include/mtd/mtd-abi.h

   1 /*
   2  * $Id: mtd-abi.h,v 1.13 2005/11/07 11:14:56 gleixner Exp $
   3  *
   4  * Portions of MTD ABI definition which are shared by kernel and user space
   5  */
   6
   7 #ifndef __MTD_ABI_H__
   8 #define __MTD_ABI_H__
   9
  10 struct erase_info_user {
  11         uint32_t start;
  12         uint32_t length;
  13 };
  14
  15 struct mtd_oob_buf {
  16         uint32_t start;
  17         uint32_t 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
  28 #define MTD_WRITEABLE           0x400   /* Device is writeable */
  29 #define MTD_BIT_WRITEABLE       0x800   /* Single bits can be flipped */
  30 #define MTD_NO_ERASE            0x1000  /* No erase necessary */
  31 #define MTD_STUPID_LOCK         0x2000  /* Always locked after reset */
  32
  33 // Some common devices / combinations of capabilities
  34 #define MTD_CAP_ROM             0
  35 #define MTD_CAP_RAM             (MTD_WRITEABLE | MTD_BIT_WRITEABLE | MTD_NO_ERASE)
  36 #define MTD_CAP_NORFLASH        (MTD_WRITEABLE | MTD_BIT_WRITEABLE)
  37 #define MTD_CAP_NANDFLASH       (MTD_WRITEABLE)
  38
  39
  40 // Types of automatic ECC/Checksum available
  41 #define MTD_ECC_NONE            0       // No automatic ECC available
  42 #define MTD_ECC_RS_DiskOnChip   1       // Automatic ECC on DiskOnChip
  43 #define MTD_ECC_SW              2       // SW ECC for Toshiba & Samsung devices
  44
  45 /* ECC byte placement */
  46 #define MTD_NANDECC_OFF         0       // Switch off ECC (Not recommended)
  47 #define MTD_NANDECC_PLACE       1       // Use the given placement in the structure (YAFFS1 legacy mode)
  48 #define MTD_NANDECC_AUTOPLACE   2       // Use the default placement scheme
  49 #define MTD_NANDECC_PLACEONLY   3       // Use the given placement in the structure (Do not store ecc result on read)
  50 #define MTD_NANDECC_AUTOPL_USR  4       // Use the given autoplacement scheme rather than using the default
  51
  52 /* OTP mode selection */
  53 #define MTD_OTP_OFF             0
  54 #define MTD_OTP_FACTORY         1
  55 #define MTD_OTP_USER            2
  56
  57 struct mtd_info_user {
  58         uint8_t type;
  59         uint32_t flags;
  60         uint32_t size;   // Total size of the MTD
  61         uint32_t erasesize;
  62         uint32_t writesize;
  63         uint32_t oobsize;   // Amount of OOB data per block (e.g. 16)
  64         uint32_t ecctype;
  65         uint32_t eccsize;
  66 };
  67
  68 struct region_info_user {
  69         uint32_t offset;                /* At which this region starts,
  70                                          * from the beginning of the MTD */
  71         uint32_t erasesize;             /* For this region */
  72         uint32_t numblocks;             /* Number of blocks in this region */
  73         uint32_t regionindex;
  74 };
  75
  76 struct otp_info {
  77         uint32_t start;
  78         uint32_t length;
  79         uint32_t locked;
  80 };
  81
  82 #define MEMGETINFO              _IOR('M', 1, struct mtd_info_user)
  83 #define MEMERASE                _IOW('M', 2, struct erase_info_user)
  84 #define MEMWRITEOOB             _IOWR('M', 3, struct mtd_oob_buf)
  85 #define MEMREADOOB              _IOWR('M', 4, struct mtd_oob_buf)
  86 #define MEMLOCK                 _IOW('M', 5, struct erase_info_user)
  87 #define MEMUNLOCK               _IOW('M', 6, struct erase_info_user)
  88 #define MEMGETREGIONCOUNT       _IOR('M', 7, int)
  89 #define MEMGETREGIONINFO        _IOWR('M', 8, struct region_info_user)
  90 #define MEMSETOOBSEL            _IOW('M', 9, struct nand_oobinfo)
  91 #define MEMGETOOBSEL            _IOR('M', 10, struct nand_oobinfo)
  92 #define MEMGETBADBLOCK          _IOW('M', 11, loff_t)
  93 #define MEMSETBADBLOCK          _IOW('M', 12, loff_t)
  94 #define OTPSELECT               _IOR('M', 13, int)
  95 #define OTPGETREGIONCOUNT       _IOW('M', 14, int)
  96 #define OTPGETREGIONINFO        _IOW('M', 15, struct otp_info)
  97 #define OTPLOCK                 _IOR('M', 16, struct otp_info)
  98 #define ECCGETLAYOUT            _IOR('M', 17, struct nand_ecclayout)
  99 #define ECCGETSTATS             _IOR('M', 18, struct mtd_ecc_stats)
 100 #define MTDFILEMODE             _IO('M', 19)
 101
 102 /*
 103  * Obsolete legacy interface. Keep it in order not to break userspace
 104  * interfaces
 105  */
 106 struct nand_oobinfo {
 107         uint32_t useecc;
 108         uint32_t eccbytes;
 109         uint32_t oobfree[8][2];
 110         uint32_t eccpos[32];
 111 };
 112
 113 struct nand_oobfree {
 114         uint32_t offset;
 115         uint32_t length;
 116 };
 117
 118 #define MTD_MAX_OOBFREE_ENTRIES 8
 119 /*
 120  * ECC layout control structure. Exported to userspace for
 121  * diagnosis and to allow creation of raw images
 122  */
 123 struct nand_ecclayout {
 124         uint32_t eccbytes;
 125         uint32_t eccpos[64];
 126         uint32_t oobavail;
 127         struct nand_oobfree oobfree[MTD_MAX_OOBFREE_ENTRIES];
 128 };
 129
 130 /**
 131  * struct mtd_ecc_stats - error correction stats
 132  *
 133  * @corrected:  number of corrected bits
 134  * @failed:     number of uncorrectable errors
 135  * @badblocks:  number of bad blocks in this partition
 136  * @bbtblocks:  number of blocks reserved for bad block tables
 137  */
 138 struct mtd_ecc_stats {
 139         uint32_t corrected;
 140         uint32_t failed;
 141         uint32_t badblocks;
 142         uint32_t bbtblocks;
 143 };
 144
 145 /*
 146  * Read/write file modes for access to MTD
 147  */
 148 enum mtd_file_modes {
 149         MTD_MODE_NORMAL = MTD_OTP_OFF,
 150         MTD_MODE_OTP_FACTORY = MTD_OTP_FACTORY,
 151         MTD_MODE_OTP_USER = MTD_OTP_USER,
 152         MTD_MODE_RAW,
 153 };
 154
 155 #endif /* __MTD_ABI_H__ */