/*
 * $Id: physmap.c,v 1.15 2001/10/02 15:05:14 dwmw2 Exp $
 *
 * Normal mappings of chips in physical memory
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <asm/io.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/config.h>


#define WINDOW_ADDR CONFIG_MTD_PHYSMAP_START
#define WINDOW_SIZE CONFIG_MTD_PHYSMAP_LEN
#define BUSWIDTH CONFIG_MTD_PHYSMAP_BUSWIDTH

static struct mtd_partition *parsed_parts;
static struct mtd_info *mymtd;

__u8 physmap_read8(struct map_info *map, unsigned long ofs)
{
	return __raw_readb(map->map_priv_1 + ofs);
}

__u16 physmap_read16(struct map_info *map, unsigned long ofs)
{
	return __raw_readw(map->map_priv_1 + ofs);
}

__u32 physmap_read32(struct map_info *map, unsigned long ofs)
{
	return __raw_readl(map->map_priv_1 + ofs);
}

void physmap_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
{
	memcpy_fromio(to, map->map_priv_1 + from, len);
}

void physmap_write8(struct map_info *map, __u8 d, unsigned long adr)
{
	__raw_writeb(d, map->map_priv_1 + adr);
	mb();
}

void physmap_write16(struct map_info *map, __u16 d, unsigned long adr)
{
	__raw_writew(d, map->map_priv_1 + adr);
	mb();
}

void physmap_write32(struct map_info *map, __u32 d, unsigned long adr)
{
	__raw_writel(d, map->map_priv_1 + adr);
	mb();
}

void physmap_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
{
	memcpy_toio(map->map_priv_1 + to, from, len);
}

struct map_info physmap_map = {
	name: "Physically mapped flash",
	size: WINDOW_SIZE,
	buswidth: BUSWIDTH,
	read8: physmap_read8,
	read16: physmap_read16,
	read32: physmap_read32,
	copy_from: physmap_copy_from,
	write8: physmap_write8,
	write16: physmap_write16,
	write32: physmap_write32,
	copy_to: physmap_copy_to
};

int __init init_physmap(void)
{
        struct mtd_partition *parts;
        int nb_parts = 0, ret;
        int parsed_nr_parts = 0;
        const char *part_type;

       	printk(KERN_NOTICE "physmap flash device: %x at %x\n", WINDOW_SIZE, WINDOW_ADDR);
	physmap_map.map_priv_1 = (unsigned long)ioremap(WINDOW_ADDR, WINDOW_SIZE);

	if (!physmap_map.map_priv_1) {
		printk("Failed to ioremap\n");
		return -EIO;
	}
	mymtd = do_map_probe("jedec_probe", &physmap_map);
	if (!mymtd) {
		iounmap((void *)physmap_map.map_priv_1);
		return -ENXIO;	
	}

	mymtd->module = THIS_MODULE;

#ifdef CONFIG_MTD_CMDLINE_PARTS
        if (parsed_nr_parts == 0) {
                int ret = parse_cmdline_partitions(mymtd, &parsed_parts, "physmap");
                if (ret > 0) {
                        part_type = "Command Line";
                        parsed_nr_parts = ret;
                }
        }
#endif

        if (parsed_nr_parts > 0) {
                parts = parsed_parts;
                nb_parts = parsed_nr_parts;
        }

        if (nb_parts == 0) {
                printk(KERN_NOTICE "physmap: no partition info available, registering whole flash at once\n");
                add_mtd_device(mymtd);
        } else {
                printk(KERN_NOTICE "physmap: Using %s partition definition\n", part_type);
                add_mtd_partitions(mymtd, parts, nb_parts);
        }
        return 0;
}

static void __exit cleanup_physmap(void)
{
	if (mymtd) {
		del_mtd_device(mymtd);
		map_destroy(mymtd);
	}
	if (physmap_map.map_priv_1) {
		iounmap((void *)physmap_map.map_priv_1);
		physmap_map.map_priv_1 = 0;
	}
}

module_init(init_physmap);
module_exit(cleanup_physmap);


MODULE_LICENSE("GPL");
MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
MODULE_DESCRIPTION("Generic configurable MTD map driver");