| 1 | /* |
| 2 | * ATAPI support. |
| 3 | */ |
| 4 | |
| 5 | #include <linux/kernel.h> |
| 6 | #include <linux/cdrom.h> |
| 7 | #include <linux/delay.h> |
| 8 | #include <linux/export.h> |
| 9 | #include <linux/ide.h> |
| 10 | #include <linux/scatterlist.h> |
| 11 | #include <linux/gfp.h> |
| 12 | |
| 13 | #include <scsi/scsi.h> |
| 14 | |
| 15 | #define DRV_NAME "ide-atapi" |
| 16 | #define PFX DRV_NAME ": " |
| 17 | |
| 18 | #ifdef DEBUG |
| 19 | #define debug_log(fmt, args...) \ |
| 20 | printk(KERN_INFO "ide: " fmt, ## args) |
| 21 | #else |
| 22 | #define debug_log(fmt, args...) do {} while (0) |
| 23 | #endif |
| 24 | |
| 25 | #define ATAPI_MIN_CDB_BYTES 12 |
| 26 | |
| 27 | static inline int dev_is_idecd(ide_drive_t *drive) |
| 28 | { |
| 29 | return drive->media == ide_cdrom || drive->media == ide_optical; |
| 30 | } |
| 31 | |
| 32 | /* |
| 33 | * Check whether we can support a device, |
| 34 | * based on the ATAPI IDENTIFY command results. |
| 35 | */ |
| 36 | int ide_check_atapi_device(ide_drive_t *drive, const char *s) |
| 37 | { |
| 38 | u16 *id = drive->id; |
| 39 | u8 gcw[2], protocol, device_type, removable, drq_type, packet_size; |
| 40 | |
| 41 | *((u16 *)&gcw) = id[ATA_ID_CONFIG]; |
| 42 | |
| 43 | protocol = (gcw[1] & 0xC0) >> 6; |
| 44 | device_type = gcw[1] & 0x1F; |
| 45 | removable = (gcw[0] & 0x80) >> 7; |
| 46 | drq_type = (gcw[0] & 0x60) >> 5; |
| 47 | packet_size = gcw[0] & 0x03; |
| 48 | |
| 49 | #ifdef CONFIG_PPC |
| 50 | /* kludge for Apple PowerBook internal zip */ |
| 51 | if (drive->media == ide_floppy && device_type == 5 && |
| 52 | !strstr((char *)&id[ATA_ID_PROD], "CD-ROM") && |
| 53 | strstr((char *)&id[ATA_ID_PROD], "ZIP")) |
| 54 | device_type = 0; |
| 55 | #endif |
| 56 | |
| 57 | if (protocol != 2) |
| 58 | printk(KERN_ERR "%s: %s: protocol (0x%02x) is not ATAPI\n", |
| 59 | s, drive->name, protocol); |
| 60 | else if ((drive->media == ide_floppy && device_type != 0) || |
| 61 | (drive->media == ide_tape && device_type != 1)) |
| 62 | printk(KERN_ERR "%s: %s: invalid device type (0x%02x)\n", |
| 63 | s, drive->name, device_type); |
| 64 | else if (removable == 0) |
| 65 | printk(KERN_ERR "%s: %s: the removable flag is not set\n", |
| 66 | s, drive->name); |
| 67 | else if (drive->media == ide_floppy && drq_type == 3) |
| 68 | printk(KERN_ERR "%s: %s: sorry, DRQ type (0x%02x) not " |
| 69 | "supported\n", s, drive->name, drq_type); |
| 70 | else if (packet_size != 0) |
| 71 | printk(KERN_ERR "%s: %s: packet size (0x%02x) is not 12 " |
| 72 | "bytes\n", s, drive->name, packet_size); |
| 73 | else |
| 74 | return 1; |
| 75 | return 0; |
| 76 | } |
| 77 | EXPORT_SYMBOL_GPL(ide_check_atapi_device); |
| 78 | |
| 79 | void ide_init_pc(struct ide_atapi_pc *pc) |
| 80 | { |
| 81 | memset(pc, 0, sizeof(*pc)); |
| 82 | } |
| 83 | EXPORT_SYMBOL_GPL(ide_init_pc); |
| 84 | |
| 85 | /* |
| 86 | * Add a special packet command request to the tail of the request queue, |
| 87 | * and wait for it to be serviced. |
| 88 | */ |
| 89 | int ide_queue_pc_tail(ide_drive_t *drive, struct gendisk *disk, |
| 90 | struct ide_atapi_pc *pc, void *buf, unsigned int bufflen) |
| 91 | { |
| 92 | struct request *rq; |
| 93 | int error; |
| 94 | |
| 95 | rq = blk_get_request(drive->queue, REQ_OP_DRV_IN, __GFP_RECLAIM); |
| 96 | scsi_req_init(rq); |
| 97 | ide_req(rq)->type = ATA_PRIV_MISC; |
| 98 | rq->special = (char *)pc; |
| 99 | |
| 100 | if (buf && bufflen) { |
| 101 | error = blk_rq_map_kern(drive->queue, rq, buf, bufflen, |
| 102 | GFP_NOIO); |
| 103 | if (error) |
| 104 | goto put_req; |
| 105 | } |
| 106 | |
| 107 | memcpy(scsi_req(rq)->cmd, pc->c, 12); |
| 108 | if (drive->media == ide_tape) |
| 109 | scsi_req(rq)->cmd[13] = REQ_IDETAPE_PC1; |
| 110 | blk_execute_rq(drive->queue, disk, rq, 0); |
| 111 | error = scsi_req(rq)->result ? -EIO : 0; |
| 112 | put_req: |
| 113 | blk_put_request(rq); |
| 114 | return error; |
| 115 | } |
| 116 | EXPORT_SYMBOL_GPL(ide_queue_pc_tail); |
| 117 | |
| 118 | int ide_do_test_unit_ready(ide_drive_t *drive, struct gendisk *disk) |
| 119 | { |
| 120 | struct ide_atapi_pc pc; |
| 121 | |
| 122 | ide_init_pc(&pc); |
| 123 | pc.c[0] = TEST_UNIT_READY; |
| 124 | |
| 125 | return ide_queue_pc_tail(drive, disk, &pc, NULL, 0); |
| 126 | } |
| 127 | EXPORT_SYMBOL_GPL(ide_do_test_unit_ready); |
| 128 | |
| 129 | int ide_do_start_stop(ide_drive_t *drive, struct gendisk *disk, int start) |
| 130 | { |
| 131 | struct ide_atapi_pc pc; |
| 132 | |
| 133 | ide_init_pc(&pc); |
| 134 | pc.c[0] = START_STOP; |
| 135 | pc.c[4] = start; |
| 136 | |
| 137 | if (drive->media == ide_tape) |
| 138 | pc.flags |= PC_FLAG_WAIT_FOR_DSC; |
| 139 | |
| 140 | return ide_queue_pc_tail(drive, disk, &pc, NULL, 0); |
| 141 | } |
| 142 | EXPORT_SYMBOL_GPL(ide_do_start_stop); |
| 143 | |
| 144 | int ide_set_media_lock(ide_drive_t *drive, struct gendisk *disk, int on) |
| 145 | { |
| 146 | struct ide_atapi_pc pc; |
| 147 | |
| 148 | if ((drive->dev_flags & IDE_DFLAG_DOORLOCKING) == 0) |
| 149 | return 0; |
| 150 | |
| 151 | ide_init_pc(&pc); |
| 152 | pc.c[0] = ALLOW_MEDIUM_REMOVAL; |
| 153 | pc.c[4] = on; |
| 154 | |
| 155 | return ide_queue_pc_tail(drive, disk, &pc, NULL, 0); |
| 156 | } |
| 157 | EXPORT_SYMBOL_GPL(ide_set_media_lock); |
| 158 | |
| 159 | void ide_create_request_sense_cmd(ide_drive_t *drive, struct ide_atapi_pc *pc) |
| 160 | { |
| 161 | ide_init_pc(pc); |
| 162 | pc->c[0] = REQUEST_SENSE; |
| 163 | if (drive->media == ide_floppy) { |
| 164 | pc->c[4] = 255; |
| 165 | pc->req_xfer = 18; |
| 166 | } else { |
| 167 | pc->c[4] = 20; |
| 168 | pc->req_xfer = 20; |
| 169 | } |
| 170 | } |
| 171 | EXPORT_SYMBOL_GPL(ide_create_request_sense_cmd); |
| 172 | |
| 173 | void ide_prep_sense(ide_drive_t *drive, struct request *rq) |
| 174 | { |
| 175 | struct request_sense *sense = &drive->sense_data; |
| 176 | struct request *sense_rq = drive->sense_rq; |
| 177 | struct scsi_request *req = scsi_req(sense_rq); |
| 178 | unsigned int cmd_len, sense_len; |
| 179 | int err; |
| 180 | |
| 181 | switch (drive->media) { |
| 182 | case ide_floppy: |
| 183 | cmd_len = 255; |
| 184 | sense_len = 18; |
| 185 | break; |
| 186 | case ide_tape: |
| 187 | cmd_len = 20; |
| 188 | sense_len = 20; |
| 189 | break; |
| 190 | default: |
| 191 | cmd_len = 18; |
| 192 | sense_len = 18; |
| 193 | } |
| 194 | |
| 195 | BUG_ON(sense_len > sizeof(*sense)); |
| 196 | |
| 197 | if (ata_sense_request(rq) || drive->sense_rq_armed) |
| 198 | return; |
| 199 | |
| 200 | memset(sense, 0, sizeof(*sense)); |
| 201 | |
| 202 | blk_rq_init(rq->q, sense_rq); |
| 203 | scsi_req_init(sense_rq); |
| 204 | |
| 205 | err = blk_rq_map_kern(drive->queue, sense_rq, sense, sense_len, |
| 206 | GFP_NOIO); |
| 207 | if (unlikely(err)) { |
| 208 | if (printk_ratelimit()) |
| 209 | printk(KERN_WARNING PFX "%s: failed to map sense " |
| 210 | "buffer\n", drive->name); |
| 211 | return; |
| 212 | } |
| 213 | |
| 214 | sense_rq->rq_disk = rq->rq_disk; |
| 215 | sense_rq->cmd_flags = REQ_OP_DRV_IN; |
| 216 | ide_req(sense_rq)->type = ATA_PRIV_SENSE; |
| 217 | sense_rq->rq_flags |= RQF_PREEMPT; |
| 218 | |
| 219 | req->cmd[0] = GPCMD_REQUEST_SENSE; |
| 220 | req->cmd[4] = cmd_len; |
| 221 | if (drive->media == ide_tape) |
| 222 | req->cmd[13] = REQ_IDETAPE_PC1; |
| 223 | |
| 224 | drive->sense_rq_armed = true; |
| 225 | } |
| 226 | EXPORT_SYMBOL_GPL(ide_prep_sense); |
| 227 | |
| 228 | int ide_queue_sense_rq(ide_drive_t *drive, void *special) |
| 229 | { |
| 230 | /* deferred failure from ide_prep_sense() */ |
| 231 | if (!drive->sense_rq_armed) { |
| 232 | printk(KERN_WARNING PFX "%s: error queuing a sense request\n", |
| 233 | drive->name); |
| 234 | return -ENOMEM; |
| 235 | } |
| 236 | |
| 237 | drive->sense_rq->special = special; |
| 238 | drive->sense_rq_armed = false; |
| 239 | |
| 240 | drive->hwif->rq = NULL; |
| 241 | |
| 242 | elv_add_request(drive->queue, drive->sense_rq, ELEVATOR_INSERT_FRONT); |
| 243 | return 0; |
| 244 | } |
| 245 | EXPORT_SYMBOL_GPL(ide_queue_sense_rq); |
| 246 | |
| 247 | /* |
| 248 | * Called when an error was detected during the last packet command. |
| 249 | * We queue a request sense packet command at the head of the request |
| 250 | * queue. |
| 251 | */ |
| 252 | void ide_retry_pc(ide_drive_t *drive) |
| 253 | { |
| 254 | struct request *failed_rq = drive->hwif->rq; |
| 255 | struct request *sense_rq = drive->sense_rq; |
| 256 | struct ide_atapi_pc *pc = &drive->request_sense_pc; |
| 257 | |
| 258 | (void)ide_read_error(drive); |
| 259 | |
| 260 | /* init pc from sense_rq */ |
| 261 | ide_init_pc(pc); |
| 262 | memcpy(pc->c, scsi_req(sense_rq)->cmd, 12); |
| 263 | |
| 264 | if (drive->media == ide_tape) |
| 265 | drive->atapi_flags |= IDE_AFLAG_IGNORE_DSC; |
| 266 | |
| 267 | /* |
| 268 | * Push back the failed request and put request sense on top |
| 269 | * of it. The failed command will be retried after sense data |
| 270 | * is acquired. |
| 271 | */ |
| 272 | drive->hwif->rq = NULL; |
| 273 | ide_requeue_and_plug(drive, failed_rq); |
| 274 | if (ide_queue_sense_rq(drive, pc)) { |
| 275 | blk_start_request(failed_rq); |
| 276 | ide_complete_rq(drive, -EIO, blk_rq_bytes(failed_rq)); |
| 277 | } |
| 278 | } |
| 279 | EXPORT_SYMBOL_GPL(ide_retry_pc); |
| 280 | |
| 281 | int ide_cd_expiry(ide_drive_t *drive) |
| 282 | { |
| 283 | struct request *rq = drive->hwif->rq; |
| 284 | unsigned long wait = 0; |
| 285 | |
| 286 | debug_log("%s: rq->cmd[0]: 0x%x\n", __func__, rq->cmd[0]); |
| 287 | |
| 288 | /* |
| 289 | * Some commands are *slow* and normally take a long time to complete. |
| 290 | * Usually we can use the ATAPI "disconnect" to bypass this, but not all |
| 291 | * commands/drives support that. Let ide_timer_expiry keep polling us |
| 292 | * for these. |
| 293 | */ |
| 294 | switch (scsi_req(rq)->cmd[0]) { |
| 295 | case GPCMD_BLANK: |
| 296 | case GPCMD_FORMAT_UNIT: |
| 297 | case GPCMD_RESERVE_RZONE_TRACK: |
| 298 | case GPCMD_CLOSE_TRACK: |
| 299 | case GPCMD_FLUSH_CACHE: |
| 300 | wait = ATAPI_WAIT_PC; |
| 301 | break; |
| 302 | default: |
| 303 | if (!(rq->rq_flags & RQF_QUIET)) |
| 304 | printk(KERN_INFO PFX "cmd 0x%x timed out\n", |
| 305 | scsi_req(rq)->cmd[0]); |
| 306 | wait = 0; |
| 307 | break; |
| 308 | } |
| 309 | return wait; |
| 310 | } |
| 311 | EXPORT_SYMBOL_GPL(ide_cd_expiry); |
| 312 | |
| 313 | int ide_cd_get_xferlen(struct request *rq) |
| 314 | { |
| 315 | switch (req_op(rq)) { |
| 316 | default: |
| 317 | return 32768; |
| 318 | case REQ_OP_SCSI_IN: |
| 319 | case REQ_OP_SCSI_OUT: |
| 320 | return blk_rq_bytes(rq); |
| 321 | case REQ_OP_DRV_IN: |
| 322 | case REQ_OP_DRV_OUT: |
| 323 | switch (ide_req(rq)->type) { |
| 324 | case ATA_PRIV_PC: |
| 325 | case ATA_PRIV_SENSE: |
| 326 | return blk_rq_bytes(rq); |
| 327 | default: |
| 328 | return 0; |
| 329 | } |
| 330 | } |
| 331 | } |
| 332 | EXPORT_SYMBOL_GPL(ide_cd_get_xferlen); |
| 333 | |
| 334 | void ide_read_bcount_and_ireason(ide_drive_t *drive, u16 *bcount, u8 *ireason) |
| 335 | { |
| 336 | struct ide_taskfile tf; |
| 337 | |
| 338 | drive->hwif->tp_ops->tf_read(drive, &tf, IDE_VALID_NSECT | |
| 339 | IDE_VALID_LBAM | IDE_VALID_LBAH); |
| 340 | |
| 341 | *bcount = (tf.lbah << 8) | tf.lbam; |
| 342 | *ireason = tf.nsect & 3; |
| 343 | } |
| 344 | EXPORT_SYMBOL_GPL(ide_read_bcount_and_ireason); |
| 345 | |
| 346 | /* |
| 347 | * Check the contents of the interrupt reason register and attempt to recover if |
| 348 | * there are problems. |
| 349 | * |
| 350 | * Returns: |
| 351 | * - 0 if everything's ok |
| 352 | * - 1 if the request has to be terminated. |
| 353 | */ |
| 354 | int ide_check_ireason(ide_drive_t *drive, struct request *rq, int len, |
| 355 | int ireason, int rw) |
| 356 | { |
| 357 | ide_hwif_t *hwif = drive->hwif; |
| 358 | |
| 359 | debug_log("ireason: 0x%x, rw: 0x%x\n", ireason, rw); |
| 360 | |
| 361 | if (ireason == (!rw << 1)) |
| 362 | return 0; |
| 363 | else if (ireason == (rw << 1)) { |
| 364 | printk(KERN_ERR PFX "%s: %s: wrong transfer direction!\n", |
| 365 | drive->name, __func__); |
| 366 | |
| 367 | if (dev_is_idecd(drive)) |
| 368 | ide_pad_transfer(drive, rw, len); |
| 369 | } else if (!rw && ireason == ATAPI_COD) { |
| 370 | if (dev_is_idecd(drive)) { |
| 371 | /* |
| 372 | * Some drives (ASUS) seem to tell us that status info |
| 373 | * is available. Just get it and ignore. |
| 374 | */ |
| 375 | (void)hwif->tp_ops->read_status(hwif); |
| 376 | return 0; |
| 377 | } |
| 378 | } else { |
| 379 | if (ireason & ATAPI_COD) |
| 380 | printk(KERN_ERR PFX "%s: CoD != 0 in %s\n", drive->name, |
| 381 | __func__); |
| 382 | |
| 383 | /* drive wants a command packet, or invalid ireason... */ |
| 384 | printk(KERN_ERR PFX "%s: %s: bad interrupt reason 0x%02x\n", |
| 385 | drive->name, __func__, ireason); |
| 386 | } |
| 387 | |
| 388 | if (dev_is_idecd(drive) && ata_pc_request(rq)) |
| 389 | rq->rq_flags |= RQF_FAILED; |
| 390 | |
| 391 | return 1; |
| 392 | } |
| 393 | EXPORT_SYMBOL_GPL(ide_check_ireason); |
| 394 | |
| 395 | /* |
| 396 | * This is the usual interrupt handler which will be called during a packet |
| 397 | * command. We will transfer some of the data (as requested by the drive) |
| 398 | * and will re-point interrupt handler to us. |
| 399 | */ |
| 400 | static ide_startstop_t ide_pc_intr(ide_drive_t *drive) |
| 401 | { |
| 402 | struct ide_atapi_pc *pc = drive->pc; |
| 403 | ide_hwif_t *hwif = drive->hwif; |
| 404 | struct ide_cmd *cmd = &hwif->cmd; |
| 405 | struct request *rq = hwif->rq; |
| 406 | const struct ide_tp_ops *tp_ops = hwif->tp_ops; |
| 407 | unsigned int timeout, done; |
| 408 | u16 bcount; |
| 409 | u8 stat, ireason, dsc = 0; |
| 410 | u8 write = !!(pc->flags & PC_FLAG_WRITING); |
| 411 | |
| 412 | debug_log("Enter %s - interrupt handler\n", __func__); |
| 413 | |
| 414 | timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD |
| 415 | : WAIT_TAPE_CMD; |
| 416 | |
| 417 | /* Clear the interrupt */ |
| 418 | stat = tp_ops->read_status(hwif); |
| 419 | |
| 420 | if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) { |
| 421 | int rc; |
| 422 | |
| 423 | drive->waiting_for_dma = 0; |
| 424 | rc = hwif->dma_ops->dma_end(drive); |
| 425 | ide_dma_unmap_sg(drive, cmd); |
| 426 | |
| 427 | if (rc || (drive->media == ide_tape && (stat & ATA_ERR))) { |
| 428 | if (drive->media == ide_floppy) |
| 429 | printk(KERN_ERR PFX "%s: DMA %s error\n", |
| 430 | drive->name, rq_data_dir(pc->rq) |
| 431 | ? "write" : "read"); |
| 432 | pc->flags |= PC_FLAG_DMA_ERROR; |
| 433 | } else |
| 434 | scsi_req(rq)->resid_len = 0; |
| 435 | debug_log("%s: DMA finished\n", drive->name); |
| 436 | } |
| 437 | |
| 438 | /* No more interrupts */ |
| 439 | if ((stat & ATA_DRQ) == 0) { |
| 440 | int uptodate, error; |
| 441 | |
| 442 | debug_log("Packet command completed, %d bytes transferred\n", |
| 443 | blk_rq_bytes(rq)); |
| 444 | |
| 445 | pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS; |
| 446 | |
| 447 | local_irq_enable_in_hardirq(); |
| 448 | |
| 449 | if (drive->media == ide_tape && |
| 450 | (stat & ATA_ERR) && scsi_req(rq)->cmd[0] == REQUEST_SENSE) |
| 451 | stat &= ~ATA_ERR; |
| 452 | |
| 453 | if ((stat & ATA_ERR) || (pc->flags & PC_FLAG_DMA_ERROR)) { |
| 454 | /* Error detected */ |
| 455 | debug_log("%s: I/O error\n", drive->name); |
| 456 | |
| 457 | if (drive->media != ide_tape) |
| 458 | scsi_req(pc->rq)->result++; |
| 459 | |
| 460 | if (scsi_req(rq)->cmd[0] == REQUEST_SENSE) { |
| 461 | printk(KERN_ERR PFX "%s: I/O error in request " |
| 462 | "sense command\n", drive->name); |
| 463 | return ide_do_reset(drive); |
| 464 | } |
| 465 | |
| 466 | debug_log("[cmd %x]: check condition\n", rq->cmd[0]); |
| 467 | |
| 468 | /* Retry operation */ |
| 469 | ide_retry_pc(drive); |
| 470 | |
| 471 | /* queued, but not started */ |
| 472 | return ide_stopped; |
| 473 | } |
| 474 | pc->error = 0; |
| 475 | |
| 476 | if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) && (stat & ATA_DSC) == 0) |
| 477 | dsc = 1; |
| 478 | |
| 479 | /* |
| 480 | * ->pc_callback() might change rq->data_len for |
| 481 | * residual count, cache total length. |
| 482 | */ |
| 483 | done = blk_rq_bytes(rq); |
| 484 | |
| 485 | /* Command finished - Call the callback function */ |
| 486 | uptodate = drive->pc_callback(drive, dsc); |
| 487 | |
| 488 | if (uptodate == 0) |
| 489 | drive->failed_pc = NULL; |
| 490 | |
| 491 | if (ata_misc_request(rq)) { |
| 492 | scsi_req(rq)->result = 0; |
| 493 | error = 0; |
| 494 | } else { |
| 495 | |
| 496 | if (blk_rq_is_passthrough(rq) && uptodate <= 0) { |
| 497 | if (scsi_req(rq)->result == 0) |
| 498 | scsi_req(rq)->result = -EIO; |
| 499 | } |
| 500 | |
| 501 | error = uptodate ? 0 : -EIO; |
| 502 | } |
| 503 | |
| 504 | ide_complete_rq(drive, error, blk_rq_bytes(rq)); |
| 505 | return ide_stopped; |
| 506 | } |
| 507 | |
| 508 | if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) { |
| 509 | pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS; |
| 510 | printk(KERN_ERR PFX "%s: The device wants to issue more " |
| 511 | "interrupts in DMA mode\n", drive->name); |
| 512 | ide_dma_off(drive); |
| 513 | return ide_do_reset(drive); |
| 514 | } |
| 515 | |
| 516 | /* Get the number of bytes to transfer on this interrupt. */ |
| 517 | ide_read_bcount_and_ireason(drive, &bcount, &ireason); |
| 518 | |
| 519 | if (ide_check_ireason(drive, rq, bcount, ireason, write)) |
| 520 | return ide_do_reset(drive); |
| 521 | |
| 522 | done = min_t(unsigned int, bcount, cmd->nleft); |
| 523 | ide_pio_bytes(drive, cmd, write, done); |
| 524 | |
| 525 | /* Update transferred byte count */ |
| 526 | scsi_req(rq)->resid_len -= done; |
| 527 | |
| 528 | bcount -= done; |
| 529 | |
| 530 | if (bcount) |
| 531 | ide_pad_transfer(drive, write, bcount); |
| 532 | |
| 533 | debug_log("[cmd %x] transferred %d bytes, padded %d bytes, resid: %u\n", |
| 534 | rq->cmd[0], done, bcount, scsi_req(rq)->resid_len); |
| 535 | |
| 536 | /* And set the interrupt handler again */ |
| 537 | ide_set_handler(drive, ide_pc_intr, timeout); |
| 538 | return ide_started; |
| 539 | } |
| 540 | |
| 541 | static void ide_init_packet_cmd(struct ide_cmd *cmd, u8 valid_tf, |
| 542 | u16 bcount, u8 dma) |
| 543 | { |
| 544 | cmd->protocol = dma ? ATAPI_PROT_DMA : ATAPI_PROT_PIO; |
| 545 | cmd->valid.out.tf = IDE_VALID_LBAH | IDE_VALID_LBAM | |
| 546 | IDE_VALID_FEATURE | valid_tf; |
| 547 | cmd->tf.command = ATA_CMD_PACKET; |
| 548 | cmd->tf.feature = dma; /* Use PIO/DMA */ |
| 549 | cmd->tf.lbam = bcount & 0xff; |
| 550 | cmd->tf.lbah = (bcount >> 8) & 0xff; |
| 551 | } |
| 552 | |
| 553 | static u8 ide_read_ireason(ide_drive_t *drive) |
| 554 | { |
| 555 | struct ide_taskfile tf; |
| 556 | |
| 557 | drive->hwif->tp_ops->tf_read(drive, &tf, IDE_VALID_NSECT); |
| 558 | |
| 559 | return tf.nsect & 3; |
| 560 | } |
| 561 | |
| 562 | static u8 ide_wait_ireason(ide_drive_t *drive, u8 ireason) |
| 563 | { |
| 564 | int retries = 100; |
| 565 | |
| 566 | while (retries-- && ((ireason & ATAPI_COD) == 0 || |
| 567 | (ireason & ATAPI_IO))) { |
| 568 | printk(KERN_ERR PFX "%s: (IO,CoD != (0,1) while issuing " |
| 569 | "a packet command, retrying\n", drive->name); |
| 570 | udelay(100); |
| 571 | ireason = ide_read_ireason(drive); |
| 572 | if (retries == 0) { |
| 573 | printk(KERN_ERR PFX "%s: (IO,CoD != (0,1) while issuing" |
| 574 | " a packet command, ignoring\n", |
| 575 | drive->name); |
| 576 | ireason |= ATAPI_COD; |
| 577 | ireason &= ~ATAPI_IO; |
| 578 | } |
| 579 | } |
| 580 | |
| 581 | return ireason; |
| 582 | } |
| 583 | |
| 584 | static int ide_delayed_transfer_pc(ide_drive_t *drive) |
| 585 | { |
| 586 | /* Send the actual packet */ |
| 587 | drive->hwif->tp_ops->output_data(drive, NULL, drive->pc->c, 12); |
| 588 | |
| 589 | /* Timeout for the packet command */ |
| 590 | return WAIT_FLOPPY_CMD; |
| 591 | } |
| 592 | |
| 593 | static ide_startstop_t ide_transfer_pc(ide_drive_t *drive) |
| 594 | { |
| 595 | struct ide_atapi_pc *uninitialized_var(pc); |
| 596 | ide_hwif_t *hwif = drive->hwif; |
| 597 | struct request *rq = hwif->rq; |
| 598 | ide_expiry_t *expiry; |
| 599 | unsigned int timeout; |
| 600 | int cmd_len; |
| 601 | ide_startstop_t startstop; |
| 602 | u8 ireason; |
| 603 | |
| 604 | if (ide_wait_stat(&startstop, drive, ATA_DRQ, ATA_BUSY, WAIT_READY)) { |
| 605 | printk(KERN_ERR PFX "%s: Strange, packet command initiated yet " |
| 606 | "DRQ isn't asserted\n", drive->name); |
| 607 | return startstop; |
| 608 | } |
| 609 | |
| 610 | if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) { |
| 611 | if (drive->dma) |
| 612 | drive->waiting_for_dma = 1; |
| 613 | } |
| 614 | |
| 615 | if (dev_is_idecd(drive)) { |
| 616 | /* ATAPI commands get padded out to 12 bytes minimum */ |
| 617 | cmd_len = COMMAND_SIZE(scsi_req(rq)->cmd[0]); |
| 618 | if (cmd_len < ATAPI_MIN_CDB_BYTES) |
| 619 | cmd_len = ATAPI_MIN_CDB_BYTES; |
| 620 | |
| 621 | timeout = rq->timeout; |
| 622 | expiry = ide_cd_expiry; |
| 623 | } else { |
| 624 | pc = drive->pc; |
| 625 | |
| 626 | cmd_len = ATAPI_MIN_CDB_BYTES; |
| 627 | |
| 628 | /* |
| 629 | * If necessary schedule the packet transfer to occur 'timeout' |
| 630 | * milliseconds later in ide_delayed_transfer_pc() after the |
| 631 | * device says it's ready for a packet. |
| 632 | */ |
| 633 | if (drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) { |
| 634 | timeout = drive->pc_delay; |
| 635 | expiry = &ide_delayed_transfer_pc; |
| 636 | } else { |
| 637 | timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD |
| 638 | : WAIT_TAPE_CMD; |
| 639 | expiry = NULL; |
| 640 | } |
| 641 | |
| 642 | ireason = ide_read_ireason(drive); |
| 643 | if (drive->media == ide_tape) |
| 644 | ireason = ide_wait_ireason(drive, ireason); |
| 645 | |
| 646 | if ((ireason & ATAPI_COD) == 0 || (ireason & ATAPI_IO)) { |
| 647 | printk(KERN_ERR PFX "%s: (IO,CoD) != (0,1) while " |
| 648 | "issuing a packet command\n", drive->name); |
| 649 | |
| 650 | return ide_do_reset(drive); |
| 651 | } |
| 652 | } |
| 653 | |
| 654 | hwif->expiry = expiry; |
| 655 | |
| 656 | /* Set the interrupt routine */ |
| 657 | ide_set_handler(drive, |
| 658 | (dev_is_idecd(drive) ? drive->irq_handler |
| 659 | : ide_pc_intr), |
| 660 | timeout); |
| 661 | |
| 662 | /* Send the actual packet */ |
| 663 | if ((drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) == 0) |
| 664 | hwif->tp_ops->output_data(drive, NULL, scsi_req(rq)->cmd, cmd_len); |
| 665 | |
| 666 | /* Begin DMA, if necessary */ |
| 667 | if (dev_is_idecd(drive)) { |
| 668 | if (drive->dma) |
| 669 | hwif->dma_ops->dma_start(drive); |
| 670 | } else { |
| 671 | if (pc->flags & PC_FLAG_DMA_OK) { |
| 672 | pc->flags |= PC_FLAG_DMA_IN_PROGRESS; |
| 673 | hwif->dma_ops->dma_start(drive); |
| 674 | } |
| 675 | } |
| 676 | |
| 677 | return ide_started; |
| 678 | } |
| 679 | |
| 680 | ide_startstop_t ide_issue_pc(ide_drive_t *drive, struct ide_cmd *cmd) |
| 681 | { |
| 682 | struct ide_atapi_pc *pc; |
| 683 | ide_hwif_t *hwif = drive->hwif; |
| 684 | ide_expiry_t *expiry = NULL; |
| 685 | struct request *rq = hwif->rq; |
| 686 | unsigned int timeout, bytes; |
| 687 | u16 bcount; |
| 688 | u8 valid_tf; |
| 689 | u8 drq_int = !!(drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT); |
| 690 | |
| 691 | if (dev_is_idecd(drive)) { |
| 692 | valid_tf = IDE_VALID_NSECT | IDE_VALID_LBAL; |
| 693 | bcount = ide_cd_get_xferlen(rq); |
| 694 | expiry = ide_cd_expiry; |
| 695 | timeout = ATAPI_WAIT_PC; |
| 696 | |
| 697 | if (drive->dma) |
| 698 | drive->dma = !ide_dma_prepare(drive, cmd); |
| 699 | } else { |
| 700 | pc = drive->pc; |
| 701 | |
| 702 | valid_tf = IDE_VALID_DEVICE; |
| 703 | bytes = blk_rq_bytes(rq); |
| 704 | bcount = ((drive->media == ide_tape) ? bytes |
| 705 | : min_t(unsigned int, |
| 706 | bytes, 63 * 1024)); |
| 707 | |
| 708 | /* We haven't transferred any data yet */ |
| 709 | scsi_req(rq)->resid_len = bcount; |
| 710 | |
| 711 | if (pc->flags & PC_FLAG_DMA_ERROR) { |
| 712 | pc->flags &= ~PC_FLAG_DMA_ERROR; |
| 713 | ide_dma_off(drive); |
| 714 | } |
| 715 | |
| 716 | if (pc->flags & PC_FLAG_DMA_OK) |
| 717 | drive->dma = !ide_dma_prepare(drive, cmd); |
| 718 | |
| 719 | if (!drive->dma) |
| 720 | pc->flags &= ~PC_FLAG_DMA_OK; |
| 721 | |
| 722 | timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD |
| 723 | : WAIT_TAPE_CMD; |
| 724 | } |
| 725 | |
| 726 | ide_init_packet_cmd(cmd, valid_tf, bcount, drive->dma); |
| 727 | |
| 728 | (void)do_rw_taskfile(drive, cmd); |
| 729 | |
| 730 | if (drq_int) { |
| 731 | if (drive->dma) |
| 732 | drive->waiting_for_dma = 0; |
| 733 | hwif->expiry = expiry; |
| 734 | } |
| 735 | |
| 736 | ide_execute_command(drive, cmd, ide_transfer_pc, timeout); |
| 737 | |
| 738 | return drq_int ? ide_started : ide_transfer_pc(drive); |
| 739 | } |
| 740 | EXPORT_SYMBOL_GPL(ide_issue_pc); |