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/mtd/onenand_regs.h> 16 17 /* Note: The header order is impoertant */ 18 #include <onenand_uboot.h> 19 20 #include <linux/mtd/compat.h> 21 #include <linux/mtd/bbm.h> 22 23 #define MAX_BUFFERRAM 2 24 #define MAX_ONENAND_PAGESIZE (2048 + 64) 25 26 /* Scan and identify a OneNAND device */ 27 extern int onenand_scan (struct mtd_info *mtd, int max_chips); 28 /* Free resources held by the OneNAND device */ 29 extern void onenand_release (struct mtd_info *mtd); 30 31 /** 32 * struct onenand_bufferram - OneNAND BufferRAM Data 33 * @param block block address in BufferRAM 34 * @param page page address in BufferRAM 35 * @param valid valid flag 36 */ 37 struct onenand_bufferram { 38 int block; 39 int page; 40 int valid; 41 }; 42 43 /** 44 * struct onenand_chip - OneNAND Private Flash Chip Data 45 * @param base [BOARDSPECIFIC] address to access OneNAND 46 * @param chipsize [INTERN] the size of one chip for multichip arrays 47 * @param device_id [INTERN] device ID 48 * @param verstion_id [INTERN] version ID 49 * @param options [BOARDSPECIFIC] various chip options. They can partly be set to inform onenand_scan about 50 * @param erase_shift [INTERN] number of address bits in a block 51 * @param page_shift [INTERN] number of address bits in a page 52 * @param ppb_shift [INTERN] number of address bits in a pages per block 53 * @param page_mask [INTERN] a page per block mask 54 * @param bufferam_index [INTERN] BufferRAM index 55 * @param bufferam [INTERN] BufferRAM info 56 * @param readw [REPLACEABLE] hardware specific function for read short 57 * @param writew [REPLACEABLE] hardware specific function for write short 58 * @param command [REPLACEABLE] hardware specific function for writing commands to the chip 59 * @param wait [REPLACEABLE] hardware specific function for wait on ready 60 * @param read_bufferram [REPLACEABLE] hardware specific function for BufferRAM Area 61 * @param write_bufferram [REPLACEABLE] hardware specific function for BufferRAM Area 62 * @param chip_lock [INTERN] spinlock used to protect access to this structure and the chip 63 * @param wq [INTERN] wait queue to sleep on if a OneNAND operation is in progress 64 * @param state [INTERN] the current state of the OneNAND device 65 * @param autooob [REPLACEABLE] the default (auto)placement scheme 66 * @param priv [OPTIONAL] pointer to private chip date 67 */ 68 struct onenand_chip { 69 void __iomem *base; 70 unsigned int chipsize; 71 unsigned int device_id; 72 unsigned int options; 73 74 unsigned int erase_shift; 75 unsigned int page_shift; 76 unsigned int ppb_shift; /* Pages per block shift */ 77 unsigned int page_mask; 78 unsigned int writesize; 79 80 unsigned int bufferram_index; 81 struct onenand_bufferram bufferram[MAX_BUFFERRAM]; 82 83 int (*command) (struct mtd_info * mtd, int cmd, loff_t address, 84 size_t len); 85 int (*wait) (struct mtd_info * mtd, int state); 86 int (*read_bufferram) (struct mtd_info * mtd, int area, 87 unsigned char *buffer, int offset, size_t count); 88 int (*write_bufferram) (struct mtd_info * mtd, int area, 89 const unsigned char *buffer, int offset, 90 size_t count); 91 unsigned short (*read_word) (void __iomem * addr); 92 void (*write_word) (unsigned short value, void __iomem * addr); 93 void (*mmcontrol) (struct mtd_info * mtd, int sync_read); 94 int (*block_markbad)(struct mtd_info *mtd, loff_t ofs); 95 int (*scan_bbt)(struct mtd_info *mtd); 96 97 int state; 98 unsigned char *page_buf; 99 unsigned char *oob_buf; 100 101 struct nand_oobinfo *autooob; 102 struct nand_ecclayout *ecclayout; 103 104 void *bbm; 105 106 void *priv; 107 }; 108 109 /* 110 * Helper macros 111 */ 112 #define ONENAND_CURRENT_BUFFERRAM(this) (this->bufferram_index) 113 #define ONENAND_NEXT_BUFFERRAM(this) (this->bufferram_index ^ 1) 114 #define ONENAND_SET_NEXT_BUFFERRAM(this) (this->bufferram_index ^= 1) 115 #define ONENAND_SET_PREV_BUFFERRAM(this) (this->bufferram_index ^= 1) 116 #define ONENAND_SET_BUFFERRAM0(this) (this->bufferram_index = 0) 117 #define ONENAND_SET_BUFFERRAM1(this) (this->bufferram_index = 1) 118 119 #define ONENAND_IS_DDP(this) \ 120 (this->device_id & ONENAND_DEVICE_IS_DDP) 121 122 #define ONENAND_IS_2PLANE(this) (0) 123 124 /* 125 * Options bits 126 */ 127 #define ONENAND_CONT_LOCK (0x0001) 128 #define ONENAND_PAGEBUF_ALLOC (0x1000) 129 #define ONENAND_OOBBUF_ALLOC (0x2000) 130 131 /* 132 * OneNAND Flash Manufacturer ID Codes 133 */ 134 #define ONENAND_MFR_SAMSUNG 0xec 135 #define ONENAND_MFR_UNKNOWN 0x00 136 137 /** 138 * struct nand_manufacturers - NAND Flash Manufacturer ID Structure 139 * @param name: Manufacturer name 140 * @param id: manufacturer ID code of device. 141 */ 142 struct onenand_manufacturers { 143 int id; 144 char *name; 145 }; 146 147 int onenand_bbt_read_oob(struct mtd_info *mtd, loff_t from, 148 struct mtd_oob_ops *ops); 149 150 #endif /* __LINUX_MTD_ONENAND_H */ 151