drivers/cdrom/gdrom.c

   1 /* GD ROM driver for the SEGA Dreamcast
   2  * copyright Adrian McMenamin, 2007
   3  * With thanks to Marcus Comstedt and Nathan Keynes
   4  * for work in reversing PIO and DMA
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19  *
  20  */
  21
  22 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  23
  24 #include <linux/init.h>
  25 #include <linux/module.h>
  26 #include <linux/fs.h>
  27 #include <linux/kernel.h>
  28 #include <linux/list.h>
  29 #include <linux/slab.h>
  30 #include <linux/dma-mapping.h>
  31 #include <linux/cdrom.h>
  32 #include <linux/genhd.h>
  33 #include <linux/bio.h>
  34 #include <linux/blk-mq.h>
  35 #include <linux/interrupt.h>
  36 #include <linux/device.h>
  37 #include <linux/mutex.h>
  38 #include <linux/wait.h>
  39 #include <linux/platform_device.h>
  40 #include <scsi/scsi.h>
  41 #include <asm/io.h>
  42 #include <asm/dma.h>
  43 #include <asm/delay.h>
  44 #include <mach/dma.h>
  45 #include <mach/sysasic.h>
  46
  47 #define GDROM_DEV_NAME "gdrom"
  48 #define GD_SESSION_OFFSET 150
  49
  50 /* GD Rom commands */
  51 #define GDROM_COM_SOFTRESET 0x08
  52 #define GDROM_COM_EXECDIAG 0x90
  53 #define GDROM_COM_PACKET 0xA0
  54 #define GDROM_COM_IDDEV 0xA1
  55
  56 /* GD Rom registers */
  57 #define GDROM_BASE_REG                  0xA05F7000
  58 #define GDROM_ALTSTATUS_REG             (GDROM_BASE_REG + 0x18)
  59 #define GDROM_DATA_REG                  (GDROM_BASE_REG + 0x80)
  60 #define GDROM_ERROR_REG         (GDROM_BASE_REG + 0x84)
  61 #define GDROM_INTSEC_REG                (GDROM_BASE_REG + 0x88)
  62 #define GDROM_SECNUM_REG                (GDROM_BASE_REG + 0x8C)
  63 #define GDROM_BCL_REG                   (GDROM_BASE_REG + 0x90)
  64 #define GDROM_BCH_REG                   (GDROM_BASE_REG + 0x94)
  65 #define GDROM_DSEL_REG                  (GDROM_BASE_REG + 0x98)
  66 #define GDROM_STATUSCOMMAND_REG (GDROM_BASE_REG + 0x9C)
  67 #define GDROM_RESET_REG         (GDROM_BASE_REG + 0x4E4)
  68
  69 #define GDROM_DMA_STARTADDR_REG (GDROM_BASE_REG + 0x404)
  70 #define GDROM_DMA_LENGTH_REG            (GDROM_BASE_REG + 0x408)
  71 #define GDROM_DMA_DIRECTION_REG (GDROM_BASE_REG + 0x40C)
  72 #define GDROM_DMA_ENABLE_REG            (GDROM_BASE_REG + 0x414)
  73 #define GDROM_DMA_STATUS_REG            (GDROM_BASE_REG + 0x418)
  74 #define GDROM_DMA_WAIT_REG              (GDROM_BASE_REG + 0x4A0)
  75 #define GDROM_DMA_ACCESS_CTRL_REG       (GDROM_BASE_REG + 0x4B8)
  76
  77 #define GDROM_HARD_SECTOR       2048
  78 #define BLOCK_LAYER_SECTOR      512
  79 #define GD_TO_BLK               4
  80
  81 #define GDROM_DEFAULT_TIMEOUT   (HZ * 7)
  82
  83 static DEFINE_MUTEX(gdrom_mutex);
  84 static const struct {
  85         int sense_key;
  86         const char * const text;
  87 } sense_texts[] = {
  88         {NO_SENSE, "OK"},
  89         {RECOVERED_ERROR, "Recovered from error"},
  90         {NOT_READY, "Device not ready"},
  91         {MEDIUM_ERROR, "Disk not ready"},
  92         {HARDWARE_ERROR, "Hardware error"},
  93         {ILLEGAL_REQUEST, "Command has failed"},
  94         {UNIT_ATTENTION, "Device needs attention - disk may have been changed"},
  95         {DATA_PROTECT, "Data protection error"},
  96         {ABORTED_COMMAND, "Command aborted"},
  97 };
  98
  99 static struct platform_device *pd;
 100 static int gdrom_major;
 101 static DECLARE_WAIT_QUEUE_HEAD(command_queue);
 102 static DECLARE_WAIT_QUEUE_HEAD(request_queue);
 103
 104 struct gdromtoc {
 105         unsigned int entry[99];
 106         unsigned int first, last;
 107         unsigned int leadout;
 108 };
 109
 110 static struct gdrom_unit {
 111         struct gendisk *disk;
 112         struct cdrom_device_info *cd_info;
 113         int status;
 114         int pending;
 115         int transfer;
 116         char disk_type;
 117         struct gdromtoc *toc;
 118         struct request_queue *gdrom_rq;
 119         struct blk_mq_tag_set tag_set;
 120 } gd;
 121
 122 struct gdrom_id {
 123         char mid;
 124         char modid;
 125         char verid;
 126         char padA[13];
 127         char mname[16];
 128         char modname[16];
 129         char firmver[16];
 130         char padB[16];
 131 };
 132
 133 static int gdrom_getsense(short *bufstring);
 134 static int gdrom_packetcommand(struct cdrom_device_info *cd_info,
 135         struct packet_command *command);
 136 static int gdrom_hardreset(struct cdrom_device_info *cd_info);
 137
 138 static bool gdrom_is_busy(void)
 139 {
 140         return (__raw_readb(GDROM_ALTSTATUS_REG) & 0x80) != 0;
 141 }
 142
 143 static bool gdrom_data_request(void)
 144 {
 145         return (__raw_readb(GDROM_ALTSTATUS_REG) & 0x88) == 8;
 146 }
 147
 148 static bool gdrom_wait_clrbusy(void)
 149 {
 150         unsigned long timeout = jiffies + GDROM_DEFAULT_TIMEOUT;
 151         while ((__raw_readb(GDROM_ALTSTATUS_REG) & 0x80) &&
 152                 (time_before(jiffies, timeout)))
 153                 cpu_relax();
 154         return time_before(jiffies, timeout + 1);
 155 }
 156
 157 static bool gdrom_wait_busy_sleeps(void)
 158 {
 159         unsigned long timeout;
 160         /* Wait to get busy first */
 161         timeout = jiffies + GDROM_DEFAULT_TIMEOUT;
 162         while (!gdrom_is_busy() && time_before(jiffies, timeout))
 163                 cpu_relax();
 164         /* Now wait for busy to clear */
 165         return gdrom_wait_clrbusy();
 166 }
 167
 168 static void gdrom_identifydevice(void *buf)
 169 {
 170         int c;
 171         short *data = buf;
 172         /* If the device won't clear it has probably
 173         * been hit by a serious failure - but we'll
 174         * try to return a sense key even so */
 175         if (!gdrom_wait_clrbusy()) {
 176                 gdrom_getsense(NULL);
 177                 return;
 178         }
 179         __raw_writeb(GDROM_COM_IDDEV, GDROM_STATUSCOMMAND_REG);
 180         if (!gdrom_wait_busy_sleeps()) {
 181                 gdrom_getsense(NULL);
 182                 return;
 183         }
 184         /* now read in the data */
 185         for (c = 0; c < 40; c++)
 186                 data[c] = __raw_readw(GDROM_DATA_REG);
 187 }
 188
 189 static void gdrom_spicommand(void *spi_string, int buflen)
 190 {
 191         short *cmd = spi_string;
 192         unsigned long timeout;
 193
 194         /* ensure IRQ_WAIT is set */
 195         __raw_writeb(0x08, GDROM_ALTSTATUS_REG);
 196         /* specify how many bytes we expect back */
 197         __raw_writeb(buflen & 0xFF, GDROM_BCL_REG);
 198         __raw_writeb((buflen >> 8) & 0xFF, GDROM_BCH_REG);
 199         /* other parameters */
 200         __raw_writeb(0, GDROM_INTSEC_REG);
 201         __raw_writeb(0, GDROM_SECNUM_REG);
 202         __raw_writeb(0, GDROM_ERROR_REG);
 203         /* Wait until we can go */
 204         if (!gdrom_wait_clrbusy()) {
 205                 gdrom_getsense(NULL);
 206                 return;
 207         }
 208         timeout = jiffies + GDROM_DEFAULT_TIMEOUT;
 209         __raw_writeb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG);
 210         while (!gdrom_data_request() && time_before(jiffies, timeout))
 211                 cpu_relax();
 212         if (!time_before(jiffies, timeout + 1)) {
 213                 gdrom_getsense(NULL);
 214                 return;
 215         }
 216         outsw(GDROM_DATA_REG, cmd, 6);
 217 }
 218
 219
 220 /* gdrom_command_executediagnostic:
 221  * Used to probe for presence of working GDROM
 222  * Restarts GDROM device and then applies standard ATA 3
 223  * Execute Diagnostic Command: a return of '1' indicates device 0
 224  * present and device 1 absent
 225  */
 226 static char gdrom_execute_diagnostic(void)
 227 {
 228         gdrom_hardreset(gd.cd_info);
 229         if (!gdrom_wait_clrbusy())
 230                 return 0;
 231         __raw_writeb(GDROM_COM_EXECDIAG, GDROM_STATUSCOMMAND_REG);
 232         if (!gdrom_wait_busy_sleeps())
 233                 return 0;
 234         return __raw_readb(GDROM_ERROR_REG);
 235 }
 236
 237 /*
 238  * Prepare disk command
 239  * byte 0 = 0x70
 240  * byte 1 = 0x1f
 241  */
 242 static int gdrom_preparedisk_cmd(void)
 243 {
 244         struct packet_command *spin_command;
 245         spin_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
 246         if (!spin_command)
 247                 return -ENOMEM;
 248         spin_command->cmd[0] = 0x70;
 249         spin_command->cmd[2] = 0x1f;
 250         spin_command->buflen = 0;
 251         gd.pending = 1;
 252         gdrom_packetcommand(gd.cd_info, spin_command);
 253         /* 60 second timeout */
 254         wait_event_interruptible_timeout(command_queue, gd.pending == 0,
 255                 GDROM_DEFAULT_TIMEOUT);
 256         gd.pending = 0;
 257         kfree(spin_command);
 258         if (gd.status & 0x01) {
 259                 /* log an error */
 260                 gdrom_getsense(NULL);
 261                 return -EIO;
 262         }
 263         return 0;
 264 }
 265
 266 /*
 267  * Read TOC command
 268  * byte 0 = 0x14
 269  * byte 1 = session
 270  * byte 3 = sizeof TOC >> 8  ie upper byte
 271  * byte 4 = sizeof TOC & 0xff ie lower byte
 272  */
 273 static int gdrom_readtoc_cmd(struct gdromtoc *toc, int session)
 274 {
 275         int tocsize;
 276         struct packet_command *toc_command;
 277         int err = 0;
 278
 279         toc_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
 280         if (!toc_command)
 281                 return -ENOMEM;
 282         tocsize = sizeof(struct gdromtoc);
 283         toc_command->cmd[0] = 0x14;
 284         toc_command->cmd[1] = session;
 285         toc_command->cmd[3] = tocsize >> 8;
 286         toc_command->cmd[4] = tocsize & 0xff;
 287         toc_command->buflen = tocsize;
 288         if (gd.pending) {
 289                 err = -EBUSY;
 290                 goto cleanup_readtoc_final;
 291         }
 292         gd.pending = 1;
 293         gdrom_packetcommand(gd.cd_info, toc_command);
 294         wait_event_interruptible_timeout(command_queue, gd.pending == 0,
 295                 GDROM_DEFAULT_TIMEOUT);
 296         if (gd.pending) {
 297                 err = -EINVAL;
 298                 goto cleanup_readtoc;
 299         }
 300         insw(GDROM_DATA_REG, toc, tocsize/2);
 301         if (gd.status & 0x01)
 302                 err = -EINVAL;
 303
 304 cleanup_readtoc:
 305         gd.pending = 0;
 306 cleanup_readtoc_final:
 307         kfree(toc_command);
 308         return err;
 309 }
 310
 311 /* TOC helpers */
 312 static int get_entry_lba(int track)
 313 {
 314         return (cpu_to_be32(track & 0xffffff00) - GD_SESSION_OFFSET);
 315 }
 316
 317 static int get_entry_q_ctrl(int track)
 318 {
 319         return (track & 0x000000f0) >> 4;
 320 }
 321
 322 static int get_entry_track(int track)
 323 {
 324         return (track & 0x0000ff00) >> 8;
 325 }
 326
 327 static int gdrom_get_last_session(struct cdrom_device_info *cd_info,
 328         struct cdrom_multisession *ms_info)
 329 {
 330         int fentry, lentry, track, data, err;
 331
 332         if (!gd.toc)
 333                 return -ENOMEM;
 334
 335         /* Check if GD-ROM */
 336         err = gdrom_readtoc_cmd(gd.toc, 1);
 337         /* Not a GD-ROM so check if standard CD-ROM */
 338         if (err) {
 339                 err = gdrom_readtoc_cmd(gd.toc, 0);
 340                 if (err) {
 341                         pr_info("Could not get CD table of contents\n");
 342                         return -ENXIO;
 343                 }
 344         }
 345
 346         fentry = get_entry_track(gd.toc->first);
 347         lentry = get_entry_track(gd.toc->last);
 348         /* Find the first data track */
 349         track = get_entry_track(gd.toc->last);
 350         do {
 351                 data = gd.toc->entry[track - 1];
 352                 if (get_entry_q_ctrl(data))
 353                         break;  /* ie a real data track */
 354                 track--;
 355         } while (track >= fentry);
 356
 357         if ((track > 100) || (track < get_entry_track(gd.toc->first))) {
 358                 pr_info("No data on the last session of the CD\n");
 359                 gdrom_getsense(NULL);
 360                 return -ENXIO;
 361         }
 362
 363         ms_info->addr_format = CDROM_LBA;
 364         ms_info->addr.lba = get_entry_lba(data);
 365         ms_info->xa_flag = 1;
 366         return 0;
 367 }
 368
 369 static int gdrom_open(struct cdrom_device_info *cd_info, int purpose)
 370 {
 371         /* spin up the disk */
 372         return gdrom_preparedisk_cmd();
 373 }
 374
 375 /* this function is required even if empty */
 376 static void gdrom_release(struct cdrom_device_info *cd_info)
 377 {
 378 }
 379
 380 static int gdrom_drivestatus(struct cdrom_device_info *cd_info, int ignore)
 381 {
 382         /* read the sense key */
 383         char sense = __raw_readb(GDROM_ERROR_REG);
 384         sense &= 0xF0;
 385         if (sense == 0)
 386                 return CDS_DISC_OK;
 387         if (sense == 0x20)
 388                 return CDS_DRIVE_NOT_READY;
 389         /* default */
 390         return CDS_NO_INFO;
 391 }
 392
 393 static unsigned int gdrom_check_events(struct cdrom_device_info *cd_info,
 394                                        unsigned int clearing, int ignore)
 395 {
 396         /* check the sense key */
 397         return (__raw_readb(GDROM_ERROR_REG) & 0xF0) == 0x60 ?
 398                 DISK_EVENT_MEDIA_CHANGE : 0;
 399 }
 400
 401 /* reset the G1 bus */
 402 static int gdrom_hardreset(struct cdrom_device_info *cd_info)
 403 {
 404         int count;
 405         __raw_writel(0x1fffff, GDROM_RESET_REG);
 406         for (count = 0xa0000000; count < 0xa0200000; count += 4)
 407                 __raw_readl(count);
 408         return 0;
 409 }
 410
 411 /* keep the function looking like the universal
 412  * CD Rom specification  - returning int */
 413 static int gdrom_packetcommand(struct cdrom_device_info *cd_info,
 414         struct packet_command *command)
 415 {
 416         gdrom_spicommand(&command->cmd, command->buflen);
 417         return 0;
 418 }
 419
 420 /* Get Sense SPI command
 421  * From Marcus Comstedt
 422  * cmd = 0x13
 423  * cmd + 4 = length of returned buffer
 424  * Returns 5 16 bit words
 425  */
 426 static int gdrom_getsense(short *bufstring)
 427 {
 428         struct packet_command *sense_command;
 429         short sense[5];
 430         int sense_key;
 431         int err = -EIO;
 432
 433         sense_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
 434         if (!sense_command)
 435                 return -ENOMEM;
 436         sense_command->cmd[0] = 0x13;
 437         sense_command->cmd[4] = 10;
 438         sense_command->buflen = 10;
 439         /* even if something is pending try to get
 440         * the sense key if possible */
 441         if (gd.pending && !gdrom_wait_clrbusy()) {
 442                 err = -EBUSY;
 443                 goto cleanup_sense_final;
 444         }
 445         gd.pending = 1;
 446         gdrom_packetcommand(gd.cd_info, sense_command);
 447         wait_event_interruptible_timeout(command_queue, gd.pending == 0,
 448                 GDROM_DEFAULT_TIMEOUT);
 449         if (gd.pending)
 450                 goto cleanup_sense;
 451         insw(GDROM_DATA_REG, &sense, sense_command->buflen/2);
 452         if (sense[1] & 40) {
 453                 pr_info("Drive not ready - command aborted\n");
 454                 goto cleanup_sense;
 455         }
 456         sense_key = sense[1] & 0x0F;
 457         if (sense_key < ARRAY_SIZE(sense_texts))
 458                 pr_info("%s\n", sense_texts[sense_key].text);
 459         else
 460                 pr_err("Unknown sense key: %d\n", sense_key);
 461         if (bufstring) /* return addional sense data */
 462                 memcpy(bufstring, &sense[4], 2);
 463         if (sense_key < 2)
 464                 err = 0;
 465
 466 cleanup_sense:
 467         gd.pending = 0;
 468 cleanup_sense_final:
 469         kfree(sense_command);
 470         return err;
 471 }
 472
 473 static int gdrom_audio_ioctl(struct cdrom_device_info *cdi, unsigned int cmd,
 474                              void *arg)
 475 {
 476         return -EINVAL;
 477 }
 478
 479 static const struct cdrom_device_ops gdrom_ops = {
 480         .open                   = gdrom_open,
 481         .release                = gdrom_release,
 482         .drive_status           = gdrom_drivestatus,
 483         .check_events           = gdrom_check_events,
 484         .get_last_session       = gdrom_get_last_session,
 485         .reset                  = gdrom_hardreset,
 486         .audio_ioctl            = gdrom_audio_ioctl,
 487         .generic_packet         = cdrom_dummy_generic_packet,
 488         .capability             = CDC_MULTI_SESSION | CDC_MEDIA_CHANGED |
 489                                   CDC_RESET | CDC_DRIVE_STATUS | CDC_CD_R,
 490 };
 491
 492 static int gdrom_bdops_open(struct block_device *bdev, fmode_t mode)
 493 {
 494         int ret;
 495
 496         check_disk_change(bdev);
 497
 498         mutex_lock(&gdrom_mutex);
 499         ret = cdrom_open(gd.cd_info, bdev, mode);
 500         mutex_unlock(&gdrom_mutex);
 501         return ret;
 502 }
 503
 504 static void gdrom_bdops_release(struct gendisk *disk, fmode_t mode)
 505 {
 506         mutex_lock(&gdrom_mutex);
 507         cdrom_release(gd.cd_info, mode);
 508         mutex_unlock(&gdrom_mutex);
 509 }
 510
 511 static unsigned int gdrom_bdops_check_events(struct gendisk *disk,
 512                                              unsigned int clearing)
 513 {
 514         return cdrom_check_events(gd.cd_info, clearing);
 515 }
 516
 517 static int gdrom_bdops_ioctl(struct block_device *bdev, fmode_t mode,
 518         unsigned cmd, unsigned long arg)
 519 {
 520         int ret;
 521
 522         mutex_lock(&gdrom_mutex);
 523         ret = cdrom_ioctl(gd.cd_info, bdev, mode, cmd, arg);
 524         mutex_unlock(&gdrom_mutex);
 525
 526         return ret;
 527 }
 528
 529 static const struct block_device_operations gdrom_bdops = {
 530         .owner                  = THIS_MODULE,
 531         .open                   = gdrom_bdops_open,
 532         .release                = gdrom_bdops_release,
 533         .check_events           = gdrom_bdops_check_events,
 534         .ioctl                  = gdrom_bdops_ioctl,
 535 };
 536
 537 static irqreturn_t gdrom_command_interrupt(int irq, void *dev_id)
 538 {
 539         gd.status = __raw_readb(GDROM_STATUSCOMMAND_REG);
 540         if (gd.pending != 1)
 541                 return IRQ_HANDLED;
 542         gd.pending = 0;
 543         wake_up_interruptible(&command_queue);
 544         return IRQ_HANDLED;
 545 }
 546
 547 static irqreturn_t gdrom_dma_interrupt(int irq, void *dev_id)
 548 {
 549         gd.status = __raw_readb(GDROM_STATUSCOMMAND_REG);
 550         if (gd.transfer != 1)
 551                 return IRQ_HANDLED;
 552         gd.transfer = 0;
 553         wake_up_interruptible(&request_queue);
 554         return IRQ_HANDLED;
 555 }
 556
 557 static int gdrom_set_interrupt_handlers(void)
 558 {
 559         int err;
 560
 561         err = request_irq(HW_EVENT_GDROM_CMD, gdrom_command_interrupt,
 562                 0, "gdrom_command", &gd);
 563         if (err)
 564                 return err;
 565         err = request_irq(HW_EVENT_GDROM_DMA, gdrom_dma_interrupt,
 566                 0, "gdrom_dma", &gd);
 567         if (err)
 568                 free_irq(HW_EVENT_GDROM_CMD, &gd);
 569         return err;
 570 }
 571
 572 /* Implement DMA read using SPI command
 573  * 0 -> 0x30
 574  * 1 -> mode
 575  * 2 -> block >> 16
 576  * 3 -> block >> 8
 577  * 4 -> block
 578  * 8 -> sectors >> 16
 579  * 9 -> sectors >> 8
 580  * 10 -> sectors
 581  */
 582 static blk_status_t gdrom_readdisk_dma(struct request *req)
 583 {
 584         int block, block_cnt;
 585         blk_status_t err;
 586         struct packet_command *read_command;
 587         unsigned long timeout;
 588
 589         read_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
 590         if (!read_command)
 591                 return BLK_STS_RESOURCE;
 592
 593         read_command->cmd[0] = 0x30;
 594         read_command->cmd[1] = 0x20;
 595         block = blk_rq_pos(req)/GD_TO_BLK + GD_SESSION_OFFSET;
 596         block_cnt = blk_rq_sectors(req)/GD_TO_BLK;
 597         __raw_writel(virt_to_phys(bio_data(req->bio)), GDROM_DMA_STARTADDR_REG);
 598         __raw_writel(block_cnt * GDROM_HARD_SECTOR, GDROM_DMA_LENGTH_REG);
 599         __raw_writel(1, GDROM_DMA_DIRECTION_REG);
 600         __raw_writel(1, GDROM_DMA_ENABLE_REG);
 601         read_command->cmd[2] = (block >> 16) & 0xFF;
 602         read_command->cmd[3] = (block >> 8) & 0xFF;
 603         read_command->cmd[4] = block & 0xFF;
 604         read_command->cmd[8] = (block_cnt >> 16) & 0xFF;
 605         read_command->cmd[9] = (block_cnt >> 8) & 0xFF;
 606         read_command->cmd[10] = block_cnt & 0xFF;
 607         /* set for DMA */
 608         __raw_writeb(1, GDROM_ERROR_REG);
 609         /* other registers */
 610         __raw_writeb(0, GDROM_SECNUM_REG);
 611         __raw_writeb(0, GDROM_BCL_REG);
 612         __raw_writeb(0, GDROM_BCH_REG);
 613         __raw_writeb(0, GDROM_DSEL_REG);
 614         __raw_writeb(0, GDROM_INTSEC_REG);
 615         /* Wait for registers to reset after any previous activity */
 616         timeout = jiffies + HZ / 2;
 617         while (gdrom_is_busy() && time_before(jiffies, timeout))
 618                 cpu_relax();
 619         __raw_writeb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG);
 620         timeout = jiffies + HZ / 2;
 621         /* Wait for packet command to finish */
 622         while (gdrom_is_busy() && time_before(jiffies, timeout))
 623                 cpu_relax();
 624         gd.pending = 1;
 625         gd.transfer = 1;
 626         outsw(GDROM_DATA_REG, &read_command->cmd, 6);
 627         timeout = jiffies + HZ / 2;
 628         /* Wait for any pending DMA to finish */
 629         while (__raw_readb(GDROM_DMA_STATUS_REG) &&
 630                 time_before(jiffies, timeout))
 631                 cpu_relax();
 632         /* start transfer */
 633         __raw_writeb(1, GDROM_DMA_STATUS_REG);
 634         wait_event_interruptible_timeout(request_queue,
 635                 gd.transfer == 0, GDROM_DEFAULT_TIMEOUT);
 636         err = gd.transfer ? BLK_STS_IOERR : BLK_STS_OK;
 637         gd.transfer = 0;
 638         gd.pending = 0;
 639
 640         blk_mq_end_request(req, err);
 641         kfree(read_command);
 642         return BLK_STS_OK;
 643 }
 644
 645 static blk_status_t gdrom_queue_rq(struct blk_mq_hw_ctx *hctx,
 646                                    const struct blk_mq_queue_data *bd)
 647 {
 648         blk_mq_start_request(bd->rq);
 649
 650         switch (req_op(bd->rq)) {
 651         case REQ_OP_READ:
 652                 return gdrom_readdisk_dma(bd->rq);
 653         case REQ_OP_WRITE:
 654                 pr_notice("Read only device - write request ignored\n");
 655                 return BLK_STS_IOERR;
 656         default:
 657                 printk(KERN_DEBUG "gdrom: Non-fs request ignored\n");
 658                 return BLK_STS_IOERR;
 659         }
 660 }
 661
 662 /* Print string identifying GD ROM device */
 663 static int gdrom_outputversion(void)
 664 {
 665         struct gdrom_id *id;
 666         char *model_name, *manuf_name, *firmw_ver;
 667         int err = -ENOMEM;
 668
 669         /* query device ID */
 670         id = kzalloc(sizeof(struct gdrom_id), GFP_KERNEL);
 671         if (!id)
 672                 return err;
 673         gdrom_identifydevice(id);
 674         model_name = kstrndup(id->modname, 16, GFP_KERNEL);
 675         if (!model_name)
 676                 goto free_id;
 677         manuf_name = kstrndup(id->mname, 16, GFP_KERNEL);
 678         if (!manuf_name)
 679                 goto free_model_name;
 680         firmw_ver = kstrndup(id->firmver, 16, GFP_KERNEL);
 681         if (!firmw_ver)
 682                 goto free_manuf_name;
 683         pr_info("%s from %s with firmware %s\n",
 684                 model_name, manuf_name, firmw_ver);
 685         err = 0;
 686         kfree(firmw_ver);
 687 free_manuf_name:
 688         kfree(manuf_name);
 689 free_model_name:
 690         kfree(model_name);
 691 free_id:
 692         kfree(id);
 693         return err;
 694 }
 695
 696 /* set the default mode for DMA transfer */
 697 static int gdrom_init_dma_mode(void)
 698 {
 699         __raw_writeb(0x13, GDROM_ERROR_REG);
 700         __raw_writeb(0x22, GDROM_INTSEC_REG);
 701         if (!gdrom_wait_clrbusy())
 702                 return -EBUSY;
 703         __raw_writeb(0xEF, GDROM_STATUSCOMMAND_REG);
 704         if (!gdrom_wait_busy_sleeps())
 705                 return -EBUSY;
 706         /* Memory protection setting for GDROM DMA
 707         * Bits 31 - 16 security: 0x8843
 708         * Bits 15 and 7 reserved (0)
 709         * Bits 14 - 8 start of transfer range in 1 MB blocks OR'ed with 0x80
 710         * Bits 6 - 0 end of transfer range in 1 MB blocks OR'ed with 0x80
 711         * (0x40 | 0x80) = start range at 0x0C000000
 712         * (0x7F | 0x80) = end range at 0x0FFFFFFF */
 713         __raw_writel(0x8843407F, GDROM_DMA_ACCESS_CTRL_REG);
 714         __raw_writel(9, GDROM_DMA_WAIT_REG); /* DMA word setting */
 715         return 0;
 716 }
 717
 718 static void probe_gdrom_setupcd(void)
 719 {
 720         gd.cd_info->ops = &gdrom_ops;
 721         gd.cd_info->capacity = 1;
 722         strcpy(gd.cd_info->name, GDROM_DEV_NAME);
 723         gd.cd_info->mask = CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|
 724                 CDC_SELECT_DISC;
 725 }
 726
 727 static void probe_gdrom_setupdisk(void)
 728 {
 729         gd.disk->major = gdrom_major;
 730         gd.disk->first_minor = 1;
 731         gd.disk->minors = 1;
 732         strcpy(gd.disk->disk_name, GDROM_DEV_NAME);
 733 }
 734
 735 static int probe_gdrom_setupqueue(void)
 736 {
 737         blk_queue_logical_block_size(gd.gdrom_rq, GDROM_HARD_SECTOR);
 738         /* using DMA so memory will need to be contiguous */
 739         blk_queue_max_segments(gd.gdrom_rq, 1);
 740         /* set a large max size to get most from DMA */
 741         blk_queue_max_segment_size(gd.gdrom_rq, 0x40000);
 742         gd.disk->queue = gd.gdrom_rq;
 743         return gdrom_init_dma_mode();
 744 }
 745
 746 static const struct blk_mq_ops gdrom_mq_ops = {
 747         .queue_rq       = gdrom_queue_rq,
 748 };
 749
 750 /*
 751  * register this as a block device and as compliant with the
 752  * universal CD Rom driver interface
 753  */
 754 static int probe_gdrom(struct platform_device *devptr)
 755 {
 756         int err;
 757         /* Start the device */
 758         if (gdrom_execute_diagnostic() != 1) {
 759                 pr_warning("ATA Probe for GDROM failed\n");
 760                 return -ENODEV;
 761         }
 762         /* Print out firmware ID */
 763         if (gdrom_outputversion())
 764                 return -ENOMEM;
 765         /* Register GDROM */
 766         gdrom_major = register_blkdev(0, GDROM_DEV_NAME);
 767         if (gdrom_major <= 0)
 768                 return gdrom_major;
 769         pr_info("Registered with major number %d\n",
 770                 gdrom_major);
 771         /* Specify basic properties of drive */
 772         gd.cd_info = kzalloc(sizeof(struct cdrom_device_info), GFP_KERNEL);
 773         if (!gd.cd_info) {
 774                 err = -ENOMEM;
 775                 goto probe_fail_no_mem;
 776         }
 777         probe_gdrom_setupcd();
 778         gd.disk = alloc_disk(1);
 779         if (!gd.disk) {
 780                 err = -ENODEV;
 781                 goto probe_fail_no_disk;
 782         }
 783         probe_gdrom_setupdisk();
 784         if (register_cdrom(gd.cd_info)) {
 785                 err = -ENODEV;
 786                 goto probe_fail_cdrom_register;
 787         }
 788         gd.disk->fops = &gdrom_bdops;
 789         /* latch on to the interrupt */
 790         err = gdrom_set_interrupt_handlers();
 791         if (err)
 792                 goto probe_fail_cmdirq_register;
 793
 794         gd.gdrom_rq = blk_mq_init_sq_queue(&gd.tag_set, &gdrom_mq_ops, 1,
 795                                 BLK_MQ_F_SHOULD_MERGE | BLK_MQ_F_BLOCKING);
 796         if (IS_ERR(gd.gdrom_rq)) {
 797                 err = PTR_ERR(gd.gdrom_rq);
 798                 gd.gdrom_rq = NULL;
 799                 goto probe_fail_requestq;
 800         }
 801
 802         blk_queue_bounce_limit(gd.gdrom_rq, BLK_BOUNCE_HIGH);
 803
 804         err = probe_gdrom_setupqueue();
 805         if (err)
 806                 goto probe_fail_toc;
 807
 808         gd.toc = kzalloc(sizeof(struct gdromtoc), GFP_KERNEL);
 809         if (!gd.toc) {
 810                 err = -ENOMEM;
 811                 goto probe_fail_toc;
 812         }
 813         add_disk(gd.disk);
 814         return 0;
 815
 816 probe_fail_toc:
 817         blk_cleanup_queue(gd.gdrom_rq);
 818         blk_mq_free_tag_set(&gd.tag_set);
 819 probe_fail_requestq:
 820         free_irq(HW_EVENT_GDROM_DMA, &gd);
 821         free_irq(HW_EVENT_GDROM_CMD, &gd);
 822 probe_fail_cmdirq_register:
 823 probe_fail_cdrom_register:
 824         del_gendisk(gd.disk);
 825 probe_fail_no_disk:
 826         kfree(gd.cd_info);
 827 probe_fail_no_mem:
 828         unregister_blkdev(gdrom_major, GDROM_DEV_NAME);
 829         gdrom_major = 0;
 830         pr_warning("Probe failed - error is 0x%X\n", err);
 831         return err;
 832 }
 833
 834 static int remove_gdrom(struct platform_device *devptr)
 835 {
 836         blk_cleanup_queue(gd.gdrom_rq);
 837         blk_mq_free_tag_set(&gd.tag_set);
 838         free_irq(HW_EVENT_GDROM_CMD, &gd);
 839         free_irq(HW_EVENT_GDROM_DMA, &gd);
 840         del_gendisk(gd.disk);
 841         if (gdrom_major)
 842                 unregister_blkdev(gdrom_major, GDROM_DEV_NAME);
 843         unregister_cdrom(gd.cd_info);
 844
 845         return 0;
 846 }
 847
 848 static struct platform_driver gdrom_driver = {
 849         .probe = probe_gdrom,
 850         .remove = remove_gdrom,
 851         .driver = {
 852                         .name = GDROM_DEV_NAME,
 853         },
 854 };
 855
 856 static int __init init_gdrom(void)
 857 {
 858         int rc;
 859         gd.toc = NULL;
 860         rc = platform_driver_register(&gdrom_driver);
 861         if (rc)
 862                 return rc;
 863         pd = platform_device_register_simple(GDROM_DEV_NAME, -1, NULL, 0);
 864         if (IS_ERR(pd)) {
 865                 platform_driver_unregister(&gdrom_driver);
 866                 return PTR_ERR(pd);
 867         }
 868         return 0;
 869 }
 870
 871 static void __exit exit_gdrom(void)
 872 {
 873         platform_device_unregister(pd);
 874         platform_driver_unregister(&gdrom_driver);
 875         kfree(gd.toc);
 876         kfree(gd.cd_info);
 877 }
 878
 879 module_init(init_gdrom);
 880 module_exit(exit_gdrom);
 881 MODULE_AUTHOR("Adrian McMenamin <adrian@mcmen.demon.co.uk>");
 882 MODULE_DESCRIPTION("SEGA Dreamcast GD-ROM Driver");
 883 MODULE_LICENSE("GPL");