linux-kernel - Re: [PATCH 5/8] mtd: rawnand: jz4780: Add ooblayout for the JZ4725B

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Message-ID: <20190118092945.4ca0fef2@bbrezillon>
Date:   Fri, 18 Jan 2019 09:29:45 +0100
From:   Boris Brezillon <bbrezillon@...nel.org>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Richard Weinberger <richard@....at>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paul.burton@...s.com>,
        James Hogan <jhogan@...nel.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Harvey Hunt <harveyhuntnexus@...il.com>,
        linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mips@...r.kernel.org
Subject: Re: [PATCH 5/8] mtd: rawnand: jz4780: Add ooblayout for the JZ4725B

On Thu, 17 Jan 2019 22:06:31 -0300
Paul Cercueil <paul@...pouillou.net> wrote:

> The boot ROM of the JZ4725B SoC expects a specific OOB layout on the
> NAND, so it makes sense to use this OOB layout unconditionally on this
> SoC.
> 
> Signed-off-by: Paul Cercueil <paul@...pouillou.net>

Reviewed-by: Boris Brezillon <bbrezillon@...nel.org>

> ---
>  drivers/mtd/nand/raw/jz4780_nand.c | 40 +++++++++++++++++++++++++++++++++++++-
>  1 file changed, 39 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mtd/nand/raw/jz4780_nand.c b/drivers/mtd/nand/raw/jz4780_nand.c
> index cf24bf12884f..073b3da5c3f7 100644
> --- a/drivers/mtd/nand/raw/jz4780_nand.c
> +++ b/drivers/mtd/nand/raw/jz4780_nand.c
> @@ -34,6 +34,7 @@ struct jz_soc_info {
>  	unsigned long data_offset;
>  	unsigned long addr_offset;
>  	unsigned long cmd_offset;
> +	const struct mtd_ooblayout_ops *oob_layout;
>  };
>  
>  struct jz4780_nand_cs {
> @@ -208,7 +209,7 @@ static int jz4780_nand_attach_chip(struct nand_chip *chip)
>  		return -EINVAL;
>  	}
>  
> -	mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
> +	mtd_set_ooblayout(mtd, nfc->soc_info->oob_layout);
>  
>  	return 0;
>  }
> @@ -398,16 +399,53 @@ static int jz4780_nand_remove(struct platform_device *pdev)
>  	return 0;
>  }
>  
> +static int jz4725b_ooblayout_ecc(struct mtd_info *mtd, int section,
> +				 struct mtd_oob_region *oobregion)
> +{
> +	struct nand_chip *chip = mtd_to_nand(mtd);
> +	struct nand_ecc_ctrl *ecc = &chip->ecc;
> +
> +	if (section || !ecc->total)
> +		return -ERANGE;
> +
> +	oobregion->length = ecc->total;
> +	oobregion->offset = 3;
> +
> +	return 0;
> +}
> +
> +static int jz4725b_ooblayout_free(struct mtd_info *mtd, int section,
> +				  struct mtd_oob_region *oobregion)
> +{
> +	struct nand_chip *chip = mtd_to_nand(mtd);
> +	struct nand_ecc_ctrl *ecc = &chip->ecc;
> +
> +	if (section)
> +		return -ERANGE;
> +
> +	oobregion->length = mtd->oobsize - ecc->total - 3;
> +	oobregion->offset = 3 + ecc->total;
> +
> +	return 0;
> +}
> +
> +const struct mtd_ooblayout_ops jz4725b_ooblayout_ops = {
> +	.ecc = jz4725b_ooblayout_ecc,
> +	.free = jz4725b_ooblayout_free,
> +};
> +
>  static const struct jz_soc_info jz4725b_soc_info = {
>  	.data_offset = 0x00000000,
>  	.cmd_offset  = 0x00008000,
>  	.addr_offset = 0x00010000,
> +	.oob_layout  = &jz4725b_ooblayout_ops,
>  };
>  
>  static const struct jz_soc_info jz4780_soc_info = {
>  	.data_offset = 0x00000000,
>  	.cmd_offset  = 0x00400000,
>  	.addr_offset = 0x00800000,
> +	.oob_layout  = &nand_ooblayout_lp_ops,
>  };
>  
>  static const struct of_device_id jz4780_nand_dt_match[] = {