[PATCH v8 1/6] mtd: nand: omap: combine different flavours of 1-bit hamming ecc schemes
Felipe Balbi
balbi at ti.com
Fri Oct 11 08:55:36 PDT 2013
On Fri, Oct 11, 2013 at 07:06:38PM +0530, Pekon Gupta wrote:
> OMAP NAND driver currently supports multiple flavours of 1-bit Hamming
> ecc-scheme, like:
> - OMAP_ECC_HAMMING_CODE_DEFAULT
> 1-bit hamming ecc code using software library
> - OMAP_ECC_HAMMING_CODE_HW
> 1-bit hamming ecc-code using GPMC h/w engine
> - OMAP_ECC_HAMMING_CODE_HW_ROMCODE
> 1-bit hamming ecc-code using GPMC h/w engin with ecc-layout compatible
> to ROM code.
>
> This patch combines above multiple ecc-schemes into single implementation:
> - OMAP_ECC_HAM1_CODE_HW
> 1-bit hamming ecc-code using GPMC h/w engine with ROM-code compatible
> ecc-layout.
>
> Signed-off-by: Pekon Gupta <pekon at ti.com>
Reviewed-by: Felipe Balbi <balbi at ti.com>
> ---
> Documentation/devicetree/bindings/mtd/gpmc-nand.txt | 8 ++++----
> arch/arm/mach-omap2/board-flash.c | 2 +-
> arch/arm/mach-omap2/gpmc.c | 4 +---
> drivers/mtd/nand/omap2.c | 9 +++------
> include/linux/platform_data/mtd-nand-omap2.h | 6 +-----
> 5 files changed, 10 insertions(+), 19 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/mtd/gpmc-nand.txt b/Documentation/devicetree/bindings/mtd/gpmc-nand.txt
> index df338cb..25ee232 100644
> --- a/Documentation/devicetree/bindings/mtd/gpmc-nand.txt
> +++ b/Documentation/devicetree/bindings/mtd/gpmc-nand.txt
> @@ -22,10 +22,10 @@ Optional properties:
> width of 8 is assumed.
>
> - ti,nand-ecc-opt: A string setting the ECC layout to use. One of:
> -
> - "sw" Software method (default)
> - "hw" Hardware method
> - "hw-romcode" gpmc hamming mode method & romcode layout
> + "sw" <deprecated> use "ham1" instead
> + "hw" <deprecated> use "ham1" instead
> + "hw-romcode" <deprecated> use "ham1" instead
> + "ham1" 1-bit Hamming ecc code
> "bch4" 4-bit BCH ecc code
> "bch8" 8-bit BCH ecc code
>
> diff --git a/arch/arm/mach-omap2/board-flash.c b/arch/arm/mach-omap2/board-flash.c
> index fc20a61..ac82512 100644
> --- a/arch/arm/mach-omap2/board-flash.c
> +++ b/arch/arm/mach-omap2/board-flash.c
> @@ -142,7 +142,7 @@ __init board_nand_init(struct mtd_partition *nand_parts, u8 nr_parts, u8 cs,
> board_nand_data.nr_parts = nr_parts;
> board_nand_data.devsize = nand_type;
>
> - board_nand_data.ecc_opt = OMAP_ECC_HAMMING_CODE_DEFAULT;
> + board_nand_data.ecc_opt = OMAP_ECC_BCH8_CODE_HW;
> gpmc_nand_init(&board_nand_data, gpmc_t);
> }
> #endif /* CONFIG_MTD_NAND_OMAP2 || CONFIG_MTD_NAND_OMAP2_MODULE */
> diff --git a/arch/arm/mach-omap2/gpmc.c b/arch/arm/mach-omap2/gpmc.c
> index 579697a..c9fb353 100644
> --- a/arch/arm/mach-omap2/gpmc.c
> +++ b/arch/arm/mach-omap2/gpmc.c
> @@ -1342,9 +1342,7 @@ static void __maybe_unused gpmc_read_timings_dt(struct device_node *np,
> #ifdef CONFIG_MTD_NAND
>
> static const char * const nand_ecc_opts[] = {
> - [OMAP_ECC_HAMMING_CODE_DEFAULT] = "sw",
> - [OMAP_ECC_HAMMING_CODE_HW] = "hw",
> - [OMAP_ECC_HAMMING_CODE_HW_ROMCODE] = "hw-romcode",
> + [OMAP_ECC_HAM1_CODE_HW] = "ham1",
> [OMAP_ECC_BCH4_CODE_HW] = "bch4",
> [OMAP_ECC_BCH8_CODE_HW] = "bch8",
> };
> diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
> index 4ecf0e5..8d521aa 100644
> --- a/drivers/mtd/nand/omap2.c
> +++ b/drivers/mtd/nand/omap2.c
> @@ -1993,10 +1993,7 @@ static int omap_nand_probe(struct platform_device *pdev)
> }
>
> /* select the ecc type */
> - if (pdata->ecc_opt == OMAP_ECC_HAMMING_CODE_DEFAULT)
> - info->nand.ecc.mode = NAND_ECC_SOFT;
> - else if ((pdata->ecc_opt == OMAP_ECC_HAMMING_CODE_HW) ||
> - (pdata->ecc_opt == OMAP_ECC_HAMMING_CODE_HW_ROMCODE)) {
> + if (pdata->ecc_opt == OMAP_ECC_HAM1_CODE_HW) {
> info->nand.ecc.bytes = 3;
> info->nand.ecc.size = 512;
> info->nand.ecc.strength = 1;
> @@ -2025,7 +2022,7 @@ static int omap_nand_probe(struct platform_device *pdev)
> }
>
> /* rom code layout */
> - if (pdata->ecc_opt == OMAP_ECC_HAMMING_CODE_HW_ROMCODE) {
> + if (pdata->ecc_opt == OMAP_ECC_HAM1_CODE_HW) {
>
> if (info->nand.options & NAND_BUSWIDTH_16)
> offset = 2;
> @@ -2033,7 +2030,7 @@ static int omap_nand_probe(struct platform_device *pdev)
> offset = 1;
> info->nand.badblock_pattern = &bb_descrip_flashbased;
> }
> - omap_oobinfo.eccbytes = 3 * (info->mtd.oobsize/16);
> + omap_oobinfo.eccbytes = 3 * (info->mtd.writesize / 512);
> for (i = 0; i < omap_oobinfo.eccbytes; i++)
> omap_oobinfo.eccpos[i] = i+offset;
>
> diff --git a/include/linux/platform_data/mtd-nand-omap2.h b/include/linux/platform_data/mtd-nand-omap2.h
> index 6bf9ef4..cb5a54a 100644
> --- a/include/linux/platform_data/mtd-nand-omap2.h
> +++ b/include/linux/platform_data/mtd-nand-omap2.h
> @@ -23,11 +23,7 @@ enum nand_io {
> };
>
> enum omap_ecc {
> - /* 1-bit ecc: stored at end of spare area */
> - OMAP_ECC_HAMMING_CODE_DEFAULT = 0, /* Default, s/w method */
> - OMAP_ECC_HAMMING_CODE_HW, /* gpmc to detect the error */
> - /* 1-bit ecc: stored at beginning of spare area as romcode */
> - OMAP_ECC_HAMMING_CODE_HW_ROMCODE, /* gpmc method & romcode layout */
> + OMAP_ECC_HAM1_CODE_HW = 0, /* 1-bit Hamming ecc code */
> OMAP_ECC_BCH4_CODE_HW, /* 4-bit BCH ecc code */
> OMAP_ECC_BCH8_CODE_HW, /* 8-bit BCH ecc code */
> };
> --
> 1.8.1
>
--
balbi
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