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MMC: S3C24XX: Refuse incorrectly aligned transfers

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The hardware does not support any multi-block transfers
with an block-size that is not 32bit aligned. Also the driver
itself does not support single block non-32bit transfers
either.

Ensure that the s3cmci_setup_data() returns the appropriate
error if we encounter this.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
This commit is contained in:
Ben Dooks 2008-06-30 22:40:39 +01:00 committed by Pierre Ossman
parent 4dde7f7552
commit 7e9c7b6402
1 changed files with 11 additions and 0 deletions
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11
drivers/mmc/host/s3cmci.c
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@ -807,6 +807,17 @@ static int s3cmci_setup_data(struct s3cmci_host *host, struct mmc_data *data)
return 0;
}
if ((data->blksz & 3) != 0) {
/* We cannot deal with unaligned blocks with more than
* one block being transfered. */
if (data->blocks > 1)
return -EINVAL;
/* No support yet for non-word block transfers. */
return -EINVAL;
}
while (readl(host->base + S3C2410_SDIDSTA) &
(S3C2410_SDIDSTA_TXDATAON | S3C2410_SDIDSTA_RXDATAON)) {