/****************************************************************************//* *	uclinux.c -- generic memory mapped MTD driver for uclinux * *	(C) Copyright 2002, Greg Ungerer (gerg@snapgear.com) * * 	$Id: uclinux.c,v 1.2 2002/08/07 00:43:45 gerg 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/mtd/mtd.h>#include <linux/mtd/map.h>#include <linux/mtd/partitions.h>#include <asm/io.h>/****************************************************************************/__u8 uclinux_read8(struct map_info *map, unsigned long ofs){	return(*((__u8 *) (map->map_priv_1 + ofs)));}__u16 uclinux_read16(struct map_info *map, unsigned long ofs){	return(*((__u16 *) (map->map_priv_1 + ofs)));}__u32 uclinux_read32(struct map_info *map, unsigned long ofs){	return(*((__u32 *) (map->map_priv_1 + ofs)));}void uclinux_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len){	memcpy(to, (void *)(map->map_priv_1 + from), len);}void uclinux_write8(struct map_info *map, __u8 d, unsigned long adr){	*((__u8 *) (map->map_priv_1 + adr)) = d;}void uclinux_write16(struct map_info *map, __u16 d, unsigned long adr){	*((__u16 *) (map->map_priv_1 + adr)) = d;}void uclinux_write32(struct map_info *map, __u32 d, unsigned long adr){	*((__u32 *) (map->map_priv_1 + adr)) = d;}void uclinux_copy_to(struct map_info *map, unsigned long to, const void *from, ssize_t len){	memcpy((void *) (map->map_priv_1 + to), from, len);}/****************************************************************************/struct map_info uclinux_ram_map = {	name:		"RAM",	read8:		uclinux_read8,	read16:		uclinux_read16,	read32:		uclinux_read32,	copy_from:	uclinux_copy_from,	write8:		uclinux_write8,	write16:	uclinux_write16,	write32:	uclinux_write32,	copy_to:	uclinux_copy_to,};struct mtd_info *uclinux_ram_mtdinfo;/****************************************************************************/struct mtd_partition uclinux_romfs[] = {	{ name: "ROMfs", offset: 0 }};#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->map_priv_1 + ((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->map_priv_2 = (unsigned long) &_ebss;	mapp->size = PAGE_ALIGN(*((unsigned long *)((&_ebss) + 8)));	mapp->buswidth = 4;	printk("uclinux[mtd]: RAM probe address=0x%x size=0x%x\n",	       	(int) mapp->map_priv_2, (int) mapp->size);	mapp->map_priv_1 = (unsigned long)		ioremap_nocache(mapp->map_priv_2, mapp->size);	if (mapp->map_priv_1 == 0) {		printk("uclinux[mtd]: ioremap_nocache() failed\n");		return(-EIO);	}	mtd = do_map_probe("map_ram", mapp);	if (!mtd) {		printk("uclinux[mtd]: failed to find a mapping?\n");		iounmap((void *) mapp->map_priv_1);		return(-ENXIO);	}			mtd->module = 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.map_priv_1);		uclinux_ram_map.map_priv_1 = 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");/****************************************************************************/