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 #include <scsi/scsi_eh.h>
  30
  31 #include <asm/lv1call.h>
  32 #include <asm/ps3stor.h>
  33
  34
  35 #define DEVICE_NAME                     "ps3rom"
  36
  37 #define BOUNCE_SIZE                     (64*1024)
  38
  39 #define PS3ROM_MAX_SECTORS              (BOUNCE_SIZE >> 9)
  40
  41
  42 struct ps3rom_private {
  43         struct ps3_storage_device *dev;
  44         struct scsi_cmnd *curr_cmd;
  45 };
  46
  47
  48 #define LV1_STORAGE_SEND_ATAPI_COMMAND  (1)
  49
  50 struct lv1_atapi_cmnd_block {
  51         u8      pkt[32];        /* packet command block           */
  52         u32     pktlen;         /* should be 12 for ATAPI 8020    */
  53         u32     blocks;
  54         u32     block_size;
  55         u32     proto;          /* transfer mode                  */
  56         u32     in_out;         /* transfer direction             */
  57         u64     buffer;         /* parameter except command block */
  58         u32     arglen;         /* length above                   */
  59 };
  60
  61 enum lv1_atapi_proto {
  62         NON_DATA_PROTO     = 0,
  63         PIO_DATA_IN_PROTO  = 1,
  64         PIO_DATA_OUT_PROTO = 2,
  65         DMA_PROTO = 3
  66 };
  67
  68 enum lv1_atapi_in_out {
  69         DIR_WRITE = 0,          /* memory -> device */
  70         DIR_READ = 1            /* device -> memory */
  71 };
  72
  73
  74 static int ps3rom_slave_configure(struct scsi_device *scsi_dev)
  75 {
  76         struct ps3rom_private *priv = shost_priv(scsi_dev->host);
  77         struct ps3_storage_device *dev = priv->dev;
  78
  79         dev_dbg(&dev->sbd.core, "%s:%u: id %u, lun %u, channel %u\n", __func__,
  80                 __LINE__, scsi_dev->id, scsi_dev->lun, scsi_dev->channel);
  81
  82         /*
  83          * ATAPI SFF8020 devices use MODE_SENSE_10,
  84          * so we can prohibit MODE_SENSE_6
  85          */
  86         scsi_dev->use_10_for_ms = 1;
  87
  88         /* we don't support {READ,WRITE}_6 */
  89         scsi_dev->use_10_for_rw = 1;
  90
  91         return 0;
  92 }
  93
  94 static int ps3rom_atapi_request(struct ps3_storage_device *dev,
  95                                 struct scsi_cmnd *cmd)
  96 {
  97         struct lv1_atapi_cmnd_block atapi_cmnd;
  98         unsigned char opcode = cmd->cmnd[0];
  99         int res;
 100         u64 lpar;
 101
 102         dev_dbg(&dev->sbd.core, "%s:%u: send ATAPI command 0x%02x\n", __func__,
 103                 __LINE__, opcode);
 104
 105         memset(&atapi_cmnd, 0, sizeof(struct lv1_atapi_cmnd_block));
 106         memcpy(&atapi_cmnd.pkt, cmd->cmnd, 12);
 107         atapi_cmnd.pktlen = 12;
 108         atapi_cmnd.block_size = 1; /* transfer size is block_size * blocks */
 109         atapi_cmnd.blocks = atapi_cmnd.arglen = scsi_bufflen(cmd);
 110         atapi_cmnd.buffer = dev->bounce_lpar;
 111
 112         switch (cmd->sc_data_direction) {
 113         case DMA_FROM_DEVICE:
 114                 if (scsi_bufflen(cmd) >= CD_FRAMESIZE)
 115                         atapi_cmnd.proto = DMA_PROTO;
 116                 else
 117                         atapi_cmnd.proto = PIO_DATA_IN_PROTO;
 118                 atapi_cmnd.in_out = DIR_READ;
 119                 break;
 120
 121         case DMA_TO_DEVICE:
 122                 if (scsi_bufflen(cmd) >= CD_FRAMESIZE)
 123                         atapi_cmnd.proto = DMA_PROTO;
 124                 else
 125                         atapi_cmnd.proto = PIO_DATA_OUT_PROTO;
 126                 atapi_cmnd.in_out = DIR_WRITE;
 127                 scsi_sg_copy_to_buffer(cmd, dev->bounce_buf, dev->bounce_size);
 128                 break;
 129
 130         default:
 131                 atapi_cmnd.proto = NON_DATA_PROTO;
 132                 break;
 133         }
 134
 135         lpar = ps3_mm_phys_to_lpar(__pa(&atapi_cmnd));
 136         res = lv1_storage_send_device_command(dev->sbd.dev_id,
 137                                               LV1_STORAGE_SEND_ATAPI_COMMAND,
 138                                               lpar, sizeof(atapi_cmnd),
 139                                               atapi_cmnd.buffer,
 140                                               atapi_cmnd.arglen, &dev->tag);
 141         if (res == LV1_DENIED_BY_POLICY) {
 142                 dev_dbg(&dev->sbd.core,
 143                         "%s:%u: ATAPI command 0x%02x denied by policy\n",
 144                         __func__, __LINE__, opcode);
 145                 return DID_ERROR << 16;
 146         }
 147
 148         if (res) {
 149                 dev_err(&dev->sbd.core,
 150                         "%s:%u: ATAPI command 0x%02x failed %d\n", __func__,
 151                         __LINE__, opcode, res);
 152                 return DID_ERROR << 16;
 153         }
 154
 155         return 0;
 156 }
 157
 158 static inline unsigned int srb10_lba(const struct scsi_cmnd *cmd)
 159 {
 160         return cmd->cmnd[2] << 24 | cmd->cmnd[3] << 16 | cmd->cmnd[4] << 8 |
 161                cmd->cmnd[5];
 162 }
 163
 164 static inline unsigned int srb10_len(const struct scsi_cmnd *cmd)
 165 {
 166         return cmd->cmnd[7] << 8 | cmd->cmnd[8];
 167 }
 168
 169 static int ps3rom_read_request(struct ps3_storage_device *dev,
 170                                struct scsi_cmnd *cmd, u32 start_sector,
 171                                u32 sectors)
 172 {
 173         int res;
 174
 175         dev_dbg(&dev->sbd.core, "%s:%u: read %u sectors starting at %u\n",
 176                 __func__, __LINE__, sectors, start_sector);
 177
 178         res = lv1_storage_read(dev->sbd.dev_id,
 179                                dev->regions[dev->region_idx].id, start_sector,
 180                                sectors, 0, dev->bounce_lpar, &dev->tag);
 181         if (res) {
 182                 dev_err(&dev->sbd.core, "%s:%u: read failed %d\n", __func__,
 183                         __LINE__, res);
 184                 return DID_ERROR << 16;
 185         }
 186
 187         return 0;
 188 }
 189
 190 static int ps3rom_write_request(struct ps3_storage_device *dev,
 191                                 struct scsi_cmnd *cmd, u32 start_sector,
 192                                 u32 sectors)
 193 {
 194         int res;
 195
 196         dev_dbg(&dev->sbd.core, "%s:%u: write %u sectors starting at %u\n",
 197                 __func__, __LINE__, sectors, start_sector);
 198
 199         scsi_sg_copy_to_buffer(cmd, dev->bounce_buf, dev->bounce_size);
 200
 201         res = lv1_storage_write(dev->sbd.dev_id,
 202                                 dev->regions[dev->region_idx].id, start_sector,
 203                                 sectors, 0, dev->bounce_lpar, &dev->tag);
 204         if (res) {
 205                 dev_err(&dev->sbd.core, "%s:%u: write failed %d\n", __func__,
 206                         __LINE__, res);
 207                 return DID_ERROR << 16;
 208         }
 209
 210         return 0;
 211 }
 212
 213 static int ps3rom_queuecommand(struct scsi_cmnd *cmd,
 214                                void (*done)(struct scsi_cmnd *))
 215 {
 216         struct ps3rom_private *priv = shost_priv(cmd->device->host);
 217         struct ps3_storage_device *dev = priv->dev;
 218         unsigned char opcode;
 219         int res;
 220
 221 #ifdef DEBUG
 222         scsi_print_command(cmd);
 223 #endif
 224
 225         priv->curr_cmd = cmd;
 226         cmd->scsi_done = done;
 227
 228         opcode = cmd->cmnd[0];
 229         /*
 230          * While we can submit READ/WRITE SCSI commands as ATAPI commands,
 231          * it's recommended for various reasons (performance, error handling,
 232          * ...) to use lv1_storage_{read,write}() instead
 233          */
 234         switch (opcode) {
 235         case READ_10:
 236                 res = ps3rom_read_request(dev, cmd, srb10_lba(cmd),
 237                                           srb10_len(cmd));
 238                 break;
 239
 240         case WRITE_10:
 241                 res = ps3rom_write_request(dev, cmd, srb10_lba(cmd),
 242                                            srb10_len(cmd));
 243                 break;
 244
 245         default:
 246                 res = ps3rom_atapi_request(dev, cmd);
 247                 break;
 248         }
 249
 250         if (res) {
 251                 memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
 252                 cmd->result = res;
 253                 cmd->sense_buffer[0] = 0x70;
 254                 cmd->sense_buffer[2] = ILLEGAL_REQUEST;
 255                 priv->curr_cmd = NULL;
 256                 cmd->scsi_done(cmd);
 257         }
 258
 259         return 0;
 260 }
 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 = dev->sbd.core.driver_data;
 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         .cmd_per_lun =          1,
 351         .emulated =             1,              /* only sg driver uses this */
 352         .max_sectors =          PS3ROM_MAX_SECTORS,
 353         .use_clustering =       ENABLE_CLUSTERING,
 354         .module =               THIS_MODULE,
 355 };
 356
 357
 358 static int __devinit ps3rom_probe(struct ps3_system_bus_device *_dev)
 359 {
 360         struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
 361         int error;
 362         struct Scsi_Host *host;
 363         struct ps3rom_private *priv;
 364
 365         if (dev->blk_size != CD_FRAMESIZE) {
 366                 dev_err(&dev->sbd.core,
 367                         "%s:%u: cannot handle block size %llu\n", __func__,
 368                         __LINE__, dev->blk_size);
 369                 return -EINVAL;
 370         }
 371
 372         dev->bounce_size = BOUNCE_SIZE;
 373         dev->bounce_buf = kmalloc(BOUNCE_SIZE, GFP_DMA);
 374         if (!dev->bounce_buf)
 375                 return -ENOMEM;
 376
 377         error = ps3stor_setup(dev, ps3rom_interrupt);
 378         if (error)
 379                 goto fail_free_bounce;
 380
 381         host = scsi_host_alloc(&ps3rom_host_template,
 382                                sizeof(struct ps3rom_private));
 383         if (!host) {
 384                 dev_err(&dev->sbd.core, "%s:%u: scsi_host_alloc failed\n",
 385                         __func__, __LINE__);
 386                 goto fail_teardown;
 387         }
 388
 389         priv = shost_priv(host);
 390         dev->sbd.core.driver_data = host;
 391         priv->dev = dev;
 392
 393         /* One device/LUN per SCSI bus */
 394         host->max_id = 1;
 395         host->max_lun = 1;
 396
 397         error = scsi_add_host(host, &dev->sbd.core);
 398         if (error) {
 399                 dev_err(&dev->sbd.core, "%s:%u: scsi_host_alloc failed %d\n",
 400                         __func__, __LINE__, error);
 401                 error = -ENODEV;
 402                 goto fail_host_put;
 403         }
 404
 405         scsi_scan_host(host);
 406         return 0;
 407
 408 fail_host_put:
 409         scsi_host_put(host);
 410         dev->sbd.core.driver_data = NULL;
 411 fail_teardown:
 412         ps3stor_teardown(dev);
 413 fail_free_bounce:
 414         kfree(dev->bounce_buf);
 415         return error;
 416 }
 417
 418 static int ps3rom_remove(struct ps3_system_bus_device *_dev)
 419 {
 420         struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
 421         struct Scsi_Host *host = dev->sbd.core.driver_data;
 422
 423         scsi_remove_host(host);
 424         ps3stor_teardown(dev);
 425         scsi_host_put(host);
 426         dev->sbd.core.driver_data = NULL;
 427         kfree(dev->bounce_buf);
 428         return 0;
 429 }
 430
 431 static struct ps3_system_bus_driver ps3rom = {
 432         .match_id       = PS3_MATCH_ID_STOR_ROM,
 433         .core.name      = DEVICE_NAME,
 434         .core.owner     = THIS_MODULE,
 435         .probe          = ps3rom_probe,
 436         .remove         = ps3rom_remove
 437 };
 438
 439
 440 static int __init ps3rom_init(void)
 441 {
 442         return ps3_system_bus_driver_register(&ps3rom);
 443 }
 444
 445 static void __exit ps3rom_exit(void)
 446 {
 447         ps3_system_bus_driver_unregister(&ps3rom);
 448 }
 449
 450 module_init(ps3rom_init);
 451 module_exit(ps3rom_exit);
 452
 453 MODULE_LICENSE("GPL");
 454 MODULE_DESCRIPTION("PS3 BD/DVD/CD-ROM Storage Driver");
 455 MODULE_AUTHOR("Sony Corporation");
 456 MODULE_ALIAS(PS3_MODULE_ALIAS_STOR_ROM);