diff options
Diffstat (limited to 'drivers/mtd/nand/mxs_nand.c')
| -rw-r--r-- | drivers/mtd/nand/mxs_nand.c | 30 |
1 files changed, 12 insertions, 18 deletions
diff --git a/drivers/mtd/nand/mxs_nand.c b/drivers/mtd/nand/mxs_nand.c index 2d2b938..fc5cf58 100644 --- a/drivers/mtd/nand/mxs_nand.c +++ b/drivers/mtd/nand/mxs_nand.c @@ -146,26 +146,20 @@ static uint32_t mxs_nand_aux_status_offset(void) static inline uint32_t mxs_nand_get_ecc_strength(uint32_t page_data_size, uint32_t page_oob_size) { - if (page_data_size == 2048) { - if (page_oob_size == 64) - return 8; + int ecc_strength; - if (page_oob_size == 112) - return 14; - } - - if (page_data_size == 4096) { - if (page_oob_size == 128) - return 8; - - if (page_oob_size == 218) - return 16; - - if (page_oob_size == 224) - return 16; - } + /* + * Determine the ECC layout with the formula: + * ECC bits per chunk = (total page spare data bits) / + * (bits per ECC level) / (chunks per page) + * where: + * total page spare data bits = + * (page oob size - meta data size) * (bits per byte) + */ + ecc_strength = ((page_oob_size - MXS_NAND_METADATA_SIZE) * 8) + / (13 * mxs_nand_ecc_chunk_cnt(page_data_size)); - return 0; + return round_down(ecc_strength, 2); } static inline uint32_t mxs_nand_get_mark_offset(uint32_t page_data_size, |