diff options
Diffstat (limited to 'drivers/mtd/nand/raw/nand_jedec.c')
| -rw-r--r-- | drivers/mtd/nand/raw/nand_jedec.c | 32 |
1 files changed, 21 insertions, 11 deletions
diff --git a/drivers/mtd/nand/raw/nand_jedec.c b/drivers/mtd/nand/raw/nand_jedec.c index 9b540e76f84f..b15c42f48755 100644 --- a/drivers/mtd/nand/raw/nand_jedec.c +++ b/drivers/mtd/nand/raw/nand_jedec.c @@ -16,6 +16,8 @@ #include "internals.h" +#define JEDEC_PARAM_PAGES 3 + /* * Check if the NAND chip is JEDEC compliant, returns 1 if it is, 0 otherwise. */ @@ -25,9 +27,11 @@ int nand_jedec_detect(struct nand_chip *chip) struct nand_memory_organization *memorg; struct nand_jedec_params *p; struct jedec_ecc_info *ecc; + bool use_datain = false; int jedec_version = 0; char id[5]; int i, val, ret; + u16 crc; memorg = nanddev_get_memorg(&chip->base); @@ -41,25 +45,31 @@ int nand_jedec_detect(struct nand_chip *chip) if (!p) return -ENOMEM; - ret = nand_read_param_page_op(chip, 0x40, NULL, 0); - if (ret) { - ret = 0; - goto free_jedec_param_page; - } - - for (i = 0; i < 3; i++) { - ret = nand_read_data_op(chip, p, sizeof(*p), true); + if (!nand_has_exec_op(chip) || + !nand_read_data_op(chip, p, sizeof(*p), true, true)) + use_datain = true; + + for (i = 0; i < JEDEC_PARAM_PAGES; i++) { + if (!i) + ret = nand_read_param_page_op(chip, 0x40, p, + sizeof(*p)); + else if (use_datain) + ret = nand_read_data_op(chip, p, sizeof(*p), true, + false); + else + ret = nand_change_read_column_op(chip, sizeof(*p) * i, + p, sizeof(*p), true); if (ret) { ret = 0; goto free_jedec_param_page; } - if (onfi_crc16(ONFI_CRC_BASE, (uint8_t *)p, 510) == - le16_to_cpu(p->crc)) + crc = onfi_crc16(ONFI_CRC_BASE, (u8 *)p, 510); + if (crc == le16_to_cpu(p->crc)) break; } - if (i == 3) { + if (i == JEDEC_PARAM_PAGES) { pr_err("Could not find valid JEDEC parameter page; aborting\n"); goto free_jedec_param_page; } |