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_chip;
  16 struct nand_bch_control;
  17
  18 #if IS_ENABLED(CONFIG_MTD_NAND_ECC_SW_BCH)
  19
  20 static inline int mtd_nand_has_bch(void) { return 1; }
  21
  22 /*
  23  * Calculate BCH ecc code
  24  */
  25 int nand_bch_calculate_ecc(struct nand_chip *chip, const u_char *dat,
  26                            u_char *ecc_code);
  27
  28 /*
  29  * Detect and correct bit errors
  30  */
  31 int nand_bch_correct_data(struct nand_chip *chip, u_char *dat,
  32                           u_char *read_ecc, u_char *calc_ecc);
  33 /*
  34  * Initialize BCH encoder/decoder
  35  */
  36 struct nand_bch_control *nand_bch_init(struct mtd_info *mtd);
  37 /*
  38  * Release BCH encoder/decoder resources
  39  */
  40 void nand_bch_free(struct nand_bch_control *nbc);
  41
  42 #else /* !CONFIG_MTD_NAND_ECC_SW_BCH */
  43
  44 static inline int mtd_nand_has_bch(void) { return 0; }
  45
  46 static inline int
  47 nand_bch_calculate_ecc(struct nand_chip *chip, const u_char *dat,
  48                        u_char *ecc_code)
  49 {
  50         return -1;
  51 }
  52
  53 static inline int
  54 nand_bch_correct_data(struct nand_chip *chip, unsigned char *buf,
  55                       unsigned char *read_ecc, unsigned char *calc_ecc)
  56 {
  57         return -ENOTSUPP;
  58 }
  59
  60 static inline struct nand_bch_control *nand_bch_init(struct mtd_info *mtd)
  61 {
  62         return NULL;
  63 }
  64
  65 static inline void nand_bch_free(struct nand_bch_control *nbc) {}
  66
  67 #endif /* CONFIG_MTD_NAND_ECC_SW_BCH */
  68
  69 #endif /* __MTD_NAND_BCH_H__ */