include/mtd/mtd-abi.h

   1 /*
   2  * $Id: mtd-abi.h,v 1.7 2004/11/23 15:37:32 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 #ifndef __KERNEL__ /* Urgh. The whole point of splitting this out into
  11                     separate files was to avoid #ifdef __KERNEL__ */
  12 #define __user
  13 #endif
  14
  15 struct erase_info_user {
  16         uint32_t start;
  17         uint32_t length;
  18 };
  19
  20 struct mtd_oob_buf {
  21         uint32_t start;
  22         uint32_t length;
  23         unsigned char __user *ptr;
  24 };
  25
  26 #define MTD_ABSENT              0
  27 #define MTD_RAM                 1
  28 #define MTD_ROM                 2
  29 #define MTD_NORFLASH            3
  30 #define MTD_NANDFLASH           4
  31 #define MTD_PEROM               5
  32 #define MTD_OTHER               14
  33 #define MTD_UNKNOWN             15
  34
  35 #define MTD_CLEAR_BITS          1       // Bits can be cleared (flash)
  36 #define MTD_SET_BITS            2       // Bits can be set
  37 #define MTD_ERASEABLE           4       // Has an erase function
  38 #define MTD_WRITEB_WRITEABLE    8       // Direct IO is possible
  39 #define MTD_VOLATILE            16      // Set for RAMs
  40 #define MTD_XIP                 32      // eXecute-In-Place possible
  41 #define MTD_OOB                 64      // Out-of-band data (NAND flash)
  42 #define MTD_ECC                 128     // Device capable of automatic ECC
  43 #define MTD_NO_VIRTBLOCKS       256     // Virtual blocks not allowed
  44
  45 // Some common devices / combinations of capabilities
  46 #define MTD_CAP_ROM             0
  47 #define MTD_CAP_RAM             (MTD_CLEAR_BITS|MTD_SET_BITS|MTD_WRITEB_WRITEABLE)
  48 #define MTD_CAP_NORFLASH        (MTD_CLEAR_BITS|MTD_ERASEABLE)
  49 #define MTD_CAP_NANDFLASH       (MTD_CLEAR_BITS|MTD_ERASEABLE|MTD_OOB)
  50 #define MTD_WRITEABLE           (MTD_CLEAR_BITS|MTD_SET_BITS)
  51
  52
  53 // Types of automatic ECC/Checksum available
  54 #define MTD_ECC_NONE            0       // No automatic ECC available
  55 #define MTD_ECC_RS_DiskOnChip   1       // Automatic ECC on DiskOnChip
  56 #define MTD_ECC_SW              2       // SW ECC for Toshiba & Samsung devices
  57
  58 /* ECC byte placement */
  59 #define MTD_NANDECC_OFF         0       // Switch off ECC (Not recommended)
  60 #define MTD_NANDECC_PLACE       1       // Use the given placement in the structure (YAFFS1 legacy mode)
  61 #define MTD_NANDECC_AUTOPLACE   2       // Use the default placement scheme
  62 #define MTD_NANDECC_PLACEONLY   3       // Use the given placement in the structure (Do not store ecc result on read)
  63
  64 struct mtd_info_user {
  65         uint8_t type;
  66         uint32_t flags;
  67         uint32_t size;   // Total size of the MTD
  68         uint32_t erasesize;
  69         uint32_t oobblock;  // Size of OOB blocks (e.g. 512)
  70         uint32_t oobsize;   // Amount of OOB data per block (e.g. 16)
  71         uint32_t ecctype;
  72         uint32_t eccsize;
  73 };
  74
  75 struct region_info_user {
  76         uint32_t offset;                /* At which this region starts,
  77                                          * from the beginning of the MTD */
  78         uint32_t erasesize;             /* For this region */
  79         uint32_t numblocks;             /* Number of blocks in this region */
  80         uint32_t regionindex;
  81 };
  82
  83 #define MEMGETINFO              _IOR('M', 1, struct mtd_info_user)
  84 #define MEMERASE                _IOW('M', 2, struct erase_info_user)
  85 #define MEMWRITEOOB             _IOWR('M', 3, struct mtd_oob_buf)
  86 #define MEMREADOOB              _IOWR('M', 4, struct mtd_oob_buf)
  87 #define MEMLOCK                 _IOW('M', 5, struct erase_info_user)
  88 #define MEMUNLOCK               _IOW('M', 6, struct erase_info_user)
  89 #define MEMGETREGIONCOUNT       _IOR('M', 7, int)
  90 #define MEMGETREGIONINFO        _IOWR('M', 8, struct region_info_user)
  91 #define MEMSETOOBSEL            _IOW('M', 9, struct nand_oobinfo)
  92 #define MEMGETOOBSEL            _IOR('M', 10, struct nand_oobinfo)
  93 #define MEMGETBADBLOCK          _IOW('M', 11, loff_t)
  94 #define MEMSETBADBLOCK          _IOW('M', 12, loff_t)
  95
  96 struct nand_oobinfo {
  97         uint32_t useecc;
  98         uint32_t eccbytes;
  99         uint32_t oobfree[8][2];
 100         uint32_t eccpos[32];
 101 };
 102
 103 #endif /* __MTD_ABI_H__ */