drivers/scsi/aic7xxx/aic7xxx_osm.c

   1 /*
   2  * Adaptec AIC7xxx device driver for Linux.
   3  *
   4  * $Id: //depot/aic7xxx/linux/drivers/scsi/aic7xxx/aic7xxx_osm.c#235 $
   5  *
   6  * Copyright (c) 1994 John Aycock
   7  *   The University of Calgary Department of Computer Science.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2, or (at your option)
  12  * any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; see the file COPYING.  If not, write to
  21  * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  22  *
  23  * Sources include the Adaptec 1740 driver (aha1740.c), the Ultrastor 24F
  24  * driver (ultrastor.c), various Linux kernel source, the Adaptec EISA
  25  * config file (!adp7771.cfg), the Adaptec AHA-2740A Series User's Guide,
  26  * the Linux Kernel Hacker's Guide, Writing a SCSI Device Driver for Linux,
  27  * the Adaptec 1542 driver (aha1542.c), the Adaptec EISA overlay file
  28  * (adp7770.ovl), the Adaptec AHA-2740 Series Technical Reference Manual,
  29  * the Adaptec AIC-7770 Data Book, the ANSI SCSI specification, the
  30  * ANSI SCSI-2 specification (draft 10c), ...
  31  *
  32  * --------------------------------------------------------------------------
  33  *
  34  *  Modifications by Daniel M. Eischen (deischen@iworks.InterWorks.org):
  35  *
  36  *  Substantially modified to include support for wide and twin bus
  37  *  adapters, DMAing of SCBs, tagged queueing, IRQ sharing, bug fixes,
  38  *  SCB paging, and other rework of the code.
  39  *
  40  * --------------------------------------------------------------------------
  41  * Copyright (c) 1994-2000 Justin T. Gibbs.
  42  * Copyright (c) 2000-2001 Adaptec Inc.
  43  * All rights reserved.
  44  *
  45  * Redistribution and use in source and binary forms, with or without
  46  * modification, are permitted provided that the following conditions
  47  * are met:
  48  * 1. Redistributions of source code must retain the above copyright
  49  *    notice, this list of conditions, and the following disclaimer,
  50  *    without modification.
  51  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  52  *    substantially similar to the "NO WARRANTY" disclaimer below
  53  *    ("Disclaimer") and any redistribution must be conditioned upon
  54  *    including a substantially similar Disclaimer requirement for further
  55  *    binary redistribution.
  56  * 3. Neither the names of the above-listed copyright holders nor the names
  57  *    of any contributors may be used to endorse or promote products derived
  58  *    from this software without specific prior written permission.
  59  *
  60  * Alternatively, this software may be distributed under the terms of the
  61  * GNU General Public License ("GPL") version 2 as published by the Free
  62  * Software Foundation.
  63  *
  64  * NO WARRANTY
  65  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  66  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  67  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  68  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  69  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  70  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  71  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  72  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  73  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  74  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  75  * POSSIBILITY OF SUCH DAMAGES.
  76  *
  77  *---------------------------------------------------------------------------
  78  *
  79  *  Thanks also go to (in alphabetical order) the following:
  80  *
  81  *    Rory Bolt     - Sequencer bug fixes
  82  *    Jay Estabrook - Initial DEC Alpha support
  83  *    Doug Ledford  - Much needed abort/reset bug fixes
  84  *    Kai Makisara  - DMAing of SCBs
  85  *
  86  *  A Boot time option was also added for not resetting the scsi bus.
  87  *
  88  *    Form:  aic7xxx=extended
  89  *           aic7xxx=no_reset
  90  *           aic7xxx=verbose
  91  *
  92  *  Daniel M. Eischen, deischen@iworks.InterWorks.org, 1/23/97
  93  *
  94  *  Id: aic7xxx.c,v 4.1 1997/06/12 08:23:42 deang Exp
  95  */
  96
  97 /*
  98  * Further driver modifications made by Doug Ledford <dledford@redhat.com>
  99  *
 100  * Copyright (c) 1997-1999 Doug Ledford
 101  *
 102  * These changes are released under the same licensing terms as the FreeBSD
 103  * driver written by Justin Gibbs.  Please see his Copyright notice above
 104  * for the exact terms and conditions covering my changes as well as the
 105  * warranty statement.
 106  *
 107  * Modifications made to the aic7xxx.c,v 4.1 driver from Dan Eischen include
 108  * but are not limited to:
 109  *
 110  *  1: Import of the latest FreeBSD sequencer code for this driver
 111  *  2: Modification of kernel code to accommodate different sequencer semantics
 112  *  3: Extensive changes throughout kernel portion of driver to improve
 113  *     abort/reset processing and error hanndling
 114  *  4: Other work contributed by various people on the Internet
 115  *  5: Changes to printk information and verbosity selection code
 116  *  6: General reliability related changes, especially in IRQ management
 117  *  7: Modifications to the default probe/attach order for supported cards
 118  *  8: SMP friendliness has been improved
 119  *
 120  */
 121
 122 #include "aic7xxx_osm.h"
 123 #include "aic7xxx_inline.h"
 124 #include <scsi/scsicam.h>
 125
 126 static struct scsi_transport_template *ahc_linux_transport_template = NULL;
 127
 128 #include <linux/init.h>         /* __setup */
 129 #include <linux/mm.h>           /* For fetching system memory size */
 130 #include <linux/blkdev.h>               /* For block_size() */
 131 #include <linux/delay.h>        /* For ssleep/msleep */
 132
 133
 134 /*
 135  * Set this to the delay in seconds after SCSI bus reset.
 136  * Note, we honor this only for the initial bus reset.
 137  * The scsi error recovery code performs its own bus settle
 138  * delay handling for error recovery actions.
 139  */
 140 #ifdef CONFIG_AIC7XXX_RESET_DELAY_MS
 141 #define AIC7XXX_RESET_DELAY CONFIG_AIC7XXX_RESET_DELAY_MS
 142 #else
 143 #define AIC7XXX_RESET_DELAY 5000
 144 #endif
 145
 146 /*
 147  * Control collection of SCSI transfer statistics for the /proc filesystem.
 148  *
 149  * NOTE: Do NOT enable this when running on kernels version 1.2.x and below.
 150  * NOTE: This does affect performance since it has to maintain statistics.
 151  */
 152 #ifdef CONFIG_AIC7XXX_PROC_STATS
 153 #define AIC7XXX_PROC_STATS
 154 #endif
 155
 156 /*
 157  * To change the default number of tagged transactions allowed per-device,
 158  * add a line to the lilo.conf file like:
 159  * append="aic7xxx=verbose,tag_info:{{32,32,32,32},{32,32,32,32}}"
 160  * which will result in the first four devices on the first two
 161  * controllers being set to a tagged queue depth of 32.
 162  *
 163  * The tag_commands is an array of 16 to allow for wide and twin adapters.
 164  * Twin adapters will use indexes 0-7 for channel 0, and indexes 8-15
 165  * for channel 1.
 166  */
 167 typedef struct {
 168         uint8_t tag_commands[16];       /* Allow for wide/twin adapters. */
 169 } adapter_tag_info_t;
 170
 171 /*
 172  * Modify this as you see fit for your system.
 173  *
 174  * 0                    tagged queuing disabled
 175  * 1 <= n <= 253        n == max tags ever dispatched.
 176  *
 177  * The driver will throttle the number of commands dispatched to a
 178  * device if it returns queue full.  For devices with a fixed maximum
 179  * queue depth, the driver will eventually determine this depth and
 180  * lock it in (a console message is printed to indicate that a lock
 181  * has occurred).  On some devices, queue full is returned for a temporary
 182  * resource shortage.  These devices will return queue full at varying
 183  * depths.  The driver will throttle back when the queue fulls occur and
 184  * attempt to slowly increase the depth over time as the device recovers
 185  * from the resource shortage.
 186  *
 187  * In this example, the first line will disable tagged queueing for all
 188  * the devices on the first probed aic7xxx adapter.
 189  *
 190  * The second line enables tagged queueing with 4 commands/LUN for IDs
 191  * (0, 2-11, 13-15), disables tagged queueing for ID 12, and tells the
 192  * driver to attempt to use up to 64 tags for ID 1.
 193  *
 194  * The third line is the same as the first line.
 195  *
 196  * The fourth line disables tagged queueing for devices 0 and 3.  It
 197  * enables tagged queueing for the other IDs, with 16 commands/LUN
 198  * for IDs 1 and 4, 127 commands/LUN for ID 8, and 4 commands/LUN for
 199  * IDs 2, 5-7, and 9-15.
 200  */
 201
 202 /*
 203  * NOTE: The below structure is for reference only, the actual structure
 204  *       to modify in order to change things is just below this comment block.
 205 adapter_tag_info_t aic7xxx_tag_info[] =
 206 {
 207         {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
 208         {{4, 64, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 0, 4, 4, 4}},
 209         {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
 210         {{0, 16, 4, 0, 16, 4, 4, 4, 127, 4, 4, 4, 4, 4, 4, 4}}
 211 };
 212 */
 213
 214 #ifdef CONFIG_AIC7XXX_CMDS_PER_DEVICE
 215 #define AIC7XXX_CMDS_PER_DEVICE CONFIG_AIC7XXX_CMDS_PER_DEVICE
 216 #else
 217 #define AIC7XXX_CMDS_PER_DEVICE AHC_MAX_QUEUE
 218 #endif
 219
 220 #define AIC7XXX_CONFIGED_TAG_COMMANDS {                                 \
 221         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 222         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 223         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 224         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 225         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 226         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 227         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 228         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE                \
 229 }
 230
 231 /*
 232  * By default, use the number of commands specified by
 233  * the users kernel configuration.
 234  */
 235 static adapter_tag_info_t aic7xxx_tag_info[] =
 236 {
 237         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 238         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 239         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 240         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 241         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 242         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 243         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 244         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 245         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 246         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 247         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 248         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 249         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 250         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 251         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 252         {AIC7XXX_CONFIGED_TAG_COMMANDS}
 253 };
 254
 255 /*
 256  * There should be a specific return value for this in scsi.h, but
 257  * it seems that most drivers ignore it.
 258  */
 259 #define DID_UNDERFLOW   DID_ERROR
 260
 261 void
 262 ahc_print_path(struct ahc_softc *ahc, struct scb *scb)
 263 {
 264         printk("(scsi%d:%c:%d:%d): ",
 265                ahc->platform_data->host->host_no,
 266                scb != NULL ? SCB_GET_CHANNEL(ahc, scb) : 'X',
 267                scb != NULL ? SCB_GET_TARGET(ahc, scb) : -1,
 268                scb != NULL ? SCB_GET_LUN(scb) : -1);
 269 }
 270
 271 /*
 272  * XXX - these options apply unilaterally to _all_ 274x/284x/294x
 273  *       cards in the system.  This should be fixed.  Exceptions to this
 274  *       rule are noted in the comments.
 275  */
 276
 277 /*
 278  * Skip the scsi bus reset.  Non 0 make us skip the reset at startup.  This
 279  * has no effect on any later resets that might occur due to things like
 280  * SCSI bus timeouts.
 281  */
 282 static uint32_t aic7xxx_no_reset;
 283
 284 /*
 285  * Should we force EXTENDED translation on a controller.
 286  *     0 == Use whatever is in the SEEPROM or default to off
 287  *     1 == Use whatever is in the SEEPROM or default to on
 288  */
 289 static uint32_t aic7xxx_extended;
 290
 291 /*
 292  * PCI bus parity checking of the Adaptec controllers.  This is somewhat
 293  * dubious at best.  To my knowledge, this option has never actually
 294  * solved a PCI parity problem, but on certain machines with broken PCI
 295  * chipset configurations where stray PCI transactions with bad parity are
 296  * the norm rather than the exception, the error messages can be overwelming.
 297  * It's included in the driver for completeness.
 298  *   0     = Shut off PCI parity check
 299  *   non-0 = reverse polarity pci parity checking
 300  */
 301 static uint32_t aic7xxx_pci_parity = ~0;
 302
 303 /*
 304  * There are lots of broken chipsets in the world.  Some of them will
 305  * violate the PCI spec when we issue byte sized memory writes to our
 306  * controller.  I/O mapped register access, if allowed by the given
 307  * platform, will work in almost all cases.
 308  */
 309 uint32_t aic7xxx_allow_memio = ~0;
 310
 311 /*
 312  * So that we can set how long each device is given as a selection timeout.
 313  * The table of values goes like this:
 314  *   0 - 256ms
 315  *   1 - 128ms
 316  *   2 - 64ms
 317  *   3 - 32ms
 318  * We default to 256ms because some older devices need a longer time
 319  * to respond to initial selection.
 320  */
 321 static uint32_t aic7xxx_seltime;
 322
 323 /*
 324  * Certain devices do not perform any aging on commands.  Should the
 325  * device be saturated by commands in one portion of the disk, it is
 326  * possible for transactions on far away sectors to never be serviced.
 327  * To handle these devices, we can periodically send an ordered tag to
 328  * force all outstanding transactions to be serviced prior to a new
 329  * transaction.
 330  */
 331 uint32_t aic7xxx_periodic_otag;
 332
 333 /*
 334  * Module information and settable options.
 335  */
 336 static char *aic7xxx = NULL;
 337
 338 MODULE_AUTHOR("Maintainer: Justin T. Gibbs <gibbs@scsiguy.com>");
 339 MODULE_DESCRIPTION("Adaptec Aic77XX/78XX SCSI Host Bus Adapter driver");
 340 MODULE_LICENSE("Dual BSD/GPL");
 341 MODULE_VERSION(AIC7XXX_DRIVER_VERSION);
 342 module_param(aic7xxx, charp, 0444);
 343 MODULE_PARM_DESC(aic7xxx,
 344 "period delimited, options string.\n"
 345 "       verbose                 Enable verbose/diagnostic logging\n"
 346 "       allow_memio             Allow device registers to be memory mapped\n"
 347 "       debug                   Bitmask of debug values to enable\n"
 348 "       no_probe                Toggle EISA/VLB controller probing\n"
 349 "       probe_eisa_vl           Toggle EISA/VLB controller probing\n"
 350 "       no_reset                Supress initial bus resets\n"
 351 "       extended                Enable extended geometry on all controllers\n"
 352 "       periodic_otag           Send an ordered tagged transaction\n"
 353 "                               periodically to prevent tag starvation.\n"
 354 "                               This may be required by some older disk\n"
 355 "                               drives or RAID arrays.\n"
 356 "       reverse_scan            Sort PCI devices highest Bus/Slot to lowest\n"
 357 "       tag_info:<tag_str>      Set per-target tag depth\n"
 358 "       global_tag_depth:<int>  Global tag depth for every target\n"
 359 "                               on every bus\n"
 360 "       seltime:<int>           Selection Timeout\n"
 361 "                               (0/256ms,1/128ms,2/64ms,3/32ms)\n"
 362 "\n"
 363 "       Sample /etc/modprobe.conf line:\n"
 364 "               Toggle EISA/VLB probing\n"
 365 "               Set tag depth on Controller 1/Target 1 to 10 tags\n"
 366 "               Shorten the selection timeout to 128ms\n"
 367 "\n"
 368 "       options aic7xxx 'aic7xxx=probe_eisa_vl.tag_info:{{}.{.10}}.seltime:1'\n"
 369 );
 370
 371 static void ahc_linux_handle_scsi_status(struct ahc_softc *,
 372                                          struct scsi_device *,
 373                                          struct scb *);
 374 static void ahc_linux_queue_cmd_complete(struct ahc_softc *ahc,
 375                                          struct scsi_cmnd *cmd);
 376 static void ahc_linux_sem_timeout(u_long arg);
 377 static void ahc_linux_freeze_simq(struct ahc_softc *ahc);
 378 static void ahc_linux_release_simq(u_long arg);
 379 static int  ahc_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag);
 380 static void ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc);
 381 static u_int ahc_linux_user_tagdepth(struct ahc_softc *ahc,
 382                                      struct ahc_devinfo *devinfo);
 383 static void ahc_linux_device_queue_depth(struct scsi_device *);
 384 static int ahc_linux_run_command(struct ahc_softc*,
 385                                  struct ahc_linux_device *,
 386                                  struct scsi_cmnd *);
 387 static void ahc_linux_setup_tag_info_global(char *p);
 388 static int  aic7xxx_setup(char *s);
 389
 390 static int ahc_linux_unit;
 391
 392
 393 /********************************* Inlines ************************************/
 394 static __inline void ahc_linux_unmap_scb(struct ahc_softc*, struct scb*);
 395
 396 static __inline int ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb,
 397                                       struct ahc_dma_seg *sg,
 398                                       dma_addr_t addr, bus_size_t len);
 399
 400 static __inline void
 401 ahc_linux_unmap_scb(struct ahc_softc *ahc, struct scb *scb)
 402 {
 403         struct scsi_cmnd *cmd;
 404
 405         cmd = scb->io_ctx;
 406         ahc_sync_sglist(ahc, scb, BUS_DMASYNC_POSTWRITE);
 407         if (cmd->use_sg != 0) {
 408                 struct scatterlist *sg;
 409
 410                 sg = (struct scatterlist *)cmd->request_buffer;
 411                 pci_unmap_sg(ahc->dev_softc, sg, cmd->use_sg,
 412                              cmd->sc_data_direction);
 413         } else if (cmd->request_bufflen != 0) {
 414                 pci_unmap_single(ahc->dev_softc,
 415                                  scb->platform_data->buf_busaddr,
 416                                  cmd->request_bufflen,
 417                                  cmd->sc_data_direction);
 418         }
 419 }
 420
 421 static __inline int
 422 ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb,
 423                   struct ahc_dma_seg *sg, dma_addr_t addr, bus_size_t len)
 424 {
 425         int      consumed;
 426
 427         if ((scb->sg_count + 1) > AHC_NSEG)
 428                 panic("Too few segs for dma mapping.  "
 429                       "Increase AHC_NSEG\n");
 430
 431         consumed = 1;
 432         sg->addr = ahc_htole32(addr & 0xFFFFFFFF);
 433         scb->platform_data->xfer_len += len;
 434
 435         if (sizeof(dma_addr_t) > 4
 436          && (ahc->flags & AHC_39BIT_ADDRESSING) != 0)
 437                 len |= (addr >> 8) & AHC_SG_HIGH_ADDR_MASK;
 438
 439         sg->len = ahc_htole32(len);
 440         return (consumed);
 441 }
 442
 443 /*
 444  * Return a string describing the driver.
 445  */
 446 static const char *
 447 ahc_linux_info(struct Scsi_Host *host)
 448 {
 449         static char buffer[512];
 450         char    ahc_info[256];
 451         char   *bp;
 452         struct ahc_softc *ahc;
 453
 454         bp = &buffer[0];
 455         ahc = *(struct ahc_softc **)host->hostdata;
 456         memset(bp, 0, sizeof(buffer));
 457         strcpy(bp, "Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev ");
 458         strcat(bp, AIC7XXX_DRIVER_VERSION);
 459         strcat(bp, "\n");
 460         strcat(bp, "        <");
 461         strcat(bp, ahc->description);
 462         strcat(bp, ">\n");
 463         strcat(bp, "        ");
 464         ahc_controller_info(ahc, ahc_info);
 465         strcat(bp, ahc_info);
 466         strcat(bp, "\n");
 467
 468         return (bp);
 469 }
 470
 471 /*
 472  * Queue an SCB to the controller.
 473  */
 474 static int
 475 ahc_linux_queue(struct scsi_cmnd * cmd, void (*scsi_done) (struct scsi_cmnd *))
 476 {
 477         struct   ahc_softc *ahc;
 478         struct   ahc_linux_device *dev = scsi_transport_device_data(cmd->device);
 479         int rtn = SCSI_MLQUEUE_HOST_BUSY;
 480         unsigned long flags;
 481
 482         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
 483
 484         ahc_lock(ahc, &flags);
 485         if (ahc->platform_data->qfrozen == 0) {
 486                 cmd->scsi_done = scsi_done;
 487                 cmd->result = CAM_REQ_INPROG << 16;
 488                 rtn = ahc_linux_run_command(ahc, dev, cmd);
 489         }
 490         ahc_unlock(ahc, &flags);
 491
 492         return rtn;
 493 }
 494
 495 static inline struct scsi_target **
 496 ahc_linux_target_in_softc(struct scsi_target *starget)
 497 {
 498         struct  ahc_softc *ahc =
 499                 *((struct ahc_softc **)dev_to_shost(&starget->dev)->hostdata);
 500         unsigned int target_offset;
 501
 502         target_offset = starget->id;
 503         if (starget->channel != 0)
 504                 target_offset += 8;
 505
 506         return &ahc->platform_data->starget[target_offset];
 507 }
 508
 509 static int
 510 ahc_linux_target_alloc(struct scsi_target *starget)
 511 {
 512         struct  ahc_softc *ahc =
 513                 *((struct ahc_softc **)dev_to_shost(&starget->dev)->hostdata);
 514         struct seeprom_config *sc = ahc->seep_config;
 515         unsigned long flags;
 516         struct scsi_target **ahc_targp = ahc_linux_target_in_softc(starget);
 517         struct ahc_linux_target *targ = scsi_transport_target_data(starget);
 518         unsigned short scsirate;
 519         struct ahc_devinfo devinfo;
 520         struct ahc_initiator_tinfo *tinfo;
 521         struct ahc_tmode_tstate *tstate;
 522         char channel = starget->channel + 'A';
 523         unsigned int our_id = ahc->our_id;
 524         unsigned int target_offset;
 525
 526         target_offset = starget->id;
 527         if (starget->channel != 0)
 528                 target_offset += 8;
 529
 530         if (starget->channel)
 531                 our_id = ahc->our_id_b;
 532
 533         ahc_lock(ahc, &flags);
 534
 535         BUG_ON(*ahc_targp != NULL);
 536
 537         *ahc_targp = starget;
 538         memset(targ, 0, sizeof(*targ));
 539
 540         if (sc) {
 541                 int maxsync = AHC_SYNCRATE_DT;
 542                 int ultra = 0;
 543                 int flags = sc->device_flags[target_offset];
 544
 545                 if (ahc->flags & AHC_NEWEEPROM_FMT) {
 546                     if (flags & CFSYNCHISULTRA)
 547                         ultra = 1;
 548                 } else if (flags & CFULTRAEN)
 549                         ultra = 1;
 550                 /* AIC nutcase; 10MHz appears as ultra = 1, CFXFER = 0x04
 551                  * change it to ultra=0, CFXFER = 0 */
 552                 if(ultra && (flags & CFXFER) == 0x04) {
 553                         ultra = 0;
 554                         flags &= ~CFXFER;
 555                 }
 556
 557                 if ((ahc->features & AHC_ULTRA2) != 0) {
 558                         scsirate = (flags & CFXFER) | (ultra ? 0x8 : 0);
 559                 } else {
 560                         scsirate = (flags & CFXFER) << 4;
 561                         maxsync = ultra ? AHC_SYNCRATE_ULTRA :
 562                                 AHC_SYNCRATE_FAST;
 563                 }
 564                 spi_max_width(starget) = (flags & CFWIDEB) ? 1 : 0;
 565                 if (!(flags & CFSYNCH))
 566                         spi_max_offset(starget) = 0;
 567                 spi_min_period(starget) =
 568                         ahc_find_period(ahc, scsirate, maxsync);
 569
 570                 tinfo = ahc_fetch_transinfo(ahc, channel, ahc->our_id,
 571                                             starget->id, &tstate);
 572         }
 573         ahc_compile_devinfo(&devinfo, our_id, starget->id,
 574                             CAM_LUN_WILDCARD, channel,
 575                             ROLE_INITIATOR);
 576         ahc_set_syncrate(ahc, &devinfo, NULL, 0, 0, 0,
 577                          AHC_TRANS_GOAL, /*paused*/FALSE);
 578         ahc_set_width(ahc, &devinfo, MSG_EXT_WDTR_BUS_8_BIT,
 579                       AHC_TRANS_GOAL, /*paused*/FALSE);
 580         ahc_unlock(ahc, &flags);
 581
 582         return 0;
 583 }
 584
 585 static void
 586 ahc_linux_target_destroy(struct scsi_target *starget)
 587 {
 588         struct scsi_target **ahc_targp = ahc_linux_target_in_softc(starget);
 589
 590         *ahc_targp = NULL;
 591 }
 592
 593 static int
 594 ahc_linux_slave_alloc(struct scsi_device *sdev)
 595 {
 596         struct  ahc_softc *ahc =
 597                 *((struct ahc_softc **)sdev->host->hostdata);
 598         struct scsi_target *starget = sdev->sdev_target;
 599         struct ahc_linux_target *targ = scsi_transport_target_data(starget);
 600         struct ahc_linux_device *dev;
 601
 602         if (bootverbose)
 603                 printf("%s: Slave Alloc %d\n", ahc_name(ahc), sdev->id);
 604
 605         BUG_ON(targ->sdev[sdev->lun] != NULL);
 606
 607         dev = scsi_transport_device_data(sdev);
 608         memset(dev, 0, sizeof(*dev));
 609
 610         /*
 611          * We start out life using untagged
 612          * transactions of which we allow one.
 613          */
 614         dev->openings = 1;
 615
 616         /*
 617          * Set maxtags to 0.  This will be changed if we
 618          * later determine that we are dealing with
 619          * a tagged queuing capable device.
 620          */
 621         dev->maxtags = 0;
 622
 623         targ->sdev[sdev->lun] = sdev;
 624
 625         spi_period(starget) = 0;
 626
 627         return 0;
 628 }
 629
 630 static int
 631 ahc_linux_slave_configure(struct scsi_device *sdev)
 632 {
 633         struct  ahc_softc *ahc;
 634
 635         ahc = *((struct ahc_softc **)sdev->host->hostdata);
 636
 637         if (bootverbose)
 638                 sdev_printk(KERN_INFO, sdev, "Slave Configure\n");
 639
 640         ahc_linux_device_queue_depth(sdev);
 641
 642         /* Initial Domain Validation */
 643         if (!spi_initial_dv(sdev->sdev_target))
 644                 spi_dv_device(sdev);
 645
 646         return 0;
 647 }
 648
 649 static void
 650 ahc_linux_slave_destroy(struct scsi_device *sdev)
 651 {
 652         struct  ahc_softc *ahc;
 653         struct  ahc_linux_device *dev = scsi_transport_device_data(sdev);
 654         struct  ahc_linux_target *targ = scsi_transport_target_data(sdev->sdev_target);
 655
 656         ahc = *((struct ahc_softc **)sdev->host->hostdata);
 657         if (bootverbose)
 658                 printf("%s: Slave Destroy %d\n", ahc_name(ahc), sdev->id);
 659
 660         BUG_ON(dev->active);
 661
 662         targ->sdev[sdev->lun] = NULL;
 663 }
 664
 665 #if defined(__i386__)
 666 /*
 667  * Return the disk geometry for the given SCSI device.
 668  */
 669 static int
 670 ahc_linux_biosparam(struct scsi_device *sdev, struct block_device *bdev,
 671                     sector_t capacity, int geom[])
 672 {
 673         uint8_t *bh;
 674         int      heads;
 675         int      sectors;
 676         int      cylinders;
 677         int      ret;
 678         int      extended;
 679         struct   ahc_softc *ahc;
 680         u_int    channel;
 681
 682         ahc = *((struct ahc_softc **)sdev->host->hostdata);
 683         channel = sdev_channel(sdev);
 684
 685         bh = scsi_bios_ptable(bdev);
 686         if (bh) {
 687                 ret = scsi_partsize(bh, capacity,
 688                                     &geom[2], &geom[0], &geom[1]);
 689                 kfree(bh);
 690                 if (ret != -1)
 691                         return (ret);
 692         }
 693         heads = 64;
 694         sectors = 32;
 695         cylinders = aic_sector_div(capacity, heads, sectors);
 696
 697         if (aic7xxx_extended != 0)
 698                 extended = 1;
 699         else if (channel == 0)
 700                 extended = (ahc->flags & AHC_EXTENDED_TRANS_A) != 0;
 701         else
 702                 extended = (ahc->flags & AHC_EXTENDED_TRANS_B) != 0;
 703         if (extended && cylinders >= 1024) {
 704                 heads = 255;
 705                 sectors = 63;
 706                 cylinders = aic_sector_div(capacity, heads, sectors);
 707         }
 708         geom[0] = heads;
 709         geom[1] = sectors;
 710         geom[2] = cylinders;
 711         return (0);
 712 }
 713 #endif
 714
 715 /*
 716  * Abort the current SCSI command(s).
 717  */
 718 static int
 719 ahc_linux_abort(struct scsi_cmnd *cmd)
 720 {
 721         int error;
 722
 723         error = ahc_linux_queue_recovery_cmd(cmd, SCB_ABORT);
 724         if (error != 0)
 725                 printf("aic7xxx_abort returns 0x%x\n", error);
 726         return (error);
 727 }
 728
 729 /*
 730  * Attempt to send a target reset message to the device that timed out.
 731  */
 732 static int
 733 ahc_linux_dev_reset(struct scsi_cmnd *cmd)
 734 {
 735         int error;
 736
 737         error = ahc_linux_queue_recovery_cmd(cmd, SCB_DEVICE_RESET);
 738         if (error != 0)
 739                 printf("aic7xxx_dev_reset returns 0x%x\n", error);
 740         return (error);
 741 }
 742
 743 /*
 744  * Reset the SCSI bus.
 745  */
 746 static int
 747 ahc_linux_bus_reset(struct scsi_cmnd *cmd)
 748 {
 749         struct ahc_softc *ahc;
 750         int    found;
 751         unsigned long flags;
 752
 753         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
 754
 755         ahc_lock(ahc, &flags);
 756         found = ahc_reset_channel(ahc, scmd_channel(cmd) + 'A',
 757                                   /*initiate reset*/TRUE);
 758         ahc_unlock(ahc, &flags);
 759
 760         if (bootverbose)
 761                 printf("%s: SCSI bus reset delivered. "
 762                        "%d SCBs aborted.\n", ahc_name(ahc), found);
 763
 764         return SUCCESS;
 765 }
 766
 767 struct scsi_host_template aic7xxx_driver_template = {
 768         .module                 = THIS_MODULE,
 769         .name                   = "aic7xxx",
 770         .proc_name              = "aic7xxx",
 771         .proc_info              = ahc_linux_proc_info,
 772         .info                   = ahc_linux_info,
 773         .queuecommand           = ahc_linux_queue,
 774         .eh_abort_handler       = ahc_linux_abort,
 775         .eh_device_reset_handler = ahc_linux_dev_reset,
 776         .eh_bus_reset_handler   = ahc_linux_bus_reset,
 777 #if defined(__i386__)
 778         .bios_param             = ahc_linux_biosparam,
 779 #endif
 780         .can_queue              = AHC_MAX_QUEUE,
 781         .this_id                = -1,
 782         .cmd_per_lun            = 2,
 783         .use_clustering         = ENABLE_CLUSTERING,
 784         .slave_alloc            = ahc_linux_slave_alloc,
 785         .slave_configure        = ahc_linux_slave_configure,
 786         .slave_destroy          = ahc_linux_slave_destroy,
 787         .target_alloc           = ahc_linux_target_alloc,
 788         .target_destroy         = ahc_linux_target_destroy,
 789 };
 790
 791 /**************************** Tasklet Handler *********************************/
 792
 793 /******************************** Macros **************************************/
 794 #define BUILD_SCSIID(ahc, cmd)                                              \
 795         ((((cmd)->device->id << TID_SHIFT) & TID)                           \
 796         | (((cmd)->device->channel == 0) ? (ahc)->our_id : (ahc)->our_id_b) \
 797         | (((cmd)->device->channel == 0) ? 0 : TWIN_CHNLB))
 798
 799 /******************************** Bus DMA *************************************/
 800 int
 801 ahc_dma_tag_create(struct ahc_softc *ahc, bus_dma_tag_t parent,
 802                    bus_size_t alignment, bus_size_t boundary,
 803                    dma_addr_t lowaddr, dma_addr_t highaddr,
 804                    bus_dma_filter_t *filter, void *filterarg,
 805                    bus_size_t maxsize, int nsegments,
 806                    bus_size_t maxsegsz, int flags, bus_dma_tag_t *ret_tag)
 807 {
 808         bus_dma_tag_t dmat;
 809
 810         dmat = malloc(sizeof(*dmat), M_DEVBUF, M_NOWAIT);
 811         if (dmat == NULL)
 812                 return (ENOMEM);
 813
 814         /*
 815          * Linux is very simplistic about DMA memory.  For now don't
 816          * maintain all specification information.  Once Linux supplies
 817          * better facilities for doing these operations, or the
 818          * needs of this particular driver change, we might need to do
 819          * more here.
 820          */
 821         dmat->alignment = alignment;
 822         dmat->boundary = boundary;
 823         dmat->maxsize = maxsize;
 824         *ret_tag = dmat;
 825         return (0);
 826 }
 827
 828 void
 829 ahc_dma_tag_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat)
 830 {
 831         free(dmat, M_DEVBUF);
 832 }
 833
 834 int
 835 ahc_dmamem_alloc(struct ahc_softc *ahc, bus_dma_tag_t dmat, void** vaddr,
 836                  int flags, bus_dmamap_t *mapp)
 837 {
 838         *vaddr = pci_alloc_consistent(ahc->dev_softc,
 839                                       dmat->maxsize, mapp);
 840         if (*vaddr == NULL)
 841                 return ENOMEM;
 842         return 0;
 843 }
 844
 845 void
 846 ahc_dmamem_free(struct ahc_softc *ahc, bus_dma_tag_t dmat,
 847                 void* vaddr, bus_dmamap_t map)
 848 {
 849         pci_free_consistent(ahc->dev_softc, dmat->maxsize,
 850                             vaddr, map);
 851 }
 852
 853 int
 854 ahc_dmamap_load(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map,
 855                 void *buf, bus_size_t buflen, bus_dmamap_callback_t *cb,
 856                 void *cb_arg, int flags)
 857 {
 858         /*
 859          * Assume for now that this will only be used during
 860          * initialization and not for per-transaction buffer mapping.
 861          */
 862         bus_dma_segment_t stack_sg;
 863
 864         stack_sg.ds_addr = map;
 865         stack_sg.ds_len = dmat->maxsize;
 866         cb(cb_arg, &stack_sg, /*nseg*/1, /*error*/0);
 867         return (0);
 868 }
 869
 870 void
 871 ahc_dmamap_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
 872 {
 873 }
 874
 875 int
 876 ahc_dmamap_unload(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
 877 {
 878         /* Nothing to do */
 879         return (0);
 880 }
 881
 882 static void
 883 ahc_linux_setup_tag_info_global(char *p)
 884 {
 885         int tags, i, j;
 886
 887         tags = simple_strtoul(p + 1, NULL, 0) & 0xff;
 888         printf("Setting Global Tags= %d\n", tags);
 889
 890         for (i = 0; i < NUM_ELEMENTS(aic7xxx_tag_info); i++) {
 891                 for (j = 0; j < AHC_NUM_TARGETS; j++) {
 892                         aic7xxx_tag_info[i].tag_commands[j] = tags;
 893                 }
 894         }
 895 }
 896
 897 static void
 898 ahc_linux_setup_tag_info(u_long arg, int instance, int targ, int32_t value)
 899 {
 900
 901         if ((instance >= 0) && (targ >= 0)
 902          && (instance < NUM_ELEMENTS(aic7xxx_tag_info))
 903          && (targ < AHC_NUM_TARGETS)) {
 904                 aic7xxx_tag_info[instance].tag_commands[targ] = value & 0xff;
 905                 if (bootverbose)
 906                         printf("tag_info[%d:%d] = %d\n", instance, targ, value);
 907         }
 908 }
 909
 910 static char *
 911 ahc_parse_brace_option(char *opt_name, char *opt_arg, char *end, int depth,
 912                        void (*callback)(u_long, int, int, int32_t),
 913                        u_long callback_arg)
 914 {
 915         char    *tok_end;
 916         char    *tok_end2;
 917         int      i;
 918         int      instance;
 919         int      targ;
 920         int      done;
 921         char     tok_list[] = {'.', ',', '{', '}', '\0'};
 922
 923         /* All options use a ':' name/arg separator */
 924         if (*opt_arg != ':')
 925                 return (opt_arg);
 926         opt_arg++;
 927         instance = -1;
 928         targ = -1;
 929         done = FALSE;
 930         /*
 931          * Restore separator that may be in
 932          * the middle of our option argument.
 933          */
 934         tok_end = strchr(opt_arg, '\0');
 935         if (tok_end < end)
 936                 *tok_end = ',';
 937         while (!done) {
 938                 switch (*opt_arg) {
 939                 case '{':
 940                         if (instance == -1) {
 941                                 instance = 0;
 942                         } else {
 943                                 if (depth > 1) {
 944                                         if (targ == -1)
 945                                                 targ = 0;
 946                                 } else {
 947                                         printf("Malformed Option %s\n",
 948                                                opt_name);
 949                                         done = TRUE;
 950                                 }
 951                         }
 952                         opt_arg++;
 953                         break;
 954                 case '}':
 955                         if (targ != -1)
 956                                 targ = -1;
 957                         else if (instance != -1)
 958                                 instance = -1;
 959                         opt_arg++;
 960                         break;
 961                 case ',':
 962                 case '.':
 963                         if (instance == -1)
 964                                 done = TRUE;
 965                         else if (targ >= 0)
 966                                 targ++;
 967                         else if (instance >= 0)
 968                                 instance++;
 969                         opt_arg++;
 970                         break;
 971                 case '\0':
 972                         done = TRUE;
 973                         break;
 974                 default:
 975                         tok_end = end;
 976                         for (i = 0; tok_list[i]; i++) {
 977                                 tok_end2 = strchr(opt_arg, tok_list[i]);
 978                                 if ((tok_end2) && (tok_end2 < tok_end))
 979                                         tok_end = tok_end2;
 980                         }
 981                         callback(callback_arg, instance, targ,
 982                                  simple_strtol(opt_arg, NULL, 0));
 983                         opt_arg = tok_end;
 984                         break;
 985                 }
 986         }
 987         return (opt_arg);
 988 }
 989
 990 /*
 991  * Handle Linux boot parameters. This routine allows for assigning a value
 992  * to a parameter with a ':' between the parameter and the value.
 993  * ie. aic7xxx=stpwlev:1,extended
 994  */
 995 static int
 996 aic7xxx_setup(char *s)
 997 {
 998         int     i, n;
 999         char   *p;
1000         char   *end;
1001
1002         static struct {
1003                 const char *name;
1004                 uint32_t *flag;
1005         } options[] = {
1006                 { "extended", &aic7xxx_extended },
1007                 { "no_reset", &aic7xxx_no_reset },
1008                 { "verbose", &aic7xxx_verbose },
1009                 { "allow_memio", &aic7xxx_allow_memio},
1010 #ifdef AHC_DEBUG
1011                 { "debug", &ahc_debug },
1012 #endif
1013                 { "periodic_otag", &aic7xxx_periodic_otag },
1014                 { "pci_parity", &aic7xxx_pci_parity },
1015                 { "seltime", &aic7xxx_seltime },
1016                 { "tag_info", NULL },
1017                 { "global_tag_depth", NULL },
1018                 { "dv", NULL }
1019         };
1020
1021         end = strchr(s, '\0');
1022
1023         /*
1024          * XXX ia64 gcc isn't smart enough to know that NUM_ELEMENTS
1025          * will never be 0 in this case.
1026          */
1027         n = 0;
1028
1029         while ((p = strsep(&s, ",.")) != NULL) {
1030                 if (*p == '\0')
1031                         continue;
1032                 for (i = 0; i < NUM_ELEMENTS(options); i++) {
1033
1034                         n = strlen(options[i].name);
1035                         if (strncmp(options[i].name, p, n) == 0)
1036                                 break;
1037                 }
1038                 if (i == NUM_ELEMENTS(options))
1039                         continue;
1040
1041                 if (strncmp(p, "global_tag_depth", n) == 0) {
1042                         ahc_linux_setup_tag_info_global(p + n);
1043                 } else if (strncmp(p, "tag_info", n) == 0) {
1044                         s = ahc_parse_brace_option("tag_info", p + n, end,
1045                             2, ahc_linux_setup_tag_info, 0);
1046                 } else if (p[n] == ':') {
1047                         *(options[i].flag) = simple_strtoul(p + n + 1, NULL, 0);
1048                 } else if (strncmp(p, "verbose", n) == 0) {
1049                         *(options[i].flag) = 1;
1050                 } else {
1051                         *(options[i].flag) ^= 0xFFFFFFFF;
1052                 }
1053         }
1054         return 1;
1055 }
1056
1057 __setup("aic7xxx=", aic7xxx_setup);
1058
1059 uint32_t aic7xxx_verbose;
1060
1061 int
1062 ahc_linux_register_host(struct ahc_softc *ahc, struct scsi_host_template *template)
1063 {
1064         char     buf[80];
1065         struct   Scsi_Host *host;
1066         char    *new_name;
1067         u_long   s;
1068
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_lock(ahc, &s);
1076         ahc->platform_data->host = host;
1077         host->can_queue = AHC_MAX_QUEUE;
1078         host->cmd_per_lun = 2;
1079         /* XXX No way to communicate the ID for multiple channels */
1080         host->this_id = ahc->our_id;
1081         host->irq = ahc->platform_data->irq;
1082         host->max_id = (ahc->features & AHC_WIDE) ? 16 : 8;
1083         host->max_lun = AHC_NUM_LUNS;
1084         host->max_channel = (ahc->features & AHC_TWIN) ? 1 : 0;
1085         host->sg_tablesize = AHC_NSEG;
1086         ahc_set_unit(ahc, ahc_linux_unit++);
1087         sprintf(buf, "scsi%d", host->host_no);
1088         new_name = malloc(strlen(buf) + 1, M_DEVBUF, M_NOWAIT);
1089         if (new_name != NULL) {
1090                 strcpy(new_name, buf);
1091                 ahc_set_name(ahc, new_name);
1092         }
1093         host->unique_id = ahc->unit;
1094         ahc_linux_initialize_scsi_bus(ahc);
1095         ahc_intr_enable(ahc, TRUE);
1096         ahc_unlock(ahc, &s);
1097
1098         host->transportt = ahc_linux_transport_template;
1099
1100         scsi_add_host(host, (ahc->dev_softc ? &ahc->dev_softc->dev : NULL)); /* XXX handle failure */
1101         scsi_scan_host(host);
1102         return (0);
1103 }
1104
1105 /*
1106  * Place the SCSI bus into a known state by either resetting it,
1107  * or forcing transfer negotiations on the next command to any
1108  * target.
1109  */
1110 void
1111 ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc)
1112 {
1113         int i;
1114         int numtarg;
1115
1116         i = 0;
1117         numtarg = 0;
1118
1119         if (aic7xxx_no_reset != 0)
1120                 ahc->flags &= ~(AHC_RESET_BUS_A|AHC_RESET_BUS_B);
1121
1122         if ((ahc->flags & AHC_RESET_BUS_A) != 0)
1123                 ahc_reset_channel(ahc, 'A', /*initiate_reset*/TRUE);
1124         else
1125                 numtarg = (ahc->features & AHC_WIDE) ? 16 : 8;
1126
1127         if ((ahc->features & AHC_TWIN) != 0) {
1128
1129                 if ((ahc->flags & AHC_RESET_BUS_B) != 0) {
1130                         ahc_reset_channel(ahc, 'B', /*initiate_reset*/TRUE);
1131                 } else {
1132                         if (numtarg == 0)
1133                                 i = 8;
1134                         numtarg += 8;
1135                 }
1136         }
1137
1138         /*
1139          * Force negotiation to async for all targets that
1140          * will not see an initial bus reset.
1141          */
1142         for (; i < numtarg; i++) {
1143                 struct ahc_devinfo devinfo;
1144                 struct ahc_initiator_tinfo *tinfo;
1145                 struct ahc_tmode_tstate *tstate;
1146                 u_int our_id;
1147                 u_int target_id;
1148                 char channel;
1149
1150                 channel = 'A';
1151                 our_id = ahc->our_id;
1152                 target_id = i;
1153                 if (i > 7 && (ahc->features & AHC_TWIN) != 0) {
1154                         channel = 'B';
1155                         our_id = ahc->our_id_b;
1156                         target_id = i % 8;
1157                 }
1158                 tinfo = ahc_fetch_transinfo(ahc, channel, our_id,
1159                                             target_id, &tstate);
1160                 ahc_compile_devinfo(&devinfo, our_id, target_id,
1161                                     CAM_LUN_WILDCARD, channel, ROLE_INITIATOR);
1162                 ahc_update_neg_request(ahc, &devinfo, tstate,
1163                                        tinfo, AHC_NEG_ALWAYS);
1164         }
1165         /* Give the bus some time to recover */
1166         if ((ahc->flags & (AHC_RESET_BUS_A|AHC_RESET_BUS_B)) != 0) {
1167                 ahc_linux_freeze_simq(ahc);
1168                 init_timer(&ahc->platform_data->reset_timer);
1169                 ahc->platform_data->reset_timer.data = (u_long)ahc;
1170                 ahc->platform_data->reset_timer.expires =
1171                     jiffies + (AIC7XXX_RESET_DELAY * HZ)/1000;
1172                 ahc->platform_data->reset_timer.function =
1173                     ahc_linux_release_simq;
1174                 add_timer(&ahc->platform_data->reset_timer);
1175         }
1176 }
1177
1178 int
1179 ahc_platform_alloc(struct ahc_softc *ahc, void *platform_arg)
1180 {
1181
1182         ahc->platform_data =
1183             malloc(sizeof(struct ahc_platform_data), M_DEVBUF, M_NOWAIT);
1184         if (ahc->platform_data == NULL)
1185                 return (ENOMEM);
1186         memset(ahc->platform_data, 0, sizeof(struct ahc_platform_data));
1187         ahc->platform_data->irq = AHC_LINUX_NOIRQ;
1188         ahc_lockinit(ahc);
1189         init_MUTEX_LOCKED(&ahc->platform_data->eh_sem);
1190         ahc->seltime = (aic7xxx_seltime & 0x3) << 4;
1191         ahc->seltime_b = (aic7xxx_seltime & 0x3) << 4;
1192         if (aic7xxx_pci_parity == 0)
1193                 ahc->flags |= AHC_DISABLE_PCI_PERR;
1194
1195         return (0);
1196 }
1197
1198 void
1199 ahc_platform_free(struct ahc_softc *ahc)
1200 {
1201         struct scsi_target *starget;
1202         int i, j;
1203
1204         if (ahc->platform_data != NULL) {
1205                 /* destroy all of the device and target objects */
1206                 for (i = 0; i < AHC_NUM_TARGETS; i++) {
1207                         starget = ahc->platform_data->starget[i];
1208                         if (starget != NULL) {
1209                                 for (j = 0; j < AHC_NUM_LUNS; j++) {
1210                                         struct ahc_linux_target *targ =
1211                                                 scsi_transport_target_data(starget);
1212
1213                                         if (targ->sdev[j] == NULL)
1214                                                 continue;
1215                                         targ->sdev[j] = NULL;
1216                                 }
1217                                 ahc->platform_data->starget[i] = NULL;
1218                         }
1219                 }
1220
1221                 if (ahc->platform_data->irq != AHC_LINUX_NOIRQ)
1222                         free_irq(ahc->platform_data->irq, ahc);
1223                 if (ahc->tag == BUS_SPACE_PIO
1224                  && ahc->bsh.ioport != 0)
1225                         release_region(ahc->bsh.ioport, 256);
1226                 if (ahc->tag == BUS_SPACE_MEMIO
1227                  && ahc->bsh.maddr != NULL) {
1228                         iounmap(ahc->bsh.maddr);
1229                         release_mem_region(ahc->platform_data->mem_busaddr,
1230                                            0x1000);
1231                 }
1232
1233                 if (ahc->platform_data->host)
1234                         scsi_host_put(ahc->platform_data->host);
1235
1236                 free(ahc->platform_data, M_DEVBUF);
1237         }
1238 }
1239
1240 void
1241 ahc_platform_freeze_devq(struct ahc_softc *ahc, struct scb *scb)
1242 {
1243         ahc_platform_abort_scbs(ahc, SCB_GET_TARGET(ahc, scb),
1244                                 SCB_GET_CHANNEL(ahc, scb),
1245                                 SCB_GET_LUN(scb), SCB_LIST_NULL,
1246                                 ROLE_UNKNOWN, CAM_REQUEUE_REQ);
1247 }
1248
1249 void
1250 ahc_platform_set_tags(struct ahc_softc *ahc, struct ahc_devinfo *devinfo,
1251                       ahc_queue_alg alg)
1252 {
1253         struct scsi_target *starget;
1254         struct ahc_linux_target *targ;
1255         struct ahc_linux_device *dev;
1256         struct scsi_device *sdev;
1257         u_int target_offset;
1258         int was_queuing;
1259         int now_queuing;
1260
1261         target_offset = devinfo->target;
1262         if (devinfo->channel != 'A')
1263                 target_offset += 8;
1264         starget = ahc->platform_data->starget[target_offset];
1265         targ = scsi_transport_target_data(starget);
1266         BUG_ON(targ == NULL);
1267         sdev = targ->sdev[devinfo->lun];
1268         if (sdev == NULL)
1269                 return;
1270         dev = scsi_transport_device_data(sdev);
1271
1272         was_queuing = dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED);
1273         switch (alg) {
1274         default:
1275         case AHC_QUEUE_NONE:
1276                 now_queuing = 0;
1277                 break;
1278         case AHC_QUEUE_BASIC:
1279                 now_queuing = AHC_DEV_Q_BASIC;
1280                 break;
1281         case AHC_QUEUE_TAGGED:
1282                 now_queuing = AHC_DEV_Q_TAGGED;
1283                 break;
1284         }
1285         if ((dev->flags & AHC_DEV_FREEZE_TIL_EMPTY) == 0
1286          && (was_queuing != now_queuing)
1287          && (dev->active != 0)) {
1288                 dev->flags |= AHC_DEV_FREEZE_TIL_EMPTY;
1289                 dev->qfrozen++;
1290         }
1291
1292         dev->flags &= ~(AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED|AHC_DEV_PERIODIC_OTAG);
1293         if (now_queuing) {
1294                 u_int usertags;
1295
1296                 usertags = ahc_linux_user_tagdepth(ahc, devinfo);
1297                 if (!was_queuing) {
1298                         /*
1299                          * Start out agressively and allow our
1300                          * dynamic queue depth algorithm to take
1301                          * care of the rest.
1302                          */
1303                         dev->maxtags = usertags;
1304                         dev->openings = dev->maxtags - dev->active;
1305                 }
1306                 if (dev->maxtags == 0) {
1307                         /*
1308                          * Queueing is disabled by the user.
1309                          */
1310                         dev->openings = 1;
1311                 } else if (alg == AHC_QUEUE_TAGGED) {
1312                         dev->flags |= AHC_DEV_Q_TAGGED;
1313                         if (aic7xxx_periodic_otag != 0)
1314                                 dev->flags |= AHC_DEV_PERIODIC_OTAG;
1315                 } else
1316                         dev->flags |= AHC_DEV_Q_BASIC;
1317         } else {
1318                 /* We can only have one opening. */
1319                 dev->maxtags = 0;
1320                 dev->openings =  1 - dev->active;
1321         }
1322         switch ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED))) {
1323         case AHC_DEV_Q_BASIC:
1324                 scsi_set_tag_type(sdev, MSG_SIMPLE_TAG);
1325                 scsi_activate_tcq(sdev, dev->openings + dev->active);
1326                 break;
1327         case AHC_DEV_Q_TAGGED:
1328                 scsi_set_tag_type(sdev, MSG_ORDERED_TAG);
1329                 scsi_activate_tcq(sdev, dev->openings + dev->active);
1330                 break;
1331         default:
1332                 /*
1333                  * We allow the OS to queue 2 untagged transactions to
1334                  * us at any time even though we can only execute them
1335                  * serially on the controller/device.  This should
1336                  * remove some latency.
1337                  */
1338                 scsi_deactivate_tcq(sdev, 2);
1339                 break;
1340         }
1341 }
1342
1343 int
1344 ahc_platform_abort_scbs(struct ahc_softc *ahc, int target, char channel,
1345                         int lun, u_int tag, role_t role, uint32_t status)
1346 {
1347         return 0;
1348 }
1349
1350 static u_int
1351 ahc_linux_user_tagdepth(struct ahc_softc *ahc, struct ahc_devinfo *devinfo)
1352 {
1353         static int warned_user;
1354         u_int tags;
1355
1356         tags = 0;
1357         if ((ahc->user_discenable & devinfo->target_mask) != 0) {
1358                 if (ahc->unit >= NUM_ELEMENTS(aic7xxx_tag_info)) {
1359                         if (warned_user == 0) {
1360
1361                                 printf(KERN_WARNING
1362 "aic7xxx: WARNING: Insufficient tag_info instances\n"
1363 "aic7xxx: for installed controllers. Using defaults\n"
1364 "aic7xxx: Please update the aic7xxx_tag_info array in\n"
1365 "aic7xxx: the aic7xxx_osm..c source file.\n");
1366                                 warned_user++;
1367                         }
1368                         tags = AHC_MAX_QUEUE;
1369                 } else {
1370                         adapter_tag_info_t *tag_info;
1371
1372                         tag_info = &aic7xxx_tag_info[ahc->unit];
1373                         tags = tag_info->tag_commands[devinfo->target_offset];
1374                         if (tags > AHC_MAX_QUEUE)
1375                                 tags = AHC_MAX_QUEUE;
1376                 }
1377         }
1378         return (tags);
1379 }
1380
1381 /*
1382  * Determines the queue depth for a given device.
1383  */
1384 static void
1385 ahc_linux_device_queue_depth(struct scsi_device *sdev)
1386 {
1387         struct  ahc_devinfo devinfo;
1388         u_int   tags;
1389         struct ahc_softc *ahc = *((struct ahc_softc **)sdev->host->hostdata);
1390
1391         ahc_compile_devinfo(&devinfo,
1392                             sdev->sdev_target->channel == 0
1393                           ? ahc->our_id : ahc->our_id_b,
1394                             sdev->sdev_target->id, sdev->lun,
1395                             sdev->sdev_target->channel == 0 ? 'A' : 'B',
1396                             ROLE_INITIATOR);
1397         tags = ahc_linux_user_tagdepth(ahc, &devinfo);
1398         if (tags != 0 && sdev->tagged_supported != 0) {
1399
1400                 ahc_set_tags(ahc, &devinfo, AHC_QUEUE_TAGGED);
1401                 ahc_print_devinfo(ahc, &devinfo);
1402                 printf("Tagged Queuing enabled.  Depth %d\n", tags);
1403         } else {
1404                 ahc_set_tags(ahc, &devinfo, AHC_QUEUE_NONE);
1405         }
1406 }
1407
1408 static int
1409 ahc_linux_run_command(struct ahc_softc *ahc, struct ahc_linux_device *dev,
1410                       struct scsi_cmnd *cmd)
1411 {
1412         struct   scb *scb;
1413         struct   hardware_scb *hscb;
1414         struct   ahc_initiator_tinfo *tinfo;
1415         struct   ahc_tmode_tstate *tstate;
1416         uint16_t mask;
1417         struct scb_tailq *untagged_q = NULL;
1418
1419         /*
1420          * Schedule us to run later.  The only reason we are not
1421          * running is because the whole controller Q is frozen.
1422          */
1423         if (ahc->platform_data->qfrozen != 0)
1424                 return SCSI_MLQUEUE_HOST_BUSY;
1425
1426         /*
1427          * We only allow one untagged transaction
1428          * per target in the initiator role unless
1429          * we are storing a full busy target *lun*
1430          * table in SCB space.
1431          */
1432         if (!blk_rq_tagged(cmd->request)
1433             && (ahc->features & AHC_SCB_BTT) == 0) {
1434                 int target_offset;
1435
1436                 target_offset = cmd->device->id + cmd->device->channel * 8;
1437                 untagged_q = &(ahc->untagged_queues[target_offset]);
1438                 if (!TAILQ_EMPTY(untagged_q))
1439                         /* if we're already executing an untagged command
1440                          * we're busy to another */
1441                         return SCSI_MLQUEUE_DEVICE_BUSY;
1442         }
1443
1444         /*
1445          * Get an scb to use.
1446          */
1447         scb = ahc_get_scb(ahc);
1448         if (!scb)
1449                 return SCSI_MLQUEUE_HOST_BUSY;
1450
1451         scb->io_ctx = cmd;
1452         scb->platform_data->dev = dev;
1453         hscb = scb->hscb;
1454         cmd->host_scribble = (char *)scb;
1455
1456         /*
1457          * Fill out basics of the HSCB.
1458          */
1459         hscb->control = 0;
1460         hscb->scsiid = BUILD_SCSIID(ahc, cmd);
1461         hscb->lun = cmd->device->lun;
1462         mask = SCB_GET_TARGET_MASK(ahc, scb);
1463         tinfo = ahc_fetch_transinfo(ahc, SCB_GET_CHANNEL(ahc, scb),
1464                                     SCB_GET_OUR_ID(scb),
1465                                     SCB_GET_TARGET(ahc, scb), &tstate);
1466         hscb->scsirate = tinfo->scsirate;
1467         hscb->scsioffset = tinfo->curr.offset;
1468         if ((tstate->ultraenb & mask) != 0)
1469                 hscb->control |= ULTRAENB;
1470
1471         if ((ahc->user_discenable & mask) != 0)
1472                 hscb->control |= DISCENB;
1473
1474         if ((tstate->auto_negotiate & mask) != 0) {
1475                 scb->flags |= SCB_AUTO_NEGOTIATE;
1476                 scb->hscb->control |= MK_MESSAGE;
1477         }
1478
1479         if ((dev->flags & (AHC_DEV_Q_TAGGED|AHC_DEV_Q_BASIC)) != 0) {
1480                 int     msg_bytes;
1481                 uint8_t tag_msgs[2];
1482
1483                 msg_bytes = scsi_populate_tag_msg(cmd, tag_msgs);
1484                 if (msg_bytes && tag_msgs[0] != MSG_SIMPLE_TASK) {
1485                         hscb->control |= tag_msgs[0];
1486                         if (tag_msgs[0] == MSG_ORDERED_TASK)
1487                                 dev->commands_since_idle_or_otag = 0;
1488                 } else if (dev->commands_since_idle_or_otag == AHC_OTAG_THRESH
1489                                 && (dev->flags & AHC_DEV_Q_TAGGED) != 0) {
1490                         hscb->control |= MSG_ORDERED_TASK;
1491                         dev->commands_since_idle_or_otag = 0;
1492                 } else {
1493                         hscb->control |= MSG_SIMPLE_TASK;
1494                 }
1495         }
1496
1497         hscb->cdb_len = cmd->cmd_len;
1498         if (hscb->cdb_len <= 12) {
1499                 memcpy(hscb->shared_data.cdb, cmd->cmnd, hscb->cdb_len);
1500         } else {
1501                 memcpy(hscb->cdb32, cmd->cmnd, hscb->cdb_len);
1502                 scb->flags |= SCB_CDB32_PTR;
1503         }
1504
1505         scb->platform_data->xfer_len = 0;
1506         ahc_set_residual(scb, 0);
1507         ahc_set_sense_residual(scb, 0);
1508         scb->sg_count = 0;
1509         if (cmd->use_sg != 0) {
1510                 struct  ahc_dma_seg *sg;
1511                 struct  scatterlist *cur_seg;
1512                 struct  scatterlist *end_seg;
1513                 int     nseg;
1514
1515                 cur_seg = (struct scatterlist *)cmd->request_buffer;
1516                 nseg = pci_map_sg(ahc->dev_softc, cur_seg, cmd->use_sg,
1517                                   cmd->sc_data_direction);
1518                 end_seg = cur_seg + nseg;
1519                 /* Copy the segments into the SG list. */
1520                 sg = scb->sg_list;
1521                 /*
1522                  * The sg_count may be larger than nseg if
1523                  * a transfer crosses a 32bit page.
1524                  */
1525                 while (cur_seg < end_seg) {
1526                         dma_addr_t addr;
1527                         bus_size_t len;
1528                         int consumed;
1529
1530                         addr = sg_dma_address(cur_seg);
1531                         len = sg_dma_len(cur_seg);
1532                         consumed = ahc_linux_map_seg(ahc, scb,
1533                                                      sg, addr, len);
1534                         sg += consumed;
1535                         scb->sg_count += consumed;
1536                         cur_seg++;
1537                 }
1538                 sg--;
1539                 sg->len |= ahc_htole32(AHC_DMA_LAST_SEG);
1540
1541                 /*
1542                  * Reset the sg list pointer.
1543                  */
1544                 scb->hscb->sgptr =
1545                         ahc_htole32(scb->sg_list_phys | SG_FULL_RESID);
1546
1547                 /*
1548                  * Copy the first SG into the "current"
1549                  * data pointer area.
1550                  */
1551                 scb->hscb->dataptr = scb->sg_list->addr;
1552                 scb->hscb->datacnt = scb->sg_list->len;
1553         } else if (cmd->request_bufflen != 0) {
1554                 struct   ahc_dma_seg *sg;
1555                 dma_addr_t addr;
1556
1557                 sg = scb->sg_list;
1558                 addr = pci_map_single(ahc->dev_softc,
1559                                       cmd->request_buffer,
1560                                       cmd->request_bufflen,
1561                                       cmd->sc_data_direction);
1562                 scb->platform_data->buf_busaddr = addr;
1563                 scb->sg_count = ahc_linux_map_seg(ahc, scb,
1564                                                   sg, addr,
1565                                                   cmd->request_bufflen);
1566                 sg->len |= ahc_htole32(AHC_DMA_LAST_SEG);
1567
1568                 /*
1569                  * Reset the sg list pointer.
1570                  */
1571                 scb->hscb->sgptr =
1572                         ahc_htole32(scb->sg_list_phys | SG_FULL_RESID);
1573
1574                 /*
1575                  * Copy the first SG into the "current"
1576                  * data pointer area.
1577                  */
1578                 scb->hscb->dataptr = sg->addr;
1579                 scb->hscb->datacnt = sg->len;
1580         } else {
1581                 scb->hscb->sgptr = ahc_htole32(SG_LIST_NULL);
1582                 scb->hscb->dataptr = 0;
1583                 scb->hscb->datacnt = 0;
1584                 scb->sg_count = 0;
1585         }
1586
1587         LIST_INSERT_HEAD(&ahc->pending_scbs, scb, pending_links);
1588         dev->openings--;
1589         dev->active++;
1590         dev->commands_issued++;
1591         if ((dev->flags & AHC_DEV_PERIODIC_OTAG) != 0)
1592                 dev->commands_since_idle_or_otag++;
1593
1594         scb->flags |= SCB_ACTIVE;
1595         if (untagged_q) {
1596                 TAILQ_INSERT_TAIL(untagged_q, scb, links.tqe);
1597                 scb->flags |= SCB_UNTAGGEDQ;
1598         }
1599         ahc_queue_scb(ahc, scb);
1600         return 0;
1601 }
1602
1603 /*
1604  * SCSI controller interrupt handler.
1605  */
1606 irqreturn_t
1607 ahc_linux_isr(int irq, void *dev_id, struct pt_regs * regs)
1608 {
1609         struct  ahc_softc *ahc;
1610         u_long  flags;
1611         int     ours;
1612
1613         ahc = (struct ahc_softc *) dev_id;
1614         ahc_lock(ahc, &flags);
1615         ours = ahc_intr(ahc);
1616         ahc_unlock(ahc, &flags);
1617         return IRQ_RETVAL(ours);
1618 }
1619
1620 void
1621 ahc_platform_flushwork(struct ahc_softc *ahc)
1622 {
1623
1624 }
1625
1626 void
1627 ahc_send_async(struct ahc_softc *ahc, char channel,
1628                u_int target, u_int lun, ac_code code, void *arg)
1629 {
1630         switch (code) {
1631         case AC_TRANSFER_NEG:
1632         {
1633                 char    buf[80];
1634                 struct  scsi_target *starget;
1635                 struct  ahc_linux_target *targ;
1636                 struct  info_str info;
1637                 struct  ahc_initiator_tinfo *tinfo;
1638                 struct  ahc_tmode_tstate *tstate;
1639                 int     target_offset;
1640                 unsigned int target_ppr_options;
1641
1642                 BUG_ON(target == CAM_TARGET_WILDCARD);
1643
1644                 info.buffer = buf;
1645                 info.length = sizeof(buf);
1646                 info.offset = 0;
1647                 info.pos = 0;
1648                 tinfo = ahc_fetch_transinfo(ahc, channel,
1649                                                 channel == 'A' ? ahc->our_id
1650                                                                : ahc->our_id_b,
1651                                                 target, &tstate);
1652
1653                 /*
1654                  * Don't bother reporting results while
1655                  * negotiations are still pending.
1656                  */
1657                 if (tinfo->curr.period != tinfo->goal.period
1658                  || tinfo->curr.width != tinfo->goal.width
1659                  || tinfo->curr.offset != tinfo->goal.offset
1660                  || tinfo->curr.ppr_options != tinfo->goal.ppr_options)
1661                         if (bootverbose == 0)
1662                                 break;
1663
1664                 /*
1665                  * Don't bother reporting results that
1666                  * are identical to those last reported.
1667                  */
1668                 target_offset = target;
1669                 if (channel == 'B')
1670                         target_offset += 8;
1671                 starget = ahc->platform_data->starget[target_offset];
1672                 if (starget == NULL)
1673                         break;
1674                 targ = scsi_transport_target_data(starget);
1675
1676                 target_ppr_options =
1677                         (spi_dt(starget) ? MSG_EXT_PPR_DT_REQ : 0)
1678                         + (spi_qas(starget) ? MSG_EXT_PPR_QAS_REQ : 0)
1679                         + (spi_iu(starget) ?  MSG_EXT_PPR_IU_REQ : 0);
1680
1681                 if (tinfo->curr.period == spi_period(starget)
1682                     && tinfo->curr.width == spi_width(starget)
1683                     && tinfo->curr.offset == spi_offset(starget)
1684                  && tinfo->curr.ppr_options == target_ppr_options)
1685                         if (bootverbose == 0)
1686                                 break;
1687
1688                 spi_period(starget) = tinfo->curr.period;
1689                 spi_width(starget) = tinfo->curr.width;
1690                 spi_offset(starget) = tinfo->curr.offset;
1691                 spi_dt(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_DT_REQ ? 1 : 0;
1692                 spi_qas(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_QAS_REQ ? 1 : 0;
1693                 spi_iu(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ ? 1 : 0;
1694                 spi_display_xfer_agreement(starget);
1695                 break;
1696         }
1697         case AC_SENT_BDR:
1698         {
1699                 WARN_ON(lun != CAM_LUN_WILDCARD);
1700                 scsi_report_device_reset(ahc->platform_data->host,
1701                                          channel - 'A', target);
1702                 break;
1703         }
1704         case AC_BUS_RESET:
1705                 if (ahc->platform_data->host != NULL) {
1706                         scsi_report_bus_reset(ahc->platform_data->host,
1707                                               channel - 'A');
1708                 }
1709                 break;
1710         default:
1711                 panic("ahc_send_async: Unexpected async event");
1712         }
1713 }
1714
1715 /*
1716  * Calls the higher level scsi done function and frees the scb.
1717  */
1718 void
1719 ahc_done(struct ahc_softc *ahc, struct scb *scb)
1720 {
1721         struct scsi_cmnd *cmd;
1722         struct     ahc_linux_device *dev;
1723
1724         LIST_REMOVE(scb, pending_links);
1725         if ((scb->flags & SCB_UNTAGGEDQ) != 0) {
1726                 struct scb_tailq *untagged_q;
1727                 int target_offset;
1728
1729                 target_offset = SCB_GET_TARGET_OFFSET(ahc, scb);
1730                 untagged_q = &(ahc->untagged_queues[target_offset]);
1731                 TAILQ_REMOVE(untagged_q, scb, links.tqe);
1732                 BUG_ON(!TAILQ_EMPTY(untagged_q));
1733         }
1734
1735         if ((scb->flags & SCB_ACTIVE) == 0) {
1736                 printf("SCB %d done'd twice\n", scb->hscb->tag);
1737                 ahc_dump_card_state(ahc);
1738                 panic("Stopping for safety");
1739         }
1740         cmd = scb->io_ctx;
1741         dev = scb->platform_data->dev;
1742         dev->active--;
1743         dev->openings++;
1744         if ((cmd->result & (CAM_DEV_QFRZN << 16)) != 0) {
1745                 cmd->result &= ~(CAM_DEV_QFRZN << 16);
1746                 dev->qfrozen--;
1747         }
1748         ahc_linux_unmap_scb(ahc, scb);
1749
1750         /*
1751          * Guard against stale sense data.
1752          * The Linux mid-layer assumes that sense
1753          * was retrieved anytime the first byte of
1754          * the sense buffer looks "sane".
1755          */
1756         cmd->sense_buffer[0] = 0;
1757         if (ahc_get_transaction_status(scb) == CAM_REQ_INPROG) {
1758                 uint32_t amount_xferred;
1759
1760                 amount_xferred =
1761                     ahc_get_transfer_length(scb) - ahc_get_residual(scb);
1762                 if ((scb->flags & SCB_TRANSMISSION_ERROR) != 0) {
1763 #ifdef AHC_DEBUG
1764                         if ((ahc_debug & AHC_SHOW_MISC) != 0) {
1765                                 ahc_print_path(ahc, scb);
1766                                 printf("Set CAM_UNCOR_PARITY\n");
1767                         }
1768 #endif
1769                         ahc_set_transaction_status(scb, CAM_UNCOR_PARITY);
1770 #ifdef AHC_REPORT_UNDERFLOWS
1771                 /*
1772                  * This code is disabled by default as some
1773                  * clients of the SCSI system do not properly
1774                  * initialize the underflow parameter.  This
1775                  * results in spurious termination of commands
1776                  * that complete as expected (e.g. underflow is
1777                  * allowed as command can return variable amounts
1778                  * of data.
1779                  */
1780                 } else if (amount_xferred < scb->io_ctx->underflow) {
1781                         u_int i;
1782
1783                         ahc_print_path(ahc, scb);
1784                         printf("CDB:");
1785                         for (i = 0; i < scb->io_ctx->cmd_len; i++)
1786                                 printf(" 0x%x", scb->io_ctx->cmnd[i]);
1787                         printf("\n");
1788                         ahc_print_path(ahc, scb);
1789                         printf("Saw underflow (%ld of %ld bytes). "
1790                                "Treated as error\n",
1791                                 ahc_get_residual(scb),
1792                                 ahc_get_transfer_length(scb));
1793                         ahc_set_transaction_status(scb, CAM_DATA_RUN_ERR);
1794 #endif
1795                 } else {
1796                         ahc_set_transaction_status(scb, CAM_REQ_CMP);
1797                 }
1798         } else if (ahc_get_transaction_status(scb) == CAM_SCSI_STATUS_ERROR) {
1799                 ahc_linux_handle_scsi_status(ahc, cmd->device, scb);
1800         }
1801
1802         if (dev->openings == 1
1803          && ahc_get_transaction_status(scb) == CAM_REQ_CMP
1804          && ahc_get_scsi_status(scb) != SCSI_STATUS_QUEUE_FULL)
1805                 dev->tag_success_count++;
1806         /*
1807          * Some devices deal with temporary internal resource
1808          * shortages by returning queue full.  When the queue
1809          * full occurrs, we throttle back.  Slowly try to get
1810          * back to our previous queue depth.
1811          */
1812         if ((dev->openings + dev->active) < dev->maxtags
1813          && dev->tag_success_count > AHC_TAG_SUCCESS_INTERVAL) {
1814                 dev->tag_success_count = 0;
1815                 dev->openings++;
1816         }
1817
1818         if (dev->active == 0)
1819                 dev->commands_since_idle_or_otag = 0;
1820
1821         if ((scb->flags & SCB_RECOVERY_SCB) != 0) {
1822                 printf("Recovery SCB completes\n");
1823                 if (ahc_get_transaction_status(scb) == CAM_BDR_SENT
1824                  || ahc_get_transaction_status(scb) == CAM_REQ_ABORTED)
1825                         ahc_set_transaction_status(scb, CAM_CMD_TIMEOUT);
1826                 if ((ahc->platform_data->flags & AHC_UP_EH_SEMAPHORE) != 0) {
1827                         ahc->platform_data->flags &= ~AHC_UP_EH_SEMAPHORE;
1828                         up(&ahc->platform_data->eh_sem);
1829                 }
1830         }
1831
1832         ahc_free_scb(ahc, scb);
1833         ahc_linux_queue_cmd_complete(ahc, cmd);
1834 }
1835
1836 static void
1837 ahc_linux_handle_scsi_status(struct ahc_softc *ahc,
1838                              struct scsi_device *sdev, struct scb *scb)
1839 {
1840         struct  ahc_devinfo devinfo;
1841         struct ahc_linux_device *dev = scsi_transport_device_data(sdev);
1842
1843         ahc_compile_devinfo(&devinfo,
1844                             ahc->our_id,
1845                             sdev->sdev_target->id, sdev->lun,
1846                             sdev->sdev_target->channel == 0 ? 'A' : 'B',
1847                             ROLE_INITIATOR);
1848
1849         /*
1850          * We don't currently trust the mid-layer to
1851          * properly deal with queue full or busy.  So,
1852          * when one occurs, we tell the mid-layer to
1853          * unconditionally requeue the command to us
1854          * so that we can retry it ourselves.  We also
1855          * implement our own throttling mechanism so
1856          * we don't clobber the device with too many
1857          * commands.
1858          */
1859         switch (ahc_get_scsi_status(scb)) {
1860         default:
1861                 break;
1862         case SCSI_STATUS_CHECK_COND:
1863         case SCSI_STATUS_CMD_TERMINATED:
1864         {
1865                 struct scsi_cmnd *cmd;
1866
1867                 /*
1868                  * Copy sense information to the OS's cmd
1869                  * structure if it is available.
1870                  */
1871                 cmd = scb->io_ctx;
1872                 if (scb->flags & SCB_SENSE) {
1873                         u_int sense_size;
1874
1875                         sense_size = MIN(sizeof(struct scsi_sense_data)
1876                                        - ahc_get_sense_residual(scb),
1877                                          sizeof(cmd->sense_buffer));
1878                         memcpy(cmd->sense_buffer,
1879                                ahc_get_sense_buf(ahc, scb), sense_size);
1880                         if (sense_size < sizeof(cmd->sense_buffer))
1881                                 memset(&cmd->sense_buffer[sense_size], 0,
1882                                        sizeof(cmd->sense_buffer) - sense_size);
1883                         cmd->result |= (DRIVER_SENSE << 24);
1884 #ifdef AHC_DEBUG
1885                         if (ahc_debug & AHC_SHOW_SENSE) {
1886                                 int i;
1887
1888                                 printf("Copied %d bytes of sense data:",
1889                                        sense_size);
1890                                 for (i = 0; i < sense_size; i++) {
1891                                         if ((i & 0xF) == 0)
1892                                                 printf("\n");
1893                                         printf("0x%x ", cmd->sense_buffer[i]);
1894                                 }
1895                                 printf("\n");
1896                         }
1897 #endif
1898                 }
1899                 break;
1900         }
1901         case SCSI_STATUS_QUEUE_FULL:
1902         {
1903                 /*
1904                  * By the time the core driver has returned this
1905                  * command, all other commands that were queued
1906                  * to us but not the device have been returned.
1907                  * This ensures that dev->active is equal to
1908                  * the number of commands actually queued to
1909                  * the device.
1910                  */
1911                 dev->tag_success_count = 0;
1912                 if (dev->active != 0) {
1913                         /*
1914                          * Drop our opening count to the number
1915                          * of commands currently outstanding.
1916                          */
1917                         dev->openings = 0;
1918 /*
1919                         ahc_print_path(ahc, scb);
1920                         printf("Dropping tag count to %d\n", dev->active);
1921  */
1922                         if (dev->active == dev->tags_on_last_queuefull) {
1923
1924                                 dev->last_queuefull_same_count++;
1925                                 /*
1926                                  * If we repeatedly see a queue full
1927                                  * at the same queue depth, this
1928                                  * device has a fixed number of tag
1929                                  * slots.  Lock in this tag depth
1930                                  * so we stop seeing queue fulls from
1931                                  * this device.
1932                                  */
1933                                 if (dev->last_queuefull_same_count
1934                                  == AHC_LOCK_TAGS_COUNT) {
1935                                         dev->maxtags = dev->active;
1936                                         ahc_print_path(ahc, scb);
1937                                         printf("Locking max tag count at %d\n",
1938                                                dev->active);
1939                                 }
1940                         } else {
1941                                 dev->tags_on_last_queuefull = dev->active;
1942                                 dev->last_queuefull_same_count = 0;
1943                         }
1944                         ahc_set_transaction_status(scb, CAM_REQUEUE_REQ);
1945                         ahc_set_scsi_status(scb, SCSI_STATUS_OK);
1946                         ahc_platform_set_tags(ahc, &devinfo,
1947                                      (dev->flags & AHC_DEV_Q_BASIC)
1948                                    ? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
1949                         break;
1950                 }
1951                 /*
1952                  * Drop down to a single opening, and treat this
1953                  * as if the target returned BUSY SCSI status.
1954                  */
1955                 dev->openings = 1;
1956                 ahc_set_scsi_status(scb, SCSI_STATUS_BUSY);
1957                 ahc_platform_set_tags(ahc, &devinfo,
1958                              (dev->flags & AHC_DEV_Q_BASIC)
1959                            ? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
1960                 break;
1961         }
1962         }
1963 }
1964
1965 static void
1966 ahc_linux_queue_cmd_complete(struct ahc_softc *ahc, struct scsi_cmnd *cmd)
1967 {
1968         /*
1969          * Map CAM error codes into Linux Error codes.  We
1970          * avoid the conversion so that the DV code has the
1971          * full error information available when making
1972          * state change decisions.
1973          */
1974         {
1975                 u_int new_status;
1976
1977                 switch (ahc_cmd_get_transaction_status(cmd)) {
1978                 case CAM_REQ_INPROG:
1979                 case CAM_REQ_CMP:
1980                 case CAM_SCSI_STATUS_ERROR:
1981                         new_status = DID_OK;
1982                         break;
1983                 case CAM_REQ_ABORTED:
1984                         new_status = DID_ABORT;
1985                         break;
1986                 case CAM_BUSY:
1987                         new_status = DID_BUS_BUSY;
1988                         break;
1989                 case CAM_REQ_INVALID:
1990                 case CAM_PATH_INVALID:
1991                         new_status = DID_BAD_TARGET;
1992                         break;
1993                 case CAM_SEL_TIMEOUT:
1994                         new_status = DID_NO_CONNECT;
1995                         break;
1996                 case CAM_SCSI_BUS_RESET:
1997                 case CAM_BDR_SENT:
1998                         new_status = DID_RESET;
1999                         break;
2000                 case CAM_UNCOR_PARITY:
2001                         new_status = DID_PARITY;
2002                         break;
2003                 case CAM_CMD_TIMEOUT:
2004                         new_status = DID_TIME_OUT;
2005                         break;
2006                 case CAM_UA_ABORT:
2007                 case CAM_REQ_CMP_ERR:
2008                 case CAM_AUTOSENSE_FAIL:
2009                 case CAM_NO_HBA:
2010                 case CAM_DATA_RUN_ERR:
2011                 case CAM_UNEXP_BUSFREE:
2012                 case CAM_SEQUENCE_FAIL:
2013                 case CAM_CCB_LEN_ERR:
2014                 case CAM_PROVIDE_FAIL:
2015                 case CAM_REQ_TERMIO:
2016                 case CAM_UNREC_HBA_ERROR:
2017                 case CAM_REQ_TOO_BIG:
2018                         new_status = DID_ERROR;
2019                         break;
2020                 case CAM_REQUEUE_REQ:
2021                         new_status = DID_REQUEUE;
2022                         break;
2023                 default:
2024                         /* We should never get here */
2025                         new_status = DID_ERROR;
2026                         break;
2027                 }
2028
2029                 ahc_cmd_set_transaction_status(cmd, new_status);
2030         }
2031
2032         cmd->scsi_done(cmd);
2033 }
2034
2035 static void
2036 ahc_linux_sem_timeout(u_long arg)
2037 {
2038         struct  ahc_softc *ahc;
2039         u_long  s;
2040
2041         ahc = (struct ahc_softc *)arg;
2042
2043         ahc_lock(ahc, &s);
2044         if ((ahc->platform_data->flags & AHC_UP_EH_SEMAPHORE) != 0) {
2045                 ahc->platform_data->flags &= ~AHC_UP_EH_SEMAPHORE;
2046                 up(&ahc->platform_data->eh_sem);
2047         }
2048         ahc_unlock(ahc, &s);
2049 }
2050
2051 static void
2052 ahc_linux_freeze_simq(struct ahc_softc *ahc)
2053 {
2054         ahc->platform_data->qfrozen++;
2055         if (ahc->platform_data->qfrozen == 1) {
2056                 scsi_block_requests(ahc->platform_data->host);
2057
2058                 /* XXX What about Twin channels? */
2059                 ahc_platform_abort_scbs(ahc, CAM_TARGET_WILDCARD, ALL_CHANNELS,
2060                                         CAM_LUN_WILDCARD, SCB_LIST_NULL,
2061                                         ROLE_INITIATOR, CAM_REQUEUE_REQ);
2062         }
2063 }
2064
2065 static void
2066 ahc_linux_release_simq(u_long arg)
2067 {
2068         struct ahc_softc *ahc;
2069         u_long s;
2070         int    unblock_reqs;
2071
2072         ahc = (struct ahc_softc *)arg;
2073
2074         unblock_reqs = 0;
2075         ahc_lock(ahc, &s);
2076         if (ahc->platform_data->qfrozen > 0)
2077                 ahc->platform_data->qfrozen--;
2078         if (ahc->platform_data->qfrozen == 0)
2079                 unblock_reqs = 1;
2080         ahc_unlock(ahc, &s);
2081         /*
2082          * There is still a race here.  The mid-layer
2083          * should keep its own freeze count and use
2084          * a bottom half handler to run the queues
2085          * so we can unblock with our own lock held.
2086          */
2087         if (unblock_reqs)
2088                 scsi_unblock_requests(ahc->platform_data->host);
2089 }
2090
2091 static int
2092 ahc_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag)
2093 {
2094         struct ahc_softc *ahc;
2095         struct ahc_linux_device *dev;
2096         struct scb *pending_scb;
2097         u_int  saved_scbptr;
2098         u_int  active_scb_index;
2099         u_int  last_phase;
2100         u_int  saved_scsiid;
2101         u_int  cdb_byte;
2102         int    retval;
2103         int    was_paused;
2104         int    paused;
2105         int    wait;
2106         int    disconnected;
2107         unsigned long flags;
2108
2109         pending_scb = NULL;
2110         paused = FALSE;
2111         wait = FALSE;
2112         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
2113
2114         scmd_printk(KERN_INFO, cmd, "Attempting to queue a%s message\n",
2115                flag == SCB_ABORT ? "n ABORT" : " TARGET RESET");
2116
2117         printf("CDB:");
2118         for (cdb_byte = 0; cdb_byte < cmd->cmd_len; cdb_byte++)
2119                 printf(" 0x%x", cmd->cmnd[cdb_byte]);
2120         printf("\n");
2121
2122         ahc_lock(ahc, &flags);
2123
2124         /*
2125          * First determine if we currently own this command.
2126          * Start by searching the device queue.  If not found
2127          * there, check the pending_scb list.  If not found
2128          * at all, and the system wanted us to just abort the
2129          * command, return success.
2130          */
2131         dev = scsi_transport_device_data(cmd->device);
2132
2133         if (dev == NULL) {
2134                 /*
2135                  * No target device for this command exists,
2136                  * so we must not still own the command.
2137                  */
2138                 printf("%s:%d:%d:%d: Is not an active device\n",
2139                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2140                        cmd->device->lun);
2141                 retval = SUCCESS;
2142                 goto no_cmd;
2143         }
2144
2145         if ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED)) == 0
2146          && ahc_search_untagged_queues(ahc, cmd, cmd->device->id,
2147                                        cmd->device->channel + 'A',
2148                                        cmd->device->lun,
2149                                        CAM_REQ_ABORTED, SEARCH_COMPLETE) != 0) {
2150                 printf("%s:%d:%d:%d: Command found on untagged queue\n",
2151                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2152                        cmd->device->lun);
2153                 retval = SUCCESS;
2154                 goto done;
2155         }
2156
2157         /*
2158          * See if we can find a matching cmd in the pending list.
2159          */
2160         LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
2161                 if (pending_scb->io_ctx == cmd)
2162                         break;
2163         }
2164
2165         if (pending_scb == NULL && flag == SCB_DEVICE_RESET) {
2166
2167                 /* Any SCB for this device will do for a target reset */
2168                 LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
2169                         if (ahc_match_scb(ahc, pending_scb, scmd_id(cmd),
2170                                           scmd_channel(cmd) + 'A',
2171                                           CAM_LUN_WILDCARD,
2172                                           SCB_LIST_NULL, ROLE_INITIATOR) == 0)
2173                                 break;
2174                 }
2175         }
2176
2177         if (pending_scb == NULL) {
2178                 scmd_printk(KERN_INFO, cmd, "Command not found\n");
2179                 goto no_cmd;
2180         }
2181
2182         if ((pending_scb->flags & SCB_RECOVERY_SCB) != 0) {
2183                 /*
2184                  * We can't queue two recovery actions using the same SCB
2185                  */
2186                 retval = FAILED;
2187                 goto  done;
2188         }
2189
2190         /*
2191          * Ensure that the card doesn't do anything
2192          * behind our back and that we didn't "just" miss
2193          * an interrupt that would affect this cmd.
2194          */
2195         was_paused = ahc_is_paused(ahc);
2196         ahc_pause_and_flushwork(ahc);
2197         paused = TRUE;
2198
2199         if ((pending_scb->flags & SCB_ACTIVE) == 0) {
2200                 scmd_printk(KERN_INFO, cmd, "Command already completed\n");
2201                 goto no_cmd;
2202         }
2203
2204         printf("%s: At time of recovery, card was %spaused\n",
2205                ahc_name(ahc), was_paused ? "" : "not ");
2206         ahc_dump_card_state(ahc);
2207
2208         disconnected = TRUE;
2209         if (flag == SCB_ABORT) {
2210                 if (ahc_search_qinfifo(ahc, cmd->device->id,
2211                                        cmd->device->channel + 'A',
2212                                        cmd->device->lun,
2213                                        pending_scb->hscb->tag,
2214                                        ROLE_INITIATOR, CAM_REQ_ABORTED,
2215                                        SEARCH_COMPLETE) > 0) {
2216                         printf("%s:%d:%d:%d: Cmd aborted from QINFIFO\n",
2217                                ahc_name(ahc), cmd->device->channel,
2218                                         cmd->device->id, cmd->device->lun);
2219                         retval = SUCCESS;
2220                         goto done;
2221                 }
2222         } else if (ahc_search_qinfifo(ahc, cmd->device->id,
2223                                       cmd->device->channel + 'A',
2224                                       cmd->device->lun, pending_scb->hscb->tag,
2225                                       ROLE_INITIATOR, /*status*/0,
2226                                       SEARCH_COUNT) > 0) {
2227                 disconnected = FALSE;
2228         }
2229
2230         if (disconnected && (ahc_inb(ahc, SEQ_FLAGS) & NOT_IDENTIFIED) == 0) {
2231                 struct scb *bus_scb;
2232
2233                 bus_scb = ahc_lookup_scb(ahc, ahc_inb(ahc, SCB_TAG));
2234                 if (bus_scb == pending_scb)
2235                         disconnected = FALSE;
2236                 else if (flag != SCB_ABORT
2237                       && ahc_inb(ahc, SAVED_SCSIID) == pending_scb->hscb->scsiid
2238                       && ahc_inb(ahc, SAVED_LUN) == SCB_GET_LUN(pending_scb))
2239                         disconnected = FALSE;
2240         }
2241
2242         /*
2243          * At this point, pending_scb is the scb associated with the
2244          * passed in command.  That command is currently active on the
2245          * bus, is in the disconnected state, or we're hoping to find
2246          * a command for the same target active on the bus to abuse to
2247          * send a BDR.  Queue the appropriate message based on which of
2248          * these states we are in.
2249          */
2250         last_phase = ahc_inb(ahc, LASTPHASE);
2251         saved_scbptr = ahc_inb(ahc, SCBPTR);
2252         active_scb_index = ahc_inb(ahc, SCB_TAG);
2253         saved_scsiid = ahc_inb(ahc, SAVED_SCSIID);
2254         if (last_phase != P_BUSFREE
2255          && (pending_scb->hscb->tag == active_scb_index
2256           || (flag == SCB_DEVICE_RESET
2257            && SCSIID_TARGET(ahc, saved_scsiid) == scmd_id(cmd)))) {
2258
2259                 /*
2260                  * We're active on the bus, so assert ATN
2261                  * and hope that the target responds.
2262                  */
2263                 pending_scb = ahc_lookup_scb(ahc, active_scb_index);
2264                 pending_scb->flags |= SCB_RECOVERY_SCB|flag;
2265                 ahc_outb(ahc, MSG_OUT, HOST_MSG);
2266                 ahc_outb(ahc, SCSISIGO, last_phase|ATNO);
2267                 scmd_printk(KERN_INFO, cmd, "Device is active, asserting ATN\n");
2268                 wait = TRUE;
2269         } else if (disconnected) {
2270
2271                 /*
2272                  * Actually re-queue this SCB in an attempt
2273                  * to select the device before it reconnects.
2274                  * In either case (selection or reselection),
2275                  * we will now issue the approprate message
2276                  * to the timed-out device.
2277                  *
2278                  * Set the MK_MESSAGE control bit indicating
2279                  * that we desire to send a message.  We
2280                  * also set the disconnected flag since
2281                  * in the paging case there is no guarantee
2282                  * that our SCB control byte matches the
2283                  * version on the card.  We don't want the
2284                  * sequencer to abort the command thinking
2285                  * an unsolicited reselection occurred.
2286                  */
2287                 pending_scb->hscb->control |= MK_MESSAGE|DISCONNECTED;
2288                 pending_scb->flags |= SCB_RECOVERY_SCB|flag;
2289
2290                 /*
2291                  * Remove any cached copy of this SCB in the
2292                  * disconnected list in preparation for the
2293                  * queuing of our abort SCB.  We use the
2294                  * same element in the SCB, SCB_NEXT, for
2295                  * both the qinfifo and the disconnected list.
2296                  */
2297                 ahc_search_disc_list(ahc, cmd->device->id,
2298                                      cmd->device->channel + 'A',
2299                                      cmd->device->lun, pending_scb->hscb->tag,
2300                                      /*stop_on_first*/TRUE,
2301                                      /*remove*/TRUE,
2302                                      /*save_state*/FALSE);
2303
2304                 /*
2305                  * In the non-paging case, the sequencer will
2306                  * never re-reference the in-core SCB.
2307                  * To make sure we are notified during
2308                  * reslection, set the MK_MESSAGE flag in
2309                  * the card's copy of the SCB.
2310                  */
2311                 if ((ahc->flags & AHC_PAGESCBS) == 0) {
2312                         ahc_outb(ahc, SCBPTR, pending_scb->hscb->tag);
2313                         ahc_outb(ahc, SCB_CONTROL,
2314                                  ahc_inb(ahc, SCB_CONTROL)|MK_MESSAGE);
2315                 }
2316
2317                 /*
2318                  * Clear out any entries in the QINFIFO first
2319                  * so we are the next SCB for this target
2320                  * to run.
2321                  */
2322                 ahc_search_qinfifo(ahc, cmd->device->id,
2323                                    cmd->device->channel + 'A',
2324                                    cmd->device->lun, SCB_LIST_NULL,
2325                                    ROLE_INITIATOR, CAM_REQUEUE_REQ,
2326                                    SEARCH_COMPLETE);
2327                 ahc_qinfifo_requeue_tail(ahc, pending_scb);
2328                 ahc_outb(ahc, SCBPTR, saved_scbptr);
2329                 ahc_print_path(ahc, pending_scb);
2330                 printf("Device is disconnected, re-queuing SCB\n");
2331                 wait = TRUE;
2332         } else {
2333                 scmd_printk(KERN_INFO, cmd, "Unable to deliver message\n");
2334                 retval = FAILED;
2335                 goto done;
2336         }
2337
2338 no_cmd:
2339         /*
2340          * Our assumption is that if we don't have the command, no
2341          * recovery action was required, so we return success.  Again,
2342          * the semantics of the mid-layer recovery engine are not
2343          * well defined, so this may change in time.
2344          */
2345         retval = SUCCESS;
2346 done:
2347         if (paused)
2348                 ahc_unpause(ahc);
2349         if (wait) {
2350                 struct timer_list timer;
2351                 int ret;
2352
2353                 ahc->platform_data->flags |= AHC_UP_EH_SEMAPHORE;
2354                 ahc_unlock(ahc, &flags);
2355
2356                 init_timer(&timer);
2357                 timer.data = (u_long)ahc;
2358                 timer.expires = jiffies + (5 * HZ);
2359                 timer.function = ahc_linux_sem_timeout;
2360                 add_timer(&timer);
2361                 printf("Recovery code sleeping\n");
2362                 down(&ahc->platform_data->eh_sem);
2363                 printf("Recovery code awake\n");
2364                 ret = del_timer_sync(&timer);
2365                 if (ret == 0) {
2366                         printf("Timer Expired\n");
2367                         retval = FAILED;
2368                 }
2369         } else
2370                 ahc_unlock(ahc, &flags);
2371         return (retval);
2372 }
2373
2374 void
2375 ahc_platform_dump_card_state(struct ahc_softc *ahc)
2376 {
2377 }
2378
2379 static void ahc_linux_set_width(struct scsi_target *starget, int width)
2380 {
2381         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2382         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2383         struct ahc_devinfo devinfo;
2384         unsigned long flags;
2385
2386         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2387                             starget->channel + 'A', ROLE_INITIATOR);
2388         ahc_lock(ahc, &flags);
2389         ahc_set_width(ahc, &devinfo, width, AHC_TRANS_GOAL, FALSE);
2390         ahc_unlock(ahc, &flags);
2391 }
2392
2393 static void ahc_linux_set_period(struct scsi_target *starget, int period)
2394 {
2395         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2396         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2397         struct ahc_tmode_tstate *tstate;
2398         struct ahc_initiator_tinfo *tinfo
2399                 = ahc_fetch_transinfo(ahc,
2400                                       starget->channel + 'A',
2401                                       shost->this_id, starget->id, &tstate);
2402         struct ahc_devinfo devinfo;
2403         unsigned int ppr_options = tinfo->goal.ppr_options;
2404         unsigned long flags;
2405         unsigned long offset = tinfo->goal.offset;
2406         struct ahc_syncrate *syncrate;
2407
2408         if (offset == 0)
2409                 offset = MAX_OFFSET;
2410
2411         if (period < 9)
2412                 period = 9;     /* 12.5ns is our minimum */
2413         if (period == 9)
2414                 ppr_options |= MSG_EXT_PPR_DT_REQ;
2415
2416         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2417                             starget->channel + 'A', ROLE_INITIATOR);
2418
2419         /* all PPR requests apart from QAS require wide transfers */
2420         if (ppr_options & ~MSG_EXT_PPR_QAS_REQ) {
2421                 if (spi_width(starget) == 0)
2422                         ppr_options &= MSG_EXT_PPR_QAS_REQ;
2423         }
2424
2425         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2426         ahc_lock(ahc, &flags);
2427         ahc_set_syncrate(ahc, &devinfo, syncrate, period, offset,
2428                          ppr_options, AHC_TRANS_GOAL, FALSE);
2429         ahc_unlock(ahc, &flags);
2430 }
2431
2432 static void ahc_linux_set_offset(struct scsi_target *starget, int offset)
2433 {
2434         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2435         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2436         struct ahc_tmode_tstate *tstate;
2437         struct ahc_initiator_tinfo *tinfo
2438                 = ahc_fetch_transinfo(ahc,
2439                                       starget->channel + 'A',
2440                                       shost->this_id, starget->id, &tstate);
2441         struct ahc_devinfo devinfo;
2442         unsigned int ppr_options = 0;
2443         unsigned int period = 0;
2444         unsigned long flags;
2445         struct ahc_syncrate *syncrate = NULL;
2446
2447         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2448                             starget->channel + 'A', ROLE_INITIATOR);
2449         if (offset != 0) {
2450                 syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2451                 period = tinfo->goal.period;
2452                 ppr_options = tinfo->goal.ppr_options;
2453         }
2454         ahc_lock(ahc, &flags);
2455         ahc_set_syncrate(ahc, &devinfo, syncrate, period, offset,
2456                          ppr_options, AHC_TRANS_GOAL, FALSE);
2457         ahc_unlock(ahc, &flags);
2458 }
2459
2460 static void ahc_linux_set_dt(struct scsi_target *starget, int dt)
2461 {
2462         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2463         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2464         struct ahc_tmode_tstate *tstate;
2465         struct ahc_initiator_tinfo *tinfo
2466                 = ahc_fetch_transinfo(ahc,
2467                                       starget->channel + 'A',
2468                                       shost->this_id, starget->id, &tstate);
2469         struct ahc_devinfo devinfo;
2470         unsigned int ppr_options = tinfo->goal.ppr_options
2471                 & ~MSG_EXT_PPR_DT_REQ;
2472         unsigned int period = tinfo->goal.period;
2473         unsigned int width = tinfo->goal.width;
2474         unsigned long flags;
2475         struct ahc_syncrate *syncrate;
2476
2477         if (dt) {
2478                 ppr_options |= MSG_EXT_PPR_DT_REQ;
2479                 if (!width)
2480                         ahc_linux_set_width(starget, 1);
2481         } else if (period == 9)
2482                 period = 10;    /* if resetting DT, period must be >= 25ns */
2483
2484         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2485                             starget->channel + 'A', ROLE_INITIATOR);
2486         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options,AHC_SYNCRATE_DT);
2487         ahc_lock(ahc, &flags);
2488         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2489                          ppr_options, AHC_TRANS_GOAL, FALSE);
2490         ahc_unlock(ahc, &flags);
2491 }
2492
2493 #if 0
2494 /* FIXME: This code claims to support IU and QAS.  However, the actual
2495  * sequencer code and aic7xxx_core have no support for these parameters and
2496  * will get into a bad state if they're negotiated.  Do not enable this
2497  * unless you know what you're doing */
2498 static void ahc_linux_set_qas(struct scsi_target *starget, int qas)
2499 {
2500         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2501         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2502         struct ahc_tmode_tstate *tstate;
2503         struct ahc_initiator_tinfo *tinfo
2504                 = ahc_fetch_transinfo(ahc,
2505                                       starget->channel + 'A',
2506                                       shost->this_id, starget->id, &tstate);
2507         struct ahc_devinfo devinfo;
2508         unsigned int ppr_options = tinfo->goal.ppr_options
2509                 & ~MSG_EXT_PPR_QAS_REQ;
2510         unsigned int period = tinfo->goal.period;
2511         unsigned long flags;
2512         struct ahc_syncrate *syncrate;
2513
2514         if (qas)
2515                 ppr_options |= MSG_EXT_PPR_QAS_REQ;
2516
2517         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2518                             starget->channel + 'A', ROLE_INITIATOR);
2519         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2520         ahc_lock(ahc, &flags);
2521         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2522                          ppr_options, AHC_TRANS_GOAL, FALSE);
2523         ahc_unlock(ahc, &flags);
2524 }
2525
2526 static void ahc_linux_set_iu(struct scsi_target *starget, int iu)
2527 {
2528         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2529         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2530         struct ahc_tmode_tstate *tstate;
2531         struct ahc_initiator_tinfo *tinfo
2532                 = ahc_fetch_transinfo(ahc,
2533                                       starget->channel + 'A',
2534                                       shost->this_id, starget->id, &tstate);
2535         struct ahc_devinfo devinfo;
2536         unsigned int ppr_options = tinfo->goal.ppr_options
2537                 & ~MSG_EXT_PPR_IU_REQ;
2538         unsigned int period = tinfo->goal.period;
2539         unsigned long flags;
2540         struct ahc_syncrate *syncrate;
2541
2542         if (iu)
2543                 ppr_options |= MSG_EXT_PPR_IU_REQ;
2544
2545         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2546                             starget->channel + 'A', ROLE_INITIATOR);
2547         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2548         ahc_lock(ahc, &flags);
2549         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2550                          ppr_options, AHC_TRANS_GOAL, FALSE);
2551         ahc_unlock(ahc, &flags);
2552 }
2553 #endif
2554
2555 static struct spi_function_template ahc_linux_transport_functions = {
2556         .set_offset     = ahc_linux_set_offset,
2557         .show_offset    = 1,
2558         .set_period     = ahc_linux_set_period,
2559         .show_period    = 1,
2560         .set_width      = ahc_linux_set_width,
2561         .show_width     = 1,
2562         .set_dt         = ahc_linux_set_dt,
2563         .show_dt        = 1,
2564 #if 0
2565         .set_iu         = ahc_linux_set_iu,
2566         .show_iu        = 1,
2567         .set_qas        = ahc_linux_set_qas,
2568         .show_qas       = 1,
2569 #endif
2570 };
2571
2572
2573
2574 static int __init
2575 ahc_linux_init(void)
2576 {
2577         /*
2578          * If we've been passed any parameters, process them now.
2579          */
2580         if (aic7xxx)
2581                 aic7xxx_setup(aic7xxx);
2582
2583         ahc_linux_transport_template =
2584                 spi_attach_transport(&ahc_linux_transport_functions);
2585         if (!ahc_linux_transport_template)
2586                 return -ENODEV;
2587
2588         scsi_transport_reserve_target(ahc_linux_transport_template,
2589                                       sizeof(struct ahc_linux_target));
2590         scsi_transport_reserve_device(ahc_linux_transport_template,
2591                                       sizeof(struct ahc_linux_device));
2592
2593         ahc_linux_pci_init();
2594         ahc_linux_eisa_init();
2595         return 0;
2596 }
2597
2598 static void
2599 ahc_linux_exit(void)
2600 {
2601         ahc_linux_pci_exit();
2602         ahc_linux_eisa_exit();
2603         spi_release_transport(ahc_linux_transport_template);
2604 }
2605
2606 module_init(ahc_linux_init);
2607 module_exit(ahc_linux_exit);