linux-kernel - Re: [PATCH] ARM: Gemini: Add support for PCI BUS

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Date:	Mon, 29 Nov 2010 19:32:46 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Paulius Zaleckas <paulius.zaleckas@...il.com>
Cc:	Arnd Bergmann <arnd@...db.de>,
	linux-arm-kernel@...ts.infradead.org,
	Hans Ulli Kroll <ulli.kroll@...glemail.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: Gemini: Add support for PCI BUS

On Mon, Nov 29, 2010 at 06:05:07PM +0200, Paulius Zaleckas wrote:
> No he really should NOT use readl/writel. The ONLY difference
> between readl/writel and __raw_readl/__raw_writel is endianess
> conversion. __raw_*l is not doing it. Which to use depend only
> on HW.

Wrong.  readl/writel have barriers too to guarantee ordering between
device accesses and memory accesses.  (device accesses are already
ordered with respect to themselves.)  __raw variants do not
guarantee the relative ordering between memory accesses and device
accesses.
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