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

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Date:	Tue, 12 Feb 2013 17:25:07 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	Michal Simek <monstr@...str.eu>
Cc:	Grant Likely <grant.likely@...retlab.ca>,
	Alexey Brodkin <Alexey.Brodkin@...opsys.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	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 Tuesday 12 February 2013, Michal Simek wrote:
> But on Microblaze LE is necessary to use different datain/out_le16
> functions as below
> which are also not compatible with Microblaze and PPC BE.
> 
> diff --git a/drivers/block/xsysace.c b/drivers/block/xsysace.c
> index bbad046..8dd192c 100644
> --- a/drivers/block/xsysace.c
> +++ b/drivers/block/xsysace.c
> @@ -314,7 +314,7 @@ static void ace_datain_le16(struct ace_device *ace)
>         int i = ACE_FIFO_SIZE / 2;
>         u16 *dst = ace->data_ptr;
>         while (i--)
> -               *dst++ = ioread16be(ace->baseaddr + 0x40);
> +               *dst++ = ioread16(ace->baseaddr + 0x40);
>         ace->data_ptr = dst;
>  }

Hmm, that actually seems sane then: You can replace the loop around
ioread16be with a single ioread32_rep() call, which will use
the correct native endian accesses on both LE Microblaze
and on all the big-endian platforms. Note that the asm-generic
definition of that function was broken until quite recently
when Will Deacon repaired it in order to support ARM64.

	Arnd
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