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 *
  36 nand_bch_init(struct mtd_info *mtd, unsigned int eccsize,
  37               unsigned int eccbytes, struct nand_ecclayout **ecclayout);
  38 /*
  39  * Release BCH encoder/decoder resources
  40  */
  41 void nand_bch_free(struct nand_bch_control *nbc);
  42
  43 #else /* !CONFIG_MTD_NAND_ECC_BCH */
  44
  45 static inline int mtd_nand_has_bch(void) { return 0; }
  46
  47 static inline int
  48 nand_bch_calculate_ecc(struct mtd_info *mtd, const u_char *dat,
  49                        u_char *ecc_code)
  50 {
  51         return -1;
  52 }
  53
  54 static inline int
  55 nand_bch_correct_data(struct mtd_info *mtd, unsigned char *buf,
  56                       unsigned char *read_ecc, unsigned char *calc_ecc)
  57 {
  58         return -1;
  59 }
  60
  61 static inline struct nand_bch_control *
  62 nand_bch_init(struct mtd_info *mtd, unsigned int eccsize,
  63               unsigned int eccbytes, struct nand_ecclayout **ecclayout)
  64 {
  65         return NULL;
  66 }
  67
  68 static inline void nand_bch_free(struct nand_bch_control *nbc) {}
  69
  70 #endif /* CONFIG_MTD_NAND_ECC_BCH */
  71
  72 #endif /* __MTD_NAND_BCH_H__ */