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.
12 #include <linux/types.h>
13 #include <linux/module.h>
14 #include <linux/uio.h>
15 #include <linux/notifier.h>
17 #include <linux/mtd/compatmac.h>
18 #include <mtd/mtd-abi.h>
20 #define MTD_CHAR_MAJOR 90
21 #define MTD_BLOCK_MAJOR 31
22 #define MAX_MTD_DEVICES 32
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
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. */
42 void (*callback) (struct erase_info *self);
45 struct erase_info *next;
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 */
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
72 * struct mtd_oob_ops - oob operation operands
73 * @mode: operation mode
75 * @len: number of data bytes to write/read
77 * @retlen: number of data bytes written/read
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
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
104 u_int32_t size; // Total size of the MTD
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
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
120 u_int32_t oobsize; // Amount of OOB data per block (e.g. 16)
121 u_int32_t oobavail; // Available OOB bytes per block
123 // Kernel-only stuff starts here.
127 /* ecc layout structure pointer - read only ! */
128 struct nand_ecclayout *ecclayout;
130 /* Data for variable erase regions. If numeraseregions is zero,
131 * it means that the whole device has erasesize as given above.
134 struct mtd_erase_region_info *eraseregions;
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.
143 int (*erase) (struct mtd_info *mtd, struct erase_info *instr);
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);
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);
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);
155 /* In blackbox flight recorder like scenarios we want to make successful
156 writes in interrupt context. panic_write() is only intended to be
157 called when its known the kernel is about to panic and we need the
158 write to succeed. Since the kernel is not going to be running for much
159 longer, this function can break locks and delay to ensure the write
160 succeeds (but not sleep). */
162 int (*panic_write) (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf);
164 int (*read_oob) (struct mtd_info *mtd, loff_t from,
165 struct mtd_oob_ops *ops);
166 int (*write_oob) (struct mtd_info *mtd, loff_t to,
167 struct mtd_oob_ops *ops);
170 * Methods to access the protection register area, present in some
171 * flash devices. The user data is one time programmable but the
172 * factory data is read only.
174 int (*get_fact_prot_info) (struct mtd_info *mtd, struct otp_info *buf, size_t len);
175 int (*read_fact_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
176 int (*get_user_prot_info) (struct mtd_info *mtd, struct otp_info *buf, size_t len);
177 int (*read_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
178 int (*write_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
179 int (*lock_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len);
181 /* kvec-based read/write methods.
182 NB: The 'count' parameter is the number of _vectors_, each of
183 which contains an (ofs, len) tuple.
185 int (*writev) (struct mtd_info *mtd, const struct kvec *vecs, unsigned long count, loff_t to, size_t *retlen);
188 void (*sync) (struct mtd_info *mtd);
190 /* Chip-supported device locking */
191 int (*lock) (struct mtd_info *mtd, loff_t ofs, size_t len);
192 int (*unlock) (struct mtd_info *mtd, loff_t ofs, size_t len);
194 /* Power Management functions */
195 int (*suspend) (struct mtd_info *mtd);
196 void (*resume) (struct mtd_info *mtd);
198 /* Bad block management functions */
199 int (*block_isbad) (struct mtd_info *mtd, loff_t ofs);
200 int (*block_markbad) (struct mtd_info *mtd, loff_t ofs);
202 struct notifier_block reboot_notifier; /* default mode before reboot */
204 /* ECC status information */
205 struct mtd_ecc_stats ecc_stats;
206 /* Subpage shift (NAND) */
211 struct module *owner;
214 /* If the driver is something smart, like UBI, it may need to maintain
215 * its own reference counting. The below functions are only for driver.
216 * The driver may register its callbacks. These callbacks are not
217 * supposed to be called by MTD users */
218 int (*get_device) (struct mtd_info *mtd);
219 void (*put_device) (struct mtd_info *mtd);
223 /* Kernel-side ioctl definitions */
225 extern int add_mtd_device(struct mtd_info *mtd);
226 extern int del_mtd_device (struct mtd_info *mtd);
228 extern struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num);
229 extern struct mtd_info *get_mtd_device_nm(const char *name);
231 extern void put_mtd_device(struct mtd_info *mtd);
234 struct mtd_notifier {
235 void (*add)(struct mtd_info *mtd);
236 void (*remove)(struct mtd_info *mtd);
237 struct list_head list;
241 extern void register_mtd_user (struct mtd_notifier *new);
242 extern int unregister_mtd_user (struct mtd_notifier *old);
244 int default_mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
245 unsigned long count, loff_t to, size_t *retlen);
247 int default_mtd_readv(struct mtd_info *mtd, struct kvec *vecs,
248 unsigned long count, loff_t from, size_t *retlen);
250 #ifdef CONFIG_MTD_PARTITIONS
251 void mtd_erase_callback(struct erase_info *instr);
253 static inline void mtd_erase_callback(struct erase_info *instr)
256 instr->callback(instr);
261 * Debugging macro and defines
263 #define MTD_DEBUG_LEVEL0 (0) /* Quiet */
264 #define MTD_DEBUG_LEVEL1 (1) /* Audible */
265 #define MTD_DEBUG_LEVEL2 (2) /* Loud */
266 #define MTD_DEBUG_LEVEL3 (3) /* Noisy */
268 #ifdef CONFIG_MTD_DEBUG
269 #define DEBUG(n, args...) \
271 if (n <= CONFIG_MTD_DEBUG_VERBOSE) \
272 printk(KERN_INFO args); \
274 #else /* CONFIG_MTD_DEBUG */
275 #define DEBUG(n, args...) do { } while(0)
277 #endif /* CONFIG_MTD_DEBUG */
279 #endif /* __MTD_MTD_H__ */