include/linux/mtd/flashchip.h

   1 /*
   2  * Copyright © 2000      Red Hat UK Limited
   3  * Copyright © 2000-2010 David Woodhouse <dwmw2@infradead.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  18  *
  19  */
  20
  21 #ifndef __MTD_FLASHCHIP_H__
  22 #define __MTD_FLASHCHIP_H__
  23
  24 /* For spinlocks. sched.h includes spinlock.h from whichever directory it
  25  * happens to be in - so we don't have to care whether we're on 2.2, which
  26  * has asm/spinlock.h, or 2.4, which has linux/spinlock.h
  27  */
  28 #include <linux/sched.h>
  29 #include <linux/mutex.h>
  30
  31 typedef enum {
  32         FL_READY,
  33         FL_STATUS,
  34         FL_CFI_QUERY,
  35         FL_JEDEC_QUERY,
  36         FL_ERASING,
  37         FL_ERASE_SUSPENDING,
  38         FL_ERASE_SUSPENDED,
  39         FL_WRITING,
  40         FL_WRITING_TO_BUFFER,
  41         FL_OTP_WRITE,
  42         FL_WRITE_SUSPENDING,
  43         FL_WRITE_SUSPENDED,
  44         FL_PM_SUSPENDED,
  45         FL_SYNCING,
  46         FL_UNLOADING,
  47         FL_LOCKING,
  48         FL_UNLOCKING,
  49         FL_POINT,
  50         FL_XIP_WHILE_ERASING,
  51         FL_XIP_WHILE_WRITING,
  52         FL_SHUTDOWN,
  53         /* These 2 come from nand_state_t, which has been unified here */
  54         FL_READING,
  55         FL_CACHEDPRG,
  56         /* These 4 come from onenand_state_t, which has been unified here */
  57         FL_RESETING,
  58         FL_OTPING,
  59         FL_PREPARING_ERASE,
  60         FL_VERIFYING_ERASE,
  61
  62         FL_UNKNOWN
  63 } flstate_t;
  64
  65
  66
  67 /* NOTE: confusingly, this can be used to refer to more than one chip at a time,
  68    if they're interleaved.  This can even refer to individual partitions on
  69    the same physical chip when present. */
  70
  71 struct flchip {
  72         unsigned long start; /* Offset within the map */
  73         //      unsigned long len;
  74         /* We omit len for now, because when we group them together
  75            we insist that they're all of the same size, and the chip size
  76            is held in the next level up. If we get more versatile later,
  77            it'll make it a damn sight harder to find which chip we want from
  78            a given offset, and we'll want to add the per-chip length field
  79            back in.
  80         */
  81         int ref_point_counter;
  82         flstate_t state;
  83         flstate_t oldstate;
  84
  85         unsigned int write_suspended:1;
  86         unsigned int erase_suspended:1;
  87         unsigned long in_progress_block_addr;
  88
  89         struct mutex mutex;
  90         wait_queue_head_t wq; /* Wait on here when we're waiting for the chip
  91                              to be ready */
  92         int word_write_time;
  93         int buffer_write_time;
  94         int erase_time;
  95
  96         int word_write_time_max;
  97         int buffer_write_time_max;
  98         int erase_time_max;
  99
 100         void *priv;
 101 };
 102
 103 /* This is used to handle contention on write/erase operations
 104    between partitions of the same physical chip. */
 105 struct flchip_shared {
 106         struct mutex lock;
 107         struct flchip *writing;
 108         struct flchip *erasing;
 109 };
 110
 111
 112 #endif /* __MTD_FLASHCHIP_H__ */