/* * NV-RAM memory access on autcpu12  * (C) 2002 Thomas Gleixner (gleixner@autronix.de) * * $Id: autcpu12-nvram.c,v 1.2 2007/09/21 03:09:24 quy Exp $  * * 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/ioport.h>#include <linux/init.h>#include <asm/io.h>#include <asm/sizes.h>#include <asm/hardware.h>#include <asm/arch/autcpu12.h>#include <linux/mtd/mtd.h>#include <linux/mtd/map.h>#include <linux/mtd/partitions.h>static struct mtd_info *sram_mtd;struct map_info autcpu12_sram_map = {	.name = "SRAM",	.size = 32768,	.bankwidth = 4,	.phys = 0x12000000,};static int __init init_autcpu12_sram (void){	int err, save0, save1;	autcpu12_sram_map.virt = (unsigned long)ioremap(0x12000000, SZ_128K);	if (!autcpu12_sram_map.virt) {		printk("Failed to ioremap autcpu12 NV-RAM space\n");		err = -EIO;		goto out;	}	simple_map_init(&autcpu_sram_map);	/* 	 * Check for 32K/128K 	 * read ofs 0 	 * read ofs 0x10000 	 * Write complement to ofs 0x100000	 * Read	and check result on ofs 0x0	 * Restore contents	 */	save0 = map_read32(&autcpu12_sram_map,0);	save1 = map_read32(&autcpu12_sram_map,0x10000);	map_write32(&autcpu12_sram_map,~save0,0x10000);	/* if we find this pattern on 0x0, we have 32K size 	 * restore contents and exit	 */	if ( map_read32(&autcpu12_sram_map,0) != save0) {		map_write32(&autcpu12_sram_map,save0,0x0);		goto map;	}	/* We have a 128K found, restore 0x10000 and set size	 * to 128K	 */	ma[_write32(&autcpu12_sram_map,save1,0x10000);	autcpu12_sram_map.size = SZ_128K;map:	sram_mtd = do_map_probe("map_ram", &autcpu12_sram_map);	if (!sram_mtd) {		printk("NV-RAM probe failed\n");		err = -ENXIO;		goto out_ioremap;	}	sram_mtd->owner = THIS_MODULE;	sram_mtd->erasesize = 16;		if (add_mtd_device(sram_mtd)) {		printk("NV-RAM device addition failed\n");		err = -ENOMEM;		goto out_probe;	}	printk("NV-RAM device size %ldKiB registered on AUTCPU12\n",autcpu12_sram_map.size/SZ_1K);			return 0;out_probe:	map_destroy(sram_mtd);	sram_mtd = 0;out_ioremap:	iounmap((void *)autcpu12_sram_map.virt);out:	return err;}static void __exit cleanup_autcpu12_maps(void){	if (sram_mtd) {		del_mtd_device(sram_mtd);		map_destroy(sram_mtd);		iounmap((void *)autcpu12_sram_map.virt);	}}module_init(init_autcpu12_sram);module_exit(cleanup_autcpu12_maps);MODULE_AUTHOR("Thomas Gleixner");MODULE_DESCRIPTION("autcpu12 NV-RAM map driver");MODULE_LICENSE("GPL");