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
  44 #include <scsi/scsi.h>
  45 #include <scsi/scsi_cmnd.h>
  46 #include <scsi/scsi_device.h>
  47 #include <scsi/scsi_host.h>
  48
  49 #include "fw-transaction.h"
  50 #include "fw-topology.h"
  51 #include "fw-device.h"
  52
  53 /*
  54  * So far only bridges from Oxford Semiconductor are known to support
  55  * concurrent logins. Depending on firmware, four or two concurrent logins
  56  * are possible on OXFW911 and newer Oxsemi bridges.
  57  *
  58  * Concurrent logins are useful together with cluster filesystems.
  59  */
  60 static int sbp2_param_exclusive_login = 1;
  61 module_param_named(exclusive_login, sbp2_param_exclusive_login, bool, 0644);
  62 MODULE_PARM_DESC(exclusive_login, "Exclusive login to sbp2 device "
  63                  "(default = Y, use N for concurrent initiators)");
  64
  65 /*
  66  * Flags for firmware oddities
  67  *
  68  * - 128kB max transfer
  69  *   Limit transfer size. Necessary for some old bridges.
  70  *
  71  * - 36 byte inquiry
  72  *   When scsi_mod probes the device, let the inquiry command look like that
  73  *   from MS Windows.
  74  *
  75  * - skip mode page 8
  76  *   Suppress sending of mode_sense for mode page 8 if the device pretends to
  77  *   support the SCSI Primary Block commands instead of Reduced Block Commands.
  78  *
  79  * - fix capacity
  80  *   Tell sd_mod to correct the last sector number reported by read_capacity.
  81  *   Avoids access beyond actual disk limits on devices with an off-by-one bug.
  82  *   Don't use this with devices which don't have this bug.
  83  *
  84  * - override internal blacklist
  85  *   Instead of adding to the built-in blacklist, use only the workarounds
  86  *   specified in the module load parameter.
  87  *   Useful if a blacklist entry interfered with a non-broken device.
  88  */
  89 #define SBP2_WORKAROUND_128K_MAX_TRANS  0x1
  90 #define SBP2_WORKAROUND_INQUIRY_36      0x2
  91 #define SBP2_WORKAROUND_MODE_SENSE_8    0x4
  92 #define SBP2_WORKAROUND_FIX_CAPACITY    0x8
  93 #define SBP2_WORKAROUND_OVERRIDE        0x100
  94
  95 static int sbp2_param_workarounds;
  96 module_param_named(workarounds, sbp2_param_workarounds, int, 0644);
  97 MODULE_PARM_DESC(workarounds, "Work around device bugs (default = 0"
  98         ", 128kB max transfer = " __stringify(SBP2_WORKAROUND_128K_MAX_TRANS)
  99         ", 36 byte inquiry = "    __stringify(SBP2_WORKAROUND_INQUIRY_36)
 100         ", skip mode page 8 = "   __stringify(SBP2_WORKAROUND_MODE_SENSE_8)
 101         ", fix capacity = "       __stringify(SBP2_WORKAROUND_FIX_CAPACITY)
 102         ", override internal blacklist = " __stringify(SBP2_WORKAROUND_OVERRIDE)
 103         ", or a combination)");
 104
 105 /* I don't know why the SCSI stack doesn't define something like this... */
 106 typedef void (*scsi_done_fn_t)(struct scsi_cmnd *);
 107
 108 static const char sbp2_driver_name[] = "sbp2";
 109
 110 /*
 111  * We create one struct sbp2_logical_unit per SBP-2 Logical Unit Number Entry
 112  * and one struct scsi_device per sbp2_logical_unit.
 113  */
 114 struct sbp2_logical_unit {
 115         struct sbp2_target *tgt;
 116         struct list_head link;
 117         struct scsi_device *sdev;
 118         struct fw_address_handler address_handler;
 119         struct list_head orb_list;
 120
 121         u64 command_block_agent_address;
 122         u16 lun;
 123         int login_id;
 124
 125         /*
 126          * The generation is updated once we've logged in or reconnected
 127          * to the logical unit.  Thus, I/O to the device will automatically
 128          * fail and get retried if it happens in a window where the device
 129          * is not ready, e.g. after a bus reset but before we reconnect.
 130          */
 131         int generation;
 132         int retries;
 133         struct delayed_work work;
 134 };
 135
 136 /*
 137  * We create one struct sbp2_target per IEEE 1212 Unit Directory
 138  * and one struct Scsi_Host per sbp2_target.
 139  */
 140 struct sbp2_target {
 141         struct kref kref;
 142         struct fw_unit *unit;
 143
 144         u64 management_agent_address;
 145         int directory_id;
 146         int node_id;
 147         int address_high;
 148
 149         unsigned workarounds;
 150         struct list_head lu_list;
 151 };
 152
 153 #define SBP2_MAX_SG_ELEMENT_LENGTH      0xf000
 154 #define SBP2_MAX_SECTORS                255     /* Max sectors supported */
 155 #define SBP2_ORB_TIMEOUT                2000    /* Timeout in ms */
 156
 157 #define SBP2_ORB_NULL                   0x80000000
 158
 159 #define SBP2_DIRECTION_TO_MEDIA         0x0
 160 #define SBP2_DIRECTION_FROM_MEDIA       0x1
 161
 162 /* Unit directory keys */
 163 #define SBP2_CSR_FIRMWARE_REVISION      0x3c
 164 #define SBP2_CSR_LOGICAL_UNIT_NUMBER    0x14
 165 #define SBP2_CSR_LOGICAL_UNIT_DIRECTORY 0xd4
 166
 167 /* Management orb opcodes */
 168 #define SBP2_LOGIN_REQUEST              0x0
 169 #define SBP2_QUERY_LOGINS_REQUEST       0x1
 170 #define SBP2_RECONNECT_REQUEST          0x3
 171 #define SBP2_SET_PASSWORD_REQUEST       0x4
 172 #define SBP2_LOGOUT_REQUEST             0x7
 173 #define SBP2_ABORT_TASK_REQUEST         0xb
 174 #define SBP2_ABORT_TASK_SET             0xc
 175 #define SBP2_LOGICAL_UNIT_RESET         0xe
 176 #define SBP2_TARGET_RESET_REQUEST       0xf
 177
 178 /* Offsets for command block agent registers */
 179 #define SBP2_AGENT_STATE                0x00
 180 #define SBP2_AGENT_RESET                0x04
 181 #define SBP2_ORB_POINTER                0x08
 182 #define SBP2_DOORBELL                   0x10
 183 #define SBP2_UNSOLICITED_STATUS_ENABLE  0x14
 184
 185 /* Status write response codes */
 186 #define SBP2_STATUS_REQUEST_COMPLETE    0x0
 187 #define SBP2_STATUS_TRANSPORT_FAILURE   0x1
 188 #define SBP2_STATUS_ILLEGAL_REQUEST     0x2
 189 #define SBP2_STATUS_VENDOR_DEPENDENT    0x3
 190
 191 #define STATUS_GET_ORB_HIGH(v)          ((v).status & 0xffff)
 192 #define STATUS_GET_SBP_STATUS(v)        (((v).status >> 16) & 0xff)
 193 #define STATUS_GET_LEN(v)               (((v).status >> 24) & 0x07)
 194 #define STATUS_GET_DEAD(v)              (((v).status >> 27) & 0x01)
 195 #define STATUS_GET_RESPONSE(v)          (((v).status >> 28) & 0x03)
 196 #define STATUS_GET_SOURCE(v)            (((v).status >> 30) & 0x03)
 197 #define STATUS_GET_ORB_LOW(v)           ((v).orb_low)
 198 #define STATUS_GET_DATA(v)              ((v).data)
 199
 200 struct sbp2_status {
 201         u32 status;
 202         u32 orb_low;
 203         u8 data[24];
 204 };
 205
 206 struct sbp2_pointer {
 207         u32 high;
 208         u32 low;
 209 };
 210
 211 struct sbp2_orb {
 212         struct fw_transaction t;
 213         struct kref kref;
 214         dma_addr_t request_bus;
 215         int rcode;
 216         struct sbp2_pointer pointer;
 217         void (*callback)(struct sbp2_orb * orb, struct sbp2_status * status);
 218         struct list_head link;
 219 };
 220
 221 #define MANAGEMENT_ORB_LUN(v)                   ((v))
 222 #define MANAGEMENT_ORB_FUNCTION(v)              ((v) << 16)
 223 #define MANAGEMENT_ORB_RECONNECT(v)             ((v) << 20)
 224 #define MANAGEMENT_ORB_EXCLUSIVE(v)             ((v) ? 1 << 28 : 0)
 225 #define MANAGEMENT_ORB_REQUEST_FORMAT(v)        ((v) << 29)
 226 #define MANAGEMENT_ORB_NOTIFY                   ((1) << 31)
 227
 228 #define MANAGEMENT_ORB_RESPONSE_LENGTH(v)       ((v))
 229 #define MANAGEMENT_ORB_PASSWORD_LENGTH(v)       ((v) << 16)
 230
 231 struct sbp2_management_orb {
 232         struct sbp2_orb base;
 233         struct {
 234                 struct sbp2_pointer password;
 235                 struct sbp2_pointer response;
 236                 u32 misc;
 237                 u32 length;
 238                 struct sbp2_pointer status_fifo;
 239         } request;
 240         __be32 response[4];
 241         dma_addr_t response_bus;
 242         struct completion done;
 243         struct sbp2_status status;
 244 };
 245
 246 #define LOGIN_RESPONSE_GET_LOGIN_ID(v)  ((v).misc & 0xffff)
 247 #define LOGIN_RESPONSE_GET_LENGTH(v)    (((v).misc >> 16) & 0xffff)
 248
 249 struct sbp2_login_response {
 250         u32 misc;
 251         struct sbp2_pointer command_block_agent;
 252         u32 reconnect_hold;
 253 };
 254 #define COMMAND_ORB_DATA_SIZE(v)        ((v))
 255 #define COMMAND_ORB_PAGE_SIZE(v)        ((v) << 16)
 256 #define COMMAND_ORB_PAGE_TABLE_PRESENT  ((1) << 19)
 257 #define COMMAND_ORB_MAX_PAYLOAD(v)      ((v) << 20)
 258 #define COMMAND_ORB_SPEED(v)            ((v) << 24)
 259 #define COMMAND_ORB_DIRECTION(v)        ((v) << 27)
 260 #define COMMAND_ORB_REQUEST_FORMAT(v)   ((v) << 29)
 261 #define COMMAND_ORB_NOTIFY              ((1) << 31)
 262
 263 struct sbp2_command_orb {
 264         struct sbp2_orb base;
 265         struct {
 266                 struct sbp2_pointer next;
 267                 struct sbp2_pointer data_descriptor;
 268                 u32 misc;
 269                 u8 command_block[12];
 270         } request;
 271         struct scsi_cmnd *cmd;
 272         scsi_done_fn_t done;
 273         struct sbp2_logical_unit *lu;
 274
 275         struct sbp2_pointer page_table[SG_ALL] __attribute__((aligned(8)));
 276         dma_addr_t page_table_bus;
 277 };
 278
 279 /*
 280  * List of devices with known bugs.
 281  *
 282  * The firmware_revision field, masked with 0xffff00, is the best
 283  * indicator for the type of bridge chip of a device.  It yields a few
 284  * false positives but this did not break correctly behaving devices
 285  * so far.  We use ~0 as a wildcard, since the 24 bit values we get
 286  * from the config rom can never match that.
 287  */
 288 static const struct {
 289         u32 firmware_revision;
 290         u32 model;
 291         unsigned workarounds;
 292 } sbp2_workarounds_table[] = {
 293         /* DViCO Momobay CX-1 with TSB42AA9 bridge */ {
 294                 .firmware_revision      = 0x002800,
 295                 .model                  = 0x001010,
 296                 .workarounds            = SBP2_WORKAROUND_INQUIRY_36 |
 297                                           SBP2_WORKAROUND_MODE_SENSE_8,
 298         },
 299         /* Initio bridges, actually only needed for some older ones */ {
 300                 .firmware_revision      = 0x000200,
 301                 .model                  = ~0,
 302                 .workarounds            = SBP2_WORKAROUND_INQUIRY_36,
 303         },
 304         /* Symbios bridge */ {
 305                 .firmware_revision      = 0xa0b800,
 306                 .model                  = ~0,
 307                 .workarounds            = SBP2_WORKAROUND_128K_MAX_TRANS,
 308         },
 309
 310         /*
 311          * There are iPods (2nd gen, 3rd gen) with model_id == 0, but
 312          * these iPods do not feature the read_capacity bug according
 313          * to one report.  Read_capacity behaviour as well as model_id
 314          * could change due to Apple-supplied firmware updates though.
 315          */
 316
 317         /* iPod 4th generation. */ {
 318                 .firmware_revision      = 0x0a2700,
 319                 .model                  = 0x000021,
 320                 .workarounds            = SBP2_WORKAROUND_FIX_CAPACITY,
 321         },
 322         /* iPod mini */ {
 323                 .firmware_revision      = 0x0a2700,
 324                 .model                  = 0x000023,
 325                 .workarounds            = SBP2_WORKAROUND_FIX_CAPACITY,
 326         },
 327         /* iPod Photo */ {
 328                 .firmware_revision      = 0x0a2700,
 329                 .model                  = 0x00007e,
 330                 .workarounds            = SBP2_WORKAROUND_FIX_CAPACITY,
 331         }
 332 };
 333
 334 static void
 335 free_orb(struct kref *kref)
 336 {
 337         struct sbp2_orb *orb = container_of(kref, struct sbp2_orb, kref);
 338
 339         kfree(orb);
 340 }
 341
 342 static void
 343 sbp2_status_write(struct fw_card *card, struct fw_request *request,
 344                   int tcode, int destination, int source,
 345                   int generation, int speed,
 346                   unsigned long long offset,
 347                   void *payload, size_t length, void *callback_data)
 348 {
 349         struct sbp2_logical_unit *lu = callback_data;
 350         struct sbp2_orb *orb;
 351         struct sbp2_status status;
 352         size_t header_size;
 353         unsigned long flags;
 354
 355         if (tcode != TCODE_WRITE_BLOCK_REQUEST ||
 356             length == 0 || length > sizeof(status)) {
 357                 fw_send_response(card, request, RCODE_TYPE_ERROR);
 358                 return;
 359         }
 360
 361         header_size = min(length, 2 * sizeof(u32));
 362         fw_memcpy_from_be32(&status, payload, header_size);
 363         if (length > header_size)
 364                 memcpy(status.data, payload + 8, length - header_size);
 365         if (STATUS_GET_SOURCE(status) == 2 || STATUS_GET_SOURCE(status) == 3) {
 366                 fw_notify("non-orb related status write, not handled\n");
 367                 fw_send_response(card, request, RCODE_COMPLETE);
 368                 return;
 369         }
 370
 371         /* Lookup the orb corresponding to this status write. */
 372         spin_lock_irqsave(&card->lock, flags);
 373         list_for_each_entry(orb, &lu->orb_list, link) {
 374                 if (STATUS_GET_ORB_HIGH(status) == 0 &&
 375                     STATUS_GET_ORB_LOW(status) == orb->request_bus) {
 376                         orb->rcode = RCODE_COMPLETE;
 377                         list_del(&orb->link);
 378                         break;
 379                 }
 380         }
 381         spin_unlock_irqrestore(&card->lock, flags);
 382
 383         if (&orb->link != &lu->orb_list)
 384                 orb->callback(orb, &status);
 385         else
 386                 fw_error("status write for unknown orb\n");
 387
 388         kref_put(&orb->kref, free_orb);
 389
 390         fw_send_response(card, request, RCODE_COMPLETE);
 391 }
 392
 393 static void
 394 complete_transaction(struct fw_card *card, int rcode,
 395                      void *payload, size_t length, void *data)
 396 {
 397         struct sbp2_orb *orb = data;
 398         unsigned long flags;
 399
 400         /*
 401          * This is a little tricky.  We can get the status write for
 402          * the orb before we get this callback.  The status write
 403          * handler above will assume the orb pointer transaction was
 404          * successful and set the rcode to RCODE_COMPLETE for the orb.
 405          * So this callback only sets the rcode if it hasn't already
 406          * been set and only does the cleanup if the transaction
 407          * failed and we didn't already get a status write.
 408          */
 409         spin_lock_irqsave(&card->lock, flags);
 410
 411         if (orb->rcode == -1)
 412                 orb->rcode = rcode;
 413         if (orb->rcode != RCODE_COMPLETE) {
 414                 list_del(&orb->link);
 415                 spin_unlock_irqrestore(&card->lock, flags);
 416                 orb->callback(orb, NULL);
 417         } else {
 418                 spin_unlock_irqrestore(&card->lock, flags);
 419         }
 420
 421         kref_put(&orb->kref, free_orb);
 422 }
 423
 424 static void
 425 sbp2_send_orb(struct sbp2_orb *orb, struct sbp2_logical_unit *lu,
 426               int node_id, int generation, u64 offset)
 427 {
 428         struct fw_device *device = fw_device(lu->tgt->unit->device.parent);
 429         unsigned long flags;
 430
 431         orb->pointer.high = 0;
 432         orb->pointer.low = orb->request_bus;
 433         fw_memcpy_to_be32(&orb->pointer, &orb->pointer, sizeof(orb->pointer));
 434
 435         spin_lock_irqsave(&device->card->lock, flags);
 436         list_add_tail(&orb->link, &lu->orb_list);
 437         spin_unlock_irqrestore(&device->card->lock, flags);
 438
 439         /* Take a ref for the orb list and for the transaction callback. */
 440         kref_get(&orb->kref);
 441         kref_get(&orb->kref);
 442
 443         fw_send_request(device->card, &orb->t, TCODE_WRITE_BLOCK_REQUEST,
 444                         node_id, generation, device->max_speed, offset,
 445                         &orb->pointer, sizeof(orb->pointer),
 446                         complete_transaction, orb);
 447 }
 448
 449 static int sbp2_cancel_orbs(struct sbp2_logical_unit *lu)
 450 {
 451         struct fw_device *device = fw_device(lu->tgt->unit->device.parent);
 452         struct sbp2_orb *orb, *next;
 453         struct list_head list;
 454         unsigned long flags;
 455         int retval = -ENOENT;
 456
 457         INIT_LIST_HEAD(&list);
 458         spin_lock_irqsave(&device->card->lock, flags);
 459         list_splice_init(&lu->orb_list, &list);
 460         spin_unlock_irqrestore(&device->card->lock, flags);
 461
 462         list_for_each_entry_safe(orb, next, &list, link) {
 463                 retval = 0;
 464                 if (fw_cancel_transaction(device->card, &orb->t) == 0)
 465                         continue;
 466
 467                 orb->rcode = RCODE_CANCELLED;
 468                 orb->callback(orb, NULL);
 469         }
 470
 471         return retval;
 472 }
 473
 474 static void
 475 complete_management_orb(struct sbp2_orb *base_orb, struct sbp2_status *status)
 476 {
 477         struct sbp2_management_orb *orb =
 478                 container_of(base_orb, struct sbp2_management_orb, base);
 479
 480         if (status)
 481                 memcpy(&orb->status, status, sizeof(*status));
 482         complete(&orb->done);
 483 }
 484
 485 static int
 486 sbp2_send_management_orb(struct sbp2_logical_unit *lu, int node_id,
 487                          int generation, int function, int lun_or_login_id,
 488                          void *response)
 489 {
 490         struct fw_device *device = fw_device(lu->tgt->unit->device.parent);
 491         struct sbp2_management_orb *orb;
 492         int retval = -ENOMEM;
 493
 494         orb = kzalloc(sizeof(*orb), GFP_ATOMIC);
 495         if (orb == NULL)
 496                 return -ENOMEM;
 497
 498         kref_init(&orb->base.kref);
 499         orb->response_bus =
 500                 dma_map_single(device->card->device, &orb->response,
 501                                sizeof(orb->response), DMA_FROM_DEVICE);
 502         if (dma_mapping_error(orb->response_bus))
 503                 goto fail_mapping_response;
 504
 505         orb->request.response.high    = 0;
 506         orb->request.response.low     = orb->response_bus;
 507
 508         orb->request.misc =
 509                 MANAGEMENT_ORB_NOTIFY |
 510                 MANAGEMENT_ORB_FUNCTION(function) |
 511                 MANAGEMENT_ORB_LUN(lun_or_login_id);
 512         orb->request.length =
 513                 MANAGEMENT_ORB_RESPONSE_LENGTH(sizeof(orb->response));
 514
 515         orb->request.status_fifo.high = lu->address_handler.offset >> 32;
 516         orb->request.status_fifo.low  = lu->address_handler.offset;
 517
 518         if (function == SBP2_LOGIN_REQUEST) {
 519                 orb->request.misc |=
 520                         MANAGEMENT_ORB_EXCLUSIVE(sbp2_param_exclusive_login) |
 521                         MANAGEMENT_ORB_RECONNECT(0);
 522         }
 523
 524         fw_memcpy_to_be32(&orb->request, &orb->request, sizeof(orb->request));
 525
 526         init_completion(&orb->done);
 527         orb->base.callback = complete_management_orb;
 528
 529         orb->base.request_bus =
 530                 dma_map_single(device->card->device, &orb->request,
 531                                sizeof(orb->request), DMA_TO_DEVICE);
 532         if (dma_mapping_error(orb->base.request_bus))
 533                 goto fail_mapping_request;
 534
 535         sbp2_send_orb(&orb->base, lu, node_id, generation,
 536                       lu->tgt->management_agent_address);
 537
 538         wait_for_completion_timeout(&orb->done,
 539                                     msecs_to_jiffies(SBP2_ORB_TIMEOUT));
 540
 541         retval = -EIO;
 542         if (sbp2_cancel_orbs(lu) == 0) {
 543                 fw_error("orb reply timed out, rcode=0x%02x\n",
 544                          orb->base.rcode);
 545                 goto out;
 546         }
 547
 548         if (orb->base.rcode != RCODE_COMPLETE) {
 549                 fw_error("management write failed, rcode 0x%02x\n",
 550                          orb->base.rcode);
 551                 goto out;
 552         }
 553
 554         if (STATUS_GET_RESPONSE(orb->status) != 0 ||
 555             STATUS_GET_SBP_STATUS(orb->status) != 0) {
 556                 fw_error("error status: %d:%d\n",
 557                          STATUS_GET_RESPONSE(orb->status),
 558                          STATUS_GET_SBP_STATUS(orb->status));
 559                 goto out;
 560         }
 561
 562         retval = 0;
 563  out:
 564         dma_unmap_single(device->card->device, orb->base.request_bus,
 565                          sizeof(orb->request), DMA_TO_DEVICE);
 566  fail_mapping_request:
 567         dma_unmap_single(device->card->device, orb->response_bus,
 568                          sizeof(orb->response), DMA_FROM_DEVICE);
 569  fail_mapping_response:
 570         if (response)
 571                 fw_memcpy_from_be32(response,
 572                                     orb->response, sizeof(orb->response));
 573         kref_put(&orb->base.kref, free_orb);
 574
 575         return retval;
 576 }
 577
 578 static void
 579 complete_agent_reset_write(struct fw_card *card, int rcode,
 580                            void *payload, size_t length, void *data)
 581 {
 582         struct fw_transaction *t = data;
 583
 584         kfree(t);
 585 }
 586
 587 static int sbp2_agent_reset(struct sbp2_logical_unit *lu)
 588 {
 589         struct fw_device *device = fw_device(lu->tgt->unit->device.parent);
 590         struct fw_transaction *t;
 591         static u32 zero;
 592
 593         t = kzalloc(sizeof(*t), GFP_ATOMIC);
 594         if (t == NULL)
 595                 return -ENOMEM;
 596
 597         fw_send_request(device->card, t, TCODE_WRITE_QUADLET_REQUEST,
 598                         lu->tgt->node_id, lu->generation, device->max_speed,
 599                         lu->command_block_agent_address + SBP2_AGENT_RESET,
 600                         &zero, sizeof(zero), complete_agent_reset_write, t);
 601
 602         return 0;
 603 }
 604
 605 static void sbp2_release_target(struct kref *kref)
 606 {
 607         struct sbp2_target *tgt = container_of(kref, struct sbp2_target, kref);
 608         struct sbp2_logical_unit *lu, *next;
 609         struct Scsi_Host *shost =
 610                 container_of((void *)tgt, struct Scsi_Host, hostdata[0]);
 611
 612         list_for_each_entry_safe(lu, next, &tgt->lu_list, link) {
 613                 if (lu->sdev)
 614                         scsi_remove_device(lu->sdev);
 615
 616                 sbp2_send_management_orb(lu, tgt->node_id, lu->generation,
 617                                 SBP2_LOGOUT_REQUEST, lu->login_id, NULL);
 618                 fw_core_remove_address_handler(&lu->address_handler);
 619                 list_del(&lu->link);
 620                 kfree(lu);
 621         }
 622         scsi_remove_host(shost);
 623         fw_notify("released %s\n", tgt->unit->device.bus_id);
 624
 625         put_device(&tgt->unit->device);
 626         scsi_host_put(shost);
 627 }
 628
 629 static struct workqueue_struct *sbp2_wq;
 630
 631 static void sbp2_reconnect(struct work_struct *work);
 632
 633 static void sbp2_login(struct work_struct *work)
 634 {
 635         struct sbp2_logical_unit *lu =
 636                 container_of(work, struct sbp2_logical_unit, work.work);
 637         struct Scsi_Host *shost =
 638                 container_of((void *)lu->tgt, struct Scsi_Host, hostdata[0]);
 639         struct scsi_device *sdev;
 640         struct scsi_lun eight_bytes_lun;
 641         struct fw_unit *unit = lu->tgt->unit;
 642         struct fw_device *device = fw_device(unit->device.parent);
 643         struct sbp2_login_response response;
 644         int generation, node_id, local_node_id;
 645
 646         generation    = device->card->generation;
 647         node_id       = device->node->node_id;
 648         local_node_id = device->card->local_node->node_id;
 649
 650         if (sbp2_send_management_orb(lu, node_id, generation,
 651                                 SBP2_LOGIN_REQUEST, lu->lun, &response) < 0) {
 652                 if (lu->retries++ < 5) {
 653                         if (queue_delayed_work(sbp2_wq, &lu->work,
 654                                                DIV_ROUND_UP(HZ, 5)))
 655                                 kref_get(&lu->tgt->kref);
 656                 } else {
 657                         fw_error("failed to login to %s LUN %04x\n",
 658                                  unit->device.bus_id, lu->lun);
 659                 }
 660                 kref_put(&lu->tgt->kref, sbp2_release_target);
 661                 return;
 662         }
 663
 664         lu->generation        = generation;
 665         lu->tgt->node_id      = node_id;
 666         lu->tgt->address_high = local_node_id << 16;
 667
 668         /* Get command block agent offset and login id. */
 669         lu->command_block_agent_address =
 670                 ((u64) (response.command_block_agent.high & 0xffff) << 32) |
 671                 response.command_block_agent.low;
 672         lu->login_id = LOGIN_RESPONSE_GET_LOGIN_ID(response);
 673
 674         fw_notify("logged in to %s LUN %04x (%d retries)\n",
 675                   unit->device.bus_id, lu->lun, lu->retries);
 676
 677 #if 0
 678         /* FIXME: The linux1394 sbp2 does this last step. */
 679         sbp2_set_busy_timeout(scsi_id);
 680 #endif
 681
 682         PREPARE_DELAYED_WORK(&lu->work, sbp2_reconnect);
 683         sbp2_agent_reset(lu);
 684
 685         memset(&eight_bytes_lun, 0, sizeof(eight_bytes_lun));
 686         eight_bytes_lun.scsi_lun[0] = (lu->lun >> 8) & 0xff;
 687         eight_bytes_lun.scsi_lun[1] = lu->lun & 0xff;
 688
 689         sdev = __scsi_add_device(shost, 0, 0,
 690                                  scsilun_to_int(&eight_bytes_lun), lu);
 691         if (IS_ERR(sdev)) {
 692                 sbp2_send_management_orb(lu, node_id, generation,
 693                                 SBP2_LOGOUT_REQUEST, lu->login_id, NULL);
 694                 /*
 695                  * Set this back to sbp2_login so we fall back and
 696                  * retry login on bus reset.
 697                  */
 698                 PREPARE_DELAYED_WORK(&lu->work, sbp2_login);
 699         } else {
 700                 lu->sdev = sdev;
 701                 scsi_device_put(sdev);
 702         }
 703         kref_put(&lu->tgt->kref, sbp2_release_target);
 704 }
 705
 706 static int sbp2_add_logical_unit(struct sbp2_target *tgt, int lun_entry)
 707 {
 708         struct sbp2_logical_unit *lu;
 709
 710         lu = kmalloc(sizeof(*lu), GFP_KERNEL);
 711         if (!lu)
 712                 return -ENOMEM;
 713
 714         lu->address_handler.length           = 0x100;
 715         lu->address_handler.address_callback = sbp2_status_write;
 716         lu->address_handler.callback_data    = lu;
 717
 718         if (fw_core_add_address_handler(&lu->address_handler,
 719                                         &fw_high_memory_region) < 0) {
 720                 kfree(lu);
 721                 return -ENOMEM;
 722         }
 723
 724         lu->tgt  = tgt;
 725         lu->sdev = NULL;
 726         lu->lun  = lun_entry & 0xffff;
 727         lu->retries = 0;
 728         INIT_LIST_HEAD(&lu->orb_list);
 729         INIT_DELAYED_WORK(&lu->work, sbp2_login);
 730
 731         list_add_tail(&lu->link, &tgt->lu_list);
 732         return 0;
 733 }
 734
 735 static int sbp2_scan_logical_unit_dir(struct sbp2_target *tgt, u32 *directory)
 736 {
 737         struct fw_csr_iterator ci;
 738         int key, value;
 739
 740         fw_csr_iterator_init(&ci, directory);
 741         while (fw_csr_iterator_next(&ci, &key, &value))
 742                 if (key == SBP2_CSR_LOGICAL_UNIT_NUMBER &&
 743                     sbp2_add_logical_unit(tgt, value) < 0)
 744                         return -ENOMEM;
 745         return 0;
 746 }
 747
 748 static int sbp2_scan_unit_dir(struct sbp2_target *tgt, u32 *directory,
 749                               u32 *model, u32 *firmware_revision)
 750 {
 751         struct fw_csr_iterator ci;
 752         int key, value;
 753
 754         fw_csr_iterator_init(&ci, directory);
 755         while (fw_csr_iterator_next(&ci, &key, &value)) {
 756                 switch (key) {
 757
 758                 case CSR_DEPENDENT_INFO | CSR_OFFSET:
 759                         tgt->management_agent_address =
 760                                         CSR_REGISTER_BASE + 4 * value;
 761                         break;
 762
 763                 case CSR_DIRECTORY_ID:
 764                         tgt->directory_id = value;
 765                         break;
 766
 767                 case CSR_MODEL:
 768                         *model = value;
 769                         break;
 770
 771                 case SBP2_CSR_FIRMWARE_REVISION:
 772                         *firmware_revision = value;
 773                         break;
 774
 775                 case SBP2_CSR_LOGICAL_UNIT_NUMBER:
 776                         if (sbp2_add_logical_unit(tgt, value) < 0)
 777                                 return -ENOMEM;
 778                         break;
 779
 780                 case SBP2_CSR_LOGICAL_UNIT_DIRECTORY:
 781                         if (sbp2_scan_logical_unit_dir(tgt, ci.p + value) < 0)
 782                                 return -ENOMEM;
 783                         break;
 784                 }
 785         }
 786         return 0;
 787 }
 788
 789 static void sbp2_init_workarounds(struct sbp2_target *tgt, u32 model,
 790                                   u32 firmware_revision)
 791 {
 792         int i;
 793         unsigned w = sbp2_param_workarounds;
 794
 795         if (w)
 796                 fw_notify("Please notify linux1394-devel@lists.sourceforge.net "
 797                           "if you need the workarounds parameter for %s\n",
 798                           tgt->unit->device.bus_id);
 799
 800         if (w & SBP2_WORKAROUND_OVERRIDE)
 801                 goto out;
 802
 803         for (i = 0; i < ARRAY_SIZE(sbp2_workarounds_table); i++) {
 804
 805                 if (sbp2_workarounds_table[i].firmware_revision !=
 806                     (firmware_revision & 0xffffff00))
 807                         continue;
 808
 809                 if (sbp2_workarounds_table[i].model != model &&
 810                     sbp2_workarounds_table[i].model != ~0)
 811                         continue;
 812
 813                 w |= sbp2_workarounds_table[i].workarounds;
 814                 break;
 815         }
 816  out:
 817         if (w)
 818                 fw_notify("Workarounds for %s: 0x%x "
 819                           "(firmware_revision 0x%06x, model_id 0x%06x)\n",
 820                           tgt->unit->device.bus_id,
 821                           w, firmware_revision, model);
 822         tgt->workarounds = w;
 823 }
 824
 825 static struct scsi_host_template scsi_driver_template;
 826
 827 static int sbp2_probe(struct device *dev)
 828 {
 829         struct fw_unit *unit = fw_unit(dev);
 830         struct fw_device *device = fw_device(unit->device.parent);
 831         struct sbp2_target *tgt;
 832         struct sbp2_logical_unit *lu;
 833         struct Scsi_Host *shost;
 834         u32 model, firmware_revision;
 835
 836         shost = scsi_host_alloc(&scsi_driver_template, sizeof(*tgt));
 837         if (shost == NULL)
 838                 return -ENOMEM;
 839
 840         tgt = (struct sbp2_target *)shost->hostdata;
 841         unit->device.driver_data = tgt;
 842         tgt->unit = unit;
 843         kref_init(&tgt->kref);
 844         INIT_LIST_HEAD(&tgt->lu_list);
 845
 846         if (fw_device_enable_phys_dma(device) < 0)
 847                 goto fail_shost_put;
 848
 849         if (scsi_add_host(shost, &unit->device) < 0)
 850                 goto fail_shost_put;
 851
 852         /* Initialize to values that won't match anything in our table. */
 853         firmware_revision = 0xff000000;
 854         model = 0xff000000;
 855
 856         /* implicit directory ID */
 857         tgt->directory_id = ((unit->directory - device->config_rom) * 4
 858                              + CSR_CONFIG_ROM) & 0xffffff;
 859
 860         if (sbp2_scan_unit_dir(tgt, unit->directory, &model,
 861                                &firmware_revision) < 0)
 862                 goto fail_tgt_put;
 863
 864         sbp2_init_workarounds(tgt, model, firmware_revision);
 865
 866         get_device(&unit->device);
 867
 868         /*
 869          * We schedule work to do the login so we can easily
 870          * reschedule retries. Always get the ref before scheduling
 871          * work.
 872          */
 873         list_for_each_entry(lu, &tgt->lu_list, link)
 874                 if (queue_delayed_work(sbp2_wq, &lu->work, 0))
 875                         kref_get(&tgt->kref);
 876         return 0;
 877
 878  fail_tgt_put:
 879         kref_put(&tgt->kref, sbp2_release_target);
 880         return -ENOMEM;
 881
 882  fail_shost_put:
 883         scsi_host_put(shost);
 884         return -ENOMEM;
 885 }
 886
 887 static int sbp2_remove(struct device *dev)
 888 {
 889         struct fw_unit *unit = fw_unit(dev);
 890         struct sbp2_target *tgt = unit->device.driver_data;
 891
 892         kref_put(&tgt->kref, sbp2_release_target);
 893         return 0;
 894 }
 895
 896 static void sbp2_reconnect(struct work_struct *work)
 897 {
 898         struct sbp2_logical_unit *lu =
 899                 container_of(work, struct sbp2_logical_unit, work.work);
 900         struct fw_unit *unit = lu->tgt->unit;
 901         struct fw_device *device = fw_device(unit->device.parent);
 902         int generation, node_id, local_node_id;
 903
 904         generation    = device->card->generation;
 905         node_id       = device->node->node_id;
 906         local_node_id = device->card->local_node->node_id;
 907
 908         if (sbp2_send_management_orb(lu, node_id, generation,
 909                                      SBP2_RECONNECT_REQUEST,
 910                                      lu->login_id, NULL) < 0) {
 911                 if (lu->retries++ >= 5) {
 912                         fw_error("failed to reconnect to %s\n",
 913                                  unit->device.bus_id);
 914                         /* Fall back and try to log in again. */
 915                         lu->retries = 0;
 916                         PREPARE_DELAYED_WORK(&lu->work, sbp2_login);
 917                 }
 918                 if (queue_delayed_work(sbp2_wq, &lu->work, DIV_ROUND_UP(HZ, 5)))
 919                         kref_get(&lu->tgt->kref);
 920                 kref_put(&lu->tgt->kref, sbp2_release_target);
 921                 return;
 922         }
 923
 924         lu->generation        = generation;
 925         lu->tgt->node_id      = node_id;
 926         lu->tgt->address_high = local_node_id << 16;
 927
 928         fw_notify("reconnected to %s LUN %04x (%d retries)\n",
 929                   unit->device.bus_id, lu->lun, lu->retries);
 930
 931         sbp2_agent_reset(lu);
 932         sbp2_cancel_orbs(lu);
 933
 934         kref_put(&lu->tgt->kref, sbp2_release_target);
 935 }
 936
 937 static void sbp2_update(struct fw_unit *unit)
 938 {
 939         struct sbp2_target *tgt = unit->device.driver_data;
 940         struct sbp2_logical_unit *lu;
 941
 942         fw_device_enable_phys_dma(fw_device(unit->device.parent));
 943
 944         /*
 945          * Fw-core serializes sbp2_update() against sbp2_remove().
 946          * Iteration over tgt->lu_list is therefore safe here.
 947          */
 948         list_for_each_entry(lu, &tgt->lu_list, link) {
 949                 lu->retries = 0;
 950                 if (queue_delayed_work(sbp2_wq, &lu->work, 0))
 951                         kref_get(&tgt->kref);
 952         }
 953 }
 954
 955 #define SBP2_UNIT_SPEC_ID_ENTRY 0x0000609e
 956 #define SBP2_SW_VERSION_ENTRY   0x00010483
 957
 958 static const struct fw_device_id sbp2_id_table[] = {
 959         {
 960                 .match_flags  = FW_MATCH_SPECIFIER_ID | FW_MATCH_VERSION,
 961                 .specifier_id = SBP2_UNIT_SPEC_ID_ENTRY,
 962                 .version      = SBP2_SW_VERSION_ENTRY,
 963         },
 964         { }
 965 };
 966
 967 static struct fw_driver sbp2_driver = {
 968         .driver   = {
 969                 .owner  = THIS_MODULE,
 970                 .name   = sbp2_driver_name,
 971                 .bus    = &fw_bus_type,
 972                 .probe  = sbp2_probe,
 973                 .remove = sbp2_remove,
 974         },
 975         .update   = sbp2_update,
 976         .id_table = sbp2_id_table,
 977 };
 978
 979 static unsigned int
 980 sbp2_status_to_sense_data(u8 *sbp2_status, u8 *sense_data)
 981 {
 982         int sam_status;
 983
 984         sense_data[0] = 0x70;
 985         sense_data[1] = 0x0;
 986         sense_data[2] = sbp2_status[1];
 987         sense_data[3] = sbp2_status[4];
 988         sense_data[4] = sbp2_status[5];
 989         sense_data[5] = sbp2_status[6];
 990         sense_data[6] = sbp2_status[7];
 991         sense_data[7] = 10;
 992         sense_data[8] = sbp2_status[8];
 993         sense_data[9] = sbp2_status[9];
 994         sense_data[10] = sbp2_status[10];
 995         sense_data[11] = sbp2_status[11];
 996         sense_data[12] = sbp2_status[2];
 997         sense_data[13] = sbp2_status[3];
 998         sense_data[14] = sbp2_status[12];
 999         sense_data[15] = sbp2_status[13];
1000
1001         sam_status = sbp2_status[0] & 0x3f;
1002
1003         switch (sam_status) {
1004         case SAM_STAT_GOOD:
1005         case SAM_STAT_CHECK_CONDITION:
1006         case SAM_STAT_CONDITION_MET:
1007         case SAM_STAT_BUSY:
1008         case SAM_STAT_RESERVATION_CONFLICT:
1009         case SAM_STAT_COMMAND_TERMINATED:
1010                 return DID_OK << 16 | sam_status;
1011
1012         default:
1013                 return DID_ERROR << 16;
1014         }
1015 }
1016
1017 static void
1018 complete_command_orb(struct sbp2_orb *base_orb, struct sbp2_status *status)
1019 {
1020         struct sbp2_command_orb *orb =
1021                 container_of(base_orb, struct sbp2_command_orb, base);
1022         struct fw_device *device = fw_device(orb->lu->tgt->unit->device.parent);
1023         int result;
1024
1025         if (status != NULL) {
1026                 if (STATUS_GET_DEAD(*status))
1027                         sbp2_agent_reset(orb->lu);
1028
1029                 switch (STATUS_GET_RESPONSE(*status)) {
1030                 case SBP2_STATUS_REQUEST_COMPLETE:
1031                         result = DID_OK << 16;
1032                         break;
1033                 case SBP2_STATUS_TRANSPORT_FAILURE:
1034                         result = DID_BUS_BUSY << 16;
1035                         break;
1036                 case SBP2_STATUS_ILLEGAL_REQUEST:
1037                 case SBP2_STATUS_VENDOR_DEPENDENT:
1038                 default:
1039                         result = DID_ERROR << 16;
1040                         break;
1041                 }
1042
1043                 if (result == DID_OK << 16 && STATUS_GET_LEN(*status) > 1)
1044                         result = sbp2_status_to_sense_data(STATUS_GET_DATA(*status),
1045                                                            orb->cmd->sense_buffer);
1046         } else {
1047                 /*
1048                  * If the orb completes with status == NULL, something
1049                  * went wrong, typically a bus reset happened mid-orb
1050                  * or when sending the write (less likely).
1051                  */
1052                 result = DID_BUS_BUSY << 16;
1053         }
1054
1055         dma_unmap_single(device->card->device, orb->base.request_bus,
1056                          sizeof(orb->request), DMA_TO_DEVICE);
1057
1058         if (scsi_sg_count(orb->cmd) > 0)
1059                 dma_unmap_sg(device->card->device, scsi_sglist(orb->cmd),
1060                              scsi_sg_count(orb->cmd),
1061                              orb->cmd->sc_data_direction);
1062
1063         if (orb->page_table_bus != 0)
1064                 dma_unmap_single(device->card->device, orb->page_table_bus,
1065                                  sizeof(orb->page_table), DMA_TO_DEVICE);
1066
1067         orb->cmd->result = result;
1068         orb->done(orb->cmd);
1069 }
1070
1071 static int
1072 sbp2_map_scatterlist(struct sbp2_command_orb *orb, struct fw_device *device,
1073                      struct sbp2_logical_unit *lu)
1074 {
1075         struct scatterlist *sg;
1076         int sg_len, l, i, j, count;
1077         dma_addr_t sg_addr;
1078
1079         sg = scsi_sglist(orb->cmd);
1080         count = dma_map_sg(device->card->device, sg, scsi_sg_count(orb->cmd),
1081                            orb->cmd->sc_data_direction);
1082         if (count == 0)
1083                 goto fail;
1084
1085         /*
1086          * Handle the special case where there is only one element in
1087          * the scatter list by converting it to an immediate block
1088          * request. This is also a workaround for broken devices such
1089          * as the second generation iPod which doesn't support page
1090          * tables.
1091          */
1092         if (count == 1 && sg_dma_len(sg) < SBP2_MAX_SG_ELEMENT_LENGTH) {
1093                 orb->request.data_descriptor.high = lu->tgt->address_high;
1094                 orb->request.data_descriptor.low  = sg_dma_address(sg);
1095                 orb->request.misc |= COMMAND_ORB_DATA_SIZE(sg_dma_len(sg));
1096                 return 0;
1097         }
1098
1099         /*
1100          * Convert the scatterlist to an sbp2 page table.  If any
1101          * scatterlist entries are too big for sbp2, we split them as we
1102          * go.  Even if we ask the block I/O layer to not give us sg
1103          * elements larger than 65535 bytes, some IOMMUs may merge sg elements
1104          * during DMA mapping, and Linux currently doesn't prevent this.
1105          */
1106         for (i = 0, j = 0; i < count; i++) {
1107                 sg_len = sg_dma_len(sg + i);
1108                 sg_addr = sg_dma_address(sg + i);
1109                 while (sg_len) {
1110                         /* FIXME: This won't get us out of the pinch. */
1111                         if (unlikely(j >= ARRAY_SIZE(orb->page_table))) {
1112                                 fw_error("page table overflow\n");
1113                                 goto fail_page_table;
1114                         }
1115                         l = min(sg_len, SBP2_MAX_SG_ELEMENT_LENGTH);
1116                         orb->page_table[j].low = sg_addr;
1117                         orb->page_table[j].high = (l << 16);
1118                         sg_addr += l;
1119                         sg_len -= l;
1120                         j++;
1121                 }
1122         }
1123
1124         fw_memcpy_to_be32(orb->page_table, orb->page_table,
1125                           sizeof(orb->page_table[0]) * j);
1126         orb->page_table_bus =
1127                 dma_map_single(device->card->device, orb->page_table,
1128                                sizeof(orb->page_table), DMA_TO_DEVICE);
1129         if (dma_mapping_error(orb->page_table_bus))
1130                 goto fail_page_table;
1131
1132         /*
1133          * The data_descriptor pointer is the one case where we need
1134          * to fill in the node ID part of the address.  All other
1135          * pointers assume that the data referenced reside on the
1136          * initiator (i.e. us), but data_descriptor can refer to data
1137          * on other nodes so we need to put our ID in descriptor.high.
1138          */
1139         orb->request.data_descriptor.high = lu->tgt->address_high;
1140         orb->request.data_descriptor.low  = orb->page_table_bus;
1141         orb->request.misc |=
1142                 COMMAND_ORB_PAGE_TABLE_PRESENT |
1143                 COMMAND_ORB_DATA_SIZE(j);
1144
1145         return 0;
1146
1147  fail_page_table:
1148         dma_unmap_sg(device->card->device, sg, scsi_sg_count(orb->cmd),
1149                      orb->cmd->sc_data_direction);
1150  fail:
1151         return -ENOMEM;
1152 }
1153
1154 /* SCSI stack integration */
1155
1156 static int sbp2_scsi_queuecommand(struct scsi_cmnd *cmd, scsi_done_fn_t done)
1157 {
1158         struct sbp2_logical_unit *lu = cmd->device->hostdata;
1159         struct fw_device *device = fw_device(lu->tgt->unit->device.parent);
1160         struct sbp2_command_orb *orb;
1161         unsigned max_payload;
1162         int retval = SCSI_MLQUEUE_HOST_BUSY;
1163
1164         /*
1165          * Bidirectional commands are not yet implemented, and unknown
1166          * transfer direction not handled.
1167          */
1168         if (cmd->sc_data_direction == DMA_BIDIRECTIONAL) {
1169                 fw_error("Can't handle DMA_BIDIRECTIONAL, rejecting command\n");
1170                 cmd->result = DID_ERROR << 16;
1171                 done(cmd);
1172                 return 0;
1173         }
1174
1175         orb = kzalloc(sizeof(*orb), GFP_ATOMIC);
1176         if (orb == NULL) {
1177                 fw_notify("failed to alloc orb\n");
1178                 return SCSI_MLQUEUE_HOST_BUSY;
1179         }
1180
1181         /* Initialize rcode to something not RCODE_COMPLETE. */
1182         orb->base.rcode = -1;
1183         kref_init(&orb->base.kref);
1184
1185         orb->lu   = lu;
1186         orb->done = done;
1187         orb->cmd  = cmd;
1188
1189         orb->request.next.high   = SBP2_ORB_NULL;
1190         orb->request.next.low    = 0x0;
1191         /*
1192          * At speed 100 we can do 512 bytes per packet, at speed 200,
1193          * 1024 bytes per packet etc.  The SBP-2 max_payload field
1194          * specifies the max payload size as 2 ^ (max_payload + 2), so
1195          * if we set this to max_speed + 7, we get the right value.
1196          */
1197         max_payload = min(device->max_speed + 7,
1198                           device->card->max_receive - 1);
1199         orb->request.misc =
1200                 COMMAND_ORB_MAX_PAYLOAD(max_payload) |
1201                 COMMAND_ORB_SPEED(device->max_speed) |
1202                 COMMAND_ORB_NOTIFY;
1203
1204         if (cmd->sc_data_direction == DMA_FROM_DEVICE)
1205                 orb->request.misc |=
1206                         COMMAND_ORB_DIRECTION(SBP2_DIRECTION_FROM_MEDIA);
1207         else if (cmd->sc_data_direction == DMA_TO_DEVICE)
1208                 orb->request.misc |=
1209                         COMMAND_ORB_DIRECTION(SBP2_DIRECTION_TO_MEDIA);
1210
1211         if (scsi_sg_count(cmd) && sbp2_map_scatterlist(orb, device, lu) < 0)
1212                 goto out;
1213
1214         fw_memcpy_to_be32(&orb->request, &orb->request, sizeof(orb->request));
1215
1216         memset(orb->request.command_block,
1217                0, sizeof(orb->request.command_block));
1218         memcpy(orb->request.command_block, cmd->cmnd, COMMAND_SIZE(*cmd->cmnd));
1219
1220         orb->base.callback = complete_command_orb;
1221         orb->base.request_bus =
1222                 dma_map_single(device->card->device, &orb->request,
1223                                sizeof(orb->request), DMA_TO_DEVICE);
1224         if (dma_mapping_error(orb->base.request_bus))
1225                 goto out;
1226
1227         sbp2_send_orb(&orb->base, lu, lu->tgt->node_id, lu->generation,
1228                       lu->command_block_agent_address + SBP2_ORB_POINTER);
1229         retval = 0;
1230  out:
1231         kref_put(&orb->base.kref, free_orb);
1232         return retval;
1233 }
1234
1235 static int sbp2_scsi_slave_alloc(struct scsi_device *sdev)
1236 {
1237         struct sbp2_logical_unit *lu = sdev->hostdata;
1238
1239         sdev->allow_restart = 1;
1240
1241         /*
1242          * Update the dma alignment (minimum alignment requirements for
1243          * start and end of DMA transfers) to be a sector
1244          */
1245         blk_queue_update_dma_alignment(sdev->request_queue, 511);
1246
1247         if (lu->tgt->workarounds & SBP2_WORKAROUND_INQUIRY_36)
1248                 sdev->inquiry_len = 36;
1249
1250         return 0;
1251 }
1252
1253 static int sbp2_scsi_slave_configure(struct scsi_device *sdev)
1254 {
1255         struct sbp2_logical_unit *lu = sdev->hostdata;
1256
1257         sdev->use_10_for_rw = 1;
1258
1259         if (sdev->type == TYPE_ROM)
1260                 sdev->use_10_for_ms = 1;
1261
1262         if (sdev->type == TYPE_DISK &&
1263             lu->tgt->workarounds & SBP2_WORKAROUND_MODE_SENSE_8)
1264                 sdev->skip_ms_page_8 = 1;
1265
1266         if (lu->tgt->workarounds & SBP2_WORKAROUND_FIX_CAPACITY)
1267                 sdev->fix_capacity = 1;
1268
1269         if (lu->tgt->workarounds & SBP2_WORKAROUND_128K_MAX_TRANS)
1270                 blk_queue_max_sectors(sdev->request_queue, 128 * 1024 / 512);
1271
1272         return 0;
1273 }
1274
1275 /*
1276  * Called by scsi stack when something has really gone wrong.  Usually
1277  * called when a command has timed-out for some reason.
1278  */
1279 static int sbp2_scsi_abort(struct scsi_cmnd *cmd)
1280 {
1281         struct sbp2_logical_unit *lu = cmd->device->hostdata;
1282
1283         fw_notify("sbp2_scsi_abort\n");
1284         sbp2_agent_reset(lu);
1285         sbp2_cancel_orbs(lu);
1286
1287         return SUCCESS;
1288 }
1289
1290 /*
1291  * Format of /sys/bus/scsi/devices/.../ieee1394_id:
1292  * u64 EUI-64 : u24 directory_ID : u16 LUN  (all printed in hexadecimal)
1293  *
1294  * This is the concatenation of target port identifier and logical unit
1295  * identifier as per SAM-2...SAM-4 annex A.
1296  */
1297 static ssize_t
1298 sbp2_sysfs_ieee1394_id_show(struct device *dev, struct device_attribute *attr,
1299                             char *buf)
1300 {
1301         struct scsi_device *sdev = to_scsi_device(dev);
1302         struct sbp2_logical_unit *lu;
1303         struct fw_device *device;
1304
1305         if (!sdev)
1306                 return 0;
1307
1308         lu = sdev->hostdata;
1309         device = fw_device(lu->tgt->unit->device.parent);
1310
1311         return sprintf(buf, "%08x%08x:%06x:%04x\n",
1312                         device->config_rom[3], device->config_rom[4],
1313                         lu->tgt->directory_id, lu->lun);
1314 }
1315
1316 static DEVICE_ATTR(ieee1394_id, S_IRUGO, sbp2_sysfs_ieee1394_id_show, NULL);
1317
1318 static struct device_attribute *sbp2_scsi_sysfs_attrs[] = {
1319         &dev_attr_ieee1394_id,
1320         NULL
1321 };
1322
1323 static struct scsi_host_template scsi_driver_template = {
1324         .module                 = THIS_MODULE,
1325         .name                   = "SBP-2 IEEE-1394",
1326         .proc_name              = sbp2_driver_name,
1327         .queuecommand           = sbp2_scsi_queuecommand,
1328         .slave_alloc            = sbp2_scsi_slave_alloc,
1329         .slave_configure        = sbp2_scsi_slave_configure,
1330         .eh_abort_handler       = sbp2_scsi_abort,
1331         .this_id                = -1,
1332         .sg_tablesize           = SG_ALL,
1333         .use_clustering         = ENABLE_CLUSTERING,
1334         .cmd_per_lun            = 1,
1335         .can_queue              = 1,
1336         .sdev_attrs             = sbp2_scsi_sysfs_attrs,
1337 };
1338
1339 MODULE_AUTHOR("Kristian Hoegsberg <krh@bitplanet.net>");
1340 MODULE_DESCRIPTION("SCSI over IEEE1394");
1341 MODULE_LICENSE("GPL");
1342 MODULE_DEVICE_TABLE(ieee1394, sbp2_id_table);
1343
1344 /* Provide a module alias so root-on-sbp2 initrds don't break. */
1345 #ifndef CONFIG_IEEE1394_SBP2_MODULE
1346 MODULE_ALIAS("sbp2");
1347 #endif
1348
1349 static int __init sbp2_init(void)
1350 {
1351         sbp2_wq = create_singlethread_workqueue(KBUILD_MODNAME);
1352         if (!sbp2_wq)
1353                 return -ENOMEM;
1354
1355         return driver_register(&sbp2_driver.driver);
1356 }
1357
1358 static void __exit sbp2_cleanup(void)
1359 {
1360         driver_unregister(&sbp2_driver.driver);
1361         destroy_workqueue(sbp2_wq);
1362 }
1363
1364 module_init(sbp2_init);
1365 module_exit(sbp2_cleanup);