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mmc: Allow host drivers to specify a max block size

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Most controllers have an upper limit on the block size. Allow the host
drivers to specify this and make sure we avoid hitting this limit.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
This commit is contained in:
Pierre Ossman
2006-11-21 17:54:23 +01:00
parent dba4accab1
commit fe4a3c7a20
12 changed files with 44 additions and 12 deletions
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24
drivers/mmc/sdhci.c
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@@ -381,7 +381,7 @@ static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_data *data)
/* Sanity checks */
BUG_ON(data->blksz * data->blocks > 524288);
BUG_ON(data->blksz > host->max_block);
BUG_ON(data->blksz > host->mmc->max_blk_size);
BUG_ON(data->blocks > 65535);
/* timeout in us */
@@ -1290,15 +1290,6 @@ static int __devinit sdhci_probe_slot(struct pci_dev *pdev, int slot)
if (caps & SDHCI_TIMEOUT_CLK_UNIT)
host->timeout_clk *= 1000;
host->max_block = (caps & SDHCI_MAX_BLOCK_MASK) >> SDHCI_MAX_BLOCK_SHIFT;
if (host->max_block >= 3) {
printk(KERN_ERR "%s: Invalid maximum block size.\n",
host->slot_descr);
ret = -ENODEV;
goto unmap;
}
host->max_block = 512 << host->max_block;
/*
* Set host parameters.
*/
@@ -1352,6 +1343,19 @@ static int __devinit sdhci_probe_slot(struct pci_dev *pdev, int slot)
*/
mmc->max_seg_size = mmc->max_sectors * 512;
/*
* Maximum block size. This varies from controller to controller and
* is specified in the capabilities register.
*/
mmc->max_blk_size = (caps & SDHCI_MAX_BLOCK_MASK) >> SDHCI_MAX_BLOCK_SHIFT;
if (mmc->max_blk_size >= 3) {
printk(KERN_ERR "%s: Invalid maximum block size.\n",
host->slot_descr);
ret = -ENODEV;
goto unmap;
}
mmc->max_blk_size = 512 << mmc->max_blk_size;
/*
* Init tasklets.
*/