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/*
 * Common code to handle map devices which are simple ROM
 * (C) 2000 Red Hat. GPL'd.
 * $Id: map_rom.c,v 1.1.1.1 2004-04-15 01:52:10 phoenix Exp $
 */
 
#include <linux/version.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <asm/io.h>
#include <asm/byteorder.h>
#include <linux/errno.h>
#include <linux/slab.h>
 
#include <linux/mtd/map.h>
 
static int maprom_read (struct mtd_info *, loff_t, size_t, size_t *, u_char *);
static int maprom_write (struct mtd_info *, loff_t, size_t, size_t *, const u_char *);
static void maprom_nop (struct mtd_info *);
struct mtd_info *map_rom_probe(struct map_info *map);
 
static struct mtd_chip_driver maprom_chipdrv = {
	probe: map_rom_probe,
	name: "map_rom",
	module: THIS_MODULE
};
 
struct mtd_info *map_rom_probe(struct map_info *map)
{
	struct mtd_info *mtd;
 
	mtd = kmalloc(sizeof(*mtd), GFP_KERNEL);
	if (!mtd)
		return NULL;
 
	memset(mtd, 0, sizeof(*mtd));
 
	map->fldrv = &maprom_chipdrv;
	mtd->priv = map;
	mtd->name = map->name;
	mtd->type = MTD_ROM;
	mtd->size = map->size;
	mtd->read = maprom_read;
	mtd->write = maprom_write;
	mtd->sync = maprom_nop;
	mtd->flags = MTD_CAP_ROM;
	mtd->erasesize = 131072;
 	while(mtd->size & (mtd->erasesize - 1))
		mtd->erasesize >>= 1;
 
	MOD_INC_USE_COUNT;
	return mtd;
}
 
 
static int maprom_read (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf)
{
	struct map_info *map = (struct map_info *)mtd->priv;
 
	map->copy_from(map, buf, from, len);
	*retlen = len;
	return 0;
}
 
static void maprom_nop(struct mtd_info *mtd)
{
	/* Nothing to see here */
}
 
static int maprom_write (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf)
{
	printk(KERN_NOTICE "maprom_write called\n");
	return -EIO;
}
 
int __init map_rom_init(void)
{
	register_mtd_chip_driver(&maprom_chipdrv);
	return 0;
}
 
static void __exit map_rom_exit(void)
{
	unregister_mtd_chip_driver(&maprom_chipdrv);
}
 
module_init(map_rom_init);
module_exit(map_rom_exit);
 
MODULE_LICENSE("GPL");
MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
MODULE_DESCRIPTION("MTD chip driver for ROM chips");