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path: root/drivers/mmc/mmc_block.c
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Diffstat (limited to 'drivers/mmc/mmc_block.c')
-rw-r--r--drivers/mmc/mmc_block.c130
1 files changed, 47 insertions, 83 deletions
diff --git a/drivers/mmc/mmc_block.c b/drivers/mmc/mmc_block.c
index 587458b370b..db0e8ad439a 100644
--- a/drivers/mmc/mmc_block.c
+++ b/drivers/mmc/mmc_block.c
@@ -27,11 +27,12 @@
#include <linux/hdreg.h>
#include <linux/kdev_t.h>
#include <linux/blkdev.h>
-#include <linux/devfs_fs_kernel.h>
#include <linux/mutex.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>
@@ -165,6 +166,7 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
do {
struct mmc_blk_request brq;
struct mmc_command cmd;
+ u32 readcmd, writecmd;
memset(&brq, 0, sizeof(struct mmc_blk_request));
brq.mrq.cmd = &brq.cmd;
@@ -172,35 +174,39 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
brq.cmd.arg = req->sector << 9;
brq.cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
- brq.data.timeout_ns = card->csd.tacc_ns * 10;
- brq.data.timeout_clks = card->csd.tacc_clks * 10;
- brq.data.blksz_bits = md->block_bits;
brq.data.blksz = 1 << md->block_bits;
brq.data.blocks = req->nr_sectors >> (md->block_bits - 9);
brq.stop.opcode = MMC_STOP_TRANSMISSION;
brq.stop.arg = 0;
brq.stop.flags = MMC_RSP_R1B | MMC_CMD_AC;
- if (rq_data_dir(req) == READ) {
- brq.cmd.opcode = brq.data.blocks > 1 ? MMC_READ_MULTIPLE_BLOCK : MMC_READ_SINGLE_BLOCK;
- brq.data.flags |= MMC_DATA_READ;
- } else {
- brq.cmd.opcode = MMC_WRITE_BLOCK;
- brq.data.flags |= MMC_DATA_WRITE;
- brq.data.blocks = 1;
+ mmc_set_data_timeout(&brq.data, card, rq_data_dir(req) != READ);
- /*
- * Scale up the timeout by the r2w factor
- */
- brq.data.timeout_ns <<= card->csd.r2w_factor;
- brq.data.timeout_clks <<= card->csd.r2w_factor;
- }
+ /*
+ * If the host doesn't support multiple block writes, force
+ * block writes to single block.
+ */
+ if (rq_data_dir(req) != READ &&
+ !(card->host->caps & MMC_CAP_MULTIWRITE))
+ 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;
@@ -225,27 +231,29 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
goto cmd_err;
}
- 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 (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;
+ 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.
@@ -325,52 +333,11 @@ static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
md->read_only = mmc_blk_readonly(card);
/*
- * Figure out a workable block size. MMC cards have:
- * - two block sizes, one for read and one for write.
- * - may support partial reads and/or writes
- * (allows block sizes smaller than specified)
- */
- md->block_bits = card->csd.read_blkbits;
- if (card->csd.write_blkbits != card->csd.read_blkbits) {
- if (card->csd.write_blkbits < card->csd.read_blkbits &&
- card->csd.read_partial) {
- /*
- * write block size is smaller than read block
- * size, but we support partial reads, so choose
- * the smaller write block size.
- */
- md->block_bits = card->csd.write_blkbits;
- } else if (card->csd.write_blkbits > card->csd.read_blkbits &&
- card->csd.write_partial) {
- /*
- * read block size is smaller than write block
- * size, but we support partial writes. Use read
- * block size.
- */
- } else {
- /*
- * We don't support this configuration for writes.
- */
- printk(KERN_ERR "%s: unable to select block size for "
- "writing (rb%u wb%u rp%u wp%u)\n",
- mmc_card_id(card),
- 1 << card->csd.read_blkbits,
- 1 << card->csd.write_blkbits,
- card->csd.read_partial,
- card->csd.write_partial);
- md->read_only = 1;
- }
- }
-
- /*
- * Refuse to allow block sizes smaller than 512 bytes.
+ * 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.
*/
- if (md->block_bits < 9) {
- printk(KERN_ERR "%s: unable to support block size %u\n",
- mmc_card_id(card), 1 << md->block_bits);
- ret = -EINVAL;
- goto err_kfree;
- }
+ md->block_bits = 9;
md->disk = alloc_disk(1 << MMC_SHIFT);
if (md->disk == NULL) {
@@ -409,7 +376,6 @@ static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
*/
sprintf(md->disk->disk_name, "mmcblk%d", devidx);
- sprintf(md->disk->devfs_name, "mmc/blk%d", devidx);
blk_queue_hardsect_size(md->queue.queue, 1 << md->block_bits);
@@ -555,7 +521,6 @@ static int __init mmc_blk_init(void)
if (major == 0)
major = res;
- devfs_mk_dir("mmc");
return mmc_register_driver(&mmc_driver);
out:
@@ -565,7 +530,6 @@ static int __init mmc_blk_init(void)
static void __exit mmc_blk_exit(void)
{
mmc_unregister_driver(&mmc_driver);
- devfs_remove("mmc");
unregister_blkdev(major, "mmc");
}
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-12 14:33:45 +0000