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mmc: mxcmmc: enable DMA support on mpc512x

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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 <agust@denx.de>
Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Anatolij Gustschin
2013-04-08 23:28:09 +02:00
committed by Chris Ball
parent 42477053c3
commit e48fc15aa2
2 changed files with 35 additions and 2 deletions
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2
arch/powerpc/boot/dts/mpc5121.dtsi
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@@ -152,6 +152,8 @@
compatible = "fsl,mpc5121-sdhc";
reg = <0x1500 0x100>;
interrupts = <8 0x8>;
dmas = <&dma0 30>;
dma-names = "rx-tx";
};
i2c@1700 {