2 * $Id: mtd.h,v 1.61 2005/11/07 11:14:54 gleixner Exp $
13 #error This is a kernel header. Perhaps include mtd-user.h instead?
16 #include <linux/config.h>
17 #include <linux/types.h>
18 #include <linux/module.h>
19 #include <linux/uio.h>
20 #include <linux/notifier.h>
22 #include <linux/mtd/compatmac.h>
23 #include <mtd/mtd-abi.h>
25 #define MTD_CHAR_MAJOR 90
26 #define MTD_BLOCK_MAJOR 31
27 #define MAX_MTD_DEVICES 16
29 #define MTD_ERASE_PENDING 0x01
30 #define MTD_ERASING 0x02
31 #define MTD_ERASE_SUSPEND 0x04
32 #define MTD_ERASE_DONE 0x08
33 #define MTD_ERASE_FAILED 0x10
35 /* If the erase fails, fail_addr might indicate exactly which block failed. If
36 fail_addr = 0xffffffff, the failure was not at the device level or was not
37 specific to any particular block. */
47 void (*callback) (struct erase_info *self);
50 struct erase_info *next;
53 struct mtd_erase_region_info {
54 u_int32_t offset; /* At which this region starts, from the beginning of the MTD */
55 u_int32_t erasesize; /* For this region */
56 u_int32_t numblocks; /* Number of blocks of erasesize in this region */
60 * struct mtd_ecc_stats - error correction status
62 * @corrected: number of corrected bits
63 * @failed: number of uncorrectable errors
65 struct mtd_ecc_stats {
66 unsigned long corrected;
73 u_int32_t size; // Total size of the MTD
75 /* "Major" erase size for the device. Naïve users may take this
76 * to be the only erase size available, or may use the more detailed
77 * information below if they desire
80 /* Smallest availlable size for writing to the device. For NAND,
81 * this is the page size, for some NOR chips, the size of ECC
86 u_int32_t oobsize; // Amount of OOB data per block (e.g. 16)
91 * Reuse some of the above unused fields in the case of NOR flash
92 * with configurable programming regions to avoid modifying the
93 * user visible structure layout/size. Only valid when the
94 * MTD_PROGRAM_REGIONS flag is set.
95 * (Maybe we should have an union for those?)
97 #define MTD_PROGREGION_CTRLMODE_VALID(mtd) (mtd)->oobsize
98 #define MTD_PROGREGION_CTRLMODE_INVALID(mtd) (mtd)->ecctype
100 // Kernel-only stuff starts here.
104 /* ecc layout structure pointer - read only ! */
105 struct nand_ecclayout *ecclayout;
107 /* Data for variable erase regions. If numeraseregions is zero,
108 * it means that the whole device has erasesize as given above.
111 struct mtd_erase_region_info *eraseregions;
113 /* This really shouldn't be here. It can go away in 2.5 */
116 int (*erase) (struct mtd_info *mtd, struct erase_info *instr);
118 /* This stuff for eXecute-In-Place */
119 int (*point) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char **mtdbuf);
121 /* We probably shouldn't allow XIP if the unpoint isn't a NULL */
122 void (*unpoint) (struct mtd_info *mtd, u_char * addr, loff_t from, size_t len);
125 int (*read) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
126 int (*write) (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf);
128 int (*read_oob) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
129 int (*write_oob) (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf);
132 * Methods to access the protection register area, present in some
133 * flash devices. The user data is one time programmable but the
134 * factory data is read only.
136 int (*get_fact_prot_info) (struct mtd_info *mtd, struct otp_info *buf, size_t len);
137 int (*read_fact_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
138 int (*get_user_prot_info) (struct mtd_info *mtd, struct otp_info *buf, size_t len);
139 int (*read_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
140 int (*write_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
141 int (*lock_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len);
143 /* kvec-based read/write methods.
144 NB: The 'count' parameter is the number of _vectors_, each of
145 which contains an (ofs, len) tuple.
147 int (*writev) (struct mtd_info *mtd, const struct kvec *vecs, unsigned long count, loff_t to, size_t *retlen);
150 void (*sync) (struct mtd_info *mtd);
152 /* Chip-supported device locking */
153 int (*lock) (struct mtd_info *mtd, loff_t ofs, size_t len);
154 int (*unlock) (struct mtd_info *mtd, loff_t ofs, size_t len);
156 /* Power Management functions */
157 int (*suspend) (struct mtd_info *mtd);
158 void (*resume) (struct mtd_info *mtd);
160 /* Bad block management functions */
161 int (*block_isbad) (struct mtd_info *mtd, loff_t ofs);
162 int (*block_markbad) (struct mtd_info *mtd, loff_t ofs);
164 struct notifier_block reboot_notifier; /* default mode before reboot */
166 /* ECC status information */
167 struct mtd_ecc_stats ecc_stats;
171 struct module *owner;
176 /* Kernel-side ioctl definitions */
178 extern int add_mtd_device(struct mtd_info *mtd);
179 extern int del_mtd_device (struct mtd_info *mtd);
181 extern struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num);
183 extern void put_mtd_device(struct mtd_info *mtd);
186 struct mtd_notifier {
187 void (*add)(struct mtd_info *mtd);
188 void (*remove)(struct mtd_info *mtd);
189 struct list_head list;
193 extern void register_mtd_user (struct mtd_notifier *new);
194 extern int unregister_mtd_user (struct mtd_notifier *old);
196 int default_mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
197 unsigned long count, loff_t to, size_t *retlen);
199 int default_mtd_readv(struct mtd_info *mtd, struct kvec *vecs,
200 unsigned long count, loff_t from, size_t *retlen);
202 #ifdef CONFIG_MTD_PARTITIONS
203 void mtd_erase_callback(struct erase_info *instr);
205 static inline void mtd_erase_callback(struct erase_info *instr)
208 instr->callback(instr);
213 * Debugging macro and defines
215 #define MTD_DEBUG_LEVEL0 (0) /* Quiet */
216 #define MTD_DEBUG_LEVEL1 (1) /* Audible */
217 #define MTD_DEBUG_LEVEL2 (2) /* Loud */
218 #define MTD_DEBUG_LEVEL3 (3) /* Noisy */
220 #ifdef CONFIG_MTD_DEBUG
221 #define DEBUG(n, args...) \
223 if (n <= CONFIG_MTD_DEBUG_VERBOSE) \
224 printk(KERN_INFO args); \
226 #else /* CONFIG_MTD_DEBUG */
227 #define DEBUG(n, args...) do { } while(0)
229 #endif /* CONFIG_MTD_DEBUG */
231 #endif /* __MTD_MTD_H__ */