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dmaengine/dw_dmac: Add 64 bit access width support for slave xfers on mem side

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64 bit transfers are possible on both sides in slave transfers (memory as well
as peripherals). This patch adds support for it memory side 64 bit transfers.

Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>
This commit is contained in:
Viresh Kumar 2012-02-01 16:12:25 +05:30 committed by Vinod Koul
parent ff7b05f29f
commit 6bc711f6bd
1 changed files with 16 additions and 4 deletions
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20
drivers/dma/dw_dmac.c
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@ -749,8 +749,14 @@ dwc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
mem = sg_phys(sg);
len = sg_dma_len(sg);
mem_width = 2;
if (unlikely(mem & 3 || len & 3))
if (!((mem | len) & 7))
mem_width = 3;
else if (!((mem | len) & 3))
mem_width = 2;
else if (!((mem | len) & 1))
mem_width = 1;
else
mem_width = 0;
slave_sg_todev_fill_desc:
@ -807,8 +813,14 @@ slave_sg_todev_fill_desc:
mem = sg_phys(sg);
len = sg_dma_len(sg);
mem_width = 2;
if (unlikely(mem & 3 || len & 3))
if (!((mem | len) & 7))
mem_width = 3;
else if (!((mem | len) & 3))
mem_width = 2;
else if (!((mem | len) & 1))
mem_width = 1;
else
mem_width = 0;
slave_sg_fromdev_fill_desc: