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
26struct erase_info_user {
27 __u32 start;
28 __u32 length;
29};
30
31struct erase_info_user64 {
32 __u64 start;
33 __u64 length;
34};
35
36struct mtd_oob_buf {
37 __u32 start;
38 __u32 length;
39 unsigned char *ptr;
40};
41
42struct 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 ioctl(MEMREAD); they are
59 * also used internally. See notes on "MTD file modes" for discussion on
60 * %MTD_OPS_RAW vs. %MTD_FILE_MODE_RAW.
61 */
62enum {
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 (only lower 32 bits are used)
73 * @ooblen: length of OOB buffer (only lower 32 bits are used)
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 */
84struct 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/**
95 * struct mtd_read_req_ecc_stats - ECC statistics for a read operation
96 *
97 * @uncorrectable_errors: the number of uncorrectable errors that happened
98 * during the read operation
99 * @corrected_bitflips: the number of bitflips corrected during the read
100 * operation
101 * @max_bitflips: the maximum number of bitflips detected in any single ECC
102 * step for the data read during the operation; this information
103 * can be used to decide whether the data stored in a specific
104 * region of the MTD device should be moved somewhere else to
105 * avoid data loss.
106 */
107struct mtd_read_req_ecc_stats {
108 __u32 uncorrectable_errors;
109 __u32 corrected_bitflips;
110 __u32 max_bitflips;
111};
112
113/**
114 * struct mtd_read_req - data structure for requesting a read operation
115 *
116 * @start: start address
117 * @len: length of data buffer (only lower 32 bits are used)
118 * @ooblen: length of OOB buffer (only lower 32 bits are used)
119 * @usr_data: user-provided data buffer
120 * @usr_oob: user-provided OOB buffer
121 * @mode: MTD mode (see "MTD operation modes")
122 * @padding: reserved, must be set to 0
123 * @ecc_stats: ECC statistics for the read operation
124 *
125 * This structure supports ioctl(MEMREAD) operations, allowing data and/or OOB
126 * reads in various modes. To read from OOB-only, set @usr_data == NULL, and to
127 * read data-only, set @usr_oob == NULL. However, setting both @usr_data and
128 * @usr_oob to NULL is not allowed.
129 */
130struct mtd_read_req {
131 __u64 start;
132 __u64 len;
133 __u64 ooblen;
134 __u64 usr_data;
135 __u64 usr_oob;
136 __u8 mode;
137 __u8 padding[7];
138 struct mtd_read_req_ecc_stats ecc_stats;
139};
140
141#define MTD_ABSENT 0
142#define MTD_RAM 1
143#define MTD_ROM 2
144#define MTD_NORFLASH 3
145#define MTD_NANDFLASH 4 /* SLC NAND */
146#define MTD_DATAFLASH 6
147#define MTD_UBIVOLUME 7
148#define MTD_MLCNANDFLASH 8 /* MLC NAND (including TLC) */
149
150#define MTD_WRITEABLE 0x400 /* Device is writeable */
151#define MTD_BIT_WRITEABLE 0x800 /* Single bits can be flipped */
152#define MTD_NO_ERASE 0x1000 /* No erase necessary */
153#define MTD_POWERUP_LOCK 0x2000 /* Always locked after reset */
154#define MTD_SLC_ON_MLC_EMULATION 0x4000 /* Emulate SLC behavior on MLC NANDs */
155
156/* Some common devices / combinations of capabilities */
157#define MTD_CAP_ROM 0
158#define MTD_CAP_RAM (MTD_WRITEABLE | MTD_BIT_WRITEABLE | MTD_NO_ERASE)
159#define MTD_CAP_NORFLASH (MTD_WRITEABLE | MTD_BIT_WRITEABLE)
160#define MTD_CAP_NANDFLASH (MTD_WRITEABLE)
161#define MTD_CAP_NVRAM (MTD_WRITEABLE | MTD_BIT_WRITEABLE | MTD_NO_ERASE)
162
163/* Obsolete ECC byte placement modes (used with obsolete MEMGETOOBSEL) */
164#define MTD_NANDECC_OFF 0 /* Switch off ECC (Not recommended) */
165#define MTD_NANDECC_PLACE 1 /* Use the given placement in the structure (YAFFS1 legacy mode) */
166#define MTD_NANDECC_AUTOPLACE 2 /* Use the default placement scheme */
167#define MTD_NANDECC_PLACEONLY 3 /* Use the given placement in the structure (Do not store ecc result on read) */
168#define MTD_NANDECC_AUTOPL_USR 4 /* Use the given autoplacement scheme rather than using the default */
169
170/* OTP mode selection */
171#define MTD_OTP_OFF 0
172#define MTD_OTP_FACTORY 1
173#define MTD_OTP_USER 2
174
175struct mtd_info_user {
176 __u8 type;
177 __u32 flags;
178 __u32 size; /* Total size of the MTD */
179 __u32 erasesize;
180 __u32 writesize;
181 __u32 oobsize; /* Amount of OOB data per block (e.g. 16) */
182 __u64 padding; /* Old obsolete field; do not use */
183};
184
185struct region_info_user {
186 __u32 offset; /* At which this region starts,
187 * from the beginning of the MTD */
188 __u32 erasesize; /* For this region */
189 __u32 numblocks; /* Number of blocks in this region */
190 __u32 regionindex;
191};
192
193struct otp_info {
194 __u32 start;
195 __u32 length;
196 __u32 locked;
197};
198
199/*
200 * Note, the following ioctl existed in the past and was removed:
201 * #define MEMSETOOBSEL _IOW('M', 9, struct nand_oobinfo)
202 * Try to avoid adding a new ioctl with the same ioctl number.
203 */
204
205/* Get basic MTD characteristics info (better to use sysfs) */
206#define MEMGETINFO _IOR('M', 1, struct mtd_info_user)
207/* Erase segment of MTD */
208#define MEMERASE _IOW('M', 2, struct erase_info_user)
209/* Write out-of-band data from MTD */
210#define MEMWRITEOOB _IOWR('M', 3, struct mtd_oob_buf)
211/* Read out-of-band data from MTD */
212#define MEMREADOOB _IOWR('M', 4, struct mtd_oob_buf)
213/* Lock a chip (for MTD that supports it) */
214#define MEMLOCK _IOW('M', 5, struct erase_info_user)
215/* Unlock a chip (for MTD that supports it) */
216#define MEMUNLOCK _IOW('M', 6, struct erase_info_user)
217/* Get the number of different erase regions */
218#define MEMGETREGIONCOUNT _IOR('M', 7, int)
219/* Get information about the erase region for a specific index */
220#define MEMGETREGIONINFO _IOWR('M', 8, struct region_info_user)
221/* Get info about OOB modes (e.g., RAW, PLACE, AUTO) - legacy interface */
222#define MEMGETOOBSEL _IOR('M', 10, struct nand_oobinfo)
223/* Check if an eraseblock is bad */
224#define MEMGETBADBLOCK _IOW('M', 11, __kernel_loff_t)
225/* Mark an eraseblock as bad */
226#define MEMSETBADBLOCK _IOW('M', 12, __kernel_loff_t)
227/* Set OTP (One-Time Programmable) mode (factory vs. user) */
228#define OTPSELECT _IOR('M', 13, int)
229/* Get number of OTP (One-Time Programmable) regions */
230#define OTPGETREGIONCOUNT _IOW('M', 14, int)
231/* Get all OTP (One-Time Programmable) info about MTD */
232#define OTPGETREGIONINFO _IOW('M', 15, struct otp_info)
233/* Lock a given range of user data (must be in mode %MTD_FILE_MODE_OTP_USER) */
234#define OTPLOCK _IOR('M', 16, struct otp_info)
235/* Get ECC layout (deprecated) */
236#define ECCGETLAYOUT _IOR('M', 17, struct nand_ecclayout_user)
237/* Get statistics about corrected/uncorrected errors */
238#define ECCGETSTATS _IOR('M', 18, struct mtd_ecc_stats)
239/* Set MTD mode on a per-file-descriptor basis (see "MTD file modes") */
240#define MTDFILEMODE _IO('M', 19)
241/* Erase segment of MTD (supports 64-bit address) */
242#define MEMERASE64 _IOW('M', 20, struct erase_info_user64)
243/* Write data to OOB (64-bit version) */
244#define MEMWRITEOOB64 _IOWR('M', 21, struct mtd_oob_buf64)
245/* Read data from OOB (64-bit version) */
246#define MEMREADOOB64 _IOWR('M', 22, struct mtd_oob_buf64)
247/* Check if chip is locked (for MTD that supports it) */
248#define MEMISLOCKED _IOR('M', 23, struct erase_info_user)
249/*
250 * Most generic write interface; can write in-band and/or out-of-band in various
251 * modes (see "struct mtd_write_req"). This ioctl is not supported for flashes
252 * without OOB, e.g., NOR flash.
253 */
254#define MEMWRITE _IOWR('M', 24, struct mtd_write_req)
255/* Erase a given range of user data (must be in mode %MTD_FILE_MODE_OTP_USER) */
256#define OTPERASE _IOW('M', 25, struct otp_info)
257/*
258 * Most generic read interface; can read in-band and/or out-of-band in various
259 * modes (see "struct mtd_read_req"). This ioctl is not supported for flashes
260 * without OOB, e.g., NOR flash.
261 */
262#define MEMREAD _IOWR('M', 26, struct mtd_read_req)
263
264/*
265 * Obsolete legacy interface. Keep it in order not to break userspace
266 * interfaces
267 */
268struct nand_oobinfo {
269 __u32 useecc;
270 __u32 eccbytes;
271 __u32 oobfree[8][2];
272 __u32 eccpos[32];
273};
274
275struct nand_oobfree {
276 __u32 offset;
277 __u32 length;
278};
279
280#define MTD_MAX_OOBFREE_ENTRIES 8
281#define MTD_MAX_ECCPOS_ENTRIES 64
282/*
283 * OBSOLETE: ECC layout control structure. Exported to user-space via ioctl
284 * ECCGETLAYOUT for backwards compatbility and should not be mistaken as a
285 * complete set of ECC information. The ioctl truncates the larger internal
286 * structure to retain binary compatibility with the static declaration of the
287 * ioctl. Note that the "MTD_MAX_..._ENTRIES" macros represent the max size of
288 * the user struct, not the MAX size of the internal OOB layout representation.
289 */
290struct nand_ecclayout_user {
291 __u32 eccbytes;
292 __u32 eccpos[MTD_MAX_ECCPOS_ENTRIES];
293 __u32 oobavail;
294 struct nand_oobfree oobfree[MTD_MAX_OOBFREE_ENTRIES];
295};
296
297/**
298 * struct mtd_ecc_stats - error correction stats
299 *
300 * @corrected: number of corrected bits
301 * @failed: number of uncorrectable errors
302 * @badblocks: number of bad blocks in this partition
303 * @bbtblocks: number of blocks reserved for bad block tables
304 */
305struct mtd_ecc_stats {
306 __u32 corrected;
307 __u32 failed;
308 __u32 badblocks;
309 __u32 bbtblocks;
310};
311
312/*
313 * MTD file modes - for read/write access to MTD
314 *
315 * @MTD_FILE_MODE_NORMAL: OTP disabled, ECC enabled
316 * @MTD_FILE_MODE_OTP_FACTORY: OTP enabled in factory mode
317 * @MTD_FILE_MODE_OTP_USER: OTP enabled in user mode
318 * @MTD_FILE_MODE_RAW: OTP disabled, ECC disabled
319 *
320 * These modes can be set via ioctl(MTDFILEMODE). The mode will be retained
321 * separately for each open file descriptor.
322 *
323 * Note: %MTD_FILE_MODE_RAW provides the same functionality as %MTD_OPS_RAW -
324 * raw access to the flash, without error correction or autoplacement schemes.
325 * Wherever possible, the MTD_OPS_* mode will override the MTD_FILE_MODE_* mode
326 * (e.g., when using ioctl(MEMWRITE) or ioctl(MEMREAD)), but in some cases, the
327 * MTD_FILE_MODE is used out of necessity (e.g., `write()',
328 * ioctl(MEMWRITEOOB64)).
329 */
330enum mtd_file_modes {
331 MTD_FILE_MODE_NORMAL = MTD_OTP_OFF,
332 MTD_FILE_MODE_OTP_FACTORY = MTD_OTP_FACTORY,
333 MTD_FILE_MODE_OTP_USER = MTD_OTP_USER,
334 MTD_FILE_MODE_RAW,
335};
336
337static __inline__ int mtd_type_is_nand_user(const struct mtd_info_user *mtd)
338{
339 return mtd->type == MTD_NANDFLASH || mtd->type == MTD_MLCNANDFLASH;
340}
341
342#endif /* __MTD_ABI_H__ */