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1// SPDX-License-Identifier: GPL-2.0-or-later2/* GD ROM driver for the SEGA Dreamcast3 * copyright Adrian McMenamin, 20074 * With thanks to Marcus Comstedt and Nathan Keynes5 * for work in reversing PIO and DMA6 */7 8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt9 10#include <linux/init.h>11#include <linux/module.h>12#include <linux/fs.h>13#include <linux/kernel.h>14#include <linux/list.h>15#include <linux/slab.h>16#include <linux/dma-mapping.h>17#include <linux/cdrom.h>18#include <linux/bio.h>19#include <linux/blk-mq.h>20#include <linux/interrupt.h>21#include <linux/device.h>22#include <linux/mutex.h>23#include <linux/wait.h>24#include <linux/platform_device.h>25#include <scsi/scsi.h>26#include <asm/io.h>27#include <asm/dma.h>28#include <asm/delay.h>29#include <mach/dma.h>30#include <mach/sysasic.h>31 32#define GDROM_DEV_NAME "gdrom"33#define GD_SESSION_OFFSET 15034 35/* GD Rom commands */36#define GDROM_COM_SOFTRESET 0x0837#define GDROM_COM_EXECDIAG 0x9038#define GDROM_COM_PACKET 0xA039#define GDROM_COM_IDDEV 0xA140 41/* GD Rom registers */42#define GDROM_BASE_REG 0xA05F700043#define GDROM_ALTSTATUS_REG (GDROM_BASE_REG + 0x18)44#define GDROM_DATA_REG (GDROM_BASE_REG + 0x80)45#define GDROM_ERROR_REG (GDROM_BASE_REG + 0x84)46#define GDROM_INTSEC_REG (GDROM_BASE_REG + 0x88)47#define GDROM_SECNUM_REG (GDROM_BASE_REG + 0x8C)48#define GDROM_BCL_REG (GDROM_BASE_REG + 0x90)49#define GDROM_BCH_REG (GDROM_BASE_REG + 0x94)50#define GDROM_DSEL_REG (GDROM_BASE_REG + 0x98)51#define GDROM_STATUSCOMMAND_REG (GDROM_BASE_REG + 0x9C)52#define GDROM_RESET_REG (GDROM_BASE_REG + 0x4E4)53 54#define GDROM_DMA_STARTADDR_REG (GDROM_BASE_REG + 0x404)55#define GDROM_DMA_LENGTH_REG (GDROM_BASE_REG + 0x408)56#define GDROM_DMA_DIRECTION_REG (GDROM_BASE_REG + 0x40C)57#define GDROM_DMA_ENABLE_REG (GDROM_BASE_REG + 0x414)58#define GDROM_DMA_STATUS_REG (GDROM_BASE_REG + 0x418)59#define GDROM_DMA_WAIT_REG (GDROM_BASE_REG + 0x4A0)60#define GDROM_DMA_ACCESS_CTRL_REG (GDROM_BASE_REG + 0x4B8)61 62#define GDROM_HARD_SECTOR 204863#define BLOCK_LAYER_SECTOR 51264#define GD_TO_BLK 465 66#define GDROM_DEFAULT_TIMEOUT (HZ * 7)67 68static DEFINE_MUTEX(gdrom_mutex);69static const struct {70 int sense_key;71 const char * const text;72} sense_texts[] = {73 {NO_SENSE, "OK"},74 {RECOVERED_ERROR, "Recovered from error"},75 {NOT_READY, "Device not ready"},76 {MEDIUM_ERROR, "Disk not ready"},77 {HARDWARE_ERROR, "Hardware error"},78 {ILLEGAL_REQUEST, "Command has failed"},79 {UNIT_ATTENTION, "Device needs attention - disk may have been changed"},80 {DATA_PROTECT, "Data protection error"},81 {ABORTED_COMMAND, "Command aborted"},82};83 84static struct platform_device *pd;85static int gdrom_major;86static DECLARE_WAIT_QUEUE_HEAD(command_queue);87static DECLARE_WAIT_QUEUE_HEAD(request_queue);88 89struct gdromtoc {90 unsigned int entry[99];91 unsigned int first, last;92 unsigned int leadout;93};94 95static struct gdrom_unit {96 struct gendisk *disk;97 struct cdrom_device_info *cd_info;98 int status;99 int pending;100 int transfer;101 char disk_type;102 struct gdromtoc *toc;103 struct request_queue *gdrom_rq;104 struct blk_mq_tag_set tag_set;105} gd;106 107struct gdrom_id {108 char mid;109 char modid;110 char verid;111 char padA[13];112 char mname[16];113 char modname[16];114 char firmver[16];115 char padB[16];116};117 118static int gdrom_getsense(short *bufstring);119static int gdrom_packetcommand(struct cdrom_device_info *cd_info,120 struct packet_command *command);121static int gdrom_hardreset(struct cdrom_device_info *cd_info);122 123static bool gdrom_is_busy(void)124{125 return (__raw_readb(GDROM_ALTSTATUS_REG) & 0x80) != 0;126}127 128static bool gdrom_data_request(void)129{130 return (__raw_readb(GDROM_ALTSTATUS_REG) & 0x88) == 8;131}132 133static bool gdrom_wait_clrbusy(void)134{135 unsigned long timeout = jiffies + GDROM_DEFAULT_TIMEOUT;136 while ((__raw_readb(GDROM_ALTSTATUS_REG) & 0x80) &&137 (time_before(jiffies, timeout)))138 cpu_relax();139 return time_before(jiffies, timeout + 1);140}141 142static bool gdrom_wait_busy_sleeps(void)143{144 unsigned long timeout;145 /* Wait to get busy first */146 timeout = jiffies + GDROM_DEFAULT_TIMEOUT;147 while (!gdrom_is_busy() && time_before(jiffies, timeout))148 cpu_relax();149 /* Now wait for busy to clear */150 return gdrom_wait_clrbusy();151}152 153static void gdrom_identifydevice(void *buf)154{155 int c;156 short *data = buf;157 /* If the device won't clear it has probably158 * been hit by a serious failure - but we'll159 * try to return a sense key even so */160 if (!gdrom_wait_clrbusy()) {161 gdrom_getsense(NULL);162 return;163 }164 __raw_writeb(GDROM_COM_IDDEV, GDROM_STATUSCOMMAND_REG);165 if (!gdrom_wait_busy_sleeps()) {166 gdrom_getsense(NULL);167 return;168 }169 /* now read in the data */170 for (c = 0; c < 40; c++)171 data[c] = __raw_readw(GDROM_DATA_REG);172}173 174static void gdrom_spicommand(void *spi_string, int buflen)175{176 short *cmd = spi_string;177 unsigned long timeout;178 179 /* ensure IRQ_WAIT is set */180 __raw_writeb(0x08, GDROM_ALTSTATUS_REG);181 /* specify how many bytes we expect back */182 __raw_writeb(buflen & 0xFF, GDROM_BCL_REG);183 __raw_writeb((buflen >> 8) & 0xFF, GDROM_BCH_REG);184 /* other parameters */185 __raw_writeb(0, GDROM_INTSEC_REG);186 __raw_writeb(0, GDROM_SECNUM_REG);187 __raw_writeb(0, GDROM_ERROR_REG);188 /* Wait until we can go */189 if (!gdrom_wait_clrbusy()) {190 gdrom_getsense(NULL);191 return;192 }193 timeout = jiffies + GDROM_DEFAULT_TIMEOUT;194 __raw_writeb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG);195 while (!gdrom_data_request() && time_before(jiffies, timeout))196 cpu_relax();197 if (!time_before(jiffies, timeout + 1)) {198 gdrom_getsense(NULL);199 return;200 }201 outsw(GDROM_DATA_REG, cmd, 6);202}203 204 205/* gdrom_command_executediagnostic:206 * Used to probe for presence of working GDROM207 * Restarts GDROM device and then applies standard ATA 3208 * Execute Diagnostic Command: a return of '1' indicates device 0209 * present and device 1 absent210 */211static char gdrom_execute_diagnostic(void)212{213 gdrom_hardreset(gd.cd_info);214 if (!gdrom_wait_clrbusy())215 return 0;216 __raw_writeb(GDROM_COM_EXECDIAG, GDROM_STATUSCOMMAND_REG);217 if (!gdrom_wait_busy_sleeps())218 return 0;219 return __raw_readb(GDROM_ERROR_REG);220}221 222/*223 * Prepare disk command224 * byte 0 = 0x70225 * byte 1 = 0x1f226 */227static int gdrom_preparedisk_cmd(void)228{229 struct packet_command *spin_command;230 spin_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);231 if (!spin_command)232 return -ENOMEM;233 spin_command->cmd[0] = 0x70;234 spin_command->cmd[2] = 0x1f;235 spin_command->buflen = 0;236 gd.pending = 1;237 gdrom_packetcommand(gd.cd_info, spin_command);238 /* 60 second timeout */239 wait_event_interruptible_timeout(command_queue, gd.pending == 0,240 GDROM_DEFAULT_TIMEOUT);241 gd.pending = 0;242 kfree(spin_command);243 if (gd.status & 0x01) {244 /* log an error */245 gdrom_getsense(NULL);246 return -EIO;247 }248 return 0;249}250 251/*252 * Read TOC command253 * byte 0 = 0x14254 * byte 1 = session255 * byte 3 = sizeof TOC >> 8 ie upper byte256 * byte 4 = sizeof TOC & 0xff ie lower byte257 */258static int gdrom_readtoc_cmd(struct gdromtoc *toc, int session)259{260 int tocsize;261 struct packet_command *toc_command;262 int err = 0;263 264 toc_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);265 if (!toc_command)266 return -ENOMEM;267 tocsize = sizeof(struct gdromtoc);268 toc_command->cmd[0] = 0x14;269 toc_command->cmd[1] = session;270 toc_command->cmd[3] = tocsize >> 8;271 toc_command->cmd[4] = tocsize & 0xff;272 toc_command->buflen = tocsize;273 if (gd.pending) {274 err = -EBUSY;275 goto cleanup_readtoc_final;276 }277 gd.pending = 1;278 gdrom_packetcommand(gd.cd_info, toc_command);279 wait_event_interruptible_timeout(command_queue, gd.pending == 0,280 GDROM_DEFAULT_TIMEOUT);281 if (gd.pending) {282 err = -EINVAL;283 goto cleanup_readtoc;284 }285 insw(GDROM_DATA_REG, toc, tocsize/2);286 if (gd.status & 0x01)287 err = -EINVAL;288 289cleanup_readtoc:290 gd.pending = 0;291cleanup_readtoc_final:292 kfree(toc_command);293 return err;294}295 296/* TOC helpers */297static int get_entry_lba(int track)298{299 return (cpu_to_be32(track & 0xffffff00) - GD_SESSION_OFFSET);300}301 302static int get_entry_q_ctrl(int track)303{304 return (track & 0x000000f0) >> 4;305}306 307static int get_entry_track(int track)308{309 return (track & 0x0000ff00) >> 8;310}311 312static int gdrom_get_last_session(struct cdrom_device_info *cd_info,313 struct cdrom_multisession *ms_info)314{315 int fentry, lentry, track, data, err;316 317 if (!gd.toc)318 return -ENOMEM;319 320 /* Check if GD-ROM */321 err = gdrom_readtoc_cmd(gd.toc, 1);322 /* Not a GD-ROM so check if standard CD-ROM */323 if (err) {324 err = gdrom_readtoc_cmd(gd.toc, 0);325 if (err) {326 pr_info("Could not get CD table of contents\n");327 return -ENXIO;328 }329 }330 331 fentry = get_entry_track(gd.toc->first);332 lentry = get_entry_track(gd.toc->last);333 /* Find the first data track */334 track = get_entry_track(gd.toc->last);335 do {336 data = gd.toc->entry[track - 1];337 if (get_entry_q_ctrl(data))338 break; /* ie a real data track */339 track--;340 } while (track >= fentry);341 342 if ((track > 100) || (track < get_entry_track(gd.toc->first))) {343 pr_info("No data on the last session of the CD\n");344 gdrom_getsense(NULL);345 return -ENXIO;346 }347 348 ms_info->addr_format = CDROM_LBA;349 ms_info->addr.lba = get_entry_lba(data);350 ms_info->xa_flag = 1;351 return 0;352}353 354static int gdrom_open(struct cdrom_device_info *cd_info, int purpose)355{356 /* spin up the disk */357 return gdrom_preparedisk_cmd();358}359 360/* this function is required even if empty */361static void gdrom_release(struct cdrom_device_info *cd_info)362{363}364 365static int gdrom_drivestatus(struct cdrom_device_info *cd_info, int ignore)366{367 /* read the sense key */368 char sense = __raw_readb(GDROM_ERROR_REG);369 sense &= 0xF0;370 if (sense == 0)371 return CDS_DISC_OK;372 if (sense == 0x20)373 return CDS_DRIVE_NOT_READY;374 /* default */375 return CDS_NO_INFO;376}377 378static unsigned int gdrom_check_events(struct cdrom_device_info *cd_info,379 unsigned int clearing, int ignore)380{381 /* check the sense key */382 return (__raw_readb(GDROM_ERROR_REG) & 0xF0) == 0x60 ?383 DISK_EVENT_MEDIA_CHANGE : 0;384}385 386/* reset the G1 bus */387static int gdrom_hardreset(struct cdrom_device_info *cd_info)388{389 int count;390 __raw_writel(0x1fffff, GDROM_RESET_REG);391 for (count = 0xa0000000; count < 0xa0200000; count += 4)392 __raw_readl(count);393 return 0;394}395 396/* keep the function looking like the universal397 * CD Rom specification - returning int */398static int gdrom_packetcommand(struct cdrom_device_info *cd_info,399 struct packet_command *command)400{401 gdrom_spicommand(&command->cmd, command->buflen);402 return 0;403}404 405/* Get Sense SPI command406 * From Marcus Comstedt407 * cmd = 0x13408 * cmd + 4 = length of returned buffer409 * Returns 5 16 bit words410 */411static int gdrom_getsense(short *bufstring)412{413 struct packet_command *sense_command;414 short sense[5];415 int sense_key;416 int err = -EIO;417 418 sense_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);419 if (!sense_command)420 return -ENOMEM;421 sense_command->cmd[0] = 0x13;422 sense_command->cmd[4] = 10;423 sense_command->buflen = 10;424 /* even if something is pending try to get425 * the sense key if possible */426 if (gd.pending && !gdrom_wait_clrbusy()) {427 err = -EBUSY;428 goto cleanup_sense_final;429 }430 gd.pending = 1;431 gdrom_packetcommand(gd.cd_info, sense_command);432 wait_event_interruptible_timeout(command_queue, gd.pending == 0,433 GDROM_DEFAULT_TIMEOUT);434 if (gd.pending)435 goto cleanup_sense;436 insw(GDROM_DATA_REG, &sense, sense_command->buflen/2);437 if (sense[1] & 40) {438 pr_info("Drive not ready - command aborted\n");439 goto cleanup_sense;440 }441 sense_key = sense[1] & 0x0F;442 if (sense_key < ARRAY_SIZE(sense_texts))443 pr_info("%s\n", sense_texts[sense_key].text);444 else445 pr_err("Unknown sense key: %d\n", sense_key);446 if (bufstring) /* return addional sense data */447 memcpy(bufstring, &sense[4], 2);448 if (sense_key < 2)449 err = 0;450 451cleanup_sense:452 gd.pending = 0;453cleanup_sense_final:454 kfree(sense_command);455 return err;456}457 458static int gdrom_audio_ioctl(struct cdrom_device_info *cdi, unsigned int cmd,459 void *arg)460{461 return -EINVAL;462}463 464static const struct cdrom_device_ops gdrom_ops = {465 .open = gdrom_open,466 .release = gdrom_release,467 .drive_status = gdrom_drivestatus,468 .check_events = gdrom_check_events,469 .get_last_session = gdrom_get_last_session,470 .reset = gdrom_hardreset,471 .audio_ioctl = gdrom_audio_ioctl,472 .generic_packet = cdrom_dummy_generic_packet,473 .capability = CDC_MULTI_SESSION | CDC_MEDIA_CHANGED |474 CDC_RESET | CDC_DRIVE_STATUS | CDC_CD_R,475};476 477static int gdrom_bdops_open(struct gendisk *disk, blk_mode_t mode)478{479 int ret;480 481 disk_check_media_change(disk);482 483 mutex_lock(&gdrom_mutex);484 ret = cdrom_open(gd.cd_info, mode);485 mutex_unlock(&gdrom_mutex);486 return ret;487}488 489static void gdrom_bdops_release(struct gendisk *disk)490{491 mutex_lock(&gdrom_mutex);492 cdrom_release(gd.cd_info);493 mutex_unlock(&gdrom_mutex);494}495 496static unsigned int gdrom_bdops_check_events(struct gendisk *disk,497 unsigned int clearing)498{499 return cdrom_check_events(gd.cd_info, clearing);500}501 502static int gdrom_bdops_ioctl(struct block_device *bdev, blk_mode_t mode,503 unsigned cmd, unsigned long arg)504{505 int ret;506 507 mutex_lock(&gdrom_mutex);508 ret = cdrom_ioctl(gd.cd_info, bdev, cmd, arg);509 mutex_unlock(&gdrom_mutex);510 511 return ret;512}513 514static const struct block_device_operations gdrom_bdops = {515 .owner = THIS_MODULE,516 .open = gdrom_bdops_open,517 .release = gdrom_bdops_release,518 .check_events = gdrom_bdops_check_events,519 .ioctl = gdrom_bdops_ioctl,520#ifdef CONFIG_COMPAT521 .compat_ioctl = blkdev_compat_ptr_ioctl,522#endif523};524 525static irqreturn_t gdrom_command_interrupt(int irq, void *dev_id)526{527 gd.status = __raw_readb(GDROM_STATUSCOMMAND_REG);528 if (gd.pending != 1)529 return IRQ_HANDLED;530 gd.pending = 0;531 wake_up_interruptible(&command_queue);532 return IRQ_HANDLED;533}534 535static irqreturn_t gdrom_dma_interrupt(int irq, void *dev_id)536{537 gd.status = __raw_readb(GDROM_STATUSCOMMAND_REG);538 if (gd.transfer != 1)539 return IRQ_HANDLED;540 gd.transfer = 0;541 wake_up_interruptible(&request_queue);542 return IRQ_HANDLED;543}544 545static int gdrom_set_interrupt_handlers(void)546{547 int err;548 549 err = request_irq(HW_EVENT_GDROM_CMD, gdrom_command_interrupt,550 0, "gdrom_command", &gd);551 if (err)552 return err;553 err = request_irq(HW_EVENT_GDROM_DMA, gdrom_dma_interrupt,554 0, "gdrom_dma", &gd);555 if (err)556 free_irq(HW_EVENT_GDROM_CMD, &gd);557 return err;558}559 560/* Implement DMA read using SPI command561 * 0 -> 0x30562 * 1 -> mode563 * 2 -> block >> 16564 * 3 -> block >> 8565 * 4 -> block566 * 8 -> sectors >> 16567 * 9 -> sectors >> 8568 * 10 -> sectors569 */570static blk_status_t gdrom_readdisk_dma(struct request *req)571{572 int block, block_cnt;573 blk_status_t err;574 struct packet_command *read_command;575 unsigned long timeout;576 577 read_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);578 if (!read_command)579 return BLK_STS_RESOURCE;580 581 read_command->cmd[0] = 0x30;582 read_command->cmd[1] = 0x20;583 block = blk_rq_pos(req)/GD_TO_BLK + GD_SESSION_OFFSET;584 block_cnt = blk_rq_sectors(req)/GD_TO_BLK;585 __raw_writel(page_to_phys(bio_page(req->bio)) + bio_offset(req->bio),586 GDROM_DMA_STARTADDR_REG);587 __raw_writel(block_cnt * GDROM_HARD_SECTOR, GDROM_DMA_LENGTH_REG);588 __raw_writel(1, GDROM_DMA_DIRECTION_REG);589 __raw_writel(1, GDROM_DMA_ENABLE_REG);590 read_command->cmd[2] = (block >> 16) & 0xFF;591 read_command->cmd[3] = (block >> 8) & 0xFF;592 read_command->cmd[4] = block & 0xFF;593 read_command->cmd[8] = (block_cnt >> 16) & 0xFF;594 read_command->cmd[9] = (block_cnt >> 8) & 0xFF;595 read_command->cmd[10] = block_cnt & 0xFF;596 /* set for DMA */597 __raw_writeb(1, GDROM_ERROR_REG);598 /* other registers */599 __raw_writeb(0, GDROM_SECNUM_REG);600 __raw_writeb(0, GDROM_BCL_REG);601 __raw_writeb(0, GDROM_BCH_REG);602 __raw_writeb(0, GDROM_DSEL_REG);603 __raw_writeb(0, GDROM_INTSEC_REG);604 /* Wait for registers to reset after any previous activity */605 timeout = jiffies + HZ / 2;606 while (gdrom_is_busy() && time_before(jiffies, timeout))607 cpu_relax();608 __raw_writeb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG);609 timeout = jiffies + HZ / 2;610 /* Wait for packet command to finish */611 while (gdrom_is_busy() && time_before(jiffies, timeout))612 cpu_relax();613 gd.pending = 1;614 gd.transfer = 1;615 outsw(GDROM_DATA_REG, &read_command->cmd, 6);616 timeout = jiffies + HZ / 2;617 /* Wait for any pending DMA to finish */618 while (__raw_readb(GDROM_DMA_STATUS_REG) &&619 time_before(jiffies, timeout))620 cpu_relax();621 /* start transfer */622 __raw_writeb(1, GDROM_DMA_STATUS_REG);623 wait_event_interruptible_timeout(request_queue,624 gd.transfer == 0, GDROM_DEFAULT_TIMEOUT);625 err = gd.transfer ? BLK_STS_IOERR : BLK_STS_OK;626 gd.transfer = 0;627 gd.pending = 0;628 629 blk_mq_end_request(req, err);630 kfree(read_command);631 return BLK_STS_OK;632}633 634static 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 */652static 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);676free_manuf_name:677 kfree(manuf_name);678free_model_name:679 kfree(model_name);680free_id:681 kfree(id);682 return err;683}684 685/* set the default mode for DMA transfer */686static 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 DMA696 * Bits 31 - 16 security: 0x8843697 * Bits 15 and 7 reserved (0)698 * Bits 14 - 8 start of transfer range in 1 MB blocks OR'ed with 0x80699 * Bits 6 - 0 end of transfer range in 1 MB blocks OR'ed with 0x80700 * (0x40 | 0x80) = start range at 0x0C000000701 * (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 707static 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 716static void probe_gdrom_setupdisk(void)717{718 gd.disk->major = gdrom_major;719 gd.disk->first_minor = 1;720 gd.disk->minors = 1;721 gd.disk->flags |= GENHD_FL_NO_PART;722 strcpy(gd.disk->disk_name, GDROM_DEV_NAME);723}724 725static int probe_gdrom_setupqueue(void)726{727 gd.disk->queue = gd.gdrom_rq;728 return gdrom_init_dma_mode();729}730 731static const struct blk_mq_ops gdrom_mq_ops = {732 .queue_rq = gdrom_queue_rq,733};734 735/*736 * register this as a block device and as compliant with the737 * universal CD Rom driver interface738 */739static int probe_gdrom(struct platform_device *devptr)740{741 struct queue_limits lim = {742 .logical_block_size = GDROM_HARD_SECTOR,743 /* using DMA so memory will need to be contiguous */744 .max_segments = 1,745 /* set a large max size to get most from DMA */746 .max_segment_size = 0x40000,747 .features = BLK_FEAT_ROTATIONAL,748 };749 int err;750 751 /*752 * Ensure our "one" device is initialized properly in case of previous753 * usages of it754 */755 memset(&gd, 0, sizeof(gd));756 757 /* Start the device */758 if (gdrom_execute_diagnostic() != 1) {759 pr_warn("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();778 779 err = blk_mq_alloc_sq_tag_set(&gd.tag_set, &gdrom_mq_ops, 1,780 BLK_MQ_F_SHOULD_MERGE | BLK_MQ_F_BLOCKING);781 if (err)782 goto probe_fail_free_cd_info;783 784 gd.disk = blk_mq_alloc_disk(&gd.tag_set, &lim, NULL);785 if (IS_ERR(gd.disk)) {786 err = PTR_ERR(gd.disk);787 goto probe_fail_free_tag_set;788 }789 gd.gdrom_rq = gd.disk->queue;790 probe_gdrom_setupdisk();791 if (register_cdrom(gd.disk, gd.cd_info)) {792 err = -ENODEV;793 goto probe_fail_cleanup_disk;794 }795 gd.disk->fops = &gdrom_bdops;796 gd.disk->events = DISK_EVENT_MEDIA_CHANGE;797 /* latch on to the interrupt */798 err = gdrom_set_interrupt_handlers();799 if (err)800 goto probe_fail_cleanup_disk;801 802 err = probe_gdrom_setupqueue();803 if (err)804 goto probe_fail_free_irqs;805 806 gd.toc = kzalloc(sizeof(struct gdromtoc), GFP_KERNEL);807 if (!gd.toc) {808 err = -ENOMEM;809 goto probe_fail_free_irqs;810 }811 err = add_disk(gd.disk);812 if (err)813 goto probe_fail_add_disk;814 815 return 0;816 817probe_fail_add_disk:818 kfree(gd.toc);819probe_fail_free_irqs:820 free_irq(HW_EVENT_GDROM_DMA, &gd);821 free_irq(HW_EVENT_GDROM_CMD, &gd);822probe_fail_cleanup_disk:823 put_disk(gd.disk);824probe_fail_free_tag_set:825 blk_mq_free_tag_set(&gd.tag_set);826probe_fail_free_cd_info:827 kfree(gd.cd_info);828probe_fail_no_mem:829 unregister_blkdev(gdrom_major, GDROM_DEV_NAME);830 gdrom_major = 0;831 pr_warn("Probe failed - error is 0x%X\n", err);832 return err;833}834 835static void remove_gdrom(struct platform_device *devptr)836{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 kfree(gd.cd_info);845 kfree(gd.toc);846}847 848static struct platform_driver gdrom_driver = {849 .probe = probe_gdrom,850 .remove_new = remove_gdrom,851 .driver = {852 .name = GDROM_DEV_NAME,853 },854};855 856static int __init init_gdrom(void)857{858 int rc;859 860 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 871static void __exit exit_gdrom(void)872{873 platform_device_unregister(pd);874 platform_driver_unregister(&gdrom_driver);875}876 877module_init(init_gdrom);878module_exit(exit_gdrom);879MODULE_AUTHOR("Adrian McMenamin <adrian@mcmen.demon.co.uk>");880MODULE_DESCRIPTION("SEGA Dreamcast GD-ROM Driver");881MODULE_LICENSE("GPL");882