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 <asm/mach/dma.h> 43 #include <asm/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 81 static 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 96 static struct platform_device *pd; 97 static int gdrom_major; 98 static DECLARE_WAIT_QUEUE_HEAD(command_queue); 99 static DECLARE_WAIT_QUEUE_HEAD(request_queue); 100 101 static DEFINE_SPINLOCK(gdrom_lock); 102 static void gdrom_readdisk_dma(struct work_struct *work); 103 static DECLARE_WORK(work, gdrom_readdisk_dma); 104 static LIST_HEAD(gdrom_deferred); 105 106 struct gdromtoc { 107 unsigned int entry[99]; 108 unsigned int first, last; 109 unsigned int leadout; 110 }; 111 112 static 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; 122 123 struct 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 }; 133 134 static int gdrom_getsense(short *bufstring); 135 static int gdrom_packetcommand(struct cdrom_device_info *cd_info, 136 struct packet_command *command); 137 static int gdrom_hardreset(struct cdrom_device_info *cd_info); 138 139 static bool gdrom_is_busy(void) 140 { 141 return (ctrl_inb(GDROM_ALTSTATUS_REG) & 0x80) != 0; 142 } 143 144 static bool gdrom_data_request(void) 145 { 146 return (ctrl_inb(GDROM_ALTSTATUS_REG) & 0x88) == 8; 147 } 148 149 static 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 } 157 158 static 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 } 168 169 static 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 } 189 190 static 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 */ 227 static 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 */ 243 static 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 */ 274 static 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; 304 305 cleanup_readtoc: 306 gd.pending = 0; 307 cleanup_readtoc_final: 308 kfree(toc_command); 309 return err; 310 } 311 312 /* TOC helpers */ 313 static int get_entry_lba(int track) 314 { 315 return (cpu_to_be32(track & 0xffffff00) - GD_SESSION_OFFSET); 316 } 317 318 static int get_entry_q_ctrl(int track) 319 { 320 return (track & 0x000000f0) >> 4; 321 } 322 323 static int get_entry_track(int track) 324 { 325 return (track & 0x0000ff00) >> 8; 326 } 327 328 static 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 } 371 372 static 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 */ 379 static void gdrom_release(struct cdrom_device_info *cd_info) 380 { 381 } 382 383 static 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 } 395 396 static 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 */ 403 static 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 */ 414 static 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 */ 427 static 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; 466 467 cleanup_sense: 468 gd.pending = 0; 469 cleanup_sense_final: 470 kfree(sense_command); 471 return err; 472 } 473 474 static struct cdrom_device_ops gdrom_ops = { 475 .open = gdrom_open, 476 .release = gdrom_release, 477 .drive_status = gdrom_drivestatus, 478 .media_changed = gdrom_mediachanged, 479 .get_last_session = gdrom_get_last_session, 480 .reset = gdrom_hardreset, 481 .capability = CDC_MULTI_SESSION | CDC_MEDIA_CHANGED | 482 CDC_RESET | CDC_DRIVE_STATUS | CDC_CD_R, 483 .n_minors = 1, 484 }; 485 486 static int gdrom_bdops_open(struct inode *inode, struct file *file) 487 { 488 return cdrom_open(gd.cd_info, inode, file); 489 } 490 491 static int gdrom_bdops_release(struct inode *inode, struct file *file) 492 { 493 return cdrom_release(gd.cd_info, file); 494 } 495 496 static int gdrom_bdops_mediachanged(struct gendisk *disk) 497 { 498 return cdrom_media_changed(gd.cd_info); 499 } 500 501 static int gdrom_bdops_ioctl(struct inode *inode, struct file *file, 502 unsigned cmd, unsigned long arg) 503 { 504 return cdrom_ioctl(file, gd.cd_info, inode, cmd, arg); 505 } 506 507 static struct block_device_operations gdrom_bdops = { 508 .owner = THIS_MODULE, 509 .open = gdrom_bdops_open, 510 .release = gdrom_bdops_release, 511 .media_changed = gdrom_bdops_mediachanged, 512 .ioctl = gdrom_bdops_ioctl, 513 }; 514 515 static irqreturn_t gdrom_command_interrupt(int irq, void *dev_id) 516 { 517 gd.status = ctrl_inb(GDROM_STATUSCOMMAND_REG); 518 if (gd.pending != 1) 519 return IRQ_HANDLED; 520 gd.pending = 0; 521 wake_up_interruptible(&command_queue); 522 return IRQ_HANDLED; 523 } 524 525 static irqreturn_t gdrom_dma_interrupt(int irq, void *dev_id) 526 { 527 gd.status = ctrl_inb(GDROM_STATUSCOMMAND_REG); 528 if (gd.transfer != 1) 529 return IRQ_HANDLED; 530 gd.transfer = 0; 531 wake_up_interruptible(&request_queue); 532 return IRQ_HANDLED; 533 } 534 535 static int __devinit gdrom_set_interrupt_handlers(void) 536 { 537 int err; 538 539 err = request_irq(HW_EVENT_GDROM_CMD, gdrom_command_interrupt, 540 IRQF_DISABLED, "gdrom_command", &gd); 541 if (err) 542 return err; 543 err = request_irq(HW_EVENT_GDROM_DMA, gdrom_dma_interrupt, 544 IRQF_DISABLED, "gdrom_dma", &gd); 545 if (err) 546 free_irq(HW_EVENT_GDROM_CMD, &gd); 547 return err; 548 } 549 550 /* Implement DMA read using SPI command 551 * 0 -> 0x30 552 * 1 -> mode 553 * 2 -> block >> 16 554 * 3 -> block >> 8 555 * 4 -> block 556 * 8 -> sectors >> 16 557 * 9 -> sectors >> 8 558 * 10 -> sectors 559 */ 560 static void gdrom_readdisk_dma(struct work_struct *work) 561 { 562 int err, block, block_cnt; 563 struct packet_command *read_command; 564 struct list_head *elem, *next; 565 struct request *req; 566 unsigned long timeout; 567 568 if (list_empty(&gdrom_deferred)) 569 return; 570 read_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL); 571 if (!read_command) 572 return; /* get more memory later? */ 573 read_command->cmd[0] = 0x30; 574 read_command->cmd[1] = 0x20; 575 spin_lock(&gdrom_lock); 576 list_for_each_safe(elem, next, &gdrom_deferred) { 577 req = list_entry(elem, struct request, queuelist); 578 spin_unlock(&gdrom_lock); 579 block = req->sector/GD_TO_BLK + GD_SESSION_OFFSET; 580 block_cnt = req->nr_sectors/GD_TO_BLK; 581 ctrl_outl(PHYSADDR(req->buffer), GDROM_DMA_STARTADDR_REG); 582 ctrl_outl(block_cnt * GDROM_HARD_SECTOR, GDROM_DMA_LENGTH_REG); 583 ctrl_outl(1, GDROM_DMA_DIRECTION_REG); 584 ctrl_outl(1, GDROM_DMA_ENABLE_REG); 585 read_command->cmd[2] = (block >> 16) & 0xFF; 586 read_command->cmd[3] = (block >> 8) & 0xFF; 587 read_command->cmd[4] = block & 0xFF; 588 read_command->cmd[8] = (block_cnt >> 16) & 0xFF; 589 read_command->cmd[9] = (block_cnt >> 8) & 0xFF; 590 read_command->cmd[10] = block_cnt & 0xFF; 591 /* set for DMA */ 592 ctrl_outb(1, GDROM_ERROR_REG); 593 /* other registers */ 594 ctrl_outb(0, GDROM_SECNUM_REG); 595 ctrl_outb(0, GDROM_BCL_REG); 596 ctrl_outb(0, GDROM_BCH_REG); 597 ctrl_outb(0, GDROM_DSEL_REG); 598 ctrl_outb(0, GDROM_INTSEC_REG); 599 /* Wait for registers to reset after any previous activity */ 600 timeout = jiffies + HZ / 2; 601 while (gdrom_is_busy() && time_before(jiffies, timeout)) 602 cpu_relax(); 603 ctrl_outb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG); 604 timeout = jiffies + HZ / 2; 605 /* Wait for packet command to finish */ 606 while (gdrom_is_busy() && time_before(jiffies, timeout)) 607 cpu_relax(); 608 gd.pending = 1; 609 gd.transfer = 1; 610 outsw(PHYSADDR(GDROM_DATA_REG), &read_command->cmd, 6); 611 timeout = jiffies + HZ / 2; 612 /* Wait for any pending DMA to finish */ 613 while (ctrl_inb(GDROM_DMA_STATUS_REG) && 614 time_before(jiffies, timeout)) 615 cpu_relax(); 616 /* start transfer */ 617 ctrl_outb(1, GDROM_DMA_STATUS_REG); 618 wait_event_interruptible_timeout(request_queue, 619 gd.transfer == 0, GDROM_DEFAULT_TIMEOUT); 620 err = gd.transfer; 621 gd.transfer = 0; 622 gd.pending = 0; 623 /* now seek to take the request spinlock 624 * before handling ending the request */ 625 spin_lock(&gdrom_lock); 626 list_del_init(&req->queuelist); 627 end_dequeued_request(req, 1 - err); 628 } 629 spin_unlock(&gdrom_lock); 630 kfree(read_command); 631 } 632 633 static void gdrom_request_handler_dma(struct request *req) 634 { 635 /* dequeue, add to list of deferred work 636 * and then schedule workqueue */ 637 blkdev_dequeue_request(req); 638 list_add_tail(&req->queuelist, &gdrom_deferred); 639 schedule_work(&work); 640 } 641 642 static void gdrom_request(struct request_queue *rq) 643 { 644 struct request *req; 645 646 while ((req = elv_next_request(rq)) != NULL) { 647 if (!blk_fs_request(req)) { 648 printk(KERN_DEBUG "GDROM: Non-fs request ignored\n"); 649 end_request(req, 0); 650 } 651 if (rq_data_dir(req) != READ) { 652 printk(KERN_NOTICE "GDROM: Read only device -"); 653 printk(" write request ignored\n"); 654 end_request(req, 0); 655 } 656 if (req->nr_sectors) 657 gdrom_request_handler_dma(req); 658 else 659 end_request(req, 0); 660 } 661 } 662 663 /* Print string identifying GD ROM device */ 664 static int __devinit gdrom_outputversion(void) 665 { 666 struct gdrom_id *id; 667 char *model_name, *manuf_name, *firmw_ver; 668 int err = -ENOMEM; 669 670 /* query device ID */ 671 id = kzalloc(sizeof(struct gdrom_id), GFP_KERNEL); 672 if (!id) 673 return err; 674 gdrom_identifydevice(id); 675 model_name = kstrndup(id->modname, 16, GFP_KERNEL); 676 if (!model_name) 677 goto free_id; 678 manuf_name = kstrndup(id->mname, 16, GFP_KERNEL); 679 if (!manuf_name) 680 goto free_model_name; 681 firmw_ver = kstrndup(id->firmver, 16, GFP_KERNEL); 682 if (!firmw_ver) 683 goto free_manuf_name; 684 printk(KERN_INFO "GDROM: %s from %s with firmware %s\n", 685 model_name, manuf_name, firmw_ver); 686 err = 0; 687 kfree(firmw_ver); 688 free_manuf_name: 689 kfree(manuf_name); 690 free_model_name: 691 kfree(model_name); 692 free_id: 693 kfree(id); 694 return err; 695 } 696 697 /* set the default mode for DMA transfer */ 698 static int __devinit gdrom_init_dma_mode(void) 699 { 700 ctrl_outb(0x13, GDROM_ERROR_REG); 701 ctrl_outb(0x22, GDROM_INTSEC_REG); 702 if (!gdrom_wait_clrbusy()) 703 return -EBUSY; 704 ctrl_outb(0xEF, GDROM_STATUSCOMMAND_REG); 705 if (!gdrom_wait_busy_sleeps()) 706 return -EBUSY; 707 /* Memory protection setting for GDROM DMA 708 * Bits 31 - 16 security: 0x8843 709 * Bits 15 and 7 reserved (0) 710 * Bits 14 - 8 start of transfer range in 1 MB blocks OR'ed with 0x80 711 * Bits 6 - 0 end of transfer range in 1 MB blocks OR'ed with 0x80 712 * (0x40 | 0x80) = start range at 0x0C000000 713 * (0x7F | 0x80) = end range at 0x0FFFFFFF */ 714 ctrl_outl(0x8843407F, GDROM_DMA_ACCESS_CTRL_REG); 715 ctrl_outl(9, GDROM_DMA_WAIT_REG); /* DMA word setting */ 716 return 0; 717 } 718 719 static void __devinit probe_gdrom_setupcd(void) 720 { 721 gd.cd_info->ops = &gdrom_ops; 722 gd.cd_info->capacity = 1; 723 strcpy(gd.cd_info->name, GDROM_DEV_NAME); 724 gd.cd_info->mask = CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK| 725 CDC_SELECT_DISC; 726 } 727 728 static void __devinit probe_gdrom_setupdisk(void) 729 { 730 gd.disk->major = gdrom_major; 731 gd.disk->first_minor = 1; 732 gd.disk->minors = 1; 733 strcpy(gd.disk->disk_name, GDROM_DEV_NAME); 734 } 735 736 static int __devinit probe_gdrom_setupqueue(void) 737 { 738 blk_queue_hardsect_size(gd.gdrom_rq, GDROM_HARD_SECTOR); 739 /* using DMA so memory will need to be contiguous */ 740 blk_queue_max_hw_segments(gd.gdrom_rq, 1); 741 /* set a large max size to get most from DMA */ 742 blk_queue_max_segment_size(gd.gdrom_rq, 0x40000); 743 gd.disk->queue = gd.gdrom_rq; 744 return gdrom_init_dma_mode(); 745 } 746 747 /* 748 * register this as a block device and as compliant with the 749 * universal CD Rom driver interface 750 */ 751 static int __devinit probe_gdrom(struct platform_device *devptr) 752 { 753 int err; 754 /* Start the device */ 755 if (gdrom_execute_diagnostic() != 1) { 756 printk(KERN_WARNING "GDROM: 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 printk(KERN_INFO "GDROM: 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 gd.disk = alloc_disk(1); 776 if (!gd.disk) { 777 err = -ENODEV; 778 goto probe_fail_no_disk; 779 } 780 probe_gdrom_setupdisk(); 781 if (register_cdrom(gd.cd_info)) { 782 err = -ENODEV; 783 goto probe_fail_cdrom_register; 784 } 785 gd.disk->fops = &gdrom_bdops; 786 /* latch on to the interrupt */ 787 err = gdrom_set_interrupt_handlers(); 788 if (err) 789 goto probe_fail_cmdirq_register; 790 gd.gdrom_rq = blk_init_queue(gdrom_request, &gdrom_lock); 791 if (!gd.gdrom_rq) 792 goto probe_fail_requestq; 793 794 err = probe_gdrom_setupqueue(); 795 if (err) 796 goto probe_fail_toc; 797 798 gd.toc = kzalloc(sizeof(struct gdromtoc), GFP_KERNEL); 799 if (!gd.toc) 800 goto probe_fail_toc; 801 add_disk(gd.disk); 802 return 0; 803 804 probe_fail_toc: 805 blk_cleanup_queue(gd.gdrom_rq); 806 probe_fail_requestq: 807 free_irq(HW_EVENT_GDROM_DMA, &gd); 808 free_irq(HW_EVENT_GDROM_CMD, &gd); 809 probe_fail_cmdirq_register: 810 probe_fail_cdrom_register: 811 del_gendisk(gd.disk); 812 probe_fail_no_disk: 813 kfree(gd.cd_info); 814 unregister_blkdev(gdrom_major, GDROM_DEV_NAME); 815 gdrom_major = 0; 816 probe_fail_no_mem: 817 printk(KERN_WARNING "GDROM: Probe failed - error is 0x%X\n", err); 818 return err; 819 } 820 821 static int __devexit remove_gdrom(struct platform_device *devptr) 822 { 823 flush_scheduled_work(); 824 blk_cleanup_queue(gd.gdrom_rq); 825 free_irq(HW_EVENT_GDROM_CMD, &gd); 826 free_irq(HW_EVENT_GDROM_DMA, &gd); 827 del_gendisk(gd.disk); 828 if (gdrom_major) 829 unregister_blkdev(gdrom_major, GDROM_DEV_NAME); 830 return unregister_cdrom(gd.cd_info); 831 } 832 833 static struct platform_driver gdrom_driver = { 834 .probe = probe_gdrom, 835 .remove = __devexit_p(remove_gdrom), 836 .driver = { 837 .name = GDROM_DEV_NAME, 838 }, 839 }; 840 841 static int __init init_gdrom(void) 842 { 843 int rc; 844 gd.toc = NULL; 845 rc = platform_driver_register(&gdrom_driver); 846 if (rc) 847 return rc; 848 pd = platform_device_register_simple(GDROM_DEV_NAME, -1, NULL, 0); 849 if (IS_ERR(pd)) { 850 platform_driver_unregister(&gdrom_driver); 851 return PTR_ERR(pd); 852 } 853 return 0; 854 } 855 856 static void __exit exit_gdrom(void) 857 { 858 platform_device_unregister(pd); 859 platform_driver_unregister(&gdrom_driver); 860 kfree(gd.toc); 861 } 862 863 module_init(init_gdrom); 864 module_exit(exit_gdrom); 865 MODULE_AUTHOR("Adrian McMenamin <adrian@mcmen.demon.co.uk>"); 866 MODULE_DESCRIPTION("SEGA Dreamcast GD-ROM Driver"); 867 MODULE_LICENSE("GPL"); 868