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mtd: rawnand: Add Macronix NAND read retry support 

Add support for Macronix NAND read retry.

Macronix NANDs support specific read operation for data recovery,
which can be enabled with a SET_FEATURE.
Driver checks byte 167 of Vendor Blocks in ONFI parameter page table
to see if this high-reliability function is supported.

Signed-off-by: Mason Yang <masonccyang@mxic.com.tw>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
This commit is contained in:
Mason Yang 2019-06-03 10:42:04 +08:00 committed by Miquel Raynal
parent db01077c5f
commit 33535b8547
1 changed files with 45 additions and 0 deletions
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45
drivers/mtd/nand/raw/nand_macronix.c
View File

@ -8,6 +8,50 @@
#include "internals.h"
#define MACRONIX_READ_RETRY_BIT BIT(0)
#define MACRONIX_NUM_READ_RETRY_MODES 6
struct nand_onfi_vendor_macronix {
u8 reserved;
u8 reliability_func;
} __packed;
static int macronix_nand_setup_read_retry(struct nand_chip *chip, int mode)
{
u8 feature[ONFI_SUBFEATURE_PARAM_LEN];
if (!chip->parameters.supports_set_get_features ||
!test_bit(ONFI_FEATURE_ADDR_READ_RETRY,
chip->parameters.set_feature_list))
return -ENOTSUPP;
feature[0] = mode;
return nand_set_features(chip, ONFI_FEATURE_ADDR_READ_RETRY, feature);
}
static void macronix_nand_onfi_init(struct nand_chip *chip)
{
struct nand_parameters *p = &chip->parameters;
struct nand_onfi_vendor_macronix *mxic;
if (!p->onfi)
return;
mxic = (struct nand_onfi_vendor_macronix *)p->onfi->vendor;
if ((mxic->reliability_func & MACRONIX_READ_RETRY_BIT) == 0)
return;
chip->read_retries = MACRONIX_NUM_READ_RETRY_MODES;
chip->setup_read_retry = macronix_nand_setup_read_retry;
if (p->supports_set_get_features) {
bitmap_set(p->set_feature_list,
ONFI_FEATURE_ADDR_READ_RETRY, 1);
bitmap_set(p->get_feature_list,
ONFI_FEATURE_ADDR_READ_RETRY, 1);
}
}
/*
* Macronix AC series does not support using SET/GET_FEATURES to change
* the timings unlike what is declared in the parameter page. Unflag
@ -56,6 +100,7 @@ static int macronix_nand_init(struct nand_chip *chip)
chip->options |= NAND_BBM_FIRSTPAGE | NAND_BBM_SECONDPAGE;
macronix_nand_fix_broken_get_timings(chip);
macronix_nand_onfi_init(chip);
return 0;
}