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SubjectRe: [PATCH v2 5/9] mtd: rawnand: jz4780: Add ooblayout for the JZ4725B
On Sat,  2 Feb 2019 20:19:22 -0300
Paul Cercueil <paul@crapouillou.net> wrote:

> The boot ROM of the JZ4725B SoC expects a specific OOB layout on the
> NAND.
>
> Add an optional "ingenic,oob-layout" device property. When set to
> "ingenic,jz4725b", this specific OOB layout is used.

It's a SoC-specific layout, please add a compatible for ingenic,jz4725b
and use it to determine the layout to use.

>
> Signed-off-by: Paul Cercueil <paul@crapouillou.net>
> ---
>
> Changes:
>
> v2: Instead of forcing the OOB layout, leave it to the board code or
> devicetree to decide if the jz4725b-specific layout should be used
> or not.
>
> drivers/mtd/nand/raw/ingenic/jz4780_nand.c | 51 +++++++++++++++++++++-
> 1 file changed, 50 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mtd/nand/raw/ingenic/jz4780_nand.c b/drivers/mtd/nand/raw/ingenic/jz4780_nand.c
> index c0855fef7735..baebb9a5c7c8 100644
> --- a/drivers/mtd/nand/raw/ingenic/jz4780_nand.c
> +++ b/drivers/mtd/nand/raw/ingenic/jz4780_nand.c
> @@ -44,6 +44,7 @@ struct jz4780_nand_cs {
> struct jz4780_nand_controller {
> struct device *dev;
> const struct jz_soc_info *soc_info;
> + const struct mtd_ooblayout_ops *oob_layout;
> struct jz4780_bch *bch;
> struct nand_controller controller;
> unsigned int num_banks;
> @@ -213,7 +214,7 @@ 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->oob_layout);
>
> return 0;
> }
> @@ -345,11 +346,47 @@ static int jz4780_nand_init_chips(struct jz4780_nand_controller *nfc,
> 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 int jz4780_nand_probe(struct platform_device *pdev)
> {
> struct device *dev = &pdev->dev;
> unsigned int num_banks;
> struct jz4780_nand_controller *nfc;
> + const char *layout;
> int ret;
>
> num_banks = jz4780_nemc_num_banks(dev);
> @@ -366,6 +403,18 @@ static int jz4780_nand_probe(struct platform_device *pdev)
> if (!nfc->soc_info)
> return -EINVAL;
>
> + nfc->oob_layout = &nand_ooblayout_lp_ops;
> +
> + ret = device_property_read_string(dev, "ingenic,oob-layout", &layout);
> + if (!ret) {
> + if (!strcmp(layout, "ingenic,jz4725b")) {
> + nfc->oob_layout = &jz4725b_ooblayout_ops;
> + } else {
> + dev_err(dev, "Unrecognized OOB layout %s\n", layout);
> + return -EINVAL;
> + }
> + }
> +
> /*
> * Check for BCH HW before we call nand_scan_ident, to prevent us from
> * having to call it again if the BCH driver returns -EPROBE_DEFER.

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