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

/*
 * Interface for NOR flash driver whose high address lines are latched
 *
 * Copyright © 2000 Nicolas Pitre <nico@cam.org>
 * Copyright © 2005-2008 Analog Devices Inc.
 * Copyright © 2008 MontaVista Software, Inc. <source@mvista.com>
 *
 * This file is licensed under the terms of the GNU General Public License
 * version 2. This program is licensed "as is" without any warranty of any
 * kind, whether express or implied.
 */

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/partitions.h>
#include <linux/platform_device.h>
#include <linux/mtd/latch-addr-flash.h>
#include <linux/slab.h>

#define DRIVER_NAME "latch-addr-flash"

struct latch_addr_flash_info {
	struct mtd_info		*mtd;
	struct map_info		map;
	struct resource		*res;

	void			(*set_window)(unsigned long offset, void *data);
	void			*data;

	/* cache; could be found out of res */
	unsigned long		win_mask;

	int			nr_parts;
	struct mtd_partition	*parts;

	spinlock_t		lock;
};

static map_word lf_read(struct map_info *map, unsigned long ofs)
{
	struct latch_addr_flash_info *info;
	map_word datum;

	info = (struct latch_addr_flash_info *)map->map_priv_1;

	spin_lock(&info->lock);

	info->set_window(ofs, info->data);
	datum = inline_map_read(map, info->win_mask & ofs);

	spin_unlock(&info->lock);

	return datum;
}

static void lf_write(struct map_info *map, map_word datum, unsigned long ofs)
{
	struct latch_addr_flash_info *info;

	info = (struct latch_addr_flash_info *)map->map_priv_1;

	spin_lock(&info->lock);

	info->set_window(ofs, info->data);
	inline_map_write(map, datum, info->win_mask & ofs);

	spin_unlock(&info->lock);
}

static void lf_copy_from(struct map_info *map, void *to,
		unsigned long from, ssize_t len)
{
	struct latch_addr_flash_info *info =
		(struct latch_addr_flash_info *) map->map_priv_1;
	unsigned n;

	while (len > 0) {
		n = info->win_mask + 1 - (from & info->win_mask);
		if (n > len)
			n = len;

		spin_lock(&info->lock);

		info->set_window(from, info->data);
		memcpy_fromio(to, map->virt + (from & info->win_mask), n);

		spin_unlock(&info->lock);

		to += n;
		from += n;
		len -= n;
	}
}

static char *rom_probe_types[] = { "cfi_probe", NULL };

static char *part_probe_types[] = { "cmdlinepart", NULL };

static int latch_addr_flash_remove(struct platform_device *dev)
{
	struct latch_addr_flash_info *info;
	struct latch_addr_flash_data *latch_addr_data;

	info = platform_get_drvdata(dev);
	if (info == NULL)
		return 0;
	platform_set_drvdata(dev, NULL);

	latch_addr_data = dev->dev.platform_data;

	if (info->mtd != NULL) {
		if (info->nr_parts)
			kfree(info->parts);
		mtd_device_unregister(info->mtd);
		map_destroy(info->mtd);
	}

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

	if (info->res != NULL)
		release_mem_region(info->res->start, resource_size(info->res));

	kfree(info);

	if (latch_addr_data->done)
		latch_addr_data->done(latch_addr_data->data);

	return 0;
}

static int __devinit latch_addr_flash_probe(struct platform_device *dev)
{
	struct latch_addr_flash_data *latch_addr_data;
	struct latch_addr_flash_info *info;
	resource_size_t win_base = dev->resource->start;
	resource_size_t win_size = resource_size(dev->resource);
	char **probe_type;
	int chipsel;
	int err;

	latch_addr_data = dev->dev.platform_data;
	if (latch_addr_data == NULL)
		return -ENODEV;

	pr_notice("latch-addr platform flash device: %#llx byte "
		  "window at %#.8llx\n",
		  (unsigned long long)win_size, (unsigned long long)win_base);

	chipsel = dev->id;

	if (latch_addr_data->init) {
		err = latch_addr_data->init(latch_addr_data->data, chipsel);
		if (err != 0)
			return err;
	}

	info = kzalloc(sizeof(struct latch_addr_flash_info), GFP_KERNEL);
	if (info == NULL) {
		err = -ENOMEM;
		goto done;
	}

	platform_set_drvdata(dev, info);

	info->res = request_mem_region(win_base, win_size, DRIVER_NAME);
	if (info->res == NULL) {
		dev_err(&dev->dev, "Could not reserve memory region\n");
		err = -EBUSY;
		goto free_info;
	}

	info->map.name		= DRIVER_NAME;
	info->map.size		= latch_addr_data->size;
	info->map.bankwidth	= latch_addr_data->width;

	info->map.phys		= NO_XIP;
	info->map.virt		= ioremap(win_base, win_size);
	if (!info->map.virt) {
		err = -ENOMEM;
		goto free_res;
	}

	info->map.map_priv_1	= (unsigned long)info;

	info->map.read		= lf_read;
	info->map.copy_from	= lf_copy_from;
	info->map.write		= lf_write;
	info->set_window	= latch_addr_data->set_window;
	info->data		= latch_addr_data->data;
	info->win_mask		= win_size - 1;

	spin_lock_init(&info->lock);

	for (probe_type = rom_probe_types; !info->mtd && *probe_type;
		probe_type++)
		info->mtd = do_map_probe(*probe_type, &info->map);

	if (info->mtd == NULL) {
		dev_err(&dev->dev, "map_probe failed\n");
		err = -ENODEV;
		goto iounmap;
	}
	info->mtd->owner = THIS_MODULE;

	err = parse_mtd_partitions(info->mtd, (const char **)part_probe_types,
				   &info->parts, 0);
	if (err > 0) {
		mtd_device_register(info->mtd, info->parts, err);
		return 0;
	}
	if (latch_addr_data->nr_parts) {
		pr_notice("Using latch-addr-flash partition information\n");
		mtd_device_register(info->mtd,
				    latch_addr_data->parts,
				    latch_addr_data->nr_parts);
		return 0;
	}

	mtd_device_register(info->mtd, NULL, 0);
	return 0;

iounmap:
	iounmap(info->map.virt);
free_res:
	release_mem_region(info->res->start, resource_size(info->res));
free_info:
	kfree(info);
done:
	if (latch_addr_data->done)
		latch_addr_data->done(latch_addr_data->data);
	return err;
}

static struct platform_driver latch_addr_flash_driver = {
	.probe		= latch_addr_flash_probe,
	.remove		= __devexit_p(latch_addr_flash_remove),
	.driver		= {
		.name	= DRIVER_NAME,
	},
};

static int __init latch_addr_flash_init(void)
{
	return platform_driver_register(&latch_addr_flash_driver);
}
module_init(latch_addr_flash_init);

static void __exit latch_addr_flash_exit(void)
{
	platform_driver_unregister(&latch_addr_flash_driver);
}
module_exit(latch_addr_flash_exit);

MODULE_AUTHOR("David Griego <dgriego@mvista.com>");
MODULE_DESCRIPTION("MTD map driver for flashes addressed physically with upper "
		"address lines being set board specifically");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
dcfb81d6 DG	1	/*
	2	* Interface for NOR flash driver whose high address lines are latched
	3	*
	4	* Copyright © 2000 Nicolas Pitre <nico@cam.org>
	5	* Copyright © 2005-2008 Analog Devices Inc.
	6	* Copyright © 2008 MontaVista Software, Inc. <source@mvista.com>
	7	*
	8	* This file is licensed under the terms of the GNU General Public License
	9	* version 2. This program is licensed "as is" without any warranty of any
	10	* kind, whether express or implied.
	11	*/
	12
	13	#include <linux/init.h>
	14	#include <linux/kernel.h>
	15	#include <linux/module.h>
	16	#include <linux/mtd/mtd.h>
	17	#include <linux/mtd/map.h>
	18	#include <linux/mtd/partitions.h>
	19	#include <linux/platform_device.h>
	20	#include <linux/mtd/latch-addr-flash.h>
	21	#include <linux/slab.h>
	22
	23	#define DRIVER_NAME "latch-addr-flash"
	24
	25	struct latch_addr_flash_info {
	26	struct mtd_info *mtd;
	27	struct map_info map;
	28	struct resource *res;
	29
	30	void (set_window)(unsigned long offset, void data);
	31	void *data;
	32
	33	/* cache; could be found out of res */
	34	unsigned long win_mask;
	35
	36	int nr_parts;
	37	struct mtd_partition *parts;
	38
	39	spinlock_t lock;
	40	};
	41
	42	static map_word lf_read(struct map_info *map, unsigned long ofs)
	43	{
	44	struct latch_addr_flash_info *info;
	45	map_word datum;
	46
	47	info = (struct latch_addr_flash_info *)map->map_priv_1;
	48
	49	spin_lock(&info->lock);
	50
	51	info->set_window(ofs, info->data);
	52	datum = inline_map_read(map, info->win_mask & ofs);
	53
	54	spin_unlock(&info->lock);
	55
	56	return datum;
	57	}
	58
	59	static void lf_write(struct map_info *map, map_word datum, unsigned long ofs)
	60	{
	61	struct latch_addr_flash_info *info;
	62
	63	info = (struct latch_addr_flash_info *)map->map_priv_1;
	64
65	spin_lock(&info->lock);
66
67	info->set_window(ofs, info->data);
68	inline_map_write(map, datum, info->win_mask & ofs);
69
70	spin_unlock(&info->lock);
71	}
72
73	static void lf_copy_from(struct map_info map, void to,
74	unsigned long from, ssize_t len)
75	{
76	struct latch_addr_flash_info *info =
77	(struct latch_addr_flash_info *) map->map_priv_1;
78	unsigned n;
79
80	while (len > 0) {
81	n = info->win_mask + 1 - (from & info->win_mask);
82	if (n > len)
83	n = len;
84
85	spin_lock(&info->lock);
86
87	info->set_window(from, info->data);
88	memcpy_fromio(to, map->virt + (from & info->win_mask), n);
89
90	spin_unlock(&info->lock);
91
92	to += n;
93	from += n;
94	len -= n;
95	}
96	}
97
98	static char *rom_probe_types[] = { "cfi_probe", NULL };
99
100	static char *part_probe_types[] = { "cmdlinepart", NULL };
101
102	static int latch_addr_flash_remove(struct platform_device *dev)
103	{
104	struct latch_addr_flash_info *info;
105	struct latch_addr_flash_data *latch_addr_data;
106
107	info = platform_get_drvdata(dev);
108	if (info == NULL)
109	return 0;
110	platform_set_drvdata(dev, NULL);
111
112	latch_addr_data = dev->dev.platform_data;
113
114	if (info->mtd != NULL) {
902766bf JI	115	if (info->nr_parts)
	116	kfree(info->parts);
	117	mtd_device_unregister(info->mtd);
dcfb81d6 DG	118	map_destroy(info->mtd);
	119	}
	120
	121	if (info->map.virt != NULL)
	122	iounmap(info->map.virt);
	123
	124	if (info->res != NULL)
	125	release_mem_region(info->res->start, resource_size(info->res));
	126
	127	kfree(info);
	128
	129	if (latch_addr_data->done)
	130	latch_addr_data->done(latch_addr_data->data);
	131
	132	return 0;
	133	}
	134
	135	static int __devinit latch_addr_flash_probe(struct platform_device *dev)
	136	{
	137	struct latch_addr_flash_data *latch_addr_data;
	138	struct latch_addr_flash_info *info;
	139	resource_size_t win_base = dev->resource->start;
	140	resource_size_t win_size = resource_size(dev->resource);
	141	char **probe_type;
	142	int chipsel;
	143	int err;
	144
	145	latch_addr_data = dev->dev.platform_data;
	146	if (latch_addr_data == NULL)
	147	return -ENODEV;
	148
	149	pr_notice("latch-addr platform flash device: %#llx byte "
	150	"window at %#.8llx\n",
	151	(unsigned long long)win_size, (unsigned long long)win_base);
	152
	153	chipsel = dev->id;
	154
	155	if (latch_addr_data->init) {
	156	err = latch_addr_data->init(latch_addr_data->data, chipsel);
	157	if (err != 0)
	158	return err;
	159	}
	160
	161	info = kzalloc(sizeof(struct latch_addr_flash_info), GFP_KERNEL);
	162	if (info == NULL) {
	163	err = -ENOMEM;
	164	goto done;
	165	}
	166
	167	platform_set_drvdata(dev, info);
	168
	169	info->res = request_mem_region(win_base, win_size, DRIVER_NAME);
	170	if (info->res == NULL) {
	171	dev_err(&dev->dev, "Could not reserve memory region\n");
	172	err = -EBUSY;
	173	goto free_info;
	174	}
	175
	176	info->map.name = DRIVER_NAME;
	177	info->map.size = latch_addr_data->size;
	178	info->map.bankwidth = latch_addr_data->width;
	179
	180	info->map.phys = NO_XIP;
	181	info->map.virt = ioremap(win_base, win_size);
182	if (!info->map.virt) {
183	err = -ENOMEM;
184	goto free_res;
185	}
186
187	info->map.map_priv_1 = (unsigned long)info;
188
189	info->map.read = lf_read;
190	info->map.copy_from = lf_copy_from;
191	info->map.write = lf_write;
192	info->set_window = latch_addr_data->set_window;
193	info->data = latch_addr_data->data;
194	info->win_mask = win_size - 1;
195
196	spin_lock_init(&info->lock);
197
198	for (probe_type = rom_probe_types; !info->mtd && *probe_type;
199	probe_type++)
200	info->mtd = do_map_probe(*probe_type, &info->map);
201
202	if (info->mtd == NULL) {
203	dev_err(&dev->dev, "map_probe failed\n");
204	err = -ENODEV;
205	goto iounmap;
206	}
207	info->mtd->owner = THIS_MODULE;
208
902766bf JI	209	err = parse_mtd_partitions(info->mtd, (const char **)part_probe_types,
	210	&info->parts, 0);
	211	if (err > 0) {
	212	mtd_device_register(info->mtd, info->parts, err);
	213	return 0;
	214	}
	215	if (latch_addr_data->nr_parts) {
	216	pr_notice("Using latch-addr-flash partition information\n");
	217	mtd_device_register(info->mtd,
	218	latch_addr_data->parts,
	219	latch_addr_data->nr_parts);
	220	return 0;
dcfb81d6	221	}
902766bf JI	222
902766bf JI	223	mtd_device_register(info->mtd, NULL, 0);
dcfb81d6 DG	224	return 0;
	225
	226	iounmap:
	227	iounmap(info->map.virt);
	228	free_res:
	229	release_mem_region(info->res->start, resource_size(info->res));
	230	free_info:
	231	kfree(info);
	232	done:
	233	if (latch_addr_data->done)
	234	latch_addr_data->done(latch_addr_data->data);
	235	return err;
	236	}
	237
	238	static struct platform_driver latch_addr_flash_driver = {
	239	.probe = latch_addr_flash_probe,
	240	.remove = __devexit_p(latch_addr_flash_remove),
	241	.driver = {
	242	.name = DRIVER_NAME,
	243	},
	244	};
	245
	246	static int __init latch_addr_flash_init(void)
	247	{
	248	return platform_driver_register(&latch_addr_flash_driver);
	249	}
	250	module_init(latch_addr_flash_init);
	251
	252	static void __exit latch_addr_flash_exit(void)
	253	{
	254	platform_driver_unregister(&latch_addr_flash_driver);
	255	}
	256	module_exit(latch_addr_flash_exit);
	257
	258	MODULE_AUTHOR("David Griego <dgriego@mvista.com>");
	259	MODULE_DESCRIPTION("MTD map driver for flashes addressed physically with upper "
	260	"address lines being set board specifically");
	261	MODULE_LICENSE("GPL v2");