include/linux/mtd/mtd.h

   1 /*
   2  * Copyright (C) 1999-2003 David Woodhouse <dwmw2@infradead.org> et al.
   3  *
   4  * Released under GPL
   5  */
   6
   7 #ifndef __MTD_MTD_H__
   8 #define __MTD_MTD_H__
   9
  10 #include <linux/types.h>
  11 #include <div64.h>
  12 #include <linux/mtd/mtd-abi.h>
  13
  14 #define MTD_CHAR_MAJOR 90
  15 #define MTD_BLOCK_MAJOR 31
  16 #define MAX_MTD_DEVICES 32
  17
  18 #define MTD_ERASE_PENDING       0x01
  19 #define MTD_ERASING             0x02
  20 #define MTD_ERASE_SUSPEND       0x04
  21 #define MTD_ERASE_DONE          0x08
  22 #define MTD_ERASE_FAILED        0x10
  23
  24 #define MTD_FAIL_ADDR_UNKNOWN   -1LL
  25
  26 /*
  27  * Enumeration for NAND/OneNAND flash chip state
  28  */
  29 enum {
  30         FL_READY,
  31         FL_READING,
  32         FL_WRITING,
  33         FL_ERASING,
  34         FL_SYNCING,
  35         FL_CACHEDPRG,
  36         FL_RESETING,
  37         FL_UNLOCKING,
  38         FL_LOCKING,
  39         FL_PM_SUSPENDED,
  40 };
  41
  42 /* If the erase fails, fail_addr might indicate exactly which block failed.  If
  43    fail_addr = MTD_FAIL_ADDR_UNKNOWN, the failure was not at the device level or was not
  44    specific to any particular block. */
  45 struct erase_info {
  46         struct mtd_info *mtd;
  47         uint64_t addr;
  48         uint64_t len;
  49         uint64_t fail_addr;
  50         u_long time;
  51         u_long retries;
  52         u_int dev;
  53         u_int cell;
  54         void (*callback) (struct erase_info *self);
  55         u_long priv;
  56         u_char state;
  57         struct erase_info *next;
  58 };
  59
  60 struct mtd_erase_region_info {
  61         uint64_t offset;                        /* At which this region starts, from the beginning of the MTD */
  62         u_int32_t erasesize;            /* For this region */
  63         u_int32_t numblocks;            /* Number of blocks of erasesize in this region */
  64         unsigned long *lockmap;         /* If keeping bitmap of locks */
  65 };
  66
  67 /*
  68  * oob operation modes
  69  *
  70  * MTD_OOB_PLACE:       oob data are placed at the given offset
  71  * MTD_OOB_AUTO:        oob data are automatically placed at the free areas
  72  *                      which are defined by the ecclayout
  73  * MTD_OOB_RAW:         mode to read raw data+oob in one chunk. The oob data
  74  *                      is inserted into the data. Thats a raw image of the
  75  *                      flash contents.
  76  */
  77 typedef enum {
  78         MTD_OOB_PLACE,
  79         MTD_OOB_AUTO,
  80         MTD_OOB_RAW,
  81 } mtd_oob_mode_t;
  82
  83 /**
  84  * struct mtd_oob_ops - oob operation operands
  85  * @mode:       operation mode
  86  *
  87  * @len:        number of data bytes to write/read
  88  *
  89  * @retlen:     number of data bytes written/read
  90  *
  91  * @ooblen:     number of oob bytes to write/read
  92  * @oobretlen:  number of oob bytes written/read
  93  * @ooboffs:    offset of oob data in the oob area (only relevant when
  94  *              mode = MTD_OOB_PLACE)
  95  * @datbuf:     data buffer - if NULL only oob data are read/written
  96  * @oobbuf:     oob data buffer
  97  *
  98  * Note, it is allowed to read more then one OOB area at one go, but not write.
  99  * The interface assumes that the OOB write requests program only one page's
 100  * OOB area.
 101  */
 102 struct mtd_oob_ops {
 103         mtd_oob_mode_t  mode;
 104         size_t          len;
 105         size_t          retlen;
 106         size_t          ooblen;
 107         size_t          oobretlen;
 108         uint32_t        ooboffs;
 109         uint8_t         *datbuf;
 110         uint8_t         *oobbuf;
 111 };
 112
 113 struct mtd_info {
 114         u_char type;
 115         u_int32_t flags;
 116         uint64_t size;   /* Total size of the MTD */
 117
 118         /* "Major" erase size for the device. Naïve users may take this
 119          * to be the only erase size available, or may use the more detailed
 120          * information below if they desire
 121          */
 122         u_int32_t erasesize;
 123         /* Minimal writable flash unit size. In case of NOR flash it is 1 (even
 124          * though individual bits can be cleared), in case of NAND flash it is
 125          * one NAND page (or half, or one-fourths of it), in case of ECC-ed NOR
 126          * it is of ECC block size, etc. It is illegal to have writesize = 0.
 127          * Any driver registering a struct mtd_info must ensure a writesize of
 128          * 1 or larger.
 129          */
 130         u_int32_t writesize;
 131
 132         u_int32_t oobsize;   /* Amount of OOB data per block (e.g. 16) */
 133         u_int32_t oobavail;  /* Available OOB bytes per block */
 134
 135         /* Kernel-only stuff starts here. */
 136         const char *name;
 137         int index;
 138
 139         /* ecc layout structure pointer - read only ! */
 140         struct nand_ecclayout *ecclayout;
 141
 142         /* Data for variable erase regions. If numeraseregions is zero,
 143          * it means that the whole device has erasesize as given above.
 144          */
 145         int numeraseregions;
 146         struct mtd_erase_region_info *eraseregions;
 147
 148         /*
 149          * Erase is an asynchronous operation.  Device drivers are supposed
 150          * to call instr->callback() whenever the operation completes, even
 151          * if it completes with a failure.
 152          * Callers are supposed to pass a callback function and wait for it
 153          * to be called before writing to the block.
 154          */
 155         int (*erase) (struct mtd_info *mtd, struct erase_info *instr);
 156
 157         /* This stuff for eXecute-In-Place */
 158         /* phys is optional and may be set to NULL */
 159         int (*point) (struct mtd_info *mtd, loff_t from, size_t len,
 160                         size_t *retlen, void **virt, phys_addr_t *phys);
 161
 162         /* We probably shouldn't allow XIP if the unpoint isn't a NULL */
 163         void (*unpoint) (struct mtd_info *mtd, loff_t from, size_t len);
 164
 165
 166         int (*read) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
 167         int (*write) (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf);
 168
 169         /* In blackbox flight recorder like scenarios we want to make successful
 170            writes in interrupt context. panic_write() is only intended to be
 171            called when its known the kernel is about to panic and we need the
 172            write to succeed. Since the kernel is not going to be running for much
 173            longer, this function can break locks and delay to ensure the write
 174            succeeds (but not sleep). */
 175
 176         int (*panic_write) (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf);
 177
 178         int (*read_oob) (struct mtd_info *mtd, loff_t from,
 179                          struct mtd_oob_ops *ops);
 180         int (*write_oob) (struct mtd_info *mtd, loff_t to,
 181                          struct mtd_oob_ops *ops);
 182
 183         /*
 184          * Methods to access the protection register area, present in some
 185          * flash devices. The user data is one time programmable but the
 186          * factory data is read only.
 187          */
 188         int (*get_fact_prot_info) (struct mtd_info *mtd, struct otp_info *buf, size_t len);
 189         int (*read_fact_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
 190         int (*get_user_prot_info) (struct mtd_info *mtd, struct otp_info *buf, size_t len);
 191         int (*read_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
 192         int (*write_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
 193         int (*lock_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len);
 194
 195 /* XXX U-BOOT XXX */
 196 #if 0
 197         /* kvec-based read/write methods.
 198            NB: The 'count' parameter is the number of _vectors_, each of
 199            which contains an (ofs, len) tuple.
 200         */
 201         int (*writev) (struct mtd_info *mtd, const struct kvec *vecs, unsigned long count, loff_t to, size_t *retlen);
 202 #endif
 203
 204         /* Sync */
 205         void (*sync) (struct mtd_info *mtd);
 206
 207         /* Chip-supported device locking */
 208         int (*lock) (struct mtd_info *mtd, loff_t ofs, uint64_t len);
 209         int (*unlock) (struct mtd_info *mtd, loff_t ofs, uint64_t len);
 210
 211         /* Bad block management functions */
 212         int (*block_isbad) (struct mtd_info *mtd, loff_t ofs);
 213         int (*block_markbad) (struct mtd_info *mtd, loff_t ofs);
 214
 215 /* XXX U-BOOT XXX */
 216 #if 0
 217         struct notifier_block reboot_notifier;  /* default mode before reboot */
 218 #endif
 219
 220         /* ECC status information */
 221         struct mtd_ecc_stats ecc_stats;
 222         /* Subpage shift (NAND) */
 223         int subpage_sft;
 224
 225         void *priv;
 226
 227         struct module *owner;
 228         int usecount;
 229
 230         /* If the driver is something smart, like UBI, it may need to maintain
 231          * its own reference counting. The below functions are only for driver.
 232          * The driver may register its callbacks. These callbacks are not
 233          * supposed to be called by MTD users */
 234         int (*get_device) (struct mtd_info *mtd);
 235         void (*put_device) (struct mtd_info *mtd);
 236 };
 237
 238 static inline uint32_t mtd_div_by_eb(uint64_t sz, struct mtd_info *mtd)
 239 {
 240         do_div(sz, mtd->erasesize);
 241         return sz;
 242 }
 243
 244 static inline uint32_t mtd_mod_by_eb(uint64_t sz, struct mtd_info *mtd)
 245 {
 246         return do_div(sz, mtd->erasesize);
 247 }
 248
 249         /* Kernel-side ioctl definitions */
 250
 251 extern int add_mtd_device(struct mtd_info *mtd);
 252 extern int del_mtd_device (struct mtd_info *mtd);
 253
 254 extern struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num);
 255 extern struct mtd_info *get_mtd_device_nm(const char *name);
 256
 257 extern void put_mtd_device(struct mtd_info *mtd);
 258
 259 /* XXX U-BOOT XXX */
 260 #if 0
 261 struct mtd_notifier {
 262         void (*add)(struct mtd_info *mtd);
 263         void (*remove)(struct mtd_info *mtd);
 264         struct list_head list;
 265 };
 266
 267 extern void register_mtd_user (struct mtd_notifier *new);
 268 extern int unregister_mtd_user (struct mtd_notifier *old);
 269
 270 int default_mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
 271                        unsigned long count, loff_t to, size_t *retlen);
 272
 273 int default_mtd_readv(struct mtd_info *mtd, struct kvec *vecs,
 274                       unsigned long count, loff_t from, size_t *retlen);
 275 #endif
 276
 277 #ifdef CONFIG_MTD_PARTITIONS
 278 void mtd_erase_callback(struct erase_info *instr);
 279 #else
 280 static inline void mtd_erase_callback(struct erase_info *instr)
 281 {
 282         if (instr->callback)
 283                 instr->callback(instr);
 284 }
 285 #endif
 286
 287 /*
 288  * Debugging macro and defines
 289  */
 290 #define MTD_DEBUG_LEVEL0        (0)     /* Quiet   */
 291 #define MTD_DEBUG_LEVEL1        (1)     /* Audible */
 292 #define MTD_DEBUG_LEVEL2        (2)     /* Loud    */
 293 #define MTD_DEBUG_LEVEL3        (3)     /* Noisy   */
 294
 295 #ifdef CONFIG_MTD_DEBUG
 296 #define MTDDEBUG(n, args...)                            \
 297         do {                                            \
 298                 if (n <= CONFIG_MTD_DEBUG_VERBOSE)      \
 299                         printk(KERN_INFO args);         \
 300         } while(0)
 301 #else /* CONFIG_MTD_DEBUG */
 302 #define MTDDEBUG(n, args...)                            \
 303         do {                                            \
 304                 if (0)                                  \
 305                         printk(KERN_INFO args);         \
 306         } while(0)
 307 #endif /* CONFIG_MTD_DEBUG */
 308
 309 #endif /* __MTD_MTD_H__ */