1 /* GD ROM driver for the SEGA Dreamcast 2 * copyright Adrian McMenamin, 2007 3 * With thanks to Marcus Comstedt and Nathan Keynes 4 * for work in reversing PIO and DMA 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU 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 22 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 23 24 #include <linux/init.h> 25 #include <linux/module.h> 26 #include <linux/fs.h> 27 #include <linux/kernel.h> 28 #include <linux/list.h> 29 #include <linux/slab.h> 30 #include <linux/dma-mapping.h> 31 #include <linux/cdrom.h> 32 #include <linux/genhd.h> 33 #include <linux/bio.h> 34 #include <linux/blkdev.h> 35 #include <linux/interrupt.h> 36 #include <linux/device.h> 37 #include <linux/mutex.h> 38 #include <linux/wait.h> 39 #include <linux/workqueue.h> 40 #include <linux/platform_device.h> 41 #include <scsi/scsi.h> 42 #include <asm/io.h> 43 #include <asm/dma.h> 44 #include <asm/delay.h> 45 #include <mach/dma.h> 46 #include <mach/sysasic.h> 47 48 #define GDROM_DEV_NAME "gdrom" 49 #define GD_SESSION_OFFSET 150 50 51 /* GD Rom commands */ 52 #define GDROM_COM_SOFTRESET 0x08 53 #define GDROM_COM_EXECDIAG 0x90 54 #define GDROM_COM_PACKET 0xA0 55 #define GDROM_COM_IDDEV 0xA1 56 57 /* GD Rom registers */ 58 #define GDROM_BASE_REG 0xA05F7000 59 #define GDROM_ALTSTATUS_REG (GDROM_BASE_REG + 0x18) 60 #define GDROM_DATA_REG (GDROM_BASE_REG + 0x80) 61 #define GDROM_ERROR_REG (GDROM_BASE_REG + 0x84) 62 #define GDROM_INTSEC_REG (GDROM_BASE_REG + 0x88) 63 #define GDROM_SECNUM_REG (GDROM_BASE_REG + 0x8C) 64 #define GDROM_BCL_REG (GDROM_BASE_REG + 0x90) 65 #define GDROM_BCH_REG (GDROM_BASE_REG + 0x94) 66 #define GDROM_DSEL_REG (GDROM_BASE_REG + 0x98) 67 #define GDROM_STATUSCOMMAND_REG (GDROM_BASE_REG + 0x9C) 68 #define GDROM_RESET_REG (GDROM_BASE_REG + 0x4E4) 69 70 #define GDROM_DMA_STARTADDR_REG (GDROM_BASE_REG + 0x404) 71 #define GDROM_DMA_LENGTH_REG (GDROM_BASE_REG + 0x408) 72 #define GDROM_DMA_DIRECTION_REG (GDROM_BASE_REG + 0x40C) 73 #define GDROM_DMA_ENABLE_REG (GDROM_BASE_REG + 0x414) 74 #define GDROM_DMA_STATUS_REG (GDROM_BASE_REG + 0x418) 75 #define GDROM_DMA_WAIT_REG (GDROM_BASE_REG + 0x4A0) 76 #define GDROM_DMA_ACCESS_CTRL_REG (GDROM_BASE_REG + 0x4B8) 77 78 #define GDROM_HARD_SECTOR 2048 79 #define BLOCK_LAYER_SECTOR 512 80 #define GD_TO_BLK 4 81 82 #define GDROM_DEFAULT_TIMEOUT (HZ * 7) 83 84 static DEFINE_MUTEX(gdrom_mutex); 85 static const struct { 86 int sense_key; 87 const char * const text; 88 } sense_texts[] = { 89 {NO_SENSE, "OK"}, 90 {RECOVERED_ERROR, "Recovered from error"}, 91 {NOT_READY, "Device not ready"}, 92 {MEDIUM_ERROR, "Disk not ready"}, 93 {HARDWARE_ERROR, "Hardware error"}, 94 {ILLEGAL_REQUEST, "Command has failed"}, 95 {UNIT_ATTENTION, "Device needs attention - disk may have been changed"}, 96 {DATA_PROTECT, "Data protection error"}, 97 {ABORTED_COMMAND, "Command aborted"}, 98 }; 99 100 static struct platform_device *pd; 101 static int gdrom_major; 102 static DECLARE_WAIT_QUEUE_HEAD(command_queue); 103 static DECLARE_WAIT_QUEUE_HEAD(request_queue); 104 105 static DEFINE_SPINLOCK(gdrom_lock); 106 static void gdrom_readdisk_dma(struct work_struct *work); 107 static DECLARE_WORK(work, gdrom_readdisk_dma); 108 static LIST_HEAD(gdrom_deferred); 109 110 struct gdromtoc { 111 unsigned int entry[99]; 112 unsigned int first, last; 113 unsigned int leadout; 114 }; 115 116 static struct gdrom_unit { 117 struct gendisk *disk; 118 struct cdrom_device_info *cd_info; 119 int status; 120 int pending; 121 int transfer; 122 char disk_type; 123 struct gdromtoc *toc; 124 struct request_queue *gdrom_rq; 125 } gd; 126 127 struct gdrom_id { 128 char mid; 129 char modid; 130 char verid; 131 char padA[13]; 132 char mname[16]; 133 char modname[16]; 134 char firmver[16]; 135 char padB[16]; 136 }; 137 138 static int gdrom_getsense(short *bufstring); 139 static int gdrom_packetcommand(struct cdrom_device_info *cd_info, 140 struct packet_command *command); 141 static int gdrom_hardreset(struct cdrom_device_info *cd_info); 142 143 static bool gdrom_is_busy(void) 144 { 145 return (__raw_readb(GDROM_ALTSTATUS_REG) & 0x80) != 0; 146 } 147 148 static bool gdrom_data_request(void) 149 { 150 return (__raw_readb(GDROM_ALTSTATUS_REG) & 0x88) == 8; 151 } 152 153 static bool gdrom_wait_clrbusy(void) 154 { 155 unsigned long timeout = jiffies + GDROM_DEFAULT_TIMEOUT; 156 while ((__raw_readb(GDROM_ALTSTATUS_REG) & 0x80) && 157 (time_before(jiffies, timeout))) 158 cpu_relax(); 159 return time_before(jiffies, timeout + 1); 160 } 161 162 static bool gdrom_wait_busy_sleeps(void) 163 { 164 unsigned long timeout; 165 /* Wait to get busy first */ 166 timeout = jiffies + GDROM_DEFAULT_TIMEOUT; 167 while (!gdrom_is_busy() && time_before(jiffies, timeout)) 168 cpu_relax(); 169 /* Now wait for busy to clear */ 170 return gdrom_wait_clrbusy(); 171 } 172 173 static void gdrom_identifydevice(void *buf) 174 { 175 int c; 176 short *data = buf; 177 /* If the device won't clear it has probably 178 * been hit by a serious failure - but we'll 179 * try to return a sense key even so */ 180 if (!gdrom_wait_clrbusy()) { 181 gdrom_getsense(NULL); 182 return; 183 } 184 __raw_writeb(GDROM_COM_IDDEV, GDROM_STATUSCOMMAND_REG); 185 if (!gdrom_wait_busy_sleeps()) { 186 gdrom_getsense(NULL); 187 return; 188 } 189 /* now read in the data */ 190 for (c = 0; c < 40; c++) 191 data[c] = __raw_readw(GDROM_DATA_REG); 192 } 193 194 static void gdrom_spicommand(void *spi_string, int buflen) 195 { 196 short *cmd = spi_string; 197 unsigned long timeout; 198 199 /* ensure IRQ_WAIT is set */ 200 __raw_writeb(0x08, GDROM_ALTSTATUS_REG); 201 /* specify how many bytes we expect back */ 202 __raw_writeb(buflen & 0xFF, GDROM_BCL_REG); 203 __raw_writeb((buflen >> 8) & 0xFF, GDROM_BCH_REG); 204 /* other parameters */ 205 __raw_writeb(0, GDROM_INTSEC_REG); 206 __raw_writeb(0, GDROM_SECNUM_REG); 207 __raw_writeb(0, GDROM_ERROR_REG); 208 /* Wait until we can go */ 209 if (!gdrom_wait_clrbusy()) { 210 gdrom_getsense(NULL); 211 return; 212 } 213 timeout = jiffies + GDROM_DEFAULT_TIMEOUT; 214 __raw_writeb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG); 215 while (!gdrom_data_request() && time_before(jiffies, timeout)) 216 cpu_relax(); 217 if (!time_before(jiffies, timeout + 1)) { 218 gdrom_getsense(NULL); 219 return; 220 } 221 outsw(GDROM_DATA_REG, cmd, 6); 222 } 223 224 225 /* gdrom_command_executediagnostic: 226 * Used to probe for presence of working GDROM 227 * Restarts GDROM device and then applies standard ATA 3 228 * Execute Diagnostic Command: a return of '1' indicates device 0 229 * present and device 1 absent 230 */ 231 static char gdrom_execute_diagnostic(void) 232 { 233 gdrom_hardreset(gd.cd_info); 234 if (!gdrom_wait_clrbusy()) 235 return 0; 236 __raw_writeb(GDROM_COM_EXECDIAG, GDROM_STATUSCOMMAND_REG); 237 if (!gdrom_wait_busy_sleeps()) 238 return 0; 239 return __raw_readb(GDROM_ERROR_REG); 240 } 241 242 /* 243 * Prepare disk command 244 * byte 0 = 0x70 245 * byte 1 = 0x1f 246 */ 247 static int gdrom_preparedisk_cmd(void) 248 { 249 struct packet_command *spin_command; 250 spin_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL); 251 if (!spin_command) 252 return -ENOMEM; 253 spin_command->cmd[0] = 0x70; 254 spin_command->cmd[2] = 0x1f; 255 spin_command->buflen = 0; 256 gd.pending = 1; 257 gdrom_packetcommand(gd.cd_info, spin_command); 258 /* 60 second timeout */ 259 wait_event_interruptible_timeout(command_queue, gd.pending == 0, 260 GDROM_DEFAULT_TIMEOUT); 261 gd.pending = 0; 262 kfree(spin_command); 263 if (gd.status & 0x01) { 264 /* log an error */ 265 gdrom_getsense(NULL); 266 return -EIO; 267 } 268 return 0; 269 } 270 271 /* 272 * Read TOC command 273 * byte 0 = 0x14 274 * byte 1 = session 275 * byte 3 = sizeof TOC >> 8 ie upper byte 276 * byte 4 = sizeof TOC & 0xff ie lower byte 277 */ 278 static int gdrom_readtoc_cmd(struct gdromtoc *toc, int session) 279 { 280 int tocsize; 281 struct packet_command *toc_command; 282 int err = 0; 283 284 toc_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL); 285 if (!toc_command) 286 return -ENOMEM; 287 tocsize = sizeof(struct gdromtoc); 288 toc_command->cmd[0] = 0x14; 289 toc_command->cmd[1] = session; 290 toc_command->cmd[3] = tocsize >> 8; 291 toc_command->cmd[4] = tocsize & 0xff; 292 toc_command->buflen = tocsize; 293 if (gd.pending) { 294 err = -EBUSY; 295 goto cleanup_readtoc_final; 296 } 297 gd.pending = 1; 298 gdrom_packetcommand(gd.cd_info, toc_command); 299 wait_event_interruptible_timeout(command_queue, gd.pending == 0, 300 GDROM_DEFAULT_TIMEOUT); 301 if (gd.pending) { 302 err = -EINVAL; 303 goto cleanup_readtoc; 304 } 305 insw(GDROM_DATA_REG, toc, tocsize/2); 306 if (gd.status & 0x01) 307 err = -EINVAL; 308 309 cleanup_readtoc: 310 gd.pending = 0; 311 cleanup_readtoc_final: 312 kfree(toc_command); 313 return err; 314 } 315 316 /* TOC helpers */ 317 static int get_entry_lba(int track) 318 { 319 return (cpu_to_be32(track & 0xffffff00) - GD_SESSION_OFFSET); 320 } 321 322 static int get_entry_q_ctrl(int track) 323 { 324 return (track & 0x000000f0) >> 4; 325 } 326 327 static int get_entry_track(int track) 328 { 329 return (track & 0x0000ff00) >> 8; 330 } 331 332 static int gdrom_get_last_session(struct cdrom_device_info *cd_info, 333 struct cdrom_multisession *ms_info) 334 { 335 int fentry, lentry, track, data, tocuse, err; 336 if (!gd.toc) 337 return -ENOMEM; 338 tocuse = 1; 339 /* Check if GD-ROM */ 340 err = gdrom_readtoc_cmd(gd.toc, 1); 341 /* Not a GD-ROM so check if standard CD-ROM */ 342 if (err) { 343 tocuse = 0; 344 err = gdrom_readtoc_cmd(gd.toc, 0); 345 if (err) { 346 pr_info("Could not get CD table of contents\n"); 347 return -ENXIO; 348 } 349 } 350 351 fentry = get_entry_track(gd.toc->first); 352 lentry = get_entry_track(gd.toc->last); 353 /* Find the first data track */ 354 track = get_entry_track(gd.toc->last); 355 do { 356 data = gd.toc->entry[track - 1]; 357 if (get_entry_q_ctrl(data)) 358 break; /* ie a real data track */ 359 track--; 360 } while (track >= fentry); 361 362 if ((track > 100) || (track < get_entry_track(gd.toc->first))) { 363 pr_info("No data on the last session of the CD\n"); 364 gdrom_getsense(NULL); 365 return -ENXIO; 366 } 367 368 ms_info->addr_format = CDROM_LBA; 369 ms_info->addr.lba = get_entry_lba(data); 370 ms_info->xa_flag = 1; 371 return 0; 372 } 373 374 static int gdrom_open(struct cdrom_device_info *cd_info, int purpose) 375 { 376 /* spin up the disk */ 377 return gdrom_preparedisk_cmd(); 378 } 379 380 /* this function is required even if empty */ 381 static void gdrom_release(struct cdrom_device_info *cd_info) 382 { 383 } 384 385 static int gdrom_drivestatus(struct cdrom_device_info *cd_info, int ignore) 386 { 387 /* read the sense key */ 388 char sense = __raw_readb(GDROM_ERROR_REG); 389 sense &= 0xF0; 390 if (sense == 0) 391 return CDS_DISC_OK; 392 if (sense == 0x20) 393 return CDS_DRIVE_NOT_READY; 394 /* default */ 395 return CDS_NO_INFO; 396 } 397 398 static int gdrom_mediachanged(struct cdrom_device_info *cd_info, int ignore) 399 { 400 /* check the sense key */ 401 return (__raw_readb(GDROM_ERROR_REG) & 0xF0) == 0x60; 402 } 403 404 /* reset the G1 bus */ 405 static int gdrom_hardreset(struct cdrom_device_info *cd_info) 406 { 407 int count; 408 __raw_writel(0x1fffff, GDROM_RESET_REG); 409 for (count = 0xa0000000; count < 0xa0200000; count += 4) 410 __raw_readl(count); 411 return 0; 412 } 413 414 /* keep the function looking like the universal 415 * CD Rom specification - returning int */ 416 static int gdrom_packetcommand(struct cdrom_device_info *cd_info, 417 struct packet_command *command) 418 { 419 gdrom_spicommand(&command->cmd, command->buflen); 420 return 0; 421 } 422 423 /* Get Sense SPI command 424 * From Marcus Comstedt 425 * cmd = 0x13 426 * cmd + 4 = length of returned buffer 427 * Returns 5 16 bit words 428 */ 429 static int gdrom_getsense(short *bufstring) 430 { 431 struct packet_command *sense_command; 432 short sense[5]; 433 int sense_key; 434 int err = -EIO; 435 436 sense_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL); 437 if (!sense_command) 438 return -ENOMEM; 439 sense_command->cmd[0] = 0x13; 440 sense_command->cmd[4] = 10; 441 sense_command->buflen = 10; 442 /* even if something is pending try to get 443 * the sense key if possible */ 444 if (gd.pending && !gdrom_wait_clrbusy()) { 445 err = -EBUSY; 446 goto cleanup_sense_final; 447 } 448 gd.pending = 1; 449 gdrom_packetcommand(gd.cd_info, sense_command); 450 wait_event_interruptible_timeout(command_queue, gd.pending == 0, 451 GDROM_DEFAULT_TIMEOUT); 452 if (gd.pending) 453 goto cleanup_sense; 454 insw(GDROM_DATA_REG, &sense, sense_command->buflen/2); 455 if (sense[1] & 40) { 456 pr_info("Drive not ready - command aborted\n"); 457 goto cleanup_sense; 458 } 459 sense_key = sense[1] & 0x0F; 460 if (sense_key < ARRAY_SIZE(sense_texts)) 461 pr_info("%s\n", sense_texts[sense_key].text); 462 else 463 pr_err("Unknown sense key: %d\n", sense_key); 464 if (bufstring) /* return addional sense data */ 465 memcpy(bufstring, &sense[4], 2); 466 if (sense_key < 2) 467 err = 0; 468 469 cleanup_sense: 470 gd.pending = 0; 471 cleanup_sense_final: 472 kfree(sense_command); 473 return err; 474 } 475 476 static int gdrom_audio_ioctl(struct cdrom_device_info *cdi, unsigned int cmd, 477 void *arg) 478 { 479 return -EINVAL; 480 } 481 482 static struct cdrom_device_ops gdrom_ops = { 483 .open = gdrom_open, 484 .release = gdrom_release, 485 .drive_status = gdrom_drivestatus, 486 .media_changed = gdrom_mediachanged, 487 .get_last_session = gdrom_get_last_session, 488 .reset = gdrom_hardreset, 489 .audio_ioctl = gdrom_audio_ioctl, 490 .capability = CDC_MULTI_SESSION | CDC_MEDIA_CHANGED | 491 CDC_RESET | CDC_DRIVE_STATUS | CDC_CD_R, 492 .n_minors = 1, 493 }; 494 495 static int gdrom_bdops_open(struct block_device *bdev, fmode_t mode) 496 { 497 int ret; 498 mutex_lock(&gdrom_mutex); 499 ret = cdrom_open(gd.cd_info, bdev, mode); 500 mutex_unlock(&gdrom_mutex); 501 return ret; 502 } 503 504 static int gdrom_bdops_release(struct gendisk *disk, fmode_t mode) 505 { 506 mutex_lock(&gdrom_mutex); 507 cdrom_release(gd.cd_info, mode); 508 mutex_unlock(&gdrom_mutex); 509 return 0; 510 } 511 512 static int gdrom_bdops_mediachanged(struct gendisk *disk) 513 { 514 return cdrom_media_changed(gd.cd_info); 515 } 516 517 static int gdrom_bdops_ioctl(struct block_device *bdev, fmode_t mode, 518 unsigned cmd, unsigned long arg) 519 { 520 int ret; 521 522 mutex_lock(&gdrom_mutex); 523 ret = cdrom_ioctl(gd.cd_info, bdev, mode, cmd, arg); 524 mutex_unlock(&gdrom_mutex); 525 526 return ret; 527 } 528 529 static const struct block_device_operations gdrom_bdops = { 530 .owner = THIS_MODULE, 531 .open = gdrom_bdops_open, 532 .release = gdrom_bdops_release, 533 .media_changed = gdrom_bdops_mediachanged, 534 .ioctl = gdrom_bdops_ioctl, 535 }; 536 537 static irqreturn_t gdrom_command_interrupt(int irq, void *dev_id) 538 { 539 gd.status = __raw_readb(GDROM_STATUSCOMMAND_REG); 540 if (gd.pending != 1) 541 return IRQ_HANDLED; 542 gd.pending = 0; 543 wake_up_interruptible(&command_queue); 544 return IRQ_HANDLED; 545 } 546 547 static irqreturn_t gdrom_dma_interrupt(int irq, void *dev_id) 548 { 549 gd.status = __raw_readb(GDROM_STATUSCOMMAND_REG); 550 if (gd.transfer != 1) 551 return IRQ_HANDLED; 552 gd.transfer = 0; 553 wake_up_interruptible(&request_queue); 554 return IRQ_HANDLED; 555 } 556 557 static int __devinit gdrom_set_interrupt_handlers(void) 558 { 559 int err; 560 561 err = request_irq(HW_EVENT_GDROM_CMD, gdrom_command_interrupt, 562 IRQF_DISABLED, "gdrom_command", &gd); 563 if (err) 564 return err; 565 err = request_irq(HW_EVENT_GDROM_DMA, gdrom_dma_interrupt, 566 IRQF_DISABLED, "gdrom_dma", &gd); 567 if (err) 568 free_irq(HW_EVENT_GDROM_CMD, &gd); 569 return err; 570 } 571 572 /* Implement DMA read using SPI command 573 * 0 -> 0x30 574 * 1 -> mode 575 * 2 -> block >> 16 576 * 3 -> block >> 8 577 * 4 -> block 578 * 8 -> sectors >> 16 579 * 9 -> sectors >> 8 580 * 10 -> sectors 581 */ 582 static void gdrom_readdisk_dma(struct work_struct *work) 583 { 584 int err, block, block_cnt; 585 struct packet_command *read_command; 586 struct list_head *elem, *next; 587 struct request *req; 588 unsigned long timeout; 589 590 if (list_empty(&gdrom_deferred)) 591 return; 592 read_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL); 593 if (!read_command) 594 return; /* get more memory later? */ 595 read_command->cmd[0] = 0x30; 596 read_command->cmd[1] = 0x20; 597 spin_lock(&gdrom_lock); 598 list_for_each_safe(elem, next, &gdrom_deferred) { 599 req = list_entry(elem, struct request, queuelist); 600 spin_unlock(&gdrom_lock); 601 block = blk_rq_pos(req)/GD_TO_BLK + GD_SESSION_OFFSET; 602 block_cnt = blk_rq_sectors(req)/GD_TO_BLK; 603 __raw_writel(virt_to_phys(req->buffer), GDROM_DMA_STARTADDR_REG); 604 __raw_writel(block_cnt * GDROM_HARD_SECTOR, GDROM_DMA_LENGTH_REG); 605 __raw_writel(1, GDROM_DMA_DIRECTION_REG); 606 __raw_writel(1, GDROM_DMA_ENABLE_REG); 607 read_command->cmd[2] = (block >> 16) & 0xFF; 608 read_command->cmd[3] = (block >> 8) & 0xFF; 609 read_command->cmd[4] = block & 0xFF; 610 read_command->cmd[8] = (block_cnt >> 16) & 0xFF; 611 read_command->cmd[9] = (block_cnt >> 8) & 0xFF; 612 read_command->cmd[10] = block_cnt & 0xFF; 613 /* set for DMA */ 614 __raw_writeb(1, GDROM_ERROR_REG); 615 /* other registers */ 616 __raw_writeb(0, GDROM_SECNUM_REG); 617 __raw_writeb(0, GDROM_BCL_REG); 618 __raw_writeb(0, GDROM_BCH_REG); 619 __raw_writeb(0, GDROM_DSEL_REG); 620 __raw_writeb(0, GDROM_INTSEC_REG); 621 /* Wait for registers to reset after any previous activity */ 622 timeout = jiffies + HZ / 2; 623 while (gdrom_is_busy() && time_before(jiffies, timeout)) 624 cpu_relax(); 625 __raw_writeb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG); 626 timeout = jiffies + HZ / 2; 627 /* Wait for packet command to finish */ 628 while (gdrom_is_busy() && time_before(jiffies, timeout)) 629 cpu_relax(); 630 gd.pending = 1; 631 gd.transfer = 1; 632 outsw(GDROM_DATA_REG, &read_command->cmd, 6); 633 timeout = jiffies + HZ / 2; 634 /* Wait for any pending DMA to finish */ 635 while (__raw_readb(GDROM_DMA_STATUS_REG) && 636 time_before(jiffies, timeout)) 637 cpu_relax(); 638 /* start transfer */ 639 __raw_writeb(1, GDROM_DMA_STATUS_REG); 640 wait_event_interruptible_timeout(request_queue, 641 gd.transfer == 0, GDROM_DEFAULT_TIMEOUT); 642 err = gd.transfer ? -EIO : 0; 643 gd.transfer = 0; 644 gd.pending = 0; 645 /* now seek to take the request spinlock 646 * before handling ending the request */ 647 spin_lock(&gdrom_lock); 648 list_del_init(&req->queuelist); 649 __blk_end_request_all(req, err); 650 } 651 spin_unlock(&gdrom_lock); 652 kfree(read_command); 653 } 654 655 static void gdrom_request(struct request_queue *rq) 656 { 657 struct request *req; 658 659 while ((req = blk_fetch_request(rq)) != NULL) { 660 if (req->cmd_type != REQ_TYPE_FS) { 661 printk(KERN_DEBUG "gdrom: Non-fs request ignored\n"); 662 __blk_end_request_all(req, -EIO); 663 continue; 664 } 665 if (rq_data_dir(req) != READ) { 666 pr_notice("Read only device - write request ignored\n"); 667 __blk_end_request_all(req, -EIO); 668 continue; 669 } 670 671 /* 672 * Add to list of deferred work and then schedule 673 * workqueue. 674 */ 675 list_add_tail(&req->queuelist, &gdrom_deferred); 676 schedule_work(&work); 677 } 678 } 679 680 /* Print string identifying GD ROM device */ 681 static int __devinit gdrom_outputversion(void) 682 { 683 struct gdrom_id *id; 684 char *model_name, *manuf_name, *firmw_ver; 685 int err = -ENOMEM; 686 687 /* query device ID */ 688 id = kzalloc(sizeof(struct gdrom_id), GFP_KERNEL); 689 if (!id) 690 return err; 691 gdrom_identifydevice(id); 692 model_name = kstrndup(id->modname, 16, GFP_KERNEL); 693 if (!model_name) 694 goto free_id; 695 manuf_name = kstrndup(id->mname, 16, GFP_KERNEL); 696 if (!manuf_name) 697 goto free_model_name; 698 firmw_ver = kstrndup(id->firmver, 16, GFP_KERNEL); 699 if (!firmw_ver) 700 goto free_manuf_name; 701 pr_info("%s from %s with firmware %s\n", 702 model_name, manuf_name, firmw_ver); 703 err = 0; 704 kfree(firmw_ver); 705 free_manuf_name: 706 kfree(manuf_name); 707 free_model_name: 708 kfree(model_name); 709 free_id: 710 kfree(id); 711 return err; 712 } 713 714 /* set the default mode for DMA transfer */ 715 static int __devinit gdrom_init_dma_mode(void) 716 { 717 __raw_writeb(0x13, GDROM_ERROR_REG); 718 __raw_writeb(0x22, GDROM_INTSEC_REG); 719 if (!gdrom_wait_clrbusy()) 720 return -EBUSY; 721 __raw_writeb(0xEF, GDROM_STATUSCOMMAND_REG); 722 if (!gdrom_wait_busy_sleeps()) 723 return -EBUSY; 724 /* Memory protection setting for GDROM DMA 725 * Bits 31 - 16 security: 0x8843 726 * Bits 15 and 7 reserved (0) 727 * Bits 14 - 8 start of transfer range in 1 MB blocks OR'ed with 0x80 728 * Bits 6 - 0 end of transfer range in 1 MB blocks OR'ed with 0x80 729 * (0x40 | 0x80) = start range at 0x0C000000 730 * (0x7F | 0x80) = end range at 0x0FFFFFFF */ 731 __raw_writel(0x8843407F, GDROM_DMA_ACCESS_CTRL_REG); 732 __raw_writel(9, GDROM_DMA_WAIT_REG); /* DMA word setting */ 733 return 0; 734 } 735 736 static void __devinit probe_gdrom_setupcd(void) 737 { 738 gd.cd_info->ops = &gdrom_ops; 739 gd.cd_info->capacity = 1; 740 strcpy(gd.cd_info->name, GDROM_DEV_NAME); 741 gd.cd_info->mask = CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK| 742 CDC_SELECT_DISC; 743 } 744 745 static void __devinit probe_gdrom_setupdisk(void) 746 { 747 gd.disk->major = gdrom_major; 748 gd.disk->first_minor = 1; 749 gd.disk->minors = 1; 750 strcpy(gd.disk->disk_name, GDROM_DEV_NAME); 751 } 752 753 static int __devinit probe_gdrom_setupqueue(void) 754 { 755 blk_queue_logical_block_size(gd.gdrom_rq, GDROM_HARD_SECTOR); 756 /* using DMA so memory will need to be contiguous */ 757 blk_queue_max_segments(gd.gdrom_rq, 1); 758 /* set a large max size to get most from DMA */ 759 blk_queue_max_segment_size(gd.gdrom_rq, 0x40000); 760 gd.disk->queue = gd.gdrom_rq; 761 return gdrom_init_dma_mode(); 762 } 763 764 /* 765 * register this as a block device and as compliant with the 766 * universal CD Rom driver interface 767 */ 768 static int __devinit probe_gdrom(struct platform_device *devptr) 769 { 770 int err; 771 /* Start the device */ 772 if (gdrom_execute_diagnostic() != 1) { 773 pr_warning("ATA Probe for GDROM failed\n"); 774 return -ENODEV; 775 } 776 /* Print out firmware ID */ 777 if (gdrom_outputversion()) 778 return -ENOMEM; 779 /* Register GDROM */ 780 gdrom_major = register_blkdev(0, GDROM_DEV_NAME); 781 if (gdrom_major <= 0) 782 return gdrom_major; 783 pr_info("Registered with major number %d\n", 784 gdrom_major); 785 /* Specify basic properties of drive */ 786 gd.cd_info = kzalloc(sizeof(struct cdrom_device_info), GFP_KERNEL); 787 if (!gd.cd_info) { 788 err = -ENOMEM; 789 goto probe_fail_no_mem; 790 } 791 probe_gdrom_setupcd(); 792 gd.disk = alloc_disk(1); 793 if (!gd.disk) { 794 err = -ENODEV; 795 goto probe_fail_no_disk; 796 } 797 probe_gdrom_setupdisk(); 798 if (register_cdrom(gd.cd_info)) { 799 err = -ENODEV; 800 goto probe_fail_cdrom_register; 801 } 802 gd.disk->fops = &gdrom_bdops; 803 /* latch on to the interrupt */ 804 err = gdrom_set_interrupt_handlers(); 805 if (err) 806 goto probe_fail_cmdirq_register; 807 gd.gdrom_rq = blk_init_queue(gdrom_request, &gdrom_lock); 808 if (!gd.gdrom_rq) 809 goto probe_fail_requestq; 810 811 err = probe_gdrom_setupqueue(); 812 if (err) 813 goto probe_fail_toc; 814 815 gd.toc = kzalloc(sizeof(struct gdromtoc), GFP_KERNEL); 816 if (!gd.toc) 817 goto probe_fail_toc; 818 add_disk(gd.disk); 819 return 0; 820 821 probe_fail_toc: 822 blk_cleanup_queue(gd.gdrom_rq); 823 probe_fail_requestq: 824 free_irq(HW_EVENT_GDROM_DMA, &gd); 825 free_irq(HW_EVENT_GDROM_CMD, &gd); 826 probe_fail_cmdirq_register: 827 probe_fail_cdrom_register: 828 del_gendisk(gd.disk); 829 probe_fail_no_disk: 830 kfree(gd.cd_info); 831 unregister_blkdev(gdrom_major, GDROM_DEV_NAME); 832 gdrom_major = 0; 833 probe_fail_no_mem: 834 pr_warning("Probe failed - error is 0x%X\n", err); 835 return err; 836 } 837 838 static int __devexit remove_gdrom(struct platform_device *devptr) 839 { 840 flush_scheduled_work(); 841 blk_cleanup_queue(gd.gdrom_rq); 842 free_irq(HW_EVENT_GDROM_CMD, &gd); 843 free_irq(HW_EVENT_GDROM_DMA, &gd); 844 del_gendisk(gd.disk); 845 if (gdrom_major) 846 unregister_blkdev(gdrom_major, GDROM_DEV_NAME); 847 unregister_cdrom(gd.cd_info); 848 849 return 0; 850 } 851 852 static struct platform_driver gdrom_driver = { 853 .probe = probe_gdrom, 854 .remove = __devexit_p(remove_gdrom), 855 .driver = { 856 .name = GDROM_DEV_NAME, 857 }, 858 }; 859 860 static int __init init_gdrom(void) 861 { 862 int rc; 863 gd.toc = NULL; 864 rc = platform_driver_register(&gdrom_driver); 865 if (rc) 866 return rc; 867 pd = platform_device_register_simple(GDROM_DEV_NAME, -1, NULL, 0); 868 if (IS_ERR(pd)) { 869 platform_driver_unregister(&gdrom_driver); 870 return PTR_ERR(pd); 871 } 872 return 0; 873 } 874 875 static void __exit exit_gdrom(void) 876 { 877 platform_device_unregister(pd); 878 platform_driver_unregister(&gdrom_driver); 879 kfree(gd.toc); 880 } 881 882 module_init(init_gdrom); 883 module_exit(exit_gdrom); 884 MODULE_AUTHOR("Adrian McMenamin <adrian@mcmen.demon.co.uk>"); 885 MODULE_DESCRIPTION("SEGA Dreamcast GD-ROM Driver"); 886 MODULE_LICENSE("GPL"); 887