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 struct erase_info_user {
   9         uint32_t start;
  10         uint32_t length;
  11 };
  12
  13 struct mtd_oob_buf {
  14         uint32_t start;
  15         uint32_t length;
  16         unsigned char __user *ptr;
  17 };
  18
  19 #define MTD_ABSENT              0
  20 #define MTD_RAM                 1
  21 #define MTD_ROM                 2
  22 #define MTD_NORFLASH            3
  23 #define MTD_NANDFLASH           4
  24 #define MTD_DATAFLASH           6
  25 #define MTD_UBIVOLUME           7
  26
  27 #define MTD_WRITEABLE           0x400   /* Device is writeable */
  28 #define MTD_BIT_WRITEABLE       0x800   /* Single bits can be flipped */
  29 #define MTD_NO_ERASE            0x1000  /* No erase necessary */
  30 #define MTD_POWERUP_LOCK        0x2000  /* Always locked after reset */
  31
  32 // Some common devices / combinations of capabilities
  33 #define MTD_CAP_ROM             0
  34 #define MTD_CAP_RAM             (MTD_WRITEABLE | MTD_BIT_WRITEABLE | MTD_NO_ERASE)
  35 #define MTD_CAP_NORFLASH        (MTD_WRITEABLE | MTD_BIT_WRITEABLE)
  36 #define MTD_CAP_NANDFLASH       (MTD_WRITEABLE)
  37
  38 /* ECC byte placement */
  39 #define MTD_NANDECC_OFF         0       // Switch off ECC (Not recommended)
  40 #define MTD_NANDECC_PLACE       1       // Use the given placement in the structure (YAFFS1 legacy mode)
  41 #define MTD_NANDECC_AUTOPLACE   2       // Use the default placement scheme
  42 #define MTD_NANDECC_PLACEONLY   3       // Use the given placement in the structure (Do not store ecc result on read)
  43 #define MTD_NANDECC_AUTOPL_USR  4       // Use the given autoplacement scheme rather than using the default
  44
  45 /* OTP mode selection */
  46 #define MTD_OTP_OFF             0
  47 #define MTD_OTP_FACTORY         1
  48 #define MTD_OTP_USER            2
  49
  50 struct mtd_info_user {
  51         uint8_t type;
  52         uint32_t flags;
  53         uint32_t size;   // Total size of the MTD
  54         uint32_t erasesize;
  55         uint32_t writesize;
  56         uint32_t oobsize;   // Amount of OOB data per block (e.g. 16)
  57         /* The below two fields are obsolete and broken, do not use them
  58          * (TODO: remove at some point) */
  59         uint32_t ecctype;
  60         uint32_t eccsize;
  61 };
  62
  63 struct region_info_user {
  64         uint32_t offset;                /* At which this region starts,
  65                                          * from the beginning of the MTD */
  66         uint32_t erasesize;             /* For this region */
  67         uint32_t numblocks;             /* Number of blocks in this region */
  68         uint32_t regionindex;
  69 };
  70
  71 struct otp_info {
  72         uint32_t start;
  73         uint32_t length;
  74         uint32_t locked;
  75 };
  76
  77 #define MEMGETINFO              _IOR('M', 1, struct mtd_info_user)
  78 #define MEMERASE                _IOW('M', 2, struct erase_info_user)
  79 #define MEMWRITEOOB             _IOWR('M', 3, struct mtd_oob_buf)
  80 #define MEMREADOOB              _IOWR('M', 4, struct mtd_oob_buf)
  81 #define MEMLOCK                 _IOW('M', 5, struct erase_info_user)
  82 #define MEMUNLOCK               _IOW('M', 6, struct erase_info_user)
  83 #define MEMGETREGIONCOUNT       _IOR('M', 7, int)
  84 #define MEMGETREGIONINFO        _IOWR('M', 8, struct region_info_user)
  85 #define MEMSETOOBSEL            _IOW('M', 9, struct nand_oobinfo)
  86 #define MEMGETOOBSEL            _IOR('M', 10, struct nand_oobinfo)
  87 #define MEMGETBADBLOCK          _IOW('M', 11, loff_t)
  88 #define MEMSETBADBLOCK          _IOW('M', 12, loff_t)
  89 #define OTPSELECT               _IOR('M', 13, int)
  90 #define OTPGETREGIONCOUNT       _IOW('M', 14, int)
  91 #define OTPGETREGIONINFO        _IOW('M', 15, struct otp_info)
  92 #define OTPLOCK                 _IOR('M', 16, struct otp_info)
  93 #define ECCGETLAYOUT            _IOR('M', 17, struct nand_ecclayout)
  94 #define ECCGETSTATS             _IOR('M', 18, struct mtd_ecc_stats)
  95 #define MTDFILEMODE             _IO('M', 19)
  96
  97 /*
  98  * Obsolete legacy interface. Keep it in order not to break userspace
  99  * interfaces
 100  */
 101 struct nand_oobinfo {
 102         uint32_t useecc;
 103         uint32_t eccbytes;
 104         uint32_t oobfree[8][2];
 105         uint32_t eccpos[32];
 106 };
 107
 108 struct nand_oobfree {
 109         uint32_t offset;
 110         uint32_t length;
 111 };
 112
 113 #define MTD_MAX_OOBFREE_ENTRIES 8
 114 /*
 115  * ECC layout control structure. Exported to userspace for
 116  * diagnosis and to allow creation of raw images
 117  */
 118 struct nand_ecclayout {
 119         uint32_t eccbytes;
 120         uint32_t eccpos[64];
 121         uint32_t oobavail;
 122         struct nand_oobfree oobfree[MTD_MAX_OOBFREE_ENTRIES];
 123 };
 124
 125 /**
 126  * struct mtd_ecc_stats - error correction stats
 127  *
 128  * @corrected:  number of corrected bits
 129  * @failed:     number of uncorrectable errors
 130  * @badblocks:  number of bad blocks in this partition
 131  * @bbtblocks:  number of blocks reserved for bad block tables
 132  */
 133 struct mtd_ecc_stats {
 134         uint32_t corrected;
 135         uint32_t failed;
 136         uint32_t badblocks;
 137         uint32_t bbtblocks;
 138 };
 139
 140 /*
 141  * Read/write file modes for access to MTD
 142  */
 143 enum mtd_file_modes {
 144         MTD_MODE_NORMAL = MTD_OTP_OFF,
 145         MTD_MODE_OTP_FACTORY = MTD_OTP_FACTORY,
 146         MTD_MODE_OTP_USER = MTD_OTP_USER,
 147         MTD_MODE_RAW,
 148 };
 149
 150 #endif /* __MTD_ABI_H__ */