1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
|
/*
* $Id: nora.c,v 1.21 2001/10/02 15:05:14 dwmw2 Exp $
*
* This is so simple I love it.
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#define WINDOW_ADDR 0xd0000000
#define WINDOW_SIZE 0x04000000
static struct mtd_info *mymtd;
__u8 nora_read8(struct map_info *map, unsigned long ofs)
{
return *(__u8 *)(WINDOW_ADDR + ofs);
}
__u16 nora_read16(struct map_info *map, unsigned long ofs)
{
return *(__u16 *)(WINDOW_ADDR + ofs);
}
__u32 nora_read32(struct map_info *map, unsigned long ofs)
{
return *(__u32 *)(WINDOW_ADDR + ofs);
}
void nora_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
{
memcpy(to, (void *)(WINDOW_ADDR + from), len);
}
void nora_write8(struct map_info *map, __u8 d, unsigned long adr)
{
*(__u8 *)(WINDOW_ADDR + adr) = d;
}
void nora_write16(struct map_info *map, __u16 d, unsigned long adr)
{
*(__u16 *)(WINDOW_ADDR + adr) = d;
}
void nora_write32(struct map_info *map, __u32 d, unsigned long adr)
{
*(__u32 *)(WINDOW_ADDR + adr) = d;
}
void nora_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
{
memcpy((void *)(WINDOW_ADDR + to), from, len);
}
struct map_info nora_map = {
name: "NORA",
size: WINDOW_SIZE,
buswidth: 2,
read8: nora_read8,
read16: nora_read16,
read32: nora_read32,
copy_from: nora_copy_from,
write8: nora_write8,
write16: nora_write16,
write32: nora_write32,
copy_to: nora_copy_to
};
static int nora_mtd_read (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf)
{
return mymtd->read(mymtd, from + (unsigned long)mtd->priv, len, retlen, buf);
}
static int nora_mtd_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf)
{
return mymtd->write(mymtd, to + (unsigned long)mtd->priv, len, retlen, buf);
}
static int nora_mtd_erase (struct mtd_info *mtd, struct erase_info *instr)
{
instr->addr += (unsigned long)mtd->priv;
return mymtd->erase(mymtd, instr);
}
static void nora_mtd_sync (struct mtd_info *mtd)
{
mymtd->sync(mymtd);
}
static int nora_mtd_suspend (struct mtd_info *mtd)
{
return mymtd->suspend(mymtd);
}
static void nora_mtd_resume (struct mtd_info *mtd)
{
mymtd->resume(mymtd);
}
static struct mtd_info nora_mtds[4] = { /* boot, kernel, ramdisk, fs */
{
type: MTD_NORFLASH,
flags: MTD_CAP_NORFLASH,
size: 0x60000,
erasesize: 0x20000,
name: "NORA boot firmware",
module: THIS_MODULE,
erase: nora_mtd_erase,
read: nora_mtd_read,
write: nora_mtd_write,
suspend: nora_mtd_suspend,
resume: nora_mtd_resume,
sync: nora_mtd_sync,
priv: (void *)0
},
{
type: MTD_NORFLASH,
flags: MTD_CAP_NORFLASH,
size: 0x0a0000,
erasesize: 0x20000,
name: "NORA kernel",
module: THIS_MODULE,
erase: nora_mtd_erase,
read: nora_mtd_read,
write: nora_mtd_write,
suspend: nora_mtd_suspend,
resume: nora_mtd_resume,
sync: nora_mtd_sync,
priv: (void *)0x60000
},
{
type: MTD_NORFLASH,
flags: MTD_CAP_NORFLASH,
size: 0x900000,
erasesize: 0x20000,
name: "NORA root filesystem",
module: THIS_MODULE,
erase: nora_mtd_erase,
read: nora_mtd_read,
write: nora_mtd_write,
suspend: nora_mtd_suspend,
resume: nora_mtd_resume,
sync: nora_mtd_sync,
priv: (void *)0x100000
},
{
type: MTD_NORFLASH,
flags: MTD_CAP_NORFLASH,
size: 0x1600000,
erasesize: 0x20000,
name: "NORA second filesystem",
module: THIS_MODULE,
erase: nora_mtd_erase,
read: nora_mtd_read,
write: nora_mtd_write,
suspend: nora_mtd_suspend,
resume: nora_mtd_resume,
sync: nora_mtd_sync,
priv: (void *)0xa00000
}
};
int __init init_nora(void)
{
printk(KERN_NOTICE "nora flash device: %x at %x\n", WINDOW_SIZE, WINDOW_ADDR);
mymtd = do_map_probe("cfi_probe", &nora_map);
if (mymtd) {
mymtd->module = THIS_MODULE;
add_mtd_device(&nora_mtds[2]);
add_mtd_device(&nora_mtds[0]);
add_mtd_device(&nora_mtds[1]);
add_mtd_device(&nora_mtds[3]);
return 0;
}
return -ENXIO;
}
static void __exit cleanup_nora(void)
{
if (mymtd) {
del_mtd_device(&nora_mtds[3]);
del_mtd_device(&nora_mtds[1]);
del_mtd_device(&nora_mtds[0]);
del_mtd_device(&nora_mtds[2]);
map_destroy(mymtd);
}
}
module_init(init_nora);
module_exit(cleanup_nora);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Red Hat, Inc. - David Woodhouse <dwmw2@cambridge.redhat.com>");
MODULE_DESCRIPTION("MTD map driver for Nora board");
|
