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

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Date:	Tue, 29 Jan 2013 16:27:34 +0000
From:	Arnd Bergmann <arnd.bergmann@...aro.org>
To:	Alexey Brodkin <Alexey.Brodkin@...opsys.com>
Cc:	linux-kernel@...r.kernel.org, grant.likely@...retlab.ca,
	Vineet.Gupta1@...opsys.com
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 29 January 2013, Alexey Brodkin wrote:
> in(out)_8/in(out)_be16/in(out)_le16 are very powerpc/microblaze
> specific. To enable use of Xilinx System ACE driver build for other
> architectures (for example it's possible to use it on Xilinx ml-509
> board with ARC700 in FPGA) we need to use generic implementation of
> accessors.
> 
> Current implementation was successfully built with Sourcery G++ Lite
> 2011.03-39 for Power EABI (ppc44x_defconfig).
> 
> Signed-off-by: Alexey Brodkin <abrodkin@...opsys.com>

Is this driver used on powerpc64 as well, or just on microblaze
and/or 32 bit powerpc?

On 64 bit powerpc, ioread involves extra overhead because it
goes through the PCI error handling implementation, so we should
keep using in_le() there.	

	Arnd
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