mv_xor: support big endian systems using descriptor swap feature
The mv_xor driver had never been used in a big-endian context, and therefore was not using the hardware features to support such an execution environment. The hardware provides a "descriptor swap" bit that automatically swaps the bytes of the DMA descriptors, within blocks of 8 bytes. This requires a different DMA descriptor layout on big-endian systems, as well as enabling this "descriptor swap" bit. This mechanism is exactly identical to the one already used in the mv643xx_eth network driver and the mvneta network driver. Signed-off-by: NThomas Petazzoni <thomas.petazzoni@free-electrons.com> Signed-off-by: NDan Williams <djbw@fb.com>
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