release/src-rt-6.x.4708/linux/linux-2.6.36/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 #include <linux/slab.h>
  24
  25 #include <scsi/scsi.h>
  26 #include <scsi/scsi_cmnd.h>
  27 #include <scsi/scsi_dbg.h>
  28 #include <scsi/scsi_device.h>
  29 #include <scsi/scsi_host.h>
  30 #include <scsi/scsi_eh.h>
  31
  32 #include <asm/lv1call.h>
  33 #include <asm/ps3stor.h>
  34
  35
  36 #define DEVICE_NAME                     "ps3rom"
  37
  38 #define BOUNCE_SIZE                     (64*1024)
  39
  40 #define PS3ROM_MAX_SECTORS              (BOUNCE_SIZE >> 9)
  41
  42
  43 struct ps3rom_private {
  44         struct ps3_storage_device *dev;
  45         struct scsi_cmnd *curr_cmd;
  46 };
  47
  48
  49 #define LV1_STORAGE_SEND_ATAPI_COMMAND  (1)
  50
  51 struct lv1_atapi_cmnd_block {
  52         u8      pkt[32];        /* packet command block           */
  53         u32     pktlen;         /* should be 12 for ATAPI 8020    */
  54         u32     blocks;
  55         u32     block_size;
  56         u32     proto;          /* transfer mode                  */
  57         u32     in_out;         /* transfer direction             */
  58         u64     buffer;         /* parameter except command block */
  59         u32     arglen;         /* length above                   */
  60 };
  61
  62 enum lv1_atapi_proto {
  63         NON_DATA_PROTO     = 0,
  64         PIO_DATA_IN_PROTO  = 1,
  65         PIO_DATA_OUT_PROTO = 2,
  66         DMA_PROTO = 3
  67 };
  68
  69 enum lv1_atapi_in_out {
  70         DIR_WRITE = 0,          /* memory -> device */
  71         DIR_READ = 1            /* device -> memory */
  72 };
  73
  74
  75 static int ps3rom_slave_configure(struct scsi_device *scsi_dev)
  76 {
  77         struct ps3rom_private *priv = shost_priv(scsi_dev->host);
  78         struct ps3_storage_device *dev = priv->dev;
  79
  80         dev_dbg(&dev->sbd.core, "%s:%u: id %u, lun %u, channel %u\n", __func__,
  81                 __LINE__, scsi_dev->id, scsi_dev->lun, scsi_dev->channel);
  82
  83         /*
  84          * ATAPI SFF8020 devices use MODE_SENSE_10,
  85          * so we can prohibit MODE_SENSE_6
  86          */
  87         scsi_dev->use_10_for_ms = 1;
  88
  89         /* we don't support {READ,WRITE}_6 */
  90         scsi_dev->use_10_for_rw = 1;
  91
  92         return 0;
  93 }
  94
  95 static int ps3rom_atapi_request(struct ps3_storage_device *dev,
  96                                 struct scsi_cmnd *cmd)
  97 {
  98         struct lv1_atapi_cmnd_block atapi_cmnd;
  99         unsigned char opcode = cmd->cmnd[0];
 100         int res;
 101         u64 lpar;
 102
 103         dev_dbg(&dev->sbd.core, "%s:%u: send ATAPI command 0x%02x\n", __func__,
 104                 __LINE__, opcode);
 105
 106         memset(&atapi_cmnd, 0, sizeof(struct lv1_atapi_cmnd_block));
 107         memcpy(&atapi_cmnd.pkt, cmd->cmnd, 12);
 108         atapi_cmnd.pktlen = 12;
 109         atapi_cmnd.block_size = 1; /* transfer size is block_size * blocks */
 110         atapi_cmnd.blocks = atapi_cmnd.arglen = scsi_bufflen(cmd);
 111         atapi_cmnd.buffer = dev->bounce_lpar;
 112
 113         switch (cmd->sc_data_direction) {
 114         case DMA_FROM_DEVICE:
 115                 if (scsi_bufflen(cmd) >= CD_FRAMESIZE)
 116                         atapi_cmnd.proto = DMA_PROTO;
 117                 else
 118                         atapi_cmnd.proto = PIO_DATA_IN_PROTO;
 119                 atapi_cmnd.in_out = DIR_READ;
 120                 break;
 121
 122         case DMA_TO_DEVICE:
 123                 if (scsi_bufflen(cmd) >= CD_FRAMESIZE)
 124                         atapi_cmnd.proto = DMA_PROTO;
 125                 else
 126                         atapi_cmnd.proto = PIO_DATA_OUT_PROTO;
 127                 atapi_cmnd.in_out = DIR_WRITE;
 128                 scsi_sg_copy_to_buffer(cmd, dev->bounce_buf, dev->bounce_size);
 129                 break;
 130
 131         default:
 132                 atapi_cmnd.proto = NON_DATA_PROTO;
 133                 break;
 134         }
 135
 136         lpar = ps3_mm_phys_to_lpar(__pa(&atapi_cmnd));
 137         res = lv1_storage_send_device_command(dev->sbd.dev_id,
 138                                               LV1_STORAGE_SEND_ATAPI_COMMAND,
 139                                               lpar, sizeof(atapi_cmnd),
 140                                               atapi_cmnd.buffer,
 141                                               atapi_cmnd.arglen, &dev->tag);
 142         if (res == LV1_DENIED_BY_POLICY) {
 143                 dev_dbg(&dev->sbd.core,
 144                         "%s:%u: ATAPI command 0x%02x denied by policy\n",
 145                         __func__, __LINE__, opcode);
 146                 return DID_ERROR << 16;
 147         }
 148
 149         if (res) {
 150                 dev_err(&dev->sbd.core,
 151                         "%s:%u: ATAPI command 0x%02x failed %d\n", __func__,
 152                         __LINE__, opcode, res);
 153                 return DID_ERROR << 16;
 154         }
 155
 156         return 0;
 157 }
 158
 159 static inline unsigned int srb10_lba(const struct scsi_cmnd *cmd)
 160 {
 161         return cmd->cmnd[2] << 24 | cmd->cmnd[3] << 16 | cmd->cmnd[4] << 8 |
 162                cmd->cmnd[5];
 163 }
 164
 165 static inline unsigned int srb10_len(const struct scsi_cmnd *cmd)
 166 {
 167         return cmd->cmnd[7] << 8 | cmd->cmnd[8];
 168 }
 169
 170 static int ps3rom_read_request(struct ps3_storage_device *dev,
 171                                struct scsi_cmnd *cmd, u32 start_sector,
 172                                u32 sectors)
 173 {
 174         int res;
 175
 176         dev_dbg(&dev->sbd.core, "%s:%u: read %u sectors starting at %u\n",
 177                 __func__, __LINE__, sectors, start_sector);
 178
 179         res = lv1_storage_read(dev->sbd.dev_id,
 180                                dev->regions[dev->region_idx].id, start_sector,
 181                                sectors, 0, dev->bounce_lpar, &dev->tag);
 182         if (res) {
 183                 dev_err(&dev->sbd.core, "%s:%u: read failed %d\n", __func__,
 184                         __LINE__, res);
 185                 return DID_ERROR << 16;
 186         }
 187
 188         return 0;
 189 }
 190
 191 static int ps3rom_write_request(struct ps3_storage_device *dev,
 192                                 struct scsi_cmnd *cmd, u32 start_sector,
 193                                 u32 sectors)
 194 {
 195         int res;
 196
 197         dev_dbg(&dev->sbd.core, "%s:%u: write %u sectors starting at %u\n",
 198                 __func__, __LINE__, sectors, start_sector);
 199
 200         scsi_sg_copy_to_buffer(cmd, dev->bounce_buf, dev->bounce_size);
 201
 202         res = lv1_storage_write(dev->sbd.dev_id,
 203                                 dev->regions[dev->region_idx].id, start_sector,
 204                                 sectors, 0, dev->bounce_lpar, &dev->tag);
 205         if (res) {
 206                 dev_err(&dev->sbd.core, "%s:%u: write failed %d\n", __func__,
 207                         __LINE__, res);
 208                 return DID_ERROR << 16;
 209         }
 210
 211         return 0;
 212 }
 213
 214 static int ps3rom_queuecommand(struct scsi_cmnd *cmd,
 215                                void (*done)(struct scsi_cmnd *))
 216 {
 217         struct ps3rom_private *priv = shost_priv(cmd->device->host);
 218         struct ps3_storage_device *dev = priv->dev;
 219         unsigned char opcode;
 220         int res;
 221
 222 #ifdef DEBUG
 223         scsi_print_command(cmd);
 224 #endif
 225
 226         priv->curr_cmd = cmd;
 227         cmd->scsi_done = done;
 228
 229         opcode = cmd->cmnd[0];
 230         /*
 231          * While we can submit READ/WRITE SCSI commands as ATAPI commands,
 232          * it's recommended for various reasons (performance, error handling,
 233          * ...) to use lv1_storage_{read,write}() instead
 234          */
 235         switch (opcode) {
 236         case READ_10:
 237                 res = ps3rom_read_request(dev, cmd, srb10_lba(cmd),
 238                                           srb10_len(cmd));
 239                 break;
 240
 241         case WRITE_10:
 242                 res = ps3rom_write_request(dev, cmd, srb10_lba(cmd),
 243                                            srb10_len(cmd));
 244                 break;
 245
 246         default:
 247                 res = ps3rom_atapi_request(dev, cmd);
 248                 break;
 249         }
 250
 251         if (res) {
 252                 memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
 253                 cmd->result = res;
 254                 cmd->sense_buffer[0] = 0x70;
 255                 cmd->sense_buffer[2] = ILLEGAL_REQUEST;
 256                 priv->curr_cmd = NULL;
 257                 cmd->scsi_done(cmd);
 258         }
 259
 260         return 0;
 261 }
 262
 263 static int decode_lv1_status(u64 status, unsigned char *sense_key,
 264                              unsigned char *asc, unsigned char *ascq)
 265 {
 266         if (((status >> 24) & 0xff) != SAM_STAT_CHECK_CONDITION)
 267                 return -1;
 268
 269         *sense_key = (status >> 16) & 0xff;
 270         *asc       = (status >>  8) & 0xff;
 271         *ascq      =  status        & 0xff;
 272         return 0;
 273 }
 274
 275 static irqreturn_t ps3rom_interrupt(int irq, void *data)
 276 {
 277         struct ps3_storage_device *dev = data;
 278         struct Scsi_Host *host;
 279         struct ps3rom_private *priv;
 280         struct scsi_cmnd *cmd;
 281         int res;
 282         u64 tag, status;
 283         unsigned char sense_key, asc, ascq;
 284
 285         res = lv1_storage_get_async_status(dev->sbd.dev_id, &tag, &status);
 286         /*
 287          * status = -1 may mean that ATAPI transport completed OK, but
 288          * ATAPI command itself resulted CHECK CONDITION
 289          * so, upper layer should issue REQUEST_SENSE to check the sense data
 290          */
 291
 292         if (tag != dev->tag)
 293                 dev_err(&dev->sbd.core,
 294                         "%s:%u: tag mismatch, got %llx, expected %llx\n",
 295                         __func__, __LINE__, tag, dev->tag);
 296
 297         if (res) {
 298                 dev_err(&dev->sbd.core, "%s:%u: res=%d status=0x%llx\n",
 299                         __func__, __LINE__, res, status);
 300                 return IRQ_HANDLED;
 301         }
 302
 303         host = ps3_system_bus_get_drvdata(&dev->sbd);
 304         priv = shost_priv(host);
 305         cmd = priv->curr_cmd;
 306
 307         if (!status) {
 308                 /* OK, completed */
 309                 if (cmd->sc_data_direction == DMA_FROM_DEVICE) {
 310                         int len;
 311
 312                         len = scsi_sg_copy_from_buffer(cmd,
 313                                                        dev->bounce_buf,
 314                                                        dev->bounce_size);
 315
 316                         scsi_set_resid(cmd, scsi_bufflen(cmd) - len);
 317                 }
 318                 cmd->result = DID_OK << 16;
 319                 goto done;
 320         }
 321
 322         if (cmd->cmnd[0] == REQUEST_SENSE) {
 323                 /* SCSI spec says request sense should never get error */
 324                 dev_err(&dev->sbd.core, "%s:%u: end error without autosense\n",
 325                         __func__, __LINE__);
 326                 cmd->result = DID_ERROR << 16 | SAM_STAT_CHECK_CONDITION;
 327                 goto done;
 328         }
 329
 330         if (decode_lv1_status(status, &sense_key, &asc, &ascq)) {
 331                 cmd->result = DID_ERROR << 16;
 332                 goto done;
 333         }
 334
 335         scsi_build_sense_buffer(0, cmd->sense_buffer, sense_key, asc, ascq);
 336         cmd->result = SAM_STAT_CHECK_CONDITION;
 337
 338 done:
 339         priv->curr_cmd = NULL;
 340         cmd->scsi_done(cmd);
 341         return IRQ_HANDLED;
 342 }
 343
 344 static struct scsi_host_template ps3rom_host_template = {
 345         .name =                 DEVICE_NAME,
 346         .slave_configure =      ps3rom_slave_configure,
 347         .queuecommand =         ps3rom_queuecommand,
 348         .can_queue =            1,
 349         .this_id =              7,
 350         .sg_tablesize =         SG_ALL,
 351         .cmd_per_lun =          1,
 352         .emulated =             1,              /* only sg driver uses this */
 353         .max_sectors =          PS3ROM_MAX_SECTORS,
 354         .use_clustering =       ENABLE_CLUSTERING,
 355         .module =               THIS_MODULE,
 356 };
 357
 358
 359 static int __devinit ps3rom_probe(struct ps3_system_bus_device *_dev)
 360 {
 361         struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
 362         int error;
 363         struct Scsi_Host *host;
 364         struct ps3rom_private *priv;
 365
 366         if (dev->blk_size != CD_FRAMESIZE) {
 367                 dev_err(&dev->sbd.core,
 368                         "%s:%u: cannot handle block size %llu\n", __func__,
 369                         __LINE__, dev->blk_size);
 370                 return -EINVAL;
 371         }
 372
 373         dev->bounce_size = BOUNCE_SIZE;
 374         dev->bounce_buf = kmalloc(BOUNCE_SIZE, GFP_DMA);
 375         if (!dev->bounce_buf)
 376                 return -ENOMEM;
 377
 378         error = ps3stor_setup(dev, ps3rom_interrupt);
 379         if (error)
 380                 goto fail_free_bounce;
 381
 382         host = scsi_host_alloc(&ps3rom_host_template,
 383                                sizeof(struct ps3rom_private));
 384         if (!host) {
 385                 dev_err(&dev->sbd.core, "%s:%u: scsi_host_alloc failed\n",
 386                         __func__, __LINE__);
 387                 goto fail_teardown;
 388         }
 389
 390         priv = shost_priv(host);
 391         ps3_system_bus_set_drvdata(&dev->sbd, host);
 392         priv->dev = dev;
 393
 394         /* One device/LUN per SCSI bus */
 395         host->max_id = 1;
 396         host->max_lun = 1;
 397
 398         error = scsi_add_host(host, &dev->sbd.core);
 399         if (error) {
 400                 dev_err(&dev->sbd.core, "%s:%u: scsi_host_alloc failed %d\n",
 401                         __func__, __LINE__, error);
 402                 error = -ENODEV;
 403                 goto fail_host_put;
 404         }
 405
 406         scsi_scan_host(host);
 407         return 0;
 408
 409 fail_host_put:
 410         scsi_host_put(host);
 411         ps3_system_bus_set_drvdata(&dev->sbd, NULL);
 412 fail_teardown:
 413         ps3stor_teardown(dev);
 414 fail_free_bounce:
 415         kfree(dev->bounce_buf);
 416         return error;
 417 }
 418
 419 static int ps3rom_remove(struct ps3_system_bus_device *_dev)
 420 {
 421         struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
 422         struct Scsi_Host *host = ps3_system_bus_get_drvdata(&dev->sbd);
 423
 424         scsi_remove_host(host);
 425         ps3stor_teardown(dev);
 426         scsi_host_put(host);
 427         ps3_system_bus_set_drvdata(&dev->sbd, NULL);
 428         kfree(dev->bounce_buf);
 429         return 0;
 430 }
 431
 432 static struct ps3_system_bus_driver ps3rom = {
 433         .match_id       = PS3_MATCH_ID_STOR_ROM,
 434         .core.name      = DEVICE_NAME,
 435         .core.owner     = THIS_MODULE,
 436         .probe          = ps3rom_probe,
 437         .remove         = ps3rom_remove
 438 };
 439
 440
 441 static int __init ps3rom_init(void)
 442 {
 443         return ps3_system_bus_driver_register(&ps3rom);
 444 }
 445
 446 static void __exit ps3rom_exit(void)
 447 {
 448         ps3_system_bus_driver_unregister(&ps3rom);
 449 }
 450
 451 module_init(ps3rom_init);
 452 module_exit(ps3rom_exit);
 453
 454 MODULE_LICENSE("GPL");
 455 MODULE_DESCRIPTION("PS3 BD/DVD/CD-ROM Storage Driver");
 456 MODULE_AUTHOR("Sony Corporation");
 457 MODULE_ALIAS(PS3_MODULE_ALIAS_STOR_ROM);