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
|
/****************************************************************************/
/*
* uclinux.c -- generic memory mapped MTD driver for uclinux
*
* (C) Copyright 2002, Greg Ungerer (gerg@snapgear.com)
*/
/****************************************************************************/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/major.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/partitions.h>
#include <asm/io.h>
/****************************************************************************/
__u8 uclinux_read8(struct map_info *map, unsigned long ofs)
{
return(*((__u8 *) (map->map_priv_1 + ofs)));
}
__u16 uclinux_read16(struct map_info *map, unsigned long ofs)
{
return(*((__u16 *) (map->map_priv_1 + ofs)));
}
__u32 uclinux_read32(struct map_info *map, unsigned long ofs)
{
return(*((__u32 *) (map->map_priv_1 + ofs)));
}
void uclinux_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
{
memcpy(to, (void *)(map->map_priv_1 + from), len);
}
void uclinux_write8(struct map_info *map, __u8 d, unsigned long adr)
{
*((__u8 *) (map->map_priv_1 + adr)) = d;
}
void uclinux_write16(struct map_info *map, __u16 d, unsigned long adr)
{
*((__u16 *) (map->map_priv_1 + adr)) = d;
}
void uclinux_write32(struct map_info *map, __u32 d, unsigned long adr)
{
*((__u32 *) (map->map_priv_1 + adr)) = d;
}
void uclinux_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
{
memcpy((void *) (map->map_priv_1 + to), from, len);
}
/****************************************************************************/
struct map_info uclinux_ram_map = {
name: "RAM",
read8: uclinux_read8,
read16: uclinux_read16,
read32: uclinux_read32,
copy_from: uclinux_copy_from,
write8: uclinux_write8,
write16: uclinux_write16,
write32: uclinux_write32,
copy_to: uclinux_copy_to,
};
struct mtd_info *uclinux_ram_mtdinfo;
/****************************************************************************/
struct mtd_partition uclinux_romfs[] = {
{ name: "ROMfs", offset: 0 }
};
#define NUM_PARTITIONS (sizeof(uclinux_romfs) / sizeof(uclinux_romfs[0]))
/****************************************************************************/
int uclinux_point(struct mtd_info *mtd, loff_t from, size_t len,
size_t *retlen, u_char **mtdbuf)
{
struct map_info *map = (struct map_info *) mtd->priv;
*mtdbuf = (u_char *) (map->map_priv_1 + ((int) from));
*retlen = len;
return(0);
}
/****************************************************************************/
int __init uclinux_mtd_init(void)
{
struct mtd_info *mtd;
struct map_info *mapp;
extern char _ebss;
mapp = &uclinux_ram_map;
mapp->map_priv_2 = (unsigned long) &_ebss;
mapp->size = PAGE_ALIGN(*((unsigned long *)((&_ebss) + 8)));
mapp->buswidth = 4;
printk("uclinux[mtd]: RAM probe address=0x%x size=0x%x\n",
(int) mapp->map_priv_2, (int) mapp->size);
mapp->map_priv_1 = (unsigned long)
ioremap_nocache(mapp->map_priv_2, mapp->size);
if (mapp->map_priv_1 == 0) {
printk("uclinux[mtd]: ioremap_nocache() failed\n");
return(-EIO);
}
mtd = do_map_probe("map_ram", mapp);
if (!mtd) {
printk("uclinux[mtd]: failed to find a mapping?\n");
iounmap((void *) mapp->map_priv_1);
return(-ENXIO);
}
mtd->module = THIS_MODULE;
mtd->point = uclinux_point;
mtd->priv = mapp;
uclinux_ram_mtdinfo = mtd;
add_mtd_partitions(mtd, uclinux_romfs, NUM_PARTITIONS);
printk("uclinux[mtd]: set %s to be root filesystem\n",
uclinux_romfs[0].name);
ROOT_DEV = MKDEV(MTD_BLOCK_MAJOR, 0);
put_mtd_device(mtd);
return(0);
}
/****************************************************************************/
void __exit uclinux_mtd_cleanup(void)
{
if (uclinux_ram_mtdinfo) {
del_mtd_partitions(uclinux_ram_mtdinfo);
map_destroy(uclinux_ram_mtdinfo);
uclinux_ram_mtdinfo = NULL;
}
if (uclinux_ram_map.map_priv_1) {
iounmap((void *) uclinux_ram_map.map_priv_1);
uclinux_ram_map.map_priv_1 = 0;
}
}
/****************************************************************************/
module_init(uclinux_mtd_init);
module_exit(uclinux_mtd_cleanup);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Greg Ungerer <gerg@snapgear.com>");
MODULE_DESCRIPTION("Generic RAM based MTD for uClinux");
/****************************************************************************/
|
