINUX_NOIRQ;
1194         ahc_lockinit(ahc);
1195         ahc->seltime = (aic7xxx_seltime & 0x3) << 4;
1196         ahc->seltime_b = (aic7xxx_seltime & 0x3) << 4;
1197         if (aic7xxx_pci_parity == 0)
1198                 ahc->flags |= AHC_DISABLE_PCI_PERR;
1199
1200         return (0);
1201 }
1202
1203 void
1204 ahc_platform_free(struct ahc_softc *ahc)
1205 {
1206         struct scsi_target *starget;
1207         int i, j;
1208
1209         if (ahc->platform_data != NULL) {
1210                 /* destroy all of the device and target objects */
1211                 for (i = 0; i < AHC_NUM_TARGETS; i++) {
1212                         starget = ahc->platform_data->starget[i];
1213                         if (starget != NULL) {
1214                                 for (j = 0; j < AHC_NUM_LUNS; j++) {
1215                                         struct ahc_linux_target *targ =
1216                                                 scsi_transport_target_data(starget);
1217
1218                                         if (targ->sdev[j] == NULL)
1219                                                 continue;
1220                                         targ->sdev[j] = NULL;
1221                                 }
1222                                 ahc->platform_data->starget[i] = NULL;
1223                         }
1224                 }
1225
1226                 if (ahc->platform_data->irq != AHC_LINUX_NOIRQ)
1227                         free_irq(ahc->platform_data->irq, ahc);
1228                 if (ahc->tag == BUS_SPACE_PIO
1229                  && ahc->bsh.ioport != 0)
1230                         release_region(ahc->bsh.ioport, 256);
1231                 if (ahc->tag == BUS_SPACE_MEMIO
1232                  && ahc->bsh.maddr != NULL) {
1233                         iounmap(ahc->bsh.maddr);
1234                         release_mem_region(ahc->platform_data->mem_busaddr,
1235                                            0x1000);
1236                 }
1237
1238                 if (ahc->platform_data->host)
1239                         scsi_host_put(ahc->platform_data->host);
1240
1241                 free(ahc->platform_data, M_DEVBUF);
1242         }
1243 }
1244
1245 void
1246 ahc_platform_freeze_devq(struct ahc_softc *ahc, struct scb *scb)
1247 {
1248         ahc_platform_abort_scbs(ahc, SCB_GET_TARGET(ahc, scb),
1249                                 SCB_GET_CHANNEL(ahc, scb),
1250                                 SCB_GET_LUN(scb), SCB_LIST_NULL,
1251                                 ROLE_UNKNOWN, CAM_REQUEUE_REQ);
1252 }
1253
1254 void
1255 ahc_platform_set_tags(struct ahc_softc *ahc, struct ahc_devinfo *devinfo,
1256                       ahc_queue_alg alg)
1257 {
1258         struct scsi_target *starget;
1259         struct ahc_linux_target *targ;
1260         struct ahc_linux_device *dev;
1261         struct scsi_device *sdev;
1262         u_int target_offset;
1263         int was_queuing;
1264         int now_queuing;
1265
1266         target_offset = devinfo->target;
1267         if (devinfo->channel != 'A')
1268                 target_offset += 8;
1269         starget = ahc->platform_data->starget[target_offset];
1270         targ = scsi_transport_target_data(starget);
1271         BUG_ON(targ == NULL);
1272         sdev = targ->sdev[devinfo->lun];
1273         if (sdev == NULL)
1274                 return;
1275         dev = scsi_transport_device_data(sdev);
1276
1277         was_queuing = dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED);
1278         switch (alg) {
1279         default:
1280         case AHC_QUEUE_NONE:
1281                 now_queuing = 0;
1282                 break;
1283         case AHC_QUEUE_BASIC:
1284                 now_queuing = AHC_DEV_Q_BASIC;
1285                 break;
1286         case AHC_QUEUE_TAGGED:
1287                 now_queuing = AHC_DEV_Q_TAGGED;
1288                 break;
1289         }
1290         if ((dev->flags & AHC_DEV_FREEZE_TIL_EMPTY) == 0
1291          && (was_queuing != now_queuing)
1292          && (dev->active != 0)) {
1293                 dev->flags |= AHC_DEV_FREEZE_TIL_EMPTY;
1294                 dev->qfrozen++;
1295         }
1296
1297         dev->flags &= ~(AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED|AHC_DEV_PERIODIC_OTAG);
1298         if (now_queuing) {
1299                 u_int usertags;
1300
1301                 usertags = ahc_linux_user_tagdepth(ahc, devinfo);
1302                 if (!was_queuing) {
1303                         /*
1304                          * Start out agressively and allow our
1305                          * dynamic queue depth algorithm to take
1306                          * care of the rest.
1307                          */
1308                         dev->maxtags = usertags;
1309                         dev->openings = dev->maxtags - dev->active;
1310                 }
1311                 if (dev->maxtags == 0) {
1312                         /*
1313                          * Queueing is disabled by the user.
1314                          */
1315                         dev->openings = 1;
1316                 } else if (alg == AHC_QUEUE_TAGGED) {
1317                         dev->flags |= AHC_DEV_Q_TAGGED;
1318                         if (aic7xxx_periodic_otag != 0)
1319                                 dev->flags |= AHC_DEV_PERIODIC_OTAG;
1320                 } else
1321                         dev->flags |= AHC_DEV_Q_BASIC;
1322         } else {
1323                 /* We can only have one opening. */
1324                 dev->maxtags = 0;
1325                 dev->openings =  1 - dev->active;
1326         }
1327         switch ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED))) {
1328         case AHC_DEV_Q_BASIC:
1329                 scsi_set_tag_type(sdev, MSG_SIMPLE_TAG);
1330                 scsi_activate_tcq(sdev, dev->openings + dev->active);
1331                 break;
1332         case AHC_DEV_Q_TAGGED:
1333                 scsi_set_tag_type(sdev, MSG_ORDERED_TAG);
1334                 scsi_activate_tcq(sdev, dev->openings + dev->active);
1335                 break;
1336         default:
1337                 /*
1338                  * We allow the OS to queue 2 untagged transactions to
1339                  * us at any time even though we can only execute them
1340                  * serially on the controller/device.  This should
1341                  * remove some latency.
1342                  */
1343                 scsi_deactivate_tcq(sdev, 2);
1344                 break;
1345         }
1346 }
1347
1348 int
1349 ahc_platform_abort_scbs(struct ahc_softc *ahc, int target, char channel,
1350                         int lun, u_int tag, role_t role, uint32_t status)
1351 {
1352         return 0;
1353 }
1354
1355 static u_int
1356 ahc_linux_user_tagdepth(struct ahc_softc *ahc, struct ahc_devinfo *devinfo)
1357 {
1358         static int warned_user;
1359         u_int tags;
1360
1361         tags = 0;
1362         if ((ahc->user_discenable & devinfo->target_mask) != 0) {
1363                 if (ahc->unit >= NUM_ELEMENTS(aic7xxx_tag_info)) {
1364                         if (warned_user == 0) {
1365
1366                                 printf(KERN_WARNING
1367 "aic7xxx: WARNING: Insufficient tag_info instances\n"
1368 "aic7xxx: for installed controllers. Using defaults\n"
1369 "aic7xxx: Please update the aic7xxx_tag_info array in\n"
1370 "aic7xxx: the aic7xxx_osm..c source file.\n");
1371                                 warned_user++;
1372                         }
1373                         tags = AHC_MAX_QUEUE;
1374                 } else {
1375                         adapter_tag_info_t *tag_info;
1376
1377                         tag_info = &aic7xxx_tag_info[ahc->unit];
1378                         tags = tag_info->tag_commands[devinfo->target_offset];
1379                         if (tags > AHC_MAX_QUEUE)
1380                                 tags = AHC_MAX_QUEUE;
1381                 }
1382         }
1383         return (tags);
1384 }
1385
1386 /*
1387  * Determines the queue depth for a given device.
1388  */
1389 static void
1390 ahc_linux_device_queue_depth(struct scsi_device *sdev)
1391 {
1392         struct  ahc_devinfo devinfo;
1393         u_int   tags;
1394         struct ahc_softc *ahc = *((struct ahc_softc **)sdev->host->hostdata);
1395
1396         ahc_compile_devinfo(&devinfo,
1397                             sdev->sdev_target->channel == 0
1398                           ? ahc->our_id : ahc->our_id_b,
1399                             sdev->sdev_target->id, sdev->lun,
1400                             sdev->sdev_target->channel == 0 ? 'A' : 'B',
1401                             ROLE_INITIATOR);
1402         tags = ahc_linux_user_tagdepth(ahc, &devinfo);
1403         if (tags != 0 && sdev->tagged_supported != 0) {
1404
1405                 ahc_set_tags(ahc, &devinfo, AHC_QUEUE_TAGGED);
1406                 ahc_print_devinfo(ahc, &devinfo);
1407                 printf("Tagged Queuing enabled.  Depth %d\n", tags);
1408         } else {
1409                 ahc_set_tags(ahc, &devinfo, AHC_QUEUE_NONE);
1410         }
1411 }
1412
1413 static int
1414 ahc_linux_run_command(struct ahc_softc *ahc, struct ahc_linux_device *dev,
1415                       struct scsi_cmnd *cmd)
1416 {
1417         struct   scb *scb;
1418         struct   hardware_scb *hscb;
1419         struct   ahc_initiator_tinfo *tinfo;
1420         struct   ahc_tmode_tstate *tstate;
1421         uint16_t mask;
1422         struct scb_tailq *untagged_q = NULL;
1423
1424         /*
1425          * Schedule us to run later.  The only reason we are not
1426          * running is because the whole controller Q is frozen.
1427          */
1428         if (ahc->platform_data->qfrozen != 0)
1429                 return SCSI_MLQUEUE_HOST_BUSY;
1430
1431         /*
1432          * We only allow one untagged transaction
1433          * per target in the initiator role unless
1434          * we are storing a full busy target *lun*
1435          * table in SCB space.
1436          */
1437         if (!blk_rq_tagged(cmd->request)
1438             && (ahc->features & AHC_SCB_BTT) == 0) {
1439                 int target_offset;
1440
1441                 target_offset = cmd->device->id + cmd->device->channel * 8;
1442                 untagged_q = &(ahc->untagged_queues[target_offset]);
1443                 if (!TAILQ_EMPTY(untagged_q))
1444                         /* if we're already executing an untagged command
1445                          * we're busy to another */
1446                         return SCSI_MLQUEUE_DEVICE_BUSY;
1447         }
1448
1449         /*
1450          * Get an scb to use.
1451          */
1452         scb = ahc_get_scb(ahc);
1453         if (!scb)
1454                 return SCSI_MLQUEUE_HOST_BUSY;
1455
1456         scb->io_ctx = cmd;
1457         scb->platform_data->dev = dev;
1458         hscb = scb->hscb;
1459         cmd->host_scribble = (char *)scb;
1460
1461         /*
1462          * Fill out basics of the HSCB.
1463          */
1464         hscb->control = 0;
1465         hscb->scsiid = BUILD_SCSIID(ahc, cmd);
1466         hscb->lun = cmd->device->lun;
1467         mask = SCB_GET_TARGET_MASK(ahc, scb);
1468         tinfo = ahc_fetch_transinfo(ahc, SCB_GET_CHANNEL(ahc, scb),
1469                                     SCB_GET_OUR_ID(scb),
1470                                     SCB_GET_TARGET(ahc, scb), &tstate);
1471         hscb->scsirate = tinfo->scsirate;
1472         hscb->scsioffset = tinfo->curr.offset;
1473         if ((tstate->ultraenb & mask) != 0)
1474                 hscb->control |= ULTRAENB;
1475
1476         if ((ahc->user_discenable & mask) != 0)
1477                 hscb->control |= DISCENB;
1478
1479         if ((tstate->auto_negotiate & mask) != 0) {
1480                 scb->flags |= SCB_AUTO_NEGOTIATE;
1481                 scb->hscb->control |= MK_MESSAGE;
1482         }
1483
1484         if ((dev->flags & (AHC_DEV_Q_TAGGED|AHC_DEV_Q_BASIC)) != 0) {
1485                 int     msg_bytes;
1486                 uint8_t tag_msgs[2];
1487
1488                 msg_bytes = scsi_populate_tag_msg(cmd, tag_msgs);
1489                 if (msg_bytes && tag_msgs[0] != MSG_SIMPLE_TASK) {
1490                         hscb->control |= tag_msgs[0];
1491                         if (tag_msgs[0] == MSG_ORDERED_TASK)
1492                                 dev->commands_since_idle_or_otag = 0;
1493                 } else if (dev->commands_since_idle_or_otag == AHC_OTAG_THRESH
1494                                 && (dev->flags & AHC_DEV_Q_TAGGED) != 0) {
1495                         hscb->control |= MSG_ORDERED_TASK;
1496                         dev->commands_since_idle_or_otag = 0;
1497                 } else {
1498                         hscb->control |= MSG_SIMPLE_TASK;
1499                 }
1500         }
1501
1502         hscb->cdb_len = cmd->cmd_len;
1503         if (hscb->cdb_len <= 12) {
1504                 memcpy(hscb->shared_data.cdb, cmd->cmnd, hscb->cdb_len);
1505         } else {
1506                 memcpy(hscb->cdb32, cmd->cmnd, hscb->cdb_len);
1507                 scb->flags |= SCB_CDB32_PTR;
1508         }
1509
1510         scb->platform_data->xfer_len = 0;
1511         ahc_set_residual(scb, 0);
1512         ahc_set_sense_residual(scb, 0);
1513         scb->sg_count = 0;
1514         if (cmd->use_sg != 0) {
1515                 struct  ahc_dma_seg *sg;
1516                 struct  scatterlist *cur_seg;
1517                 struct  scatterlist *end_seg;
1518                 int     nseg;
1519
1520                 cur_seg = (struct scatterlist *)cmd->request_buffer;
1521                 nseg = pci_map_sg(ahc->dev_softc, cur_seg, cmd->use_sg,
1522                                   cmd->sc_data_direction);
1523                 end_seg = cur_seg + nseg;
1524                 /* Copy the segments into the SG list. */
1525                 sg = scb->sg_list;
1526                 /*
1527                  * The sg_count may be larger than nseg if
1528                  * a transfer crosses a 32bit page.
1529                  */
1530                 while (cur_seg < end_seg) {
1531                         dma_addr_t addr;
1532                         bus_size_t len;
1533                         int consumed;
1534
1535                         addr = sg_dma_address(cur_seg);
1536                         len = sg_dma_len(cur_seg);
1537                         consumed = ahc_linux_map_seg(ahc, scb,
1538                                                      sg, addr, len);
1539                         sg += consumed;
1540                         scb->sg_count += consumed;
1541                         cur_seg++;
1542                 }
1543                 sg--;
1544                 sg->len |= ahc_htole32(AHC_DMA_LAST_SEG);
1545
1546                 /*
1547                  * Reset the sg list pointer.
1548                  */
1549                 scb->hscb->sgptr =
1550                         ahc_htole32(scb->sg_list_phys | SG_FULL_RESID);
1551
1552                 /*
1553                  * Copy the first SG into the "current"
1554                  * data pointer area.
1555                  */
1556                 scb->hscb->dataptr = scb->sg_list->addr;
1557                 scb->hscb->datacnt = scb->sg_list->len;
1558         } else if (cmd->request_bufflen != 0) {
1559                 struct   ahc_dma_seg *sg;
1560                 dma_addr_t addr;
1561
1562                 sg = scb->sg_list;
1563                 addr = pci_map_single(ahc->dev_softc,
1564                                       cmd->request_buffer,
1565                                       cmd->request_bufflen,
1566                                       cmd->sc_data_direction);
1567                 scb->platform_data->buf_busaddr = addr;
1568                 scb->sg_count = ahc_linux_map_seg(ahc, scb,
1569                                                   sg, addr,
1570                                                   cmd->request_bufflen);
1571                 sg->len |= ahc_htole32(AHC_DMA_LAST_SEG);
1572
1573                 /*
1574                  * Reset the sg list pointer.
1575                  */
1576                 scb->hscb->sgptr =
1577                         ahc_htole32(scb->sg_list_phys | SG_FULL_RESID);
1578
1579                 /*
1580                  * Copy the first SG into the "current"
1581                  * data pointer area.
1582                  */
1583                 scb->hscb->dataptr = sg->addr;
1584                 scb->hscb->datacnt = sg->len;
1585         } else {
1586                 scb->hscb->sgptr = ahc_htole32(SG_LIST_NULL);
1587                 scb->hscb->dataptr = 0;
1588                 scb->hscb->datacnt = 0;
1589                 scb->sg_count = 0;
1590         }
1591
1592         LIST_INSERT_HEAD(&ahc->pending_scbs, scb, pending_links);
1593         dev->openings--;
1594         dev->active++;
1595         dev->commands_issued++;
1596         if ((dev->flags & AHC_DEV_PERIODIC_OTAG) != 0)
1597                 dev->commands_since_idle_or_otag++;
1598
1599         scb->flags |= SCB_ACTIVE;
1600         if (untagged_q) {
1601                 TAILQ_INSERT_TAIL(untagged_q, scb, links.tqe);
1602                 scb->flags |= SCB_UNTAGGEDQ;
1603         }
1604         ahc_queue_scb(ahc, scb);
1605         return 0;
1606 }
1607
1608 /*
1609  * SCSI controller interrupt handler.
1610  */
1611 irqreturn_t
1612 ahc_linux_isr(int irq, void *dev_id, struct pt_regs * regs)
1613 {
1614         struct  ahc_softc *ahc;
1615         u_long  flags;
1616         int     ours;
1617
1618         ahc = (struct ahc_softc *) dev_id;
1619         ahc_lock(ahc, &flags);
1620         ours = ahc_intr(ahc);
1621         ahc_unlock(ahc, &flags);
1622         return IRQ_RETVAL(ours);
1623 }
1624
1625 void
1626 ahc_platform_flushwork(struct ahc_softc *ahc)
1627 {
1628
1629 }
1630
1631 void
1632 ahc_send_async(struct ahc_softc *ahc, char channel,
1633                u_int target, u_int lun, ac_code code, void *arg)
1634 {
1635         switch (code) {
1636         case AC_TRANSFER_NEG:
1637         {
1638                 char    buf[80];
1639                 struct  scsi_target *starget;
1640                 struct  ahc_linux_target *targ;
1641                 struct  info_str info;
1642                 struct  ahc_initiator_tinfo *tinfo;
1643                 struct  ahc_tmode_tstate *tstate;
1644                 int     target_offset;
1645                 unsigned int target_ppr_options;
1646
1647                 BUG_ON(target == CAM_TARGET_WILDCARD);
1648
1649                 info.buffer = buf;
1650                 info.length = sizeof(buf);
1651                 info.offset = 0;
1652                 info.pos = 0;
1653                 tinfo = ahc_fetch_transinfo(ahc, channel,
1654                                                 channel == 'A' ? ahc->our_id
1655                                                                : ahc->our_id_b,
1656                                                 target, &tstate);
1657
1658                 /*
1659                  * Don't bother reporting results while
1660                  * negotiations are still pending.
1661                  */
1662                 if (tinfo->curr.period != tinfo->goal.period
1663                  || tinfo->curr.width != tinfo->goal.width
1664                  || tinfo->curr.offset != tinfo->goal.offset
1665                  || tinfo->curr.ppr_options != tinfo->goal.ppr_options)
1666                         if (bootverbose == 0)
1667                                 break;
1668
1669                 /*
1670                  * Don't bother reporting results that
1671                  * are identical to those last reported.
1672                  */
1673                 target_offset = target;
1674                 if (channel == 'B')
1675                         target_offset += 8;
1676                 starget = ahc->platform_data->starget[target_offset];
1677                 if (starget == NULL)
1678                         break;
1679                 targ = scsi_transport_target_data(starget);
1680
1681                 target_ppr_options =
1682                         (spi_dt(starget) ? MSG_EXT_PPR_DT_REQ : 0)
1683                         + (spi_qas(starget) ? MSG_EXT_PPR_QAS_REQ : 0)
1684                         + (spi_iu(starget) ?  MSG_EXT_PPR_IU_REQ : 0);
1685
1686                 if (tinfo->curr.period == spi_period(starget)
1687                     && tinfo->curr.width == spi_width(starget)
1688                     && tinfo->curr.offset == spi_offset(starget)
1689                  && tinfo->curr.ppr_options == target_ppr_options)
1690                         if (bootverbose == 0)
1691                                 break;
1692
1693                 spi_period(starget) = tinfo->curr.period;
1694                 spi_width(starget) = tinfo->curr.width;
1695                 spi_offset(starget) = tinfo->curr.offset;
1696                 spi_dt(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_DT_REQ ? 1 : 0;
1697                 spi_qas(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_QAS_REQ ? 1 : 0;
1698                 spi_iu(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ ? 1 : 0;
1699                 spi_display_xfer_agreement(starget);
1700                 break;
1701         }
1702         case AC_SENT_BDR:
1703         {
1704                 WARN_ON(lun != CAM_LUN_WILDCARD);
1705                 scsi_report_device_reset(ahc->platform_data->host,
1706                                          channel - 'A', target);
1707                 break;
1708         }
1709         case AC_BUS_RESET:
1710                 if (ahc->platform_data->host != NULL) {
1711                         scsi_report_bus_reset(ahc->platform_data->host,
1712                                               channel - 'A');
1713                 }
1714                 break;
1715         default:
1716                 panic("ahc_send_async: Unexpected async event");
1717         }
1718 }
1719
1720 /*
1721  * Calls the higher level scsi done function and frees the scb.
1722  */
1723 void
1724 ahc_done(struct ahc_softc *ahc, struct scb *scb)
1725 {
1726         struct scsi_cmnd *cmd;
1727         struct     ahc_linux_device *dev;
1728
1729         LIST_REMOVE(scb, pending_links);
1730         if ((scb->flags & SCB_UNTAGGEDQ) != 0) {
1731                 struct scb_tailq *untagged_q;
1732                 int target_offset;
1733
1734                 target_offset = SCB_GET_TARGET_OFFSET(ahc, scb);
1735                 untagged_q = &(ahc->untagged_queues[target_offset]);
1736                 TAILQ_REMOVE(untagged_q, scb, links.tqe);
1737                 BUG_ON(!TAILQ_EMPTY(untagged_q));
1738         }
1739
1740         if ((scb->flags & SCB_ACTIVE) == 0) {
1741                 printf("SCB %d done'd twice\n", scb->hscb->tag);
1742                 ahc_dump_card_state(ahc);
1743                 panic("Stopping for safety");
1744         }
1745         cmd = scb->io_ctx;
1746         dev = scb->platform_data->dev;
1747         dev->active--;
1748         dev->openings++;
1749         if ((cmd->result & (CAM_DEV_QFRZN << 16)) != 0) {
1750                 cmd->result &= ~(CAM_DEV_QFRZN << 16);
1751                 dev->qfrozen--;
1752         }
1753         ahc_linux_unmap_scb(ahc, scb);
1754
1755         /*
1756          * Guard against stale sense data.
1757          * The Linux mid-layer assumes that sense
1758          * was retrieved anytime the first byte of
1759          * the sense buffer looks "sane".
1760          */
1761         cmd->sense_buffer[0] = 0;
1762         if (ahc_get_transaction_status(scb) == CAM_REQ_INPROG) {
1763                 uint32_t amount_xferred;
1764
1765                 amount_xferred =
1766                     ahc_get_transfer_length(scb) - ahc_get_residual(scb);
1767                 if ((scb->flags & SCB_TRANSMISSION_ERROR) != 0) {
1768 #ifdef AHC_DEBUG
1769                         if ((ahc_debug & AHC_SHOW_MISC) != 0) {
1770                                 ahc_print_path(ahc, scb);
1771                                 printf("Set CAM_UNCOR_PARITY\n");
1772                         }
1773 #endif
1774                         ahc_set_transaction_status(scb, CAM_UNCOR_PARITY);
1775 #ifdef AHC_REPORT_UNDERFLOWS
1776                 /*
1777                  * This code is disabled by default as some
1778                  * clients of the SCSI system do not properly
1779                  * initialize the underflow parameter.  This
1780                  * results in spurious termination of commands
1781                  * that complete as expected (e.g. underflow is
1782                  * allowed as command can return variable amounts
1783                  * of data.
1784                  */
1785                 } else if (amount_xferred < scb->io_ctx->underflow) {
1786                         u_int i;
1787
1788                         ahc_print_path(ahc, scb);
1789                         printf("CDB:");
1790                         for (i = 0; i < scb->io_ctx->cmd_len; i++)
1791                                 printf(" 0x%x", scb->io_ctx->cmnd[i]);
1792                         printf("\n");
1793                         ahc_print_path(ahc, scb);
1794                         printf("Saw underflow (%ld of %ld bytes). "
1795                                "Treated as error\n",
1796                                 ahc_get_residual(scb),
1797                                 ahc_get_transfer_length(scb));
1798                         ahc_set_transaction_status(scb, CAM_DATA_RUN_ERR);
1799 #endif
1800                 } else {
1801                         ahc_set_transaction_status(scb, CAM_REQ_CMP);
1802                 }
1803         } else if (ahc_get_transaction_status(scb) == CAM_SCSI_STATUS_ERROR) {
1804                 ahc_linux_handle_scsi_status(ahc, cmd->device, scb);
1805         }
1806
1807         if (dev->openings == 1
1808          && ahc_get_transaction_status(scb) == CAM_REQ_CMP
1809          && ahc_get_scsi_status(scb) != SCSI_STATUS_QUEUE_FULL)
1810                 dev->tag_success_count++;
1811         /*
1812          * Some devices deal with temporary internal resource
1813          * shortages by returning queue full.  When the queue
1814          * full occurrs, we throttle back.  Slowly try to get
1815          * back to our previous queue depth.
1816          */
1817         if ((dev->openings + dev->active) < dev->maxtags
1818          && dev->tag_success_count > AHC_TAG_SUCCESS_INTERVAL) {
1819                 dev->tag_success_count = 0;
1820                 dev->openings++;
1821         }
1822
1823         if (dev->active == 0)
1824                 dev->commands_since_idle_or_otag = 0;
1825
1826         if ((scb->flags & SCB_RECOVERY_SCB) != 0) {
1827                 printf("Recovery SCB completes\n");
1828                 if (ahc_get_transaction_status(scb) == CAM_BDR_SENT
1829                  || ahc_get_transaction_status(scb) == CAM_REQ_ABORTED)
1830                         ahc_set_transaction_status(scb, CAM_CMD_TIMEOUT);
1831
1832                 if (ahc->platform_data->eh_done)
1833                         complete(ahc->platform_data->eh_done);
1834         }
1835
1836         ahc_free_scb(ahc, scb);
1837         ahc_linux_queue_cmd_complete(ahc, cmd);
1838 }
1839
1840 static void
1841 ahc_linux_handle_scsi_status(struct ahc_softc *ahc,
1842                              struct scsi_device *sdev, struct scb *scb)
1843 {
1844         struct  ahc_devinfo devinfo;
1845         struct ahc_linux_device *dev = scsi_transport_device_data(sdev);
1846
1847         ahc_compile_devinfo(&devinfo,
1848                             ahc->our_id,
1849                             sdev->sdev_target->id, sdev->lun,
1850                             sdev->sdev_target->channel == 0 ? 'A' : 'B',
1851                             ROLE_INITIATOR);
1852
1853         /*
1854          * We don't currently trust the mid-layer to
1855          * properly deal with queue full or busy.  So,
1856          * when one occurs, we tell the mid-layer to
1857          * unconditionally requeue the command to us
1858          * so that we can retry it ourselves.  We also
1859          * implement our own throttling mechanism so
1860          * we don't clobber the device with too many
1861          * commands.
1862          */
1863         switch (ahc_get_scsi_status(scb)) {
1864         default:
1865                 break;
1866         case SCSI_STATUS_CHECK_COND:
1867         case SCSI_STATUS_CMD_TERMINATED:
1868         {
1869                 struct scsi_cmnd *cmd;
1870
1871                 /*
1872                  * Copy sense information to the OS's cmd
1873                  * structure if it is available.
1874                  */
1875                 cmd = scb->io_ctx;
1876                 if (scb->flags & SCB_SENSE) {
1877                         u_int sense_size;
1878
1879                         sense_size = MIN(sizeof(struct scsi_sense_data)
1880                                        - ahc_get_sense_residual(scb),
1881                                          sizeof(cmd->sense_buffer));
1882                         memcpy(cmd->sense_buffer,
1883                                ahc_get_sense_buf(ahc, scb), sense_size);
1884                         if (sense_size < sizeof(cmd->sense_buffer))
1885                                 memset(&cmd->sense_buffer[sense_size], 0,
1886                                        sizeof(cmd->sense_buffer) - sense_size);
1887                         cmd->result |= (DRIVER_SENSE << 24);
1888 #ifdef AHC_DEBUG
1889                         if (ahc_debug & AHC_SHOW_SENSE) {
1890                                 int i;
1891
1892                                 printf("Copied %d bytes of sense data:",
1893                                        sense_size);
1894                                 for (i = 0; i < sense_size; i++) {
1895                                         if ((i & 0xF) == 0)
1896                                                 printf("\n");
1897                                         printf("0x%x ", cmd->sense_buffer[i]);
1898                                 }
1899                                 printf("\n");
1900                         }
1901 #endif
1902                 }
1903                 break;
1904         }
1905         case SCSI_STATUS_QUEUE_FULL:
1906         {
1907                 /*
1908                  * By the time the core driver has returned this
1909                  * command, all other commands that were queued
1910                  * to us but not the device have been returned.
1911                  * This ensures that dev->active is equal to
1912                  * the number of commands actually queued to
1913                  * the device.
1914                  */
1915                 dev->tag_success_count = 0;
1916                 if (dev->active != 0) {
1917                         /*
1918                          * Drop our opening count to the number
1919                          * of commands currently outstanding.
1920                          */
1921                         dev->openings = 0;
1922 /*
1923                         ahc_print_path(ahc, scb);
1924                         printf("Dropping tag count to %d\n", dev->active);
1925  */
1926                         if (dev->active == dev->tags_on_last_queuefull) {
1927
1928                                 dev->last_queuefull_same_count++;
1929                                 /*
1930                                  * If we repeatedly see a queue full
1931                                  * at the same queue depth, this
1932                                  * device has a fixed number of tag
1933                                  * slots.  Lock in this tag depth
1934                                  * so we stop seeing queue fulls from
1935                                  * this device.
1936                                  */
1937                                 if (dev->last_queuefull_same_count
1938                                  == AHC_LOCK_TAGS_COUNT) {
1939                                         dev->maxtags = dev->active;
1940                                         ahc_print_path(ahc, scb);
1941                                         printf("Locking max tag count at %d\n",
1942                                                dev->active);
1943                                 }
1944                         } else {
1945                                 dev->tags_on_last_queuefull = dev->active;
1946                                 dev->last_queuefull_same_count = 0;
1947                         }
1948                         ahc_set_transaction_status(scb, CAM_REQUEUE_REQ);
1949                         ahc_set_scsi_status(scb, SCSI_STATUS_OK);
1950                         ahc_platform_set_tags(ahc, &devinfo,
1951                                      (dev->flags & AHC_DEV_Q_BASIC)
1952                                    ? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
1953                         break;
1954                 }
1955                 /*
1956                  * Drop down to a single opening, and treat this
1957                  * as if the target returned BUSY SCSI status.
1958                  */
1959                 dev->openings = 1;
1960                 ahc_set_scsi_status(scb, SCSI_STATUS_BUSY);
1961                 ahc_platform_set_tags(ahc, &devinfo,
1962                              (dev->flags & AHC_DEV_Q_BASIC)
1963                            ? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
1964                 break;
1965         }
1966         }
1967 }
1968
1969 static void
1970 ahc_linux_queue_cmd_complete(struct ahc_softc *ahc, struct scsi_cmnd *cmd)
1971 {
1972         /*
1973          * Map CAM error codes into Linux Error codes.  We
1974          * avoid the conversion so that the DV code has the
1975          * full error information available when making
1976          * state change decisions.
1977          */
1978         {
1979                 u_int new_status;
1980
1981                 switch (ahc_cmd_get_transaction_status(cmd)) {
1982                 case CAM_REQ_INPROG:
1983                 case CAM_REQ_CMP:
1984                 case CAM_SCSI_STATUS_ERROR:
1985                         new_status = DID_OK;
1986                         break;
1987                 case CAM_REQ_ABORTED:
1988                         new_status = DID_ABORT;
1989                         break;
1990                 case CAM_BUSY:
1991                         new_status = DID_BUS_BUSY;
1992                         break;
1993                 case CAM_REQ_INVALID:
1994                 case CAM_PATH_INVALID:
1995                         new_status = DID_BAD_TARGET;
1996                         break;
1997                 case CAM_SEL_TIMEOUT:
1998                         new_status = DID_NO_CONNECT;
1999                         break;
2000                 case CAM_SCSI_BUS_RESET:
2001                 case CAM_BDR_SENT:
2002                         new_status = DID_RESET;
2003                         break;
2004                 case CAM_UNCOR_PARITY:
2005                         new_status = DID_PARITY;
2006                         break;
2007                 case CAM_CMD_TIMEOUT:
2008                         new_status = DID_TIME_OUT;
2009                         break;
2010                 case CAM_UA_ABORT:
2011                 case CAM_REQ_CMP_ERR:
2012                 case CAM_AUTOSENSE_FAIL:
2013                 case CAM_NO_HBA:
2014                 case CAM_DATA_RUN_ERR:
2015                 case CAM_UNEXP_BUSFREE:
2016                 case CAM_SEQUENCE_FAIL:
2017                 case CAM_CCB_LEN_ERR:
2018                 case CAM_PROVIDE_FAIL:
2019                 case CAM_REQ_TERMIO:
2020                 case CAM_UNREC_HBA_ERROR:
2021                 case CAM_REQ_TOO_BIG:
2022                         new_status = DID_ERROR;
2023                         break;
2024                 case CAM_REQUEUE_REQ:
2025                         new_status = DID_REQUEUE;
2026                         break;
2027                 default:
2028                         /* We should never get here */
2029                         new_status = DID_ERROR;
2030                         break;
2031                 }
2032
2033                 ahc_cmd_set_transaction_status(cmd, new_status);
2034         }
2035
2036         cmd->scsi_done(cmd);
2037 }
2038
2039 static void
2040 ahc_linux_freeze_simq(struct ahc_softc *ahc)
2041 {
2042         unsigned long s;
2043
2044         ahc_lock(ahc, &s);
2045         ahc->platform_data->qfrozen++;
2046         if (ahc->platform_data->qfrozen == 1) {
2047                 scsi_block_requests(ahc->platform_data->host);
2048
2049                 /* XXX What about Twin channels? */
2050                 ahc_platform_abort_scbs(ahc, CAM_TARGET_WILDCARD, ALL_CHANNELS,
2051                                         CAM_LUN_WILDCARD, SCB_LIST_NULL,
2052                                         ROLE_INITIATOR, CAM_REQUEUE_REQ);
2053         }
2054         ahc_unlock(ahc, &s);
2055 }
2056
2057 static void
2058 ahc_linux_release_simq(struct ahc_softc *ahc)
2059 {
2060         u_long s;
2061         int    unblock_reqs;
2062
2063         unblock_reqs = 0;
2064         ahc_lock(ahc, &s);
2065         if (ahc->platform_data->qfrozen > 0)
2066                 ahc->platform_data->qfrozen--;
2067         if (ahc->platform_data->qfrozen == 0)
2068                 unblock_reqs = 1;
2069         ahc_unlock(ahc, &s);
2070         /*
2071          * There is still a race here.  The mid-layer
2072          * should keep its own freeze count and use
2073          * a bottom half handler to run the queues
2074          * so we can unblock with our own lock held.
2075          */
2076         if (unblock_reqs)
2077                 scsi_unblock_requests(ahc->platform_data->host);
2078 }
2079
2080 static int
2081 ahc_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag)
2082 {
2083         struct ahc_softc *ahc;
2084         struct ahc_linux_device *dev;
2085         struct scb *pending_scb;
2086         u_int  saved_scbptr;
2087         u_int  active_scb_index;
2088         u_int  last_phase;
2089         u_int  saved_scsiid;
2090         u_int  cdb_byte;
2091         int    retval;
2092         int    was_paused;
2093         int    paused;
2094         int    wait;
2095         int    disconnected;
2096         unsigned long flags;
2097
2098         pending_scb = NULL;
2099         paused = FALSE;
2100         wait = FALSE;
2101         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
2102
2103         scmd_printk(KERN_INFO, cmd, "Attempting to queue a%s message\n",
2104                flag == SCB_ABORT ? "n ABORT" : " TARGET RESET");
2105
2106         printf("CDB:");
2107         for (cdb_byte = 0; cdb_byte < cmd->cmd_len; cdb_byte++)
2108                 printf(" 0x%x", cmd->cmnd[cdb_byte]);
2109         printf("\n");
2110
2111         ahc_lock(ahc, &flags);
2112
2113         /*
2114          * First determine if we currently own this command.
2115          * Start by searching the device queue.  If not found
2116          * there, check the pending_scb list.  If not found
2117          * at all, and the system wanted us to just abort the
2118          * command, return success.
2119          */
2120         dev = scsi_transport_device_data(cmd->device);
2121
2122         if (dev == NULL) {
2123                 /*
2124                  * No target device for this command exists,
2125                  * so we must not still own the command.
2126                  */
2127                 printf("%s:%d:%d:%d: Is not an active device\n",
2128                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2129                        cmd->device->lun);
2130                 retval = SUCCESS;
2131                 goto no_cmd;
2132         }
2133
2134         if ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED)) == 0
2135          && ahc_search_untagged_queues(ahc, cmd, cmd->device->id,
2136                                        cmd->device->channel + 'A',
2137                                        cmd->device->lun,
2138                                        CAM_REQ_ABORTED, SEARCH_COMPLETE) != 0) {
2139                 printf("%s:%d:%d:%d: Command found on untagged queue\n",
2140                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2141                        cmd->device->lun);
2142                 retval = SUCCESS;
2143                 goto done;
2144         }
2145
2146         /*
2147          * See if we can find a matching cmd in the pending list.
2148          */
2149         LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
2150                 if (pending_scb->io_ctx == cmd)
2151                         break;
2152         }
2153
2154         if (pending_scb == NULL && flag == SCB_DEVICE_RESET) {
2155
2156                 /* Any SCB for this device will do for a target reset */
2157                 LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
2158                         if (ahc_match_scb(ahc, pending_scb, scmd_id(cmd),
2159                                           scmd_channel(cmd) + 'A',
2160                                           CAM_LUN_WILDCARD,
2161                                           SCB_LIST_NULL, ROLE_INITIATOR))
2162                                 break;
2163                 }
2164         }
2165
2166         if (pending_scb == NULL) {
2167                 scmd_printk(KERN_INFO, cmd, "Command not found\n");
2168                 goto no_cmd;
2169         }
2170
2171         if ((pending_scb->flags & SCB_RECOVERY_SCB) != 0) {
2172                 /*
2173                  * We can't queue two recovery actions using the same SCB
2174                  */
2175                 retval = FAILED;
2176                 goto  done;
2177         }
2178
2179         /*
2180          * Ensure that the card doesn't do anything
2181          * behind our back and that we didn't "just" miss
2182          * an interrupt that would affect this cmd.
2183          */
2184         was_paused = ahc_is_paused(ahc);
2185         ahc_pause_and_flushwork(ahc);
2186         paused = TRUE;
2187
2188         if ((pending_scb->flags & SCB_ACTIVE) == 0) {
2189                 scmd_printk(KERN_INFO, cmd, "Command already completed\n");
2190                 goto no_cmd;
2191         }
2192
2193         printf("%s: At time of recovery, card was %spaused\n",
2194                ahc_name(ahc), was_paused ? "" : "not ");
2195         ahc_dump_card_state(ahc);
2196
2197         disconnected = TRUE;
2198         if (flag == SCB_ABORT) {
2199                 if (ahc_search_qinfifo(ahc, cmd->device->id,
2200                                        cmd->device->channel + 'A',
2201                                        cmd->device->lun,
2202                                        pending_scb->hscb->tag,
2203                                        ROLE_INITIATOR, CAM_REQ_ABORTED,
2204                                        SEARCH_COMPLETE) > 0) {
2205                         printf("%s:%d:%d:%d: Cmd aborted from QINFIFO\n",
2206                                ahc_name(ahc), cmd->device->channel,
2207                                         cmd->device->id, cmd->device->lun);
2208                         retval = SUCCESS;
2209                         goto done;
2210                 }
2211         } else if (ahc_search_qinfifo(ahc, cmd->device->id,
2212                                       cmd->device->channel + 'A',
2213                                       cmd->device->lun, pending_scb->hscb->tag,
2214                                       ROLE_INITIATOR, /*status*/0,
2215                                       SEARCH_COUNT) > 0) {
2216                 disconnected = FALSE;
2217         }
2218
2219         if (disconnected && (ahc_inb(ahc, SEQ_FLAGS) & NOT_IDENTIFIED) == 0) {
2220                 struct scb *bus_scb;
2221
2222                 bus_scb = ahc_lookup_scb(ahc, ahc_inb(ahc, SCB_TAG));
2223                 if (bus_scb == pending_scb)
2224                         disconnected = FALSE;
2225                 else if (flag != SCB_ABORT
2226                       && ahc_inb(ahc, SAVED_SCSIID) == pending_scb->hscb->scsiid
2227                       && ahc_inb(ahc, SAVED_LUN) == SCB_GET_LUN(pending_scb))
2228                         disconnected = FALSE;
2229         }
2230
2231         /*
2232          * At this point, pending_scb is the scb associated with the
2233          * passed in command.  That command is currently active on the
2234          * bus, is in the disconnected state, or we're hoping to find
2235          * a command for the same target active on the bus to abuse to
2236          * send a BDR.  Queue the appropriate message based on which of
2237          * these states we are in.
2238          */
2239         last_phase = ahc_inb(ahc, LASTPHASE);
2240         saved_scbptr = ahc_inb(ahc, SCBPTR);
2241         active_scb_index = ahc_inb(ahc, SCB_TAG);
2242         saved_scsiid = ahc_inb(ahc, SAVED_SCSIID);
2243         if (last_phase != P_BUSFREE
2244          && (pending_scb->hscb->tag == active_scb_index
2245           || (flag == SCB_DEVICE_RESET
2246            && SCSIID_TARGET(ahc, saved_scsiid) == scmd_id(cmd)))) {
2247
2248                 /*
2249                  * We're active on the bus, so assert ATN
2250                  * and hope that the target responds.
2251                  */
2252                 pending_scb = ahc_lookup_scb(ahc, active_scb_index);
2253                 pending_scb->flags |= SCB_RECOVERY_SCB|flag;
2254                 ahc_outb(ahc, MSG_OUT, HOST_MSG);
2255                 ahc_outb(ahc, SCSISIGO, last_phase|ATNO);
2256                 scmd_printk(KERN_INFO, cmd, "Device is active, asserting ATN\n");
2257                 wait = TRUE;
2258         } else if (disconnected) {
2259
2260                 /*
2261                  * Actually re-queue this SCB in an attempt
2262                  * to select the device before it reconnects.
2263                  * In either case (selection or reselection),
2264                  * we will now issue the approprate message
2265                  * to the timed-out device.
2266                  *
2267                  * Set the MK_MESSAGE control bit indicating
2268                  * that we desire to send a message.  We
2269                  * also set the disconnected flag since
2270                  * in the paging case there is no guarantee
2271                  * that our SCB control byte matches the
2272                  * version on the card.  We don't want the
2273                  * sequencer to abort the command thinking
2274                  * an unsolicited reselection occurred.
2275                  */
2276                 pending_scb->hscb->control |= MK_MESSAGE|DISCONNECTED;
2277                 pending_scb->flags |= SCB_RECOVERY_SCB|flag;
2278
2279                 /*
2280                  * Remove any cached copy of this SCB in the
2281                  * disconnected list in preparation for the
2282                  * queuing of our abort SCB.  We use the
2283                  * same element in the SCB, SCB_NEXT, for
2284                  * both the qinfifo and the disconnected list.
2285                  */
2286                 ahc_search_disc_list(ahc, cmd->device->id,
2287                                      cmd->device->channel + 'A',
2288                                      cmd->device->lun, pending_scb->hscb->tag,
2289                                      /*stop_on_first*/TRUE,
2290                                      /*remove*/TRUE,
2291                                      /*save_state*/FALSE);
2292
2293                 /*
2294                  * In the non-paging case, the sequencer will
2295                  * never re-reference the in-core SCB.
2296                  * To make sure we are notified during
2297                  * reslection, set the MK_MESSAGE flag in
2298                  * the card's copy of the SCB.
2299                  */
2300                 if ((ahc->flags & AHC_PAGESCBS) == 0) {
2301                         ahc_outb(ahc, SCBPTR, pending_scb->hscb->tag);
2302                         ahc_outb(ahc, SCB_CONTROL,
2303                                  ahc_inb(ahc, SCB_CONTROL)|MK_MESSAGE);
2304                 }
2305
2306                 /*
2307                  * Clear out any entries in the QINFIFO first
2308                  * so we are the next SCB for this target
2309                  * to run.
2310                  */
2311                 ahc_search_qinfifo(ahc, cmd->device->id,
2312                                    cmd->device->channel + 'A',
2313                                    cmd->device->lun, SCB_LIST_NULL,
2314                                    ROLE_INITIATOR, CAM_REQUEUE_REQ,
2315                                    SEARCH_COMPLETE);
2316                 ahc_qinfifo_requeue_tail(ahc, pending_scb);
2317                 ahc_outb(ahc, SCBPTR, saved_scbptr);
2318                 ahc_print_path(ahc, pending_scb);
2319                 printf("Device is disconnected, re-queuing SCB\n");
2320                 wait = TRUE;
2321         } else {
2322                 scmd_printk(KERN_INFO, cmd, "Unable to deliver message\n");
2323                 retval = FAILED;
2324                 goto done;
2325         }
2326
2327 no_cmd:
2328         /*
2329          * Our assumption is that if we don't have the command, no
2330          * recovery action was required, so we return success.  Again,
2331          * the semantics of the mid-layer recovery engine are not
2332          * well defined, so this may change in time.
2333          */
2334         retval = SUCCESS;
2335 done:
2336         if (paused)
2337                 ahc_unpause(ahc);
2338         if (wait) {
2339                 DECLARE_COMPLETION(done);
2340
2341                 ahc->platform_data->eh_done = &done;
2342                 ahc_unlock(ahc, &flags);
2343
2344                 printf("Recovery code sleeping\n");
2345                 if (!wait_for_completion_timeout(&done, 5 * HZ)) {
2346                         ahc_lock(ahc, &flags);
2347                         ahc->platform_data->eh_done = NULL;
2348                         ahc_unlock(ahc, &flags);
2349
2350                         printf("Timer Expired\n");
2351                         retval = FAILED;
2352                 }
2353                 printf("Recovery code awake\n");
2354         } else
2355                 ahc_unlock(ahc, &flags);
2356         return (retval);
2357 }
2358
2359 void
2360 ahc_platform_dump_card_state(struct ahc_softc *ahc)
2361 {
2362 }
2363
2364 static void ahc_linux_set_width(struct scsi_target *starget, int width)
2365 {
2366         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2367         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2368         struct ahc_devinfo devinfo;
2369         unsigned long flags;
2370
2371         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2372                             starget->channel + 'A', ROLE_INITIATOR);
2373         ahc_lock(ahc, &flags);
2374         ahc_set_width(ahc, &devinfo, width, AHC_TRANS_GOAL, FALSE);
2375         ahc_unlock(ahc, &flags);
2376 }
2377
2378 static void ahc_linux_set_period(struct scsi_target *starget, int period)
2379 {
2380         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2381         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2382         struct ahc_tmode_tstate *tstate;
2383         struct ahc_initiator_tinfo *tinfo
2384                 = ahc_fetch_transinfo(ahc,
2385                                       starget->channel + 'A',
2386                                       shost->this_id, starget->id, &tstate);
2387         struct ahc_devinfo devinfo;
2388         unsigned int ppr_options = tinfo->goal.ppr_options;
2389         unsigned long flags;
2390         unsigned long offset = tinfo->goal.offset;
2391         struct ahc_syncrate *syncrate;
2392
2393         if (offset == 0)
2394                 offset = MAX_OFFSET;
2395
2396         if (period < 9)
2397                 period = 9;     /* 12.5ns is our minimum */
2398         if (period == 9)
2399                 ppr_options |= MSG_EXT_PPR_DT_REQ;
2400
2401         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2402                             starget->channel + 'A', ROLE_INITIATOR);
2403
2404         /* all PPR requests apart from QAS require wide transfers */
2405         if (ppr_options & ~MSG_EXT_PPR_QAS_REQ) {
2406                 if (spi_width(starget) == 0)
2407                         ppr_options &= MSG_EXT_PPR_QAS_REQ;
2408         }
2409
2410         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2411         ahc_lock(ahc, &flags);
2412         ahc_set_syncrate(ahc, &devinfo, syncrate, period, offset,
2413                          ppr_options, AHC_TRANS_GOAL, FALSE);
2414         ahc_unlock(ahc, &flags);
2415 }
2416
2417 static void ahc_linux_set_offset(struct scsi_target *starget, int offset)
2418 {
2419         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2420         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2421         struct ahc_tmode_tstate *tstate;
2422         struct ahc_initiator_tinfo *tinfo
2423                 = ahc_fetch_transinfo(ahc,
2424                                       starget->channel + 'A',
2425                                       shost->this_id, starget->id, &tstate);
2426         struct ahc_devinfo devinfo;
2427         unsigned int ppr_options = 0;
2428         unsigned int period = 0;
2429         unsigned long flags;
2430         struct ahc_syncrate *syncrate = NULL;
2431
2432         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2433                             starget->channel + 'A', ROLE_INITIATOR);
2434         if (offset != 0) {
2435                 syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2436                 period = tinfo->goal.period;
2437                 ppr_options = tinfo->goal.ppr_options;
2438         }
2439         ahc_lock(ahc, &flags);
2440         ahc_set_syncrate(ahc, &devinfo, syncrate, period, offset,
2441                          ppr_options, AHC_TRANS_GOAL, FALSE);
2442         ahc_unlock(ahc, &flags);
2443 }
2444
2445 static void ahc_linux_set_dt(struct scsi_target *starget, int dt)
2446 {
2447         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2448         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2449         struct ahc_tmode_tstate *tstate;
2450         struct ahc_initiator_tinfo *tinfo
2451                 = ahc_fetch_transinfo(ahc,
2452                                       starget->channel + 'A',
2453                                       shost->this_id, starget->id, &tstate);
2454         struct ahc_devinfo devinfo;
2455         unsigned int ppr_options = tinfo->goal.ppr_options
2456                 & ~MSG_EXT_PPR_DT_REQ;
2457         unsigned int period = tinfo->goal.period;
2458         unsigned int width = tinfo->goal.width;
2459         unsigned long flags;
2460         struct ahc_syncrate *syncrate;
2461
2462         if (dt) {
2463                 ppr_options |= MSG_EXT_PPR_DT_REQ;
2464                 if (!width)
2465                         ahc_linux_set_width(starget, 1);
2466         } else if (period == 9)
2467                 period = 10;    /* if resetting DT, period must be >= 25ns */
2468
2469         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2470                             starget->channel + 'A', ROLE_INITIATOR);
2471         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options,AHC_SYNCRATE_DT);
2472         ahc_lock(ahc, &flags);
2473         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2474                          ppr_options, AHC_TRANS_GOAL, FALSE);
2475         ahc_unlock(ahc, &flags);
2476 }
2477
2478 #if 0
2479 /* FIXME: This code claims to support IU and QAS.  However, the actual
2480  * sequencer code and aic7xxx_core have no support for these parameters and
2481  * will get into a bad state if they're negotiated.  Do not enable this
2482  * unless you know what you're doing */
2483 static void ahc_linux_set_qas(struct scsi_target *starget, int qas)
2484 {
2485         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2486         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2487         struct ahc_tmode_tstate *tstate;
2488         struct ahc_initiator_tinfo *tinfo
2489                 = ahc_fetch_transinfo(ahc,
2490                                       starget->channel + 'A',
2491                                       shost->this_id, starget->id, &tstate);
2492         struct ahc_devinfo devinfo;
2493         unsigned int ppr_options = tinfo->goal.ppr_options
2494                 & ~MSG_EXT_PPR_QAS_REQ;
2495         unsigned int period = tinfo->goal.period;
2496         unsigned long flags;
2497         struct ahc_syncrate *syncrate;
2498
2499         if (qas)
2500                 ppr_options |= MSG_EXT_PPR_QAS_REQ;
2501
2502         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2503                             starget->channel + 'A', ROLE_INITIATOR);
2504         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2505         ahc_lock(ahc, &flags);
2506         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2507                          ppr_options, AHC_TRANS_GOAL, FALSE);
2508         ahc_unlock(ahc, &flags);
2509 }
2510
2511 static void ahc_linux_set_iu(struct scsi_target *starget, int iu)
2512 {
2513         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2514         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2515         struct ahc_tmode_tstate *tstate;
2516         struct ahc_initiator_tinfo *tinfo
2517                 = ahc_fetch_transinfo(ahc,
2518                                       starget->channel + 'A',
2519                                       shost->this_id, starget->id, &tstate);
2520         struct ahc_devinfo devinfo;
2521         unsigned int ppr_options = tinfo->goal.ppr_options
2522                 & ~MSG_EXT_PPR_IU_REQ;
2523         unsigned int period = tinfo->goal.period;
2524         unsigned long flags;
2525         struct ahc_syncrate *syncrate;
2526
2527         if (iu)
2528                 ppr_options |= MSG_EXT_PPR_IU_REQ;
2529
2530         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2531                             starget->channel + 'A', ROLE_INITIATOR);
2532         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2533         ahc_lock(ahc, &flags);
2534         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2535                          ppr_options, AHC_TRANS_GOAL, FALSE);
2536         ahc_unlock(ahc, &flags);
2537 }
2538 #endif
2539
2540 static struct spi_function_template ahc_linux_transport_functions = {
2541         .set_offset     = ahc_linux_set_offset,
2542         .show_offset    = 1,
2543         .set_period     = ahc_linux_set_period,
2544         .show_period    = 1,
2545         .set_width      = ahc_linux_set_width,
2546         .show_width     = 1,
2547         .set_dt         = ahc_linux_set_dt,
2548         .show_dt        = 1,
2549 #if 0
2550         .set_iu         = ahc_linux_set_iu,
2551         .show_iu        = 1,
2552         .set_qas        = ahc_linux_set_qas,
2553         .show_qas       = 1,
2554 #endif
2555 };
2556
2557
2558
2559 static int __init
2560 ahc_linux_init(void)
2561 {
2562         /*
2563          * If we've been passed any parameters, process them now.
2564          */
2565         if (aic7xxx)
2566                 aic7xxx_setup(aic7xxx);
2567
2568         ahc_linux_transport_template =
2569                 spi_attach_transport(&ahc_linux_transport_functions);
2570         if (!ahc_linux_transport_template)
2571                 return -ENODEV;
2572
2573         scsi_transport_reserve_target(ahc_linux_transport_template,
2574                                       sizeof(struct ahc_linux_target));
2575         scsi_transport_reserve_device(ahc_linux_transport_template,
2576                                       sizeof(struct ahc_linux_device));
2577
2578         ahc_linux_pci_init();
2579         ahc_linux_eisa_init();
2580         return 0;
2581 }
2582
2583 static void
2584 ahc_linux_exit(void)
2585 {
2586         ahc_linux_pci_exit();
2587         ahc_linux_eisa_exit();
2588         spi_release_transport(ahc_linux_transport_template);
2589 }
2590
2591 module_init(ahc_linux_init);
2592 module_exit(ahc_linux_exit);