drivers/cdrom/gdrom.c

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