[linux-2.6-block.git] / drivers / mtd / maps / autcpu12-nvram.c

/*
 * NV-RAM memory access on autcpu12
 * (C) 2002 Thomas Gleixner (gleixner@autronix.de)
 *
 * 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 <mach/hardware.h>
#include <mach/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 = 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
	 */
	map_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");
Commit	Line	Data
1da177e4	1	/*
69f34c98	2	* NV-RAM memory access on autcpu12
1da177e4 LT	3	* (C) 2002 Thomas Gleixner (gleixner@autronix.de)
1da177e4 LT	4	*
1da177e4 LT	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License as published by
	7	* the Free Software Foundation; either version 2 of the License, or
	8	* (at your option) any later version.
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU General Public License
	16	* along with this program; if not, write to the Free Software
	17	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	18	*
	19	*/
	20
	21	#include <linux/module.h>
	22	#include <linux/types.h>
	23	#include <linux/kernel.h>
	24	#include <linux/ioport.h>
	25	#include <linux/init.h>
	26	#include <asm/io.h>
	27	#include <asm/sizes.h>
a09e64fb RK	28	#include <mach/hardware.h>
a09e64fb RK	29	#include <mach/autcpu12.h>
1da177e4 LT	30	#include <linux/mtd/mtd.h>
	31	#include <linux/mtd/map.h>
	32	#include <linux/mtd/partitions.h>
	33
	34
	35	static struct mtd_info *sram_mtd;
	36
	37	struct map_info autcpu12_sram_map = {
	38	.name = "SRAM",
	39	.size = 32768,
	40	.bankwidth = 4,
	41	.phys = 0x12000000,
	42	};
	43
	44	static int __init init_autcpu12_sram (void)
	45	{
	46	int err, save0, save1;
	47
	48	autcpu12_sram_map.virt = ioremap(0x12000000, SZ_128K);
	49	if (!autcpu12_sram_map.virt) {
	50	printk("Failed to ioremap autcpu12 NV-RAM space\n");
	51	err = -EIO;
	52	goto out;
	53	}
	54	simple_map_init(&autcpu_sram_map);
	55
69f34c98 TG	56	/*
	57	* Check for 32K/128K
	58	* read ofs 0
	59	* read ofs 0x10000
1da177e4 LT	60	* Write complement to ofs 0x100000
	61	* Read and check result on ofs 0x0
	62	* Restore contents
	63	*/
	64	save0 = map_read32(&autcpu12_sram_map,0);
	65	save1 = map_read32(&autcpu12_sram_map,0x10000);
	66	map_write32(&autcpu12_sram_map,~save0,0x10000);
69f34c98	67	/* if we find this pattern on 0x0, we have 32K size
1da177e4 LT	68	* restore contents and exit
	69	*/
	70	if ( map_read32(&autcpu12_sram_map,0) != save0) {
	71	map_write32(&autcpu12_sram_map,save0,0x0);
	72	goto map;
	73	}
	74	/* We have a 128K found, restore 0x10000 and set size
	75	* to 128K
	76	*/
	77	map_write32(&autcpu12_sram_map,save1,0x10000);
	78	autcpu12_sram_map.size = SZ_128K;
	79
	80	map:
	81	sram_mtd = do_map_probe("map_ram", &autcpu12_sram_map);
	82	if (!sram_mtd) {
	83	printk("NV-RAM probe failed\n");
	84	err = -ENXIO;
	85	goto out_ioremap;
	86	}
	87
	88	sram_mtd->owner = THIS_MODULE;
	89	sram_mtd->erasesize = 16;
69f34c98	90
1da177e4 LT	91	if (add_mtd_device(sram_mtd)) {
	92	printk("NV-RAM device addition failed\n");
	93	err = -ENOMEM;
	94	goto out_probe;
	95	}
	96
	97	printk("NV-RAM device size %ldKiB registered on AUTCPU12\n",autcpu12_sram_map.size/SZ_1K);
69f34c98	98
1da177e4 LT	99	return 0;
	100
	101	out_probe:
	102	map_destroy(sram_mtd);
	103	sram_mtd = 0;
	104
	105	out_ioremap:
	106	iounmap((void *)autcpu12_sram_map.virt);
	107	out:
	108	return err;
	109	}
	110
	111	static void __exit cleanup_autcpu12_maps(void)
	112	{
	113	if (sram_mtd) {
	114	del_mtd_device(sram_mtd);
	115	map_destroy(sram_mtd);
	116	iounmap((void *)autcpu12_sram_map.virt);
	117	}
	118	}
	119
	120	module_init(init_autcpu12_sram);
	121	module_exit(cleanup_autcpu12_maps);
	122
	123	MODULE_AUTHOR("Thomas Gleixner");
	124	MODULE_DESCRIPTION("autcpu12 NV-RAM map driver");
	125	MODULE_LICENSE("GPL");