diff options
| author | pekon gupta <pekon@ti.com> | 2013-11-18 19:03:01 +0530 |
|---|---|---|
| committer | Scott Wood <scottwood@freescale.com> | 2013-11-21 13:33:41 -0600 |
| commit | 3f719069c884284b2457448a7afe32b02bd4f782 (patch) | |
| tree | ebcbf9a507b4079b6c1842503f3fd1233bfb066d /drivers/mtd | |
| parent | d016dc42cedbf6102e100fa9ecb58462edfb14f8 (diff) | |
mtd: nand: omap: add CONFIG_NAND_OMAP_ECCSCHEME for selection of ecc-scheme
This patch adds new CONFIG_NAND_OMAP_ECCSCHEME, replacing other distributed
CONFIG_xx used for selecting NAND ecc-schemes.
This patch aims at solving following issues.
1) Currently ecc-scheme is tied to SoC platform, which prevents user to select
other ecc-schemes also supported in hardware. like;
- most of OMAP3 SoC platforms use only 1-bit Hamming ecc-scheme, inspite
the fact that they can use higher ecc-schemes like 8-bit ecc-schemes with
software based error detection (OMAP_ECC_BCH4_CODE_HW_DETECTION_SW).
- most of AM33xx SoC plaforms use 8-bit BCH ecc-scheme for now, but hardware
supports BCH16 ecc-scheme also.
2) Different platforms use different CONFIG_xx to select ecc-schemes, which
adds confusion for user while migrating platforms.
- *CONFIG_NAND_OMAP_ELM* which enables ELM hardware engine, selects only
8-bit BCH ecc-scheme with h/w based error-correction (OMAP_ECC_BCH8_CODE_HW)
whereas ELM hardware engine supports other ecc-schemes also like; BCH4,
and BCH16 (in future).
- *CONFIG_NAND_OMAP_BCH8* selects 8-bit BCH ecc-scheme with s/w based error
correction (OMAP_ECC_BCH8_CODE_HW_DETECTION_SW).
- *CONFIG_SPL_NAND_SOFTECC* selects 1-bit Hamming ecc-scheme using s/w library
Thus adding new *CONFIG_NAND_OMAP_ECCSCHEME* de-couples ecc-scheme dependency
on SoC platform and NAND driver. And user can select ecc-scheme independently
foreach board.
However, selection some hardware based ecc-schemes (OMAP_ECC_BCHx_CODE_HW) still
depends on presence of ELM hardware engine on SoC. (Refer doc/README.nand)
Signed-off-by: Pekon Gupta <pekon@ti.com>
Diffstat (limited to 'drivers/mtd')
| -rw-r--r-- | drivers/mtd/nand/omap_gpmc.c | 13 |
1 files changed, 4 insertions, 9 deletions
diff --git a/drivers/mtd/nand/omap_gpmc.c b/drivers/mtd/nand/omap_gpmc.c index e6b289dec8..5e7e6b3375 100644 --- a/drivers/mtd/nand/omap_gpmc.c +++ b/drivers/mtd/nand/omap_gpmc.c @@ -1004,18 +1004,13 @@ int board_nand_init(struct nand_chip *nand) nand->ecc.layout = &omap_ecclayout; /* select ECC scheme */ -#if defined(CONFIG_NAND_OMAP_ELM) - err = omap_select_ecc_scheme(nand, OMAP_ECC_BCH8_CODE_HW, +#if defined(CONFIG_NAND_OMAP_ECCSCHEME) + err = omap_select_ecc_scheme(nand, CONFIG_NAND_OMAP_ECCSCHEME, CONFIG_SYS_NAND_PAGE_SIZE, CONFIG_SYS_NAND_OOBSIZE); -#elif defined(CONFIG_NAND_OMAP_BCH8) - err = omap_select_ecc_scheme(nand, OMAP_ECC_BCH8_CODE_HW_DETECTION_SW, - CONFIG_SYS_NAND_PAGE_SIZE, CONFIG_SYS_NAND_OOBSIZE); -#elif !defined(CONFIG_SPL_BUILD) || defined(CONFIG_SPL_NAND_SOFTECC) +#else + /* pagesize and oobsize are not required to configure sw ecc-scheme */ err = omap_select_ecc_scheme(nand, OMAP_ECC_HAM1_CODE_SW, 0, 0); -#else - err = omap_select_ecc_scheme(nand, OMAP_ECC_HAM1_CODE_HW, - CONFIG_SYS_NAND_PAGE_SIZE, CONFIG_SYS_NAND_OOBSIZE); #endif if (err) return err; |