mba44b0.c

来自「microwindows移植到S3C44B0的源码」· C语言 代码 · 共 123 行

/*
 *
 * 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 0x00000000
#define WINDOW_SIZE 0x00080000
#define BUSWIDTH 1

static struct mtd_info *mymtd;

__u8 mba44b0_read8(struct map_info *map, unsigned long ofs)
{
	return __raw_readb(map->map_priv_1 + ofs);
}

__u16 mba44b0_read16(struct map_info *map, unsigned long ofs)
{
	return __raw_readw(map->map_priv_1 + ofs);
}

__u32 mba44b0_read32(struct map_info *map, unsigned long ofs)
{
	return __raw_readl(map->map_priv_1 + ofs);
}

void mba44b0_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
{
	memcpy_fromio(to, map->map_priv_1 + from, len);
}

void mba44b0_write8(struct map_info *map, __u8 d, unsigned long adr)
{
	__raw_writeb(d, map->map_priv_1 + adr);
	mb();
}

void mba44b0_write16(struct map_info *map, __u16 d, unsigned long adr)
{
	__raw_writew(d, map->map_priv_1 + adr);
	mb();
}

void mba44b0_write32(struct map_info *map, __u32 d, unsigned long adr)
{
	__raw_writel(d, map->map_priv_1 + adr);
	mb();
}

void mba44b0_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 mba44b0_map = {
	name: "MBA-44B0 flash device",
	size: WINDOW_SIZE,
	buswidth: BUSWIDTH,
	read8: mba44b0_read8,
	read16: mba44b0_read16,
	read32: mba44b0_read32,
	copy_from: mba44b0_copy_from,
	write8: mba44b0_write8,
	write16: mba44b0_write16,
	write32: mba44b0_write32,
	copy_to: mba44b0_copy_to
};

/*
 * MTD 'PARTITIONING' STUFF 
 */

static struct mtd_partition mba44b0_partitions[] = {
        {
                name: "bootloader",
                size: 0x10000,
                offset: 0x00000
        },
        {
                name: "rootfs (1024K)",
                size: 0x70000,
                offset: 0x10000
        }
};

int __init init_mba44b0(void)
{
       	printk(KERN_NOTICE "mba44b0 flash device: %x at %x\n", WINDOW_SIZE, WINDOW_ADDR);
	
	mymtd = do_map_probe("cfi_probe", &mba44b0_map);
	if (mymtd) {
		mymtd->module = THIS_MODULE;

		return add_mtd_partitions(mymtd, mba44b0_partitions,
					  sizeof(mba44b0_partitions) /
					  sizeof(struct mtd_partition));
	}

	return -ENXIO;
}

static void __exit cleanup_mba44b0(void)
{
	if (mymtd) {
		del_mtd_partitions(mymtd);
		map_destroy(mymtd);
	}
}

module_init(init_mba44b0);
module_exit(cleanup_mba44b0);