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authorPierre Ossman <drzeus@drzeus.cx>2006-12-23 20:03:02 +0100
committerPierre Ossman <drzeus@drzeus.cx>2007-05-01 13:04:16 +0200
commit98ac2162699f7e9880683cb954891817f20b607c (patch)
tree27452d428e16edfe6d13d71f297adf5376d07bde /drivers/mmc/mmc_block.c
parent29041dbe199b0dff392bf1b9d634357da0b3208f (diff)
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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>
Diffstat (limited to 'drivers/mmc/mmc_block.c')
-rw-r--r--drivers/mmc/mmc_block.c667
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 63fbde8756ac..000000000000
--- 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");