drivers/mmc/card/block.c

/*
 * Block driver for media (i.e., flash cards)
 *
 * Copyright 2002 Hewlett-Packard Company
 * Copyright 2005-2008 Pierre Ossman
 *
 * 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/slab.h>
#include <linux/errno.h>
#include <linux/hdreg.h>
#include <linux/kdev_t.h>
#include <linux/blkdev.h>
#include <linux/mutex.h>
#include <linux/scatterlist.h>
#include <linux/string_helpers.h>

#include <linux/mmc/card.h>
#include <linux/mmc/host.h>
#include <linux/mmc/mmc.h>
#include <linux/mmc/sd.h>

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

#include "queue.h"

MODULE_ALIAS("mmc:block");
#ifdef MODULE_PARAM_PREFIX
#undef MODULE_PARAM_PREFIX
#endif
#define MODULE_PARAM_PREFIX "mmcblk."

#define INAND_CMD38_ARG_EXT_CSD  113
#define INAND_CMD38_ARG_ERASE    0x00
#define INAND_CMD38_ARG_TRIM     0x01
#define INAND_CMD38_ARG_SECERASE 0x80
#define INAND_CMD38_ARG_SECTRIM1 0x81
#define INAND_CMD38_ARG_SECTRIM2 0x88

#define REL_WRITES_SUPPORTED(card) (mmc_card_mmc((card)) &&	\
    (((card)->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN) ||	\
     ((card)->ext_csd.rel_sectors)))

static DEFINE_MUTEX(block_mutex);

/*
 * The defaults come from config options but can be overriden by module
 * or bootarg options.
 */
static int perdev_minors = CONFIG_MMC_BLOCK_MINORS;

/*
 * We've only got one major, so number of mmcblk devices is
 * limited to 256 / number of minors per device.
 */
static int max_devices;

/* 256 minors, so at most 256 separate devices */
static DECLARE_BITMAP(dev_use, 256);

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

	unsigned int	usage;
	unsigned int	read_only;
	unsigned int	part_type;

	/*
	 * Only set in main mmc_blk_data associated
	 * with mmc_card with mmc_set_drvdata, and keeps
	 * track of the current selected device partition.
	 */
	unsigned int	part_curr;
	struct device_attribute force_ro;
};

static DEFINE_MUTEX(open_lock);

module_param(perdev_minors, int, 0444);
MODULE_PARM_DESC(perdev_minors, "Minors numbers to allocate per device");

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

	mutex_lock(&open_lock);
	md = disk->private_data;
	if (md && md->usage == 0)
		md = NULL;
	if (md)
		md->usage++;
	mutex_unlock(&open_lock);

	return md;
}

static inline int mmc_get_devidx(struct gendisk *disk)
{
	int devmaj = MAJOR(disk_devt(disk));
	int devidx = MINOR(disk_devt(disk)) / perdev_minors;

	if (!devmaj)
		devidx = disk->first_minor / perdev_minors;
	return devidx;
}

static void mmc_blk_put(struct mmc_blk_data *md)
{
	mutex_lock(&open_lock);
	md->usage--;
	if (md->usage == 0) {
		int devidx = mmc_get_devidx(md->disk);
		blk_cleanup_queue(md->queue.queue);

		__clear_bit(devidx, dev_use);

		put_disk(md->disk);
		kfree(md);
	}
	mutex_unlock(&open_lock);
}

static ssize_t force_ro_show(struct device *dev, struct device_attribute *attr,
			     char *buf)
{
	int ret;
	struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));

	ret = snprintf(buf, PAGE_SIZE, "%d",
		       get_disk_ro(dev_to_disk(dev)) ^
		       md->read_only);
	mmc_blk_put(md);
	return ret;
}

static ssize_t force_ro_store(struct device *dev, struct device_attribute *attr,
			      const char *buf, size_t count)
{
	int ret;
	char *end;
	struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
	unsigned long set = simple_strtoul(buf, &end, 0);
	if (end == buf) {
		ret = -EINVAL;
		goto out;
	}

	set_disk_ro(dev_to_disk(dev), set || md->read_only);
	ret = count;
out:
	mmc_blk_put(md);
	return ret;
}

static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
{
	struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
	int ret = -ENXIO;

	mutex_lock(&block_mutex);
	if (md) {
		if (md->usage == 2)
			check_disk_change(bdev);
		ret = 0;

		if ((mode & FMODE_WRITE) && md->read_only) {
			mmc_blk_put(md);
			ret = -EROFS;
		}
	}
	mutex_unlock(&block_mutex);

	return ret;
}

static int mmc_blk_release(struct gendisk *disk, fmode_t mode)
{
	struct mmc_blk_data *md = disk->private_data;

	mutex_lock(&block_mutex);
	mmc_blk_put(md);
	mutex_unlock(&block_mutex);
	return 0;
}

static int
mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
{
	geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
	geo->heads = 4;
	geo->sectors = 16;
	return 0;
}

static const struct block_device_operations mmc_bdops = {
	.open			= mmc_blk_open,
	.release		= mmc_blk_release,
	.getgeo			= mmc_blk_getgeo,
	.owner			= THIS_MODULE,
};

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

static inline int mmc_blk_part_switch(struct mmc_card *card,
				      struct mmc_blk_data *md)
{
	int ret;
	struct mmc_blk_data *main_md = mmc_get_drvdata(card);
	if (main_md->part_curr == md->part_type)
		return 0;

	if (mmc_card_mmc(card)) {
		card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
		card->ext_csd.part_config |= md->part_type;

		ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
				 EXT_CSD_PART_CONFIG, card->ext_csd.part_config,
				 card->ext_csd.part_time);
		if (ret)
			return ret;
}

	main_md->part_curr = md->part_type;
	return 0;
}

static u32 mmc_sd_num_wr_blocks(struct mmc_card *card)
{
	int err;
	u32 result;
	__be32 *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;
	cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;

	err = mmc_wait_for_cmd(card->host, &cmd, 0);
	if (err)
		return (u32)-1;
	if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
		return (u32)-1;

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

	cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
	cmd.arg = 0;
	cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;

	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;

	blocks = kmalloc(4, GFP_KERNEL);
	if (!blocks)
		return (u32)-1;

	sg_init_one(&sg, blocks, 4);

	mmc_wait_for_req(card->host, &mrq);

	result = ntohl(*blocks);
	kfree(blocks);

	if (cmd.error || data.error)
		result = (u32)-1;

	return result;
}

static u32 get_card_status(struct mmc_card *card, struct request *req)
{
	struct mmc_command cmd;
	int err;

	memset(&cmd, 0, sizeof(struct mmc_command));
	cmd.opcode = MMC_SEND_STATUS;
	if (!mmc_host_is_spi(card->host))
		cmd.arg = card->rca << 16;
	cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
	err = mmc_wait_for_cmd(card->host, &cmd, 0);
	if (err)
		printk(KERN_ERR "%s: error %d sending status command",
		       req->rq_disk->disk_name, err);
	return cmd.resp[0];
}

static int mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
{
	struct mmc_blk_data *md = mq->data;
	struct mmc_card *card = md->queue.card;
	unsigned int from, nr, arg;
	int err = 0;

	if (!mmc_can_erase(card)) {
		err = -EOPNOTSUPP;
		goto out;
	}

	from = blk_rq_pos(req);
	nr = blk_rq_sectors(req);

	if (mmc_can_trim(card))
		arg = MMC_TRIM_ARG;
	else
		arg = MMC_ERASE_ARG;

	if (card->quirks & MMC_QUIRK_INAND_CMD38) {
		err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
				 INAND_CMD38_ARG_EXT_CSD,
				 arg == MMC_TRIM_ARG ?
				 INAND_CMD38_ARG_TRIM :
				 INAND_CMD38_ARG_ERASE,
				 0);
		if (err)
			goto out;
	}
	err = mmc_erase(card, from, nr, arg);
out:
	spin_lock_irq(&md->lock);
	__blk_end_request(req, err, blk_rq_bytes(req));
	spin_unlock_irq(&md->lock);

	return err ? 0 : 1;
}

static int mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
				       struct request *req)
{
	struct mmc_blk_data *md = mq->data;
	struct mmc_card *card = md->queue.card;
	unsigned int from, nr, arg;
	int err = 0;

	if (!mmc_can_secure_erase_trim(card)) {
		err = -EOPNOTSUPP;
		goto out;
	}

	from = blk_rq_pos(req);
	nr = blk_rq_sectors(req);

	if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr))
		arg = MMC_SECURE_TRIM1_ARG;
	else
		arg = MMC_SECURE_ERASE_ARG;

	if (card->quirks & MMC_QUIRK_INAND_CMD38) {
		err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
				 INAND_CMD38_ARG_EXT_CSD,
				 arg == MMC_SECURE_TRIM1_ARG ?
				 INAND_CMD38_ARG_SECTRIM1 :
				 INAND_CMD38_ARG_SECERASE,
				 0);
		if (err)
			goto out;
	}
	err = mmc_erase(card, from, nr, arg);
	if (!err && arg == MMC_SECURE_TRIM1_ARG) {
		if (card->quirks & MMC_QUIRK_INAND_CMD38) {
			err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
					 INAND_CMD38_ARG_EXT_CSD,
					 INAND_CMD38_ARG_SECTRIM2,
					 0);
			if (err)
				goto out;
		}
		err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG);
	}
out:
	spin_lock_irq(&md->lock);
	__blk_end_request(req, err, blk_rq_bytes(req));
	spin_unlock_irq(&md->lock);

	return err ? 0 : 1;
}

static int mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
{
	struct mmc_blk_data *md = mq->data;

	/*
	 * No-op, only service this because we need REQ_FUA for reliable
	 * writes.
	 */
	spin_lock_irq(&md->lock);
	__blk_end_request_all(req, 0);
	spin_unlock_irq(&md->lock);

	return 1;
}

/*
 * Reformat current write as a reliable write, supporting
 * both legacy and the enhanced reliable write MMC cards.
 * In each transfer we'll handle only as much as a single
 * reliable write can handle, thus finish the request in
 * partial completions.
 */
static inline int mmc_apply_rel_rw(struct mmc_blk_request *brq,
				   struct mmc_card *card,
				   struct request *req)
{
	int err;
	struct mmc_command set_count;

	if (!(card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN)) {
		/* Legacy mode imposes restrictions on transfers. */
		if (!IS_ALIGNED(brq->cmd.arg, card->ext_csd.rel_sectors))
			brq->data.blocks = 1;

		if (brq->data.blocks > card->ext_csd.rel_sectors)
			brq->data.blocks = card->ext_csd.rel_sectors;
		else if (brq->data.blocks < card->ext_csd.rel_sectors)
			brq->data.blocks = 1;
	}

	memset(&set_count, 0, sizeof(struct mmc_command));
	set_count.opcode = MMC_SET_BLOCK_COUNT;
	set_count.arg = brq->data.blocks | (1 << 31);
	set_count.flags = MMC_RSP_R1 | MMC_CMD_AC;
	err = mmc_wait_for_cmd(card->host, &set_count, 0);
	if (err)
		printk(KERN_ERR "%s: error %d SET_BLOCK_COUNT\n",
		       req->rq_disk->disk_name, err);
	return err;
}

static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *req)
{
	struct mmc_blk_data *md = mq->data;
	struct mmc_card *card = md->queue.card;
	struct mmc_blk_request brq;
	int ret = 1, disable_multi = 0;

	/*
	 * Reliable writes are used to implement Forced Unit Access and
	 * REQ_META accesses, and are supported only on MMCs.
	 */
	bool do_rel_wr = ((req->cmd_flags & REQ_FUA) ||
			  (req->cmd_flags & REQ_META)) &&
		(rq_data_dir(req) == WRITE) &&
		REL_WRITES_SUPPORTED(card);

	do {
		struct mmc_command cmd;
		u32 readcmd, writecmd, status = 0;

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

		brq.cmd.arg = blk_rq_pos(req);
		if (!mmc_card_blockaddr(card))
			brq.cmd.arg <<= 9;
		brq.cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
		brq.data.blksz = 512;
		brq.stop.opcode = MMC_STOP_TRANSMISSION;
		brq.stop.arg = 0;
		brq.stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
		brq.data.blocks = blk_rq_sectors(req);

		/*
		 * The block layer doesn't support all sector count
		 * restrictions, so we need to be prepared for too big
		 * requests.
		 */
		if (brq.data.blocks > card->host->max_blk_count)
			brq.data.blocks = card->host->max_blk_count;

		/*
		 * After a read error, we redo the request one sector at a time
		 * in order to accurately determine which sectors can be read
		 * successfully.
		 */
		if (disable_multi && brq.data.blocks > 1)
			brq.data.blocks = 1;

		if (brq.data.blocks > 1 || do_rel_wr) {
			/* SPI multiblock writes terminate using a special
			 * token, not a STOP_TRANSMISSION request. Reliable
			 * writes use SET_BLOCK_COUNT and do not use a
			 * STOP_TRANSMISSION request either.
			 */
			if ((!mmc_host_is_spi(card->host) && !do_rel_wr) ||
			    rq_data_dir(req) == READ)
				brq.mrq.stop = &brq.stop;
			readcmd = MMC_READ_MULTIPLE_BLOCK;
			writecmd = MMC_WRITE_MULTIPLE_BLOCK;
		} else {
			brq.mrq.stop = NULL;
			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;
		}

		if (do_rel_wr && mmc_apply_rel_rw(&brq, card, req))
			goto cmd_err;

		mmc_set_data_timeout(&brq.data, card);

		brq.data.sg = mq->sg;
		brq.data.sg_len = mmc_queue_map_sg(mq);

		/*
		 * Adjust the sg list so it is the same size as the
		 * request.
		 */
		if (brq.data.blocks != blk_rq_sectors(req)) {
			int i, data_size = brq.data.blocks << 9;
			struct scatterlist *sg;

			for_each_sg(brq.data.sg, sg, brq.data.sg_len, i) {
				data_size -= sg->length;
				if (data_size <= 0) {
					sg->length += data_size;
					i++;
					break;
				}
			}
			brq.data.sg_len = i;
		}

		mmc_queue_bounce_pre(mq);

		mmc_wait_for_req(card->host, &brq.mrq);

		mmc_queue_bounce_post(mq);

		/*
		 * 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.
		 */
		if (brq.cmd.error || brq.data.error || brq.stop.error) {
			if (brq.data.blocks > 1 && rq_data_dir(req) == READ) {
				/* Redo read one sector at a time */
				printk(KERN_WARNING "%s: retrying using single "
				       "block read\n", req->rq_disk->disk_name);
				disable_multi = 1;
				continue;
			}
			status = get_card_status(card, req);
		}

		if (brq.cmd.error) {
			printk(KERN_ERR "%s: error %d sending read/write "
			       "command, response %#x, card status %#x\n",
			       req->rq_disk->disk_name, brq.cmd.error,
			       brq.cmd.resp[0], status);
		}

		if (brq.data.error) {
			if (brq.data.error == -ETIMEDOUT && brq.mrq.stop)
				/* 'Stop' response contains card status */
				status = brq.mrq.stop->resp[0];
			printk(KERN_ERR "%s: error %d transferring data,"
			       " sector %u, nr %u, card status %#x\n",
			       req->rq_disk->disk_name, brq.data.error,
			       (unsigned)blk_rq_pos(req),
			       (unsigned)blk_rq_sectors(req), status);
		}

		if (brq.stop.error) {
			printk(KERN_ERR "%s: error %d sending stop command, "
			       "response %#x, card status %#x\n",
			       req->rq_disk->disk_name, brq.stop.error,
			       brq.stop.resp[0], status);
		}

		if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
			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;
				}
				/*
				 * 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));

#if 0
			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;
#endif
		}

		if (brq.cmd.error || brq.stop.error || brq.data.error) {
			if (rq_data_dir(req) == READ) {
				/*
				 * After an error, we redo I/O one sector at a
				 * time, so we only reach here after trying to
				 * read a single sector.
				 */
				spin_lock_irq(&md->lock);
				ret = __blk_end_request(req, -EIO, brq.data.blksz);
				spin_unlock_irq(&md->lock);
				continue;
			}
			goto cmd_err;
		}

		/*
		 * A block was successfully transferred.
		 */
		spin_lock_irq(&md->lock);
		ret = __blk_end_request(req, 0, brq.data.bytes_xfered);
		spin_unlock_irq(&md->lock);
	} while (ret);

	return 1;

 cmd_err:
 	/*
 	 * 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
	 * as reported by the controller (which might be less than
	 * the real number of written sectors, but never more).
	 */
	if (mmc_card_sd(card)) {
		u32 blocks;

		blocks = mmc_sd_num_wr_blocks(card);
		if (blocks != (u32)-1) {
			spin_lock_irq(&md->lock);
			ret = __blk_end_request(req, 0, blocks << 9);
			spin_unlock_irq(&md->lock);
		}
	} else {
		spin_lock_irq(&md->lock);
		ret = __blk_end_request(req, 0, brq.data.bytes_xfered);
		spin_unlock_irq(&md->lock);
	}

	spin_lock_irq(&md->lock);
	while (ret)
		ret = __blk_end_request(req, -EIO, blk_rq_cur_bytes(req));
	spin_unlock_irq(&md->lock);

	return 0;
}

static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
{
	int ret;
	struct mmc_blk_data *md = mq->data;
	struct mmc_card *card = md->queue.card;

	mmc_claim_host(card->host);
	ret = mmc_blk_part_switch(card, md);
	if (ret) {
		ret = 0;
		goto out;
	}

	if (req->cmd_flags & REQ_DISCARD) {
		if (req->cmd_flags & REQ_SECURE)
			ret = mmc_blk_issue_secdiscard_rq(mq, req);
		else
			ret = mmc_blk_issue_discard_rq(mq, req);
	} else if (req->cmd_flags & REQ_FLUSH) {
		ret = mmc_blk_issue_flush(mq, req);
	} else {
		ret = mmc_blk_issue_rw_rq(mq, req);
	}

out:
	mmc_release_host(card->host);
	return ret;
}

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

static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
					      struct device *parent,
					      sector_t size,
					      bool default_ro,
					      const char *subname)
{
	struct mmc_blk_data *md;
	int devidx, ret;

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

	md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
	if (!md) {
		ret = -ENOMEM;
		goto out;
	}

	/*
	 * Set the read-only status based on the supported commands
	 * and the write protect switch.
	 */
	md->read_only = mmc_blk_readonly(card);

	md->disk = alloc_disk(perdev_minors);
	if (md->disk == NULL) {
		ret = -ENOMEM;
		goto err_kfree;
	}

	spin_lock_init(&md->lock);
	INIT_LIST_HEAD(&md->part);
	md->usage = 1;

	ret = mmc_init_queue(&md->queue, card, &md->lock);
	if (ret)
		goto err_putdisk;

	md->queue.issue_fn = mmc_blk_issue_rq;
	md->queue.data = md;

	md->disk->major	= MMC_BLOCK_MAJOR;
	md->disk->first_minor = devidx * perdev_minors;
	md->disk->fops = &mmc_bdops;
	md->disk->private_data = md;
	md->disk->queue = md->queue.queue;
	md->disk->driverfs_dev = parent;
	set_disk_ro(md->disk, md->read_only || default_ro);
	if (REL_WRITES_SUPPORTED(card))
		blk_queue_flush(md->queue.queue, REQ_FLUSH | REQ_FUA);

	/*
	 * 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.
	 */

	if (subname)
		snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
			 "mmcblk%d%s",
			 mmc_get_devidx(dev_to_disk(parent)), subname);
	else
		snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
			 "mmcblk%d", devidx);

	blk_queue_logical_block_size(md->queue.queue, 512);
	set_capacity(md->disk, size);
	return md;

 err_putdisk:
	put_disk(md->disk);
 err_kfree:
	kfree(md);
 out:
	return ERR_PTR(ret);
}

static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
{
	sector_t size;
	struct mmc_blk_data *md;

	if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
		/*
		 * The EXT_CSD sector count is in number or 512 byte
		 * sectors.
		 */
		size = card->ext_csd.sectors;
	} else {
		/*
		 * The CSD capacity field is in units of read_blkbits.
		 * set_capacity takes units of 512 bytes.
		 */
		size = card->csd.capacity << (card->csd.read_blkbits - 9);
	}

	md = mmc_blk_alloc_req(card, &card->dev, size, false, NULL);
	return md;
}

static int mmc_blk_alloc_part(struct mmc_card *card,
			      struct mmc_blk_data *md,
			      unsigned int part_type,
			      sector_t size,
			      bool default_ro,
			      const char *subname)
{
	char cap_str[10];
	struct mmc_blk_data *part_md;

	part_md = mmc_blk_alloc_req(card, disk_to_dev(md->disk), size, default_ro,
				    subname);
	if (IS_ERR(part_md))
		return PTR_ERR(part_md);
	part_md->part_type = part_type;
	list_add(&part_md->part, &md->part);

	string_get_size((u64)get_capacity(part_md->disk) << 9, STRING_UNITS_2,
			cap_str, sizeof(cap_str));
	printk(KERN_INFO "%s: %s %s partition %u %s\n",
	       part_md->disk->disk_name, mmc_card_id(card),
	       mmc_card_name(card), part_md->part_type, cap_str);
	return 0;
}

static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md)
{
	int ret = 0;

	if (!mmc_card_mmc(card))
		return 0;

	if (card->ext_csd.boot_size) {
		ret = mmc_blk_alloc_part(card, md, EXT_CSD_PART_CONFIG_ACC_BOOT0,
					 card->ext_csd.boot_size >> 9,
					 true,
					 "boot0");
		if (ret)
			return ret;
		ret = mmc_blk_alloc_part(card, md, EXT_CSD_PART_CONFIG_ACC_BOOT1,
					 card->ext_csd.boot_size >> 9,
					 true,
					 "boot1");
		if (ret)
			return ret;
	}

	return ret;
}

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

	mmc_claim_host(card->host);
	err = mmc_set_blocklen(card, 512);
	mmc_release_host(card->host);

	if (err) {
		printk(KERN_ERR "%s: unable to set block size to 512: %d\n",
			md->disk->disk_name, err);
		return -EINVAL;
	}

	return 0;
}

static void mmc_blk_remove_req(struct mmc_blk_data *md)
{
	if (md) {
		if (md->disk->flags & GENHD_FL_UP) {
			device_remove_file(disk_to_dev(md->disk), &md->force_ro);

			/* Stop new requests from getting into the queue */
			del_gendisk(md->disk);
		}

		/* Then flush out any already in there */
		mmc_cleanup_queue(&md->queue);
		mmc_blk_put(md);
	}
}

static void mmc_blk_remove_parts(struct mmc_card *card,
				 struct mmc_blk_data *md)
{
	struct list_head *pos, *q;
	struct mmc_blk_data *part_md;

	list_for_each_safe(pos, q, &md->part) {
		part_md = list_entry(pos, struct mmc_blk_data, part);
		list_del(pos);
		mmc_blk_remove_req(part_md);
	}
}

static int mmc_add_disk(struct mmc_blk_data *md)
{
	int ret;

	add_disk(md->disk);
	md->force_ro.show = force_ro_show;
	md->force_ro.store = force_ro_store;
	md->force_ro.attr.name = "force_ro";
	md->force_ro.attr.mode = S_IRUGO | S_IWUSR;
	ret = device_create_file(disk_to_dev(md->disk), &md->force_ro);
	if (ret)
		del_gendisk(md->disk);

	return ret;
}

static const struct mmc_fixup blk_fixups[] =
{
	MMC_FIXUP("SEM02G", 0x2, 0x100, add_quirk, MMC_QUIRK_INAND_CMD38),
	MMC_FIXUP("SEM04G", 0x2, 0x100, add_quirk, MMC_QUIRK_INAND_CMD38),
	MMC_FIXUP("SEM08G", 0x2, 0x100, add_quirk, MMC_QUIRK_INAND_CMD38),
	MMC_FIXUP("SEM16G", 0x2, 0x100, add_quirk, MMC_QUIRK_INAND_CMD38),
	MMC_FIXUP("SEM32G", 0x2, 0x100, add_quirk, MMC_QUIRK_INAND_CMD38),
	END_FIXUP
};

static int mmc_blk_probe(struct mmc_card *card)
{
	struct mmc_blk_data *md, *part_md;
	int err;
	char cap_str[10];

	/*
	 * Check that the card supports the command class(es) we need.
	 */
	if (!(card->csd.cmdclass & CCC_BLOCK_READ))
		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;

	string_get_size((u64)get_capacity(md->disk) << 9, STRING_UNITS_2,
			cap_str, sizeof(cap_str));
	printk(KERN_INFO "%s: %s %s %s %s\n",
		md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
		cap_str, md->read_only ? "(ro)" : "");

	if (mmc_blk_alloc_parts(card, md))
		goto out;

	mmc_set_drvdata(card, md);
	mmc_fixup_device(card, blk_fixups);

	if (mmc_add_disk(md))
		goto out;

	list_for_each_entry(part_md, &md->part, part) {
		if (mmc_add_disk(part_md))
			goto out;
	}
	return 0;

 out:
	mmc_blk_remove_parts(card, md);
	mmc_blk_remove_req(md);
	return err;
}

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

	mmc_blk_remove_parts(card, md);
	mmc_blk_remove_req(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 *part_md;
	struct mmc_blk_data *md = mmc_get_drvdata(card);

	if (md) {
		mmc_queue_suspend(&md->queue);
		list_for_each_entry(part_md, &md->part, part) {
			mmc_queue_suspend(&part_md->queue);
		}
	}
	return 0;
}

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

	if (md) {
		mmc_blk_set_blksize(md, card);

		/*
		 * Resume involves the card going into idle state,
		 * so current partition is always the main one.
		 */
		md->part_curr = md->part_type;
		mmc_queue_resume(&md->queue);
		list_for_each_entry(part_md, &md->part, part) {
			mmc_queue_resume(&part_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;

	if (perdev_minors != CONFIG_MMC_BLOCK_MINORS)
		pr_info("mmcblk: using %d minors per device\n", perdev_minors);

	max_devices = 256 / perdev_minors;

	res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
	if (res)
		goto out;

	res = mmc_register_driver(&mmc_driver);
	if (res)
		goto out2;

	return 0;
 out2:
	unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
 out:
	return res;
}

static void __exit mmc_blk_exit(void)
{
	mmc_unregister_driver(&mmc_driver);
	unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
}

module_init(mmc_blk_init);
module_exit(mmc_blk_exit);

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