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/timer.h>
  41
  42 #include <scsi/scsi.h>
  43 #include <scsi/scsi_cmnd.h>
  44 #include <scsi/scsi_dbg.h>
  45 #include <scsi/scsi_device.h>
  46 #include <scsi/scsi_host.h>
  47
  48 #include "fw-transaction.h"
  49 #include "fw-topology.h"
  50 #include "fw-device.h"
  51
  52 /*
  53  * So far only bridges from Oxford Semiconductor are known to support
  54  * concurrent logins. Depending on firmware, four or two concurrent logins
  55  * are possible on OXFW911 and newer Oxsemi bridges.
  56  *
  57  * Concurrent logins are useful together with cluster filesystems.
  58  */
  59 static int sbp2_param_exclusive_login = 1;
  60 module_param_named(exclusive_login, sbp2_param_exclusive_login, bool, 0644);
  61 MODULE_PARM_DESC(exclusive_login, "Exclusive login to sbp2 device "
  62                  "(default = Y, use N for concurrent initiators)");
  63
  64 /* I don't know why the SCSI stack doesn't define something like this... */
  65 typedef void (*scsi_done_fn_t)(struct scsi_cmnd *);
  66
  67 static const char sbp2_driver_name[] = "sbp2";
  68
  69 struct sbp2_device {
  70         struct kref kref;
  71         struct fw_unit *unit;
  72         struct fw_address_handler address_handler;
  73         struct list_head orb_list;
  74         u64 management_agent_address;
  75         u64 command_block_agent_address;
  76         u32 workarounds;
  77         int login_id;
  78
  79         /*
  80          * We cache these addresses and only update them once we've
  81          * logged in or reconnected to the sbp2 device.  That way, any
  82          * IO to the device will automatically fail and get retried if
  83          * it happens in a window where the device is not ready to
  84          * handle it (e.g. after a bus reset but before we reconnect).
  85          */
  86         int node_id;
  87         int address_high;
  88         int generation;
  89
  90         int retries;
  91         struct delayed_work work;
  92 };
  93
  94 #define SBP2_MAX_SG_ELEMENT_LENGTH      0xf000
  95 #define SBP2_MAX_SECTORS                255     /* Max sectors supported */
  96 #define SBP2_ORB_TIMEOUT                2000    /* Timeout in ms */
  97
  98 #define SBP2_ORB_NULL                   0x80000000
  99
 100 #define SBP2_DIRECTION_TO_MEDIA         0x0
 101 #define SBP2_DIRECTION_FROM_MEDIA       0x1
 102
 103 /* Unit directory keys */
 104 #define SBP2_COMMAND_SET_SPECIFIER      0x38
 105 #define SBP2_COMMAND_SET                0x39
 106 #define SBP2_COMMAND_SET_REVISION       0x3b
 107 #define SBP2_FIRMWARE_REVISION          0x3c
 108
 109 /* Flags for detected oddities and brokeness */
 110 #define SBP2_WORKAROUND_128K_MAX_TRANS  0x1
 111 #define SBP2_WORKAROUND_INQUIRY_36      0x2
 112 #define SBP2_WORKAROUND_MODE_SENSE_8    0x4
 113 #define SBP2_WORKAROUND_FIX_CAPACITY    0x8
 114 #define SBP2_WORKAROUND_OVERRIDE        0x100
 115
 116 /* Management orb opcodes */
 117 #define SBP2_LOGIN_REQUEST              0x0
 118 #define SBP2_QUERY_LOGINS_REQUEST       0x1
 119 #define SBP2_RECONNECT_REQUEST          0x3
 120 #define SBP2_SET_PASSWORD_REQUEST       0x4
 121 #define SBP2_LOGOUT_REQUEST             0x7
 122 #define SBP2_ABORT_TASK_REQUEST         0xb
 123 #define SBP2_ABORT_TASK_SET             0xc
 124 #define SBP2_LOGICAL_UNIT_RESET         0xe
 125 #define SBP2_TARGET_RESET_REQUEST       0xf
 126
 127 /* Offsets for command block agent registers */
 128 #define SBP2_AGENT_STATE                0x00
 129 #define SBP2_AGENT_RESET                0x04
 130 #define SBP2_ORB_POINTER                0x08
 131 #define SBP2_DOORBELL                   0x10
 132 #define SBP2_UNSOLICITED_STATUS_ENABLE  0x14
 133
 134 /* Status write response codes */
 135 #define SBP2_STATUS_REQUEST_COMPLETE    0x0
 136 #define SBP2_STATUS_TRANSPORT_FAILURE   0x1
 137 #define SBP2_STATUS_ILLEGAL_REQUEST     0x2
 138 #define SBP2_STATUS_VENDOR_DEPENDENT    0x3
 139
 140 #define STATUS_GET_ORB_HIGH(v)          ((v).status & 0xffff)
 141 #define STATUS_GET_SBP_STATUS(v)        (((v).status >> 16) & 0xff)
 142 #define STATUS_GET_LEN(v)               (((v).status >> 24) & 0x07)
 143 #define STATUS_GET_DEAD(v)              (((v).status >> 27) & 0x01)
 144 #define STATUS_GET_RESPONSE(v)          (((v).status >> 28) & 0x03)
 145 #define STATUS_GET_SOURCE(v)            (((v).status >> 30) & 0x03)
 146 #define STATUS_GET_ORB_LOW(v)           ((v).orb_low)
 147 #define STATUS_GET_DATA(v)              ((v).data)
 148
 149 struct sbp2_status {
 150         u32 status;
 151         u32 orb_low;
 152         u8 data[24];
 153 };
 154
 155 struct sbp2_pointer {
 156         u32 high;
 157         u32 low;
 158 };
 159
 160 struct sbp2_orb {
 161         struct fw_transaction t;
 162         dma_addr_t request_bus;
 163         int rcode;
 164         struct sbp2_pointer pointer;
 165         void (*callback)(struct sbp2_orb * orb, struct sbp2_status * status);
 166         struct list_head link;
 167 };
 168
 169 #define MANAGEMENT_ORB_LUN(v)                   ((v))
 170 #define MANAGEMENT_ORB_FUNCTION(v)              ((v) << 16)
 171 #define MANAGEMENT_ORB_RECONNECT(v)             ((v) << 20)
 172 #define MANAGEMENT_ORB_EXCLUSIVE(v)             ((v) ? 1 << 28 : 0)
 173 #define MANAGEMENT_ORB_REQUEST_FORMAT(v)        ((v) << 29)
 174 #define MANAGEMENT_ORB_NOTIFY                   ((1) << 31)
 175
 176 #define MANAGEMENT_ORB_RESPONSE_LENGTH(v)       ((v))
 177 #define MANAGEMENT_ORB_PASSWORD_LENGTH(v)       ((v) << 16)
 178
 179 struct sbp2_management_orb {
 180         struct sbp2_orb base;
 181         struct {
 182                 struct sbp2_pointer password;
 183                 struct sbp2_pointer response;
 184                 u32 misc;
 185                 u32 length;
 186                 struct sbp2_pointer status_fifo;
 187         } request;
 188         __be32 response[4];
 189         dma_addr_t response_bus;
 190         struct completion done;
 191         struct sbp2_status status;
 192 };
 193
 194 #define LOGIN_RESPONSE_GET_LOGIN_ID(v)  ((v).misc & 0xffff)
 195 #define LOGIN_RESPONSE_GET_LENGTH(v)    (((v).misc >> 16) & 0xffff)
 196
 197 struct sbp2_login_response {
 198         u32 misc;
 199         struct sbp2_pointer command_block_agent;
 200         u32 reconnect_hold;
 201 };
 202 #define COMMAND_ORB_DATA_SIZE(v)        ((v))
 203 #define COMMAND_ORB_PAGE_SIZE(v)        ((v) << 16)
 204 #define COMMAND_ORB_PAGE_TABLE_PRESENT  ((1) << 19)
 205 #define COMMAND_ORB_MAX_PAYLOAD(v)      ((v) << 20)
 206 #define COMMAND_ORB_SPEED(v)            ((v) << 24)
 207 #define COMMAND_ORB_DIRECTION(v)        ((v) << 27)
 208 #define COMMAND_ORB_REQUEST_FORMAT(v)   ((v) << 29)
 209 #define COMMAND_ORB_NOTIFY              ((1) << 31)
 210
 211 struct sbp2_command_orb {
 212         struct sbp2_orb base;
 213         struct {
 214                 struct sbp2_pointer next;
 215                 struct sbp2_pointer data_descriptor;
 216                 u32 misc;
 217                 u8 command_block[12];
 218         } request;
 219         struct scsi_cmnd *cmd;
 220         scsi_done_fn_t done;
 221         struct fw_unit *unit;
 222
 223         struct sbp2_pointer page_table[SG_ALL] __attribute__((aligned(8)));
 224         dma_addr_t page_table_bus;
 225 };
 226
 227 /*
 228  * List of devices with known bugs.
 229  *
 230  * The firmware_revision field, masked with 0xffff00, is the best
 231  * indicator for the type of bridge chip of a device.  It yields a few
 232  * false positives but this did not break correctly behaving devices
 233  * so far.  We use ~0 as a wildcard, since the 24 bit values we get
 234  * from the config rom can never match that.
 235  */
 236 static const struct {
 237         u32 firmware_revision;
 238         u32 model;
 239         unsigned workarounds;
 240 } sbp2_workarounds_table[] = {
 241         /* DViCO Momobay CX-1 with TSB42AA9 bridge */ {
 242                 .firmware_revision      = 0x002800,
 243                 .model                  = 0x001010,
 244                 .workarounds            = SBP2_WORKAROUND_INQUIRY_36 |
 245                                           SBP2_WORKAROUND_MODE_SENSE_8,
 246         },
 247         /* Initio bridges, actually only needed for some older ones */ {
 248                 .firmware_revision      = 0x000200,
 249                 .model                  = ~0,
 250                 .workarounds            = SBP2_WORKAROUND_INQUIRY_36,
 251         },
 252         /* Symbios bridge */ {
 253                 .firmware_revision      = 0xa0b800,
 254                 .model                  = ~0,
 255                 .workarounds            = SBP2_WORKAROUND_128K_MAX_TRANS,
 256         },
 257
 258         /*
 259          * There are iPods (2nd gen, 3rd gen) with model_id == 0, but
 260          * these iPods do not feature the read_capacity bug according
 261          * to one report.  Read_capacity behaviour as well as model_id
 262          * could change due to Apple-supplied firmware updates though.
 263          */
 264
 265         /* iPod 4th generation. */ {
 266                 .firmware_revision      = 0x0a2700,
 267                 .model                  = 0x000021,
 268                 .workarounds            = SBP2_WORKAROUND_FIX_CAPACITY,
 269         },
 270         /* iPod mini */ {
 271                 .firmware_revision      = 0x0a2700,
 272                 .model                  = 0x000023,
 273                 .workarounds            = SBP2_WORKAROUND_FIX_CAPACITY,
 274         },
 275         /* iPod Photo */ {
 276                 .firmware_revision      = 0x0a2700,
 277                 .model                  = 0x00007e,
 278                 .workarounds            = SBP2_WORKAROUND_FIX_CAPACITY,
 279         }
 280 };
 281
 282 static void
 283 sbp2_status_write(struct fw_card *card, struct fw_request *request,
 284                   int tcode, int destination, int source,
 285                   int generation, int speed,
 286                   unsigned long long offset,
 287                   void *payload, size_t length, void *callback_data)
 288 {
 289         struct sbp2_device *sd = callback_data;
 290         struct sbp2_orb *orb;
 291         struct sbp2_status status;
 292         size_t header_size;
 293         unsigned long flags;
 294
 295         if (tcode != TCODE_WRITE_BLOCK_REQUEST ||
 296             length == 0 || length > sizeof(status)) {
 297                 fw_send_response(card, request, RCODE_TYPE_ERROR);
 298                 return;
 299         }
 300
 301         header_size = min(length, 2 * sizeof(u32));
 302         fw_memcpy_from_be32(&status, payload, header_size);
 303         if (length > header_size)
 304                 memcpy(status.data, payload + 8, length - header_size);
 305         if (STATUS_GET_SOURCE(status) == 2 || STATUS_GET_SOURCE(status) == 3) {
 306                 fw_notify("non-orb related status write, not handled\n");
 307                 fw_send_response(card, request, RCODE_COMPLETE);
 308                 return;
 309         }
 310
 311         /* Lookup the orb corresponding to this status write. */
 312         spin_lock_irqsave(&card->lock, flags);
 313         list_for_each_entry(orb, &sd->orb_list, link) {
 314                 if (STATUS_GET_ORB_HIGH(status) == 0 &&
 315                     STATUS_GET_ORB_LOW(status) == orb->request_bus &&
 316                     orb->rcode == RCODE_COMPLETE) {
 317                         list_del(&orb->link);
 318                         break;
 319                 }
 320         }
 321         spin_unlock_irqrestore(&card->lock, flags);
 322
 323         if (&orb->link != &sd->orb_list)
 324                 orb->callback(orb, &status);
 325         else
 326                 fw_error("status write for unknown orb\n");
 327
 328         fw_send_response(card, request, RCODE_COMPLETE);
 329 }
 330
 331 static void
 332 complete_transaction(struct fw_card *card, int rcode,
 333                      void *payload, size_t length, void *data)
 334 {
 335         struct sbp2_orb *orb = data;
 336         unsigned long flags;
 337
 338         orb->rcode = rcode;
 339         if (rcode != RCODE_COMPLETE) {
 340                 spin_lock_irqsave(&card->lock, flags);
 341                 list_del(&orb->link);
 342                 spin_unlock_irqrestore(&card->lock, flags);
 343                 orb->callback(orb, NULL);
 344         }
 345 }
 346
 347 static void
 348 sbp2_send_orb(struct sbp2_orb *orb, struct fw_unit *unit,
 349               int node_id, int generation, u64 offset)
 350 {
 351         struct fw_device *device = fw_device(unit->device.parent);
 352         struct sbp2_device *sd = unit->device.driver_data;
 353         unsigned long flags;
 354
 355         orb->pointer.high = 0;
 356         orb->pointer.low = orb->request_bus;
 357         fw_memcpy_to_be32(&orb->pointer, &orb->pointer, sizeof(orb->pointer));
 358
 359         spin_lock_irqsave(&device->card->lock, flags);
 360         list_add_tail(&orb->link, &sd->orb_list);
 361         spin_unlock_irqrestore(&device->card->lock, flags);
 362
 363         fw_send_request(device->card, &orb->t, TCODE_WRITE_BLOCK_REQUEST,
 364                         node_id, generation, device->max_speed, offset,
 365                         &orb->pointer, sizeof(orb->pointer),
 366                         complete_transaction, orb);
 367 }
 368
 369 static int sbp2_cancel_orbs(struct fw_unit *unit)
 370 {
 371         struct fw_device *device = fw_device(unit->device.parent);
 372         struct sbp2_device *sd = unit->device.driver_data;
 373         struct sbp2_orb *orb, *next;
 374         struct list_head list;
 375         unsigned long flags;
 376         int retval = -ENOENT;
 377
 378         INIT_LIST_HEAD(&list);
 379         spin_lock_irqsave(&device->card->lock, flags);
 380         list_splice_init(&sd->orb_list, &list);
 381         spin_unlock_irqrestore(&device->card->lock, flags);
 382
 383         list_for_each_entry_safe(orb, next, &list, link) {
 384                 retval = 0;
 385                 if (fw_cancel_transaction(device->card, &orb->t) == 0)
 386                         continue;
 387
 388                 orb->rcode = RCODE_CANCELLED;
 389                 orb->callback(orb, NULL);
 390         }
 391
 392         return retval;
 393 }
 394
 395 static void
 396 complete_management_orb(struct sbp2_orb *base_orb, struct sbp2_status *status)
 397 {
 398         struct sbp2_management_orb *orb =
 399                 container_of(base_orb, struct sbp2_management_orb, base);
 400
 401         if (status)
 402                 memcpy(&orb->status, status, sizeof(*status));
 403         complete(&orb->done);
 404 }
 405
 406 static int
 407 sbp2_send_management_orb(struct fw_unit *unit, int node_id, int generation,
 408                          int function, int lun, void *response)
 409 {
 410         struct fw_device *device = fw_device(unit->device.parent);
 411         struct sbp2_device *sd = unit->device.driver_data;
 412         struct sbp2_management_orb *orb;
 413         int retval = -ENOMEM;
 414
 415         orb = kzalloc(sizeof(*orb), GFP_ATOMIC);
 416         if (orb == NULL)
 417                 return -ENOMEM;
 418
 419         /*
 420          * The sbp2 device is going to send a block read request to
 421          * read out the request from host memory, so map it for dma.
 422          */
 423         orb->base.request_bus =
 424                 dma_map_single(device->card->device, &orb->request,
 425                                sizeof(orb->request), DMA_TO_DEVICE);
 426         if (dma_mapping_error(orb->base.request_bus))
 427                 goto out;
 428
 429         orb->response_bus =
 430                 dma_map_single(device->card->device, &orb->response,
 431                                sizeof(orb->response), DMA_FROM_DEVICE);
 432         if (dma_mapping_error(orb->response_bus))
 433                 goto out;
 434
 435         orb->request.response.high    = 0;
 436         orb->request.response.low     = orb->response_bus;
 437
 438         orb->request.misc =
 439                 MANAGEMENT_ORB_NOTIFY |
 440                 MANAGEMENT_ORB_FUNCTION(function) |
 441                 MANAGEMENT_ORB_LUN(lun);
 442         orb->request.length =
 443                 MANAGEMENT_ORB_RESPONSE_LENGTH(sizeof(orb->response));
 444
 445         orb->request.status_fifo.high = sd->address_handler.offset >> 32;
 446         orb->request.status_fifo.low  = sd->address_handler.offset;
 447
 448         if (function == SBP2_LOGIN_REQUEST) {
 449                 orb->request.misc |=
 450                         MANAGEMENT_ORB_EXCLUSIVE(sbp2_param_exclusive_login) |
 451                         MANAGEMENT_ORB_RECONNECT(0);
 452         }
 453
 454         fw_memcpy_to_be32(&orb->request, &orb->request, sizeof(orb->request));
 455
 456         init_completion(&orb->done);
 457         orb->base.callback = complete_management_orb;
 458
 459         sbp2_send_orb(&orb->base, unit,
 460                       node_id, generation, sd->management_agent_address);
 461
 462         wait_for_completion_timeout(&orb->done,
 463                                     msecs_to_jiffies(SBP2_ORB_TIMEOUT));
 464
 465         retval = -EIO;
 466         if (sbp2_cancel_orbs(unit) == 0) {
 467                 fw_error("orb reply timed out, rcode=0x%02x\n",
 468                          orb->base.rcode);
 469                 goto out;
 470         }
 471
 472         if (orb->base.rcode != RCODE_COMPLETE) {
 473                 fw_error("management write failed, rcode 0x%02x\n",
 474                          orb->base.rcode);
 475                 goto out;
 476         }
 477
 478         if (STATUS_GET_RESPONSE(orb->status) != 0 ||
 479             STATUS_GET_SBP_STATUS(orb->status) != 0) {
 480                 fw_error("error status: %d:%d\n",
 481                          STATUS_GET_RESPONSE(orb->status),
 482                          STATUS_GET_SBP_STATUS(orb->status));
 483                 goto out;
 484         }
 485
 486         retval = 0;
 487  out:
 488         dma_unmap_single(device->card->device, orb->base.request_bus,
 489                          sizeof(orb->request), DMA_TO_DEVICE);
 490         dma_unmap_single(device->card->device, orb->response_bus,
 491                          sizeof(orb->response), DMA_FROM_DEVICE);
 492
 493         if (response)
 494                 fw_memcpy_from_be32(response,
 495                                     orb->response, sizeof(orb->response));
 496         kfree(orb);
 497
 498         return retval;
 499 }
 500
 501 static void
 502 complete_agent_reset_write(struct fw_card *card, int rcode,
 503                            void *payload, size_t length, void *data)
 504 {
 505         struct fw_transaction *t = data;
 506
 507         kfree(t);
 508 }
 509
 510 static int sbp2_agent_reset(struct fw_unit *unit)
 511 {
 512         struct fw_device *device = fw_device(unit->device.parent);
 513         struct sbp2_device *sd = unit->device.driver_data;
 514         struct fw_transaction *t;
 515         static u32 zero;
 516
 517         t = kzalloc(sizeof(*t), GFP_ATOMIC);
 518         if (t == NULL)
 519                 return -ENOMEM;
 520
 521         fw_send_request(device->card, t, TCODE_WRITE_QUADLET_REQUEST,
 522                         sd->node_id, sd->generation, device->max_speed,
 523                         sd->command_block_agent_address + SBP2_AGENT_RESET,
 524                         &zero, sizeof(zero), complete_agent_reset_write, t);
 525
 526         return 0;
 527 }
 528
 529 static void sbp2_reconnect(struct work_struct *work);
 530 static struct scsi_host_template scsi_driver_template;
 531
 532 static void release_sbp2_device(struct kref *kref)
 533 {
 534         struct sbp2_device *sd = container_of(kref, struct sbp2_device, kref);
 535         struct Scsi_Host *host =
 536                 container_of((void *)sd, struct Scsi_Host, hostdata[0]);
 537
 538         scsi_remove_host(host);
 539         sbp2_send_management_orb(sd->unit, sd->node_id, sd->generation,
 540                                  SBP2_LOGOUT_REQUEST, sd->login_id, NULL);
 541         fw_core_remove_address_handler(&sd->address_handler);
 542         fw_notify("removed sbp2 unit %s\n", sd->unit->device.bus_id);
 543         put_device(&sd->unit->device);
 544         scsi_host_put(host);
 545 }
 546
 547 static void sbp2_login(struct work_struct *work)
 548 {
 549         struct sbp2_device *sd =
 550                 container_of(work, struct sbp2_device, work.work);
 551         struct Scsi_Host *host =
 552                 container_of((void *)sd, struct Scsi_Host, hostdata[0]);
 553         struct fw_unit *unit = sd->unit;
 554         struct fw_device *device = fw_device(unit->device.parent);
 555         struct sbp2_login_response response;
 556         int generation, node_id, local_node_id, lun, retval;
 557
 558         /* FIXME: Make this work for multi-lun devices. */
 559         lun = 0;
 560
 561         generation    = device->card->generation;
 562         node_id       = device->node->node_id;
 563         local_node_id = device->card->local_node->node_id;
 564
 565         if (sbp2_send_management_orb(unit, node_id, generation,
 566                                      SBP2_LOGIN_REQUEST, lun, &response) < 0) {
 567                 if (sd->retries++ < 5) {
 568                         schedule_delayed_work(&sd->work, DIV_ROUND_UP(HZ, 5));
 569                 } else {
 570                         fw_error("failed to login to %s\n",
 571                                  unit->device.bus_id);
 572                         kref_put(&sd->kref, release_sbp2_device);
 573                 }
 574                 return;
 575         }
 576
 577         sd->generation   = generation;
 578         sd->node_id      = node_id;
 579         sd->address_high = local_node_id << 16;
 580
 581         /* Get command block agent offset and login id. */
 582         sd->command_block_agent_address =
 583                 ((u64) (response.command_block_agent.high & 0xffff) << 32) |
 584                 response.command_block_agent.low;
 585         sd->login_id = LOGIN_RESPONSE_GET_LOGIN_ID(response);
 586
 587         fw_notify("logged in to sbp2 unit %s (%d retries)\n",
 588                   unit->device.bus_id, sd->retries);
 589         fw_notify(" - management_agent_address:    0x%012llx\n",
 590                   (unsigned long long) sd->management_agent_address);
 591         fw_notify(" - command_block_agent_address: 0x%012llx\n",
 592                   (unsigned long long) sd->command_block_agent_address);
 593         fw_notify(" - status write address:        0x%012llx\n",
 594                   (unsigned long long) sd->address_handler.offset);
 595
 596 #if 0
 597         /* FIXME: The linux1394 sbp2 does this last step. */
 598         sbp2_set_busy_timeout(scsi_id);
 599 #endif
 600
 601         PREPARE_DELAYED_WORK(&sd->work, sbp2_reconnect);
 602         sbp2_agent_reset(unit);
 603
 604         /* FIXME: Loop over luns here. */
 605         lun = 0;
 606         retval = scsi_add_device(host, 0, 0, lun);
 607         if (retval < 0) {
 608                 sbp2_send_management_orb(unit, sd->node_id, sd->generation,
 609                                          SBP2_LOGOUT_REQUEST, sd->login_id,
 610                                          NULL);
 611                 /*
 612                  * Set this back to sbp2_login so we fall back and
 613                  * retry login on bus reset.
 614                  */
 615                 PREPARE_DELAYED_WORK(&sd->work, sbp2_login);
 616         }
 617         kref_put(&sd->kref, release_sbp2_device);
 618 }
 619
 620 static int sbp2_probe(struct device *dev)
 621 {
 622         struct fw_unit *unit = fw_unit(dev);
 623         struct fw_device *device = fw_device(unit->device.parent);
 624         struct sbp2_device *sd;
 625         struct fw_csr_iterator ci;
 626         struct Scsi_Host *host;
 627         int i, key, value, err;
 628         u32 model, firmware_revision;
 629
 630         err = -ENOMEM;
 631         host = scsi_host_alloc(&scsi_driver_template, sizeof(*sd));
 632         if (host == NULL)
 633                 goto fail;
 634
 635         sd = (struct sbp2_device *) host->hostdata;
 636         unit->device.driver_data = sd;
 637         sd->unit = unit;
 638         INIT_LIST_HEAD(&sd->orb_list);
 639         kref_init(&sd->kref);
 640
 641         sd->address_handler.length = 0x100;
 642         sd->address_handler.address_callback = sbp2_status_write;
 643         sd->address_handler.callback_data = sd;
 644
 645         err = fw_core_add_address_handler(&sd->address_handler,
 646                                           &fw_high_memory_region);
 647         if (err < 0)
 648                 goto fail_host;
 649
 650         err = fw_device_enable_phys_dma(device);
 651         if (err < 0)
 652                 goto fail_address_handler;
 653
 654         err = scsi_add_host(host, &unit->device);
 655         if (err < 0)
 656                 goto fail_address_handler;
 657
 658         /*
 659          * Scan unit directory to get management agent address,
 660          * firmware revison and model.  Initialize firmware_revision
 661          * and model to values that wont match anything in our table.
 662          */
 663         firmware_revision = 0xff000000;
 664         model = 0xff000000;
 665         fw_csr_iterator_init(&ci, unit->directory);
 666         while (fw_csr_iterator_next(&ci, &key, &value)) {
 667                 switch (key) {
 668                 case CSR_DEPENDENT_INFO | CSR_OFFSET:
 669                         sd->management_agent_address =
 670                                 0xfffff0000000ULL + 4 * value;
 671                         break;
 672                 case SBP2_FIRMWARE_REVISION:
 673                         firmware_revision = value;
 674                         break;
 675                 case CSR_MODEL:
 676                         model = value;
 677                         break;
 678                 }
 679         }
 680
 681         for (i = 0; i < ARRAY_SIZE(sbp2_workarounds_table); i++) {
 682                 if (sbp2_workarounds_table[i].firmware_revision !=
 683                     (firmware_revision & 0xffffff00))
 684                         continue;
 685                 if (sbp2_workarounds_table[i].model != model &&
 686                     sbp2_workarounds_table[i].model != ~0)
 687                         continue;
 688                 sd->workarounds |= sbp2_workarounds_table[i].workarounds;
 689                 break;
 690         }
 691
 692         if (sd->workarounds)
 693                 fw_notify("Workarounds for node %s: 0x%x "
 694                           "(firmware_revision 0x%06x, model_id 0x%06x)\n",
 695                           unit->device.bus_id,
 696                           sd->workarounds, firmware_revision, model);
 697
 698         get_device(&unit->device);
 699
 700         /*
 701          * We schedule work to do the login so we can easily
 702          * reschedule retries. Always get the ref before scheduling
 703          * work.
 704          */
 705         INIT_DELAYED_WORK(&sd->work, sbp2_login);
 706         if (schedule_delayed_work(&sd->work, 0))
 707                 kref_get(&sd->kref);
 708
 709         return 0;
 710
 711  fail_address_handler:
 712         fw_core_remove_address_handler(&sd->address_handler);
 713  fail_host:
 714         scsi_host_put(host);
 715  fail:
 716         return err;
 717 }
 718
 719 static int sbp2_remove(struct device *dev)
 720 {
 721         struct fw_unit *unit = fw_unit(dev);
 722         struct sbp2_device *sd = unit->device.driver_data;
 723
 724         kref_put(&sd->kref, release_sbp2_device);
 725
 726         return 0;
 727 }
 728
 729 static void sbp2_reconnect(struct work_struct *work)
 730 {
 731         struct sbp2_device *sd =
 732                 container_of(work, struct sbp2_device, work.work);
 733         struct fw_unit *unit = sd->unit;
 734         struct fw_device *device = fw_device(unit->device.parent);
 735         int generation, node_id, local_node_id;
 736
 737         generation    = device->card->generation;
 738         node_id       = device->node->node_id;
 739         local_node_id = device->card->local_node->node_id;
 740
 741         if (sbp2_send_management_orb(unit, node_id, generation,
 742                                      SBP2_RECONNECT_REQUEST,
 743                                      sd->login_id, NULL) < 0) {
 744                 if (sd->retries++ >= 5) {
 745                         fw_error("failed to reconnect to %s\n",
 746                                  unit->device.bus_id);
 747                         /* Fall back and try to log in again. */
 748                         sd->retries = 0;
 749                         PREPARE_DELAYED_WORK(&sd->work, sbp2_login);
 750                 }
 751                 schedule_delayed_work(&sd->work, DIV_ROUND_UP(HZ, 5));
 752                 return;
 753         }
 754
 755         sd->generation   = generation;
 756         sd->node_id      = node_id;
 757         sd->address_high = local_node_id << 16;
 758
 759         fw_notify("reconnected to unit %s (%d retries)\n",
 760                   unit->device.bus_id, sd->retries);
 761         sbp2_agent_reset(unit);
 762         sbp2_cancel_orbs(unit);
 763         kref_put(&sd->kref, release_sbp2_device);
 764 }
 765
 766 static void sbp2_update(struct fw_unit *unit)
 767 {
 768         struct fw_device *device = fw_device(unit->device.parent);
 769         struct sbp2_device *sd = unit->device.driver_data;
 770
 771         sd->retries = 0;
 772         fw_device_enable_phys_dma(device);
 773         if (schedule_delayed_work(&sd->work, 0))
 774                 kref_get(&sd->kref);
 775 }
 776
 777 #define SBP2_UNIT_SPEC_ID_ENTRY 0x0000609e
 778 #define SBP2_SW_VERSION_ENTRY   0x00010483
 779
 780 static const struct fw_device_id sbp2_id_table[] = {
 781         {
 782                 .match_flags  = FW_MATCH_SPECIFIER_ID | FW_MATCH_VERSION,
 783                 .specifier_id = SBP2_UNIT_SPEC_ID_ENTRY,
 784                 .version      = SBP2_SW_VERSION_ENTRY,
 785         },
 786         { }
 787 };
 788
 789 static struct fw_driver sbp2_driver = {
 790         .driver   = {
 791                 .owner  = THIS_MODULE,
 792                 .name   = sbp2_driver_name,
 793                 .bus    = &fw_bus_type,
 794                 .probe  = sbp2_probe,
 795                 .remove = sbp2_remove,
 796         },
 797         .update   = sbp2_update,
 798         .id_table = sbp2_id_table,
 799 };
 800
 801 static unsigned int
 802 sbp2_status_to_sense_data(u8 *sbp2_status, u8 *sense_data)
 803 {
 804         int sam_status;
 805
 806         sense_data[0] = 0x70;
 807         sense_data[1] = 0x0;
 808         sense_data[2] = sbp2_status[1];
 809         sense_data[3] = sbp2_status[4];
 810         sense_data[4] = sbp2_status[5];
 811         sense_data[5] = sbp2_status[6];
 812         sense_data[6] = sbp2_status[7];
 813         sense_data[7] = 10;
 814         sense_data[8] = sbp2_status[8];
 815         sense_data[9] = sbp2_status[9];
 816         sense_data[10] = sbp2_status[10];
 817         sense_data[11] = sbp2_status[11];
 818         sense_data[12] = sbp2_status[2];
 819         sense_data[13] = sbp2_status[3];
 820         sense_data[14] = sbp2_status[12];
 821         sense_data[15] = sbp2_status[13];
 822
 823         sam_status = sbp2_status[0] & 0x3f;
 824
 825         switch (sam_status) {
 826         case SAM_STAT_GOOD:
 827         case SAM_STAT_CHECK_CONDITION:
 828         case SAM_STAT_CONDITION_MET:
 829         case SAM_STAT_BUSY:
 830         case SAM_STAT_RESERVATION_CONFLICT:
 831         case SAM_STAT_COMMAND_TERMINATED:
 832                 return DID_OK << 16 | sam_status;
 833
 834         default:
 835                 return DID_ERROR << 16;
 836         }
 837 }
 838
 839 static void
 840 complete_command_orb(struct sbp2_orb *base_orb, struct sbp2_status *status)
 841 {
 842         struct sbp2_command_orb *orb =
 843                 container_of(base_orb, struct sbp2_command_orb, base);
 844         struct fw_unit *unit = orb->unit;
 845         struct fw_device *device = fw_device(unit->device.parent);
 846         struct scatterlist *sg;
 847         int result;
 848
 849         if (status != NULL) {
 850                 if (STATUS_GET_DEAD(*status))
 851                         sbp2_agent_reset(unit);
 852
 853                 switch (STATUS_GET_RESPONSE(*status)) {
 854                 case SBP2_STATUS_REQUEST_COMPLETE:
 855                         result = DID_OK << 16;
 856                         break;
 857                 case SBP2_STATUS_TRANSPORT_FAILURE:
 858                         result = DID_BUS_BUSY << 16;
 859                         break;
 860                 case SBP2_STATUS_ILLEGAL_REQUEST:
 861                 case SBP2_STATUS_VENDOR_DEPENDENT:
 862                 default:
 863                         result = DID_ERROR << 16;
 864                         break;
 865                 }
 866
 867                 if (result == DID_OK << 16 && STATUS_GET_LEN(*status) > 1)
 868                         result = sbp2_status_to_sense_data(STATUS_GET_DATA(*status),
 869                                                            orb->cmd->sense_buffer);
 870         } else {
 871                 /*
 872                  * If the orb completes with status == NULL, something
 873                  * went wrong, typically a bus reset happened mid-orb
 874                  * or when sending the write (less likely).
 875                  */
 876                 result = DID_BUS_BUSY << 16;
 877         }
 878
 879         dma_unmap_single(device->card->device, orb->base.request_bus,
 880                          sizeof(orb->request), DMA_TO_DEVICE);
 881
 882         if (orb->cmd->use_sg > 0) {
 883                 sg = (struct scatterlist *)orb->cmd->request_buffer;
 884                 dma_unmap_sg(device->card->device, sg, orb->cmd->use_sg,
 885                              orb->cmd->sc_data_direction);
 886         }
 887
 888         if (orb->page_table_bus != 0)
 889                 dma_unmap_single(device->card->device, orb->page_table_bus,
 890                                  sizeof(orb->page_table), DMA_TO_DEVICE);
 891
 892         orb->cmd->result = result;
 893         orb->done(orb->cmd);
 894         kfree(orb);
 895 }
 896
 897 static int sbp2_command_orb_map_scatterlist(struct sbp2_command_orb *orb)
 898 {
 899         struct sbp2_device *sd =
 900                 (struct sbp2_device *)orb->cmd->device->host->hostdata;
 901         struct fw_unit *unit = sd->unit;
 902         struct fw_device *device = fw_device(unit->device.parent);
 903         struct scatterlist *sg;
 904         int sg_len, l, i, j, count;
 905         dma_addr_t sg_addr;
 906
 907         sg = (struct scatterlist *)orb->cmd->request_buffer;
 908         count = dma_map_sg(device->card->device, sg, orb->cmd->use_sg,
 909                            orb->cmd->sc_data_direction);
 910         if (count == 0)
 911                 goto fail;
 912
 913         /*
 914          * Handle the special case where there is only one element in
 915          * the scatter list by converting it to an immediate block
 916          * request. This is also a workaround for broken devices such
 917          * as the second generation iPod which doesn't support page
 918          * tables.
 919          */
 920         if (count == 1 && sg_dma_len(sg) < SBP2_MAX_SG_ELEMENT_LENGTH) {
 921                 orb->request.data_descriptor.high = sd->address_high;
 922                 orb->request.data_descriptor.low  = sg_dma_address(sg);
 923                 orb->request.misc |=
 924                         COMMAND_ORB_DATA_SIZE(sg_dma_len(sg));
 925                 return 0;
 926         }
 927
 928         /*
 929          * Convert the scatterlist to an sbp2 page table.  If any
 930          * scatterlist entries are too big for sbp2, we split them as we
 931          * go.  Even if we ask the block I/O layer to not give us sg
 932          * elements larger than 65535 bytes, some IOMMUs may merge sg elements
 933          * during DMA mapping, and Linux currently doesn't prevent this.
 934          */
 935         for (i = 0, j = 0; i < count; i++) {
 936                 sg_len = sg_dma_len(sg + i);
 937                 sg_addr = sg_dma_address(sg + i);
 938                 while (sg_len) {
 939                         /* FIXME: This won't get us out of the pinch. */
 940                         if (unlikely(j >= ARRAY_SIZE(orb->page_table))) {
 941                                 fw_error("page table overflow\n");
 942                                 goto fail_page_table;
 943                         }
 944                         l = min(sg_len, SBP2_MAX_SG_ELEMENT_LENGTH);
 945                         orb->page_table[j].low = sg_addr;
 946                         orb->page_table[j].high = (l << 16);
 947                         sg_addr += l;
 948                         sg_len -= l;
 949                         j++;
 950                 }
 951         }
 952
 953         fw_memcpy_to_be32(orb->page_table, orb->page_table,
 954                           sizeof(orb->page_table[0]) * j);
 955         orb->page_table_bus =
 956                 dma_map_single(device->card->device, orb->page_table,
 957                                sizeof(orb->page_table), DMA_TO_DEVICE);
 958         if (dma_mapping_error(orb->page_table_bus))
 959                 goto fail_page_table;
 960
 961         /*
 962          * The data_descriptor pointer is the one case where we need
 963          * to fill in the node ID part of the address.  All other
 964          * pointers assume that the data referenced reside on the
 965          * initiator (i.e. us), but data_descriptor can refer to data
 966          * on other nodes so we need to put our ID in descriptor.high.
 967          */
 968         orb->request.data_descriptor.high = sd->address_high;
 969         orb->request.data_descriptor.low  = orb->page_table_bus;
 970         orb->request.misc |=
 971                 COMMAND_ORB_PAGE_TABLE_PRESENT |
 972                 COMMAND_ORB_DATA_SIZE(j);
 973
 974         return 0;
 975
 976  fail_page_table:
 977         dma_unmap_sg(device->card->device, sg, orb->cmd->use_sg,
 978                      orb->cmd->sc_data_direction);
 979  fail:
 980         return -ENOMEM;
 981 }
 982
 983 /* SCSI stack integration */
 984
 985 static int sbp2_scsi_queuecommand(struct scsi_cmnd *cmd, scsi_done_fn_t done)
 986 {
 987         struct sbp2_device *sd =
 988                 (struct sbp2_device *)cmd->device->host->hostdata;
 989         struct fw_unit *unit = sd->unit;
 990         struct fw_device *device = fw_device(unit->device.parent);
 991         struct sbp2_command_orb *orb;
 992
 993         /*
 994          * Bidirectional commands are not yet implemented, and unknown
 995          * transfer direction not handled.
 996          */
 997         if (cmd->sc_data_direction == DMA_BIDIRECTIONAL) {
 998                 fw_error("Can't handle DMA_BIDIRECTIONAL, rejecting command\n");
 999                 cmd->result = DID_ERROR << 16;
1000                 done(cmd);
1001                 return 0;
1002         }
1003
1004         orb = kzalloc(sizeof(*orb), GFP_ATOMIC);
1005         if (orb == NULL) {
1006                 fw_notify("failed to alloc orb\n");
1007                 goto fail_alloc;
1008         }
1009
1010         /* Initialize rcode to something not RCODE_COMPLETE. */
1011         orb->base.rcode = -1;
1012
1013         orb->unit = unit;
1014         orb->done = done;
1015         orb->cmd  = cmd;
1016
1017         orb->request.next.high   = SBP2_ORB_NULL;
1018         orb->request.next.low    = 0x0;
1019         /*
1020          * At speed 100 we can do 512 bytes per packet, at speed 200,
1021          * 1024 bytes per packet etc.  The SBP-2 max_payload field
1022          * specifies the max payload size as 2 ^ (max_payload + 2), so
1023          * if we set this to max_speed + 7, we get the right value.
1024          */
1025         orb->request.misc =
1026                 COMMAND_ORB_MAX_PAYLOAD(device->max_speed + 7) |
1027                 COMMAND_ORB_SPEED(device->max_speed) |
1028                 COMMAND_ORB_NOTIFY;
1029
1030         if (cmd->sc_data_direction == DMA_FROM_DEVICE)
1031                 orb->request.misc |=
1032                         COMMAND_ORB_DIRECTION(SBP2_DIRECTION_FROM_MEDIA);
1033         else if (cmd->sc_data_direction == DMA_TO_DEVICE)
1034                 orb->request.misc |=
1035                         COMMAND_ORB_DIRECTION(SBP2_DIRECTION_TO_MEDIA);
1036
1037         if (cmd->use_sg && sbp2_command_orb_map_scatterlist(orb) < 0)
1038                 goto fail_mapping;
1039
1040         fw_memcpy_to_be32(&orb->request, &orb->request, sizeof(orb->request));
1041
1042         memset(orb->request.command_block,
1043                0, sizeof(orb->request.command_block));
1044         memcpy(orb->request.command_block, cmd->cmnd, COMMAND_SIZE(*cmd->cmnd));
1045
1046         orb->base.callback = complete_command_orb;
1047         orb->base.request_bus =
1048                 dma_map_single(device->card->device, &orb->request,
1049                                sizeof(orb->request), DMA_TO_DEVICE);
1050         if (dma_mapping_error(orb->base.request_bus))
1051                 goto fail_mapping;
1052
1053         sbp2_send_orb(&orb->base, unit, sd->node_id, sd->generation,
1054                       sd->command_block_agent_address + SBP2_ORB_POINTER);
1055
1056         return 0;
1057
1058  fail_mapping:
1059         kfree(orb);
1060  fail_alloc:
1061         return SCSI_MLQUEUE_HOST_BUSY;
1062 }
1063
1064 static int sbp2_scsi_slave_alloc(struct scsi_device *sdev)
1065 {
1066         struct sbp2_device *sd = (struct sbp2_device *)sdev->host->hostdata;
1067
1068         sdev->allow_restart = 1;
1069
1070         if (sd->workarounds & SBP2_WORKAROUND_INQUIRY_36)
1071                 sdev->inquiry_len = 36;
1072         return 0;
1073 }
1074
1075 static int sbp2_scsi_slave_configure(struct scsi_device *sdev)
1076 {
1077         struct sbp2_device *sd = (struct sbp2_device *)sdev->host->hostdata;
1078         struct fw_unit *unit = sd->unit;
1079
1080         sdev->use_10_for_rw = 1;
1081
1082         if (sdev->type == TYPE_ROM)
1083                 sdev->use_10_for_ms = 1;
1084         if (sdev->type == TYPE_DISK &&
1085             sd->workarounds & SBP2_WORKAROUND_MODE_SENSE_8)
1086                 sdev->skip_ms_page_8 = 1;
1087         if (sd->workarounds & SBP2_WORKAROUND_FIX_CAPACITY) {
1088                 fw_notify("setting fix_capacity for %s\n", unit->device.bus_id);
1089                 sdev->fix_capacity = 1;
1090         }
1091         if (sd->workarounds & SBP2_WORKAROUND_128K_MAX_TRANS)
1092                 blk_queue_max_sectors(sdev->request_queue, 128 * 1024 / 512);
1093         return 0;
1094 }
1095
1096 /*
1097  * Called by scsi stack when something has really gone wrong.  Usually
1098  * called when a command has timed-out for some reason.
1099  */
1100 static int sbp2_scsi_abort(struct scsi_cmnd *cmd)
1101 {
1102         struct sbp2_device *sd =
1103                 (struct sbp2_device *)cmd->device->host->hostdata;
1104         struct fw_unit *unit = sd->unit;
1105
1106         fw_notify("sbp2_scsi_abort\n");
1107         sbp2_agent_reset(unit);
1108         sbp2_cancel_orbs(unit);
1109
1110         return SUCCESS;
1111 }
1112
1113 /*
1114  * Format of /sys/bus/scsi/devices/.../ieee1394_id:
1115  * u64 EUI-64 : u24 directory_ID : u16 LUN  (all printed in hexadecimal)
1116  *
1117  * This is the concatenation of target port identifier and logical unit
1118  * identifier as per SAM-2...SAM-4 annex A.
1119  */
1120 static ssize_t
1121 sbp2_sysfs_ieee1394_id_show(struct device *dev, struct device_attribute *attr,
1122                             char *buf)
1123 {
1124         struct scsi_device *sdev = to_scsi_device(dev);
1125         struct sbp2_device *sd;
1126         struct fw_unit *unit;
1127         struct fw_device *device;
1128         u32 directory_id;
1129         struct fw_csr_iterator ci;
1130         int key, value, lun;
1131
1132         if (!sdev)
1133                 return 0;
1134         sd = (struct sbp2_device *)sdev->host->hostdata;
1135         unit = sd->unit;
1136         device = fw_device(unit->device.parent);
1137
1138         /* implicit directory ID */
1139         directory_id = ((unit->directory - device->config_rom) * 4
1140                         + CSR_CONFIG_ROM) & 0xffffff;
1141
1142         /* explicit directory ID, overrides implicit ID if present */
1143         fw_csr_iterator_init(&ci, unit->directory);
1144         while (fw_csr_iterator_next(&ci, &key, &value))
1145                 if (key == CSR_DIRECTORY_ID) {
1146                         directory_id = value;
1147                         break;
1148                 }
1149
1150         /* FIXME: Make this work for multi-lun devices. */
1151         lun = 0;
1152
1153         return sprintf(buf, "%08x%08x:%06x:%04x\n",
1154                         device->config_rom[3], device->config_rom[4],
1155                         directory_id, lun);
1156 }
1157
1158 static DEVICE_ATTR(ieee1394_id, S_IRUGO, sbp2_sysfs_ieee1394_id_show, NULL);
1159
1160 static struct device_attribute *sbp2_scsi_sysfs_attrs[] = {
1161         &dev_attr_ieee1394_id,
1162         NULL
1163 };
1164
1165 static struct scsi_host_template scsi_driver_template = {
1166         .module                 = THIS_MODULE,
1167         .name                   = "SBP-2 IEEE-1394",
1168         .proc_name              = (char *)sbp2_driver_name,
1169         .queuecommand           = sbp2_scsi_queuecommand,
1170         .slave_alloc            = sbp2_scsi_slave_alloc,
1171         .slave_configure        = sbp2_scsi_slave_configure,
1172         .eh_abort_handler       = sbp2_scsi_abort,
1173         .this_id                = -1,
1174         .sg_tablesize           = SG_ALL,
1175         .use_clustering         = ENABLE_CLUSTERING,
1176         .cmd_per_lun            = 1,
1177         .can_queue              = 1,
1178         .sdev_attrs             = sbp2_scsi_sysfs_attrs,
1179 };
1180
1181 MODULE_AUTHOR("Kristian Hoegsberg <krh@bitplanet.net>");
1182 MODULE_DESCRIPTION("SCSI over IEEE1394");
1183 MODULE_LICENSE("GPL");
1184 MODULE_DEVICE_TABLE(ieee1394, sbp2_id_table);
1185
1186 /* Provide a module alias so root-on-sbp2 initrds don't break. */
1187 #ifndef CONFIG_IEEE1394_SBP2_MODULE
1188 MODULE_ALIAS("sbp2");
1189 #endif
1190
1191 static int __init sbp2_init(void)
1192 {
1193         return driver_register(&sbp2_driver.driver);
1194 }
1195
1196 static void __exit sbp2_cleanup(void)
1197 {
1198         driver_unregister(&sbp2_driver.driver);
1199 }
1200
1201 module_init(sbp2_init);
1202 module_exit(sbp2_cleanup);