dmc405.c

linux下的MTD设备驱动源代码,配合jffs2 yaffss2文件系统.

/*
 * $Id: dmc405.c,v 1.15 2001/10/02 15:05:14 dwmw2 Exp $
 *
 * Handle mapping of the flash on the NEXTREAM DMC board
 */

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


#define BOOT_WINDOW_ADDR 0xff800000
#define BOOT_WINDOW_SIZE 0x800000
#define SPARE_WINDOW_ADDR 0xff000000
#define SPARE_WINDOW_SIZE 0x800000

static struct mtd_info *dmc405_boot, *dmc405_spare;

struct map_info dmc405_boot_map = {
	name: "DMC Boot",
	size: BOOT_WINDOW_SIZE,
	buswidth: 2,
};

int __init init_dmc405_boot(void)
{
	printk(KERN_NOTICE "DMC boot flash device: %x at %x\n", 
	       BOOT_WINDOW_SIZE, BOOT_WINDOW_ADDR);
	dmc405_boot_map.virt = (unsigned long)ioremap(BOOT_WINDOW_ADDR, 
						      BOOT_WINDOW_SIZE);
	dmc405_boot_map.phys = BOOT_WINDOW_ADDR;

	if (!dmc405_boot_map.virt) {
		printk("Failed to ioremap\n");
		return -EIO;
	}

	simple_map_init(&dmc405_boot_map);

	dmc405_boot = do_map_probe("cfi_probe", &dmc405_boot_map);
	if (dmc405_boot) {
		dmc405_boot->owner = THIS_MODULE;
		add_mtd_device(dmc405_boot);
		return 0;
	}

	iounmap((void *)dmc405_boot_map.virt);
	return -ENXIO;
}

static void __exit cleanup_dmc405_boot(void)
{
	if (dmc405_boot) {
		del_mtd_device(dmc405_boot);
		map_destroy(dmc405_boot);
	}
	if (dmc405_boot_map.virt) {
		iounmap((void *)dmc405_boot_map.virt);
		dmc405_boot_map.virt = 0;
	}
}

struct map_info dmc405_spare_map = {
	name: "DMC Spare",
	size: SPARE_WINDOW_SIZE,
	buswidth: 2,
};

int __init init_dmc405_spare(void)
{
	printk(KERN_NOTICE "DMC spare flash device: %x at %x\n", 
	       SPARE_WINDOW_SIZE, SPARE_WINDOW_ADDR);
	dmc405_spare_map.virt = (unsigned long)ioremap(SPARE_WINDOW_ADDR, 
						       SPARE_WINDOW_SIZE);
	dmc405_spare_map.phys = SPARE_WINDOW_ADDR;

	if (!dmc405_spare_map.virt) {
		printk("Failed to ioremap\n");
		return -EIO;
	}

	simple_map_init(&dmc405_spare_map);

	dmc405_spare = do_map_probe("cfi_probe", &dmc405_spare_map);
	if (dmc405_spare) {
		dmc405_spare->owner = THIS_MODULE;
		add_mtd_device(dmc405_spare);
		return 0;
	}

	iounmap((void *)dmc405_spare_map.virt);
	return -ENXIO;
}

static void __exit cleanup_dmc405_spare(void)
{
	if (dmc405_spare) {
		del_mtd_device(dmc405_spare);
		map_destroy(dmc405_spare);
	}
	if (dmc405_spare_map.virt) {
		iounmap((void *)dmc405_spare_map.virt);
		dmc405_spare_map.virt = 0;
	}
}

int __init init_dmc405(void)
{
	init_dmc405_boot();
	init_dmc405_spare();
}

static void __exit cleanup_dmc405(void)
{
	cleanup_dmc405_boot();
	cleanup_dmc405_spare();
}

module_init(init_dmc405);
module_exit(cleanup_dmc405);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("MTD map driver for NEXTREAM DMC board");