linux-kernel - Re: Do cpu-endian MMIO accessors exist?

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Date:	Tue, 21 Jul 2009 23:15:49 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Jiri Slaby <jirislaby@...il.com>
Cc:	Pekka Paalanen <pq@....fi>, linux-kernel@...r.kernel.org
Subject: Re: Do cpu-endian MMIO accessors exist?

On Tuesday 21 July 2009, Jiri Slaby wrote:
> > Do cpu-endian MMIO accessors exist? What should I use, or do I just
> > have to use #ifdef __BIG_ENDIAN?
> 
> There is __raw_readl which doesn't switch bytes.

__raw_readl is not a replacement for real accessors like
ioread32 or in_be32, because it does not synchronize with the
instruction stream.

The best solution would be if you could find a way to set
the hardware into little-endian mode on all architectures.
>From the description, it sounds like the hardware should allow that.

	Arnd <><
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