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author | Lars-Peter Clausen <lars@metafoo.de> | 2010-02-26 18:09:12 +0000 |
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committer | Lars-Peter Clausen <lars@metafoo.de> | 2010-02-26 18:09:12 +0000 |
commit | 87298f0de2bf3cfb615c0e6cdeefee58b0534707 (patch) | |
tree | c0bb5e3715fbb67f1592c08e394922597c608f0e /target/linux/xburst/files-2.6.32/drivers | |
parent | de8394cc11c4f5dec1c94ee4f89a350fddcf44c2 (diff) | |
download | master-31e0f0ae-87298f0de2bf3cfb615c0e6cdeefee58b0534707.tar.gz master-31e0f0ae-87298f0de2bf3cfb615c0e6cdeefee58b0534707.tar.bz2 master-31e0f0ae-87298f0de2bf3cfb615c0e6cdeefee58b0534707.zip |
jz4740_nand: * Use NAND_ECC_HW_OOB_FIRST mode instead of a patched NAND_ECC_HW * Fix subpage writing * speed up reading
SVN-Revision: 19875
Diffstat (limited to 'target/linux/xburst/files-2.6.32/drivers')
-rw-r--r-- | target/linux/xburst/files-2.6.32/drivers/mtd/nand/jz4740_nand.c | 65 |
1 files changed, 44 insertions, 21 deletions
diff --git a/target/linux/xburst/files-2.6.32/drivers/mtd/nand/jz4740_nand.c b/target/linux/xburst/files-2.6.32/drivers/mtd/nand/jz4740_nand.c index d1e38184fa..abe0caa86f 100644 --- a/target/linux/xburst/files-2.6.32/drivers/mtd/nand/jz4740_nand.c +++ b/target/linux/xburst/files-2.6.32/drivers/mtd/nand/jz4740_nand.c @@ -60,6 +60,7 @@ struct jz_nand { struct resource *mem; struct jz_nand_platform_data *pdata; + bool is_reading; }; static inline struct jz_nand *mtd_to_jz_nand(struct mtd_info *mtd) @@ -115,9 +116,11 @@ static void jz_nand_hwctl(struct mtd_info *mtd, int mode) switch(mode) { case NAND_ECC_READ: reg &= ~JZ_NAND_ECC_CTRL_ENCODING; + nand->is_reading = true; break; case NAND_ECC_WRITE: reg |= JZ_NAND_ECC_CTRL_ENCODING; + nand->is_reading = false; break; default: break; @@ -126,12 +129,17 @@ static void jz_nand_hwctl(struct mtd_info *mtd, int mode) writel(reg, nand->base + JZ_REG_NAND_ECC_CTRL); } + static int jz_nand_calculate_ecc_rs(struct mtd_info* mtd, const uint8_t* dat, uint8_t *ecc_code) { struct jz_nand *nand = mtd_to_jz_nand(mtd); uint32_t reg, status; int i; + static uint8_t all_ff_ecc[] = {0xcd, 0x9d, 0x90, 0x58, 0xf4, 0x8b, 0xff, 0xb7, 0x6f}; + + if (nand->is_reading) + return 0; do { status = readl(nand->base + JZ_REG_NAND_IRQ_STAT); @@ -145,27 +153,36 @@ static int jz_nand_calculate_ecc_rs(struct mtd_info* mtd, const uint8_t* dat, ecc_code[i] = readb(nand->base + JZ_REG_NAND_PAR0 + i); } + /* If the written data is completly 0xff, we also want to write 0xff as + * ecc, otherwise we will get in trouble when doing subpage writes. */ + if (memcmp(ecc_code, all_ff_ecc, 9) == 0) { + memset(ecc_code, 0xff, 9); + } + return 0; } +/*#define printkd printk*/ +#define printkd(...) + static void correct_data(uint8_t *dat, int index, int mask) { int offset = index & 0x7; uint16_t data; - printk("correct: "); + printkd("correct: "); index += (index >> 3); data = dat[index]; data |= dat[index+1] << 8; - printk("0x%x -> ", data); + printkd("0x%x -> ", data); mask ^= (data >> offset) & 0x1ff; data &= ~(0x1ff << offset); data |= (mask << offset); - printk("0x%x\n", data); + printkd("0x%x\n", data); dat[index] = data & 0xff; dat[index+1] = (data >> 8) & 0xff; @@ -177,18 +194,24 @@ static int jz_nand_correct_ecc_rs(struct mtd_info* mtd, uint8_t *dat, struct jz_nand *nand = mtd_to_jz_nand(mtd); int i, error_count, index; uint32_t reg, status, error; + uint32_t t; - for(i = 0; i < 9; ++i) { - if (read_ecc[i] != 0xff) - break; - } - if (i == 9) { - for (i = 0; i < nand->chip.ecc.size; ++i) { - if (dat[i] != 0xff) - break; + t = read_ecc[0]; + + if (t == 0xff) { + for (i = 1; i < 9; ++i) + t &= read_ecc[i]; + + t &= dat[0]; + t &= dat[nand->chip.ecc.size / 2]; + t &= dat[nand->chip.ecc.size - 1]; + + if (t == 0xff) { + for (i = 1; i < nand->chip.ecc.size - 1; ++i) + t &= dat[i]; + if (t == 0xff) + return 0; } - if (i == nand->chip.ecc.size) - return 0; } for(i = 0; i < 9; ++i) @@ -208,20 +231,20 @@ static int jz_nand_correct_ecc_rs(struct mtd_info* mtd, uint8_t *dat, if (status & JZ_NAND_STATUS_ERROR) { if (status & JZ_NAND_STATUS_UNCOR_ERROR) { - printk("uncorrectable ecc:"); + printkd("uncorrectable ecc:"); for(i = 0; i < 9; ++i) - printk(" 0x%x", read_ecc[i]); - printk("\n"); - printk("uncorrectable data:"); + printkd(" 0x%x", read_ecc[i]); + printkd("\n"); + printkd("uncorrectable data:"); for(i = 0; i < 32; ++i) - printk(" 0x%x", dat[i]); - printk("\n"); + printkd(" 0x%x", dat[i]); + printkd("\n"); return -1; } error_count = (status & JZ_NAND_STATUS_ERR_COUNT) >> 29; - printk("error_count: %d %x\n", error_count, status); + printkd("error_count: %d %x\n", error_count, status); for(i = 0; i < error_count; ++i) { error = readl(nand->base + JZ_REG_NAND_ERR(i)); @@ -304,7 +327,7 @@ static int __devinit jz_nand_probe(struct platform_device *pdev) chip->ecc.calculate = jz_nand_calculate_ecc_rs; chip->ecc.correct = jz_nand_correct_ecc_rs; - chip->ecc.mode = NAND_ECC_HW; + chip->ecc.mode = NAND_ECC_HW_OOB_FIRST; chip->ecc.size = 512; chip->ecc.bytes = 9; if (pdata) |