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         FL_PM_SUSPENDED,
  39 } onenand_state_t;
  40
  41 /**
  42  * struct onenand_bufferram - OneNAND BufferRAM Data
  43  * @param block         block address in BufferRAM
  44  * @param page          page address in BufferRAM
  45  * @param valid         valid flag
  46  */
  47 struct onenand_bufferram {
  48         int block;
  49         int page;
  50         int valid;
  51 };
  52
  53 /**
  54  * struct onenand_chip - OneNAND Private Flash Chip Data
  55  * @param base          [BOARDSPECIFIC] address to access OneNAND
  56  * @param chipsize      [INTERN] the size of one chip for multichip arrays
  57  * @param device_id     [INTERN] device ID
  58  * @param verstion_id   [INTERN] version ID
  59  * @param options       [BOARDSPECIFIC] various chip options. They can partly be set to inform onenand_scan about
  60  * @param erase_shift   [INTERN] number of address bits in a block
  61  * @param page_shift    [INTERN] number of address bits in a page
  62  * @param ppb_shift     [INTERN] number of address bits in a pages per block
  63  * @param page_mask     [INTERN] a page per block mask
  64  * @param bufferam_index        [INTERN] BufferRAM index
  65  * @param bufferam      [INTERN] BufferRAM info
  66  * @param readw         [REPLACEABLE] hardware specific function for read short
  67  * @param writew        [REPLACEABLE] hardware specific function for write short
  68  * @param command       [REPLACEABLE] hardware specific function for writing commands to the chip
  69  * @param wait          [REPLACEABLE] hardware specific function for wait on ready
  70  * @param read_bufferram        [REPLACEABLE] hardware specific function for BufferRAM Area
  71  * @param write_bufferram       [REPLACEABLE] hardware specific function for BufferRAM Area
  72  * @param read_word     [REPLACEABLE] hardware specific function for read register of OneNAND
  73  * @param write_word    [REPLACEABLE] hardware specific function for write register of OneNAND
  74  * @param scan_bbt      [REPLACEALBE] hardware specific function for scaning Bad block Table
  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 bbm           [REPLACEABLE] pointer to Bad Block Management
  80  * @param priv          [OPTIONAL] pointer to private chip date
  81  */
  82 struct onenand_chip {
  83         void __iomem            *base;
  84         unsigned int            chipsize;
  85         unsigned int            device_id;
  86         unsigned int            density_mask;
  87         unsigned int            options;
  88
  89         unsigned int            erase_shift;
  90         unsigned int            page_shift;
  91         unsigned int            ppb_shift;      /* Pages per block shift */
  92         unsigned int            page_mask;
  93
  94         unsigned int            bufferram_index;
  95         struct onenand_bufferram        bufferram[MAX_BUFFERRAM];
  96
  97         int (*command)(struct mtd_info *mtd, int cmd, loff_t address, size_t len);
  98         int (*wait)(struct mtd_info *mtd, int state);
  99         int (*read_bufferram)(struct mtd_info *mtd, int area,
 100                         unsigned char *buffer, int offset, size_t count);
 101         int (*write_bufferram)(struct mtd_info *mtd, int area,
 102                         const unsigned char *buffer, int offset, 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         int (*block_markbad)(struct mtd_info *mtd, loff_t ofs);
 107         int (*scan_bbt)(struct mtd_info *mtd);
 108
 109         spinlock_t              chip_lock;
 110         wait_queue_head_t       wq;
 111         onenand_state_t         state;
 112         unsigned char           *page_buf;
 113
 114         struct nand_oobinfo     *autooob;
 115
 116         void                    *bbm;
 117
 118         void                    *priv;
 119 };
 120
 121 /*
 122  * Helper macros
 123  */
 124 #define ONENAND_CURRENT_BUFFERRAM(this)         (this->bufferram_index)
 125 #define ONENAND_NEXT_BUFFERRAM(this)            (this->bufferram_index ^ 1)
 126 #define ONENAND_SET_NEXT_BUFFERRAM(this)        (this->bufferram_index ^= 1)
 127
 128 #define ONENAND_GET_SYS_CFG1(this)                                      \
 129         (this->read_word(this->base + ONENAND_REG_SYS_CFG1))
 130 #define ONENAND_SET_SYS_CFG1(v, this)                                   \
 131         (this->write_word(v, this->base + ONENAND_REG_SYS_CFG1))
 132
 133 /*
 134  * Options bits
 135  */
 136 #define ONENAND_CONT_LOCK               (0x0001)
 137 #define ONENAND_PAGEBUF_ALLOC           (0x1000)
 138
 139 /*
 140  * OneNAND Flash Manufacturer ID Codes
 141  */
 142 #define ONENAND_MFR_SAMSUNG     0xec
 143
 144 /**
 145  * struct nand_manufacturers - NAND Flash Manufacturer ID Structure
 146  * @param name:         Manufacturer name
 147  * @param id:           manufacturer ID code of device.
 148 */
 149 struct onenand_manufacturers {
 150         int id;
 151         char *name;
 152 };
 153
 154 #endif  /* __LINUX_MTD_ONENAND_H */