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