projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
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 1.23 2005/01/05 18:05:12 dwmw2 Exp $ | |
| 5 | */ | |
| 6 | ||
| 7 | #include <linux/module.h> | |
| 8 | #include <linux/types.h> | |
| 9 | #include <linux/kernel.h> | |
| 10 | #include <asm/io.h> | |
| 11 | #include <asm/byteorder.h> | |
| 12 | #include <linux/errno.h> | |
| 13 | #include <linux/slab.h> | |
| 14 | #include <linux/init.h> | |
| 15 | #include <linux/mtd/mtd.h> | |
| 16 | #include <linux/mtd/map.h> | |
| 17 | #include <linux/mtd/compatmac.h> | |
| 18 | ||
| 19 | static int maprom_read (struct mtd_info *, loff_t, size_t, size_t *, u_char *); | |
| 20 | static int maprom_write (struct mtd_info *, loff_t, size_t, size_t *, const u_char *); | |
| 21 | static void maprom_nop (struct mtd_info *); | |
| 22 | static struct mtd_info *map_rom_probe(struct map_info *map); | |
| 23 | ||
| 24 | static struct mtd_chip_driver maprom_chipdrv = { | |
| 25 | .probe = map_rom_probe, | |
| 26 | .name = "map_rom", | |
| 27 | .module = THIS_MODULE | |
| 28 | }; | |
| 29 | ||
| 30 | static struct mtd_info *map_rom_probe(struct map_info *map) | |
| 31 | { | |
| 32 | struct mtd_info *mtd; | |
| 33 | ||
| 34 | mtd = kmalloc(sizeof(*mtd), GFP_KERNEL); | |
| 35 | if (!mtd) | |
| 36 | return NULL; | |
| 37 | ||
| 38 | memset(mtd, 0, sizeof(*mtd)); | |
| 39 | ||
| 40 | map->fldrv = &maprom_chipdrv; | |
| 41 | mtd->priv = map; | |
| 42 | mtd->name = map->name; | |
| 21c8db9e | 43 | mtd->type = MTD_ROM; |
| 1da177e4 LT |
44 | mtd->size = map->size; |
| 45 | mtd->read = maprom_read; | |
| 46 | mtd->write = maprom_write; | |
| 47 | mtd->sync = maprom_nop; | |
| 48 | mtd->flags = MTD_CAP_ROM; | |
| e369d62e | 49 | mtd->erasesize = map->size; |
| 1da177e4 LT |
50 | |
| 51 | __module_get(THIS_MODULE); | |
| 52 | return mtd; | |
| 53 | } | |
| 54 | ||
| 55 | ||
| 56 | static int maprom_read (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf) | |
| 57 | { | |
| 58 | struct map_info *map = mtd->priv; | |
| 59 | ||
| 60 | map_copy_from(map, buf, from, len); | |
| 61 | *retlen = len; | |
| 62 | return 0; | |
| 63 | } | |
| 64 | ||
| 65 | static void maprom_nop(struct mtd_info *mtd) | |
| 66 | { | |
| 67 | /* Nothing to see here */ | |
| 68 | } | |
| 69 | ||
| 70 | static int maprom_write (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf) | |
| 71 | { | |
| 72 | printk(KERN_NOTICE "maprom_write called\n"); | |
| 73 | return -EIO; | |
| 74 | } | |
| 75 | ||
| 76 | static int __init map_rom_init(void) | |
| 77 | { | |
| 78 | register_mtd_chip_driver(&maprom_chipdrv); | |
| 79 | return 0; | |
| 80 | } | |
| 81 | ||
| 82 | static void __exit map_rom_exit(void) | |
| 83 | { | |
| 84 | unregister_mtd_chip_driver(&maprom_chipdrv); | |
| 85 | } | |
| 86 | ||
| 87 | module_init(map_rom_init); | |
| 88 | module_exit(map_rom_exit); | |
| 89 | ||
| 90 | MODULE_LICENSE("GPL"); | |
| 91 | MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>"); | |
| 92 | MODULE_DESCRIPTION("MTD chip driver for ROM chips"); |