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         /*
 137          * Erase is an asynchronous operation.  Device drivers are supposed
 138          * to call instr->callback() whenever the operation completes, even
 139          * if it completes with a failure.
 140          * Callers are supposed to pass a callback function and wait for it
 141          * to be called before writing to the block.
 142          */
 143         int (*erase) (struct mtd_info *mtd, struct erase_info *instr);
 144
 145         /* This stuff for eXecute-In-Place */
 146         int (*point) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char **mtdbuf);
 147
 148         /* We probably shouldn't allow XIP if the unpoint isn't a NULL */
 149         void (*unpoint) (struct mtd_info *mtd, u_char * addr, loff_t from, size_t len);
 150
 151
 152         int (*read) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
 153         int (*write) (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf);
 154
 155         int (*read_oob) (struct mtd_info *mtd, loff_t from,
 156                          struct mtd_oob_ops *ops);
 157         int (*write_oob) (struct mtd_info *mtd, loff_t to,
 158                          struct mtd_oob_ops *ops);
 159
 160         /*
 161          * Methods to access the protection register area, present in some
 162          * flash devices. The user data is one time programmable but the
 163          * factory data is read only.
 164          */
 165         int (*get_fact_prot_info) (struct mtd_info *mtd, struct otp_info *buf, size_t len);
 166         int (*read_fact_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
 167         int (*get_user_prot_info) (struct mtd_info *mtd, struct otp_info *buf, size_t len);
 168         int (*read_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
 169         int (*write_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
 170         int (*lock_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len);
 171
 172         /* kvec-based read/write methods.
 173            NB: The 'count' parameter is the number of _vectors_, each of
 174            which contains an (ofs, len) tuple.
 175         */
 176         int (*writev) (struct mtd_info *mtd, const struct kvec *vecs, unsigned long count, loff_t to, size_t *retlen);
 177
 178         /* Sync */
 179         void (*sync) (struct mtd_info *mtd);
 180
 181         /* Chip-supported device locking */
 182         int (*lock) (struct mtd_info *mtd, loff_t ofs, size_t len);
 183         int (*unlock) (struct mtd_info *mtd, loff_t ofs, size_t len);
 184
 185         /* Power Management functions */
 186         int (*suspend) (struct mtd_info *mtd);
 187         void (*resume) (struct mtd_info *mtd);
 188
 189         /* Bad block management functions */
 190         int (*block_isbad) (struct mtd_info *mtd, loff_t ofs);
 191         int (*block_markbad) (struct mtd_info *mtd, loff_t ofs);
 192
 193         struct notifier_block reboot_notifier;  /* default mode before reboot */
 194
 195         /* ECC status information */
 196         struct mtd_ecc_stats ecc_stats;
 197         /* Subpage shift (NAND) */
 198         int subpage_sft;
 199
 200         void *priv;
 201
 202         struct module *owner;
 203         int usecount;
 204
 205         /* If the driver is something smart, like UBI, it may need to maintain
 206          * its own reference counting. The below functions are only for driver.
 207          * The driver may register its callbacks. These callbacks are not
 208          * supposed to be called by MTD users */
 209         int (*get_device) (struct mtd_info *mtd);
 210         void (*put_device) (struct mtd_info *mtd);
 211 };
 212
 213
 214         /* Kernel-side ioctl definitions */
 215
 216 extern int add_mtd_device(struct mtd_info *mtd);
 217 extern int del_mtd_device (struct mtd_info *mtd);
 218
 219 extern struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num);
 220 extern struct mtd_info *get_mtd_device_nm(const char *name);
 221
 222 extern void put_mtd_device(struct mtd_info *mtd);
 223
 224
 225 struct mtd_notifier {
 226         void (*add)(struct mtd_info *mtd);
 227         void (*remove)(struct mtd_info *mtd);
 228         struct list_head list;
 229 };
 230
 231
 232 extern void register_mtd_user (struct mtd_notifier *new);
 233 extern int unregister_mtd_user (struct mtd_notifier *old);
 234
 235 int default_mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
 236                        unsigned long count, loff_t to, size_t *retlen);
 237
 238 int default_mtd_readv(struct mtd_info *mtd, struct kvec *vecs,
 239                       unsigned long count, loff_t from, size_t *retlen);
 240
 241 #ifdef CONFIG_MTD_PARTITIONS
 242 void mtd_erase_callback(struct erase_info *instr);
 243 #else
 244 static inline void mtd_erase_callback(struct erase_info *instr)
 245 {
 246         if (instr->callback)
 247                 instr->callback(instr);
 248 }
 249 #endif
 250
 251 /*
 252  * Debugging macro and defines
 253  */
 254 #define MTD_DEBUG_LEVEL0        (0)     /* Quiet   */
 255 #define MTD_DEBUG_LEVEL1        (1)     /* Audible */
 256 #define MTD_DEBUG_LEVEL2        (2)     /* Loud    */
 257 #define MTD_DEBUG_LEVEL3        (3)     /* Noisy   */
 258
 259 #ifdef CONFIG_MTD_DEBUG
 260 #define DEBUG(n, args...)                               \
 261         do {                                            \
 262                 if (n <= CONFIG_MTD_DEBUG_VERBOSE)      \
 263                         printk(KERN_INFO args);         \
 264         } while(0)
 265 #else /* CONFIG_MTD_DEBUG */
 266 #define DEBUG(n, args...) do { } while(0)
 267
 268 #endif /* CONFIG_MTD_DEBUG */
 269
 270 #endif /* __MTD_MTD_H__ */