Pileus Git - ~andy/linux/blob - 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 /*
 129  * Include aiclib.c as part of our
 130  * "module dependencies are hard" work around.
 131  */
 132 #include "aiclib.c"
 133
 134 #include <linux/init.h>         /* __setup */
 135 #include <linux/mm.h>           /* For fetching system memory size */
 136 #include <linux/blkdev.h>               /* For block_size() */
 137 #include <linux/delay.h>        /* For ssleep/msleep */
 138
 139 /*
 140  * Lock protecting manipulation of the ahc softc list.
 141  */
 142 spinlock_t ahc_list_spinlock;
 143
 144 /*
 145  * Set this to the delay in seconds after SCSI bus reset.
 146  * Note, we honor this only for the initial bus reset.
 147  * The scsi error recovery code performs its own bus settle
 148  * delay handling for error recovery actions.
 149  */
 150 #ifdef CONFIG_AIC7XXX_RESET_DELAY_MS
 151 #define AIC7XXX_RESET_DELAY CONFIG_AIC7XXX_RESET_DELAY_MS
 152 #else
 153 #define AIC7XXX_RESET_DELAY 5000
 154 #endif
 155
 156 /*
 157  * Control collection of SCSI transfer statistics for the /proc filesystem.
 158  *
 159  * NOTE: Do NOT enable this when running on kernels version 1.2.x and below.
 160  * NOTE: This does affect performance since it has to maintain statistics.
 161  */
 162 #ifdef CONFIG_AIC7XXX_PROC_STATS
 163 #define AIC7XXX_PROC_STATS
 164 #endif
 165
 166 /*
 167  * To change the default number of tagged transactions allowed per-device,
 168  * add a line to the lilo.conf file like:
 169  * append="aic7xxx=verbose,tag_info:{{32,32,32,32},{32,32,32,32}}"
 170  * which will result in the first four devices on the first two
 171  * controllers being set to a tagged queue depth of 32.
 172  *
 173  * The tag_commands is an array of 16 to allow for wide and twin adapters.
 174  * Twin adapters will use indexes 0-7 for channel 0, and indexes 8-15
 175  * for channel 1.
 176  */
 177 typedef struct {
 178         uint8_t tag_commands[16];       /* Allow for wide/twin adapters. */
 179 } adapter_tag_info_t;
 180
 181 /*
 182  * Modify this as you see fit for your system.
 183  *
 184  * 0                    tagged queuing disabled
 185  * 1 <= n <= 253        n == max tags ever dispatched.
 186  *
 187  * The driver will throttle the number of commands dispatched to a
 188  * device if it returns queue full.  For devices with a fixed maximum
 189  * queue depth, the driver will eventually determine this depth and
 190  * lock it in (a console message is printed to indicate that a lock
 191  * has occurred).  On some devices, queue full is returned for a temporary
 192  * resource shortage.  These devices will return queue full at varying
 193  * depths.  The driver will throttle back when the queue fulls occur and
 194  * attempt to slowly increase the depth over time as the device recovers
 195  * from the resource shortage.
 196  *
 197  * In this example, the first line will disable tagged queueing for all
 198  * the devices on the first probed aic7xxx adapter.
 199  *
 200  * The second line enables tagged queueing with 4 commands/LUN for IDs
 201  * (0, 2-11, 13-15), disables tagged queueing for ID 12, and tells the
 202  * driver to attempt to use up to 64 tags for ID 1.
 203  *
 204  * The third line is the same as the first line.
 205  *
 206  * The fourth line disables tagged queueing for devices 0 and 3.  It
 207  * enables tagged queueing for the other IDs, with 16 commands/LUN
 208  * for IDs 1 and 4, 127 commands/LUN for ID 8, and 4 commands/LUN for
 209  * IDs 2, 5-7, and 9-15.
 210  */
 211
 212 /*
 213  * NOTE: The below structure is for reference only, the actual structure
 214  *       to modify in order to change things is just below this comment block.
 215 adapter_tag_info_t aic7xxx_tag_info[] =
 216 {
 217         {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
 218         {{4, 64, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 0, 4, 4, 4}},
 219         {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
 220         {{0, 16, 4, 0, 16, 4, 4, 4, 127, 4, 4, 4, 4, 4, 4, 4}}
 221 };
 222 */
 223
 224 #ifdef CONFIG_AIC7XXX_CMDS_PER_DEVICE
 225 #define AIC7XXX_CMDS_PER_DEVICE CONFIG_AIC7XXX_CMDS_PER_DEVICE
 226 #else
 227 #define AIC7XXX_CMDS_PER_DEVICE AHC_MAX_QUEUE
 228 #endif
 229
 230 #define AIC7XXX_CONFIGED_TAG_COMMANDS {                                 \
 231         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 232         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 233         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 234         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 235         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 236         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 237         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 238         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE                \
 239 }
 240
 241 /*
 242  * By default, use the number of commands specified by
 243  * the users kernel configuration.
 244  */
 245 static adapter_tag_info_t aic7xxx_tag_info[] =
 246 {
 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         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 254         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 255         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 256         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 257         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 258         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 259         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 260         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 261         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 262         {AIC7XXX_CONFIGED_TAG_COMMANDS}
 263 };
 264
 265 /*
 266  * There should be a specific return value for this in scsi.h, but
 267  * it seems that most drivers ignore it.
 268  */
 269 #define DID_UNDERFLOW   DID_ERROR
 270
 271 void
 272 ahc_print_path(struct ahc_softc *ahc, struct scb *scb)
 273 {
 274         printk("(scsi%d:%c:%d:%d): ",
 275                ahc->platform_data->host->host_no,
 276                scb != NULL ? SCB_GET_CHANNEL(ahc, scb) : 'X',
 277                scb != NULL ? SCB_GET_TARGET(ahc, scb) : -1,
 278                scb != NULL ? SCB_GET_LUN(scb) : -1);
 279 }
 280
 281 /*
 282  * XXX - these options apply unilaterally to _all_ 274x/284x/294x
 283  *       cards in the system.  This should be fixed.  Exceptions to this
 284  *       rule are noted in the comments.
 285  */
 286
 287 /*
 288  * Skip the scsi bus reset.  Non 0 make us skip the reset at startup.  This
 289  * has no effect on any later resets that might occur due to things like
 290  * SCSI bus timeouts.
 291  */
 292 static uint32_t aic7xxx_no_reset;
 293
 294 /*
 295  * Certain PCI motherboards will scan PCI devices from highest to lowest,
 296  * others scan from lowest to highest, and they tend to do all kinds of
 297  * strange things when they come into contact with PCI bridge chips.  The
 298  * net result of all this is that the PCI card that is actually used to boot
 299  * the machine is very hard to detect.  Most motherboards go from lowest
 300  * PCI slot number to highest, and the first SCSI controller found is the
 301  * one you boot from.  The only exceptions to this are when a controller
 302  * has its BIOS disabled.  So, we by default sort all of our SCSI controllers
 303  * from lowest PCI slot number to highest PCI slot number.  We also force
 304  * all controllers with their BIOS disabled to the end of the list.  This
 305  * works on *almost* all computers.  Where it doesn't work, we have this
 306  * option.  Setting this option to non-0 will reverse the order of the sort
 307  * to highest first, then lowest, but will still leave cards with their BIOS
 308  * disabled at the very end.  That should fix everyone up unless there are
 309  * really strange cirumstances.
 310  */
 311 static uint32_t aic7xxx_reverse_scan;
 312
 313 /*
 314  * Should we force EXTENDED translation on a controller.
 315  *     0 == Use whatever is in the SEEPROM or default to off
 316  *     1 == Use whatever is in the SEEPROM or default to on
 317  */
 318 static uint32_t aic7xxx_extended;
 319
 320 /*
 321  * PCI bus parity checking of the Adaptec controllers.  This is somewhat
 322  * dubious at best.  To my knowledge, this option has never actually
 323  * solved a PCI parity problem, but on certain machines with broken PCI
 324  * chipset configurations where stray PCI transactions with bad parity are
 325  * the norm rather than the exception, the error messages can be overwelming.
 326  * It's included in the driver for completeness.
 327  *   0     = Shut off PCI parity check
 328  *   non-0 = reverse polarity pci parity checking
 329  */
 330 static uint32_t aic7xxx_pci_parity = ~0;
 331
 332 /*
 333  * There are lots of broken chipsets in the world.  Some of them will
 334  * violate the PCI spec when we issue byte sized memory writes to our
 335  * controller.  I/O mapped register access, if allowed by the given
 336  * platform, will work in almost all cases.
 337  */
 338 uint32_t aic7xxx_allow_memio = ~0;
 339
 340 /*
 341  * So that we can set how long each device is given as a selection timeout.
 342  * The table of values goes like this:
 343  *   0 - 256ms
 344  *   1 - 128ms
 345  *   2 - 64ms
 346  *   3 - 32ms
 347  * We default to 256ms because some older devices need a longer time
 348  * to respond to initial selection.
 349  */
 350 static uint32_t aic7xxx_seltime;
 351
 352 /*
 353  * Certain devices do not perform any aging on commands.  Should the
 354  * device be saturated by commands in one portion of the disk, it is
 355  * possible for transactions on far away sectors to never be serviced.
 356  * To handle these devices, we can periodically send an ordered tag to
 357  * force all outstanding transactions to be serviced prior to a new
 358  * transaction.
 359  */
 360 uint32_t aic7xxx_periodic_otag;
 361
 362 /*
 363  * Module information and settable options.
 364  */
 365 static char *aic7xxx = NULL;
 366
 367 MODULE_AUTHOR("Maintainer: Justin T. Gibbs <gibbs@scsiguy.com>");
 368 MODULE_DESCRIPTION("Adaptec Aic77XX/78XX SCSI Host Bus Adapter driver");
 369 MODULE_LICENSE("Dual BSD/GPL");
 370 MODULE_VERSION(AIC7XXX_DRIVER_VERSION);
 371 module_param(aic7xxx, charp, 0444);
 372 MODULE_PARM_DESC(aic7xxx,
 373 "period delimited, options string.\n"
 374 "       verbose                 Enable verbose/diagnostic logging\n"
 375 "       allow_memio             Allow device registers to be memory mapped\n"
 376 "       debug                   Bitmask of debug values to enable\n"
 377 "       no_probe                Toggle EISA/VLB controller probing\n"
 378 "       probe_eisa_vl           Toggle EISA/VLB controller probing\n"
 379 "       no_reset                Supress initial bus resets\n"
 380 "       extended                Enable extended geometry on all controllers\n"
 381 "       periodic_otag           Send an ordered tagged transaction\n"
 382 "                               periodically to prevent tag starvation.\n"
 383 "                               This may be required by some older disk\n"
 384 "                               drives or RAID arrays.\n"
 385 "       reverse_scan            Sort PCI devices highest Bus/Slot to lowest\n"
 386 "       tag_info:<tag_str>      Set per-target tag depth\n"
 387 "       global_tag_depth:<int>  Global tag depth for every target\n"
 388 "                               on every bus\n"
 389 "       seltime:<int>           Selection Timeout\n"
 390 "                               (0/256ms,1/128ms,2/64ms,3/32ms)\n"
 391 "\n"
 392 "       Sample /etc/modprobe.conf line:\n"
 393 "               Toggle EISA/VLB probing\n"
 394 "               Set tag depth on Controller 1/Target 1 to 10 tags\n"
 395 "               Shorten the selection timeout to 128ms\n"
 396 "\n"
 397 "       options aic7xxx 'aic7xxx=probe_eisa_vl.tag_info:{{}.{.10}}.seltime:1'\n"
 398 );
 399
 400 static void ahc_linux_handle_scsi_status(struct ahc_softc *,
 401                                          struct scsi_device *,
 402                                          struct scb *);
 403 static void ahc_linux_queue_cmd_complete(struct ahc_softc *ahc,
 404                                          struct scsi_cmnd *cmd);
 405 static void ahc_linux_sem_timeout(u_long arg);
 406 static void ahc_linux_freeze_simq(struct ahc_softc *ahc);
 407 static void ahc_linux_release_simq(u_long arg);
 408 static int  ahc_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag);
 409 static void ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc);
 410 static u_int ahc_linux_user_tagdepth(struct ahc_softc *ahc,
 411                                      struct ahc_devinfo *devinfo);
 412 static void ahc_linux_device_queue_depth(struct scsi_device *);
 413 static int ahc_linux_run_command(struct ahc_softc*,
 414                                  struct ahc_linux_device *,
 415                                  struct scsi_cmnd *);
 416 static void ahc_linux_setup_tag_info_global(char *p);
 417 static aic_option_callback_t ahc_linux_setup_tag_info;
 418 static int  aic7xxx_setup(char *s);
 419 static int  ahc_linux_next_unit(void);
 420
 421 /********************************* Inlines ************************************/
 422 static __inline void ahc_linux_unmap_scb(struct ahc_softc*, struct scb*);
 423
 424 static __inline int ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb,
 425                                       struct ahc_dma_seg *sg,
 426                                       dma_addr_t addr, bus_size_t len);
 427
 428 static __inline void
 429 ahc_linux_unmap_scb(struct ahc_softc *ahc, struct scb *scb)
 430 {
 431         struct scsi_cmnd *cmd;
 432
 433         cmd = scb->io_ctx;
 434         ahc_sync_sglist(ahc, scb, BUS_DMASYNC_POSTWRITE);
 435         if (cmd->use_sg != 0) {
 436                 struct scatterlist *sg;
 437
 438                 sg = (struct scatterlist *)cmd->request_buffer;
 439                 pci_unmap_sg(ahc->dev_softc, sg, cmd->use_sg,
 440                              cmd->sc_data_direction);
 441         } else if (cmd->request_bufflen != 0) {
 442                 pci_unmap_single(ahc->dev_softc,
 443                                  scb->platform_data->buf_busaddr,
 444                                  cmd->request_bufflen,
 445                                  cmd->sc_data_direction);
 446         }
 447 }
 448
 449 static __inline int
 450 ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb,
 451                   struct ahc_dma_seg *sg, dma_addr_t addr, bus_size_t len)
 452 {
 453         int      consumed;
 454
 455         if ((scb->sg_count + 1) > AHC_NSEG)
 456                 panic("Too few segs for dma mapping.  "
 457                       "Increase AHC_NSEG\n");
 458
 459         consumed = 1;
 460         sg->addr = ahc_htole32(addr & 0xFFFFFFFF);
 461         scb->platform_data->xfer_len += len;
 462
 463         if (sizeof(dma_addr_t) > 4
 464          && (ahc->flags & AHC_39BIT_ADDRESSING) != 0)
 465                 len |= (addr >> 8) & AHC_SG_HIGH_ADDR_MASK;
 466
 467         sg->len = ahc_htole32(len);
 468         return (consumed);
 469 }
 470
 471 /*
 472  * Return a string describing the driver.
 473  */
 474 static const char *
 475 ahc_linux_info(struct Scsi_Host *host)
 476 {
 477         static char buffer[512];
 478         char    ahc_info[256];
 479         char   *bp;
 480         struct ahc_softc *ahc;
 481
 482         bp = &buffer[0];
 483         ahc = *(struct ahc_softc **)host->hostdata;
 484         memset(bp, 0, sizeof(buffer));
 485         strcpy(bp, "Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev ");
 486         strcat(bp, AIC7XXX_DRIVER_VERSION);
 487         strcat(bp, "\n");
 488         strcat(bp, "        <");
 489         strcat(bp, ahc->description);
 490         strcat(bp, ">\n");
 491         strcat(bp, "        ");
 492         ahc_controller_info(ahc, ahc_info);
 493         strcat(bp, ahc_info);
 494         strcat(bp, "\n");
 495
 496         return (bp);
 497 }
 498
 499 /*
 500  * Queue an SCB to the controller.
 501  */
 502 static int
 503 ahc_linux_queue(struct scsi_cmnd * cmd, void (*scsi_done) (struct scsi_cmnd *))
 504 {
 505         struct   ahc_softc *ahc;
 506         struct   ahc_linux_device *dev = scsi_transport_device_data(cmd->device);
 507
 508         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
 509
 510         /*
 511          * Save the callback on completion function.
 512          */
 513         cmd->scsi_done = scsi_done;
 514
 515         /*
 516          * Close the race of a command that was in the process of
 517          * being queued to us just as our simq was frozen.  Let
 518          * DV commands through so long as we are only frozen to
 519          * perform DV.
 520          */
 521         if (ahc->platform_data->qfrozen != 0)
 522                 return SCSI_MLQUEUE_HOST_BUSY;
 523
 524         cmd->result = CAM_REQ_INPROG << 16;
 525
 526         return ahc_linux_run_command(ahc, dev, cmd);
 527 }
 528
 529 static inline struct scsi_target **
 530 ahc_linux_target_in_softc(struct scsi_target *starget)
 531 {
 532         struct  ahc_softc *ahc =
 533                 *((struct ahc_softc **)dev_to_shost(&starget->dev)->hostdata);
 534         unsigned int target_offset;
 535
 536         target_offset = starget->id;
 537         if (starget->channel != 0)
 538                 target_offset += 8;
 539
 540         return &ahc->platform_data->starget[target_offset];
 541 }
 542
 543 static int
 544 ahc_linux_target_alloc(struct scsi_target *starget)
 545 {
 546         struct  ahc_softc *ahc =
 547                 *((struct ahc_softc **)dev_to_shost(&starget->dev)->hostdata);
 548         struct seeprom_config *sc = ahc->seep_config;
 549         unsigned long flags;
 550         struct scsi_target **ahc_targp = ahc_linux_target_in_softc(starget);
 551         struct ahc_linux_target *targ = scsi_transport_target_data(starget);
 552         unsigned short scsirate;
 553         struct ahc_devinfo devinfo;
 554         struct ahc_initiator_tinfo *tinfo;
 555         struct ahc_tmode_tstate *tstate;
 556         char channel = starget->channel + 'A';
 557         unsigned int our_id = ahc->our_id;
 558         unsigned int target_offset;
 559
 560         target_offset = starget->id;
 561         if (starget->channel != 0)
 562                 target_offset += 8;
 563
 564         if (starget->channel)
 565                 our_id = ahc->our_id_b;
 566
 567         ahc_lock(ahc, &flags);
 568
 569         BUG_ON(*ahc_targp != NULL);
 570
 571         *ahc_targp = starget;
 572         memset(targ, 0, sizeof(*targ));
 573
 574         if (sc) {
 575                 int maxsync = AHC_SYNCRATE_DT;
 576                 int ultra = 0;
 577                 int flags = sc->device_flags[target_offset];
 578
 579                 if (ahc->flags & AHC_NEWEEPROM_FMT) {
 580                     if (flags & CFSYNCHISULTRA)
 581                         ultra = 1;
 582                 } else if (flags & CFULTRAEN)
 583                         ultra = 1;
 584                 /* AIC nutcase; 10MHz appears as ultra = 1, CFXFER = 0x04
 585                  * change it to ultra=0, CFXFER = 0 */
 586                 if(ultra && (flags & CFXFER) == 0x04) {
 587                         ultra = 0;
 588                         flags &= ~CFXFER;
 589                 }
 590
 591                 if ((ahc->features & AHC_ULTRA2) != 0) {
 592                         scsirate = (flags & CFXFER) | (ultra ? 0x8 : 0);
 593                 } else {
 594                         scsirate = (flags & CFXFER) << 4;
 595                         maxsync = ultra ? AHC_SYNCRATE_ULTRA :
 596                                 AHC_SYNCRATE_FAST;
 597                 }
 598                 spi_max_width(starget) = (flags & CFWIDEB) ? 1 : 0;
 599                 if (!(flags & CFSYNCH))
 600                         spi_max_offset(starget) = 0;
 601                 spi_min_period(starget) =
 602                         ahc_find_period(ahc, scsirate, maxsync);
 603
 604                 tinfo = ahc_fetch_transinfo(ahc, channel, ahc->our_id,
 605                                             starget->id, &tstate);
 606         }
 607         ahc_compile_devinfo(&devinfo, our_id, starget->id,
 608                             CAM_LUN_WILDCARD, channel,
 609                             ROLE_INITIATOR);
 610         ahc_set_syncrate(ahc, &devinfo, NULL, 0, 0, 0,
 611                          AHC_TRANS_GOAL, /*paused*/FALSE);
 612         ahc_set_width(ahc, &devinfo, MSG_EXT_WDTR_BUS_8_BIT,
 613                       AHC_TRANS_GOAL, /*paused*/FALSE);
 614         ahc_unlock(ahc, &flags);
 615
 616         return 0;
 617 }
 618
 619 static void
 620 ahc_linux_target_destroy(struct scsi_target *starget)
 621 {
 622         struct scsi_target **ahc_targp = ahc_linux_target_in_softc(starget);
 623
 624         *ahc_targp = NULL;
 625 }
 626
 627 static int
 628 ahc_linux_slave_alloc(struct scsi_device *sdev)
 629 {
 630         struct  ahc_softc *ahc =
 631                 *((struct ahc_softc **)sdev->host->hostdata);
 632         struct scsi_target *starget = sdev->sdev_target;
 633         struct ahc_linux_target *targ = scsi_transport_target_data(starget);
 634         struct ahc_linux_device *dev;
 635
 636         if (bootverbose)
 637                 printf("%s: Slave Alloc %d\n", ahc_name(ahc), sdev->id);
 638
 639         BUG_ON(targ->sdev[sdev->lun] != NULL);
 640
 641         dev = scsi_transport_device_data(sdev);
 642         memset(dev, 0, sizeof(*dev));
 643
 644         /*
 645          * We start out life using untagged
 646          * transactions of which we allow one.
 647          */
 648         dev->openings = 1;
 649
 650         /*
 651          * Set maxtags to 0.  This will be changed if we
 652          * later determine that we are dealing with
 653          * a tagged queuing capable device.
 654          */
 655         dev->maxtags = 0;
 656
 657         targ->sdev[sdev->lun] = sdev;
 658
 659         return 0;
 660 }
 661
 662 static int
 663 ahc_linux_slave_configure(struct scsi_device *sdev)
 664 {
 665         struct  ahc_softc *ahc;
 666
 667         ahc = *((struct ahc_softc **)sdev->host->hostdata);
 668
 669         if (bootverbose)
 670                 printf("%s: Slave Configure %d\n", ahc_name(ahc), sdev->id);
 671
 672         ahc_linux_device_queue_depth(sdev);
 673
 674         /* Initial Domain Validation */
 675         if (!spi_initial_dv(sdev->sdev_target))
 676                 spi_dv_device(sdev);
 677
 678         return 0;
 679 }
 680
 681 static void
 682 ahc_linux_slave_destroy(struct scsi_device *sdev)
 683 {
 684         struct  ahc_softc *ahc;
 685         struct  ahc_linux_device *dev = scsi_transport_device_data(sdev);
 686         struct  ahc_linux_target *targ = scsi_transport_target_data(sdev->sdev_target);
 687
 688         ahc = *((struct ahc_softc **)sdev->host->hostdata);
 689         if (bootverbose)
 690                 printf("%s: Slave Destroy %d\n", ahc_name(ahc), sdev->id);
 691
 692         BUG_ON(dev->active);
 693
 694         targ->sdev[sdev->lun] = NULL;
 695 }
 696
 697 #if defined(__i386__)
 698 /*
 699  * Return the disk geometry for the given SCSI device.
 700  */
 701 static int
 702 ahc_linux_biosparam(struct scsi_device *sdev, struct block_device *bdev,
 703                     sector_t capacity, int geom[])
 704 {
 705         uint8_t *bh;
 706         int      heads;
 707         int      sectors;
 708         int      cylinders;
 709         int      ret;
 710         int      extended;
 711         struct   ahc_softc *ahc;
 712         u_int    channel;
 713
 714         ahc = *((struct ahc_softc **)sdev->host->hostdata);
 715         channel = sdev->channel;
 716
 717         bh = scsi_bios_ptable(bdev);
 718         if (bh) {
 719                 ret = scsi_partsize(bh, capacity,
 720                                     &geom[2], &geom[0], &geom[1]);
 721                 kfree(bh);
 722                 if (ret != -1)
 723                         return (ret);
 724         }
 725         heads = 64;
 726         sectors = 32;
 727         cylinders = aic_sector_div(capacity, heads, sectors);
 728
 729         if (aic7xxx_extended != 0)
 730                 extended = 1;
 731         else if (channel == 0)
 732                 extended = (ahc->flags & AHC_EXTENDED_TRANS_A) != 0;
 733         else
 734                 extended = (ahc->flags & AHC_EXTENDED_TRANS_B) != 0;
 735         if (extended && cylinders >= 1024) {
 736                 heads = 255;
 737                 sectors = 63;
 738                 cylinders = aic_sector_div(capacity, heads, sectors);
 739         }
 740         geom[0] = heads;
 741         geom[1] = sectors;
 742         geom[2] = cylinders;
 743         return (0);
 744 }
 745 #endif
 746
 747 /*
 748  * Abort the current SCSI command(s).
 749  */
 750 static int
 751 ahc_linux_abort(struct scsi_cmnd *cmd)
 752 {
 753         int error;
 754
 755         error = ahc_linux_queue_recovery_cmd(cmd, SCB_ABORT);
 756         if (error != 0)
 757                 printf("aic7xxx_abort returns 0x%x\n", error);
 758         return (error);
 759 }
 760
 761 /*
 762  * Attempt to send a target reset message to the device that timed out.
 763  */
 764 static int
 765 ahc_linux_dev_reset(struct scsi_cmnd *cmd)
 766 {
 767         int error;
 768
 769         error = ahc_linux_queue_recovery_cmd(cmd, SCB_DEVICE_RESET);
 770         if (error != 0)
 771                 printf("aic7xxx_dev_reset returns 0x%x\n", error);
 772         return (error);
 773 }
 774
 775 /*
 776  * Reset the SCSI bus.
 777  */
 778 static int
 779 ahc_linux_bus_reset(struct scsi_cmnd *cmd)
 780 {
 781         struct ahc_softc *ahc;
 782         int    found;
 783         unsigned long flags;
 784
 785         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
 786
 787         ahc_lock(ahc, &flags);
 788         found = ahc_reset_channel(ahc, cmd->device->channel + 'A',
 789                                   /*initiate reset*/TRUE);
 790         ahc_unlock(ahc, &flags);
 791
 792         if (bootverbose)
 793                 printf("%s: SCSI bus reset delivered. "
 794                        "%d SCBs aborted.\n", ahc_name(ahc), found);
 795
 796         return SUCCESS;
 797 }
 798
 799 struct scsi_host_template aic7xxx_driver_template = {
 800         .module                 = THIS_MODULE,
 801         .name                   = "aic7xxx",
 802         .proc_name              = "aic7xxx",
 803         .proc_info              = ahc_linux_proc_info,
 804         .info                   = ahc_linux_info,
 805         .queuecommand           = ahc_linux_queue,
 806         .eh_abort_handler       = ahc_linux_abort,
 807         .eh_device_reset_handler = ahc_linux_dev_reset,
 808         .eh_bus_reset_handler   = ahc_linux_bus_reset,
 809 #if defined(__i386__)
 810         .bios_param             = ahc_linux_biosparam,
 811 #endif
 812         .can_queue              = AHC_MAX_QUEUE,
 813         .this_id                = -1,
 814         .cmd_per_lun            = 2,
 815         .use_clustering         = ENABLE_CLUSTERING,
 816         .slave_alloc            = ahc_linux_slave_alloc,
 817         .slave_configure        = ahc_linux_slave_configure,
 818         .slave_destroy          = ahc_linux_slave_destroy,
 819         .target_alloc           = ahc_linux_target_alloc,
 820         .target_destroy         = ahc_linux_target_destroy,
 821 };
 822
 823 /**************************** Tasklet Handler *********************************/
 824
 825 /******************************** Macros **************************************/
 826 #define BUILD_SCSIID(ahc, cmd)                                              \
 827         ((((cmd)->device->id << TID_SHIFT) & TID)                           \
 828         | (((cmd)->device->channel == 0) ? (ahc)->our_id : (ahc)->our_id_b) \
 829         | (((cmd)->device->channel == 0) ? 0 : TWIN_CHNLB))
 830
 831 /******************************** Bus DMA *************************************/
 832 int
 833 ahc_dma_tag_create(struct ahc_softc *ahc, bus_dma_tag_t parent,
 834                    bus_size_t alignment, bus_size_t boundary,
 835                    dma_addr_t lowaddr, dma_addr_t highaddr,
 836                    bus_dma_filter_t *filter, void *filterarg,
 837                    bus_size_t maxsize, int nsegments,
 838                    bus_size_t maxsegsz, int flags, bus_dma_tag_t *ret_tag)
 839 {
 840         bus_dma_tag_t dmat;
 841
 842         dmat = malloc(sizeof(*dmat), M_DEVBUF, M_NOWAIT);
 843         if (dmat == NULL)
 844                 return (ENOMEM);
 845
 846         /*
 847          * Linux is very simplistic about DMA memory.  For now don't
 848          * maintain all specification information.  Once Linux supplies
 849          * better facilities for doing these operations, or the
 850          * needs of this particular driver change, we might need to do
 851          * more here.
 852          */
 853         dmat->alignment = alignment;
 854         dmat->boundary = boundary;
 855         dmat->maxsize = maxsize;
 856         *ret_tag = dmat;
 857         return (0);
 858 }
 859
 860 void
 861 ahc_dma_tag_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat)
 862 {
 863         free(dmat, M_DEVBUF);
 864 }
 865
 866 int
 867 ahc_dmamem_alloc(struct ahc_softc *ahc, bus_dma_tag_t dmat, void** vaddr,
 868                  int flags, bus_dmamap_t *mapp)
 869 {
 870         *vaddr = pci_alloc_consistent(ahc->dev_softc,
 871                                       dmat->maxsize, mapp);
 872         if (*vaddr == NULL)
 873                 return ENOMEM;
 874         return 0;
 875 }
 876
 877 void
 878 ahc_dmamem_free(struct ahc_softc *ahc, bus_dma_tag_t dmat,
 879                 void* vaddr, bus_dmamap_t map)
 880 {
 881         pci_free_consistent(ahc->dev_softc, dmat->maxsize,
 882                             vaddr, map);
 883 }
 884
 885 int
 886 ahc_dmamap_load(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map,
 887                 void *buf, bus_size_t buflen, bus_dmamap_callback_t *cb,
 888                 void *cb_arg, int flags)
 889 {
 890         /*
 891          * Assume for now that this will only be used during
 892          * initialization and not for per-transaction buffer mapping.
 893          */
 894         bus_dma_segment_t stack_sg;
 895
 896         stack_sg.ds_addr = map;
 897         stack_sg.ds_len = dmat->maxsize;
 898         cb(cb_arg, &stack_sg, /*nseg*/1, /*error*/0);
 899         return (0);
 900 }
 901
 902 void
 903 ahc_dmamap_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
 904 {
 905 }
 906
 907 int
 908 ahc_dmamap_unload(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
 909 {
 910         /* Nothing to do */
 911         return (0);
 912 }
 913
 914 /********************* Platform Dependent Functions ***************************/
 915 /*
 916  * Compare "left hand" softc with "right hand" softc, returning:
 917  * < 0 - lahc has a lower priority than rahc
 918  *   0 - Softcs are equal
 919  * > 0 - lahc has a higher priority than rahc
 920  */
 921 int
 922 ahc_softc_comp(struct ahc_softc *lahc, struct ahc_softc *rahc)
 923 {
 924         int     value;
 925         int     rvalue;
 926         int     lvalue;
 927
 928         /*
 929          * Under Linux, cards are ordered as follows:
 930          *      1) VLB/EISA BIOS enabled devices sorted by BIOS address.
 931          *      2) PCI devices with BIOS enabled sorted by bus/slot/func.
 932          *      3) All remaining VLB/EISA devices sorted by ioport.
 933          *      4) All remaining PCI devices sorted by bus/slot/func.
 934          */
 935         value = (lahc->flags & AHC_BIOS_ENABLED)
 936               - (rahc->flags & AHC_BIOS_ENABLED);
 937         if (value != 0)
 938                 /* Controllers with BIOS enabled have a *higher* priority */
 939                 return (value);
 940
 941         /*
 942          * Same BIOS setting, now sort based on bus type.
 943          * EISA and VL controllers sort together.  EISA/VL
 944          * have higher priority than PCI.
 945          */
 946         rvalue = (rahc->chip & AHC_BUS_MASK);
 947         if (rvalue == AHC_VL)
 948                 rvalue = AHC_EISA;
 949         lvalue = (lahc->chip & AHC_BUS_MASK);
 950         if (lvalue == AHC_VL)
 951                 lvalue = AHC_EISA;
 952         value = rvalue - lvalue;
 953         if (value != 0)
 954                 return (value);
 955
 956         /* Still equal.  Sort by BIOS address, ioport, or bus/slot/func. */
 957         switch (rvalue) {
 958 #ifdef CONFIG_PCI
 959         case AHC_PCI:
 960         {
 961                 char primary_channel;
 962
 963                 if (aic7xxx_reverse_scan != 0)
 964                         value = ahc_get_pci_bus(lahc->dev_softc)
 965                               - ahc_get_pci_bus(rahc->dev_softc);
 966                 else
 967                         value = ahc_get_pci_bus(rahc->dev_softc)
 968                               - ahc_get_pci_bus(lahc->dev_softc);
 969                 if (value != 0)
 970                         break;
 971                 if (aic7xxx_reverse_scan != 0)
 972                         value = ahc_get_pci_slot(lahc->dev_softc)
 973                               - ahc_get_pci_slot(rahc->dev_softc);
 974                 else
 975                         value = ahc_get_pci_slot(rahc->dev_softc)
 976                               - ahc_get_pci_slot(lahc->dev_softc);
 977                 if (value != 0)
 978                         break;
 979                 /*
 980                  * On multi-function devices, the user can choose
 981                  * to have function 1 probed before function 0.
 982                  * Give whichever channel is the primary channel
 983                  * the highest priority.
 984                  */
 985                 primary_channel = (lahc->flags & AHC_PRIMARY_CHANNEL) + 'A';
 986                 value = -1;
 987                 if (lahc->channel == primary_channel)
 988                         value = 1;
 989                 break;
 990         }
 991 #endif
 992         case AHC_EISA:
 993                 if ((rahc->flags & AHC_BIOS_ENABLED) != 0) {
 994                         value = rahc->platform_data->bios_address
 995                               - lahc->platform_data->bios_address;
 996                 } else {
 997                         value = rahc->bsh.ioport
 998                               - lahc->bsh.ioport;
 999                 }
1000                 break;
1001         default:
1002                 panic("ahc_softc_sort: invalid bus type");
1003         }
1004         return (value);
1005 }
1006
1007 static void
1008 ahc_linux_setup_tag_info_global(char *p)
1009 {
1010         int tags, i, j;
1011
1012         tags = simple_strtoul(p + 1, NULL, 0) & 0xff;
1013         printf("Setting Global Tags= %d\n", tags);
1014
1015         for (i = 0; i < NUM_ELEMENTS(aic7xxx_tag_info); i++) {
1016                 for (j = 0; j < AHC_NUM_TARGETS; j++) {
1017                         aic7xxx_tag_info[i].tag_commands[j] = tags;
1018                 }
1019         }
1020 }
1021
1022 static void
1023 ahc_linux_setup_tag_info(u_long arg, int instance, int targ, int32_t value)
1024 {
1025
1026         if ((instance >= 0) && (targ >= 0)
1027          && (instance < NUM_ELEMENTS(aic7xxx_tag_info))
1028          && (targ < AHC_NUM_TARGETS)) {
1029                 aic7xxx_tag_info[instance].tag_commands[targ] = value & 0xff;
1030                 if (bootverbose)
1031                         printf("tag_info[%d:%d] = %d\n", instance, targ, value);
1032         }
1033 }
1034
1035 /*
1036  * Handle Linux boot parameters. This routine allows for assigning a value
1037  * to a parameter with a ':' between the parameter and the value.
1038  * ie. aic7xxx=stpwlev:1,extended
1039  */
1040 static int
1041 aic7xxx_setup(char *s)
1042 {
1043         int     i, n;
1044         char   *p;
1045         char   *end;
1046
1047         static struct {
1048                 const char *name;
1049                 uint32_t *flag;
1050         } options[] = {
1051                 { "extended", &aic7xxx_extended },
1052                 { "no_reset", &aic7xxx_no_reset },
1053                 { "verbose", &aic7xxx_verbose },
1054                 { "allow_memio", &aic7xxx_allow_memio},
1055 #ifdef AHC_DEBUG
1056                 { "debug", &ahc_debug },
1057 #endif
1058                 { "reverse_scan", &aic7xxx_reverse_scan },
1059                 { "periodic_otag", &aic7xxx_periodic_otag },
1060                 { "pci_parity", &aic7xxx_pci_parity },
1061                 { "seltime", &aic7xxx_seltime },
1062                 { "tag_info", NULL },
1063                 { "global_tag_depth", NULL },
1064                 { "dv", NULL }
1065         };
1066
1067         end = strchr(s, '\0');
1068
1069         /*
1070          * XXX ia64 gcc isn't smart enough to know that NUM_ELEMENTS
1071          * will never be 0 in this case.
1072          */
1073         n = 0;
1074
1075         while ((p = strsep(&s, ",.")) != NULL) {
1076                 if (*p == '\0')
1077                         continue;
1078                 for (i = 0; i < NUM_ELEMENTS(options); i++) {
1079
1080                         n = strlen(options[i].name);
1081                         if (strncmp(options[i].name, p, n) == 0)
1082                                 break;
1083                 }
1084                 if (i == NUM_ELEMENTS(options))
1085                         continue;
1086
1087                 if (strncmp(p, "global_tag_depth", n) == 0) {
1088                         ahc_linux_setup_tag_info_global(p + n);
1089                 } else if (strncmp(p, "tag_info", n) == 0) {
1090                         s = aic_parse_brace_option("tag_info", p + n, end,
1091                             2, ahc_linux_setup_tag_info, 0);
1092                 } else if (p[n] == ':') {
1093                         *(options[i].flag) = simple_strtoul(p + n + 1, NULL, 0);
1094                 } else if (strncmp(p, "verbose", n) == 0) {
1095                         *(options[i].flag) = 1;
1096                 } else {
1097                         *(options[i].flag) ^= 0xFFFFFFFF;
1098                 }
1099         }
1100         return 1;
1101 }
1102
1103 __setup("aic7xxx=", aic7xxx_setup);
1104
1105 uint32_t aic7xxx_verbose;
1106
1107 int
1108 ahc_linux_register_host(struct ahc_softc *ahc, struct scsi_host_template *template)
1109 {
1110         char     buf[80];
1111         struct   Scsi_Host *host;
1112         char    *new_name;
1113         u_long   s;
1114
1115         template->name = ahc->description;
1116         host = scsi_host_alloc(template, sizeof(struct ahc_softc *));
1117         if (host == NULL)
1118                 return (ENOMEM);
1119
1120         *((struct ahc_softc **)host->hostdata) = ahc;
1121         ahc_lock(ahc, &s);
1122         scsi_assign_lock(host, &ahc->platform_data->spin_lock);
1123         ahc->platform_data->host = host;
1124         host->can_queue = AHC_MAX_QUEUE;
1125         host->cmd_per_lun = 2;
1126         /* XXX No way to communicate the ID for multiple channels */
1127         host->this_id = ahc->our_id;
1128         host->irq = ahc->platform_data->irq;
1129         host->max_id = (ahc->features & AHC_WIDE) ? 16 : 8;
1130         host->max_lun = AHC_NUM_LUNS;
1131         host->max_channel = (ahc->features & AHC_TWIN) ? 1 : 0;
1132         host->sg_tablesize = AHC_NSEG;
1133         ahc_set_unit(ahc, ahc_linux_next_unit());
1134         sprintf(buf, "scsi%d", host->host_no);
1135         new_name = malloc(strlen(buf) + 1, M_DEVBUF, M_NOWAIT);
1136         if (new_name != NULL) {
1137                 strcpy(new_name, buf);
1138                 ahc_set_name(ahc, new_name);
1139         }
1140         host->unique_id = ahc->unit;
1141         ahc_linux_initialize_scsi_bus(ahc);
1142         ahc_intr_enable(ahc, TRUE);
1143         ahc_unlock(ahc, &s);
1144
1145         host->transportt = ahc_linux_transport_template;
1146
1147         scsi_add_host(host, (ahc->dev_softc ? &ahc->dev_softc->dev : NULL)); /* XXX handle failure */
1148         scsi_scan_host(host);
1149         return (0);
1150 }
1151
1152 uint64_t
1153 ahc_linux_get_memsize(void)
1154 {
1155         struct sysinfo si;
1156
1157         si_meminfo(&si);
1158         return ((uint64_t)si.totalram << PAGE_SHIFT);
1159 }
1160
1161 /*
1162  * Find the smallest available unit number to use
1163  * for a new device.  We don't just use a static
1164  * count to handle the "repeated hot-(un)plug"
1165  * scenario.
1166  */
1167 static int
1168 ahc_linux_next_unit(void)
1169 {
1170         struct ahc_softc *ahc;
1171         int unit;
1172
1173         unit = 0;
1174 retry:
1175         TAILQ_FOREACH(ahc, &ahc_tailq, links) {
1176                 if (ahc->unit == unit) {
1177                         unit++;
1178                         goto retry;
1179                 }
1180         }
1181         return (unit);
1182 }
1183
1184 /*
1185  * Place the SCSI bus into a known state by either resetting it,
1186  * or forcing transfer negotiations on the next command to any
1187  * target.
1188  */
1189 void
1190 ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc)
1191 {
1192         int i;
1193         int numtarg;
1194
1195         i = 0;
1196         numtarg = 0;
1197
1198         if (aic7xxx_no_reset != 0)
1199                 ahc->flags &= ~(AHC_RESET_BUS_A|AHC_RESET_BUS_B);
1200
1201         if ((ahc->flags & AHC_RESET_BUS_A) != 0)
1202                 ahc_reset_channel(ahc, 'A', /*initiate_reset*/TRUE);
1203         else
1204                 numtarg = (ahc->features & AHC_WIDE) ? 16 : 8;
1205
1206         if ((ahc->features & AHC_TWIN) != 0) {
1207
1208                 if ((ahc->flags & AHC_RESET_BUS_B) != 0) {
1209                         ahc_reset_channel(ahc, 'B', /*initiate_reset*/TRUE);
1210                 } else {
1211                         if (numtarg == 0)
1212                                 i = 8;
1213                         numtarg += 8;
1214                 }
1215         }
1216
1217         /*
1218          * Force negotiation to async for all targets that
1219          * will not see an initial bus reset.
1220          */
1221         for (; i < numtarg; i++) {
1222                 struct ahc_devinfo devinfo;
1223                 struct ahc_initiator_tinfo *tinfo;
1224                 struct ahc_tmode_tstate *tstate;
1225                 u_int our_id;
1226                 u_int target_id;
1227                 char channel;
1228
1229                 channel = 'A';
1230                 our_id = ahc->our_id;
1231                 target_id = i;
1232                 if (i > 7 && (ahc->features & AHC_TWIN) != 0) {
1233                         channel = 'B';
1234                         our_id = ahc->our_id_b;
1235                         target_id = i % 8;
1236                 }
1237                 tinfo = ahc_fetch_transinfo(ahc, channel, our_id,
1238                                             target_id, &tstate);
1239                 ahc_compile_devinfo(&devinfo, our_id, target_id,
1240                                     CAM_LUN_WILDCARD, channel, ROLE_INITIATOR);
1241                 ahc_update_neg_request(ahc, &devinfo, tstate,
1242                                        tinfo, AHC_NEG_ALWAYS);
1243         }
1244         /* Give the bus some time to recover */
1245         if ((ahc->flags & (AHC_RESET_BUS_A|AHC_RESET_BUS_B)) != 0) {
1246                 ahc_linux_freeze_simq(ahc);
1247                 init_timer(&ahc->platform_data->reset_timer);
1248                 ahc->platform_data->reset_timer.data = (u_long)ahc;
1249                 ahc->platform_data->reset_timer.expires =
1250                     jiffies + (AIC7XXX_RESET_DELAY * HZ)/1000;
1251                 ahc->platform_data->reset_timer.function =
1252                     ahc_linux_release_simq;
1253                 add_timer(&ahc->platform_data->reset_timer);
1254         }
1255 }
1256
1257 int
1258 ahc_platform_alloc(struct ahc_softc *ahc, void *platform_arg)
1259 {
1260
1261         ahc->platform_data =
1262             malloc(sizeof(struct ahc_platform_data), M_DEVBUF, M_NOWAIT);
1263         if (ahc->platform_data == NULL)
1264                 return (ENOMEM);
1265         memset(ahc->platform_data, 0, sizeof(struct ahc_platform_data));
1266         ahc->platform_data->irq = AHC_LINUX_NOIRQ;
1267         ahc_lockinit(ahc);
1268         init_MUTEX_LOCKED(&ahc->platform_data->eh_sem);
1269         ahc->seltime = (aic7xxx_seltime & 0x3) << 4;
1270         ahc->seltime_b = (aic7xxx_seltime & 0x3) << 4;
1271         if (aic7xxx_pci_parity == 0)
1272                 ahc->flags |= AHC_DISABLE_PCI_PERR;
1273
1274         return (0);
1275 }
1276
1277 void
1278 ahc_platform_free(struct ahc_softc *ahc)
1279 {
1280         struct scsi_target *starget;
1281         int i, j;
1282
1283         if (ahc->platform_data != NULL) {
1284                 if (ahc->platform_data->host != NULL) {
1285                         scsi_remove_host(ahc->platform_data->host);
1286                         scsi_host_put(ahc->platform_data->host);
1287                 }
1288
1289                 /* destroy all of the device and target objects */
1290                 for (i = 0; i < AHC_NUM_TARGETS; i++) {
1291                         starget = ahc->platform_data->starget[i];
1292                         if (starget != NULL) {
1293                                 for (j = 0; j < AHC_NUM_LUNS; j++) {
1294                                         struct ahc_linux_target *targ =
1295                                                 scsi_transport_target_data(starget);
1296
1297                                         if (targ->sdev[j] == NULL)
1298                                                 continue;
1299                                         targ->sdev[j] = NULL;
1300                                 }
1301                                 ahc->platform_data->starget[i] = NULL;
1302                         }
1303                 }
1304
1305                 if (ahc->platform_data->irq != AHC_LINUX_NOIRQ)
1306                         free_irq(ahc->platform_data->irq, ahc);
1307                 if (ahc->tag == BUS_SPACE_PIO
1308                  && ahc->bsh.ioport != 0)
1309                         release_region(ahc->bsh.ioport, 256);
1310                 if (ahc->tag == BUS_SPACE_MEMIO
1311                  && ahc->bsh.maddr != NULL) {
1312                         iounmap(ahc->bsh.maddr);
1313                         release_mem_region(ahc->platform_data->mem_busaddr,
1314                                            0x1000);
1315                 }
1316
1317                 free(ahc->platform_data, M_DEVBUF);
1318         }
1319 }
1320
1321 void
1322 ahc_platform_freeze_devq(struct ahc_softc *ahc, struct scb *scb)
1323 {
1324         ahc_platform_abort_scbs(ahc, SCB_GET_TARGET(ahc, scb),
1325                                 SCB_GET_CHANNEL(ahc, scb),
1326                                 SCB_GET_LUN(scb), SCB_LIST_NULL,
1327                                 ROLE_UNKNOWN, CAM_REQUEUE_REQ);
1328 }
1329
1330 void
1331 ahc_platform_set_tags(struct ahc_softc *ahc, struct ahc_devinfo *devinfo,
1332                       ahc_queue_alg alg)
1333 {
1334         struct scsi_target *starget;
1335         struct ahc_linux_target *targ;
1336         struct ahc_linux_device *dev;
1337         struct scsi_device *sdev;
1338         u_int target_offset;
1339         int was_queuing;
1340         int now_queuing;
1341
1342         target_offset = devinfo->target;
1343         if (devinfo->channel != 'A')
1344                 target_offset += 8;
1345         starget = ahc->platform_data->starget[target_offset];
1346         targ = scsi_transport_target_data(starget);
1347         BUG_ON(targ == NULL);
1348         sdev = targ->sdev[devinfo->lun];
1349         if (sdev == NULL)
1350                 return;
1351         dev = scsi_transport_device_data(sdev);
1352
1353         was_queuing = dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED);
1354         switch (alg) {
1355         default:
1356         case AHC_QUEUE_NONE:
1357                 now_queuing = 0;
1358                 break;
1359         case AHC_QUEUE_BASIC:
1360                 now_queuing = AHC_DEV_Q_BASIC;
1361                 break;
1362         case AHC_QUEUE_TAGGED:
1363                 now_queuing = AHC_DEV_Q_TAGGED;
1364                 break;
1365         }
1366         if ((dev->flags & AHC_DEV_FREEZE_TIL_EMPTY) == 0
1367          && (was_queuing != now_queuing)
1368          && (dev->active != 0)) {
1369                 dev->flags |= AHC_DEV_FREEZE_TIL_EMPTY;
1370                 dev->qfrozen++;
1371         }
1372
1373         dev->flags &= ~(AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED|AHC_DEV_PERIODIC_OTAG);
1374         if (now_queuing) {
1375                 u_int usertags;
1376
1377                 usertags = ahc_linux_user_tagdepth(ahc, devinfo);
1378                 if (!was_queuing) {
1379                         /*
1380                          * Start out agressively and allow our
1381                          * dynamic queue depth algorithm to take
1382                          * care of the rest.
1383                          */
1384                         dev->maxtags = usertags;
1385                         dev->openings = dev->maxtags - dev->active;
1386                 }
1387                 if (dev->maxtags == 0) {
1388                         /*
1389                          * Queueing is disabled by the user.
1390                          */
1391                         dev->openings = 1;
1392                 } else if (alg == AHC_QUEUE_TAGGED) {
1393                         dev->flags |= AHC_DEV_Q_TAGGED;
1394                         if (aic7xxx_periodic_otag != 0)
1395                                 dev->flags |= AHC_DEV_PERIODIC_OTAG;
1396                 } else
1397                         dev->flags |= AHC_DEV_Q_BASIC;
1398         } else {
1399                 /* We can only have one opening. */
1400                 dev->maxtags = 0;
1401                 dev->openings =  1 - dev->active;
1402         }
1403         switch ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED))) {
1404         case AHC_DEV_Q_BASIC:
1405                 scsi_adjust_queue_depth(sdev,
1406                                         MSG_SIMPLE_TASK,
1407                                         dev->openings + dev->active);
1408                 break;
1409         case AHC_DEV_Q_TAGGED:
1410                 scsi_adjust_queue_depth(sdev,
1411                                         MSG_ORDERED_TASK,
1412                                         dev->openings + dev->active);
1413                 break;
1414         default:
1415                 /*
1416                  * We allow the OS to queue 2 untagged transactions to
1417                  * us at any time even though we can only execute them
1418                  * serially on the controller/device.  This should
1419                  * remove some latency.
1420                  */
1421                 scsi_adjust_queue_depth(sdev,
1422                                         /*NON-TAGGED*/0,
1423                                         /*queue depth*/2);
1424                 break;
1425         }
1426 }
1427
1428 int
1429 ahc_platform_abort_scbs(struct ahc_softc *ahc, int target, char channel,
1430                         int lun, u_int tag, role_t role, uint32_t status)
1431 {
1432         return 0;
1433 }
1434
1435 static u_int
1436 ahc_linux_user_tagdepth(struct ahc_softc *ahc, struct ahc_devinfo *devinfo)
1437 {
1438         static int warned_user;
1439         u_int tags;
1440
1441         tags = 0;
1442         if ((ahc->user_discenable & devinfo->target_mask) != 0) {
1443                 if (ahc->unit >= NUM_ELEMENTS(aic7xxx_tag_info)) {
1444                         if (warned_user == 0) {
1445
1446                                 printf(KERN_WARNING
1447 "aic7xxx: WARNING: Insufficient tag_info instances\n"
1448 "aic7xxx: for installed controllers. Using defaults\n"
1449 "aic7xxx: Please update the aic7xxx_tag_info array in\n"
1450 "aic7xxx: the aic7xxx_osm..c source file.\n");
1451                                 warned_user++;
1452                         }
1453                         tags = AHC_MAX_QUEUE;
1454                 } else {
1455                         adapter_tag_info_t *tag_info;
1456
1457                         tag_info = &aic7xxx_tag_info[ahc->unit];
1458                         tags = tag_info->tag_commands[devinfo->target_offset];
1459                         if (tags > AHC_MAX_QUEUE)
1460                                 tags = AHC_MAX_QUEUE;
1461                 }
1462         }
1463         return (tags);
1464 }
1465
1466 /*
1467  * Determines the queue depth for a given device.
1468  */
1469 static void
1470 ahc_linux_device_queue_depth(struct scsi_device *sdev)
1471 {
1472         struct  ahc_devinfo devinfo;
1473         u_int   tags;
1474         struct ahc_softc *ahc = *((struct ahc_softc **)sdev->host->hostdata);
1475
1476         ahc_compile_devinfo(&devinfo,
1477                             sdev->sdev_target->channel == 0
1478                           ? ahc->our_id : ahc->our_id_b,
1479                             sdev->sdev_target->id, sdev->lun,
1480                             sdev->sdev_target->channel == 0 ? 'A' : 'B',
1481                             ROLE_INITIATOR);
1482         tags = ahc_linux_user_tagdepth(ahc, &devinfo);
1483         if (tags != 0 && sdev->tagged_supported != 0) {
1484
1485                 ahc_set_tags(ahc, &devinfo, AHC_QUEUE_TAGGED);
1486                 ahc_print_devinfo(ahc, &devinfo);
1487                 printf("Tagged Queuing enabled.  Depth %d\n", tags);
1488         } else {
1489                 ahc_set_tags(ahc, &devinfo, AHC_QUEUE_NONE);
1490         }
1491 }
1492
1493 static int
1494 ahc_linux_run_command(struct ahc_softc *ahc, struct ahc_linux_device *dev,
1495                       struct scsi_cmnd *cmd)
1496 {
1497         struct   scb *scb;
1498         struct   hardware_scb *hscb;
1499         struct   ahc_initiator_tinfo *tinfo;
1500         struct   ahc_tmode_tstate *tstate;
1501         uint16_t mask;
1502         struct scb_tailq *untagged_q = NULL;
1503
1504         /*
1505          * Schedule us to run later.  The only reason we are not
1506          * running is because the whole controller Q is frozen.
1507          */
1508         if (ahc->platform_data->qfrozen != 0)
1509                 return SCSI_MLQUEUE_HOST_BUSY;
1510
1511         /*
1512          * We only allow one untagged transaction
1513          * per target in the initiator role unless
1514          * we are storing a full busy target *lun*
1515          * table in SCB space.
1516          */
1517         if (!blk_rq_tagged(cmd->request)
1518             && (ahc->features & AHC_SCB_BTT) == 0) {
1519                 int target_offset;
1520
1521                 target_offset = cmd->device->id + cmd->device->channel * 8;
1522                 untagged_q = &(ahc->untagged_queues[target_offset]);
1523                 if (!TAILQ_EMPTY(untagged_q))
1524                         /* if we're already executing an untagged command
1525                          * we're busy to another */
1526                         return SCSI_MLQUEUE_DEVICE_BUSY;
1527         }
1528
1529         /*
1530          * Get an scb to use.
1531          */
1532         scb = ahc_get_scb(ahc);
1533         if (!scb)
1534                 return SCSI_MLQUEUE_HOST_BUSY;
1535
1536         scb->io_ctx = cmd;
1537         scb->platform_data->dev = dev;
1538         hscb = scb->hscb;
1539         cmd->host_scribble = (char *)scb;
1540
1541         /*
1542          * Fill out basics of the HSCB.
1543          */
1544         hscb->control = 0;
1545         hscb->scsiid = BUILD_SCSIID(ahc, cmd);
1546         hscb->lun = cmd->device->lun;
1547         mask = SCB_GET_TARGET_MASK(ahc, scb);
1548         tinfo = ahc_fetch_transinfo(ahc, SCB_GET_CHANNEL(ahc, scb),
1549                                     SCB_GET_OUR_ID(scb),
1550                                     SCB_GET_TARGET(ahc, scb), &tstate);
1551         hscb->scsirate = tinfo->scsirate;
1552         hscb->scsioffset = tinfo->curr.offset;
1553         if ((tstate->ultraenb & mask) != 0)
1554                 hscb->control |= ULTRAENB;
1555
1556         if ((ahc->user_discenable & mask) != 0)
1557                 hscb->control |= DISCENB;
1558
1559         if ((tstate->auto_negotiate & mask) != 0) {
1560                 scb->flags |= SCB_AUTO_NEGOTIATE;
1561                 scb->hscb->control |= MK_MESSAGE;
1562         }
1563
1564         if ((dev->flags & (AHC_DEV_Q_TAGGED|AHC_DEV_Q_BASIC)) != 0) {
1565                 int     msg_bytes;
1566                 uint8_t tag_msgs[2];
1567
1568                 msg_bytes = scsi_populate_tag_msg(cmd, tag_msgs);
1569                 if (msg_bytes && tag_msgs[0] != MSG_SIMPLE_TASK) {
1570                         hscb->control |= tag_msgs[0];
1571                         if (tag_msgs[0] == MSG_ORDERED_TASK)
1572                                 dev->commands_since_idle_or_otag = 0;
1573                 } else if (dev->commands_since_idle_or_otag == AHC_OTAG_THRESH
1574                                 && (dev->flags & AHC_DEV_Q_TAGGED) != 0) {
1575                         hscb->control |= MSG_ORDERED_TASK;
1576                         dev->commands_since_idle_or_otag = 0;
1577                 } else {
1578                         hscb->control |= MSG_SIMPLE_TASK;
1579                 }
1580         }
1581
1582         hscb->cdb_len = cmd->cmd_len;
1583         if (hscb->cdb_len <= 12) {
1584                 memcpy(hscb->shared_data.cdb, cmd->cmnd, hscb->cdb_len);
1585         } else {
1586                 memcpy(hscb->cdb32, cmd->cmnd, hscb->cdb_len);
1587                 scb->flags |= SCB_CDB32_PTR;
1588         }
1589
1590         scb->platform_data->xfer_len = 0;
1591         ahc_set_residual(scb, 0);
1592         ahc_set_sense_residual(scb, 0);
1593         scb->sg_count = 0;
1594         if (cmd->use_sg != 0) {
1595                 struct  ahc_dma_seg *sg;
1596                 struct  scatterlist *cur_seg;
1597                 struct  scatterlist *end_seg;
1598                 int     nseg;
1599
1600                 cur_seg = (struct scatterlist *)cmd->request_buffer;
1601                 nseg = pci_map_sg(ahc->dev_softc, cur_seg, cmd->use_sg,
1602                                   cmd->sc_data_direction);
1603                 end_seg = cur_seg + nseg;
1604                 /* Copy the segments into the SG list. */
1605                 sg = scb->sg_list;
1606                 /*
1607                  * The sg_count may be larger than nseg if
1608                  * a transfer crosses a 32bit page.
1609                  */
1610                 while (cur_seg < end_seg) {
1611                         dma_addr_t addr;
1612                         bus_size_t len;
1613                         int consumed;
1614
1615                         addr = sg_dma_address(cur_seg);
1616                         len = sg_dma_len(cur_seg);
1617                         consumed = ahc_linux_map_seg(ahc, scb,
1618                                                      sg, addr, len);
1619                         sg += consumed;
1620                         scb->sg_count += consumed;
1621                         cur_seg++;
1622                 }
1623                 sg--;
1624                 sg->len |= ahc_htole32(AHC_DMA_LAST_SEG);
1625
1626                 /*
1627                  * Reset the sg list pointer.
1628                  */
1629                 scb->hscb->sgptr =
1630                         ahc_htole32(scb->sg_list_phys | SG_FULL_RESID);
1631
1632                 /*
1633                  * Copy the first SG into the "current"
1634                  * data pointer area.
1635                  */
1636                 scb->hscb->dataptr = scb->sg_list->addr;
1637                 scb->hscb->datacnt = scb->sg_list->len;
1638         } else if (cmd->request_bufflen != 0) {
1639                 struct   ahc_dma_seg *sg;
1640                 dma_addr_t addr;
1641
1642                 sg = scb->sg_list;
1643                 addr = pci_map_single(ahc->dev_softc,
1644                                       cmd->request_buffer,
1645                                       cmd->request_bufflen,
1646                                       cmd->sc_data_direction);
1647                 scb->platform_data->buf_busaddr = addr;
1648                 scb->sg_count = ahc_linux_map_seg(ahc, scb,
1649                                                   sg, addr,
1650                                                   cmd->request_bufflen);
1651                 sg->len |= ahc_htole32(AHC_DMA_LAST_SEG);
1652
1653                 /*
1654                  * Reset the sg list pointer.
1655                  */
1656                 scb->hscb->sgptr =
1657                         ahc_htole32(scb->sg_list_phys | SG_FULL_RESID);
1658
1659                 /*
1660                  * Copy the first SG into the "current"
1661                  * data pointer area.
1662                  */
1663                 scb->hscb->dataptr = sg->addr;
1664                 scb->hscb->datacnt = sg->len;
1665         } else {
1666                 scb->hscb->sgptr = ahc_htole32(SG_LIST_NULL);
1667                 scb->hscb->dataptr = 0;
1668                 scb->hscb->datacnt = 0;
1669                 scb->sg_count = 0;
1670         }
1671
1672         LIST_INSERT_HEAD(&ahc->pending_scbs, scb, pending_links);
1673         dev->openings--;
1674         dev->active++;
1675         dev->commands_issued++;
1676         if ((dev->flags & AHC_DEV_PERIODIC_OTAG) != 0)
1677                 dev->commands_since_idle_or_otag++;
1678
1679         scb->flags |= SCB_ACTIVE;
1680         if (untagged_q) {
1681                 TAILQ_INSERT_TAIL(untagged_q, scb, links.tqe);
1682                 scb->flags |= SCB_UNTAGGEDQ;
1683         }
1684         ahc_queue_scb(ahc, scb);
1685         return 0;
1686 }
1687
1688 /*
1689  * SCSI controller interrupt handler.
1690  */
1691 irqreturn_t
1692 ahc_linux_isr(int irq, void *dev_id, struct pt_regs * regs)
1693 {
1694         struct  ahc_softc *ahc;
1695         u_long  flags;
1696         int     ours;
1697
1698         ahc = (struct ahc_softc *) dev_id;
1699         ahc_lock(ahc, &flags);
1700         ours = ahc_intr(ahc);
1701         ahc_unlock(ahc, &flags);
1702         return IRQ_RETVAL(ours);
1703 }
1704
1705 void
1706 ahc_platform_flushwork(struct ahc_softc *ahc)
1707 {
1708
1709 }
1710
1711 void
1712 ahc_send_async(struct ahc_softc *ahc, char channel,
1713                u_int target, u_int lun, ac_code code, void *arg)
1714 {
1715         switch (code) {
1716         case AC_TRANSFER_NEG:
1717         {
1718                 char    buf[80];
1719                 struct  scsi_target *starget;
1720                 struct  ahc_linux_target *targ;
1721                 struct  info_str info;
1722                 struct  ahc_initiator_tinfo *tinfo;
1723                 struct  ahc_tmode_tstate *tstate;
1724                 int     target_offset;
1725                 unsigned int target_ppr_options;
1726
1727                 BUG_ON(target == CAM_TARGET_WILDCARD);
1728
1729                 info.buffer = buf;
1730                 info.length = sizeof(buf);
1731                 info.offset = 0;
1732                 info.pos = 0;
1733                 tinfo = ahc_fetch_transinfo(ahc, channel,
1734                                                 channel == 'A' ? ahc->our_id
1735                                                                : ahc->our_id_b,
1736                                                 target, &tstate);
1737
1738                 /*
1739                  * Don't bother reporting results while
1740                  * negotiations are still pending.
1741                  */
1742                 if (tinfo->curr.period != tinfo->goal.period
1743                  || tinfo->curr.width != tinfo->goal.width
1744                  || tinfo->curr.offset != tinfo->goal.offset
1745                  || tinfo->curr.ppr_options != tinfo->goal.ppr_options)
1746                         if (bootverbose == 0)
1747                                 break;
1748
1749                 /*
1750                  * Don't bother reporting results that
1751                  * are identical to those last reported.
1752                  */
1753                 target_offset = target;
1754                 if (channel == 'B')
1755                         target_offset += 8;
1756                 starget = ahc->platform_data->starget[target_offset];
1757                 targ = scsi_transport_target_data(starget);
1758                 if (targ == NULL)
1759                         break;
1760
1761                 target_ppr_options =
1762                         (spi_dt(starget) ? MSG_EXT_PPR_DT_REQ : 0)
1763                         + (spi_qas(starget) ? MSG_EXT_PPR_QAS_REQ : 0)
1764                         + (spi_iu(starget) ?  MSG_EXT_PPR_IU_REQ : 0);
1765
1766                 if (tinfo->curr.period == spi_period(starget)
1767                     && tinfo->curr.width == spi_width(starget)
1768                     && tinfo->curr.offset == spi_offset(starget)
1769                  && tinfo->curr.ppr_options == target_ppr_options)
1770                         if (bootverbose == 0)
1771                                 break;
1772
1773                 spi_period(starget) = tinfo->curr.period;
1774                 spi_width(starget) = tinfo->curr.width;
1775                 spi_offset(starget) = tinfo->curr.offset;
1776                 spi_dt(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_DT_REQ;
1777                 spi_qas(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_QAS_REQ;
1778                 spi_iu(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ;
1779                 spi_display_xfer_agreement(starget);
1780                 break;
1781         }
1782         case AC_SENT_BDR:
1783         {
1784                 WARN_ON(lun != CAM_LUN_WILDCARD);
1785                 scsi_report_device_reset(ahc->platform_data->host,
1786                                          channel - 'A', target);
1787                 break;
1788         }
1789         case AC_BUS_RESET:
1790                 if (ahc->platform_data->host != NULL) {
1791                         scsi_report_bus_reset(ahc->platform_data->host,
1792                                               channel - 'A');
1793                 }
1794                 break;
1795         default:
1796                 panic("ahc_send_async: Unexpected async event");
1797         }
1798 }
1799
1800 /*
1801  * Calls the higher level scsi done function and frees the scb.
1802  */
1803 void
1804 ahc_done(struct ahc_softc *ahc, struct scb *scb)
1805 {
1806         struct scsi_cmnd *cmd;
1807         struct     ahc_linux_device *dev;
1808
1809         LIST_REMOVE(scb, pending_links);
1810         if ((scb->flags & SCB_UNTAGGEDQ) != 0) {
1811                 struct scb_tailq *untagged_q;
1812                 int target_offset;
1813
1814                 target_offset = SCB_GET_TARGET_OFFSET(ahc, scb);
1815                 untagged_q = &(ahc->untagged_queues[target_offset]);
1816                 TAILQ_REMOVE(untagged_q, scb, links.tqe);
1817                 BUG_ON(!TAILQ_EMPTY(untagged_q));
1818         }
1819
1820         if ((scb->flags & SCB_ACTIVE) == 0) {
1821                 printf("SCB %d done'd twice\n", scb->hscb->tag);
1822                 ahc_dump_card_state(ahc);
1823                 panic("Stopping for safety");
1824         }
1825         cmd = scb->io_ctx;
1826         dev = scb->platform_data->dev;
1827         dev->active--;
1828         dev->openings++;
1829         if ((cmd->result & (CAM_DEV_QFRZN << 16)) != 0) {
1830                 cmd->result &= ~(CAM_DEV_QFRZN << 16);
1831                 dev->qfrozen--;
1832         }
1833         ahc_linux_unmap_scb(ahc, scb);
1834
1835         /*
1836          * Guard against stale sense data.
1837          * The Linux mid-layer assumes that sense
1838          * was retrieved anytime the first byte of
1839          * the sense buffer looks "sane".
1840          */
1841         cmd->sense_buffer[0] = 0;
1842         if (ahc_get_transaction_status(scb) == CAM_REQ_INPROG) {
1843                 uint32_t amount_xferred;
1844
1845                 amount_xferred =
1846                     ahc_get_transfer_length(scb) - ahc_get_residual(scb);
1847                 if ((scb->flags & SCB_TRANSMISSION_ERROR) != 0) {
1848 #ifdef AHC_DEBUG
1849                         if ((ahc_debug & AHC_SHOW_MISC) != 0) {
1850                                 ahc_print_path(ahc, scb);
1851                                 printf("Set CAM_UNCOR_PARITY\n");
1852                         }
1853 #endif
1854                         ahc_set_transaction_status(scb, CAM_UNCOR_PARITY);
1855 #ifdef AHC_REPORT_UNDERFLOWS
1856                 /*
1857                  * This code is disabled by default as some
1858                  * clients of the SCSI system do not properly
1859                  * initialize the underflow parameter.  This
1860                  * results in spurious termination of commands
1861                  * that complete as expected (e.g. underflow is
1862                  * allowed as command can return variable amounts
1863                  * of data.
1864                  */
1865                 } else if (amount_xferred < scb->io_ctx->underflow) {
1866                         u_int i;
1867
1868                         ahc_print_path(ahc, scb);
1869                         printf("CDB:");
1870                         for (i = 0; i < scb->io_ctx->cmd_len; i++)
1871                                 printf(" 0x%x", scb->io_ctx->cmnd[i]);
1872                         printf("\n");
1873                         ahc_print_path(ahc, scb);
1874                         printf("Saw underflow (%ld of %ld bytes). "
1875                                "Treated as error\n",
1876                                 ahc_get_residual(scb),
1877                                 ahc_get_transfer_length(scb));
1878                         ahc_set_transaction_status(scb, CAM_DATA_RUN_ERR);
1879 #endif
1880                 } else {
1881                         ahc_set_transaction_status(scb, CAM_REQ_CMP);
1882                 }
1883         } else if (ahc_get_transaction_status(scb) == CAM_SCSI_STATUS_ERROR) {
1884                 ahc_linux_handle_scsi_status(ahc, cmd->device, scb);
1885         }
1886
1887         if (dev->openings == 1
1888          && ahc_get_transaction_status(scb) == CAM_REQ_CMP
1889          && ahc_get_scsi_status(scb) != SCSI_STATUS_QUEUE_FULL)
1890                 dev->tag_success_count++;
1891         /*
1892          * Some devices deal with temporary internal resource
1893          * shortages by returning queue full.  When the queue
1894          * full occurrs, we throttle back.  Slowly try to get
1895          * back to our previous queue depth.
1896          */
1897         if ((dev->openings + dev->active) < dev->maxtags
1898          && dev->tag_success_count > AHC_TAG_SUCCESS_INTERVAL) {
1899                 dev->tag_success_count = 0;
1900                 dev->openings++;
1901         }
1902
1903         if (dev->active == 0)
1904                 dev->commands_since_idle_or_otag = 0;
1905
1906         if ((scb->flags & SCB_RECOVERY_SCB) != 0) {
1907                 printf("Recovery SCB completes\n");
1908                 if (ahc_get_transaction_status(scb) == CAM_BDR_SENT
1909                  || ahc_get_transaction_status(scb) == CAM_REQ_ABORTED)
1910                         ahc_set_transaction_status(scb, CAM_CMD_TIMEOUT);
1911                 if ((ahc->platform_data->flags & AHC_UP_EH_SEMAPHORE) != 0) {
1912                         ahc->platform_data->flags &= ~AHC_UP_EH_SEMAPHORE;
1913                         up(&ahc->platform_data->eh_sem);
1914                 }
1915         }
1916
1917         ahc_free_scb(ahc, scb);
1918         ahc_linux_queue_cmd_complete(ahc, cmd);
1919 }
1920
1921 static void
1922 ahc_linux_handle_scsi_status(struct ahc_softc *ahc,
1923                              struct scsi_device *sdev, struct scb *scb)
1924 {
1925         struct  ahc_devinfo devinfo;
1926         struct ahc_linux_device *dev = scsi_transport_device_data(sdev);
1927
1928         ahc_compile_devinfo(&devinfo,
1929                             ahc->our_id,
1930                             sdev->sdev_target->id, sdev->lun,
1931                             sdev->sdev_target->channel == 0 ? 'A' : 'B',
1932                             ROLE_INITIATOR);
1933
1934         /*
1935          * We don't currently trust the mid-layer to
1936          * properly deal with queue full or busy.  So,
1937          * when one occurs, we tell the mid-layer to
1938          * unconditionally requeue the command to us
1939          * so that we can retry it ourselves.  We also
1940          * implement our own throttling mechanism so
1941          * we don't clobber the device with too many
1942          * commands.
1943          */
1944         switch (ahc_get_scsi_status(scb)) {
1945         default:
1946                 break;
1947         case SCSI_STATUS_CHECK_COND:
1948         case SCSI_STATUS_CMD_TERMINATED:
1949         {
1950                 struct scsi_cmnd *cmd;
1951
1952                 /*
1953                  * Copy sense information to the OS's cmd
1954                  * structure if it is available.
1955                  */
1956                 cmd = scb->io_ctx;
1957                 if (scb->flags & SCB_SENSE) {
1958                         u_int sense_size;
1959
1960                         sense_size = MIN(sizeof(struct scsi_sense_data)
1961                                        - ahc_get_sense_residual(scb),
1962                                          sizeof(cmd->sense_buffer));
1963                         memcpy(cmd->sense_buffer,
1964                                ahc_get_sense_buf(ahc, scb), sense_size);
1965                         if (sense_size < sizeof(cmd->sense_buffer))
1966                                 memset(&cmd->sense_buffer[sense_size], 0,
1967                                        sizeof(cmd->sense_buffer) - sense_size);
1968                         cmd->result |= (DRIVER_SENSE << 24);
1969 #ifdef AHC_DEBUG
1970                         if (ahc_debug & AHC_SHOW_SENSE) {
1971                                 int i;
1972
1973                                 printf("Copied %d bytes of sense data:",
1974                                        sense_size);
1975                                 for (i = 0; i < sense_size; i++) {
1976                                         if ((i & 0xF) == 0)
1977                                                 printf("\n");
1978                                         printf("0x%x ", cmd->sense_buffer[i]);
1979                                 }
1980                                 printf("\n");
1981                         }
1982 #endif
1983                 }
1984                 break;
1985         }
1986         case SCSI_STATUS_QUEUE_FULL:
1987         {
1988                 /*
1989                  * By the time the core driver has returned this
1990                  * command, all other commands that were queued
1991                  * to us but not the device have been returned.
1992                  * This ensures that dev->active is equal to
1993                  * the number of commands actually queued to
1994                  * the device.
1995                  */
1996                 dev->tag_success_count = 0;
1997                 if (dev->active != 0) {
1998                         /*
1999                          * Drop our opening count to the number
2000                          * of commands currently outstanding.
2001                          */
2002                         dev->openings = 0;
2003 /*
2004                         ahc_print_path(ahc, scb);
2005                         printf("Dropping tag count to %d\n", dev->active);
2006  */
2007                         if (dev->active == dev->tags_on_last_queuefull) {
2008
2009                                 dev->last_queuefull_same_count++;
2010                                 /*
2011                                  * If we repeatedly see a queue full
2012                                  * at the same queue depth, this
2013                                  * device has a fixed number of tag
2014                                  * slots.  Lock in this tag depth
2015                                  * so we stop seeing queue fulls from
2016                                  * this device.
2017                                  */
2018                                 if (dev->last_queuefull_same_count
2019                                  == AHC_LOCK_TAGS_COUNT) {
2020                                         dev->maxtags = dev->active;
2021                                         ahc_print_path(ahc, scb);
2022                                         printf("Locking max tag count at %d\n",
2023                                                dev->active);
2024                                 }
2025                         } else {
2026                                 dev->tags_on_last_queuefull = dev->active;
2027                                 dev->last_queuefull_same_count = 0;
2028                         }
2029                         ahc_set_transaction_status(scb, CAM_REQUEUE_REQ);
2030                         ahc_set_scsi_status(scb, SCSI_STATUS_OK);
2031                         ahc_platform_set_tags(ahc, &devinfo,
2032                                      (dev->flags & AHC_DEV_Q_BASIC)
2033                                    ? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
2034                         break;
2035                 }
2036                 /*
2037                  * Drop down to a single opening, and treat this
2038                  * as if the target returned BUSY SCSI status.
2039                  */
2040                 dev->openings = 1;
2041                 ahc_set_scsi_status(scb, SCSI_STATUS_BUSY);
2042                 ahc_platform_set_tags(ahc, &devinfo,
2043                              (dev->flags & AHC_DEV_Q_BASIC)
2044                            ? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
2045                 break;
2046         }
2047         }
2048 }
2049
2050 static void
2051 ahc_linux_queue_cmd_complete(struct ahc_softc *ahc, struct scsi_cmnd *cmd)
2052 {
2053         /*
2054          * Map CAM error codes into Linux Error codes.  We
2055          * avoid the conversion so that the DV code has the
2056          * full error information available when making
2057          * state change decisions.
2058          */
2059         {
2060                 u_int new_status;
2061
2062                 switch (ahc_cmd_get_transaction_status(cmd)) {
2063                 case CAM_REQ_INPROG:
2064                 case CAM_REQ_CMP:
2065                 case CAM_SCSI_STATUS_ERROR:
2066                         new_status = DID_OK;
2067                         break;
2068                 case CAM_REQ_ABORTED:
2069                         new_status = DID_ABORT;
2070                         break;
2071                 case CAM_BUSY:
2072                         new_status = DID_BUS_BUSY;
2073                         break;
2074                 case CAM_REQ_INVALID:
2075                 case CAM_PATH_INVALID:
2076                         new_status = DID_BAD_TARGET;
2077                         break;
2078                 case CAM_SEL_TIMEOUT:
2079                         new_status = DID_NO_CONNECT;
2080                         break;
2081                 case CAM_SCSI_BUS_RESET:
2082                 case CAM_BDR_SENT:
2083                         new_status = DID_RESET;
2084                         break;
2085                 case CAM_UNCOR_PARITY:
2086                         new_status = DID_PARITY;
2087                         break;
2088                 case CAM_CMD_TIMEOUT:
2089                         new_status = DID_TIME_OUT;
2090                         break;
2091                 case CAM_UA_ABORT:
2092                 case CAM_REQ_CMP_ERR:
2093                 case CAM_AUTOSENSE_FAIL:
2094                 case CAM_NO_HBA:
2095                 case CAM_DATA_RUN_ERR:
2096                 case CAM_UNEXP_BUSFREE:
2097                 case CAM_SEQUENCE_FAIL:
2098                 case CAM_CCB_LEN_ERR:
2099                 case CAM_PROVIDE_FAIL:
2100                 case CAM_REQ_TERMIO:
2101                 case CAM_UNREC_HBA_ERROR:
2102                 case CAM_REQ_TOO_BIG:
2103                         new_status = DID_ERROR;
2104                         break;
2105                 case CAM_REQUEUE_REQ:
2106                         new_status = DID_REQUEUE;
2107                         break;
2108                 default:
2109                         /* We should never get here */
2110                         new_status = DID_ERROR;
2111                         break;
2112                 }
2113
2114                 ahc_cmd_set_transaction_status(cmd, new_status);
2115         }
2116
2117         cmd->scsi_done(cmd);
2118 }
2119
2120 static void
2121 ahc_linux_sem_timeout(u_long arg)
2122 {
2123         struct  ahc_softc *ahc;
2124         u_long  s;
2125
2126         ahc = (struct ahc_softc *)arg;
2127
2128         ahc_lock(ahc, &s);
2129         if ((ahc->platform_data->flags & AHC_UP_EH_SEMAPHORE) != 0) {
2130                 ahc->platform_data->flags &= ~AHC_UP_EH_SEMAPHORE;
2131                 up(&ahc->platform_data->eh_sem);
2132         }
2133         ahc_unlock(ahc, &s);
2134 }
2135
2136 static void
2137 ahc_linux_freeze_simq(struct ahc_softc *ahc)
2138 {
2139         ahc->platform_data->qfrozen++;
2140         if (ahc->platform_data->qfrozen == 1) {
2141                 scsi_block_requests(ahc->platform_data->host);
2142
2143                 /* XXX What about Twin channels? */
2144                 ahc_platform_abort_scbs(ahc, CAM_TARGET_WILDCARD, ALL_CHANNELS,
2145                                         CAM_LUN_WILDCARD, SCB_LIST_NULL,
2146                                         ROLE_INITIATOR, CAM_REQUEUE_REQ);
2147         }
2148 }
2149
2150 static void
2151 ahc_linux_release_simq(u_long arg)
2152 {
2153         struct ahc_softc *ahc;
2154         u_long s;
2155         int    unblock_reqs;
2156
2157         ahc = (struct ahc_softc *)arg;
2158
2159         unblock_reqs = 0;
2160         ahc_lock(ahc, &s);
2161         if (ahc->platform_data->qfrozen > 0)
2162                 ahc->platform_data->qfrozen--;
2163         if (ahc->platform_data->qfrozen == 0)
2164                 unblock_reqs = 1;
2165         ahc_unlock(ahc, &s);
2166         /*
2167          * There is still a race here.  The mid-layer
2168          * should keep its own freeze count and use
2169          * a bottom half handler to run the queues
2170          * so we can unblock with our own lock held.
2171          */
2172         if (unblock_reqs)
2173                 scsi_unblock_requests(ahc->platform_data->host);
2174 }
2175
2176 static int
2177 ahc_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag)
2178 {
2179         struct ahc_softc *ahc;
2180         struct ahc_linux_device *dev;
2181         struct scb *pending_scb;
2182         u_int  saved_scbptr;
2183         u_int  active_scb_index;
2184         u_int  last_phase;
2185         u_int  saved_scsiid;
2186         u_int  cdb_byte;
2187         int    retval;
2188         int    was_paused;
2189         int    paused;
2190         int    wait;
2191         int    disconnected;
2192
2193         pending_scb = NULL;
2194         paused = FALSE;
2195         wait = FALSE;
2196         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
2197
2198         printf("%s:%d:%d:%d: Attempting to queue a%s message\n",
2199                ahc_name(ahc), cmd->device->channel,
2200                cmd->device->id, cmd->device->lun,
2201                flag == SCB_ABORT ? "n ABORT" : " TARGET RESET");
2202
2203         printf("CDB:");
2204         for (cdb_byte = 0; cdb_byte < cmd->cmd_len; cdb_byte++)
2205                 printf(" 0x%x", cmd->cmnd[cdb_byte]);
2206         printf("\n");
2207
2208         spin_lock_irq(&ahc->platform_data->spin_lock);
2209
2210         /*
2211          * First determine if we currently own this command.
2212          * Start by searching the device queue.  If not found
2213          * there, check the pending_scb list.  If not found
2214          * at all, and the system wanted us to just abort the
2215          * command, return success.
2216          */
2217         dev = scsi_transport_device_data(cmd->device);
2218
2219         if (dev == NULL) {
2220                 /*
2221                  * No target device for this command exists,
2222                  * so we must not still own the command.
2223                  */
2224                 printf("%s:%d:%d:%d: Is not an active device\n",
2225                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2226                        cmd->device->lun);
2227                 retval = SUCCESS;
2228                 goto no_cmd;
2229         }
2230
2231         if ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED)) == 0
2232          && ahc_search_untagged_queues(ahc, cmd, cmd->device->id,
2233                                        cmd->device->channel + 'A',
2234                                        cmd->device->lun,
2235                                        CAM_REQ_ABORTED, SEARCH_COMPLETE) != 0) {
2236                 printf("%s:%d:%d:%d: Command found on untagged queue\n",
2237                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2238                        cmd->device->lun);
2239                 retval = SUCCESS;
2240                 goto done;
2241         }
2242
2243         /*
2244          * See if we can find a matching cmd in the pending list.
2245          */
2246         LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
2247                 if (pending_scb->io_ctx == cmd)
2248                         break;
2249         }
2250
2251         if (pending_scb == NULL && flag == SCB_DEVICE_RESET) {
2252
2253                 /* Any SCB for this device will do for a target reset */
2254                 LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
2255                         if (ahc_match_scb(ahc, pending_scb, cmd->device->id,
2256                                           cmd->device->channel + 'A',
2257                                           CAM_LUN_WILDCARD,
2258                                           SCB_LIST_NULL, ROLE_INITIATOR) == 0)
2259                                 break;
2260                 }
2261         }
2262
2263         if (pending_scb == NULL) {
2264                 printf("%s:%d:%d:%d: Command not found\n",
2265                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2266                        cmd->device->lun);
2267                 goto no_cmd;
2268         }
2269
2270         if ((pending_scb->flags & SCB_RECOVERY_SCB) != 0) {
2271                 /*
2272                  * We can't queue two recovery actions using the same SCB
2273                  */
2274                 retval = FAILED;
2275                 goto  done;
2276         }
2277
2278         /*
2279          * Ensure that the card doesn't do anything
2280          * behind our back and that we didn't "just" miss
2281          * an interrupt that would affect this cmd.
2282          */
2283         was_paused = ahc_is_paused(ahc);
2284         ahc_pause_and_flushwork(ahc);
2285         paused = TRUE;
2286
2287         if ((pending_scb->flags & SCB_ACTIVE) == 0) {
2288                 printf("%s:%d:%d:%d: Command already completed\n",
2289                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2290                        cmd->device->lun);
2291                 goto no_cmd;
2292         }
2293
2294         printf("%s: At time of recovery, card was %spaused\n",
2295                ahc_name(ahc), was_paused ? "" : "not ");
2296         ahc_dump_card_state(ahc);
2297
2298         disconnected = TRUE;
2299         if (flag == SCB_ABORT) {
2300                 if (ahc_search_qinfifo(ahc, cmd->device->id,
2301                                        cmd->device->channel + 'A',
2302                                        cmd->device->lun,
2303                                        pending_scb->hscb->tag,
2304                                        ROLE_INITIATOR, CAM_REQ_ABORTED,
2305                                        SEARCH_COMPLETE) > 0) {
2306                         printf("%s:%d:%d:%d: Cmd aborted from QINFIFO\n",
2307                                ahc_name(ahc), cmd->device->channel,
2308                                         cmd->device->id, cmd->device->lun);
2309                         retval = SUCCESS;
2310                         goto done;
2311                 }
2312         } else if (ahc_search_qinfifo(ahc, cmd->device->id,
2313                                       cmd->device->channel + 'A',
2314                                       cmd->device->lun, pending_scb->hscb->tag,
2315                                       ROLE_INITIATOR, /*status*/0,
2316                                       SEARCH_COUNT) > 0) {
2317                 disconnected = FALSE;
2318         }
2319
2320         if (disconnected && (ahc_inb(ahc, SEQ_FLAGS) & NOT_IDENTIFIED) == 0) {
2321                 struct scb *bus_scb;
2322
2323                 bus_scb = ahc_lookup_scb(ahc, ahc_inb(ahc, SCB_TAG));
2324                 if (bus_scb == pending_scb)
2325                         disconnected = FALSE;
2326                 else if (flag != SCB_ABORT
2327                       && ahc_inb(ahc, SAVED_SCSIID) == pending_scb->hscb->scsiid
2328                       && ahc_inb(ahc, SAVED_LUN) == SCB_GET_LUN(pending_scb))
2329                         disconnected = FALSE;
2330         }
2331
2332         /*
2333          * At this point, pending_scb is the scb associated with the
2334          * passed in command.  That command is currently active on the
2335          * bus, is in the disconnected state, or we're hoping to find
2336          * a command for the same target active on the bus to abuse to
2337          * send a BDR.  Queue the appropriate message based on which of
2338          * these states we are in.
2339          */
2340         last_phase = ahc_inb(ahc, LASTPHASE);
2341         saved_scbptr = ahc_inb(ahc, SCBPTR);
2342         active_scb_index = ahc_inb(ahc, SCB_TAG);
2343         saved_scsiid = ahc_inb(ahc, SAVED_SCSIID);
2344         if (last_phase != P_BUSFREE
2345          && (pending_scb->hscb->tag == active_scb_index
2346           || (flag == SCB_DEVICE_RESET
2347            && SCSIID_TARGET(ahc, saved_scsiid) == cmd->device->id))) {
2348
2349                 /*
2350                  * We're active on the bus, so assert ATN
2351                  * and hope that the target responds.
2352                  */
2353                 pending_scb = ahc_lookup_scb(ahc, active_scb_index);
2354                 pending_scb->flags |= SCB_RECOVERY_SCB|flag;
2355                 ahc_outb(ahc, MSG_OUT, HOST_MSG);
2356                 ahc_outb(ahc, SCSISIGO, last_phase|ATNO);
2357                 printf("%s:%d:%d:%d: Device is active, asserting ATN\n",
2358                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2359                        cmd->device->lun);
2360                 wait = TRUE;
2361         } else if (disconnected) {
2362
2363                 /*
2364                  * Actually re-queue this SCB in an attempt
2365                  * to select the device before it reconnects.
2366                  * In either case (selection or reselection),
2367                  * we will now issue the approprate message
2368                  * to the timed-out device.
2369                  *
2370                  * Set the MK_MESSAGE control bit indicating
2371                  * that we desire to send a message.  We
2372                  * also set the disconnected flag since
2373                  * in the paging case there is no guarantee
2374                  * that our SCB control byte matches the
2375                  * version on the card.  We don't want the
2376                  * sequencer to abort the command thinking
2377                  * an unsolicited reselection occurred.
2378                  */
2379                 pending_scb->hscb->control |= MK_MESSAGE|DISCONNECTED;
2380                 pending_scb->flags |= SCB_RECOVERY_SCB|flag;
2381
2382                 /*
2383                  * Remove any cached copy of this SCB in the
2384                  * disconnected list in preparation for the
2385                  * queuing of our abort SCB.  We use the
2386                  * same element in the SCB, SCB_NEXT, for
2387                  * both the qinfifo and the disconnected list.
2388                  */
2389                 ahc_search_disc_list(ahc, cmd->device->id,
2390                                      cmd->device->channel + 'A',
2391                                      cmd->device->lun, pending_scb->hscb->tag,
2392                                      /*stop_on_first*/TRUE,
2393                                      /*remove*/TRUE,
2394                                      /*save_state*/FALSE);
2395
2396                 /*
2397                  * In the non-paging case, the sequencer will
2398                  * never re-reference the in-core SCB.
2399                  * To make sure we are notified during
2400                  * reslection, set the MK_MESSAGE flag in
2401                  * the card's copy of the SCB.
2402                  */
2403                 if ((ahc->flags & AHC_PAGESCBS) == 0) {
2404                         ahc_outb(ahc, SCBPTR, pending_scb->hscb->tag);
2405                         ahc_outb(ahc, SCB_CONTROL,
2406                                  ahc_inb(ahc, SCB_CONTROL)|MK_MESSAGE);
2407                 }
2408
2409                 /*
2410                  * Clear out any entries in the QINFIFO first
2411                  * so we are the next SCB for this target
2412                  * to run.
2413                  */
2414                 ahc_search_qinfifo(ahc, cmd->device->id,
2415                                    cmd->device->channel + 'A',
2416                                    cmd->device->lun, SCB_LIST_NULL,
2417                                    ROLE_INITIATOR, CAM_REQUEUE_REQ,
2418                                    SEARCH_COMPLETE);
2419                 ahc_qinfifo_requeue_tail(ahc, pending_scb);
2420                 ahc_outb(ahc, SCBPTR, saved_scbptr);
2421                 ahc_print_path(ahc, pending_scb);
2422                 printf("Device is disconnected, re-queuing SCB\n");
2423                 wait = TRUE;
2424         } else {
2425                 printf("%s:%d:%d:%d: Unable to deliver message\n",
2426                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2427                        cmd->device->lun);
2428                 retval = FAILED;
2429                 goto done;
2430         }
2431
2432 no_cmd:
2433         /*
2434          * Our assumption is that if we don't have the command, no
2435          * recovery action was required, so we return success.  Again,
2436          * the semantics of the mid-layer recovery engine are not
2437          * well defined, so this may change in time.
2438          */
2439         retval = SUCCESS;
2440 done:
2441         if (paused)
2442                 ahc_unpause(ahc);
2443         if (wait) {
2444                 struct timer_list timer;
2445                 int ret;
2446
2447                 ahc->platform_data->flags |= AHC_UP_EH_SEMAPHORE;
2448                 spin_unlock_irq(&ahc->platform_data->spin_lock);
2449                 init_timer(&timer);
2450                 timer.data = (u_long)ahc;
2451                 timer.expires = jiffies + (5 * HZ);
2452                 timer.function = ahc_linux_sem_timeout;
2453                 add_timer(&timer);
2454                 printf("Recovery code sleeping\n");
2455                 down(&ahc->platform_data->eh_sem);
2456                 printf("Recovery code awake\n");
2457                 ret = del_timer_sync(&timer);
2458                 if (ret == 0) {
2459                         printf("Timer Expired\n");
2460                         retval = FAILED;
2461                 }
2462                 spin_lock_irq(&ahc->platform_data->spin_lock);
2463         }
2464
2465         spin_unlock_irq(&ahc->platform_data->spin_lock);
2466         return (retval);
2467 }
2468
2469 void
2470 ahc_platform_dump_card_state(struct ahc_softc *ahc)
2471 {
2472 }
2473
2474 static void ahc_linux_exit(void);
2475
2476 static void ahc_linux_set_width(struct scsi_target *starget, int width)
2477 {
2478         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2479         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2480         struct ahc_devinfo devinfo;
2481         unsigned long flags;
2482
2483         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2484                             starget->channel + 'A', ROLE_INITIATOR);
2485         ahc_lock(ahc, &flags);
2486         ahc_set_width(ahc, &devinfo, width, AHC_TRANS_GOAL, FALSE);
2487         ahc_unlock(ahc, &flags);
2488 }
2489
2490 static void ahc_linux_set_period(struct scsi_target *starget, int period)
2491 {
2492         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2493         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2494         struct ahc_tmode_tstate *tstate;
2495         struct ahc_initiator_tinfo *tinfo
2496                 = ahc_fetch_transinfo(ahc,
2497                                       starget->channel + 'A',
2498                                       shost->this_id, starget->id, &tstate);
2499         struct ahc_devinfo devinfo;
2500         unsigned int ppr_options = tinfo->goal.ppr_options;
2501         unsigned long flags;
2502         unsigned long offset = tinfo->goal.offset;
2503         struct ahc_syncrate *syncrate;
2504
2505         if (offset == 0)
2506                 offset = MAX_OFFSET;
2507
2508         if (period < 9)
2509                 period = 9;     /* 12.5ns is our minimum */
2510         if (period == 9)
2511                 ppr_options |= MSG_EXT_PPR_DT_REQ;
2512
2513         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2514                             starget->channel + 'A', ROLE_INITIATOR);
2515
2516         /* all PPR requests apart from QAS require wide transfers */
2517         if (ppr_options & ~MSG_EXT_PPR_QAS_REQ) {
2518                 if (spi_width(starget) == 0)
2519                         ppr_options &= MSG_EXT_PPR_QAS_REQ;
2520         }
2521
2522         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2523         ahc_lock(ahc, &flags);
2524         ahc_set_syncrate(ahc, &devinfo, syncrate, period, offset,
2525                          ppr_options, AHC_TRANS_GOAL, FALSE);
2526         ahc_unlock(ahc, &flags);
2527 }
2528
2529 static void ahc_linux_set_offset(struct scsi_target *starget, int offset)
2530 {
2531         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2532         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2533         struct ahc_tmode_tstate *tstate;
2534         struct ahc_initiator_tinfo *tinfo
2535                 = ahc_fetch_transinfo(ahc,
2536                                       starget->channel + 'A',
2537                                       shost->this_id, starget->id, &tstate);
2538         struct ahc_devinfo devinfo;
2539         unsigned int ppr_options = 0;
2540         unsigned int period = 0;
2541         unsigned long flags;
2542         struct ahc_syncrate *syncrate = NULL;
2543
2544         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2545                             starget->channel + 'A', ROLE_INITIATOR);
2546         if (offset != 0) {
2547                 syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2548                 period = tinfo->goal.period;
2549                 ppr_options = tinfo->goal.ppr_options;
2550         }
2551         ahc_lock(ahc, &flags);
2552         ahc_set_syncrate(ahc, &devinfo, syncrate, period, offset,
2553                          ppr_options, AHC_TRANS_GOAL, FALSE);
2554         ahc_unlock(ahc, &flags);
2555 }
2556
2557 static void ahc_linux_set_dt(struct scsi_target *starget, int dt)
2558 {
2559         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2560         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2561         struct ahc_tmode_tstate *tstate;
2562         struct ahc_initiator_tinfo *tinfo
2563                 = ahc_fetch_transinfo(ahc,
2564                                       starget->channel + 'A',
2565                                       shost->this_id, starget->id, &tstate);
2566         struct ahc_devinfo devinfo;
2567         unsigned int ppr_options = tinfo->goal.ppr_options
2568                 & ~MSG_EXT_PPR_DT_REQ;
2569         unsigned int period = tinfo->goal.period;
2570         unsigned long flags;
2571         struct ahc_syncrate *syncrate;
2572
2573         if (dt) {
2574                 period = 9;     /* 12.5ns is the only period valid for DT */
2575                 ppr_options |= MSG_EXT_PPR_DT_REQ;
2576         } else if (period == 9)
2577                 period = 10;    /* if resetting DT, period must be >= 25ns */
2578
2579         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2580                             starget->channel + 'A', ROLE_INITIATOR);
2581         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options,AHC_SYNCRATE_DT);
2582         ahc_lock(ahc, &flags);
2583         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2584                          ppr_options, AHC_TRANS_GOAL, FALSE);
2585         ahc_unlock(ahc, &flags);
2586 }
2587
2588 #if 0
2589 /* FIXME: This code claims to support IU and QAS.  However, the actual
2590  * sequencer code and aic7xxx_core have no support for these parameters and
2591  * will get into a bad state if they're negotiated.  Do not enable this
2592  * unless you know what you're doing */
2593 static void ahc_linux_set_qas(struct scsi_target *starget, int qas)
2594 {
2595         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2596         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2597         struct ahc_tmode_tstate *tstate;
2598         struct ahc_initiator_tinfo *tinfo
2599                 = ahc_fetch_transinfo(ahc,
2600                                       starget->channel + 'A',
2601                                       shost->this_id, starget->id, &tstate);
2602         struct ahc_devinfo devinfo;
2603         unsigned int ppr_options = tinfo->goal.ppr_options
2604                 & ~MSG_EXT_PPR_QAS_REQ;
2605         unsigned int period = tinfo->goal.period;
2606         unsigned long flags;
2607         struct ahc_syncrate *syncrate;
2608
2609         if (qas)
2610                 ppr_options |= MSG_EXT_PPR_QAS_REQ;
2611
2612         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2613                             starget->channel + 'A', ROLE_INITIATOR);
2614         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2615         ahc_lock(ahc, &flags);
2616         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2617                          ppr_options, AHC_TRANS_GOAL, FALSE);
2618         ahc_unlock(ahc, &flags);
2619 }
2620
2621 static void ahc_linux_set_iu(struct scsi_target *starget, int iu)
2622 {
2623         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2624         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2625         struct ahc_tmode_tstate *tstate;
2626         struct ahc_initiator_tinfo *tinfo
2627                 = ahc_fetch_transinfo(ahc,
2628                                       starget->channel + 'A',
2629                                       shost->this_id, starget->id, &tstate);
2630         struct ahc_devinfo devinfo;
2631         unsigned int ppr_options = tinfo->goal.ppr_options
2632                 & ~MSG_EXT_PPR_IU_REQ;
2633         unsigned int period = tinfo->goal.period;
2634         unsigned long flags;
2635         struct ahc_syncrate *syncrate;
2636
2637         if (iu)
2638                 ppr_options |= MSG_EXT_PPR_IU_REQ;
2639
2640         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2641                             starget->channel + 'A', ROLE_INITIATOR);
2642         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2643         ahc_lock(ahc, &flags);
2644         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2645                          ppr_options, AHC_TRANS_GOAL, FALSE);
2646         ahc_unlock(ahc, &flags);
2647 }
2648 #endif
2649
2650 static struct spi_function_template ahc_linux_transport_functions = {
2651         .set_offset     = ahc_linux_set_offset,
2652         .show_offset    = 1,
2653         .set_period     = ahc_linux_set_period,
2654         .show_period    = 1,
2655         .set_width      = ahc_linux_set_width,
2656         .show_width     = 1,
2657         .set_dt         = ahc_linux_set_dt,
2658         .show_dt        = 1,
2659 #if 0
2660         .set_iu         = ahc_linux_set_iu,
2661         .show_iu        = 1,
2662         .set_qas        = ahc_linux_set_qas,
2663         .show_qas       = 1,
2664 #endif
2665 };
2666
2667
2668
2669 static int __init
2670 ahc_linux_init(void)
2671 {
2672         /*
2673          * If we've been passed any parameters, process them now.
2674          */
2675         if (aic7xxx)
2676                 aic7xxx_setup(aic7xxx);
2677
2678         ahc_linux_transport_template =
2679                 spi_attach_transport(&ahc_linux_transport_functions);
2680         if (!ahc_linux_transport_template)
2681                 return -ENODEV;
2682
2683         scsi_transport_reserve_target(ahc_linux_transport_template,
2684                                       sizeof(struct ahc_linux_target));
2685         scsi_transport_reserve_device(ahc_linux_transport_template,
2686                                       sizeof(struct ahc_linux_device));
2687
2688         /*
2689          * Initialize our softc list lock prior to
2690          * probing for any adapters.
2691          */
2692         ahc_list_lockinit();
2693
2694         ahc_linux_pci_init();
2695         ahc_linux_eisa_init();
2696         return 0;
2697 }
2698
2699 static void
2700 ahc_linux_exit(void)
2701 {
2702         ahc_linux_pci_exit();
2703         ahc_linux_eisa_exit();
2704         spi_release_transport(ahc_linux_transport_template);
2705 }
2706
2707 module_init(ahc_linux_init);
2708 module_exit(ahc_linux_exit);