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 *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_NAND_ECC_BCH */
42 
mtd_nand_has_bch(void)43 static inline int mtd_nand_has_bch(void) { return 0; }
44 
45 static inline int
nand_bch_calculate_ecc(struct mtd_info * mtd,const u_char * dat,u_char * ecc_code)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
nand_bch_correct_data(struct mtd_info * mtd,unsigned char * buf,unsigned char * read_ecc,unsigned char * calc_ecc)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 
nand_bch_init(struct mtd_info * mtd)59 static inline struct nand_bch_control *nand_bch_init(struct mtd_info *mtd)
60 {
61 	return NULL;
62 }
63 
nand_bch_free(struct nand_bch_control * nbc)64 static inline void nand_bch_free(struct nand_bch_control *nbc) {}
65 
66 #endif /* CONFIG_NAND_ECC_BCH */
67 
68 #endif /* __MTD_NAND_BCH_H__ */
69