diff options
| author | Stefan Roese <[email protected]> | 2015-09-02 14:29:12 +0200 |
|---|---|---|
| committer | Tom Rini <[email protected]> | 2015-09-11 17:15:13 -0400 |
| commit | 1a103c6caa0b27fcd3798267b980444f5459860f (patch) | |
| tree | 5cf3d03804ff4d29d1968fefbbcf6ea8a53222b8 /drivers | |
| parent | b9599dd857b3f6ed9c7c7e7438dffb84ee5ce1a0 (diff) | |
mtd: nand: fsmc: Add BCH4 SW ECC support for SPEAr600
This patch adds support for 4-bit ECC BCH4 for the SPEAr600 SoC. This can
be used by boards equipped with a NAND chip that requires 4-bit ECC strength.
The SPEAr600 HW ECC only supports 1-bit ECC strength.
To enable SW BCH4, you need to specify this in your config header:
#define CONFIG_NAND_ECC_BCH
#define CONFIG_BCH
And use the command "nandecc bch4" to select this ECC scheme upon runtime.
Tested on SPEAr600 x600 board.
Signed-off-by: Stefan Roese <[email protected]>
Cc: Scott Wood <[email protected]>
Acked-by: Viresh Kumar <[email protected]>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mtd/nand/fsmc_nand.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/drivers/mtd/nand/fsmc_nand.c b/drivers/mtd/nand/fsmc_nand.c index 567eff09140..0976a67ff83 100644 --- a/drivers/mtd/nand/fsmc_nand.c +++ b/drivers/mtd/nand/fsmc_nand.c @@ -13,6 +13,7 @@ #include <asm/io.h> #include <linux/bitops.h> #include <linux/err.h> +#include <linux/mtd/nand_bch.h> #include <linux/mtd/nand_ecc.h> #include <linux/mtd/fsmc_nand.h> #include <asm/arch/hardware.h> @@ -390,6 +391,45 @@ static int fsmc_read_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip, return 0; } +#ifndef CONFIG_SPL_BUILD +/* + * fsmc_nand_switch_ecc - switch the ECC operation between different engines + * + * @eccstrength - the number of bits that could be corrected + * (1 - HW, 4 - SW BCH4) + */ +int __maybe_unused fsmc_nand_switch_ecc(uint32_t eccstrength) +{ + struct nand_chip *nand; + struct mtd_info *mtd; + int err; + + mtd = &nand_info[nand_curr_device]; + nand = mtd->priv; + + /* Setup the ecc configurations again */ + if (eccstrength == 1) { + nand->ecc.mode = NAND_ECC_HW; + nand->ecc.bytes = 3; + nand->ecc.strength = 1; + nand->ecc.layout = &fsmc_ecc1_layout; + nand->ecc.correct = nand_correct_data; + } else { + nand->ecc.mode = NAND_ECC_SOFT_BCH; + nand->ecc.calculate = nand_bch_calculate_ecc; + nand->ecc.correct = nand_bch_correct_data; + nand->ecc.bytes = 7; + nand->ecc.strength = 4; + nand->ecc.layout = NULL; + } + + /* Update NAND handling after ECC mode switch */ + err = nand_scan_tail(mtd); + + return err; +} +#endif /* CONFIG_SPL_BUILD */ + int fsmc_nand_init(struct nand_chip *nand) { static int chip_nr; |