/*
 * Normal mappings of chips on Samsung s3c2410 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/mtd/partitions.h>
#include <linux/config.h>

#define WINDOW_ADDR 0x01000000 //Base addr
#define WINDOW_SIZE 0x00200000   //Flash length 2M
#define BUSWIDTH 2

static struct mtd_info *mymtd;

__u8 s3c2410_read8(struct map_info *map, unsigned long ofs)
{
	return readb(map->map_priv_1 + ofs);
}

__u16 s3c2410_read16(struct map_info *map, unsigned long ofs)
{
	return readw(map->map_priv_1 + ofs);
}

__u32 s3c2410_read32(struct map_info *map, unsigned long ofs)
{
	return readl(map->map_priv_1 + ofs);
}

void s3c2410_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
{
	memcpy(to, (void *)(map->map_priv_1 + from), len);
}

void s3c2410_write8(struct map_info *map, __u8 d, unsigned long adr)
{
	writeb(d, map->map_priv_1 + adr);
}

void s3c2410_write16(struct map_info *map, __u16 d, unsigned long adr)
{
	writew(d, map->map_priv_1 + adr);
}

void s3c2410_write32(struct map_info *map, __u32 d, unsigned long adr)
{
	writel(d, map->map_priv_1 + adr);
}

void s3c2410_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len)
{
	memcpy((void *)(map->map_priv_1 + to), from, len);
}

struct map_info s3c2410_map = {
	name: "s3c2410 flash device",
	size: WINDOW_SIZE,
	buswidth: BUSWIDTH,
	read8: s3c2410_read8,
	read16: s3c2410_read16,
	read32: s3c2410_read32,
	copy_from: s3c2410_copy_from,
	write8: s3c2410_write8,
	write16: s3c2410_write16,
	write32: s3c2410_write32,
	copy_to: s3c2410_copy_to,
	
	map_priv_1:	WINDOW_ADDR,
	map_priv_2:	-1,	
};
//division
static struct mtd_partition s3c2410_partitions[] = {
    {
            name: "reserved for kernel",
            size: 0x0100000,
            offset: 0x0,
			mask_flags: MTD_WRITEABLE,
    },
	{
		name: "jffs2(8M)",
		size: 0x0100000,
		offset: 0x0100000,
	}
};

int __init init_s3c2410(void)
{
    printk(KERN_NOTICE "s3c2410 flash device: %x at %x\n", WINDOW_SIZE, WINDOW_ADDR);
	s3c2410_map.map_priv_1 = (unsigned long)ioremap(WINDOW_ADDR, WINDOW_SIZE);
//	printk("0\n");
	if (!s3c2410_map.map_priv_1) {
		printk("Failed to ioremap/n");
		return -EIO;
	}
//	printk("1\n");
//	mymtd = do_map_probe("jedec_probe", &s3c2410_map);
//	if (!mymtd)
	mymtd = do_map_probe("cfi_probe", &s3c2410_map);
//	printk("2\n");
//	if (!mymtd)
//		mymtd = do_map_probe("amd_flash", &s3c2410_map);
//	printk("3\n");
	if (mymtd) {
		mymtd->module = THIS_MODULE;
		mymtd->erasesize = 0x10000; //erase volume INTEL E28F128J3A-150 64kb
		return add_mtd_partitions(mymtd, s3c2410_partitions, sizeof(s3c2410_partitions) / sizeof(struct mtd_partition));
	}
//	printk("4\n");
	iounmap((void *)s3c2410_map.map_priv_1);
	return -ENXIO;
}

static void __exit cleanup_s3c2410(void)
{
	if (mymtd) {
		del_mtd_partitions(mymtd);
		map_destroy(mymtd);
	}
	if (s3c2410_map.map_priv_1) {
		iounmap((void *)s3c2410_map.map_priv_1);
		s3c2410_map.map_priv_1 = 0;
	}
}

module_init(init_s3c2410);
module_exit(cleanup_s3c2410);