1 /*
2 * Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org> et al.
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 as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 *
18 */
19
20 #ifndef __MTD_ABI_H__
21 #define __MTD_ABI_H__
22
23 #include <linux/types.h>
24
25 struct erase_info_user {
26 __u32 start;
27 __u32 length;
28 };
29
30 struct erase_info_user64 {
31 __u64 start;
32 __u64 length;
33 };
34
35 struct mtd_oob_buf {
36 __u32 start;
37 __u32 length;
38 unsigned char __user *ptr;
39 };
40
41 struct mtd_oob_buf64 {
42 __u64 start;
43 __u32 pad;
44 __u32 length;
45 __u64 usr_ptr;
46 };
47
48 /**
49 * MTD operation modes
50 *
51 * @MTD_OPS_PLACE_OOB: OOB data are placed at the given offset (default)
52 * @MTD_OPS_AUTO_OOB: OOB data are automatically placed at the free areas
53 * which are defined by the internal ecclayout
54 * @MTD_OPS_RAW: data are transferred as-is, with no error correction;
55 * this mode implies %MTD_OPS_PLACE_OOB
56 *
57 * These modes can be passed to ioctl(MEMWRITE) and are also used internally.
58 * See notes on "MTD file modes" for discussion on %MTD_OPS_RAW vs.
59 * %MTD_FILE_MODE_RAW.
60 */
61 enum {
62 MTD_OPS_PLACE_OOB = 0,
63 MTD_OPS_AUTO_OOB = 1,
64 MTD_OPS_RAW = 2,
65 };
66
67 /**
68 * struct mtd_write_req - data structure for requesting a write operation
69 *
70 * @start: start address
71 * @len: length of data buffer
72 * @ooblen: length of OOB buffer
73 * @usr_data: user-provided data buffer
74 * @usr_oob: user-provided OOB buffer
75 * @mode: MTD mode (see "MTD operation modes")
76 * @padding: reserved, must be set to 0
77 *
78 * This structure supports ioctl(MEMWRITE) operations, allowing data and/or OOB
79 * writes in various modes. To write to OOB-only, set @usr_data == NULL, and to
80 * write data-only, set @usr_oob == NULL. However, setting both @usr_data and
81 * @usr_oob to NULL is not allowed.
82 */
83 struct mtd_write_req {
84 __u64 start;
85 __u64 len;
86 __u64 ooblen;
87 __u64 usr_data;
88 __u64 usr_oob;
89 __u8 mode;
90 __u8 padding[7];
91 };
92
93 #define MTD_ABSENT 0
94 #define MTD_RAM 1
95 #define MTD_ROM 2
96 #define MTD_NORFLASH 3
97 #define MTD_NANDFLASH 4 /* SLC NAND */
98 #define MTD_DATAFLASH 6
99 #define MTD_UBIVOLUME 7
100 #define MTD_MLCNANDFLASH 8 /* MLC NAND (including TLC) */
101
102 #define MTD_WRITEABLE 0x400 /* Device is writeable */
103 #define MTD_BIT_WRITEABLE 0x800 /* Single bits can be flipped */
104 #define MTD_NO_ERASE 0x1000 /* No erase necessary */
105 #define MTD_POWERUP_LOCK 0x2000 /* Always locked after reset */
106
107 /* Some common devices / combinations of capabilities */
108 #define MTD_CAP_ROM 0
109 #define MTD_CAP_RAM (MTD_WRITEABLE | MTD_BIT_WRITEABLE | MTD_NO_ERASE)
110 #define MTD_CAP_NORFLASH (MTD_WRITEABLE | MTD_BIT_WRITEABLE)
111 #define MTD_CAP_NANDFLASH (MTD_WRITEABLE)
112 #define MTD_CAP_NVRAM (MTD_WRITEABLE | MTD_BIT_WRITEABLE | MTD_NO_ERASE)
113
114 /* Obsolete ECC byte placement modes (used with obsolete MEMGETOOBSEL) */
115 #define MTD_NANDECC_OFF 0 // Switch off ECC (Not recommended)
116 #define MTD_NANDECC_PLACE 1 // Use the given placement in the structure (YAFFS1 legacy mode)
117 #define MTD_NANDECC_AUTOPLACE 2 // Use the default placement scheme
118 #define MTD_NANDECC_PLACEONLY 3 // Use the given placement in the structure (Do not store ecc result on read)
119 #define MTD_NANDECC_AUTOPL_USR 4 // Use the given autoplacement scheme rather than using the default
120
121 /* OTP mode selection */
122 #define MTD_OTP_OFF 0
123 #define MTD_OTP_FACTORY 1
124 #define MTD_OTP_USER 2
125
126 struct mtd_info_user {
127 __u8 type;
128 __u32 flags;
129 __u32 size; /* Total size of the MTD */
130 __u32 erasesize;
131 __u32 writesize;
132 __u32 oobsize; /* Amount of OOB data per block (e.g. 16) */
133 __u64 padding; /* Old obsolete field; do not use */
134 };
135
136 struct region_info_user {
137 __u32 offset; /* At which this region starts,
138 * from the beginning of the MTD */
139 __u32 erasesize; /* For this region */
140 __u32 numblocks; /* Number of blocks in this region */
141 __u32 regionindex;
142 };
143
144 struct otp_info {
145 __u32 start;
146 __u32 length;
147 __u32 locked;
148 };
149
150 /*
151 * Note, the following ioctl existed in the past and was removed:
152 * #define MEMSETOOBSEL _IOW('M', 9, struct nand_oobinfo)
153 * Try to avoid adding a new ioctl with the same ioctl number.
154 */
155
156 /* Get basic MTD characteristics info (better to use sysfs) */
157 #define MEMGETINFO _IOR('M', 1, struct mtd_info_user)
158 /* Erase segment of MTD */
159 #define MEMERASE _IOW('M', 2, struct erase_info_user)
160 /* Write out-of-band data from MTD */
161 #define MEMWRITEOOB _IOWR('M', 3, struct mtd_oob_buf)
162 /* Read out-of-band data from MTD */
163 #define MEMREADOOB _IOWR('M', 4, struct mtd_oob_buf)
164 /* Lock a chip (for MTD that supports it) */
165 #define MEMLOCK _IOW('M', 5, struct erase_info_user)
166 /* Unlock a chip (for MTD that supports it) */
167 #define MEMUNLOCK _IOW('M', 6, struct erase_info_user)
168 /* Get the number of different erase regions */
169 #define MEMGETREGIONCOUNT _IOR('M', 7, int)
170 /* Get information about the erase region for a specific index */
171 #define MEMGETREGIONINFO _IOWR('M', 8, struct region_info_user)
172 /* Get info about OOB modes (e.g., RAW, PLACE, AUTO) - legacy interface */
173 #define MEMGETOOBSEL _IOR('M', 10, struct nand_oobinfo)
174 /* Check if an eraseblock is bad */
175 #define MEMGETBADBLOCK _IOW('M', 11, __kernel_loff_t)
176 /* Mark an eraseblock as bad */
177 #define MEMSETBADBLOCK _IOW('M', 12, __kernel_loff_t)
178 /* Set OTP (One-Time Programmable) mode (factory vs. user) */
179 #define OTPSELECT _IOR('M', 13, int)
180 /* Get number of OTP (One-Time Programmable) regions */
181 #define OTPGETREGIONCOUNT _IOW('M', 14, int)
182 /* Get all OTP (One-Time Programmable) info about MTD */
183 #define OTPGETREGIONINFO _IOW('M', 15, struct otp_info)
184 /* Lock a given range of user data (must be in mode %MTD_FILE_MODE_OTP_USER) */
185 #define OTPLOCK _IOR('M', 16, struct otp_info)
186 /* Get ECC layout (deprecated) */
187 #define ECCGETLAYOUT _IOR('M', 17, struct nand_ecclayout_user)
188 /* Get statistics about corrected/uncorrected errors */
189 #define ECCGETSTATS _IOR('M', 18, struct mtd_ecc_stats)
190 /* Set MTD mode on a per-file-descriptor basis (see "MTD file modes") */
191 #define MTDFILEMODE _IO('M', 19)
192 /* Erase segment of MTD (supports 64-bit address) */
193 #define MEMERASE64 _IOW('M', 20, struct erase_info_user64)
194 /* Write data to OOB (64-bit version) */
195 #define MEMWRITEOOB64 _IOWR('M', 21, struct mtd_oob_buf64)
196 /* Read data from OOB (64-bit version) */
197 #define MEMREADOOB64 _IOWR('M', 22, struct mtd_oob_buf64)
198 /* Check if chip is locked (for MTD that supports it) */
199 #define MEMISLOCKED _IOR('M', 23, struct erase_info_user)
200 /*
201 * Most generic write interface; can write in-band and/or out-of-band in various
202 * modes (see "struct mtd_write_req"). This ioctl is not supported for flashes
203 * without OOB, e.g., NOR flash.
204 */
205 #define MEMWRITE _IOWR('M', 24, struct mtd_write_req)
206
207 /*
208 * Obsolete legacy interface. Keep it in order not to break userspace
209 * interfaces
210 */
211 struct nand_oobinfo {
212 __u32 useecc;
213 __u32 eccbytes;
214 __u32 oobfree[8][2];
215 __u32 eccpos[32];
216 };
217
218 struct nand_oobfree {
219 __u32 offset;
220 __u32 length;
221 };
222
223 #define MTD_MAX_OOBFREE_ENTRIES 8
224 #define MTD_MAX_ECCPOS_ENTRIES 64
225 /*
226 * OBSOLETE: ECC layout control structure. Exported to user-space via ioctl
227 * ECCGETLAYOUT for backwards compatbility and should not be mistaken as a
228 * complete set of ECC information. The ioctl truncates the larger internal
229 * structure to retain binary compatibility with the static declaration of the
230 * ioctl. Note that the "MTD_MAX_..._ENTRIES" macros represent the max size of
231 * the user struct, not the MAX size of the internal OOB layout representation.
232 */
233 struct nand_ecclayout_user {
234 __u32 eccbytes;
235 __u32 eccpos[MTD_MAX_ECCPOS_ENTRIES];
236 __u32 oobavail;
237 struct nand_oobfree oobfree[MTD_MAX_OOBFREE_ENTRIES];
238 };
239
240 /**
241 * struct mtd_ecc_stats - error correction stats
242 *
243 * @corrected: number of corrected bits
244 * @failed: number of uncorrectable errors
245 * @badblocks: number of bad blocks in this partition
246 * @bbtblocks: number of blocks reserved for bad block tables
247 */
248 struct mtd_ecc_stats {
249 __u32 corrected;
250 __u32 failed;
251 __u32 badblocks;
252 __u32 bbtblocks;
253 };
254
255 /*
256 * MTD file modes - for read/write access to MTD
257 *
258 * @MTD_FILE_MODE_NORMAL: OTP disabled, ECC enabled
259 * @MTD_FILE_MODE_OTP_FACTORY: OTP enabled in factory mode
260 * @MTD_FILE_MODE_OTP_USER: OTP enabled in user mode
261 * @MTD_FILE_MODE_RAW: OTP disabled, ECC disabled
262 *
263 * These modes can be set via ioctl(MTDFILEMODE). The mode mode will be retained
264 * separately for each open file descriptor.
265 *
266 * Note: %MTD_FILE_MODE_RAW provides the same functionality as %MTD_OPS_RAW -
267 * raw access to the flash, without error correction or autoplacement schemes.
268 * Wherever possible, the MTD_OPS_* mode will override the MTD_FILE_MODE_* mode
269 * (e.g., when using ioctl(MEMWRITE)), but in some cases, the MTD_FILE_MODE is
270 * used out of necessity (e.g., `write()', ioctl(MEMWRITEOOB64)).
271 */
272 enum mtd_file_modes {
273 MTD_FILE_MODE_NORMAL = MTD_OTP_OFF,
274 MTD_FILE_MODE_OTP_FACTORY = MTD_OTP_FACTORY,
275 MTD_FILE_MODE_OTP_USER = MTD_OTP_USER,
276 MTD_FILE_MODE_RAW,
277 };
278
mtd_type_is_nand_user(const struct mtd_info_user * mtd)279 static inline int mtd_type_is_nand_user(const struct mtd_info_user *mtd)
280 {
281 return mtd->type == MTD_NANDFLASH || mtd->type == MTD_MLCNANDFLASH;
282 }
283
284 #endif /* __MTD_ABI_H__ */
285