[deliverable/linux.git] / include / linux / mtd / mtd.h

/*
 * Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org> et al.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

#ifndef __MTD_MTD_H__
#define __MTD_MTD_H__

#include <linux/types.h>
#include <linux/module.h>
#include <linux/uio.h>
#include <linux/notifier.h>
#include <linux/device.h>

#include <mtd/mtd-abi.h>

#include <asm/div64.h>

#define MTD_CHAR_MAJOR 90
#define MTD_BLOCK_MAJOR 31

#define MTD_ERASE_PENDING      	0x01
#define MTD_ERASING		0x02
#define MTD_ERASE_SUSPEND	0x04
#define MTD_ERASE_DONE          0x08
#define MTD_ERASE_FAILED        0x10

#define MTD_FAIL_ADDR_UNKNOWN -1LL

/* If the erase fails, fail_addr might indicate exactly which block failed.  If
   fail_addr = MTD_FAIL_ADDR_UNKNOWN, the failure was not at the device level or was not
   specific to any particular block. */
struct erase_info {
	struct mtd_info *mtd;
	uint64_t addr;
	uint64_t len;
	uint64_t fail_addr;
	u_long time;
	u_long retries;
	unsigned dev;
	unsigned cell;
	void (*callback) (struct erase_info *self);
	u_long priv;
	u_char state;
	struct erase_info *next;
};

struct mtd_erase_region_info {
	uint64_t offset;			/* At which this region starts, from the beginning of the MTD */
	uint32_t erasesize;		/* For this region */
	uint32_t numblocks;		/* Number of blocks of erasesize in this region */
	unsigned long *lockmap;		/* If keeping bitmap of locks */
};

/*
 * oob operation modes
 *
 * MTD_OOB_PLACE:	oob data are placed at the given offset
 * MTD_OOB_AUTO:	oob data are automatically placed at the free areas
 *			which are defined by the ecclayout
 * MTD_OOB_RAW:		mode to read oob and data without doing ECC checking
 */
typedef enum {
	MTD_OOB_PLACE,
	MTD_OOB_AUTO,
	MTD_OOB_RAW,
} mtd_oob_mode_t;

/**
 * struct mtd_oob_ops - oob operation operands
 * @mode:	operation mode
 *
 * @len:	number of data bytes to write/read
 *
 * @retlen:	number of data bytes written/read
 *
 * @ooblen:	number of oob bytes to write/read
 * @oobretlen:	number of oob bytes written/read
 * @ooboffs:	offset of oob data in the oob area (only relevant when
 *		mode = MTD_OOB_PLACE)
 * @datbuf:	data buffer - if NULL only oob data are read/written
 * @oobbuf:	oob data buffer
 *
 * Note, it is allowed to read more than one OOB area at one go, but not write.
 * The interface assumes that the OOB write requests program only one page's
 * OOB area.
 */
struct mtd_oob_ops {
	mtd_oob_mode_t	mode;
	size_t		len;
	size_t		retlen;
	size_t		ooblen;
	size_t		oobretlen;
	uint32_t	ooboffs;
	uint8_t		*datbuf;
	uint8_t		*oobbuf;
};

struct mtd_info {
	u_char type;
	uint32_t flags;
	uint64_t size;	 // Total size of the MTD

	/* "Major" erase size for the device. Naïve users may take this
	 * to be the only erase size available, or may use the more detailed
	 * information below if they desire
	 */
	uint32_t erasesize;
	/* Minimal writable flash unit size. In case of NOR flash it is 1 (even
	 * though individual bits can be cleared), in case of NAND flash it is
	 * one NAND page (or half, or one-fourths of it), in case of ECC-ed NOR
	 * it is of ECC block size, etc. It is illegal to have writesize = 0.
	 * Any driver registering a struct mtd_info must ensure a writesize of
	 * 1 or larger.
	 */
	uint32_t writesize;

	uint32_t oobsize;   // Amount of OOB data per block (e.g. 16)
	uint32_t oobavail;  // Available OOB bytes per block

	/*
	 * If erasesize is a power of 2 then the shift is stored in
	 * erasesize_shift otherwise erasesize_shift is zero. Ditto writesize.
	 */
	unsigned int erasesize_shift;
	unsigned int writesize_shift;
	/* Masks based on erasesize_shift and writesize_shift */
	unsigned int erasesize_mask;
	unsigned int writesize_mask;

	// Kernel-only stuff starts here.
	const char *name;
	int index;

	/* ecc layout structure pointer - read only ! */
	struct nand_ecclayout *ecclayout;

	/* Data for variable erase regions. If numeraseregions is zero,
	 * it means that the whole device has erasesize as given above.
	 */
	int numeraseregions;
	struct mtd_erase_region_info *eraseregions;

	/*
	 * Erase is an asynchronous operation.  Device drivers are supposed
	 * to call instr->callback() whenever the operation completes, even
	 * if it completes with a failure.
	 * Callers are supposed to pass a callback function and wait for it
	 * to be called before writing to the block.
	 */
	int (*erase) (struct mtd_info *mtd, struct erase_info *instr);

	/* This stuff for eXecute-In-Place */
	/* phys is optional and may be set to NULL */
	int (*point) (struct mtd_info *mtd, loff_t from, size_t len,
			size_t *retlen, void **virt, resource_size_t *phys);

	/* We probably shouldn't allow XIP if the unpoint isn't a NULL */
	void (*unpoint) (struct mtd_info *mtd, loff_t from, size_t len);

	/* Allow NOMMU mmap() to directly map the device (if not NULL)
	 * - return the address to which the offset maps
	 * - return -ENOSYS to indicate refusal to do the mapping
	 */
	unsigned long (*get_unmapped_area) (struct mtd_info *mtd,
					    unsigned long len,
					    unsigned long offset,
					    unsigned long flags);

	/* Backing device capabilities for this device
	 * - provides mmap capabilities
	 */
	struct backing_dev_info *backing_dev_info;


	int (*read) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
	int (*write) (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf);

	/* In blackbox flight recorder like scenarios we want to make successful
	   writes in interrupt context. panic_write() is only intended to be
	   called when its known the kernel is about to panic and we need the
	   write to succeed. Since the kernel is not going to be running for much
	   longer, this function can break locks and delay to ensure the write
	   succeeds (but not sleep). */

	int (*panic_write) (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf);

	int (*read_oob) (struct mtd_info *mtd, loff_t from,
			 struct mtd_oob_ops *ops);
	int (*write_oob) (struct mtd_info *mtd, loff_t to,
			 struct mtd_oob_ops *ops);

	/*
	 * Methods to access the protection register area, present in some
	 * flash devices. The user data is one time programmable but the
	 * factory data is read only.
	 */
	int (*get_fact_prot_info) (struct mtd_info *mtd, struct otp_info *buf, size_t len);
	int (*read_fact_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
	int (*get_user_prot_info) (struct mtd_info *mtd, struct otp_info *buf, size_t len);
	int (*read_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
	int (*write_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);
	int (*lock_user_prot_reg) (struct mtd_info *mtd, loff_t from, size_t len);

	/* kvec-based read/write methods.
	   NB: The 'count' parameter is the number of _vectors_, each of
	   which contains an (ofs, len) tuple.
	*/
	int (*writev) (struct mtd_info *mtd, const struct kvec *vecs, unsigned long count, loff_t to, size_t *retlen);

	/* Sync */
	void (*sync) (struct mtd_info *mtd);

	/* Chip-supported device locking */
	int (*lock) (struct mtd_info *mtd, loff_t ofs, uint64_t len);
	int (*unlock) (struct mtd_info *mtd, loff_t ofs, uint64_t len);
	int (*is_locked) (struct mtd_info *mtd, loff_t ofs, uint64_t len);

	/* Power Management functions */
	int (*suspend) (struct mtd_info *mtd);
	void (*resume) (struct mtd_info *mtd);

	/* Bad block management functions */
	int (*block_isbad) (struct mtd_info *mtd, loff_t ofs);
	int (*block_markbad) (struct mtd_info *mtd, loff_t ofs);

	struct notifier_block reboot_notifier;  /* default mode before reboot */

	/* ECC status information */
	struct mtd_ecc_stats ecc_stats;
	/* Subpage shift (NAND) */
	int subpage_sft;

	void *priv;

	struct module *owner;
	struct device dev;
	int usecount;

	/* If the driver is something smart, like UBI, it may need to maintain
	 * its own reference counting. The below functions are only for driver.
	 * The driver may register its callbacks. These callbacks are not
	 * supposed to be called by MTD users */
	int (*get_device) (struct mtd_info *mtd);
	void (*put_device) (struct mtd_info *mtd);
};

static inline struct mtd_info *dev_to_mtd(struct device *dev)
{
	return dev ? dev_get_drvdata(dev) : NULL;
}

static inline uint32_t mtd_div_by_eb(uint64_t sz, struct mtd_info *mtd)
{
	if (mtd->erasesize_shift)
		return sz >> mtd->erasesize_shift;
	do_div(sz, mtd->erasesize);
	return sz;
}

static inline uint32_t mtd_mod_by_eb(uint64_t sz, struct mtd_info *mtd)
{
	if (mtd->erasesize_shift)
		return sz & mtd->erasesize_mask;
	return do_div(sz, mtd->erasesize);
}

static inline uint32_t mtd_div_by_ws(uint64_t sz, struct mtd_info *mtd)
{
	if (mtd->writesize_shift)
		return sz >> mtd->writesize_shift;
	do_div(sz, mtd->writesize);
	return sz;
}

static inline uint32_t mtd_mod_by_ws(uint64_t sz, struct mtd_info *mtd)
{
	if (mtd->writesize_shift)
		return sz & mtd->writesize_mask;
	return do_div(sz, mtd->writesize);
}

	/* Kernel-side ioctl definitions */

extern int add_mtd_device(struct mtd_info *mtd);
extern int del_mtd_device (struct mtd_info *mtd);

extern struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num);
extern int __get_mtd_device(struct mtd_info *mtd);
extern void __put_mtd_device(struct mtd_info *mtd);
extern struct mtd_info *get_mtd_device_nm(const char *name);
extern void put_mtd_device(struct mtd_info *mtd);


struct mtd_notifier {
	void (*add)(struct mtd_info *mtd);
	void (*remove)(struct mtd_info *mtd);
	struct list_head list;
};


extern void register_mtd_user (struct mtd_notifier *new);
extern int unregister_mtd_user (struct mtd_notifier *old);

int default_mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
		       unsigned long count, loff_t to, size_t *retlen);

int default_mtd_readv(struct mtd_info *mtd, struct kvec *vecs,
		      unsigned long count, loff_t from, size_t *retlen);

#ifdef CONFIG_MTD_PARTITIONS
void mtd_erase_callback(struct erase_info *instr);
#else
static inline void mtd_erase_callback(struct erase_info *instr)
{
	if (instr->callback)
		instr->callback(instr);
}
#endif

/*
 * Debugging macro and defines
 */
#define MTD_DEBUG_LEVEL0	(0)	/* Quiet   */
#define MTD_DEBUG_LEVEL1	(1)	/* Audible */
#define MTD_DEBUG_LEVEL2	(2)	/* Loud    */
#define MTD_DEBUG_LEVEL3	(3)	/* Noisy   */

#ifdef CONFIG_MTD_DEBUG
#define DEBUG(n, args...)				\
	do {						\
		if (n <= CONFIG_MTD_DEBUG_VERBOSE)	\
			printk(KERN_INFO args);		\
	} while(0)
#else /* CONFIG_MTD_DEBUG */
#define DEBUG(n, args...)				\
	do {						\
		if (0)					\
			printk(KERN_INFO args);		\
	} while(0)

#endif /* CONFIG_MTD_DEBUG */

#endif /* __MTD_MTD_H__ */
Commit	Line	Data
61ecfa87	1	/*
a1452a37 DW	2	* Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org> et al.
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License as published by
	6	* the Free Software Foundation; either version 2 of the License, or
	7	* (at your option) any later version.
	8	*
	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License
	15	* along with this program; if not, write to the Free Software
	16	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
1da177e4	17	*
1da177e4 LT	18	*/
	19
	20	#ifndef __MTD_MTD_H__
	21	#define __MTD_MTD_H__
	22
1da177e4 LT	23	#include <linux/types.h>
	24	#include <linux/module.h>
	25	#include <linux/uio.h>
963a6fb0	26	#include <linux/notifier.h>
1f24b5a8	27	#include <linux/device.h>
1da177e4	28
1da177e4 LT	29	#include <mtd/mtd-abi.h>
1da177e4 LT	30
69423d99 AH	31	#include <asm/div64.h>
69423d99 AH	32
1da177e4 LT	33	#define MTD_CHAR_MAJOR 90
1da177e4 LT	34	#define MTD_BLOCK_MAJOR 31
1da177e4 LT	35
	36	#define MTD_ERASE_PENDING 0x01
	37	#define MTD_ERASING 0x02
	38	#define MTD_ERASE_SUSPEND 0x04
	39	#define MTD_ERASE_DONE 0x08
	40	#define MTD_ERASE_FAILED 0x10
	41
69423d99	42	#define MTD_FAIL_ADDR_UNKNOWN -1LL
bb0eb217	43
1da177e4	44	/* If the erase fails, fail_addr might indicate exactly which block failed. If
bb0eb217	45	fail_addr = MTD_FAIL_ADDR_UNKNOWN, the failure was not at the device level or was not
1da177e4 LT	46	specific to any particular block. */
	47	struct erase_info {
	48	struct mtd_info *mtd;
69423d99 AH	49	uint64_t addr;
	50	uint64_t len;
	51	uint64_t fail_addr;
1da177e4 LT	52	u_long time;
1da177e4 LT	53	u_long retries;
26cdb67c DW	54	unsigned dev;
26cdb67c DW	55	unsigned cell;
1da177e4 LT	56	void (callback) (struct erase_info self);
	57	u_long priv;
	58	u_char state;
	59	struct erase_info *next;
	60	};
	61
	62	struct mtd_erase_region_info {
69423d99	63	uint64_t offset; /* At which this region starts, from the beginning of the MTD */
26cdb67c DW	64	uint32_t erasesize; /* For this region */
26cdb67c DW	65	uint32_t numblocks; /* Number of blocks of erasesize in this region */
0ecbc81a	66	unsigned long lockmap; / If keeping bitmap of locks */
1da177e4 LT	67	};
1da177e4 LT	68
8593fbc6 TG	69	/*
	70	* oob operation modes
	71	*
	72	* MTD_OOB_PLACE: oob data are placed at the given offset
	73	* MTD_OOB_AUTO: oob data are automatically placed at the free areas
	74	* which are defined by the ecclayout
b64d39d8	75	* MTD_OOB_RAW: mode to read oob and data without doing ECC checking
8593fbc6 TG	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	*
7014568b	87	* @len: number of data bytes to write/read
8593fbc6	88	*
7014568b	89	* @retlen: number of data bytes written/read
8593fbc6	90	*
7014568b VW	91	* @ooblen: number of oob bytes to write/read
7014568b VW	92	* @oobretlen: number of oob bytes written/read
8593fbc6 TG	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
73a4421c	97	*
025dfdaf	98	* Note, it is allowed to read more than one OOB area at one go, but not write.
73a4421c AB	99	* The interface assumes that the OOB write requests program only one page's
73a4421c AB	100	* OOB area.
8593fbc6 TG	101	*/
	102	struct mtd_oob_ops {
	103	mtd_oob_mode_t mode;
	104	size_t len;
	105	size_t retlen;
	106	size_t ooblen;
7014568b	107	size_t oobretlen;
8593fbc6 TG	108	uint32_t ooboffs;
	109	uint8_t *datbuf;
	110	uint8_t *oobbuf;
	111	};
	112
1da177e4 LT	113	struct mtd_info {
1da177e4 LT	114	u_char type;
26cdb67c	115	uint32_t flags;
69423d99	116	uint64_t size; // Total size of the MTD
1da177e4	117
151e7659	118	/* "Major" erase size for the device. Naïve users may take this
1da177e4 LT	119	* to be the only erase size available, or may use the more detailed
	120	* information below if they desire
	121	*/
26cdb67c	122	uint32_t erasesize;
783ed81f AB	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.
28318776	129	*/
26cdb67c	130	uint32_t writesize;
1da177e4	131
26cdb67c DW	132	uint32_t oobsize; // Amount of OOB data per block (e.g. 16)
26cdb67c DW	133	uint32_t oobavail; // Available OOB bytes per block
1da177e4	134
69423d99 AH	135	/*
	136	* If erasesize is a power of 2 then the shift is stored in
	137	* erasesize_shift otherwise erasesize_shift is zero. Ditto writesize.
	138	*/
	139	unsigned int erasesize_shift;
	140	unsigned int writesize_shift;
	141	/* Masks based on erasesize_shift and writesize_shift */
	142	unsigned int erasesize_mask;
	143	unsigned int writesize_mask;
638d9838	144
1da177e4	145	// Kernel-only stuff starts here.
eadcf0d7	146	const char *name;
1da177e4 LT	147	int index;
1da177e4 LT	148
5bd34c09 TG	149	/* ecc layout structure pointer - read only ! */
5bd34c09 TG	150	struct nand_ecclayout *ecclayout;
1da177e4 LT	151
1da177e4 LT	152	/* Data for variable erase regions. If numeraseregions is zero,
61ecfa87	153	* it means that the whole device has erasesize as given above.
1da177e4 LT	154	*/
1da177e4 LT	155	int numeraseregions;
61ecfa87	156	struct mtd_erase_region_info *eraseregions;
1da177e4	157
b38178ee JE	158	/*
	159	* Erase is an asynchronous operation. Device drivers are supposed
	160	* to call instr->callback() whenever the operation completes, even
	161	* if it completes with a failure.
	162	* Callers are supposed to pass a callback function and wait for it
	163	* to be called before writing to the block.
	164	*/
1da177e4 LT	165	int (erase) (struct mtd_info mtd, struct erase_info *instr);
	166
	167	/* This stuff for eXecute-In-Place */
a98889f3 JH	168	/* phys is optional and may be set to NULL */
	169	int (point) (struct mtd_info mtd, loff_t from, size_t len,
	170	size_t retlen, void virt, resource_size_t phys);
1da177e4 LT	171
1da177e4 LT	172	/* We probably shouldn't allow XIP if the unpoint isn't a NULL */
a98889f3	173	void (unpoint) (struct mtd_info mtd, loff_t from, size_t len);
1da177e4	174
402d3265 DH	175	/* Allow NOMMU mmap() to directly map the device (if not NULL)
	176	* - return the address to which the offset maps
	177	* - return -ENOSYS to indicate refusal to do the mapping
	178	*/
	179	unsigned long (get_unmapped_area) (struct mtd_info mtd,
	180	unsigned long len,
	181	unsigned long offset,
	182	unsigned long flags);
	183
	184	/* Backing device capabilities for this device
	185	* - provides mmap capabilities
	186	*/
	187	struct backing_dev_info *backing_dev_info;
	188
1da177e4 LT	189
	190	int (read) (struct mtd_info mtd, loff_t from, size_t len, size_t retlen, u_char buf);
	191	int (write) (struct mtd_info mtd, loff_t to, size_t len, size_t retlen, const u_char buf);
	192
388bbb09 RP	193	/* In blackbox flight recorder like scenarios we want to make successful
	194	writes in interrupt context. panic_write() is only intended to be
	195	called when its known the kernel is about to panic and we need the
	196	write to succeed. Since the kernel is not going to be running for much
	197	longer, this function can break locks and delay to ensure the write
	198	succeeds (but not sleep). */
	199
	200	int (panic_write) (struct mtd_info mtd, loff_t to, size_t len, size_t retlen, const u_char buf);
	201
8593fbc6 TG	202	int (read_oob) (struct mtd_info mtd, loff_t from,
	203	struct mtd_oob_ops *ops);
	204	int (write_oob) (struct mtd_info mtd, loff_t to,
	205	struct mtd_oob_ops *ops);
1da177e4	206
61ecfa87 TG	207	/*
61ecfa87 TG	208	* Methods to access the protection register area, present in some
1da177e4	209	* flash devices. The user data is one time programmable but the
61ecfa87	210	* factory data is read only.
1da177e4	211	*/
f77814dd	212	int (get_fact_prot_info) (struct mtd_info mtd, struct otp_info *buf, size_t len);
1da177e4	213	int (read_fact_prot_reg) (struct mtd_info mtd, loff_t from, size_t len, size_t retlen, u_char buf);
f77814dd NP	214	int (get_user_prot_info) (struct mtd_info mtd, struct otp_info *buf, size_t len);
f77814dd NP	215	int (read_user_prot_reg) (struct mtd_info mtd, loff_t from, size_t len, size_t retlen, u_char buf);
1da177e4	216	int (write_user_prot_reg) (struct mtd_info mtd, loff_t from, size_t len, size_t retlen, u_char buf);
f77814dd	217	int (lock_user_prot_reg) (struct mtd_info mtd, loff_t from, size_t len);
1da177e4	218
2528e8cd	219	/* kvec-based read/write methods.
61ecfa87	220	NB: The 'count' parameter is the number of _vectors_, each of
1da177e4 LT	221	which contains an (ofs, len) tuple.
1da177e4 LT	222	*/
1da177e4	223	int (writev) (struct mtd_info mtd, const struct kvec vecs, unsigned long count, loff_t to, size_t retlen);
1da177e4 LT	224
	225	/* Sync */
	226	void (sync) (struct mtd_info mtd);
	227
	228	/* Chip-supported device locking */
69423d99 AH	229	int (lock) (struct mtd_info mtd, loff_t ofs, uint64_t len);
69423d99 AH	230	int (unlock) (struct mtd_info mtd, loff_t ofs, uint64_t len);
9938424f	231	int (is_locked) (struct mtd_info mtd, loff_t ofs, uint64_t len);
1da177e4 LT	232
	233	/* Power Management functions */
	234	int (suspend) (struct mtd_info mtd);
	235	void (resume) (struct mtd_info mtd);
	236
	237	/* Bad block management functions */
	238	int (block_isbad) (struct mtd_info mtd, loff_t ofs);
	239	int (block_markbad) (struct mtd_info mtd, loff_t ofs);
	240
963a6fb0 NP	241	struct notifier_block reboot_notifier; /* default mode before reboot */
963a6fb0 NP	242
7fac4648 TG	243	/* ECC status information */
7fac4648 TG	244	struct mtd_ecc_stats ecc_stats;
29072b96 TG	245	/* Subpage shift (NAND) */
29072b96 TG	246	int subpage_sft;
7fac4648	247
1da177e4 LT	248	void *priv;
	249
	250	struct module *owner;
1f24b5a8	251	struct device dev;
1da177e4	252	int usecount;
9fe912ce AB	253
	254	/* If the driver is something smart, like UBI, it may need to maintain
	255	* its own reference counting. The below functions are only for driver.
	256	* The driver may register its callbacks. These callbacks are not
	257	* supposed to be called by MTD users */
	258	int (get_device) (struct mtd_info mtd);
	259	void (put_device) (struct mtd_info mtd);
1da177e4 LT	260	};
1da177e4 LT	261
1f24b5a8 DB	262	static inline struct mtd_info dev_to_mtd(struct device dev)
1f24b5a8 DB	263	{
6afc4fdb	264	return dev ? dev_get_drvdata(dev) : NULL;
1f24b5a8 DB	265	}
1f24b5a8 DB	266
26cdb67c	267	static inline uint32_t mtd_div_by_eb(uint64_t sz, struct mtd_info *mtd)
69423d99 AH	268	{
	269	if (mtd->erasesize_shift)
	270	return sz >> mtd->erasesize_shift;
	271	do_div(sz, mtd->erasesize);
	272	return sz;
	273	}
	274
26cdb67c	275	static inline uint32_t mtd_mod_by_eb(uint64_t sz, struct mtd_info *mtd)
69423d99 AH	276	{
	277	if (mtd->erasesize_shift)
	278	return sz & mtd->erasesize_mask;
	279	return do_div(sz, mtd->erasesize);
	280	}
	281
26cdb67c	282	static inline uint32_t mtd_div_by_ws(uint64_t sz, struct mtd_info *mtd)
69423d99 AH	283	{
	284	if (mtd->writesize_shift)
	285	return sz >> mtd->writesize_shift;
	286	do_div(sz, mtd->writesize);
	287	return sz;
	288	}
	289
26cdb67c	290	static inline uint32_t mtd_mod_by_ws(uint64_t sz, struct mtd_info *mtd)
69423d99 AH	291	{
	292	if (mtd->writesize_shift)
	293	return sz & mtd->writesize_mask;
	294	return do_div(sz, mtd->writesize);
	295	}
1da177e4 LT	296
	297	/* Kernel-side ioctl definitions */
	298
	299	extern int add_mtd_device(struct mtd_info *mtd);
	300	extern int del_mtd_device (struct mtd_info *mtd);
	301
	302	extern struct mtd_info get_mtd_device(struct mtd_info mtd, int num);
3bd45657 ML	303	extern int __get_mtd_device(struct mtd_info *mtd);
3bd45657 ML	304	extern void __put_mtd_device(struct mtd_info *mtd);
7799308f	305	extern struct mtd_info get_mtd_device_nm(const char name);
1da177e4 LT	306	extern void put_mtd_device(struct mtd_info *mtd);
	307
	308
	309	struct mtd_notifier {
	310	void (add)(struct mtd_info mtd);
	311	void (remove)(struct mtd_info mtd);
	312	struct list_head list;
	313	};
	314
	315
	316	extern void register_mtd_user (struct mtd_notifier *new);
	317	extern int unregister_mtd_user (struct mtd_notifier *old);
	318
	319	int default_mtd_writev(struct mtd_info mtd, const struct kvec vecs,
	320	unsigned long count, loff_t to, size_t *retlen);
	321
	322	int default_mtd_readv(struct mtd_info mtd, struct kvec vecs,
	323	unsigned long count, loff_t from, size_t *retlen);
	324
1da177e4 LT	325	#ifdef CONFIG_MTD_PARTITIONS
	326	void mtd_erase_callback(struct erase_info *instr);
	327	#else
	328	static inline void mtd_erase_callback(struct erase_info *instr)
	329	{
	330	if (instr->callback)
	331	instr->callback(instr);
	332	}
	333	#endif
	334
	335	/*
	336	* Debugging macro and defines
	337	*/
	338	#define MTD_DEBUG_LEVEL0 (0) /* Quiet */
	339	#define MTD_DEBUG_LEVEL1 (1) /* Audible */
	340	#define MTD_DEBUG_LEVEL2 (2) /* Loud */
	341	#define MTD_DEBUG_LEVEL3 (3) /* Noisy */
	342
	343	#ifdef CONFIG_MTD_DEBUG
	344	#define DEBUG(n, args...) \
f4a43cfc	345	do { \
1da177e4 LT	346	if (n <= CONFIG_MTD_DEBUG_VERBOSE) \
	347	printk(KERN_INFO args); \
	348	} while(0)
	349	#else /* CONFIG_MTD_DEBUG */
95b1bc20 DB	350	#define DEBUG(n, args...) \
	351	do { \
	352	if (0) \
	353	printk(KERN_INFO args); \
	354	} while(0)
1da177e4 LT	355
	356	#endif /* CONFIG_MTD_DEBUG */
	357
	358	#endif /* __MTD_MTD_H__ */