From de39f5fa09d006561958431779c5a5e5b5b4e0ea Mon Sep 17 00:00:00 2001
From: Barry Song <21cnbao@gmail.com>
Date: Tue, 6 Aug 2013 14:21:21 +0800
Subject: [PATCH] spi: sirf: use DMA if both buffer address and length are
 aligned

this patch enables DMA support for SiRFSoC SPI driver, if both
buffers and length are aligned with DMA controller's hardware
limitation, use generic SiRF generic dmaengine driver.

for PIO, SiRF SPI controller actually is using rx to trigger rx,
that means if we write any word to tx fifo, we will get a word
from rx fifo. for DMA, we use two different channel for tx and
rx, and issue them both for every transfer.

Signed-off-by: Barry Song <Baohua.Song@csr.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
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