[PATCH] dmaengine: fsl-edma: fixup reg offset and hw S/G support in big-endian model

_______________________________________
From: Russell King - ARM Linux <redacted>
Sent: Tuesday, September 23, 2014 6:37 PM
To: Lu Jingchang-B35083
Cc: vinod.koul at intel.com; dmaengine at vger.kernel.org; linux-kernel at vger.kernel.org; linux-arm-kernel at lists.infradead.org
Subject: Re: [PATCH] dmaengine: fsl-edma: fixup reg offset and hw S/G   support in big-endian model

On Tue, Sep 23, 2014 at 05:15:19PM +0800, Jingchang Lu wrote:

 static u16 edma_readw(struct fsl_edma_engine *edma, void __iomem *addr)
 {
-     if (edma->big_endian)
-             return ioread16be(addr);
-     else
+     u32 dst;

This should be unsigned long, if it needs to exist.

+     /* swap the reg offset for these in big-endian mode */
+     if (edma->big_endian) {
+             dst = ((u32)addr & ~0x3) | (((u32)addr & 0x3) ^ 0x2);

This can be simplified to:

                addr = (void __iomem *)((unsigned long)addr ^ 2);

Ditto for all the other cases.

I will do that, Thanks.

Best Regards,
Jingchang