On Wed, 30 Mar 2016 18:14:37 +0200
Boris Brezillon <boris.brezil...@free-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.brezil...@free-electrons.com>
Tested with mtd_oobtest.ko on sama5d4ek.
Tested-by: Boris Brezillon <boris.brezil...@free-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
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