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