include/linux/mtd/nand_bch.h

   1 /*
   2  * Copyright © 2011 Ivan Djelic <ivan.djelic@parrot.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  *
   8  * This file is the header for the NAND BCH ECC implementation.
   9  */
  10
  11 #ifndef __MTD_NAND_BCH_H__
  12 #define __MTD_NAND_BCH_H__
  13
  14 struct mtd_info;
  15 struct nand_bch_control;
  16
  17 #if defined(CONFIG_MTD_NAND_ECC_BCH)
  18
  19 static inline int mtd_nand_has_bch(void) { return 1; }
  20
  21 /*
  22  * Calculate BCH ecc code
  23  */
  24 int nand_bch_calculate_ecc(struct mtd_info *mtd, const u_char *dat,
  25                            u_char *ecc_code);
  26
  27 /*
  28  * Detect and correct bit errors
  29  */
  30 int nand_bch_correct_data(struct mtd_info *mtd, u_char *dat, u_char *read_ecc,
  31                           u_char *calc_ecc);
  32 /*
  33  * Initialize BCH encoder/decoder
  34  */
  35 struct nand_bch_control *nand_bch_init(struct mtd_info *mtd);
  36 /*
  37  * Release BCH encoder/decoder resources
  38  */
  39 void nand_bch_free(struct nand_bch_control *nbc);
  40
  41 #else /* !CONFIG_MTD_NAND_ECC_BCH */
  42
  43 static inline int mtd_nand_has_bch(void) { return 0; }
  44
  45 static inline int
  46 nand_bch_calculate_ecc(struct mtd_info *mtd, const u_char *dat,
  47                        u_char *ecc_code)
  48 {
  49         return -1;
  50 }
  51
  52 static inline int
  53 nand_bch_correct_data(struct mtd_info *mtd, unsigned char *buf,
  54                       unsigned char *read_ecc, unsigned char *calc_ecc)
  55 {
  56         return -ENOTSUPP;
  57 }
  58
  59 static inline struct nand_bch_control *nand_bch_init(struct mtd_info *mtd)
  60 {
  61         return NULL;
  62 }
  63
  64 static inline void nand_bch_free(struct nand_bch_control *nbc) {}
  65
  66 #endif /* CONFIG_MTD_NAND_ECC_BCH */
  67
  68 #endif /* __MTD_NAND_BCH_H__ */