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
|
/****************************************************************************/
/*
* uclinux.c -- generic memory mapped MTD driver for uclinux
*
* (C) Copyright 2002, Greg Ungerer (gerg@snapgear.com)
*/
/****************************************************************************/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/major.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/partitions.h>
#include <asm/io.h>
/****************************************************************************/
extern char _ebss;
struct map_info uclinux_ram_map = {
.name = "RAM",
.phys = (unsigned long)&_ebss,
.size = 0,
};
static struct mtd_info *uclinux_ram_mtdinfo;
/****************************************************************************/
static struct mtd_partition uclinux_romfs[] = {
{ .name = "ROMfs" }
};
#define NUM_PARTITIONS ARRAY_SIZE(uclinux_romfs)
/****************************************************************************/
static int uclinux_point(struct mtd_info *mtd, loff_t from, size_t len,
size_t *retlen, void **virt, resource_size_t *phys)
{
struct map_info *map = mtd->priv;
*virt = map->virt + from;
if (phys)
*phys = map->phys + from;
*retlen = len;
return(0);
}
/****************************************************************************/
static int __init uclinux_mtd_init(void)
{
struct mtd_info *mtd;
struct map_info *mapp;
mapp = &uclinux_ram_map;
if (!mapp->size)
mapp->size = PAGE_ALIGN(ntohl(*((unsigned long *)(mapp->phys + 8))));
mapp->bankwidth = 4;
printk("uclinux[mtd]: RAM probe address=0x%x size=0x%x\n",
(int) mapp->phys, (int) mapp->size);
mapp->virt = ioremap_nocache(mapp->phys, mapp->size);
if (mapp->virt == 0) {
printk("uclinux[mtd]: ioremap_nocache() failed\n");
return(-EIO);
}
simple_map_init(mapp);
mtd = do_map_probe("map_ram", mapp);
if (!mtd) {
printk("uclinux[mtd]: failed to find a mapping?\n");
iounmap(mapp->virt);
return(-ENXIO);
}
mtd->owner = THIS_MODULE;
mtd->point = uclinux_point;
mtd->priv = mapp;
uclinux_ram_mtdinfo = mtd;
mtd_device_register(mtd, uclinux_romfs, NUM_PARTITIONS);
return(0);
}
/****************************************************************************/
static void __exit uclinux_mtd_cleanup(void)
{
if (uclinux_ram_mtdinfo) {
mtd_device_unregister(uclinux_ram_mtdinfo);
map_destroy(uclinux_ram_mtdinfo);
uclinux_ram_mtdinfo = NULL;
}
if (uclinux_ram_map.virt) {
iounmap((void *) uclinux_ram_map.virt);
uclinux_ram_map.virt = 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");
/****************************************************************************/
|
