linux-kernel - Re: ioremap definition in generic io.h

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Date:	Thu, 30 Sep 2010 13:45:16 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Jonas Bonn <jonas@...thpole.se>
Cc:	Jiri Slaby <jirislaby@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: ioremap definition in generic io.h

On Wednesday 29 September 2010, Jonas Bonn wrote:
> On another note, looking at the definitions of ioread32/iowrite32, they
> imply a little-endian bus.  Some architectures (e.g. Microblaze) define
> these to use host-native byte ordering instead.  Is there a correct
> way these functions should be defined?

ioread32/iowrite32 are accessor functions for PCI byte order which is
little endian. If microblaze does this differently, that is a microblaze
bug. Any code that needs big-endian I/O should use ioread32be/iowrite32be.

	Arnd
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