gdrom.c 22.5 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
/* GD ROM driver for the SEGA Dreamcast
 * copyright Adrian McMenamin, 2007
 * With thanks to Marcus Comstedt and Nathan Keynes
 * for work in reversing PIO and DMA
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 */

J
Joe Perches 已提交
22 23
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43
#include <linux/init.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/dma-mapping.h>
#include <linux/cdrom.h>
#include <linux/genhd.h>
#include <linux/bio.h>
#include <linux/blkdev.h>
#include <linux/interrupt.h>
#include <linux/device.h>
#include <linux/wait.h>
#include <linux/workqueue.h>
#include <linux/platform_device.h>
#include <scsi/scsi.h>
#include <asm/io.h>
#include <asm/dma.h>
#include <asm/delay.h>
44 45
#include <mach/dma.h>
#include <mach/sysasic.h>
46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218

#define GDROM_DEV_NAME "gdrom"
#define GD_SESSION_OFFSET 150

/* GD Rom commands */
#define GDROM_COM_SOFTRESET 0x08
#define GDROM_COM_EXECDIAG 0x90
#define GDROM_COM_PACKET 0xA0
#define GDROM_COM_IDDEV 0xA1

/* GD Rom registers */
#define GDROM_BASE_REG			0xA05F7000
#define GDROM_ALTSTATUS_REG		(GDROM_BASE_REG + 0x18)
#define GDROM_DATA_REG			(GDROM_BASE_REG + 0x80)
#define GDROM_ERROR_REG		(GDROM_BASE_REG + 0x84)
#define GDROM_INTSEC_REG		(GDROM_BASE_REG + 0x88)
#define GDROM_SECNUM_REG		(GDROM_BASE_REG + 0x8C)
#define GDROM_BCL_REG			(GDROM_BASE_REG + 0x90)
#define GDROM_BCH_REG			(GDROM_BASE_REG + 0x94)
#define GDROM_DSEL_REG			(GDROM_BASE_REG + 0x98)
#define GDROM_STATUSCOMMAND_REG	(GDROM_BASE_REG + 0x9C)
#define GDROM_RESET_REG		(GDROM_BASE_REG + 0x4E4)

#define GDROM_DMA_STARTADDR_REG	(GDROM_BASE_REG + 0x404)
#define GDROM_DMA_LENGTH_REG		(GDROM_BASE_REG + 0x408)
#define GDROM_DMA_DIRECTION_REG	(GDROM_BASE_REG + 0x40C)
#define GDROM_DMA_ENABLE_REG		(GDROM_BASE_REG + 0x414)
#define GDROM_DMA_STATUS_REG		(GDROM_BASE_REG + 0x418)
#define GDROM_DMA_WAIT_REG		(GDROM_BASE_REG + 0x4A0)
#define GDROM_DMA_ACCESS_CTRL_REG	(GDROM_BASE_REG + 0x4B8)

#define GDROM_HARD_SECTOR	2048
#define BLOCK_LAYER_SECTOR	512
#define GD_TO_BLK		4

#define GDROM_DEFAULT_TIMEOUT	(HZ * 7)

static const struct {
	int sense_key;
	const char * const text;
} sense_texts[] = {
	{NO_SENSE, "OK"},
	{RECOVERED_ERROR, "Recovered from error"},
	{NOT_READY, "Device not ready"},
	{MEDIUM_ERROR, "Disk not ready"},
	{HARDWARE_ERROR, "Hardware error"},
	{ILLEGAL_REQUEST, "Command has failed"},
	{UNIT_ATTENTION, "Device needs attention - disk may have been changed"},
	{DATA_PROTECT, "Data protection error"},
	{ABORTED_COMMAND, "Command aborted"},
};

static struct platform_device *pd;
static int gdrom_major;
static DECLARE_WAIT_QUEUE_HEAD(command_queue);
static DECLARE_WAIT_QUEUE_HEAD(request_queue);

static DEFINE_SPINLOCK(gdrom_lock);
static void gdrom_readdisk_dma(struct work_struct *work);
static DECLARE_WORK(work, gdrom_readdisk_dma);
static LIST_HEAD(gdrom_deferred);

struct gdromtoc {
	unsigned int entry[99];
	unsigned int first, last;
	unsigned int leadout;
};

static struct gdrom_unit {
	struct gendisk *disk;
	struct cdrom_device_info *cd_info;
	int status;
	int pending;
	int transfer;
	char disk_type;
	struct gdromtoc *toc;
	struct request_queue *gdrom_rq;
} gd;

struct gdrom_id {
	char mid;
	char modid;
	char verid;
	char padA[13];
	char mname[16];
	char modname[16];
	char firmver[16];
	char padB[16];
};

static int gdrom_getsense(short *bufstring);
static int gdrom_packetcommand(struct cdrom_device_info *cd_info,
	struct packet_command *command);
static int gdrom_hardreset(struct cdrom_device_info *cd_info);

static bool gdrom_is_busy(void)
{
	return (ctrl_inb(GDROM_ALTSTATUS_REG) & 0x80) != 0;
}

static bool gdrom_data_request(void)
{
	return (ctrl_inb(GDROM_ALTSTATUS_REG) & 0x88) == 8;
}

static bool gdrom_wait_clrbusy(void)
{
	unsigned long timeout = jiffies + GDROM_DEFAULT_TIMEOUT;
	while ((ctrl_inb(GDROM_ALTSTATUS_REG) & 0x80) &&
		(time_before(jiffies, timeout)))
		cpu_relax();
	return time_before(jiffies, timeout + 1);
}

static bool gdrom_wait_busy_sleeps(void)
{
	unsigned long timeout;
	/* Wait to get busy first */
	timeout = jiffies + GDROM_DEFAULT_TIMEOUT;
	while (!gdrom_is_busy() && time_before(jiffies, timeout))
		cpu_relax();
	/* Now wait for busy to clear */
	return gdrom_wait_clrbusy();
}

static void gdrom_identifydevice(void *buf)
{
	int c;
	short *data = buf;
	/* If the device won't clear it has probably
	* been hit by a serious failure - but we'll
	* try to return a sense key even so */
	if (!gdrom_wait_clrbusy()) {
		gdrom_getsense(NULL);
		return;
	}
	ctrl_outb(GDROM_COM_IDDEV, GDROM_STATUSCOMMAND_REG);
	if (!gdrom_wait_busy_sleeps()) {
		gdrom_getsense(NULL);
		return;
	}
	/* now read in the data */
	for (c = 0; c < 40; c++)
		data[c] = ctrl_inw(GDROM_DATA_REG);
}

static void gdrom_spicommand(void *spi_string, int buflen)
{
	short *cmd = spi_string;
	unsigned long timeout;

	/* ensure IRQ_WAIT is set */
	ctrl_outb(0x08, GDROM_ALTSTATUS_REG);
	/* specify how many bytes we expect back */
	ctrl_outb(buflen & 0xFF, GDROM_BCL_REG);
	ctrl_outb((buflen >> 8) & 0xFF, GDROM_BCH_REG);
	/* other parameters */
	ctrl_outb(0, GDROM_INTSEC_REG);
	ctrl_outb(0, GDROM_SECNUM_REG);
	ctrl_outb(0, GDROM_ERROR_REG);
	/* Wait until we can go */
	if (!gdrom_wait_clrbusy()) {
		gdrom_getsense(NULL);
		return;
	}
	timeout = jiffies + GDROM_DEFAULT_TIMEOUT;
	ctrl_outb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG);
	while (!gdrom_data_request() && time_before(jiffies, timeout))
		cpu_relax();
	if (!time_before(jiffies, timeout + 1)) {
		gdrom_getsense(NULL);
		return;
	}
P
Paul Mundt 已提交
219
	outsw(GDROM_DATA_REG, cmd, 6);
220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302
}


/* gdrom_command_executediagnostic:
 * Used to probe for presence of working GDROM
 * Restarts GDROM device and then applies standard ATA 3
 * Execute Diagnostic Command: a return of '1' indicates device 0
 * present and device 1 absent
 */
static char gdrom_execute_diagnostic(void)
{
	gdrom_hardreset(gd.cd_info);
	if (!gdrom_wait_clrbusy())
		return 0;
	ctrl_outb(GDROM_COM_EXECDIAG, GDROM_STATUSCOMMAND_REG);
	if (!gdrom_wait_busy_sleeps())
		return 0;
	return ctrl_inb(GDROM_ERROR_REG);
}

/*
 * Prepare disk command
 * byte 0 = 0x70
 * byte 1 = 0x1f
 */
static int gdrom_preparedisk_cmd(void)
{
	struct packet_command *spin_command;
	spin_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
	if (!spin_command)
		return -ENOMEM;
	spin_command->cmd[0] = 0x70;
	spin_command->cmd[2] = 0x1f;
	spin_command->buflen = 0;
	gd.pending = 1;
	gdrom_packetcommand(gd.cd_info, spin_command);
	/* 60 second timeout */
	wait_event_interruptible_timeout(command_queue, gd.pending == 0,
		GDROM_DEFAULT_TIMEOUT);
	gd.pending = 0;
	kfree(spin_command);
	if (gd.status & 0x01) {
		/* log an error */
		gdrom_getsense(NULL);
		return -EIO;
	}
	return 0;
}

/*
 * Read TOC command
 * byte 0 = 0x14
 * byte 1 = session
 * byte 3 = sizeof TOC >> 8  ie upper byte
 * byte 4 = sizeof TOC & 0xff ie lower byte
 */
static int gdrom_readtoc_cmd(struct gdromtoc *toc, int session)
{
	int tocsize;
	struct packet_command *toc_command;
	int err = 0;

	toc_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
	if (!toc_command)
		return -ENOMEM;
	tocsize = sizeof(struct gdromtoc);
	toc_command->cmd[0] = 0x14;
	toc_command->cmd[1] = session;
	toc_command->cmd[3] = tocsize >> 8;
	toc_command->cmd[4] = tocsize & 0xff;
	toc_command->buflen = tocsize;
	if (gd.pending) {
		err = -EBUSY;
		goto cleanup_readtoc_final;
	}
	gd.pending = 1;
	gdrom_packetcommand(gd.cd_info, toc_command);
	wait_event_interruptible_timeout(command_queue, gd.pending == 0,
		GDROM_DEFAULT_TIMEOUT);
	if (gd.pending) {
		err = -EINVAL;
		goto cleanup_readtoc;
	}
P
Paul Mundt 已提交
303
	insw(GDROM_DATA_REG, toc, tocsize/2);
304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343
	if (gd.status & 0x01)
		err = -EINVAL;

cleanup_readtoc:
	gd.pending = 0;
cleanup_readtoc_final:
	kfree(toc_command);
	return err;
}

/* TOC helpers */
static int get_entry_lba(int track)
{
	return (cpu_to_be32(track & 0xffffff00) - GD_SESSION_OFFSET);
}

static int get_entry_q_ctrl(int track)
{
	return (track & 0x000000f0) >> 4;
}

static int get_entry_track(int track)
{
	return (track & 0x0000ff00) >> 8;
}

static int gdrom_get_last_session(struct cdrom_device_info *cd_info,
	struct cdrom_multisession *ms_info)
{
	int fentry, lentry, track, data, tocuse, err;
	if (!gd.toc)
		return -ENOMEM;
	tocuse = 1;
	/* Check if GD-ROM */
	err = gdrom_readtoc_cmd(gd.toc, 1);
	/* Not a GD-ROM so check if standard CD-ROM */
	if (err) {
		tocuse = 0;
		err = gdrom_readtoc_cmd(gd.toc, 0);
		if (err) {
J
Joe Perches 已提交
344
			pr_info("Could not get CD table of contents\n");
345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360
			return -ENXIO;
		}
	}

	fentry = get_entry_track(gd.toc->first);
	lentry = get_entry_track(gd.toc->last);
	/* Find the first data track */
	track = get_entry_track(gd.toc->last);
	do {
		data = gd.toc->entry[track - 1];
		if (get_entry_q_ctrl(data))
			break;	/* ie a real data track */
		track--;
	} while (track >= fentry);

	if ((track > 100) || (track < get_entry_track(gd.toc->first))) {
J
Joe Perches 已提交
361
		pr_info("No data on the last session of the CD\n");
362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451
		gdrom_getsense(NULL);
		return -ENXIO;
	}

	ms_info->addr_format = CDROM_LBA;
	ms_info->addr.lba = get_entry_lba(data);
	ms_info->xa_flag = 1;
	return 0;
}

static int gdrom_open(struct cdrom_device_info *cd_info, int purpose)
{
	/* spin up the disk */
	return gdrom_preparedisk_cmd();
}

/* this function is required even if empty */
static void gdrom_release(struct cdrom_device_info *cd_info)
{
}

static int gdrom_drivestatus(struct cdrom_device_info *cd_info, int ignore)
{
	/* read the sense key */
	char sense = ctrl_inb(GDROM_ERROR_REG);
	sense &= 0xF0;
	if (sense == 0)
		return CDS_DISC_OK;
	if (sense == 0x20)
		return CDS_DRIVE_NOT_READY;
	/* default */
	return CDS_NO_INFO;
}

static int gdrom_mediachanged(struct cdrom_device_info *cd_info, int ignore)
{
	/* check the sense key */
	return (ctrl_inb(GDROM_ERROR_REG) & 0xF0) == 0x60;
}

/* reset the G1 bus */
static int gdrom_hardreset(struct cdrom_device_info *cd_info)
{
	int count;
	ctrl_outl(0x1fffff, GDROM_RESET_REG);
	for (count = 0xa0000000; count < 0xa0200000; count += 4)
		ctrl_inl(count);
	return 0;
}

/* keep the function looking like the universal
 * CD Rom specification  - returning int */
static int gdrom_packetcommand(struct cdrom_device_info *cd_info,
	struct packet_command *command)
{
	gdrom_spicommand(&command->cmd, command->buflen);
	return 0;
}

/* Get Sense SPI command
 * From Marcus Comstedt
 * cmd = 0x13
 * cmd + 4 = length of returned buffer
 * Returns 5 16 bit words
 */
static int gdrom_getsense(short *bufstring)
{
	struct packet_command *sense_command;
	short sense[5];
	int sense_key;
	int err = -EIO;

	sense_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
	if (!sense_command)
		return -ENOMEM;
	sense_command->cmd[0] = 0x13;
	sense_command->cmd[4] = 10;
	sense_command->buflen = 10;
	/* even if something is pending try to get
	* the sense key if possible */
	if (gd.pending && !gdrom_wait_clrbusy()) {
		err = -EBUSY;
		goto cleanup_sense_final;
	}
	gd.pending = 1;
	gdrom_packetcommand(gd.cd_info, sense_command);
	wait_event_interruptible_timeout(command_queue, gd.pending == 0,
		GDROM_DEFAULT_TIMEOUT);
	if (gd.pending)
		goto cleanup_sense;
P
Paul Mundt 已提交
452
	insw(GDROM_DATA_REG, &sense, sense_command->buflen/2);
453
	if (sense[1] & 40) {
J
Joe Perches 已提交
454
		pr_info("Drive not ready - command aborted\n");
455 456 457 458
		goto cleanup_sense;
	}
	sense_key = sense[1] & 0x0F;
	if (sense_key < ARRAY_SIZE(sense_texts))
J
Joe Perches 已提交
459
		pr_info("%s\n", sense_texts[sense_key].text);
460
	else
J
Joe Perches 已提交
461
		pr_err("Unknown sense key: %d\n", sense_key);
462 463 464 465 466 467 468 469 470 471 472 473
	if (bufstring) /* return addional sense data */
		memcpy(bufstring, &sense[4], 2);
	if (sense_key < 2)
		err = 0;

cleanup_sense:
	gd.pending = 0;
cleanup_sense_final:
	kfree(sense_command);
	return err;
}

474 475 476 477 478 479
static int gdrom_audio_ioctl(struct cdrom_device_info *cdi, unsigned int cmd,
			     void *arg)
{
	return -EINVAL;
}

480 481 482 483 484 485 486
static struct cdrom_device_ops gdrom_ops = {
	.open			= gdrom_open,
	.release		= gdrom_release,
	.drive_status		= gdrom_drivestatus,
	.media_changed		= gdrom_mediachanged,
	.get_last_session	= gdrom_get_last_session,
	.reset			= gdrom_hardreset,
487
	.audio_ioctl		= gdrom_audio_ioctl,
488 489 490 491 492
	.capability		= CDC_MULTI_SESSION | CDC_MEDIA_CHANGED |
				  CDC_RESET | CDC_DRIVE_STATUS | CDC_CD_R,
	.n_minors		= 1,
};

A
Al Viro 已提交
493
static int gdrom_bdops_open(struct block_device *bdev, fmode_t mode)
494
{
A
Al Viro 已提交
495
	return cdrom_open(gd.cd_info, bdev, mode);
496 497
}

N
Nobuhiro Iwamatsu 已提交
498
static int gdrom_bdops_release(struct gendisk *disk, fmode_t mode)
499
{
N
Nobuhiro Iwamatsu 已提交
500 501
	cdrom_release(gd.cd_info, mode);
	return 0;
502 503 504 505 506 507 508
}

static int gdrom_bdops_mediachanged(struct gendisk *disk)
{
	return cdrom_media_changed(gd.cd_info);
}

A
Al Viro 已提交
509
static int gdrom_bdops_ioctl(struct block_device *bdev, fmode_t mode,
510 511
	unsigned cmd, unsigned long arg)
{
A
Al Viro 已提交
512
	return cdrom_ioctl(gd.cd_info, bdev, mode, cmd, arg);
513 514
}

515
static const struct block_device_operations gdrom_bdops = {
516
	.owner			= THIS_MODULE,
A
Al Viro 已提交
517 518
	.open			= gdrom_bdops_open,
	.release		= gdrom_bdops_release,
519
	.media_changed		= gdrom_bdops_mediachanged,
A
Al Viro 已提交
520
	.locked_ioctl		= gdrom_bdops_ioctl,
521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586
};

static irqreturn_t gdrom_command_interrupt(int irq, void *dev_id)
{
	gd.status = ctrl_inb(GDROM_STATUSCOMMAND_REG);
	if (gd.pending != 1)
		return IRQ_HANDLED;
	gd.pending = 0;
	wake_up_interruptible(&command_queue);
	return IRQ_HANDLED;
}

static irqreturn_t gdrom_dma_interrupt(int irq, void *dev_id)
{
	gd.status = ctrl_inb(GDROM_STATUSCOMMAND_REG);
	if (gd.transfer != 1)
		return IRQ_HANDLED;
	gd.transfer = 0;
	wake_up_interruptible(&request_queue);
	return IRQ_HANDLED;
}

static int __devinit gdrom_set_interrupt_handlers(void)
{
	int err;

	err = request_irq(HW_EVENT_GDROM_CMD, gdrom_command_interrupt,
		IRQF_DISABLED, "gdrom_command", &gd);
	if (err)
		return err;
	err = request_irq(HW_EVENT_GDROM_DMA, gdrom_dma_interrupt,
		IRQF_DISABLED, "gdrom_dma", &gd);
	if (err)
		free_irq(HW_EVENT_GDROM_CMD, &gd);
	return err;
}

/* Implement DMA read using SPI command
 * 0 -> 0x30
 * 1 -> mode
 * 2 -> block >> 16
 * 3 -> block >> 8
 * 4 -> block
 * 8 -> sectors >> 16
 * 9 -> sectors >> 8
 * 10 -> sectors
 */
static void gdrom_readdisk_dma(struct work_struct *work)
{
	int err, block, block_cnt;
	struct packet_command *read_command;
	struct list_head *elem, *next;
	struct request *req;
	unsigned long timeout;

	if (list_empty(&gdrom_deferred))
		return;
	read_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
	if (!read_command)
		return; /* get more memory later? */
	read_command->cmd[0] = 0x30;
	read_command->cmd[1] = 0x20;
	spin_lock(&gdrom_lock);
	list_for_each_safe(elem, next, &gdrom_deferred) {
		req = list_entry(elem, struct request, queuelist);
		spin_unlock(&gdrom_lock);
587 588
		block = blk_rq_pos(req)/GD_TO_BLK + GD_SESSION_OFFSET;
		block_cnt = blk_rq_sectors(req)/GD_TO_BLK;
P
Paul Mundt 已提交
589
		ctrl_outl(virt_to_phys(req->buffer), GDROM_DMA_STARTADDR_REG);
590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617
		ctrl_outl(block_cnt * GDROM_HARD_SECTOR, GDROM_DMA_LENGTH_REG);
		ctrl_outl(1, GDROM_DMA_DIRECTION_REG);
		ctrl_outl(1, GDROM_DMA_ENABLE_REG);
		read_command->cmd[2] = (block >> 16) & 0xFF;
		read_command->cmd[3] = (block >> 8) & 0xFF;
		read_command->cmd[4] = block & 0xFF;
		read_command->cmd[8] = (block_cnt >> 16) & 0xFF;
		read_command->cmd[9] = (block_cnt >> 8) & 0xFF;
		read_command->cmd[10] = block_cnt & 0xFF;
		/* set for DMA */
		ctrl_outb(1, GDROM_ERROR_REG);
		/* other registers */
		ctrl_outb(0, GDROM_SECNUM_REG);
		ctrl_outb(0, GDROM_BCL_REG);
		ctrl_outb(0, GDROM_BCH_REG);
		ctrl_outb(0, GDROM_DSEL_REG);
		ctrl_outb(0, GDROM_INTSEC_REG);
		/* Wait for registers to reset after any previous activity */
		timeout = jiffies + HZ / 2;
		while (gdrom_is_busy() && time_before(jiffies, timeout))
			cpu_relax();
		ctrl_outb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG);
		timeout = jiffies + HZ / 2;
		/* Wait for packet command to finish */
		while (gdrom_is_busy() && time_before(jiffies, timeout))
			cpu_relax();
		gd.pending = 1;
		gd.transfer = 1;
P
Paul Mundt 已提交
618
		outsw(GDROM_DATA_REG, &read_command->cmd, 6);
619 620 621 622 623 624 625 626 627
		timeout = jiffies + HZ / 2;
		/* Wait for any pending DMA to finish */
		while (ctrl_inb(GDROM_DMA_STATUS_REG) &&
			time_before(jiffies, timeout))
			cpu_relax();
		/* start transfer */
		ctrl_outb(1, GDROM_DMA_STATUS_REG);
		wait_event_interruptible_timeout(request_queue,
			gd.transfer == 0, GDROM_DEFAULT_TIMEOUT);
628
		err = gd.transfer ? -EIO : 0;
629 630 631 632 633 634
		gd.transfer = 0;
		gd.pending = 0;
		/* now seek to take the request spinlock
		* before handling ending the request */
		spin_lock(&gdrom_lock);
		list_del_init(&req->queuelist);
635
		__blk_end_request_all(req, err);
636 637 638 639 640 641 642 643 644
	}
	spin_unlock(&gdrom_lock);
	kfree(read_command);
}

static void gdrom_request(struct request_queue *rq)
{
	struct request *req;

645
	while ((req = blk_fetch_request(rq)) != NULL) {
646
		if (req->cmd_type != REQ_TYPE_FS) {
J
Joe Perches 已提交
647
			printk(KERN_DEBUG "gdrom: Non-fs request ignored\n");
T
Tejun Heo 已提交
648 649
			__blk_end_request_all(req, -EIO);
			continue;
650 651
		}
		if (rq_data_dir(req) != READ) {
J
Joe Perches 已提交
652
			pr_notice("Read only device - write request ignored\n");
T
Tejun Heo 已提交
653 654
			__blk_end_request_all(req, -EIO);
			continue;
655
		}
T
Tejun Heo 已提交
656 657 658 659 660 661 662

		/*
		 * Add to list of deferred work and then schedule
		 * workqueue.
		 */
		list_add_tail(&req->queuelist, &gdrom_deferred);
		schedule_work(&work);
663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686
	}
}

/* Print string identifying GD ROM device */
static int __devinit gdrom_outputversion(void)
{
	struct gdrom_id *id;
	char *model_name, *manuf_name, *firmw_ver;
	int err = -ENOMEM;

	/* query device ID */
	id = kzalloc(sizeof(struct gdrom_id), GFP_KERNEL);
	if (!id)
		return err;
	gdrom_identifydevice(id);
	model_name = kstrndup(id->modname, 16, GFP_KERNEL);
	if (!model_name)
		goto free_id;
	manuf_name = kstrndup(id->mname, 16, GFP_KERNEL);
	if (!manuf_name)
		goto free_model_name;
	firmw_ver = kstrndup(id->firmver, 16, GFP_KERNEL);
	if (!firmw_ver)
		goto free_manuf_name;
J
Joe Perches 已提交
687
	pr_info("%s from %s with firmware %s\n",
688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740
		model_name, manuf_name, firmw_ver);
	err = 0;
	kfree(firmw_ver);
free_manuf_name:
	kfree(manuf_name);
free_model_name:
	kfree(model_name);
free_id:
	kfree(id);
	return err;
}

/* set the default mode for DMA transfer */
static int __devinit gdrom_init_dma_mode(void)
{
	ctrl_outb(0x13, GDROM_ERROR_REG);
	ctrl_outb(0x22, GDROM_INTSEC_REG);
	if (!gdrom_wait_clrbusy())
		return -EBUSY;
	ctrl_outb(0xEF, GDROM_STATUSCOMMAND_REG);
	if (!gdrom_wait_busy_sleeps())
		return -EBUSY;
	/* Memory protection setting for GDROM DMA
	* Bits 31 - 16 security: 0x8843
	* Bits 15 and 7 reserved (0)
	* Bits 14 - 8 start of transfer range in 1 MB blocks OR'ed with 0x80
	* Bits 6 - 0 end of transfer range in 1 MB blocks OR'ed with 0x80
	* (0x40 | 0x80) = start range at 0x0C000000
	* (0x7F | 0x80) = end range at 0x0FFFFFFF */
	ctrl_outl(0x8843407F, GDROM_DMA_ACCESS_CTRL_REG);
	ctrl_outl(9, GDROM_DMA_WAIT_REG); /* DMA word setting */
	return 0;
}

static void __devinit probe_gdrom_setupcd(void)
{
	gd.cd_info->ops = &gdrom_ops;
	gd.cd_info->capacity = 1;
	strcpy(gd.cd_info->name, GDROM_DEV_NAME);
	gd.cd_info->mask = CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|
		CDC_SELECT_DISC;
}

static void __devinit probe_gdrom_setupdisk(void)
{
	gd.disk->major = gdrom_major;
	gd.disk->first_minor = 1;
	gd.disk->minors = 1;
	strcpy(gd.disk->disk_name, GDROM_DEV_NAME);
}

static int __devinit probe_gdrom_setupqueue(void)
{
741
	blk_queue_logical_block_size(gd.gdrom_rq, GDROM_HARD_SECTOR);
742
	/* using DMA so memory will need to be contiguous */
743
	blk_queue_max_segments(gd.gdrom_rq, 1);
744 745 746 747 748 749 750 751 752 753 754 755 756 757 758
	/* set a large max size to get most from DMA */
	blk_queue_max_segment_size(gd.gdrom_rq, 0x40000);
	gd.disk->queue = gd.gdrom_rq;
	return gdrom_init_dma_mode();
}

/*
 * register this as a block device and as compliant with the
 * universal CD Rom driver interface
 */
static int __devinit probe_gdrom(struct platform_device *devptr)
{
	int err;
	/* Start the device */
	if (gdrom_execute_diagnostic() != 1) {
J
Joe Perches 已提交
759
		pr_warning("ATA Probe for GDROM failed\n");
760 761 762 763 764 765 766 767 768
		return -ENODEV;
	}
	/* Print out firmware ID */
	if (gdrom_outputversion())
		return -ENOMEM;
	/* Register GDROM */
	gdrom_major = register_blkdev(0, GDROM_DEV_NAME);
	if (gdrom_major <= 0)
		return gdrom_major;
J
Joe Perches 已提交
769
	pr_info("Registered with major number %d\n",
770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819
		gdrom_major);
	/* Specify basic properties of drive */
	gd.cd_info = kzalloc(sizeof(struct cdrom_device_info), GFP_KERNEL);
	if (!gd.cd_info) {
		err = -ENOMEM;
		goto probe_fail_no_mem;
	}
	probe_gdrom_setupcd();
	gd.disk = alloc_disk(1);
	if (!gd.disk) {
		err = -ENODEV;
		goto probe_fail_no_disk;
	}
	probe_gdrom_setupdisk();
	if (register_cdrom(gd.cd_info)) {
		err = -ENODEV;
		goto probe_fail_cdrom_register;
	}
	gd.disk->fops = &gdrom_bdops;
	/* latch on to the interrupt */
	err = gdrom_set_interrupt_handlers();
	if (err)
		goto probe_fail_cmdirq_register;
	gd.gdrom_rq = blk_init_queue(gdrom_request, &gdrom_lock);
	if (!gd.gdrom_rq)
		goto probe_fail_requestq;

	err = probe_gdrom_setupqueue();
	if (err)
		goto probe_fail_toc;

	gd.toc = kzalloc(sizeof(struct gdromtoc), GFP_KERNEL);
	if (!gd.toc)
		goto probe_fail_toc;
	add_disk(gd.disk);
	return 0;

probe_fail_toc:
	blk_cleanup_queue(gd.gdrom_rq);
probe_fail_requestq:
	free_irq(HW_EVENT_GDROM_DMA, &gd);
	free_irq(HW_EVENT_GDROM_CMD, &gd);
probe_fail_cmdirq_register:
probe_fail_cdrom_register:
	del_gendisk(gd.disk);
probe_fail_no_disk:
	kfree(gd.cd_info);
	unregister_blkdev(gdrom_major, GDROM_DEV_NAME);
	gdrom_major = 0;
probe_fail_no_mem:
J
Joe Perches 已提交
820
	pr_warning("Probe failed - error is 0x%X\n", err);
821 822 823 824 825 826 827 828 829 830 831 832
	return err;
}

static int __devexit remove_gdrom(struct platform_device *devptr)
{
	flush_scheduled_work();
	blk_cleanup_queue(gd.gdrom_rq);
	free_irq(HW_EVENT_GDROM_CMD, &gd);
	free_irq(HW_EVENT_GDROM_DMA, &gd);
	del_gendisk(gd.disk);
	if (gdrom_major)
		unregister_blkdev(gdrom_major, GDROM_DEV_NAME);
833 834 835
	unregister_cdrom(gd.cd_info);

	return 0;
836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872
}

static struct platform_driver gdrom_driver = {
	.probe = probe_gdrom,
	.remove = __devexit_p(remove_gdrom),
	.driver = {
			.name = GDROM_DEV_NAME,
	},
};

static int __init init_gdrom(void)
{
	int rc;
	gd.toc = NULL;
	rc = platform_driver_register(&gdrom_driver);
	if (rc)
		return rc;
	pd = platform_device_register_simple(GDROM_DEV_NAME, -1, NULL, 0);
	if (IS_ERR(pd)) {
		platform_driver_unregister(&gdrom_driver);
		return PTR_ERR(pd);
	}
	return 0;
}

static void __exit exit_gdrom(void)
{
	platform_device_unregister(pd);
	platform_driver_unregister(&gdrom_driver);
	kfree(gd.toc);
}

module_init(init_gdrom);
module_exit(exit_gdrom);
MODULE_AUTHOR("Adrian McMenamin <adrian@mcmen.demon.co.uk>");
MODULE_DESCRIPTION("SEGA Dreamcast GD-ROM Driver");
MODULE_LICENSE("GPL");