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
|
/*
* Common code to handle map devices which are simple ROM
* (C) 2000 Red Hat. GPL'd.
* $Id: map_rom.c,v 1.23 2005/01/05 18:05:12 dwmw2 Exp $
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <asm/io.h>
#include <asm/byteorder.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/compatmac.h>
static int maprom_read (struct mtd_info *, loff_t, size_t, size_t *, u_char *);
static int maprom_write (struct mtd_info *, loff_t, size_t, size_t *, const u_char *);
static void maprom_nop (struct mtd_info *);
static struct mtd_info *map_rom_probe(struct map_info *map);
static struct mtd_chip_driver maprom_chipdrv = {
.probe = map_rom_probe,
.name = "map_rom",
.module = THIS_MODULE
};
static struct mtd_info *map_rom_probe(struct map_info *map)
{
struct mtd_info *mtd;
mtd = kmalloc(sizeof(*mtd), GFP_KERNEL);
if (!mtd)
return NULL;
memset(mtd, 0, sizeof(*mtd));
map->fldrv = &maprom_chipdrv;
mtd->priv = map;
mtd->name = map->name;
mtd->type = MTD_ROM;
mtd->size = map->size;
mtd->read = maprom_read;
mtd->write = maprom_write;
mtd->sync = maprom_nop;
mtd->flags = MTD_CAP_ROM;
mtd->erasesize = 131072;
while(mtd->size & (mtd->erasesize - 1))
mtd->erasesize >>= 1;
__module_get(THIS_MODULE);
return mtd;
}
static int maprom_read (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf)
{
struct map_info *map = mtd->priv;
map_copy_from(map, buf, from, len);
*retlen = len;
return 0;
}
static void maprom_nop(struct mtd_info *mtd)
{
/* Nothing to see here */
}
static int maprom_write (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf)
{
printk(KERN_NOTICE "maprom_write called\n");
return -EIO;
}
static int __init map_rom_init(void)
{
register_mtd_chip_driver(&maprom_chipdrv);
return 0;
}
static void __exit map_rom_exit(void)
{
unregister_mtd_chip_driver(&maprom_chipdrv);
}
module_init(map_rom_init);
module_exit(map_rom_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
MODULE_DESCRIPTION("MTD chip driver for ROM chips");
|
