2 * linux/include/linux/mtd/onenand.h
4 * Copyright (C) 2005 Samsung Electronics
5 * Kyungmin Park <kyungmin.park@samsung.com>
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.
12 #ifndef __LINUX_MTD_ONENAND_H
13 #define __LINUX_MTD_ONENAND_H
15 #include <linux/spinlock.h>
16 #include <linux/mtd/onenand_regs.h>
17 #include <linux/mtd/bbm.h>
19 #define MAX_BUFFERRAM 2
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
);
27 * onenand_state_t - chip states
28 * Enumeration for OneNAND flash chip state
44 * struct onenand_bufferram - OneNAND BufferRAM Data
45 * @param block block address in BufferRAM
46 * @param page page address in BufferRAM
47 * @param valid valid flag
49 struct onenand_bufferram
{
56 * struct onenand_chip - OneNAND Private Flash Chip Data
57 * @param base [BOARDSPECIFIC] address to access OneNAND
58 * @param chipsize [INTERN] the size of one chip for multichip arrays
59 * @param device_id [INTERN] device ID
60 * @param verstion_id [INTERN] version ID
61 * @param options [BOARDSPECIFIC] various chip options. They can partly be set to inform onenand_scan about
62 * @param erase_shift [INTERN] number of address bits in a block
63 * @param page_shift [INTERN] number of address bits in a page
64 * @param ppb_shift [INTERN] number of address bits in a pages per block
65 * @param page_mask [INTERN] a page per block mask
66 * @param bufferam_index [INTERN] BufferRAM index
67 * @param bufferam [INTERN] BufferRAM info
68 * @param readw [REPLACEABLE] hardware specific function for read short
69 * @param writew [REPLACEABLE] hardware specific function for write short
70 * @param command [REPLACEABLE] hardware specific function for writing commands to the chip
71 * @param wait [REPLACEABLE] hardware specific function for wait on ready
72 * @param read_bufferram [REPLACEABLE] hardware specific function for BufferRAM Area
73 * @param write_bufferram [REPLACEABLE] hardware specific function for BufferRAM Area
74 * @param read_word [REPLACEABLE] hardware specific function for read register of OneNAND
75 * @param write_word [REPLACEABLE] hardware specific function for write register of OneNAND
76 * @param scan_bbt [REPLACEALBE] hardware specific function for scaning Bad block Table
77 * @param chip_lock [INTERN] spinlock used to protect access to this structure and the chip
78 * @param wq [INTERN] wait queue to sleep on if a OneNAND operation is in progress
79 * @param state [INTERN] the current state of the OneNAND device
80 * @param autooob [REPLACEABLE] the default (auto)placement scheme
81 * @param bbm [REPLACEABLE] pointer to Bad Block Management
82 * @param priv [OPTIONAL] pointer to private chip date
86 unsigned int chipsize
;
87 unsigned int device_id
;
88 unsigned int density_mask
;
91 unsigned int erase_shift
;
92 unsigned int page_shift
;
93 unsigned int ppb_shift
; /* Pages per block shift */
94 unsigned int page_mask
;
96 unsigned int bufferram_index
;
97 struct onenand_bufferram bufferram
[MAX_BUFFERRAM
];
99 int (*command
)(struct mtd_info
*mtd
, int cmd
, loff_t address
, size_t len
);
100 int (*wait
)(struct mtd_info
*mtd
, int state
);
101 int (*read_bufferram
)(struct mtd_info
*mtd
, int area
,
102 unsigned char *buffer
, int offset
, size_t count
);
103 int (*write_bufferram
)(struct mtd_info
*mtd
, int area
,
104 const unsigned char *buffer
, int offset
, size_t count
);
105 unsigned short (*read_word
)(void __iomem
*addr
);
106 void (*write_word
)(unsigned short value
, void __iomem
*addr
);
107 void (*mmcontrol
)(struct mtd_info
*mtd
, int sync_read
);
108 int (*block_markbad
)(struct mtd_info
*mtd
, loff_t ofs
);
109 int (*scan_bbt
)(struct mtd_info
*mtd
);
111 spinlock_t chip_lock
;
112 wait_queue_head_t wq
;
113 onenand_state_t state
;
114 unsigned char *page_buf
;
116 struct nand_oobinfo
*autooob
;
126 #define ONENAND_CURRENT_BUFFERRAM(this) (this->bufferram_index)
127 #define ONENAND_NEXT_BUFFERRAM(this) (this->bufferram_index ^ 1)
128 #define ONENAND_SET_NEXT_BUFFERRAM(this) (this->bufferram_index ^= 1)
130 #define ONENAND_GET_SYS_CFG1(this) \
131 (this->read_word(this->base + ONENAND_REG_SYS_CFG1))
132 #define ONENAND_SET_SYS_CFG1(v, this) \
133 (this->write_word(v, this->base + ONENAND_REG_SYS_CFG1))
135 /* Check byte access in OneNAND */
136 #define ONENAND_CHECK_BYTE_ACCESS(addr) (addr & 0x1)
141 #define ONENAND_CONT_LOCK (0x0001)
142 #define ONENAND_PAGEBUF_ALLOC (0x1000)
145 * OneNAND Flash Manufacturer ID Codes
147 #define ONENAND_MFR_SAMSUNG 0xec
150 * struct nand_manufacturers - NAND Flash Manufacturer ID Structure
151 * @param name: Manufacturer name
152 * @param id: manufacturer ID code of device.
154 struct onenand_manufacturers
{
159 #endif /* __LINUX_MTD_ONENAND_H */