s3cmci: Kconfig selection for PIO/DMA/Both

[mv-sheeva.git] / drivers / mmc / host / Kconfig

diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index 7cb057f3f883837e1fc05e459eef0f3b8219201f..cf6a6545240b7e3f63aabef9cd79209447ee0d84 100644 (file)
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -276,6 +276,40 @@ config MMC_S3C
 
          If unsure, say N.
 
+choice
+       prompt "Samsung S3C SD/MMC transfer code"
+       depends on MMC_S3C
+
+config MMC_S3C_PIO
+       bool "Use PIO transfers only"
+       help
+         Use PIO to transfer data between memory and the hardware.
+
+         PIO is slower than DMA as it requires CPU instructions to
+         move the data. This has been the traditional default for
+         the S3C MCI driver.
+
+config MMC_S3C_DMA
+       bool "Use DMA transfers only (EXPERIMENTAL)"
+       depends on EXPERIMENTAL
+       help
+         Use DMA to transfer data between memory and the hardare.
+
+         Currently, the DMA support in this driver seems to not be
+         working properly and needs to be debugged before this
+         option is useful.
+
+config MMC_S3C_PIODMA
+       bool "Support for both PIO and DMA (EXPERIMENTAL)"
+       help
+         Compile both the PIO and DMA transfer routines into the
+         driver and let the platform select at run-time which one
+         is best.
+
+         See notes for the DMA option.
+
+endchoice
+
 config MMC_SDRICOH_CS
        tristate "MMC/SD driver for Ricoh Bay1Controllers (EXPERIMENTAL)"
        depends on EXPERIMENTAL && PCI && PCMCIA