include/mtd/mtd-abi.h

   1 /*
   2  * $Id: mtd-abi.h,v 1.5 2004/06/22 09:29:35 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_PEROM               5
  27 #define MTD_OTHER               14
  28 #define MTD_UNKNOWN             15
  29
  30 #define MTD_CLEAR_BITS          1       // Bits can be cleared (flash)
  31 #define MTD_SET_BITS            2       // Bits can be set
  32 #define MTD_ERASEABLE           4       // Has an erase function
  33 #define MTD_WRITEB_WRITEABLE    8       // Direct IO is possible
  34 #define MTD_VOLATILE            16      // Set for RAMs
  35 #define MTD_XIP                 32      // eXecute-In-Place possible
  36 #define MTD_OOB                 64      // Out-of-band data (NAND flash)
  37 #define MTD_ECC                 128     // Device capable of automatic ECC
  38
  39 // Some common devices / combinations of capabilities
  40 #define MTD_CAP_ROM             0
  41 #define MTD_CAP_RAM             (MTD_CLEAR_BITS|MTD_SET_BITS|MTD_WRITEB_WRITEABLE)
  42 #define MTD_CAP_NORFLASH        (MTD_CLEAR_BITS|MTD_ERASEABLE)
  43 #define MTD_CAP_NANDFLASH       (MTD_CLEAR_BITS|MTD_ERASEABLE|MTD_OOB)
  44 #define MTD_WRITEABLE           (MTD_CLEAR_BITS|MTD_SET_BITS)
  45
  46
  47 // Types of automatic ECC/Checksum available
  48 #define MTD_ECC_NONE            0       // No automatic ECC available
  49 #define MTD_ECC_RS_DiskOnChip   1       // Automatic ECC on DiskOnChip
  50 #define MTD_ECC_SW              2       // SW ECC for Toshiba & Samsung devices
  51
  52 /* ECC byte placement */
  53 #define MTD_NANDECC_OFF         0       // Switch off ECC (Not recommended)
  54 #define MTD_NANDECC_PLACE       1       // Use the given placement in the structure (YAFFS1 legacy mode)
  55 #define MTD_NANDECC_AUTOPLACE   2       // Use the default placement scheme
  56 #define MTD_NANDECC_PLACEONLY   3       // Use the given placement in the structure (Do not store ecc result on read)
  57
  58 struct mtd_info_user {
  59         uint8_t type;
  60         uint32_t flags;
  61         uint32_t size;   // Total size of the MTD
  62         uint32_t erasesize;
  63         uint32_t oobblock;  // Size of OOB blocks (e.g. 512)
  64         uint32_t oobsize;   // Amount of OOB data per block (e.g. 16)
  65         uint32_t ecctype;
  66         uint32_t eccsize;
  67 };
  68
  69 struct region_info_user {
  70         uint32_t offset;                /* At which this region starts,
  71                                          * from the beginning of the MTD */
  72         uint32_t erasesize;             /* For this region */
  73         uint32_t numblocks;             /* Number of blocks in this region */
  74         uint32_t regionindex;
  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
  90 struct nand_oobinfo {
  91         uint32_t useecc;
  92         uint32_t eccbytes;
  93         uint32_t oobfree[8][2];
  94         uint32_t eccpos[32];
  95 };
  96
  97 #endif /* __MTD_ABI_H__ */