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mtd: nand: complain loudly when chip->bits_per_cell is not correctly initialized
[karo-tx-linux.git] / 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 *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_MTD_NAND_ECC_BCH */
42
43 static inline int mtd_nand_has_bch(void) { return 0; }
44
45 static inline int
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
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
59 static inline struct nand_bch_control *nand_bch_init(struct mtd_info *mtd)
60 {
61         return NULL;
62 }
63
64 static inline void nand_bch_free(struct nand_bch_control *nbc) {}
65
66 #endif /* CONFIG_MTD_NAND_ECC_BCH */
67
68 #endif /* __MTD_NAND_BCH_H__ */