include/mtd/mtd-abi.h

   1 /*
   2  * Portions of MTD ABI definition which are shared by kernel and user space
   3  */
   4
   5 #ifndef __MTD_ABI_H__
   6 #define __MTD_ABI_H__
   7
   8 #include <linux/types.h>
   9
  10 struct erase_info_user {
  11         __u32 start;
  12         __u32 length;
  13 };
  14
  15 struct mtd_oob_buf {
  16         __u32 start;
  17         __u32 length;
  18         unsigned char __user *ptr;
  19 };
  20
  21 #define MTD_ABSENT              0
  22 #define MTD_RAM                 1
  23 #define MTD_ROM                 2
  24 #define MTD_NORFLASH            3
  25 #define MTD_NANDFLASH           4
  26 #define MTD_DATAFLASH           6
  27 #define MTD_UBIVOLUME           7
  28
  29 #define MTD_WRITEABLE           0x400   /* Device is writeable */
  30 #define MTD_BIT_WRITEABLE       0x800   /* Single bits can be flipped */
  31 #define MTD_NO_ERASE            0x1000  /* No erase necessary */
  32 #define MTD_POWERUP_LOCK        0x2000  /* Always locked after reset */
  33
  34 // Some common devices / combinations of capabilities
  35 #define MTD_CAP_ROM             0
  36 #define MTD_CAP_RAM             (MTD_WRITEABLE | MTD_BIT_WRITEABLE | MTD_NO_ERASE)
  37 #define MTD_CAP_NORFLASH        (MTD_WRITEABLE | MTD_BIT_WRITEABLE)
  38 #define MTD_CAP_NANDFLASH       (MTD_WRITEABLE)
  39
  40 /* ECC byte placement */
  41 #define MTD_NANDECC_OFF         0       // Switch off ECC (Not recommended)
  42 #define MTD_NANDECC_PLACE       1       // Use the given placement in the structure (YAFFS1 legacy mode)
  43 #define MTD_NANDECC_AUTOPLACE   2       // Use the default placement scheme
  44 #define MTD_NANDECC_PLACEONLY   3       // Use the given placement in the structure (Do not store ecc result on read)
  45 #define MTD_NANDECC_AUTOPL_USR  4       // Use the given autoplacement scheme rather than using the default
  46
  47 /* OTP mode selection */
  48 #define MTD_OTP_OFF             0
  49 #define MTD_OTP_FACTORY         1
  50 #define MTD_OTP_USER            2
  51
  52 struct mtd_info_user {
  53         __u8 type;
  54         __u32 flags;
  55         __u32 size;      // Total size of the MTD
  56         __u32 erasesize;
  57         __u32 writesize;
  58         __u32 oobsize;   // Amount of OOB data per block (e.g. 16)
  59         /* The below two fields are obsolete and broken, do not use them
  60          * (TODO: remove at some point) */
  61         __u32 ecctype;
  62         __u32 eccsize;
  63 };
  64
  65 struct region_info_user {
  66         __u32 offset;           /* At which this region starts,
  67                                          * from the beginning of the MTD */
  68         __u32 erasesize;                /* For this region */
  69         __u32 numblocks;                /* Number of blocks in this region */
  70         __u32 regionindex;
  71 };
  72
  73 struct otp_info {
  74         __u32 start;
  75         __u32 length;
  76         __u32 locked;
  77 };
  78
  79 #define MEMGETINFO              _IOR('M', 1, struct mtd_info_user)
  80 #define MEMERASE                _IOW('M', 2, struct erase_info_user)
  81 #define MEMWRITEOOB             _IOWR('M', 3, struct mtd_oob_buf)
  82 #define MEMREADOOB              _IOWR('M', 4, struct mtd_oob_buf)
  83 #define MEMLOCK                 _IOW('M', 5, struct erase_info_user)
  84 #define MEMUNLOCK               _IOW('M', 6, struct erase_info_user)
  85 #define MEMGETREGIONCOUNT       _IOR('M', 7, int)
  86 #define MEMGETREGIONINFO        _IOWR('M', 8, struct region_info_user)
  87 #define MEMSETOOBSEL            _IOW('M', 9, struct nand_oobinfo)
  88 #define MEMGETOOBSEL            _IOR('M', 10, struct nand_oobinfo)
  89 #define MEMGETBADBLOCK          _IOW('M', 11, __kernel_loff_t)
  90 #define MEMSETBADBLOCK          _IOW('M', 12, __kernel_loff_t)
  91 #define OTPSELECT               _IOR('M', 13, int)
  92 #define OTPGETREGIONCOUNT       _IOW('M', 14, int)
  93 #define OTPGETREGIONINFO        _IOW('M', 15, struct otp_info)
  94 #define OTPLOCK                 _IOR('M', 16, struct otp_info)
  95 #define ECCGETLAYOUT            _IOR('M', 17, struct nand_ecclayout)
  96 #define ECCGETSTATS             _IOR('M', 18, struct mtd_ecc_stats)
  97 #define MTDFILEMODE             _IO('M', 19)
  98
  99 /*
 100  * Obsolete legacy interface. Keep it in order not to break userspace
 101  * interfaces
 102  */
 103 struct nand_oobinfo {
 104         __u32 useecc;
 105         __u32 eccbytes;
 106         __u32 oobfree[8][2];
 107         __u32 eccpos[32];
 108 };
 109
 110 struct nand_oobfree {
 111         __u32 offset;
 112         __u32 length;
 113 };
 114
 115 #define MTD_MAX_OOBFREE_ENTRIES 8
 116 /*
 117  * ECC layout control structure. Exported to userspace for
 118  * diagnosis and to allow creation of raw images
 119  */
 120 struct nand_ecclayout {
 121         __u32 eccbytes;
 122         __u32 eccpos[64];
 123         __u32 oobavail;
 124         struct nand_oobfree oobfree[MTD_MAX_OOBFREE_ENTRIES];
 125 };
 126
 127 /**
 128  * struct mtd_ecc_stats - error correction stats
 129  *
 130  * @corrected:  number of corrected bits
 131  * @failed:     number of uncorrectable errors
 132  * @badblocks:  number of bad blocks in this partition
 133  * @bbtblocks:  number of blocks reserved for bad block tables
 134  */
 135 struct mtd_ecc_stats {
 136         __u32 corrected;
 137         __u32 failed;
 138         __u32 badblocks;
 139         __u32 bbtblocks;
 140 };
 141
 142 /*
 143  * Read/write file modes for access to MTD
 144  */
 145 enum mtd_file_modes {
 146         MTD_MODE_NORMAL = MTD_OTP_OFF,
 147         MTD_MODE_OTP_FACTORY = MTD_OTP_FACTORY,
 148         MTD_MODE_OTP_USER = MTD_OTP_USER,
 149         MTD_MODE_RAW,
 150 };
 151
 152 #endif /* __MTD_ABI_H__ */