Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-serial
[pandora-kernel.git] / include / linux / mtd / onenand.h
1 /*
2  *  linux/include/linux/mtd/onenand.h
3  *
4  *  Copyright (C) 2005 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/mtd/onenand_regs.h>
17 #include <linux/mtd/bbm.h>
18
19 #define MAX_BUFFERRAM           2
20
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);
25
26 /**
27  * onenand_state_t - chip states
28  * Enumeration for OneNAND flash chip state
29  */
30 typedef enum {
31         FL_READY,
32         FL_READING,
33         FL_WRITING,
34         FL_ERASING,
35         FL_SYNCING,
36         FL_UNLOCKING,
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  * @param block         block address in BufferRAM
46  * @param page          page address in BufferRAM
47  * @param 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  * @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 ecclayout     [REPLACEABLE] the default ecc placement scheme
81  * @param bbm           [REPLACEABLE] pointer to Bad Block Management
82  * @param priv          [OPTIONAL] pointer to private chip date
83  */
84 struct onenand_chip {
85         void __iomem            *base;
86         unsigned int            chipsize;
87         unsigned int            device_id;
88         unsigned int            density_mask;
89         unsigned int            options;
90
91         unsigned int            erase_shift;
92         unsigned int            page_shift;
93         unsigned int            ppb_shift;      /* Pages per block shift */
94         unsigned int            page_mask;
95
96         unsigned int            bufferram_index;
97         struct onenand_bufferram        bufferram[MAX_BUFFERRAM];
98
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);
110
111         spinlock_t              chip_lock;
112         wait_queue_head_t       wq;
113         onenand_state_t         state;
114         unsigned char           *page_buf;
115
116         struct nand_ecclayout   *ecclayout;
117
118         void                    *bbm;
119
120         void                    *priv;
121 };
122
123 /*
124  * Helper macros
125  */
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)
129
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))
134
135 /* Check byte access in OneNAND */
136 #define ONENAND_CHECK_BYTE_ACCESS(addr)         (addr & 0x1)
137
138 /*
139  * Options bits
140  */
141 #define ONENAND_CONT_LOCK               (0x0001)
142 #define ONENAND_PAGEBUF_ALLOC           (0x1000)
143
144 /*
145  * OneNAND Flash Manufacturer ID Codes
146  */
147 #define ONENAND_MFR_SAMSUNG     0xec
148
149 /**
150  * struct nand_manufacturers - NAND Flash Manufacturer ID Structure
151  * @param name:         Manufacturer name
152  * @param id:           manufacturer ID code of device.
153 */
154 struct onenand_manufacturers {
155         int id;
156         char *name;
157 };
158
159 #endif  /* __LINUX_MTD_ONENAND_H */