block.c 14.2 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1 2 3 4
/*
 * Block driver for media (i.e., flash cards)
 *
 * Copyright 2002 Hewlett-Packard Company
5
 * Copyright 2005-2008 Pierre Ossman
Linus Torvalds's avatar
Linus Torvalds committed
6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29
 *
 * Use consistent with the GNU GPL is permitted,
 * provided that this copyright notice is
 * preserved in its entirety in all copies and derived works.
 *
 * HEWLETT-PACKARD COMPANY MAKES NO WARRANTIES, EXPRESSED OR IMPLIED,
 * AS TO THE USEFULNESS OR CORRECTNESS OF THIS CODE OR ITS
 * FITNESS FOR ANY PARTICULAR PURPOSE.
 *
 * Many thanks to Alessandro Rubini and Jonathan Corbet!
 *
 * Author:  Andrew Christian
 *          28 May 2002
 */
#include <linux/moduleparam.h>
#include <linux/module.h>
#include <linux/init.h>

#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/errno.h>
#include <linux/hdreg.h>
#include <linux/kdev_t.h>
#include <linux/blkdev.h>
30
#include <linux/mutex.h>
31
#include <linux/scatterlist.h>
Linus Torvalds's avatar
Linus Torvalds committed
32 33

#include <linux/mmc/card.h>
34
#include <linux/mmc/host.h>
Pierre Ossman's avatar
Pierre Ossman committed
35 36
#include <linux/mmc/mmc.h>
#include <linux/mmc/sd.h>
Linus Torvalds's avatar
Linus Torvalds committed
37 38 39 40

#include <asm/system.h>
#include <asm/uaccess.h>

41
#include "queue.h"
Linus Torvalds's avatar
Linus Torvalds committed
42 43 44 45 46

/*
 * max 8 partitions per card
 */
#define MMC_SHIFT	3
47 48
#define MMC_NUM_MINORS	(256 >> MMC_SHIFT)

49
static DECLARE_BITMAP(dev_use, MMC_NUM_MINORS);
Linus Torvalds's avatar
Linus Torvalds committed
50 51 52 53 54 55 56 57 58 59 60

/*
 * There is one mmc_blk_data per slot.
 */
struct mmc_blk_data {
	spinlock_t	lock;
	struct gendisk	*disk;
	struct mmc_queue queue;

	unsigned int	usage;
	unsigned int	block_bits;
61
	unsigned int	read_only;
Linus Torvalds's avatar
Linus Torvalds committed
62 63
};

64
static DEFINE_MUTEX(open_lock);
Linus Torvalds's avatar
Linus Torvalds committed
65 66 67 68 69

static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
{
	struct mmc_blk_data *md;

70
	mutex_lock(&open_lock);
Linus Torvalds's avatar
Linus Torvalds committed
71 72 73 74 75
	md = disk->private_data;
	if (md && md->usage == 0)
		md = NULL;
	if (md)
		md->usage++;
76
	mutex_unlock(&open_lock);
Linus Torvalds's avatar
Linus Torvalds committed
77 78 79 80 81 82

	return md;
}

static void mmc_blk_put(struct mmc_blk_data *md)
{
83
	mutex_lock(&open_lock);
Linus Torvalds's avatar
Linus Torvalds committed
84 85
	md->usage--;
	if (md->usage == 0) {
86 87 88
		int devidx = md->disk->first_minor >> MMC_SHIFT;
		__clear_bit(devidx, dev_use);

Linus Torvalds's avatar
Linus Torvalds committed
89 90 91
		put_disk(md->disk);
		kfree(md);
	}
92
	mutex_unlock(&open_lock);
Linus Torvalds's avatar
Linus Torvalds committed
93 94 95 96 97 98 99 100 101 102 103 104
}

static int mmc_blk_open(struct inode *inode, struct file *filp)
{
	struct mmc_blk_data *md;
	int ret = -ENXIO;

	md = mmc_blk_get(inode->i_bdev->bd_disk);
	if (md) {
		if (md->usage == 2)
			check_disk_change(inode->i_bdev);
		ret = 0;
Pierre Ossman's avatar
Pierre Ossman committed
105

106
		if ((filp->f_mode & FMODE_WRITE) && md->read_only)
Pierre Ossman's avatar
Pierre Ossman committed
107
			ret = -EROFS;
Linus Torvalds's avatar
Linus Torvalds committed
108 109 110 111 112 113 114 115 116 117 118 119 120 121
	}

	return ret;
}

static int mmc_blk_release(struct inode *inode, struct file *filp)
{
	struct mmc_blk_data *md = inode->i_bdev->bd_disk->private_data;

	mmc_blk_put(md);
	return 0;
}

static int
122
mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
Linus Torvalds's avatar
Linus Torvalds committed
123
{
124 125 126 127
	geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
	geo->heads = 4;
	geo->sectors = 16;
	return 0;
Linus Torvalds's avatar
Linus Torvalds committed
128 129 130 131 132
}

static struct block_device_operations mmc_bdops = {
	.open			= mmc_blk_open,
	.release		= mmc_blk_release,
133
	.getgeo			= mmc_blk_getgeo,
Linus Torvalds's avatar
Linus Torvalds committed
134 135 136 137 138 139 140 141 142 143
	.owner			= THIS_MODULE,
};

struct mmc_blk_request {
	struct mmc_request	mrq;
	struct mmc_command	cmd;
	struct mmc_command	stop;
	struct mmc_data		data;
};

144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159
static u32 mmc_sd_num_wr_blocks(struct mmc_card *card)
{
	int err;
	u32 blocks;

	struct mmc_request mrq;
	struct mmc_command cmd;
	struct mmc_data data;
	unsigned int timeout_us;

	struct scatterlist sg;

	memset(&cmd, 0, sizeof(struct mmc_command));

	cmd.opcode = MMC_APP_CMD;
	cmd.arg = card->rca << 16;
David Brownell's avatar
David Brownell committed
160
	cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
161 162

	err = mmc_wait_for_cmd(card->host, &cmd, 0);
David Brownell's avatar
David Brownell committed
163 164 165
	if (err)
		return (u32)-1;
	if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
166 167 168 169 170 171
		return (u32)-1;

	memset(&cmd, 0, sizeof(struct mmc_command));

	cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
	cmd.arg = 0;
David Brownell's avatar
David Brownell committed
172
	cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
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

	memset(&data, 0, sizeof(struct mmc_data));

	data.timeout_ns = card->csd.tacc_ns * 100;
	data.timeout_clks = card->csd.tacc_clks * 100;

	timeout_us = data.timeout_ns / 1000;
	timeout_us += data.timeout_clks * 1000 /
		(card->host->ios.clock / 1000);

	if (timeout_us > 100000) {
		data.timeout_ns = 100000000;
		data.timeout_clks = 0;
	}

	data.blksz = 4;
	data.blocks = 1;
	data.flags = MMC_DATA_READ;
	data.sg = &sg;
	data.sg_len = 1;

	memset(&mrq, 0, sizeof(struct mmc_request));

	mrq.cmd = &cmd;
	mrq.data = &data;

	sg_init_one(&sg, &blocks, 4);

	mmc_wait_for_req(card->host, &mrq);

Pierre Ossman's avatar
Pierre Ossman committed
203
	if (cmd.error || data.error)
204 205 206 207 208 209 210
		return (u32)-1;

	blocks = ntohl(blocks);

	return blocks;
}

Linus Torvalds's avatar
Linus Torvalds committed
211 212 213 214
static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
{
	struct mmc_blk_data *md = mq->data;
	struct mmc_card *card = md->queue.card;
215
	struct mmc_blk_request brq;
216
	int ret = 1, sg_pos, data_size;
Linus Torvalds's avatar
Linus Torvalds committed
217

218
	mmc_claim_host(card->host);
Linus Torvalds's avatar
Linus Torvalds committed
219 220 221

	do {
		struct mmc_command cmd;
222
		u32 readcmd, writecmd;
Linus Torvalds's avatar
Linus Torvalds committed
223 224 225 226 227

		memset(&brq, 0, sizeof(struct mmc_blk_request));
		brq.mrq.cmd = &brq.cmd;
		brq.mrq.data = &brq.data;

228 229 230
		brq.cmd.arg = req->sector;
		if (!mmc_card_blockaddr(card))
			brq.cmd.arg <<= 9;
David Brownell's avatar
David Brownell committed
231
		brq.cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
232
		brq.data.blksz = 1 << md->block_bits;
Linus Torvalds's avatar
Linus Torvalds committed
233 234
		brq.stop.opcode = MMC_STOP_TRANSMISSION;
		brq.stop.arg = 0;
David Brownell's avatar
David Brownell committed
235
		brq.stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
236 237 238
		brq.data.blocks = req->nr_sectors >> (md->block_bits - 9);
		if (brq.data.blocks > card->host->max_blk_count)
			brq.data.blocks = card->host->max_blk_count;
Linus Torvalds's avatar
Linus Torvalds committed
239

240 241
		/*
		 * If the host doesn't support multiple block writes, force
242 243 244
		 * block writes to single block. SD cards are excepted from
		 * this rule as they support querying the number of
		 * successfully written sectors.
245 246
		 */
		if (rq_data_dir(req) != READ &&
247 248
		    !(card->host->caps & MMC_CAP_MULTIWRITE) &&
		    !mmc_card_sd(card))
Linus Torvalds's avatar
Linus Torvalds committed
249
			brq.data.blocks = 1;
Russell King's avatar
Russell King committed
250 251

		if (brq.data.blocks > 1) {
David Brownell's avatar
David Brownell committed
252 253 254 255 256 257
			/* SPI multiblock writes terminate using a special
			 * token, not a STOP_TRANSMISSION request.
			 */
			if (!mmc_host_is_spi(card->host)
					|| rq_data_dir(req) == READ)
				brq.mrq.stop = &brq.stop;
258 259
			readcmd = MMC_READ_MULTIPLE_BLOCK;
			writecmd = MMC_WRITE_MULTIPLE_BLOCK;
Russell King's avatar
Russell King committed
260 261
		} else {
			brq.mrq.stop = NULL;
262 263 264 265 266 267 268 269 270 271
			readcmd = MMC_READ_SINGLE_BLOCK;
			writecmd = MMC_WRITE_BLOCK;
		}

		if (rq_data_dir(req) == READ) {
			brq.cmd.opcode = readcmd;
			brq.data.flags |= MMC_DATA_READ;
		} else {
			brq.cmd.opcode = writecmd;
			brq.data.flags |= MMC_DATA_WRITE;
Russell King's avatar
Russell King committed
272
		}
Linus Torvalds's avatar
Linus Torvalds committed
273

274 275
		mmc_set_data_timeout(&brq.data, card);

Linus Torvalds's avatar
Linus Torvalds committed
276
		brq.data.sg = mq->sg;
277 278 279
		brq.data.sg_len = mmc_queue_map_sg(mq);

		mmc_queue_bounce_pre(mq);
Linus Torvalds's avatar
Linus Torvalds committed
280

281 282 283 284 285 286 287 288 289 290 291 292 293 294
		if (brq.data.blocks !=
		    (req->nr_sectors >> (md->block_bits - 9))) {
			data_size = brq.data.blocks * brq.data.blksz;
			for (sg_pos = 0; sg_pos < brq.data.sg_len; sg_pos++) {
				data_size -= mq->sg[sg_pos].length;
				if (data_size <= 0) {
					mq->sg[sg_pos].length += data_size;
					sg_pos++;
					break;
				}
			}
			brq.data.sg_len = sg_pos;
		}

Linus Torvalds's avatar
Linus Torvalds committed
295
		mmc_wait_for_req(card->host, &brq.mrq);
296 297 298

		mmc_queue_bounce_post(mq);

299 300 301 302 303
		/*
		 * Check for errors here, but don't jump to cmd_err
		 * until later as we need to wait for the card to leave
		 * programming mode even when things go wrong.
		 */
Linus Torvalds's avatar
Linus Torvalds committed
304 305 306 307 308 309 310 311 312 313 314 315 316 317 318
		if (brq.cmd.error) {
			printk(KERN_ERR "%s: error %d sending read/write command\n",
			       req->rq_disk->disk_name, brq.cmd.error);
		}

		if (brq.data.error) {
			printk(KERN_ERR "%s: error %d transferring data\n",
			       req->rq_disk->disk_name, brq.data.error);
		}

		if (brq.stop.error) {
			printk(KERN_ERR "%s: error %d sending stop command\n",
			       req->rq_disk->disk_name, brq.stop.error);
		}

David Brownell's avatar
David Brownell committed
319
		if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
320 321 322 323 324 325 326 327 328 329 330 331
			do {
				int err;

				cmd.opcode = MMC_SEND_STATUS;
				cmd.arg = card->rca << 16;
				cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
				err = mmc_wait_for_cmd(card->host, &cmd, 5);
				if (err) {
					printk(KERN_ERR "%s: error %d requesting status\n",
					       req->rq_disk->disk_name, err);
					goto cmd_err;
				}
332 333 334 335 336 337 338
				/*
				 * Some cards mishandle the status bits,
				 * so make sure to check both the busy
				 * indication and the card state.
				 */
			} while (!(cmd.resp[0] & R1_READY_FOR_DATA) ||
				(R1_CURRENT_STATE(cmd.resp[0]) == 7));
Linus Torvalds's avatar
Linus Torvalds committed
339 340

#if 0
341 342 343 344 345
			if (cmd.resp[0] & ~0x00000900)
				printk(KERN_ERR "%s: status = %08x\n",
				       req->rq_disk->disk_name, cmd.resp[0]);
			if (mmc_decode_status(cmd.resp))
				goto cmd_err;
Linus Torvalds's avatar
Linus Torvalds committed
346
#endif
347
		}
Linus Torvalds's avatar
Linus Torvalds committed
348

349 350 351
		if (brq.cmd.error || brq.data.error || brq.stop.error)
			goto cmd_err;

Linus Torvalds's avatar
Linus Torvalds committed
352 353 354 355
		/*
		 * A block was successfully transferred.
		 */
		spin_lock_irq(&md->lock);
356
		ret = __blk_end_request(req, 0, brq.data.bytes_xfered);
Linus Torvalds's avatar
Linus Torvalds committed
357 358 359
		spin_unlock_irq(&md->lock);
	} while (ret);

360
	mmc_release_host(card->host);
Linus Torvalds's avatar
Linus Torvalds committed
361 362 363 364

	return 1;

 cmd_err:
365 366 367 368 369 370
 	/*
 	 * If this is an SD card and we're writing, we can first
 	 * mark the known good sectors as ok.
 	 *
	 * If the card is not SD, we can still ok written sectors
	 * if the controller can do proper error reporting.
371 372 373
	 *
	 * For reads we just fail the entire chunk as that should
	 * be safe in all cases.
Linus Torvalds's avatar
Linus Torvalds committed
374
	 */
375 376 377 378 379 380 381 382 383 384 385
 	if (rq_data_dir(req) != READ && mmc_card_sd(card)) {
		u32 blocks;
		unsigned int bytes;

		blocks = mmc_sd_num_wr_blocks(card);
		if (blocks != (u32)-1) {
			if (card->csd.write_partial)
				bytes = blocks << md->block_bits;
			else
				bytes = blocks << 9;
			spin_lock_irq(&md->lock);
386
			ret = __blk_end_request(req, 0, bytes);
387 388 389 390
			spin_unlock_irq(&md->lock);
		}
	} else if (rq_data_dir(req) != READ &&
		   (card->host->caps & MMC_CAP_MULTIWRITE)) {
391
		spin_lock_irq(&md->lock);
392
		ret = __blk_end_request(req, 0, brq.data.bytes_xfered);
393 394 395
		spin_unlock_irq(&md->lock);
	}

396
	mmc_release_host(card->host);
397

Linus Torvalds's avatar
Linus Torvalds committed
398
	spin_lock_irq(&md->lock);
399 400
	while (ret)
		ret = __blk_end_request(req, -EIO, blk_rq_cur_bytes(req));
Linus Torvalds's avatar
Linus Torvalds committed
401 402 403 404 405 406
	spin_unlock_irq(&md->lock);

	return 0;
}


407 408 409 410 411 412
static inline int mmc_blk_readonly(struct mmc_card *card)
{
	return mmc_card_readonly(card) ||
	       !(card->csd.cmdclass & CCC_BLOCK_WRITE);
}

Linus Torvalds's avatar
Linus Torvalds committed
413 414 415 416 417 418 419 420 421 422
static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
{
	struct mmc_blk_data *md;
	int devidx, ret;

	devidx = find_first_zero_bit(dev_use, MMC_NUM_MINORS);
	if (devidx >= MMC_NUM_MINORS)
		return ERR_PTR(-ENOSPC);
	__set_bit(devidx, dev_use);

423
	md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
424 425 426 427
	if (!md) {
		ret = -ENOMEM;
		goto out;
	}
Linus Torvalds's avatar
Linus Torvalds committed
428 429


430 431 432 433 434
	/*
	 * Set the read-only status based on the supported commands
	 * and the write protect switch.
	 */
	md->read_only = mmc_blk_readonly(card);
Linus Torvalds's avatar
Linus Torvalds committed
435

436
	/*
437 438 439
	 * Both SD and MMC specifications state (although a bit
	 * unclearly in the MMC case) that a block size of 512
	 * bytes must always be supported by the card.
440
	 */
441
	md->block_bits = 9;
Linus Torvalds's avatar
Linus Torvalds committed
442

443 444 445 446 447
	md->disk = alloc_disk(1 << MMC_SHIFT);
	if (md->disk == NULL) {
		ret = -ENOMEM;
		goto err_kfree;
	}
Linus Torvalds's avatar
Linus Torvalds committed
448

449 450
	spin_lock_init(&md->lock);
	md->usage = 1;
Linus Torvalds's avatar
Linus Torvalds committed
451

452 453 454
	ret = mmc_init_queue(&md->queue, card, &md->lock);
	if (ret)
		goto err_putdisk;
Linus Torvalds's avatar
Linus Torvalds committed
455

456 457
	md->queue.issue_fn = mmc_blk_issue_rq;
	md->queue.data = md;
458

459
	md->disk->major	= MMC_BLOCK_MAJOR;
460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481
	md->disk->first_minor = devidx << MMC_SHIFT;
	md->disk->fops = &mmc_bdops;
	md->disk->private_data = md;
	md->disk->queue = md->queue.queue;
	md->disk->driverfs_dev = &card->dev;

	/*
	 * As discussed on lkml, GENHD_FL_REMOVABLE should:
	 *
	 * - be set for removable media with permanent block devices
	 * - be unset for removable block devices with permanent media
	 *
	 * Since MMC block devices clearly fall under the second
	 * case, we do not set GENHD_FL_REMOVABLE.  Userspace
	 * should use the block device creation/destruction hotplug
	 * messages to tell when the card is present.
	 */

	sprintf(md->disk->disk_name, "mmcblk%d", devidx);

	blk_queue_hardsect_size(md->queue.queue, 1 << md->block_bits);

Pierre Ossman's avatar
Pierre Ossman committed
482 483 484 485 486 487 488 489 490 491 492 493 494 495
	if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
		/*
		 * The EXT_CSD sector count is in number or 512 byte
		 * sectors.
		 */
		set_capacity(md->disk, card->ext_csd.sectors);
	} else {
		/*
		 * The CSD capacity field is in units of read_blkbits.
		 * set_capacity takes units of 512 bytes.
		 */
		set_capacity(md->disk,
			card->csd.capacity << (card->csd.read_blkbits - 9));
	}
Linus Torvalds's avatar
Linus Torvalds committed
496
	return md;
497 498 499 500 501 502 503

 err_putdisk:
	put_disk(md->disk);
 err_kfree:
	kfree(md);
 out:
	return ERR_PTR(ret);
Linus Torvalds's avatar
Linus Torvalds committed
504 505 506 507 508 509 510 511
}

static int
mmc_blk_set_blksize(struct mmc_blk_data *md, struct mmc_card *card)
{
	struct mmc_command cmd;
	int err;

512 513 514 515
	/* Block-addressed cards ignore MMC_SET_BLOCKLEN. */
	if (mmc_card_blockaddr(card))
		return 0;

516
	mmc_claim_host(card->host);
Linus Torvalds's avatar
Linus Torvalds committed
517
	cmd.opcode = MMC_SET_BLOCKLEN;
518
	cmd.arg = 1 << md->block_bits;
David Brownell's avatar
David Brownell committed
519
	cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
Linus Torvalds's avatar
Linus Torvalds committed
520
	err = mmc_wait_for_cmd(card->host, &cmd, 5);
521
	mmc_release_host(card->host);
Linus Torvalds's avatar
Linus Torvalds committed
522 523 524 525 526 527 528 529 530 531 532 533 534 535 536

	if (err) {
		printk(KERN_ERR "%s: unable to set block size to %d: %d\n",
			md->disk->disk_name, cmd.arg, err);
		return -EINVAL;
	}

	return 0;
}

static int mmc_blk_probe(struct mmc_card *card)
{
	struct mmc_blk_data *md;
	int err;

537 538 539 540
	/*
	 * Check that the card supports the command class(es) we need.
	 */
	if (!(card->csd.cmdclass & CCC_BLOCK_READ))
Linus Torvalds's avatar
Linus Torvalds committed
541 542 543 544 545 546 547 548 549 550
		return -ENODEV;

	md = mmc_blk_alloc(card);
	if (IS_ERR(md))
		return PTR_ERR(md);

	err = mmc_blk_set_blksize(md, card);
	if (err)
		goto out;

551
	printk(KERN_INFO "%s: %s %s %lluKiB %s\n",
Linus Torvalds's avatar
Linus Torvalds committed
552
		md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
553 554
		(unsigned long long)(get_capacity(md->disk) >> 1),
		md->read_only ? "(ro)" : "");
Linus Torvalds's avatar
Linus Torvalds committed
555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570

	mmc_set_drvdata(card, md);
	add_disk(md->disk);
	return 0;

 out:
	mmc_blk_put(md);

	return err;
}

static void mmc_blk_remove(struct mmc_card *card)
{
	struct mmc_blk_data *md = mmc_get_drvdata(card);

	if (md) {
571
		/* Stop new requests from getting into the queue */
Linus Torvalds's avatar
Linus Torvalds committed
572 573
		del_gendisk(md->disk);

574 575
		/* Then flush out any already in there */
		mmc_cleanup_queue(&md->queue);
Linus Torvalds's avatar
Linus Torvalds committed
576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621

		mmc_blk_put(md);
	}
	mmc_set_drvdata(card, NULL);
}

#ifdef CONFIG_PM
static int mmc_blk_suspend(struct mmc_card *card, pm_message_t state)
{
	struct mmc_blk_data *md = mmc_get_drvdata(card);

	if (md) {
		mmc_queue_suspend(&md->queue);
	}
	return 0;
}

static int mmc_blk_resume(struct mmc_card *card)
{
	struct mmc_blk_data *md = mmc_get_drvdata(card);

	if (md) {
		mmc_blk_set_blksize(md, card);
		mmc_queue_resume(&md->queue);
	}
	return 0;
}
#else
#define	mmc_blk_suspend	NULL
#define mmc_blk_resume	NULL
#endif

static struct mmc_driver mmc_driver = {
	.drv		= {
		.name	= "mmcblk",
	},
	.probe		= mmc_blk_probe,
	.remove		= mmc_blk_remove,
	.suspend	= mmc_blk_suspend,
	.resume		= mmc_blk_resume,
};

static int __init mmc_blk_init(void)
{
	int res = -ENOMEM;

622 623
	res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
	if (res)
Linus Torvalds's avatar
Linus Torvalds committed
624 625 626 627 628 629 630 631 632 633 634
		goto out;

	return mmc_register_driver(&mmc_driver);

 out:
	return res;
}

static void __exit mmc_blk_exit(void)
{
	mmc_unregister_driver(&mmc_driver);
635
	unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
Linus Torvalds's avatar
Linus Torvalds committed
636 637 638 639 640 641 642 643
}

module_init(mmc_blk_init);
module_exit(mmc_blk_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");