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/spinlock.h>
  16 #include <linux/completion.h>
  17 #include <linux/mtd/onenand_regs.h>
  18 #include <linux/mtd/bbm.h>
  19
  20 #define MAX_BUFFERRAM           2
  21
  22 /* Scan and identify a OneNAND device */
  23 extern int onenand_scan(struct mtd_info *mtd, int max_chips);
  24 /* Free resources held by the OneNAND device */
  25 extern void onenand_release(struct mtd_info *mtd);
  26
  27 /*
  28  * onenand_state_t - chip states
  29  * Enumeration for OneNAND flash chip state
  30  */
  31 typedef enum {
  32         FL_READY,
  33         FL_READING,
  34         FL_WRITING,
  35         FL_ERASING,
  36         FL_SYNCING,
  37         FL_LOCKING,
  38         FL_RESETING,
  39         FL_OTPING,
  40         FL_PM_SUSPENDED,
  41 } onenand_state_t;
  42
  43 /**
  44  * struct onenand_bufferram - OneNAND BufferRAM Data
  45  * @block:              block address in BufferRAM
  46  * @page:               page address in BufferRAM
  47  * @valid:              valid flag
  48  */
  49 struct onenand_bufferram {
  50         int block;
  51         int page;
  52         int valid;
  53 };
  54
  55 /**
  56  * struct onenand_chip - OneNAND Private Flash Chip Data
  57  * @base:               [BOARDSPECIFIC] address to access OneNAND
  58  * @chipsize:           [INTERN] the size of one chip for multichip arrays
  59  * @device_id:          [INTERN] device ID
  60  * @density_mask:       chip density, used for DDP devices
  61  * @verstion_id:        [INTERN] version ID
  62  * @options:            [BOARDSPECIFIC] various chip options. They can
  63  *                      partly be set to inform onenand_scan about
  64  * @erase_shift:        [INTERN] number of address bits in a block
  65  * @page_shift:         [INTERN] number of address bits in a page
  66  * @page_mask:          [INTERN] a page per block mask
  67  * @bufferram_index:    [INTERN] BufferRAM index
  68  * @bufferram:          [INTERN] BufferRAM info
  69  * @readw:              [REPLACEABLE] hardware specific function for read short
  70  * @writew:             [REPLACEABLE] hardware specific function for write short
  71  * @command:            [REPLACEABLE] hardware specific function for writing
  72  *                      commands to the chip
  73  * @wait:               [REPLACEABLE] hardware specific function for wait on ready
  74  * @read_bufferram:     [REPLACEABLE] hardware specific function for BufferRAM Area
  75  * @write_bufferram:    [REPLACEABLE] hardware specific function for BufferRAM Area
  76  * @read_word:          [REPLACEABLE] hardware specific function for read
  77  *                      register of OneNAND
  78  * @write_word:         [REPLACEABLE] hardware specific function for write
  79  *                      register of OneNAND
  80  * @mmcontrol:          sync burst read function
  81  * @block_markbad:      function to mark a block as bad
  82  * @scan_bbt:           [REPLACEALBE] hardware specific function for scanning
  83  *                      Bad block Table
  84  * @chip_lock:          [INTERN] spinlock used to protect access to this
  85  *                      structure and the chip
  86  * @wq:                 [INTERN] wait queue to sleep on if a OneNAND
  87  *                      operation is in progress
  88  * @state:              [INTERN] the current state of the OneNAND device
  89  * @page_buf:           data buffer
  90  * @subpagesize:        [INTERN] holds the subpagesize
  91  * @ecclayout:          [REPLACEABLE] the default ecc placement scheme
  92  * @bbm:                [REPLACEABLE] pointer to Bad Block Management
  93  * @priv:               [OPTIONAL] pointer to private chip date
  94  */
  95 struct onenand_chip {
  96         void __iomem            *base;
  97         unsigned int            chipsize;
  98         unsigned int            device_id;
  99         unsigned int            version_id;
 100         unsigned int            density_mask;
 101         unsigned int            options;
 102
 103         unsigned int            erase_shift;
 104         unsigned int            page_shift;
 105         unsigned int            page_mask;
 106
 107         unsigned int            bufferram_index;
 108         struct onenand_bufferram        bufferram[MAX_BUFFERRAM];
 109
 110         int (*command)(struct mtd_info *mtd, int cmd, loff_t address, size_t len);
 111         int (*wait)(struct mtd_info *mtd, int state);
 112         int (*read_bufferram)(struct mtd_info *mtd, int area,
 113                         unsigned char *buffer, int offset, size_t count);
 114         int (*write_bufferram)(struct mtd_info *mtd, int area,
 115                         const unsigned char *buffer, int offset, size_t count);
 116         unsigned short (*read_word)(void __iomem *addr);
 117         void (*write_word)(unsigned short value, void __iomem *addr);
 118         void (*mmcontrol)(struct mtd_info *mtd, int sync_read);
 119         int (*block_markbad)(struct mtd_info *mtd, loff_t ofs);
 120         int (*scan_bbt)(struct mtd_info *mtd);
 121
 122         struct completion       complete;
 123         int                     irq;
 124
 125         spinlock_t              chip_lock;
 126         wait_queue_head_t       wq;
 127         onenand_state_t         state;
 128         unsigned char           *page_buf;
 129
 130         int                     subpagesize;
 131         struct nand_ecclayout   *ecclayout;
 132
 133         void                    *bbm;
 134
 135         void                    *priv;
 136 };
 137
 138 /*
 139  * Helper macros
 140  */
 141 #define ONENAND_CURRENT_BUFFERRAM(this)         (this->bufferram_index)
 142 #define ONENAND_NEXT_BUFFERRAM(this)            (this->bufferram_index ^ 1)
 143 #define ONENAND_SET_NEXT_BUFFERRAM(this)        (this->bufferram_index ^= 1)
 144 #define ONENAND_SET_PREV_BUFFERRAM(this)        (this->bufferram_index ^= 1)
 145
 146 #define ONENAND_GET_SYS_CFG1(this)                                      \
 147         (this->read_word(this->base + ONENAND_REG_SYS_CFG1))
 148 #define ONENAND_SET_SYS_CFG1(v, this)                                   \
 149         (this->write_word(v, this->base + ONENAND_REG_SYS_CFG1))
 150
 151 #define ONENAND_IS_DDP(this)                                            \
 152         (this->device_id & ONENAND_DEVICE_IS_DDP)
 153
 154 /* Check byte access in OneNAND */
 155 #define ONENAND_CHECK_BYTE_ACCESS(addr)         (addr & 0x1)
 156
 157 /*
 158  * Options bits
 159  */
 160 #define ONENAND_HAS_CONT_LOCK           (0x0001)
 161 #define ONENAND_HAS_UNLOCK_ALL          (0x0002)
 162 #define ONENAND_PAGEBUF_ALLOC           (0x1000)
 163
 164 /*
 165  * OneNAND Flash Manufacturer ID Codes
 166  */
 167 #define ONENAND_MFR_SAMSUNG     0xec
 168
 169 /**
 170  * struct onenand_manufacturers - NAND Flash Manufacturer ID Structure
 171  * @name:       Manufacturer name
 172  * @id:         manufacturer ID code of device.
 173 */
 174 struct onenand_manufacturers {
 175         int id;
 176         char *name;
 177 };
 178
 179 #endif  /* __LINUX_MTD_ONENAND_H */