sdhci-of: reorganize driver to support additional hardware

[pandora-kernel.git] / drivers / mmc / host / Kconfig

diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index 9d405b1..d923464 100644 (file)
--- 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.