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 2005/04/11 02:50:25 jack Exp $
7 #include <linux/version.h>
8 #include <linux/module.h>
9 #include <linux/types.h>
10 #include <linux/kernel.h>
12 #include <asm/byteorder.h>
13 #include <linux/errno.h>
14 #include <linux/slab.h>
16 #include <linux/mtd/map.h>
18 static int maprom_read (struct mtd_info *, loff_t, size_t, size_t *, u_char *);
19 static int maprom_write (struct mtd_info *, loff_t, size_t, size_t *, const u_char *);
20 static void maprom_nop (struct mtd_info *);
21 struct mtd_info *map_rom_probe(struct map_info *map);
23 static struct mtd_chip_driver maprom_chipdrv = {
29 struct mtd_info *map_rom_probe(struct map_info *map)
33 mtd = kmalloc(sizeof(*mtd), GFP_KERNEL);
37 memset(mtd, 0, sizeof(*mtd));
39 map->fldrv = &maprom_chipdrv;
41 mtd->name = map->name;
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))
57 static int maprom_read (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf)
59 struct map_info *map = (struct map_info *)mtd->priv;
61 map->copy_from(map, buf, from, len);
66 static void maprom_nop(struct mtd_info *mtd)
68 /* Nothing to see here */
71 static int maprom_write (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf)
73 printk(KERN_NOTICE "maprom_write called\n");
77 int __init map_rom_init(void)
79 register_mtd_chip_driver(&maprom_chipdrv);
83 static void __exit map_rom_exit(void)
85 unregister_mtd_chip_driver(&maprom_chipdrv);
88 module_init(map_rom_init);
89 module_exit(map_rom_exit);
91 MODULE_LICENSE("GPL");
92 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
93 MODULE_DESCRIPTION("MTD chip driver for ROM chips");