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 98 #define MTD_DATAFLASH 6 99 #define MTD_UBIVOLUME 7 100 #define MTD_MLCNANDFLASH 8 101 102 #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) 112 113 /* 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 119 120 /* OTP mode selection */ 121 #define MTD_OTP_OFF 0 122 #define MTD_OTP_FACTORY 1 123 #define MTD_OTP_USER 2 124 125 struct mtd_info_user { 126 __u8 type; 127 __u32 flags; 128 __u32 size; /* Total size of the MTD */ 129 __u32 erasesize; 130 __u32 writesize; 131 __u32 oobsize; /* Amount of OOB data per block (e.g. 16) */ 132 __u64 padding; /* Old obsolete field; do not use */ 133 }; 134 135 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 */ 140 __u32 regionindex; 141 }; 142 143 struct otp_info { 144 __u32 start; 145 __u32 length; 146 __u32 locked; 147 }; 148 149 /* 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. 153 */ 154 155 /* 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) 199 /* 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. 203 */ 204 #define MEMWRITE _IOWR('M', 24, struct mtd_write_req) 205 206 /* 207 * Obsolete legacy interface. Keep it in order not to break userspace 208 * interfaces 209 */ 210 struct nand_oobinfo { 211 __u32 useecc; 212 __u32 eccbytes; 213 __u32 oobfree[8][2]; 214 __u32 eccpos[32]; 215 }; 216 217 struct nand_oobfree { 218 __u32 offset; 219 __u32 length; 220 }; 221 222 #define MTD_MAX_OOBFREE_ENTRIES 8 223 #define MTD_MAX_ECCPOS_ENTRIES 64 224 /* 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. 231 */ 232 struct nand_ecclayout_user { 233 __u32 eccbytes; 234 __u32 eccpos[MTD_MAX_ECCPOS_ENTRIES]; 235 __u32 oobavail; 236 struct nand_oobfree oobfree[MTD_MAX_OOBFREE_ENTRIES]; 237 }; 238 239 /** 240 * struct mtd_ecc_stats - error correction stats 241 * 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 246 */ 247 struct mtd_ecc_stats { 248 __u32 corrected; 249 __u32 failed; 250 __u32 badblocks; 251 __u32 bbtblocks; 252 }; 253 254 /* 255 * MTD file modes - for read/write access to MTD 256 * 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 261 * 262 * These modes can be set via ioctl(MTDFILEMODE). The mode mode will be retained 263 * separately for each open file descriptor. 264 * 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)). 270 */ 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, 275 MTD_FILE_MODE_RAW, 276 }; 277 278 #endif /* __MTD_ABI_H__ */ 279