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 #define MTD_ABSENT              0
  49 #define MTD_RAM                 1
  50 #define MTD_ROM                 2
  51 #define MTD_NORFLASH            3
  52 #define MTD_NANDFLASH           4
  53 #define MTD_DATAFLASH           6
  54 #define MTD_UBIVOLUME           7
  55 #define MTD_MLCNANDFLASH        8
  56
  57 #define MTD_WRITEABLE           0x400   /* Device is writeable */
  58 #define MTD_BIT_WRITEABLE       0x800   /* Single bits can be flipped */
  59 #define MTD_NO_ERASE            0x1000  /* No erase necessary */
  60 #define MTD_POWERUP_LOCK        0x2000  /* Always locked after reset */
  61
  62 // Some common devices / combinations of capabilities
  63 #define MTD_CAP_ROM             0
  64 #define MTD_CAP_RAM             (MTD_WRITEABLE | MTD_BIT_WRITEABLE | MTD_NO_ERASE)
  65 #define MTD_CAP_NORFLASH        (MTD_WRITEABLE | MTD_BIT_WRITEABLE)
  66 #define MTD_CAP_NANDFLASH       (MTD_WRITEABLE)
  67
  68 /* ECC byte placement */
  69 #define MTD_NANDECC_OFF         0       // Switch off ECC (Not recommended)
  70 #define MTD_NANDECC_PLACE       1       // Use the given placement in the structure (YAFFS1 legacy mode)
  71 #define MTD_NANDECC_AUTOPLACE   2       // Use the default placement scheme
  72 #define MTD_NANDECC_PLACEONLY   3       // Use the given placement in the structure (Do not store ecc result on read)
  73 #define MTD_NANDECC_AUTOPL_USR  4       // Use the given autoplacement scheme rather than using the default
  74
  75 /* OTP mode selection */
  76 #define MTD_OTP_OFF             0
  77 #define MTD_OTP_FACTORY         1
  78 #define MTD_OTP_USER            2
  79
  80 struct mtd_info_user {
  81         __u8 type;
  82         __u32 flags;
  83         __u32 size;      // Total size of the MTD
  84         __u32 erasesize;
  85         __u32 writesize;
  86         __u32 oobsize;   // Amount of OOB data per block (e.g. 16)
  87         /* The below two fields are obsolete and broken, do not use them
  88          * (TODO: remove at some point) */
  89         __u32 ecctype;
  90         __u32 eccsize;
  91 };
  92
  93 struct region_info_user {
  94         __u32 offset;           /* At which this region starts,
  95                                          * from the beginning of the MTD */
  96         __u32 erasesize;                /* For this region */
  97         __u32 numblocks;                /* Number of blocks in this region */
  98         __u32 regionindex;
  99 };
 100
 101 struct otp_info {
 102         __u32 start;
 103         __u32 length;
 104         __u32 locked;
 105 };
 106
 107 /*
 108  * Note, the following ioctl existed in the past and was removed:
 109  * #define MEMSETOOBSEL           _IOW('M', 9, struct nand_oobinfo)
 110  * Try to avoid adding a new ioctl with the same ioctl number.
 111  */
 112
 113 #define MEMGETINFO              _IOR('M', 1, struct mtd_info_user)
 114 #define MEMERASE                _IOW('M', 2, struct erase_info_user)
 115 #define MEMWRITEOOB             _IOWR('M', 3, struct mtd_oob_buf)
 116 #define MEMREADOOB              _IOWR('M', 4, struct mtd_oob_buf)
 117 #define MEMLOCK                 _IOW('M', 5, struct erase_info_user)
 118 #define MEMUNLOCK               _IOW('M', 6, struct erase_info_user)
 119 #define MEMGETREGIONCOUNT       _IOR('M', 7, int)
 120 #define MEMGETREGIONINFO        _IOWR('M', 8, struct region_info_user)
 121 #define MEMGETOOBSEL            _IOR('M', 10, struct nand_oobinfo)
 122 #define MEMGETBADBLOCK          _IOW('M', 11, __kernel_loff_t)
 123 #define MEMSETBADBLOCK          _IOW('M', 12, __kernel_loff_t)
 124 #define OTPSELECT               _IOR('M', 13, int)
 125 #define OTPGETREGIONCOUNT       _IOW('M', 14, int)
 126 #define OTPGETREGIONINFO        _IOW('M', 15, struct otp_info)
 127 #define OTPLOCK                 _IOR('M', 16, struct otp_info)
 128 #define ECCGETLAYOUT            _IOR('M', 17, struct nand_ecclayout_user)
 129 #define ECCGETSTATS             _IOR('M', 18, struct mtd_ecc_stats)
 130 #define MTDFILEMODE             _IO('M', 19)
 131 #define MEMERASE64              _IOW('M', 20, struct erase_info_user64)
 132 #define MEMWRITEOOB64           _IOWR('M', 21, struct mtd_oob_buf64)
 133 #define MEMREADOOB64            _IOWR('M', 22, struct mtd_oob_buf64)
 134 #define MEMISLOCKED             _IOR('M', 23, struct erase_info_user)
 135
 136 /*
 137  * Obsolete legacy interface. Keep it in order not to break userspace
 138  * interfaces
 139  */
 140 struct nand_oobinfo {
 141         __u32 useecc;
 142         __u32 eccbytes;
 143         __u32 oobfree[8][2];
 144         __u32 eccpos[32];
 145 };
 146
 147 struct nand_oobfree {
 148         __u32 offset;
 149         __u32 length;
 150 };
 151
 152 #define MTD_MAX_OOBFREE_ENTRIES 8
 153 #define MTD_MAX_ECCPOS_ENTRIES  64
 154 /*
 155  * OBSOLETE: ECC layout control structure. Exported to user-space via ioctl
 156  * ECCGETLAYOUT for backwards compatbility and should not be mistaken as a
 157  * complete set of ECC information. The ioctl truncates the larger internal
 158  * structure to retain binary compatibility with the static declaration of the
 159  * ioctl. Note that the "MTD_MAX_..._ENTRIES" macros represent the max size of
 160  * the user struct, not the MAX size of the internal struct nand_ecclayout.
 161  */
 162 struct nand_ecclayout_user {
 163         __u32 eccbytes;
 164         __u32 eccpos[MTD_MAX_ECCPOS_ENTRIES];
 165         __u32 oobavail;
 166         struct nand_oobfree oobfree[MTD_MAX_OOBFREE_ENTRIES];
 167 };
 168
 169 /**
 170  * struct mtd_ecc_stats - error correction stats
 171  *
 172  * @corrected:  number of corrected bits
 173  * @failed:     number of uncorrectable errors
 174  * @badblocks:  number of bad blocks in this partition
 175  * @bbtblocks:  number of blocks reserved for bad block tables
 176  */
 177 struct mtd_ecc_stats {
 178         __u32 corrected;
 179         __u32 failed;
 180         __u32 badblocks;
 181         __u32 bbtblocks;
 182 };
 183
 184 /*
 185  * Read/write file modes for access to MTD
 186  */
 187 enum mtd_file_modes {
 188         MTD_MODE_NORMAL = MTD_OTP_OFF,
 189         MTD_MODE_OTP_FACTORY = MTD_OTP_FACTORY,
 190         MTD_MODE_OTP_USER = MTD_OTP_USER,
 191         MTD_MODE_RAW,
 192 };
 193
 194 #endif /* __MTD_ABI_H__ */