mmc: Move queue functions to mmc_block

The mmc block queue functions are tailored for the mmc_block
driver, so move those functions into that module.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

1 files changed, 0 insertions, 667 deletions

diff --git a/drivers/mmc/mmc_block.c b/drivers/mmc/mmc_block.c
deleted file mode 100644
index 63fbde8756aca..0000000000000
--- a/drivers/mmc/mmc_block.c
+++ /dev/null
@@ -1,667 +0,0 @@
-/*
- * 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, sg_pos, data_size;
-
-	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);
-
-		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;
-		}
-
-		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);
-
-	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));
-	}
-	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");