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MMC: add weak function to detect MMC/SD card

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Most controllers can check if there is a card in the slot.
However, they require pins that could be not available because
required by other functions and the detection of a card must
be performed in another way. This patch adds a weak function
that a board can implement to add its internal custom way
to check the presence of a MMC/SD card.

Signed-off-by: Stefano Babic <sbabic@denx.de>
This commit is contained in:
Stefano Babic 2010-02-05 15:04:43 +01:00 • committed by Tom Rix
parent 250de12bc2
commit 11fdade294
2 changed files with 8 additions and 0 deletions
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7
drivers/mmc/mmc.c
View file

@ -36,6 +36,13 @@
static struct list_head mmc_devices;
static int cur_dev_num = -1;
int __board_mmc_getcd(u8 *cd, struct mmc *mmc) {
return -1;
}
int board_mmc_getcd(u8 *cd, struct mmc *mmc)__attribute__((weak,
alias("__board_mmc_getcd")));
int mmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data)
{
return mmc->send_cmd(mmc, cmd, data);

1
include/mmc.h
View file

@ -272,6 +272,7 @@ int mmc_init(struct mmc *mmc);
int mmc_read(struct mmc *mmc, u64 src, uchar *dst, int size);
struct mmc *find_mmc_device(int dev_num);
void print_mmc_devices(char separator);
int board_mmc_getcd(u8 *cd, struct mmc *mmc);
#ifndef CONFIG_GENERIC_MMC
int mmc_legacy_init(int verbose);