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193bd40026
This patch adds software BCH ECC support to mtd, in order to handle recent NAND device ecc requirements (4 bits or more). It does so by adding a new ecc mode (NAND_ECC_SOFT_BCH) for use by board drivers, and a new Kconfig option to enable BCH support. It relies on the generic BCH library introduced in a previous patch. When a board driver uses mode NAND_ECC_SOFT_BCH, it should also set fields chip->ecc.size and chip->ecc.bytes to select BCH ecc data size and required error correction capability. See nand_bch_init() documentation for details. It has been tested on the following platforms using mtd-utils, UBI and UBIFS: x86 (with nandsim), arm926ejs. Signed-off-by: Ivan Djelic <ivan.djelic@parrot.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
73 lines
1.7 KiB
C
73 lines
1.7 KiB
C
/*
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* Copyright © 2011 Ivan Djelic <ivan.djelic@parrot.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This file is the header for the NAND BCH ECC implementation.
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*/
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#ifndef __MTD_NAND_BCH_H__
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#define __MTD_NAND_BCH_H__
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struct mtd_info;
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struct nand_bch_control;
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#if defined(CONFIG_MTD_NAND_ECC_BCH)
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static inline int mtd_nand_has_bch(void) { return 1; }
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/*
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* Calculate BCH ecc code
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*/
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int nand_bch_calculate_ecc(struct mtd_info *mtd, const u_char *dat,
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u_char *ecc_code);
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/*
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* Detect and correct bit errors
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*/
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int nand_bch_correct_data(struct mtd_info *mtd, u_char *dat, u_char *read_ecc,
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u_char *calc_ecc);
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/*
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* Initialize BCH encoder/decoder
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*/
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struct nand_bch_control *
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nand_bch_init(struct mtd_info *mtd, unsigned int eccsize,
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unsigned int eccbytes, struct nand_ecclayout **ecclayout);
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/*
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* Release BCH encoder/decoder resources
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*/
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void nand_bch_free(struct nand_bch_control *nbc);
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#else /* !CONFIG_MTD_NAND_ECC_BCH */
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static inline int mtd_nand_has_bch(void) { return 0; }
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static inline int
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nand_bch_calculate_ecc(struct mtd_info *mtd, const u_char *dat,
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u_char *ecc_code)
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{
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return -1;
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}
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static inline int
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nand_bch_correct_data(struct mtd_info *mtd, unsigned char *buf,
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unsigned char *read_ecc, unsigned char *calc_ecc)
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{
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return -1;
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}
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static inline struct nand_bch_control *
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nand_bch_init(struct mtd_info *mtd, unsigned int eccsize,
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unsigned int eccbytes, struct nand_ecclayout **ecclayout)
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{
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return NULL;
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}
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static inline void nand_bch_free(struct nand_bch_control *nbc) {}
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#endif /* CONFIG_MTD_NAND_ECC_BCH */
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#endif /* __MTD_NAND_BCH_H__ */
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