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