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sdhci: 8-bit data transfer width support
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Some host controllers such as s5pc110 support the WIDE8 feature.

Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Kyungmin Park authored and Linus Torvalds committed Aug 11, 2010
1 parent cfd1f82 commit ae6d6c9
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Showing 2 changed files with 6 additions and 0 deletions.
5 changes: 5 additions & 0 deletions drivers/mmc/host/sdhci.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1159,6 +1159,11 @@ static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)

ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);

if (ios->bus_width == MMC_BUS_WIDTH_8)
ctrl |= SDHCI_CTRL_8BITBUS;
else
ctrl &= ~SDHCI_CTRL_8BITBUS;

if (ios->bus_width == MMC_BUS_WIDTH_4)
ctrl |= SDHCI_CTRL_4BITBUS;
else
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1 change: 1 addition & 0 deletions drivers/mmc/host/sdhci.h
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Original file line number Diff line number Diff line change
Expand Up @@ -72,6 +72,7 @@
#define SDHCI_CTRL_ADMA1 0x08
#define SDHCI_CTRL_ADMA32 0x10
#define SDHCI_CTRL_ADMA64 0x18
#define SDHCI_CTRL_8BITBUS 0x20

#define SDHCI_POWER_CONTROL 0x29
#define SDHCI_POWER_ON 0x01
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