Messages in this thread | ![/](/images/icornerl.gif) | | Date | Mon, 29 Nov 2010 19:32:46 +0000 | From | Russell King - ARM Linux <> | Subject | Re: [PATCH] ARM: Gemini: Add support for PCI BUS |
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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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