linux-kernel - Re: [PATCH 1/2] mtd: atmel_nand: use __iowrite32

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Message-ID: <20141021103336.GI28745@intel.com>
Date:	Tue, 21 Oct 2014 16:03:36 +0530
From:	Vinod Koul <vinod.koul@...el.com>
To:	Josh Wu <josh.wu@...el.com>
Cc:	linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
	David Woodhouse <dwmw2@...radead.org>,
	Brian Norris <computersforpeace@...il.com>,
	Jingoo Han <jg1.han@...sung.com>,
	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
	Mark Brown <broonie@...aro.org>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Herve Codina <Herve.CODINA@...ad.com>,
	Bo Shen <voice.shen@...el.com>,
	Fabio Estevam <fabio.estevam@...escale.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Michael Grzeschik <m.grzeschik@...gutronix.de>,
	Josh Triplett <josh@...htriplett.org>,
	Wei Yongjun <yongjun_wei@...ndmicro.com.cn>,
	Huang Shijie <shijie8@...il.com>,
	Michael Opdenacker <michael.opdenacker@...e-electrons.com>
Subject: Re: [PATCH 1/2] mtd: atmel_nand: use __iowrite32_copy for 32 bit
 copy

On Tue, Oct 21, 2014 at 06:03:24PM +0800, Josh Wu wrote:
> Hi, Vinod
> 
> On 10/21/2014 12:06 AM, Vinod Koul wrote:
> >The driver was also using own method to do 32bit copy, turns out
> >we have a kernel API so use that instead
> >
> >Signed-off-by: Vinod Koul <vinod.koul@...el.com>
> 
> Thanks for the patch.
> Acked-by: Josh Wu <josh.wu@...el.com>
> 
> BTW, is there any similar kernel API that is for the read from io?
I have not stumbled out on that yet, if someone know of it pls yell!!
If there seems to be lack of it, I would suggest we add a similar API in
core like __iowrite32_copy()

-- 
~Vinod

> 
> Best Regards,
> Josh Wu
> 
> >---
> >  drivers/mtd/nand/atmel_nand.c |   10 +++-------
> >  1 files changed, 3 insertions(+), 7 deletions(-)
> >
> >diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
> >index e321c56..b03e80d 100644
> >--- a/drivers/mtd/nand/atmel_nand.c
> >+++ b/drivers/mtd/nand/atmel_nand.c
> >@@ -265,14 +265,10 @@ static void memcpy32_fromio(void *trg, const void __iomem  *src, size_t size)
> >  		*t++ = readl_relaxed(s++);
> >  }
> >-static void memcpy32_toio(void __iomem *trg, const void *src, int size)
> >+static inline void memcpy32_toio(void __iomem *trg, const void *src, int size)
> >  {
> >-	int i;
> >-	u32 __iomem *t = trg;
> >-	const u32 *s = src;
> >-
> >-	for (i = 0; i < (size >> 2); i++)
> >-		writel_relaxed(*s++, t++);
> >+	/* __iowrite32_copy use 32bit size values so divide by 4 */
> >+	__iowrite32_copy(trg, src, size/4);
> >  }
> >  /*
> 

-- 
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