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