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
|
/*
* $Id: physmap.c,v 1.15 2001/10/02 15:05:14 dwmw2 Exp $
*
* Normal mappings of chips in physical memory
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <asm/io.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/config.h>
#define WINDOW_ADDR CONFIG_MTD_PHYSMAP_START
#define WINDOW_SIZE CONFIG_MTD_PHYSMAP_LEN
#define BUSWIDTH CONFIG_MTD_PHYSMAP_BUSWIDTH
static struct mtd_partition *parsed_parts;
static struct mtd_info *mymtd;
__u8 physmap_read8(struct map_info *map, unsigned long ofs)
{
return __raw_readb(map->map_priv_1 + ofs);
}
__u16 physmap_read16(struct map_info *map, unsigned long ofs)
{
return __raw_readw(map->map_priv_1 + ofs);
}
__u32 physmap_read32(struct map_info *map, unsigned long ofs)
{
return __raw_readl(map->map_priv_1 + ofs);
}
void physmap_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
{
memcpy_fromio(to, map->map_priv_1 + from, len);
}
void physmap_write8(struct map_info *map, __u8 d, unsigned long adr)
{
__raw_writeb(d, map->map_priv_1 + adr);
mb();
}
void physmap_write16(struct map_info *map, __u16 d, unsigned long adr)
{
__raw_writew(d, map->map_priv_1 + adr);
mb();
}
void physmap_write32(struct map_info *map, __u32 d, unsigned long adr)
{
__raw_writel(d, map->map_priv_1 + adr);
mb();
}
void physmap_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
{
memcpy_toio(map->map_priv_1 + to, from, len);
}
struct map_info physmap_map = {
name: "Physically mapped flash",
size: WINDOW_SIZE,
buswidth: BUSWIDTH,
read8: physmap_read8,
read16: physmap_read16,
read32: physmap_read32,
copy_from: physmap_copy_from,
write8: physmap_write8,
write16: physmap_write16,
write32: physmap_write32,
copy_to: physmap_copy_to
};
int __init init_physmap(void)
{
struct mtd_partition *parts;
int nb_parts = 0, ret;
int parsed_nr_parts = 0;
const char *part_type;
printk(KERN_NOTICE "physmap flash device: %x at %x\n", WINDOW_SIZE, WINDOW_ADDR);
physmap_map.map_priv_1 = (unsigned long)ioremap(WINDOW_ADDR, WINDOW_SIZE);
if (!physmap_map.map_priv_1) {
printk("Failed to ioremap\n");
return -EIO;
}
mymtd = do_map_probe("jedec_probe", &physmap_map);
if (!mymtd) {
iounmap((void *)physmap_map.map_priv_1);
return -ENXIO;
}
mymtd->module = THIS_MODULE;
#ifdef CONFIG_MTD_CMDLINE_PARTS
if (parsed_nr_parts == 0) {
int ret = parse_cmdline_partitions(mymtd, &parsed_parts, "physmap");
if (ret > 0) {
part_type = "Command Line";
parsed_nr_parts = ret;
}
}
#endif
if (parsed_nr_parts > 0) {
parts = parsed_parts;
nb_parts = parsed_nr_parts;
}
if (nb_parts == 0) {
printk(KERN_NOTICE "physmap: no partition info available, registering whole flash at once\n");
add_mtd_device(mymtd);
} else {
printk(KERN_NOTICE "physmap: Using %s partition definition\n", part_type);
add_mtd_partitions(mymtd, parts, nb_parts);
}
return 0;
}
static void __exit cleanup_physmap(void)
{
if (mymtd) {
del_mtd_device(mymtd);
map_destroy(mymtd);
}
if (physmap_map.map_priv_1) {
iounmap((void *)physmap_map.map_priv_1);
physmap_map.map_priv_1 = 0;
}
}
module_init(init_physmap);
module_exit(cleanup_physmap);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
MODULE_DESCRIPTION("Generic configurable MTD map driver");
|
