On Thu, Oct 18, 2012 at 18:56:44, Porter, Matt wrote:

Adds support for the per-EDMA channel event mux. This is required
for any peripherals using DMA crossbar mapped events.

Signed-off-by: Matt Porter <redacted>
---
 arch/arm/common/edma.c             |   63 +++++++++++++++++++++++++++++++++++-
 include/linux/platform_data/edma.h |    1 +
 2 files changed, 63 insertions(+), 1 deletion(-)

..snip..
..snip..

+
+	for (i = 0; xbar_chans[i][0] != -1; i++) {
+		shift = (xbar_chans[i][1] % 4) * 8;
+		offset = xbar_chans[i][1] >> 2;
+		offset <<= 2;
+		mux = __raw_readl((void *)((u32)xbar + offset));
+		mux &= (~(0xff << shift));
+		mux |= (xbar_chans[i][0] << shift);
+		__raw_writel(mux, (void *)((u32)xbar + offset));

This method of calculating Xbar Channel offset has a bug that
the code breaks with unaligned access trap error when requested 
channel to be mapped is odd.

This was fixed in Arago tree [1]. Kindly verify

+	}
+
+	pdata->xbar_chans = xbar_chans;
+
+	return 0;
+}
+

..snip..
..snip..

[1]
http://arago-project.org/git/projects/?p=linux-am33x.git;a=commitdiff;
h=c08d3cb557adf71c79aeefb38888395455824e83

Regards, 
Gururaja