linux/drivers/cdrom/gdrom.c
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   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
  69static DEFINE_MUTEX(gdrom_mutex);
  70static 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
  85static struct platform_device *pd;
  86static int gdrom_major;
  87static DECLARE_WAIT_QUEUE_HEAD(command_queue);
  88static DECLARE_WAIT_QUEUE_HEAD(request_queue);
  89
  90struct gdromtoc {
  91        unsigned int entry[99];
  92        unsigned int first, last;
  93        unsigned int leadout;
  94};
  95
  96static 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
 108struct 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
 119static int gdrom_getsense(short *bufstring);
 120static int gdrom_packetcommand(struct cdrom_device_info *cd_info,
 121        struct packet_command *command);
 122static int gdrom_hardreset(struct cdrom_device_info *cd_info);
 123
 124static bool gdrom_is_busy(void)
 125{
 126        return (__raw_readb(GDROM_ALTSTATUS_REG) & 0x80) != 0;
 127}
 128
 129static bool gdrom_data_request(void)
 130{
 131        return (__raw_readb(GDROM_ALTSTATUS_REG) & 0x88) == 8;
 132}
 133
 134static 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
 143static 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
 154static 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
 175static 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 */
 212static 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 */
 228static 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 */
 259static 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
 290cleanup_readtoc:
 291        gd.pending = 0;
 292cleanup_readtoc_final:
 293        kfree(toc_command);
 294        return err;
 295}
 296
 297/* TOC helpers */
 298static int get_entry_lba(int track)
 299{
 300        return (cpu_to_be32(track & 0xffffff00) - GD_SESSION_OFFSET);
 301}
 302
 303static int get_entry_q_ctrl(int track)
 304{
 305        return (track & 0x000000f0) >> 4;
 306}
 307
 308static int get_entry_track(int track)
 309{
 310        return (track & 0x0000ff00) >> 8;
 311}
 312
 313static 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
 355static 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 */
 362static void gdrom_release(struct cdrom_device_info *cd_info)
 363{
 364}
 365
 366static 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
 379static 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 */
 388static 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 */
 399static 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 */
 412static 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
 452cleanup_sense:
 453        gd.pending = 0;
 454cleanup_sense_final:
 455        kfree(sense_command);
 456        return err;
 457}
 458
 459static int gdrom_audio_ioctl(struct cdrom_device_info *cdi, unsigned int cmd,
 460                             void *arg)
 461{
 462        return -EINVAL;
 463}
 464
 465static 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
 478static int gdrom_bdops_open(struct block_device *bdev, fmode_t mode)
 479{
 480        int ret;
 481
 482        bdev_check_media_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
 490static 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
 497static 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
 503static 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
 515static 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        .compat_ioctl           = blkdev_compat_ptr_ioctl,
 523#endif
 524};
 525
 526static 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
 536static 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
 546static 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 */
 571static 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(page_to_phys(bio_page(req->bio)) + bio_offset(req->bio),
 587                        GDROM_DMA_STARTADDR_REG);
 588        __raw_writel(block_cnt * GDROM_HARD_SECTOR, GDROM_DMA_LENGTH_REG);
 589        __raw_writel(1, GDROM_DMA_DIRECTION_REG);
 590        __raw_writel(1, GDROM_DMA_ENABLE_REG);
 591        read_command->cmd[2] = (block >> 16) & 0xFF;
 592        read_command->cmd[3] = (block >> 8) & 0xFF;
 593        read_command->cmd[4] = block & 0xFF;
 594        read_command->cmd[8] = (block_cnt >> 16) & 0xFF;
 595        read_command->cmd[9] = (block_cnt >> 8) & 0xFF;
 596        read_command->cmd[10] = block_cnt & 0xFF;
 597        /* set for DMA */
 598        __raw_writeb(1, GDROM_ERROR_REG);
 599        /* other registers */
 600        __raw_writeb(0, GDROM_SECNUM_REG);
 601        __raw_writeb(0, GDROM_BCL_REG);
 602        __raw_writeb(0, GDROM_BCH_REG);
 603        __raw_writeb(0, GDROM_DSEL_REG);
 604        __raw_writeb(0, GDROM_INTSEC_REG);
 605        /* Wait for registers to reset after any previous activity */
 606        timeout = jiffies + HZ / 2;
 607        while (gdrom_is_busy() && time_before(jiffies, timeout))
 608                cpu_relax();
 609        __raw_writeb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG);
 610        timeout = jiffies + HZ / 2;
 611        /* Wait for packet command to finish */
 612        while (gdrom_is_busy() && time_before(jiffies, timeout))
 613                cpu_relax();
 614        gd.pending = 1;
 615        gd.transfer = 1;
 616        outsw(GDROM_DATA_REG, &read_command->cmd, 6);
 617        timeout = jiffies + HZ / 2;
 618        /* Wait for any pending DMA to finish */
 619        while (__raw_readb(GDROM_DMA_STATUS_REG) &&
 620                time_before(jiffies, timeout))
 621                cpu_relax();
 622        /* start transfer */
 623        __raw_writeb(1, GDROM_DMA_STATUS_REG);
 624        wait_event_interruptible_timeout(request_queue,
 625                gd.transfer == 0, GDROM_DEFAULT_TIMEOUT);
 626        err = gd.transfer ? BLK_STS_IOERR : BLK_STS_OK;
 627        gd.transfer = 0;
 628        gd.pending = 0;
 629
 630        blk_mq_end_request(req, err);
 631        kfree(read_command);
 632        return BLK_STS_OK;
 633}
 634
 635static blk_status_t gdrom_queue_rq(struct blk_mq_hw_ctx *hctx,
 636                                   const struct blk_mq_queue_data *bd)
 637{
 638        blk_mq_start_request(bd->rq);
 639
 640        switch (req_op(bd->rq)) {
 641        case REQ_OP_READ:
 642                return gdrom_readdisk_dma(bd->rq);
 643        case REQ_OP_WRITE:
 644                pr_notice("Read only device - write request ignored\n");
 645                return BLK_STS_IOERR;
 646        default:
 647                printk(KERN_DEBUG "gdrom: Non-fs request ignored\n");
 648                return BLK_STS_IOERR;
 649        }
 650}
 651
 652/* Print string identifying GD ROM device */
 653static int gdrom_outputversion(void)
 654{
 655        struct gdrom_id *id;
 656        char *model_name, *manuf_name, *firmw_ver;
 657        int err = -ENOMEM;
 658
 659        /* query device ID */
 660        id = kzalloc(sizeof(struct gdrom_id), GFP_KERNEL);
 661        if (!id)
 662                return err;
 663        gdrom_identifydevice(id);
 664        model_name = kstrndup(id->modname, 16, GFP_KERNEL);
 665        if (!model_name)
 666                goto free_id;
 667        manuf_name = kstrndup(id->mname, 16, GFP_KERNEL);
 668        if (!manuf_name)
 669                goto free_model_name;
 670        firmw_ver = kstrndup(id->firmver, 16, GFP_KERNEL);
 671        if (!firmw_ver)
 672                goto free_manuf_name;
 673        pr_info("%s from %s with firmware %s\n",
 674                model_name, manuf_name, firmw_ver);
 675        err = 0;
 676        kfree(firmw_ver);
 677free_manuf_name:
 678        kfree(manuf_name);
 679free_model_name:
 680        kfree(model_name);
 681free_id:
 682        kfree(id);
 683        return err;
 684}
 685
 686/* set the default mode for DMA transfer */
 687static int gdrom_init_dma_mode(void)
 688{
 689        __raw_writeb(0x13, GDROM_ERROR_REG);
 690        __raw_writeb(0x22, GDROM_INTSEC_REG);
 691        if (!gdrom_wait_clrbusy())
 692                return -EBUSY;
 693        __raw_writeb(0xEF, GDROM_STATUSCOMMAND_REG);
 694        if (!gdrom_wait_busy_sleeps())
 695                return -EBUSY;
 696        /* Memory protection setting for GDROM DMA
 697        * Bits 31 - 16 security: 0x8843
 698        * Bits 15 and 7 reserved (0)
 699        * Bits 14 - 8 start of transfer range in 1 MB blocks OR'ed with 0x80
 700        * Bits 6 - 0 end of transfer range in 1 MB blocks OR'ed with 0x80
 701        * (0x40 | 0x80) = start range at 0x0C000000
 702        * (0x7F | 0x80) = end range at 0x0FFFFFFF */
 703        __raw_writel(0x8843407F, GDROM_DMA_ACCESS_CTRL_REG);
 704        __raw_writel(9, GDROM_DMA_WAIT_REG); /* DMA word setting */
 705        return 0;
 706}
 707
 708static void probe_gdrom_setupcd(void)
 709{
 710        gd.cd_info->ops = &gdrom_ops;
 711        gd.cd_info->capacity = 1;
 712        strcpy(gd.cd_info->name, GDROM_DEV_NAME);
 713        gd.cd_info->mask = CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|
 714                CDC_SELECT_DISC;
 715}
 716
 717static void probe_gdrom_setupdisk(void)
 718{
 719        gd.disk->major = gdrom_major;
 720        gd.disk->first_minor = 1;
 721        gd.disk->minors = 1;
 722        strcpy(gd.disk->disk_name, GDROM_DEV_NAME);
 723}
 724
 725static int probe_gdrom_setupqueue(void)
 726{
 727        blk_queue_logical_block_size(gd.gdrom_rq, GDROM_HARD_SECTOR);
 728        /* using DMA so memory will need to be contiguous */
 729        blk_queue_max_segments(gd.gdrom_rq, 1);
 730        /* set a large max size to get most from DMA */
 731        blk_queue_max_segment_size(gd.gdrom_rq, 0x40000);
 732        gd.disk->queue = gd.gdrom_rq;
 733        return gdrom_init_dma_mode();
 734}
 735
 736static const struct blk_mq_ops gdrom_mq_ops = {
 737        .queue_rq       = gdrom_queue_rq,
 738};
 739
 740/*
 741 * register this as a block device and as compliant with the
 742 * universal CD Rom driver interface
 743 */
 744static int probe_gdrom(struct platform_device *devptr)
 745{
 746        int err;
 747
 748        /*
 749         * Ensure our "one" device is initialized properly in case of previous
 750         * usages of it
 751         */
 752        memset(&gd, 0, sizeof(gd));
 753
 754        /* Start the device */
 755        if (gdrom_execute_diagnostic() != 1) {
 756                pr_warn("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        pr_info("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.disk, gd.cd_info)) {
 782                err = -ENODEV;
 783                goto probe_fail_cdrom_register;
 784        }
 785        gd.disk->fops = &gdrom_bdops;
 786        gd.disk->events = DISK_EVENT_MEDIA_CHANGE;
 787        /* latch on to the interrupt */
 788        err = gdrom_set_interrupt_handlers();
 789        if (err)
 790                goto probe_fail_cmdirq_register;
 791
 792        gd.gdrom_rq = blk_mq_init_sq_queue(&gd.tag_set, &gdrom_mq_ops, 1,
 793                                BLK_MQ_F_SHOULD_MERGE | BLK_MQ_F_BLOCKING);
 794        if (IS_ERR(gd.gdrom_rq)) {
 795                err = PTR_ERR(gd.gdrom_rq);
 796                gd.gdrom_rq = NULL;
 797                goto probe_fail_requestq;
 798        }
 799
 800        err = probe_gdrom_setupqueue();
 801        if (err)
 802                goto probe_fail_toc;
 803
 804        gd.toc = kzalloc(sizeof(struct gdromtoc), GFP_KERNEL);
 805        if (!gd.toc) {
 806                err = -ENOMEM;
 807                goto probe_fail_toc;
 808        }
 809        add_disk(gd.disk);
 810        return 0;
 811
 812probe_fail_toc:
 813        blk_cleanup_queue(gd.gdrom_rq);
 814        blk_mq_free_tag_set(&gd.tag_set);
 815probe_fail_requestq:
 816        free_irq(HW_EVENT_GDROM_DMA, &gd);
 817        free_irq(HW_EVENT_GDROM_CMD, &gd);
 818probe_fail_cmdirq_register:
 819probe_fail_cdrom_register:
 820        del_gendisk(gd.disk);
 821probe_fail_no_disk:
 822        kfree(gd.cd_info);
 823probe_fail_no_mem:
 824        unregister_blkdev(gdrom_major, GDROM_DEV_NAME);
 825        gdrom_major = 0;
 826        pr_warn("Probe failed - error is 0x%X\n", err);
 827        return err;
 828}
 829
 830static int remove_gdrom(struct platform_device *devptr)
 831{
 832        blk_cleanup_queue(gd.gdrom_rq);
 833        blk_mq_free_tag_set(&gd.tag_set);
 834        free_irq(HW_EVENT_GDROM_CMD, &gd);
 835        free_irq(HW_EVENT_GDROM_DMA, &gd);
 836        del_gendisk(gd.disk);
 837        if (gdrom_major)
 838                unregister_blkdev(gdrom_major, GDROM_DEV_NAME);
 839        unregister_cdrom(gd.cd_info);
 840        kfree(gd.cd_info);
 841        kfree(gd.toc);
 842
 843        return 0;
 844}
 845
 846static struct platform_driver gdrom_driver = {
 847        .probe = probe_gdrom,
 848        .remove = remove_gdrom,
 849        .driver = {
 850                        .name = GDROM_DEV_NAME,
 851        },
 852};
 853
 854static int __init init_gdrom(void)
 855{
 856        int rc;
 857
 858        rc = platform_driver_register(&gdrom_driver);
 859        if (rc)
 860                return rc;
 861        pd = platform_device_register_simple(GDROM_DEV_NAME, -1, NULL, 0);
 862        if (IS_ERR(pd)) {
 863                platform_driver_unregister(&gdrom_driver);
 864                return PTR_ERR(pd);
 865        }
 866        return 0;
 867}
 868
 869static void __exit exit_gdrom(void)
 870{
 871        platform_device_unregister(pd);
 872        platform_driver_unregister(&gdrom_driver);
 873}
 874
 875module_init(init_gdrom);
 876module_exit(exit_gdrom);
 877MODULE_AUTHOR("Adrian McMenamin <adrian@mcmen.demon.co.uk>");
 878MODULE_DESCRIPTION("SEGA Dreamcast GD-ROM Driver");
 879MODULE_LICENSE("GPL");
 880