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   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/mod_devicetable.h>
  34 #include <linux/device.h>
  35 #include <linux/scatterlist.h>
  36 #include <linux/dma-mapping.h>
  37 #include <linux/timer.h>
  38
  39 #include <scsi/scsi.h>
  40 #include <scsi/scsi_cmnd.h>
  41 #include <scsi/scsi_dbg.h>
  42 #include <scsi/scsi_device.h>
  43 #include <scsi/scsi_host.h>
  44
  45 #include "fw-transaction.h"
  46 #include "fw-topology.h"
  47 #include "fw-device.h"
  48
  49 /* I don't know why the SCSI stack doesn't define something like this... */
  50 typedef void (*scsi_done_fn_t)(struct scsi_cmnd *);
  51
  52 static const char sbp2_driver_name[] = "sbp2";
  53
  54 struct sbp2_device {
  55         struct kref kref;
  56         struct fw_unit *unit;
  57         struct fw_address_handler address_handler;
  58         struct list_head orb_list;
  59         u64 management_agent_address;
  60         u64 command_block_agent_address;
  61         u32 workarounds;
  62         int login_id;
  63
  64         /*
  65          * We cache these addresses and only update them once we've
  66          * logged in or reconnected to the sbp2 device.  That way, any
  67          * IO to the device will automatically fail and get retried if
  68          * it happens in a window where the device is not ready to
  69          * handle it (e.g. after a bus reset but before we reconnect).
  70          */
  71         int node_id;
  72         int address_high;
  73         int generation;
  74
  75         int retries;
  76         struct delayed_work work;
  77 };
  78
  79 #define SBP2_MAX_SG_ELEMENT_LENGTH      0xf000
  80 #define SBP2_MAX_SECTORS                255     /* Max sectors supported */
  81 #define SBP2_ORB_TIMEOUT                2000    /* Timeout in ms */
  82
  83 #define SBP2_ORB_NULL                   0x80000000
  84
  85 #define SBP2_DIRECTION_TO_MEDIA         0x0
  86 #define SBP2_DIRECTION_FROM_MEDIA       0x1
  87
  88 /* Unit directory keys */
  89 #define SBP2_COMMAND_SET_SPECIFIER      0x38
  90 #define SBP2_COMMAND_SET                0x39
  91 #define SBP2_COMMAND_SET_REVISION       0x3b
  92 #define SBP2_FIRMWARE_REVISION          0x3c
  93
  94 /* Flags for detected oddities and brokeness */
  95 #define SBP2_WORKAROUND_128K_MAX_TRANS  0x1
  96 #define SBP2_WORKAROUND_INQUIRY_36      0x2
  97 #define SBP2_WORKAROUND_MODE_SENSE_8    0x4
  98 #define SBP2_WORKAROUND_FIX_CAPACITY    0x8
  99 #define SBP2_WORKAROUND_OVERRIDE        0x100
 100
 101 /* Management orb opcodes */
 102 #define SBP2_LOGIN_REQUEST              0x0
 103 #define SBP2_QUERY_LOGINS_REQUEST       0x1
 104 #define SBP2_RECONNECT_REQUEST          0x3
 105 #define SBP2_SET_PASSWORD_REQUEST       0x4
 106 #define SBP2_LOGOUT_REQUEST             0x7
 107 #define SBP2_ABORT_TASK_REQUEST         0xb
 108 #define SBP2_ABORT_TASK_SET             0xc
 109 #define SBP2_LOGICAL_UNIT_RESET         0xe
 110 #define SBP2_TARGET_RESET_REQUEST       0xf
 111
 112 /* Offsets for command block agent registers */
 113 #define SBP2_AGENT_STATE                0x00
 114 #define SBP2_AGENT_RESET                0x04
 115 #define SBP2_ORB_POINTER                0x08
 116 #define SBP2_DOORBELL                   0x10
 117 #define SBP2_UNSOLICITED_STATUS_ENABLE  0x14
 118
 119 /* Status write response codes */
 120 #define SBP2_STATUS_REQUEST_COMPLETE    0x0
 121 #define SBP2_STATUS_TRANSPORT_FAILURE   0x1
 122 #define SBP2_STATUS_ILLEGAL_REQUEST     0x2
 123 #define SBP2_STATUS_VENDOR_DEPENDENT    0x3
 124
 125 #define STATUS_GET_ORB_HIGH(v)          ((v).status & 0xffff)
 126 #define STATUS_GET_SBP_STATUS(v)        (((v).status >> 16) & 0xff)
 127 #define STATUS_GET_LEN(v)               (((v).status >> 24) & 0x07)
 128 #define STATUS_GET_DEAD(v)              (((v).status >> 27) & 0x01)
 129 #define STATUS_GET_RESPONSE(v)          (((v).status >> 28) & 0x03)
 130 #define STATUS_GET_SOURCE(v)            (((v).status >> 30) & 0x03)
 131 #define STATUS_GET_ORB_LOW(v)           ((v).orb_low)
 132 #define STATUS_GET_DATA(v)              ((v).data)
 133
 134 struct sbp2_status {
 135         u32 status;
 136         u32 orb_low;
 137         u8 data[24];
 138 };
 139
 140 struct sbp2_pointer {
 141         u32 high;
 142         u32 low;
 143 };
 144
 145 struct sbp2_orb {
 146         struct fw_transaction t;
 147         dma_addr_t request_bus;
 148         int rcode;
 149         struct sbp2_pointer pointer;
 150         void (*callback)(struct sbp2_orb * orb, struct sbp2_status * status);
 151         struct list_head link;
 152 };
 153
 154 #define MANAGEMENT_ORB_LUN(v)                   ((v))
 155 #define MANAGEMENT_ORB_FUNCTION(v)              ((v) << 16)
 156 #define MANAGEMENT_ORB_RECONNECT(v)             ((v) << 20)
 157 #define MANAGEMENT_ORB_EXCLUSIVE                ((1) << 28)
 158 #define MANAGEMENT_ORB_REQUEST_FORMAT(v)        ((v) << 29)
 159 #define MANAGEMENT_ORB_NOTIFY                   ((1) << 31)
 160
 161 #define MANAGEMENT_ORB_RESPONSE_LENGTH(v)       ((v))
 162 #define MANAGEMENT_ORB_PASSWORD_LENGTH(v)       ((v) << 16)
 163
 164 struct sbp2_management_orb {
 165         struct sbp2_orb base;
 166         struct {
 167                 struct sbp2_pointer password;
 168                 struct sbp2_pointer response;
 169                 u32 misc;
 170                 u32 length;
 171                 struct sbp2_pointer status_fifo;
 172         } request;
 173         __be32 response[4];
 174         dma_addr_t response_bus;
 175         struct completion done;
 176         struct sbp2_status status;
 177 };
 178
 179 #define LOGIN_RESPONSE_GET_LOGIN_ID(v)  ((v).misc & 0xffff)
 180 #define LOGIN_RESPONSE_GET_LENGTH(v)    (((v).misc >> 16) & 0xffff)
 181
 182 struct sbp2_login_response {
 183         u32 misc;
 184         struct sbp2_pointer command_block_agent;
 185         u32 reconnect_hold;
 186 };
 187 #define COMMAND_ORB_DATA_SIZE(v)        ((v))
 188 #define COMMAND_ORB_PAGE_SIZE(v)        ((v) << 16)
 189 #define COMMAND_ORB_PAGE_TABLE_PRESENT  ((1) << 19)
 190 #define COMMAND_ORB_MAX_PAYLOAD(v)      ((v) << 20)
 191 #define COMMAND_ORB_SPEED(v)            ((v) << 24)
 192 #define COMMAND_ORB_DIRECTION(v)        ((v) << 27)
 193 #define COMMAND_ORB_REQUEST_FORMAT(v)   ((v) << 29)
 194 #define COMMAND_ORB_NOTIFY              ((1) << 31)
 195
 196 struct sbp2_command_orb {
 197         struct sbp2_orb base;
 198         struct {
 199                 struct sbp2_pointer next;
 200                 struct sbp2_pointer data_descriptor;
 201                 u32 misc;
 202                 u8 command_block[12];
 203         } request;
 204         struct scsi_cmnd *cmd;
 205         scsi_done_fn_t done;
 206         struct fw_unit *unit;
 207
 208         struct sbp2_pointer page_table[SG_ALL];
 209         dma_addr_t page_table_bus;
 210 };
 211
 212 /*
 213  * List of devices with known bugs.
 214  *
 215  * The firmware_revision field, masked with 0xffff00, is the best
 216  * indicator for the type of bridge chip of a device.  It yields a few
 217  * false positives but this did not break correctly behaving devices
 218  * so far.  We use ~0 as a wildcard, since the 24 bit values we get
 219  * from the config rom can never match that.
 220  */
 221 static const struct {
 222         u32 firmware_revision;
 223         u32 model;
 224         unsigned workarounds;
 225 } sbp2_workarounds_table[] = {
 226         /* DViCO Momobay CX-1 with TSB42AA9 bridge */ {
 227                 .firmware_revision      = 0x002800,
 228                 .model                  = 0x001010,
 229                 .workarounds            = SBP2_WORKAROUND_INQUIRY_36 |
 230                                           SBP2_WORKAROUND_MODE_SENSE_8,
 231         },
 232         /* Initio bridges, actually only needed for some older ones */ {
 233                 .firmware_revision      = 0x000200,
 234                 .model                  = ~0,
 235                 .workarounds            = SBP2_WORKAROUND_INQUIRY_36,
 236         },
 237         /* Symbios bridge */ {
 238                 .firmware_revision      = 0xa0b800,
 239                 .model                  = ~0,
 240                 .workarounds            = SBP2_WORKAROUND_128K_MAX_TRANS,
 241         },
 242
 243         /*
 244          * There are iPods (2nd gen, 3rd gen) with model_id == 0, but
 245          * these iPods do not feature the read_capacity bug according
 246          * to one report.  Read_capacity behaviour as well as model_id
 247          * could change due to Apple-supplied firmware updates though.
 248          */
 249
 250         /* iPod 4th generation. */ {
 251                 .firmware_revision      = 0x0a2700,
 252                 .model                  = 0x000021,
 253                 .workarounds            = SBP2_WORKAROUND_FIX_CAPACITY,
 254         },
 255         /* iPod mini */ {
 256                 .firmware_revision      = 0x0a2700,
 257                 .model                  = 0x000023,
 258                 .workarounds            = SBP2_WORKAROUND_FIX_CAPACITY,
 259         },
 260         /* iPod Photo */ {
 261                 .firmware_revision      = 0x0a2700,
 262                 .model                  = 0x00007e,
 263                 .workarounds            = SBP2_WORKAROUND_FIX_CAPACITY,
 264         }
 265 };
 266
 267 static void
 268 sbp2_status_write(struct fw_card *card, struct fw_request *request,
 269                   int tcode, int destination, int source,
 270                   int generation, int speed,
 271                   unsigned long long offset,
 272                   void *payload, size_t length, void *callback_data)
 273 {
 274         struct sbp2_device *sd = callback_data;
 275         struct sbp2_orb *orb;
 276         struct sbp2_status status;
 277         size_t header_size;
 278         unsigned long flags;
 279
 280         if (tcode != TCODE_WRITE_BLOCK_REQUEST ||
 281             length == 0 || length > sizeof(status)) {
 282                 fw_send_response(card, request, RCODE_TYPE_ERROR);
 283                 return;
 284         }
 285
 286         header_size = min(length, 2 * sizeof(u32));
 287         fw_memcpy_from_be32(&status, payload, header_size);
 288         if (length > header_size)
 289                 memcpy(status.data, payload + 8, length - header_size);
 290         if (STATUS_GET_SOURCE(status) == 2 || STATUS_GET_SOURCE(status) == 3) {
 291                 fw_notify("non-orb related status write, not handled\n");
 292                 fw_send_response(card, request, RCODE_COMPLETE);
 293                 return;
 294         }
 295
 296         /* Lookup the orb corresponding to this status write. */
 297         spin_lock_irqsave(&card->lock, flags);
 298         list_for_each_entry(orb, &sd->orb_list, link) {
 299                 if (STATUS_GET_ORB_HIGH(status) == 0 &&
 300                     STATUS_GET_ORB_LOW(status) == orb->request_bus &&
 301                     orb->rcode == RCODE_COMPLETE) {
 302                         list_del(&orb->link);
 303                         break;
 304                 }
 305         }
 306         spin_unlock_irqrestore(&card->lock, flags);
 307
 308         if (&orb->link != &sd->orb_list)
 309                 orb->callback(orb, &status);
 310         else
 311                 fw_error("status write for unknown orb\n");
 312
 313         fw_send_response(card, request, RCODE_COMPLETE);
 314 }
 315
 316 static void
 317 complete_transaction(struct fw_card *card, int rcode,
 318                      void *payload, size_t length, void *data)
 319 {
 320         struct sbp2_orb *orb = data;
 321         unsigned long flags;
 322
 323         orb->rcode = rcode;
 324         if (rcode != RCODE_COMPLETE) {
 325                 spin_lock_irqsave(&card->lock, flags);
 326                 list_del(&orb->link);
 327                 spin_unlock_irqrestore(&card->lock, flags);
 328                 orb->callback(orb, NULL);
 329         }
 330 }
 331
 332 static void
 333 sbp2_send_orb(struct sbp2_orb *orb, struct fw_unit *unit,
 334               int node_id, int generation, u64 offset)
 335 {
 336         struct fw_device *device = fw_device(unit->device.parent);
 337         struct sbp2_device *sd = unit->device.driver_data;
 338         unsigned long flags;
 339
 340         orb->pointer.high = 0;
 341         orb->pointer.low = orb->request_bus;
 342         fw_memcpy_to_be32(&orb->pointer, &orb->pointer, sizeof(orb->pointer));
 343
 344         spin_lock_irqsave(&device->card->lock, flags);
 345         list_add_tail(&orb->link, &sd->orb_list);
 346         spin_unlock_irqrestore(&device->card->lock, flags);
 347
 348         fw_send_request(device->card, &orb->t, TCODE_WRITE_BLOCK_REQUEST,
 349                         node_id, generation,
 350                         device->node->max_speed, offset,
 351                         &orb->pointer, sizeof(orb->pointer),
 352                         complete_transaction, orb);
 353 }
 354
 355 static int sbp2_cancel_orbs(struct fw_unit *unit)
 356 {
 357         struct fw_device *device = fw_device(unit->device.parent);
 358         struct sbp2_device *sd = unit->device.driver_data;
 359         struct sbp2_orb *orb, *next;
 360         struct list_head list;
 361         unsigned long flags;
 362         int retval = -ENOENT;
 363
 364         INIT_LIST_HEAD(&list);
 365         spin_lock_irqsave(&device->card->lock, flags);
 366         list_splice_init(&sd->orb_list, &list);
 367         spin_unlock_irqrestore(&device->card->lock, flags);
 368
 369         list_for_each_entry_safe(orb, next, &list, link) {
 370                 retval = 0;
 371                 if (fw_cancel_transaction(device->card, &orb->t) == 0)
 372                         continue;
 373
 374                 orb->rcode = RCODE_CANCELLED;
 375                 orb->callback(orb, NULL);
 376         }
 377
 378         return retval;
 379 }
 380
 381 static void
 382 complete_management_orb(struct sbp2_orb *base_orb, struct sbp2_status *status)
 383 {
 384         struct sbp2_management_orb *orb =
 385             (struct sbp2_management_orb *)base_orb;
 386
 387         if (status)
 388                 memcpy(&orb->status, status, sizeof(*status));
 389         complete(&orb->done);
 390 }
 391
 392 static int
 393 sbp2_send_management_orb(struct fw_unit *unit, int node_id, int generation,
 394                          int function, int lun, void *response)
 395 {
 396         struct fw_device *device = fw_device(unit->device.parent);
 397         struct sbp2_device *sd = unit->device.driver_data;
 398         struct sbp2_management_orb *orb;
 399         int retval = -ENOMEM;
 400
 401         orb = kzalloc(sizeof(*orb), GFP_ATOMIC);
 402         if (orb == NULL)
 403                 return -ENOMEM;
 404
 405         /*
 406          * The sbp2 device is going to send a block read request to
 407          * read out the request from host memory, so map it for dma.
 408          */
 409         orb->base.request_bus =
 410                 dma_map_single(device->card->device, &orb->request,
 411                                sizeof(orb->request), DMA_TO_DEVICE);
 412         if (dma_mapping_error(orb->base.request_bus))
 413                 goto out;
 414
 415         orb->response_bus =
 416                 dma_map_single(device->card->device, &orb->response,
 417                                sizeof(orb->response), DMA_FROM_DEVICE);
 418         if (dma_mapping_error(orb->response_bus))
 419                 goto out;
 420
 421         orb->request.response.high    = 0;
 422         orb->request.response.low     = orb->response_bus;
 423
 424         orb->request.misc =
 425                 MANAGEMENT_ORB_NOTIFY |
 426                 MANAGEMENT_ORB_FUNCTION(function) |
 427                 MANAGEMENT_ORB_LUN(lun);
 428         orb->request.length =
 429                 MANAGEMENT_ORB_RESPONSE_LENGTH(sizeof(orb->response));
 430
 431         orb->request.status_fifo.high = sd->address_handler.offset >> 32;
 432         orb->request.status_fifo.low  = sd->address_handler.offset;
 433
 434         /*
 435          * FIXME: Yeah, ok this isn't elegant, we hardwire exclusive
 436          * login and 1 second reconnect time.  The reconnect setting
 437          * is probably fine, but the exclusive login should be an option.
 438          */
 439         if (function == SBP2_LOGIN_REQUEST) {
 440                 orb->request.misc |=
 441                         MANAGEMENT_ORB_EXCLUSIVE |
 442                         MANAGEMENT_ORB_RECONNECT(0);
 443         }
 444
 445         fw_memcpy_to_be32(&orb->request, &orb->request, sizeof(orb->request));
 446
 447         init_completion(&orb->done);
 448         orb->base.callback = complete_management_orb;
 449
 450         sbp2_send_orb(&orb->base, unit,
 451                       node_id, generation, sd->management_agent_address);
 452
 453         wait_for_completion_timeout(&orb->done,
 454                                     msecs_to_jiffies(SBP2_ORB_TIMEOUT));
 455
 456         retval = -EIO;
 457         if (sbp2_cancel_orbs(unit) == 0) {
 458                 fw_error("orb reply timed out, rcode=0x%02x\n",
 459                          orb->base.rcode);
 460                 goto out;
 461         }
 462
 463         if (orb->base.rcode != RCODE_COMPLETE) {
 464                 fw_error("management write failed, rcode 0x%02x\n",
 465                          orb->base.rcode);
 466                 goto out;
 467         }
 468
 469         if (STATUS_GET_RESPONSE(orb->status) != 0 ||
 470             STATUS_GET_SBP_STATUS(orb->status) != 0) {
 471                 fw_error("error status: %d:%d\n",
 472                          STATUS_GET_RESPONSE(orb->status),
 473                          STATUS_GET_SBP_STATUS(orb->status));
 474                 goto out;
 475         }
 476
 477         retval = 0;
 478  out:
 479         dma_unmap_single(device->card->device, orb->base.request_bus,
 480                          sizeof(orb->request), DMA_TO_DEVICE);
 481         dma_unmap_single(device->card->device, orb->response_bus,
 482                          sizeof(orb->response), DMA_FROM_DEVICE);
 483
 484         if (response)
 485                 fw_memcpy_from_be32(response,
 486                                     orb->response, sizeof(orb->response));
 487         kfree(orb);
 488
 489         return retval;
 490 }
 491
 492 static void
 493 complete_agent_reset_write(struct fw_card *card, int rcode,
 494                            void *payload, size_t length, void *data)
 495 {
 496         struct fw_transaction *t = data;
 497
 498         kfree(t);
 499 }
 500
 501 static int sbp2_agent_reset(struct fw_unit *unit)
 502 {
 503         struct fw_device *device = fw_device(unit->device.parent);
 504         struct sbp2_device *sd = unit->device.driver_data;
 505         struct fw_transaction *t;
 506         static u32 zero;
 507
 508         t = kzalloc(sizeof(*t), GFP_ATOMIC);
 509         if (t == NULL)
 510                 return -ENOMEM;
 511
 512         fw_send_request(device->card, t, TCODE_WRITE_QUADLET_REQUEST,
 513                         sd->node_id, sd->generation, SCODE_400,
 514                         sd->command_block_agent_address + SBP2_AGENT_RESET,
 515                         &zero, sizeof(zero), complete_agent_reset_write, t);
 516
 517         return 0;
 518 }
 519
 520 static void sbp2_reconnect(struct work_struct *work);
 521 static struct scsi_host_template scsi_driver_template;
 522
 523 static void
 524 release_sbp2_device(struct kref *kref)
 525 {
 526         struct sbp2_device *sd = container_of(kref, struct sbp2_device, kref);
 527         struct Scsi_Host *host =
 528                 container_of((void *)sd, struct Scsi_Host, hostdata[0]);
 529
 530         sbp2_send_management_orb(sd->unit, sd->node_id, sd->generation,
 531                                  SBP2_LOGOUT_REQUEST, sd->login_id, NULL);
 532
 533         scsi_remove_host(host);
 534         fw_core_remove_address_handler(&sd->address_handler);
 535         fw_notify("removed sbp2 unit %s\n", sd->unit->device.bus_id);
 536         put_device(&sd->unit->device);
 537         scsi_host_put(host);
 538 }
 539
 540 static void sbp2_login(struct work_struct *work)
 541 {
 542         struct sbp2_device *sd =
 543                 container_of(work, struct sbp2_device, work.work);
 544         struct Scsi_Host *host =
 545                 container_of((void *)sd, struct Scsi_Host, hostdata[0]);
 546         struct fw_unit *unit = sd->unit;
 547         struct fw_device *device = fw_device(unit->device.parent);
 548         struct sbp2_login_response response;
 549         int generation, node_id, local_node_id, lun, retval;
 550
 551         /* FIXME: Make this work for multi-lun devices. */
 552         lun = 0;
 553
 554         generation    = device->card->generation;
 555         node_id       = device->node->node_id;
 556         local_node_id = device->card->local_node->node_id;
 557
 558         if (sbp2_send_management_orb(unit, node_id, generation,
 559                                      SBP2_LOGIN_REQUEST, lun, &response) < 0) {
 560                 if (sd->retries++ < 5) {
 561                         schedule_delayed_work(&sd->work, DIV_ROUND_UP(HZ, 5));
 562                 } else {
 563                         fw_error("failed to login to %s\n",
 564                                  unit->device.bus_id);
 565                         kref_put(&sd->kref, release_sbp2_device);
 566                 }
 567                 return;
 568         }
 569
 570         sd->generation   = generation;
 571         sd->node_id      = node_id;
 572         sd->address_high = local_node_id << 16;
 573
 574         /* Get command block agent offset and login id. */
 575         sd->command_block_agent_address =
 576                 ((u64) (response.command_block_agent.high & 0xffff) << 32) |
 577                 response.command_block_agent.low;
 578         sd->login_id = LOGIN_RESPONSE_GET_LOGIN_ID(response);
 579
 580         fw_notify("logged in to sbp2 unit %s (%d retries)\n",
 581                   unit->device.bus_id, sd->retries);
 582         fw_notify(" - management_agent_address:    0x%012llx\n",
 583                   (unsigned long long) sd->management_agent_address);
 584         fw_notify(" - command_block_agent_address: 0x%012llx\n",
 585                   (unsigned long long) sd->command_block_agent_address);
 586         fw_notify(" - status write address:        0x%012llx\n",
 587                   (unsigned long long) sd->address_handler.offset);
 588
 589 #if 0
 590         /* FIXME: The linux1394 sbp2 does this last step. */
 591         sbp2_set_busy_timeout(scsi_id);
 592 #endif
 593
 594         PREPARE_DELAYED_WORK(&sd->work, sbp2_reconnect);
 595         sbp2_agent_reset(unit);
 596
 597         /* FIXME: Loop over luns here. */
 598         lun = 0;
 599         retval = scsi_add_device(host, 0, 0, lun);
 600         if (retval < 0) {
 601                 sbp2_send_management_orb(unit, sd->node_id, sd->generation,
 602                                          SBP2_LOGOUT_REQUEST, sd->login_id,
 603                                          NULL);
 604                 /*
 605                  * Set this back to sbp2_login so we fall back and
 606                  * retry login on bus reset.
 607                  */
 608                 PREPARE_DELAYED_WORK(&sd->work, sbp2_login);
 609         }
 610         kref_put(&sd->kref, release_sbp2_device);
 611 }
 612
 613 static int sbp2_probe(struct device *dev)
 614 {
 615         struct fw_unit *unit = fw_unit(dev);
 616         struct fw_device *device = fw_device(unit->device.parent);
 617         struct sbp2_device *sd;
 618         struct fw_csr_iterator ci;
 619         struct Scsi_Host *host;
 620         int i, key, value, err;
 621         u32 model, firmware_revision;
 622
 623         err = -ENOMEM;
 624         host = scsi_host_alloc(&scsi_driver_template, sizeof(*sd));
 625         if (host == NULL)
 626                 goto fail;
 627
 628         sd = (struct sbp2_device *) host->hostdata;
 629         unit->device.driver_data = sd;
 630         sd->unit = unit;
 631         INIT_LIST_HEAD(&sd->orb_list);
 632         kref_init(&sd->kref);
 633
 634         sd->address_handler.length = 0x100;
 635         sd->address_handler.address_callback = sbp2_status_write;
 636         sd->address_handler.callback_data = sd;
 637
 638         err = fw_core_add_address_handler(&sd->address_handler,
 639                                           &fw_high_memory_region);
 640         if (err < 0)
 641                 goto fail_host;
 642
 643         err = fw_device_enable_phys_dma(device);
 644         if (err < 0)
 645                 goto fail_address_handler;
 646
 647         err = scsi_add_host(host, &unit->device);
 648         if (err < 0)
 649                 goto fail_address_handler;
 650
 651         /*
 652          * Scan unit directory to get management agent address,
 653          * firmware revison and model.  Initialize firmware_revision
 654          * and model to values that wont match anything in our table.
 655          */
 656         firmware_revision = 0xff000000;
 657         model = 0xff000000;
 658         fw_csr_iterator_init(&ci, unit->directory);
 659         while (fw_csr_iterator_next(&ci, &key, &value)) {
 660                 switch (key) {
 661                 case CSR_DEPENDENT_INFO | CSR_OFFSET:
 662                         sd->management_agent_address =
 663                                 0xfffff0000000ULL + 4 * value;
 664                         break;
 665                 case SBP2_FIRMWARE_REVISION:
 666                         firmware_revision = value;
 667                         break;
 668                 case CSR_MODEL:
 669                         model = value;
 670                         break;
 671                 }
 672         }
 673
 674         for (i = 0; i < ARRAY_SIZE(sbp2_workarounds_table); i++) {
 675                 if (sbp2_workarounds_table[i].firmware_revision !=
 676                     (firmware_revision & 0xffffff00))
 677                         continue;
 678                 if (sbp2_workarounds_table[i].model != model &&
 679                     sbp2_workarounds_table[i].model != ~0)
 680                         continue;
 681                 sd->workarounds |= sbp2_workarounds_table[i].workarounds;
 682                 break;
 683         }
 684
 685         if (sd->workarounds)
 686                 fw_notify("Workarounds for node %s: 0x%x "
 687                           "(firmware_revision 0x%06x, model_id 0x%06x)\n",
 688                           unit->device.bus_id,
 689                           sd->workarounds, firmware_revision, model);
 690
 691         get_device(&unit->device);
 692
 693         /*
 694          * We schedule work to do the login so we can easily
 695          * reschedule retries. Always get the ref before scheduling
 696          * work.
 697          */
 698         INIT_DELAYED_WORK(&sd->work, sbp2_login);
 699         if (schedule_delayed_work(&sd->work, 0))
 700                 kref_get(&sd->kref);
 701
 702         return 0;
 703
 704  fail_address_handler:
 705         fw_core_remove_address_handler(&sd->address_handler);
 706  fail_host:
 707         scsi_host_put(host);
 708  fail:
 709         return err;
 710 }
 711
 712 static int sbp2_remove(struct device *dev)
 713 {
 714         struct fw_unit *unit = fw_unit(dev);
 715         struct sbp2_device *sd = unit->device.driver_data;
 716
 717         kref_put(&sd->kref, release_sbp2_device);
 718
 719         return 0;
 720 }
 721
 722 static void sbp2_reconnect(struct work_struct *work)
 723 {
 724         struct sbp2_device *sd =
 725                 container_of(work, struct sbp2_device, work.work);
 726         struct fw_unit *unit = sd->unit;
 727         struct fw_device *device = fw_device(unit->device.parent);
 728         int generation, node_id, local_node_id;
 729
 730         generation    = device->card->generation;
 731         node_id       = device->node->node_id;
 732         local_node_id = device->card->local_node->node_id;
 733
 734         if (sbp2_send_management_orb(unit, node_id, generation,
 735                                      SBP2_RECONNECT_REQUEST,
 736                                      sd->login_id, NULL) < 0) {
 737                 if (sd->retries++ >= 5) {
 738                         fw_error("failed to reconnect to %s\n",
 739                                  unit->device.bus_id);
 740                         /* Fall back and try to log in again. */
 741                         sd->retries = 0;
 742                         PREPARE_DELAYED_WORK(&sd->work, sbp2_login);
 743                 }
 744                 schedule_delayed_work(&sd->work, DIV_ROUND_UP(HZ, 5));
 745                 return;
 746         }
 747
 748         sd->generation   = generation;
 749         sd->node_id      = node_id;
 750         sd->address_high = local_node_id << 16;
 751
 752         fw_notify("reconnected to unit %s (%d retries)\n",
 753                   unit->device.bus_id, sd->retries);
 754         sbp2_agent_reset(unit);
 755         sbp2_cancel_orbs(unit);
 756         kref_put(&sd->kref, release_sbp2_device);
 757 }
 758
 759 static void sbp2_update(struct fw_unit *unit)
 760 {
 761         struct fw_device *device = fw_device(unit->device.parent);
 762         struct sbp2_device *sd = unit->device.driver_data;
 763
 764         sd->retries = 0;
 765         fw_device_enable_phys_dma(device);
 766         if (schedule_delayed_work(&sd->work, 0))
 767                 kref_get(&sd->kref);
 768 }
 769
 770 #define SBP2_UNIT_SPEC_ID_ENTRY 0x0000609e
 771 #define SBP2_SW_VERSION_ENTRY   0x00010483
 772
 773 static const struct fw_device_id sbp2_id_table[] = {
 774         {
 775                 .match_flags  = FW_MATCH_SPECIFIER_ID | FW_MATCH_VERSION,
 776                 .specifier_id = SBP2_UNIT_SPEC_ID_ENTRY,
 777                 .version      = SBP2_SW_VERSION_ENTRY,
 778         },
 779         { }
 780 };
 781
 782 static struct fw_driver sbp2_driver = {
 783         .driver   = {
 784                 .owner  = THIS_MODULE,
 785                 .name   = sbp2_driver_name,
 786                 .bus    = &fw_bus_type,
 787                 .probe  = sbp2_probe,
 788                 .remove = sbp2_remove,
 789         },
 790         .update   = sbp2_update,
 791         .id_table = sbp2_id_table,
 792 };
 793
 794 static unsigned int
 795 sbp2_status_to_sense_data(u8 *sbp2_status, u8 *sense_data)
 796 {
 797         int sam_status;
 798
 799         sense_data[0] = 0x70;
 800         sense_data[1] = 0x0;
 801         sense_data[2] = sbp2_status[1];
 802         sense_data[3] = sbp2_status[4];
 803         sense_data[4] = sbp2_status[5];
 804         sense_data[5] = sbp2_status[6];
 805         sense_data[6] = sbp2_status[7];
 806         sense_data[7] = 10;
 807         sense_data[8] = sbp2_status[8];
 808         sense_data[9] = sbp2_status[9];
 809         sense_data[10] = sbp2_status[10];
 810         sense_data[11] = sbp2_status[11];
 811         sense_data[12] = sbp2_status[2];
 812         sense_data[13] = sbp2_status[3];
 813         sense_data[14] = sbp2_status[12];
 814         sense_data[15] = sbp2_status[13];
 815
 816         sam_status = sbp2_status[0] & 0x3f;
 817
 818         switch (sam_status) {
 819         case SAM_STAT_GOOD:
 820         case SAM_STAT_CHECK_CONDITION:
 821         case SAM_STAT_CONDITION_MET:
 822         case SAM_STAT_BUSY:
 823         case SAM_STAT_RESERVATION_CONFLICT:
 824         case SAM_STAT_COMMAND_TERMINATED:
 825                 return DID_OK << 16 | sam_status;
 826
 827         default:
 828                 return DID_ERROR << 16;
 829         }
 830 }
 831
 832 static void
 833 complete_command_orb(struct sbp2_orb *base_orb, struct sbp2_status *status)
 834 {
 835         struct sbp2_command_orb *orb = (struct sbp2_command_orb *)base_orb;
 836         struct fw_unit *unit = orb->unit;
 837         struct fw_device *device = fw_device(unit->device.parent);
 838         struct scatterlist *sg;
 839         int result;
 840
 841         if (status != NULL) {
 842                 if (STATUS_GET_DEAD(*status))
 843                         sbp2_agent_reset(unit);
 844
 845                 switch (STATUS_GET_RESPONSE(*status)) {
 846                 case SBP2_STATUS_REQUEST_COMPLETE:
 847                         result = DID_OK << 16;
 848                         break;
 849                 case SBP2_STATUS_TRANSPORT_FAILURE:
 850                         result = DID_BUS_BUSY << 16;
 851                         break;
 852                 case SBP2_STATUS_ILLEGAL_REQUEST:
 853                 case SBP2_STATUS_VENDOR_DEPENDENT:
 854                 default:
 855                         result = DID_ERROR << 16;
 856                         break;
 857                 }
 858
 859                 if (result == DID_OK << 16 && STATUS_GET_LEN(*status) > 1)
 860                         result = sbp2_status_to_sense_data(STATUS_GET_DATA(*status),
 861                                                            orb->cmd->sense_buffer);
 862         } else {
 863                 /*
 864                  * If the orb completes with status == NULL, something
 865                  * went wrong, typically a bus reset happened mid-orb
 866                  * or when sending the write (less likely).
 867                  */
 868                 result = DID_BUS_BUSY << 16;
 869         }
 870
 871         dma_unmap_single(device->card->device, orb->base.request_bus,
 872                          sizeof(orb->request), DMA_TO_DEVICE);
 873
 874         if (orb->cmd->use_sg > 0) {
 875                 sg = (struct scatterlist *)orb->cmd->request_buffer;
 876                 dma_unmap_sg(device->card->device, sg, orb->cmd->use_sg,
 877                              orb->cmd->sc_data_direction);
 878         }
 879
 880         if (orb->page_table_bus != 0)
 881                 dma_unmap_single(device->card->device, orb->page_table_bus,
 882                                  sizeof(orb->page_table_bus), DMA_TO_DEVICE);
 883
 884         orb->cmd->result = result;
 885         orb->done(orb->cmd);
 886         kfree(orb);
 887 }
 888
 889 static int sbp2_command_orb_map_scatterlist(struct sbp2_command_orb *orb)
 890 {
 891         struct sbp2_device *sd =
 892                 (struct sbp2_device *)orb->cmd->device->host->hostdata;
 893         struct fw_unit *unit = sd->unit;
 894         struct fw_device *device = fw_device(unit->device.parent);
 895         struct scatterlist *sg;
 896         int sg_len, l, i, j, count;
 897         size_t size;
 898         dma_addr_t sg_addr;
 899
 900         sg = (struct scatterlist *)orb->cmd->request_buffer;
 901         count = dma_map_sg(device->card->device, sg, orb->cmd->use_sg,
 902                            orb->cmd->sc_data_direction);
 903         if (count == 0)
 904                 goto fail;
 905
 906         /*
 907          * Handle the special case where there is only one element in
 908          * the scatter list by converting it to an immediate block
 909          * request. This is also a workaround for broken devices such
 910          * as the second generation iPod which doesn't support page
 911          * tables.
 912          */
 913         if (count == 1 && sg_dma_len(sg) < SBP2_MAX_SG_ELEMENT_LENGTH) {
 914                 orb->request.data_descriptor.high = sd->address_high;
 915                 orb->request.data_descriptor.low  = sg_dma_address(sg);
 916                 orb->request.misc |=
 917                         COMMAND_ORB_DATA_SIZE(sg_dma_len(sg));
 918                 return 0;
 919         }
 920
 921         /*
 922          * Convert the scatterlist to an sbp2 page table.  If any
 923          * scatterlist entries are too big for sbp2, we split them as we
 924          * go.  Even if we ask the block I/O layer to not give us sg
 925          * elements larger than 65535 bytes, some IOMMUs may merge sg elements
 926          * during DMA mapping, and Linux currently doesn't prevent this.
 927          */
 928         for (i = 0, j = 0; i < count; i++) {
 929                 sg_len = sg_dma_len(sg + i);
 930                 sg_addr = sg_dma_address(sg + i);
 931                 while (sg_len) {
 932                         l = min(sg_len, SBP2_MAX_SG_ELEMENT_LENGTH);
 933                         orb->page_table[j].low = sg_addr;
 934                         orb->page_table[j].high = (l << 16);
 935                         sg_addr += l;
 936                         sg_len -= l;
 937                         j++;
 938                 }
 939         }
 940
 941         size = sizeof(orb->page_table[0]) * j;
 942
 943         /*
 944          * The data_descriptor pointer is the one case where we need
 945          * to fill in the node ID part of the address.  All other
 946          * pointers assume that the data referenced reside on the
 947          * initiator (i.e. us), but data_descriptor can refer to data
 948          * on other nodes so we need to put our ID in descriptor.high.
 949          */
 950
 951         orb->page_table_bus =
 952                 dma_map_single(device->card->device, orb->page_table,
 953                                size, DMA_TO_DEVICE);
 954         if (dma_mapping_error(orb->page_table_bus))
 955                 goto fail_page_table;
 956         orb->request.data_descriptor.high = sd->address_high;
 957         orb->request.data_descriptor.low  = orb->page_table_bus;
 958         orb->request.misc |=
 959                 COMMAND_ORB_PAGE_TABLE_PRESENT |
 960                 COMMAND_ORB_DATA_SIZE(j);
 961
 962         fw_memcpy_to_be32(orb->page_table, orb->page_table, size);
 963
 964         return 0;
 965
 966  fail_page_table:
 967         dma_unmap_sg(device->card->device, sg, orb->cmd->use_sg,
 968                      orb->cmd->sc_data_direction);
 969  fail:
 970         return -ENOMEM;
 971 }
 972
 973 /* SCSI stack integration */
 974
 975 static int sbp2_scsi_queuecommand(struct scsi_cmnd *cmd, scsi_done_fn_t done)
 976 {
 977         struct sbp2_device *sd =
 978                 (struct sbp2_device *)cmd->device->host->hostdata;
 979         struct fw_unit *unit = sd->unit;
 980         struct fw_device *device = fw_device(unit->device.parent);
 981         struct sbp2_command_orb *orb;
 982
 983         /*
 984          * Bidirectional commands are not yet implemented, and unknown
 985          * transfer direction not handled.
 986          */
 987         if (cmd->sc_data_direction == DMA_BIDIRECTIONAL) {
 988                 fw_error("Cannot handle DMA_BIDIRECTIONAL - rejecting command");
 989                 cmd->result = DID_ERROR << 16;
 990                 done(cmd);
 991                 return 0;
 992         }
 993
 994         orb = kzalloc(sizeof(*orb), GFP_ATOMIC);
 995         if (orb == NULL) {
 996                 fw_notify("failed to alloc orb\n");
 997                 goto fail_alloc;
 998         }
 999
1000         /* Initialize rcode to something not RCODE_COMPLETE. */
1001         orb->base.rcode = -1;
1002         orb->base.request_bus =
1003                 dma_map_single(device->card->device, &orb->request,
1004                                sizeof(orb->request), DMA_TO_DEVICE);
1005         if (dma_mapping_error(orb->base.request_bus))
1006                 goto fail_mapping;
1007
1008         orb->unit = unit;
1009         orb->done = done;
1010         orb->cmd  = cmd;
1011
1012         orb->request.next.high   = SBP2_ORB_NULL;
1013         orb->request.next.low    = 0x0;
1014         /*
1015          * At speed 100 we can do 512 bytes per packet, at speed 200,
1016          * 1024 bytes per packet etc.  The SBP-2 max_payload field
1017          * specifies the max payload size as 2 ^ (max_payload + 2), so
1018          * if we set this to max_speed + 7, we get the right value.
1019          */
1020         orb->request.misc =
1021                 COMMAND_ORB_MAX_PAYLOAD(device->node->max_speed + 7) |
1022                 COMMAND_ORB_SPEED(device->node->max_speed) |
1023                 COMMAND_ORB_NOTIFY;
1024
1025         if (cmd->sc_data_direction == DMA_FROM_DEVICE)
1026                 orb->request.misc |=
1027                         COMMAND_ORB_DIRECTION(SBP2_DIRECTION_FROM_MEDIA);
1028         else if (cmd->sc_data_direction == DMA_TO_DEVICE)
1029                 orb->request.misc |=
1030                         COMMAND_ORB_DIRECTION(SBP2_DIRECTION_TO_MEDIA);
1031
1032         if (cmd->use_sg && sbp2_command_orb_map_scatterlist(orb) < 0)
1033                 goto fail_map_payload;
1034
1035         fw_memcpy_to_be32(&orb->request, &orb->request, sizeof(orb->request));
1036
1037         memset(orb->request.command_block,
1038                0, sizeof(orb->request.command_block));
1039         memcpy(orb->request.command_block, cmd->cmnd, COMMAND_SIZE(*cmd->cmnd));
1040
1041         orb->base.callback = complete_command_orb;
1042
1043         sbp2_send_orb(&orb->base, unit, sd->node_id, sd->generation,
1044                       sd->command_block_agent_address + SBP2_ORB_POINTER);
1045
1046         return 0;
1047
1048  fail_map_payload:
1049         dma_unmap_single(device->card->device, orb->base.request_bus,
1050                          sizeof(orb->request), DMA_TO_DEVICE);
1051  fail_mapping:
1052         kfree(orb);
1053  fail_alloc:
1054         return SCSI_MLQUEUE_HOST_BUSY;
1055 }
1056
1057 static int sbp2_scsi_slave_alloc(struct scsi_device *sdev)
1058 {
1059         struct sbp2_device *sd = (struct sbp2_device *)sdev->host->hostdata;
1060
1061         sdev->allow_restart = 1;
1062
1063         if (sd->workarounds & SBP2_WORKAROUND_INQUIRY_36)
1064                 sdev->inquiry_len = 36;
1065         return 0;
1066 }
1067
1068 static int sbp2_scsi_slave_configure(struct scsi_device *sdev)
1069 {
1070         struct sbp2_device *sd = (struct sbp2_device *)sdev->host->hostdata;
1071         struct fw_unit *unit = sd->unit;
1072
1073         sdev->use_10_for_rw = 1;
1074
1075         if (sdev->type == TYPE_ROM)
1076                 sdev->use_10_for_ms = 1;
1077         if (sdev->type == TYPE_DISK &&
1078             sd->workarounds & SBP2_WORKAROUND_MODE_SENSE_8)
1079                 sdev->skip_ms_page_8 = 1;
1080         if (sd->workarounds & SBP2_WORKAROUND_FIX_CAPACITY) {
1081                 fw_notify("setting fix_capacity for %s\n", unit->device.bus_id);
1082                 sdev->fix_capacity = 1;
1083         }
1084
1085         return 0;
1086 }
1087
1088 /*
1089  * Called by scsi stack when something has really gone wrong.  Usually
1090  * called when a command has timed-out for some reason.
1091  */
1092 static int sbp2_scsi_abort(struct scsi_cmnd *cmd)
1093 {
1094         struct sbp2_device *sd =
1095                 (struct sbp2_device *)cmd->device->host->hostdata;
1096         struct fw_unit *unit = sd->unit;
1097
1098         fw_notify("sbp2_scsi_abort\n");
1099         sbp2_agent_reset(unit);
1100         sbp2_cancel_orbs(unit);
1101
1102         return SUCCESS;
1103 }
1104
1105 /*
1106  * Format of /sys/bus/scsi/devices/.../ieee1394_id:
1107  * u64 EUI-64 : u24 directory_ID : u16 LUN  (all printed in hexadecimal)
1108  *
1109  * This is the concatenation of target port identifier and logical unit
1110  * identifier as per SAM-2...SAM-4 annex A.
1111  */
1112 static ssize_t
1113 sbp2_sysfs_ieee1394_id_show(struct device *dev, struct device_attribute *attr,
1114                             char *buf)
1115 {
1116         struct scsi_device *sdev = to_scsi_device(dev);
1117         struct sbp2_device *sd;
1118         struct fw_unit *unit;
1119         struct fw_device *device;
1120         u32 directory_id;
1121         struct fw_csr_iterator ci;
1122         int key, value, lun;
1123
1124         if (!sdev)
1125                 return 0;
1126         sd = (struct sbp2_device *)sdev->host->hostdata;
1127         unit = sd->unit;
1128         device = fw_device(unit->device.parent);
1129
1130         /* implicit directory ID */
1131         directory_id = ((unit->directory - device->config_rom) * 4
1132                         + CSR_CONFIG_ROM) & 0xffffff;
1133
1134         /* explicit directory ID, overrides implicit ID if present */
1135         fw_csr_iterator_init(&ci, unit->directory);
1136         while (fw_csr_iterator_next(&ci, &key, &value))
1137                 if (key == CSR_DIRECTORY_ID) {
1138                         directory_id = value;
1139                         break;
1140                 }
1141
1142         /* FIXME: Make this work for multi-lun devices. */
1143         lun = 0;
1144
1145         return sprintf(buf, "%08x%08x:%06x:%04x\n",
1146                         device->config_rom[3], device->config_rom[4],
1147                         directory_id, lun);
1148 }
1149
1150 static DEVICE_ATTR(ieee1394_id, S_IRUGO, sbp2_sysfs_ieee1394_id_show, NULL);
1151
1152 static struct device_attribute *sbp2_scsi_sysfs_attrs[] = {
1153         &dev_attr_ieee1394_id,
1154         NULL
1155 };
1156
1157 static struct scsi_host_template scsi_driver_template = {
1158         .module                 = THIS_MODULE,
1159         .name                   = "SBP-2 IEEE-1394",
1160         .proc_name              = (char *)sbp2_driver_name,
1161         .queuecommand           = sbp2_scsi_queuecommand,
1162         .slave_alloc            = sbp2_scsi_slave_alloc,
1163         .slave_configure        = sbp2_scsi_slave_configure,
1164         .eh_abort_handler       = sbp2_scsi_abort,
1165         .this_id                = -1,
1166         .sg_tablesize           = SG_ALL,
1167         .use_clustering         = ENABLE_CLUSTERING,
1168         .cmd_per_lun            = 1,
1169         .can_queue              = 1,
1170         .sdev_attrs             = sbp2_scsi_sysfs_attrs,
1171 };
1172
1173 MODULE_AUTHOR("Kristian Hoegsberg <krh@bitplanet.net>");
1174 MODULE_DESCRIPTION("SCSI over IEEE1394");
1175 MODULE_LICENSE("GPL");
1176 MODULE_DEVICE_TABLE(ieee1394, sbp2_id_table);
1177
1178 /* Provide a module alias so root-on-sbp2 initrds don't break. */
1179 #ifndef CONFIG_IEEE1394_SBP2_MODULE
1180 MODULE_ALIAS("sbp2");
1181 #endif
1182
1183 static int __init sbp2_init(void)
1184 {
1185         return driver_register(&sbp2_driver.driver);
1186 }
1187
1188 static void __exit sbp2_cleanup(void)
1189 {
1190         driver_unregister(&sbp2_driver.driver);
1191 }
1192
1193 module_init(sbp2_init);
1194 module_exit(sbp2_cleanup);