aboutsummaryrefslogtreecommitdiffstats
path: root/include/mtd/mtd-abi.h
blob: 4debb451463474a30da023f25161b4077e58f6c0 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
/*
 * Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org> et al.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

#ifndef __MTD_ABI_H__
#define __MTD_ABI_H__

#include <linux/types.h>

struct erase_info_user {
	__u32 start;
	__u32 length;
};

struct erase_info_user64 {
	__u64 start;
	__u64 length;
};

struct mtd_oob_buf {
	__u32 start;
	__u32 length;
	unsigned char __user *ptr;
};

struct mtd_oob_buf64 {
	__u64 start;
	__u32 pad;
	__u32 length;
	__u64 usr_ptr;
};

#define MTD_ABSENT		0
#define MTD_RAM			1
#define MTD_ROM			2
#define MTD_NORFLASH		3
#define MTD_NANDFLASH		4
#define MTD_DATAFLASH		6
#define MTD_UBIVOLUME		7

#define MTD_WRITEABLE		0x400	/* Device is writeable */
#define MTD_BIT_WRITEABLE	0x800	/* Single bits can be flipped */
#define MTD_NO_ERASE		0x1000	/* No erase necessary */
#define MTD_POWERUP_LOCK	0x2000	/* Always locked after reset */

// Some common devices / combinations of capabilities
#define MTD_CAP_ROM		0
#define MTD_CAP_RAM		(MTD_WRITEABLE | MTD_BIT_WRITEABLE | MTD_NO_ERASE)
#define MTD_CAP_NORFLASH	(MTD_WRITEABLE | MTD_BIT_WRITEABLE)
#define MTD_CAP_NANDFLASH	(MTD_WRITEABLE)

/* ECC byte placement */
#define MTD_NANDECC_OFF		0	// Switch off ECC (Not recommended)
#define MTD_NANDECC_PLACE	1	// Use the given placement in the structure (YAFFS1 legacy mode)
#define MTD_NANDECC_AUTOPLACE	2	// Use the default placement scheme
#define MTD_NANDECC_PLACEONLY	3	// Use the given placement in the structure (Do not store ecc result on read)
#define MTD_NANDECC_AUTOPL_USR 	4	// Use the given autoplacement scheme rather than using the default

/* OTP mode selection */
#define MTD_OTP_OFF		0
#define MTD_OTP_FACTORY		1
#define MTD_OTP_USER		2

struct mtd_info_user {
	__u8 type;
	__u32 flags;
	__u32 size;	 // Total size of the MTD
	__u32 erasesize;
	__u32 writesize;
	__u32 oobsize;   // Amount of OOB data per block (e.g. 16)
	/* The below two fields are obsolete and broken, do not use them
	 * (TODO: remove at some point) */
	__u32 ecctype;
	__u32 eccsize;
};

struct region_info_user {
	__u32 offset;		/* At which this region starts,
					 * from the beginning of the MTD */
	__u32 erasesize;		/* For this region */
	__u32 numblocks;		/* Number of blocks in this region */
	__u32 regionindex;
};

struct otp_info {
	__u32 start;
	__u32 length;
	__u32 locked;
};

#define MEMGETINFO		_IOR('M', 1, struct mtd_info_user)
#define MEMERASE		_IOW('M', 2, struct erase_info_user)
#define MEMWRITEOOB		_IOWR('M', 3, struct mtd_oob_buf)
#define MEMREADOOB		_IOWR('M', 4, struct mtd_oob_buf)
#define MEMLOCK			_IOW('M', 5, struct erase_info_user)
#define MEMUNLOCK		_IOW('M', 6, struct erase_info_user)
#define MEMGETREGIONCOUNT	_IOR('M', 7, int)
#define MEMGETREGIONINFO	_IOWR('M', 8, struct region_info_user)
#define MEMSETOOBSEL		_IOW('M', 9, struct nand_oobinfo)
#define MEMGETOOBSEL		_IOR('M', 10, struct nand_oobinfo)
#define MEMGETBADBLOCK		_IOW('M', 11, __kernel_loff_t)
#define MEMSETBADBLOCK		_IOW('M', 12, __kernel_loff_t)
#define OTPSELECT		_IOR('M', 13, int)
#define OTPGETREGIONCOUNT	_IOW('M', 14, int)
#define OTPGETREGIONINFO	_IOW('M', 15, struct otp_info)
#define OTPLOCK			_IOR('M', 16, struct otp_info)
#define ECCGETLAYOUT		_IOR('M', 17, struct nand_ecclayout)
#define ECCGETSTATS		_IOR('M', 18, struct mtd_ecc_stats)
#define MTDFILEMODE		_IO('M', 19)
#define MEMERASE64		_IOW('M', 20, struct erase_info_user64)
#define MEMWRITEOOB64		_IOWR('M', 21, struct mtd_oob_buf64)
#define MEMREADOOB64		_IOWR('M', 22, struct mtd_oob_buf64)
#define MEMISLOCKED		_IOR('M', 23, struct erase_info_user)

/*
 * Obsolete legacy interface. Keep it in order not to break userspace
 * interfaces
 */
struct nand_oobinfo {
	__u32 useecc;
	__u32 eccbytes;
	__u32 oobfree[8][2];
	__u32 eccpos[32];
};

struct nand_oobfree {
	__u32 offset;
	__u32 length;
};

#define MTD_MAX_OOBFREE_ENTRIES	8
/*
 * ECC layout control structure. Exported to userspace for
 * diagnosis and to allow creation of raw images
 */
struct nand_ecclayout {
	__u32 eccbytes;
	__u32 eccpos[64];
	__u32 oobavail;
	struct nand_oobfree oobfree[MTD_MAX_OOBFREE_ENTRIES];
};

/**
 * struct mtd_ecc_stats - error correction stats
 *
 * @corrected:	number of corrected bits
 * @failed:	number of uncorrectable errors
 * @badblocks:	number of bad blocks in this partition
 * @bbtblocks:	number of blocks reserved for bad block tables
 */
struct mtd_ecc_stats {
	__u32 corrected;
	__u32 failed;
	__u32 badblocks;
	__u32 bbtblocks;
};

/*
 * Read/write file modes for access to MTD
 */
enum mtd_file_modes {
	MTD_MODE_NORMAL = MTD_OTP_OFF,
	MTD_MODE_OTP_FACTORY = MTD_OTP_FACTORY,
	MTD_MODE_OTP_USER = MTD_OTP_USER,
	MTD_MODE_RAW,
};

#endif /* __MTD_ABI_H__ */