2 * Common code to handle map devices which are simple ROM
3 * (C) 2000 Red Hat. GPL'd.
6 #include <linux/module.h>
7 #include <linux/types.h>
8 #include <linux/kernel.h>
10 #include <asm/byteorder.h>
11 #include <linux/errno.h>
12 #include <linux/slab.h>
13 #include <linux/init.h>
14 #include <linux/mtd/mtd.h>
15 #include <linux/mtd/map.h>
16 #include <linux/mtd/compatmac.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 static struct mtd_info
*map_rom_probe(struct map_info
*map
);
23 static struct mtd_chip_driver maprom_chipdrv
= {
24 .probe
= map_rom_probe
,
29 static struct mtd_info
*map_rom_probe(struct map_info
*map
)
33 mtd
= kzalloc(sizeof(*mtd
), GFP_KERNEL
);
37 map
->fldrv
= &maprom_chipdrv
;
39 mtd
->name
= map
->name
;
41 mtd
->size
= map
->size
;
42 mtd
->read
= maprom_read
;
43 mtd
->write
= maprom_write
;
44 mtd
->sync
= maprom_nop
;
45 mtd
->flags
= MTD_CAP_ROM
;
46 mtd
->erasesize
= map
->size
;
49 __module_get(THIS_MODULE
);
54 static int maprom_read (struct mtd_info
*mtd
, loff_t from
, size_t len
, size_t *retlen
, u_char
*buf
)
56 struct map_info
*map
= mtd
->priv
;
58 map_copy_from(map
, buf
, from
, len
);
63 static void maprom_nop(struct mtd_info
*mtd
)
65 /* Nothing to see here */
68 static int maprom_write (struct mtd_info
*mtd
, loff_t to
, size_t len
, size_t *retlen
, const u_char
*buf
)
70 printk(KERN_NOTICE
"maprom_write called\n");
74 static int __init
map_rom_init(void)
76 register_mtd_chip_driver(&maprom_chipdrv
);
80 static void __exit
map_rom_exit(void)
82 unregister_mtd_chip_driver(&maprom_chipdrv
);
85 module_init(map_rom_init
);
86 module_exit(map_rom_exit
);
88 MODULE_LICENSE("GPL");
89 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
90 MODULE_DESCRIPTION("MTD chip driver for ROM chips");