include/linux/mtd/flashchip.h

   1
   2 /*
   3  * struct flchip definition
   4  *
   5  * Contains information about the location and state of a given flash device
   6  *
   7  * (C) 2000 Red Hat. GPLd.
   8  *
   9  * $Id: flashchip.h,v 1.17 2005/03/14 18:27:15 bjd Exp $
  10  *
  11  */
  12
  13 #ifndef __MTD_FLASHCHIP_H__
  14 #define __MTD_FLASHCHIP_H__
  15
  16 /* For spinlocks. sched.h includes spinlock.h from whichever directory it
  17  * happens to be in - so we don't have to care whether we're on 2.2, which
  18  * has asm/spinlock.h, or 2.4, which has linux/spinlock.h
  19  */
  20 #include <linux/sched.h>
  21
  22 typedef enum {
  23         FL_READY,
  24         FL_STATUS,
  25         FL_CFI_QUERY,
  26         FL_JEDEC_QUERY,
  27         FL_ERASING,
  28         FL_ERASE_SUSPENDING,
  29         FL_ERASE_SUSPENDED,
  30         FL_WRITING,
  31         FL_WRITING_TO_BUFFER,
  32         FL_OTP_WRITE,
  33         FL_WRITE_SUSPENDING,
  34         FL_WRITE_SUSPENDED,
  35         FL_PM_SUSPENDED,
  36         FL_SYNCING,
  37         FL_UNLOADING,
  38         FL_LOCKING,
  39         FL_UNLOCKING,
  40         FL_POINT,
  41         FL_XIP_WHILE_ERASING,
  42         FL_XIP_WHILE_WRITING,
  43         FL_UNKNOWN
  44 } flstate_t;
  45
  46
  47
  48 /* NOTE: confusingly, this can be used to refer to more than one chip at a time,
  49    if they're interleaved.  This can even refer to individual partitions on
  50    the same physical chip when present. */
  51
  52 struct flchip {
  53         unsigned long start; /* Offset within the map */
  54         //      unsigned long len;
  55         /* We omit len for now, because when we group them together
  56            we insist that they're all of the same size, and the chip size
  57            is held in the next level up. If we get more versatile later,
  58            it'll make it a damn sight harder to find which chip we want from
  59            a given offset, and we'll want to add the per-chip length field
  60            back in.
  61         */
  62         int ref_point_counter;
  63         flstate_t state;
  64         flstate_t oldstate;
  65
  66         unsigned int write_suspended:1;
  67         unsigned int erase_suspended:1;
  68         unsigned long in_progress_block_addr;
  69
  70         spinlock_t *mutex;
  71         spinlock_t _spinlock; /* We do it like this because sometimes they'll be shared. */
  72         wait_queue_head_t wq; /* Wait on here when we're waiting for the chip
  73                              to be ready */
  74         int word_write_time;
  75         int buffer_write_time;
  76         int erase_time;
  77
  78         void *priv;
  79 };
  80
  81 /* This is used to handle contention on write/erase operations
  82    between partitions of the same physical chip. */
  83 struct flchip_shared {
  84         spinlock_t lock;
  85         struct flchip *writing;
  86         struct flchip *erasing;
  87 };
  88
  89
  90 #endif /* __MTD_FLASHCHIP_H__ */