[deliverable/linux.git] / drivers / mtd / maps / bast-flash.c

/* linux/drivers/mtd/maps/bast_flash.c
 *
 * Copyright (c) 2004-2005 Simtec Electronics
 *	Ben Dooks <ben@simtec.co.uk>
 *
 * Simtec Bast (EB2410ITX) NOR MTD Mapping driver
 *
 * Changelog:
 *	20-Sep-2004  BJD  Initial version
 *	17-Jan-2005  BJD  Add whole device if no partitions found
 *
 * $Id: bast-flash.c,v 1.2 2005/01/18 11:13:47 bjd 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/init.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/ioport.h>
#include <linux/device.h>
#include <linux/slab.h>

#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/partitions.h>

#include <asm/io.h>
#include <asm/mach/flash.h>

#include <asm/arch/map.h>
#include <asm/arch/bast-map.h>
#include <asm/arch/bast-cpld.h>

#ifdef CONFIG_MTD_BAST_MAXSIZE
#define AREA_MAXSIZE (CONFIG_MTD_BAST_MAXSIZE * SZ_1M)
#else
#define AREA_MAXSIZE (32 * SZ_1M)
#endif

#define PFX "bast-flash: "

struct bast_flash_info {
	struct mtd_info		*mtd;
	struct map_info		 map;
	struct mtd_partition	*partitions;
	struct resource		*area;
};

static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };

static struct bast_flash_info *to_bast_info(struct device *dev)
{
	return (struct bast_flash_info *)dev_get_drvdata(dev);
}

static void bast_flash_setrw(int to)
{
	unsigned int val;
	unsigned long flags;

	local_irq_save(flags);
	val = __raw_readb(BAST_VA_CTRL3);
	
	if (to)
		val |= BAST_CPLD_CTRL3_ROMWEN;
	else
		val &= ~BAST_CPLD_CTRL3_ROMWEN;

	pr_debug("new cpld ctrl3=%02x\n", val);

	__raw_writeb(val, BAST_VA_CTRL3);
	local_irq_restore(flags);
}

static int bast_flash_remove(struct device *dev)
{
	struct bast_flash_info *info = to_bast_info(dev);

	dev_set_drvdata(dev, NULL);

	if (info == NULL) 
		return 0;

	if (info->map.virt != NULL)
		iounmap(info->map.virt);

	if (info->mtd) {
		del_mtd_partitions(info->mtd);
		map_destroy(info->mtd);
	}

	if (info->partitions)
		kfree(info->partitions);

	if (info->area) {
		release_resource(info->area);
		kfree(info->area);
	}
	
	kfree(info);

	return 0;
}

static int bast_flash_probe(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct bast_flash_info *info;
	struct resource *res;
	int err = 0;

	info = kmalloc(sizeof(*info), GFP_KERNEL);
	if (info == NULL) {
		printk(KERN_ERR PFX "no memory for flash info\n");
		err = -ENOMEM;
		goto exit_error;
	}

	memzero(info, sizeof(*info));
	dev_set_drvdata(dev, info);

	res = pdev->resource;  /* assume that the flash has one resource */

	info->map.phys = res->start;
	info->map.size = res->end - res->start + 1;
	info->map.name = dev->bus_id;	
	info->map.bankwidth = 2;
	
	if (info->map.size > AREA_MAXSIZE)
		info->map.size = AREA_MAXSIZE;

	pr_debug("%s: area %08lx, size %ld\n", __FUNCTION__,
		 info->map.phys, info->map.size);
	
	info->area = request_mem_region(res->start, info->map.size,
					pdev->name);
	if (info->area == NULL) {
		printk(KERN_ERR PFX "cannot reserve flash memory region\n");
		err = -ENOENT;
		goto exit_error;
	}

	info->map.virt = ioremap(res->start, info->map.size);
	pr_debug("%s: virt at %08x\n", __FUNCTION__, (int)info->map.virt);

	if (info->map.virt == 0) {
		printk(KERN_ERR PFX "failed to ioremap() region\n");
		err = -EIO;
		goto exit_error;
	}
 
	simple_map_init(&info->map);

	/* enable the write to the flash area */

	bast_flash_setrw(1);

	/* probe for the device(s) */

	info->mtd = do_map_probe("jedec_probe", &info->map);
	if (info->mtd == NULL)
		info->mtd = do_map_probe("cfi_probe", &info->map);

	if (info->mtd == NULL) {
		printk(KERN_ERR PFX "map_probe() failed\n");
		err = -ENXIO;
		goto exit_error;
	}

	/* mark ourselves as the owner */
	info->mtd->owner = THIS_MODULE;

	err = parse_mtd_partitions(info->mtd, probes, &info->partitions, 0);
	if (err > 0) {
		err = add_mtd_partitions(info->mtd, info->partitions, err);
		if (err) 
			printk(KERN_ERR PFX "cannot add/parse partitions\n");
	} else {
		err = add_mtd_device(info->mtd);
	}

	if (err == 0)
		return 0;

	/* fall through to exit error */

 exit_error:
	bast_flash_remove(dev);
	return err;
}

static struct device_driver bast_flash_driver = {
	.name		= "bast-nor",
	.bus		= &platform_bus_type,
	.probe		= bast_flash_probe,
	.remove		= bast_flash_remove,
};

static int __init bast_flash_init(void)
{
	printk("BAST NOR-Flash Driver, (c) 2004 Simtec Electronics\n");
	return driver_register(&bast_flash_driver);
}

static void __exit bast_flash_exit(void)
{
	driver_unregister(&bast_flash_driver);
}

module_init(bast_flash_init);
module_exit(bast_flash_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
MODULE_DESCRIPTION("BAST MTD Map driver");
Commit	Line	Data
1da177e4 LT	1	/* linux/drivers/mtd/maps/bast_flash.c
1da177e4 LT	2	*
6fc93d8c BD	3	* Copyright (c) 2004-2005 Simtec Electronics
6fc93d8c BD	4	* Ben Dooks <ben@simtec.co.uk>
1da177e4 LT	5	*
	6	* Simtec Bast (EB2410ITX) NOR MTD Mapping driver
	7	*
	8	* Changelog:
	9	* 20-Sep-2004 BJD Initial version
6fc93d8c	10	* 17-Jan-2005 BJD Add whole device if no partitions found
1da177e4	11	*
6fc93d8c	12	* $Id: bast-flash.c,v 1.2 2005/01/18 11:13:47 bjd Exp $
1da177e4 LT	13	*
	14	* This program is free software; you can redistribute it and/or modify
	15	* it under the terms of the GNU General Public License as published by
	16	* the Free Software Foundation; either version 2 of the License, or
	17	* (at your option) any later version.
	18	*
	19	* This program is distributed in the hope that it will be useful,
	20	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	21	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	22	* GNU General Public License for more details.
	23	*
	24	* You should have received a copy of the GNU General Public License
	25	* along with this program; if not, write to the Free Software
	26	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	27	*/
	28
	29	#include <linux/module.h>
	30	#include <linux/types.h>
	31	#include <linux/init.h>
	32	#include <linux/kernel.h>
	33	#include <linux/string.h>
	34	#include <linux/ioport.h>
	35	#include <linux/device.h>
4e57b681	36	#include <linux/slab.h>
1da177e4 LT	37
	38	#include <linux/mtd/mtd.h>
	39	#include <linux/mtd/map.h>
	40	#include <linux/mtd/partitions.h>
	41
	42	#include <asm/io.h>
1da177e4 LT	43	#include <asm/mach/flash.h>
	44
	45	#include <asm/arch/map.h>
	46	#include <asm/arch/bast-map.h>
	47	#include <asm/arch/bast-cpld.h>
	48
	49	#ifdef CONFIG_MTD_BAST_MAXSIZE
6fc93d8c	50	#define AREA_MAXSIZE (CONFIG_MTD_BAST_MAXSIZE * SZ_1M)
1da177e4	51	#else
6fc93d8c	52	#define AREA_MAXSIZE (32 * SZ_1M)
1da177e4 LT	53	#endif
	54
	55	#define PFX "bast-flash: "
	56
	57	struct bast_flash_info {
	58	struct mtd_info *mtd;
	59	struct map_info map;
	60	struct mtd_partition *partitions;
	61	struct resource *area;
	62	};
	63
	64	static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
	65
	66	static struct bast_flash_info to_bast_info(struct device dev)
	67	{
	68	return (struct bast_flash_info *)dev_get_drvdata(dev);
	69	}
	70
	71	static void bast_flash_setrw(int to)
	72	{
	73	unsigned int val;
	74	unsigned long flags;
	75
	76	local_irq_save(flags);
	77	val = __raw_readb(BAST_VA_CTRL3);
	78
	79	if (to)
	80	val \|= BAST_CPLD_CTRL3_ROMWEN;
	81	else
	82	val &= ~BAST_CPLD_CTRL3_ROMWEN;
	83
	84	pr_debug("new cpld ctrl3=%02x\n", val);
	85
	86	__raw_writeb(val, BAST_VA_CTRL3);
	87	local_irq_restore(flags);
	88	}
	89
	90	static int bast_flash_remove(struct device *dev)
	91	{
	92	struct bast_flash_info *info = to_bast_info(dev);
	93
	94	dev_set_drvdata(dev, NULL);
	95
	96	if (info == NULL)
	97	return 0;
	98
	99	if (info->map.virt != NULL)
	100	iounmap(info->map.virt);
	101
	102	if (info->mtd) {
	103	del_mtd_partitions(info->mtd);
	104	map_destroy(info->mtd);
	105	}
	106
	107	if (info->partitions)
	108	kfree(info->partitions);
	109
	110	if (info->area) {
	111	release_resource(info->area);
	112	kfree(info->area);
	113	}
	114
	115	kfree(info);
	116
117	return 0;
118	}
119
120	static int bast_flash_probe(struct device *dev)
121	{
122	struct platform_device *pdev = to_platform_device(dev);
123	struct bast_flash_info *info;
124	struct resource *res;
125	int err = 0;
126
127	info = kmalloc(sizeof(*info), GFP_KERNEL);
128	if (info == NULL) {
129	printk(KERN_ERR PFX "no memory for flash info\n");
130	err = -ENOMEM;
131	goto exit_error;
132	}
133
134	memzero(info, sizeof(*info));
135	dev_set_drvdata(dev, info);
136
137	res = pdev->resource; /* assume that the flash has one resource */
138
139	info->map.phys = res->start;
140	info->map.size = res->end - res->start + 1;
141	info->map.name = dev->bus_id;
142	info->map.bankwidth = 2;
143
144	if (info->map.size > AREA_MAXSIZE)
145	info->map.size = AREA_MAXSIZE;
146
147	pr_debug("%s: area %08lx, size %ld\n", __FUNCTION__,
148	info->map.phys, info->map.size);
149
150	info->area = request_mem_region(res->start, info->map.size,
151	pdev->name);
152	if (info->area == NULL) {
153	printk(KERN_ERR PFX "cannot reserve flash memory region\n");
154	err = -ENOENT;
155	goto exit_error;
156	}
157
158	info->map.virt = ioremap(res->start, info->map.size);
159	pr_debug("%s: virt at %08x\n", __FUNCTION__, (int)info->map.virt);
160
161	if (info->map.virt == 0) {
162	printk(KERN_ERR PFX "failed to ioremap() region\n");
163	err = -EIO;
164	goto exit_error;
165	}
166
167	simple_map_init(&info->map);
168
169	/* enable the write to the flash area */
170
171	bast_flash_setrw(1);
172
173	/* probe for the device(s) */
174
175	info->mtd = do_map_probe("jedec_probe", &info->map);
176	if (info->mtd == NULL)
177	info->mtd = do_map_probe("cfi_probe", &info->map);
178
179	if (info->mtd == NULL) {
180	printk(KERN_ERR PFX "map_probe() failed\n");
181	err = -ENXIO;
182	goto exit_error;
183	}
184
185	/* mark ourselves as the owner */
186	info->mtd->owner = THIS_MODULE;
187
188	err = parse_mtd_partitions(info->mtd, probes, &info->partitions, 0);
189	if (err > 0) {
190	err = add_mtd_partitions(info->mtd, info->partitions, err);
191	if (err)
192	printk(KERN_ERR PFX "cannot add/parse partitions\n");
6fc93d8c BD	193	} else {
6fc93d8c BD	194	err = add_mtd_device(info->mtd);
1da177e4 LT	195	}
	196
	197	if (err == 0)
	198	return 0;
	199
	200	/* fall through to exit error */
	201
	202	exit_error:
	203	bast_flash_remove(dev);
	204	return err;
	205	}
	206
	207	static struct device_driver bast_flash_driver = {
	208	.name = "bast-nor",
	209	.bus = &platform_bus_type,
	210	.probe = bast_flash_probe,
	211	.remove = bast_flash_remove,
	212	};
	213
	214	static int __init bast_flash_init(void)
	215	{
	216	printk("BAST NOR-Flash Driver, (c) 2004 Simtec Electronics\n");
	217	return driver_register(&bast_flash_driver);
	218	}
	219
	220	static void __exit bast_flash_exit(void)
	221	{
	222	driver_unregister(&bast_flash_driver);
	223	}
	224
	225	module_init(bast_flash_init);
	226	module_exit(bast_flash_exit);
	227
	228	MODULE_LICENSE("GPL");
	229	MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
	230	MODULE_DESCRIPTION("BAST MTD Map driver");