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 */ 23extern int onenand_scan(struct mtd_info *mtd, int max_chips); 24/* Free resources held by the OneNAND device */ 25extern void onenand_release(struct mtd_info *mtd); 26 27/* 28 * onenand_state_t - chip states 29 * Enumeration for OneNAND flash chip state 30 */ 31typedef 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 */ 47struct 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 */ 92struct 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*/ 173struct onenand_manufacturers { 174 int id; 175 char *name; 176}; 177 178#endif /* __LINUX_MTD_ONENAND_H */ 179