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

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Date:	Wed, 6 Feb 2013 09:59:39 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Michal Simek <monstr@...str.eu>,
	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, 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 Wed, Feb 6, 2013 at 12:03 AM, Arnd Bergmann <arnd@...db.de> wrote:
> 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 ;-)

PCI PIO? Do you mean "PCI I/O space"?
That's different, and accessed through inb() and friends, right?

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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