drivers/scsi/aic7xxx/aic7xxx_osm.c

   1 /*
   2  * Adaptec AIC7xxx device driver for Linux.
   3  *
   4  * $Id: //depot/aic7xxx/linux/drivers/scsi/aic7xxx/aic7xxx_osm.c#235 $
   5  *
   6  * Copyright (c) 1994 John Aycock
   7  *   The University of Calgary Department of Computer Science.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2, or (at your option)
  12  * any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; see the file COPYING.  If not, write to
  21  * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  22  *
  23  * Sources include the Adaptec 1740 driver (aha1740.c), the Ultrastor 24F
  24  * driver (ultrastor.c), various Linux kernel source, the Adaptec EISA
  25  * config file (!adp7771.cfg), the Adaptec AHA-2740A Series User's Guide,
  26  * the Linux Kernel Hacker's Guide, Writing a SCSI Device Driver for Linux,
  27  * the Adaptec 1542 driver (aha1542.c), the Adaptec EISA overlay file
  28  * (adp7770.ovl), the Adaptec AHA-2740 Series Technical Reference Manual,
  29  * the Adaptec AIC-7770 Data Book, the ANSI SCSI specification, the
  30  * ANSI SCSI-2 specification (draft 10c), ...
  31  *
  32  * --------------------------------------------------------------------------
  33  *
  34  *  Modifications by Daniel M. Eischen (deischen@iworks.InterWorks.org):
  35  *
  36  *  Substantially modified to include support for wide and twin bus
  37  *  adapters, DMAing of SCBs, tagged queueing, IRQ sharing, bug fixes,
  38  *  SCB paging, and other rework of the code.
  39  *
  40  * --------------------------------------------------------------------------
  41  * Copyright (c) 1994-2000 Justin T. Gibbs.
  42  * Copyright (c) 2000-2001 Adaptec Inc.
  43  * All rights reserved.
  44  *
  45  * Redistribution and use in source and binary forms, with or without
  46  * modification, are permitted provided that the following conditions
  47  * are met:
  48  * 1. Redistributions of source code must retain the above copyright
  49  *    notice, this list of conditions, and the following disclaimer,
  50  *    without modification.
  51  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  52  *    substantially similar to the "NO WARRANTY" disclaimer below
  53  *    ("Disclaimer") and any redistribution must be conditioned upon
  54  *    including a substantially similar Disclaimer requirement for further
  55  *    binary redistribution.
  56  * 3. Neither the names of the above-listed copyright holders nor the names
  57  *    of any contributors may be used to endorse or promote products derived
  58  *    from this software without specific prior written permission.
  59  *
  60  * Alternatively, this software may be distributed under the terms of the
  61  * GNU General Public License ("GPL") version 2 as published by the Free
  62  * Software Foundation.
  63  *
  64  * NO WARRANTY
  65  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  66  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  67  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  68  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  69  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  70  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  71  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  72  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  73  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  74  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  75  * POSSIBILITY OF SUCH DAMAGES.
  76  *
  77  *---------------------------------------------------------------------------
  78  *
  79  *  Thanks also go to (in alphabetical order) the following:
  80  *
  81  *    Rory Bolt     - Sequencer bug fixes
  82  *    Jay Estabrook - Initial DEC Alpha support
  83  *    Doug Ledford  - Much needed abort/reset bug fixes
  84  *    Kai Makisara  - DMAing of SCBs
  85  *
  86  *  A Boot time option was also added for not resetting the scsi bus.
  87  *
  88  *    Form:  aic7xxx=extended
  89  *           aic7xxx=no_reset
  90  *           aic7xxx=verbose
  91  *
  92  *  Daniel M. Eischen, deischen@iworks.InterWorks.org, 1/23/97
  93  *
  94  *  Id: aic7xxx.c,v 4.1 1997/06/12 08:23:42 deang Exp
  95  */
  96
  97 /*
  98  * Further driver modifications made by Doug Ledford <dledford@redhat.com>
  99  *
 100  * Copyright (c) 1997-1999 Doug Ledford
 101  *
 102  * These changes are released under the same licensing terms as the FreeBSD
 103  * driver written by Justin Gibbs.  Please see his Copyright notice above
 104  * for the exact terms and conditions covering my changes as well as the
 105  * warranty statement.
 106  *
 107  * Modifications made to the aic7xxx.c,v 4.1 driver from Dan Eischen include
 108  * but are not limited to:
 109  *
 110  *  1: Import of the latest FreeBSD sequencer code for this driver
 111  *  2: Modification of kernel code to accommodate different sequencer semantics
 112  *  3: Extensive changes throughout kernel portion of driver to improve
 113  *     abort/reset processing and error hanndling
 114  *  4: Other work contributed by various people on the Internet
 115  *  5: Changes to printk information and verbosity selection code
 116  *  6: General reliability related changes, especially in IRQ management
 117  *  7: Modifications to the default probe/attach order for supported cards
 118  *  8: SMP friendliness has been improved
 119  *
 120  */
 121
 122 #include "aic7xxx_osm.h"
 123 #include "aic7xxx_inline.h"
 124 #include <scsi/scsicam.h>
 125
 126 static struct scsi_transport_template *ahc_linux_transport_template = NULL;
 127
 128 #include <linux/init.h>         /* __setup */
 129 #include <linux/mm.h>           /* For fetching system memory size */
 130 #include <linux/blkdev.h>               /* For block_size() */
 131 #include <linux/delay.h>        /* For ssleep/msleep */
 132
 133
 134 /*
 135  * Set this to the delay in seconds after SCSI bus reset.
 136  * Note, we honor this only for the initial bus reset.
 137  * The scsi error recovery code performs its own bus settle
 138  * delay handling for error recovery actions.
 139  */
 140 #ifdef CONFIG_AIC7XXX_RESET_DELAY_MS
 141 #define AIC7XXX_RESET_DELAY CONFIG_AIC7XXX_RESET_DELAY_MS
 142 #else
 143 #define AIC7XXX_RESET_DELAY 5000
 144 #endif
 145
 146 /*
 147  * Control collection of SCSI transfer statistics for the /proc filesystem.
 148  *
 149  * NOTE: Do NOT enable this when running on kernels version 1.2.x and below.
 150  * NOTE: This does affect performance since it has to maintain statistics.
 151  */
 152 #ifdef CONFIG_AIC7XXX_PROC_STATS
 153 #define AIC7XXX_PROC_STATS
 154 #endif
 155
 156 /*
 157  * To change the default number of tagged transactions allowed per-device,
 158  * add a line to the lilo.conf file like:
 159  * append="aic7xxx=verbose,tag_info:{{32,32,32,32},{32,32,32,32}}"
 160  * which will result in the first four devices on the first two
 161  * controllers being set to a tagged queue depth of 32.
 162  *
 163  * The tag_commands is an array of 16 to allow for wide and twin adapters.
 164  * Twin adapters will use indexes 0-7 for channel 0, and indexes 8-15
 165  * for channel 1.
 166  */
 167 typedef struct {
 168         uint8_t tag_commands[16];       /* Allow for wide/twin adapters. */
 169 } adapter_tag_info_t;
 170
 171 /*
 172  * Modify this as you see fit for your system.
 173  *
 174  * 0                    tagged queuing disabled
 175  * 1 <= n <= 253        n == max tags ever dispatched.
 176  *
 177  * The driver will throttle the number of commands dispatched to a
 178  * device if it returns queue full.  For devices with a fixed maximum
 179  * queue depth, the driver will eventually determine this depth and
 180  * lock it in (a console message is printed to indicate that a lock
 181  * has occurred).  On some devices, queue full is returned for a temporary
 182  * resource shortage.  These devices will return queue full at varying
 183  * depths.  The driver will throttle back when the queue fulls occur and
 184  * attempt to slowly increase the depth over time as the device recovers
 185  * from the resource shortage.
 186  *
 187  * In this example, the first line will disable tagged queueing for all
 188  * the devices on the first probed aic7xxx adapter.
 189  *
 190  * The second line enables tagged queueing with 4 commands/LUN for IDs
 191  * (0, 2-11, 13-15), disables tagged queueing for ID 12, and tells the
 192  * driver to attempt to use up to 64 tags for ID 1.
 193  *
 194  * The third line is the same as the first line.
 195  *
 196  * The fourth line disables tagged queueing for devices 0 and 3.  It
 197  * enables tagged queueing for the other IDs, with 16 commands/LUN
 198  * for IDs 1 and 4, 127 commands/LUN for ID 8, and 4 commands/LUN for
 199  * IDs 2, 5-7, and 9-15.
 200  */
 201
 202 /*
 203  * NOTE: The below structure is for reference only, the actual structure
 204  *       to modify in order to change things is just below this comment block.
 205 adapter_tag_info_t aic7xxx_tag_info[] =
 206 {
 207         {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
 208         {{4, 64, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 0, 4, 4, 4}},
 209         {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}},
 210         {{0, 16, 4, 0, 16, 4, 4, 4, 127, 4, 4, 4, 4, 4, 4, 4}}
 211 };
 212 */
 213
 214 #ifdef CONFIG_AIC7XXX_CMDS_PER_DEVICE
 215 #define AIC7XXX_CMDS_PER_DEVICE CONFIG_AIC7XXX_CMDS_PER_DEVICE
 216 #else
 217 #define AIC7XXX_CMDS_PER_DEVICE AHC_MAX_QUEUE
 218 #endif
 219
 220 #define AIC7XXX_CONFIGED_TAG_COMMANDS {                                 \
 221         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 222         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 223         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 224         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 225         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 226         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 227         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE,               \
 228         AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE                \
 229 }
 230
 231 /*
 232  * By default, use the number of commands specified by
 233  * the users kernel configuration.
 234  */
 235 static adapter_tag_info_t aic7xxx_tag_info[] =
 236 {
 237         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 238         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 239         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 240         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 241         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 242         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 243         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 244         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 245         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 246         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 247         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 248         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 249         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 250         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 251         {AIC7XXX_CONFIGED_TAG_COMMANDS},
 252         {AIC7XXX_CONFIGED_TAG_COMMANDS}
 253 };
 254
 255 /*
 256  * There should be a specific return value for this in scsi.h, but
 257  * it seems that most drivers ignore it.
 258  */
 259 #define DID_UNDERFLOW   DID_ERROR
 260
 261 void
 262 ahc_print_path(struct ahc_softc *ahc, struct scb *scb)
 263 {
 264         printk("(scsi%d:%c:%d:%d): ",
 265                ahc->platform_data->host->host_no,
 266                scb != NULL ? SCB_GET_CHANNEL(ahc, scb) : 'X',
 267                scb != NULL ? SCB_GET_TARGET(ahc, scb) : -1,
 268                scb != NULL ? SCB_GET_LUN(scb) : -1);
 269 }
 270
 271 /*
 272  * XXX - these options apply unilaterally to _all_ 274x/284x/294x
 273  *       cards in the system.  This should be fixed.  Exceptions to this
 274  *       rule are noted in the comments.
 275  */
 276
 277 /*
 278  * Skip the scsi bus reset.  Non 0 make us skip the reset at startup.  This
 279  * has no effect on any later resets that might occur due to things like
 280  * SCSI bus timeouts.
 281  */
 282 static uint32_t aic7xxx_no_reset;
 283
 284 /*
 285  * Should we force EXTENDED translation on a controller.
 286  *     0 == Use whatever is in the SEEPROM or default to off
 287  *     1 == Use whatever is in the SEEPROM or default to on
 288  */
 289 static uint32_t aic7xxx_extended;
 290
 291 /*
 292  * PCI bus parity checking of the Adaptec controllers.  This is somewhat
 293  * dubious at best.  To my knowledge, this option has never actually
 294  * solved a PCI parity problem, but on certain machines with broken PCI
 295  * chipset configurations where stray PCI transactions with bad parity are
 296  * the norm rather than the exception, the error messages can be overwelming.
 297  * It's included in the driver for completeness.
 298  *   0     = Shut off PCI parity check
 299  *   non-0 = reverse polarity pci parity checking
 300  */
 301 static uint32_t aic7xxx_pci_parity = ~0;
 302
 303 /*
 304  * There are lots of broken chipsets in the world.  Some of them will
 305  * violate the PCI spec when we issue byte sized memory writes to our
 306  * controller.  I/O mapped register access, if allowed by the given
 307  * platform, will work in almost all cases.
 308  */
 309 uint32_t aic7xxx_allow_memio = ~0;
 310
 311 /*
 312  * So that we can set how long each device is given as a selection timeout.
 313  * The table of values goes like this:
 314  *   0 - 256ms
 315  *   1 - 128ms
 316  *   2 - 64ms
 317  *   3 - 32ms
 318  * We default to 256ms because some older devices need a longer time
 319  * to respond to initial selection.
 320  */
 321 static uint32_t aic7xxx_seltime;
 322
 323 /*
 324  * Certain devices do not perform any aging on commands.  Should the
 325  * device be saturated by commands in one portion of the disk, it is
 326  * possible for transactions on far away sectors to never be serviced.
 327  * To handle these devices, we can periodically send an ordered tag to
 328  * force all outstanding transactions to be serviced prior to a new
 329  * transaction.
 330  */
 331 static uint32_t aic7xxx_periodic_otag;
 332
 333 /*
 334  * Module information and settable options.
 335  */
 336 static char *aic7xxx = NULL;
 337
 338 MODULE_AUTHOR("Maintainer: Justin T. Gibbs <gibbs@scsiguy.com>");
 339 MODULE_DESCRIPTION("Adaptec Aic77XX/78XX SCSI Host Bus Adapter driver");
 340 MODULE_LICENSE("Dual BSD/GPL");
 341 MODULE_VERSION(AIC7XXX_DRIVER_VERSION);
 342 module_param(aic7xxx, charp, 0444);
 343 MODULE_PARM_DESC(aic7xxx,
 344 "period-delimited options string:\n"
 345 "       verbose                 Enable verbose/diagnostic logging\n"
 346 "       allow_memio             Allow device registers to be memory mapped\n"
 347 "       debug                   Bitmask of debug values to enable\n"
 348 "       no_probe                Toggle EISA/VLB controller probing\n"
 349 "       probe_eisa_vl           Toggle EISA/VLB controller probing\n"
 350 "       no_reset                Supress initial bus resets\n"
 351 "       extended                Enable extended geometry on all controllers\n"
 352 "       periodic_otag           Send an ordered tagged transaction\n"
 353 "                               periodically to prevent tag starvation.\n"
 354 "                               This may be required by some older disk\n"
 355 "                               drives or RAID arrays.\n"
 356 "       tag_info:<tag_str>      Set per-target tag depth\n"
 357 "       global_tag_depth:<int>  Global tag depth for every target\n"
 358 "                               on every bus\n"
 359 "       seltime:<int>           Selection Timeout\n"
 360 "                               (0/256ms,1/128ms,2/64ms,3/32ms)\n"
 361 "\n"
 362 "       Sample /etc/modprobe.conf line:\n"
 363 "               Toggle EISA/VLB probing\n"
 364 "               Set tag depth on Controller 1/Target 1 to 10 tags\n"
 365 "               Shorten the selection timeout to 128ms\n"
 366 "\n"
 367 "       options aic7xxx 'aic7xxx=probe_eisa_vl.tag_info:{{}.{.10}}.seltime:1'\n"
 368 );
 369
 370 static void ahc_linux_handle_scsi_status(struct ahc_softc *,
 371                                          struct scsi_device *,
 372                                          struct scb *);
 373 static void ahc_linux_queue_cmd_complete(struct ahc_softc *ahc,
 374                                          struct scsi_cmnd *cmd);
 375 static void ahc_linux_freeze_simq(struct ahc_softc *ahc);
 376 static void ahc_linux_release_simq(struct ahc_softc *ahc);
 377 static int  ahc_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag);
 378 static void ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc);
 379 static u_int ahc_linux_user_tagdepth(struct ahc_softc *ahc,
 380                                      struct ahc_devinfo *devinfo);
 381 static void ahc_linux_device_queue_depth(struct scsi_device *);
 382 static int ahc_linux_run_command(struct ahc_softc*,
 383                                  struct ahc_linux_device *,
 384                                  struct scsi_cmnd *);
 385 static void ahc_linux_setup_tag_info_global(char *p);
 386 static int  aic7xxx_setup(char *s);
 387
 388 static int ahc_linux_unit;
 389
 390
 391 /********************************* Inlines ************************************/
 392 static __inline void ahc_linux_unmap_scb(struct ahc_softc*, struct scb*);
 393
 394 static __inline int ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb,
 395                                       struct ahc_dma_seg *sg,
 396                                       dma_addr_t addr, bus_size_t len);
 397
 398 static __inline void
 399 ahc_linux_unmap_scb(struct ahc_softc *ahc, struct scb *scb)
 400 {
 401         struct scsi_cmnd *cmd;
 402
 403         cmd = scb->io_ctx;
 404         ahc_sync_sglist(ahc, scb, BUS_DMASYNC_POSTWRITE);
 405         if (cmd->use_sg != 0) {
 406                 struct scatterlist *sg;
 407
 408                 sg = (struct scatterlist *)cmd->request_buffer;
 409                 pci_unmap_sg(ahc->dev_softc, sg, cmd->use_sg,
 410                              cmd->sc_data_direction);
 411         } else if (cmd->request_bufflen != 0) {
 412                 pci_unmap_single(ahc->dev_softc,
 413                                  scb->platform_data->buf_busaddr,
 414                                  cmd->request_bufflen,
 415                                  cmd->sc_data_direction);
 416         }
 417 }
 418
 419 static __inline int
 420 ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb,
 421                   struct ahc_dma_seg *sg, dma_addr_t addr, bus_size_t len)
 422 {
 423         int      consumed;
 424
 425         if ((scb->sg_count + 1) > AHC_NSEG)
 426                 panic("Too few segs for dma mapping.  "
 427                       "Increase AHC_NSEG\n");
 428
 429         consumed = 1;
 430         sg->addr = ahc_htole32(addr & 0xFFFFFFFF);
 431         scb->platform_data->xfer_len += len;
 432
 433         if (sizeof(dma_addr_t) > 4
 434          && (ahc->flags & AHC_39BIT_ADDRESSING) != 0)
 435                 len |= (addr >> 8) & AHC_SG_HIGH_ADDR_MASK;
 436
 437         sg->len = ahc_htole32(len);
 438         return (consumed);
 439 }
 440
 441 /*
 442  * Return a string describing the driver.
 443  */
 444 static const char *
 445 ahc_linux_info(struct Scsi_Host *host)
 446 {
 447         static char buffer[512];
 448         char    ahc_info[256];
 449         char   *bp;
 450         struct ahc_softc *ahc;
 451
 452         bp = &buffer[0];
 453         ahc = *(struct ahc_softc **)host->hostdata;
 454         memset(bp, 0, sizeof(buffer));
 455         strcpy(bp, "Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev ");
 456         strcat(bp, AIC7XXX_DRIVER_VERSION);
 457         strcat(bp, "\n");
 458         strcat(bp, "        <");
 459         strcat(bp, ahc->description);
 460         strcat(bp, ">\n");
 461         strcat(bp, "        ");
 462         ahc_controller_info(ahc, ahc_info);
 463         strcat(bp, ahc_info);
 464         strcat(bp, "\n");
 465
 466         return (bp);
 467 }
 468
 469 /*
 470  * Queue an SCB to the controller.
 471  */
 472 static int
 473 ahc_linux_queue(struct scsi_cmnd * cmd, void (*scsi_done) (struct scsi_cmnd *))
 474 {
 475         struct   ahc_softc *ahc;
 476         struct   ahc_linux_device *dev = scsi_transport_device_data(cmd->device);
 477         int rtn = SCSI_MLQUEUE_HOST_BUSY;
 478         unsigned long flags;
 479
 480         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
 481
 482         ahc_lock(ahc, &flags);
 483         if (ahc->platform_data->qfrozen == 0) {
 484                 cmd->scsi_done = scsi_done;
 485                 cmd->result = CAM_REQ_INPROG << 16;
 486                 rtn = ahc_linux_run_command(ahc, dev, cmd);
 487         }
 488         ahc_unlock(ahc, &flags);
 489
 490         return rtn;
 491 }
 492
 493 static inline struct scsi_target **
 494 ahc_linux_target_in_softc(struct scsi_target *starget)
 495 {
 496         struct  ahc_softc *ahc =
 497                 *((struct ahc_softc **)dev_to_shost(&starget->dev)->hostdata);
 498         unsigned int target_offset;
 499
 500         target_offset = starget->id;
 501         if (starget->channel != 0)
 502                 target_offset += 8;
 503
 504         return &ahc->platform_data->starget[target_offset];
 505 }
 506
 507 static int
 508 ahc_linux_target_alloc(struct scsi_target *starget)
 509 {
 510         struct  ahc_softc *ahc =
 511                 *((struct ahc_softc **)dev_to_shost(&starget->dev)->hostdata);
 512         struct seeprom_config *sc = ahc->seep_config;
 513         unsigned long flags;
 514         struct scsi_target **ahc_targp = ahc_linux_target_in_softc(starget);
 515         unsigned short scsirate;
 516         struct ahc_devinfo devinfo;
 517         struct ahc_initiator_tinfo *tinfo;
 518         struct ahc_tmode_tstate *tstate;
 519         char channel = starget->channel + 'A';
 520         unsigned int our_id = ahc->our_id;
 521         unsigned int target_offset;
 522
 523         target_offset = starget->id;
 524         if (starget->channel != 0)
 525                 target_offset += 8;
 526
 527         if (starget->channel)
 528                 our_id = ahc->our_id_b;
 529
 530         ahc_lock(ahc, &flags);
 531
 532         BUG_ON(*ahc_targp != NULL);
 533
 534         *ahc_targp = starget;
 535
 536         if (sc) {
 537                 int maxsync = AHC_SYNCRATE_DT;
 538                 int ultra = 0;
 539                 int flags = sc->device_flags[target_offset];
 540
 541                 if (ahc->flags & AHC_NEWEEPROM_FMT) {
 542                     if (flags & CFSYNCHISULTRA)
 543                         ultra = 1;
 544                 } else if (flags & CFULTRAEN)
 545                         ultra = 1;
 546                 /* AIC nutcase; 10MHz appears as ultra = 1, CFXFER = 0x04
 547                  * change it to ultra=0, CFXFER = 0 */
 548                 if(ultra && (flags & CFXFER) == 0x04) {
 549                         ultra = 0;
 550                         flags &= ~CFXFER;
 551                 }
 552
 553                 if ((ahc->features & AHC_ULTRA2) != 0) {
 554                         scsirate = (flags & CFXFER) | (ultra ? 0x8 : 0);
 555                 } else {
 556                         scsirate = (flags & CFXFER) << 4;
 557                         maxsync = ultra ? AHC_SYNCRATE_ULTRA :
 558                                 AHC_SYNCRATE_FAST;
 559                 }
 560                 spi_max_width(starget) = (flags & CFWIDEB) ? 1 : 0;
 561                 if (!(flags & CFSYNCH))
 562                         spi_max_offset(starget) = 0;
 563                 spi_min_period(starget) =
 564                         ahc_find_period(ahc, scsirate, maxsync);
 565
 566                 tinfo = ahc_fetch_transinfo(ahc, channel, ahc->our_id,
 567                                             starget->id, &tstate);
 568         }
 569         ahc_compile_devinfo(&devinfo, our_id, starget->id,
 570                             CAM_LUN_WILDCARD, channel,
 571                             ROLE_INITIATOR);
 572         ahc_set_syncrate(ahc, &devinfo, NULL, 0, 0, 0,
 573                          AHC_TRANS_GOAL, /*paused*/FALSE);
 574         ahc_set_width(ahc, &devinfo, MSG_EXT_WDTR_BUS_8_BIT,
 575                       AHC_TRANS_GOAL, /*paused*/FALSE);
 576         ahc_unlock(ahc, &flags);
 577
 578         return 0;
 579 }
 580
 581 static void
 582 ahc_linux_target_destroy(struct scsi_target *starget)
 583 {
 584         struct scsi_target **ahc_targp = ahc_linux_target_in_softc(starget);
 585
 586         *ahc_targp = NULL;
 587 }
 588
 589 static int
 590 ahc_linux_slave_alloc(struct scsi_device *sdev)
 591 {
 592         struct  ahc_softc *ahc =
 593                 *((struct ahc_softc **)sdev->host->hostdata);
 594         struct scsi_target *starget = sdev->sdev_target;
 595         struct ahc_linux_device *dev;
 596
 597         if (bootverbose)
 598                 printf("%s: Slave Alloc %d\n", ahc_name(ahc), sdev->id);
 599
 600         dev = scsi_transport_device_data(sdev);
 601         memset(dev, 0, sizeof(*dev));
 602
 603         /*
 604          * We start out life using untagged
 605          * transactions of which we allow one.
 606          */
 607         dev->openings = 1;
 608
 609         /*
 610          * Set maxtags to 0.  This will be changed if we
 611          * later determine that we are dealing with
 612          * a tagged queuing capable device.
 613          */
 614         dev->maxtags = 0;
 615
 616         spi_period(starget) = 0;
 617
 618         return 0;
 619 }
 620
 621 static int
 622 ahc_linux_slave_configure(struct scsi_device *sdev)
 623 {
 624         struct  ahc_softc *ahc;
 625
 626         ahc = *((struct ahc_softc **)sdev->host->hostdata);
 627
 628         if (bootverbose)
 629                 sdev_printk(KERN_INFO, sdev, "Slave Configure\n");
 630
 631         ahc_linux_device_queue_depth(sdev);
 632
 633         /* Initial Domain Validation */
 634         if (!spi_initial_dv(sdev->sdev_target))
 635                 spi_dv_device(sdev);
 636
 637         return 0;
 638 }
 639
 640 #if defined(__i386__)
 641 /*
 642  * Return the disk geometry for the given SCSI device.
 643  */
 644 static int
 645 ahc_linux_biosparam(struct scsi_device *sdev, struct block_device *bdev,
 646                     sector_t capacity, int geom[])
 647 {
 648         uint8_t *bh;
 649         int      heads;
 650         int      sectors;
 651         int      cylinders;
 652         int      ret;
 653         int      extended;
 654         struct   ahc_softc *ahc;
 655         u_int    channel;
 656
 657         ahc = *((struct ahc_softc **)sdev->host->hostdata);
 658         channel = sdev_channel(sdev);
 659
 660         bh = scsi_bios_ptable(bdev);
 661         if (bh) {
 662                 ret = scsi_partsize(bh, capacity,
 663                                     &geom[2], &geom[0], &geom[1]);
 664                 kfree(bh);
 665                 if (ret != -1)
 666                         return (ret);
 667         }
 668         heads = 64;
 669         sectors = 32;
 670         cylinders = aic_sector_div(capacity, heads, sectors);
 671
 672         if (aic7xxx_extended != 0)
 673                 extended = 1;
 674         else if (channel == 0)
 675                 extended = (ahc->flags & AHC_EXTENDED_TRANS_A) != 0;
 676         else
 677                 extended = (ahc->flags & AHC_EXTENDED_TRANS_B) != 0;
 678         if (extended && cylinders >= 1024) {
 679                 heads = 255;
 680                 sectors = 63;
 681                 cylinders = aic_sector_div(capacity, heads, sectors);
 682         }
 683         geom[0] = heads;
 684         geom[1] = sectors;
 685         geom[2] = cylinders;
 686         return (0);
 687 }
 688 #endif
 689
 690 /*
 691  * Abort the current SCSI command(s).
 692  */
 693 static int
 694 ahc_linux_abort(struct scsi_cmnd *cmd)
 695 {
 696         int error;
 697
 698         error = ahc_linux_queue_recovery_cmd(cmd, SCB_ABORT);
 699         if (error != 0)
 700                 printf("aic7xxx_abort returns 0x%x\n", error);
 701         return (error);
 702 }
 703
 704 /*
 705  * Attempt to send a target reset message to the device that timed out.
 706  */
 707 static int
 708 ahc_linux_dev_reset(struct scsi_cmnd *cmd)
 709 {
 710         int error;
 711
 712         error = ahc_linux_queue_recovery_cmd(cmd, SCB_DEVICE_RESET);
 713         if (error != 0)
 714                 printf("aic7xxx_dev_reset returns 0x%x\n", error);
 715         return (error);
 716 }
 717
 718 /*
 719  * Reset the SCSI bus.
 720  */
 721 static int
 722 ahc_linux_bus_reset(struct scsi_cmnd *cmd)
 723 {
 724         struct ahc_softc *ahc;
 725         int    found;
 726         unsigned long flags;
 727
 728         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
 729
 730         ahc_lock(ahc, &flags);
 731         found = ahc_reset_channel(ahc, scmd_channel(cmd) + 'A',
 732                                   /*initiate reset*/TRUE);
 733         ahc_unlock(ahc, &flags);
 734
 735         if (bootverbose)
 736                 printf("%s: SCSI bus reset delivered. "
 737                        "%d SCBs aborted.\n", ahc_name(ahc), found);
 738
 739         return SUCCESS;
 740 }
 741
 742 struct scsi_host_template aic7xxx_driver_template = {
 743         .module                 = THIS_MODULE,
 744         .name                   = "aic7xxx",
 745         .proc_name              = "aic7xxx",
 746         .proc_info              = ahc_linux_proc_info,
 747         .info                   = ahc_linux_info,
 748         .queuecommand           = ahc_linux_queue,
 749         .eh_abort_handler       = ahc_linux_abort,
 750         .eh_device_reset_handler = ahc_linux_dev_reset,
 751         .eh_bus_reset_handler   = ahc_linux_bus_reset,
 752 #if defined(__i386__)
 753         .bios_param             = ahc_linux_biosparam,
 754 #endif
 755         .can_queue              = AHC_MAX_QUEUE,
 756         .this_id                = -1,
 757         .max_sectors            = 8192,
 758         .cmd_per_lun            = 2,
 759         .use_clustering         = ENABLE_CLUSTERING,
 760         .slave_alloc            = ahc_linux_slave_alloc,
 761         .slave_configure        = ahc_linux_slave_configure,
 762         .target_alloc           = ahc_linux_target_alloc,
 763         .target_destroy         = ahc_linux_target_destroy,
 764 };
 765
 766 /**************************** Tasklet Handler *********************************/
 767
 768 /******************************** Macros **************************************/
 769 #define BUILD_SCSIID(ahc, cmd)                                              \
 770         ((((cmd)->device->id << TID_SHIFT) & TID)                           \
 771         | (((cmd)->device->channel == 0) ? (ahc)->our_id : (ahc)->our_id_b) \
 772         | (((cmd)->device->channel == 0) ? 0 : TWIN_CHNLB))
 773
 774 /******************************** Bus DMA *************************************/
 775 int
 776 ahc_dma_tag_create(struct ahc_softc *ahc, bus_dma_tag_t parent,
 777                    bus_size_t alignment, bus_size_t boundary,
 778                    dma_addr_t lowaddr, dma_addr_t highaddr,
 779                    bus_dma_filter_t *filter, void *filterarg,
 780                    bus_size_t maxsize, int nsegments,
 781                    bus_size_t maxsegsz, int flags, bus_dma_tag_t *ret_tag)
 782 {
 783         bus_dma_tag_t dmat;
 784
 785         dmat = malloc(sizeof(*dmat), M_DEVBUF, M_NOWAIT);
 786         if (dmat == NULL)
 787                 return (ENOMEM);
 788
 789         /*
 790          * Linux is very simplistic about DMA memory.  For now don't
 791          * maintain all specification information.  Once Linux supplies
 792          * better facilities for doing these operations, or the
 793          * needs of this particular driver change, we might need to do
 794          * more here.
 795          */
 796         dmat->alignment = alignment;
 797         dmat->boundary = boundary;
 798         dmat->maxsize = maxsize;
 799         *ret_tag = dmat;
 800         return (0);
 801 }
 802
 803 void
 804 ahc_dma_tag_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat)
 805 {
 806         free(dmat, M_DEVBUF);
 807 }
 808
 809 int
 810 ahc_dmamem_alloc(struct ahc_softc *ahc, bus_dma_tag_t dmat, void** vaddr,
 811                  int flags, bus_dmamap_t *mapp)
 812 {
 813         *vaddr = pci_alloc_consistent(ahc->dev_softc,
 814                                       dmat->maxsize, mapp);
 815         if (*vaddr == NULL)
 816                 return ENOMEM;
 817         return 0;
 818 }
 819
 820 void
 821 ahc_dmamem_free(struct ahc_softc *ahc, bus_dma_tag_t dmat,
 822                 void* vaddr, bus_dmamap_t map)
 823 {
 824         pci_free_consistent(ahc->dev_softc, dmat->maxsize,
 825                             vaddr, map);
 826 }
 827
 828 int
 829 ahc_dmamap_load(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map,
 830                 void *buf, bus_size_t buflen, bus_dmamap_callback_t *cb,
 831                 void *cb_arg, int flags)
 832 {
 833         /*
 834          * Assume for now that this will only be used during
 835          * initialization and not for per-transaction buffer mapping.
 836          */
 837         bus_dma_segment_t stack_sg;
 838
 839         stack_sg.ds_addr = map;
 840         stack_sg.ds_len = dmat->maxsize;
 841         cb(cb_arg, &stack_sg, /*nseg*/1, /*error*/0);
 842         return (0);
 843 }
 844
 845 void
 846 ahc_dmamap_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
 847 {
 848 }
 849
 850 int
 851 ahc_dmamap_unload(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map)
 852 {
 853         /* Nothing to do */
 854         return (0);
 855 }
 856
 857 static void
 858 ahc_linux_setup_tag_info_global(char *p)
 859 {
 860         int tags, i, j;
 861
 862         tags = simple_strtoul(p + 1, NULL, 0) & 0xff;
 863         printf("Setting Global Tags= %d\n", tags);
 864
 865         for (i = 0; i < ARRAY_SIZE(aic7xxx_tag_info); i++) {
 866                 for (j = 0; j < AHC_NUM_TARGETS; j++) {
 867                         aic7xxx_tag_info[i].tag_commands[j] = tags;
 868                 }
 869         }
 870 }
 871
 872 static void
 873 ahc_linux_setup_tag_info(u_long arg, int instance, int targ, int32_t value)
 874 {
 875
 876         if ((instance >= 0) && (targ >= 0)
 877          && (instance < ARRAY_SIZE(aic7xxx_tag_info))
 878          && (targ < AHC_NUM_TARGETS)) {
 879                 aic7xxx_tag_info[instance].tag_commands[targ] = value & 0xff;
 880                 if (bootverbose)
 881                         printf("tag_info[%d:%d] = %d\n", instance, targ, value);
 882         }
 883 }
 884
 885 static char *
 886 ahc_parse_brace_option(char *opt_name, char *opt_arg, char *end, int depth,
 887                        void (*callback)(u_long, int, int, int32_t),
 888                        u_long callback_arg)
 889 {
 890         char    *tok_end;
 891         char    *tok_end2;
 892         int      i;
 893         int      instance;
 894         int      targ;
 895         int      done;
 896         char     tok_list[] = {'.', ',', '{', '}', '\0'};
 897
 898         /* All options use a ':' name/arg separator */
 899         if (*opt_arg != ':')
 900                 return (opt_arg);
 901         opt_arg++;
 902         instance = -1;
 903         targ = -1;
 904         done = FALSE;
 905         /*
 906          * Restore separator that may be in
 907          * the middle of our option argument.
 908          */
 909         tok_end = strchr(opt_arg, '\0');
 910         if (tok_end < end)
 911                 *tok_end = ',';
 912         while (!done) {
 913                 switch (*opt_arg) {
 914                 case '{':
 915                         if (instance == -1) {
 916                                 instance = 0;
 917                         } else {
 918                                 if (depth > 1) {
 919                                         if (targ == -1)
 920                                                 targ = 0;
 921                                 } else {
 922                                         printf("Malformed Option %s\n",
 923                                                opt_name);
 924                                         done = TRUE;
 925                                 }
 926                         }
 927                         opt_arg++;
 928                         break;
 929                 case '}':
 930                         if (targ != -1)
 931                                 targ = -1;
 932                         else if (instance != -1)
 933                                 instance = -1;
 934                         opt_arg++;
 935                         break;
 936                 case ',':
 937                 case '.':
 938                         if (instance == -1)
 939                                 done = TRUE;
 940                         else if (targ >= 0)
 941                                 targ++;
 942                         else if (instance >= 0)
 943                                 instance++;
 944                         opt_arg++;
 945                         break;
 946                 case '\0':
 947                         done = TRUE;
 948                         break;
 949                 default:
 950                         tok_end = end;
 951                         for (i = 0; tok_list[i]; i++) {
 952                                 tok_end2 = strchr(opt_arg, tok_list[i]);
 953                                 if ((tok_end2) && (tok_end2 < tok_end))
 954                                         tok_end = tok_end2;
 955                         }
 956                         callback(callback_arg, instance, targ,
 957                                  simple_strtol(opt_arg, NULL, 0));
 958                         opt_arg = tok_end;
 959                         break;
 960                 }
 961         }
 962         return (opt_arg);
 963 }
 964
 965 /*
 966  * Handle Linux boot parameters. This routine allows for assigning a value
 967  * to a parameter with a ':' between the parameter and the value.
 968  * ie. aic7xxx=stpwlev:1,extended
 969  */
 970 static int
 971 aic7xxx_setup(char *s)
 972 {
 973         int     i, n;
 974         char   *p;
 975         char   *end;
 976
 977         static struct {
 978                 const char *name;
 979                 uint32_t *flag;
 980         } options[] = {
 981                 { "extended", &aic7xxx_extended },
 982                 { "no_reset", &aic7xxx_no_reset },
 983                 { "verbose", &aic7xxx_verbose },
 984                 { "allow_memio", &aic7xxx_allow_memio},
 985 #ifdef AHC_DEBUG
 986                 { "debug", &ahc_debug },
 987 #endif
 988                 { "periodic_otag", &aic7xxx_periodic_otag },
 989                 { "pci_parity", &aic7xxx_pci_parity },
 990                 { "seltime", &aic7xxx_seltime },
 991                 { "tag_info", NULL },
 992                 { "global_tag_depth", NULL },
 993                 { "dv", NULL }
 994         };
 995
 996         end = strchr(s, '\0');
 997
 998         /*
 999          * XXX ia64 gcc isn't smart enough to know that ARRAY_SIZE
1000          * will never be 0 in this case.
1001          */
1002         n = 0;
1003
1004         while ((p = strsep(&s, ",.")) != NULL) {
1005                 if (*p == '\0')
1006                         continue;
1007                 for (i = 0; i < ARRAY_SIZE(options); i++) {
1008
1009                         n = strlen(options[i].name);
1010                         if (strncmp(options[i].name, p, n) == 0)
1011                                 break;
1012                 }
1013                 if (i == ARRAY_SIZE(options))
1014                         continue;
1015
1016                 if (strncmp(p, "global_tag_depth", n) == 0) {
1017                         ahc_linux_setup_tag_info_global(p + n);
1018                 } else if (strncmp(p, "tag_info", n) == 0) {
1019                         s = ahc_parse_brace_option("tag_info", p + n, end,
1020                             2, ahc_linux_setup_tag_info, 0);
1021                 } else if (p[n] == ':') {
1022                         *(options[i].flag) = simple_strtoul(p + n + 1, NULL, 0);
1023                 } else if (strncmp(p, "verbose", n) == 0) {
1024                         *(options[i].flag) = 1;
1025                 } else {
1026                         *(options[i].flag) ^= 0xFFFFFFFF;
1027                 }
1028         }
1029         return 1;
1030 }
1031
1032 __setup("aic7xxx=", aic7xxx_setup);
1033
1034 uint32_t aic7xxx_verbose;
1035
1036 int
1037 ahc_linux_register_host(struct ahc_softc *ahc, struct scsi_host_template *template)
1038 {
1039         char    buf[80];
1040         struct  Scsi_Host *host;
1041         char    *new_name;
1042         u_long  s;
1043         int     retval;
1044
1045         template->name = ahc->description;
1046         host = scsi_host_alloc(template, sizeof(struct ahc_softc *));
1047         if (host == NULL)
1048                 return (ENOMEM);
1049
1050         *((struct ahc_softc **)host->hostdata) = ahc;
1051         ahc->platform_data->host = host;
1052         host->can_queue = AHC_MAX_QUEUE;
1053         host->cmd_per_lun = 2;
1054         /* XXX No way to communicate the ID for multiple channels */
1055         host->this_id = ahc->our_id;
1056         host->irq = ahc->platform_data->irq;
1057         host->max_id = (ahc->features & AHC_WIDE) ? 16 : 8;
1058         host->max_lun = AHC_NUM_LUNS;
1059         host->max_channel = (ahc->features & AHC_TWIN) ? 1 : 0;
1060         host->sg_tablesize = AHC_NSEG;
1061         ahc_lock(ahc, &s);
1062         ahc_set_unit(ahc, ahc_linux_unit++);
1063         ahc_unlock(ahc, &s);
1064         sprintf(buf, "scsi%d", host->host_no);
1065         new_name = malloc(strlen(buf) + 1, M_DEVBUF, M_NOWAIT);
1066         if (new_name != NULL) {
1067                 strcpy(new_name, buf);
1068                 ahc_set_name(ahc, new_name);
1069         }
1070         host->unique_id = ahc->unit;
1071         ahc_linux_initialize_scsi_bus(ahc);
1072         ahc_intr_enable(ahc, TRUE);
1073
1074         host->transportt = ahc_linux_transport_template;
1075
1076         retval = scsi_add_host(host,
1077                         (ahc->dev_softc ? &ahc->dev_softc->dev : NULL));
1078         if (retval) {
1079                 printk(KERN_WARNING "aic7xxx: scsi_add_host failed\n");
1080                 scsi_host_put(host);
1081                 return retval;
1082         }
1083
1084         scsi_scan_host(host);
1085         return 0;
1086 }
1087
1088 /*
1089  * Place the SCSI bus into a known state by either resetting it,
1090  * or forcing transfer negotiations on the next command to any
1091  * target.
1092  */
1093 void
1094 ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc)
1095 {
1096         int i;
1097         int numtarg;
1098         unsigned long s;
1099
1100         i = 0;
1101         numtarg = 0;
1102
1103         ahc_lock(ahc, &s);
1104
1105         if (aic7xxx_no_reset != 0)
1106                 ahc->flags &= ~(AHC_RESET_BUS_A|AHC_RESET_BUS_B);
1107
1108         if ((ahc->flags & AHC_RESET_BUS_A) != 0)
1109                 ahc_reset_channel(ahc, 'A', /*initiate_reset*/TRUE);
1110         else
1111                 numtarg = (ahc->features & AHC_WIDE) ? 16 : 8;
1112
1113         if ((ahc->features & AHC_TWIN) != 0) {
1114
1115                 if ((ahc->flags & AHC_RESET_BUS_B) != 0) {
1116                         ahc_reset_channel(ahc, 'B', /*initiate_reset*/TRUE);
1117                 } else {
1118                         if (numtarg == 0)
1119                                 i = 8;
1120                         numtarg += 8;
1121                 }
1122         }
1123
1124         /*
1125          * Force negotiation to async for all targets that
1126          * will not see an initial bus reset.
1127          */
1128         for (; i < numtarg; i++) {
1129                 struct ahc_devinfo devinfo;
1130                 struct ahc_initiator_tinfo *tinfo;
1131                 struct ahc_tmode_tstate *tstate;
1132                 u_int our_id;
1133                 u_int target_id;
1134                 char channel;
1135
1136                 channel = 'A';
1137                 our_id = ahc->our_id;
1138                 target_id = i;
1139                 if (i > 7 && (ahc->features & AHC_TWIN) != 0) {
1140                         channel = 'B';
1141                         our_id = ahc->our_id_b;
1142                         target_id = i % 8;
1143                 }
1144                 tinfo = ahc_fetch_transinfo(ahc, channel, our_id,
1145                                             target_id, &tstate);
1146                 ahc_compile_devinfo(&devinfo, our_id, target_id,
1147                                     CAM_LUN_WILDCARD, channel, ROLE_INITIATOR);
1148                 ahc_update_neg_request(ahc, &devinfo, tstate,
1149                                        tinfo, AHC_NEG_ALWAYS);
1150         }
1151         ahc_unlock(ahc, &s);
1152         /* Give the bus some time to recover */
1153         if ((ahc->flags & (AHC_RESET_BUS_A|AHC_RESET_BUS_B)) != 0) {
1154                 ahc_linux_freeze_simq(ahc);
1155                 msleep(AIC7XXX_RESET_DELAY);
1156                 ahc_linux_release_simq(ahc);
1157         }
1158 }
1159
1160 int
1161 ahc_platform_alloc(struct ahc_softc *ahc, void *platform_arg)
1162 {
1163
1164         ahc->platform_data =
1165             malloc(sizeof(struct ahc_platform_data), M_DEVBUF, M_NOWAIT);
1166         if (ahc->platform_data == NULL)
1167                 return (ENOMEM);
1168         memset(ahc->platform_data, 0, sizeof(struct ahc_platform_data));
1169         ahc->platform_data->irq = AHC_LINUX_NOIRQ;
1170         ahc_lockinit(ahc);
1171         ahc->seltime = (aic7xxx_seltime & 0x3) << 4;
1172         ahc->seltime_b = (aic7xxx_seltime & 0x3) << 4;
1173         if (aic7xxx_pci_parity == 0)
1174                 ahc->flags |= AHC_DISABLE_PCI_PERR;
1175
1176         return (0);
1177 }
1178
1179 void
1180 ahc_platform_free(struct ahc_softc *ahc)
1181 {
1182         struct scsi_target *starget;
1183         int i;
1184
1185         if (ahc->platform_data != NULL) {
1186                 /* destroy all of the device and target objects */
1187                 for (i = 0; i < AHC_NUM_TARGETS; i++) {
1188                         starget = ahc->platform_data->starget[i];
1189                         if (starget != NULL) {
1190                                 ahc->platform_data->starget[i] = NULL;
1191                         }
1192                 }
1193
1194                 if (ahc->platform_data->irq != AHC_LINUX_NOIRQ)
1195                         free_irq(ahc->platform_data->irq, ahc);
1196                 if (ahc->tag == BUS_SPACE_PIO
1197                  && ahc->bsh.ioport != 0)
1198                         release_region(ahc->bsh.ioport, 256);
1199                 if (ahc->tag == BUS_SPACE_MEMIO
1200                  && ahc->bsh.maddr != NULL) {
1201                         iounmap(ahc->bsh.maddr);
1202                         release_mem_region(ahc->platform_data->mem_busaddr,
1203                                            0x1000);
1204                 }
1205
1206                 if (ahc->platform_data->host)
1207                         scsi_host_put(ahc->platform_data->host);
1208
1209                 free(ahc->platform_data, M_DEVBUF);
1210         }
1211 }
1212
1213 void
1214 ahc_platform_freeze_devq(struct ahc_softc *ahc, struct scb *scb)
1215 {
1216         ahc_platform_abort_scbs(ahc, SCB_GET_TARGET(ahc, scb),
1217                                 SCB_GET_CHANNEL(ahc, scb),
1218                                 SCB_GET_LUN(scb), SCB_LIST_NULL,
1219                                 ROLE_UNKNOWN, CAM_REQUEUE_REQ);
1220 }
1221
1222 void
1223 ahc_platform_set_tags(struct ahc_softc *ahc, struct scsi_device *sdev,
1224                       struct ahc_devinfo *devinfo, ahc_queue_alg alg)
1225 {
1226         struct ahc_linux_device *dev;
1227         int was_queuing;
1228         int now_queuing;
1229
1230         if (sdev == NULL)
1231                 return;
1232         dev = scsi_transport_device_data(sdev);
1233
1234         was_queuing = dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED);
1235         switch (alg) {
1236         default:
1237         case AHC_QUEUE_NONE:
1238                 now_queuing = 0;
1239                 break;
1240         case AHC_QUEUE_BASIC:
1241                 now_queuing = AHC_DEV_Q_BASIC;
1242                 break;
1243         case AHC_QUEUE_TAGGED:
1244                 now_queuing = AHC_DEV_Q_TAGGED;
1245                 break;
1246         }
1247         if ((dev->flags & AHC_DEV_FREEZE_TIL_EMPTY) == 0
1248          && (was_queuing != now_queuing)
1249          && (dev->active != 0)) {
1250                 dev->flags |= AHC_DEV_FREEZE_TIL_EMPTY;
1251                 dev->qfrozen++;
1252         }
1253
1254         dev->flags &= ~(AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED|AHC_DEV_PERIODIC_OTAG);
1255         if (now_queuing) {
1256                 u_int usertags;
1257
1258                 usertags = ahc_linux_user_tagdepth(ahc, devinfo);
1259                 if (!was_queuing) {
1260                         /*
1261                          * Start out agressively and allow our
1262                          * dynamic queue depth algorithm to take
1263                          * care of the rest.
1264                          */
1265                         dev->maxtags = usertags;
1266                         dev->openings = dev->maxtags - dev->active;
1267                 }
1268                 if (dev->maxtags == 0) {
1269                         /*
1270                          * Queueing is disabled by the user.
1271                          */
1272                         dev->openings = 1;
1273                 } else if (alg == AHC_QUEUE_TAGGED) {
1274                         dev->flags |= AHC_DEV_Q_TAGGED;
1275                         if (aic7xxx_periodic_otag != 0)
1276                                 dev->flags |= AHC_DEV_PERIODIC_OTAG;
1277                 } else
1278                         dev->flags |= AHC_DEV_Q_BASIC;
1279         } else {
1280                 /* We can only have one opening. */
1281                 dev->maxtags = 0;
1282                 dev->openings =  1 - dev->active;
1283         }
1284         switch ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED))) {
1285         case AHC_DEV_Q_BASIC:
1286                 scsi_set_tag_type(sdev, MSG_SIMPLE_TAG);
1287                 scsi_activate_tcq(sdev, dev->openings + dev->active);
1288                 break;
1289         case AHC_DEV_Q_TAGGED:
1290                 scsi_set_tag_type(sdev, MSG_ORDERED_TAG);
1291                 scsi_activate_tcq(sdev, dev->openings + dev->active);
1292                 break;
1293         default:
1294                 /*
1295                  * We allow the OS to queue 2 untagged transactions to
1296                  * us at any time even though we can only execute them
1297                  * serially on the controller/device.  This should
1298                  * remove some latency.
1299                  */
1300                 scsi_deactivate_tcq(sdev, 2);
1301                 break;
1302         }
1303 }
1304
1305 int
1306 ahc_platform_abort_scbs(struct ahc_softc *ahc, int target, char channel,
1307                         int lun, u_int tag, role_t role, uint32_t status)
1308 {
1309         return 0;
1310 }
1311
1312 static u_int
1313 ahc_linux_user_tagdepth(struct ahc_softc *ahc, struct ahc_devinfo *devinfo)
1314 {
1315         static int warned_user;
1316         u_int tags;
1317
1318         tags = 0;
1319         if ((ahc->user_discenable & devinfo->target_mask) != 0) {
1320                 if (ahc->unit >= ARRAY_SIZE(aic7xxx_tag_info)) {
1321                         if (warned_user == 0) {
1322
1323                                 printf(KERN_WARNING
1324 "aic7xxx: WARNING: Insufficient tag_info instances\n"
1325 "aic7xxx: for installed controllers. Using defaults\n"
1326 "aic7xxx: Please update the aic7xxx_tag_info array in\n"
1327 "aic7xxx: the aic7xxx_osm..c source file.\n");
1328                                 warned_user++;
1329                         }
1330                         tags = AHC_MAX_QUEUE;
1331                 } else {
1332                         adapter_tag_info_t *tag_info;
1333
1334                         tag_info = &aic7xxx_tag_info[ahc->unit];
1335                         tags = tag_info->tag_commands[devinfo->target_offset];
1336                         if (tags > AHC_MAX_QUEUE)
1337                                 tags = AHC_MAX_QUEUE;
1338                 }
1339         }
1340         return (tags);
1341 }
1342
1343 /*
1344  * Determines the queue depth for a given device.
1345  */
1346 static void
1347 ahc_linux_device_queue_depth(struct scsi_device *sdev)
1348 {
1349         struct  ahc_devinfo devinfo;
1350         u_int   tags;
1351         struct ahc_softc *ahc = *((struct ahc_softc **)sdev->host->hostdata);
1352
1353         ahc_compile_devinfo(&devinfo,
1354                             sdev->sdev_target->channel == 0
1355                           ? ahc->our_id : ahc->our_id_b,
1356                             sdev->sdev_target->id, sdev->lun,
1357                             sdev->sdev_target->channel == 0 ? 'A' : 'B',
1358                             ROLE_INITIATOR);
1359         tags = ahc_linux_user_tagdepth(ahc, &devinfo);
1360         if (tags != 0 && sdev->tagged_supported != 0) {
1361
1362                 ahc_platform_set_tags(ahc, sdev, &devinfo, AHC_QUEUE_TAGGED);
1363                 ahc_send_async(ahc, devinfo.channel, devinfo.target,
1364                                devinfo.lun, AC_TRANSFER_NEG);
1365                 ahc_print_devinfo(ahc, &devinfo);
1366                 printf("Tagged Queuing enabled.  Depth %d\n", tags);
1367         } else {
1368                 ahc_platform_set_tags(ahc, sdev, &devinfo, AHC_QUEUE_NONE);
1369                 ahc_send_async(ahc, devinfo.channel, devinfo.target,
1370                                devinfo.lun, AC_TRANSFER_NEG);
1371         }
1372 }
1373
1374 static int
1375 ahc_linux_run_command(struct ahc_softc *ahc, struct ahc_linux_device *dev,
1376                       struct scsi_cmnd *cmd)
1377 {
1378         struct   scb *scb;
1379         struct   hardware_scb *hscb;
1380         struct   ahc_initiator_tinfo *tinfo;
1381         struct   ahc_tmode_tstate *tstate;
1382         uint16_t mask;
1383         struct scb_tailq *untagged_q = NULL;
1384
1385         /*
1386          * Schedule us to run later.  The only reason we are not
1387          * running is because the whole controller Q is frozen.
1388          */
1389         if (ahc->platform_data->qfrozen != 0)
1390                 return SCSI_MLQUEUE_HOST_BUSY;
1391
1392         /*
1393          * We only allow one untagged transaction
1394          * per target in the initiator role unless
1395          * we are storing a full busy target *lun*
1396          * table in SCB space.
1397          */
1398         if (!blk_rq_tagged(cmd->request)
1399             && (ahc->features & AHC_SCB_BTT) == 0) {
1400                 int target_offset;
1401
1402                 target_offset = cmd->device->id + cmd->device->channel * 8;
1403                 untagged_q = &(ahc->untagged_queues[target_offset]);
1404                 if (!TAILQ_EMPTY(untagged_q))
1405                         /* if we're already executing an untagged command
1406                          * we're busy to another */
1407                         return SCSI_MLQUEUE_DEVICE_BUSY;
1408         }
1409
1410         /*
1411          * Get an scb to use.
1412          */
1413         scb = ahc_get_scb(ahc);
1414         if (!scb)
1415                 return SCSI_MLQUEUE_HOST_BUSY;
1416
1417         scb->io_ctx = cmd;
1418         scb->platform_data->dev = dev;
1419         hscb = scb->hscb;
1420         cmd->host_scribble = (char *)scb;
1421
1422         /*
1423          * Fill out basics of the HSCB.
1424          */
1425         hscb->control = 0;
1426         hscb->scsiid = BUILD_SCSIID(ahc, cmd);
1427         hscb->lun = cmd->device->lun;
1428         mask = SCB_GET_TARGET_MASK(ahc, scb);
1429         tinfo = ahc_fetch_transinfo(ahc, SCB_GET_CHANNEL(ahc, scb),
1430                                     SCB_GET_OUR_ID(scb),
1431                                     SCB_GET_TARGET(ahc, scb), &tstate);
1432         hscb->scsirate = tinfo->scsirate;
1433         hscb->scsioffset = tinfo->curr.offset;
1434         if ((tstate->ultraenb & mask) != 0)
1435                 hscb->control |= ULTRAENB;
1436
1437         if ((ahc->user_discenable & mask) != 0)
1438                 hscb->control |= DISCENB;
1439
1440         if ((tstate->auto_negotiate & mask) != 0) {
1441                 scb->flags |= SCB_AUTO_NEGOTIATE;
1442                 scb->hscb->control |= MK_MESSAGE;
1443         }
1444
1445         if ((dev->flags & (AHC_DEV_Q_TAGGED|AHC_DEV_Q_BASIC)) != 0) {
1446                 int     msg_bytes;
1447                 uint8_t tag_msgs[2];
1448
1449                 msg_bytes = scsi_populate_tag_msg(cmd, tag_msgs);
1450                 if (msg_bytes && tag_msgs[0] != MSG_SIMPLE_TASK) {
1451                         hscb->control |= tag_msgs[0];
1452                         if (tag_msgs[0] == MSG_ORDERED_TASK)
1453                                 dev->commands_since_idle_or_otag = 0;
1454                 } else if (dev->commands_since_idle_or_otag == AHC_OTAG_THRESH
1455                                 && (dev->flags & AHC_DEV_Q_TAGGED) != 0) {
1456                         hscb->control |= MSG_ORDERED_TASK;
1457                         dev->commands_since_idle_or_otag = 0;
1458                 } else {
1459                         hscb->control |= MSG_SIMPLE_TASK;
1460                 }
1461         }
1462
1463         hscb->cdb_len = cmd->cmd_len;
1464         if (hscb->cdb_len <= 12) {
1465                 memcpy(hscb->shared_data.cdb, cmd->cmnd, hscb->cdb_len);
1466         } else {
1467                 memcpy(hscb->cdb32, cmd->cmnd, hscb->cdb_len);
1468                 scb->flags |= SCB_CDB32_PTR;
1469         }
1470
1471         scb->platform_data->xfer_len = 0;
1472         ahc_set_residual(scb, 0);
1473         ahc_set_sense_residual(scb, 0);
1474         scb->sg_count = 0;
1475         if (cmd->use_sg != 0) {
1476                 struct  ahc_dma_seg *sg;
1477                 struct  scatterlist *cur_seg;
1478                 struct  scatterlist *end_seg;
1479                 int     nseg;
1480
1481                 cur_seg = (struct scatterlist *)cmd->request_buffer;
1482                 nseg = pci_map_sg(ahc->dev_softc, cur_seg, cmd->use_sg,
1483                                   cmd->sc_data_direction);
1484                 end_seg = cur_seg + nseg;
1485                 /* Copy the segments into the SG list. */
1486                 sg = scb->sg_list;
1487                 /*
1488                  * The sg_count may be larger than nseg if
1489                  * a transfer crosses a 32bit page.
1490                  */
1491                 while (cur_seg < end_seg) {
1492                         dma_addr_t addr;
1493                         bus_size_t len;
1494                         int consumed;
1495
1496                         addr = sg_dma_address(cur_seg);
1497                         len = sg_dma_len(cur_seg);
1498                         consumed = ahc_linux_map_seg(ahc, scb,
1499                                                      sg, addr, len);
1500                         sg += consumed;
1501                         scb->sg_count += consumed;
1502                         cur_seg++;
1503                 }
1504                 sg--;
1505                 sg->len |= ahc_htole32(AHC_DMA_LAST_SEG);
1506
1507                 /*
1508                  * Reset the sg list pointer.
1509                  */
1510                 scb->hscb->sgptr =
1511                         ahc_htole32(scb->sg_list_phys | SG_FULL_RESID);
1512
1513                 /*
1514                  * Copy the first SG into the "current"
1515                  * data pointer area.
1516                  */
1517                 scb->hscb->dataptr = scb->sg_list->addr;
1518                 scb->hscb->datacnt = scb->sg_list->len;
1519         } else if (cmd->request_bufflen != 0) {
1520                 struct   ahc_dma_seg *sg;
1521                 dma_addr_t addr;
1522
1523                 sg = scb->sg_list;
1524                 addr = pci_map_single(ahc->dev_softc,
1525                                       cmd->request_buffer,
1526                                       cmd->request_bufflen,
1527                                       cmd->sc_data_direction);
1528                 scb->platform_data->buf_busaddr = addr;
1529                 scb->sg_count = ahc_linux_map_seg(ahc, scb,
1530                                                   sg, addr,
1531                                                   cmd->request_bufflen);
1532                 sg->len |= ahc_htole32(AHC_DMA_LAST_SEG);
1533
1534                 /*
1535                  * Reset the sg list pointer.
1536                  */
1537                 scb->hscb->sgptr =
1538                         ahc_htole32(scb->sg_list_phys | SG_FULL_RESID);
1539
1540                 /*
1541                  * Copy the first SG into the "current"
1542                  * data pointer area.
1543                  */
1544                 scb->hscb->dataptr = sg->addr;
1545                 scb->hscb->datacnt = sg->len;
1546         } else {
1547                 scb->hscb->sgptr = ahc_htole32(SG_LIST_NULL);
1548                 scb->hscb->dataptr = 0;
1549                 scb->hscb->datacnt = 0;
1550                 scb->sg_count = 0;
1551         }
1552
1553         LIST_INSERT_HEAD(&ahc->pending_scbs, scb, pending_links);
1554         dev->openings--;
1555         dev->active++;
1556         dev->commands_issued++;
1557         if ((dev->flags & AHC_DEV_PERIODIC_OTAG) != 0)
1558                 dev->commands_since_idle_or_otag++;
1559
1560         scb->flags |= SCB_ACTIVE;
1561         if (untagged_q) {
1562                 TAILQ_INSERT_TAIL(untagged_q, scb, links.tqe);
1563                 scb->flags |= SCB_UNTAGGEDQ;
1564         }
1565         ahc_queue_scb(ahc, scb);
1566         return 0;
1567 }
1568
1569 /*
1570  * SCSI controller interrupt handler.
1571  */
1572 irqreturn_t
1573 ahc_linux_isr(int irq, void *dev_id)
1574 {
1575         struct  ahc_softc *ahc;
1576         u_long  flags;
1577         int     ours;
1578
1579         ahc = (struct ahc_softc *) dev_id;
1580         ahc_lock(ahc, &flags);
1581         ours = ahc_intr(ahc);
1582         ahc_unlock(ahc, &flags);
1583         return IRQ_RETVAL(ours);
1584 }
1585
1586 void
1587 ahc_platform_flushwork(struct ahc_softc *ahc)
1588 {
1589
1590 }
1591
1592 void
1593 ahc_send_async(struct ahc_softc *ahc, char channel,
1594                u_int target, u_int lun, ac_code code)
1595 {
1596         switch (code) {
1597         case AC_TRANSFER_NEG:
1598         {
1599                 char    buf[80];
1600                 struct  scsi_target *starget;
1601                 struct  ahc_linux_target *targ;
1602                 struct  info_str info;
1603                 struct  ahc_initiator_tinfo *tinfo;
1604                 struct  ahc_tmode_tstate *tstate;
1605                 int     target_offset;
1606                 unsigned int target_ppr_options;
1607
1608                 BUG_ON(target == CAM_TARGET_WILDCARD);
1609
1610                 info.buffer = buf;
1611                 info.length = sizeof(buf);
1612                 info.offset = 0;
1613                 info.pos = 0;
1614                 tinfo = ahc_fetch_transinfo(ahc, channel,
1615                                                 channel == 'A' ? ahc->our_id
1616                                                                : ahc->our_id_b,
1617                                                 target, &tstate);
1618
1619                 /*
1620                  * Don't bother reporting results while
1621                  * negotiations are still pending.
1622                  */
1623                 if (tinfo->curr.period != tinfo->goal.period
1624                  || tinfo->curr.width != tinfo->goal.width
1625                  || tinfo->curr.offset != tinfo->goal.offset
1626                  || tinfo->curr.ppr_options != tinfo->goal.ppr_options)
1627                         if (bootverbose == 0)
1628                                 break;
1629
1630                 /*
1631                  * Don't bother reporting results that
1632                  * are identical to those last reported.
1633                  */
1634                 target_offset = target;
1635                 if (channel == 'B')
1636                         target_offset += 8;
1637                 starget = ahc->platform_data->starget[target_offset];
1638                 if (starget == NULL)
1639                         break;
1640                 targ = scsi_transport_target_data(starget);
1641
1642                 target_ppr_options =
1643                         (spi_dt(starget) ? MSG_EXT_PPR_DT_REQ : 0)
1644                         + (spi_qas(starget) ? MSG_EXT_PPR_QAS_REQ : 0)
1645                         + (spi_iu(starget) ?  MSG_EXT_PPR_IU_REQ : 0);
1646
1647                 if (tinfo->curr.period == spi_period(starget)
1648                     && tinfo->curr.width == spi_width(starget)
1649                     && tinfo->curr.offset == spi_offset(starget)
1650                  && tinfo->curr.ppr_options == target_ppr_options)
1651                         if (bootverbose == 0)
1652                                 break;
1653
1654                 spi_period(starget) = tinfo->curr.period;
1655                 spi_width(starget) = tinfo->curr.width;
1656                 spi_offset(starget) = tinfo->curr.offset;
1657                 spi_dt(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_DT_REQ ? 1 : 0;
1658                 spi_qas(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_QAS_REQ ? 1 : 0;
1659                 spi_iu(starget) = tinfo->curr.ppr_options & MSG_EXT_PPR_IU_REQ ? 1 : 0;
1660                 spi_display_xfer_agreement(starget);
1661                 break;
1662         }
1663         case AC_SENT_BDR:
1664         {
1665                 WARN_ON(lun != CAM_LUN_WILDCARD);
1666                 scsi_report_device_reset(ahc->platform_data->host,
1667                                          channel - 'A', target);
1668                 break;
1669         }
1670         case AC_BUS_RESET:
1671                 if (ahc->platform_data->host != NULL) {
1672                         scsi_report_bus_reset(ahc->platform_data->host,
1673                                               channel - 'A');
1674                 }
1675                 break;
1676         default:
1677                 panic("ahc_send_async: Unexpected async event");
1678         }
1679 }
1680
1681 /*
1682  * Calls the higher level scsi done function and frees the scb.
1683  */
1684 void
1685 ahc_done(struct ahc_softc *ahc, struct scb *scb)
1686 {
1687         struct scsi_cmnd *cmd;
1688         struct     ahc_linux_device *dev;
1689
1690         LIST_REMOVE(scb, pending_links);
1691         if ((scb->flags & SCB_UNTAGGEDQ) != 0) {
1692                 struct scb_tailq *untagged_q;
1693                 int target_offset;
1694
1695                 target_offset = SCB_GET_TARGET_OFFSET(ahc, scb);
1696                 untagged_q = &(ahc->untagged_queues[target_offset]);
1697                 TAILQ_REMOVE(untagged_q, scb, links.tqe);
1698                 BUG_ON(!TAILQ_EMPTY(untagged_q));
1699         }
1700
1701         if ((scb->flags & SCB_ACTIVE) == 0) {
1702                 printf("SCB %d done'd twice\n", scb->hscb->tag);
1703                 ahc_dump_card_state(ahc);
1704                 panic("Stopping for safety");
1705         }
1706         cmd = scb->io_ctx;
1707         dev = scb->platform_data->dev;
1708         dev->active--;
1709         dev->openings++;
1710         if ((cmd->result & (CAM_DEV_QFRZN << 16)) != 0) {
1711                 cmd->result &= ~(CAM_DEV_QFRZN << 16);
1712                 dev->qfrozen--;
1713         }
1714         ahc_linux_unmap_scb(ahc, scb);
1715
1716         /*
1717          * Guard against stale sense data.
1718          * The Linux mid-layer assumes that sense
1719          * was retrieved anytime the first byte of
1720          * the sense buffer looks "sane".
1721          */
1722         cmd->sense_buffer[0] = 0;
1723         if (ahc_get_transaction_status(scb) == CAM_REQ_INPROG) {
1724                 uint32_t amount_xferred;
1725
1726                 amount_xferred =
1727                     ahc_get_transfer_length(scb) - ahc_get_residual(scb);
1728                 if ((scb->flags & SCB_TRANSMISSION_ERROR) != 0) {
1729 #ifdef AHC_DEBUG
1730                         if ((ahc_debug & AHC_SHOW_MISC) != 0) {
1731                                 ahc_print_path(ahc, scb);
1732                                 printf("Set CAM_UNCOR_PARITY\n");
1733                         }
1734 #endif
1735                         ahc_set_transaction_status(scb, CAM_UNCOR_PARITY);
1736 #ifdef AHC_REPORT_UNDERFLOWS
1737                 /*
1738                  * This code is disabled by default as some
1739                  * clients of the SCSI system do not properly
1740                  * initialize the underflow parameter.  This
1741                  * results in spurious termination of commands
1742                  * that complete as expected (e.g. underflow is
1743                  * allowed as command can return variable amounts
1744                  * of data.
1745                  */
1746                 } else if (amount_xferred < scb->io_ctx->underflow) {
1747                         u_int i;
1748
1749                         ahc_print_path(ahc, scb);
1750                         printf("CDB:");
1751                         for (i = 0; i < scb->io_ctx->cmd_len; i++)
1752                                 printf(" 0x%x", scb->io_ctx->cmnd[i]);
1753                         printf("\n");
1754                         ahc_print_path(ahc, scb);
1755                         printf("Saw underflow (%ld of %ld bytes). "
1756                                "Treated as error\n",
1757                                 ahc_get_residual(scb),
1758                                 ahc_get_transfer_length(scb));
1759                         ahc_set_transaction_status(scb, CAM_DATA_RUN_ERR);
1760 #endif
1761                 } else {
1762                         ahc_set_transaction_status(scb, CAM_REQ_CMP);
1763                 }
1764         } else if (ahc_get_transaction_status(scb) == CAM_SCSI_STATUS_ERROR) {
1765                 ahc_linux_handle_scsi_status(ahc, cmd->device, scb);
1766         }
1767
1768         if (dev->openings == 1
1769          && ahc_get_transaction_status(scb) == CAM_REQ_CMP
1770          && ahc_get_scsi_status(scb) != SCSI_STATUS_QUEUE_FULL)
1771                 dev->tag_success_count++;
1772         /*
1773          * Some devices deal with temporary internal resource
1774          * shortages by returning queue full.  When the queue
1775          * full occurrs, we throttle back.  Slowly try to get
1776          * back to our previous queue depth.
1777          */
1778         if ((dev->openings + dev->active) < dev->maxtags
1779          && dev->tag_success_count > AHC_TAG_SUCCESS_INTERVAL) {
1780                 dev->tag_success_count = 0;
1781                 dev->openings++;
1782         }
1783
1784         if (dev->active == 0)
1785                 dev->commands_since_idle_or_otag = 0;
1786
1787         if ((scb->flags & SCB_RECOVERY_SCB) != 0) {
1788                 printf("Recovery SCB completes\n");
1789                 if (ahc_get_transaction_status(scb) == CAM_BDR_SENT
1790                  || ahc_get_transaction_status(scb) == CAM_REQ_ABORTED)
1791                         ahc_set_transaction_status(scb, CAM_CMD_TIMEOUT);
1792
1793                 if (ahc->platform_data->eh_done)
1794                         complete(ahc->platform_data->eh_done);
1795         }
1796
1797         ahc_free_scb(ahc, scb);
1798         ahc_linux_queue_cmd_complete(ahc, cmd);
1799 }
1800
1801 static void
1802 ahc_linux_handle_scsi_status(struct ahc_softc *ahc,
1803                              struct scsi_device *sdev, struct scb *scb)
1804 {
1805         struct  ahc_devinfo devinfo;
1806         struct ahc_linux_device *dev = scsi_transport_device_data(sdev);
1807
1808         ahc_compile_devinfo(&devinfo,
1809                             ahc->our_id,
1810                             sdev->sdev_target->id, sdev->lun,
1811                             sdev->sdev_target->channel == 0 ? 'A' : 'B',
1812                             ROLE_INITIATOR);
1813
1814         /*
1815          * We don't currently trust the mid-layer to
1816          * properly deal with queue full or busy.  So,
1817          * when one occurs, we tell the mid-layer to
1818          * unconditionally requeue the command to us
1819          * so that we can retry it ourselves.  We also
1820          * implement our own throttling mechanism so
1821          * we don't clobber the device with too many
1822          * commands.
1823          */
1824         switch (ahc_get_scsi_status(scb)) {
1825         default:
1826                 break;
1827         case SCSI_STATUS_CHECK_COND:
1828         case SCSI_STATUS_CMD_TERMINATED:
1829         {
1830                 struct scsi_cmnd *cmd;
1831
1832                 /*
1833                  * Copy sense information to the OS's cmd
1834                  * structure if it is available.
1835                  */
1836                 cmd = scb->io_ctx;
1837                 if (scb->flags & SCB_SENSE) {
1838                         u_int sense_size;
1839
1840                         sense_size = min(sizeof(struct scsi_sense_data)
1841                                        - ahc_get_sense_residual(scb),
1842                                          (u_long)sizeof(cmd->sense_buffer));
1843                         memcpy(cmd->sense_buffer,
1844                                ahc_get_sense_buf(ahc, scb), sense_size);
1845                         if (sense_size < sizeof(cmd->sense_buffer))
1846                                 memset(&cmd->sense_buffer[sense_size], 0,
1847                                        sizeof(cmd->sense_buffer) - sense_size);
1848                         cmd->result |= (DRIVER_SENSE << 24);
1849 #ifdef AHC_DEBUG
1850                         if (ahc_debug & AHC_SHOW_SENSE) {
1851                                 int i;
1852
1853                                 printf("Copied %d bytes of sense data:",
1854                                        sense_size);
1855                                 for (i = 0; i < sense_size; i++) {
1856                                         if ((i & 0xF) == 0)
1857                                                 printf("\n");
1858                                         printf("0x%x ", cmd->sense_buffer[i]);
1859                                 }
1860                                 printf("\n");
1861                         }
1862 #endif
1863                 }
1864                 break;
1865         }
1866         case SCSI_STATUS_QUEUE_FULL:
1867         {
1868                 /*
1869                  * By the time the core driver has returned this
1870                  * command, all other commands that were queued
1871                  * to us but not the device have been returned.
1872                  * This ensures that dev->active is equal to
1873                  * the number of commands actually queued to
1874                  * the device.
1875                  */
1876                 dev->tag_success_count = 0;
1877                 if (dev->active != 0) {
1878                         /*
1879                          * Drop our opening count to the number
1880                          * of commands currently outstanding.
1881                          */
1882                         dev->openings = 0;
1883 /*
1884                         ahc_print_path(ahc, scb);
1885                         printf("Dropping tag count to %d\n", dev->active);
1886  */
1887                         if (dev->active == dev->tags_on_last_queuefull) {
1888
1889                                 dev->last_queuefull_same_count++;
1890                                 /*
1891                                  * If we repeatedly see a queue full
1892                                  * at the same queue depth, this
1893                                  * device has a fixed number of tag
1894                                  * slots.  Lock in this tag depth
1895                                  * so we stop seeing queue fulls from
1896                                  * this device.
1897                                  */
1898                                 if (dev->last_queuefull_same_count
1899                                  == AHC_LOCK_TAGS_COUNT) {
1900                                         dev->maxtags = dev->active;
1901                                         ahc_print_path(ahc, scb);
1902                                         printf("Locking max tag count at %d\n",
1903                                                dev->active);
1904                                 }
1905                         } else {
1906                                 dev->tags_on_last_queuefull = dev->active;
1907                                 dev->last_queuefull_same_count = 0;
1908                         }
1909                         ahc_set_transaction_status(scb, CAM_REQUEUE_REQ);
1910                         ahc_set_scsi_status(scb, SCSI_STATUS_OK);
1911                         ahc_platform_set_tags(ahc, sdev, &devinfo,
1912                                      (dev->flags & AHC_DEV_Q_BASIC)
1913                                    ? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
1914                         break;
1915                 }
1916                 /*
1917                  * Drop down to a single opening, and treat this
1918                  * as if the target returned BUSY SCSI status.
1919                  */
1920                 dev->openings = 1;
1921                 ahc_set_scsi_status(scb, SCSI_STATUS_BUSY);
1922                 ahc_platform_set_tags(ahc, sdev, &devinfo,
1923                              (dev->flags & AHC_DEV_Q_BASIC)
1924                            ? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED);
1925                 break;
1926         }
1927         }
1928 }
1929
1930 static void
1931 ahc_linux_queue_cmd_complete(struct ahc_softc *ahc, struct scsi_cmnd *cmd)
1932 {
1933         /*
1934          * Map CAM error codes into Linux Error codes.  We
1935          * avoid the conversion so that the DV code has the
1936          * full error information available when making
1937          * state change decisions.
1938          */
1939         {
1940                 u_int new_status;
1941
1942                 switch (ahc_cmd_get_transaction_status(cmd)) {
1943                 case CAM_REQ_INPROG:
1944                 case CAM_REQ_CMP:
1945                 case CAM_SCSI_STATUS_ERROR:
1946                         new_status = DID_OK;
1947                         break;
1948                 case CAM_REQ_ABORTED:
1949                         new_status = DID_ABORT;
1950                         break;
1951                 case CAM_BUSY:
1952                         new_status = DID_BUS_BUSY;
1953                         break;
1954                 case CAM_REQ_INVALID:
1955                 case CAM_PATH_INVALID:
1956                         new_status = DID_BAD_TARGET;
1957                         break;
1958                 case CAM_SEL_TIMEOUT:
1959                         new_status = DID_NO_CONNECT;
1960                         break;
1961                 case CAM_SCSI_BUS_RESET:
1962                 case CAM_BDR_SENT:
1963                         new_status = DID_RESET;
1964                         break;
1965                 case CAM_UNCOR_PARITY:
1966                         new_status = DID_PARITY;
1967                         break;
1968                 case CAM_CMD_TIMEOUT:
1969                         new_status = DID_TIME_OUT;
1970                         break;
1971                 case CAM_UA_ABORT:
1972                 case CAM_REQ_CMP_ERR:
1973                 case CAM_AUTOSENSE_FAIL:
1974                 case CAM_NO_HBA:
1975                 case CAM_DATA_RUN_ERR:
1976                 case CAM_UNEXP_BUSFREE:
1977                 case CAM_SEQUENCE_FAIL:
1978                 case CAM_CCB_LEN_ERR:
1979                 case CAM_PROVIDE_FAIL:
1980                 case CAM_REQ_TERMIO:
1981                 case CAM_UNREC_HBA_ERROR:
1982                 case CAM_REQ_TOO_BIG:
1983                         new_status = DID_ERROR;
1984                         break;
1985                 case CAM_REQUEUE_REQ:
1986                         new_status = DID_REQUEUE;
1987                         break;
1988                 default:
1989                         /* We should never get here */
1990                         new_status = DID_ERROR;
1991                         break;
1992                 }
1993
1994                 ahc_cmd_set_transaction_status(cmd, new_status);
1995         }
1996
1997         cmd->scsi_done(cmd);
1998 }
1999
2000 static void
2001 ahc_linux_freeze_simq(struct ahc_softc *ahc)
2002 {
2003         unsigned long s;
2004
2005         ahc_lock(ahc, &s);
2006         ahc->platform_data->qfrozen++;
2007         if (ahc->platform_data->qfrozen == 1) {
2008                 scsi_block_requests(ahc->platform_data->host);
2009
2010                 /* XXX What about Twin channels? */
2011                 ahc_platform_abort_scbs(ahc, CAM_TARGET_WILDCARD, ALL_CHANNELS,
2012                                         CAM_LUN_WILDCARD, SCB_LIST_NULL,
2013                                         ROLE_INITIATOR, CAM_REQUEUE_REQ);
2014         }
2015         ahc_unlock(ahc, &s);
2016 }
2017
2018 static void
2019 ahc_linux_release_simq(struct ahc_softc *ahc)
2020 {
2021         u_long s;
2022         int    unblock_reqs;
2023
2024         unblock_reqs = 0;
2025         ahc_lock(ahc, &s);
2026         if (ahc->platform_data->qfrozen > 0)
2027                 ahc->platform_data->qfrozen--;
2028         if (ahc->platform_data->qfrozen == 0)
2029                 unblock_reqs = 1;
2030         ahc_unlock(ahc, &s);
2031         /*
2032          * There is still a race here.  The mid-layer
2033          * should keep its own freeze count and use
2034          * a bottom half handler to run the queues
2035          * so we can unblock with our own lock held.
2036          */
2037         if (unblock_reqs)
2038                 scsi_unblock_requests(ahc->platform_data->host);
2039 }
2040
2041 static int
2042 ahc_linux_queue_recovery_cmd(struct scsi_cmnd *cmd, scb_flag flag)
2043 {
2044         struct ahc_softc *ahc;
2045         struct ahc_linux_device *dev;
2046         struct scb *pending_scb;
2047         u_int  saved_scbptr;
2048         u_int  active_scb_index;
2049         u_int  last_phase;
2050         u_int  saved_scsiid;
2051         u_int  cdb_byte;
2052         int    retval;
2053         int    was_paused;
2054         int    paused;
2055         int    wait;
2056         int    disconnected;
2057         unsigned long flags;
2058
2059         pending_scb = NULL;
2060         paused = FALSE;
2061         wait = FALSE;
2062         ahc = *(struct ahc_softc **)cmd->device->host->hostdata;
2063
2064         scmd_printk(KERN_INFO, cmd, "Attempting to queue a%s message\n",
2065                flag == SCB_ABORT ? "n ABORT" : " TARGET RESET");
2066
2067         printf("CDB:");
2068         for (cdb_byte = 0; cdb_byte < cmd->cmd_len; cdb_byte++)
2069                 printf(" 0x%x", cmd->cmnd[cdb_byte]);
2070         printf("\n");
2071
2072         ahc_lock(ahc, &flags);
2073
2074         /*
2075          * First determine if we currently own this command.
2076          * Start by searching the device queue.  If not found
2077          * there, check the pending_scb list.  If not found
2078          * at all, and the system wanted us to just abort the
2079          * command, return success.
2080          */
2081         dev = scsi_transport_device_data(cmd->device);
2082
2083         if (dev == NULL) {
2084                 /*
2085                  * No target device for this command exists,
2086                  * so we must not still own the command.
2087                  */
2088                 printf("%s:%d:%d:%d: Is not an active device\n",
2089                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2090                        cmd->device->lun);
2091                 retval = SUCCESS;
2092                 goto no_cmd;
2093         }
2094
2095         if ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED)) == 0
2096          && ahc_search_untagged_queues(ahc, cmd, cmd->device->id,
2097                                        cmd->device->channel + 'A',
2098                                        cmd->device->lun,
2099                                        CAM_REQ_ABORTED, SEARCH_COMPLETE) != 0) {
2100                 printf("%s:%d:%d:%d: Command found on untagged queue\n",
2101                        ahc_name(ahc), cmd->device->channel, cmd->device->id,
2102                        cmd->device->lun);
2103                 retval = SUCCESS;
2104                 goto done;
2105         }
2106
2107         /*
2108          * See if we can find a matching cmd in the pending list.
2109          */
2110         LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
2111                 if (pending_scb->io_ctx == cmd)
2112                         break;
2113         }
2114
2115         if (pending_scb == NULL && flag == SCB_DEVICE_RESET) {
2116
2117                 /* Any SCB for this device will do for a target reset */
2118                 LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
2119                         if (ahc_match_scb(ahc, pending_scb, scmd_id(cmd),
2120                                           scmd_channel(cmd) + 'A',
2121                                           CAM_LUN_WILDCARD,
2122                                           SCB_LIST_NULL, ROLE_INITIATOR))
2123                                 break;
2124                 }
2125         }
2126
2127         if (pending_scb == NULL) {
2128                 scmd_printk(KERN_INFO, cmd, "Command not found\n");
2129                 goto no_cmd;
2130         }
2131
2132         if ((pending_scb->flags & SCB_RECOVERY_SCB) != 0) {
2133                 /*
2134                  * We can't queue two recovery actions using the same SCB
2135                  */
2136                 retval = FAILED;
2137                 goto  done;
2138         }
2139
2140         /*
2141          * Ensure that the card doesn't do anything
2142          * behind our back and that we didn't "just" miss
2143          * an interrupt that would affect this cmd.
2144          */
2145         was_paused = ahc_is_paused(ahc);
2146         ahc_pause_and_flushwork(ahc);
2147         paused = TRUE;
2148
2149         if ((pending_scb->flags & SCB_ACTIVE) == 0) {
2150                 scmd_printk(KERN_INFO, cmd, "Command already completed\n");
2151                 goto no_cmd;
2152         }
2153
2154         printf("%s: At time of recovery, card was %spaused\n",
2155                ahc_name(ahc), was_paused ? "" : "not ");
2156         ahc_dump_card_state(ahc);
2157
2158         disconnected = TRUE;
2159         if (flag == SCB_ABORT) {
2160                 if (ahc_search_qinfifo(ahc, cmd->device->id,
2161                                        cmd->device->channel + 'A',
2162                                        cmd->device->lun,
2163                                        pending_scb->hscb->tag,
2164                                        ROLE_INITIATOR, CAM_REQ_ABORTED,
2165                                        SEARCH_COMPLETE) > 0) {
2166                         printf("%s:%d:%d:%d: Cmd aborted from QINFIFO\n",
2167                                ahc_name(ahc), cmd->device->channel,
2168                                         cmd->device->id, cmd->device->lun);
2169                         retval = SUCCESS;
2170                         goto done;
2171                 }
2172         } else if (ahc_search_qinfifo(ahc, cmd->device->id,
2173                                       cmd->device->channel + 'A',
2174                                       cmd->device->lun, pending_scb->hscb->tag,
2175                                       ROLE_INITIATOR, /*status*/0,
2176                                       SEARCH_COUNT) > 0) {
2177                 disconnected = FALSE;
2178         }
2179
2180         if (disconnected && (ahc_inb(ahc, SEQ_FLAGS) & NOT_IDENTIFIED) == 0) {
2181                 struct scb *bus_scb;
2182
2183                 bus_scb = ahc_lookup_scb(ahc, ahc_inb(ahc, SCB_TAG));
2184                 if (bus_scb == pending_scb)
2185                         disconnected = FALSE;
2186                 else if (flag != SCB_ABORT
2187                       && ahc_inb(ahc, SAVED_SCSIID) == pending_scb->hscb->scsiid
2188                       && ahc_inb(ahc, SAVED_LUN) == SCB_GET_LUN(pending_scb))
2189                         disconnected = FALSE;
2190         }
2191
2192         /*
2193          * At this point, pending_scb is the scb associated with the
2194          * passed in command.  That command is currently active on the
2195          * bus, is in the disconnected state, or we're hoping to find
2196          * a command for the same target active on the bus to abuse to
2197          * send a BDR.  Queue the appropriate message based on which of
2198          * these states we are in.
2199          */
2200         last_phase = ahc_inb(ahc, LASTPHASE);
2201         saved_scbptr = ahc_inb(ahc, SCBPTR);
2202         active_scb_index = ahc_inb(ahc, SCB_TAG);
2203         saved_scsiid = ahc_inb(ahc, SAVED_SCSIID);
2204         if (last_phase != P_BUSFREE
2205          && (pending_scb->hscb->tag == active_scb_index
2206           || (flag == SCB_DEVICE_RESET
2207            && SCSIID_TARGET(ahc, saved_scsiid) == scmd_id(cmd)))) {
2208
2209                 /*
2210                  * We're active on the bus, so assert ATN
2211                  * and hope that the target responds.
2212                  */
2213                 pending_scb = ahc_lookup_scb(ahc, active_scb_index);
2214                 pending_scb->flags |= SCB_RECOVERY_SCB|flag;
2215                 ahc_outb(ahc, MSG_OUT, HOST_MSG);
2216                 ahc_outb(ahc, SCSISIGO, last_phase|ATNO);
2217                 scmd_printk(KERN_INFO, cmd, "Device is active, asserting ATN\n");
2218                 wait = TRUE;
2219         } else if (disconnected) {
2220
2221                 /*
2222                  * Actually re-queue this SCB in an attempt
2223                  * to select the device before it reconnects.
2224                  * In either case (selection or reselection),
2225                  * we will now issue the approprate message
2226                  * to the timed-out device.
2227                  *
2228                  * Set the MK_MESSAGE control bit indicating
2229                  * that we desire to send a message.  We
2230                  * also set the disconnected flag since
2231                  * in the paging case there is no guarantee
2232                  * that our SCB control byte matches the
2233                  * version on the card.  We don't want the
2234                  * sequencer to abort the command thinking
2235                  * an unsolicited reselection occurred.
2236                  */
2237                 pending_scb->hscb->control |= MK_MESSAGE|DISCONNECTED;
2238                 pending_scb->flags |= SCB_RECOVERY_SCB|flag;
2239
2240                 /*
2241                  * Remove any cached copy of this SCB in the
2242                  * disconnected list in preparation for the
2243                  * queuing of our abort SCB.  We use the
2244                  * same element in the SCB, SCB_NEXT, for
2245                  * both the qinfifo and the disconnected list.
2246                  */
2247                 ahc_search_disc_list(ahc, cmd->device->id,
2248                                      cmd->device->channel + 'A',
2249                                      cmd->device->lun, pending_scb->hscb->tag,
2250                                      /*stop_on_first*/TRUE,
2251                                      /*remove*/TRUE,
2252                                      /*save_state*/FALSE);
2253
2254                 /*
2255                  * In the non-paging case, the sequencer will
2256                  * never re-reference the in-core SCB.
2257                  * To make sure we are notified during
2258                  * reslection, set the MK_MESSAGE flag in
2259                  * the card's copy of the SCB.
2260                  */
2261                 if ((ahc->flags & AHC_PAGESCBS) == 0) {
2262                         ahc_outb(ahc, SCBPTR, pending_scb->hscb->tag);
2263                         ahc_outb(ahc, SCB_CONTROL,
2264                                  ahc_inb(ahc, SCB_CONTROL)|MK_MESSAGE);
2265                 }
2266
2267                 /*
2268                  * Clear out any entries in the QINFIFO first
2269                  * so we are the next SCB for this target
2270                  * to run.
2271                  */
2272                 ahc_search_qinfifo(ahc, cmd->device->id,
2273                                    cmd->device->channel + 'A',
2274                                    cmd->device->lun, SCB_LIST_NULL,
2275                                    ROLE_INITIATOR, CAM_REQUEUE_REQ,
2276                                    SEARCH_COMPLETE);
2277                 ahc_qinfifo_requeue_tail(ahc, pending_scb);
2278                 ahc_outb(ahc, SCBPTR, saved_scbptr);
2279                 ahc_print_path(ahc, pending_scb);
2280                 printf("Device is disconnected, re-queuing SCB\n");
2281                 wait = TRUE;
2282         } else {
2283                 scmd_printk(KERN_INFO, cmd, "Unable to deliver message\n");
2284                 retval = FAILED;
2285                 goto done;
2286         }
2287
2288 no_cmd:
2289         /*
2290          * Our assumption is that if we don't have the command, no
2291          * recovery action was required, so we return success.  Again,
2292          * the semantics of the mid-layer recovery engine are not
2293          * well defined, so this may change in time.
2294          */
2295         retval = SUCCESS;
2296 done:
2297         if (paused)
2298                 ahc_unpause(ahc);
2299         if (wait) {
2300                 DECLARE_COMPLETION_ONSTACK(done);
2301
2302                 ahc->platform_data->eh_done = &done;
2303                 ahc_unlock(ahc, &flags);
2304
2305                 printf("Recovery code sleeping\n");
2306                 if (!wait_for_completion_timeout(&done, 5 * HZ)) {
2307                         ahc_lock(ahc, &flags);
2308                         ahc->platform_data->eh_done = NULL;
2309                         ahc_unlock(ahc, &flags);
2310
2311                         printf("Timer Expired\n");
2312                         retval = FAILED;
2313                 }
2314                 printf("Recovery code awake\n");
2315         } else
2316                 ahc_unlock(ahc, &flags);
2317         return (retval);
2318 }
2319
2320 void
2321 ahc_platform_dump_card_state(struct ahc_softc *ahc)
2322 {
2323 }
2324
2325 static void ahc_linux_set_width(struct scsi_target *starget, int width)
2326 {
2327         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2328         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2329         struct ahc_devinfo devinfo;
2330         unsigned long flags;
2331
2332         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2333                             starget->channel + 'A', ROLE_INITIATOR);
2334         ahc_lock(ahc, &flags);
2335         ahc_set_width(ahc, &devinfo, width, AHC_TRANS_GOAL, FALSE);
2336         ahc_unlock(ahc, &flags);
2337 }
2338
2339 static void ahc_linux_set_period(struct scsi_target *starget, int period)
2340 {
2341         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2342         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2343         struct ahc_tmode_tstate *tstate;
2344         struct ahc_initiator_tinfo *tinfo
2345                 = ahc_fetch_transinfo(ahc,
2346                                       starget->channel + 'A',
2347                                       shost->this_id, starget->id, &tstate);
2348         struct ahc_devinfo devinfo;
2349         unsigned int ppr_options = tinfo->goal.ppr_options;
2350         unsigned long flags;
2351         unsigned long offset = tinfo->goal.offset;
2352         struct ahc_syncrate *syncrate;
2353
2354         if (offset == 0)
2355                 offset = MAX_OFFSET;
2356
2357         if (period < 9)
2358                 period = 9;     /* 12.5ns is our minimum */
2359         if (period == 9)
2360                 ppr_options |= MSG_EXT_PPR_DT_REQ;
2361
2362         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2363                             starget->channel + 'A', ROLE_INITIATOR);
2364
2365         /* all PPR requests apart from QAS require wide transfers */
2366         if (ppr_options & ~MSG_EXT_PPR_QAS_REQ) {
2367                 if (spi_width(starget) == 0)
2368                         ppr_options &= MSG_EXT_PPR_QAS_REQ;
2369         }
2370
2371         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2372         ahc_lock(ahc, &flags);
2373         ahc_set_syncrate(ahc, &devinfo, syncrate, period, offset,
2374                          ppr_options, AHC_TRANS_GOAL, FALSE);
2375         ahc_unlock(ahc, &flags);
2376 }
2377
2378 static void ahc_linux_set_offset(struct scsi_target *starget, int offset)
2379 {
2380         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2381         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2382         struct ahc_tmode_tstate *tstate;
2383         struct ahc_initiator_tinfo *tinfo
2384                 = ahc_fetch_transinfo(ahc,
2385                                       starget->channel + 'A',
2386                                       shost->this_id, starget->id, &tstate);
2387         struct ahc_devinfo devinfo;
2388         unsigned int ppr_options = 0;
2389         unsigned int period = 0;
2390         unsigned long flags;
2391         struct ahc_syncrate *syncrate = NULL;
2392
2393         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2394                             starget->channel + 'A', ROLE_INITIATOR);
2395         if (offset != 0) {
2396                 syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2397                 period = tinfo->goal.period;
2398                 ppr_options = tinfo->goal.ppr_options;
2399         }
2400         ahc_lock(ahc, &flags);
2401         ahc_set_syncrate(ahc, &devinfo, syncrate, period, offset,
2402                          ppr_options, AHC_TRANS_GOAL, FALSE);
2403         ahc_unlock(ahc, &flags);
2404 }
2405
2406 static void ahc_linux_set_dt(struct scsi_target *starget, int dt)
2407 {
2408         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2409         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2410         struct ahc_tmode_tstate *tstate;
2411         struct ahc_initiator_tinfo *tinfo
2412                 = ahc_fetch_transinfo(ahc,
2413                                       starget->channel + 'A',
2414                                       shost->this_id, starget->id, &tstate);
2415         struct ahc_devinfo devinfo;
2416         unsigned int ppr_options = tinfo->goal.ppr_options
2417                 & ~MSG_EXT_PPR_DT_REQ;
2418         unsigned int period = tinfo->goal.period;
2419         unsigned int width = tinfo->goal.width;
2420         unsigned long flags;
2421         struct ahc_syncrate *syncrate;
2422
2423         if (dt) {
2424                 ppr_options |= MSG_EXT_PPR_DT_REQ;
2425                 if (!width)
2426                         ahc_linux_set_width(starget, 1);
2427         } else if (period == 9)
2428                 period = 10;    /* if resetting DT, period must be >= 25ns */
2429
2430         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2431                             starget->channel + 'A', ROLE_INITIATOR);
2432         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options,AHC_SYNCRATE_DT);
2433         ahc_lock(ahc, &flags);
2434         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2435                          ppr_options, AHC_TRANS_GOAL, FALSE);
2436         ahc_unlock(ahc, &flags);
2437 }
2438
2439 #if 0
2440 /* FIXME: This code claims to support IU and QAS.  However, the actual
2441  * sequencer code and aic7xxx_core have no support for these parameters and
2442  * will get into a bad state if they're negotiated.  Do not enable this
2443  * unless you know what you're doing */
2444 static void ahc_linux_set_qas(struct scsi_target *starget, int qas)
2445 {
2446         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2447         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2448         struct ahc_tmode_tstate *tstate;
2449         struct ahc_initiator_tinfo *tinfo
2450                 = ahc_fetch_transinfo(ahc,
2451                                       starget->channel + 'A',
2452                                       shost->this_id, starget->id, &tstate);
2453         struct ahc_devinfo devinfo;
2454         unsigned int ppr_options = tinfo->goal.ppr_options
2455                 & ~MSG_EXT_PPR_QAS_REQ;
2456         unsigned int period = tinfo->goal.period;
2457         unsigned long flags;
2458         struct ahc_syncrate *syncrate;
2459
2460         if (qas)
2461                 ppr_options |= MSG_EXT_PPR_QAS_REQ;
2462
2463         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2464                             starget->channel + 'A', ROLE_INITIATOR);
2465         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2466         ahc_lock(ahc, &flags);
2467         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2468                          ppr_options, AHC_TRANS_GOAL, FALSE);
2469         ahc_unlock(ahc, &flags);
2470 }
2471
2472 static void ahc_linux_set_iu(struct scsi_target *starget, int iu)
2473 {
2474         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2475         struct ahc_softc *ahc = *((struct ahc_softc **)shost->hostdata);
2476         struct ahc_tmode_tstate *tstate;
2477         struct ahc_initiator_tinfo *tinfo
2478                 = ahc_fetch_transinfo(ahc,
2479                                       starget->channel + 'A',
2480                                       shost->this_id, starget->id, &tstate);
2481         struct ahc_devinfo devinfo;
2482         unsigned int ppr_options = tinfo->goal.ppr_options
2483                 & ~MSG_EXT_PPR_IU_REQ;
2484         unsigned int period = tinfo->goal.period;
2485         unsigned long flags;
2486         struct ahc_syncrate *syncrate;
2487
2488         if (iu)
2489                 ppr_options |= MSG_EXT_PPR_IU_REQ;
2490
2491         ahc_compile_devinfo(&devinfo, shost->this_id, starget->id, 0,
2492                             starget->channel + 'A', ROLE_INITIATOR);
2493         syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, AHC_SYNCRATE_DT);
2494         ahc_lock(ahc, &flags);
2495         ahc_set_syncrate(ahc, &devinfo, syncrate, period, tinfo->goal.offset,
2496                          ppr_options, AHC_TRANS_GOAL, FALSE);
2497         ahc_unlock(ahc, &flags);
2498 }
2499 #endif
2500
2501 static void ahc_linux_get_signalling(struct Scsi_Host *shost)
2502 {
2503         struct ahc_softc *ahc = *(struct ahc_softc **)shost->hostdata;
2504         unsigned long flags;
2505         u8 mode;
2506
2507         if (!(ahc->features & AHC_ULTRA2)) {
2508                 /* non-LVD chipset, may not have SBLKCTL reg */
2509                 spi_signalling(shost) =
2510                         ahc->features & AHC_HVD ?
2511                         SPI_SIGNAL_HVD :
2512                         SPI_SIGNAL_SE;
2513                 return;
2514         }
2515
2516         ahc_lock(ahc, &flags);
2517         ahc_pause(ahc);
2518         mode = ahc_inb(ahc, SBLKCTL);
2519         ahc_unpause(ahc);
2520         ahc_unlock(ahc, &flags);
2521
2522         if (mode & ENAB40)
2523                 spi_signalling(shost) = SPI_SIGNAL_LVD;
2524         else if (mode & ENAB20)
2525                 spi_signalling(shost) = SPI_SIGNAL_SE;
2526         else
2527                 spi_signalling(shost) = SPI_SIGNAL_UNKNOWN;
2528 }
2529
2530 static struct spi_function_template ahc_linux_transport_functions = {
2531         .set_offset     = ahc_linux_set_offset,
2532         .show_offset    = 1,
2533         .set_period     = ahc_linux_set_period,
2534         .show_period    = 1,
2535         .set_width      = ahc_linux_set_width,
2536         .show_width     = 1,
2537         .set_dt         = ahc_linux_set_dt,
2538         .show_dt        = 1,
2539 #if 0
2540         .set_iu         = ahc_linux_set_iu,
2541         .show_iu        = 1,
2542         .set_qas        = ahc_linux_set_qas,
2543         .show_qas       = 1,
2544 #endif
2545         .get_signalling = ahc_linux_get_signalling,
2546 };
2547
2548
2549
2550 static int __init
2551 ahc_linux_init(void)
2552 {
2553         /*
2554          * If we've been passed any parameters, process them now.
2555          */
2556         if (aic7xxx)
2557                 aic7xxx_setup(aic7xxx);
2558
2559         ahc_linux_transport_template =
2560                 spi_attach_transport(&ahc_linux_transport_functions);
2561         if (!ahc_linux_transport_template)
2562                 return -ENODEV;
2563
2564         scsi_transport_reserve_device(ahc_linux_transport_template,
2565                                       sizeof(struct ahc_linux_device));
2566
2567         ahc_linux_pci_init();
2568         ahc_linux_eisa_init();
2569         return 0;
2570 }
2571
2572 static void
2573 ahc_linux_exit(void)
2574 {
2575         ahc_linux_pci_exit();
2576         ahc_linux_eisa_exit();
2577         spi_release_transport(ahc_linux_transport_template);
2578 }
2579
2580 module_init(ahc_linux_init);
2581 module_exit(ahc_linux_exit);