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

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Message-ID: <514B3D05.3070501@synopsys.com>
Date:	Thu, 21 Mar 2013 21:01:57 +0400
From:	Alexey Brodkin <Alexey.Brodkin@...opsys.com>
To:	Arnd Bergmann <arnd@...db.de>
CC:	Michal Simek <monstr@...str.eu>,
	Grant Likely <grant.likely@...retlab.ca>,
	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 02/12/2013 09:25 PM, Arnd Bergmann wrote:
> 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
>

It seems like this thread was not updated for many weeks now.
I'm wondering if I missed something or if I may do something to help you 
guys move forward with proposed patch?

-Alexey
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