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| author |   Afzal Mohammed <afzal@ti.com> | 2012-10-01 02:47:28 +0530 |
|---|---|---|
| committer | Afzal Mohammed <afzal@ti.com> | 2012-10-15 14:42:08 +0530 |
| commit | 3852ccd66a9bcb2aa6f46bce5442b6d8d08e5b5d (patch) | |
| tree | 194b7067ba84e37560631fb85f7e0f3a0f3080d6 /arch | |
| parent | mtd: nand: omap: bring in gpmc nand macros (diff) | |
| download | linux-dev-3852ccd66a9bcb2aa6f46bce5442b6d8d08e5b5d.tar.xz linux-dev-3852ccd66a9bcb2aa6f46bce5442b6d8d08e5b5d.zip | |
ARM: OMAP2+: nand: bch capability check
Capability of bch schemes could be discovered using soc
revision checks. If soc revision indicates that selected
ecc scheme is not supported bail out.
Signed-off-by: Afzal Mohammed <afzal@ti.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/mach-omap2/gpmc-nand.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/gpmc-nand.c b/arch/arm/mach-omap2/gpmc-nand.c index abdb78a95a94..e89a36c8143b 100644 --- a/arch/arm/mach-omap2/gpmc-nand.c +++ b/arch/arm/mach-omap2/gpmc-nand.c @@ -90,6 +90,27 @@ static int omap2_nand_gpmc_retime( return 0; } +static bool __init gpmc_hwecc_bch_capable(enum omap_ecc ecc_opt) +{ + /* support only OMAP3 class */ + if (!cpu_is_omap34xx()) { + pr_err("BCH ecc is not supported on this CPU\n"); + return 0; + } + + /* + * For now, assume 4-bit mode is only supported on OMAP3630 ES1.x, x>=1. + * Other chips may be added if confirmed to work. + */ + if ((ecc_opt == OMAP_ECC_BCH4_CODE_HW) && + (!cpu_is_omap3630() || (GET_OMAP_REVISION() == 0))) { + pr_err("BCH 4-bit mode is not supported on this CPU\n"); + return 0; + } + + return 1; +} + int __init gpmc_nand_init(struct omap_nand_platform_data *gpmc_nand_data, struct gpmc_timings *gpmc_t) { @@ -128,6 +149,9 @@ int __init gpmc_nand_init(struct omap_nand_platform_data *gpmc_nand_data, gpmc_update_nand_reg(&gpmc_nand_data->reg, gpmc_nand_data->cs); + if (!gpmc_hwecc_bch_capable(gpmc_nand_data->ecc_opt)) + return -EINVAL; + err = platform_device_register(&gpmc_nand_device); if (err < 0) { dev_err(dev, "Unable to register NAND device\n"); |