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