include/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
  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__ */