1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * Copyright © 2011 Ivan Djelic <ivan.djelic@parrot.com>
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * This program is free software; you can redistribute it and/or modify
5*4882a593Smuzhiyun * it under the terms of the GNU General Public License version 2 as
6*4882a593Smuzhiyun * published by the Free Software Foundation.
7*4882a593Smuzhiyun *
8*4882a593Smuzhiyun * This file is the header for the NAND BCH ECC implementation.
9*4882a593Smuzhiyun */
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun #ifndef __MTD_NAND_BCH_H__
12*4882a593Smuzhiyun #define __MTD_NAND_BCH_H__
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun struct mtd_info;
15*4882a593Smuzhiyun struct nand_bch_control;
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun #if defined(CONFIG_NAND_ECC_BCH)
18*4882a593Smuzhiyun
mtd_nand_has_bch(void)19*4882a593Smuzhiyun static inline int mtd_nand_has_bch(void) { return 1; }
20*4882a593Smuzhiyun
21*4882a593Smuzhiyun /*
22*4882a593Smuzhiyun * Calculate BCH ecc code
23*4882a593Smuzhiyun */
24*4882a593Smuzhiyun int nand_bch_calculate_ecc(struct mtd_info *mtd, const u_char *dat,
25*4882a593Smuzhiyun u_char *ecc_code);
26*4882a593Smuzhiyun
27*4882a593Smuzhiyun /*
28*4882a593Smuzhiyun * Detect and correct bit errors
29*4882a593Smuzhiyun */
30*4882a593Smuzhiyun int nand_bch_correct_data(struct mtd_info *mtd, u_char *dat, u_char *read_ecc,
31*4882a593Smuzhiyun u_char *calc_ecc);
32*4882a593Smuzhiyun /*
33*4882a593Smuzhiyun * Initialize BCH encoder/decoder
34*4882a593Smuzhiyun */
35*4882a593Smuzhiyun struct nand_bch_control *nand_bch_init(struct mtd_info *mtd);
36*4882a593Smuzhiyun /*
37*4882a593Smuzhiyun * Release BCH encoder/decoder resources
38*4882a593Smuzhiyun */
39*4882a593Smuzhiyun void nand_bch_free(struct nand_bch_control *nbc);
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun #else /* !CONFIG_NAND_ECC_BCH */
42*4882a593Smuzhiyun
mtd_nand_has_bch(void)43*4882a593Smuzhiyun static inline int mtd_nand_has_bch(void) { return 0; }
44*4882a593Smuzhiyun
45*4882a593Smuzhiyun static inline int
nand_bch_calculate_ecc(struct mtd_info * mtd,const u_char * dat,u_char * ecc_code)46*4882a593Smuzhiyun nand_bch_calculate_ecc(struct mtd_info *mtd, const u_char *dat,
47*4882a593Smuzhiyun u_char *ecc_code)
48*4882a593Smuzhiyun {
49*4882a593Smuzhiyun return -1;
50*4882a593Smuzhiyun }
51*4882a593Smuzhiyun
52*4882a593Smuzhiyun static inline int
nand_bch_correct_data(struct mtd_info * mtd,unsigned char * buf,unsigned char * read_ecc,unsigned char * calc_ecc)53*4882a593Smuzhiyun nand_bch_correct_data(struct mtd_info *mtd, unsigned char *buf,
54*4882a593Smuzhiyun unsigned char *read_ecc, unsigned char *calc_ecc)
55*4882a593Smuzhiyun {
56*4882a593Smuzhiyun return -ENOTSUPP;
57*4882a593Smuzhiyun }
58*4882a593Smuzhiyun
nand_bch_init(struct mtd_info * mtd)59*4882a593Smuzhiyun static inline struct nand_bch_control *nand_bch_init(struct mtd_info *mtd)
60*4882a593Smuzhiyun {
61*4882a593Smuzhiyun return NULL;
62*4882a593Smuzhiyun }
63*4882a593Smuzhiyun
nand_bch_free(struct nand_bch_control * nbc)64*4882a593Smuzhiyun static inline void nand_bch_free(struct nand_bch_control *nbc) {}
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun #endif /* CONFIG_NAND_ECC_BCH */
67*4882a593Smuzhiyun
68*4882a593Smuzhiyun #endif /* __MTD_NAND_BCH_H__ */
69