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

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Date:	Thu, 07 Feb 2013 23:23:13 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Alexey Brodkin <Alexey.Brodkin@...opsys.com>
Cc:	Grant Likely <grant.likely@...retlab.ca>,
	Michal Simek <monstr@...str.eu>, Arnd Bergmann <arnd@...db.de>,
	Vineet Gupta <Vineet.Gupta1@...opsys.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Geert Uytterhoeven <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 Thu, 2013-02-07 at 23:20 +1100, Benjamin Herrenschmidt wrote:

> For the "swapped" case, I would suggest using ioread16be for the registers
> for the data port, use ioread16_rep followed by a pass of byteswap. I assume
> that this incorrect wiring case only happens on BE platforms right ?

Of course that won't work on writes unless you use a bounce buffer, but
heh, who cares, it's busted anyway ?

Another option is to stick with a loop of ioread16be/iowrite16be, it
*should* work, but it will have too many memory barriers, the impact
will vary depending on the core.

Cheers,
Ben.


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