linux_kernel/include/linux/mtd/nand_bch.h

/*
 * 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_chip;
struct nand_bch_control;

#if defined(CONFIG_MTD_NAND_ECC_BCH)

static inline int mtd_nand_has_bch(void) { return 1; }

/*
 * Calculate BCH ecc code
 */
int nand_bch_calculate_ecc(struct nand_chip *chip, const u_char *dat,
			   u_char *ecc_code);

/*
 * Detect and correct bit errors
 */
int nand_bch_correct_data(struct nand_chip *chip, 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);
/*
 * Release BCH encoder/decoder resources
 */
void nand_bch_free(struct nand_bch_control *nbc);

#else /* !CONFIG_MTD_NAND_ECC_BCH */

static inline int mtd_nand_has_bch(void) { return 0; }

static inline int
nand_bch_calculate_ecc(struct nand_chip *chip, const u_char *dat,
		       u_char *ecc_code)
{
	return -1;
}

static inline int
nand_bch_correct_data(struct nand_chip *chip, unsigned char *buf,
		      unsigned char *read_ecc, unsigned char *calc_ecc)
{
	return -ENOTSUPP;
}

static inline struct nand_bch_control *nand_bch_init(struct mtd_info *mtd)
{
	return NULL;
}

static inline void nand_bch_free(struct nand_bch_control *nbc) {}

#endif /* CONFIG_MTD_NAND_ECC_BCH */

#endif /* __MTD_NAND_BCH_H__ */