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mmc: MMC sector based cards

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Support for MMC 4.2 sector based cards. This tweaks the init a
bit and reads a new field out of the EXT_CSD.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
This commit is contained in:
Pierre Ossman 2007-02-17 22:15:27 +01:00
parent de85989511
commit 85a18ad93e
4 changed files with 38 additions and 8 deletions
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25
drivers/mmc/mmc.c
View File

@ -1106,11 +1106,29 @@ static void mmc_process_ext_csds(struct mmc_host *host)
mmc_wait_for_req(host, &mrq);
if (cmd.error != MMC_ERR_NONE || data.error != MMC_ERR_NONE) {
printk("%s: unable to read EXT_CSD, performance "
"might suffer.\n", mmc_hostname(card->host));
if (card->csd.capacity == (4096 * 512)) {
printk(KERN_ERR "%s: unable to read EXT_CSD "
"on a possible high capacity card. "
"Card will be ignored.\n",
mmc_hostname(card->host));
mmc_card_set_dead(card);
} else {
printk(KERN_WARNING "%s: unable to read "
"EXT_CSD, performance might "
"suffer.\n",
mmc_hostname(card->host));
}
continue;
}
card->ext_csd.sectors =
ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
if (card->ext_csd.sectors)
mmc_card_set_blockaddr(card);
switch (ext_csd[EXT_CSD_CARD_TYPE]) {
case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:
card->ext_csd.hs_max_dtr = 52000000;
@ -1499,7 +1517,8 @@ static void mmc_setup(struct mmc_host *host)
mmc_send_app_op_cond(host, host->ocr | (sd2 << 30), NULL);
}
} else {
mmc_send_op_cond(host, host->ocr, NULL);
/* The extra bit indicates that we support high capacity */
mmc_send_op_cond(host, host->ocr | (1 << 30), NULL);
}
mmc_discover_cards(host);

11
drivers/mmc/mmc_block.c
View File

@ -491,11 +491,20 @@ static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
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));
set_capacity(md->disk,
card->csd.capacity << (card->csd.read_blkbits - 9));
}
return md;
err_putdisk:

1
include/linux/mmc/card.h
View File

@ -41,6 +41,7 @@ struct mmc_csd {
struct mmc_ext_csd {
unsigned int hs_max_dtr;
unsigned int sectors;
};
struct sd_scr {

1
include/linux/mmc/protocol.h
View File

@ -284,6 +284,7 @@ struct _mmc_csd {
#define EXT_CSD_BUS_WIDTH 183 /* R/W */
#define EXT_CSD_HS_TIMING 185 /* R/W */
#define EXT_CSD_CARD_TYPE 196 /* RO */
#define EXT_CSD_SEC_CNT 212 /* RO, 4 bytes */
/*
* EXT_CSD field definitions