flashchip.h
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上传日期:2009-04-28
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- /*
- * struct flchip definition
- *
- * Contains information about the location and state of a given flash device
- *
- * (C) 2000 Red Hat. GPLd.
- *
- * $Id: flashchip.h,v 1.17 2005/03/14 18:27:15 bjd Exp $
- *
- */
- #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_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__ */