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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");