fads.c

linux驱动源码

#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 0x3000000
#define WINDOW_SIZE 0x400000
#define BUSWIDTH 1

static struct mtd_info *mymtd;

__u8 fads_read8(struct map_info *map, unsigned long ofs)
{
	return __raw_readb(map->map_priv_1 + ofs);
}

__u16 fads_read16(struct map_info *map, unsigned long ofs)
{
	return __raw_readw(map->map_priv_1 + ofs);
}

__u32 fads_read32(struct map_info *map, unsigned long ofs)
{
	return __raw_readl(map->map_priv_1 + ofs);
}

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

void fads_write8(struct map_info *map, __u8 d, unsigned long adr)
{
	__raw_writeb(d, map->map_priv_1 + adr);
	mb();
}

void fads_write16(struct map_info *map, __u16 d, unsigned long adr)
{
	__raw_writew(d, map->map_priv_1 + adr);
	mb();
}

void fads_write32(struct map_info *map, __u32 d, unsigned long adr)
{
	__raw_writel(d, map->map_priv_1 + adr);
	mb();
}

void fads_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 fads_map = {
	name: "Intel flash device",
	size: WINDOW_SIZE,
	buswidth: BUSWIDTH,
	read8: fads_read8,
	read16: fads_read16,
	read32: fads_read32,
	copy_from: fads_copy_from,
	write8: fads_write8,
	write16: fads_write16,
	write32: fads_write32,
	copy_to: fads_copy_to
};

/*
 * MTD PARTITIONING STUFF
 */

static struct mtd_partition fads_partitions[] = {
	{
name: "kernel(512K)",
size: 0x80000,
offset: 0x0
	},
	{
name: "user(3584K)",
size: 0x380000,
offset: 0x80000
	}
};

int __init init_fads(void)
{
       	printk(KERN_NOTICE "Intel flash device: %x at %x\n", WINDOW_SIZE, WINDOW_ADDR);
	fads_map.map_priv_1 = (unsigned long)ioremap(WINDOW_ADDR, WINDOW_SIZE);

	if (!fads_map.map_priv_1) {
		printk("Failed to ioremap\n");
		return -EIO;
	}
	mymtd = do_map_probe("cfi_probe", &fads_map);
	if (mymtd) {
		mymtd->module = THIS_MODULE;

		return add_mtd_partitions(mymtd,fads_partitions,
				sizeof(fads_partitions)/
				sizeof(struct mtd_partition));
	}

	iounmap((void *)fads_map.map_priv_1);
	return -ENXIO;
}

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

module_init(init_fads);
module_exit(cleanup_fads);


MODULE_LICENSE("GPL");
MODULE_AUTHOR("David Woodhouse <[e-mail]>");
MODULE_DESCRIPTION("Generic configurable MTD map driver");