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/module.h>
  24 #include <linux/slab.h>
  25
  26 #include <scsi/scsi.h>
  27 #include <scsi/scsi_cmnd.h>
  28 #include <scsi/scsi_dbg.h>
  29 #include <scsi/scsi_device.h>
  30 #include <scsi/scsi_host.h>
  31 #include <scsi/scsi_eh.h>
  32
  33 #include <asm/lv1call.h>
  34 #include <asm/ps3stor.h>
  35
  36
  37 #define DEVICE_NAME                     "ps3rom"
  38
  39 #define BOUNCE_SIZE                     (64*1024)
  40
  41 #define PS3ROM_MAX_SECTORS              (BOUNCE_SIZE >> 9)
  42
  43
  44 struct ps3rom_private {
  45         struct ps3_storage_device *dev;
  46         struct scsi_cmnd *curr_cmd;
  47 };
  48
  49
  50 #define LV1_STORAGE_SEND_ATAPI_COMMAND  (1)
  51
  52 struct lv1_atapi_cmnd_block {
  53         u8      pkt[32];        /* packet command block           */
  54         u32     pktlen;         /* should be 12 for ATAPI 8020    */
  55         u32     blocks;
  56         u32     block_size;
  57         u32     proto;          /* transfer mode                  */
  58         u32     in_out;         /* transfer direction             */
  59         u64     buffer;         /* parameter except command block */
  60         u32     arglen;         /* length above                   */
  61 };
  62
  63 enum lv1_atapi_proto {
  64         NON_DATA_PROTO     = 0,
  65         PIO_DATA_IN_PROTO  = 1,
  66         PIO_DATA_OUT_PROTO = 2,
  67         DMA_PROTO = 3
  68 };
  69
  70 enum lv1_atapi_in_out {
  71         DIR_WRITE = 0,          /* memory -> device */
  72         DIR_READ = 1            /* device -> memory */
  73 };
  74
  75
  76 static int ps3rom_slave_configure(struct scsi_device *scsi_dev)
  77 {
  78         struct ps3rom_private *priv = shost_priv(scsi_dev->host);
  79         struct ps3_storage_device *dev = priv->dev;
  80
  81         dev_dbg(&dev->sbd.core, "%s:%u: id %u, lun %llu, channel %u\n", __func__,
  82                 __LINE__, scsi_dev->id, scsi_dev->lun, scsi_dev->channel);
  83
  84         /*
  85          * ATAPI SFF8020 devices use MODE_SENSE_10,
  86          * so we can prohibit MODE_SENSE_6
  87          */
  88         scsi_dev->use_10_for_ms = 1;
  89
  90         /* we don't support {READ,WRITE}_6 */
  91         scsi_dev->use_10_for_rw = 1;
  92
  93         return 0;
  94 }
  95
  96 static int ps3rom_atapi_request(struct ps3_storage_device *dev,
  97                                 struct scsi_cmnd *cmd)
  98 {
  99         struct lv1_atapi_cmnd_block atapi_cmnd;
 100         unsigned char opcode = cmd->cmnd[0];
 101         int res;
 102         u64 lpar;
 103
 104         dev_dbg(&dev->sbd.core, "%s:%u: send ATAPI command 0x%02x\n", __func__,
 105                 __LINE__, opcode);
 106
 107         memset(&atapi_cmnd, 0, sizeof(struct lv1_atapi_cmnd_block));
 108         memcpy(&atapi_cmnd.pkt, cmd->cmnd, 12);
 109         atapi_cmnd.pktlen = 12;
 110         atapi_cmnd.block_size = 1; /* transfer size is block_size * blocks */
 111         atapi_cmnd.blocks = atapi_cmnd.arglen = scsi_bufflen(cmd);
 112         atapi_cmnd.buffer = dev->bounce_lpar;
 113
 114         switch (cmd->sc_data_direction) {
 115         case DMA_FROM_DEVICE:
 116                 if (scsi_bufflen(cmd) >= CD_FRAMESIZE)
 117                         atapi_cmnd.proto = DMA_PROTO;
 118                 else
 119                         atapi_cmnd.proto = PIO_DATA_IN_PROTO;
 120                 atapi_cmnd.in_out = DIR_READ;
 121                 break;
 122
 123         case DMA_TO_DEVICE:
 124                 if (scsi_bufflen(cmd) >= CD_FRAMESIZE)
 125                         atapi_cmnd.proto = DMA_PROTO;
 126                 else
 127                         atapi_cmnd.proto = PIO_DATA_OUT_PROTO;
 128                 atapi_cmnd.in_out = DIR_WRITE;
 129                 scsi_sg_copy_to_buffer(cmd, dev->bounce_buf, dev->bounce_size);
 130                 break;
 131
 132         default:
 133                 atapi_cmnd.proto = NON_DATA_PROTO;
 134                 break;
 135         }
 136
 137         lpar = ps3_mm_phys_to_lpar(__pa(&atapi_cmnd));
 138         res = lv1_storage_send_device_command(dev->sbd.dev_id,
 139                                               LV1_STORAGE_SEND_ATAPI_COMMAND,
 140                                               lpar, sizeof(atapi_cmnd),
 141                                               atapi_cmnd.buffer,
 142                                               atapi_cmnd.arglen, &dev->tag);
 143         if (res == LV1_DENIED_BY_POLICY) {
 144                 dev_dbg(&dev->sbd.core,
 145                         "%s:%u: ATAPI command 0x%02x denied by policy\n",
 146                         __func__, __LINE__, opcode);
 147                 return DID_ERROR << 16;
 148         }
 149
 150         if (res) {
 151                 dev_err(&dev->sbd.core,
 152                         "%s:%u: ATAPI command 0x%02x failed %d\n", __func__,
 153                         __LINE__, opcode, res);
 154                 return DID_ERROR << 16;
 155         }
 156
 157         return 0;
 158 }
 159
 160 static inline unsigned int srb10_lba(const struct scsi_cmnd *cmd)
 161 {
 162         return cmd->cmnd[2] << 24 | cmd->cmnd[3] << 16 | cmd->cmnd[4] << 8 |
 163                cmd->cmnd[5];
 164 }
 165
 166 static inline unsigned int srb10_len(const struct scsi_cmnd *cmd)
 167 {
 168         return cmd->cmnd[7] << 8 | cmd->cmnd[8];
 169 }
 170
 171 static int ps3rom_read_request(struct ps3_storage_device *dev,
 172                                struct scsi_cmnd *cmd, u32 start_sector,
 173                                u32 sectors)
 174 {
 175         int res;
 176
 177         dev_dbg(&dev->sbd.core, "%s:%u: read %u sectors starting at %u\n",
 178                 __func__, __LINE__, sectors, start_sector);
 179
 180         res = lv1_storage_read(dev->sbd.dev_id,
 181                                dev->regions[dev->region_idx].id, start_sector,
 182                                sectors, 0, dev->bounce_lpar, &dev->tag);
 183         if (res) {
 184                 dev_err(&dev->sbd.core, "%s:%u: read failed %d\n", __func__,
 185                         __LINE__, res);
 186                 return DID_ERROR << 16;
 187         }
 188
 189         return 0;
 190 }
 191
 192 static int ps3rom_write_request(struct ps3_storage_device *dev,
 193                                 struct scsi_cmnd *cmd, u32 start_sector,
 194                                 u32 sectors)
 195 {
 196         int res;
 197
 198         dev_dbg(&dev->sbd.core, "%s:%u: write %u sectors starting at %u\n",
 199                 __func__, __LINE__, sectors, start_sector);
 200
 201         scsi_sg_copy_to_buffer(cmd, dev->bounce_buf, dev->bounce_size);
 202
 203         res = lv1_storage_write(dev->sbd.dev_id,
 204                                 dev->regions[dev->region_idx].id, start_sector,
 205                                 sectors, 0, dev->bounce_lpar, &dev->tag);
 206         if (res) {
 207                 dev_err(&dev->sbd.core, "%s:%u: write failed %d\n", __func__,
 208                         __LINE__, res);
 209                 return DID_ERROR << 16;
 210         }
 211
 212         return 0;
 213 }
 214
 215 static int ps3rom_queuecommand_lck(struct scsi_cmnd *cmd,
 216                                void (*done)(struct scsi_cmnd *))
 217 {
 218         struct ps3rom_private *priv = shost_priv(cmd->device->host);
 219         struct ps3_storage_device *dev = priv->dev;
 220         unsigned char opcode;
 221         int res;
 222
 223         priv->curr_cmd = cmd;
 224         cmd->scsi_done = done;
 225
 226         opcode = cmd->cmnd[0];
 227         /*
 228          * While we can submit READ/WRITE SCSI commands as ATAPI commands,
 229          * it's recommended for various reasons (performance, error handling,
 230          * ...) to use lv1_storage_{read,write}() instead
 231          */
 232         switch (opcode) {
 233         case READ_10:
 234                 res = ps3rom_read_request(dev, cmd, srb10_lba(cmd),
 235                                           srb10_len(cmd));
 236                 break;
 237
 238         case WRITE_10:
 239                 res = ps3rom_write_request(dev, cmd, srb10_lba(cmd),
 240                                            srb10_len(cmd));
 241                 break;
 242
 243         default:
 244                 res = ps3rom_atapi_request(dev, cmd);
 245                 break;
 246         }
 247
 248         if (res) {
 249                 memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
 250                 cmd->result = res;
 251                 cmd->sense_buffer[0] = 0x70;
 252                 cmd->sense_buffer[2] = ILLEGAL_REQUEST;
 253                 priv->curr_cmd = NULL;
 254                 cmd->scsi_done(cmd);
 255         }
 256
 257         return 0;
 258 }
 259
 260 static DEF_SCSI_QCMD(ps3rom_queuecommand)
 261
 262 static int decode_lv1_status(u64 status, unsigned char *sense_key,
 263                              unsigned char *asc, unsigned char *ascq)
 264 {
 265         if (((status >> 24) & 0xff) != SAM_STAT_CHECK_CONDITION)
 266                 return -1;
 267
 268         *sense_key = (status >> 16) & 0xff;
 269         *asc       = (status >>  8) & 0xff;
 270         *ascq      =  status        & 0xff;
 271         return 0;
 272 }
 273
 274 static irqreturn_t ps3rom_interrupt(int irq, void *data)
 275 {
 276         struct ps3_storage_device *dev = data;
 277         struct Scsi_Host *host;
 278         struct ps3rom_private *priv;
 279         struct scsi_cmnd *cmd;
 280         int res;
 281         u64 tag, status;
 282         unsigned char sense_key, asc, ascq;
 283
 284         res = lv1_storage_get_async_status(dev->sbd.dev_id, &tag, &status);
 285         /*
 286          * status = -1 may mean that ATAPI transport completed OK, but
 287          * ATAPI command itself resulted CHECK CONDITION
 288          * so, upper layer should issue REQUEST_SENSE to check the sense data
 289          */
 290
 291         if (tag != dev->tag)
 292                 dev_err(&dev->sbd.core,
 293                         "%s:%u: tag mismatch, got %llx, expected %llx\n",
 294                         __func__, __LINE__, tag, dev->tag);
 295
 296         if (res) {
 297                 dev_err(&dev->sbd.core, "%s:%u: res=%d status=0x%llx\n",
 298                         __func__, __LINE__, res, status);
 299                 return IRQ_HANDLED;
 300         }
 301
 302         host = ps3_system_bus_get_drvdata(&dev->sbd);
 303         priv = shost_priv(host);
 304         cmd = priv->curr_cmd;
 305
 306         if (!status) {
 307                 /* OK, completed */
 308                 if (cmd->sc_data_direction == DMA_FROM_DEVICE) {
 309                         int len;
 310
 311                         len = scsi_sg_copy_from_buffer(cmd,
 312                                                        dev->bounce_buf,
 313                                                        dev->bounce_size);
 314
 315                         scsi_set_resid(cmd, scsi_bufflen(cmd) - len);
 316                 }
 317                 cmd->result = DID_OK << 16;
 318                 goto done;
 319         }
 320
 321         if (cmd->cmnd[0] == REQUEST_SENSE) {
 322                 /* SCSI spec says request sense should never get error */
 323                 dev_err(&dev->sbd.core, "%s:%u: end error without autosense\n",
 324                         __func__, __LINE__);
 325                 cmd->result = DID_ERROR << 16 | SAM_STAT_CHECK_CONDITION;
 326                 goto done;
 327         }
 328
 329         if (decode_lv1_status(status, &sense_key, &asc, &ascq)) {
 330                 cmd->result = DID_ERROR << 16;
 331                 goto done;
 332         }
 333
 334         scsi_build_sense_buffer(0, cmd->sense_buffer, sense_key, asc, ascq);
 335         cmd->result = SAM_STAT_CHECK_CONDITION;
 336
 337 done:
 338         priv->curr_cmd = NULL;
 339         cmd->scsi_done(cmd);
 340         return IRQ_HANDLED;
 341 }
 342
 343 static struct scsi_host_template ps3rom_host_template = {
 344         .name =                 DEVICE_NAME,
 345         .slave_configure =      ps3rom_slave_configure,
 346         .queuecommand =         ps3rom_queuecommand,
 347         .can_queue =            1,
 348         .this_id =              7,
 349         .sg_tablesize =         SG_ALL,
 350         .emulated =             1,              /* only sg driver uses this */
 351         .max_sectors =          PS3ROM_MAX_SECTORS,
 352         .module =               THIS_MODULE,
 353 };
 354
 355
 356 static int ps3rom_probe(struct ps3_system_bus_device *_dev)
 357 {
 358         struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
 359         int error;
 360         struct Scsi_Host *host;
 361         struct ps3rom_private *priv;
 362
 363         if (dev->blk_size != CD_FRAMESIZE) {
 364                 dev_err(&dev->sbd.core,
 365                         "%s:%u: cannot handle block size %llu\n", __func__,
 366                         __LINE__, dev->blk_size);
 367                 return -EINVAL;
 368         }
 369
 370         dev->bounce_size = BOUNCE_SIZE;
 371         dev->bounce_buf = kmalloc(BOUNCE_SIZE, GFP_DMA);
 372         if (!dev->bounce_buf)
 373                 return -ENOMEM;
 374
 375         error = ps3stor_setup(dev, ps3rom_interrupt);
 376         if (error)
 377                 goto fail_free_bounce;
 378
 379         host = scsi_host_alloc(&ps3rom_host_template,
 380                                sizeof(struct ps3rom_private));
 381         if (!host) {
 382                 dev_err(&dev->sbd.core, "%s:%u: scsi_host_alloc failed\n",
 383                         __func__, __LINE__);
 384                 error = -ENOMEM;
 385                 goto fail_teardown;
 386         }
 387
 388         priv = shost_priv(host);
 389         ps3_system_bus_set_drvdata(&dev->sbd, host);
 390         priv->dev = dev;
 391
 392         /* One device/LUN per SCSI bus */
 393         host->max_id = 1;
 394         host->max_lun = 1;
 395
 396         error = scsi_add_host(host, &dev->sbd.core);
 397         if (error) {
 398                 dev_err(&dev->sbd.core, "%s:%u: scsi_host_alloc failed %d\n",
 399                         __func__, __LINE__, error);
 400                 error = -ENODEV;
 401                 goto fail_host_put;
 402         }
 403
 404         scsi_scan_host(host);
 405         return 0;
 406
 407 fail_host_put:
 408         scsi_host_put(host);
 409         ps3_system_bus_set_drvdata(&dev->sbd, NULL);
 410 fail_teardown:
 411         ps3stor_teardown(dev);
 412 fail_free_bounce:
 413         kfree(dev->bounce_buf);
 414         return error;
 415 }
 416
 417 static int ps3rom_remove(struct ps3_system_bus_device *_dev)
 418 {
 419         struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
 420         struct Scsi_Host *host = ps3_system_bus_get_drvdata(&dev->sbd);
 421
 422         scsi_remove_host(host);
 423         ps3stor_teardown(dev);
 424         scsi_host_put(host);
 425         ps3_system_bus_set_drvdata(&dev->sbd, NULL);
 426         kfree(dev->bounce_buf);
 427         return 0;
 428 }
 429
 430 static struct ps3_system_bus_driver ps3rom = {
 431         .match_id       = PS3_MATCH_ID_STOR_ROM,
 432         .core.name      = DEVICE_NAME,
 433         .core.owner     = THIS_MODULE,
 434         .probe          = ps3rom_probe,
 435         .remove         = ps3rom_remove
 436 };
 437
 438
 439 static int __init ps3rom_init(void)
 440 {
 441         return ps3_system_bus_driver_register(&ps3rom);
 442 }
 443
 444 static void __exit ps3rom_exit(void)
 445 {
 446         ps3_system_bus_driver_unregister(&ps3rom);
 447 }
 448
 449 module_init(ps3rom_init);
 450 module_exit(ps3rom_exit);
 451
 452 MODULE_LICENSE("GPL");
 453 MODULE_DESCRIPTION("PS3 BD/DVD/CD-ROM Storage Driver");
 454 MODULE_AUTHOR("Sony Corporation");
 455 MODULE_ALIAS(PS3_MODULE_ALIAS_STOR_ROM);