include/uapi/mtd/mtd-abi.h

   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 #define MTD_SLC_ON_MLC_EMULATION 0x4000 /* Emulate SLC behavior on MLC NANDs */
 108
 109 /* Some common devices / combinations of capabilities */
 110 #define MTD_CAP_ROM             0
 111 #define MTD_CAP_RAM             (MTD_WRITEABLE | MTD_BIT_WRITEABLE | MTD_NO_ERASE)
 112 #define MTD_CAP_NORFLASH        (MTD_WRITEABLE | MTD_BIT_WRITEABLE)
 113 #define MTD_CAP_NANDFLASH       (MTD_WRITEABLE)
 114 #define MTD_CAP_NVRAM           (MTD_WRITEABLE | MTD_BIT_WRITEABLE | MTD_NO_ERASE)
 115
 116 /* Obsolete ECC byte placement modes (used with obsolete MEMGETOOBSEL) */
 117 #define MTD_NANDECC_OFF         0       /* Switch off ECC (Not recommended) */
 118 #define MTD_NANDECC_PLACE       1       /* Use the given placement in the structure (YAFFS1 legacy mode) */
 119 #define MTD_NANDECC_AUTOPLACE   2       /* Use the default placement scheme */
 120 #define MTD_NANDECC_PLACEONLY   3       /* Use the given placement in the structure (Do not store ecc result on read) */
 121 #define MTD_NANDECC_AUTOPL_USR  4       /* Use the given autoplacement scheme rather than using the default */
 122
 123 /* OTP mode selection */
 124 #define MTD_OTP_OFF             0
 125 #define MTD_OTP_FACTORY         1
 126 #define MTD_OTP_USER            2
 127
 128 struct mtd_info_user {
 129         __u8 type;
 130         __u32 flags;
 131         __u32 size;     /* Total size of the MTD */
 132         __u32 erasesize;
 133         __u32 writesize;
 134         __u32 oobsize;  /* Amount of OOB data per block (e.g. 16) */
 135         __u64 padding;  /* Old obsolete field; do not use */
 136 };
 137
 138 struct region_info_user {
 139         __u32 offset;           /* At which this region starts,
 140                                  * from the beginning of the MTD */
 141         __u32 erasesize;        /* For this region */
 142         __u32 numblocks;        /* Number of blocks in this region */
 143         __u32 regionindex;
 144 };
 145
 146 struct otp_info {
 147         __u32 start;
 148         __u32 length;
 149         __u32 locked;
 150 };
 151
 152 /*
 153  * Note, the following ioctl existed in the past and was removed:
 154  * #define MEMSETOOBSEL           _IOW('M', 9, struct nand_oobinfo)
 155  * Try to avoid adding a new ioctl with the same ioctl number.
 156  */
 157
 158 /* Get basic MTD characteristics info (better to use sysfs) */
 159 #define MEMGETINFO              _IOR('M', 1, struct mtd_info_user)
 160 /* Erase segment of MTD */
 161 #define MEMERASE                _IOW('M', 2, struct erase_info_user)
 162 /* Write out-of-band data from MTD */
 163 #define MEMWRITEOOB             _IOWR('M', 3, struct mtd_oob_buf)
 164 /* Read out-of-band data from MTD */
 165 #define MEMREADOOB              _IOWR('M', 4, struct mtd_oob_buf)
 166 /* Lock a chip (for MTD that supports it) */
 167 #define MEMLOCK                 _IOW('M', 5, struct erase_info_user)
 168 /* Unlock a chip (for MTD that supports it) */
 169 #define MEMUNLOCK               _IOW('M', 6, struct erase_info_user)
 170 /* Get the number of different erase regions */
 171 #define MEMGETREGIONCOUNT       _IOR('M', 7, int)
 172 /* Get information about the erase region for a specific index */
 173 #define MEMGETREGIONINFO        _IOWR('M', 8, struct region_info_user)
 174 /* Get info about OOB modes (e.g., RAW, PLACE, AUTO) - legacy interface */
 175 #define MEMGETOOBSEL            _IOR('M', 10, struct nand_oobinfo)
 176 /* Check if an eraseblock is bad */
 177 #define MEMGETBADBLOCK          _IOW('M', 11, __kernel_loff_t)
 178 /* Mark an eraseblock as bad */
 179 #define MEMSETBADBLOCK          _IOW('M', 12, __kernel_loff_t)
 180 /* Set OTP (One-Time Programmable) mode (factory vs. user) */
 181 #define OTPSELECT               _IOR('M', 13, int)
 182 /* Get number of OTP (One-Time Programmable) regions */
 183 #define OTPGETREGIONCOUNT       _IOW('M', 14, int)
 184 /* Get all OTP (One-Time Programmable) info about MTD */
 185 #define OTPGETREGIONINFO        _IOW('M', 15, struct otp_info)
 186 /* Lock a given range of user data (must be in mode %MTD_FILE_MODE_OTP_USER) */
 187 #define OTPLOCK                 _IOR('M', 16, struct otp_info)
 188 /* Get ECC layout (deprecated) */
 189 #define ECCGETLAYOUT            _IOR('M', 17, struct nand_ecclayout_user)
 190 /* Get statistics about corrected/uncorrected errors */
 191 #define ECCGETSTATS             _IOR('M', 18, struct mtd_ecc_stats)
 192 /* Set MTD mode on a per-file-descriptor basis (see "MTD file modes") */
 193 #define MTDFILEMODE             _IO('M', 19)
 194 /* Erase segment of MTD (supports 64-bit address) */
 195 #define MEMERASE64              _IOW('M', 20, struct erase_info_user64)
 196 /* Write data to OOB (64-bit version) */
 197 #define MEMWRITEOOB64           _IOWR('M', 21, struct mtd_oob_buf64)
 198 /* Read data from OOB (64-bit version) */
 199 #define MEMREADOOB64            _IOWR('M', 22, struct mtd_oob_buf64)
 200 /* Check if chip is locked (for MTD that supports it) */
 201 #define MEMISLOCKED             _IOR('M', 23, struct erase_info_user)
 202 /*
 203  * Most generic write interface; can write in-band and/or out-of-band in various
 204  * modes (see "struct mtd_write_req"). This ioctl is not supported for flashes
 205  * without OOB, e.g., NOR flash.
 206  */
 207 #define MEMWRITE                _IOWR('M', 24, struct mtd_write_req)
 208
 209 /*
 210  * Obsolete legacy interface. Keep it in order not to break userspace
 211  * interfaces
 212  */
 213 struct nand_oobinfo {
 214         __u32 useecc;
 215         __u32 eccbytes;
 216         __u32 oobfree[8][2];
 217         __u32 eccpos[32];
 218 };
 219
 220 struct nand_oobfree {
 221         __u32 offset;
 222         __u32 length;
 223 };
 224
 225 #define MTD_MAX_OOBFREE_ENTRIES 8
 226 #define MTD_MAX_ECCPOS_ENTRIES  64
 227 /*
 228  * OBSOLETE: ECC layout control structure. Exported to user-space via ioctl
 229  * ECCGETLAYOUT for backwards compatbility and should not be mistaken as a
 230  * complete set of ECC information. The ioctl truncates the larger internal
 231  * structure to retain binary compatibility with the static declaration of the
 232  * ioctl. Note that the "MTD_MAX_..._ENTRIES" macros represent the max size of
 233  * the user struct, not the MAX size of the internal OOB layout representation.
 234  */
 235 struct nand_ecclayout_user {
 236         __u32 eccbytes;
 237         __u32 eccpos[MTD_MAX_ECCPOS_ENTRIES];
 238         __u32 oobavail;
 239         struct nand_oobfree oobfree[MTD_MAX_OOBFREE_ENTRIES];
 240 };
 241
 242 /**
 243  * struct mtd_ecc_stats - error correction stats
 244  *
 245  * @corrected:  number of corrected bits
 246  * @failed:     number of uncorrectable errors
 247  * @badblocks:  number of bad blocks in this partition
 248  * @bbtblocks:  number of blocks reserved for bad block tables
 249  */
 250 struct mtd_ecc_stats {
 251         __u32 corrected;
 252         __u32 failed;
 253         __u32 badblocks;
 254         __u32 bbtblocks;
 255 };
 256
 257 /*
 258  * MTD file modes - for read/write access to MTD
 259  *
 260  * @MTD_FILE_MODE_NORMAL:       OTP disabled, ECC enabled
 261  * @MTD_FILE_MODE_OTP_FACTORY:  OTP enabled in factory mode
 262  * @MTD_FILE_MODE_OTP_USER:     OTP enabled in user mode
 263  * @MTD_FILE_MODE_RAW:          OTP disabled, ECC disabled
 264  *
 265  * These modes can be set via ioctl(MTDFILEMODE). The mode will be retained
 266  * separately for each open file descriptor.
 267  *
 268  * Note: %MTD_FILE_MODE_RAW provides the same functionality as %MTD_OPS_RAW -
 269  * raw access to the flash, without error correction or autoplacement schemes.
 270  * Wherever possible, the MTD_OPS_* mode will override the MTD_FILE_MODE_* mode
 271  * (e.g., when using ioctl(MEMWRITE)), but in some cases, the MTD_FILE_MODE is
 272  * used out of necessity (e.g., `write()', ioctl(MEMWRITEOOB64)).
 273  */
 274 enum mtd_file_modes {
 275         MTD_FILE_MODE_NORMAL = MTD_OTP_OFF,
 276         MTD_FILE_MODE_OTP_FACTORY = MTD_OTP_FACTORY,
 277         MTD_FILE_MODE_OTP_USER = MTD_OTP_USER,
 278         MTD_FILE_MODE_RAW,
 279 };
 280
 281 static inline int mtd_type_is_nand_user(const struct mtd_info_user *mtd)
 282 {
 283         return mtd->type == MTD_NANDFLASH || mtd->type == MTD_MLCNANDFLASH;
 284 }
 285
 286 #endif /* __MTD_ABI_H__ */