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[MMC] sdhci: correct register order 

The sdhci specification states that some registers must be written to in a
specific order.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Pierre Ossman 2006-06-30 02:22:25 -07:00 committed by Russell King
parent 1c8cde92fa
commit c7fa9963ee
1 changed files with 27 additions and 17 deletions
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44
drivers/mmc/sdhci.c
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@ -270,16 +270,13 @@ static void sdhci_transfer_pio(struct sdhci_host *host)
static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_data *data)
{
u16 mode;
u8 count;
unsigned target_timeout, current_timeout;
WARN_ON(host->data);
if (data == NULL) {
writew(0, host->ioaddr + SDHCI_TRANSFER_MODE);
if (data == NULL)
return;
}
DBG("blksz %04x blks %04x flags %08x\n",
data->blksz, data->blocks, data->flags);
@ -317,19 +314,6 @@ static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_data *data)
writeb(count, host->ioaddr + SDHCI_TIMEOUT_CONTROL);
mode = SDHCI_TRNS_BLK_CNT_EN;
if (data->blocks > 1)
mode |= SDHCI_TRNS_MULTI;
if (data->flags & MMC_DATA_READ)
mode |= SDHCI_TRNS_READ;
if (host->flags & SDHCI_USE_DMA)
mode |= SDHCI_TRNS_DMA;
writew(mode, host->ioaddr + SDHCI_TRANSFER_MODE);
writew(data->blksz, host->ioaddr + SDHCI_BLOCK_SIZE);
writew(data->blocks, host->ioaddr + SDHCI_BLOCK_COUNT);
if (host->flags & SDHCI_USE_DMA) {
int count;
@ -347,6 +331,30 @@ static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_data *data)
host->offset = 0;
host->remain = host->cur_sg->length;
}
writew(data->blksz, host->ioaddr + SDHCI_BLOCK_SIZE);
writew(data->blocks, host->ioaddr + SDHCI_BLOCK_COUNT);
}
static void sdhci_set_transfer_mode(struct sdhci_host *host,
struct mmc_data *data)
{
u16 mode;
WARN_ON(host->data);
if (data == NULL)
return;
mode = SDHCI_TRNS_BLK_CNT_EN;
if (data->blocks > 1)
mode |= SDHCI_TRNS_MULTI;
if (data->flags & MMC_DATA_READ)
mode |= SDHCI_TRNS_READ;
if (host->flags & SDHCI_USE_DMA)
mode |= SDHCI_TRNS_DMA;
writew(mode, host->ioaddr + SDHCI_TRANSFER_MODE);
}
static void sdhci_finish_data(struct sdhci_host *host)
@ -447,6 +455,8 @@ static void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
writel(cmd->arg, host->ioaddr + SDHCI_ARGUMENT);
sdhci_set_transfer_mode(host, cmd->data);
if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) {
printk(KERN_ERR "%s: Unsupported response type! "
"Please report this to " BUGMAIL ".\n",