git.oblomov.eu Git - linux-2.6/blob - drivers/firewire/fw-sbp2.c

   1 /*
   2  * SBP2 driver (SCSI over IEEE1394)
   3  *
   4  * Copyright (C) 2005-2007  Kristian Hoegsberg <krh@bitplanet.net>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software Foundation,
  18  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 /*
  22  * The basic structure of this driver is based on the old storage driver,
  23  * drivers/ieee1394/sbp2.c, originally written by
  24  *     James Goodwin <jamesg@filanet.com>
  25  * with later contributions and ongoing maintenance from
  26  *     Ben Collins <bcollins@debian.org>,
  27  *     Stefan Richter <stefanr@s5r6.in-berlin.de>
  28  * and many others.
  29  */
  30
  31 #include <linux/kernel.h>
  32 #include <linux/module.h>
  33 #include <linux/moduleparam.h>
  34 #include <linux/mod_devicetable.h>
  35 #include <linux/device.h>
  36 #include <linux/scatterlist.h>
  37 #include <linux/dma-mapping.h>
  38 #include <linux/blkdev.h>
  39 #include <linux/string.h>
  40 #include <linux/stringify.h>
  41 #include <linux/timer.h>
  42 #include <linux/workqueue.h>
  43 #include <asm/system.h>
  44
  45 #include <scsi/scsi.h>
  46 #include <scsi/scsi_cmnd.h>
  47 #include <scsi/scsi_device.h>
  48 #include <scsi/scsi_host.h>
  49
  50 #include "fw-transaction.h"
  51 #include "fw-topology.h"
  52 #include "fw-device.h"
  53
  54 /*
  55  * So far only bridges from Oxford Semiconductor are known to support
  56  * concurrent logins. Depending on firmware, four or two concurrent logins
  57  * are possible on OXFW911 and newer Oxsemi bridges.
  58  *
  59  * Concurrent logins are useful together with cluster filesystems.
  60  */
  61 static int sbp2_param_exclusive_login = 1;
  62 module_param_named(exclusive_login, sbp2_param_exclusive_login, bool, 0644);
  63 MODULE_PARM_DESC(exclusive_login, "Exclusive login to sbp2 device "
  64                  "(default = Y, use N for concurrent initiators)");
  65
  66 /*
  67  * Flags for firmware oddities
  68  *
  69  * - 128kB max transfer
  70  *   Limit transfer size. Necessary for some old bridges.
  71  *
  72  * - 36 byte inquiry
  73  *   When scsi_mod probes the device, let the inquiry command look like that
  74  *   from MS Windows.
  75  *
  76  * - skip mode page 8
  77  *   Suppress sending of mode_sense for mode page 8 if the device pretends to
  78  *   support the SCSI Primary Block commands instead of Reduced Block Commands.
  79  *
  80  * - fix capacity
  81  *   Tell sd_mod to correct the last sector number reported by read_capacity.
  82  *   Avoids access beyond actual disk limits on devices with an off-by-one bug.
  83  *   Don't use this with devices which don't have this bug.
  84  *
  85  * - override internal blacklist
  86  *   Instead of adding to the built-in blacklist, use only the workarounds
  87  *   specified in the module load parameter.
  88  *   Useful if a blacklist entry interfered with a non-broken device.
  89  */
  90 #define SBP2_WORKAROUND_128K_MAX_TRANS  0x1
  91 #define SBP2_WORKAROUND_INQUIRY_36      0x2
  92 #define SBP2_WORKAROUND_MODE_SENSE_8    0x4
  93 #define SBP2_WORKAROUND_FIX_CAPACITY    0x8
  94 #define SBP2_WORKAROUND_OVERRIDE        0x100
  95
  96 static int sbp2_param_workarounds;
  97 module_param_named(workarounds, sbp2_param_workarounds, int, 0644);
  98 MODULE_PARM_DESC(workarounds, "Work around device bugs (default = 0"
  99         ", 128kB max transfer = " __stringify(SBP2_WORKAROUND_128K_MAX_TRANS)
 100         ", 36 byte inquiry = "    __stringify(SBP2_WORKAROUND_INQUIRY_36)
 101         ", skip mode page 8 = "   __stringify(SBP2_WORKAROUND_MODE_SENSE_8)
 102         ", fix capacity = "       __stringify(SBP2_WORKAROUND_FIX_CAPACITY)
 103         ", override internal blacklist = " __stringify(SBP2_WORKAROUND_OVERRIDE)
 104         ", or a combination)");
 105
 106 /* I don't know why the SCSI stack doesn't define something like this... */
 107 typedef void (*scsi_done_fn_t)(struct scsi_cmnd *);
 108
 109 static const char sbp2_driver_name[] = "sbp2";
 110
 111 /*
 112  * We create one struct sbp2_logical_unit per SBP-2 Logical Unit Number Entry
 113  * and one struct scsi_device per sbp2_logical_unit.
 114  */
 115 struct sbp2_logical_unit {
 116         struct sbp2_target *tgt;
 117         struct list_head link;
 118         struct scsi_device *sdev;
 119         struct fw_address_handler address_handler;
 120         struct list_head orb_list;
 121
 122         u64 command_block_agent_address;
 123         u16 lun;
 124         int login_id;
 125
 126         /*
 127          * The generation is updated once we've logged in or reconnected
 128          * to the logical unit.  Thus, I/O to the device will automatically
 129          * fail and get retried if it happens in a window where the device
 130          * is not ready, e.g. after a bus reset but before we reconnect.
 131          */
 132         int generation;
 133         int retries;
 134         struct delayed_work work;
 135 };
 136
 137 /*
 138  * We create one struct sbp2_target per IEEE 1212 Unit Directory
 139  * and one struct Scsi_Host per sbp2_target.
 140  */
 141 struct sbp2_target {
 142         struct kref kref;
 143         struct fw_unit *unit;
 144
 145         u64 management_agent_address;
 146         int directory_id;
 147         int node_id;
 148         int address_high;
 149
 150         unsigned workarounds;
 151         struct list_head lu_list;
 152
 153         unsigned int mgt_orb_timeout;
 154 };
 155
 156 /*
 157  * Per section 7.4.8 of the SBP-2 spec, a mgt_ORB_timeout value can be
 158  * provided in the config rom. Most devices do provide a value, which
 159  * we'll use for login management orbs, but with some sane limits.
 160  */
 161 #define SBP2_MIN_LOGIN_ORB_TIMEOUT      5000U   /* Timeout in ms */
 162 #define SBP2_MAX_LOGIN_ORB_TIMEOUT      40000U  /* Timeout in ms */
 163 #define SBP2_ORB_TIMEOUT                2000    /* Timeout in ms */
 164 #define SBP2_ORB_NULL                   0x80000000
 165 #define SBP2_MAX_SG_ELEMENT_LENGTH      0xf000
 166
 167 #define SBP2_DIRECTION_TO_MEDIA         0x0
 168 #define SBP2_DIRECTION_FROM_MEDIA       0x1
 169
 170 /* Unit directory keys */
 171 #define SBP2_CSR_UNIT_CHARACTERISTICS   0x3a
 172 #define SBP2_CSR_FIRMWARE_REVISION      0x3c
 173 #define SBP2_CSR_LOGICAL_UNIT_NUMBER    0x14
 174 #define SBP2_CSR_LOGICAL_UNIT_DIRECTORY 0xd4
 175
 176 /* Management orb opcodes */
 177 #define SBP2_LOGIN_REQUEST              0x0
 178 #define SBP2_QUERY_LOGINS_REQUEST       0x1
 179 #define SBP2_RECONNECT_REQUEST          0x3
 180 #define SBP2_SET_PASSWORD_REQUEST       0x4
 181 #define SBP2_LOGOUT_REQUEST             0x7
 182 #define SBP2_ABORT_TASK_REQUEST         0xb
 183 #define SBP2_ABORT_TASK_SET             0xc
 184 #define SBP2_LOGICAL_UNIT_RESET         0xe
 185 #define SBP2_TARGET_RESET_REQUEST       0xf
 186
 187 /* Offsets for command block agent registers */
 188 #define SBP2_AGENT_STATE                0x00
 189 #define SBP2_AGENT_RESET                0x04
 190 #define SBP2_ORB_POINTER                0x08
 191 #define SBP2_DOORBELL                   0x10
 192 #define SBP2_UNSOLICITED_STATUS_ENABLE  0x14
 193
 194 /* Status write response codes */
 195 #define SBP2_STATUS_REQUEST_COMPLETE    0x0
 196 #define SBP2_STATUS_TRANSPORT_FAILURE   0x1
 197 #define SBP2_STATUS_ILLEGAL_REQUEST     0x2
 198 #define SBP2_STATUS_VENDOR_DEPENDENT    0x3
 199
 200 #define STATUS_GET_ORB_HIGH(v)          ((v).status & 0xffff)
 201 #define STATUS_GET_SBP_STATUS(v)        (((v).status >> 16) & 0xff)
 202 #define STATUS_GET_LEN(v)               (((v).status >> 24) & 0x07)
 203 #define STATUS_GET_DEAD(v)              (((v).status >> 27) & 0x01)
 204 #define STATUS_GET_RESPONSE(v)          (((v).status >> 28) & 0x03)
 205 #define STATUS_GET_SOURCE(v)            (((v).status >> 30) & 0x03)
 206 #define STATUS_GET_ORB_LOW(v)           ((v).orb_low)
 207 #define STATUS_GET_DATA(v)              ((v).data)
 208
 209 struct sbp2_status {
 210         u32 status;
 211         u32 orb_low;
 212         u8 data[24];
 213 };
 214
 215 struct sbp2_pointer {
 216         u32 high;
 217         u32 low;
 218 };
 219
 220 struct sbp2_orb {
 221         struct fw_transaction t;
 222         struct kref kref;
 223         dma_addr_t request_bus;
 224         int rcode;
 225         struct sbp2_pointer pointer;
 226         void (*callback)(struct sbp2_orb * orb, struct sbp2_status * status);
 227         struct list_head link;
 228 };
 229
 230 #define MANAGEMENT_ORB_LUN(v)                   ((v))
 231 #define MANAGEMENT_ORB_FUNCTION(v)              ((v) << 16)
 232 #define MANAGEMENT_ORB_RECONNECT(v)             ((v) << 20)
 233 #define MANAGEMENT_ORB_EXCLUSIVE(v)             ((v) ? 1 << 28 : 0)
 234 #define MANAGEMENT_ORB_REQUEST_FORMAT(v)        ((v) << 29)
 235 #define MANAGEMENT_ORB_NOTIFY                   ((1) << 31)
 236
 237 #define MANAGEMENT_ORB_RESPONSE_LENGTH(v)       ((v))
 238 #define MANAGEMENT_ORB_PASSWORD_LENGTH(v)       ((v) << 16)
 239
 240 struct sbp2_management_orb {
 241         struct sbp2_orb base;
 242         struct {
 243                 struct sbp2_pointer password;
 244                 struct sbp2_pointer response;
 245                 u32 misc;
 246                 u32 length;
 247                 struct sbp2_pointer status_fifo;
 248         } request;
 249         __be32 response[4];
 250         dma_addr_t response_bus;
 251         struct completion done;
 252         struct sbp2_status status;
 253 };
 254
 255 #define LOGIN_RESPONSE_GET_LOGIN_ID(v)  ((v).misc & 0xffff)
 256 #define LOGIN_RESPONSE_GET_LENGTH(v)    (((v).misc >> 16) & 0xffff)
 257
 258 struct sbp2_login_response {
 259         u32 misc;
 260         struct sbp2_pointer command_block_agent;
 261         u32 reconnect_hold;
 262 };
 263 #define COMMAND_ORB_DATA_SIZE(v)        ((v))
 264 #define COMMAND_ORB_PAGE_SIZE(v)        ((v) << 16)
 265 #define COMMAND_ORB_PAGE_TABLE_PRESENT  ((1) << 19)
 266 #define COMMAND_ORB_MAX_PAYLOAD(v)      ((v) << 20)
 267 #define COMMAND_ORB_SPEED(v)            ((v) << 24)
 268 #define COMMAND_ORB_DIRECTION(v)        ((v) << 27)
 269 #define COMMAND_ORB_REQUEST_FORMAT(v)   ((v) << 29)
 270 #define COMMAND_ORB_NOTIFY              ((1) << 31)
 271
 272 struct sbp2_command_orb {
 273         struct sbp2_orb base;
 274         struct {
 275                 struct sbp2_pointer next;
 276                 struct sbp2_pointer data_descriptor;
 277                 u32 misc;
 278                 u8 command_block[12];
 279         } request;
 280         struct scsi_cmnd *cmd;
 281         scsi_done_fn_t done;
 282         struct sbp2_logical_unit *lu;
 283
 284         struct sbp2_pointer page_table[SG_ALL] __attribute__((aligned(8)));
 285         dma_addr_t page_table_bus;
 286 };
 287
 288 /*
 289  * List of devices with known bugs.
 290  *
 291  * The firmware_revision field, masked with 0xffff00, is the best
 292  * indicator for the type of bridge chip of a device.  It yields a few
 293  * false positives but this did not break correctly behaving devices
 294  * so far.  We use ~0 as a wildcard, since the 24 bit values we get
 295  * from the config rom can never match that.
 296  */
 297 static const struct {
 298         u32 firmware_revision;
 299         u32 model;
 300         unsigned workarounds;
 301 } sbp2_workarounds_table[] = {
 302         /* DViCO Momobay CX-1 with TSB42AA9 bridge */ {
 303                 .firmware_revision      = 0x002800,
 304                 .model                  = 0x001010,
 305                 .workarounds            = SBP2_WORKAROUND_INQUIRY_36 |
 306                                           SBP2_WORKAROUND_MODE_SENSE_8,
 307         },
 308         /* Initio bridges, actually only needed for some older ones */ {
 309                 .firmware_revision      = 0x000200,
 310                 .model                  = ~0,
 311                 .workarounds            = SBP2_WORKAROUND_INQUIRY_36,
 312         },
 313         /* Symbios bridge */ {
 314                 .firmware_revision      = 0xa0b800,
 315                 .model                  = ~0,
 316                 .workarounds            = SBP2_WORKAROUND_128K_MAX_TRANS,
 317         },
 318
 319         /*
 320          * There are iPods (2nd gen, 3rd gen) with model_id == 0, but
 321          * these iPods do not feature the read_capacity bug according
 322          * to one report.  Read_capacity behaviour as well as model_id
 323          * could change due to Apple-supplied firmware updates though.
 324          */
 325
 326         /* iPod 4th generation. */ {
 327                 .firmware_revision      = 0x0a2700,
 328                 .model                  = 0x000021,
 329                 .workarounds            = SBP2_WORKAROUND_FIX_CAPACITY,
 330         },
 331         /* iPod mini */ {
 332                 .firmware_revision      = 0x0a2700,
 333                 .model                  = 0x000023,
 334                 .workarounds            = SBP2_WORKAROUND_FIX_CAPACITY,
 335         },
 336         /* iPod Photo */ {
 337                 .firmware_revision      = 0x0a2700,
 338                 .model                  = 0x00007e,
 339                 .workarounds            = SBP2_WORKAROUND_FIX_CAPACITY,
 340         }
 341 };
 342
 343 static void
 344 free_orb(struct kref *kref)
 345 {
 346         struct sbp2_orb *orb = container_of(kref, struct sbp2_orb, kref);
 347
 348         kfree(orb);
 349 }
 350
 351 static void
 352 sbp2_status_write(struct fw_card *card, struct fw_request *request,
 353                   int tcode, int destination, int source,
 354                   int generation, int speed,
 355                   unsigned long long offset,
 356                   void *payload, size_t length, void *callback_data)
 357 {
 358         struct sbp2_logical_unit *lu = callback_data;
 359         struct sbp2_orb *orb;
 360         struct sbp2_status status;
 361         size_t header_size;
 362         unsigned long flags;
 363
 364         if (tcode != TCODE_WRITE_BLOCK_REQUEST ||
 365             length == 0 || length > sizeof(status)) {
 366                 fw_send_response(card, request, RCODE_TYPE_ERROR);
 367                 return;
 368         }
 369
 370         header_size = min(length, 2 * sizeof(u32));
 371         fw_memcpy_from_be32(&status, payload, header_size);
 372         if (length > header_size)
 373                 memcpy(status.data, payload + 8, length - header_size);
 374         if (STATUS_GET_SOURCE(status) == 2 || STATUS_GET_SOURCE(status) == 3) {
 375                 fw_notify("non-orb related status write, not handled\n");
 376                 fw_send_response(card, request, RCODE_COMPLETE);
 377                 return;
 378         }
 379
 380         /* Lookup the orb corresponding to this status write. */
 381         spin_lock_irqsave(&card->lock, flags);
 382         list_for_each_entry(orb, &lu->orb_list, link) {
 383                 if (STATUS_GET_ORB_HIGH(status) == 0 &&
 384                     STATUS_GET_ORB_LOW(status) == orb->request_bus) {
 385                         orb->rcode = RCODE_COMPLETE;
 386                         list_del(&orb->link);
 387                         break;
 388                 }
 389         }
 390         spin_unlock_irqrestore(&card->lock, flags);
 391
 392         if (&orb->link != &lu->orb_list)
 393                 orb->callback(orb, &status);
 394         else
 395                 fw_error("status write for unknown orb\n");
 396
 397         kref_put(&orb->kref, free_orb);
 398
 399         fw_send_response(card, request, RCODE_COMPLETE);
 400 }
 401
 402 static void
 403 complete_transaction(struct fw_card *card, int rcode,
 404                      void *payload, size_t length, void *data)
 405 {
 406         struct sbp2_orb *orb = data;
 407         unsigned long flags;
 408
 409         /*
 410          * This is a little tricky.  We can get the status write for
 411          * the orb before we get this callback.  The status write
 412          * handler above will assume the orb pointer transaction was
 413          * successful and set the rcode to RCODE_COMPLETE for the orb.
 414          * So this callback only sets the rcode if it hasn't already
 415          * been set and only does the cleanup if the transaction
 416          * failed and we didn't already get a status write.
 417          */
 418         spin_lock_irqsave(&card->lock, flags);
 419
 420         if (orb->rcode == -1)
 421                 orb->rcode = rcode;
 422         if (orb->rcode != RCODE_COMPLETE) {
 423                 list_del(&orb->link);
 424                 spin_unlock_irqrestore(&card->lock, flags);
 425                 orb->callback(orb, NULL);
 426         } else {
 427                 spin_unlock_irqrestore(&card->lock, flags);
 428         }
 429
 430         kref_put(&orb->kref, free_orb);
 431 }
 432
 433 static void
 434 sbp2_send_orb(struct sbp2_orb *orb, struct sbp2_logical_unit *lu,
 435               int node_id, int generation, u64 offset)
 436 {
 437         struct fw_device *device = fw_device(lu->tgt->unit->device.parent);
 438         unsigned long flags;
 439
 440         orb->pointer.high = 0;
 441         orb->pointer.low = orb->request_bus;
 442         fw_memcpy_to_be32(&orb->pointer, &orb->pointer, sizeof(orb->pointer));
 443
 444         spin_lock_irqsave(&device->card->lock, flags);
 445         list_add_tail(&orb->link, &lu->orb_list);
 446         spin_unlock_irqrestore(&device->card->lock, flags);
 447
 448         /* Take a ref for the orb list and for the transaction callback. */
 449         kref_get(&orb->kref);
 450         kref_get(&orb->kref);
 451
 452         fw_send_request(device->card, &orb->t, TCODE_WRITE_BLOCK_REQUEST,
 453                         node_id, generation, device->max_speed, offset,
 454                         &orb->pointer, sizeof(orb->pointer),
 455                         complete_transaction, orb);
 456 }
 457
 458 static int sbp2_cancel_orbs(struct sbp2_logical_unit *lu)
 459 {
 460         struct fw_device *device = fw_device(lu->tgt->unit->device.parent);
 461         struct sbp2_orb *orb, *next;
 462         struct list_head list;
 463         unsigned long flags;
 464         int retval = -ENOENT;
 465
 466         INIT_LIST_HEAD(&list);
 467         spin_lock_irqsave(&device->card->lock, flags);
 468         list_splice_init(&lu->orb_list, &list);
 469         spin_unlock_irqrestore(&device->card->lock, flags);
 470
 471         list_for_each_entry_safe(orb, next, &list, link) {
 472                 retval = 0;
 473                 if (fw_cancel_transaction(device->card, &orb->t) == 0)
 474                         continue;
 475
 476                 orb->rcode = RCODE_CANCELLED;
 477                 orb->callback(orb, NULL);
 478         }
 479
 480         return retval;
 481 }
 482
 483 static void
 484 complete_management_orb(struct sbp2_orb *base_orb, struct sbp2_status *status)
 485 {
 486         struct sbp2_management_orb *orb =
 487                 container_of(base_orb, struct sbp2_management_orb, base);
 488
 489         if (status)
 490                 memcpy(&orb->status, status, sizeof(*status));
 491         complete(&orb->done);
 492 }
 493
 494 static int
 495 sbp2_send_management_orb(struct sbp2_logical_unit *lu, int node_id,
 496                          int generation, int function, int lun_or_login_id,
 497                          void *response)
 498 {
 499         struct fw_device *device = fw_device(lu->tgt->unit->device.parent);
 500         struct sbp2_management_orb *orb;
 501         unsigned int timeout;
 502         int retval = -ENOMEM;
 503
 504         orb = kzalloc(sizeof(*orb), GFP_ATOMIC);
 505         if (orb == NULL)
 506                 return -ENOMEM;
 507
 508         kref_init(&orb->base.kref);
 509         orb->response_bus =
 510                 dma_map_single(device->card->device, &orb->response,
 511                                sizeof(orb->response), DMA_FROM_DEVICE);
 512         if (dma_mapping_error(orb->response_bus))
 513                 goto fail_mapping_response;
 514
 515         orb->request.response.high    = 0;
 516         orb->request.response.low     = orb->response_bus;
 517
 518         orb->request.misc =
 519                 MANAGEMENT_ORB_NOTIFY |
 520                 MANAGEMENT_ORB_FUNCTION(function) |
 521                 MANAGEMENT_ORB_LUN(lun_or_login_id);
 522         orb->request.length =
 523                 MANAGEMENT_ORB_RESPONSE_LENGTH(sizeof(orb->response));
 524
 525         orb->request.status_fifo.high = lu->address_handler.offset >> 32;
 526         orb->request.status_fifo.low  = lu->address_handler.offset;
 527
 528         if (function == SBP2_LOGIN_REQUEST) {
 529                 /* Ask for 2^2 == 4 seconds reconnect grace period */
 530                 orb->request.misc |=
 531                         MANAGEMENT_ORB_RECONNECT(2) |
 532                         MANAGEMENT_ORB_EXCLUSIVE(sbp2_param_exclusive_login);
 533                 timeout = lu->tgt->mgt_orb_timeout;
 534         } else {
 535                 timeout = SBP2_ORB_TIMEOUT;
 536         }
 537
 538         fw_memcpy_to_be32(&orb->request, &orb->request, sizeof(orb->request));
 539
 540         init_completion(&orb->done);
 541         orb->base.callback = complete_management_orb;
 542
 543         orb->base.request_bus =
 544                 dma_map_single(device->card->device, &orb->request,
 545                                sizeof(orb->request), DMA_TO_DEVICE);
 546         if (dma_mapping_error(orb->base.request_bus))
 547                 goto fail_mapping_request;
 548
 549         sbp2_send_orb(&orb->base, lu, node_id, generation,
 550                       lu->tgt->management_agent_address);
 551
 552         wait_for_completion_timeout(&orb->done, msecs_to_jiffies(timeout));
 553
 554         retval = -EIO;
 555         if (sbp2_cancel_orbs(lu) == 0) {
 556                 fw_error("orb reply timed out, rcode=0x%02x\n",
 557                          orb->base.rcode);
 558                 goto out;
 559         }
 560
 561         if (orb->base.rcode != RCODE_COMPLETE) {
 562                 fw_error("management write failed, rcode 0x%02x\n",
 563                          orb->base.rcode);
 564                 goto out;
 565         }
 566
 567         if (STATUS_GET_RESPONSE(orb->status) != 0 ||
 568             STATUS_GET_SBP_STATUS(orb->status) != 0) {
 569                 fw_error("error status: %d:%d\n",
 570                          STATUS_GET_RESPONSE(orb->status),
 571                          STATUS_GET_SBP_STATUS(orb->status));
 572                 goto out;
 573         }
 574
 575         retval = 0;
 576  out:
 577         dma_unmap_single(device->card->device, orb->base.request_bus,
 578                          sizeof(orb->request), DMA_TO_DEVICE);
 579  fail_mapping_request:
 580         dma_unmap_single(device->card->device, orb->response_bus,
 581                          sizeof(orb->response), DMA_FROM_DEVICE);
 582  fail_mapping_response:
 583         if (response)
 584                 fw_memcpy_from_be32(response,
 585                                     orb->response, sizeof(orb->response));
 586         kref_put(&orb->base.kref, free_orb);
 587
 588         return retval;
 589 }
 590
 591 static void
 592 complete_agent_reset_write(struct fw_card *card, int rcode,
 593                            void *payload, size_t length, void *data)
 594 {
 595         struct fw_transaction *t = data;
 596
 597         kfree(t);
 598 }
 599
 600 static int sbp2_agent_reset(struct sbp2_logical_unit *lu)
 601 {
 602         struct fw_device *device = fw_device(lu->tgt->unit->device.parent);
 603         struct fw_transaction *t;
 604         static u32 zero;
 605
 606         t = kzalloc(sizeof(*t), GFP_ATOMIC);
 607         if (t == NULL)
 608                 return -ENOMEM;
 609
 610         fw_send_request(device->card, t, TCODE_WRITE_QUADLET_REQUEST,
 611                         lu->tgt->node_id, lu->generation, device->max_speed,
 612                         lu->command_block_agent_address + SBP2_AGENT_RESET,
 613                         &zero, sizeof(zero), complete_agent_reset_write, t);
 614
 615         return 0;
 616 }
 617
 618 static void sbp2_release_target(struct kref *kref)
 619 {
 620         struct sbp2_target *tgt = container_of(kref, struct sbp2_target, kref);
 621         struct sbp2_logical_unit *lu, *next;
 622         struct Scsi_Host *shost =
 623                 container_of((void *)tgt, struct Scsi_Host, hostdata[0]);
 624         struct fw_device *device = fw_device(tgt->unit->device.parent);
 625
 626         list_for_each_entry_safe(lu, next, &tgt->lu_list, link) {
 627                 if (lu->sdev)
 628                         scsi_remove_device(lu->sdev);
 629
 630                 if (!fw_device_is_shutdown(device))
 631                         sbp2_send_management_orb(lu, tgt->node_id,
 632                                         lu->generation, SBP2_LOGOUT_REQUEST,
 633                                         lu->login_id, NULL);
 634
 635                 fw_core_remove_address_handler(&lu->address_handler);
 636                 list_del(&lu->link);
 637                 kfree(lu);
 638         }
 639         scsi_remove_host(shost);
 640         fw_notify("released %s\n", tgt->unit->device.bus_id);
 641
 642         put_device(&tgt->unit->device);
 643         scsi_host_put(shost);
 644 }
 645
 646 static struct workqueue_struct *sbp2_wq;
 647
 648 /*
 649  * Always get the target's kref when scheduling work on one its units.
 650  * Each workqueue job is responsible to call sbp2_target_put() upon return.
 651  */
 652 static void sbp2_queue_work(struct sbp2_logical_unit *lu, unsigned long delay)
 653 {
 654         if (queue_delayed_work(sbp2_wq, &lu->work, delay))
 655                 kref_get(&lu->tgt->kref);
 656 }
 657
 658 static void sbp2_target_put(struct sbp2_target *tgt)
 659 {
 660         kref_put(&tgt->kref, sbp2_release_target);
 661 }
 662
 663 static void sbp2_reconnect(struct work_struct *work);
 664
 665 static void sbp2_login(struct work_struct *work)
 666 {
 667         struct sbp2_logical_unit *lu =
 668                 container_of(work, struct sbp2_logical_unit, work.work);
 669         struct Scsi_Host *shost =
 670                 container_of((void *)lu->tgt, struct Scsi_Host, hostdata[0]);
 671         struct scsi_device *sdev;
 672         struct scsi_lun eight_bytes_lun;
 673         struct fw_unit *unit = lu->tgt->unit;
 674         struct fw_device *device = fw_device(unit->device.parent);
 675         struct sbp2_login_response response;
 676         int generation, node_id, local_node_id;
 677
 678         generation    = device->generation;
 679         smp_rmb();    /* node_id must not be older than generation */
 680         node_id       = device->node_id;
 681         local_node_id = device->card->node_id;
 682
 683         if (sbp2_send_management_orb(lu, node_id, generation,
 684                                 SBP2_LOGIN_REQUEST, lu->lun, &response) < 0) {
 685                 if (lu->retries++ < 5)
 686                         sbp2_queue_work(lu, DIV_ROUND_UP(HZ, 5));
 687                 else
 688                         fw_error("failed to login to %s LUN %04x\n",
 689                                  unit->device.bus_id, lu->lun);
 690                 goto out;
 691         }
 692
 693         lu->generation        = generation;
 694         lu->tgt->node_id      = node_id;
 695         lu->tgt->address_high = local_node_id << 16;
 696
 697         /* Get command block agent offset and login id. */
 698         lu->command_block_agent_address =
 699                 ((u64) (response.command_block_agent.high & 0xffff) << 32) |
 700                 response.command_block_agent.low;
 701         lu->login_id = LOGIN_RESPONSE_GET_LOGIN_ID(response);
 702
 703         fw_notify("logged in to %s LUN %04x (%d retries)\n",
 704                   unit->device.bus_id, lu->lun, lu->retries);
 705
 706 #if 0
 707         /* FIXME: The linux1394 sbp2 does this last step. */
 708         sbp2_set_busy_timeout(scsi_id);
 709 #endif
 710
 711         PREPARE_DELAYED_WORK(&lu->work, sbp2_reconnect);
 712         sbp2_agent_reset(lu);
 713
 714         memset(&eight_bytes_lun, 0, sizeof(eight_bytes_lun));
 715         eight_bytes_lun.scsi_lun[0] = (lu->lun >> 8) & 0xff;
 716         eight_bytes_lun.scsi_lun[1] = lu->lun & 0xff;
 717
 718         sdev = __scsi_add_device(shost, 0, 0,
 719                                  scsilun_to_int(&eight_bytes_lun), lu);
 720         if (IS_ERR(sdev)) {
 721                 sbp2_send_management_orb(lu, node_id, generation,
 722                                 SBP2_LOGOUT_REQUEST, lu->login_id, NULL);
 723                 /*
 724                  * Set this back to sbp2_login so we fall back and
 725                  * retry login on bus reset.
 726                  */
 727                 PREPARE_DELAYED_WORK(&lu->work, sbp2_login);
 728         } else {
 729                 lu->sdev = sdev;
 730                 scsi_device_put(sdev);
 731         }
 732  out:
 733         sbp2_target_put(lu->tgt);
 734 }
 735
 736 static int sbp2_add_logical_unit(struct sbp2_target *tgt, int lun_entry)
 737 {
 738         struct sbp2_logical_unit *lu;
 739
 740         lu = kmalloc(sizeof(*lu), GFP_KERNEL);
 741         if (!lu)
 742                 return -ENOMEM;
 743
 744         lu->address_handler.length           = 0x100;
 745         lu->address_handler.address_callback = sbp2_status_write;
 746         lu->address_handler.callback_data    = lu;
 747
 748         if (fw_core_add_address_handler(&lu->address_handler,
 749                                         &fw_high_memory_region) < 0) {
 750                 kfree(lu);
 751                 return -ENOMEM;
 752         }
 753
 754         lu->tgt  = tgt;
 755         lu->sdev = NULL;
 756         lu->lun  = lun_entry & 0xffff;
 757         lu->retries = 0;
 758         INIT_LIST_HEAD(&lu->orb_list);
 759         INIT_DELAYED_WORK(&lu->work, sbp2_login);
 760
 761         list_add_tail(&lu->link, &tgt->lu_list);
 762         return 0;
 763 }
 764
 765 static int sbp2_scan_logical_unit_dir(struct sbp2_target *tgt, u32 *directory)
 766 {
 767         struct fw_csr_iterator ci;
 768         int key, value;
 769
 770         fw_csr_iterator_init(&ci, directory);
 771         while (fw_csr_iterator_next(&ci, &key, &value))
 772                 if (key == SBP2_CSR_LOGICAL_UNIT_NUMBER &&
 773                     sbp2_add_logical_unit(tgt, value) < 0)
 774                         return -ENOMEM;
 775         return 0;
 776 }
 777
 778 static int sbp2_scan_unit_dir(struct sbp2_target *tgt, u32 *directory,
 779                               u32 *model, u32 *firmware_revision)
 780 {
 781         struct fw_csr_iterator ci;
 782         int key, value;
 783         unsigned int timeout;
 784
 785         fw_csr_iterator_init(&ci, directory);
 786         while (fw_csr_iterator_next(&ci, &key, &value)) {
 787                 switch (key) {
 788
 789                 case CSR_DEPENDENT_INFO | CSR_OFFSET:
 790                         tgt->management_agent_address =
 791                                         CSR_REGISTER_BASE + 4 * value;
 792                         break;
 793
 794                 case CSR_DIRECTORY_ID:
 795                         tgt->directory_id = value;
 796                         break;
 797
 798                 case CSR_MODEL:
 799                         *model = value;
 800                         break;
 801
 802                 case SBP2_CSR_FIRMWARE_REVISION:
 803                         *firmware_revision = value;
 804                         break;
 805
 806                 case SBP2_CSR_UNIT_CHARACTERISTICS:
 807                         /* the timeout value is stored in 500ms units */
 808                         timeout = ((unsigned int) value >> 8 & 0xff) * 500;
 809                         timeout = max(timeout, SBP2_MIN_LOGIN_ORB_TIMEOUT);
 810                         tgt->mgt_orb_timeout =
 811                                   min(timeout, SBP2_MAX_LOGIN_ORB_TIMEOUT);
 812
 813                         if (timeout > tgt->mgt_orb_timeout)
 814                                 fw_notify("%s: config rom contains %ds "
 815                                           "management ORB timeout, limiting "
 816                                           "to %ds\n", tgt->unit->device.bus_id,
 817                                           timeout / 1000,
 818                                           tgt->mgt_orb_timeout / 1000);
 819                         break;
 820
 821                 case SBP2_CSR_LOGICAL_UNIT_NUMBER:
 822                         if (sbp2_add_logical_unit(tgt, value) < 0)
 823                                 return -ENOMEM;
 824                         break;
 825
 826                 case SBP2_CSR_LOGICAL_UNIT_DIRECTORY:
 827                         if (sbp2_scan_logical_unit_dir(tgt, ci.p + value) < 0)
 828                                 return -ENOMEM;
 829                         break;
 830                 }
 831         }
 832         return 0;
 833 }
 834
 835 static void sbp2_init_workarounds(struct sbp2_target *tgt, u32 model,
 836                                   u32 firmware_revision)
 837 {
 838         int i;
 839         unsigned w = sbp2_param_workarounds;
 840
 841         if (w)
 842                 fw_notify("Please notify linux1394-devel@lists.sourceforge.net "
 843                           "if you need the workarounds parameter for %s\n",
 844                           tgt->unit->device.bus_id);
 845
 846         if (w & SBP2_WORKAROUND_OVERRIDE)
 847                 goto out;
 848
 849         for (i = 0; i < ARRAY_SIZE(sbp2_workarounds_table); i++) {
 850
 851                 if (sbp2_workarounds_table[i].firmware_revision !=
 852                     (firmware_revision & 0xffffff00))
 853                         continue;
 854
 855                 if (sbp2_workarounds_table[i].model != model &&
 856                     sbp2_workarounds_table[i].model != ~0)
 857                         continue;
 858
 859                 w |= sbp2_workarounds_table[i].workarounds;
 860                 break;
 861         }
 862  out:
 863         if (w)
 864                 fw_notify("Workarounds for %s: 0x%x "
 865                           "(firmware_revision 0x%06x, model_id 0x%06x)\n",
 866                           tgt->unit->device.bus_id,
 867                           w, firmware_revision, model);
 868         tgt->workarounds = w;
 869 }
 870
 871 static struct scsi_host_template scsi_driver_template;
 872
 873 static int sbp2_probe(struct device *dev)
 874 {
 875         struct fw_unit *unit = fw_unit(dev);
 876         struct fw_device *device = fw_device(unit->device.parent);
 877         struct sbp2_target *tgt;
 878         struct sbp2_logical_unit *lu;
 879         struct Scsi_Host *shost;
 880         u32 model, firmware_revision;
 881
 882         shost = scsi_host_alloc(&scsi_driver_template, sizeof(*tgt));
 883         if (shost == NULL)
 884                 return -ENOMEM;
 885
 886         tgt = (struct sbp2_target *)shost->hostdata;
 887         unit->device.driver_data = tgt;
 888         tgt->unit = unit;
 889         kref_init(&tgt->kref);
 890         INIT_LIST_HEAD(&tgt->lu_list);
 891
 892         if (fw_device_enable_phys_dma(device) < 0)
 893                 goto fail_shost_put;
 894
 895         if (scsi_add_host(shost, &unit->device) < 0)
 896                 goto fail_shost_put;
 897
 898         /* Initialize to values that won't match anything in our table. */
 899         firmware_revision = 0xff000000;
 900         model = 0xff000000;
 901
 902         /* implicit directory ID */
 903         tgt->directory_id = ((unit->directory - device->config_rom) * 4
 904                              + CSR_CONFIG_ROM) & 0xffffff;
 905
 906         if (sbp2_scan_unit_dir(tgt, unit->directory, &model,
 907                                &firmware_revision) < 0)
 908                 goto fail_tgt_put;
 909
 910         sbp2_init_workarounds(tgt, model, firmware_revision);
 911
 912         get_device(&unit->device);
 913
 914         /* Do the login in a workqueue so we can easily reschedule retries. */
 915         list_for_each_entry(lu, &tgt->lu_list, link)
 916                 sbp2_queue_work(lu, 0);
 917         return 0;
 918
 919  fail_tgt_put:
 920         sbp2_target_put(tgt);
 921         return -ENOMEM;
 922
 923  fail_shost_put:
 924         scsi_host_put(shost);
 925         return -ENOMEM;
 926 }
 927
 928 static int sbp2_remove(struct device *dev)
 929 {
 930         struct fw_unit *unit = fw_unit(dev);
 931         struct sbp2_target *tgt = unit->device.driver_data;
 932
 933         sbp2_target_put(tgt);
 934         return 0;
 935 }
 936
 937 static void sbp2_reconnect(struct work_struct *work)
 938 {
 939         struct sbp2_logical_unit *lu =
 940                 container_of(work, struct sbp2_logical_unit, work.work);
 941         struct fw_unit *unit = lu->tgt->unit;
 942         struct fw_device *device = fw_device(unit->device.parent);
 943         int generation, node_id, local_node_id;
 944
 945         generation    = device->generation;
 946         smp_rmb();    /* node_id must not be older than generation */
 947         node_id       = device->node_id;
 948         local_node_id = device->card->node_id;
 949
 950         if (sbp2_send_management_orb(lu, node_id, generation,
 951                                      SBP2_RECONNECT_REQUEST,
 952                                      lu->login_id, NULL) < 0) {
 953                 if (lu->retries++ >= 5) {
 954                         fw_error("failed to reconnect to %s\n",
 955                                  unit->device.bus_id);
 956                         /* Fall back and try to log in again. */
 957                         lu->retries = 0;
 958                         PREPARE_DELAYED_WORK(&lu->work, sbp2_login);
 959                 }
 960                 sbp2_queue_work(lu, DIV_ROUND_UP(HZ, 5));
 961                 goto out;
 962         }
 963
 964         lu->generation        = generation;
 965         lu->tgt->node_id      = node_id;
 966         lu->tgt->address_high = local_node_id << 16;
 967
 968         fw_notify("reconnected to %s LUN %04x (%d retries)\n",
 969                   unit->device.bus_id, lu->lun, lu->retries);
 970
 971         sbp2_agent_reset(lu);
 972         sbp2_cancel_orbs(lu);
 973  out:
 974         sbp2_target_put(lu->tgt);
 975 }
 976
 977 static void sbp2_update(struct fw_unit *unit)
 978 {
 979         struct sbp2_target *tgt = unit->device.driver_data;
 980         struct sbp2_logical_unit *lu;
 981
 982         fw_device_enable_phys_dma(fw_device(unit->device.parent));
 983
 984         /*
 985          * Fw-core serializes sbp2_update() against sbp2_remove().
 986          * Iteration over tgt->lu_list is therefore safe here.
 987          */
 988         list_for_each_entry(lu, &tgt->lu_list, link) {
 989                 lu->retries = 0;
 990                 sbp2_queue_work(lu, 0);
 991         }
 992 }
 993
 994 #define SBP2_UNIT_SPEC_ID_ENTRY 0x0000609e
 995 #define SBP2_SW_VERSION_ENTRY   0x00010483
 996
 997 static const struct fw_device_id sbp2_id_table[] = {
 998         {
 999                 .match_flags  = FW_MATCH_SPECIFIER_ID | FW_MATCH_VERSION,
1000                 .specifier_id = SBP2_UNIT_SPEC_ID_ENTRY,
1001                 .version      = SBP2_SW_VERSION_ENTRY,
1002         },
1003         { }
1004 };
1005
1006 static struct fw_driver sbp2_driver = {
1007         .driver   = {
1008                 .owner  = THIS_MODULE,
1009                 .name   = sbp2_driver_name,
1010                 .bus    = &fw_bus_type,
1011                 .probe  = sbp2_probe,
1012                 .remove = sbp2_remove,
1013         },
1014         .update   = sbp2_update,
1015         .id_table = sbp2_id_table,
1016 };
1017
1018 static unsigned int
1019 sbp2_status_to_sense_data(u8 *sbp2_status, u8 *sense_data)
1020 {
1021         int sam_status;
1022
1023         sense_data[0] = 0x70;
1024         sense_data[1] = 0x0;
1025         sense_data[2] = sbp2_status[1];
1026         sense_data[3] = sbp2_status[4];
1027         sense_data[4] = sbp2_status[5];
1028         sense_data[5] = sbp2_status[6];
1029         sense_data[6] = sbp2_status[7];
1030         sense_data[7] = 10;
1031         sense_data[8] = sbp2_status[8];
1032         sense_data[9] = sbp2_status[9];
1033         sense_data[10] = sbp2_status[10];
1034         sense_data[11] = sbp2_status[11];
1035         sense_data[12] = sbp2_status[2];
1036         sense_data[13] = sbp2_status[3];
1037         sense_data[14] = sbp2_status[12];
1038         sense_data[15] = sbp2_status[13];
1039
1040         sam_status = sbp2_status[0] & 0x3f;
1041
1042         switch (sam_status) {
1043         case SAM_STAT_GOOD:
1044         case SAM_STAT_CHECK_CONDITION:
1045         case SAM_STAT_CONDITION_MET:
1046         case SAM_STAT_BUSY:
1047         case SAM_STAT_RESERVATION_CONFLICT:
1048         case SAM_STAT_COMMAND_TERMINATED:
1049                 return DID_OK << 16 | sam_status;
1050
1051         default:
1052                 return DID_ERROR << 16;
1053         }
1054 }
1055
1056 static void
1057 complete_command_orb(struct sbp2_orb *base_orb, struct sbp2_status *status)
1058 {
1059         struct sbp2_command_orb *orb =
1060                 container_of(base_orb, struct sbp2_command_orb, base);
1061         struct fw_device *device = fw_device(orb->lu->tgt->unit->device.parent);
1062         int result;
1063
1064         if (status != NULL) {
1065                 if (STATUS_GET_DEAD(*status))
1066                         sbp2_agent_reset(orb->lu);
1067
1068                 switch (STATUS_GET_RESPONSE(*status)) {
1069                 case SBP2_STATUS_REQUEST_COMPLETE:
1070                         result = DID_OK << 16;
1071                         break;
1072                 case SBP2_STATUS_TRANSPORT_FAILURE:
1073                         result = DID_BUS_BUSY << 16;
1074                         break;
1075                 case SBP2_STATUS_ILLEGAL_REQUEST:
1076                 case SBP2_STATUS_VENDOR_DEPENDENT:
1077                 default:
1078                         result = DID_ERROR << 16;
1079                         break;
1080                 }
1081
1082                 if (result == DID_OK << 16 && STATUS_GET_LEN(*status) > 1)
1083                         result = sbp2_status_to_sense_data(STATUS_GET_DATA(*status),
1084                                                            orb->cmd->sense_buffer);
1085         } else {
1086                 /*
1087                  * If the orb completes with status == NULL, something
1088                  * went wrong, typically a bus reset happened mid-orb
1089                  * or when sending the write (less likely).
1090                  */
1091                 result = DID_BUS_BUSY << 16;
1092         }
1093
1094         dma_unmap_single(device->card->device, orb->base.request_bus,
1095                          sizeof(orb->request), DMA_TO_DEVICE);
1096
1097         if (scsi_sg_count(orb->cmd) > 0)
1098                 dma_unmap_sg(device->card->device, scsi_sglist(orb->cmd),
1099                              scsi_sg_count(orb->cmd),
1100                              orb->cmd->sc_data_direction);
1101
1102         if (orb->page_table_bus != 0)
1103                 dma_unmap_single(device->card->device, orb->page_table_bus,
1104                                  sizeof(orb->page_table), DMA_TO_DEVICE);
1105
1106         orb->cmd->result = result;
1107         orb->done(orb->cmd);
1108 }
1109
1110 static int
1111 sbp2_map_scatterlist(struct sbp2_command_orb *orb, struct fw_device *device,
1112                      struct sbp2_logical_unit *lu)
1113 {
1114         struct scatterlist *sg;
1115         int sg_len, l, i, j, count;
1116         dma_addr_t sg_addr;
1117
1118         sg = scsi_sglist(orb->cmd);
1119         count = dma_map_sg(device->card->device, sg, scsi_sg_count(orb->cmd),
1120                            orb->cmd->sc_data_direction);
1121         if (count == 0)
1122                 goto fail;
1123
1124         /*
1125          * Handle the special case where there is only one element in
1126          * the scatter list by converting it to an immediate block
1127          * request. This is also a workaround for broken devices such
1128          * as the second generation iPod which doesn't support page
1129          * tables.
1130          */
1131         if (count == 1 && sg_dma_len(sg) < SBP2_MAX_SG_ELEMENT_LENGTH) {
1132                 orb->request.data_descriptor.high = lu->tgt->address_high;
1133                 orb->request.data_descriptor.low  = sg_dma_address(sg);
1134                 orb->request.misc |= COMMAND_ORB_DATA_SIZE(sg_dma_len(sg));
1135                 return 0;
1136         }
1137
1138         /*
1139          * Convert the scatterlist to an sbp2 page table.  If any
1140          * scatterlist entries are too big for sbp2, we split them as we
1141          * go.  Even if we ask the block I/O layer to not give us sg
1142          * elements larger than 65535 bytes, some IOMMUs may merge sg elements
1143          * during DMA mapping, and Linux currently doesn't prevent this.
1144          */
1145         for (i = 0, j = 0; i < count; i++, sg = sg_next(sg)) {
1146                 sg_len = sg_dma_len(sg);
1147                 sg_addr = sg_dma_address(sg);
1148                 while (sg_len) {
1149                         /* FIXME: This won't get us out of the pinch. */
1150                         if (unlikely(j >= ARRAY_SIZE(orb->page_table))) {
1151                                 fw_error("page table overflow\n");
1152                                 goto fail_page_table;
1153                         }
1154                         l = min(sg_len, SBP2_MAX_SG_ELEMENT_LENGTH);
1155                         orb->page_table[j].low = sg_addr;
1156                         orb->page_table[j].high = (l << 16);
1157                         sg_addr += l;
1158                         sg_len -= l;
1159                         j++;
1160                 }
1161         }
1162
1163         fw_memcpy_to_be32(orb->page_table, orb->page_table,
1164                           sizeof(orb->page_table[0]) * j);
1165         orb->page_table_bus =
1166                 dma_map_single(device->card->device, orb->page_table,
1167                                sizeof(orb->page_table), DMA_TO_DEVICE);
1168         if (dma_mapping_error(orb->page_table_bus))
1169                 goto fail_page_table;
1170
1171         /*
1172          * The data_descriptor pointer is the one case where we need
1173          * to fill in the node ID part of the address.  All other
1174          * pointers assume that the data referenced reside on the
1175          * initiator (i.e. us), but data_descriptor can refer to data
1176          * on other nodes so we need to put our ID in descriptor.high.
1177          */
1178         orb->request.data_descriptor.high = lu->tgt->address_high;
1179         orb->request.data_descriptor.low  = orb->page_table_bus;
1180         orb->request.misc |=
1181                 COMMAND_ORB_PAGE_TABLE_PRESENT |
1182                 COMMAND_ORB_DATA_SIZE(j);
1183
1184         return 0;
1185
1186  fail_page_table:
1187         dma_unmap_sg(device->card->device, sg, scsi_sg_count(orb->cmd),
1188                      orb->cmd->sc_data_direction);
1189  fail:
1190         return -ENOMEM;
1191 }
1192
1193 /* SCSI stack integration */
1194
1195 static int sbp2_scsi_queuecommand(struct scsi_cmnd *cmd, scsi_done_fn_t done)
1196 {
1197         struct sbp2_logical_unit *lu = cmd->device->hostdata;
1198         struct fw_device *device = fw_device(lu->tgt->unit->device.parent);
1199         struct sbp2_command_orb *orb;
1200         unsigned max_payload;
1201         int retval = SCSI_MLQUEUE_HOST_BUSY;
1202
1203         /*
1204          * Bidirectional commands are not yet implemented, and unknown
1205          * transfer direction not handled.
1206          */
1207         if (cmd->sc_data_direction == DMA_BIDIRECTIONAL) {
1208                 fw_error("Can't handle DMA_BIDIRECTIONAL, rejecting command\n");
1209                 cmd->result = DID_ERROR << 16;
1210                 done(cmd);
1211                 return 0;
1212         }
1213
1214         orb = kzalloc(sizeof(*orb), GFP_ATOMIC);
1215         if (orb == NULL) {
1216                 fw_notify("failed to alloc orb\n");
1217                 return SCSI_MLQUEUE_HOST_BUSY;
1218         }
1219
1220         /* Initialize rcode to something not RCODE_COMPLETE. */
1221         orb->base.rcode = -1;
1222         kref_init(&orb->base.kref);
1223
1224         orb->lu   = lu;
1225         orb->done = done;
1226         orb->cmd  = cmd;
1227
1228         orb->request.next.high   = SBP2_ORB_NULL;
1229         orb->request.next.low    = 0x0;
1230         /*
1231          * At speed 100 we can do 512 bytes per packet, at speed 200,
1232          * 1024 bytes per packet etc.  The SBP-2 max_payload field
1233          * specifies the max payload size as 2 ^ (max_payload + 2), so
1234          * if we set this to max_speed + 7, we get the right value.
1235          */
1236         max_payload = min(device->max_speed + 7,
1237                           device->card->max_receive - 1);
1238         orb->request.misc =
1239                 COMMAND_ORB_MAX_PAYLOAD(max_payload) |
1240                 COMMAND_ORB_SPEED(device->max_speed) |
1241                 COMMAND_ORB_NOTIFY;
1242
1243         if (cmd->sc_data_direction == DMA_FROM_DEVICE)
1244                 orb->request.misc |=
1245                         COMMAND_ORB_DIRECTION(SBP2_DIRECTION_FROM_MEDIA);
1246         else if (cmd->sc_data_direction == DMA_TO_DEVICE)
1247                 orb->request.misc |=
1248                         COMMAND_ORB_DIRECTION(SBP2_DIRECTION_TO_MEDIA);
1249
1250         if (scsi_sg_count(cmd) && sbp2_map_scatterlist(orb, device, lu) < 0)
1251                 goto out;
1252
1253         fw_memcpy_to_be32(&orb->request, &orb->request, sizeof(orb->request));
1254
1255         memset(orb->request.command_block,
1256                0, sizeof(orb->request.command_block));
1257         memcpy(orb->request.command_block, cmd->cmnd, COMMAND_SIZE(*cmd->cmnd));
1258
1259         orb->base.callback = complete_command_orb;
1260         orb->base.request_bus =
1261                 dma_map_single(device->card->device, &orb->request,
1262                                sizeof(orb->request), DMA_TO_DEVICE);
1263         if (dma_mapping_error(orb->base.request_bus))
1264                 goto out;
1265
1266         sbp2_send_orb(&orb->base, lu, lu->tgt->node_id, lu->generation,
1267                       lu->command_block_agent_address + SBP2_ORB_POINTER);
1268         retval = 0;
1269  out:
1270         kref_put(&orb->base.kref, free_orb);
1271         return retval;
1272 }
1273
1274 static int sbp2_scsi_slave_alloc(struct scsi_device *sdev)
1275 {
1276         struct sbp2_logical_unit *lu = sdev->hostdata;
1277
1278         sdev->allow_restart = 1;
1279
1280         /*
1281          * Update the dma alignment (minimum alignment requirements for
1282          * start and end of DMA transfers) to be a sector
1283          */
1284         blk_queue_update_dma_alignment(sdev->request_queue, 511);
1285
1286         if (lu->tgt->workarounds & SBP2_WORKAROUND_INQUIRY_36)
1287                 sdev->inquiry_len = 36;
1288
1289         return 0;
1290 }
1291
1292 static int sbp2_scsi_slave_configure(struct scsi_device *sdev)
1293 {
1294         struct sbp2_logical_unit *lu = sdev->hostdata;
1295
1296         sdev->use_10_for_rw = 1;
1297
1298         if (sdev->type == TYPE_ROM)
1299                 sdev->use_10_for_ms = 1;
1300
1301         if (sdev->type == TYPE_DISK &&
1302             lu->tgt->workarounds & SBP2_WORKAROUND_MODE_SENSE_8)
1303                 sdev->skip_ms_page_8 = 1;
1304
1305         if (lu->tgt->workarounds & SBP2_WORKAROUND_FIX_CAPACITY)
1306                 sdev->fix_capacity = 1;
1307
1308         if (lu->tgt->workarounds & SBP2_WORKAROUND_128K_MAX_TRANS)
1309                 blk_queue_max_sectors(sdev->request_queue, 128 * 1024 / 512);
1310
1311         return 0;
1312 }
1313
1314 /*
1315  * Called by scsi stack when something has really gone wrong.  Usually
1316  * called when a command has timed-out for some reason.
1317  */
1318 static int sbp2_scsi_abort(struct scsi_cmnd *cmd)
1319 {
1320         struct sbp2_logical_unit *lu = cmd->device->hostdata;
1321
1322         fw_notify("sbp2_scsi_abort\n");
1323         sbp2_agent_reset(lu);
1324         sbp2_cancel_orbs(lu);
1325
1326         return SUCCESS;
1327 }
1328
1329 /*
1330  * Format of /sys/bus/scsi/devices/.../ieee1394_id:
1331  * u64 EUI-64 : u24 directory_ID : u16 LUN  (all printed in hexadecimal)
1332  *
1333  * This is the concatenation of target port identifier and logical unit
1334  * identifier as per SAM-2...SAM-4 annex A.
1335  */
1336 static ssize_t
1337 sbp2_sysfs_ieee1394_id_show(struct device *dev, struct device_attribute *attr,
1338                             char *buf)
1339 {
1340         struct scsi_device *sdev = to_scsi_device(dev);
1341         struct sbp2_logical_unit *lu;
1342         struct fw_device *device;
1343
1344         if (!sdev)
1345                 return 0;
1346
1347         lu = sdev->hostdata;
1348         device = fw_device(lu->tgt->unit->device.parent);
1349
1350         return sprintf(buf, "%08x%08x:%06x:%04x\n",
1351                         device->config_rom[3], device->config_rom[4],
1352                         lu->tgt->directory_id, lu->lun);
1353 }
1354
1355 static DEVICE_ATTR(ieee1394_id, S_IRUGO, sbp2_sysfs_ieee1394_id_show, NULL);
1356
1357 static struct device_attribute *sbp2_scsi_sysfs_attrs[] = {
1358         &dev_attr_ieee1394_id,
1359         NULL
1360 };
1361
1362 static struct scsi_host_template scsi_driver_template = {
1363         .module                 = THIS_MODULE,
1364         .name                   = "SBP-2 IEEE-1394",
1365         .proc_name              = sbp2_driver_name,
1366         .queuecommand           = sbp2_scsi_queuecommand,
1367         .slave_alloc            = sbp2_scsi_slave_alloc,
1368         .slave_configure        = sbp2_scsi_slave_configure,
1369         .eh_abort_handler       = sbp2_scsi_abort,
1370         .this_id                = -1,
1371         .sg_tablesize           = SG_ALL,
1372         .use_clustering         = ENABLE_CLUSTERING,
1373         .cmd_per_lun            = 1,
1374         .can_queue              = 1,
1375         .sdev_attrs             = sbp2_scsi_sysfs_attrs,
1376 };
1377
1378 MODULE_AUTHOR("Kristian Hoegsberg <krh@bitplanet.net>");
1379 MODULE_DESCRIPTION("SCSI over IEEE1394");
1380 MODULE_LICENSE("GPL");
1381 MODULE_DEVICE_TABLE(ieee1394, sbp2_id_table);
1382
1383 /* Provide a module alias so root-on-sbp2 initrds don't break. */
1384 #ifndef CONFIG_IEEE1394_SBP2_MODULE
1385 MODULE_ALIAS("sbp2");
1386 #endif
1387
1388 static int __init sbp2_init(void)
1389 {
1390         sbp2_wq = create_singlethread_workqueue(KBUILD_MODNAME);
1391         if (!sbp2_wq)
1392                 return -ENOMEM;
1393
1394         return driver_register(&sbp2_driver.driver);
1395 }
1396
1397 static void __exit sbp2_cleanup(void)
1398 {
1399         driver_unregister(&sbp2_driver.driver);
1400         destroy_workqueue(sbp2_wq);
1401 }
1402
1403 module_init(sbp2_init);
1404 module_exit(sbp2_cleanup);