2 * Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org> et al.
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.
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.
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
23 #include <linux/types.h>
25 struct erase_info_user {
30 struct erase_info_user64 {
38 unsigned char __user *ptr;
41 struct mtd_oob_buf64 {
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
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.
62 MTD_OPS_PLACE_OOB = 0,
68 * struct mtd_write_req - data structure for requesting a write operation
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
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.
83 struct mtd_write_req {
96 #define MTD_NORFLASH 3
97 #define MTD_NANDFLASH 4
98 #define MTD_DATAFLASH 6
99 #define MTD_UBIVOLUME 7
100 #define MTD_MLCNANDFLASH 8
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 */
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)
113 /* Obsolete ECC byte placement modes (used with obsolete MEMGETOOBSEL) */
114 #define MTD_NANDECC_OFF 0 // Switch off ECC (Not recommended)
115 #define MTD_NANDECC_PLACE 1 // Use the given placement in the structure (YAFFS1 legacy mode)
116 #define MTD_NANDECC_AUTOPLACE 2 // Use the default placement scheme
117 #define MTD_NANDECC_PLACEONLY 3 // Use the given placement in the structure (Do not store ecc result on read)
118 #define MTD_NANDECC_AUTOPL_USR 4 // Use the given autoplacement scheme rather than using the default
120 /* OTP mode selection */
121 #define MTD_OTP_OFF 0
122 #define MTD_OTP_FACTORY 1
123 #define MTD_OTP_USER 2
125 struct mtd_info_user {
128 __u32 size; /* Total size of the MTD */
131 __u32 oobsize; /* Amount of OOB data per block (e.g. 16) */
132 __u64 padding; /* Old obsolete field; do not use */
135 struct region_info_user {
136 __u32 offset; /* At which this region starts,
137 * from the beginning of the MTD */
138 __u32 erasesize; /* For this region */
139 __u32 numblocks; /* Number of blocks in this region */
150 * Note, the following ioctl existed in the past and was removed:
151 * #define MEMSETOOBSEL _IOW('M', 9, struct nand_oobinfo)
152 * Try to avoid adding a new ioctl with the same ioctl number.
155 /* Get basic MTD characteristics info (better to use sysfs) */
156 #define MEMGETINFO _IOR('M', 1, struct mtd_info_user)
157 /* Erase segment of MTD */
158 #define MEMERASE _IOW('M', 2, struct erase_info_user)
159 /* Write out-of-band data from MTD */
160 #define MEMWRITEOOB _IOWR('M', 3, struct mtd_oob_buf)
161 /* Read out-of-band data from MTD */
162 #define MEMREADOOB _IOWR('M', 4, struct mtd_oob_buf)
163 /* Lock a chip (for MTD that supports it) */
164 #define MEMLOCK _IOW('M', 5, struct erase_info_user)
165 /* Unlock a chip (for MTD that supports it) */
166 #define MEMUNLOCK _IOW('M', 6, struct erase_info_user)
167 /* Get the number of different erase regions */
168 #define MEMGETREGIONCOUNT _IOR('M', 7, int)
169 /* Get information about the erase region for a specific index */
170 #define MEMGETREGIONINFO _IOWR('M', 8, struct region_info_user)
171 /* Get info about OOB modes (e.g., RAW, PLACE, AUTO) - legacy interface */
172 #define MEMGETOOBSEL _IOR('M', 10, struct nand_oobinfo)
173 /* Check if an eraseblock is bad */
174 #define MEMGETBADBLOCK _IOW('M', 11, __kernel_loff_t)
175 /* Mark an eraseblock as bad */
176 #define MEMSETBADBLOCK _IOW('M', 12, __kernel_loff_t)
177 /* Set OTP (One-Time Programmable) mode (factory vs. user) */
178 #define OTPSELECT _IOR('M', 13, int)
179 /* Get number of OTP (One-Time Programmable) regions */
180 #define OTPGETREGIONCOUNT _IOW('M', 14, int)
181 /* Get all OTP (One-Time Programmable) info about MTD */
182 #define OTPGETREGIONINFO _IOW('M', 15, struct otp_info)
183 /* Lock a given range of user data (must be in mode %MTD_FILE_MODE_OTP_USER) */
184 #define OTPLOCK _IOR('M', 16, struct otp_info)
185 /* Get ECC layout (deprecated) */
186 #define ECCGETLAYOUT _IOR('M', 17, struct nand_ecclayout_user)
187 /* Get statistics about corrected/uncorrected errors */
188 #define ECCGETSTATS _IOR('M', 18, struct mtd_ecc_stats)
189 /* Set MTD mode on a per-file-descriptor basis (see "MTD file modes") */
190 #define MTDFILEMODE _IO('M', 19)
191 /* Erase segment of MTD (supports 64-bit address) */
192 #define MEMERASE64 _IOW('M', 20, struct erase_info_user64)
193 /* Write data to OOB (64-bit version) */
194 #define MEMWRITEOOB64 _IOWR('M', 21, struct mtd_oob_buf64)
195 /* Read data from OOB (64-bit version) */
196 #define MEMREADOOB64 _IOWR('M', 22, struct mtd_oob_buf64)
197 /* Check if chip is locked (for MTD that supports it) */
198 #define MEMISLOCKED _IOR('M', 23, struct erase_info_user)
200 * Most generic write interface; can write in-band and/or out-of-band in various
201 * modes (see "struct mtd_write_req"). This ioctl is not supported for flashes
202 * without OOB, e.g., NOR flash.
204 #define MEMWRITE _IOWR('M', 24, struct mtd_write_req)
207 * Obsolete legacy interface. Keep it in order not to break userspace
210 struct nand_oobinfo {
217 struct nand_oobfree {
222 #define MTD_MAX_OOBFREE_ENTRIES 8
223 #define MTD_MAX_ECCPOS_ENTRIES 64
225 * OBSOLETE: ECC layout control structure. Exported to user-space via ioctl
226 * ECCGETLAYOUT for backwards compatbility and should not be mistaken as a
227 * complete set of ECC information. The ioctl truncates the larger internal
228 * structure to retain binary compatibility with the static declaration of the
229 * ioctl. Note that the "MTD_MAX_..._ENTRIES" macros represent the max size of
230 * the user struct, not the MAX size of the internal struct nand_ecclayout.
232 struct nand_ecclayout_user {
234 __u32 eccpos[MTD_MAX_ECCPOS_ENTRIES];
236 struct nand_oobfree oobfree[MTD_MAX_OOBFREE_ENTRIES];
240 * struct mtd_ecc_stats - error correction stats
242 * @corrected: number of corrected bits
243 * @failed: number of uncorrectable errors
244 * @badblocks: number of bad blocks in this partition
245 * @bbtblocks: number of blocks reserved for bad block tables
247 struct mtd_ecc_stats {
255 * MTD file modes - for read/write access to MTD
257 * @MTD_FILE_MODE_NORMAL: OTP disabled, ECC enabled
258 * @MTD_FILE_MODE_OTP_FACTORY: OTP enabled in factory mode
259 * @MTD_FILE_MODE_OTP_USER: OTP enabled in user mode
260 * @MTD_FILE_MODE_RAW: OTP disabled, ECC disabled
262 * These modes can be set via ioctl(MTDFILEMODE). The mode mode will be retained
263 * separately for each open file descriptor.
265 * Note: %MTD_FILE_MODE_RAW provides the same functionality as %MTD_OPS_RAW -
266 * raw access to the flash, without error correction or autoplacement schemes.
267 * Wherever possible, the MTD_OPS_* mode will override the MTD_FILE_MODE_* mode
268 * (e.g., when using ioctl(MEMWRITE)), but in some cases, the MTD_FILE_MODE is
269 * used out of necessity (e.g., `write()', ioctl(MEMWRITEOOB64)).
271 enum mtd_file_modes {
272 MTD_FILE_MODE_NORMAL = MTD_OTP_OFF,
273 MTD_FILE_MODE_OTP_FACTORY = MTD_OTP_FACTORY,
274 MTD_FILE_MODE_OTP_USER = MTD_OTP_USER,
278 #endif /* __MTD_ABI_H__ */