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 unsigned int gdrom_check_events(struct cdrom_device_info *cd_info, 399 unsigned int clearing, int ignore) 400 { 401 /* check the sense key */ 402 return (__raw_readb(GDROM_ERROR_REG) & 0xF0) == 0x60 ? 403 DISK_EVENT_MEDIA_CHANGE : 0; 404 } 405 406 /* reset the G1 bus */ 407 static int gdrom_hardreset(struct cdrom_device_info *cd_info) 408 { 409 int count; 410 __raw_writel(0x1fffff, GDROM_RESET_REG); 411 for (count = 0xa0000000; count < 0xa0200000; count += 4) 412 __raw_readl(count); 413 return 0; 414 } 415 416 /* keep the function looking like the universal 417 * CD Rom specification - returning int */ 418 static int gdrom_packetcommand(struct cdrom_device_info *cd_info, 419 struct packet_command *command) 420 { 421 gdrom_spicommand(&command->cmd, command->buflen); 422 return 0; 423 } 424 425 /* Get Sense SPI command 426 * From Marcus Comstedt 427 * cmd = 0x13 428 * cmd + 4 = length of returned buffer 429 * Returns 5 16 bit words 430 */ 431 static int gdrom_getsense(short *bufstring) 432 { 433 struct packet_command *sense_command; 434 short sense[5]; 435 int sense_key; 436 int err = -EIO; 437 438 sense_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL); 439 if (!sense_command) 440 return -ENOMEM; 441 sense_command->cmd[0] = 0x13; 442 sense_command->cmd[4] = 10; 443 sense_command->buflen = 10; 444 /* even if something is pending try to get 445 * the sense key if possible */ 446 if (gd.pending && !gdrom_wait_clrbusy()) { 447 err = -EBUSY; 448 goto cleanup_sense_final; 449 } 450 gd.pending = 1; 451 gdrom_packetcommand(gd.cd_info, sense_command); 452 wait_event_interruptible_timeout(command_queue, gd.pending == 0, 453 GDROM_DEFAULT_TIMEOUT); 454 if (gd.pending) 455 goto cleanup_sense; 456 insw(GDROM_DATA_REG, &sense, sense_command->buflen/2); 457 if (sense[1] & 40) { 458 pr_info("Drive not ready - command aborted\n"); 459 goto cleanup_sense; 460 } 461 sense_key = sense[1] & 0x0F; 462 if (sense_key < ARRAY_SIZE(sense_texts)) 463 pr_info("%s\n", sense_texts[sense_key].text); 464 else 465 pr_err("Unknown sense key: %d\n", sense_key); 466 if (bufstring) /* return addional sense data */ 467 memcpy(bufstring, &sense[4], 2); 468 if (sense_key < 2) 469 err = 0; 470 471 cleanup_sense: 472 gd.pending = 0; 473 cleanup_sense_final: 474 kfree(sense_command); 475 return err; 476 } 477 478 static int gdrom_audio_ioctl(struct cdrom_device_info *cdi, unsigned int cmd, 479 void *arg) 480 { 481 return -EINVAL; 482 } 483 484 static struct cdrom_device_ops gdrom_ops = { 485 .open = gdrom_open, 486 .release = gdrom_release, 487 .drive_status = gdrom_drivestatus, 488 .check_events = gdrom_check_events, 489 .get_last_session = gdrom_get_last_session, 490 .reset = gdrom_hardreset, 491 .audio_ioctl = gdrom_audio_ioctl, 492 .capability = CDC_MULTI_SESSION | CDC_MEDIA_CHANGED | 493 CDC_RESET | CDC_DRIVE_STATUS | CDC_CD_R, 494 .n_minors = 1, 495 }; 496 497 static int gdrom_bdops_open(struct block_device *bdev, fmode_t mode) 498 { 499 int ret; 500 mutex_lock(&gdrom_mutex); 501 ret = cdrom_open(gd.cd_info, bdev, mode); 502 mutex_unlock(&gdrom_mutex); 503 return ret; 504 } 505 506 static void gdrom_bdops_release(struct gendisk *disk, fmode_t mode) 507 { 508 mutex_lock(&gdrom_mutex); 509 cdrom_release(gd.cd_info, mode); 510 mutex_unlock(&gdrom_mutex); 511 } 512 513 static unsigned int gdrom_bdops_check_events(struct gendisk *disk, 514 unsigned int clearing) 515 { 516 return cdrom_check_events(gd.cd_info, clearing); 517 } 518 519 static int gdrom_bdops_ioctl(struct block_device *bdev, fmode_t mode, 520 unsigned cmd, unsigned long arg) 521 { 522 int ret; 523 524 mutex_lock(&gdrom_mutex); 525 ret = cdrom_ioctl(gd.cd_info, bdev, mode, cmd, arg); 526 mutex_unlock(&gdrom_mutex); 527 528 return ret; 529 } 530 531 static const struct block_device_operations gdrom_bdops = { 532 .owner = THIS_MODULE, 533 .open = gdrom_bdops_open, 534 .release = gdrom_bdops_release, 535 .check_events = gdrom_bdops_check_events, 536 .ioctl = gdrom_bdops_ioctl, 537 }; 538 539 static irqreturn_t gdrom_command_interrupt(int irq, void *dev_id) 540 { 541 gd.status = __raw_readb(GDROM_STATUSCOMMAND_REG); 542 if (gd.pending != 1) 543 return IRQ_HANDLED; 544 gd.pending = 0; 545 wake_up_interruptible(&command_queue); 546 return IRQ_HANDLED; 547 } 548 549 static irqreturn_t gdrom_dma_interrupt(int irq, void *dev_id) 550 { 551 gd.status = __raw_readb(GDROM_STATUSCOMMAND_REG); 552 if (gd.transfer != 1) 553 return IRQ_HANDLED; 554 gd.transfer = 0; 555 wake_up_interruptible(&request_queue); 556 return IRQ_HANDLED; 557 } 558 559 static int gdrom_set_interrupt_handlers(void) 560 { 561 int err; 562 563 err = request_irq(HW_EVENT_GDROM_CMD, gdrom_command_interrupt, 564 IRQF_DISABLED, "gdrom_command", &gd); 565 if (err) 566 return err; 567 err = request_irq(HW_EVENT_GDROM_DMA, gdrom_dma_interrupt, 568 IRQF_DISABLED, "gdrom_dma", &gd); 569 if (err) 570 free_irq(HW_EVENT_GDROM_CMD, &gd); 571 return err; 572 } 573 574 /* Implement DMA read using SPI command 575 * 0 -> 0x30 576 * 1 -> mode 577 * 2 -> block >> 16 578 * 3 -> block >> 8 579 * 4 -> block 580 * 8 -> sectors >> 16 581 * 9 -> sectors >> 8 582 * 10 -> sectors 583 */ 584 static void gdrom_readdisk_dma(struct work_struct *work) 585 { 586 int err, block, block_cnt; 587 struct packet_command *read_command; 588 struct list_head *elem, *next; 589 struct request *req; 590 unsigned long timeout; 591 592 if (list_empty(&gdrom_deferred)) 593 return; 594 read_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL); 595 if (!read_command) 596 return; /* get more memory later? */ 597 read_command->cmd[0] = 0x30; 598 read_command->cmd[1] = 0x20; 599 spin_lock(&gdrom_lock); 600 list_for_each_safe(elem, next, &gdrom_deferred) { 601 req = list_entry(elem, struct request, queuelist); 602 spin_unlock(&gdrom_lock); 603 block = blk_rq_pos(req)/GD_TO_BLK + GD_SESSION_OFFSET; 604 block_cnt = blk_rq_sectors(req)/GD_TO_BLK; 605 __raw_writel(virt_to_phys(req->buffer), GDROM_DMA_STARTADDR_REG); 606 __raw_writel(block_cnt * GDROM_HARD_SECTOR, GDROM_DMA_LENGTH_REG); 607 __raw_writel(1, GDROM_DMA_DIRECTION_REG); 608 __raw_writel(1, GDROM_DMA_ENABLE_REG); 609 read_command->cmd[2] = (block >> 16) & 0xFF; 610 read_command->cmd[3] = (block >> 8) & 0xFF; 611 read_command->cmd[4] = block & 0xFF; 612 read_command->cmd[8] = (block_cnt >> 16) & 0xFF; 613 read_command->cmd[9] = (block_cnt >> 8) & 0xFF; 614 read_command->cmd[10] = block_cnt & 0xFF; 615 /* set for DMA */ 616 __raw_writeb(1, GDROM_ERROR_REG); 617 /* other registers */ 618 __raw_writeb(0, GDROM_SECNUM_REG); 619 __raw_writeb(0, GDROM_BCL_REG); 620 __raw_writeb(0, GDROM_BCH_REG); 621 __raw_writeb(0, GDROM_DSEL_REG); 622 __raw_writeb(0, GDROM_INTSEC_REG); 623 /* Wait for registers to reset after any previous activity */ 624 timeout = jiffies + HZ / 2; 625 while (gdrom_is_busy() && time_before(jiffies, timeout)) 626 cpu_relax(); 627 __raw_writeb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG); 628 timeout = jiffies + HZ / 2; 629 /* Wait for packet command to finish */ 630 while (gdrom_is_busy() && time_before(jiffies, timeout)) 631 cpu_relax(); 632 gd.pending = 1; 633 gd.transfer = 1; 634 outsw(GDROM_DATA_REG, &read_command->cmd, 6); 635 timeout = jiffies + HZ / 2; 636 /* Wait for any pending DMA to finish */ 637 while (__raw_readb(GDROM_DMA_STATUS_REG) && 638 time_before(jiffies, timeout)) 639 cpu_relax(); 640 /* start transfer */ 641 __raw_writeb(1, GDROM_DMA_STATUS_REG); 642 wait_event_interruptible_timeout(request_queue, 643 gd.transfer == 0, GDROM_DEFAULT_TIMEOUT); 644 err = gd.transfer ? -EIO : 0; 645 gd.transfer = 0; 646 gd.pending = 0; 647 /* now seek to take the request spinlock 648 * before handling ending the request */ 649 spin_lock(&gdrom_lock); 650 list_del_init(&req->queuelist); 651 __blk_end_request_all(req, err); 652 } 653 spin_unlock(&gdrom_lock); 654 kfree(read_command); 655 } 656 657 static void gdrom_request(struct request_queue *rq) 658 { 659 struct request *req; 660 661 while ((req = blk_fetch_request(rq)) != NULL) { 662 if (req->cmd_type != REQ_TYPE_FS) { 663 printk(KERN_DEBUG "gdrom: Non-fs request ignored\n"); 664 __blk_end_request_all(req, -EIO); 665 continue; 666 } 667 if (rq_data_dir(req) != READ) { 668 pr_notice("Read only device - write request ignored\n"); 669 __blk_end_request_all(req, -EIO); 670 continue; 671 } 672 673 /* 674 * Add to list of deferred work and then schedule 675 * workqueue. 676 */ 677 list_add_tail(&req->queuelist, &gdrom_deferred); 678 schedule_work(&work); 679 } 680 } 681 682 /* Print string identifying GD ROM device */ 683 static int gdrom_outputversion(void) 684 { 685 struct gdrom_id *id; 686 char *model_name, *manuf_name, *firmw_ver; 687 int err = -ENOMEM; 688 689 /* query device ID */ 690 id = kzalloc(sizeof(struct gdrom_id), GFP_KERNEL); 691 if (!id) 692 return err; 693 gdrom_identifydevice(id); 694 model_name = kstrndup(id->modname, 16, GFP_KERNEL); 695 if (!model_name) 696 goto free_id; 697 manuf_name = kstrndup(id->mname, 16, GFP_KERNEL); 698 if (!manuf_name) 699 goto free_model_name; 700 firmw_ver = kstrndup(id->firmver, 16, GFP_KERNEL); 701 if (!firmw_ver) 702 goto free_manuf_name; 703 pr_info("%s from %s with firmware %s\n", 704 model_name, manuf_name, firmw_ver); 705 err = 0; 706 kfree(firmw_ver); 707 free_manuf_name: 708 kfree(manuf_name); 709 free_model_name: 710 kfree(model_name); 711 free_id: 712 kfree(id); 713 return err; 714 } 715 716 /* set the default mode for DMA transfer */ 717 static int gdrom_init_dma_mode(void) 718 { 719 __raw_writeb(0x13, GDROM_ERROR_REG); 720 __raw_writeb(0x22, GDROM_INTSEC_REG); 721 if (!gdrom_wait_clrbusy()) 722 return -EBUSY; 723 __raw_writeb(0xEF, GDROM_STATUSCOMMAND_REG); 724 if (!gdrom_wait_busy_sleeps()) 725 return -EBUSY; 726 /* Memory protection setting for GDROM DMA 727 * Bits 31 - 16 security: 0x8843 728 * Bits 15 and 7 reserved (0) 729 * Bits 14 - 8 start of transfer range in 1 MB blocks OR'ed with 0x80 730 * Bits 6 - 0 end of transfer range in 1 MB blocks OR'ed with 0x80 731 * (0x40 | 0x80) = start range at 0x0C000000 732 * (0x7F | 0x80) = end range at 0x0FFFFFFF */ 733 __raw_writel(0x8843407F, GDROM_DMA_ACCESS_CTRL_REG); 734 __raw_writel(9, GDROM_DMA_WAIT_REG); /* DMA word setting */ 735 return 0; 736 } 737 738 static void probe_gdrom_setupcd(void) 739 { 740 gd.cd_info->ops = &gdrom_ops; 741 gd.cd_info->capacity = 1; 742 strcpy(gd.cd_info->name, GDROM_DEV_NAME); 743 gd.cd_info->mask = CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK| 744 CDC_SELECT_DISC; 745 } 746 747 static void probe_gdrom_setupdisk(void) 748 { 749 gd.disk->major = gdrom_major; 750 gd.disk->first_minor = 1; 751 gd.disk->minors = 1; 752 strcpy(gd.disk->disk_name, GDROM_DEV_NAME); 753 } 754 755 static int probe_gdrom_setupqueue(void) 756 { 757 blk_queue_logical_block_size(gd.gdrom_rq, GDROM_HARD_SECTOR); 758 /* using DMA so memory will need to be contiguous */ 759 blk_queue_max_segments(gd.gdrom_rq, 1); 760 /* set a large max size to get most from DMA */ 761 blk_queue_max_segment_size(gd.gdrom_rq, 0x40000); 762 gd.disk->queue = gd.gdrom_rq; 763 return gdrom_init_dma_mode(); 764 } 765 766 /* 767 * register this as a block device and as compliant with the 768 * universal CD Rom driver interface 769 */ 770 static int probe_gdrom(struct platform_device *devptr) 771 { 772 int err; 773 /* Start the device */ 774 if (gdrom_execute_diagnostic() != 1) { 775 pr_warning("ATA Probe for GDROM failed\n"); 776 return -ENODEV; 777 } 778 /* Print out firmware ID */ 779 if (gdrom_outputversion()) 780 return -ENOMEM; 781 /* Register GDROM */ 782 gdrom_major = register_blkdev(0, GDROM_DEV_NAME); 783 if (gdrom_major <= 0) 784 return gdrom_major; 785 pr_info("Registered with major number %d\n", 786 gdrom_major); 787 /* Specify basic properties of drive */ 788 gd.cd_info = kzalloc(sizeof(struct cdrom_device_info), GFP_KERNEL); 789 if (!gd.cd_info) { 790 err = -ENOMEM; 791 goto probe_fail_no_mem; 792 } 793 probe_gdrom_setupcd(); 794 gd.disk = alloc_disk(1); 795 if (!gd.disk) { 796 err = -ENODEV; 797 goto probe_fail_no_disk; 798 } 799 probe_gdrom_setupdisk(); 800 if (register_cdrom(gd.cd_info)) { 801 err = -ENODEV; 802 goto probe_fail_cdrom_register; 803 } 804 gd.disk->fops = &gdrom_bdops; 805 /* latch on to the interrupt */ 806 err = gdrom_set_interrupt_handlers(); 807 if (err) 808 goto probe_fail_cmdirq_register; 809 gd.gdrom_rq = blk_init_queue(gdrom_request, &gdrom_lock); 810 if (!gd.gdrom_rq) 811 goto probe_fail_requestq; 812 813 err = probe_gdrom_setupqueue(); 814 if (err) 815 goto probe_fail_toc; 816 817 gd.toc = kzalloc(sizeof(struct gdromtoc), GFP_KERNEL); 818 if (!gd.toc) 819 goto probe_fail_toc; 820 add_disk(gd.disk); 821 return 0; 822 823 probe_fail_toc: 824 blk_cleanup_queue(gd.gdrom_rq); 825 probe_fail_requestq: 826 free_irq(HW_EVENT_GDROM_DMA, &gd); 827 free_irq(HW_EVENT_GDROM_CMD, &gd); 828 probe_fail_cmdirq_register: 829 probe_fail_cdrom_register: 830 del_gendisk(gd.disk); 831 probe_fail_no_disk: 832 kfree(gd.cd_info); 833 probe_fail_no_mem: 834 unregister_blkdev(gdrom_major, GDROM_DEV_NAME); 835 gdrom_major = 0; 836 pr_warning("Probe failed - error is 0x%X\n", err); 837 return err; 838 } 839 840 static int remove_gdrom(struct platform_device *devptr) 841 { 842 flush_work(&work); 843 blk_cleanup_queue(gd.gdrom_rq); 844 free_irq(HW_EVENT_GDROM_CMD, &gd); 845 free_irq(HW_EVENT_GDROM_DMA, &gd); 846 del_gendisk(gd.disk); 847 if (gdrom_major) 848 unregister_blkdev(gdrom_major, GDROM_DEV_NAME); 849 unregister_cdrom(gd.cd_info); 850 851 return 0; 852 } 853 854 static struct platform_driver gdrom_driver = { 855 .probe = probe_gdrom, 856 .remove = remove_gdrom, 857 .driver = { 858 .name = GDROM_DEV_NAME, 859 }, 860 }; 861 862 static int __init init_gdrom(void) 863 { 864 int rc; 865 gd.toc = NULL; 866 rc = platform_driver_register(&gdrom_driver); 867 if (rc) 868 return rc; 869 pd = platform_device_register_simple(GDROM_DEV_NAME, -1, NULL, 0); 870 if (IS_ERR(pd)) { 871 platform_driver_unregister(&gdrom_driver); 872 return PTR_ERR(pd); 873 } 874 return 0; 875 } 876 877 static void __exit exit_gdrom(void) 878 { 879 platform_device_unregister(pd); 880 platform_driver_unregister(&gdrom_driver); 881 kfree(gd.toc); 882 } 883 884 module_init(init_gdrom); 885 module_exit(exit_gdrom); 886 MODULE_AUTHOR("Adrian McMenamin <adrian@mcmen.demon.co.uk>"); 887 MODULE_DESCRIPTION("SEGA Dreamcast GD-ROM Driver"); 888 MODULE_LICENSE("GPL"); 889