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

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: