diff options
| author | Laurence Withers | 2011-09-26 16:02:30 +0000 |
|---|---|---|
| committer | Scott Wood | 2011-10-10 15:28:05 -0500 |
| commit | 60161943719c4054453f6932ad2bd5fe2285bf1b (patch) | |
| tree | 84e782cd83a6a2a3807d718fb080c8053fb2fa1b /drivers/mtd/nand/davinci_nand.c | |
| parent | 0841ca90f22d73b0ea4642ef1ce33d879bb2f3ff (diff) | |
NAND: davinci: choose correct 1-bit h/w ECC reg
In nand_davinci_readecc(), select the correct NANDF<n>ECC register based
on CONFIG_SYS_NAND_CS rather than hardcoding the choice of NANDF1ECC.
This allows 1-bit hardware ECC to work with chip select other than CS2.
Note this now matches the usage in nand_davinci_enable_hwecc(), which
already had the correct handling, and allows refactoring to a single
function encapsulating the register read.
Without this fix, writing NAND pages to a chip not wired to CS2 would
result in in the ECC calculation always returning FFFFFF for each
512-byte segment, and reading back a correctly written page (one with
ECC intact) would always fail. With this fix, the ECC is written and
verified correctly.
Signed-off-by: Laurence Withers <lwithers@guralp.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>
Diffstat (limited to 'drivers/mtd/nand/davinci_nand.c')
| -rw-r--r-- | drivers/mtd/nand/davinci_nand.c | 26 |
1 files changed, 13 insertions, 13 deletions
diff --git a/drivers/mtd/nand/davinci_nand.c b/drivers/mtd/nand/davinci_nand.c index d41579c9cef..e8506ddd9bd 100644 --- a/drivers/mtd/nand/davinci_nand.c +++ b/drivers/mtd/nand/davinci_nand.c @@ -176,35 +176,35 @@ static void nand_davinci_hwcontrol(struct mtd_info *mtd, int cmd, #ifdef CONFIG_SYS_NAND_HW_ECC -static void nand_davinci_enable_hwecc(struct mtd_info *mtd, int mode) +static u_int32_t nand_davinci_readecc(struct mtd_info *mtd) { - u_int32_t val; + u_int32_t ecc = 0; - (void)__raw_readl(&(davinci_emif_regs->nandfecc[ + ecc = __raw_readl(&(davinci_emif_regs->nandfecc[ CONFIG_SYS_NAND_CS - 2])); - val = __raw_readl(&davinci_emif_regs->nandfcr); - val |= DAVINCI_NANDFCR_NAND_ENABLE(CONFIG_SYS_NAND_CS); - val |= DAVINCI_NANDFCR_1BIT_ECC_START(CONFIG_SYS_NAND_CS); - __raw_writel(val, &davinci_emif_regs->nandfcr); + return ecc; } -static u_int32_t nand_davinci_readecc(struct mtd_info *mtd, u_int32_t region) +static void nand_davinci_enable_hwecc(struct mtd_info *mtd, int mode) { - u_int32_t ecc = 0; + u_int32_t val; - ecc = __raw_readl(&(davinci_emif_regs->nandfecc[region - 1])); + /* reading the ECC result register resets the ECC calculation */ + nand_davinci_readecc(mtd); - return ecc; + val = __raw_readl(&davinci_emif_regs->nandfcr); + val |= DAVINCI_NANDFCR_NAND_ENABLE(CONFIG_SYS_NAND_CS); + val |= DAVINCI_NANDFCR_1BIT_ECC_START(CONFIG_SYS_NAND_CS); + __raw_writel(val, &davinci_emif_regs->nandfcr); } static int nand_davinci_calculate_ecc(struct mtd_info *mtd, const u_char *dat, u_char *ecc_code) { u_int32_t tmp; - const int region = 1; - tmp = nand_davinci_readecc(mtd, region); + tmp = nand_davinci_readecc(mtd); /* Squeeze 4 bytes ECC into 3 bytes by removing RESERVED bits * and shifting. RESERVED bits are 31 to 28 and 15 to 12. */ |