gdrom.c revision 545727f32049f6e7269f73a49904e3229192988e
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#include <linux/init.h> 23#include <linux/module.h> 24#include <linux/fs.h> 25#include <linux/kernel.h> 26#include <linux/list.h> 27#include <linux/slab.h> 28#include <linux/dma-mapping.h> 29#include <linux/cdrom.h> 30#include <linux/genhd.h> 31#include <linux/bio.h> 32#include <linux/blkdev.h> 33#include <linux/interrupt.h> 34#include <linux/device.h> 35#include <linux/wait.h> 36#include <linux/workqueue.h> 37#include <linux/platform_device.h> 38#include <scsi/scsi.h> 39#include <asm/io.h> 40#include <asm/dma.h> 41#include <asm/delay.h> 42#include <mach/dma.h> 43#include <mach/sysasic.h> 44 45#define GDROM_DEV_NAME "gdrom" 46#define GD_SESSION_OFFSET 150 47 48/* GD Rom commands */ 49#define GDROM_COM_SOFTRESET 0x08 50#define GDROM_COM_EXECDIAG 0x90 51#define GDROM_COM_PACKET 0xA0 52#define GDROM_COM_IDDEV 0xA1 53 54/* GD Rom registers */ 55#define GDROM_BASE_REG 0xA05F7000 56#define GDROM_ALTSTATUS_REG (GDROM_BASE_REG + 0x18) 57#define GDROM_DATA_REG (GDROM_BASE_REG + 0x80) 58#define GDROM_ERROR_REG (GDROM_BASE_REG + 0x84) 59#define GDROM_INTSEC_REG (GDROM_BASE_REG + 0x88) 60#define GDROM_SECNUM_REG (GDROM_BASE_REG + 0x8C) 61#define GDROM_BCL_REG (GDROM_BASE_REG + 0x90) 62#define GDROM_BCH_REG (GDROM_BASE_REG + 0x94) 63#define GDROM_DSEL_REG (GDROM_BASE_REG + 0x98) 64#define GDROM_STATUSCOMMAND_REG (GDROM_BASE_REG + 0x9C) 65#define GDROM_RESET_REG (GDROM_BASE_REG + 0x4E4) 66 67#define GDROM_DMA_STARTADDR_REG (GDROM_BASE_REG + 0x404) 68#define GDROM_DMA_LENGTH_REG (GDROM_BASE_REG + 0x408) 69#define GDROM_DMA_DIRECTION_REG (GDROM_BASE_REG + 0x40C) 70#define GDROM_DMA_ENABLE_REG (GDROM_BASE_REG + 0x414) 71#define GDROM_DMA_STATUS_REG (GDROM_BASE_REG + 0x418) 72#define GDROM_DMA_WAIT_REG (GDROM_BASE_REG + 0x4A0) 73#define GDROM_DMA_ACCESS_CTRL_REG (GDROM_BASE_REG + 0x4B8) 74 75#define GDROM_HARD_SECTOR 2048 76#define BLOCK_LAYER_SECTOR 512 77#define GD_TO_BLK 4 78 79#define GDROM_DEFAULT_TIMEOUT (HZ * 7) 80 81static const struct { 82 int sense_key; 83 const char * const text; 84} sense_texts[] = { 85 {NO_SENSE, "OK"}, 86 {RECOVERED_ERROR, "Recovered from error"}, 87 {NOT_READY, "Device not ready"}, 88 {MEDIUM_ERROR, "Disk not ready"}, 89 {HARDWARE_ERROR, "Hardware error"}, 90 {ILLEGAL_REQUEST, "Command has failed"}, 91 {UNIT_ATTENTION, "Device needs attention - disk may have been changed"}, 92 {DATA_PROTECT, "Data protection error"}, 93 {ABORTED_COMMAND, "Command aborted"}, 94}; 95 96static struct platform_device *pd; 97static int gdrom_major; 98static DECLARE_WAIT_QUEUE_HEAD(command_queue); 99static DECLARE_WAIT_QUEUE_HEAD(request_queue); 100 101static DEFINE_SPINLOCK(gdrom_lock); 102static void gdrom_readdisk_dma(struct work_struct *work); 103static DECLARE_WORK(work, gdrom_readdisk_dma); 104static LIST_HEAD(gdrom_deferred); 105 106struct gdromtoc { 107 unsigned int entry[99]; 108 unsigned int first, last; 109 unsigned int leadout; 110}; 111 112static struct gdrom_unit { 113 struct gendisk *disk; 114 struct cdrom_device_info *cd_info; 115 int status; 116 int pending; 117 int transfer; 118 char disk_type; 119 struct gdromtoc *toc; 120 struct request_queue *gdrom_rq; 121} gd; 122 123struct gdrom_id { 124 char mid; 125 char modid; 126 char verid; 127 char padA[13]; 128 char mname[16]; 129 char modname[16]; 130 char firmver[16]; 131 char padB[16]; 132}; 133 134static int gdrom_getsense(short *bufstring); 135static int gdrom_packetcommand(struct cdrom_device_info *cd_info, 136 struct packet_command *command); 137static int gdrom_hardreset(struct cdrom_device_info *cd_info); 138 139static bool gdrom_is_busy(void) 140{ 141 return (ctrl_inb(GDROM_ALTSTATUS_REG) & 0x80) != 0; 142} 143 144static bool gdrom_data_request(void) 145{ 146 return (ctrl_inb(GDROM_ALTSTATUS_REG) & 0x88) == 8; 147} 148 149static bool gdrom_wait_clrbusy(void) 150{ 151 unsigned long timeout = jiffies + GDROM_DEFAULT_TIMEOUT; 152 while ((ctrl_inb(GDROM_ALTSTATUS_REG) & 0x80) && 153 (time_before(jiffies, timeout))) 154 cpu_relax(); 155 return time_before(jiffies, timeout + 1); 156} 157 158static bool gdrom_wait_busy_sleeps(void) 159{ 160 unsigned long timeout; 161 /* Wait to get busy first */ 162 timeout = jiffies + GDROM_DEFAULT_TIMEOUT; 163 while (!gdrom_is_busy() && time_before(jiffies, timeout)) 164 cpu_relax(); 165 /* Now wait for busy to clear */ 166 return gdrom_wait_clrbusy(); 167} 168 169static void gdrom_identifydevice(void *buf) 170{ 171 int c; 172 short *data = buf; 173 /* If the device won't clear it has probably 174 * been hit by a serious failure - but we'll 175 * try to return a sense key even so */ 176 if (!gdrom_wait_clrbusy()) { 177 gdrom_getsense(NULL); 178 return; 179 } 180 ctrl_outb(GDROM_COM_IDDEV, GDROM_STATUSCOMMAND_REG); 181 if (!gdrom_wait_busy_sleeps()) { 182 gdrom_getsense(NULL); 183 return; 184 } 185 /* now read in the data */ 186 for (c = 0; c < 40; c++) 187 data[c] = ctrl_inw(GDROM_DATA_REG); 188} 189 190static void gdrom_spicommand(void *spi_string, int buflen) 191{ 192 short *cmd = spi_string; 193 unsigned long timeout; 194 195 /* ensure IRQ_WAIT is set */ 196 ctrl_outb(0x08, GDROM_ALTSTATUS_REG); 197 /* specify how many bytes we expect back */ 198 ctrl_outb(buflen & 0xFF, GDROM_BCL_REG); 199 ctrl_outb((buflen >> 8) & 0xFF, GDROM_BCH_REG); 200 /* other parameters */ 201 ctrl_outb(0, GDROM_INTSEC_REG); 202 ctrl_outb(0, GDROM_SECNUM_REG); 203 ctrl_outb(0, GDROM_ERROR_REG); 204 /* Wait until we can go */ 205 if (!gdrom_wait_clrbusy()) { 206 gdrom_getsense(NULL); 207 return; 208 } 209 timeout = jiffies + GDROM_DEFAULT_TIMEOUT; 210 ctrl_outb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG); 211 while (!gdrom_data_request() && time_before(jiffies, timeout)) 212 cpu_relax(); 213 if (!time_before(jiffies, timeout + 1)) { 214 gdrom_getsense(NULL); 215 return; 216 } 217 outsw(PHYSADDR(GDROM_DATA_REG), cmd, 6); 218} 219 220 221/* gdrom_command_executediagnostic: 222 * Used to probe for presence of working GDROM 223 * Restarts GDROM device and then applies standard ATA 3 224 * Execute Diagnostic Command: a return of '1' indicates device 0 225 * present and device 1 absent 226 */ 227static char gdrom_execute_diagnostic(void) 228{ 229 gdrom_hardreset(gd.cd_info); 230 if (!gdrom_wait_clrbusy()) 231 return 0; 232 ctrl_outb(GDROM_COM_EXECDIAG, GDROM_STATUSCOMMAND_REG); 233 if (!gdrom_wait_busy_sleeps()) 234 return 0; 235 return ctrl_inb(GDROM_ERROR_REG); 236} 237 238/* 239 * Prepare disk command 240 * byte 0 = 0x70 241 * byte 1 = 0x1f 242 */ 243static int gdrom_preparedisk_cmd(void) 244{ 245 struct packet_command *spin_command; 246 spin_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL); 247 if (!spin_command) 248 return -ENOMEM; 249 spin_command->cmd[0] = 0x70; 250 spin_command->cmd[2] = 0x1f; 251 spin_command->buflen = 0; 252 gd.pending = 1; 253 gdrom_packetcommand(gd.cd_info, spin_command); 254 /* 60 second timeout */ 255 wait_event_interruptible_timeout(command_queue, gd.pending == 0, 256 GDROM_DEFAULT_TIMEOUT); 257 gd.pending = 0; 258 kfree(spin_command); 259 if (gd.status & 0x01) { 260 /* log an error */ 261 gdrom_getsense(NULL); 262 return -EIO; 263 } 264 return 0; 265} 266 267/* 268 * Read TOC command 269 * byte 0 = 0x14 270 * byte 1 = session 271 * byte 3 = sizeof TOC >> 8 ie upper byte 272 * byte 4 = sizeof TOC & 0xff ie lower byte 273 */ 274static int gdrom_readtoc_cmd(struct gdromtoc *toc, int session) 275{ 276 int tocsize; 277 struct packet_command *toc_command; 278 int err = 0; 279 280 toc_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL); 281 if (!toc_command) 282 return -ENOMEM; 283 tocsize = sizeof(struct gdromtoc); 284 toc_command->cmd[0] = 0x14; 285 toc_command->cmd[1] = session; 286 toc_command->cmd[3] = tocsize >> 8; 287 toc_command->cmd[4] = tocsize & 0xff; 288 toc_command->buflen = tocsize; 289 if (gd.pending) { 290 err = -EBUSY; 291 goto cleanup_readtoc_final; 292 } 293 gd.pending = 1; 294 gdrom_packetcommand(gd.cd_info, toc_command); 295 wait_event_interruptible_timeout(command_queue, gd.pending == 0, 296 GDROM_DEFAULT_TIMEOUT); 297 if (gd.pending) { 298 err = -EINVAL; 299 goto cleanup_readtoc; 300 } 301 insw(PHYSADDR(GDROM_DATA_REG), toc, tocsize/2); 302 if (gd.status & 0x01) 303 err = -EINVAL; 304 305cleanup_readtoc: 306 gd.pending = 0; 307cleanup_readtoc_final: 308 kfree(toc_command); 309 return err; 310} 311 312/* TOC helpers */ 313static int get_entry_lba(int track) 314{ 315 return (cpu_to_be32(track & 0xffffff00) - GD_SESSION_OFFSET); 316} 317 318static int get_entry_q_ctrl(int track) 319{ 320 return (track & 0x000000f0) >> 4; 321} 322 323static int get_entry_track(int track) 324{ 325 return (track & 0x0000ff00) >> 8; 326} 327 328static int gdrom_get_last_session(struct cdrom_device_info *cd_info, 329 struct cdrom_multisession *ms_info) 330{ 331 int fentry, lentry, track, data, tocuse, err; 332 if (!gd.toc) 333 return -ENOMEM; 334 tocuse = 1; 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 tocuse = 0; 340 err = gdrom_readtoc_cmd(gd.toc, 0); 341 if (err) { 342 printk(KERN_INFO "GDROM: Could not get CD " 343 "table of contents\n"); 344 return -ENXIO; 345 } 346 } 347 348 fentry = get_entry_track(gd.toc->first); 349 lentry = get_entry_track(gd.toc->last); 350 /* Find the first data track */ 351 track = get_entry_track(gd.toc->last); 352 do { 353 data = gd.toc->entry[track - 1]; 354 if (get_entry_q_ctrl(data)) 355 break; /* ie a real data track */ 356 track--; 357 } while (track >= fentry); 358 359 if ((track > 100) || (track < get_entry_track(gd.toc->first))) { 360 printk(KERN_INFO "GDROM: No data on the last " 361 "session of the CD\n"); 362 gdrom_getsense(NULL); 363 return -ENXIO; 364 } 365 366 ms_info->addr_format = CDROM_LBA; 367 ms_info->addr.lba = get_entry_lba(data); 368 ms_info->xa_flag = 1; 369 return 0; 370} 371 372static int gdrom_open(struct cdrom_device_info *cd_info, int purpose) 373{ 374 /* spin up the disk */ 375 return gdrom_preparedisk_cmd(); 376} 377 378/* this function is required even if empty */ 379static void gdrom_release(struct cdrom_device_info *cd_info) 380{ 381} 382 383static int gdrom_drivestatus(struct cdrom_device_info *cd_info, int ignore) 384{ 385 /* read the sense key */ 386 char sense = ctrl_inb(GDROM_ERROR_REG); 387 sense &= 0xF0; 388 if (sense == 0) 389 return CDS_DISC_OK; 390 if (sense == 0x20) 391 return CDS_DRIVE_NOT_READY; 392 /* default */ 393 return CDS_NO_INFO; 394} 395 396static int gdrom_mediachanged(struct cdrom_device_info *cd_info, int ignore) 397{ 398 /* check the sense key */ 399 return (ctrl_inb(GDROM_ERROR_REG) & 0xF0) == 0x60; 400} 401 402/* reset the G1 bus */ 403static int gdrom_hardreset(struct cdrom_device_info *cd_info) 404{ 405 int count; 406 ctrl_outl(0x1fffff, GDROM_RESET_REG); 407 for (count = 0xa0000000; count < 0xa0200000; count += 4) 408 ctrl_inl(count); 409 return 0; 410} 411 412/* keep the function looking like the universal 413 * CD Rom specification - returning int */ 414static int gdrom_packetcommand(struct cdrom_device_info *cd_info, 415 struct packet_command *command) 416{ 417 gdrom_spicommand(&command->cmd, command->buflen); 418 return 0; 419} 420 421/* Get Sense SPI command 422 * From Marcus Comstedt 423 * cmd = 0x13 424 * cmd + 4 = length of returned buffer 425 * Returns 5 16 bit words 426 */ 427static int gdrom_getsense(short *bufstring) 428{ 429 struct packet_command *sense_command; 430 short sense[5]; 431 int sense_key; 432 int err = -EIO; 433 434 sense_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL); 435 if (!sense_command) 436 return -ENOMEM; 437 sense_command->cmd[0] = 0x13; 438 sense_command->cmd[4] = 10; 439 sense_command->buflen = 10; 440 /* even if something is pending try to get 441 * the sense key if possible */ 442 if (gd.pending && !gdrom_wait_clrbusy()) { 443 err = -EBUSY; 444 goto cleanup_sense_final; 445 } 446 gd.pending = 1; 447 gdrom_packetcommand(gd.cd_info, sense_command); 448 wait_event_interruptible_timeout(command_queue, gd.pending == 0, 449 GDROM_DEFAULT_TIMEOUT); 450 if (gd.pending) 451 goto cleanup_sense; 452 insw(PHYSADDR(GDROM_DATA_REG), &sense, sense_command->buflen/2); 453 if (sense[1] & 40) { 454 printk(KERN_INFO "GDROM: Drive not ready - command aborted\n"); 455 goto cleanup_sense; 456 } 457 sense_key = sense[1] & 0x0F; 458 if (sense_key < ARRAY_SIZE(sense_texts)) 459 printk(KERN_INFO "GDROM: %s\n", sense_texts[sense_key].text); 460 else 461 printk(KERN_ERR "GDROM: Unknown sense key: %d\n", sense_key); 462 if (bufstring) /* return addional sense data */ 463 memcpy(bufstring, &sense[4], 2); 464 if (sense_key < 2) 465 err = 0; 466 467cleanup_sense: 468 gd.pending = 0; 469cleanup_sense_final: 470 kfree(sense_command); 471 return err; 472} 473 474static int gdrom_audio_ioctl(struct cdrom_device_info *cdi, unsigned int cmd, 475 void *arg) 476{ 477 return -EINVAL; 478} 479 480static struct cdrom_device_ops gdrom_ops = { 481 .open = gdrom_open, 482 .release = gdrom_release, 483 .drive_status = gdrom_drivestatus, 484 .media_changed = gdrom_mediachanged, 485 .get_last_session = gdrom_get_last_session, 486 .reset = gdrom_hardreset, 487 .audio_ioctl = gdrom_audio_ioctl, 488 .capability = CDC_MULTI_SESSION | CDC_MEDIA_CHANGED | 489 CDC_RESET | CDC_DRIVE_STATUS | CDC_CD_R, 490 .n_minors = 1, 491}; 492 493static int gdrom_bdops_open(struct block_device *bdev, fmode_t mode) 494{ 495 return cdrom_open(gd.cd_info, bdev, mode); 496} 497 498static int gdrom_bdops_release(struct gendisk *disk, fmode_t mode) 499{ 500 cdrom_release(gd.cd_info, mode); 501 return 0; 502} 503 504static int gdrom_bdops_mediachanged(struct gendisk *disk) 505{ 506 return cdrom_media_changed(gd.cd_info); 507} 508 509static int gdrom_bdops_ioctl(struct block_device *bdev, fmode_t mode, 510 unsigned cmd, unsigned long arg) 511{ 512 return cdrom_ioctl(gd.cd_info, bdev, mode, cmd, arg); 513} 514 515static struct block_device_operations gdrom_bdops = { 516 .owner = THIS_MODULE, 517 .open = gdrom_bdops_open, 518 .release = gdrom_bdops_release, 519 .media_changed = gdrom_bdops_mediachanged, 520 .locked_ioctl = gdrom_bdops_ioctl, 521}; 522 523static irqreturn_t gdrom_command_interrupt(int irq, void *dev_id) 524{ 525 gd.status = ctrl_inb(GDROM_STATUSCOMMAND_REG); 526 if (gd.pending != 1) 527 return IRQ_HANDLED; 528 gd.pending = 0; 529 wake_up_interruptible(&command_queue); 530 return IRQ_HANDLED; 531} 532 533static irqreturn_t gdrom_dma_interrupt(int irq, void *dev_id) 534{ 535 gd.status = ctrl_inb(GDROM_STATUSCOMMAND_REG); 536 if (gd.transfer != 1) 537 return IRQ_HANDLED; 538 gd.transfer = 0; 539 wake_up_interruptible(&request_queue); 540 return IRQ_HANDLED; 541} 542 543static int __devinit gdrom_set_interrupt_handlers(void) 544{ 545 int err; 546 547 err = request_irq(HW_EVENT_GDROM_CMD, gdrom_command_interrupt, 548 IRQF_DISABLED, "gdrom_command", &gd); 549 if (err) 550 return err; 551 err = request_irq(HW_EVENT_GDROM_DMA, gdrom_dma_interrupt, 552 IRQF_DISABLED, "gdrom_dma", &gd); 553 if (err) 554 free_irq(HW_EVENT_GDROM_CMD, &gd); 555 return err; 556} 557 558/* Implement DMA read using SPI command 559 * 0 -> 0x30 560 * 1 -> mode 561 * 2 -> block >> 16 562 * 3 -> block >> 8 563 * 4 -> block 564 * 8 -> sectors >> 16 565 * 9 -> sectors >> 8 566 * 10 -> sectors 567 */ 568static void gdrom_readdisk_dma(struct work_struct *work) 569{ 570 int err, block, block_cnt; 571 struct packet_command *read_command; 572 struct list_head *elem, *next; 573 struct request *req; 574 unsigned long timeout; 575 576 if (list_empty(&gdrom_deferred)) 577 return; 578 read_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL); 579 if (!read_command) 580 return; /* get more memory later? */ 581 read_command->cmd[0] = 0x30; 582 read_command->cmd[1] = 0x20; 583 spin_lock(&gdrom_lock); 584 list_for_each_safe(elem, next, &gdrom_deferred) { 585 req = list_entry(elem, struct request, queuelist); 586 spin_unlock(&gdrom_lock); 587 block = req->sector/GD_TO_BLK + GD_SESSION_OFFSET; 588 block_cnt = req->nr_sectors/GD_TO_BLK; 589 ctrl_outl(PHYSADDR(req->buffer), GDROM_DMA_STARTADDR_REG); 590 ctrl_outl(block_cnt * GDROM_HARD_SECTOR, GDROM_DMA_LENGTH_REG); 591 ctrl_outl(1, GDROM_DMA_DIRECTION_REG); 592 ctrl_outl(1, GDROM_DMA_ENABLE_REG); 593 read_command->cmd[2] = (block >> 16) & 0xFF; 594 read_command->cmd[3] = (block >> 8) & 0xFF; 595 read_command->cmd[4] = block & 0xFF; 596 read_command->cmd[8] = (block_cnt >> 16) & 0xFF; 597 read_command->cmd[9] = (block_cnt >> 8) & 0xFF; 598 read_command->cmd[10] = block_cnt & 0xFF; 599 /* set for DMA */ 600 ctrl_outb(1, GDROM_ERROR_REG); 601 /* other registers */ 602 ctrl_outb(0, GDROM_SECNUM_REG); 603 ctrl_outb(0, GDROM_BCL_REG); 604 ctrl_outb(0, GDROM_BCH_REG); 605 ctrl_outb(0, GDROM_DSEL_REG); 606 ctrl_outb(0, GDROM_INTSEC_REG); 607 /* Wait for registers to reset after any previous activity */ 608 timeout = jiffies + HZ / 2; 609 while (gdrom_is_busy() && time_before(jiffies, timeout)) 610 cpu_relax(); 611 ctrl_outb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG); 612 timeout = jiffies + HZ / 2; 613 /* Wait for packet command to finish */ 614 while (gdrom_is_busy() && time_before(jiffies, timeout)) 615 cpu_relax(); 616 gd.pending = 1; 617 gd.transfer = 1; 618 outsw(PHYSADDR(GDROM_DATA_REG), &read_command->cmd, 6); 619 timeout = jiffies + HZ / 2; 620 /* Wait for any pending DMA to finish */ 621 while (ctrl_inb(GDROM_DMA_STATUS_REG) && 622 time_before(jiffies, timeout)) 623 cpu_relax(); 624 /* start transfer */ 625 ctrl_outb(1, GDROM_DMA_STATUS_REG); 626 wait_event_interruptible_timeout(request_queue, 627 gd.transfer == 0, GDROM_DEFAULT_TIMEOUT); 628 err = gd.transfer ? -EIO : 0; 629 gd.transfer = 0; 630 gd.pending = 0; 631 /* now seek to take the request spinlock 632 * before handling ending the request */ 633 spin_lock(&gdrom_lock); 634 list_del_init(&req->queuelist); 635 __blk_end_request(req, err, blk_rq_bytes(req)); 636 } 637 spin_unlock(&gdrom_lock); 638 kfree(read_command); 639} 640 641static void gdrom_request_handler_dma(struct request *req) 642{ 643 /* dequeue, add to list of deferred work 644 * and then schedule workqueue */ 645 blkdev_dequeue_request(req); 646 list_add_tail(&req->queuelist, &gdrom_deferred); 647 schedule_work(&work); 648} 649 650static void gdrom_request(struct request_queue *rq) 651{ 652 struct request *req; 653 654 while ((req = elv_next_request(rq)) != NULL) { 655 if (!blk_fs_request(req)) { 656 printk(KERN_DEBUG "GDROM: Non-fs request ignored\n"); 657 end_request(req, 0); 658 } 659 if (rq_data_dir(req) != READ) { 660 printk(KERN_NOTICE "GDROM: Read only device -"); 661 printk(" write request ignored\n"); 662 end_request(req, 0); 663 } 664 if (req->nr_sectors) 665 gdrom_request_handler_dma(req); 666 else 667 end_request(req, 0); 668 } 669} 670 671/* Print string identifying GD ROM device */ 672static int __devinit gdrom_outputversion(void) 673{ 674 struct gdrom_id *id; 675 char *model_name, *manuf_name, *firmw_ver; 676 int err = -ENOMEM; 677 678 /* query device ID */ 679 id = kzalloc(sizeof(struct gdrom_id), GFP_KERNEL); 680 if (!id) 681 return err; 682 gdrom_identifydevice(id); 683 model_name = kstrndup(id->modname, 16, GFP_KERNEL); 684 if (!model_name) 685 goto free_id; 686 manuf_name = kstrndup(id->mname, 16, GFP_KERNEL); 687 if (!manuf_name) 688 goto free_model_name; 689 firmw_ver = kstrndup(id->firmver, 16, GFP_KERNEL); 690 if (!firmw_ver) 691 goto free_manuf_name; 692 printk(KERN_INFO "GDROM: %s from %s with firmware %s\n", 693 model_name, manuf_name, firmw_ver); 694 err = 0; 695 kfree(firmw_ver); 696free_manuf_name: 697 kfree(manuf_name); 698free_model_name: 699 kfree(model_name); 700free_id: 701 kfree(id); 702 return err; 703} 704 705/* set the default mode for DMA transfer */ 706static int __devinit gdrom_init_dma_mode(void) 707{ 708 ctrl_outb(0x13, GDROM_ERROR_REG); 709 ctrl_outb(0x22, GDROM_INTSEC_REG); 710 if (!gdrom_wait_clrbusy()) 711 return -EBUSY; 712 ctrl_outb(0xEF, GDROM_STATUSCOMMAND_REG); 713 if (!gdrom_wait_busy_sleeps()) 714 return -EBUSY; 715 /* Memory protection setting for GDROM DMA 716 * Bits 31 - 16 security: 0x8843 717 * Bits 15 and 7 reserved (0) 718 * Bits 14 - 8 start of transfer range in 1 MB blocks OR'ed with 0x80 719 * Bits 6 - 0 end of transfer range in 1 MB blocks OR'ed with 0x80 720 * (0x40 | 0x80) = start range at 0x0C000000 721 * (0x7F | 0x80) = end range at 0x0FFFFFFF */ 722 ctrl_outl(0x8843407F, GDROM_DMA_ACCESS_CTRL_REG); 723 ctrl_outl(9, GDROM_DMA_WAIT_REG); /* DMA word setting */ 724 return 0; 725} 726 727static void __devinit probe_gdrom_setupcd(void) 728{ 729 gd.cd_info->ops = &gdrom_ops; 730 gd.cd_info->capacity = 1; 731 strcpy(gd.cd_info->name, GDROM_DEV_NAME); 732 gd.cd_info->mask = CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK| 733 CDC_SELECT_DISC; 734} 735 736static void __devinit probe_gdrom_setupdisk(void) 737{ 738 gd.disk->major = gdrom_major; 739 gd.disk->first_minor = 1; 740 gd.disk->minors = 1; 741 strcpy(gd.disk->disk_name, GDROM_DEV_NAME); 742} 743 744static int __devinit probe_gdrom_setupqueue(void) 745{ 746 blk_queue_hardsect_size(gd.gdrom_rq, GDROM_HARD_SECTOR); 747 /* using DMA so memory will need to be contiguous */ 748 blk_queue_max_hw_segments(gd.gdrom_rq, 1); 749 /* set a large max size to get most from DMA */ 750 blk_queue_max_segment_size(gd.gdrom_rq, 0x40000); 751 gd.disk->queue = gd.gdrom_rq; 752 return gdrom_init_dma_mode(); 753} 754 755/* 756 * register this as a block device and as compliant with the 757 * universal CD Rom driver interface 758 */ 759static int __devinit probe_gdrom(struct platform_device *devptr) 760{ 761 int err; 762 /* Start the device */ 763 if (gdrom_execute_diagnostic() != 1) { 764 printk(KERN_WARNING "GDROM: ATA Probe for GDROM failed.\n"); 765 return -ENODEV; 766 } 767 /* Print out firmware ID */ 768 if (gdrom_outputversion()) 769 return -ENOMEM; 770 /* Register GDROM */ 771 gdrom_major = register_blkdev(0, GDROM_DEV_NAME); 772 if (gdrom_major <= 0) 773 return gdrom_major; 774 printk(KERN_INFO "GDROM: Registered with major number %d\n", 775 gdrom_major); 776 /* Specify basic properties of drive */ 777 gd.cd_info = kzalloc(sizeof(struct cdrom_device_info), GFP_KERNEL); 778 if (!gd.cd_info) { 779 err = -ENOMEM; 780 goto probe_fail_no_mem; 781 } 782 probe_gdrom_setupcd(); 783 gd.disk = alloc_disk(1); 784 if (!gd.disk) { 785 err = -ENODEV; 786 goto probe_fail_no_disk; 787 } 788 probe_gdrom_setupdisk(); 789 if (register_cdrom(gd.cd_info)) { 790 err = -ENODEV; 791 goto probe_fail_cdrom_register; 792 } 793 gd.disk->fops = &gdrom_bdops; 794 /* latch on to the interrupt */ 795 err = gdrom_set_interrupt_handlers(); 796 if (err) 797 goto probe_fail_cmdirq_register; 798 gd.gdrom_rq = blk_init_queue(gdrom_request, &gdrom_lock); 799 if (!gd.gdrom_rq) 800 goto probe_fail_requestq; 801 802 err = probe_gdrom_setupqueue(); 803 if (err) 804 goto probe_fail_toc; 805 806 gd.toc = kzalloc(sizeof(struct gdromtoc), GFP_KERNEL); 807 if (!gd.toc) 808 goto probe_fail_toc; 809 add_disk(gd.disk); 810 return 0; 811 812probe_fail_toc: 813 blk_cleanup_queue(gd.gdrom_rq); 814probe_fail_requestq: 815 free_irq(HW_EVENT_GDROM_DMA, &gd); 816 free_irq(HW_EVENT_GDROM_CMD, &gd); 817probe_fail_cmdirq_register: 818probe_fail_cdrom_register: 819 del_gendisk(gd.disk); 820probe_fail_no_disk: 821 kfree(gd.cd_info); 822 unregister_blkdev(gdrom_major, GDROM_DEV_NAME); 823 gdrom_major = 0; 824probe_fail_no_mem: 825 printk(KERN_WARNING "GDROM: Probe failed - error is 0x%X\n", err); 826 return err; 827} 828 829static int __devexit remove_gdrom(struct platform_device *devptr) 830{ 831 flush_scheduled_work(); 832 blk_cleanup_queue(gd.gdrom_rq); 833 free_irq(HW_EVENT_GDROM_CMD, &gd); 834 free_irq(HW_EVENT_GDROM_DMA, &gd); 835 del_gendisk(gd.disk); 836 if (gdrom_major) 837 unregister_blkdev(gdrom_major, GDROM_DEV_NAME); 838 unregister_cdrom(gd.cd_info); 839 840 return 0; 841} 842 843static struct platform_driver gdrom_driver = { 844 .probe = probe_gdrom, 845 .remove = __devexit_p(remove_gdrom), 846 .driver = { 847 .name = GDROM_DEV_NAME, 848 }, 849}; 850 851static int __init init_gdrom(void) 852{ 853 int rc; 854 gd.toc = NULL; 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 866static void __exit exit_gdrom(void) 867{ 868 platform_device_unregister(pd); 869 platform_driver_unregister(&gdrom_driver); 870 kfree(gd.toc); 871} 872 873module_init(init_gdrom); 874module_exit(exit_gdrom); 875MODULE_AUTHOR("Adrian McMenamin <adrian@mcmen.demon.co.uk>"); 876MODULE_DESCRIPTION("SEGA Dreamcast GD-ROM Driver"); 877MODULE_LICENSE("GPL"); 878