2 * $Id: mtd.h,v 1.61 2005/11/07 11:14:54 gleixner Exp $
4 * Copyright (C) 1999-2003 David Woodhouse <dwmw2@infradead.org> et al.
13 #error This is a kernel header. Perhaps include mtd-user.h instead?
16 #include <linux/types.h>
17 #include <linux/module.h>
18 #include <linux/uio.h>
19 #include <linux/notifier.h>
21 #include <linux/mtd/compatmac.h>
22 #include <mtd/mtd-abi.h>
24 #define MTD_CHAR_MAJOR 90
25 #define MTD_BLOCK_MAJOR 31
26 #define MAX_MTD_DEVICES 32
28 #define MTD_ERASE_PENDING 0x01
29 #define MTD_ERASING 0x02
30 #define MTD_ERASE_SUSPEND 0x04
31 #define MTD_ERASE_DONE 0x08
32 #define MTD_ERASE_FAILED 0x10
34 /* If the erase fails, fail_addr might indicate exactly which block failed. If
35 fail_addr = 0xffffffff, the failure was not at the device level or was not
36 specific to any particular block. */
46 void (*callback) (struct erase_info *self);
49 struct erase_info *next;
52 struct mtd_erase_region_info {
53 u_int32_t offset; /* At which this region starts, from the beginning of the MTD */
54 u_int32_t erasesize; /* For this region */
55 u_int32_t numblocks; /* Number of blocks of erasesize in this region */
61 * MTD_OOB_PLACE: oob data are placed at the given offset
62 * MTD_OOB_AUTO: oob data are automatically placed at the free areas
63 * which are defined by the ecclayout
64 * MTD_OOB_RAW: mode to read raw data+oob in one chunk. The oob data
65 * is inserted into the data. Thats a raw image of the
75 * struct mtd_oob_ops - oob operation operands
76 * @mode: operation mode
78 * @len: number of data bytes to write/read
80 * @retlen: number of data bytes written/read
82 * @ooblen: number of oob bytes to write/read
83 * @oobretlen: number of oob bytes written/read
84 * @ooboffs: offset of oob data in the oob area (only relevant when
85 * mode = MTD_OOB_PLACE)
86 * @datbuf: data buffer - if NULL only oob data are read/written
87 * @oobbuf: oob data buffer
103 u_int32_t size; // Total size of the MTD
105 /* "Major" erase size for the device. Naïve users may take this
106 * to be the only erase size available, or may use the more detailed
107 * information below if they desire
110 /* Minimal writable flash unit size. In case of NOR flash it is 1 (even
111 * though individual bits can be cleared), in case of NAND flash it is
112 * one NAND page (or half, or one-fourths of it), in case of ECC-ed NOR
113 * it is of ECC block size, etc. It is illegal to have writesize = 0.
114 * Any driver registering a struct mtd_info must ensure a writesize of
119 u_int32_t oobsize; // Amount of OOB data per block (e.g. 16)
124 * Reuse some of the above unused fields in the case of NOR flash
125 * with configurable programming regions to avoid modifying the
126 * user visible structure layout/size. Only valid when the
127 * MTD_PROGRAM_REGIONS flag is set.
128 * (Maybe we should have an union for those?)
130 #define MTD_PROGREGION_CTRLMODE_VALID(mtd) (mtd)->oobsize
131 #define MTD_PROGREGION_CTRLMODE_INVALID(mtd) (mtd)->ecctype
133 // Kernel-only stuff starts here.
137 /* ecc layout structure pointer - read only ! */
138 struct nand_ecclayout *ecclayout;
140 /* Data for variable erase regions. If numeraseregions is zero,
141 * it means that the whole device has erasesize as given above.
144 struct mtd_erase_region_info *eraseregions;
146 /* This really shouldn't be here. It can go away in 2.5 */
149 int (*erase) (struct mtd_info *mtd, struct erase_info *instr);
151 /* This stuff for eXecute-In-Place */
152 int (*point) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char **mtdbuf);
154 /* We probably shouldn't allow XIP if the unpoint isn't a NULL */
155 void (*unpoint) (struct mtd_info *mtd, u_char * addr, loff_t from, size_t len);
158 int (*read) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
159 int (*write) (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf);
161 int (*read_oob) (struct mtd_info *mtd, loff_t from,
162 struct mtd_oob_ops *ops);
163 int (*write_oob) (struct mtd_info *mtd, loff_t to,
164 struct mtd_oob_ops *ops);
167 * Methods to access the protection register area, present in some
168 * flash devices. The user data is one time programmable but the
169 * factory data is read only.
171 int (*get_fact_prot_info) (struct mtd_info *mtd, struct otp_info *buf, size_t len);
172 int (*read_fact_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
173 int (*get_user_prot_info) (struct mtd_info *mtd, struct otp_info *buf, size_t len);
174 int (*read_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
175 int (*write_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
176 int (*lock_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len);
178 /* kvec-based read/write methods.
179 NB: The 'count' parameter is the number of _vectors_, each of
180 which contains an (ofs, len) tuple.
182 int (*writev) (struct mtd_info *mtd, const struct kvec *vecs, unsigned long count, loff_t to, size_t *retlen);
185 void (*sync) (struct mtd_info *mtd);
187 /* Chip-supported device locking */
188 int (*lock) (struct mtd_info *mtd, loff_t ofs, size_t len);
189 int (*unlock) (struct mtd_info *mtd, loff_t ofs, size_t len);
191 /* Power Management functions */
192 int (*suspend) (struct mtd_info *mtd);
193 void (*resume) (struct mtd_info *mtd);
195 /* Bad block management functions */
196 int (*block_isbad) (struct mtd_info *mtd, loff_t ofs);
197 int (*block_markbad) (struct mtd_info *mtd, loff_t ofs);
199 struct notifier_block reboot_notifier; /* default mode before reboot */
201 /* ECC status information */
202 struct mtd_ecc_stats ecc_stats;
203 /* Subpage shift (NAND) */
208 struct module *owner;
211 /* If the driver is something smart, like UBI, it may need to maintain
212 * its own reference counting. The below functions are only for driver.
213 * The driver may register its callbacks. These callbacks are not
214 * supposed to be called by MTD users */
215 int (*get_device) (struct mtd_info *mtd);
216 void (*put_device) (struct mtd_info *mtd);
220 /* Kernel-side ioctl definitions */
222 extern int add_mtd_device(struct mtd_info *mtd);
223 extern int del_mtd_device (struct mtd_info *mtd);
225 extern struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num);
226 extern struct mtd_info *get_mtd_device_nm(const char *name);
228 extern void put_mtd_device(struct mtd_info *mtd);
231 struct mtd_notifier {
232 void (*add)(struct mtd_info *mtd);
233 void (*remove)(struct mtd_info *mtd);
234 struct list_head list;
238 extern void register_mtd_user (struct mtd_notifier *new);
239 extern int unregister_mtd_user (struct mtd_notifier *old);
241 int default_mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
242 unsigned long count, loff_t to, size_t *retlen);
244 int default_mtd_readv(struct mtd_info *mtd, struct kvec *vecs,
245 unsigned long count, loff_t from, size_t *retlen);
247 #ifdef CONFIG_MTD_PARTITIONS
248 void mtd_erase_callback(struct erase_info *instr);
250 static inline void mtd_erase_callback(struct erase_info *instr)
253 instr->callback(instr);
258 * Debugging macro and defines
260 #define MTD_DEBUG_LEVEL0 (0) /* Quiet */
261 #define MTD_DEBUG_LEVEL1 (1) /* Audible */
262 #define MTD_DEBUG_LEVEL2 (2) /* Loud */
263 #define MTD_DEBUG_LEVEL3 (3) /* Noisy */
265 #ifdef CONFIG_MTD_DEBUG
266 #define DEBUG(n, args...) \
268 if (n <= CONFIG_MTD_DEBUG_VERBOSE) \
269 printk(KERN_INFO args); \
271 #else /* CONFIG_MTD_DEBUG */
272 #define DEBUG(n, args...) do { } while(0)
274 #endif /* CONFIG_MTD_DEBUG */
276 #endif /* __MTD_MTD_H__ */