m5272c3.c.4m

linux 下的coldfire cpu的 nor flash 驱动程序

/*
 *
 * 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/mtd/partitions.h>
#include <linux/config.h>


#define WINDOW_ADDR 0xff800000
#define WINDOW_SIZE 0x400000       //4M flash sean 
#define BUSWIDTH 2

static struct mtd_info *mymtd;

struct map_info m5272c3_map = {
	name: "MCF5272C3 flash device",
	phys: WINDOW_ADDR,
	size: WINDOW_SIZE,
	bankwidth: BUSWIDTH
};
/*
 * MTD 'PARTITIONING' STUFF 
 */
#define BOOT_SIZE 0x40000   //256K  bootload reserved
#define IMAGE_SIZE 0x340000 //kenerl and romfs
#define DATA_SIZE 0x80000   //user space
#define NUM_PARTITIONS 3
static struct mtd_partition partition_info[] = {
		{
				name: "boot",
				size: BOOT_SIZE,
				offset: 0
		},

        {
                name: "image",
                size: IMAGE_SIZE,
                offset: BOOT_SIZE
        },
		{
                name: "data",
                size: DATA_SIZE,
                offset: (BOOT_SIZE + IMAGE_SIZE)
        }
};

int __init init_m5272c3(void)
{
	printk(KERN_NOTICE "Motorola M5272C3 flash device: 0x%x at 0x%x\n", WINDOW_SIZE, WINDOW_ADDR);
	m5272c3_map.virt = ioremap(WINDOW_ADDR, WINDOW_SIZE);

	if (!m5272c3_map.virt) {
		printk("Failed to ioremap\n");
		return -EIO;
	}
	simple_map_init(&m5272c3_map);

	mymtd = do_map_probe("cfi_probe", &m5272c3_map);
	if (mymtd) {
		mymtd->owner = THIS_MODULE;
		add_mtd_device(mymtd);
                add_mtd_partitions(mymtd, partition_info, NUM_PARTITIONS);
		return 0;
	}

	iounmap((void *)m5272c3_map.virt);
	return -ENXIO;
}

static void __exit cleanup_m5272c3(void)
{
	if (mymtd) {
		del_mtd_device(mymtd);
		map_destroy(mymtd);
	}
	if (m5272c3_map.virt) {
		iounmap((void *)m5272c3_map.virt);
		m5272c3_map.virt = 0;
	}
}

module_init(init_m5272c3);
module_exit(cleanup_m5272c3);