[PATCH 1/2] dma: mv_xor: use readl/writel instead of __raw_{readl, writel}

Thomas Petazzoni thomas.petazzoni at free-electrons.com
Mon Jul 29 11:14:26 EDT 2013

Dear Russell King - ARM Linux,

On Mon, 29 Jul 2013 16:08:27 +0100, Russell King - ARM Linux wrote:
> On Mon, Jul 29, 2013 at 05:05:09PM +0200, Thomas Petazzoni wrote:
> > In order to support big-endian execution, the mv_xor driver is changed
> > to use thhe readl() and writel() accessors that properly convert from
> > the CPU endianess to the device endianess (which in the case of
> > Marvell XOR hardware is always little-endian).
> Is it necessary that all these be barrier-ied IO operations?

As they used to be __raw_..., I presume that those barrier-ied
operations are not strictly needed, so I could use the relaxed
variants instead.

Thomas Petazzoni, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.

More information about the linux-arm-kernel mailing list