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authorArmando Visconti <armando.visconti@st.com>2012-03-07 17:00:54 +0530
committerDavid Woodhouse <David.Woodhouse@intel.com>2012-03-27 00:48:06 +0100
commit753e0139e5569946056a8d5960111665a7f8f6f1 (patch)
tree53d2f38c02513638e4b83171c4f835e8e3302c82
parenta612c2ae483ee7e4d40c31d5374edf8a8b025f2a (diff)
mtd: fsmc: Improve the fsmc_correct_data() routine
This patch improves the error correction routine for bch8 - Loop only up to number of errors detected - Improve the error index calculation procedure Additionally, it also renames the "correct" routine to indicate that it is bch8 specific Signed-off-by: Armando Visconti <armando.visconti@st.com> Signed-off-by: Vipin Kumar <vipin.kumar@st.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
-rw-r--r--drivers/mtd/nand/fsmc_nand.c38
1 files changed, 17 insertions, 21 deletions
diff --git a/drivers/mtd/nand/fsmc_nand.c b/drivers/mtd/nand/fsmc_nand.c
index cfe15a6f29d..5b217f2a31b 100644
--- a/drivers/mtd/nand/fsmc_nand.c
+++ b/drivers/mtd/nand/fsmc_nand.c
@@ -587,7 +587,7 @@ static int fsmc_read_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
}
/*
- * fsmc_correct_data
+ * fsmc_bch8_correct_data
* @mtd: mtd info structure
* @dat: buffer of read data
* @read_ecc: ecc read from device spare area
@@ -596,7 +596,7 @@ static int fsmc_read_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
* calc_ecc is a 104 bit information containing maximum of 8 error
* offset informations of 13 bits each in 512 bytes of read data.
*/
-static int fsmc_correct_data(struct mtd_info *mtd, uint8_t *dat,
+static int fsmc_bch8_correct_data(struct mtd_info *mtd, uint8_t *dat,
uint8_t *read_ecc, uint8_t *calc_ecc)
{
struct fsmc_nand_data *host = container_of(mtd,
@@ -605,8 +605,8 @@ static int fsmc_correct_data(struct mtd_info *mtd, uint8_t *dat,
struct fsmc_regs *regs = host->regs_va;
unsigned int bank = host->bank;
uint32_t err_idx[8];
- uint64_t ecc_data[2];
uint32_t num_err, i;
+ uint32_t ecc1, ecc2, ecc3, ecc4;
num_err = (readl(&regs->bank_regs[bank].sts) >> 10) & 0xF;
@@ -642,9 +642,6 @@ static int fsmc_correct_data(struct mtd_info *mtd, uint8_t *dat,
return -EBADMSG;
}
- /* The calculated ecc is actually the correction index in data */
- memcpy(ecc_data, calc_ecc, chip->ecc.bytes);
-
/*
* ------------------- calc_ecc[] bit wise -----------|--13 bits--|
* |---idx[7]--|--.....-----|---idx[2]--||---idx[1]--||---idx[0]--|
@@ -654,20 +651,19 @@ static int fsmc_correct_data(struct mtd_info *mtd, uint8_t *dat,
* uint64_t array and error offset indexes are populated in err_idx
* array
*/
- for (i = 0; i < 8; i++) {
- if (i == 4) {
- err_idx[4] = ((ecc_data[1] & 0x1) << 12) | ecc_data[0];
- ecc_data[1] >>= 1;
- continue;
- }
- err_idx[i] = (ecc_data[i/4] & 0x1FFF);
- ecc_data[i/4] >>= 13;
- }
-
- num_err = (readl(&regs->bank_regs[bank].sts) >> 10) & 0xF;
-
- if (num_err == 0xF)
- return -EBADMSG;
+ ecc1 = readl(&regs->bank_regs[bank].ecc1);
+ ecc2 = readl(&regs->bank_regs[bank].ecc2);
+ ecc3 = readl(&regs->bank_regs[bank].ecc3);
+ ecc4 = readl(&regs->bank_regs[bank].sts);
+
+ err_idx[0] = (ecc1 >> 0) & 0x1FFF;
+ err_idx[1] = (ecc1 >> 13) & 0x1FFF;
+ err_idx[2] = (((ecc2 >> 0) & 0x7F) << 6) | ((ecc1 >> 26) & 0x3F);
+ err_idx[3] = (ecc2 >> 7) & 0x1FFF;
+ err_idx[4] = (((ecc3 >> 0) & 0x1) << 12) | ((ecc2 >> 20) & 0xFFF);
+ err_idx[5] = (ecc3 >> 1) & 0x1FFF;
+ err_idx[6] = (ecc3 >> 14) & 0x1FFF;
+ err_idx[7] = (((ecc4 >> 16) & 0xFF) << 5) | ((ecc3 >> 27) & 0x1F);
i = 0;
while (num_err--) {
@@ -829,7 +825,7 @@ static int __init fsmc_nand_probe(struct platform_device *pdev)
if (AMBA_REV_BITS(host->pid) >= 8) {
nand->ecc.read_page = fsmc_read_page_hwecc;
nand->ecc.calculate = fsmc_read_hwecc_ecc4;
- nand->ecc.correct = fsmc_correct_data;
+ nand->ecc.correct = fsmc_bch8_correct_data;
nand->ecc.bytes = 13;
} else {
nand->ecc.calculate = fsmc_read_hwecc_ecc1;