git.oblomov.eu Git - linux-2.6/blob - drivers/scsi/ps3rom.c

   1 /*
   2  * PS3 BD/DVD/CD-ROM Storage Driver
   3  *
   4  * Copyright (C) 2007 Sony Computer Entertainment Inc.
   5  * Copyright 2007 Sony Corp.
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published
   9  * by the Free Software Foundation; version 2 of the License.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19  */
  20
  21 #include <linux/cdrom.h>
  22 #include <linux/highmem.h>
  23
  24 #include <scsi/scsi.h>
  25 #include <scsi/scsi_cmnd.h>
  26 #include <scsi/scsi_dbg.h>
  27 #include <scsi/scsi_device.h>
  28 #include <scsi/scsi_host.h>
  29
  30 #include <asm/lv1call.h>
  31 #include <asm/ps3stor.h>
  32
  33
  34 #define DEVICE_NAME                     "ps3rom"
  35
  36 #define BOUNCE_SIZE                     (64*1024)
  37
  38 #define PS3ROM_MAX_SECTORS              (BOUNCE_SIZE >> 9)
  39
  40
  41 struct ps3rom_private {
  42         struct ps3_storage_device *dev;
  43         struct scsi_cmnd *curr_cmd;
  44 };
  45
  46
  47 #define LV1_STORAGE_SEND_ATAPI_COMMAND  (1)
  48
  49 struct lv1_atapi_cmnd_block {
  50         u8      pkt[32];        /* packet command block           */
  51         u32     pktlen;         /* should be 12 for ATAPI 8020    */
  52         u32     blocks;
  53         u32     block_size;
  54         u32     proto;          /* transfer mode                  */
  55         u32     in_out;         /* transfer direction             */
  56         u64     buffer;         /* parameter except command block */
  57         u32     arglen;         /* length above                   */
  58 };
  59
  60 enum lv1_atapi_proto {
  61         NON_DATA_PROTO     = 0,
  62         PIO_DATA_IN_PROTO  = 1,
  63         PIO_DATA_OUT_PROTO = 2,
  64         DMA_PROTO = 3
  65 };
  66
  67 enum lv1_atapi_in_out {
  68         DIR_WRITE = 0,          /* memory -> device */
  69         DIR_READ = 1            /* device -> memory */
  70 };
  71
  72
  73 static int ps3rom_slave_configure(struct scsi_device *scsi_dev)
  74 {
  75         struct ps3rom_private *priv = shost_priv(scsi_dev->host);
  76         struct ps3_storage_device *dev = priv->dev;
  77
  78         dev_dbg(&dev->sbd.core, "%s:%u: id %u, lun %u, channel %u\n", __func__,
  79                 __LINE__, scsi_dev->id, scsi_dev->lun, scsi_dev->channel);
  80
  81         /*
  82          * ATAPI SFF8020 devices use MODE_SENSE_10,
  83          * so we can prohibit MODE_SENSE_6
  84          */
  85         scsi_dev->use_10_for_ms = 1;
  86
  87         /* we don't support {READ,WRITE}_6 */
  88         scsi_dev->use_10_for_rw = 1;
  89
  90         return 0;
  91 }
  92
  93 /*
  94  * copy data from device into scatter/gather buffer
  95  */
  96 static int fill_from_dev_buffer(struct scsi_cmnd *cmd, const void *buf)
  97 {
  98         int k, req_len, act_len, len, active;
  99         void *kaddr;
 100         struct scatterlist *sgpnt;
 101         unsigned int buflen;
 102
 103         buflen = scsi_bufflen(cmd);
 104         if (!buflen)
 105                 return 0;
 106
 107         if (!scsi_sglist(cmd))
 108                 return -1;
 109
 110         active = 1;
 111         req_len = act_len = 0;
 112         scsi_for_each_sg(cmd, sgpnt, scsi_sg_count(cmd), k) {
 113                 if (active) {
 114                         kaddr = kmap_atomic(sg_page(sgpnt), KM_IRQ0);
 115                         len = sgpnt->length;
 116                         if ((req_len + len) > buflen) {
 117                                 active = 0;
 118                                 len = buflen - req_len;
 119                         }
 120                         memcpy(kaddr + sgpnt->offset, buf + req_len, len);
 121                         flush_kernel_dcache_page(sg_page(sgpnt));
 122                         kunmap_atomic(kaddr, KM_IRQ0);
 123                         act_len += len;
 124                 }
 125                 req_len += sgpnt->length;
 126         }
 127         scsi_set_resid(cmd, buflen - act_len);
 128         return 0;
 129 }
 130
 131 /*
 132  * copy data from scatter/gather into device's buffer
 133  */
 134 static int fetch_to_dev_buffer(struct scsi_cmnd *cmd, void *buf)
 135 {
 136         int k, req_len, len, fin;
 137         void *kaddr;
 138         struct scatterlist *sgpnt;
 139         unsigned int buflen;
 140
 141         buflen = scsi_bufflen(cmd);
 142         if (!buflen)
 143                 return 0;
 144
 145         if (!scsi_sglist(cmd))
 146                 return -1;
 147
 148         req_len = fin = 0;
 149         scsi_for_each_sg(cmd, sgpnt, scsi_sg_count(cmd), k) {
 150                 kaddr = kmap_atomic(sg_page(sgpnt), KM_IRQ0);
 151                 len = sgpnt->length;
 152                 if ((req_len + len) > buflen) {
 153                         len = buflen - req_len;
 154                         fin = 1;
 155                 }
 156                 memcpy(buf + req_len, kaddr + sgpnt->offset, len);
 157                 kunmap_atomic(kaddr, KM_IRQ0);
 158                 if (fin)
 159                         return req_len + len;
 160                 req_len += sgpnt->length;
 161         }
 162         return req_len;
 163 }
 164
 165 static int ps3rom_atapi_request(struct ps3_storage_device *dev,
 166                                 struct scsi_cmnd *cmd)
 167 {
 168         struct lv1_atapi_cmnd_block atapi_cmnd;
 169         unsigned char opcode = cmd->cmnd[0];
 170         int res;
 171         u64 lpar;
 172
 173         dev_dbg(&dev->sbd.core, "%s:%u: send ATAPI command 0x%02x\n", __func__,
 174                 __LINE__, opcode);
 175
 176         memset(&atapi_cmnd, 0, sizeof(struct lv1_atapi_cmnd_block));
 177         memcpy(&atapi_cmnd.pkt, cmd->cmnd, 12);
 178         atapi_cmnd.pktlen = 12;
 179         atapi_cmnd.block_size = 1; /* transfer size is block_size * blocks */
 180         atapi_cmnd.blocks = atapi_cmnd.arglen = scsi_bufflen(cmd);
 181         atapi_cmnd.buffer = dev->bounce_lpar;
 182
 183         switch (cmd->sc_data_direction) {
 184         case DMA_FROM_DEVICE:
 185                 if (scsi_bufflen(cmd) >= CD_FRAMESIZE)
 186                         atapi_cmnd.proto = DMA_PROTO;
 187                 else
 188                         atapi_cmnd.proto = PIO_DATA_IN_PROTO;
 189                 atapi_cmnd.in_out = DIR_READ;
 190                 break;
 191
 192         case DMA_TO_DEVICE:
 193                 if (scsi_bufflen(cmd) >= CD_FRAMESIZE)
 194                         atapi_cmnd.proto = DMA_PROTO;
 195                 else
 196                         atapi_cmnd.proto = PIO_DATA_OUT_PROTO;
 197                 atapi_cmnd.in_out = DIR_WRITE;
 198                 res = fetch_to_dev_buffer(cmd, dev->bounce_buf);
 199                 if (res < 0)
 200                         return DID_ERROR << 16;
 201                 break;
 202
 203         default:
 204                 atapi_cmnd.proto = NON_DATA_PROTO;
 205                 break;
 206         }
 207
 208         lpar = ps3_mm_phys_to_lpar(__pa(&atapi_cmnd));
 209         res = lv1_storage_send_device_command(dev->sbd.dev_id,
 210                                               LV1_STORAGE_SEND_ATAPI_COMMAND,
 211                                               lpar, sizeof(atapi_cmnd),
 212                                               atapi_cmnd.buffer,
 213                                               atapi_cmnd.arglen, &dev->tag);
 214         if (res == LV1_DENIED_BY_POLICY) {
 215                 dev_dbg(&dev->sbd.core,
 216                         "%s:%u: ATAPI command 0x%02x denied by policy\n",
 217                         __func__, __LINE__, opcode);
 218                 return DID_ERROR << 16;
 219         }
 220
 221         if (res) {
 222                 dev_err(&dev->sbd.core,
 223                         "%s:%u: ATAPI command 0x%02x failed %d\n", __func__,
 224                         __LINE__, opcode, res);
 225                 return DID_ERROR << 16;
 226         }
 227
 228         return 0;
 229 }
 230
 231 static inline unsigned int srb10_lba(const struct scsi_cmnd *cmd)
 232 {
 233         return cmd->cmnd[2] << 24 | cmd->cmnd[3] << 16 | cmd->cmnd[4] << 8 |
 234                cmd->cmnd[5];
 235 }
 236
 237 static inline unsigned int srb10_len(const struct scsi_cmnd *cmd)
 238 {
 239         return cmd->cmnd[7] << 8 | cmd->cmnd[8];
 240 }
 241
 242 static int ps3rom_read_request(struct ps3_storage_device *dev,
 243                                struct scsi_cmnd *cmd, u32 start_sector,
 244                                u32 sectors)
 245 {
 246         int res;
 247
 248         dev_dbg(&dev->sbd.core, "%s:%u: read %u sectors starting at %u\n",
 249                 __func__, __LINE__, sectors, start_sector);
 250
 251         res = lv1_storage_read(dev->sbd.dev_id,
 252                                dev->regions[dev->region_idx].id, start_sector,
 253                                sectors, 0, dev->bounce_lpar, &dev->tag);
 254         if (res) {
 255                 dev_err(&dev->sbd.core, "%s:%u: read failed %d\n", __func__,
 256                         __LINE__, res);
 257                 return DID_ERROR << 16;
 258         }
 259
 260         return 0;
 261 }
 262
 263 static int ps3rom_write_request(struct ps3_storage_device *dev,
 264                                 struct scsi_cmnd *cmd, u32 start_sector,
 265                                 u32 sectors)
 266 {
 267         int res;
 268
 269         dev_dbg(&dev->sbd.core, "%s:%u: write %u sectors starting at %u\n",
 270                 __func__, __LINE__, sectors, start_sector);
 271
 272         res = fetch_to_dev_buffer(cmd, dev->bounce_buf);
 273         if (res < 0)
 274                 return DID_ERROR << 16;
 275
 276         res = lv1_storage_write(dev->sbd.dev_id,
 277                                 dev->regions[dev->region_idx].id, start_sector,
 278                                 sectors, 0, dev->bounce_lpar, &dev->tag);
 279         if (res) {
 280                 dev_err(&dev->sbd.core, "%s:%u: write failed %d\n", __func__,
 281                         __LINE__, res);
 282                 return DID_ERROR << 16;
 283         }
 284
 285         return 0;
 286 }
 287
 288 static int ps3rom_queuecommand(struct scsi_cmnd *cmd,
 289                                void (*done)(struct scsi_cmnd *))
 290 {
 291         struct ps3rom_private *priv = shost_priv(cmd->device->host);
 292         struct ps3_storage_device *dev = priv->dev;
 293         unsigned char opcode;
 294         int res;
 295
 296 #ifdef DEBUG
 297         scsi_print_command(cmd);
 298 #endif
 299
 300         priv->curr_cmd = cmd;
 301         cmd->scsi_done = done;
 302
 303         opcode = cmd->cmnd[0];
 304         /*
 305          * While we can submit READ/WRITE SCSI commands as ATAPI commands,
 306          * it's recommended for various reasons (performance, error handling,
 307          * ...) to use lv1_storage_{read,write}() instead
 308          */
 309         switch (opcode) {
 310         case READ_10:
 311                 res = ps3rom_read_request(dev, cmd, srb10_lba(cmd),
 312                                           srb10_len(cmd));
 313                 break;
 314
 315         case WRITE_10:
 316                 res = ps3rom_write_request(dev, cmd, srb10_lba(cmd),
 317                                            srb10_len(cmd));
 318                 break;
 319
 320         default:
 321                 res = ps3rom_atapi_request(dev, cmd);
 322                 break;
 323         }
 324
 325         if (res) {
 326                 memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
 327                 cmd->result = res;
 328                 cmd->sense_buffer[0] = 0x70;
 329                 cmd->sense_buffer[2] = ILLEGAL_REQUEST;
 330                 priv->curr_cmd = NULL;
 331                 cmd->scsi_done(cmd);
 332         }
 333
 334         return 0;
 335 }
 336
 337 static int decode_lv1_status(u64 status, unsigned char *sense_key,
 338                              unsigned char *asc, unsigned char *ascq)
 339 {
 340         if (((status >> 24) & 0xff) != SAM_STAT_CHECK_CONDITION)
 341                 return -1;
 342
 343         *sense_key = (status >> 16) & 0xff;
 344         *asc       = (status >>  8) & 0xff;
 345         *ascq      =  status        & 0xff;
 346         return 0;
 347 }
 348
 349 static irqreturn_t ps3rom_interrupt(int irq, void *data)
 350 {
 351         struct ps3_storage_device *dev = data;
 352         struct Scsi_Host *host;
 353         struct ps3rom_private *priv;
 354         struct scsi_cmnd *cmd;
 355         int res;
 356         u64 tag, status;
 357         unsigned char sense_key, asc, ascq;
 358
 359         res = lv1_storage_get_async_status(dev->sbd.dev_id, &tag, &status);
 360         /*
 361          * status = -1 may mean that ATAPI transport completed OK, but
 362          * ATAPI command itself resulted CHECK CONDITION
 363          * so, upper layer should issue REQUEST_SENSE to check the sense data
 364          */
 365
 366         if (tag != dev->tag)
 367                 dev_err(&dev->sbd.core,
 368                         "%s:%u: tag mismatch, got %lx, expected %lx\n",
 369                         __func__, __LINE__, tag, dev->tag);
 370
 371         if (res) {
 372                 dev_err(&dev->sbd.core, "%s:%u: res=%d status=0x%lx\n",
 373                         __func__, __LINE__, res, status);
 374                 return IRQ_HANDLED;
 375         }
 376
 377         host = dev->sbd.core.driver_data;
 378         priv = shost_priv(host);
 379         cmd = priv->curr_cmd;
 380
 381         if (!status) {
 382                 /* OK, completed */
 383                 if (cmd->sc_data_direction == DMA_FROM_DEVICE) {
 384                         res = fill_from_dev_buffer(cmd, dev->bounce_buf);
 385                         if (res) {
 386                                 cmd->result = DID_ERROR << 16;
 387                                 goto done;
 388                         }
 389                 }
 390                 cmd->result = DID_OK << 16;
 391                 goto done;
 392         }
 393
 394         if (cmd->cmnd[0] == REQUEST_SENSE) {
 395                 /* SCSI spec says request sense should never get error */
 396                 dev_err(&dev->sbd.core, "%s:%u: end error without autosense\n",
 397                         __func__, __LINE__);
 398                 cmd->result = DID_ERROR << 16 | SAM_STAT_CHECK_CONDITION;
 399                 goto done;
 400         }
 401
 402         if (decode_lv1_status(status, &sense_key, &asc, &ascq)) {
 403                 cmd->result = DID_ERROR << 16;
 404                 goto done;
 405         }
 406
 407         cmd->sense_buffer[0]  = 0x70;
 408         cmd->sense_buffer[2]  = sense_key;
 409         cmd->sense_buffer[7]  = 16 - 6;
 410         cmd->sense_buffer[12] = asc;
 411         cmd->sense_buffer[13] = ascq;
 412         cmd->result = SAM_STAT_CHECK_CONDITION;
 413
 414 done:
 415         priv->curr_cmd = NULL;
 416         cmd->scsi_done(cmd);
 417         return IRQ_HANDLED;
 418 }
 419
 420 static struct scsi_host_template ps3rom_host_template = {
 421         .name =                 DEVICE_NAME,
 422         .slave_configure =      ps3rom_slave_configure,
 423         .queuecommand =         ps3rom_queuecommand,
 424         .can_queue =            1,
 425         .this_id =              7,
 426         .sg_tablesize =         SG_ALL,
 427         .cmd_per_lun =          1,
 428         .emulated =             1,              /* only sg driver uses this */
 429         .max_sectors =          PS3ROM_MAX_SECTORS,
 430         .use_clustering =       DISABLE_CLUSTERING,
 431         .module =               THIS_MODULE,
 432 };
 433
 434
 435 static int __devinit ps3rom_probe(struct ps3_system_bus_device *_dev)
 436 {
 437         struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
 438         int error;
 439         struct Scsi_Host *host;
 440         struct ps3rom_private *priv;
 441
 442         if (dev->blk_size != CD_FRAMESIZE) {
 443                 dev_err(&dev->sbd.core,
 444                         "%s:%u: cannot handle block size %lu\n", __func__,
 445                         __LINE__, dev->blk_size);
 446                 return -EINVAL;
 447         }
 448
 449         dev->bounce_size = BOUNCE_SIZE;
 450         dev->bounce_buf = kmalloc(BOUNCE_SIZE, GFP_DMA);
 451         if (!dev->bounce_buf)
 452                 return -ENOMEM;
 453
 454         error = ps3stor_setup(dev, ps3rom_interrupt);
 455         if (error)
 456                 goto fail_free_bounce;
 457
 458         host = scsi_host_alloc(&ps3rom_host_template,
 459                                sizeof(struct ps3rom_private));
 460         if (!host) {
 461                 dev_err(&dev->sbd.core, "%s:%u: scsi_host_alloc failed\n",
 462                         __func__, __LINE__);
 463                 goto fail_teardown;
 464         }
 465
 466         priv = shost_priv(host);
 467         dev->sbd.core.driver_data = host;
 468         priv->dev = dev;
 469
 470         /* One device/LUN per SCSI bus */
 471         host->max_id = 1;
 472         host->max_lun = 1;
 473
 474         error = scsi_add_host(host, &dev->sbd.core);
 475         if (error) {
 476                 dev_err(&dev->sbd.core, "%s:%u: scsi_host_alloc failed %d\n",
 477                         __func__, __LINE__, error);
 478                 error = -ENODEV;
 479                 goto fail_host_put;
 480         }
 481
 482         scsi_scan_host(host);
 483         return 0;
 484
 485 fail_host_put:
 486         scsi_host_put(host);
 487         dev->sbd.core.driver_data = NULL;
 488 fail_teardown:
 489         ps3stor_teardown(dev);
 490 fail_free_bounce:
 491         kfree(dev->bounce_buf);
 492         return error;
 493 }
 494
 495 static int ps3rom_remove(struct ps3_system_bus_device *_dev)
 496 {
 497         struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
 498         struct Scsi_Host *host = dev->sbd.core.driver_data;
 499
 500         scsi_remove_host(host);
 501         ps3stor_teardown(dev);
 502         scsi_host_put(host);
 503         dev->sbd.core.driver_data = NULL;
 504         kfree(dev->bounce_buf);
 505         return 0;
 506 }
 507
 508 static struct ps3_system_bus_driver ps3rom = {
 509         .match_id       = PS3_MATCH_ID_STOR_ROM,
 510         .core.name      = DEVICE_NAME,
 511         .core.owner     = THIS_MODULE,
 512         .probe          = ps3rom_probe,
 513         .remove         = ps3rom_remove
 514 };
 515
 516
 517 static int __init ps3rom_init(void)
 518 {
 519         return ps3_system_bus_driver_register(&ps3rom);
 520 }
 521
 522 static void __exit ps3rom_exit(void)
 523 {
 524         ps3_system_bus_driver_unregister(&ps3rom);
 525 }
 526
 527 module_init(ps3rom_init);
 528 module_exit(ps3rom_exit);
 529
 530 MODULE_LICENSE("GPL");
 531 MODULE_DESCRIPTION("PS3 BD/DVD/CD-ROM Storage Driver");
 532 MODULE_AUTHOR("Sony Corporation");
 533 MODULE_ALIAS(PS3_MODULE_ALIAS_STOR_ROM);