package/mtd/src/mtd-api.h

   1
   2
   3 #ifndef __MTD_MTD_H__
   4 #define __MTD_MTD_H__
   5
   6 #ifdef __KERNEL__
   7
   8 #include <linux/config.h>
   9 #include <linux/version.h>
  10 #include <linux/types.h>
  11 #include <linux/mtd/compatmac.h>
  12 #include <linux/notifier.h>
  13 #include <linux/module.h>
  14 #include <linux/uio.h>
  15
  16 #endif /* __KERNEL__ */
  17
  18 struct erase_info_user {
  19         u_int32_t start;
  20         u_int32_t length;
  21 };
  22
  23 struct mtd_oob_buf {
  24         u_int32_t start;
  25         u_int32_t length;
  26         unsigned char *ptr;
  27 };
  28
  29
  30 #define MTD_CHAR_MAJOR 90
  31 #define MTD_BLOCK_MAJOR 31
  32 #define MAX_MTD_DEVICES 16
  33
  34
  35
  36 #define MTD_ABSENT              0
  37 #define MTD_RAM                 1
  38 #define MTD_ROM                 2
  39 #define MTD_NORFLASH            3
  40 #define MTD_NANDFLASH           4
  41 #define MTD_PEROM               5
  42 #define MTD_OTHER               14
  43 #define MTD_UNKNOWN             15
  44
  45
  46
  47 #define MTD_CLEAR_BITS          1       // Bits can be cleared (flash)
  48 #define MTD_SET_BITS            2       // Bits can be set
  49 #define MTD_ERASEABLE           4       // Has an erase function
  50 #define MTD_WRITEB_WRITEABLE    8       // Direct IO is possible
  51 #define MTD_VOLATILE            16      // Set for RAMs
  52 #define MTD_XIP                 32      // eXecute-In-Place possible
  53 #define MTD_OOB                 64      // Out-of-band data (NAND flash)
  54 #define MTD_ECC                 128     // Device capable of automatic ECC
  55
  56 // Some common devices / combinations of capabilities
  57 #define MTD_CAP_ROM             0
  58 #define MTD_CAP_RAM             (MTD_CLEAR_BITS|MTD_SET_BITS|MTD_WRITEB_WRITEABLE)
  59 #define MTD_CAP_NORFLASH        (MTD_CLEAR_BITS|MTD_ERASEABLE)
  60 #define MTD_CAP_NANDFLASH       (MTD_CLEAR_BITS|MTD_ERASEABLE|MTD_OOB)
  61 #define MTD_WRITEABLE           (MTD_CLEAR_BITS|MTD_SET_BITS)
  62
  63
  64 // Types of automatic ECC/Checksum available
  65 #define MTD_ECC_NONE            0       // No automatic ECC available
  66 #define MTD_ECC_RS_DiskOnChip   1       // Automatic ECC on DiskOnChip
  67 #define MTD_ECC_SW              2       // SW ECC for Toshiba & Samsung devices
  68
  69 struct mtd_info_user {
  70         u_char type;
  71         u_int32_t flags;
  72         u_int32_t size;  // Total size of the MTD
  73         u_int32_t erasesize;
  74         u_int32_t oobblock;  // Size of OOB blocks (e.g. 512)
  75         u_int32_t oobsize;   // Amount of OOB data per block (e.g. 16)
  76         u_int32_t ecctype;
  77         u_int32_t eccsize;
  78 };
  79
  80 struct region_info_user {
  81         u_int32_t offset;               /* At which this region starts,
  82                                          * from the beginning of the MTD */
  83         u_int32_t erasesize;            /* For this region */
  84         u_int32_t numblocks;            /* Number of blocks in this region */
  85         u_int32_t regionindex;
  86 };
  87
  88 #define MEMGETINFO              _IOR('M', 1, struct mtd_info_user)
  89 #define MEMERASE                _IOW('M', 2, struct erase_info_user)
  90 #define MEMWRITEOOB             _IOWR('M', 3, struct mtd_oob_buf)
  91 #define MEMREADOOB              _IOWR('M', 4, struct mtd_oob_buf)
  92 #define MEMLOCK                 _IOW('M', 5, struct erase_info_user)
  93 #define MEMUNLOCK               _IOW('M', 6, struct erase_info_user)
  94 #define MEMGETREGIONCOUNT       _IOR('M', 7, int)
  95 #define MEMGETREGIONINFO        _IOWR('M', 8, struct region_info_user)
  96 #define MEMREADDATA             _IOWR('M', 9, struct mtd_oob_buf)
  97 #define MEMWRITEDATA            _IOWR('M', 10, struct mtd_oob_buf)
  98 #define MTDREFRESH                              _IO('M', 23)
  99
 100 #ifndef __KERNEL__
 101
 102 typedef struct mtd_info_user mtd_info_t;
 103 typedef struct erase_info_user erase_info_t;
 104 typedef struct region_info_user region_info_t;
 105
 106         /* User-space ioctl definitions */
 107
 108
 109 #else /* __KERNEL__ */
 110
 111
 112 #define MTD_ERASE_PENDING       0x01
 113 #define MTD_ERASING             0x02
 114 #define MTD_ERASE_SUSPEND       0x04
 115 #define MTD_ERASE_DONE          0x08
 116 #define MTD_ERASE_FAILED        0x10
 117
 118 struct erase_info {
 119         struct mtd_info *mtd;
 120         u_int32_t addr;
 121         u_int32_t len;
 122         u_long time;
 123         u_long retries;
 124         u_int dev;
 125         u_int cell;
 126         void (*callback) (struct erase_info *self);
 127         u_long priv;
 128         u_char state;
 129         struct erase_info *next;
 130 };
 131
 132 struct mtd_erase_region_info {
 133         u_int32_t offset;                       /* At which this region starts, from the beginning of the MTD */
 134         u_int32_t erasesize;            /* For this region */
 135         u_int32_t numblocks;            /* Number of blocks of erasesize in this region */
 136 };
 137
 138 struct mtd_info {
 139         u_char type;
 140         u_int32_t flags;
 141         u_int32_t size;  // Total size of the MTD
 142
 143         /* "Major" erase size for the device. Naïve users may take this
 144          * to be the only erase size available, or may use the more detailed
 145          * information below if they desire
 146          */
 147         u_int32_t erasesize;
 148
 149         u_int32_t oobblock;  // Size of OOB blocks (e.g. 512)
 150         u_int32_t oobsize;   // Amount of OOB data per block (e.g. 16)
 151         u_int32_t ecctype;
 152         u_int32_t eccsize;
 153
 154         // Kernel-only stuff starts here.
 155         char *name;
 156         int index;
 157
 158         /* Data for variable erase regions. If numeraseregions is zero,
 159          * it means that the whole device has erasesize as given above.
 160          */
 161         int numeraseregions;
 162         struct mtd_erase_region_info *eraseregions;
 163
 164         /* This really shouldn't be here. It can go away in 2.5 */
 165         u_int32_t bank_size;
 166
 167         struct module *module;
 168         int (*erase) (struct mtd_info *mtd, struct erase_info *instr);
 169
 170         /* This stuff for eXecute-In-Place */
 171         int (*point) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char **mtdbuf);
 172
 173         /* We probably shouldn't allow XIP if the unpoint isn't a NULL */
 174         void (*unpoint) (struct mtd_info *mtd, u_char * addr, loff_t from, size_t len);
 175
 176
 177         int (*read) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
 178         int (*write) (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf);
 179
 180         int (*read_ecc) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf, u_char *eccbuf, int oobsel);
 181         int (*write_ecc) (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf, u_char *eccbuf, int oobsel);
 182
 183         int (*read_oob) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
 184         int (*write_oob) (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf);
 185
 186         /*
 187          * Methods to access the protection register area, present in some
 188          * flash devices. The user data is one time programmable but the
 189          * factory data is read only.
 190          */
 191         int (*read_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
 192
 193         int (*read_fact_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
 194
 195         /* This function is not yet implemented */
 196         int (*write_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
 197
 198         /* iovec-based read/write methods. We need these especially for NAND flash,
 199            with its limited number of write cycles per erase.
 200            NB: The 'count' parameter is the number of _vectors_, each of
 201            which contains an (ofs, len) tuple.
 202         */
 203         int (*readv) (struct mtd_info *mtd, struct iovec *vecs, unsigned long count, loff_t from, size_t *retlen);
 204         int (*readv_ecc) (struct mtd_info *mtd, struct iovec *vecs, unsigned long count, loff_t from,
 205                 size_t *retlen, u_char *eccbuf, int oobsel);
 206         int (*writev) (struct mtd_info *mtd, const struct iovec *vecs, unsigned long count, loff_t to, size_t *retlen);
 207         int (*writev_ecc) (struct mtd_info *mtd, const struct iovec *vecs, unsigned long count, loff_t to,
 208                 size_t *retlen, u_char *eccbuf, int oobsel);
 209
 210         /* Sync */
 211         void (*sync) (struct mtd_info *mtd);
 212
 213         /* Chip-supported device locking */
 214         int (*lock) (struct mtd_info *mtd, loff_t ofs, size_t len);
 215         int (*unlock) (struct mtd_info *mtd, loff_t ofs, size_t len);
 216
 217         /* Power Management functions */
 218         int (*suspend) (struct mtd_info *mtd);
 219         void (*resume) (struct mtd_info *mtd);
 220
 221         struct notifier_block reboot_notifier;
 222
 223         void *priv;
 224 };
 225
 226
 227         /* Kernel-side ioctl definitions */
 228
 229 extern int add_mtd_device(struct mtd_info *mtd);
 230 extern int del_mtd_device (struct mtd_info *mtd);
 231
 232 extern struct mtd_info *__get_mtd_device(struct mtd_info *mtd, int num);
 233
 234 static inline struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num)
 235 {
 236         struct mtd_info *ret;
 237
 238         ret = __get_mtd_device(mtd, num);
 239
 240         if (ret && ret->module && !try_inc_mod_count(ret->module))
 241                 return NULL;
 242
 243         return ret;
 244 }
 245
 246 static inline void put_mtd_device(struct mtd_info *mtd)
 247 {
 248        if (mtd->module)
 249                __MOD_DEC_USE_COUNT(mtd->module);
 250 }
 251
 252
 253 struct mtd_notifier {
 254         void (*add)(struct mtd_info *mtd);
 255         void (*remove)(struct mtd_info *mtd);
 256         struct mtd_notifier *next;
 257 };
 258
 259
 260 extern void register_mtd_user (struct mtd_notifier *new);
 261 extern int unregister_mtd_user (struct mtd_notifier *old);
 262
 263 int default_mtd_writev(struct mtd_info *mtd, const struct iovec *vecs,
 264                        unsigned long count, loff_t to, size_t *retlen);
 265
 266 int default_mtd_readv(struct mtd_info *mtd, struct iovec *vecs,
 267                       unsigned long count, loff_t from, size_t *retlen);
 268
 269 #ifndef MTDC
 270 #define MTD_ERASE(mtd, args...) (*(mtd->erase))(mtd, args)
 271 #define MTD_POINT(mtd, a,b,c,d) (*(mtd->point))(mtd, a,b,c, (u_char **)(d))
 272 #define MTD_UNPOINT(mtd, arg) (*(mtd->unpoint))(mtd, (u_char *)arg)
 273 #define MTD_READ(mtd, args...) (*(mtd->read))(mtd, args)
 274 #define MTD_WRITE(mtd, args...) (*(mtd->write))(mtd, args)
 275 #define MTD_READV(mtd, args...) (*(mtd->readv))(mtd, args)
 276 #define MTD_WRITEV(mtd, args...) (*(mtd->writev))(mtd, args)
 277 #define MTD_READECC(mtd, args...) (*(mtd->read_ecc))(mtd, args)
 278 #define MTD_WRITEECC(mtd, args...) (*(mtd->write_ecc))(mtd, args)
 279 #define MTD_READOOB(mtd, args...) (*(mtd->read_oob))(mtd, args)
 280 #define MTD_WRITEOOB(mtd, args...) (*(mtd->write_oob))(mtd, args)
 281 #define MTD_SYNC(mtd) do { if (mtd->sync) (*(mtd->sync))(mtd);  } while (0)
 282 #endif /* MTDC */
 283
 284 /*
 285  * Debugging macro and defines
 286  */
 287 #define MTD_DEBUG_LEVEL0        (0)     /* Quiet   */
 288 #define MTD_DEBUG_LEVEL1        (1)     /* Audible */
 289 #define MTD_DEBUG_LEVEL2        (2)     /* Loud    */
 290 #define MTD_DEBUG_LEVEL3        (3)     /* Noisy   */
 291
 292 #ifdef CONFIG_MTD_DEBUG
 293 #define DEBUG(n, args...)                               \
 294         do {                                            \
 295                 if (n <= CONFIG_MTD_DEBUG_VERBOSE)      \
 296                         printk(KERN_INFO args);         \
 297         } while(0)
 298 #else /* CONFIG_MTD_DEBUG */
 299 #define DEBUG(n, args...)
 300 #endif /* CONFIG_MTD_DEBUG */
 301
 302 #endif /* __KERNEL__ */
 303
 304 #endif /* __MTD_MTD_H__ */