include/uapi/mtd/mtd-abi.h

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