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author | Christian Hitz <christian.hitz@aizo.com> | 2011-10-12 09:31:59 +0200 |
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committer | Scott Wood <scottwood@freescale.com> | 2012-01-26 16:09:02 -0600 |
commit | 4c6de8560cb42a6b6c2d565d41b6801e4b02d4b3 (patch) | |
tree | 1244963352384b2b50a920020bab7370918c303e /include/linux/mtd/nand_bch.h | |
parent | 4d2aee2b3681234691b102194cc2f14857272828 (diff) | |
download | u-boot-imx-4c6de8560cb42a6b6c2d565d41b6801e4b02d4b3.zip u-boot-imx-4c6de8560cb42a6b6c2d565d41b6801e4b02d4b3.tar.gz u-boot-imx-4c6de8560cb42a6b6c2d565d41b6801e4b02d4b3.tar.bz2 |
nand: Merge BCH code from Linux nand driver
[backport from linux commit 02f8c6aee8df3cdc935e9bdd4f2d020306035dbe]
This patch merges the BCH ECC algorithm from the 3.0 Linux kernel.
This enables U-Boot to support modern NAND flash chips that
require more than 1-bit of ECC in software.
Signed-off-by: Christian Hitz <christian.hitz@aizo.com>
Cc: Scott Wood <scottwood@freescale.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>
Diffstat (limited to 'include/linux/mtd/nand_bch.h')
-rw-r--r-- | include/linux/mtd/nand_bch.h | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/include/linux/mtd/nand_bch.h b/include/linux/mtd/nand_bch.h new file mode 100644 index 0000000..d8754dd --- /dev/null +++ b/include/linux/mtd/nand_bch.h @@ -0,0 +1,72 @@ +/* + * Copyright © 2011 Ivan Djelic <ivan.djelic@parrot.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This file is the header for the NAND BCH ECC implementation. + */ + +#ifndef __MTD_NAND_BCH_H__ +#define __MTD_NAND_BCH_H__ + +struct mtd_info; +struct nand_bch_control; + +#if defined(CONFIG_NAND_ECC_BCH) + +static inline int mtd_nand_has_bch(void) { return 1; } + +/* + * Calculate BCH ecc code + */ +int nand_bch_calculate_ecc(struct mtd_info *mtd, const u_char *dat, + u_char *ecc_code); + +/* + * Detect and correct bit errors + */ +int nand_bch_correct_data(struct mtd_info *mtd, u_char *dat, u_char *read_ecc, + u_char *calc_ecc); +/* + * Initialize BCH encoder/decoder + */ +struct nand_bch_control * +nand_bch_init(struct mtd_info *mtd, unsigned int eccsize, + unsigned int eccbytes, struct nand_ecclayout **ecclayout); +/* + * Release BCH encoder/decoder resources + */ +void nand_bch_free(struct nand_bch_control *nbc); + +#else /* !CONFIG_NAND_ECC_BCH */ + +static inline int mtd_nand_has_bch(void) { return 0; } + +static inline int +nand_bch_calculate_ecc(struct mtd_info *mtd, const u_char *dat, + u_char *ecc_code) +{ + return -1; +} + +static inline int +nand_bch_correct_data(struct mtd_info *mtd, unsigned char *buf, + unsigned char *read_ecc, unsigned char *calc_ecc) +{ + return -1; +} + +static inline struct nand_bch_control * +nand_bch_init(struct mtd_info *mtd, unsigned int eccsize, + unsigned int eccbytes, struct nand_ecclayout **ecclayout) +{ + return NULL; +} + +static inline void nand_bch_free(struct nand_bch_control *nbc) {} + +#endif /* CONFIG_NAND_ECC_BCH */ + +#endif /* __MTD_NAND_BCH_H__ */ |