include/linux/mtd/mtd.h

   1 /*
   2  * $Id: mtd.h,v 1.61 2005/11/07 11:14:54 gleixner Exp $
   3  *
   4  * Copyright (C) 1999-2003 David Woodhouse <dwmw2@infradead.org> et al.
   5  *
   6  * Released under GPL
   7  */
   8
   9 #ifndef __MTD_MTD_H__
  10 #define __MTD_MTD_H__
  11
  12 #include <linux/types.h>
  13 #include <linux/module.h>
  14 #include <linux/uio.h>
  15 #include <linux/notifier.h>
  16
  17 #include <linux/mtd/compatmac.h>
  18 #include <mtd/mtd-abi.h>
  19
  20 #define MTD_CHAR_MAJOR 90
  21 #define MTD_BLOCK_MAJOR 31
  22 #define MAX_MTD_DEVICES 32
  23
  24 #define MTD_ERASE_PENDING       0x01
  25 #define MTD_ERASING             0x02
  26 #define MTD_ERASE_SUSPEND       0x04
  27 #define MTD_ERASE_DONE          0x08
  28 #define MTD_ERASE_FAILED        0x10
  29
  30 /* If the erase fails, fail_addr might indicate exactly which block failed.  If
  31    fail_addr = 0xffffffff, the failure was not at the device level or was not
  32    specific to any particular block. */
  33 struct erase_info {
  34         struct mtd_info *mtd;
  35         u_int32_t addr;
  36         u_int32_t len;
  37         u_int32_t fail_addr;
  38         u_long time;
  39         u_long retries;
  40         u_int dev;
  41         u_int cell;
  42         void (*callback) (struct erase_info *self);
  43         u_long priv;
  44         u_char state;
  45         struct erase_info *next;
  46 };
  47
  48 struct mtd_erase_region_info {
  49         u_int32_t offset;                       /* At which this region starts, from the beginning of the MTD */
  50         u_int32_t erasesize;            /* For this region */
  51         u_int32_t numblocks;            /* Number of blocks of erasesize in this region */
  52         unsigned long *lockmap;         /* If keeping bitmap of locks */
  53 };
  54
  55 /*
  56  * oob operation modes
  57  *
  58  * MTD_OOB_PLACE:       oob data are placed at the given offset
  59  * MTD_OOB_AUTO:        oob data are automatically placed at the free areas
  60  *                      which are defined by the ecclayout
  61  * MTD_OOB_RAW:         mode to read raw data+oob in one chunk. The oob data
  62  *                      is inserted into the data. Thats a raw image of the
  63  *                      flash contents.
  64  */
  65 typedef enum {
  66         MTD_OOB_PLACE,
  67         MTD_OOB_AUTO,
  68         MTD_OOB_RAW,
  69 } mtd_oob_mode_t;
  70
  71 /**
  72  * struct mtd_oob_ops - oob operation operands
  73  * @mode:       operation mode
  74  *
  75  * @len:        number of data bytes to write/read
  76  *
  77  * @retlen:     number of data bytes written/read
  78  *
  79  * @ooblen:     number of oob bytes to write/read
  80  * @oobretlen:  number of oob bytes written/read
  81  * @ooboffs:    offset of oob data in the oob area (only relevant when
  82  *              mode = MTD_OOB_PLACE)
  83  * @datbuf:     data buffer - if NULL only oob data are read/written
  84  * @oobbuf:     oob data buffer
  85  *
  86  * Note, it is allowed to read more then one OOB area at one go, but not write.
  87  * The interface assumes that the OOB write requests program only one page's
  88  * OOB area.
  89  */
  90 struct mtd_oob_ops {
  91         mtd_oob_mode_t  mode;
  92         size_t          len;
  93         size_t          retlen;
  94         size_t          ooblen;
  95         size_t          oobretlen;
  96         uint32_t        ooboffs;
  97         uint8_t         *datbuf;
  98         uint8_t         *oobbuf;
  99 };
 100
 101 struct mtd_info {
 102         u_char type;
 103         u_int32_t flags;
 104         u_int32_t size;  // Total size of the MTD
 105
 106         /* "Major" erase size for the device. Naïve users may take this
 107          * to be the only erase size available, or may use the more detailed
 108          * information below if they desire
 109          */
 110         u_int32_t erasesize;
 111         /* Minimal writable flash unit size. In case of NOR flash it is 1 (even
 112          * though individual bits can be cleared), in case of NAND flash it is
 113          * one NAND page (or half, or one-fourths of it), in case of ECC-ed NOR
 114          * it is of ECC block size, etc. It is illegal to have writesize = 0.
 115          * Any driver registering a struct mtd_info must ensure a writesize of
 116          * 1 or larger.
 117          */
 118         u_int32_t writesize;
 119
 120         u_int32_t oobsize;   // Amount of OOB data per block (e.g. 16)
 121         u_int32_t oobavail;  // Available OOB bytes per block
 122
 123         // Kernel-only stuff starts here.
 124         char *name;
 125         int index;
 126
 127         /* ecc layout structure pointer - read only ! */
 128         struct nand_ecclayout *ecclayout;
 129
 130         /* Data for variable erase regions. If numeraseregions is zero,
 131          * it means that the whole device has erasesize as given above.
 132          */
 133         int numeraseregions;
 134         struct mtd_erase_region_info *eraseregions;
 135
 136         int (*erase) (struct mtd_info *mtd, struct erase_info *instr);
 137
 138         /* This stuff for eXecute-In-Place */
 139         int (*point) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char **mtdbuf);
 140
 141         /* We probably shouldn't allow XIP if the unpoint isn't a NULL */
 142         void (*unpoint) (struct mtd_info *mtd, u_char * addr, loff_t from, size_t len);
 143
 144
 145         int (*read) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
 146         int (*write) (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf);
 147
 148         int (*read_oob) (struct mtd_info *mtd, loff_t from,
 149                          struct mtd_oob_ops *ops);
 150         int (*write_oob) (struct mtd_info *mtd, loff_t to,
 151                          struct mtd_oob_ops *ops);
 152
 153         /*
 154          * Methods to access the protection register area, present in some
 155          * flash devices. The user data is one time programmable but the
 156          * factory data is read only.
 157          */
 158         int (*get_fact_prot_info) (struct mtd_info *mtd, struct otp_info *buf, size_t len);
 159         int (*read_fact_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
 160         int (*get_user_prot_info) (struct mtd_info *mtd, struct otp_info *buf, size_t len);
 161         int (*read_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
 162         int (*write_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
 163         int (*lock_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len);
 164
 165         /* kvec-based read/write methods.
 166            NB: The 'count' parameter is the number of _vectors_, each of
 167            which contains an (ofs, len) tuple.
 168         */
 169         int (*writev) (struct mtd_info *mtd, const struct kvec *vecs, unsigned long count, loff_t to, size_t *retlen);
 170
 171         /* Sync */
 172         void (*sync) (struct mtd_info *mtd);
 173
 174         /* Chip-supported device locking */
 175         int (*lock) (struct mtd_info *mtd, loff_t ofs, size_t len);
 176         int (*unlock) (struct mtd_info *mtd, loff_t ofs, size_t len);
 177
 178         /* Power Management functions */
 179         int (*suspend) (struct mtd_info *mtd);
 180         void (*resume) (struct mtd_info *mtd);
 181
 182         /* Bad block management functions */
 183         int (*block_isbad) (struct mtd_info *mtd, loff_t ofs);
 184         int (*block_markbad) (struct mtd_info *mtd, loff_t ofs);
 185
 186         struct notifier_block reboot_notifier;  /* default mode before reboot */
 187
 188         /* ECC status information */
 189         struct mtd_ecc_stats ecc_stats;
 190         /* Subpage shift (NAND) */
 191         int subpage_sft;
 192
 193         void *priv;
 194
 195         struct module *owner;
 196         int usecount;
 197
 198         /* If the driver is something smart, like UBI, it may need to maintain
 199          * its own reference counting. The below functions are only for driver.
 200          * The driver may register its callbacks. These callbacks are not
 201          * supposed to be called by MTD users */
 202         int (*get_device) (struct mtd_info *mtd);
 203         void (*put_device) (struct mtd_info *mtd);
 204 };
 205
 206
 207         /* Kernel-side ioctl definitions */
 208
 209 extern int add_mtd_device(struct mtd_info *mtd);
 210 extern int del_mtd_device (struct mtd_info *mtd);
 211
 212 extern struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num);
 213 extern struct mtd_info *get_mtd_device_nm(const char *name);
 214
 215 extern void put_mtd_device(struct mtd_info *mtd);
 216
 217
 218 struct mtd_notifier {
 219         void (*add)(struct mtd_info *mtd);
 220         void (*remove)(struct mtd_info *mtd);
 221         struct list_head list;
 222 };
 223
 224
 225 extern void register_mtd_user (struct mtd_notifier *new);
 226 extern int unregister_mtd_user (struct mtd_notifier *old);
 227
 228 int default_mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
 229                        unsigned long count, loff_t to, size_t *retlen);
 230
 231 int default_mtd_readv(struct mtd_info *mtd, struct kvec *vecs,
 232                       unsigned long count, loff_t from, size_t *retlen);
 233
 234 #ifdef CONFIG_MTD_PARTITIONS
 235 void mtd_erase_callback(struct erase_info *instr);
 236 #else
 237 static inline void mtd_erase_callback(struct erase_info *instr)
 238 {
 239         if (instr->callback)
 240                 instr->callback(instr);
 241 }
 242 #endif
 243
 244 /*
 245  * Debugging macro and defines
 246  */
 247 #define MTD_DEBUG_LEVEL0        (0)     /* Quiet   */
 248 #define MTD_DEBUG_LEVEL1        (1)     /* Audible */
 249 #define MTD_DEBUG_LEVEL2        (2)     /* Loud    */
 250 #define MTD_DEBUG_LEVEL3        (3)     /* Noisy   */
 251
 252 #ifdef CONFIG_MTD_DEBUG
 253 #define DEBUG(n, args...)                               \
 254         do {                                            \
 255                 if (n <= CONFIG_MTD_DEBUG_VERBOSE)      \
 256                         printk(KERN_INFO args);         \
 257         } while(0)
 258 #else /* CONFIG_MTD_DEBUG */
 259 #define DEBUG(n, args...) do { } while(0)
 260
 261 #endif /* CONFIG_MTD_DEBUG */
 262
 263 #endif /* __MTD_MTD_H__ */