1/*
2 * Common code to handle map devices which are simple ROM
3 * (C) 2000 Red Hat. GPL'd.
4 * $Id: map_rom.c,v 1.1.1.1 2008/10/15 03:26:35 james26_jang Exp $
5 */
6
7#include <linux/version.h>
8#include <linux/module.h>
9#include <linux/types.h>
10#include <linux/kernel.h>
11#include <asm/io.h>
12#include <asm/byteorder.h>
13#include <linux/errno.h>
14#include <linux/slab.h>
15
16#include <linux/mtd/map.h>
17
18static int maprom_read (struct mtd_info *, loff_t, size_t, size_t *, u_char *);
19static int maprom_write (struct mtd_info *, loff_t, size_t, size_t *, const u_char *);
20static void maprom_nop (struct mtd_info *);
21struct mtd_info *map_rom_probe(struct map_info *map);
22
23static struct mtd_chip_driver maprom_chipdrv = {
24	probe: map_rom_probe,
25	name: "map_rom",
26	module: THIS_MODULE
27};
28
29struct mtd_info *map_rom_probe(struct map_info *map)
30{
31	struct mtd_info *mtd;
32
33	mtd = kmalloc(sizeof(*mtd), GFP_KERNEL);
34	if (!mtd)
35		return NULL;
36
37	memset(mtd, 0, sizeof(*mtd));
38
39	map->fldrv = &maprom_chipdrv;
40	mtd->priv = map;
41	mtd->name = map->name;
42	mtd->type = MTD_ROM;
43	mtd->size = map->size;
44	mtd->read = maprom_read;
45	mtd->write = maprom_write;
46	mtd->sync = maprom_nop;
47	mtd->flags = MTD_CAP_ROM;
48	mtd->erasesize = 131072;
49 	while(mtd->size & (mtd->erasesize - 1))
50		mtd->erasesize >>= 1;
51
52	MOD_INC_USE_COUNT;
53	return mtd;
54}
55
56
57static int maprom_read (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf)
58{
59	struct map_info *map = (struct map_info *)mtd->priv;
60
61	map->copy_from(map, buf, from, len);
62	*retlen = len;
63	return 0;
64}
65
66static void maprom_nop(struct mtd_info *mtd)
67{
68	/* Nothing to see here */
69}
70
71static int maprom_write (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf)
72{
73	printk(KERN_NOTICE "maprom_write called\n");
74	return -EIO;
75}
76
77int __init map_rom_init(void)
78{
79	register_mtd_chip_driver(&maprom_chipdrv);
80	return 0;
81}
82
83static void __exit map_rom_exit(void)
84{
85	unregister_mtd_chip_driver(&maprom_chipdrv);
86}
87
88module_init(map_rom_init);
89module_exit(map_rom_exit);
90
91MODULE_LICENSE("GPL");
92MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
93MODULE_DESCRIPTION("MTD chip driver for ROM chips");
94