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authorViresh Kumar <viresh.kumar@st.com>2012-02-01 16:12:25 +0530
committerVinod Koul <vinod.koul@linux.intel.com>2012-02-22 18:15:38 +0530
commit6bc711f6bd9dd393e1f9bbae354906affcd02aa5 (patch)
treee639502051771cf75899b42ce411581b1e1c0a33 /drivers/dma/dw_dmac.c
parentff7b05f29fd4db810021d905e2dad95ab4fe2984 (diff)
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>
Diffstat (limited to 'drivers/dma/dw_dmac.c')
-rw-r--r--drivers/dma/dw_dmac.c20
1 files changed, 16 insertions, 4 deletions
diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c
index 5d7b199208d..9f4310f013f 100644
--- a/drivers/dma/dw_dmac.c
+++ b/drivers/dma/dw_dmac.c
@@ -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: