From: Jiang Lu <lu.ji...@windriver.com>
On ACP34xx, remounting a jffs2 partition will fail after writing file
with following error:
mount:/dev/mtdblock6 can't read superblock
This is caused by involving EP501G1_NAND_BCH_STATUS to check HW ECC
result. This patch reads EP501G1_NAND_1BIT_ECC0_STATUS to check HW
ECC result. When EP501G1_NAND_BCH_STATUS returns non-zero value,
EP501G1_NAND_1BIT_ECC0_STATUS reads zero, it indicate no HW ECC error.
Extract from vendor drop patch lsi-patch 3.8.1.12.
Signed-off-by: Jiang Lu <lu.ji...@windriver.com>
---
drivers/mtd/nand/lsi_acp_nand.c | 104 +++++++---------------------------------
1 file changed, 16 insertions(+), 88 deletions(-)
diff --git a/drivers/mtd/nand/lsi_acp_nand.c b/drivers/mtd/nand/lsi_acp_nand.c
index 94b8e3c..eb9943a 100644
--- a/drivers/mtd/nand/lsi_acp_nand.c
+++ b/drivers/mtd/nand/lsi_acp_nand.c
@@ -2820,100 +2820,28 @@ static int
report_ecc_errors_ep501g1(struct mtd_info *mtd, struct nand_chip *chip,
uint8_t *buffer, int page)
{
- unsigned long bch_status;
- int rc = 0;
+ unsigned long ecc_status;
int i;
- int is_blank = 1;
- uint8_t *data = buffer;
- int section;
- int syndrome;
- unsigned long syndromes[8][8];
-
- /* If there are no errors, return. */
- bch_status = READL(chip->IO_ADDR_R + EP501G1_NAND_BCH_STATUS);
- if (0 == bch_status)
- goto report_ecc_errors_ep501g1_end;
+ for (i = 0; i < (mtd->writesize / 1024); ++i) {
+ ecc_status = readl(chip->IO_ADDR_R +
+ EP501G1_NAND_1BIT_ECC0_STATUS + (i * 4));
- switch (mtd->writesize) {
- case 512:
- bch_status &= 0x1;
- break;
- case 2048:
- bch_status &= 0xf;
- break;
- case 4096:
- bch_status &= 0xff;
- break;
- default:
- printk(KERN_ERR "Unexpected Page Size!\n");
- rc = -1;
- goto report_ecc_errors_ep501g1_end;
- break;
- }
-
- /* Ignore fully erased blocks. */
- if (NULL != data) {
- for (i = 0; i < mtd->writesize; ++i) {
- if (0xff != *data++) {
- is_blank = 0;
- break;
- }
- }
- }
-
- if (0 != is_blank)
- goto report_ecc_errors_ep501g1_end;
-
- /* Read the syndrome registers and split them into syndromes. */
- for (section = 0; section < 8; ++section) {
- unsigned long address;
- unsigned long value;
-
- address = EP501G1_NAND_SYN_R12_S0 + (section * 0x10);
-
- for (syndrome = 0; syndrome < 8; syndrome += 2) {
- value = READL(chip->IO_ADDR_R + address +
- (syndrome * 2));
- syndromes[section][syndrome] =
- (value & 0x1fff);
- syndromes[section][syndrome + 1] =
- ((value & 0x1fff0000) >> 16);
- }
- }
-
-#ifdef NOT_USED
- /* Debug output (BCH status register and syndromes). */
- printk(KERN_INFO "BCH Status Register: 0x%02lx\n", bch_status);
-
- for (section = 0; section < 8; ++section) {
- printk(KERN_INFO "Syndromes, Section %d: ", section);
-
- for (syndrome = 0; syndrome < 8; ++syndrome) {
- printk(KERN_INFO "0x%04lx ",
- syndromes[section][syndrome]);
- }
-
- printk(KERN_INFO "\n");
- }
-#endif
-
- for (i = 0; i < 4; ++i) {
- if ((1 << i) == (bch_status & (1 << i))) {
- rc = fix_section(((page * mtd->writesize) + (512 * i)),
- (void *)(buffer + (512 * i)),
- (int *)&syndromes[i]);
-
- if (-1 == rc)
- printk(KERN_ERR
- "Uncorrectable ECC Error: Page %d\n",
- page);
+ switch (ecc_status & (3 << 12)) {
+ case 01:
+ printk(KERN_ERR
+ "Correctable ECC Error: %d:0x%lx\n",
+ i, ecc_status);
+ break;
+ case 02:
+ printk(KERN_ERR
+ "Uncorrectable ECC Error: %d:0x%lx\n",
+ i, ecc_status);
+ break;
}
}
- report_ecc_errors_ep501g1_end:
-
- return rc;
+ return 0;
}
/*
--
1.8.3
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