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-rw-r--r--drivers/mmc/host/Kconfig26
1 files changed, 23 insertions, 3 deletions
diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index 9d405b18178..d9234648199 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -44,6 +44,19 @@ config MMC_SDHCI_IO_ACCESSORS
This is silent Kconfig symbol that is selected by the drivers that
need to overwrite SDHCI IO memory accessors.
+config MMC_SDHCI_BIG_ENDIAN_32BIT_BYTE_SWAPPER
+ bool
+ select MMC_SDHCI_IO_ACCESSORS
+ help
+ This option is selected by drivers running on big endian hosts
+ and performing I/O to a SDHCI controller through a bus that
+ implements a hardware byte swapper using a 32-bit datum.
+ This endian mapping mode is called "data invariance" and
+ has the effect of scrambling the addresses and formats of data
+ accessed in sizes other than the datum size.
+
+ This is the case for the Freescale eSDHC.
+
config MMC_SDHCI_PCI
tristate "SDHCI support on PCI bus"
depends on MMC_SDHCI && PCI
@@ -75,11 +88,18 @@ config MMC_RICOH_MMC
config MMC_SDHCI_OF
tristate "SDHCI support on OpenFirmware platforms"
depends on MMC_SDHCI && PPC_OF
- select MMC_SDHCI_IO_ACCESSORS
help
This selects the OF support for Secure Digital Host Controller
- Interfaces. So far, only the Freescale eSDHC controller is known
- to exist on OF platforms.
+ Interfaces.
+
+ If unsure, say N.
+
+config MMC_SDHCI_OF_ESDHC
+ bool "SDHCI OF support for the Freescale eSDHC controller"
+ depends on MMC_SDHCI_OF
+ select MMC_SDHCI_BIG_ENDIAN_32BIT_BYTE_SWAPPER
+ help
+ This selects the Freescale eSDHC controller support.
If unsure, say N.