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

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Message-ID: <20090721213333.GA27202@infradead.org>
Date:	Tue, 21 Jul 2009 17:33:33 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Jiri Slaby <jirislaby@...il.com>, Pekka Paalanen <pq@....fi>,
	linux-kernel@...r.kernel.org
Subject: Re: Do cpu-endian MMIO accessors exist?

On Tue, Jul 21, 2009 at 11:15:49PM +0200, Arnd Bergmann wrote:
> 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.

Why would you want to do that?  That just means a useless byteswap.
We really should have a generic native-endian MMIO-access API as there
is quite a bit of hardware with features like that, and currently we
have a miriad of hacks using __raw_* and manual barriers, the ppc
specific accessors and god knows what.

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