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mtd: atmel_nand: use minimum ecc requirements of nand: ecc_{strength,step}_ds

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Since ecc_{strength,step}_ds is introduced in nand_chip structure for
minimum ecc requirements. So we can use them directly and remove our
own get_onfi_ecc_param function.

Signed-off-by: Josh Wu <josh.wu@atmel.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
This commit is contained in:
Josh Wu 2013-09-18 13:58:48 +08:00 committed by Brian Norris
parent 81f29b475d
commit 2a3d933a46
1 changed files with 9 additions and 37 deletions
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46
drivers/mtd/nand/atmel_nand.c
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@ -1062,56 +1062,28 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
}
/*
* Get ECC requirement in ONFI parameters, returns -1 if ONFI
* parameters is not supported.
* return 0 if success to get the ECC requirement.
*/
static int get_onfi_ecc_param(struct nand_chip *chip,
int *ecc_bits, int *sector_size)
{
*ecc_bits = *sector_size = 0;
if (chip->onfi_params.ecc_bits == 0xff)
/* TODO: the sector_size and ecc_bits need to be find in
* extended ecc parameter, currently we don't support it.
*/
return -1;
*ecc_bits = chip->onfi_params.ecc_bits;
/* The default sector size (ecc codeword size) is 512 */
*sector_size = 512;
return 0;
}
/*
* Get ecc requirement from ONFI parameters ecc requirement.
* Get minimum ecc requirements from NAND.
* If pmecc-cap, pmecc-sector-size in DTS are not specified, this function
* will set them according to ONFI ecc requirement. Otherwise, use the
* will set them according to minimum ecc requirement. Otherwise, use the
* value in DTS file.
* return 0 if success. otherwise return error code.
*/
static int pmecc_choose_ecc(struct atmel_nand_host *host,
int *cap, int *sector_size)
{
/* Get ECC requirement from ONFI parameters */
*cap = *sector_size = 0;
if (host->nand_chip.onfi_version) {
if (!get_onfi_ecc_param(&host->nand_chip, cap, sector_size))
dev_info(host->dev, "ONFI params, minimum required ECC: %d bits in %d bytes\n",
/* Get minimum ECC requirements */
if (host->nand_chip.ecc_strength_ds) {
*cap = host->nand_chip.ecc_strength_ds;
*sector_size = host->nand_chip.ecc_step_ds;
dev_info(host->dev, "minimum ECC: %d bits in %d bytes\n",
*cap, *sector_size);
else
dev_info(host->dev, "NAND chip ECC reqirement is in Extended ONFI parameter, we don't support yet.\n");
} else {
dev_info(host->dev, "NAND chip is not ONFI compliant, assume ecc_bits is 2 in 512 bytes");
}
if (*cap == 0 && *sector_size == 0) {
*cap = 2;
*sector_size = 512;
dev_info(host->dev, "can't detect min. ECC, assume 2 bits in 512 bytes\n");
}
/* If dts file doesn't specify then use the one in ONFI parameters */
/* If device tree doesn't specify, use NAND's minimum ECC parameters */
if (host->pmecc_corr_cap == 0) {
/* use the most fitable ecc bits (the near bigger one ) */
if (*cap <= 2)