include/linux/mtd/onenand.h

   1 /*
   2  *  linux/include/linux/mtd/onenand.h
   3  *
   4  *  Copyright (C) 2005 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/spinlock.h>
  16 #include <linux/mtd/onenand_regs.h>
  17 #include <linux/mtd/bbm.h>
  18
  19 #define MAX_BUFFERRAM           2
  20
  21 /* Scan and identify a OneNAND device */
  22 extern int onenand_scan(struct mtd_info *mtd, int max_chips);
  23 /* Free resources held by the OneNAND device */
  24 extern void onenand_release(struct mtd_info *mtd);
  25
  26 /**
  27  * onenand_state_t - chip states
  28  * Enumeration for OneNAND flash chip state
  29  */
  30 typedef enum {
  31         FL_READY,
  32         FL_READING,
  33         FL_WRITING,
  34         FL_ERASING,
  35         FL_SYNCING,
  36         FL_UNLOCKING,
  37         FL_LOCKING,
  38 } onenand_state_t;
  39
  40 /**
  41  * struct onenand_bufferram - OneNAND BufferRAM Data
  42  * @param block         block address in BufferRAM
  43  * @param page          page address in BufferRAM
  44  * @param valid         valid flag
  45  */
  46 struct onenand_bufferram {
  47         int block;
  48         int page;
  49         int valid;
  50 };
  51
  52 /**
  53  * struct onenand_chip - OneNAND Private Flash Chip Data
  54  * @param base          [BOARDSPECIFIC] address to access OneNAND
  55  * @param chipsize      [INTERN] the size of one chip for multichip arrays
  56  * @param device_id     [INTERN] device ID
  57  * @param verstion_id   [INTERN] version ID
  58  * @param options       [BOARDSPECIFIC] various chip options. They can partly be set to inform onenand_scan about
  59  * @param erase_shift   [INTERN] number of address bits in a block
  60  * @param page_shift    [INTERN] number of address bits in a page
  61  * @param ppb_shift     [INTERN] number of address bits in a pages per block
  62  * @param page_mask     [INTERN] a page per block mask
  63  * @param bufferam_index        [INTERN] BufferRAM index
  64  * @param bufferam      [INTERN] BufferRAM info
  65  * @param readw         [REPLACEABLE] hardware specific function for read short
  66  * @param writew        [REPLACEABLE] hardware specific function for write short
  67  * @param command       [REPLACEABLE] hardware specific function for writing commands to the chip
  68  * @param wait          [REPLACEABLE] hardware specific function for wait on ready
  69  * @param read_bufferram        [REPLACEABLE] hardware specific function for BufferRAM Area
  70  * @param write_bufferram       [REPLACEABLE] hardware specific function for BufferRAM Area
  71  * @param read_word     [REPLACEABLE] hardware specific function for read register of OneNAND
  72  * @param write_word    [REPLACEABLE] hardware specific function for write register of OneNAND
  73  * @param scan_bbt      [REPLACEALBE] hardware specific function for scaning Bad block Table
  74  * @param chip_lock     [INTERN] spinlock used to protect access to this structure and the chip
  75  * @param wq            [INTERN] wait queue to sleep on if a OneNAND operation is in progress
  76  * @param state         [INTERN] the current state of the OneNAND device
  77  * @param autooob       [REPLACEABLE] the default (auto)placement scheme
  78  * @param bbm           [REPLACEABLE] pointer to Bad Block Management
  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, size_t len);
  96         int (*wait)(struct mtd_info *mtd, int state);
  97         int (*read_bufferram)(struct mtd_info *mtd, int area,
  98                         unsigned char *buffer, int offset, size_t count);
  99         int (*write_bufferram)(struct mtd_info *mtd, int area,
 100                         const unsigned char *buffer, int offset, size_t count);
 101         unsigned short (*read_word)(void __iomem *addr);
 102         void (*write_word)(unsigned short value, void __iomem *addr);
 103         void (*mmcontrol)(struct mtd_info *mtd, int sync_read);
 104         int (*block_markbad)(struct mtd_info *mtd, loff_t ofs);
 105         int (*scan_bbt)(struct mtd_info *mtd);
 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 /*
 119  * Helper macros
 120  */
 121 #define ONENAND_CURRENT_BUFFERRAM(this)         (this->bufferram_index)
 122 #define ONENAND_NEXT_BUFFERRAM(this)            (this->bufferram_index ^ 1)
 123 #define ONENAND_SET_NEXT_BUFFERRAM(this)        (this->bufferram_index ^= 1)
 124
 125 #define ONENAND_GET_SYS_CFG1(this)                                      \
 126         (this->read_word(this->base + ONENAND_REG_SYS_CFG1))
 127 #define ONENAND_SET_SYS_CFG1(v, this)                                   \
 128         (this->write_word(v, this->base + ONENAND_REG_SYS_CFG1))
 129
 130 /*
 131  * Options bits
 132  */
 133 #define ONENAND_CONT_LOCK               (0x0001)
 134
 135
 136 /*
 137  * OneNAND Flash Manufacturer ID Codes
 138  */
 139 #define ONENAND_MFR_SAMSUNG     0xec
 140 #define ONENAND_MFR_UNKNOWN     0x00
 141
 142 /**
 143  * struct nand_manufacturers - NAND Flash Manufacturer ID Structure
 144  * @param name:         Manufacturer name
 145  * @param id:           manufacturer ID code of device.
 146 */
 147 struct onenand_manufacturers {
 148         int id;
 149         char *name;
 150 };
 151
 152 #endif  /* __LINUX_MTD_ONENAND_H */