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nand: make 1-bit software ECC configurable

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The software ECC algorithm is not necessary when hardware ECC
is available and can be left out for a smaller image size.
Enable with CONFIG_MTD_ECC_SOFT.

Signed-off-by: Christian Hitz <christian.hitz@aizo.com>
Cc: Scott Wood <scottwood@freescale.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>
This commit is contained in:
Christian Hitz 2011-10-12 09:32:06 +02:00 committed by Scott Wood
parent 5454ddbc9b
commit 4fee6c2f29
3 changed files with 30 additions and 1 deletions
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2
drivers/mtd/nand/Makefile
View File

@ -39,7 +39,7 @@ COBJS-y += nand_bbt.o
COBJS-y += nand_ids.o
COBJS-y += nand_util.o
endif
COBJS-y += nand_ecc.o
COBJS-$(CONFIG_MTD_ECC_SOFT) += nand_ecc.o
COBJS-y += nand_base.o
COBJS-$(CONFIG_NAND_ECC_BCH) += nand_bch.o

4
drivers/mtd/nand/nand_base.c
View File

@ -3028,6 +3028,10 @@ int nand_scan_tail(struct mtd_info *mtd)
chip->ecc.mode = NAND_ECC_SOFT;
case NAND_ECC_SOFT:
if (!mtd_nand_has_ecc_soft()) {
printk(KERN_WARNING "CONFIG_MTD_ECC_SOFT not enabled\n");
return -EINVAL;
}
chip->ecc.calculate = nand_calculate_ecc;
chip->ecc.correct = nand_correct_data;
chip->ecc.read_page = nand_read_page_swecc;

25
include/linux/mtd/nand_ecc.h
View File

@ -15,6 +15,10 @@
struct mtd_info;
#if defined(CONFIG_MTD_ECC_SOFT)
static inline int mtd_nand_has_ecc_soft(void) { return 1; }
/*
* Calculate 3 byte ECC code for 256 byte block
*/
@ -25,4 +29,25 @@ int nand_calculate_ecc(struct mtd_info *mtd, const u_char *dat, u_char *ecc_code
*/
int nand_correct_data(struct mtd_info *mtd, u_char *dat, u_char *read_ecc, u_char *calc_ecc);
#else
static inline int mtd_nand_has_ecc_soft(void) { return 0; }
static inline int
nand_calculate_ecc(struct mtd_info *mtd, const u_char *dat, u_char *ecc_code)
{
return -1;
}
static inline int
nand_correct_data(struct mtd_info *mtd,
u_char *dat,
u_char *read_ecc,
u_char *calc_ecc)
{
return -1;
}
#endif
#endif /* __MTD_NAND_ECC_H__ */