1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* GD ROM driver for the SEGA Dreamcast 3 * copyright Adrian McMenamin, 2007 4 * With thanks to Marcus Comstedt and Nathan Keynes 5 * for work in reversing PIO and DMA 6 */ 7 8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 9 10 #include <linux/init.h> 11 #include <linux/module.h> 12 #include <linux/fs.h> 13 #include <linux/kernel.h> 14 #include <linux/list.h> 15 #include <linux/slab.h> 16 #include <linux/dma-mapping.h> 17 #include <linux/cdrom.h> 18 #include <linux/bio.h> 19 #include <linux/blk-mq.h> 20 #include <linux/interrupt.h> 21 #include <linux/device.h> 22 #include <linux/mutex.h> 23 #include <linux/wait.h> 24 #include <linux/platform_device.h> 25 #include <scsi/scsi.h> 26 #include <asm/io.h> 27 #include <asm/dma.h> 28 #include <asm/delay.h> 29 #include <mach/dma.h> 30 #include <mach/sysasic.h> 31 32 #define GDROM_DEV_NAME "gdrom" 33 #define GD_SESSION_OFFSET 150 34 35 /* GD Rom commands */ 36 #define GDROM_COM_SOFTRESET 0x08 37 #define GDROM_COM_EXECDIAG 0x90 38 #define GDROM_COM_PACKET 0xA0 39 #define GDROM_COM_IDDEV 0xA1 40 41 /* GD Rom registers */ 42 #define GDROM_BASE_REG 0xA05F7000 43 #define GDROM_ALTSTATUS_REG (GDROM_BASE_REG + 0x18) 44 #define GDROM_DATA_REG (GDROM_BASE_REG + 0x80) 45 #define GDROM_ERROR_REG (GDROM_BASE_REG + 0x84) 46 #define GDROM_INTSEC_REG (GDROM_BASE_REG + 0x88) 47 #define GDROM_SECNUM_REG (GDROM_BASE_REG + 0x8C) 48 #define GDROM_BCL_REG (GDROM_BASE_REG + 0x90) 49 #define GDROM_BCH_REG (GDROM_BASE_REG + 0x94) 50 #define GDROM_DSEL_REG (GDROM_BASE_REG + 0x98) 51 #define GDROM_STATUSCOMMAND_REG (GDROM_BASE_REG + 0x9C) 52 #define GDROM_RESET_REG (GDROM_BASE_REG + 0x4E4) 53 54 #define GDROM_DMA_STARTADDR_REG (GDROM_BASE_REG + 0x404) 55 #define GDROM_DMA_LENGTH_REG (GDROM_BASE_REG + 0x408) 56 #define GDROM_DMA_DIRECTION_REG (GDROM_BASE_REG + 0x40C) 57 #define GDROM_DMA_ENABLE_REG (GDROM_BASE_REG + 0x414) 58 #define GDROM_DMA_STATUS_REG (GDROM_BASE_REG + 0x418) 59 #define GDROM_DMA_WAIT_REG (GDROM_BASE_REG + 0x4A0) 60 #define GDROM_DMA_ACCESS_CTRL_REG (GDROM_BASE_REG + 0x4B8) 61 62 #define GDROM_HARD_SECTOR 2048 63 #define BLOCK_LAYER_SECTOR 512 64 #define GD_TO_BLK 4 65 66 #define GDROM_DEFAULT_TIMEOUT (HZ * 7) 67 68 static DEFINE_MUTEX(gdrom_mutex); 69 static const struct { 70 int sense_key; 71 const char * const text; 72 } sense_texts[] = { 73 {NO_SENSE, "OK"}, 74 {RECOVERED_ERROR, "Recovered from error"}, 75 {NOT_READY, "Device not ready"}, 76 {MEDIUM_ERROR, "Disk not ready"}, 77 {HARDWARE_ERROR, "Hardware error"}, 78 {ILLEGAL_REQUEST, "Command has failed"}, 79 {UNIT_ATTENTION, "Device needs attention - disk may have been changed"}, 80 {DATA_PROTECT, "Data protection error"}, 81 {ABORTED_COMMAND, "Command aborted"}, 82 }; 83 84 static struct platform_device *pd; 85 static int gdrom_major; 86 static DECLARE_WAIT_QUEUE_HEAD(command_queue); 87 static DECLARE_WAIT_QUEUE_HEAD(request_queue); 88 89 struct gdromtoc { 90 unsigned int entry[99]; 91 unsigned int first, last; 92 unsigned int leadout; 93 }; 94 95 static struct gdrom_unit { 96 struct gendisk *disk; 97 struct cdrom_device_info *cd_info; 98 int status; 99 int pending; 100 int transfer; 101 char disk_type; 102 struct gdromtoc *toc; 103 struct request_queue *gdrom_rq; 104 struct blk_mq_tag_set tag_set; 105 } gd; 106 107 struct gdrom_id { 108 char mid; 109 char modid; 110 char verid; 111 char padA[13]; 112 char mname[16]; 113 char modname[16]; 114 char firmver[16]; 115 char padB[16]; 116 }; 117 118 static int gdrom_getsense(short *bufstring); 119 static int gdrom_packetcommand(struct cdrom_device_info *cd_info, 120 struct packet_command *command); 121 static int gdrom_hardreset(struct cdrom_device_info *cd_info); 122 123 static bool gdrom_is_busy(void) 124 { 125 return (__raw_readb(GDROM_ALTSTATUS_REG) & 0x80) != 0; 126 } 127 128 static bool gdrom_data_request(void) 129 { 130 return (__raw_readb(GDROM_ALTSTATUS_REG) & 0x88) == 8; 131 } 132 133 static bool gdrom_wait_clrbusy(void) 134 { 135 unsigned long timeout = jiffies + GDROM_DEFAULT_TIMEOUT; 136 while ((__raw_readb(GDROM_ALTSTATUS_REG) & 0x80) && 137 (time_before(jiffies, timeout))) 138 cpu_relax(); 139 return time_before(jiffies, timeout + 1); 140 } 141 142 static bool gdrom_wait_busy_sleeps(void) 143 { 144 unsigned long timeout; 145 /* Wait to get busy first */ 146 timeout = jiffies + GDROM_DEFAULT_TIMEOUT; 147 while (!gdrom_is_busy() && time_before(jiffies, timeout)) 148 cpu_relax(); 149 /* Now wait for busy to clear */ 150 return gdrom_wait_clrbusy(); 151 } 152 153 static void gdrom_identifydevice(void *buf) 154 { 155 int c; 156 short *data = buf; 157 /* If the device won't clear it has probably 158 * been hit by a serious failure - but we'll 159 * try to return a sense key even so */ 160 if (!gdrom_wait_clrbusy()) { 161 gdrom_getsense(NULL); 162 return; 163 } 164 __raw_writeb(GDROM_COM_IDDEV, GDROM_STATUSCOMMAND_REG); 165 if (!gdrom_wait_busy_sleeps()) { 166 gdrom_getsense(NULL); 167 return; 168 } 169 /* now read in the data */ 170 for (c = 0; c < 40; c++) 171 data[c] = __raw_readw(GDROM_DATA_REG); 172 } 173 174 static void gdrom_spicommand(void *spi_string, int buflen) 175 { 176 short *cmd = spi_string; 177 unsigned long timeout; 178 179 /* ensure IRQ_WAIT is set */ 180 __raw_writeb(0x08, GDROM_ALTSTATUS_REG); 181 /* specify how many bytes we expect back */ 182 __raw_writeb(buflen & 0xFF, GDROM_BCL_REG); 183 __raw_writeb((buflen >> 8) & 0xFF, GDROM_BCH_REG); 184 /* other parameters */ 185 __raw_writeb(0, GDROM_INTSEC_REG); 186 __raw_writeb(0, GDROM_SECNUM_REG); 187 __raw_writeb(0, GDROM_ERROR_REG); 188 /* Wait until we can go */ 189 if (!gdrom_wait_clrbusy()) { 190 gdrom_getsense(NULL); 191 return; 192 } 193 timeout = jiffies + GDROM_DEFAULT_TIMEOUT; 194 __raw_writeb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG); 195 while (!gdrom_data_request() && time_before(jiffies, timeout)) 196 cpu_relax(); 197 if (!time_before(jiffies, timeout + 1)) { 198 gdrom_getsense(NULL); 199 return; 200 } 201 outsw(GDROM_DATA_REG, cmd, 6); 202 } 203 204 205 /* gdrom_command_executediagnostic: 206 * Used to probe for presence of working GDROM 207 * Restarts GDROM device and then applies standard ATA 3 208 * Execute Diagnostic Command: a return of '1' indicates device 0 209 * present and device 1 absent 210 */ 211 static char gdrom_execute_diagnostic(void) 212 { 213 gdrom_hardreset(gd.cd_info); 214 if (!gdrom_wait_clrbusy()) 215 return 0; 216 __raw_writeb(GDROM_COM_EXECDIAG, GDROM_STATUSCOMMAND_REG); 217 if (!gdrom_wait_busy_sleeps()) 218 return 0; 219 return __raw_readb(GDROM_ERROR_REG); 220 } 221 222 /* 223 * Prepare disk command 224 * byte 0 = 0x70 225 * byte 1 = 0x1f 226 */ 227 static int gdrom_preparedisk_cmd(void) 228 { 229 struct packet_command *spin_command; 230 spin_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL); 231 if (!spin_command) 232 return -ENOMEM; 233 spin_command->cmd[0] = 0x70; 234 spin_command->cmd[2] = 0x1f; 235 spin_command->buflen = 0; 236 gd.pending = 1; 237 gdrom_packetcommand(gd.cd_info, spin_command); 238 /* 60 second timeout */ 239 wait_event_interruptible_timeout(command_queue, gd.pending == 0, 240 GDROM_DEFAULT_TIMEOUT); 241 gd.pending = 0; 242 kfree(spin_command); 243 if (gd.status & 0x01) { 244 /* log an error */ 245 gdrom_getsense(NULL); 246 return -EIO; 247 } 248 return 0; 249 } 250 251 /* 252 * Read TOC command 253 * byte 0 = 0x14 254 * byte 1 = session 255 * byte 3 = sizeof TOC >> 8 ie upper byte 256 * byte 4 = sizeof TOC & 0xff ie lower byte 257 */ 258 static int gdrom_readtoc_cmd(struct gdromtoc *toc, int session) 259 { 260 int tocsize; 261 struct packet_command *toc_command; 262 int err = 0; 263 264 toc_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL); 265 if (!toc_command) 266 return -ENOMEM; 267 tocsize = sizeof(struct gdromtoc); 268 toc_command->cmd[0] = 0x14; 269 toc_command->cmd[1] = session; 270 toc_command->cmd[3] = tocsize >> 8; 271 toc_command->cmd[4] = tocsize & 0xff; 272 toc_command->buflen = tocsize; 273 if (gd.pending) { 274 err = -EBUSY; 275 goto cleanup_readtoc_final; 276 } 277 gd.pending = 1; 278 gdrom_packetcommand(gd.cd_info, toc_command); 279 wait_event_interruptible_timeout(command_queue, gd.pending == 0, 280 GDROM_DEFAULT_TIMEOUT); 281 if (gd.pending) { 282 err = -EINVAL; 283 goto cleanup_readtoc; 284 } 285 insw(GDROM_DATA_REG, toc, tocsize/2); 286 if (gd.status & 0x01) 287 err = -EINVAL; 288 289 cleanup_readtoc: 290 gd.pending = 0; 291 cleanup_readtoc_final: 292 kfree(toc_command); 293 return err; 294 } 295 296 /* TOC helpers */ 297 static int get_entry_lba(int track) 298 { 299 return (cpu_to_be32(track & 0xffffff00) - GD_SESSION_OFFSET); 300 } 301 302 static int get_entry_q_ctrl(int track) 303 { 304 return (track & 0x000000f0) >> 4; 305 } 306 307 static int get_entry_track(int track) 308 { 309 return (track & 0x0000ff00) >> 8; 310 } 311 312 static int gdrom_get_last_session(struct cdrom_device_info *cd_info, 313 struct cdrom_multisession *ms_info) 314 { 315 int fentry, lentry, track, data, err; 316 317 if (!gd.toc) 318 return -ENOMEM; 319 320 /* Check if GD-ROM */ 321 err = gdrom_readtoc_cmd(gd.toc, 1); 322 /* Not a GD-ROM so check if standard CD-ROM */ 323 if (err) { 324 err = gdrom_readtoc_cmd(gd.toc, 0); 325 if (err) { 326 pr_info("Could not get CD table of contents\n"); 327 return -ENXIO; 328 } 329 } 330 331 fentry = get_entry_track(gd.toc->first); 332 lentry = get_entry_track(gd.toc->last); 333 /* Find the first data track */ 334 track = get_entry_track(gd.toc->last); 335 do { 336 data = gd.toc->entry[track - 1]; 337 if (get_entry_q_ctrl(data)) 338 break; /* ie a real data track */ 339 track--; 340 } while (track >= fentry); 341 342 if ((track > 100) || (track < get_entry_track(gd.toc->first))) { 343 pr_info("No data on the last session of the CD\n"); 344 gdrom_getsense(NULL); 345 return -ENXIO; 346 } 347 348 ms_info->addr_format = CDROM_LBA; 349 ms_info->addr.lba = get_entry_lba(data); 350 ms_info->xa_flag = 1; 351 return 0; 352 } 353 354 static int gdrom_open(struct cdrom_device_info *cd_info, int purpose) 355 { 356 /* spin up the disk */ 357 return gdrom_preparedisk_cmd(); 358 } 359 360 /* this function is required even if empty */ 361 static void gdrom_release(struct cdrom_device_info *cd_info) 362 { 363 } 364 365 static int gdrom_drivestatus(struct cdrom_device_info *cd_info, int ignore) 366 { 367 /* read the sense key */ 368 char sense = __raw_readb(GDROM_ERROR_REG); 369 sense &= 0xF0; 370 if (sense == 0) 371 return CDS_DISC_OK; 372 if (sense == 0x20) 373 return CDS_DRIVE_NOT_READY; 374 /* default */ 375 return CDS_NO_INFO; 376 } 377 378 static unsigned int gdrom_check_events(struct cdrom_device_info *cd_info, 379 unsigned int clearing, int ignore) 380 { 381 /* check the sense key */ 382 return (__raw_readb(GDROM_ERROR_REG) & 0xF0) == 0x60 ? 383 DISK_EVENT_MEDIA_CHANGE : 0; 384 } 385 386 /* reset the G1 bus */ 387 static int gdrom_hardreset(struct cdrom_device_info *cd_info) 388 { 389 int count; 390 __raw_writel(0x1fffff, GDROM_RESET_REG); 391 for (count = 0xa0000000; count < 0xa0200000; count += 4) 392 __raw_readl(count); 393 return 0; 394 } 395 396 /* keep the function looking like the universal 397 * CD Rom specification - returning int */ 398 static int gdrom_packetcommand(struct cdrom_device_info *cd_info, 399 struct packet_command *command) 400 { 401 gdrom_spicommand(&command->cmd, command->buflen); 402 return 0; 403 } 404 405 /* Get Sense SPI command 406 * From Marcus Comstedt 407 * cmd = 0x13 408 * cmd + 4 = length of returned buffer 409 * Returns 5 16 bit words 410 */ 411 static int gdrom_getsense(short *bufstring) 412 { 413 struct packet_command *sense_command; 414 short sense[5]; 415 int sense_key; 416 int err = -EIO; 417 418 sense_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL); 419 if (!sense_command) 420 return -ENOMEM; 421 sense_command->cmd[0] = 0x13; 422 sense_command->cmd[4] = 10; 423 sense_command->buflen = 10; 424 /* even if something is pending try to get 425 * the sense key if possible */ 426 if (gd.pending && !gdrom_wait_clrbusy()) { 427 err = -EBUSY; 428 goto cleanup_sense_final; 429 } 430 gd.pending = 1; 431 gdrom_packetcommand(gd.cd_info, sense_command); 432 wait_event_interruptible_timeout(command_queue, gd.pending == 0, 433 GDROM_DEFAULT_TIMEOUT); 434 if (gd.pending) 435 goto cleanup_sense; 436 insw(GDROM_DATA_REG, &sense, sense_command->buflen/2); 437 if (sense[1] & 40) { 438 pr_info("Drive not ready - command aborted\n"); 439 goto cleanup_sense; 440 } 441 sense_key = sense[1] & 0x0F; 442 if (sense_key < ARRAY_SIZE(sense_texts)) 443 pr_info("%s\n", sense_texts[sense_key].text); 444 else 445 pr_err("Unknown sense key: %d\n", sense_key); 446 if (bufstring) /* return addional sense data */ 447 memcpy(bufstring, &sense[4], 2); 448 if (sense_key < 2) 449 err = 0; 450 451 cleanup_sense: 452 gd.pending = 0; 453 cleanup_sense_final: 454 kfree(sense_command); 455 return err; 456 } 457 458 static int gdrom_audio_ioctl(struct cdrom_device_info *cdi, unsigned int cmd, 459 void *arg) 460 { 461 return -EINVAL; 462 } 463 464 static const struct cdrom_device_ops gdrom_ops = { 465 .open = gdrom_open, 466 .release = gdrom_release, 467 .drive_status = gdrom_drivestatus, 468 .check_events = gdrom_check_events, 469 .get_last_session = gdrom_get_last_session, 470 .reset = gdrom_hardreset, 471 .audio_ioctl = gdrom_audio_ioctl, 472 .generic_packet = cdrom_dummy_generic_packet, 473 .capability = CDC_MULTI_SESSION | CDC_MEDIA_CHANGED | 474 CDC_RESET | CDC_DRIVE_STATUS | CDC_CD_R, 475 }; 476 477 static int gdrom_bdops_open(struct gendisk *disk, blk_mode_t mode) 478 { 479 int ret; 480 481 disk_check_media_change(disk); 482 483 mutex_lock(&gdrom_mutex); 484 ret = cdrom_open(gd.cd_info, mode); 485 mutex_unlock(&gdrom_mutex); 486 return ret; 487 } 488 489 static void gdrom_bdops_release(struct gendisk *disk) 490 { 491 mutex_lock(&gdrom_mutex); 492 cdrom_release(gd.cd_info); 493 mutex_unlock(&gdrom_mutex); 494 } 495 496 static unsigned int gdrom_bdops_check_events(struct gendisk *disk, 497 unsigned int clearing) 498 { 499 return cdrom_check_events(gd.cd_info, clearing); 500 } 501 502 static int gdrom_bdops_ioctl(struct block_device *bdev, blk_mode_t mode, 503 unsigned cmd, unsigned long arg) 504 { 505 int ret; 506 507 mutex_lock(&gdrom_mutex); 508 ret = cdrom_ioctl(gd.cd_info, bdev, cmd, arg); 509 mutex_unlock(&gdrom_mutex); 510 511 return ret; 512 } 513 514 static const struct block_device_operations gdrom_bdops = { 515 .owner = THIS_MODULE, 516 .open = gdrom_bdops_open, 517 .release = gdrom_bdops_release, 518 .check_events = gdrom_bdops_check_events, 519 .ioctl = gdrom_bdops_ioctl, 520 #ifdef CONFIG_COMPAT 521 .compat_ioctl = blkdev_compat_ptr_ioctl, 522 #endif 523 }; 524 525 static irqreturn_t gdrom_command_interrupt(int irq, void *dev_id) 526 { 527 gd.status = __raw_readb(GDROM_STATUSCOMMAND_REG); 528 if (gd.pending != 1) 529 return IRQ_HANDLED; 530 gd.pending = 0; 531 wake_up_interruptible(&command_queue); 532 return IRQ_HANDLED; 533 } 534 535 static irqreturn_t gdrom_dma_interrupt(int irq, void *dev_id) 536 { 537 gd.status = __raw_readb(GDROM_STATUSCOMMAND_REG); 538 if (gd.transfer != 1) 539 return IRQ_HANDLED; 540 gd.transfer = 0; 541 wake_up_interruptible(&request_queue); 542 return IRQ_HANDLED; 543 } 544 545 static int gdrom_set_interrupt_handlers(void) 546 { 547 int err; 548 549 err = request_irq(HW_EVENT_GDROM_CMD, gdrom_command_interrupt, 550 0, "gdrom_command", &gd); 551 if (err) 552 return err; 553 err = request_irq(HW_EVENT_GDROM_DMA, gdrom_dma_interrupt, 554 0, "gdrom_dma", &gd); 555 if (err) 556 free_irq(HW_EVENT_GDROM_CMD, &gd); 557 return err; 558 } 559 560 /* Implement DMA read using SPI command 561 * 0 -> 0x30 562 * 1 -> mode 563 * 2 -> block >> 16 564 * 3 -> block >> 8 565 * 4 -> block 566 * 8 -> sectors >> 16 567 * 9 -> sectors >> 8 568 * 10 -> sectors 569 */ 570 static blk_status_t gdrom_readdisk_dma(struct request *req) 571 { 572 int block, block_cnt; 573 blk_status_t err; 574 struct packet_command *read_command; 575 unsigned long timeout; 576 577 read_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL); 578 if (!read_command) 579 return BLK_STS_RESOURCE; 580 581 read_command->cmd[0] = 0x30; 582 read_command->cmd[1] = 0x20; 583 block = blk_rq_pos(req)/GD_TO_BLK + GD_SESSION_OFFSET; 584 block_cnt = blk_rq_sectors(req)/GD_TO_BLK; 585 __raw_writel(page_to_phys(bio_page(req->bio)) + bio_offset(req->bio), 586 GDROM_DMA_STARTADDR_REG); 587 __raw_writel(block_cnt * GDROM_HARD_SECTOR, GDROM_DMA_LENGTH_REG); 588 __raw_writel(1, GDROM_DMA_DIRECTION_REG); 589 __raw_writel(1, GDROM_DMA_ENABLE_REG); 590 read_command->cmd[2] = (block >> 16) & 0xFF; 591 read_command->cmd[3] = (block >> 8) & 0xFF; 592 read_command->cmd[4] = block & 0xFF; 593 read_command->cmd[8] = (block_cnt >> 16) & 0xFF; 594 read_command->cmd[9] = (block_cnt >> 8) & 0xFF; 595 read_command->cmd[10] = block_cnt & 0xFF; 596 /* set for DMA */ 597 __raw_writeb(1, GDROM_ERROR_REG); 598 /* other registers */ 599 __raw_writeb(0, GDROM_SECNUM_REG); 600 __raw_writeb(0, GDROM_BCL_REG); 601 __raw_writeb(0, GDROM_BCH_REG); 602 __raw_writeb(0, GDROM_DSEL_REG); 603 __raw_writeb(0, GDROM_INTSEC_REG); 604 /* Wait for registers to reset after any previous activity */ 605 timeout = jiffies + HZ / 2; 606 while (gdrom_is_busy() && time_before(jiffies, timeout)) 607 cpu_relax(); 608 __raw_writeb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG); 609 timeout = jiffies + HZ / 2; 610 /* Wait for packet command to finish */ 611 while (gdrom_is_busy() && time_before(jiffies, timeout)) 612 cpu_relax(); 613 gd.pending = 1; 614 gd.transfer = 1; 615 outsw(GDROM_DATA_REG, &read_command->cmd, 6); 616 timeout = jiffies + HZ / 2; 617 /* Wait for any pending DMA to finish */ 618 while (__raw_readb(GDROM_DMA_STATUS_REG) && 619 time_before(jiffies, timeout)) 620 cpu_relax(); 621 /* start transfer */ 622 __raw_writeb(1, GDROM_DMA_STATUS_REG); 623 wait_event_interruptible_timeout(request_queue, 624 gd.transfer == 0, GDROM_DEFAULT_TIMEOUT); 625 err = gd.transfer ? BLK_STS_IOERR : BLK_STS_OK; 626 gd.transfer = 0; 627 gd.pending = 0; 628 629 blk_mq_end_request(req, err); 630 kfree(read_command); 631 return BLK_STS_OK; 632 } 633 634 static blk_status_t gdrom_queue_rq(struct blk_mq_hw_ctx *hctx, 635 const struct blk_mq_queue_data *bd) 636 { 637 blk_mq_start_request(bd->rq); 638 639 switch (req_op(bd->rq)) { 640 case REQ_OP_READ: 641 return gdrom_readdisk_dma(bd->rq); 642 case REQ_OP_WRITE: 643 pr_notice("Read only device - write request ignored\n"); 644 return BLK_STS_IOERR; 645 default: 646 printk(KERN_DEBUG "gdrom: Non-fs request ignored\n"); 647 return BLK_STS_IOERR; 648 } 649 } 650 651 /* Print string identifying GD ROM device */ 652 static int gdrom_outputversion(void) 653 { 654 struct gdrom_id *id; 655 char *model_name, *manuf_name, *firmw_ver; 656 int err = -ENOMEM; 657 658 /* query device ID */ 659 id = kzalloc(sizeof(struct gdrom_id), GFP_KERNEL); 660 if (!id) 661 return err; 662 gdrom_identifydevice(id); 663 model_name = kstrndup(id->modname, 16, GFP_KERNEL); 664 if (!model_name) 665 goto free_id; 666 manuf_name = kstrndup(id->mname, 16, GFP_KERNEL); 667 if (!manuf_name) 668 goto free_model_name; 669 firmw_ver = kstrndup(id->firmver, 16, GFP_KERNEL); 670 if (!firmw_ver) 671 goto free_manuf_name; 672 pr_info("%s from %s with firmware %s\n", 673 model_name, manuf_name, firmw_ver); 674 err = 0; 675 kfree(firmw_ver); 676 free_manuf_name: 677 kfree(manuf_name); 678 free_model_name: 679 kfree(model_name); 680 free_id: 681 kfree(id); 682 return err; 683 } 684 685 /* set the default mode for DMA transfer */ 686 static int gdrom_init_dma_mode(void) 687 { 688 __raw_writeb(0x13, GDROM_ERROR_REG); 689 __raw_writeb(0x22, GDROM_INTSEC_REG); 690 if (!gdrom_wait_clrbusy()) 691 return -EBUSY; 692 __raw_writeb(0xEF, GDROM_STATUSCOMMAND_REG); 693 if (!gdrom_wait_busy_sleeps()) 694 return -EBUSY; 695 /* Memory protection setting for GDROM DMA 696 * Bits 31 - 16 security: 0x8843 697 * Bits 15 and 7 reserved (0) 698 * Bits 14 - 8 start of transfer range in 1 MB blocks OR'ed with 0x80 699 * Bits 6 - 0 end of transfer range in 1 MB blocks OR'ed with 0x80 700 * (0x40 | 0x80) = start range at 0x0C000000 701 * (0x7F | 0x80) = end range at 0x0FFFFFFF */ 702 __raw_writel(0x8843407F, GDROM_DMA_ACCESS_CTRL_REG); 703 __raw_writel(9, GDROM_DMA_WAIT_REG); /* DMA word setting */ 704 return 0; 705 } 706 707 static void probe_gdrom_setupcd(void) 708 { 709 gd.cd_info->ops = &gdrom_ops; 710 gd.cd_info->capacity = 1; 711 strcpy(gd.cd_info->name, GDROM_DEV_NAME); 712 gd.cd_info->mask = CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK| 713 CDC_SELECT_DISC; 714 } 715 716 static void probe_gdrom_setupdisk(void) 717 { 718 gd.disk->major = gdrom_major; 719 gd.disk->first_minor = 1; 720 gd.disk->minors = 1; 721 gd.disk->flags |= GENHD_FL_NO_PART; 722 strcpy(gd.disk->disk_name, GDROM_DEV_NAME); 723 } 724 725 static int probe_gdrom_setupqueue(void) 726 { 727 blk_queue_logical_block_size(gd.gdrom_rq, GDROM_HARD_SECTOR); 728 /* using DMA so memory will need to be contiguous */ 729 blk_queue_max_segments(gd.gdrom_rq, 1); 730 /* set a large max size to get most from DMA */ 731 blk_queue_max_segment_size(gd.gdrom_rq, 0x40000); 732 gd.disk->queue = gd.gdrom_rq; 733 return gdrom_init_dma_mode(); 734 } 735 736 static const struct blk_mq_ops gdrom_mq_ops = { 737 .queue_rq = gdrom_queue_rq, 738 }; 739 740 /* 741 * register this as a block device and as compliant with the 742 * universal CD Rom driver interface 743 */ 744 static int probe_gdrom(struct platform_device *devptr) 745 { 746 int err; 747 748 /* 749 * Ensure our "one" device is initialized properly in case of previous 750 * usages of it 751 */ 752 memset(&gd, 0, sizeof(gd)); 753 754 /* Start the device */ 755 if (gdrom_execute_diagnostic() != 1) { 756 pr_warn("ATA Probe for GDROM failed\n"); 757 return -ENODEV; 758 } 759 /* Print out firmware ID */ 760 if (gdrom_outputversion()) 761 return -ENOMEM; 762 /* Register GDROM */ 763 gdrom_major = register_blkdev(0, GDROM_DEV_NAME); 764 if (gdrom_major <= 0) 765 return gdrom_major; 766 pr_info("Registered with major number %d\n", 767 gdrom_major); 768 /* Specify basic properties of drive */ 769 gd.cd_info = kzalloc(sizeof(struct cdrom_device_info), GFP_KERNEL); 770 if (!gd.cd_info) { 771 err = -ENOMEM; 772 goto probe_fail_no_mem; 773 } 774 probe_gdrom_setupcd(); 775 776 err = blk_mq_alloc_sq_tag_set(&gd.tag_set, &gdrom_mq_ops, 1, 777 BLK_MQ_F_SHOULD_MERGE | BLK_MQ_F_BLOCKING); 778 if (err) 779 goto probe_fail_free_cd_info; 780 781 gd.disk = blk_mq_alloc_disk(&gd.tag_set, NULL); 782 if (IS_ERR(gd.disk)) { 783 err = PTR_ERR(gd.disk); 784 goto probe_fail_free_tag_set; 785 } 786 gd.gdrom_rq = gd.disk->queue; 787 probe_gdrom_setupdisk(); 788 if (register_cdrom(gd.disk, gd.cd_info)) { 789 err = -ENODEV; 790 goto probe_fail_cleanup_disk; 791 } 792 gd.disk->fops = &gdrom_bdops; 793 gd.disk->events = DISK_EVENT_MEDIA_CHANGE; 794 /* latch on to the interrupt */ 795 err = gdrom_set_interrupt_handlers(); 796 if (err) 797 goto probe_fail_cleanup_disk; 798 799 err = probe_gdrom_setupqueue(); 800 if (err) 801 goto probe_fail_free_irqs; 802 803 gd.toc = kzalloc(sizeof(struct gdromtoc), GFP_KERNEL); 804 if (!gd.toc) { 805 err = -ENOMEM; 806 goto probe_fail_free_irqs; 807 } 808 err = add_disk(gd.disk); 809 if (err) 810 goto probe_fail_add_disk; 811 812 return 0; 813 814 probe_fail_add_disk: 815 kfree(gd.toc); 816 probe_fail_free_irqs: 817 free_irq(HW_EVENT_GDROM_DMA, &gd); 818 free_irq(HW_EVENT_GDROM_CMD, &gd); 819 probe_fail_cleanup_disk: 820 put_disk(gd.disk); 821 probe_fail_free_tag_set: 822 blk_mq_free_tag_set(&gd.tag_set); 823 probe_fail_free_cd_info: 824 kfree(gd.cd_info); 825 probe_fail_no_mem: 826 unregister_blkdev(gdrom_major, GDROM_DEV_NAME); 827 gdrom_major = 0; 828 pr_warn("Probe failed - error is 0x%X\n", err); 829 return err; 830 } 831 832 static int remove_gdrom(struct platform_device *devptr) 833 { 834 blk_mq_free_tag_set(&gd.tag_set); 835 free_irq(HW_EVENT_GDROM_CMD, &gd); 836 free_irq(HW_EVENT_GDROM_DMA, &gd); 837 del_gendisk(gd.disk); 838 if (gdrom_major) 839 unregister_blkdev(gdrom_major, GDROM_DEV_NAME); 840 unregister_cdrom(gd.cd_info); 841 kfree(gd.cd_info); 842 kfree(gd.toc); 843 844 return 0; 845 } 846 847 static struct platform_driver gdrom_driver = { 848 .probe = probe_gdrom, 849 .remove = remove_gdrom, 850 .driver = { 851 .name = GDROM_DEV_NAME, 852 }, 853 }; 854 855 static int __init init_gdrom(void) 856 { 857 int rc; 858 859 rc = platform_driver_register(&gdrom_driver); 860 if (rc) 861 return rc; 862 pd = platform_device_register_simple(GDROM_DEV_NAME, -1, NULL, 0); 863 if (IS_ERR(pd)) { 864 platform_driver_unregister(&gdrom_driver); 865 return PTR_ERR(pd); 866 } 867 return 0; 868 } 869 870 static void __exit exit_gdrom(void) 871 { 872 platform_device_unregister(pd); 873 platform_driver_unregister(&gdrom_driver); 874 } 875 876 module_init(init_gdrom); 877 module_exit(exit_gdrom); 878 MODULE_AUTHOR("Adrian McMenamin <adrian@mcmen.demon.co.uk>"); 879 MODULE_DESCRIPTION("SEGA Dreamcast GD-ROM Driver"); 880 MODULE_LICENSE("GPL"); 881