/****************************************************************************//* *	uclinux.c -- generic memory mapped MTD driver for uclinux * *	(C) Copyright 2002, Greg Ungerer (gerg@snapgear.com) * * 	$Id: uclinux.c,v 1.2 2007/09/21 03:09:24 quy Exp $ *//****************************************************************************/#include <linux/config.h>#include <linux/module.h>#include <linux/types.h>#include <linux/init.h>#include <linux/kernel.h>#include <linux/fs.h>#include <linux/major.h>#include <linux/root_dev.h>#include <linux/mtd/mtd.h>#include <linux/mtd/map.h>#include <linux/mtd/partitions.h>#include <asm/io.h>/****************************************************************************//****************************************************************************/struct map_info uclinux_ram_map = {	.name = "RAM",};struct mtd_info *uclinux_ram_mtdinfo;/****************************************************************************/struct mtd_partition uclinux_romfs[] = {	{ .name = "ROMfs" }};#define	NUM_PARTITIONS	(sizeof(uclinux_romfs) / sizeof(uclinux_romfs[0]))/****************************************************************************/int uclinux_point(struct mtd_info *mtd, loff_t from, size_t len,	size_t *retlen, u_char **mtdbuf){	struct map_info *map = (struct map_info *) mtd->priv;	*mtdbuf = (u_char *) (map->virt + ((int) from));	*retlen = len;	return(0);}/****************************************************************************/int __init uclinux_mtd_init(void){	struct mtd_info *mtd;	struct map_info *mapp;	extern char _ebss;	mapp = &uclinux_ram_map;	mapp->phys = (unsigned long) &_ebss;	mapp->size = PAGE_ALIGN(*((unsigned long *)((&_ebss) + 8)));	mapp->bankwidth = 4;	printk("uclinux[mtd]: RAM probe address=0x%x size=0x%x\n",	       	(int) mapp->map_priv_2, (int) mapp->size);	mapp->virt = (unsigned long)		ioremap_nocache(mapp->phys, mapp->size);	if (mapp->virt == 0) {		printk("uclinux[mtd]: ioremap_nocache() failed\n");		return(-EIO);	}	simple_map_init(mapp);	mtd = do_map_probe("map_ram", mapp);	if (!mtd) {		printk("uclinux[mtd]: failed to find a mapping?\n");		iounmap((void *) mapp->virt);		return(-ENXIO);	}			mtd->owner = THIS_MODULE;	mtd->point = uclinux_point;	mtd->priv = mapp;	uclinux_ram_mtdinfo = mtd;	add_mtd_partitions(mtd, uclinux_romfs, NUM_PARTITIONS);	printk("uclinux[mtd]: set %s to be root filesystem\n",	     	uclinux_romfs[0].name);	ROOT_DEV = MKDEV(MTD_BLOCK_MAJOR, 0);	put_mtd_device(mtd);	return(0);}/****************************************************************************/void __exit uclinux_mtd_cleanup(void){	if (uclinux_ram_mtdinfo) {		del_mtd_partitions(uclinux_ram_mtdinfo);		map_destroy(uclinux_ram_mtdinfo);		uclinux_ram_mtdinfo = NULL;	}	if (uclinux_ram_map.map_priv_1) {		iounmap((void *) uclinux_ram_map.virt);		uclinux_ram_map.virt = 0;	}}/****************************************************************************/module_init(uclinux_mtd_init);module_exit(uclinux_mtd_cleanup);MODULE_LICENSE("GPL");MODULE_AUTHOR("Greg Ungerer <gerg@snapgear.com>");MODULE_DESCRIPTION("Generic RAM based MTD for uClinux");/****************************************************************************/