diff options
Diffstat (limited to 'drivers/mtd')
| -rw-r--r-- | drivers/mtd/nand/denali.c | 52 | ||||
| -rw-r--r-- | drivers/mtd/nand/denali.h | 14 |
2 files changed, 57 insertions, 9 deletions
diff --git a/drivers/mtd/nand/denali.c b/drivers/mtd/nand/denali.c index 64a3bdcc6b04..b95e33a84201 100644 --- a/drivers/mtd/nand/denali.c +++ b/drivers/mtd/nand/denali.c @@ -856,6 +856,41 @@ static int denali_check_erased_page(struct mtd_info *mtd, return max_bitflips; } +static int denali_hw_ecc_fixup(struct mtd_info *mtd, + struct denali_nand_info *denali, + unsigned long *uncor_ecc_flags) +{ + struct nand_chip *chip = mtd_to_nand(mtd); + int bank = denali->flash_bank; + uint32_t ecc_cor; + unsigned int max_bitflips; + + ecc_cor = ioread32(denali->flash_reg + ECC_COR_INFO(bank)); + ecc_cor >>= ECC_COR_INFO__SHIFT(bank); + + if (ecc_cor & ECC_COR_INFO__UNCOR_ERR) { + /* + * This flag is set when uncorrectable error occurs at least in + * one ECC sector. We can not know "how many sectors", or + * "which sector(s)". We need erase-page check for all sectors. + */ + *uncor_ecc_flags = GENMASK(chip->ecc.steps - 1, 0); + return 0; + } + + max_bitflips = ecc_cor & ECC_COR_INFO__MAX_ERRORS; + + /* + * The register holds the maximum of per-sector corrected bitflips. + * This is suitable for the return value of the ->read_page() callback. + * Unfortunately, we can not know the total number of corrected bits in + * the page. Increase the stats by max_bitflips. (compromised solution) + */ + mtd->ecc_stats.corrected += max_bitflips; + + return max_bitflips; +} + #define ECC_SECTOR_SIZE 512 #define ECC_SECTOR(x) (((x) & ECC_ERROR_ADDRESS__SECTOR_NR) >> 12) @@ -865,8 +900,9 @@ static int denali_check_erased_page(struct mtd_info *mtd, #define ECC_ERR_DEVICE(x) (((x) & ERR_CORRECTION_INFO__DEVICE_NR) >> 8) #define ECC_LAST_ERR(x) ((x) & ERR_CORRECTION_INFO__LAST_ERR_INFO) -static int handle_ecc(struct mtd_info *mtd, struct denali_nand_info *denali, - uint8_t *buf, unsigned long *uncor_ecc_flags) +static int denali_sw_ecc_fixup(struct mtd_info *mtd, + struct denali_nand_info *denali, + unsigned long *uncor_ecc_flags, uint8_t *buf) { unsigned int bitflips = 0; unsigned int max_bitflips = 0; @@ -1070,12 +1106,12 @@ static int denali_read_page(struct mtd_info *mtd, struct nand_chip *chip, uint8_t *buf, int oob_required, int page) { struct denali_nand_info *denali = mtd_to_denali(mtd); - dma_addr_t addr = denali->buf.dma_buf; size_t size = mtd->writesize + mtd->oobsize; - uint32_t irq_status; - uint32_t irq_mask = INTR__ECC_TRANSACTION_DONE | INTR__ECC_ERR; + uint32_t irq_mask = denali->caps & DENALI_CAP_HW_ECC_FIXUP ? + INTR__DMA_CMD_COMP | INTR__ECC_UNCOR_ERR : + INTR__ECC_TRANSACTION_DONE | INTR__ECC_ERR; unsigned long uncor_ecc_flags = 0; int stat = 0; @@ -1101,8 +1137,10 @@ static int denali_read_page(struct mtd_info *mtd, struct nand_chip *chip, memcpy(buf, denali->buf.buf, mtd->writesize); - if (irq_status & INTR__ECC_ERR) - stat = handle_ecc(mtd, denali, buf, &uncor_ecc_flags); + if (denali->caps & DENALI_CAP_HW_ECC_FIXUP) + stat = denali_hw_ecc_fixup(mtd, denali, &uncor_ecc_flags); + else if (irq_status & INTR__ECC_ERR) + stat = denali_sw_ecc_fixup(mtd, denali, &uncor_ecc_flags, buf); denali_enable_dma(denali, false); if (stat < 0) diff --git a/drivers/mtd/nand/denali.h b/drivers/mtd/nand/denali.h index 483c0e988f33..e532956b7177 100644 --- a/drivers/mtd/nand/denali.h +++ b/drivers/mtd/nand/denali.h @@ -20,6 +20,7 @@ #ifndef __DENALI_H__ #define __DENALI_H__ +#include <linux/bitops.h> #include <linux/mtd/nand.h> #define DEVICE_RESET 0x0 @@ -218,8 +219,10 @@ #define INTR_STATUS(__bank) (0x410 + ((__bank) * 0x50)) #define INTR_EN(__bank) (0x420 + ((__bank) * 0x50)) -#define INTR__ECC_TRANSACTION_DONE 0x0001 -#define INTR__ECC_ERR 0x0002 +/* bit[1:0] is used differently depending on IP version */ +#define INTR__ECC_UNCOR_ERR 0x0001 /* new IP */ +#define INTR__ECC_TRANSACTION_DONE 0x0001 /* old IP */ +#define INTR__ECC_ERR 0x0002 /* old IP */ #define INTR__DMA_CMD_COMP 0x0004 #define INTR__TIME_OUT 0x0008 #define INTR__PROGRAM_FAIL 0x0010 @@ -259,6 +262,11 @@ #define ERR_CORRECTION_INFO__ERROR_TYPE 0x4000 #define ERR_CORRECTION_INFO__LAST_ERR_INFO 0x8000 +#define ECC_COR_INFO(bank) (0x650 + (bank) / 2 * 0x10) +#define ECC_COR_INFO__SHIFT(bank) ((bank) % 2 * 8) +#define ECC_COR_INFO__MAX_ERRORS 0x007f +#define ECC_COR_INFO__UNCOR_ERR 0x0080 + #define DMA_ENABLE 0x700 #define DMA_ENABLE__FLAG 0x0001 @@ -338,6 +346,8 @@ struct denali_nand_info { unsigned int caps; }; +#define DENALI_CAP_HW_ECC_FIXUP BIT(0) + extern int denali_init(struct denali_nand_info *denali); extern void denali_remove(struct denali_nand_info *denali); |