package/mtd/src/mtd-api.h

   1
   2 /* $Id: mtd.h,v 1.38 2003/01/12 16:30:19 spse Exp $ */
   3
   4 #ifndef __MTD_MTD_H__
   5 #define __MTD_MTD_H__
   6
   7 #ifdef __KERNEL__
   8
   9 #include <linux/config.h>
  10 #include <linux/version.h>
  11 #include <linux/types.h>
  12 #include <linux/mtd/compatmac.h>
  13 #include <linux/notifier.h>
  14 #include <linux/module.h>
  15 #include <linux/uio.h>
  16
  17 #endif /* __KERNEL__ */
  18
  19 struct erase_info_user {
  20         u_int32_t start;
  21         u_int32_t length;
  22 };
  23
  24 struct mtd_oob_buf {
  25         u_int32_t start;
  26         u_int32_t length;
  27         unsigned char *ptr;
  28 };
  29
  30
  31 #define MTD_CHAR_MAJOR 90
  32 #define MTD_BLOCK_MAJOR 31
  33 #define MAX_MTD_DEVICES 16
  34
  35
  36
  37 #define MTD_ABSENT              0
  38 #define MTD_RAM                 1
  39 #define MTD_ROM                 2
  40 #define MTD_NORFLASH            3
  41 #define MTD_NANDFLASH           4
  42 #define MTD_PEROM               5
  43 #define MTD_OTHER               14
  44 #define MTD_UNKNOWN             15
  45
  46
  47
  48 #define MTD_CLEAR_BITS          1       // Bits can be cleared (flash)
  49 #define MTD_SET_BITS            2       // Bits can be set
  50 #define MTD_ERASEABLE           4       // Has an erase function
  51 #define MTD_WRITEB_WRITEABLE    8       // Direct IO is possible
  52 #define MTD_VOLATILE            16      // Set for RAMs
  53 #define MTD_XIP                 32      // eXecute-In-Place possible
  54 #define MTD_OOB                 64      // Out-of-band data (NAND flash)
  55 #define MTD_ECC                 128     // Device capable of automatic ECC
  56
  57 // Some common devices / combinations of capabilities
  58 #define MTD_CAP_ROM             0
  59 #define MTD_CAP_RAM             (MTD_CLEAR_BITS|MTD_SET_BITS|MTD_WRITEB_WRITEABLE)
  60 #define MTD_CAP_NORFLASH        (MTD_CLEAR_BITS|MTD_ERASEABLE)
  61 #define MTD_CAP_NANDFLASH       (MTD_CLEAR_BITS|MTD_ERASEABLE|MTD_OOB)
  62 #define MTD_WRITEABLE           (MTD_CLEAR_BITS|MTD_SET_BITS)
  63
  64
  65 // Types of automatic ECC/Checksum available
  66 #define MTD_ECC_NONE            0       // No automatic ECC available
  67 #define MTD_ECC_RS_DiskOnChip   1       // Automatic ECC on DiskOnChip
  68 #define MTD_ECC_SW              2       // SW ECC for Toshiba & Samsung devices
  69
  70 struct mtd_info_user {
  71         u_char type;
  72         u_int32_t flags;
  73         u_int32_t size;  // Total size of the MTD
  74         u_int32_t erasesize;
  75         u_int32_t oobblock;  // Size of OOB blocks (e.g. 512)
  76         u_int32_t oobsize;   // Amount of OOB data per block (e.g. 16)
  77         u_int32_t ecctype;
  78         u_int32_t eccsize;
  79 };
  80
  81 struct region_info_user {
  82         u_int32_t offset;               /* At which this region starts,
  83                                          * from the beginning of the MTD */
  84         u_int32_t erasesize;            /* For this region */
  85         u_int32_t numblocks;            /* Number of blocks in this region */
  86         u_int32_t regionindex;
  87 };
  88
  89 #define MEMGETINFO              _IOR('M', 1, struct mtd_info_user)
  90 #define MEMERASE                _IOW('M', 2, struct erase_info_user)
  91 #define MEMWRITEOOB             _IOWR('M', 3, struct mtd_oob_buf)
  92 #define MEMREADOOB              _IOWR('M', 4, struct mtd_oob_buf)
  93 #define MEMLOCK                 _IOW('M', 5, struct erase_info_user)
  94 #define MEMUNLOCK               _IOW('M', 6, struct erase_info_user)
  95 #define MEMGETREGIONCOUNT       _IOR('M', 7, int)
  96 #define MEMGETREGIONINFO        _IOWR('M', 8, struct region_info_user)
  97 #define MEMREADDATA             _IOWR('M', 9, struct mtd_oob_buf)
  98 #define MEMWRITEDATA            _IOWR('M', 10, struct mtd_oob_buf)
  99 #define MTDREFRESH                              _IO('M', 23)
 100
 101 #ifndef __KERNEL__
 102
 103 typedef struct mtd_info_user mtd_info_t;
 104 typedef struct erase_info_user erase_info_t;
 105 typedef struct region_info_user region_info_t;
 106
 107         /* User-space ioctl definitions */
 108
 109
 110 #else /* __KERNEL__ */
 111
 112
 113 #define MTD_ERASE_PENDING       0x01
 114 #define MTD_ERASING             0x02
 115 #define MTD_ERASE_SUSPEND       0x04
 116 #define MTD_ERASE_DONE          0x08
 117 #define MTD_ERASE_FAILED        0x10
 118
 119 struct erase_info {
 120         struct mtd_info *mtd;
 121         u_int32_t addr;
 122         u_int32_t len;
 123         u_long time;
 124         u_long retries;
 125         u_int dev;
 126         u_int cell;
 127         void (*callback) (struct erase_info *self);
 128         u_long priv;
 129         u_char state;
 130         struct erase_info *next;
 131 };
 132
 133 struct mtd_erase_region_info {
 134         u_int32_t offset;                       /* At which this region starts, from the beginning of the MTD */
 135         u_int32_t erasesize;            /* For this region */
 136         u_int32_t numblocks;            /* Number of blocks of erasesize in this region */
 137 };
 138
 139 struct mtd_info {
 140         u_char type;
 141         u_int32_t flags;
 142         u_int32_t size;  // Total size of the MTD
 143
 144         /* "Major" erase size for the device. Naïve users may take this
 145          * to be the only erase size available, or may use the more detailed
 146          * information below if they desire
 147          */
 148         u_int32_t erasesize;
 149
 150         u_int32_t oobblock;  // Size of OOB blocks (e.g. 512)
 151         u_int32_t oobsize;   // Amount of OOB data per block (e.g. 16)
 152         u_int32_t ecctype;
 153         u_int32_t eccsize;
 154
 155         // Kernel-only stuff starts here.
 156         char *name;
 157         int index;
 158
 159         /* Data for variable erase regions. If numeraseregions is zero,
 160          * it means that the whole device has erasesize as given above.
 161          */
 162         int numeraseregions;
 163         struct mtd_erase_region_info *eraseregions;
 164
 165         /* This really shouldn't be here. It can go away in 2.5 */
 166         u_int32_t bank_size;
 167
 168         struct module *module;
 169         int (*erase) (struct mtd_info *mtd, struct erase_info *instr);
 170
 171         /* This stuff for eXecute-In-Place */
 172         int (*point) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char **mtdbuf);
 173
 174         /* We probably shouldn't allow XIP if the unpoint isn't a NULL */
 175         void (*unpoint) (struct mtd_info *mtd, u_char * addr, loff_t from, size_t len);
 176
 177
 178         int (*read) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
 179         int (*write) (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf);
 180
 181         int (*read_ecc) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf, u_char *eccbuf, int oobsel);
 182         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);
 183
 184         int (*read_oob) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
 185         int (*write_oob) (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf);
 186
 187         /*
 188          * Methods to access the protection register area, present in some
 189          * flash devices. The user data is one time programmable but the
 190          * factory data is read only.
 191          */
 192         int (*read_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
 193
 194         int (*read_fact_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
 195
 196         /* This function is not yet implemented */
 197         int (*write_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
 198
 199         /* iovec-based read/write methods. We need these especially for NAND flash,
 200            with its limited number of write cycles per erase.
 201            NB: The 'count' parameter is the number of _vectors_, each of
 202            which contains an (ofs, len) tuple.
 203         */
 204         int (*readv) (struct mtd_info *mtd, struct iovec *vecs, unsigned long count, loff_t from, size_t *retlen);
 205         int (*readv_ecc) (struct mtd_info *mtd, struct iovec *vecs, unsigned long count, loff_t from,
 206                 size_t *retlen, u_char *eccbuf, int oobsel);
 207         int (*writev) (struct mtd_info *mtd, const struct iovec *vecs, unsigned long count, loff_t to, size_t *retlen);
 208         int (*writev_ecc) (struct mtd_info *mtd, const struct iovec *vecs, unsigned long count, loff_t to,
 209                 size_t *retlen, u_char *eccbuf, int oobsel);
 210
 211         /* Sync */
 212         void (*sync) (struct mtd_info *mtd);
 213
 214         /* Chip-supported device locking */
 215         int (*lock) (struct mtd_info *mtd, loff_t ofs, size_t len);
 216         int (*unlock) (struct mtd_info *mtd, loff_t ofs, size_t len);
 217
 218         /* Power Management functions */
 219         int (*suspend) (struct mtd_info *mtd);
 220         void (*resume) (struct mtd_info *mtd);
 221
 222         struct notifier_block reboot_notifier;
 223
 224         void *priv;
 225 };
 226
 227
 228         /* Kernel-side ioctl definitions */
 229
 230 extern int add_mtd_device(struct mtd_info *mtd);
 231 extern int del_mtd_device (struct mtd_info *mtd);
 232
 233 extern struct mtd_info *__get_mtd_device(struct mtd_info *mtd, int num);
 234
 235 static inline struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num)
 236 {
 237         struct mtd_info *ret;
 238
 239         ret = __get_mtd_device(mtd, num);
 240
 241         if (ret && ret->module && !try_inc_mod_count(ret->module))
 242                 return NULL;
 243
 244         return ret;
 245 }
 246
 247 static inline void put_mtd_device(struct mtd_info *mtd)
 248 {
 249        if (mtd->module)
 250                __MOD_DEC_USE_COUNT(mtd->module);
 251 }
 252
 253
 254 struct mtd_notifier {
 255         void (*add)(struct mtd_info *mtd);
 256         void (*remove)(struct mtd_info *mtd);
 257         struct mtd_notifier *next;
 258 };
 259
 260
 261 extern void register_mtd_user (struct mtd_notifier *new);
 262 extern int unregister_mtd_user (struct mtd_notifier *old);
 263
 264 int default_mtd_writev(struct mtd_info *mtd, const struct iovec *vecs,
 265                        unsigned long count, loff_t to, size_t *retlen);
 266
 267 int default_mtd_readv(struct mtd_info *mtd, struct iovec *vecs,
 268                       unsigned long count, loff_t from, size_t *retlen);
 269
 270 #ifndef MTDC
 271 #define MTD_ERASE(mtd, args...) (*(mtd->erase))(mtd, args)
 272 #define MTD_POINT(mtd, a,b,c,d) (*(mtd->point))(mtd, a,b,c, (u_char **)(d))
 273 #define MTD_UNPOINT(mtd, arg) (*(mtd->unpoint))(mtd, (u_char *)arg)
 274 #define MTD_READ(mtd, args...) (*(mtd->read))(mtd, args)
 275 #define MTD_WRITE(mtd, args...) (*(mtd->write))(mtd, args)
 276 #define MTD_READV(mtd, args...) (*(mtd->readv))(mtd, args)
 277 #define MTD_WRITEV(mtd, args...) (*(mtd->writev))(mtd, args)
 278 #define MTD_READECC(mtd, args...) (*(mtd->read_ecc))(mtd, args)
 279 #define MTD_WRITEECC(mtd, args...) (*(mtd->write_ecc))(mtd, args)
 280 #define MTD_READOOB(mtd, args...) (*(mtd->read_oob))(mtd, args)
 281 #define MTD_WRITEOOB(mtd, args...) (*(mtd->write_oob))(mtd, args)
 282 #define MTD_SYNC(mtd) do { if (mtd->sync) (*(mtd->sync))(mtd);  } while (0)
 283 #endif /* MTDC */
 284
 285 /*
 286  * Debugging macro and defines
 287  */
 288 #define MTD_DEBUG_LEVEL0        (0)     /* Quiet   */
 289 #define MTD_DEBUG_LEVEL1        (1)     /* Audible */
 290 #define MTD_DEBUG_LEVEL2        (2)     /* Loud    */
 291 #define MTD_DEBUG_LEVEL3        (3)     /* Noisy   */
 292
 293 #ifdef CONFIG_MTD_DEBUG
 294 #define DEBUG(n, args...)                               \
 295         do {                                            \
 296                 if (n <= CONFIG_MTD_DEBUG_VERBOSE)      \
 297                         printk(KERN_INFO args);         \
 298         } while(0)
 299 #else /* CONFIG_MTD_DEBUG */
 300 #define DEBUG(n, args...)
 301 #endif /* CONFIG_MTD_DEBUG */
 302
 303 #endif /* __KERNEL__ */
 304
 305 #endif /* __MTD_MTD_H__ */