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_NAND_ECC_BCH)
18
mtd_nand_has_bch(void)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_NAND_ECC_BCH */
44
mtd_nand_has_bch(void)45 static inline int mtd_nand_has_bch(void) { return 0; }
46
47 static inline int
nand_bch_calculate_ecc(struct mtd_info * mtd,const u_char * dat,u_char * ecc_code)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
nand_bch_correct_data(struct mtd_info * mtd,unsigned char * buf,unsigned char * read_ecc,unsigned char * calc_ecc)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 *
nand_bch_init(struct mtd_info * mtd,unsigned int eccsize,unsigned int eccbytes,struct nand_ecclayout ** ecclayout)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
nand_bch_free(struct nand_bch_control * nbc)68 static inline void nand_bch_free(struct nand_bch_control *nbc) {}
69
70 #endif /* CONFIG_NAND_ECC_BCH */
71
72 #endif /* __MTD_NAND_BCH_H__ */
73