[linux-2.6-block.git] / drivers / mfd / syscon.c

/*
 * System Control Driver
 *
 * Copyright (C) 2012 Freescale Semiconductor, Inc.
 * Copyright (C) 2012 Linaro Ltd.
 *
 * Author: Dong Aisheng <dong.aisheng@linaro.org>
 *
 * 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.
 */

#include <linux/err.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/mfd/syscon.h>

static struct platform_driver syscon_driver;

struct syscon {
	struct regmap *regmap;
};

static int syscon_match_node(struct device *dev, void *data)
{
	struct device_node *dn = data;

	return (dev->of_node == dn) ? 1 : 0;
}

struct regmap *syscon_node_to_regmap(struct device_node *np)
{
	struct syscon *syscon;
	struct device *dev;

	dev = driver_find_device(&syscon_driver.driver, NULL, np,
				 syscon_match_node);
	if (!dev)
		return ERR_PTR(-EPROBE_DEFER);

	syscon = dev_get_drvdata(dev);

	return syscon->regmap;
}
EXPORT_SYMBOL_GPL(syscon_node_to_regmap);

struct regmap *syscon_regmap_lookup_by_compatible(const char *s)
{
	struct device_node *syscon_np;
	struct regmap *regmap;

	syscon_np = of_find_compatible_node(NULL, NULL, s);
	if (!syscon_np)
		return ERR_PTR(-ENODEV);

	regmap = syscon_node_to_regmap(syscon_np);
	of_node_put(syscon_np);

	return regmap;
}
EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_compatible);

static int syscon_match_pdevname(struct device *dev, void *data)
{
	return !strcmp(dev_name(dev), (const char *)data);
}

struct regmap *syscon_regmap_lookup_by_pdevname(const char *s)
{
	struct device *dev;
	struct syscon *syscon;

	dev = driver_find_device(&syscon_driver.driver, NULL, (void *)s,
				 syscon_match_pdevname);
	if (!dev)
		return ERR_PTR(-EPROBE_DEFER);

	syscon = dev_get_drvdata(dev);

	return syscon->regmap;
}
EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_pdevname);

struct regmap *syscon_regmap_lookup_by_phandle(struct device_node *np,
					const char *property)
{
	struct device_node *syscon_np;
	struct regmap *regmap;

	syscon_np = of_parse_phandle(np, property, 0);
	if (!syscon_np)
		return ERR_PTR(-ENODEV);

	regmap = syscon_node_to_regmap(syscon_np);
	of_node_put(syscon_np);

	return regmap;
}
EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_phandle);

static const struct of_device_id of_syscon_match[] = {
	{ .compatible = "syscon", },
	{ },
};

static struct regmap_config syscon_regmap_config = {
	.reg_bits = 32,
	.val_bits = 32,
	.reg_stride = 4,
};

static int syscon_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct syscon *syscon;
	struct resource *res;
	void __iomem *base;

	syscon = devm_kzalloc(dev, sizeof(*syscon), GFP_KERNEL);
	if (!syscon)
		return -ENOMEM;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res)
		return -ENOENT;

	base = devm_ioremap(dev, res->start, resource_size(res));
	if (!base)
		return -ENOMEM;

	syscon_regmap_config.max_register = res->end - res->start - 3;
	syscon->regmap = devm_regmap_init_mmio(dev, base,
					&syscon_regmap_config);
	if (IS_ERR(syscon->regmap)) {
		dev_err(dev, "regmap init failed\n");
		return PTR_ERR(syscon->regmap);
	}

	platform_set_drvdata(pdev, syscon);

	dev_dbg(dev, "regmap %pR registered\n", res);

	return 0;
}

static const struct platform_device_id syscon_ids[] = {
	{ "syscon", },
	{ }
};

static struct platform_driver syscon_driver = {
	.driver = {
		.name = "syscon",
		.owner = THIS_MODULE,
		.of_match_table = of_syscon_match,
	},
	.probe		= syscon_probe,
	.id_table	= syscon_ids,
};

static int __init syscon_init(void)
{
	return platform_driver_register(&syscon_driver);
}
postcore_initcall(syscon_init);

static void __exit syscon_exit(void)
{
	platform_driver_unregister(&syscon_driver);
}
module_exit(syscon_exit);

MODULE_AUTHOR("Dong Aisheng <dong.aisheng@linaro.org>");
MODULE_DESCRIPTION("System Control driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
87d68730 DA	1	/*
	2	* System Control Driver
	3	*
	4	* Copyright (C) 2012 Freescale Semiconductor, Inc.
	5	* Copyright (C) 2012 Linaro Ltd.
	6	*
	7	* Author: Dong Aisheng <dong.aisheng@linaro.org>
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License as published by
	11	* the Free Software Foundation; either version 2 of the License, or
	12	* (at your option) any later version.
	13	*/
	14
	15	#include <linux/err.h>
	16	#include <linux/io.h>
	17	#include <linux/module.h>
	18	#include <linux/of.h>
	19	#include <linux/of_address.h>
	20	#include <linux/of_platform.h>
	21	#include <linux/platform_device.h>
	22	#include <linux/regmap.h>
75177dee	23	#include <linux/mfd/syscon.h>
87d68730 DA	24
	25	static struct platform_driver syscon_driver;
	26
	27	struct syscon {
87d68730 DA	28	struct regmap *regmap;
	29	};
	30
5ab3a89a	31	static int syscon_match_node(struct device dev, void data)
87d68730	32	{
87d68730 DA	33	struct device_node *dn = data;
87d68730 DA	34
ed21465a	35	return (dev->of_node == dn) ? 1 : 0;
87d68730 DA	36	}
	37
	38	struct regmap syscon_node_to_regmap(struct device_node np)
	39	{
	40	struct syscon *syscon;
	41	struct device *dev;
	42
	43	dev = driver_find_device(&syscon_driver.driver, NULL, np,
5ab3a89a	44	syscon_match_node);
87d68730 DA	45	if (!dev)
	46	return ERR_PTR(-EPROBE_DEFER);
	47
	48	syscon = dev_get_drvdata(dev);
	49
	50	return syscon->regmap;
	51	}
	52	EXPORT_SYMBOL_GPL(syscon_node_to_regmap);
	53
	54	struct regmap syscon_regmap_lookup_by_compatible(const char s)
	55	{
	56	struct device_node *syscon_np;
	57	struct regmap *regmap;
	58
	59	syscon_np = of_find_compatible_node(NULL, NULL, s);
	60	if (!syscon_np)
	61	return ERR_PTR(-ENODEV);
	62
	63	regmap = syscon_node_to_regmap(syscon_np);
	64	of_node_put(syscon_np);
	65
	66	return regmap;
	67	}
	68	EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_compatible);
	69
5ab3a89a AS	70	static int syscon_match_pdevname(struct device dev, void data)
5ab3a89a AS	71	{
5ab3a89a AS	72	return !strcmp(dev_name(dev), (const char *)data);
	73	}
	74
	75	struct regmap syscon_regmap_lookup_by_pdevname(const char s)
	76	{
	77	struct device *dev;
	78	struct syscon *syscon;
	79
	80	dev = driver_find_device(&syscon_driver.driver, NULL, (void *)s,
	81	syscon_match_pdevname);
	82	if (!dev)
	83	return ERR_PTR(-EPROBE_DEFER);
	84
	85	syscon = dev_get_drvdata(dev);
	86
	87	return syscon->regmap;
	88	}
	89	EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_pdevname);
	90
87d68730 DA	91	struct regmap syscon_regmap_lookup_by_phandle(struct device_node np,
	92	const char *property)
	93	{
	94	struct device_node *syscon_np;
	95	struct regmap *regmap;
	96
	97	syscon_np = of_parse_phandle(np, property, 0);
	98	if (!syscon_np)
	99	return ERR_PTR(-ENODEV);
	100
	101	regmap = syscon_node_to_regmap(syscon_np);
	102	of_node_put(syscon_np);
	103
	104	return regmap;
	105	}
	106	EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_phandle);
	107
	108	static const struct of_device_id of_syscon_match[] = {
	109	{ .compatible = "syscon", },
	110	{ },
	111	};
	112
	113	static struct regmap_config syscon_regmap_config = {
	114	.reg_bits = 32,
	115	.val_bits = 32,
	116	.reg_stride = 4,
	117	};
	118
f791be49	119	static int syscon_probe(struct platform_device *pdev)
87d68730 DA	120	{
87d68730 DA	121	struct device *dev = &pdev->dev;
87d68730	122	struct syscon *syscon;
5ab3a89a	123	struct resource *res;
f10111cc	124	void __iomem *base;
87d68730	125
5ab3a89a	126	syscon = devm_kzalloc(dev, sizeof(*syscon), GFP_KERNEL);
87d68730 DA	127	if (!syscon)
	128	return -ENOMEM;
	129
5ab3a89a AS	130	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	131	if (!res)
	132	return -ENOENT;
87d68730	133
f10111cc AS	134	base = devm_ioremap(dev, res->start, resource_size(res));
f10111cc AS	135	if (!base)
5ab3a89a	136	return -ENOMEM;
87d68730	137
5ab3a89a	138	syscon_regmap_config.max_register = res->end - res->start - 3;
f10111cc	139	syscon->regmap = devm_regmap_init_mmio(dev, base,
87d68730 DA	140	&syscon_regmap_config);
	141	if (IS_ERR(syscon->regmap)) {
	142	dev_err(dev, "regmap init failed\n");
	143	return PTR_ERR(syscon->regmap);
	144	}
	145
87d68730 DA	146	platform_set_drvdata(pdev, syscon);
87d68730 DA	147
38d8974e	148	dev_dbg(dev, "regmap %pR registered\n", res);
87d68730 DA	149
	150	return 0;
	151	}
	152
5ab3a89a AS	153	static const struct platform_device_id syscon_ids[] = {
	154	{ "syscon", },
	155	{ }
	156	};
87d68730 DA	157
	158	static struct platform_driver syscon_driver = {
	159	.driver = {
	160	.name = "syscon",
	161	.owner = THIS_MODULE,
	162	.of_match_table = of_syscon_match,
	163	},
	164	.probe = syscon_probe,
5ab3a89a	165	.id_table = syscon_ids,
87d68730 DA	166	};
	167
	168	static int __init syscon_init(void)
	169	{
	170	return platform_driver_register(&syscon_driver);
	171	}
	172	postcore_initcall(syscon_init);
	173
	174	static void __exit syscon_exit(void)
	175	{
	176	platform_driver_unregister(&syscon_driver);
	177	}
	178	module_exit(syscon_exit);
	179
	180	MODULE_AUTHOR("Dong Aisheng <dong.aisheng@linaro.org>");
	181	MODULE_DESCRIPTION("System Control driver");
	182	MODULE_LICENSE("GPL v2");