include/linux/mtd/onenand.h

   1 /*
   2  *  linux/include/linux/mtd/onenand.h
   3  *
   4  *  Copyright (C) 2005-2007 Samsung Electronics
   5  *  Kyungmin Park <kyungmin.park@samsung.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #ifndef __LINUX_MTD_ONENAND_H
  13 #define __LINUX_MTD_ONENAND_H
  14
  15 #include <linux/mtd/onenand_regs.h>
  16
  17 /* Note: The header order is impoertant */
  18 #include <onenand_uboot.h>
  19
  20 #include <linux/mtd/bbm.h>
  21
  22 #define MAX_BUFFERRAM           2
  23 #define MAX_ONENAND_PAGESIZE    (2048 + 64)
  24
  25 /* Scan and identify a OneNAND device */
  26 extern int onenand_scan (struct mtd_info *mtd, int max_chips);
  27 /* Free resources held by the OneNAND device */
  28 extern void onenand_release (struct mtd_info *mtd);
  29
  30 /**
  31  * onenand_state_t - chip states
  32  * Enumeration for OneNAND flash chip state
  33  */
  34 typedef enum {
  35         FL_READY,
  36         FL_READING,
  37         FL_WRITING,
  38         FL_ERASING,
  39         FL_SYNCING,
  40         FL_UNLOCKING,
  41         FL_LOCKING,
  42 } onenand_state_t;
  43
  44 /**
  45  * struct onenand_bufferram - OneNAND BufferRAM Data
  46  * @param block         block address in BufferRAM
  47  * @param page          page address in BufferRAM
  48  * @param valid         valid flag
  49  */
  50 struct onenand_bufferram {
  51         int block;
  52         int page;
  53         int valid;
  54 };
  55
  56 /**
  57  * struct onenand_chip - OneNAND Private Flash Chip Data
  58  * @param base          [BOARDSPECIFIC] address to access OneNAND
  59  * @param chipsize      [INTERN] the size of one chip for multichip arrays
  60  * @param device_id     [INTERN] device ID
  61  * @param verstion_id   [INTERN] version ID
  62  * @param options       [BOARDSPECIFIC] various chip options. They can partly be set to inform onenand_scan about
  63  * @param erase_shift   [INTERN] number of address bits in a block
  64  * @param page_shift    [INTERN] number of address bits in a page
  65  * @param ppb_shift     [INTERN] number of address bits in a pages per block
  66  * @param page_mask     [INTERN] a page per block mask
  67  * @param bufferam_index        [INTERN] BufferRAM index
  68  * @param bufferam      [INTERN] BufferRAM info
  69  * @param readw         [REPLACEABLE] hardware specific function for read short
  70  * @param writew        [REPLACEABLE] hardware specific function for write short
  71  * @param command       [REPLACEABLE] hardware specific function for writing commands to the chip
  72  * @param wait          [REPLACEABLE] hardware specific function for wait on ready
  73  * @param read_bufferram        [REPLACEABLE] hardware specific function for BufferRAM Area
  74  * @param write_bufferram       [REPLACEABLE] hardware specific function for BufferRAM Area
  75  * @param chip_lock     [INTERN] spinlock used to protect access to this structure and the chip
  76  * @param wq            [INTERN] wait queue to sleep on if a OneNAND operation is in progress
  77  * @param state         [INTERN] the current state of the OneNAND device
  78  * @param autooob       [REPLACEABLE] the default (auto)placement scheme
  79  * @param priv          [OPTIONAL] pointer to private chip date
  80  */
  81 struct onenand_chip {
  82         void __iomem *base;
  83         unsigned int chipsize;
  84         unsigned int device_id;
  85         unsigned int options;
  86
  87         unsigned int erase_shift;
  88         unsigned int page_shift;
  89         unsigned int ppb_shift; /* Pages per block shift */
  90         unsigned int page_mask;
  91
  92         unsigned int bufferram_index;
  93         struct onenand_bufferram bufferram[MAX_BUFFERRAM];
  94
  95         int (*command) (struct mtd_info * mtd, int cmd, loff_t address,
  96                         size_t len);
  97         int (*wait) (struct mtd_info * mtd, int state);
  98         int (*read_bufferram) (struct mtd_info * mtd, int area,
  99                                unsigned char *buffer, int offset, size_t count);
 100         int (*write_bufferram) (struct mtd_info * mtd, int area,
 101                                 const unsigned char *buffer, int offset,
 102                                 size_t count);
 103         unsigned short (*read_word) (void __iomem * addr);
 104         void (*write_word) (unsigned short value, void __iomem * addr);
 105         void (*mmcontrol) (struct mtd_info * mtd, int sync_read);
 106
 107         spinlock_t chip_lock;
 108         wait_queue_head_t wq;
 109         onenand_state_t state;
 110
 111         struct nand_oobinfo *autooob;
 112
 113         void *bbm;
 114
 115         void *priv;
 116 };
 117
 118 #define ONENAND_CURRENT_BUFFERRAM(this)         (this->bufferram_index)
 119 #define ONENAND_NEXT_BUFFERRAM(this)            (this->bufferram_index ^ 1)
 120 #define ONENAND_SET_NEXT_BUFFERRAM(this)        (this->bufferram_index ^= 1)
 121
 122 /*
 123  * Options bits
 124  */
 125 #define ONENAND_CONT_LOCK               (0x0001)
 126
 127 /*
 128  * OneNAND Flash Manufacturer ID Codes
 129  */
 130 #define ONENAND_MFR_SAMSUNG     0xec
 131 #define ONENAND_MFR_UNKNOWN     0x00
 132
 133 /**
 134  * struct nand_manufacturers - NAND Flash Manufacturer ID Structure
 135  * @param name:         Manufacturer name
 136  * @param id:           manufacturer ID code of device.
 137 */
 138 struct onenand_manufacturers {
 139         int id;
 140         char *name;
 141 };
 142
 143 #endif                          /* __LINUX_MTD_ONENAND_H */