[PATCH v3] mtd: atmel_nand: use minimum ecc requirements of nand: ecc_{strength, step}_ds
Josh Wu
josh.wu at atmel.com
Wed Sep 18 01:58:48 EDT 2013
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 at atmel.com>
---
v2 --> v3:
1. since ecc_{strength,step}_ds is non ONFI specific remove the check code:
'if (host->nand_chip.onfi_version)'
use 'if (host->nand_chip.ecc_strength_ds)' instead.
2. refined the commit message and change the comment since now we are not
ONFI specific.
v1 --> v2:
1. updated the refered commit id as it is changed when merged in mainline.
2. refined the commit message
drivers/mtd/nand/atmel_nand.c | 46 ++++++++---------------------------------
1 file changed, 9 insertions(+), 37 deletions(-)
diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
index 5a5d457..46e8794 100644
--- a/drivers/mtd/nand/atmel_nand.c
+++ b/drivers/mtd/nand/atmel_nand.c
@@ -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 requirements: %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, "cannot detect minimum ECC requirements, assume 2-bit correction per 512 bytes");
}
- /* If dts file doesn't specify then use the one in ONFI parameters */
+ /* If dts file doesn't specify then use the NAND's minimum ecc parameters */
if (host->pmecc_corr_cap == 0) {
/* use the most fitable ecc bits (the near bigger one ) */
if (*cap <= 2)
--
1.7.9.5
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