linux-kernel - Re: [PATCH] dmaengine: fsl-edma: fixup reg offset and hw S/G support in big-endian model

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Date:	Tue, 23 Sep 2014 17:21:06 +0000
From:	Jingchang Lu <jingchang.lu@...escale.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
CC:	"vinod.koul@...el.com" <vinod.koul@...el.com>,
	"dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] dmaengine: fsl-edma: fixup reg offset and hw S/G	support
 in big-endian model

_______________________________________
From: Russell King - ARM Linux <linux@....linux.org.uk>
Sent: Tuesday, September 23, 2014 6:37 PM
To: Lu Jingchang-B35083
Cc: vinod.koul@...el.com; dmaengine@...r.kernel.org; linux-kernel@...r.kernel.org; linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] dmaengine: fsl-edma: fixup reg offset and hw S/G   support in big-endian model

On Tue, Sep 23, 2014 at 05:15:19PM +0800, Jingchang Lu wrote:
>  static u16 edma_readw(struct fsl_edma_engine *edma, void __iomem *addr)
>  {
> -     if (edma->big_endian)
> -             return ioread16be(addr);
> -     else
> +     u32 dst;

This should be unsigned long, if it needs to exist.

> +     /* swap the reg offset for these in big-endian mode */
> +     if (edma->big_endian) {
> +             dst = ((u32)addr & ~0x3) | (((u32)addr & 0x3) ^ 0x2);

This can be simplified to:

                addr = (void __iomem *)((unsigned long)addr ^ 2);

Ditto for all the other cases.

I will do that, Thanks.

Best Regards,
Jingchang

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