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  * @blockpage:          block & page address in BufferRAM
  46  */
  47 struct onenand_bufferram {
  48         int     blockpage;
  49 };
  50
  51 /**
  52  * struct onenand_chip - OneNAND Private Flash Chip Data
  53  * @base:               [BOARDSPECIFIC] address to access OneNAND
  54  * @chipsize:           [INTERN] the size of one chip for multichip arrays
  55  * @device_id:          [INTERN] device ID
  56  * @density_mask:       chip density, used for DDP devices
  57  * @verstion_id:        [INTERN] version ID
  58  * @options:            [BOARDSPECIFIC] various chip options. They can
  59  *                      partly be set to inform onenand_scan about
  60  * @erase_shift:        [INTERN] number of address bits in a block
  61  * @page_shift:         [INTERN] number of address bits in a page
  62  * @page_mask:          [INTERN] a page per block mask
  63  * @bufferram_index:    [INTERN] BufferRAM index
  64  * @bufferram:          [INTERN] BufferRAM info
  65  * @readw:              [REPLACEABLE] hardware specific function for read short
  66  * @writew:             [REPLACEABLE] hardware specific function for write short
  67  * @command:            [REPLACEABLE] hardware specific function for writing
  68  *                      commands to the chip
  69  * @wait:               [REPLACEABLE] hardware specific function for wait on ready
  70  * @read_bufferram:     [REPLACEABLE] hardware specific function for BufferRAM Area
  71  * @write_bufferram:    [REPLACEABLE] hardware specific function for BufferRAM Area
  72  * @read_word:          [REPLACEABLE] hardware specific function for read
  73  *                      register of OneNAND
  74  * @write_word:         [REPLACEABLE] hardware specific function for write
  75  *                      register of OneNAND
  76  * @mmcontrol:          sync burst read function
  77  * @block_markbad:      function to mark a block as bad
  78  * @scan_bbt:           [REPLACEALBE] hardware specific function for scanning
  79  *                      Bad block Table
  80  * @chip_lock:          [INTERN] spinlock used to protect access to this
  81  *                      structure and the chip
  82  * @wq:                 [INTERN] wait queue to sleep on if a OneNAND
  83  *                      operation is in progress
  84  * @state:              [INTERN] the current state of the OneNAND device
  85  * @page_buf:           [INTERN] page main data buffer
  86  * @oob_buf:            [INTERN] page oob data buffer
  87  * @subpagesize:        [INTERN] holds the subpagesize
  88  * @ecclayout:          [REPLACEABLE] the default ecc placement scheme
  89  * @bbm:                [REPLACEABLE] pointer to Bad Block Management
  90  * @priv:               [OPTIONAL] pointer to private chip date
  91  */
  92 struct onenand_chip {
  93         void __iomem            *base;
  94         unsigned int            chipsize;
  95         unsigned int            device_id;
  96         unsigned int            version_id;
  97         unsigned int            density_mask;
  98         unsigned int            options;
  99
 100         unsigned int            erase_shift;
 101         unsigned int            page_shift;
 102         unsigned int            page_mask;
 103
 104         unsigned int            bufferram_index;
 105         struct onenand_bufferram        bufferram[MAX_BUFFERRAM];
 106
 107         int (*command)(struct mtd_info *mtd, int cmd, loff_t address, size_t len);
 108         int (*wait)(struct mtd_info *mtd, int state);
 109         int (*read_bufferram)(struct mtd_info *mtd, int area,
 110                         unsigned char *buffer, int offset, size_t count);
 111         int (*write_bufferram)(struct mtd_info *mtd, int area,
 112                         const unsigned char *buffer, int offset, size_t count);
 113         unsigned short (*read_word)(void __iomem *addr);
 114         void (*write_word)(unsigned short value, void __iomem *addr);
 115         void (*mmcontrol)(struct mtd_info *mtd, int sync_read);
 116         int (*block_markbad)(struct mtd_info *mtd, loff_t ofs);
 117         int (*scan_bbt)(struct mtd_info *mtd);
 118
 119         struct completion       complete;
 120         int                     irq;
 121
 122         spinlock_t              chip_lock;
 123         wait_queue_head_t       wq;
 124         onenand_state_t         state;
 125         unsigned char           *page_buf;
 126         unsigned char           *oob_buf;
 127
 128         int                     subpagesize;
 129         struct nand_ecclayout   *ecclayout;
 130
 131         void                    *bbm;
 132
 133         void                    *priv;
 134 };
 135
 136 /*
 137  * Helper macros
 138  */
 139 #define ONENAND_CURRENT_BUFFERRAM(this)         (this->bufferram_index)
 140 #define ONENAND_NEXT_BUFFERRAM(this)            (this->bufferram_index ^ 1)
 141 #define ONENAND_SET_NEXT_BUFFERRAM(this)        (this->bufferram_index ^= 1)
 142 #define ONENAND_SET_PREV_BUFFERRAM(this)        (this->bufferram_index ^= 1)
 143
 144 #define ONENAND_GET_SYS_CFG1(this)                                      \
 145         (this->read_word(this->base + ONENAND_REG_SYS_CFG1))
 146 #define ONENAND_SET_SYS_CFG1(v, this)                                   \
 147         (this->write_word(v, this->base + ONENAND_REG_SYS_CFG1))
 148
 149 #define ONENAND_IS_DDP(this)                                            \
 150         (this->device_id & ONENAND_DEVICE_IS_DDP)
 151
 152 /* Check byte access in OneNAND */
 153 #define ONENAND_CHECK_BYTE_ACCESS(addr)         (addr & 0x1)
 154
 155 /*
 156  * Options bits
 157  */
 158 #define ONENAND_HAS_CONT_LOCK           (0x0001)
 159 #define ONENAND_HAS_UNLOCK_ALL          (0x0002)
 160 #define ONENAND_PAGEBUF_ALLOC           (0x1000)
 161 #define ONENAND_OOBBUF_ALLOC            (0x2000)
 162
 163 /*
 164  * OneNAND Flash Manufacturer ID Codes
 165  */
 166 #define ONENAND_MFR_SAMSUNG     0xec
 167
 168 /**
 169  * struct onenand_manufacturers - NAND Flash Manufacturer ID Structure
 170  * @name:       Manufacturer name
 171  * @id:         manufacturer ID code of device.
 172 */
 173 struct onenand_manufacturers {
 174         int id;
 175         char *name;
 176 };
 177
 178 #endif  /* __LINUX_MTD_ONENAND_H */