linux-kernel - Re: [PATCH 3/3] mtd/nand : workaround for Freescale FCM to support large-page Nand chip

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Message-ID: <4ED3C2E2.9040601@freescale.com>
Date:	Mon, 28 Nov 2011 11:20:34 -0600
From:	Scott Wood <scottwood@...escale.com>
To:	Li Yang-R58472 <r58472@...escale.com>
CC:	Liu Shuo-B35362 <B35362@...escale.com>,
	"dwmw2@...radead.org" <dwmw2@...radead.org>,
	"Artem.Bityutskiy@...ia.com" <Artem.Bityutskiy@...ia.com>,
	Wood Scott-B07421 <B07421@...escale.com>,
	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] mtd/nand : workaround for Freescale FCM to support
 large-page Nand chip

On 11/24/2011 01:37 AM, Li Yang-R58472 wrote:
>> +static void io_to_buffer(struct mtd_info *mtd, int subpage, int oob)
>> +{
>> +	struct nand_chip *chip = mtd->priv;
>> +	struct fsl_elbc_mtd *priv = chip->priv;
>> +	struct fsl_elbc_fcm_ctrl *elbc_fcm_ctrl = priv->ctrl->nand;
>> +	void *src, *dst;
>> +	int len = (oob ? 64 : 2048);
>> +
>> +	if (oob)
>> +		dst = elbc_fcm_ctrl->buffer + mtd->writesize + subpage * 64;
>> +	else
>> +		dst = elbc_fcm_ctrl->buffer + subpage * 2048;
>> +
>> +	src = elbc_fcm_ctrl->addr + (oob ? 2048 : 0);
>> +	memcpy_fromio(dst, src, len);
> 
> Might be safer to use _memcpy_fromio()

How so?

memcpy_fromio() is the public interface that will end up calling
_memcpy_fromio() on powerpc.

-Scott

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