[people/ms/linux.git] / include / linux / mtd / flashchip.h


/*
 * struct flchip definition
 *
 * Contains information about the location and state of a given flash device
 *
 * (C) 2000 Red Hat. GPLd.
 */

#ifndef __MTD_FLASHCHIP_H__
#define __MTD_FLASHCHIP_H__

/* For spinlocks. sched.h includes spinlock.h from whichever directory it
 * happens to be in - so we don't have to care whether we're on 2.2, which
 * has asm/spinlock.h, or 2.4, which has linux/spinlock.h
 */
#include <linux/sched.h>

typedef enum {
	FL_READY,
	FL_STATUS,
	FL_CFI_QUERY,
	FL_JEDEC_QUERY,
	FL_ERASING,
	FL_ERASE_SUSPENDING,
	FL_ERASE_SUSPENDED,
	FL_WRITING,
	FL_WRITING_TO_BUFFER,
	FL_OTP_WRITE,
	FL_WRITE_SUSPENDING,
	FL_WRITE_SUSPENDED,
	FL_PM_SUSPENDED,
	FL_SYNCING,
	FL_UNLOADING,
	FL_LOCKING,
	FL_UNLOCKING,
	FL_POINT,
	FL_XIP_WHILE_ERASING,
	FL_XIP_WHILE_WRITING,
	FL_SHUTDOWN,
	FL_UNKNOWN
} flstate_t;


/* NOTE: confusingly, this can be used to refer to more than one chip at a time,
   if they're interleaved.  This can even refer to individual partitions on
   the same physical chip when present. */

struct flchip {
	unsigned long start; /* Offset within the map */
	//	unsigned long len;
	/* We omit len for now, because when we group them together
	   we insist that they're all of the same size, and the chip size
	   is held in the next level up. If we get more versatile later,
	   it'll make it a damn sight harder to find which chip we want from
	   a given offset, and we'll want to add the per-chip length field
	   back in.
	*/
	int ref_point_counter;
	flstate_t state;
	flstate_t oldstate;

	unsigned int write_suspended:1;
	unsigned int erase_suspended:1;
	unsigned long in_progress_block_addr;

	spinlock_t *mutex;
	spinlock_t _spinlock; /* We do it like this because sometimes they'll be shared. */
	wait_queue_head_t wq; /* Wait on here when we're waiting for the chip
			     to be ready */
	int word_write_time;
	int buffer_write_time;
	int erase_time;

	void *priv;
};

/* This is used to handle contention on write/erase operations
   between partitions of the same physical chip. */
struct flchip_shared {
	spinlock_t lock;
	struct flchip *writing;
	struct flchip *erasing;
};


#endif /* __MTD_FLASHCHIP_H__ */
Commit	Line	Data
1da177e4	1
61ecfa87	2	/*
1da177e4	3	* struct flchip definition
61ecfa87 TG	4	*
61ecfa87 TG	5	* Contains information about the location and state of a given flash device
1da177e4 LT	6	*
1da177e4 LT	7	* (C) 2000 Red Hat. GPLd.
1da177e4 LT	8	*/
	9
	10	#ifndef __MTD_FLASHCHIP_H__
	11	#define __MTD_FLASHCHIP_H__
	12
	13	/* For spinlocks. sched.h includes spinlock.h from whichever directory it
	14	* happens to be in - so we don't have to care whether we're on 2.2, which
61ecfa87	15	* has asm/spinlock.h, or 2.4, which has linux/spinlock.h
1da177e4 LT	16	*/
	17	#include <linux/sched.h>
	18
61ecfa87	19	typedef enum {
1da177e4 LT	20	FL_READY,
	21	FL_STATUS,
	22	FL_CFI_QUERY,
	23	FL_JEDEC_QUERY,
	24	FL_ERASING,
	25	FL_ERASE_SUSPENDING,
	26	FL_ERASE_SUSPENDED,
	27	FL_WRITING,
	28	FL_WRITING_TO_BUFFER,
f77814dd	29	FL_OTP_WRITE,
1da177e4 LT	30	FL_WRITE_SUSPENDING,
	31	FL_WRITE_SUSPENDED,
	32	FL_PM_SUSPENDED,
	33	FL_SYNCING,
	34	FL_UNLOADING,
	35	FL_LOCKING,
	36	FL_UNLOCKING,
	37	FL_POINT,
	38	FL_XIP_WHILE_ERASING,
	39	FL_XIP_WHILE_WRITING,
c4a9f88d	40	FL_SHUTDOWN,
1da177e4 LT	41	FL_UNKNOWN
	42	} flstate_t;
	43
	44
	45
61ecfa87	46	/* NOTE: confusingly, this can be used to refer to more than one chip at a time,
1da177e4 LT	47	if they're interleaved. This can even refer to individual partitions on
	48	the same physical chip when present. */
	49
	50	struct flchip {
	51	unsigned long start; /* Offset within the map */
	52	// unsigned long len;
	53	/* We omit len for now, because when we group them together
	54	we insist that they're all of the same size, and the chip size
	55	is held in the next level up. If we get more versatile later,
	56	it'll make it a damn sight harder to find which chip we want from
	57	a given offset, and we'll want to add the per-chip length field
	58	back in.
	59	*/
	60	int ref_point_counter;
	61	flstate_t state;
	62	flstate_t oldstate;
	63
0514cd93 BD	64	unsigned int write_suspended:1;
0514cd93 BD	65	unsigned int erase_suspended:1;
1da177e4 LT	66	unsigned long in_progress_block_addr;
	67
	68	spinlock_t *mutex;
	69	spinlock_t _spinlock; /* We do it like this because sometimes they'll be shared. */
	70	wait_queue_head_t wq; /* Wait on here when we're waiting for the chip
	71	to be ready */
	72	int word_write_time;
	73	int buffer_write_time;
	74	int erase_time;
	75
	76	void *priv;
	77	};
	78
	79	/* This is used to handle contention on write/erase operations
	80	between partitions of the same physical chip. */
	81	struct flchip_shared {
	82	spinlock_t lock;
	83	struct flchip *writing;
	84	struct flchip *erasing;
	85	};
	86
	87
	88	#endif /* __MTD_FLASHCHIP_H__ */