From e48fc15aa205f380b2fc6d565724a55b1efd8083 Mon Sep 17 00:00:00 2001 From: Anatolij Gustschin Date: Mon, 8 Apr 2013 23:28:09 +0200 Subject: mmc: mxcmmc: enable DMA support on mpc512x Add SDHC DMA channel description to the mpc512x device tree to enable slave channel requesting in the mxcmmc driver. mpc512x DMA engine doesn't support endianness conversion when reading/writing data from peripheral's FIFO, so we have to swap data buffers before each DMA write and after each DMA read transfer manually. Since chained SDHC DMA transfers are not supported on mpc512x, limit 'max_segs' tunable parameter to one and initialise it to 64 only when running on i.MX platforms. Signed-off-by: Anatolij Gustschin Acked-by: Sascha Hauer Signed-off-by: Chris Ball --- arch/powerpc/boot/dts/mpc5121.dtsi | 2 ++ 1 file changed, 2 insertions(+) (limited to 'arch/powerpc/boot') diff --git a/arch/powerpc/boot/dts/mpc5121.dtsi b/arch/powerpc/boot/dts/mpc5121.dtsi index 723e292b6b4..710aae6ecb4 100644 --- a/arch/powerpc/boot/dts/mpc5121.dtsi +++ b/arch/powerpc/boot/dts/mpc5121.dtsi @@ -152,6 +152,8 @@ compatible = "fsl,mpc5121-sdhc"; reg = <0x1500 0x100>; interrupts = <8 0x8>; + dmas = <&dma0 30>; + dma-names = "rx-tx"; }; i2c@1700 { -- cgit v1.2.3