linux-kernel - Re: [PATCH v5 22/50] mtd: nand: atmel: switch to mtd_ooblayout

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Message-ID: <20160413164106.46d8374a@bbrezillon>
Date:	Wed, 13 Apr 2016 16:41:06 +0200
From:	Boris Brezillon <boris.brezillon@...e-electrons.com>
To:	David Woodhouse <dwmw2@...radead.org>,
	Brian Norris <computersforpeace@...il.com>,
	linux-mtd@...ts.infradead.org,
	Boris Brezillon <boris.brezillon@...e-electrons.com>,
	Richard Weinberger <richard@....at>
Cc:	Daniel Mack <daniel@...que.org>,
	Haojian Zhuang <haojian.zhuang@...il.com>,
	Robert Jarzmik <robert.jarzmik@...e.fr>,
	Kukjin Kim <kgene@...nel.org>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	linux-samsung-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Ralf Baechle <ralf@...ux-mips.org>, linux-mips@...ux-mips.org,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	Wenyou Yang <wenyou.yang@...el.com>,
	Josh Wu <rainyfeeling@...look.com>,
	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Chen-Yu Tsai <wens@...e.org>, linux-sunxi@...glegroups.com,
	Stefan Agner <stefan@...er.ch>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
	punnaiah choudary kalluri <punnaia@...inx.com>,
	Priit Laes <plaes@...es.org>,
	Kamal Dasu <kdasu.kdev@...il.com>,
	bcm-kernel-feedback-list@...adcom.com, linux-api@...r.kernel.org,
	Harvey Hunt <harvey.hunt@...tec.com>,
	Archit Taneja <architt@...eaurora.org>,
	Han Xu <b45815@...escale.com>,
	Huang Shijie <shijie.huang@....com>
Subject: Re: [PATCH v5 22/50] mtd: nand: atmel: switch to mtd_ooblayout_ops

On Wed, 30 Mar 2016 18:14:37 +0200
Boris Brezillon <boris.brezillon@...e-electrons.com> wrote:

> Implementing the mtd_ooblayout_ops interface is the new way of exposing
> ECC/OOB layout to MTD users.
> 
> Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>

Tested with mtd_oobtest.ko on sama5d4ek.

Tested-by: Boris Brezillon <boris.brezillon@...e-electrons.com>

> ---
>  drivers/mtd/nand/atmel_nand.c | 84 ++++++++++++++++++++-----------------------
>  1 file changed, 38 insertions(+), 46 deletions(-)
> 
> diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
> index 321d331..46a601e 100644
> --- a/drivers/mtd/nand/atmel_nand.c
> +++ b/drivers/mtd/nand/atmel_nand.c
> @@ -72,30 +72,44 @@ struct atmel_nand_nfc_caps {
>  	uint32_t rb_mask;
>  };
>  
> -/* oob layout for large page size
> +/*
> + * oob layout for large page size
>   * bad block info is on bytes 0 and 1
>   * the bytes have to be consecutives to avoid
>   * several NAND_CMD_RNDOUT during read
> - */
> -static struct nand_ecclayout atmel_oobinfo_large = {
> -	.eccbytes = 4,
> -	.eccpos = {60, 61, 62, 63},
> -	.oobfree = {
> -		{2, 58}
> -	},
> -};
> -
> -/* oob layout for small page size
> + *
> + * oob layout for small page size
>   * bad block info is on bytes 4 and 5
>   * the bytes have to be consecutives to avoid
>   * several NAND_CMD_RNDOUT during read
>   */
> -static struct nand_ecclayout atmel_oobinfo_small = {
> -	.eccbytes = 4,
> -	.eccpos = {0, 1, 2, 3},
> -	.oobfree = {
> -		{6, 10}
> -	},
> +static int atmel_ooblayout_ecc_sp(struct mtd_info *mtd, int section,
> +				  struct mtd_oob_region *oobregion)
> +{
> +	if (section)
> +		return -ERANGE;
> +
> +	oobregion->length = 4;
> +	oobregion->offset = 0;
> +
> +	return 0;
> +}
> +
> +static int atmel_ooblayout_free_sp(struct mtd_info *mtd, int section,
> +				   struct mtd_oob_region *oobregion)
> +{
> +	if (section)
> +		return -ERANGE;
> +
> +	oobregion->offset = 6;
> +	oobregion->length = mtd->oobsize - oobregion->offset;
> +
> +	return 0;
> +}
> +
> +static const struct mtd_ooblayout_ops atmel_ooblayout_sp_ops = {
> +	.ecc = atmel_ooblayout_ecc_sp,
> +	.free = atmel_ooblayout_free_sp,
>  };
>  
>  struct atmel_nfc {
> @@ -163,8 +177,6 @@ struct atmel_nand_host {
>  	int			*pmecc_delta;
>  };
>  
> -static struct nand_ecclayout atmel_pmecc_oobinfo;
> -
>  /*
>   * Enable NAND.
>   */
> @@ -483,22 +495,6 @@ static int pmecc_get_ecc_bytes(int cap, int sector_size)
>  	return (m * cap + 7) / 8;
>  }
>  
> -static void pmecc_config_ecc_layout(struct nand_ecclayout *layout,
> -				    int oobsize, int ecc_len)
> -{
> -	int i;
> -
> -	layout->eccbytes = ecc_len;
> -
> -	/* ECC will occupy the last ecc_len bytes continuously */
> -	for (i = 0; i < ecc_len; i++)
> -		layout->eccpos[i] = oobsize - ecc_len + i;
> -
> -	layout->oobfree[0].offset = PMECC_OOB_RESERVED_BYTES;
> -	layout->oobfree[0].length =
> -		oobsize - ecc_len - layout->oobfree[0].offset;
> -}
> -
>  static void __iomem *pmecc_get_alpha_to(struct atmel_nand_host *host)
>  {
>  	int table_size;
> @@ -1013,8 +1009,8 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
>  {
>  	struct nand_chip *nand_chip = mtd_to_nand(mtd);
>  	struct atmel_nand_host *host = nand_get_controller_data(nand_chip);
> +	int eccbytes = mtd_ooblayout_count_eccbytes(mtd);
>  	uint32_t val = 0;
> -	struct nand_ecclayout *ecc_layout;
>  	struct mtd_oob_region oobregion;
>  
>  	pmecc_writel(host->ecc, CTRL, PMECC_CTRL_RST);
> @@ -1065,12 +1061,11 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
>  		| PMECC_CFG_AUTO_DISABLE);
>  	pmecc_writel(host->ecc, CFG, val);
>  
> -	ecc_layout = nand_chip->ecc.layout;
>  	pmecc_writel(host->ecc, SAREA, mtd->oobsize - 1);
>  	mtd_ooblayout_ecc(mtd, 0, &oobregion);
>  	pmecc_writel(host->ecc, SADDR, oobregion.offset);
>  	pmecc_writel(host->ecc, EADDR,
> -		     oobregion.offset + ecc_layout->eccbytes - 1);
> +		     oobregion.offset + eccbytes - 1);
>  	/* See datasheet about PMECC Clock Control Register */
>  	pmecc_writel(host->ecc, CLK, 2);
>  	pmecc_writel(host->ecc, IDR, 0xff);
> @@ -1292,11 +1287,8 @@ static int atmel_pmecc_nand_init_params(struct platform_device *pdev,
>  			err_no = -EINVAL;
>  			goto err;
>  		}
> -		pmecc_config_ecc_layout(&atmel_pmecc_oobinfo,
> -					mtd->oobsize,
> -					nand_chip->ecc.total);
>  
> -		nand_chip->ecc.layout = &atmel_pmecc_oobinfo;
> +		mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
>  		break;
>  	default:
>  		dev_warn(host->dev,
> @@ -1644,19 +1636,19 @@ static int atmel_hw_nand_init_params(struct platform_device *pdev,
>  	/* set ECC page size and oob layout */
>  	switch (mtd->writesize) {
>  	case 512:
> -		nand_chip->ecc.layout = &atmel_oobinfo_small;
> +		mtd_set_ooblayout(mtd, &atmel_ooblayout_sp_ops);
>  		ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_528);
>  		break;
>  	case 1024:
> -		nand_chip->ecc.layout = &atmel_oobinfo_large;
> +		mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
>  		ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_1056);
>  		break;
>  	case 2048:
> -		nand_chip->ecc.layout = &atmel_oobinfo_large;
> +		mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
>  		ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_2112);
>  		break;
>  	case 4096:
> -		nand_chip->ecc.layout = &atmel_oobinfo_large;
> +		mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
>  		ecc_writel(host->ecc, MR, ATMEL_ECC_PAGESIZE_4224);
>  		break;
>  	default:



-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com