1 /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
2 /*
3 * Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org> et al.
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 *
19 */
20
21 #ifndef __MTD_ABI_H__
22 #define __MTD_ABI_H__
23
24 #include <linux/types.h>
25
26 struct erase_info_user {
27 __u32 start;
28 __u32 length;
29 };
30
31 struct erase_info_user64 {
32 __u64 start;
33 __u64 length;
34 };
35
36 struct mtd_oob_buf {
37 __u32 start;
38 __u32 length;
39 unsigned char __user *ptr;
40 };
41
42 struct mtd_oob_buf64 {
43 __u64 start;
44 __u32 pad;
45 __u32 length;
46 __u64 usr_ptr;
47 };
48
49 /**
50 * MTD operation modes
51 *
52 * @MTD_OPS_PLACE_OOB: OOB data are placed at the given offset (default)
53 * @MTD_OPS_AUTO_OOB: OOB data are automatically placed at the free areas
54 * which are defined by the internal ecclayout
55 * @MTD_OPS_RAW: data are transferred as-is, with no error correction;
56 * this mode implies %MTD_OPS_PLACE_OOB
57 *
58 * These modes can be passed to ioctl(MEMWRITE) and are also used internally.
59 * See notes on "MTD file modes" for discussion on %MTD_OPS_RAW vs.
60 * %MTD_FILE_MODE_RAW.
61 */
62 enum {
63 MTD_OPS_PLACE_OOB = 0,
64 MTD_OPS_AUTO_OOB = 1,
65 MTD_OPS_RAW = 2,
66 };
67
68 /**
69 * struct mtd_write_req - data structure for requesting a write operation
70 *
71 * @start: start address
72 * @len: length of data buffer
73 * @ooblen: length of OOB buffer
74 * @usr_data: user-provided data buffer
75 * @usr_oob: user-provided OOB buffer
76 * @mode: MTD mode (see "MTD operation modes")
77 * @padding: reserved, must be set to 0
78 *
79 * This structure supports ioctl(MEMWRITE) operations, allowing data and/or OOB
80 * writes in various modes. To write to OOB-only, set @usr_data == NULL, and to
81 * write data-only, set @usr_oob == NULL. However, setting both @usr_data and
82 * @usr_oob to NULL is not allowed.
83 */
84 struct mtd_write_req {
85 __u64 start;
86 __u64 len;
87 __u64 ooblen;
88 __u64 usr_data;
89 __u64 usr_oob;
90 __u8 mode;
91 __u8 padding[7];
92 };
93
94 #define MTD_ABSENT 0
95 #define MTD_RAM 1
96 #define MTD_ROM 2
97 #define MTD_NORFLASH 3
98 #define MTD_NANDFLASH 4 /* SLC NAND */
99 #define MTD_DATAFLASH 6
100 #define MTD_UBIVOLUME 7
101 #define MTD_MLCNANDFLASH 8 /* MLC NAND (including TLC) */
102
103 #define MTD_WRITEABLE 0x400 /* Device is writeable */
104 #define MTD_BIT_WRITEABLE 0x800 /* Single bits can be flipped */
105 #define MTD_NO_ERASE 0x1000 /* No erase necessary */
106 #define MTD_POWERUP_LOCK 0x2000 /* Always locked after reset */
107
108 /* Some common devices / combinations of capabilities */
109 #define MTD_CAP_ROM 0
110 #define MTD_CAP_RAM (MTD_WRITEABLE | MTD_BIT_WRITEABLE | MTD_NO_ERASE)
111 #define MTD_CAP_NORFLASH (MTD_WRITEABLE | MTD_BIT_WRITEABLE)
112 #define MTD_CAP_NANDFLASH (MTD_WRITEABLE)
113 #define MTD_CAP_NVRAM (MTD_WRITEABLE | MTD_BIT_WRITEABLE | MTD_NO_ERASE)
114
115 /* Obsolete ECC byte placement modes (used with obsolete MEMGETOOBSEL) */
116 #define MTD_NANDECC_OFF 0 /* Switch off ECC (Not recommended) */
117 #define MTD_NANDECC_PLACE 1 /* Use the given placement in the structure (YAFFS1 legacy mode) */
118 #define MTD_NANDECC_AUTOPLACE 2 /* Use the default placement scheme */
119 #define MTD_NANDECC_PLACEONLY 3 /* Use the given placement in the structure (Do not store ecc result on read) */
120 #define MTD_NANDECC_AUTOPL_USR 4 /* Use the given autoplacement scheme rather than using the default */
121
122 /* OTP mode selection */
123 #define MTD_OTP_OFF 0
124 #define MTD_OTP_FACTORY 1
125 #define MTD_OTP_USER 2
126
127 struct mtd_info_user {
128 __u8 type;
129 __u32 flags;
130 __u32 size; /* Total size of the MTD */
131 __u32 erasesize;
132 __u32 writesize;
133 __u32 oobsize; /* Amount of OOB data per block (e.g. 16) */
134 __u64 padding; /* Old obsolete field; do not use */
135 };
136
137 struct region_info_user {
138 __u32 offset; /* At which this region starts,
139 * from the beginning of the MTD */
140 __u32 erasesize; /* For this region */
141 __u32 numblocks; /* Number of blocks in this region */
142 __u32 regionindex;
143 };
144
145 struct otp_info {
146 __u32 start;
147 __u32 length;
148 __u32 locked;
149 };
150
151 /*
152 * Note, the following ioctl existed in the past and was removed:
153 * #define MEMSETOOBSEL _IOW('M', 9, struct nand_oobinfo)
154 * Try to avoid adding a new ioctl with the same ioctl number.
155 */
156
157 /* Get basic MTD characteristics info (better to use sysfs) */
158 #define MEMGETINFO _IOR('M', 1, struct mtd_info_user)
159 /* Erase segment of MTD */
160 #define MEMERASE _IOW('M', 2, struct erase_info_user)
161 /* Write out-of-band data from MTD */
162 #define MEMWRITEOOB _IOWR('M', 3, struct mtd_oob_buf)
163 /* Read out-of-band data from MTD */
164 #define MEMREADOOB _IOWR('M', 4, struct mtd_oob_buf)
165 /* Lock a chip (for MTD that supports it) */
166 #define MEMLOCK _IOW('M', 5, struct erase_info_user)
167 /* Unlock a chip (for MTD that supports it) */
168 #define MEMUNLOCK _IOW('M', 6, struct erase_info_user)
169 /* Get the number of different erase regions */
170 #define MEMGETREGIONCOUNT _IOR('M', 7, int)
171 /* Get information about the erase region for a specific index */
172 #define MEMGETREGIONINFO _IOWR('M', 8, struct region_info_user)
173 /* Get info about OOB modes (e.g., RAW, PLACE, AUTO) - legacy interface */
174 #define MEMGETOOBSEL _IOR('M', 10, struct nand_oobinfo)
175 /* Check if an eraseblock is bad */
176 #define MEMGETBADBLOCK _IOW('M', 11, __kernel_loff_t)
177 /* Mark an eraseblock as bad */
178 #define MEMSETBADBLOCK _IOW('M', 12, __kernel_loff_t)
179 /* Set OTP (One-Time Programmable) mode (factory vs. user) */
180 #define OTPSELECT _IOR('M', 13, int)
181 /* Get number of OTP (One-Time Programmable) regions */
182 #define OTPGETREGIONCOUNT _IOW('M', 14, int)
183 /* Get all OTP (One-Time Programmable) info about MTD */
184 #define OTPGETREGIONINFO _IOW('M', 15, struct otp_info)
185 /* Lock a given range of user data (must be in mode %MTD_FILE_MODE_OTP_USER) */
186 #define OTPLOCK _IOR('M', 16, struct otp_info)
187 /* Get ECC layout (deprecated) */
188 #define ECCGETLAYOUT _IOR('M', 17, struct nand_ecclayout_user)
189 /* Get statistics about corrected/uncorrected errors */
190 #define ECCGETSTATS _IOR('M', 18, struct mtd_ecc_stats)
191 /* Set MTD mode on a per-file-descriptor basis (see "MTD file modes") */
192 #define MTDFILEMODE _IO('M', 19)
193 /* Erase segment of MTD (supports 64-bit address) */
194 #define MEMERASE64 _IOW('M', 20, struct erase_info_user64)
195 /* Write data to OOB (64-bit version) */
196 #define MEMWRITEOOB64 _IOWR('M', 21, struct mtd_oob_buf64)
197 /* Read data from OOB (64-bit version) */
198 #define MEMREADOOB64 _IOWR('M', 22, struct mtd_oob_buf64)
199 /* Check if chip is locked (for MTD that supports it) */
200 #define MEMISLOCKED _IOR('M', 23, struct erase_info_user)
201 /*
202 * Most generic write interface; can write in-band and/or out-of-band in various
203 * modes (see "struct mtd_write_req"). This ioctl is not supported for flashes
204 * without OOB, e.g., NOR flash.
205 */
206 #define MEMWRITE _IOWR('M', 24, struct mtd_write_req)
207
208 /*
209 * Obsolete legacy interface. Keep it in order not to break userspace
210 * interfaces
211 */
212 struct nand_oobinfo {
213 __u32 useecc;
214 __u32 eccbytes;
215 __u32 oobfree[8][2];
216 __u32 eccpos[32];
217 };
218
219 struct nand_oobfree {
220 __u32 offset;
221 __u32 length;
222 };
223
224 #define MTD_MAX_OOBFREE_ENTRIES 8
225 #define MTD_MAX_ECCPOS_ENTRIES 64
226 /*
227 * OBSOLETE: ECC layout control structure. Exported to user-space via ioctl
228 * ECCGETLAYOUT for backwards compatbility and should not be mistaken as a
229 * complete set of ECC information. The ioctl truncates the larger internal
230 * structure to retain binary compatibility with the static declaration of the
231 * ioctl. Note that the "MTD_MAX_..._ENTRIES" macros represent the max size of
232 * the user struct, not the MAX size of the internal OOB layout representation.
233 */
234 struct nand_ecclayout_user {
235 __u32 eccbytes;
236 __u32 eccpos[MTD_MAX_ECCPOS_ENTRIES];
237 __u32 oobavail;
238 struct nand_oobfree oobfree[MTD_MAX_OOBFREE_ENTRIES];
239 };
240
241 /**
242 * struct mtd_ecc_stats - error correction stats
243 *
244 * @corrected: number of corrected bits
245 * @failed: number of uncorrectable errors
246 * @badblocks: number of bad blocks in this partition
247 * @bbtblocks: number of blocks reserved for bad block tables
248 */
249 struct mtd_ecc_stats {
250 __u32 corrected;
251 __u32 failed;
252 __u32 badblocks;
253 __u32 bbtblocks;
254 };
255
256 /*
257 * MTD file modes - for read/write access to MTD
258 *
259 * @MTD_FILE_MODE_NORMAL: OTP disabled, ECC enabled
260 * @MTD_FILE_MODE_OTP_FACTORY: OTP enabled in factory mode
261 * @MTD_FILE_MODE_OTP_USER: OTP enabled in user mode
262 * @MTD_FILE_MODE_RAW: OTP disabled, ECC disabled
263 *
264 * These modes can be set via ioctl(MTDFILEMODE). The mode mode will be retained
265 * separately for each open file descriptor.
266 *
267 * Note: %MTD_FILE_MODE_RAW provides the same functionality as %MTD_OPS_RAW -
268 * raw access to the flash, without error correction or autoplacement schemes.
269 * Wherever possible, the MTD_OPS_* mode will override the MTD_FILE_MODE_* mode
270 * (e.g., when using ioctl(MEMWRITE)), but in some cases, the MTD_FILE_MODE is
271 * used out of necessity (e.g., `write()', ioctl(MEMWRITEOOB64)).
272 */
273 enum mtd_file_modes {
274 MTD_FILE_MODE_NORMAL = MTD_OTP_OFF,
275 MTD_FILE_MODE_OTP_FACTORY = MTD_OTP_FACTORY,
276 MTD_FILE_MODE_OTP_USER = MTD_OTP_USER,
277 MTD_FILE_MODE_RAW,
278 };
279
mtd_type_is_nand_user(const struct mtd_info_user * mtd)280 static inline int mtd_type_is_nand_user(const struct mtd_info_user *mtd)
281 {
282 return mtd->type == MTD_NANDFLASH || mtd->type == MTD_MLCNANDFLASH;
283 }
284
285 #endif /* __MTD_ABI_H__ */
286
