mx1ads.c

来自「优龙2410linux2.6.8内核源代码」· C语言 代码 · 共 125 行

/*
 * linux/drivers/mtd/maps/mx1ads.c
 *
 * Mapping driver for the Viasys Flowscreen 2 platform, 
 * derived from the innokom.c driver. 
 * 
 * Authors:	Robert Schwebel, Kai-Uwe Bloem, Nicolas Pitre
 * Copyright:	(C) 2001 MontaVista Software Inc.
 *              (C) 2003, 2004 Pengutronix 
 *		(C) 2003 Auerswald GmbH & Co. KG
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/partitions.h>

#include <asm/io.h>

#define MX1ADS_FLASH_SIZE 0x01000000
#define MX1ADS_FLASH_PHYS 0x0C000000

static struct map_info mx1ads_map = {
	.name = 	"mx1ads Flash",
	.bankwidth =	4,
	.size =		MX1ADS_FLASH_SIZE,
	.phys =		MX1ADS_FLASH_PHYS,
};

static struct mtd_partition mx1ads_partitions[] = {
	{
		.name =		"U-Boot",
		.size =		1024*1024,
		.offset =	0x00000000,
		/* mask_flags:	MTD_WRITEABLE	   force read-only          */
	},{
		.name =		"Kernel",
		.size =		1024*1024,
		.offset =	0x00100000,
	},{
		.name =		"Root-FS",
		.size =		13*1024*1024,
		.offset =	0x00200000,
	},{
		.name =		"U-Boot-Environment",
		.size =		1024*1024,
		.offset =	0x00F00000,
	}
};

#define NB_OF(x)  (sizeof(x)/sizeof(x[0]))

static struct mtd_info *mymtd;
static struct mtd_partition *parsed_parts;

static int __init init_mx1ads(void)
{
	struct mtd_partition *parts;
	int nb_parts = 0;
	char *part_type = "static";

	printk("mx1ads: probing flash at 0x%08x\n", MX1ADS_FLASH_PHYS);
	mx1ads_map.virt = (unsigned long)ioremap(MX1ADS_FLASH_PHYS, MX1ADS_FLASH_SIZE);
	
	if (!mx1ads_map.virt) {
		printk("Failed to ioremap\n");
		return -EIO;
	}

	simple_map_init(&mx1ads_map);

	mymtd = do_map_probe("map_rom", &mx1ads_map);
	if (!mymtd) {
		printk("probing failed\n");
		iounmap((void *)mx1ads_map.map_priv_1);
		return -ENXIO;
	}

	/* set partition table */
	parts = mx1ads_partitions; 
	part_type = "static";
	nb_parts = NB_OF(mx1ads_partitions);

	printk(KERN_NOTICE "Using %s partition definition\n", part_type);
	add_mtd_partitions(mymtd, parts, nb_parts);

	return 0;
}

static void __exit cleanup_mx1ads(void)
{
	if (mymtd) {
		del_mtd_partitions(mymtd);
		map_destroy(mymtd);
		if (parsed_parts)
			kfree(parsed_parts);
	}
	if (mx1ads_map.map_priv_1)
		iounmap((void *)mx1ads_map.map_priv_1);
	return;
}

module_init(init_mx1ads);
module_exit(cleanup_mx1ads);