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