drivers/scsi/aic7xxx/aic7xxx_osm.c

   1 /*
   2  * Adaptec AIC7xxx device driver for Linux.
   3  *
   4  * $Id: //depot/aic7xxx/linux/drivers/scsi/aic7xxx/aic7xxx_osm.c#235 $
   5  *
   6  * Copyright (c) 1994 John Aycock
   7  *   The University of Calgary Department of Computer Science.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2, or (at your option)
  12  * any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; see the file COPYING.  If not, write to
  21  * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  22  *
  23  * Sources include the Adaptec 1740 driver (aha1740.c), the Ultrastor 24F
  24  * driver (ultrastor.c), various Linux kernel source, the Adaptec EISA
  25  * config file (!adp7771.cfg), the Adaptec AHA-2740A Series User's Guide,
  26  * the Linux Kernel Hacker's Guide, Writing a SCSI Device Driver for Linux,
  27  * the Adaptec 1542 driver (aha1542.c), the Adaptec EISA overlay file
  28  * (adp7770.ovl), the Adaptec AHA-2740 Series Technical Reference Manual,
  29  * the Adaptec AIC-7770 Data Book, the ANSI SCSI specification, the
  30  * ANSI SCSI-2 specification (draft 10c), ...
  31  *
  32  * --------------------------------------------------------------------------
  33  *
  34  *  Modifications by Daniel M. Eischen (deischen@iworks.InterWorks.org):
  35  *
  36  *  Substantially modified to include support for wide and twin bus
  37  *  adapters, DMAing of SCBs, tagged queueing, IRQ sharing, bug fixes,
  38  *  SCB paging, and other rework of the code.
  39  *
  40  * --------------------------------------------------------------------------
  41  * Copyright (c) 1994-2000 Justin T. Gibbs.
  42  * Copyright (c) 2000-2001 Adaptec Inc.
  43  * All rights reserved.
  44  *
  45  * Redistribution and use in source and binary forms, with or without
  46  * modification, are permitted provided that the following conditions
  47  * are met:
  48  * 1. Redistributions of source code must retain the above copyright
  49  *    notice, this list of conditions, and the following disclaimer,
  50  *    without modification.
  51  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  52  *    substantially similar to the "NO WARRANTY" disclaimer below
  53  *    ("Disclaimer") and any redistribution must be conditioned upon
  54  *    including a substantially similar Disclaimer requirement for further
  55  *    binary redistribution.
  56  * 3. Neither the names of the above-listed copyright holders nor the names
  57  *    of any contributors may be used to endorse or promote products derived
  58  *    from this software without specific prior written permission.
  59  *
  60  * Alternatively, this software may be distributed under the terms of the
  61  * GNU General Public License ("GPL") version 2 as published by the Free
  62  * Software Foundation.
  63  *
  64  * NO WARRANTY
  65  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  66  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  67  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  68  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  69  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  70  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  71  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  72  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  73  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  74  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  75  * POSSIBILITY OF SUCH DAMAGES.
  76  *
  77  *---------------------------------------------------------------------------
  78  *
  79  *  Thanks also go to (in alphabetical order) the following:
  80  *
  81  *    Rory Bolt     - Sequencer bug fixes
  82  *    Jay Estabrook - Initial DEC Alpha support
  83  *    Doug Ledford  - Much needed abort/reset bug fixes
  84  *    Kai Makisara  - DMAing of SCBs
  85  *
  86  *  A Boot time option was also added for not resetting the scsi bus.
  87  *
  88  *    Form:  aic7xxx=extended
  89  *           aic7xxx=no_reset
  90  *           aic7xxx=verbose
  91  *
  92  *  Daniel M. Eischen, deischen@iworks.InterWorks.org, 1/23/97
  93  *
  94  *  Id: aic7xxx.c,v 4.1 1997/06/12 08:23:42 deang Exp
  95  */
  96
  97 /*
  98  * Further driver modifications made by Doug Ledford <dledford@redhat.com>
  99  *
 100  * Copyright (c) 1997-1999 Doug Ledford
 101  *
 102  * These changes are released under the same licensing terms as the FreeBSD
 103  * driver written by Justin Gibbs.  Please see his Copyright notice above
 104  * for the exact terms and conditions covering my changes as well as the
 105  * warranty statement.
 106  *
 107  * Modifications made to the aic7xxx.c,v 4.1 driver from Dan Eischen include
 108  * but are not limited to:
 109  *
 110  *  1: Import of the latest FreeBSD sequencer code for this driver
 111  *  2: Modification of kernel code to accommodate different sequencer semantics
 112  *  3: Extensive changes throughout kernel portion of driver to improve
 113  *     abort/reset processing and error hanndling
 114  *  4: Other work contributed by various people on the Internet
 115  *  5: Changes to printk information and verbosity selection code
 116  *  6: General reliability related changes, especially in IRQ management
 117  *  7: Modifications to the default probe/attach order for supported cards
 118  *  8: SMP friendliness has been improved
 119  *
 120  */
 121
 122 #include "aic7xxx_osm.h"
 123 #include "aic7xxx_inline.h"
 124 #include <scsi/scsicam.h>
 125
 126 static struct scsi_transport_template *ahc_linux_transport_template = NULL;
 127
 128 #include <linux/init.h>         /* __setup */
 129 #include <linux/mm.h>           /* For fetching system memory size */
 130 #include <linux/blkdev.h>               /* For block_size() */
 131 #include <linux/delay.h>        /* For ssleep/msleep */
 132 #include <linux/slab.h>
 133
 134
 135 /*
 136  * Set this to the delay in seconds after SCSI bus reset.
 137  * Note, we honor this only for the initial bus reset.
 138  * The scsi error recovery code performs its own bus settle
 139  * delay handling for error recovery actions.
 140  */
 141 #ifdef CONFIG_AIC7XXX_RESET_DELAY_MS
 142 #define AIC7XXX_RESET_DELAY CONFIG_AIC7XXX_RESET_DELAY_MS
 143 #else
 144 #define AIC7XXX_RESET_DELAY 5000
 145 #endif
 146
 147 /*
 148  * To change the default number of tagged transactions allowed per-device,
 149  * add a line to the lilo.conf file like:
 150  * append="aic7xxx=verbose,tag_info:{{32,32,32,32},{32,32,32,32}}"
 151  * which will result in the first four devices on the first two
 152  * controllers being set to a tagged queue depth of 32.
 153  *
 154  * The tag_commands is an array of 16 to allow for wide and twin adapters.
 155  * Twin adapters will use indexes 0-7 for channel 0, and indexes 8-15
 156  * for channel 1.
 157  */
 158 typedef struct {
 159         uint8_t tag_commands[16];       /* Allow for wide/twin adapters. */
 160 } adapter_tag_info_t;
 161
 162 /*
 163  * Modify this as you see fit for your system.
 164  *
 165  * 0                    tagged queuing disabled
 166  * 1 <= n <= 253        n == max tags ever dispatched.
 167  *
 168  * The driver will throttle the number of commands dispatched to a
 169  * device if it returns queue full.  For devices with a fixed maximum
 170  * queue depth, the driver will eventually determine this depth and
 171  * lock it in (a console message is printed to indicate that a lock
 172  * has occurred).  On some devices, queue full is returned for a temporary
 173  * resource shortage.  These devices will return queue full at varying
 174  * depths.  The driver will throttle back when the queue fulls occur and
 175  * attempt to slowly increase the depth over time as the device recovers
 176  * from the resource shortage.
 177  *
 178  * In this example, the first line will disable tagged queueing for all
 179  * the devices on the first probed aic7xxx adapter.
 180  *
 181  * The second line enables tagged queueing with 4 commands/LUN for IDs
 182  * (0, 2-11, 13-15), disables tagged queueing for ID 12, and tells the
 183  * driver to attempt to use up to 64 tags for ID 1.
 184  *
 185  * The third line is the same as the first line.
 186  *
 187  * The fourth line disables tagged queueing for devices 0 and 3.  It
 188  * enables tagged queueing for the other IDs, with 16 commands/LUN
 189  * for IDs 1 and 4, 127 commands/LUN for ID 8, and 4 commands/LUN for
 190  * IDs 2, 5-7, and 9-15.
 191  */
 192
 193 /*
 194  * NOTE: The below structure is for reference only, the actual structure
 195  *       to modify in order to change things is just below this comment block.
 196 adapter_tag_info_t aic7xxx_tag_info[] =
 197 {
 198         {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
 199         {{4, 64, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 0, 4, 4, 4}},
 200         {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
 201         {{0, 16, 4, 0, 16, 4, 4, 4, 127, 4, 4, 4, 4, 4, 4, 4}}
 202 };
 203 */
 204
 205 #ifdef CONFIG_AIC7XXX_CMDS_PER_DEVICE
 206 #define AIC7XXX_CMDS_PER_DEVICE CONFIG_AIC7XXX_CMDS_PER_DEVICE
 207 #else
 208 #define AIC7XXX_CMDS_PER_DEVICE AHC_MAX_QUEUE
 209 #endif
 210
 211 #define AIC7XXX_CONFIGED_TAG_COMMANDS {                                 \
 212         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 213         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 214         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 215         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 216         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 217         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 218         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 219         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE                \
 220 }
 221
 222 /*
 223  * By default, use the number of commands specified by
 224  * the users kernel configuration.
 225  */
 226 static adapter_tag_info_t aic7xxx_tag_info[] =
 227 {
 228         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 229         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 230         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 231         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 232         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 233         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 234         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 235         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 236         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 237         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 238         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 239         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 240         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 241         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 242         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 243         {AIC7XXX_CONFIGED_TAG_COMMANDS}
 244 };
 245
 246 /*
 247  * There should be a specific return value for this in scsi.h, but
 248  * it seems that most drivers ignore it.
 249  */
 250 #define DID_UNDERFLOW   DID_ERROR
 251
 252 void
 253 ahc_print_path(struct ahc_softc *ahc, struct scb *scb)
 254 {
 255         printk("(scsi%d:%c:%d:%d): ",
 256                ahc->platform_data->host->host_no,
 257                scb != NULL ? SCB_GET_CHANNEL(ahc, scb) : 'X',
 258                scb != NULL ? SCB_GET_TARGET(ahc, scb) : -1,
 259                scb != NULL ? SCB_GET_LUN(scb) : -1);
 260 }
 261
 262 /*
 263  * XXX - these options apply unilaterally to _all_ 274x/284x/294x
 264  *       cards in the system.  This should be fixed.  Exceptions to this
 265  *       rule are noted in the comments.
 266  */
 267
 268 /*
 269  * Skip the scsi bus reset.  Non 0 make us skip the reset at startup.  This
 270  * has no effect on any later resets that might occur due to things like
 271  * SCSI bus timeouts.
 272  */
 273 static uint32_t aic7xxx_no_reset;
 274
 275 /*
 276  * Should we force EXTENDED translation on a controller.
 277  *     0 == Use whatever is in the SEEPROM or default to off
 278  *     1 == Use whatever is in the SEEPROM or default to on
 279  */
 280 static uint32_t aic7xxx_extended;
 281
 282 /*
 283  * PCI bus parity checking of the Adaptec controllers.  This is somewhat
 284  * dubious at best.  To my knowledge, this option has never actually
 285  * solved a PCI parity problem, but on certain machines with broken PCI
 286  * chipset configurations where stray PCI transactions with bad parity are
 287  * the norm rather than the exception, the error messages can be overwhelming.
 288  * It's included in the driver for completeness.
 289  *   0     = Shut off PCI parity check
 290  *   non-0 = reverse polarity pci parity checking
 291  */
 292 static uint32_t aic7xxx_pci_parity = ~0;
 293
 294 /*
 295  * There are lots of broken chipsets in the world.  Some of them will
 296  * violate the PCI spec when we issue byte sized memory writes to our
 297  * controller.  I/O mapped register access, if allowed by the given
 298  * platform, will work in almost all cases.
 299  */
 300 uint32_t aic7xxx_allow_memio = ~0;
 301
 302 /*
 303  * So that we can set how long each device is given as a selection timeout.
 304  * The table of values goes like this:
 305  *   0 - 256ms
 306  *   1 - 128ms
 307  *   2 - 64ms
 308  *   3 - 32ms
 309  * We default to 256ms because some older devices need a longer time
 310  * to respond to initial selection.
 311  */
 312 static uint32_t aic7xxx_seltime;
 313
 314 /*
 315  * Certain devices do not perform any aging on commands.  Should the
 316  * device be saturated by commands in one portion of the disk, it is
 317  * possible for transactions on far away sectors to never be serviced.
 318  * To handle these devices, we can periodically send an ordered tag to
 319  * force all outstanding transactions to be serviced prior to a new
 320  * transaction.
 321  */
 322 static uint32_t aic7xxx_periodic_otag;
 323
 324 /*
 325  * Module information and settable options.
 326  */
 327 static char *aic7xxx = NULL;
 328
 329 MODULE_AUTHOR("Maintainer: Hannes Reinecke <hare@suse.de>");
 330 MODULE_DESCRIPTION("Adaptec AIC77XX/78XX SCSI Host Bus Adapter driver");
 331 MODULE_LICENSE("Dual BSD/GPL");
 332 MODULE_VERSION(AIC7XXX_DRIVER_VERSION);
 333 module_param(aic7xxx, charp, 0444);
 334 MODULE_PARM_DESC(aic7xxx,
 335 "period-delimited options string:\n"
 336 "       verbose                 Enable verbose/diagnostic logging\n"
 337 "       allow_memio             Allow device registers to be memory mapped\n"
 338 "       debug                   Bitmask of debug values to enable\n"
 339 "       no_probe                Toggle EISA/VLB controller probing\n"
 340 "       probe_eisa_vl           Toggle EISA/VLB controller probing\n"
 341 "       no_reset                Suppress initial bus resets\n"
 342 "       extended                Enable extended geometry on all controllers\n"
 343 "       periodic_otag           Send an ordered tagged transaction\n"
 344 "                               periodically to prevent tag starvation.\n"
 345 "                               This may be required by some older disk\n"
 346 "                               drives or RAID arrays.\n"
 347 "       tag_info:<tag_str>      Set per-target tag depth\n"
 348 "       global_tag_depth:<int>  Global tag depth for every target\n"
 349 "                               on every bus\n"
 350 "       seltime:<int>           Selection Timeout\n"
 351 "                               (0/256ms,1/128ms,2/64ms,3/32ms)\n"
 352 "\n"
 353 "       Sample modprobe configuration file:\n"
 354 "       #       Toggle EISA/VLB probing\n"
 355 "       #       Set tag depth on Controller 1/Target 1 to 10 tags\n"
 356 "       #       Shorten the selection timeout to 128ms\n"
 357 "\n"
 358 "       options aic7xxx 'aic7xxx=probe_eisa_vl.tag_info:{{}.{.10}}.seltime:1'\n"
 359 );
 360
 361 static void ahc_linux_handle_scsi_status(struct ahc_softc *,
 362                                          struct scsi_device *,
 363                                          struct scb *);
 364 static void ahc_linux_queue_cmd_complete(struct ahc_softc *ahc,
 365                                          struct scsi_cmnd *cmd);
 366 static void ahc_linux_freeze_simq(struct ahc_softc *ahc);
 367 static void ahc_linux_release_simq(struct ahc_softc *ahc);
 368 static int  ahc_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag);
 369 static void ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc);
 370 static u_int ahc_linux_user_tagdepth(struct ahc_softc *ahc,
 371                                      struct ahc_devinfo *devinfo);
 372 static void ahc_linux_device_queue_depth(struct scsi_device *);
 373 static int ahc_linux_run_command(struct ahc_softc*,
 374                                  struct ahc_linux_device *,
 375                                  struct scsi_cmnd *);
 376 static void ahc_linux_setup_tag_info_global(char *p);
 377 static int  aic7xxx_setup(char *s);
 378
 379 static int ahc_linux_unit;
 380
 381
 382 /************************** OS Utility Wrappers *******************************/
 383 void
 384 ahc_delay(long usec)
 385 {
 386         /*
 387          * udelay on Linux can have problems for
 388          * multi-millisecond waits.  Wait at most
 389          * 1024us per call.
 390          */
 391         while (usec > 0) {
 392                 udelay(usec % 1024);
 393                 usec -= 1024;
 394         }
 395 }
 396
 397 /***************************** Low Level I/O **********************************/
 398 uint8_t
 399 ahc_inb(struct ahc_softc * ahc, long port)
 400 {
 401         uint8_t x;
 402
 403         if (ahc->tag == BUS_SPACE_MEMIO) {
 404                 x = readb(ahc->bsh.maddr + port);
 405         } else {
 406                 x = inb(ahc->bsh.ioport + port);
 407         }
 408         mb();
 409         return (x);
 410 }
 411
 412 void
 413 ahc_outb(struct ahc_softc * ahc, long port, uint8_t val)
 414 {
 415         if (ahc->tag == BUS_SPACE_MEMIO) {
 416                 writeb(val, ahc->bsh.maddr + port);
 417         } else {
 418                 outb(val, ahc->bsh.ioport + port);
 419         }
 420         mb();
 421 }
 422
 423 void
 424 ahc_outsb(struct ahc_softc * ahc, long port, uint8_t *array, int count)
 425 {
 426         int i;
 427
 428         /*
 429          * There is probably a more efficient way to do this on Linux
 430          * but we don't use this for anything speed critical and this
 431          * should work.
 432          */
 433         for (i = 0; i < count; i++)
 434                 ahc_outb(ahc, port, *array++);
 435 }
 436
 437 void
 438 ahc_insb(struct ahc_softc * ahc, long port, uint8_t *array, int count)
 439 {
 440         int i;
 441
 442         /*
 443          * There is probably a more efficient way to do this on Linux
 444          * but we don't use this for anything speed critical and this
 445          * should work.
 446          */
 447         for (i = 0; i < count; i++)
 448                 *array++ = ahc_inb(ahc, port);
 449 }
 450
 451 /********************************* Inlines ************************************/
 452 static void ahc_linux_unmap_scb(struct ahc_softc*, struct scb*);
 453
 454 static int ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb,
 455                                       struct ahc_dma_seg *sg,
 456                                       dma_addr_t addr, bus_size_t len);
 457
 458 static void
 459 ahc_linux_unmap_scb(struct ahc_softc *ahc, struct scb *scb)
 460 {
 461         struct scsi_cmnd *cmd;
 462
 463         cmd = scb->io_ctx;
 464         ahc_sync_sglist(ahc, scb, BUS_DMASYNC_POSTWRITE);
 465
 466         scsi_dma_unmap(cmd);
 467 }
 468
 469 static int
 470 ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb,
 471                   struct ahc_dma_seg *sg, dma_addr_t addr, bus_size_t len)
 472 {
 473         int      consumed;
 474
 475         if ((scb->sg_count + 1) > AHC_NSEG)
 476                 panic("Too few segs for dma mapping.  "
 477                       "Increase AHC_NSEG\n");
 478
 479         consumed = 1;
 480         sg->addr = ahc_htole32(addr & 0xFFFFFFFF);
 481         scb->platform_data->xfer_len += len;
 482
 483         if (sizeof(dma_addr_t) > 4
 484          && (ahc->flags & AHC_39BIT_ADDRESSING) != 0)
 485                 len |= (addr >> 8) & AHC_SG_HIGH_ADDR_MASK;
 486
 487         sg->len = ahc_htole32(len);
 488         return (consumed);
 489 }
 490
 491 /*
 492  * Return a string describing the driver.
 493  */
 494 static const char *
 495 ahc_linux_info(struct Scsi_Host *host)
 496 {
 497         static char buffer[512];
 498         char    ahc_info[256];
 499         char   *bp;
 500         struct ahc_softc *ahc;
 501
 502         bp = &buffer[0];
 503         ahc = *(struct ahc_softc **)host->hostdata;
 504         memset(bp, 0, sizeof(buffer));
 505         strcpy(bp, "Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev " AIC7XXX_DRIVER_VERSION "\n"
 506                         "        <");
 507         strcat(bp, ahc->description);
 508         strcat(bp, ">\n"
 509                         "        ");
 510         ahc_controller_info(ahc, ahc_info);
 511         strcat(bp, ahc_info);
 512         strcat(bp, "\n");
 513
 514         return (bp);
 515 }
 516
 517 /*
 518  * Queue an SCB to the controller.
 519  */
 520 static int
 521 ahc_linux_queue_lck(struct scsi_cmnd * cmd, void (*scsi_done) (struct scsi_cmnd *))
 522 {
 523         struct   ahc_softc *ahc;
 524         struct   ahc_linux_device *dev = scsi_transport_device_data(cmd->device);
 525         int rtn = SCSI_MLQUEUE_HOST_BUSY;
 526         unsigned long flags;
 527
 528         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
 529
 530         ahc_lock(ahc, &flags);
 531         if (ahc->platform_data->qfrozen == 0) {
 532                 cmd->scsi_done = scsi_done;
 533                 cmd->result = CAM_REQ_INPROG << 16;
 534                 rtn = ahc_linux_run_command(ahc, dev, cmd);
 535         }
 536         ahc_unlock(ahc, &flags);
 537
 538         return rtn;
 539 }
 540
 541 static DEF_SCSI_QCMD(ahc_linux_queue)
 542
 543 static inline struct scsi_target **
 544 ahc_linux_target_in_softc(struct scsi_target *starget)
 545 {
 546         struct  ahc_softc *ahc =
 547                 *((struct ahc_softc **)dev_to_shost(&starget->dev)->hostdata);
 548         unsigned int target_offset;
 549
 550         target_offset = starget->id;
 551         if (starget->channel != 0)
 552                 target_offset += 8;
 553
 554         return &ahc->platform_data->starget[target_offset];
 555 }
 556
 557 static int
 558 ahc_linux_target_alloc(struct scsi_target *starget)
 559 {
 560         struct  ahc_softc *ahc =
 561                 *((struct ahc_softc **)dev_to_shost(&starget->dev)->hostdata);
 562         struct seeprom_config *sc = ahc->seep_config;
 563         unsigned long flags;
 564         struct scsi_target **ahc_targp = ahc_linux_target_in_softc(starget);
 565         unsigned short scsirate;
 566         struct ahc_devinfo devinfo;
 567         struct ahc_initiator_tinfo *tinfo;
 568         struct ahc_tmode_tstate *tstate;
 569         char channel = starget->channel + 'A';
 570         unsigned int our_id = ahc->our_id;
 571         unsigned int target_offset;
 572
 573         target_offset = starget->id;
 574         if (starget->channel != 0)
 575                 target_offset += 8;
 576
 577         if (starget->channel)
 578                 our_id = ahc->our_id_b;
 579
 580         ahc_lock(ahc, &flags);
 581
 582         BUG_ON(*ahc_targp != NULL);
 583
 584         *ahc_targp = starget;
 585
 586         if (sc) {
 587                 int maxsync = AHC_SYNCRATE_DT;
 588                 int ultra = 0;
 589                 int flags = sc->device_flags[target_offset];
 590
 591                 if (ahc->flags & AHC_NEWEEPROM_FMT) {
 592                     if (flags & CFSYNCHISULTRA)
 593                         ultra = 1;
 594                 } else if (flags & CFULTRAEN)
 595                         ultra = 1;
 596                 /* AIC nutcase; 10MHz appears as ultra = 1, CFXFER = 0x04
 597                  * change it to ultra=0, CFXFER = 0 */
 598                 if(ultra && (flags & CFXFER) == 0x04) {
 599                         ultra = 0;
 600                         flags &= ~CFXFER;
 601                 }
 602
 603                 if ((ahc->features & AHC_ULTRA2) != 0) {
 604                         scsirate = (flags & CFXFER) | (ultra ? 0x8 : 0);
 605                 } else {
 606                         scsirate = (flags & CFXFER) << 4;
 607                         maxsync = ultra ? AHC_SYNCRATE_ULTRA :
 608                                 AHC_SYNCRATE_FAST;
 609                 }
 610                 spi_max_width(starget) = (flags & CFWIDEB) ? 1 : 0;
 611                 if (!(flags & CFSYNCH))
 612                         spi_max_offset(starget) = 0;
 613                 spi_min_period(starget) =
 614                         ahc_find_period(ahc, scsirate, maxsync);
 615
 616                 tinfo = ahc_fetch_transinfo(ahc, channel, ahc->our_id,
 617                                             starget->id, &tstate);
 618         }
 619         ahc_compile_devinfo(&devinfo, our_id, starget->id,
 620                             CAM_LUN_WILDCARD, channel,
 621                             ROLE_INITIATOR);
 622         ahc_set_syncrate(ahc, &devinfo, NULL, 0, 0, 0,
 623                          AHC_TRANS_GOAL, /*paused*/FALSE);
 624         ahc_set_width(ahc, &devinfo, MSG_EXT_WDTR_BUS_8_BIT,
 625                       AHC_TRANS_GOAL, /*paused*/FALSE);
 626         ahc_unlock(ahc, &flags);
 627
 628         return 0;
 629 }
 630
 631 static void
 632 ahc_linux_target_destroy(struct scsi_target *starget)
 633 {
 634         struct scsi_target **ahc_targp = ahc_linux_target_in_softc(starget);
 635
 636         *ahc_targp = NULL;
 637 }
 638
 639 static int
 640 ahc_linux_slave_alloc(struct scsi_device *sdev)
 641 {
 642         struct  ahc_softc *ahc =
 643                 *((struct ahc_softc **)sdev->host->hostdata);
 644         struct scsi_target *starget = sdev->sdev_target;
 645         struct ahc_linux_device *dev;
 646
 647         if (bootverbose)
 648                 printk("%s: Slave Alloc %d\n", ahc_name(ahc), sdev->id);
 649
 650         dev = scsi_transport_device_data(sdev);
 651         memset(dev, 0, sizeof(*dev));
 652
 653         /*
 654          * We start out life using untagged
 655          * transactions of which we allow one.
 656          */
 657         dev->openings = 1;
 658
 659         /*
 660          * Set maxtags to 0.  This will be changed if we
 661          * later determine that we are dealing with
 662          * a tagged queuing capable device.
 663          */
 664         dev->maxtags = 0;
 665
 666         spi_period(starget) = 0;
 667
 668         return 0;
 669 }
 670
 671 static int
 672 ahc_linux_slave_configure(struct scsi_device *sdev)
 673 {
 674         struct  ahc_softc *ahc;
 675
 676         ahc = *((struct ahc_softc **)sdev->host->hostdata);
 677
 678         if (bootverbose)
 679                 sdev_printk(KERN_INFO, sdev, "Slave Configure\n");
 680
 681         ahc_linux_device_queue_depth(sdev);
 682
 683         /* Initial Domain Validation */
 684         if (!spi_initial_dv(sdev->sdev_target))
 685                 spi_dv_device(sdev);
 686
 687         return 0;
 688 }
 689
 690 #if defined(__i386__)
 691 /*
 692  * Return the disk geometry for the given SCSI device.
 693  */
 694 static int
 695 ahc_linux_biosparam(struct scsi_device *sdev, struct block_device *bdev,
 696                     sector_t capacity, int geom[])
 697 {
 698         int      heads;
 699         int      sectors;
 700         int      cylinders;
 701         int      extended;
 702         struct   ahc_softc *ahc;
 703         u_int    channel;
 704
 705         ahc = *((struct ahc_softc **)sdev->host->hostdata);
 706         channel = sdev_channel(sdev);
 707
 708         if (scsi_partsize(bdev, capacity, geom))
 709                 return 0;
 710
 711         heads = 64;
 712         sectors = 32;
 713         cylinders = aic_sector_div(capacity, heads, sectors);
 714
 715         if (aic7xxx_extended != 0)
 716                 extended = 1;
 717         else if (channel == 0)
 718                 extended = (ahc->flags & AHC_EXTENDED_TRANS_A) != 0;
 719         else
 720                 extended = (ahc->flags & AHC_EXTENDED_TRANS_B) != 0;
 721         if (extended && cylinders >= 1024) {
 722                 heads = 255;
 723                 sectors = 63;
 724                 cylinders = aic_sector_div(capacity, heads, sectors);
 725         }
 726         geom[0] = heads;
 727         geom[1] = sectors;
 728         geom[2] = cylinders;
 729         return (0);
 730 }
 731 #endif
 732
 733 /*
 734  * Abort the current SCSI command(s).
 735  */
 736 static int
 737 ahc_linux_abort(struct scsi_cmnd *cmd)
 738 {
 739         int error;
 740
 741         error = ahc_linux_queue_recovery_cmd(cmd, SCB_ABORT);
 742         if (error != 0)
 743                 printk("aic7xxx_abort returns 0x%x\n", error);
 744         return (error);
 745 }
 746
 747 /*
 748  * Attempt to send a target reset message to the device that timed out.
 749  */
 750 static int
 751 ahc_linux_dev_reset(struct scsi_cmnd *cmd)
 752 {
 753         int error;
 754
 755         error = ahc_linux_queue_recovery_cmd(cmd, SCB_DEVICE_RESET);
 756         if (error != 0)
 757                 printk("aic7xxx_dev_reset returns 0x%x\n", error);
 758         return (error);
 759 }
 760
 761 /*
 762  * Reset the SCSI bus.
 763  */
 764 static int
 765 ahc_linux_bus_reset(struct scsi_cmnd *cmd)
 766 {
 767         struct ahc_softc *ahc;
 768         int    found;
 769         unsigned long flags;
 770
 771         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
 772
 773         ahc_lock(ahc, &flags);
 774         found = ahc_reset_channel(ahc, scmd_channel(cmd) + 'A',
 775                                   /*initiate reset*/TRUE);
 776         ahc_unlock(ahc, &flags);
 777
 778         if (bootverbose)
 779                 printk("%s: SCSI bus reset delivered. "
 780                        "%d SCBs aborted.\n", ahc_name(ahc), found);
 781
 782         return SUCCESS;
 783 }
 784
 785 struct scsi_host_template aic7xxx_driver_template = {
 786         .module                 = THIS_MODULE,
 787         .name                   = "aic7xxx",
 788         .proc_name              = "aic7xxx",
 789         .show_info              = ahc_linux_show_info,
 790         .write_info             = ahc_proc_write_seeprom,
 791         .info                   = ahc_linux_info,
 792         .queuecommand           = ahc_linux_queue,
 793         .eh_abort_handler       = ahc_linux_abort,
 794         .eh_device_reset_handler = ahc_linux_dev_reset,
 795         .eh_bus_reset_handler   = ahc_linux_bus_reset,
 796 #if defined(__i386__)
 797         .bios_param             = ahc_linux_biosparam,
 798 #endif
 799         .can_queue              = AHC_MAX_QUEUE,
 800         .this_id                = -1,
 801         .max_sectors            = 8192,
 802         .cmd_per_lun            = 2,
 803         .slave_alloc            = ahc_linux_slave_alloc,
 804         .slave_configure        = ahc_linux_slave_configure,
 805         .target_alloc           = ahc_linux_target_alloc,
 806         .target_destroy         = ahc_linux_target_destroy,
 807 };
 808
 809 /**************************** Tasklet Handler *********************************/
 810
 811 /******************************** Macros **************************************/
 812 #define BUILD_SCSIID(ahc, cmd)                                              \
 813         ((((cmd)->device->id << TID_SHIFT) & TID)                           \
 814         | (((cmd)->device->channel == 0) ? (ahc)->our_id : (ahc)->our_id_b) \
 815         | (((cmd)->device->channel == 0) ? 0 : TWIN_CHNLB))
 816
 817 /******************************** Bus DMA *************************************/
 818 int
 819 ahc_dma_tag_create(struct ahc_softc *ahc, bus_dma_tag_t parent,
 820                    bus_size_t alignment, bus_size_t boundary,
 821                    dma_addr_t lowaddr, dma_addr_t highaddr,
 822                    bus_dma_filter_t *filter, void *filterarg,
 823                    bus_size_t maxsize, int nsegments,
 824                    bus_size_t maxsegsz, int flags, bus_dma_tag_t *ret_tag)
 825 {
 826         bus_dma_tag_t dmat;
 827
 828         dmat = kmalloc(sizeof(*dmat), GFP_ATOMIC);
 829         if (dmat == NULL)
 830                 return (ENOMEM);
 831
 832         /*
 833          * Linux is very simplistic about DMA memory.  For now don't
 834          * maintain all specification information.  Once Linux supplies
 835          * better facilities for doing these operations, or the
 836          * needs of this particular driver change, we might need to do
 837          * more here.
 838          */
 839         dmat->alignment = alignment;
 840         dmat->boundary = boundary;
 841         dmat->maxsize = maxsize;
 842         *ret_tag = dmat;
 843         return (0);
 844 }
 845
 846 void
 847 ahc_dma_tag_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat)
 848 {
 849         kfree(dmat);
 850 }
 851
 852 int
 853 ahc_dmamem_alloc(struct ahc_softc *ahc, bus_dma_tag_t dmat, void** vaddr,
 854                  int flags, bus_dmamap_t *mapp)
 855 {
 856         /* XXX: check if we really need the GFP_ATOMIC and unwind this mess! */
 857         *vaddr = dma_alloc_coherent(ahc->dev, dmat->maxsize, mapp, GFP_ATOMIC);
 858         if (*vaddr == NULL)
 859                 return ENOMEM;
 860         return 0;
 861 }
 862
 863 void
 864 ahc_dmamem_free(struct ahc_softc *ahc, bus_dma_tag_t dmat,
 865                 void* vaddr, bus_dmamap_t map)
 866 {
 867         dma_free_coherent(ahc->dev, dmat->maxsize, vaddr, map);
 868 }
 869
 870 int
 871 ahc_dmamap_load(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map,
 872                 void *buf, bus_size_t buflen, bus_dmamap_callback_t *cb,
 873                 void *cb_arg, int flags)
 874 {
 875         /*
 876          * Assume for now that this will only be used during
 877          * initialization and not for per-transaction buffer mapping.
 878          */
 879         bus_dma_segment_t stack_sg;
 880
 881         stack_sg.ds_addr = map;
 882         stack_sg.ds_len = dmat->maxsize;
 883         cb(cb_arg, &stack_sg, /*nseg*/1, /*error*/0);
 884         return (0);
 885 }
 886
 887 void
 888 ahc_dmamap_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
 889 {
 890 }
 891
 892 int
 893 ahc_dmamap_unload(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
 894 {
 895         /* Nothing to do */
 896         return (0);
 897 }
 898
 899 static void
 900 ahc_linux_setup_tag_info_global(char *p)
 901 {
 902         int tags, i, j;
 903
 904         tags = simple_strtoul(p + 1, NULL, 0) & 0xff;
 905         printk("Setting Global Tags= %d\n", tags);
 906
 907         for (i = 0; i < ARRAY_SIZE(aic7xxx_tag_info); i++) {
 908                 for (j = 0; j < AHC_NUM_TARGETS; j++) {
 909                         aic7xxx_tag_info[i].tag_commands[j] = tags;
 910                 }
 911         }
 912 }
 913
 914 static void
 915 ahc_linux_setup_tag_info(u_long arg, int instance, int targ, int32_t value)
 916 {
 917
 918         if ((instance >= 0) && (targ >= 0)
 919          && (instance < ARRAY_SIZE(aic7xxx_tag_info))
 920          && (targ < AHC_NUM_TARGETS)) {
 921                 aic7xxx_tag_info[instance].tag_commands[targ] = value & 0xff;
 922                 if (bootverbose)
 923                         printk("tag_info[%d:%d] = %d\n", instance, targ, value);
 924         }
 925 }
 926
 927 static char *
 928 ahc_parse_brace_option(char *opt_name, char *opt_arg, char *end, int depth,
 929                        void (*callback)(u_long, int, int, int32_t),
 930                        u_long callback_arg)
 931 {
 932         char    *tok_end;
 933         char    *tok_end2;
 934         int      i;
 935         int      instance;
 936         int      targ;
 937         int      done;
 938         char     tok_list[] = {'.', ',', '{', '}', '\0'};
 939
 940         /* All options use a ':' name/arg separator */
 941         if (*opt_arg != ':')
 942                 return (opt_arg);
 943         opt_arg++;
 944         instance = -1;
 945         targ = -1;
 946         done = FALSE;
 947         /*
 948          * Restore separator that may be in
 949          * the middle of our option argument.
 950          */
 951         tok_end = strchr(opt_arg, '\0');
 952         if (tok_end < end)
 953                 *tok_end = ',';
 954         while (!done) {
 955                 switch (*opt_arg) {
 956                 case '{':
 957                         if (instance == -1) {
 958                                 instance = 0;
 959                         } else {
 960                                 if (depth > 1) {
 961                                         if (targ == -1)
 962                                                 targ = 0;
 963                                 } else {
 964                                         printk("Malformed Option %s\n",
 965                                                opt_name);
 966                                         done = TRUE;
 967                                 }
 968                         }
 969                         opt_arg++;
 970                         break;
 971                 case '}':
 972                         if (targ != -1)
 973                                 targ = -1;
 974                         else if (instance != -1)
 975                                 instance = -1;
 976                         opt_arg++;
 977                         break;
 978                 case ',':
 979                 case '.':
 980                         if (instance == -1)
 981                                 done = TRUE;
 982                         else if (targ >= 0)
 983                                 targ++;
 984                         else if (instance >= 0)
 985                                 instance++;
 986                         opt_arg++;
 987                         break;
 988                 case '\0':
 989                         done = TRUE;
 990                         break;
 991                 default:
 992                         tok_end = end;
 993                         for (i = 0; tok_list[i]; i++) {
 994                                 tok_end2 = strchr(opt_arg, tok_list[i]);
 995                                 if ((tok_end2) && (tok_end2 < tok_end))
 996                                         tok_end = tok_end2;
 997                         }
 998                         callback(callback_arg, instance, targ,
 999                                  simple_strtol(opt_arg, NULL, 0));
1000                         opt_arg = tok_end;
1001                         break;
1002                 }
1003         }
1004         return (opt_arg);
1005 }
1006
1007 /*
1008  * Handle Linux boot parameters. This routine allows for assigning a value
1009  * to a parameter with a ':' between the parameter and the value.
1010  * ie. aic7xxx=stpwlev:1,extended
1011  */
1012 static int
1013 aic7xxx_setup(char *s)
1014 {
1015         int     i, n;
1016         char   *p;
1017         char   *end;
1018
1019         static const struct {
1020                 const char *name;
1021                 uint32_t *flag;
1022         } options[] = {
1023                 { "extended", &aic7xxx_extended },
1024                 { "no_reset", &aic7xxx_no_reset },
1025                 { "verbose", &aic7xxx_verbose },
1026                 { "allow_memio", &aic7xxx_allow_memio},
1027 #ifdef AHC_DEBUG
1028                 { "debug", &ahc_debug },
1029 #endif
1030                 { "periodic_otag", &aic7xxx_periodic_otag },
1031                 { "pci_parity", &aic7xxx_pci_parity },
1032                 { "seltime", &aic7xxx_seltime },
1033                 { "tag_info", NULL },
1034                 { "global_tag_depth", NULL },
1035                 { "dv", NULL }
1036         };
1037
1038         end = strchr(s, '\0');
1039
1040         /*
1041          * XXX ia64 gcc isn't smart enough to know that ARRAY_SIZE
1042          * will never be 0 in this case.
1043          */
1044         n = 0;
1045
1046         while ((p = strsep(&s, ",.")) != NULL) {
1047                 if (*p == '\0')
1048                         continue;
1049                 for (i = 0; i < ARRAY_SIZE(options); i++) {
1050
1051                         n = strlen(options[i].name);
1052                         if (strncmp(options[i].name, p, n) == 0)
1053                                 break;
1054                 }
1055                 if (i == ARRAY_SIZE(options))
1056                         continue;
1057
1058                 if (strncmp(p, "global_tag_depth", n) == 0) {
1059                         ahc_linux_setup_tag_info_global(p + n);
1060                 } else if (strncmp(p, "tag_info", n) == 0) {
1061                         s = ahc_parse_brace_option("tag_info", p + n, end,
1062                             2, ahc_linux_setup_tag_info, 0);
1063                 } else if (p[n] == ':') {
1064                         *(options[i].flag) = simple_strtoul(p + n + 1, NULL, 0);
1065                 } else if (strncmp(p, "verbose", n) == 0) {
1066                         *(options[i].flag) = 1;
1067                 } else {
1068                         *(options[i].flag) ^= 0xFFFFFFFF;
1069                 }
1070         }
1071         return 1;
1072 }
1073
1074 __setup("aic7xxx=", aic7xxx_setup);
1075
1076 uint32_t aic7xxx_verbose;
1077
1078 int
1079 ahc_linux_register_host(struct ahc_softc *ahc, struct scsi_host_template *template)
1080 {
1081         char    buf[80];
1082         struct  Scsi_Host *host;
1083         char    *new_name;
1084         u_long  s;
1085         int     retval;
1086
1087         template->name = ahc->description;
1088         host = scsi_host_alloc(template, sizeof(struct ahc_softc *));
1089         if (host == NULL)
1090                 return (ENOMEM);
1091
1092         *((struct ahc_softc **)host->hostdata) = ahc;
1093         ahc->platform_data->host = host;
1094         host->can_queue = AHC_MAX_QUEUE;
1095         host->cmd_per_lun = 2;
1096         /* XXX No way to communicate the ID for multiple channels */
1097         host->this_id = ahc->our_id;
1098         host->irq = ahc->platform_data->irq;
1099         host->max_id = (ahc->features & AHC_WIDE) ? 16 : 8;
1100         host->max_lun = AHC_NUM_LUNS;
1101         host->max_channel = (ahc->features & AHC_TWIN) ? 1 : 0;
1102         host->sg_tablesize = AHC_NSEG;
1103         ahc_lock(ahc, &s);
1104         ahc_set_unit(ahc, ahc_linux_unit++);
1105         ahc_unlock(ahc, &s);
1106         sprintf(buf, "scsi%d", host->host_no);
1107         new_name = kmalloc(strlen(buf) + 1, GFP_ATOMIC);
1108         if (new_name != NULL) {
1109                 strcpy(new_name, buf);
1110                 ahc_set_name(ahc, new_name);
1111         }
1112         host->unique_id = ahc->unit;
1113         ahc_linux_initialize_scsi_bus(ahc);
1114         ahc_intr_enable(ahc, TRUE);
1115
1116         host->transportt = ahc_linux_transport_template;
1117
1118         retval = scsi_add_host(host, ahc->dev);
1119         if (retval) {
1120                 printk(KERN_WARNING "aic7xxx: scsi_add_host failed\n");
1121                 scsi_host_put(host);
1122                 return retval;
1123         }
1124
1125         scsi_scan_host(host);
1126         return 0;
1127 }
1128
1129 /*
1130  * Place the SCSI bus into a known state by either resetting it,
1131  * or forcing transfer negotiations on the next command to any
1132  * target.
1133  */
1134 static void
1135 ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc)
1136 {
1137         int i;
1138         int numtarg;
1139         unsigned long s;
1140
1141         i = 0;
1142         numtarg = 0;
1143
1144         ahc_lock(ahc, &s);
1145
1146         if (aic7xxx_no_reset != 0)
1147                 ahc->flags &= ~(AHC_RESET_BUS_A|AHC_RESET_BUS_B);
1148
1149         if ((ahc->flags & AHC_RESET_BUS_A) != 0)
1150                 ahc_reset_channel(ahc, 'A', /*initiate_reset*/TRUE);
1151         else
1152                 numtarg = (ahc->features & AHC_WIDE) ? 16 : 8;
1153
1154         if ((ahc->features & AHC_TWIN) != 0) {
1155
1156                 if ((ahc->flags & AHC_RESET_BUS_B) != 0) {
1157                         ahc_reset_channel(ahc, 'B', /*initiate_reset*/TRUE);
1158                 } else {
1159                         if (numtarg == 0)
1160                                 i = 8;
1161                         numtarg += 8;
1162                 }
1163         }
1164
1165         /*
1166          * Force negotiation to async for all targets that
1167          * will not see an initial bus reset.
1168          */
1169         for (; i < numtarg; i++) {
1170                 struct ahc_devinfo devinfo;
1171                 struct ahc_initiator_tinfo *tinfo;
1172                 struct ahc_tmode_tstate *tstate;
1173                 u_int our_id;
1174                 u_int target_id;
1175                 char channel;
1176
1177                 channel = 'A';
1178                 our_id = ahc->our_id;
1179                 target_id = i;
1180                 if (i > 7 && (ahc->features & AHC_TWIN) != 0) {
1181                         channel = 'B';
1182                         our_id = ahc->our_id_b;
1183                         target_id = i % 8;
1184                 }
1185                 tinfo = ahc_fetch_transinfo(ahc, channel, our_id,
1186                                             target_id, &tstate);
1187                 ahc_compile_devinfo(&devinfo, our_id, target_id,
1188                                     CAM_LUN_WILDCARD, channel, ROLE_INITIATOR);
1189                 ahc_update_neg_request(ahc, &devinfo, tstate,
1190                                        tinfo, AHC_NEG_ALWAYS);
1191         }
1192         ahc_unlock(ahc, &s);
1193         /* Give the bus some time to recover */
1194         if ((ahc->flags & (AHC_RESET_BUS_A|AHC_RESET_BUS_B)) != 0) {
1195                 ahc_linux_freeze_simq(ahc);
1196                 msleep(AIC7XXX_RESET_DELAY);
1197                 ahc_linux_release_simq(ahc);
1198         }
1199 }
1200
1201 int
1202 ahc_platform_alloc(struct ahc_softc *ahc, void *platform_arg)
1203 {
1204
1205         ahc->platform_data =
1206             kzalloc(sizeof(struct ahc_platform_data), GFP_ATOMIC);
1207         if (ahc->platform_data == NULL)
1208                 return (ENOMEM);
1209         ahc->platform_data->irq = AHC_LINUX_NOIRQ;
1210         ahc_lockinit(ahc);
1211         ahc->seltime = (aic7xxx_seltime & 0x3) << 4;
1212         ahc->seltime_b = (aic7xxx_seltime & 0x3) << 4;
1213         if (aic7xxx_pci_parity == 0)
1214                 ahc->flags |= AHC_DISABLE_PCI_PERR;
1215
1216         return (0);
1217 }
1218
1219 void
1220 ahc_platform_free(struct ahc_softc *ahc)
1221 {
1222         struct scsi_target *starget;
1223         int i;
1224
1225         if (ahc->platform_data != NULL) {
1226                 /* destroy all of the device and target objects */
1227                 for (i = 0; i < AHC_NUM_TARGETS; i++) {
1228                         starget = ahc->platform_data->starget[i];
1229                         if (starget != NULL) {
1230                                 ahc->platform_data->starget[i] = NULL;
1231                         }
1232                 }
1233
1234                 if (ahc->platform_data->irq != AHC_LINUX_NOIRQ)
1235                         free_irq(ahc->platform_data->irq, ahc);
1236                 if (ahc->tag == BUS_SPACE_PIO
1237                  && ahc->bsh.ioport != 0)
1238                         release_region(ahc->bsh.ioport, 256);
1239                 if (ahc->tag == BUS_SPACE_MEMIO
1240                  && ahc->bsh.maddr != NULL) {
1241                         iounmap(ahc->bsh.maddr);
1242                         release_mem_region(ahc->platform_data->mem_busaddr,
1243                                            0x1000);
1244                 }
1245
1246                 if (ahc->platform_data->host)
1247                         scsi_host_put(ahc->platform_data->host);
1248
1249                 kfree(ahc->platform_data);
1250         }
1251 }
1252
1253 void
1254 ahc_platform_freeze_devq(struct ahc_softc *ahc, struct scb *scb)
1255 {
1256         ahc_platform_abort_scbs(ahc, SCB_GET_TARGET(ahc, scb),
1257                                 SCB_GET_CHANNEL(ahc, scb),
1258                                 SCB_GET_LUN(scb), SCB_LIST_NULL,
1259                                 ROLE_UNKNOWN, CAM_REQUEUE_REQ);
1260 }
1261
1262 void
1263 ahc_platform_set_tags(struct ahc_softc *ahc, struct scsi_device *sdev,
1264                       struct ahc_devinfo *devinfo, ahc_queue_alg alg)
1265 {
1266         struct ahc_linux_device *dev;
1267         int was_queuing;
1268         int now_queuing;
1269
1270         if (sdev == NULL)
1271                 return;
1272         dev = scsi_transport_device_data(sdev);
1273
1274         was_queuing = dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED);
1275         switch (alg) {
1276         default:
1277         case AHC_QUEUE_NONE:
1278                 now_queuing = 0;
1279                 break;
1280         case AHC_QUEUE_BASIC:
1281                 now_queuing = AHC_DEV_Q_BASIC;
1282                 break;
1283         case AHC_QUEUE_TAGGED:
1284                 now_queuing = AHC_DEV_Q_TAGGED;
1285                 break;
1286         }
1287         if ((dev->flags & AHC_DEV_FREEZE_TIL_EMPTY) == 0
1288          && (was_queuing != now_queuing)
1289          && (dev->active != 0)) {
1290                 dev->flags |= AHC_DEV_FREEZE_TIL_EMPTY;
1291                 dev->qfrozen++;
1292         }
1293
1294         dev->flags &= ~(AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED|AHC_DEV_PERIODIC_OTAG);
1295         if (now_queuing) {
1296                 u_int usertags;
1297
1298                 usertags = ahc_linux_user_tagdepth(ahc, devinfo);
1299                 if (!was_queuing) {
1300                         /*
1301                          * Start out aggressively and allow our
1302                          * dynamic queue depth algorithm to take
1303                          * care of the rest.
1304                          */
1305                         dev->maxtags = usertags;
1306                         dev->openings = dev->maxtags - dev->active;
1307                 }
1308                 if (dev->maxtags == 0) {
1309                         /*
1310                          * Queueing is disabled by the user.
1311                          */
1312                         dev->openings = 1;
1313                 } else if (alg == AHC_QUEUE_TAGGED) {
1314                         dev->flags |= AHC_DEV_Q_TAGGED;
1315                         if (aic7xxx_periodic_otag != 0)
1316                                 dev->flags |= AHC_DEV_PERIODIC_OTAG;
1317                 } else
1318                         dev->flags |= AHC_DEV_Q_BASIC;
1319         } else {
1320                 /* We can only have one opening. */
1321                 dev->maxtags = 0;
1322                 dev->openings =  1 - dev->active;
1323         }
1324         switch ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED))) {
1325         case AHC_DEV_Q_BASIC:
1326         case AHC_DEV_Q_TAGGED:
1327                 scsi_change_queue_depth(sdev,
1328                                 dev->openings + dev->active);
1329                 break;
1330         default:
1331                 /*
1332                  * We allow the OS to queue 2 untagged transactions to
1333                  * us at any time even though we can only execute them
1334                  * serially on the controller/device.  This should
1335                  * remove some latency.
1336                  */
1337                 scsi_change_queue_depth(sdev, 2);
1338                 break;
1339         }
1340 }
1341
1342 int
1343 ahc_platform_abort_scbs(struct ahc_softc *ahc, int target, char channel,
1344                         int lun, u_int tag, role_t role, uint32_t status)
1345 {
1346         return 0;
1347 }
1348
1349 static u_int
1350 ahc_linux_user_tagdepth(struct ahc_softc *ahc, struct ahc_devinfo *devinfo)
1351 {
1352         static int warned_user;
1353         u_int tags;
1354
1355         tags = 0;
1356         if ((ahc->user_discenable & devinfo->target_mask) != 0) {
1357                 if (ahc->unit >= ARRAY_SIZE(aic7xxx_tag_info)) {
1358                         if (warned_user == 0) {
1359
1360                                 printk(KERN_WARNING
1361 "aic7xxx: WARNING: Insufficient tag_info instances\n"
1362 "aic7xxx: for installed controllers. Using defaults\n"
1363 "aic7xxx: Please update the aic7xxx_tag_info array in\n"
1364 "aic7xxx: the aic7xxx_osm..c source file.\n");
1365                                 warned_user++;
1366                         }
1367                         tags = AHC_MAX_QUEUE;
1368                 } else {
1369                         adapter_tag_info_t *tag_info;
1370
1371                         tag_info = &aic7xxx_tag_info[ahc->unit];
1372                         tags = tag_info->tag_commands[devinfo->target_offset];
1373                         if (tags > AHC_MAX_QUEUE)
1374                                 tags = AHC_MAX_QUEUE;
1375                 }
1376         }
1377         return (tags);
1378 }
1379
1380 /*
1381  * Determines the queue depth for a given device.
1382  */
1383 static void
1384 ahc_linux_device_queue_depth(struct scsi_device *sdev)
1385 {
1386         struct  ahc_devinfo devinfo;
1387         u_int   tags;
1388         struct ahc_softc *ahc = *((struct ahc_softc **)sdev->host->hostdata);
1389
1390         ahc_compile_devinfo(&devinfo,
1391                             sdev->sdev_target->channel == 0
1392                           ? ahc->our_id : ahc->our_id_b,
1393                             sdev->sdev_target->id, sdev->lun,
1394                             sdev->sdev_target->channel == 0 ? 'A' : 'B',
1395                             ROLE_INITIATOR);
1396         tags = ahc_linux_user_tagdepth(ahc, &devinfo);
1397         if (tags != 0 && sdev->tagged_supported != 0) {
1398
1399                 ahc_platform_set_tags(ahc, sdev, &devinfo, AHC_QUEUE_TAGGED);
1400                 ahc_send_async(ahc, devinfo.channel, devinfo.target,
1401                                devinfo.lun, AC_TRANSFER_NEG);
1402                 ahc_print_devinfo(ahc, &devinfo);
1403                 printk("Tagged Queuing enabled.  Depth %d\n", tags);
1404         } else {
1405                 ahc_platform_set_tags(ahc, sdev, &devinfo, AHC_QUEUE_NONE);
1406                 ahc_send_async(ahc, devinfo.channel, devinfo.target,
1407                                devinfo.lun, AC_TRANSFER_NEG);
1408         }
1409 }
1410
1411 static int
1412 ahc_linux_run_command(struct ahc_softc *ahc, struct ahc_linux_device *dev,
1413                       struct scsi_cmnd *cmd)
1414 {
1415         struct   scb *scb;
1416         struct   hardware_scb *hscb;
1417         struct   ahc_initiator_tinfo *tinfo;
1418         struct   ahc_tmode_tstate *tstate;
1419         uint16_t mask;
1420         struct scb_tailq *untagged_q = NULL;
1421         int nseg;
1422
1423         /*
1424          * Schedule us to run later.  The only reason we are not
1425          * running is because the whole controller Q is frozen.
1426          */
1427         if (ahc->platform_data->qfrozen != 0)
1428                 return SCSI_MLQUEUE_HOST_BUSY;
1429
1430         /*
1431          * We only allow one untagged transaction
1432          * per target in the initiator role unless
1433          * we are storing a full busy target *lun*
1434          * table in SCB space.
1435          */
1436         if (!(cmd->flags & SCMD_TAGGED)
1437             && (ahc->features & AHC_SCB_BTT) == 0) {
1438                 int target_offset;
1439
1440                 target_offset = cmd->device->id + cmd->device->channel * 8;
1441                 untagged_q = &(ahc->untagged_queues[target_offset]);
1442                 if (!TAILQ_EMPTY(untagged_q))
1443                         /* if we're already executing an untagged command
1444                          * we're busy to another */
1445                         return SCSI_MLQUEUE_DEVICE_BUSY;
1446         }
1447
1448         nseg = scsi_dma_map(cmd);
1449         if (nseg < 0)
1450                 return SCSI_MLQUEUE_HOST_BUSY;
1451
1452         /*
1453          * Get an scb to use.
1454          */
1455         scb = ahc_get_scb(ahc);
1456         if (!scb) {
1457                 scsi_dma_unmap(cmd);
1458                 return SCSI_MLQUEUE_HOST_BUSY;
1459         }
1460
1461         scb->io_ctx = cmd;
1462         scb->platform_data->dev = dev;
1463         hscb = scb->hscb;
1464         cmd->host_scribble = (char *)scb;
1465
1466         /*
1467          * Fill out basics of the HSCB.
1468          */
1469         hscb->control = 0;
1470         hscb->scsiid = BUILD_SCSIID(ahc, cmd);
1471         hscb->lun = cmd->device->lun;
1472         mask = SCB_GET_TARGET_MASK(ahc, scb);
1473         tinfo = ahc_fetch_transinfo(ahc, SCB_GET_CHANNEL(ahc, scb),
1474                                     SCB_GET_OUR_ID(scb),
1475                                     SCB_GET_TARGET(ahc, scb), &tstate);
1476         hscb->scsirate = tinfo->scsirate;
1477         hscb->scsioffset = tinfo->curr.offset;
1478         if ((tstate->ultraenb & mask) != 0)
1479                 hscb->control |= ULTRAENB;
1480
1481         if ((ahc->user_discenable & mask) != 0)
1482                 hscb->control |= DISCENB;
1483
1484         if ((tstate->auto_negotiate & mask) != 0) {
1485                 scb->flags |= SCB_AUTO_NEGOTIATE;
1486                 scb->hscb->control |= MK_MESSAGE;
1487         }
1488
1489         if ((dev->flags & (AHC_DEV_Q_TAGGED|AHC_DEV_Q_BASIC)) != 0) {
1490                 if (dev->commands_since_idle_or_otag == AHC_OTAG_THRESH
1491                                 && (dev->flags & AHC_DEV_Q_TAGGED) != 0) {
1492                         hscb->control |= MSG_ORDERED_TASK;
1493                         dev->commands_since_idle_or_otag = 0;
1494                 } else {
1495                         hscb->control |= MSG_SIMPLE_TASK;
1496                 }
1497         }
1498
1499         hscb->cdb_len = cmd->cmd_len;
1500         if (hscb->cdb_len <= 12) {
1501                 memcpy(hscb->shared_data.cdb, cmd->cmnd, hscb->cdb_len);
1502         } else {
1503                 memcpy(hscb->cdb32, cmd->cmnd, hscb->cdb_len);
1504                 scb->flags |= SCB_CDB32_PTR;
1505         }
1506
1507         scb->platform_data->xfer_len = 0;
1508         ahc_set_residual(scb, 0);
1509         ahc_set_sense_residual(scb, 0);
1510         scb->sg_count = 0;
1511
1512         if (nseg > 0) {
1513                 struct  ahc_dma_seg *sg;
1514                 struct  scatterlist *cur_seg;
1515                 int i;
1516
1517                 /* Copy the segments into the SG list. */
1518                 sg = scb->sg_list;
1519                 /*
1520                  * The sg_count may be larger than nseg if
1521                  * a transfer crosses a 32bit page.
1522                  */
1523                 scsi_for_each_sg(cmd, cur_seg, nseg, i) {
1524                         dma_addr_t addr;
1525                         bus_size_t len;
1526                         int consumed;
1527
1528                         addr = sg_dma_address(cur_seg);
1529                         len = sg_dma_len(cur_seg);
1530                         consumed = ahc_linux_map_seg(ahc, scb,
1531                                                      sg, addr, len);
1532                         sg += consumed;
1533                         scb->sg_count += consumed;
1534                 }
1535                 sg--;
1536                 sg->len |= ahc_htole32(AHC_DMA_LAST_SEG);
1537
1538                 /*
1539                  * Reset the sg list pointer.
1540                  */
1541                 scb->hscb->sgptr =
1542                         ahc_htole32(scb->sg_list_phys | SG_FULL_RESID);
1543
1544                 /*
1545                  * Copy the first SG into the "current"
1546                  * data pointer area.
1547                  */
1548                 scb->hscb->dataptr = scb->sg_list->addr;
1549                 scb->hscb->datacnt = scb->sg_list->len;
1550         } else {
1551                 scb->hscb->sgptr = ahc_htole32(SG_LIST_NULL);
1552                 scb->hscb->dataptr = 0;
1553                 scb->hscb->datacnt = 0;
1554                 scb->sg_count = 0;
1555         }
1556
1557         LIST_INSERT_HEAD(&ahc->pending_scbs, scb, pending_links);
1558         dev->openings--;
1559         dev->active++;
1560         dev->commands_issued++;
1561         if ((dev->flags & AHC_DEV_PERIODIC_OTAG) != 0)
1562                 dev->commands_since_idle_or_otag++;
1563
1564         scb->flags |= SCB_ACTIVE;
1565         if (untagged_q) {
1566                 TAILQ_INSERT_TAIL(untagged_q, scb, links.tqe);
1567                 scb->flags |= SCB_UNTAGGEDQ;
1568         }
1569         ahc_queue_scb(ahc, scb);
1570         return 0;
1571 }
1572
1573 /*
1574  * SCSI controller interrupt handler.
1575  */
1576 irqreturn_t
1577 ahc_linux_isr(int irq, void *dev_id)
1578 {
1579         struct  ahc_softc *ahc;
1580         u_long  flags;
1581         int     ours;
1582
1583         ahc = (struct ahc_softc *) dev_id;
1584         ahc_lock(ahc, &flags);
1585         ours = ahc_intr(ahc);
1586         ahc_unlock(ahc, &flags);
1587         return IRQ_RETVAL(ours);
1588 }
1589
1590 void
1591 ahc_platform_flushwork(struct ahc_softc *ahc)
1592 {
1593
1594 }
1595
1596 void
1597 ahc_send_async(struct ahc_softc *ahc, char channel,
1598                u_int target, u_int lun, ac_code code)
1599 {
1600         switch (code) {
1601         case AC_TRANSFER_NEG:
1602         {
1603                 struct  scsi_target *starget;
1604                 struct  ahc_linux_target *targ;
1605                 struct  ahc_initiator_tinfo *tinfo;
1606                 struct  ahc_tmode_tstate *tstate;
1607                 int     target_offset;
1608                 unsigned int target_ppr_options;
1609
1610                 BUG_ON(target == CAM_TARGET_WILDCARD);
1611
1612                 tinfo = ahc_fetch_transinfo(ahc, channel,
1613                                                 channel == 'A' ? ahc->our_id
1614                                                                : ahc->our_id_b,
1615                                                 target, &tstate);
1616
1617                 /*
1618                  * Don't bother reporting results while
1619                  * negotiations are still pending.
1620                  */
1621                 if (tinfo->curr.period != tinfo->goal.period
1622                  || tinfo->curr.width != tinfo->goal.width
1623                  || tinfo->curr.offset != tinfo->goal.offset
1624                  || tinfo->curr.ppr_options != tinfo->goal.ppr_options)
1625                         if (bootverbose == 0)
1626                                 break;
1627
1628                 /*
1629                  * Don't bother reporting results that
1630                  * are identical to those last reported.
1631                  */
1632                 target_offset = target;
1633                 if (channel == 'B')
1634                         target_offset += 8;
1635                 starget = ahc->platform_data->starget[target_offset];
1636                 if (starget == NULL)
1637                         break;
1638                 targ = scsi_transport_target_data(starget);
1639
1640                 target_ppr_options =
1641                         (spi_dt(starget) ? MSG_EXT_PPR_DT_REQ : 0)
1642                         + (spi_qas(starget) ? MSG_EXT_PPR_QAS_REQ : 0)
1643                         + (spi_iu(starget) ?  MSG_EXT_PPR_IU_REQ : 0);
1644
1645                 if (tinfo->curr.period == spi_period(starget)
1646                     && tinfo->curr.width == spi_width(starget)
1647                     && tinfo->curr.offset == spi_offset(starget)
1648                  && tinfo->curr.ppr_options == target_ppr_options)
1649                         if (bootverbose == 0)
1650                                 break;
1651
1652                 spi_period(starget) = tinfo->curr.period;
1653                 spi_width(starget) = tinfo->curr.width;
1654                 spi_offset(starget) = tinfo->curr.offset;
1655                 spi_dt(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_DT_REQ ? 1 : 0;
1656                 spi_qas(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_QAS_REQ ? 1 : 0;
1657                 spi_iu(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ ? 1 : 0;
1658                 spi_display_xfer_agreement(starget);
1659                 break;
1660         }
1661         case AC_SENT_BDR:
1662         {
1663                 WARN_ON(lun != CAM_LUN_WILDCARD);
1664                 scsi_report_device_reset(ahc->platform_data->host,
1665                                          channel - 'A', target);
1666                 break;
1667         }
1668         case AC_BUS_RESET:
1669                 if (ahc->platform_data->host != NULL) {
1670                         scsi_report_bus_reset(ahc->platform_data->host,
1671                                               channel - 'A');
1672                 }
1673                 break;
1674         default:
1675                 panic("ahc_send_async: Unexpected async event");
1676         }
1677 }
1678
1679 /*
1680  * Calls the higher level scsi done function and frees the scb.
1681  */
1682 void
1683 ahc_done(struct ahc_softc *ahc, struct scb *scb)
1684 {
1685         struct scsi_cmnd *cmd;
1686         struct     ahc_linux_device *dev;
1687
1688         LIST_REMOVE(scb, pending_links);
1689         if ((scb->flags & SCB_UNTAGGEDQ) != 0) {
1690                 struct scb_tailq *untagged_q;
1691                 int target_offset;
1692
1693                 target_offset = SCB_GET_TARGET_OFFSET(ahc, scb);
1694                 untagged_q = &(ahc->untagged_queues[target_offset]);
1695                 TAILQ_REMOVE(untagged_q, scb, links.tqe);
1696                 BUG_ON(!TAILQ_EMPTY(untagged_q));
1697         } else if ((scb->flags & SCB_ACTIVE) == 0) {
1698                 /*
1699                  * Transactions aborted from the untagged queue may
1700                  * not have been dispatched to the controller, so
1701                  * only check the SCB_ACTIVE flag for tagged transactions.
1702                  */
1703                 printk("SCB %d done'd twice\n", scb->hscb->tag);
1704                 ahc_dump_card_state(ahc);
1705                 panic("Stopping for safety");
1706         }
1707         cmd = scb->io_ctx;
1708         dev = scb->platform_data->dev;
1709         dev->active--;
1710         dev->openings++;
1711         if ((cmd->result & (CAM_DEV_QFRZN << 16)) != 0) {
1712                 cmd->result &= ~(CAM_DEV_QFRZN << 16);
1713                 dev->qfrozen--;
1714         }
1715         ahc_linux_unmap_scb(ahc, scb);
1716
1717         /*
1718          * Guard against stale sense data.
1719          * The Linux mid-layer assumes that sense
1720          * was retrieved anytime the first byte of
1721          * the sense buffer looks "sane".
1722          */
1723         cmd->sense_buffer[0] = 0;
1724         if (ahc_get_transaction_status(scb) == CAM_REQ_INPROG) {
1725                 uint32_t amount_xferred;
1726
1727                 amount_xferred =
1728                     ahc_get_transfer_length(scb) - ahc_get_residual(scb);
1729                 if ((scb->flags & SCB_TRANSMISSION_ERROR) != 0) {
1730 #ifdef AHC_DEBUG
1731                         if ((ahc_debug & AHC_SHOW_MISC) != 0) {
1732                                 ahc_print_path(ahc, scb);
1733                                 printk("Set CAM_UNCOR_PARITY\n");
1734                         }
1735 #endif
1736                         ahc_set_transaction_status(scb, CAM_UNCOR_PARITY);
1737 #ifdef AHC_REPORT_UNDERFLOWS
1738                 /*
1739                  * This code is disabled by default as some
1740                  * clients of the SCSI system do not properly
1741                  * initialize the underflow parameter.  This
1742                  * results in spurious termination of commands
1743                  * that complete as expected (e.g. underflow is
1744                  * allowed as command can return variable amounts
1745                  * of data.
1746                  */
1747                 } else if (amount_xferred < scb->io_ctx->underflow) {
1748                         u_int i;
1749
1750                         ahc_print_path(ahc, scb);
1751                         printk("CDB:");
1752                         for (i = 0; i < scb->io_ctx->cmd_len; i++)
1753                                 printk(" 0x%x", scb->io_ctx->cmnd[i]);
1754                         printk("\n");
1755                         ahc_print_path(ahc, scb);
1756                         printk("Saw underflow (%ld of %ld bytes). "
1757                                "Treated as error\n",
1758                                 ahc_get_residual(scb),
1759                                 ahc_get_transfer_length(scb));
1760                         ahc_set_transaction_status(scb, CAM_DATA_RUN_ERR);
1761 #endif
1762                 } else {
1763                         ahc_set_transaction_status(scb, CAM_REQ_CMP);
1764                 }
1765         } else if (ahc_get_transaction_status(scb) == CAM_SCSI_STATUS_ERROR) {
1766                 ahc_linux_handle_scsi_status(ahc, cmd->device, scb);
1767         }
1768
1769         if (dev->openings == 1
1770          && ahc_get_transaction_status(scb) == CAM_REQ_CMP
1771          && ahc_get_scsi_status(scb) != SCSI_STATUS_QUEUE_FULL)
1772                 dev->tag_success_count++;
1773         /*
1774          * Some devices deal with temporary internal resource
1775          * shortages by returning queue full.  When the queue
1776          * full occurrs, we throttle back.  Slowly try to get
1777          * back to our previous queue depth.
1778          */
1779         if ((dev->openings + dev->active) < dev->maxtags
1780          && dev->tag_success_count > AHC_TAG_SUCCESS_INTERVAL) {
1781                 dev->tag_success_count = 0;
1782                 dev->openings++;
1783         }
1784
1785         if (dev->active == 0)
1786                 dev->commands_since_idle_or_otag = 0;
1787
1788         if ((scb->flags & SCB_RECOVERY_SCB) != 0) {
1789                 printk("Recovery SCB completes\n");
1790                 if (ahc_get_transaction_status(scb) == CAM_BDR_SENT
1791                  || ahc_get_transaction_status(scb) == CAM_REQ_ABORTED)
1792                         ahc_set_transaction_status(scb, CAM_CMD_TIMEOUT);
1793
1794                 if (ahc->platform_data->eh_done)
1795                         complete(ahc->platform_data->eh_done);
1796         }
1797
1798         ahc_free_scb(ahc, scb);
1799         ahc_linux_queue_cmd_complete(ahc, cmd);
1800 }
1801
1802 static void
1803 ahc_linux_handle_scsi_status(struct ahc_softc *ahc,
1804                              struct scsi_device *sdev, struct scb *scb)
1805 {
1806         struct  ahc_devinfo devinfo;
1807         struct ahc_linux_device *dev = scsi_transport_device_data(sdev);
1808
1809         ahc_compile_devinfo(&devinfo,
1810                             ahc->our_id,
1811                             sdev->sdev_target->id, sdev->lun,
1812                             sdev->sdev_target->channel == 0 ? 'A' : 'B',
1813                             ROLE_INITIATOR);
1814
1815         /*
1816          * We don't currently trust the mid-layer to
1817          * properly deal with queue full or busy.  So,
1818          * when one occurs, we tell the mid-layer to
1819          * unconditionally requeue the command to us
1820          * so that we can retry it ourselves.  We also
1821          * implement our own throttling mechanism so
1822          * we don't clobber the device with too many
1823          * commands.
1824          */
1825         switch (ahc_get_scsi_status(scb)) {
1826         default:
1827                 break;
1828         case SCSI_STATUS_CHECK_COND:
1829         case SCSI_STATUS_CMD_TERMINATED:
1830         {
1831                 struct scsi_cmnd *cmd;
1832
1833                 /*
1834                  * Copy sense information to the OS's cmd
1835                  * structure if it is available.
1836                  */
1837                 cmd = scb->io_ctx;
1838                 if (scb->flags & SCB_SENSE) {
1839                         u_int sense_size;
1840
1841                         sense_size = min(sizeof(struct scsi_sense_data)
1842                                        - ahc_get_sense_residual(scb),
1843                                          (u_long)SCSI_SENSE_BUFFERSIZE);
1844                         memcpy(cmd->sense_buffer,
1845                                ahc_get_sense_buf(ahc, scb), sense_size);
1846                         if (sense_size < SCSI_SENSE_BUFFERSIZE)
1847                                 memset(&cmd->sense_buffer[sense_size], 0,
1848                                        SCSI_SENSE_BUFFERSIZE - sense_size);
1849                         cmd->result |= (DRIVER_SENSE << 24);
1850 #ifdef AHC_DEBUG
1851                         if (ahc_debug & AHC_SHOW_SENSE) {
1852                                 int i;
1853
1854                                 printk("Copied %d bytes of sense data:",
1855                                        sense_size);
1856                                 for (i = 0; i < sense_size; i++) {
1857                                         if ((i & 0xF) == 0)
1858                                                 printk("\n");
1859                                         printk("0x%x ", cmd->sense_buffer[i]);
1860                                 }
1861                                 printk("\n");
1862                         }
1863 #endif
1864                 }
1865                 break;
1866         }
1867         case SCSI_STATUS_QUEUE_FULL:
1868         {
1869                 /*
1870                  * By the time the core driver has returned this
1871                  * command, all other commands that were queued
1872                  * to us but not the device have been returned.
1873                  * This ensures that dev->active is equal to
1874                  * the number of commands actually queued to
1875                  * the device.
1876                  */
1877                 dev->tag_success_count = 0;
1878                 if (dev->active != 0) {
1879                         /*
1880                          * Drop our opening count to the number
1881                          * of commands currently outstanding.
1882                          */
1883                         dev->openings = 0;
1884 /*
1885                         ahc_print_path(ahc, scb);
1886                         printk("Dropping tag count to %d\n", dev->active);
1887  */
1888                         if (dev->active == dev->tags_on_last_queuefull) {
1889
1890                                 dev->last_queuefull_same_count++;
1891                                 /*
1892                                  * If we repeatedly see a queue full
1893                                  * at the same queue depth, this
1894                                  * device has a fixed number of tag
1895                                  * slots.  Lock in this tag depth
1896                                  * so we stop seeing queue fulls from
1897                                  * this device.
1898                                  */
1899                                 if (dev->last_queuefull_same_count
1900                                  == AHC_LOCK_TAGS_COUNT) {
1901                                         dev->maxtags = dev->active;
1902                                         ahc_print_path(ahc, scb);
1903                                         printk("Locking max tag count at %d\n",
1904                                                dev->active);
1905                                 }
1906                         } else {
1907                                 dev->tags_on_last_queuefull = dev->active;
1908                                 dev->last_queuefull_same_count = 0;
1909                         }
1910                         ahc_set_transaction_status(scb, CAM_REQUEUE_REQ);
1911                         ahc_set_scsi_status(scb, SCSI_STATUS_OK);
1912                         ahc_platform_set_tags(ahc, sdev, &devinfo,
1913                                      (dev->flags & AHC_DEV_Q_BASIC)
1914                                    ? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
1915                         break;
1916                 }
1917                 /*
1918                  * Drop down to a single opening, and treat this
1919                  * as if the target returned BUSY SCSI status.
1920                  */
1921                 dev->openings = 1;
1922                 ahc_set_scsi_status(scb, SCSI_STATUS_BUSY);
1923                 ahc_platform_set_tags(ahc, sdev, &devinfo,
1924                              (dev->flags & AHC_DEV_Q_BASIC)
1925                            ? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
1926                 break;
1927         }
1928         }
1929 }
1930
1931 static void
1932 ahc_linux_queue_cmd_complete(struct ahc_softc *ahc, struct scsi_cmnd *cmd)
1933 {
1934         /*
1935          * Map CAM error codes into Linux Error codes.  We
1936          * avoid the conversion so that the DV code has the
1937          * full error information available when making
1938          * state change decisions.
1939          */
1940         {
1941                 u_int new_status;
1942
1943                 switch (ahc_cmd_get_transaction_status(cmd)) {
1944                 case CAM_REQ_INPROG:
1945                 case CAM_REQ_CMP:
1946                 case CAM_SCSI_STATUS_ERROR:
1947                         new_status = DID_OK;
1948                         break;
1949                 case CAM_REQ_ABORTED:
1950                         new_status = DID_ABORT;
1951                         break;
1952                 case CAM_BUSY:
1953                         new_status = DID_BUS_BUSY;
1954                         break;
1955                 case CAM_REQ_INVALID:
1956                 case CAM_PATH_INVALID:
1957                         new_status = DID_BAD_TARGET;
1958                         break;
1959                 case CAM_SEL_TIMEOUT:
1960                         new_status = DID_NO_CONNECT;
1961                         break;
1962                 case CAM_SCSI_BUS_RESET:
1963                 case CAM_BDR_SENT:
1964                         new_status = DID_RESET;
1965                         break;
1966                 case CAM_UNCOR_PARITY:
1967                         new_status = DID_PARITY;
1968                         break;
1969                 case CAM_CMD_TIMEOUT:
1970                         new_status = DID_TIME_OUT;
1971                         break;
1972                 case CAM_UA_ABORT:
1973                 case CAM_REQ_CMP_ERR:
1974                 case CAM_AUTOSENSE_FAIL:
1975                 case CAM_NO_HBA:
1976                 case CAM_DATA_RUN_ERR:
1977                 case CAM_UNEXP_BUSFREE:
1978                 case CAM_SEQUENCE_FAIL:
1979                 case CAM_CCB_LEN_ERR:
1980                 case CAM_PROVIDE_FAIL:
1981                 case CAM_REQ_TERMIO:
1982                 case CAM_UNREC_HBA_ERROR:
1983                 case CAM_REQ_TOO_BIG:
1984                         new_status = DID_ERROR;
1985                         break;
1986                 case CAM_REQUEUE_REQ:
1987                         new_status = DID_REQUEUE;
1988                         break;
1989                 default:
1990                         /* We should never get here */
1991                         new_status = DID_ERROR;
1992                         break;
1993                 }
1994
1995                 ahc_cmd_set_transaction_status(cmd, new_status);
1996         }
1997
1998         cmd->scsi_done(cmd);
1999 }
2000
2001 static void
2002 ahc_linux_freeze_simq(struct ahc_softc *ahc)
2003 {
2004         unsigned long s;
2005
2006         ahc_lock(ahc, &s);
2007         ahc->platform_data->qfrozen++;
2008         if (ahc->platform_data->qfrozen == 1) {
2009                 scsi_block_requests(ahc->platform_data->host);
2010
2011                 /* XXX What about Twin channels? */
2012                 ahc_platform_abort_scbs(ahc, CAM_TARGET_WILDCARD, ALL_CHANNELS,
2013                                         CAM_LUN_WILDCARD, SCB_LIST_NULL,
2014                                         ROLE_INITIATOR, CAM_REQUEUE_REQ);
2015         }
2016         ahc_unlock(ahc, &s);
2017 }
2018
2019 static void
2020 ahc_linux_release_simq(struct ahc_softc *ahc)
2021 {
2022         u_long s;
2023         int    unblock_reqs;
2024
2025         unblock_reqs = 0;
2026         ahc_lock(ahc, &s);
2027         if (ahc->platform_data->qfrozen > 0)
2028                 ahc->platform_data->qfrozen--;
2029         if (ahc->platform_data->qfrozen == 0)
2030                 unblock_reqs = 1;
2031         ahc_unlock(ahc, &s);
2032         /*
2033          * There is still a race here.  The mid-layer
2034          * should keep its own freeze count and use
2035          * a bottom half handler to run the queues
2036          * so we can unblock with our own lock held.
2037          */
2038         if (unblock_reqs)
2039                 scsi_unblock_requests(ahc->platform_data->host);
2040 }
2041
2042 static int
2043 ahc_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag)
2044 {
2045         struct ahc_softc *ahc;
2046         struct ahc_linux_device *dev;
2047         struct scb *pending_scb;
2048         u_int  saved_scbptr;
2049         u_int  active_scb_index;
2050         u_int  last_phase;
2051         u_int  saved_scsiid;
2052         u_int  cdb_byte;
2053         int    retval;
2054         int    was_paused;
2055         int    paused;
2056         int    wait;
2057         int    disconnected;
2058         unsigned long flags;
2059
2060         pending_scb = NULL;
2061         paused = FALSE;
2062         wait = FALSE;
2063         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
2064
2065         scmd_printk(KERN_INFO, cmd, "Attempting to queue a%s message\n",
2066                flag == SCB_ABORT ? "n ABORT" : " TARGET RESET");
2067
2068         printk("CDB:");
2069         for (cdb_byte = 0; cdb_byte < cmd->cmd_len; cdb_byte++)
2070                 printk(" 0x%x", cmd->cmnd[cdb_byte]);
2071         printk("\n");
2072
2073         ahc_lock(ahc, &flags);
2074
2075         /*
2076          * First determine if we currently own this command.
2077          * Start by searching the device queue.  If not found
2078          * there, check the pending_scb list.  If not found
2079          * at all, and the system wanted us to just abort the
2080          * command, return success.
2081          */
2082         dev = scsi_transport_device_data(cmd->device);
2083
2084         if (dev == NULL) {
2085                 /*
2086                  * No target device for this command exists,
2087                  * so we must not still own the command.
2088                  */
2089                 printk("%s:%d:%d:%d: Is not an active device\n",
2090                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2091                        (u8)cmd->device->lun);
2092                 retval = SUCCESS;
2093                 goto no_cmd;
2094         }
2095
2096         if ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED)) == 0
2097          && ahc_search_untagged_queues(ahc, cmd, cmd->device->id,
2098                                        cmd->device->channel + 'A',
2099                                        (u8)cmd->device->lun,
2100                                        CAM_REQ_ABORTED, SEARCH_COMPLETE) != 0) {
2101                 printk("%s:%d:%d:%d: Command found on untagged queue\n",
2102                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2103                        (u8)cmd->device->lun);
2104                 retval = SUCCESS;
2105                 goto done;
2106         }
2107
2108         /*
2109          * See if we can find a matching cmd in the pending list.
2110          */
2111         LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
2112                 if (pending_scb->io_ctx == cmd)
2113                         break;
2114         }
2115
2116         if (pending_scb == NULL && flag == SCB_DEVICE_RESET) {
2117
2118                 /* Any SCB for this device will do for a target reset */
2119                 LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
2120                         if (ahc_match_scb(ahc, pending_scb, scmd_id(cmd),
2121                                           scmd_channel(cmd) + 'A',
2122                                           CAM_LUN_WILDCARD,
2123                                           SCB_LIST_NULL, ROLE_INITIATOR))
2124                                 break;
2125                 }
2126         }
2127
2128         if (pending_scb == NULL) {
2129                 scmd_printk(KERN_INFO, cmd, "Command not found\n");
2130                 goto no_cmd;
2131         }
2132
2133         if ((pending_scb->flags & SCB_RECOVERY_SCB) != 0) {
2134                 /*
2135                  * We can't queue two recovery actions using the same SCB
2136                  */
2137                 retval = FAILED;
2138                 goto  done;
2139         }
2140
2141         /*
2142          * Ensure that the card doesn't do anything
2143          * behind our back and that we didn't "just" miss
2144          * an interrupt that would affect this cmd.
2145          */
2146         was_paused = ahc_is_paused(ahc);
2147         ahc_pause_and_flushwork(ahc);
2148         paused = TRUE;
2149
2150         if ((pending_scb->flags & SCB_ACTIVE) == 0) {
2151                 scmd_printk(KERN_INFO, cmd, "Command already completed\n");
2152                 goto no_cmd;
2153         }
2154
2155         printk("%s: At time of recovery, card was %spaused\n",
2156                ahc_name(ahc), was_paused ? "" : "not ");
2157         ahc_dump_card_state(ahc);
2158
2159         disconnected = TRUE;
2160         if (flag == SCB_ABORT) {
2161                 if (ahc_search_qinfifo(ahc, cmd->device->id,
2162                                        cmd->device->channel + 'A',
2163                                        cmd->device->lun,
2164                                        pending_scb->hscb->tag,
2165                                        ROLE_INITIATOR, CAM_REQ_ABORTED,
2166                                        SEARCH_COMPLETE) > 0) {
2167                         printk("%s:%d:%d:%d: Cmd aborted from QINFIFO\n",
2168                                ahc_name(ahc), cmd->device->channel,
2169                                cmd->device->id, (u8)cmd->device->lun);
2170                         retval = SUCCESS;
2171                         goto done;
2172                 }
2173         } else if (ahc_search_qinfifo(ahc, cmd->device->id,
2174                                       cmd->device->channel + 'A',
2175                                       cmd->device->lun,
2176                                       pending_scb->hscb->tag,
2177                                       ROLE_INITIATOR, /*status*/0,
2178                                       SEARCH_COUNT) > 0) {
2179                 disconnected = FALSE;
2180         }
2181
2182         if (disconnected && (ahc_inb(ahc, SEQ_FLAGS) & NOT_IDENTIFIED) == 0) {
2183                 struct scb *bus_scb;
2184
2185                 bus_scb = ahc_lookup_scb(ahc, ahc_inb(ahc, SCB_TAG));
2186                 if (bus_scb == pending_scb)
2187                         disconnected = FALSE;
2188                 else if (flag != SCB_ABORT
2189                       && ahc_inb(ahc, SAVED_SCSIID) == pending_scb->hscb->scsiid
2190                       && ahc_inb(ahc, SAVED_LUN) == SCB_GET_LUN(pending_scb))
2191                         disconnected = FALSE;
2192         }
2193
2194         /*
2195          * At this point, pending_scb is the scb associated with the
2196          * passed in command.  That command is currently active on the
2197          * bus, is in the disconnected state, or we're hoping to find
2198          * a command for the same target active on the bus to abuse to
2199          * send a BDR.  Queue the appropriate message based on which of
2200          * these states we are in.
2201          */
2202         last_phase = ahc_inb(ahc, LASTPHASE);
2203         saved_scbptr = ahc_inb(ahc, SCBPTR);
2204         active_scb_index = ahc_inb(ahc, SCB_TAG);
2205         saved_scsiid = ahc_inb(ahc, SAVED_SCSIID);
2206         if (last_phase != P_BUSFREE
2207          && (pending_scb->hscb->tag == active_scb_index
2208           || (flag == SCB_DEVICE_RESET
2209            && SCSIID_TARGET(ahc, saved_scsiid) == scmd_id(cmd)))) {
2210
2211                 /*
2212                  * We're active on the bus, so assert ATN
2213                  * and hope that the target responds.
2214                  */
2215                 pending_scb = ahc_lookup_scb(ahc, active_scb_index);
2216                 pending_scb->flags |= SCB_RECOVERY_SCB|flag;
2217                 ahc_outb(ahc, MSG_OUT, HOST_MSG);
2218                 ahc_outb(ahc, SCSISIGO, last_phase|ATNO);
2219                 scmd_printk(KERN_INFO, cmd, "Device is active, asserting ATN\n");
2220                 wait = TRUE;
2221         } else if (disconnected) {
2222
2223                 /*
2224                  * Actually re-queue this SCB in an attempt
2225                  * to select the device before it reconnects.
2226                  * In either case (selection or reselection),
2227                  * we will now issue the approprate message
2228                  * to the timed-out device.
2229                  *
2230                  * Set the MK_MESSAGE control bit indicating
2231                  * that we desire to send a message.  We
2232                  * also set the disconnected flag since
2233                  * in the paging case there is no guarantee
2234                  * that our SCB control byte matches the
2235                  * version on the card.  We don't want the
2236                  * sequencer to abort the command thinking
2237                  * an unsolicited reselection occurred.
2238                  */
2239                 pending_scb->hscb->control |= MK_MESSAGE|DISCONNECTED;
2240                 pending_scb->flags |= SCB_RECOVERY_SCB|flag;
2241
2242                 /*
2243                  * Remove any cached copy of this SCB in the
2244                  * disconnected list in preparation for the
2245                  * queuing of our abort SCB.  We use the
2246                  * same element in the SCB, SCB_NEXT, for
2247                  * both the qinfifo and the disconnected list.
2248                  */
2249                 ahc_search_disc_list(ahc, cmd->device->id,
2250                                      cmd->device->channel + 'A',
2251                                      cmd->device->lun, pending_scb->hscb->tag,
2252                                      /*stop_on_first*/TRUE,
2253                                      /*remove*/TRUE,
2254                                      /*save_state*/FALSE);
2255
2256                 /*
2257                  * In the non-paging case, the sequencer will
2258                  * never re-reference the in-core SCB.
2259                  * To make sure we are notified during
2260                  * reselection, set the MK_MESSAGE flag in
2261                  * the card's copy of the SCB.
2262                  */
2263                 if ((ahc->flags & AHC_PAGESCBS) == 0) {
2264                         ahc_outb(ahc, SCBPTR, pending_scb->hscb->tag);
2265                         ahc_outb(ahc, SCB_CONTROL,
2266                                  ahc_inb(ahc, SCB_CONTROL)|MK_MESSAGE);
2267                 }
2268
2269                 /*
2270                  * Clear out any entries in the QINFIFO first
2271                  * so we are the next SCB for this target
2272                  * to run.
2273                  */
2274                 ahc_search_qinfifo(ahc, cmd->device->id,
2275                                    cmd->device->channel + 'A',
2276                                    cmd->device->lun, SCB_LIST_NULL,
2277                                    ROLE_INITIATOR, CAM_REQUEUE_REQ,
2278                                    SEARCH_COMPLETE);
2279                 ahc_qinfifo_requeue_tail(ahc, pending_scb);
2280                 ahc_outb(ahc, SCBPTR, saved_scbptr);
2281                 ahc_print_path(ahc, pending_scb);
2282                 printk("Device is disconnected, re-queuing SCB\n");
2283                 wait = TRUE;
2284         } else {
2285                 scmd_printk(KERN_INFO, cmd, "Unable to deliver message\n");
2286                 retval = FAILED;
2287                 goto done;
2288         }
2289
2290 no_cmd:
2291         /*
2292          * Our assumption is that if we don't have the command, no
2293          * recovery action was required, so we return success.  Again,
2294          * the semantics of the mid-layer recovery engine are not
2295          * well defined, so this may change in time.
2296          */
2297         retval = SUCCESS;
2298 done:
2299         if (paused)
2300                 ahc_unpause(ahc);
2301         if (wait) {
2302                 DECLARE_COMPLETION_ONSTACK(done);
2303
2304                 ahc->platform_data->eh_done = &done;
2305                 ahc_unlock(ahc, &flags);
2306
2307                 printk("Recovery code sleeping\n");
2308                 if (!wait_for_completion_timeout(&done, 5 * HZ)) {
2309                         ahc_lock(ahc, &flags);
2310                         ahc->platform_data->eh_done = NULL;
2311                         ahc_unlock(ahc, &flags);
2312
2313                         printk("Timer Expired\n");
2314                         retval = FAILED;
2315                 }
2316                 printk("Recovery code awake\n");
2317         } else
2318                 ahc_unlock(ahc, &flags);
2319         return (retval);
2320 }
2321
2322 static void ahc_linux_set_width(struct scsi_target *starget, int width)
2323 {
2324         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2325         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2326         struct ahc_devinfo devinfo;
2327         unsigned long flags;
2328
2329         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2330                             starget->channel + 'A', ROLE_INITIATOR);
2331         ahc_lock(ahc, &flags);
2332         ahc_set_width(ahc, &devinfo, width, AHC_TRANS_GOAL, FALSE);
2333         ahc_unlock(ahc, &flags);
2334 }
2335
2336 static void ahc_linux_set_period(struct scsi_target *starget, int period)
2337 {
2338         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2339         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2340         struct ahc_tmode_tstate *tstate;
2341         struct ahc_initiator_tinfo *tinfo
2342                 = ahc_fetch_transinfo(ahc,
2343                                       starget->channel + 'A',
2344                                       shost->this_id, starget->id, &tstate);
2345         struct ahc_devinfo devinfo;
2346         unsigned int ppr_options = tinfo->goal.ppr_options;
2347         unsigned long flags;
2348         unsigned long offset = tinfo->goal.offset;
2349         const struct ahc_syncrate *syncrate;
2350
2351         if (offset == 0)
2352                 offset = MAX_OFFSET;
2353
2354         if (period < 9)
2355                 period = 9;     /* 12.5ns is our minimum */
2356         if (period == 9) {
2357                 if (spi_max_width(starget))
2358                         ppr_options |= MSG_EXT_PPR_DT_REQ;
2359                 else
2360                         /* need wide for DT and need DT for 12.5 ns */
2361                         period = 10;
2362         }
2363
2364         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2365                             starget->channel + 'A', ROLE_INITIATOR);
2366
2367         /* all PPR requests apart from QAS require wide transfers */
2368         if (ppr_options & ~MSG_EXT_PPR_QAS_REQ) {
2369                 if (spi_width(starget) == 0)
2370                         ppr_options &= MSG_EXT_PPR_QAS_REQ;
2371         }
2372
2373         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2374         ahc_lock(ahc, &flags);
2375         ahc_set_syncrate(ahc, &devinfo, syncrate, period, offset,
2376                          ppr_options, AHC_TRANS_GOAL, FALSE);
2377         ahc_unlock(ahc, &flags);
2378 }
2379
2380 static void ahc_linux_set_offset(struct scsi_target *starget, int offset)
2381 {
2382         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2383         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2384         struct ahc_tmode_tstate *tstate;
2385         struct ahc_initiator_tinfo *tinfo
2386                 = ahc_fetch_transinfo(ahc,
2387                                       starget->channel + 'A',
2388                                       shost->this_id, starget->id, &tstate);
2389         struct ahc_devinfo devinfo;
2390         unsigned int ppr_options = 0;
2391         unsigned int period = 0;
2392         unsigned long flags;
2393         const struct ahc_syncrate *syncrate = NULL;
2394
2395         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2396                             starget->channel + 'A', ROLE_INITIATOR);
2397         if (offset != 0) {
2398                 syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2399                 period = tinfo->goal.period;
2400                 ppr_options = tinfo->goal.ppr_options;
2401         }
2402         ahc_lock(ahc, &flags);
2403         ahc_set_syncrate(ahc, &devinfo, syncrate, period, offset,
2404                          ppr_options, AHC_TRANS_GOAL, FALSE);
2405         ahc_unlock(ahc, &flags);
2406 }
2407
2408 static void ahc_linux_set_dt(struct scsi_target *starget, int dt)
2409 {
2410         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2411         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2412         struct ahc_tmode_tstate *tstate;
2413         struct ahc_initiator_tinfo *tinfo
2414                 = ahc_fetch_transinfo(ahc,
2415                                       starget->channel + 'A',
2416                                       shost->this_id, starget->id, &tstate);
2417         struct ahc_devinfo devinfo;
2418         unsigned int ppr_options = tinfo->goal.ppr_options
2419                 & ~MSG_EXT_PPR_DT_REQ;
2420         unsigned int period = tinfo->goal.period;
2421         unsigned int width = tinfo->goal.width;
2422         unsigned long flags;
2423         const struct ahc_syncrate *syncrate;
2424
2425         if (dt && spi_max_width(starget)) {
2426                 ppr_options |= MSG_EXT_PPR_DT_REQ;
2427                 if (!width)
2428                         ahc_linux_set_width(starget, 1);
2429         } else if (period == 9)
2430                 period = 10;    /* if resetting DT, period must be >= 25ns */
2431
2432         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2433                             starget->channel + 'A', ROLE_INITIATOR);
2434         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options,AHC_SYNCRATE_DT);
2435         ahc_lock(ahc, &flags);
2436         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2437                          ppr_options, AHC_TRANS_GOAL, FALSE);
2438         ahc_unlock(ahc, &flags);
2439 }
2440
2441 #if 0
2442 /* FIXME: This code claims to support IU and QAS.  However, the actual
2443  * sequencer code and aic7xxx_core have no support for these parameters and
2444  * will get into a bad state if they're negotiated.  Do not enable this
2445  * unless you know what you're doing */
2446 static void ahc_linux_set_qas(struct scsi_target *starget, int qas)
2447 {
2448         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2449         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2450         struct ahc_tmode_tstate *tstate;
2451         struct ahc_initiator_tinfo *tinfo
2452                 = ahc_fetch_transinfo(ahc,
2453                                       starget->channel + 'A',
2454                                       shost->this_id, starget->id, &tstate);
2455         struct ahc_devinfo devinfo;
2456         unsigned int ppr_options = tinfo->goal.ppr_options
2457                 & ~MSG_EXT_PPR_QAS_REQ;
2458         unsigned int period = tinfo->goal.period;
2459         unsigned long flags;
2460         struct ahc_syncrate *syncrate;
2461
2462         if (qas)
2463                 ppr_options |= MSG_EXT_PPR_QAS_REQ;
2464
2465         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2466                             starget->channel + 'A', ROLE_INITIATOR);
2467         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2468         ahc_lock(ahc, &flags);
2469         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2470                          ppr_options, AHC_TRANS_GOAL, FALSE);
2471         ahc_unlock(ahc, &flags);
2472 }
2473
2474 static void ahc_linux_set_iu(struct scsi_target *starget, int iu)
2475 {
2476         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2477         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2478         struct ahc_tmode_tstate *tstate;
2479         struct ahc_initiator_tinfo *tinfo
2480                 = ahc_fetch_transinfo(ahc,
2481                                       starget->channel + 'A',
2482                                       shost->this_id, starget->id, &tstate);
2483         struct ahc_devinfo devinfo;
2484         unsigned int ppr_options = tinfo->goal.ppr_options
2485                 & ~MSG_EXT_PPR_IU_REQ;
2486         unsigned int period = tinfo->goal.period;
2487         unsigned long flags;
2488         struct ahc_syncrate *syncrate;
2489
2490         if (iu)
2491                 ppr_options |= MSG_EXT_PPR_IU_REQ;
2492
2493         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2494                             starget->channel + 'A', ROLE_INITIATOR);
2495         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2496         ahc_lock(ahc, &flags);
2497         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2498                          ppr_options, AHC_TRANS_GOAL, FALSE);
2499         ahc_unlock(ahc, &flags);
2500 }
2501 #endif
2502
2503 static void ahc_linux_get_signalling(struct Scsi_Host *shost)
2504 {
2505         struct ahc_softc *ahc = *(struct ahc_softc **)shost->hostdata;
2506         unsigned long flags;
2507         u8 mode;
2508
2509         if (!(ahc->features & AHC_ULTRA2)) {
2510                 /* non-LVD chipset, may not have SBLKCTL reg */
2511                 spi_signalling(shost) =
2512                         ahc->features & AHC_HVD ?
2513                         SPI_SIGNAL_HVD :
2514                         SPI_SIGNAL_SE;
2515                 return;
2516         }
2517
2518         ahc_lock(ahc, &flags);
2519         ahc_pause(ahc);
2520         mode = ahc_inb(ahc, SBLKCTL);
2521         ahc_unpause(ahc);
2522         ahc_unlock(ahc, &flags);
2523
2524         if (mode & ENAB40)
2525                 spi_signalling(shost) = SPI_SIGNAL_LVD;
2526         else if (mode & ENAB20)
2527                 spi_signalling(shost) = SPI_SIGNAL_SE;
2528         else
2529                 spi_signalling(shost) = SPI_SIGNAL_UNKNOWN;
2530 }
2531
2532 static struct spi_function_template ahc_linux_transport_functions = {
2533         .set_offset     = ahc_linux_set_offset,
2534         .show_offset    = 1,
2535         .set_period     = ahc_linux_set_period,
2536         .show_period    = 1,
2537         .set_width      = ahc_linux_set_width,
2538         .show_width     = 1,
2539         .set_dt         = ahc_linux_set_dt,
2540         .show_dt        = 1,
2541 #if 0
2542         .set_iu         = ahc_linux_set_iu,
2543         .show_iu        = 1,
2544         .set_qas        = ahc_linux_set_qas,
2545         .show_qas       = 1,
2546 #endif
2547         .get_signalling = ahc_linux_get_signalling,
2548 };
2549
2550
2551
2552 static int __init
2553 ahc_linux_init(void)
2554 {
2555         /*
2556          * If we've been passed any parameters, process them now.
2557          */
2558         if (aic7xxx)
2559                 aic7xxx_setup(aic7xxx);
2560
2561         ahc_linux_transport_template =
2562                 spi_attach_transport(&ahc_linux_transport_functions);
2563         if (!ahc_linux_transport_template)
2564                 return -ENODEV;
2565
2566         scsi_transport_reserve_device(ahc_linux_transport_template,
2567                                       sizeof(struct ahc_linux_device));
2568
2569         ahc_linux_pci_init();
2570         ahc_linux_eisa_init();
2571         return 0;
2572 }
2573
2574 static void
2575 ahc_linux_exit(void)
2576 {
2577         ahc_linux_pci_exit();
2578         ahc_linux_eisa_exit();
2579         spi_release_transport(ahc_linux_transport_template);
2580 }
2581
2582 module_init(ahc_linux_init);
2583 module_exit(ahc_linux_exit);