diff options
Diffstat (limited to 'drivers/mtd')
| -rw-r--r-- | drivers/mtd/nand/mxc_nand.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/mtd/nand/mxc_nand.c b/drivers/mtd/nand/mxc_nand.c index f5fd254..1433a83 100644 --- a/drivers/mtd/nand/mxc_nand.c +++ b/drivers/mtd/nand/mxc_nand.c @@ -58,6 +58,7 @@ #define NFC_V1_V2_CONFIG1 (host->regs + 0x1a) #define NFC_V1_V2_CONFIG2 (host->regs + 0x1c) +#define NFC_V2_CONFIG1_ECC_MODE_4 (1 << 0) #define NFC_V1_V2_CONFIG1_SP_EN (1 << 2) #define NFC_V1_V2_CONFIG1_ECC_EN (1 << 3) #define NFC_V1_V2_CONFIG1_INT_MSK (1 << 4) @@ -581,6 +582,23 @@ static void mxc_do_addr_cycle(struct mtd_info *mtd, int column, int page_addr) } } +/* + * v2 and v3 type controllers can do 4bit or 8bit ecc depending + * on how much oob the nand chip has. For 8bit ecc we need at least + * 26 bytes of oob data per 512 byte block. + */ +static int get_eccsize(struct mtd_info *mtd) +{ + int oobbytes_per_512 = 0; + + oobbytes_per_512 = mtd->oobsize * 512 / mtd->writesize; + + if (oobbytes_per_512 < 26) + return 4; + else + return 8; +} + static void preset_v1_v2(struct mtd_info *mtd) { struct nand_chip *nand_chip = mtd->priv; @@ -596,6 +614,15 @@ static void preset_v1_v2(struct mtd_info *mtd) } else { tmp &= ~NFC_V1_V2_CONFIG1_ECC_EN; } + + if (nfc_is_v21() && mtd->writesize) { + host->eccsize = get_eccsize(mtd); + if (host->eccsize == 4) + tmp |= NFC_V2_CONFIG1_ECC_MODE_4; + } else { + host->eccsize = 1; + } + writew(tmp, NFC_V1_V2_CONFIG1); /* preset operation */ @@ -859,6 +886,9 @@ static int __init mxcnd_probe(struct platform_device *pdev) goto escan; } + /* Call preset again, with correct writesize this time */ + host->preset(mtd); + if (mtd->writesize == 2048) this->ecc.layout = oob_largepage; |