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