[net-next-2.6.git] / drivers / mmc / mmc_block.c

/*
 * Block driver for media (i.e., flash cards)
 *
 * Copyright 2002 Hewlett-Packard Company
 *
 * 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>
#include <linux/mutex.h>
#include <linux/scatterlist.h>

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

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

#include "mmc_queue.h"

/*
 * max 8 partitions per card
 */
#define MMC_SHIFT	3

static int major;

/*
 * 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;
	unsigned int	read_only;
};

static DEFINE_MUTEX(open_lock);

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 void mmc_blk_put(struct mmc_blk_data *md)
{
	mutex_lock(&open_lock);
	md->usage--;
	if (md->usage == 0) {
		put_disk(md->disk);
		kfree(md);
	}
	mutex_unlock(&open_lock);
}

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;

		if ((filp->f_mode & FMODE_WRITE) && md->read_only)
			ret = -EROFS;
	}

	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
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 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 int mmc_blk_prep_rq(struct mmc_queue *mq, struct request *req)
{
	struct mmc_blk_data *md = mq->data;
	int stat = BLKPREP_OK;

	/*
	 * If we have no device, we haven't finished initialising.
	 */
	if (!md || !mq->card) {
		printk(KERN_ERR "%s: killing request - no device/host\n",
		       req->rq_disk->disk_name);
		stat = BLKPREP_KILL;
	}

	return stat;
}

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;
	cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;

	err = mmc_wait_for_cmd(card->host, &cmd, 0);
	if ((err != MMC_ERR_NONE) || !(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_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;

	sg_init_one(&sg, &blocks, 4);

	mmc_wait_for_req(card->host, &mrq);

	if (cmd.error != MMC_ERR_NONE || data.error != MMC_ERR_NONE)
		return (u32)-1;

	blocks = ntohl(blocks);

	return blocks;
}

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;
	struct mmc_blk_request brq;
	int ret = 1;

	if (mmc_card_claim_host(card))
		goto flush_queue;

	do {
		struct mmc_command cmd;
		u32 readcmd, writecmd;

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

		brq.cmd.arg = req->sector;
		if (!mmc_card_blockaddr(card))
			brq.cmd.arg <<= 9;
		brq.cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
		brq.data.blksz = 1 << md->block_bits;
		brq.stop.opcode = MMC_STOP_TRANSMISSION;
		brq.stop.arg = 0;
		brq.stop.flags = MMC_RSP_R1B | MMC_CMD_AC;
		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;

		mmc_set_data_timeout(&brq.data, card, rq_data_dir(req) != READ);

		/*
		 * If the host doesn't support multiple block writes, force
		 * block writes to single block. SD cards are excepted from
		 * this rule as they support querying the number of
		 * successfully written sectors.
		 */
		if (rq_data_dir(req) != READ &&
		    !(card->host->caps & MMC_CAP_MULTIWRITE) &&
		    !mmc_card_sd(card))
			brq.data.blocks = 1;

		if (brq.data.blocks > 1) {
			brq.data.flags |= MMC_DATA_MULTI;
			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;
		}

		brq.data.sg = mq->sg;
		brq.data.sg_len = blk_rq_map_sg(req->q, req, brq.data.sg);

		mmc_wait_for_req(card->host, &brq.mrq);
		if (brq.cmd.error) {
			printk(KERN_ERR "%s: error %d sending read/write command\n",
			       req->rq_disk->disk_name, brq.cmd.error);
			goto cmd_err;
		}

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

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

		if (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;
				}
			} while (!(cmd.resp[0] & R1_READY_FOR_DATA));

#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
		}

		/*
		 * A block was successfully transferred.
		 */
		spin_lock_irq(&md->lock);
		ret = end_that_request_chunk(req, 1, brq.data.bytes_xfered);
		if (!ret) {
			/*
			 * The whole request completed successfully.
			 */
			add_disk_randomness(req->rq_disk);
			blkdev_dequeue_request(req);
			end_that_request_last(req, 1);
		}
		spin_unlock_irq(&md->lock);
	} while (ret);

	mmc_card_release_host(card);

	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
	 * if the controller can do proper error reporting.
	 *
	 * For reads we just fail the entire chunk as that should
	 * be safe in all cases.
	 */
 	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);
			ret = end_that_request_chunk(req, 1, bytes);
			spin_unlock_irq(&md->lock);
		}
	} else if (rq_data_dir(req) != READ &&
		   (card->host->caps & MMC_CAP_MULTIWRITE)) {
		spin_lock_irq(&md->lock);
		ret = end_that_request_chunk(req, 1, brq.data.bytes_xfered);
		spin_unlock_irq(&md->lock);
	}

flush_queue:

	mmc_card_release_host(card);

	spin_lock_irq(&md->lock);
	while (ret) {
		ret = end_that_request_chunk(req, 0,
				req->current_nr_sectors << 9);
	}

	add_disk_randomness(req->rq_disk);
	blkdev_dequeue_request(req);
	end_that_request_last(req, 0);
	spin_unlock_irq(&md->lock);

	return 0;
}

#define MMC_NUM_MINORS	(256 >> MMC_SHIFT)

static unsigned long dev_use[MMC_NUM_MINORS/(8*sizeof(unsigned long))];

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(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);

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

	memset(md, 0, sizeof(struct mmc_blk_data));

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

	/*
	 * 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.
	 */
	md->block_bits = 9;

	md->disk = alloc_disk(1 << MMC_SHIFT);
	if (md->disk == NULL) {
		ret = -ENOMEM;
		goto err_kfree;
	}

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

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

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

	md->disk->major	= major;
	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);

	/*
	 * 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));
	return md;

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

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

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

	mmc_card_claim_host(card);
	cmd.opcode = MMC_SET_BLOCKLEN;
	cmd.arg = 1 << md->block_bits;
	cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
	err = mmc_wait_for_cmd(card->host, &cmd, 5);
	mmc_card_release_host(card);

	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;

	/*
	 * 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;

	printk(KERN_INFO "%s: %s %s %lluKiB %s\n",
		md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
		(unsigned long long)(get_capacity(md->disk) >> 1),
		md->read_only ? "(ro)" : "");

	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) {
		int devidx;

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

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

		devidx = md->disk->first_minor >> MMC_SHIFT;
		__clear_bit(devidx, dev_use);

		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;

	res = register_blkdev(major, "mmc");
	if (res < 0) {
		printk(KERN_WARNING "Unable to get major %d for MMC media: %d\n",
		       major, res);
		goto out;
	}
	if (major == 0)
		major = res;

	return mmc_register_driver(&mmc_driver);

 out:
	return res;
}

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

module_init(mmc_blk_init);
module_exit(mmc_blk_exit);

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

module_param(major, int, 0444);
MODULE_PARM_DESC(major, "specify the major device number for MMC block driver");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Block driver for media (i.e., flash cards)
	3	*
	4	* Copyright 2002 Hewlett-Packard Company
	5	*
	6	* Use consistent with the GNU GPL is permitted,
	7	* provided that this copyright notice is
	8	* preserved in its entirety in all copies and derived works.
	9	*
	10	* HEWLETT-PACKARD COMPANY MAKES NO WARRANTIES, EXPRESSED OR IMPLIED,
	11	* AS TO THE USEFULNESS OR CORRECTNESS OF THIS CODE OR ITS
	12	* FITNESS FOR ANY PARTICULAR PURPOSE.
	13	*
	14	* Many thanks to Alessandro Rubini and Jonathan Corbet!
	15	*
	16	* Author: Andrew Christian
	17	* 28 May 2002
	18	*/
	19	#include <linux/moduleparam.h>
	20	#include <linux/module.h>
	21	#include <linux/init.h>
	22
1da177e4 LT	23	#include <linux/kernel.h>
	24	#include <linux/fs.h>
	25	#include <linux/errno.h>
	26	#include <linux/hdreg.h>
	27	#include <linux/kdev_t.h>
	28	#include <linux/blkdev.h>
a621aaed	29	#include <linux/mutex.h>
ec5a19dd	30	#include <linux/scatterlist.h>
1da177e4 LT	31
1da177e4 LT	32	#include <linux/mmc/card.h>
385e3227	33	#include <linux/mmc/host.h>
1da177e4	34	#include <linux/mmc/protocol.h>
db53f28b	35	#include <linux/mmc/host.h>
1da177e4 LT	36
	37	#include <asm/system.h>
	38	#include <asm/uaccess.h>
	39
	40	#include "mmc_queue.h"
	41
	42	/*
	43	* max 8 partitions per card
	44	*/
	45	#define MMC_SHIFT 3
	46
	47	static int major;
	48
	49	/*
	50	* There is one mmc_blk_data per slot.
	51	*/
	52	struct mmc_blk_data {
	53	spinlock_t lock;
	54	struct gendisk *disk;
	55	struct mmc_queue queue;
	56
	57	unsigned int usage;
	58	unsigned int block_bits;
a6f6c96b	59	unsigned int read_only;
1da177e4 LT	60	};
1da177e4 LT	61
a621aaed	62	static DEFINE_MUTEX(open_lock);
1da177e4 LT	63
	64	static struct mmc_blk_data mmc_blk_get(struct gendisk disk)
	65	{
	66	struct mmc_blk_data *md;
	67
a621aaed	68	mutex_lock(&open_lock);
1da177e4 LT	69	md = disk->private_data;
	70	if (md && md->usage == 0)
	71	md = NULL;
	72	if (md)
	73	md->usage++;
a621aaed	74	mutex_unlock(&open_lock);
1da177e4 LT	75
	76	return md;
	77	}
	78
	79	static void mmc_blk_put(struct mmc_blk_data *md)
	80	{
a621aaed	81	mutex_lock(&open_lock);
1da177e4 LT	82	md->usage--;
	83	if (md->usage == 0) {
	84	put_disk(md->disk);
1da177e4 LT	85	kfree(md);
1da177e4 LT	86	}
a621aaed	87	mutex_unlock(&open_lock);
1da177e4 LT	88	}
	89
	90	static int mmc_blk_open(struct inode inode, struct file filp)
	91	{
	92	struct mmc_blk_data *md;
	93	int ret = -ENXIO;
	94
	95	md = mmc_blk_get(inode->i_bdev->bd_disk);
	96	if (md) {
	97	if (md->usage == 2)
	98	check_disk_change(inode->i_bdev);
	99	ret = 0;
a00fc090	100
a6f6c96b	101	if ((filp->f_mode & FMODE_WRITE) && md->read_only)
a00fc090	102	ret = -EROFS;
1da177e4 LT	103	}
	104
	105	return ret;
	106	}
	107
	108	static int mmc_blk_release(struct inode inode, struct file filp)
	109	{
	110	struct mmc_blk_data *md = inode->i_bdev->bd_disk->private_data;
	111
	112	mmc_blk_put(md);
	113	return 0;
	114	}
	115
	116	static int
a885c8c4	117	mmc_blk_getgeo(struct block_device bdev, struct hd_geometry geo)
1da177e4	118	{
a885c8c4 CH	119	geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
	120	geo->heads = 4;
	121	geo->sectors = 16;
	122	return 0;
1da177e4 LT	123	}
	124
	125	static struct block_device_operations mmc_bdops = {
	126	.open = mmc_blk_open,
	127	.release = mmc_blk_release,
a885c8c4	128	.getgeo = mmc_blk_getgeo,
1da177e4 LT	129	.owner = THIS_MODULE,
	130	};
	131
	132	struct mmc_blk_request {
	133	struct mmc_request mrq;
	134	struct mmc_command cmd;
	135	struct mmc_command stop;
	136	struct mmc_data data;
	137	};
	138
	139	static int mmc_blk_prep_rq(struct mmc_queue mq, struct request req)
	140	{
	141	struct mmc_blk_data *md = mq->data;
	142	int stat = BLKPREP_OK;
	143
	144	/*
	145	* If we have no device, we haven't finished initialising.
	146	*/
	147	if (!md \|\| !mq->card) {
	148	printk(KERN_ERR "%s: killing request - no device/host\n",
	149	req->rq_disk->disk_name);
	150	stat = BLKPREP_KILL;
	151	}
	152
	153	return stat;
	154	}
	155
ec5a19dd PO	156	static u32 mmc_sd_num_wr_blocks(struct mmc_card *card)
	157	{
	158	int err;
	159	u32 blocks;
	160
	161	struct mmc_request mrq;
	162	struct mmc_command cmd;
	163	struct mmc_data data;
	164	unsigned int timeout_us;
	165
	166	struct scatterlist sg;
	167
	168	memset(&cmd, 0, sizeof(struct mmc_command));
	169
	170	cmd.opcode = MMC_APP_CMD;
	171	cmd.arg = card->rca << 16;
	172	cmd.flags = MMC_RSP_R1 \| MMC_CMD_AC;
	173
	174	err = mmc_wait_for_cmd(card->host, &cmd, 0);
	175	if ((err != MMC_ERR_NONE) \|\| !(cmd.resp[0] & R1_APP_CMD))
	176	return (u32)-1;
	177
	178	memset(&cmd, 0, sizeof(struct mmc_command));
	179
	180	cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
	181	cmd.arg = 0;
	182	cmd.flags = MMC_RSP_R1 \| MMC_CMD_ADTC;
	183
	184	memset(&data, 0, sizeof(struct mmc_data));
	185
	186	data.timeout_ns = card->csd.tacc_ns * 100;
	187	data.timeout_clks = card->csd.tacc_clks * 100;
	188
	189	timeout_us = data.timeout_ns / 1000;
	190	timeout_us += data.timeout_clks * 1000 /
	191	(card->host->ios.clock / 1000);
	192
	193	if (timeout_us > 100000) {
	194	data.timeout_ns = 100000000;
	195	data.timeout_clks = 0;
	196	}
	197
	198	data.blksz = 4;
	199	data.blocks = 1;
	200	data.flags = MMC_DATA_READ;
	201	data.sg = &sg;
	202	data.sg_len = 1;
	203
	204	memset(&mrq, 0, sizeof(struct mmc_request));
	205
	206	mrq.cmd = &cmd;
	207	mrq.data = &data;
	208
	209	sg_init_one(&sg, &blocks, 4);
	210
	211	mmc_wait_for_req(card->host, &mrq);
	212
	213	if (cmd.error != MMC_ERR_NONE \|\| data.error != MMC_ERR_NONE)
	214	return (u32)-1;
	215
	216	blocks = ntohl(blocks);
	217
	218	return blocks;
	219	}
220
1da177e4 LT	221	static int mmc_blk_issue_rq(struct mmc_queue mq, struct request req)
	222	{
	223	struct mmc_blk_data *md = mq->data;
	224	struct mmc_card *card = md->queue.card;
176f00ff	225	struct mmc_blk_request brq;
8b7feff8	226	int ret = 1;
1da177e4 LT	227
1da177e4 LT	228	if (mmc_card_claim_host(card))
8b7feff8	229	goto flush_queue;
1da177e4 LT	230
1da177e4 LT	231	do {
1da177e4	232	struct mmc_command cmd;
db53f28b	233	u32 readcmd, writecmd;
1da177e4 LT	234
	235	memset(&brq, 0, sizeof(struct mmc_blk_request));
	236	brq.mrq.cmd = &brq.cmd;
	237	brq.mrq.data = &brq.data;
	238
fba68bd2 PL	239	brq.cmd.arg = req->sector;
	240	if (!mmc_card_blockaddr(card))
	241	brq.cmd.arg <<= 9;
e9225176	242	brq.cmd.flags = MMC_RSP_R1 \| MMC_CMD_ADTC;
2c171bf1	243	brq.data.blksz = 1 << md->block_bits;
1da177e4 LT	244	brq.stop.opcode = MMC_STOP_TRANSMISSION;
1da177e4 LT	245	brq.stop.arg = 0;
e9225176	246	brq.stop.flags = MMC_RSP_R1B \| MMC_CMD_AC;
55db890a PO	247	brq.data.blocks = req->nr_sectors >> (md->block_bits - 9);
	248	if (brq.data.blocks > card->host->max_blk_count)
	249	brq.data.blocks = card->host->max_blk_count;
1da177e4	250
d773d725	251	mmc_set_data_timeout(&brq.data, card, rq_data_dir(req) != READ);
385e3227	252
db53f28b RK	253	/*
db53f28b RK	254	* If the host doesn't support multiple block writes, force
ec5a19dd PO	255	* block writes to single block. SD cards are excepted from
	256	* this rule as they support querying the number of
	257	* successfully written sectors.
db53f28b RK	258	*/
db53f28b RK	259	if (rq_data_dir(req) != READ &&
ec5a19dd PO	260	!(card->host->caps & MMC_CAP_MULTIWRITE) &&
ec5a19dd PO	261	!mmc_card_sd(card))
1da177e4	262	brq.data.blocks = 1;
788ee7b0 RK	263
	264	if (brq.data.blocks > 1) {
	265	brq.data.flags \|= MMC_DATA_MULTI;
	266	brq.mrq.stop = &brq.stop;
db53f28b RK	267	readcmd = MMC_READ_MULTIPLE_BLOCK;
db53f28b RK	268	writecmd = MMC_WRITE_MULTIPLE_BLOCK;
788ee7b0 RK	269	} else {
788ee7b0 RK	270	brq.mrq.stop = NULL;
db53f28b RK	271	readcmd = MMC_READ_SINGLE_BLOCK;
	272	writecmd = MMC_WRITE_BLOCK;
	273	}
	274
	275	if (rq_data_dir(req) == READ) {
	276	brq.cmd.opcode = readcmd;
	277	brq.data.flags \|= MMC_DATA_READ;
	278	} else {
	279	brq.cmd.opcode = writecmd;
	280	brq.data.flags \|= MMC_DATA_WRITE;
788ee7b0	281	}
1da177e4 LT	282
	283	brq.data.sg = mq->sg;
	284	brq.data.sg_len = blk_rq_map_sg(req->q, req, brq.data.sg);
	285
	286	mmc_wait_for_req(card->host, &brq.mrq);
	287	if (brq.cmd.error) {
	288	printk(KERN_ERR "%s: error %d sending read/write command\n",
	289	req->rq_disk->disk_name, brq.cmd.error);
	290	goto cmd_err;
	291	}
	292
	293	if (brq.data.error) {
	294	printk(KERN_ERR "%s: error %d transferring data\n",
	295	req->rq_disk->disk_name, brq.data.error);
	296	goto cmd_err;
	297	}
	298
	299	if (brq.stop.error) {
	300	printk(KERN_ERR "%s: error %d sending stop command\n",
	301	req->rq_disk->disk_name, brq.stop.error);
	302	goto cmd_err;
	303	}
	304
2ed6d22c RK	305	if (rq_data_dir(req) != READ) {
	306	do {
	307	int err;
	308
	309	cmd.opcode = MMC_SEND_STATUS;
	310	cmd.arg = card->rca << 16;
	311	cmd.flags = MMC_RSP_R1 \| MMC_CMD_AC;
	312	err = mmc_wait_for_cmd(card->host, &cmd, 5);
	313	if (err) {
	314	printk(KERN_ERR "%s: error %d requesting status\n",
	315	req->rq_disk->disk_name, err);
	316	goto cmd_err;
	317	}
	318	} while (!(cmd.resp[0] & R1_READY_FOR_DATA));
1da177e4 LT	319
1da177e4 LT	320	#if 0
2ed6d22c RK	321	if (cmd.resp[0] & ~0x00000900)
	322	printk(KERN_ERR "%s: status = %08x\n",
	323	req->rq_disk->disk_name, cmd.resp[0]);
	324	if (mmc_decode_status(cmd.resp))
	325	goto cmd_err;
1da177e4	326	#endif
2ed6d22c	327	}
1da177e4 LT	328
	329	/*
	330	* A block was successfully transferred.
	331	*/
	332	spin_lock_irq(&md->lock);
	333	ret = end_that_request_chunk(req, 1, brq.data.bytes_xfered);
	334	if (!ret) {
	335	/*
	336	* The whole request completed successfully.
	337	*/
	338	add_disk_randomness(req->rq_disk);
	339	blkdev_dequeue_request(req);
8ffdc655	340	end_that_request_last(req, 1);
1da177e4 LT	341	}
	342	spin_unlock_irq(&md->lock);
	343	} while (ret);
	344
	345	mmc_card_release_host(card);
	346
	347	return 1;
	348
	349	cmd_err:
ec5a19dd PO	350	/*
	351	* If this is an SD card and we're writing, we can first
	352	* mark the known good sectors as ok.
	353	*
	354	* If the card is not SD, we can still ok written sectors
	355	* if the controller can do proper error reporting.
176f00ff PO	356	*
	357	* For reads we just fail the entire chunk as that should
	358	* be safe in all cases.
1da177e4	359	*/
ec5a19dd PO	360	if (rq_data_dir(req) != READ && mmc_card_sd(card)) {
	361	u32 blocks;
	362	unsigned int bytes;
	363
	364	blocks = mmc_sd_num_wr_blocks(card);
	365	if (blocks != (u32)-1) {
	366	if (card->csd.write_partial)
	367	bytes = blocks << md->block_bits;
	368	else
	369	bytes = blocks << 9;
	370	spin_lock_irq(&md->lock);
	371	ret = end_that_request_chunk(req, 1, bytes);
	372	spin_unlock_irq(&md->lock);
	373	}
	374	} else if (rq_data_dir(req) != READ &&
	375	(card->host->caps & MMC_CAP_MULTIWRITE)) {
176f00ff PO	376	spin_lock_irq(&md->lock);
	377	ret = end_that_request_chunk(req, 1, brq.data.bytes_xfered);
	378	spin_unlock_irq(&md->lock);
	379	}
	380
397411e6 PO	381	flush_queue:
397411e6 PO	382
ec5a19dd PO	383	mmc_card_release_host(card);
ec5a19dd PO	384
1da177e4	385	spin_lock_irq(&md->lock);
176f00ff	386	while (ret) {
1da177e4 LT	387	ret = end_that_request_chunk(req, 0,
1da177e4 LT	388	req->current_nr_sectors << 9);
176f00ff	389	}
1da177e4 LT	390
	391	add_disk_randomness(req->rq_disk);
	392	blkdev_dequeue_request(req);
8ffdc655	393	end_that_request_last(req, 0);
1da177e4 LT	394	spin_unlock_irq(&md->lock);
	395
	396	return 0;
	397	}
	398
	399	#define MMC_NUM_MINORS (256 >> MMC_SHIFT)
	400
	401	static unsigned long dev_use[MMC_NUM_MINORS/(8*sizeof(unsigned long))];
	402
a6f6c96b RK	403	static inline int mmc_blk_readonly(struct mmc_card *card)
	404	{
	405	return mmc_card_readonly(card) \|\|
	406	!(card->csd.cmdclass & CCC_BLOCK_WRITE);
	407	}
	408
1da177e4 LT	409	static struct mmc_blk_data mmc_blk_alloc(struct mmc_card card)
	410	{
	411	struct mmc_blk_data *md;
	412	int devidx, ret;
	413
	414	devidx = find_first_zero_bit(dev_use, MMC_NUM_MINORS);
	415	if (devidx >= MMC_NUM_MINORS)
	416	return ERR_PTR(-ENOSPC);
	417	__set_bit(devidx, dev_use);
	418
	419	md = kmalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
a6f6c96b RK	420	if (!md) {
	421	ret = -ENOMEM;
	422	goto out;
	423	}
1da177e4	424
a6f6c96b	425	memset(md, 0, sizeof(struct mmc_blk_data));
1da177e4	426
a6f6c96b RK	427	/*
	428	* Set the read-only status based on the supported commands
	429	* and the write protect switch.
	430	*/
	431	md->read_only = mmc_blk_readonly(card);
1da177e4	432
a6f6c96b	433	/*
6fe9febb PO	434	* Both SD and MMC specifications state (although a bit
	435	* unclearly in the MMC case) that a block size of 512
	436	* bytes must always be supported by the card.
a6f6c96b	437	*/
6fe9febb	438	md->block_bits = 9;
1da177e4	439
a6f6c96b RK	440	md->disk = alloc_disk(1 << MMC_SHIFT);
	441	if (md->disk == NULL) {
	442	ret = -ENOMEM;
	443	goto err_kfree;
	444	}
1da177e4	445
a6f6c96b RK	446	spin_lock_init(&md->lock);
a6f6c96b RK	447	md->usage = 1;
1da177e4	448
a6f6c96b RK	449	ret = mmc_init_queue(&md->queue, card, &md->lock);
	450	if (ret)
	451	goto err_putdisk;
1da177e4	452
a6f6c96b RK	453	md->queue.prep_fn = mmc_blk_prep_rq;
	454	md->queue.issue_fn = mmc_blk_issue_rq;
	455	md->queue.data = md;
d2b18394	456
a6f6c96b RK	457	md->disk->major = major;
	458	md->disk->first_minor = devidx << MMC_SHIFT;
	459	md->disk->fops = &mmc_bdops;
	460	md->disk->private_data = md;
	461	md->disk->queue = md->queue.queue;
	462	md->disk->driverfs_dev = &card->dev;
	463
	464	/*
	465	* As discussed on lkml, GENHD_FL_REMOVABLE should:
	466	*
	467	* - be set for removable media with permanent block devices
	468	* - be unset for removable block devices with permanent media
	469	*
	470	* Since MMC block devices clearly fall under the second
	471	* case, we do not set GENHD_FL_REMOVABLE. Userspace
	472	* should use the block device creation/destruction hotplug
	473	* messages to tell when the card is present.
	474	*/
	475
	476	sprintf(md->disk->disk_name, "mmcblk%d", devidx);
a6f6c96b RK	477
	478	blk_queue_hardsect_size(md->queue.queue, 1 << md->block_bits);
	479
	480	/*
	481	* The CSD capacity field is in units of read_blkbits.
	482	* set_capacity takes units of 512 bytes.
	483	*/
	484	set_capacity(md->disk, card->csd.capacity << (card->csd.read_blkbits - 9));
1da177e4	485	return md;
a6f6c96b RK	486
	487	err_putdisk:
	488	put_disk(md->disk);
	489	err_kfree:
	490	kfree(md);
	491	out:
	492	return ERR_PTR(ret);
1da177e4 LT	493	}
	494
	495	static int
	496	mmc_blk_set_blksize(struct mmc_blk_data md, struct mmc_card card)
	497	{
	498	struct mmc_command cmd;
	499	int err;
	500
fba68bd2 PL	501	/* Block-addressed cards ignore MMC_SET_BLOCKLEN. */
	502	if (mmc_card_blockaddr(card))
	503	return 0;
	504
1da177e4 LT	505	mmc_card_claim_host(card);
1da177e4 LT	506	cmd.opcode = MMC_SET_BLOCKLEN;
d2b18394	507	cmd.arg = 1 << md->block_bits;
e9225176	508	cmd.flags = MMC_RSP_R1 \| MMC_CMD_AC;
1da177e4 LT	509	err = mmc_wait_for_cmd(card->host, &cmd, 5);
	510	mmc_card_release_host(card);
	511
	512	if (err) {
	513	printk(KERN_ERR "%s: unable to set block size to %d: %d\n",
	514	md->disk->disk_name, cmd.arg, err);
	515	return -EINVAL;
	516	}
	517
	518	return 0;
	519	}
	520
	521	static int mmc_blk_probe(struct mmc_card *card)
	522	{
	523	struct mmc_blk_data *md;
	524	int err;
	525
912490db PO	526	/*
	527	* Check that the card supports the command class(es) we need.
	528	*/
	529	if (!(card->csd.cmdclass & CCC_BLOCK_READ))
1da177e4 LT	530	return -ENODEV;
1da177e4 LT	531
1da177e4 LT	532	md = mmc_blk_alloc(card);
	533	if (IS_ERR(md))
	534	return PTR_ERR(md);
	535
	536	err = mmc_blk_set_blksize(md, card);
	537	if (err)
	538	goto out;
	539
51828abc	540	printk(KERN_INFO "%s: %s %s %lluKiB %s\n",
1da177e4	541	md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
51828abc AM	542	(unsigned long long)(get_capacity(md->disk) >> 1),
51828abc AM	543	md->read_only ? "(ro)" : "");
1da177e4 LT	544
	545	mmc_set_drvdata(card, md);
	546	add_disk(md->disk);
	547	return 0;
	548
	549	out:
	550	mmc_blk_put(md);
	551
	552	return err;
	553	}
	554
	555	static void mmc_blk_remove(struct mmc_card *card)
	556	{
	557	struct mmc_blk_data *md = mmc_get_drvdata(card);
	558
	559	if (md) {
	560	int devidx;
	561
89b4e133	562	/* Stop new requests from getting into the queue */
1da177e4 LT	563	del_gendisk(md->disk);
1da177e4 LT	564
89b4e133 PO	565	/* Then flush out any already in there */
89b4e133 PO	566	mmc_cleanup_queue(&md->queue);
1da177e4 LT	567
	568	devidx = md->disk->first_minor >> MMC_SHIFT;
	569	__clear_bit(devidx, dev_use);
	570
	571	mmc_blk_put(md);
	572	}
	573	mmc_set_drvdata(card, NULL);
	574	}
	575
	576	#ifdef CONFIG_PM
	577	static int mmc_blk_suspend(struct mmc_card *card, pm_message_t state)
	578	{
	579	struct mmc_blk_data *md = mmc_get_drvdata(card);
	580
	581	if (md) {
	582	mmc_queue_suspend(&md->queue);
	583	}
	584	return 0;
	585	}
	586
	587	static int mmc_blk_resume(struct mmc_card *card)
	588	{
	589	struct mmc_blk_data *md = mmc_get_drvdata(card);
	590
	591	if (md) {
	592	mmc_blk_set_blksize(md, card);
	593	mmc_queue_resume(&md->queue);
	594	}
	595	return 0;
	596	}
	597	#else
	598	#define mmc_blk_suspend NULL
	599	#define mmc_blk_resume NULL
	600	#endif
	601
	602	static struct mmc_driver mmc_driver = {
	603	.drv = {
	604	.name = "mmcblk",
	605	},
	606	.probe = mmc_blk_probe,
	607	.remove = mmc_blk_remove,
	608	.suspend = mmc_blk_suspend,
	609	.resume = mmc_blk_resume,
	610	};
	611
	612	static int __init mmc_blk_init(void)
	613	{
	614	int res = -ENOMEM;
	615
	616	res = register_blkdev(major, "mmc");
	617	if (res < 0) {
	618	printk(KERN_WARNING "Unable to get major %d for MMC media: %d\n",
	619	major, res);
	620	goto out;
	621	}
	622	if (major == 0)
	623	major = res;
	624
1da177e4 LT	625	return mmc_register_driver(&mmc_driver);
	626
	627	out:
	628	return res;
	629	}
	630
	631	static void __exit mmc_blk_exit(void)
	632	{
	633	mmc_unregister_driver(&mmc_driver);
1da177e4 LT	634	unregister_blkdev(major, "mmc");
	635	}
	636
	637	module_init(mmc_blk_init);
	638	module_exit(mmc_blk_exit);
	639
	640	MODULE_LICENSE("GPL");
	641	MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
	642
	643	module_param(major, int, 0444);
	644	MODULE_PARM_DESC(major, "specify the major device number for MMC block driver");