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
 
   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.
 
  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.
 
  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.
 
  22 #include <linux/init.h>
 
  23 #include <linux/module.h>
 
  25 #include <linux/kernel.h>
 
  26 #include <linux/list.h>
 
  27 #include <linux/slab.h>
 
  28 #include <linux/dma-mapping.h>
 
  29 #include <linux/cdrom.h>
 
  30 #include <linux/genhd.h>
 
  31 #include <linux/bio.h>
 
  32 #include <linux/blkdev.h>
 
  33 #include <linux/interrupt.h>
 
  34 #include <linux/device.h>
 
  35 #include <linux/wait.h>
 
  36 #include <linux/workqueue.h>
 
  37 #include <linux/platform_device.h>
 
  38 #include <scsi/scsi.h>
 
  41 #include <asm/delay.h>
 
  42 #include <asm/mach/dma.h>
 
  43 #include <asm/mach/sysasic.h>
 
  45 #define GDROM_DEV_NAME "gdrom"
 
  46 #define GD_SESSION_OFFSET 150
 
  49 #define GDROM_COM_SOFTRESET 0x08
 
  50 #define GDROM_COM_EXECDIAG 0x90
 
  51 #define GDROM_COM_PACKET 0xA0
 
  52 #define GDROM_COM_IDDEV 0xA1
 
  54 /* GD Rom registers */
 
  55 #define GDROM_BASE_REG                  0xA05F7000
 
  56 #define GDROM_ALTSTATUS_REG             (GDROM_BASE_REG + 0x18)
 
  57 #define GDROM_DATA_REG                  (GDROM_BASE_REG + 0x80)
 
  58 #define GDROM_ERROR_REG         (GDROM_BASE_REG + 0x84)
 
  59 #define GDROM_INTSEC_REG                (GDROM_BASE_REG + 0x88)
 
  60 #define GDROM_SECNUM_REG                (GDROM_BASE_REG + 0x8C)
 
  61 #define GDROM_BCL_REG                   (GDROM_BASE_REG + 0x90)
 
  62 #define GDROM_BCH_REG                   (GDROM_BASE_REG + 0x94)
 
  63 #define GDROM_DSEL_REG                  (GDROM_BASE_REG + 0x98)
 
  64 #define GDROM_STATUSCOMMAND_REG (GDROM_BASE_REG + 0x9C)
 
  65 #define GDROM_RESET_REG         (GDROM_BASE_REG + 0x4E4)
 
  67 #define GDROM_DMA_STARTADDR_REG (GDROM_BASE_REG + 0x404)
 
  68 #define GDROM_DMA_LENGTH_REG            (GDROM_BASE_REG + 0x408)
 
  69 #define GDROM_DMA_DIRECTION_REG (GDROM_BASE_REG + 0x40C)
 
  70 #define GDROM_DMA_ENABLE_REG            (GDROM_BASE_REG + 0x414)
 
  71 #define GDROM_DMA_STATUS_REG            (GDROM_BASE_REG + 0x418)
 
  72 #define GDROM_DMA_WAIT_REG              (GDROM_BASE_REG + 0x4A0)
 
  73 #define GDROM_DMA_ACCESS_CTRL_REG       (GDROM_BASE_REG + 0x4B8)
 
  75 #define GDROM_HARD_SECTOR       2048
 
  76 #define BLOCK_LAYER_SECTOR      512
 
  79 #define GDROM_DEFAULT_TIMEOUT   (HZ * 7)
 
  83         const char * const text;
 
  86         {RECOVERED_ERROR, "Recovered from error"},
 
  87         {NOT_READY, "Device not ready"},
 
  88         {MEDIUM_ERROR, "Disk not ready"},
 
  89         {HARDWARE_ERROR, "Hardware error"},
 
  90         {ILLEGAL_REQUEST, "Command has failed"},
 
  91         {UNIT_ATTENTION, "Device needs attention - disk may have been changed"},
 
  92         {DATA_PROTECT, "Data protection error"},
 
  93         {ABORTED_COMMAND, "Command aborted"},
 
  96 static struct platform_device *pd;
 
  97 static int gdrom_major;
 
  98 static DECLARE_WAIT_QUEUE_HEAD(command_queue);
 
  99 static DECLARE_WAIT_QUEUE_HEAD(request_queue);
 
 101 static DEFINE_SPINLOCK(gdrom_lock);
 
 102 static void gdrom_readdisk_dma(struct work_struct *work);
 
 103 static DECLARE_WORK(work, gdrom_readdisk_dma);
 
 104 static LIST_HEAD(gdrom_deferred);
 
 107         unsigned int entry[99];
 
 108         unsigned int first, last;
 
 109         unsigned int leadout;
 
 112 static struct gdrom_unit {
 
 113         struct gendisk *disk;
 
 114         struct cdrom_device_info *cd_info;
 
 119         struct gdromtoc *toc;
 
 120         struct request_queue *gdrom_rq;
 
 134 static int gdrom_getsense(short *bufstring);
 
 135 static int gdrom_packetcommand(struct cdrom_device_info *cd_info,
 
 136         struct packet_command *command);
 
 137 static int gdrom_hardreset(struct cdrom_device_info *cd_info);
 
 139 static bool gdrom_is_busy(void)
 
 141         return (ctrl_inb(GDROM_ALTSTATUS_REG) & 0x80) != 0;
 
 144 static bool gdrom_data_request(void)
 
 146         return (ctrl_inb(GDROM_ALTSTATUS_REG) & 0x88) == 8;
 
 149 static bool gdrom_wait_clrbusy(void)
 
 151         unsigned long timeout = jiffies + GDROM_DEFAULT_TIMEOUT;
 
 152         while ((ctrl_inb(GDROM_ALTSTATUS_REG) & 0x80) &&
 
 153                 (time_before(jiffies, timeout)))
 
 155         return time_before(jiffies, timeout + 1);
 
 158 static bool gdrom_wait_busy_sleeps(void)
 
 160         unsigned long timeout;
 
 161         /* Wait to get busy first */
 
 162         timeout = jiffies + GDROM_DEFAULT_TIMEOUT;
 
 163         while (!gdrom_is_busy() && time_before(jiffies, timeout))
 
 165         /* Now wait for busy to clear */
 
 166         return gdrom_wait_clrbusy();
 
 169 static void gdrom_identifydevice(void *buf)
 
 173         /* If the device won't clear it has probably
 
 174         * been hit by a serious failure - but we'll
 
 175         * try to return a sense key even so */
 
 176         if (!gdrom_wait_clrbusy()) {
 
 177                 gdrom_getsense(NULL);
 
 180         ctrl_outb(GDROM_COM_IDDEV, GDROM_STATUSCOMMAND_REG);
 
 181         if (!gdrom_wait_busy_sleeps()) {
 
 182                 gdrom_getsense(NULL);
 
 185         /* now read in the data */
 
 186         for (c = 0; c < 40; c++)
 
 187                 data[c] = ctrl_inw(GDROM_DATA_REG);
 
 190 static void gdrom_spicommand(void *spi_string, int buflen)
 
 192         short *cmd = spi_string;
 
 193         unsigned long timeout;
 
 195         /* ensure IRQ_WAIT is set */
 
 196         ctrl_outb(0x08, GDROM_ALTSTATUS_REG);
 
 197         /* specify how many bytes we expect back */
 
 198         ctrl_outb(buflen & 0xFF, GDROM_BCL_REG);
 
 199         ctrl_outb((buflen >> 8) & 0xFF, GDROM_BCH_REG);
 
 200         /* other parameters */
 
 201         ctrl_outb(0, GDROM_INTSEC_REG);
 
 202         ctrl_outb(0, GDROM_SECNUM_REG);
 
 203         ctrl_outb(0, GDROM_ERROR_REG);
 
 204         /* Wait until we can go */
 
 205         if (!gdrom_wait_clrbusy()) {
 
 206                 gdrom_getsense(NULL);
 
 209         timeout = jiffies + GDROM_DEFAULT_TIMEOUT;
 
 210         ctrl_outb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG);
 
 211         while (!gdrom_data_request() && time_before(jiffies, timeout))
 
 213         if (!time_before(jiffies, timeout + 1)) {
 
 214                 gdrom_getsense(NULL);
 
 217         outsw(PHYSADDR(GDROM_DATA_REG), cmd, 6);
 
 221 /* gdrom_command_executediagnostic:
 
 222  * Used to probe for presence of working GDROM
 
 223  * Restarts GDROM device and then applies standard ATA 3
 
 224  * Execute Diagnostic Command: a return of '1' indicates device 0
 
 225  * present and device 1 absent
 
 227 static char gdrom_execute_diagnostic(void)
 
 229         gdrom_hardreset(gd.cd_info);
 
 230         if (!gdrom_wait_clrbusy())
 
 232         ctrl_outb(GDROM_COM_EXECDIAG, GDROM_STATUSCOMMAND_REG);
 
 233         if (!gdrom_wait_busy_sleeps())
 
 235         return ctrl_inb(GDROM_ERROR_REG);
 
 239  * Prepare disk command
 
 243 static int gdrom_preparedisk_cmd(void)
 
 245         struct packet_command *spin_command;
 
 246         spin_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
 
 249         spin_command->cmd[0] = 0x70;
 
 250         spin_command->cmd[2] = 0x1f;
 
 251         spin_command->buflen = 0;
 
 253         gdrom_packetcommand(gd.cd_info, spin_command);
 
 254         /* 60 second timeout */
 
 255         wait_event_interruptible_timeout(command_queue, gd.pending == 0,
 
 256                 GDROM_DEFAULT_TIMEOUT);
 
 259         if (gd.status & 0x01) {
 
 261                 gdrom_getsense(NULL);
 
 271  * byte 3 = sizeof TOC >> 8  ie upper byte
 
 272  * byte 4 = sizeof TOC & 0xff ie lower byte
 
 274 static int gdrom_readtoc_cmd(struct gdromtoc *toc, int session)
 
 277         struct packet_command *toc_command;
 
 280         toc_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
 
 283         tocsize = sizeof(struct gdromtoc);
 
 284         toc_command->cmd[0] = 0x14;
 
 285         toc_command->cmd[1] = session;
 
 286         toc_command->cmd[3] = tocsize >> 8;
 
 287         toc_command->cmd[4] = tocsize & 0xff;
 
 288         toc_command->buflen = tocsize;
 
 291                 goto cleanup_readtoc_final;
 
 294         gdrom_packetcommand(gd.cd_info, toc_command);
 
 295         wait_event_interruptible_timeout(command_queue, gd.pending == 0,
 
 296                 GDROM_DEFAULT_TIMEOUT);
 
 299                 goto cleanup_readtoc;
 
 301         insw(PHYSADDR(GDROM_DATA_REG), toc, tocsize/2);
 
 302         if (gd.status & 0x01)
 
 307 cleanup_readtoc_final:
 
 313 static int get_entry_lba(int track)
 
 315         return (cpu_to_be32(track & 0xffffff00) - GD_SESSION_OFFSET);
 
 318 static int get_entry_q_ctrl(int track)
 
 320         return (track & 0x000000f0) >> 4;
 
 323 static int get_entry_track(int track)
 
 325         return (track & 0x0000ff00) >> 8;
 
 328 static int gdrom_get_last_session(struct cdrom_device_info *cd_info,
 
 329         struct cdrom_multisession *ms_info)
 
 331         int fentry, lentry, track, data, tocuse, err;
 
 335         /* Check if GD-ROM */
 
 336         err = gdrom_readtoc_cmd(gd.toc, 1);
 
 337         /* Not a GD-ROM so check if standard CD-ROM */
 
 340                 err = gdrom_readtoc_cmd(gd.toc, 0);
 
 342                         printk(KERN_INFO "GDROM: Could not get CD "
 
 343                                 "table of contents\n");
 
 348         fentry = get_entry_track(gd.toc->first);
 
 349         lentry = get_entry_track(gd.toc->last);
 
 350         /* Find the first data track */
 
 351         track = get_entry_track(gd.toc->last);
 
 353                 data = gd.toc->entry[track - 1];
 
 354                 if (get_entry_q_ctrl(data))
 
 355                         break;  /* ie a real data track */
 
 357         } while (track >= fentry);
 
 359         if ((track > 100) || (track < get_entry_track(gd.toc->first))) {
 
 360                 printk(KERN_INFO "GDROM: No data on the last "
 
 361                         "session of the CD\n");
 
 362                 gdrom_getsense(NULL);
 
 366         ms_info->addr_format = CDROM_LBA;
 
 367         ms_info->addr.lba = get_entry_lba(data);
 
 368         ms_info->xa_flag = 1;
 
 372 static int gdrom_open(struct cdrom_device_info *cd_info, int purpose)
 
 374         /* spin up the disk */
 
 375         return gdrom_preparedisk_cmd();
 
 378 /* this function is required even if empty */
 
 379 static void gdrom_release(struct cdrom_device_info *cd_info)
 
 383 static int gdrom_drivestatus(struct cdrom_device_info *cd_info, int ignore)
 
 385         /* read the sense key */
 
 386         char sense = ctrl_inb(GDROM_ERROR_REG);
 
 391                 return CDS_DRIVE_NOT_READY;
 
 396 static int gdrom_mediachanged(struct cdrom_device_info *cd_info, int ignore)
 
 398         /* check the sense key */
 
 399         return (ctrl_inb(GDROM_ERROR_REG) & 0xF0) == 0x60;
 
 402 /* reset the G1 bus */
 
 403 static int gdrom_hardreset(struct cdrom_device_info *cd_info)
 
 406         ctrl_outl(0x1fffff, GDROM_RESET_REG);
 
 407         for (count = 0xa0000000; count < 0xa0200000; count += 4)
 
 412 /* keep the function looking like the universal
 
 413  * CD Rom specification  - returning int */
 
 414 static int gdrom_packetcommand(struct cdrom_device_info *cd_info,
 
 415         struct packet_command *command)
 
 417         gdrom_spicommand(&command->cmd, command->buflen);
 
 421 /* Get Sense SPI command
 
 422  * From Marcus Comstedt
 
 424  * cmd + 4 = length of returned buffer
 
 425  * Returns 5 16 bit words
 
 427 static int gdrom_getsense(short *bufstring)
 
 429         struct packet_command *sense_command;
 
 434         sense_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
 
 437         sense_command->cmd[0] = 0x13;
 
 438         sense_command->cmd[4] = 10;
 
 439         sense_command->buflen = 10;
 
 440         /* even if something is pending try to get
 
 441         * the sense key if possible */
 
 442         if (gd.pending && !gdrom_wait_clrbusy()) {
 
 444                 goto cleanup_sense_final;
 
 447         gdrom_packetcommand(gd.cd_info, sense_command);
 
 448         wait_event_interruptible_timeout(command_queue, gd.pending == 0,
 
 449                 GDROM_DEFAULT_TIMEOUT);
 
 452         insw(PHYSADDR(GDROM_DATA_REG), &sense, sense_command->buflen/2);
 
 454                 printk(KERN_INFO "GDROM: Drive not ready - command aborted\n");
 
 457         sense_key = sense[1] & 0x0F;
 
 458         if (sense_key < ARRAY_SIZE(sense_texts))
 
 459                 printk(KERN_INFO "GDROM: %s\n", sense_texts[sense_key].text);
 
 461                 printk(KERN_ERR "GDROM: Unknown sense key: %d\n", sense_key);
 
 462         if (bufstring) /* return addional sense data */
 
 463                 memcpy(bufstring, &sense[4], 2);
 
 470         kfree(sense_command);
 
 474 static struct cdrom_device_ops gdrom_ops = {
 
 476         .release                = gdrom_release,
 
 477         .drive_status           = gdrom_drivestatus,
 
 478         .media_changed          = gdrom_mediachanged,
 
 479         .get_last_session       = gdrom_get_last_session,
 
 480         .reset                  = gdrom_hardreset,
 
 481         .capability             = CDC_MULTI_SESSION | CDC_MEDIA_CHANGED |
 
 482                                   CDC_RESET | CDC_DRIVE_STATUS | CDC_CD_R,
 
 486 static int gdrom_bdops_open(struct inode *inode, struct file *file)
 
 488         return cdrom_open(gd.cd_info, inode, file);
 
 491 static int gdrom_bdops_release(struct inode *inode, struct file *file)
 
 493         return cdrom_release(gd.cd_info, file);
 
 496 static int gdrom_bdops_mediachanged(struct gendisk *disk)
 
 498         return cdrom_media_changed(gd.cd_info);
 
 501 static int gdrom_bdops_ioctl(struct inode *inode, struct file *file,
 
 502         unsigned cmd, unsigned long arg)
 
 504         return cdrom_ioctl(file, gd.cd_info, inode, cmd, arg);
 
 507 static struct block_device_operations gdrom_bdops = {
 
 508         .owner                  = THIS_MODULE,
 
 509         .open                   = gdrom_bdops_open,
 
 510         .release                = gdrom_bdops_release,
 
 511         .media_changed          = gdrom_bdops_mediachanged,
 
 512         .ioctl                  = gdrom_bdops_ioctl,
 
 515 static irqreturn_t gdrom_command_interrupt(int irq, void *dev_id)
 
 517         gd.status = ctrl_inb(GDROM_STATUSCOMMAND_REG);
 
 521         wake_up_interruptible(&command_queue);
 
 525 static irqreturn_t gdrom_dma_interrupt(int irq, void *dev_id)
 
 527         gd.status = ctrl_inb(GDROM_STATUSCOMMAND_REG);
 
 528         if (gd.transfer != 1)
 
 531         wake_up_interruptible(&request_queue);
 
 535 static int __devinit gdrom_set_interrupt_handlers(void)
 
 539         err = request_irq(HW_EVENT_GDROM_CMD, gdrom_command_interrupt,
 
 540                 IRQF_DISABLED, "gdrom_command", &gd);
 
 543         err = request_irq(HW_EVENT_GDROM_DMA, gdrom_dma_interrupt,
 
 544                 IRQF_DISABLED, "gdrom_dma", &gd);
 
 546                 free_irq(HW_EVENT_GDROM_CMD, &gd);
 
 550 /* Implement DMA read using SPI command
 
 560 static void gdrom_readdisk_dma(struct work_struct *work)
 
 562         int err, block, block_cnt;
 
 563         struct packet_command *read_command;
 
 564         struct list_head *elem, *next;
 
 566         unsigned long timeout;
 
 568         if (list_empty(&gdrom_deferred))
 
 570         read_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
 
 572                 return; /* get more memory later? */
 
 573         read_command->cmd[0] = 0x30;
 
 574         read_command->cmd[1] = 0x20;
 
 575         spin_lock(&gdrom_lock);
 
 576         list_for_each_safe(elem, next, &gdrom_deferred) {
 
 577                 req = list_entry(elem, struct request, queuelist);
 
 578                 spin_unlock(&gdrom_lock);
 
 579                 block = req->sector/GD_TO_BLK + GD_SESSION_OFFSET;
 
 580                 block_cnt = req->nr_sectors/GD_TO_BLK;
 
 581                 ctrl_outl(PHYSADDR(req->buffer), GDROM_DMA_STARTADDR_REG);
 
 582                 ctrl_outl(block_cnt * GDROM_HARD_SECTOR, GDROM_DMA_LENGTH_REG);
 
 583                 ctrl_outl(1, GDROM_DMA_DIRECTION_REG);
 
 584                 ctrl_outl(1, GDROM_DMA_ENABLE_REG);
 
 585                 read_command->cmd[2] = (block >> 16) & 0xFF;
 
 586                 read_command->cmd[3] = (block >> 8) & 0xFF;
 
 587                 read_command->cmd[4] = block & 0xFF;
 
 588                 read_command->cmd[8] = (block_cnt >> 16) & 0xFF;
 
 589                 read_command->cmd[9] = (block_cnt >> 8) & 0xFF;
 
 590                 read_command->cmd[10] = block_cnt & 0xFF;
 
 592                 ctrl_outb(1, GDROM_ERROR_REG);
 
 593                 /* other registers */
 
 594                 ctrl_outb(0, GDROM_SECNUM_REG);
 
 595                 ctrl_outb(0, GDROM_BCL_REG);
 
 596                 ctrl_outb(0, GDROM_BCH_REG);
 
 597                 ctrl_outb(0, GDROM_DSEL_REG);
 
 598                 ctrl_outb(0, GDROM_INTSEC_REG);
 
 599                 /* Wait for registers to reset after any previous activity */
 
 600                 timeout = jiffies + HZ / 2;
 
 601                 while (gdrom_is_busy() && time_before(jiffies, timeout))
 
 603                 ctrl_outb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG);
 
 604                 timeout = jiffies + HZ / 2;
 
 605                 /* Wait for packet command to finish */
 
 606                 while (gdrom_is_busy() && time_before(jiffies, timeout))
 
 610                 outsw(PHYSADDR(GDROM_DATA_REG), &read_command->cmd, 6);
 
 611                 timeout = jiffies + HZ / 2;
 
 612                 /* Wait for any pending DMA to finish */
 
 613                 while (ctrl_inb(GDROM_DMA_STATUS_REG) &&
 
 614                         time_before(jiffies, timeout))
 
 617                 ctrl_outb(1, GDROM_DMA_STATUS_REG);
 
 618                 wait_event_interruptible_timeout(request_queue,
 
 619                         gd.transfer == 0, GDROM_DEFAULT_TIMEOUT);
 
 623                 /* now seek to take the request spinlock
 
 624                 * before handling ending the request */
 
 625                 spin_lock(&gdrom_lock);
 
 626                 list_del_init(&req->queuelist);
 
 627                 end_dequeued_request(req, 1 - err);
 
 629         spin_unlock(&gdrom_lock);
 
 633 static void gdrom_request_handler_dma(struct request *req)
 
 635         /* dequeue, add to list of deferred work
 
 636         * and then schedule workqueue */
 
 637         blkdev_dequeue_request(req);
 
 638         list_add_tail(&req->queuelist, &gdrom_deferred);
 
 639         schedule_work(&work);
 
 642 static void gdrom_request(struct request_queue *rq)
 
 646         while ((req = elv_next_request(rq)) != NULL) {
 
 647                 if (!blk_fs_request(req)) {
 
 648                         printk(KERN_DEBUG "GDROM: Non-fs request ignored\n");
 
 651                 if (rq_data_dir(req) != READ) {
 
 652                         printk(KERN_NOTICE "GDROM: Read only device -");
 
 653                         printk(" write request ignored\n");
 
 657                         gdrom_request_handler_dma(req);
 
 663 /* Print string identifying GD ROM device */
 
 664 static int __devinit gdrom_outputversion(void)
 
 667         char *model_name, *manuf_name, *firmw_ver;
 
 670         /* query device ID */
 
 671         id = kzalloc(sizeof(struct gdrom_id), GFP_KERNEL);
 
 674         gdrom_identifydevice(id);
 
 675         model_name = kstrndup(id->modname, 16, GFP_KERNEL);
 
 678         manuf_name = kstrndup(id->mname, 16, GFP_KERNEL);
 
 680                 goto free_model_name;
 
 681         firmw_ver = kstrndup(id->firmver, 16, GFP_KERNEL);
 
 683                 goto free_manuf_name;
 
 684         printk(KERN_INFO "GDROM: %s from %s with firmware %s\n",
 
 685                 model_name, manuf_name, firmw_ver);
 
 697 /* set the default mode for DMA transfer */
 
 698 static int __devinit gdrom_init_dma_mode(void)
 
 700         ctrl_outb(0x13, GDROM_ERROR_REG);
 
 701         ctrl_outb(0x22, GDROM_INTSEC_REG);
 
 702         if (!gdrom_wait_clrbusy())
 
 704         ctrl_outb(0xEF, GDROM_STATUSCOMMAND_REG);
 
 705         if (!gdrom_wait_busy_sleeps())
 
 707         /* Memory protection setting for GDROM DMA
 
 708         * Bits 31 - 16 security: 0x8843
 
 709         * Bits 15 and 7 reserved (0)
 
 710         * Bits 14 - 8 start of transfer range in 1 MB blocks OR'ed with 0x80
 
 711         * Bits 6 - 0 end of transfer range in 1 MB blocks OR'ed with 0x80
 
 712         * (0x40 | 0x80) = start range at 0x0C000000
 
 713         * (0x7F | 0x80) = end range at 0x0FFFFFFF */
 
 714         ctrl_outl(0x8843407F, GDROM_DMA_ACCESS_CTRL_REG);
 
 715         ctrl_outl(9, GDROM_DMA_WAIT_REG); /* DMA word setting */
 
 719 static void __devinit probe_gdrom_setupcd(void)
 
 721         gd.cd_info->ops = &gdrom_ops;
 
 722         gd.cd_info->capacity = 1;
 
 723         strcpy(gd.cd_info->name, GDROM_DEV_NAME);
 
 724         gd.cd_info->mask = CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|
 
 728 static void __devinit probe_gdrom_setupdisk(void)
 
 730         gd.disk->major = gdrom_major;
 
 731         gd.disk->first_minor = 1;
 
 733         strcpy(gd.disk->disk_name, GDROM_DEV_NAME);
 
 736 static int __devinit probe_gdrom_setupqueue(void)
 
 738         blk_queue_hardsect_size(gd.gdrom_rq, GDROM_HARD_SECTOR);
 
 739         /* using DMA so memory will need to be contiguous */
 
 740         blk_queue_max_hw_segments(gd.gdrom_rq, 1);
 
 741         /* set a large max size to get most from DMA */
 
 742         blk_queue_max_segment_size(gd.gdrom_rq, 0x40000);
 
 743         gd.disk->queue = gd.gdrom_rq;
 
 744         return gdrom_init_dma_mode();
 
 748  * register this as a block device and as compliant with the
 
 749  * universal CD Rom driver interface
 
 751 static int __devinit probe_gdrom(struct platform_device *devptr)
 
 754         /* Start the device */
 
 755         if (gdrom_execute_diagnostic() != 1) {
 
 756                 printk(KERN_WARNING "GDROM: ATA Probe for GDROM failed.\n");
 
 759         /* Print out firmware ID */
 
 760         if (gdrom_outputversion())
 
 763         gdrom_major = register_blkdev(0, GDROM_DEV_NAME);
 
 764         if (gdrom_major <= 0)
 
 766         printk(KERN_INFO "GDROM: Registered with major number %d\n",
 
 768         /* Specify basic properties of drive */
 
 769         gd.cd_info = kzalloc(sizeof(struct cdrom_device_info), GFP_KERNEL);
 
 772                 goto probe_fail_no_mem;
 
 774         probe_gdrom_setupcd();
 
 775         gd.disk = alloc_disk(1);
 
 778                 goto probe_fail_no_disk;
 
 780         probe_gdrom_setupdisk();
 
 781         if (register_cdrom(gd.cd_info)) {
 
 783                 goto probe_fail_cdrom_register;
 
 785         gd.disk->fops = &gdrom_bdops;
 
 786         /* latch on to the interrupt */
 
 787         err = gdrom_set_interrupt_handlers();
 
 789                 goto probe_fail_cmdirq_register;
 
 790         gd.gdrom_rq = blk_init_queue(gdrom_request, &gdrom_lock);
 
 792                 goto probe_fail_requestq;
 
 794         err = probe_gdrom_setupqueue();
 
 798         gd.toc = kzalloc(sizeof(struct gdromtoc), GFP_KERNEL);
 
 805         blk_cleanup_queue(gd.gdrom_rq);
 
 807         free_irq(HW_EVENT_GDROM_DMA, &gd);
 
 808         free_irq(HW_EVENT_GDROM_CMD, &gd);
 
 809 probe_fail_cmdirq_register:
 
 810 probe_fail_cdrom_register:
 
 811         del_gendisk(gd.disk);
 
 814         unregister_blkdev(gdrom_major, GDROM_DEV_NAME);
 
 817         printk(KERN_WARNING "GDROM: Probe failed - error is 0x%X\n", err);
 
 821 static int __devexit remove_gdrom(struct platform_device *devptr)
 
 823         flush_scheduled_work();
 
 824         blk_cleanup_queue(gd.gdrom_rq);
 
 825         free_irq(HW_EVENT_GDROM_CMD, &gd);
 
 826         free_irq(HW_EVENT_GDROM_DMA, &gd);
 
 827         del_gendisk(gd.disk);
 
 829                 unregister_blkdev(gdrom_major, GDROM_DEV_NAME);
 
 830         return unregister_cdrom(gd.cd_info);
 
 833 static struct platform_driver gdrom_driver = {
 
 834         .probe = probe_gdrom,
 
 835         .remove = __devexit_p(remove_gdrom),
 
 837                         .name = GDROM_DEV_NAME,
 
 841 static int __init init_gdrom(void)
 
 845         rc = platform_driver_register(&gdrom_driver);
 
 848         pd = platform_device_register_simple(GDROM_DEV_NAME, -1, NULL, 0);
 
 850                 platform_driver_unregister(&gdrom_driver);
 
 856 static void __exit exit_gdrom(void)
 
 858         platform_device_unregister(pd);
 
 859         platform_driver_unregister(&gdrom_driver);
 
 863 module_init(init_gdrom);
 
 864 module_exit(exit_gdrom);
 
 865 MODULE_AUTHOR("Adrian McMenamin <adrian@mcmen.demon.co.uk>");
 
 866 MODULE_DESCRIPTION("SEGA Dreamcast GD-ROM Driver");
 
 867 MODULE_LICENSE("GPL");