linux-kernel - Re: [PATCH] drivers/block/xsysace - replace in(out)_8/in(out)_be16/in(out)

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Date:	Tue, 5 Feb 2013 23:03:01 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	Michal Simek <monstr@...str.eu>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Vineet Gupta <Vineet.Gupta1@...opsys.com>,
	Alexey Brodkin <Alexey.Brodkin@...opsys.com>,
	linux-kernel@...r.kernel.org, grant.likely@...retlab.ca,
	alan@...rguk.ukuu.org.uk, geert@...ux-m68k.org,
	dahinds@...rs.sourceforge.net
Subject: Re: [PATCH] drivers/block/xsysace - replace in(out)_8/in(out)_be16/in(out)_le16 with generic iowrite(read)8/16(be)

On Tuesday 05 February 2013, Michal Simek wrote:
> I want to be sure about this. I have parsed this again with closer look and
> seems to me that ioread32 is equal to readl and iowrite32 to writel.
> Arnd: Am I right?

Correct. On all the architectures you care about (most importantly, not
x86), readl and ioread32 are defined to have the same semantics. There
are a few exceptions where ioread32 provides a wrapper for PCI
PIO accesses that are not memory mapped, making ioread32 slightly
slower than readl, but for all practical purposes you don't have
to worry about it ;-)

	Arnd
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