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mtd:mxs:nand calculate ecc strength dynamically

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Calculate ecc strength according oobsize, but not hardcoded
which is not aligned with kernel driver

Signed-off-by: Peng Fan <Peng.Fan@freescale.com>
Signed-off-by: Ye.Li <b37916@freescale.com>
Reviewed-by: Marek Vasut <marex@denx.de>
Signed-off-by: Jörg Krause <joerg.krause@embedded.rocks>
This commit is contained in:
Peng Fan 2015-04-15 09:27:21 +02:00 • committed by Scott Wood
parent 6b8583b0ad
commit bd38da1a55
1 changed files with 12 additions and 18 deletions
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30
drivers/mtd/nand/mxs_nand.c
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@ -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;
}
/*
* 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));
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;
}
return 0;
return round_down(ecc_strength, 2);
}
static inline uint32_t mxs_nand_get_mark_offset(uint32_t page_data_size,