[deliverable/linux.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 {
	void __iomem *base;
	struct regmap *regmap;
};

static int syscon_match(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);
	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);

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 device_node *np = dev->of_node;
	struct syscon *syscon;
	struct resource res;
	int ret;

	if (!np)
		return -ENOENT;

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

	syscon->base = of_iomap(np, 0);
	if (!syscon->base)
		return -EADDRNOTAVAIL;

	ret = of_address_to_resource(np, 0, &res);
	if (ret)
		return ret;

	syscon_regmap_config.max_register = res.end - res.start - 3;
	syscon->regmap = devm_regmap_init_mmio(dev, syscon->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_info(dev, "syscon regmap start 0x%x end 0x%x registered\n",
		res.start, res.end);

	return 0;
}

static int syscon_remove(struct platform_device *pdev)
{
	struct syscon *syscon;

	syscon = platform_get_drvdata(pdev);
	iounmap(syscon->base);
	platform_set_drvdata(pdev, NULL);

	return 0;
}

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

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	void __iomem *base;
	29	struct regmap *regmap;
	30	};
	31
	32	static int syscon_match(struct device dev, void data)
	33	{
87d68730 DA	34	struct device_node *dn = data;
87d68730 DA	35
ed21465a	36	return (dev->of_node == dn) ? 1 : 0;
87d68730 DA	37	}
	38
	39	struct regmap syscon_node_to_regmap(struct device_node np)
	40	{
	41	struct syscon *syscon;
	42	struct device *dev;
	43
	44	dev = driver_find_device(&syscon_driver.driver, NULL, np,
	45	syscon_match);
	46	if (!dev)
	47	return ERR_PTR(-EPROBE_DEFER);
	48
	49	syscon = dev_get_drvdata(dev);
	50
	51	return syscon->regmap;
	52	}
	53	EXPORT_SYMBOL_GPL(syscon_node_to_regmap);
	54
	55	struct regmap syscon_regmap_lookup_by_compatible(const char s)
	56	{
	57	struct device_node *syscon_np;
	58	struct regmap *regmap;
	59
	60	syscon_np = of_find_compatible_node(NULL, NULL, s);
	61	if (!syscon_np)
	62	return ERR_PTR(-ENODEV);
	63
	64	regmap = syscon_node_to_regmap(syscon_np);
	65	of_node_put(syscon_np);
	66
	67	return regmap;
	68	}
	69	EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_compatible);
	70
	71	struct regmap syscon_regmap_lookup_by_phandle(struct device_node np,
	72	const char *property)
	73	{
	74	struct device_node *syscon_np;
	75	struct regmap *regmap;
	76
	77	syscon_np = of_parse_phandle(np, property, 0);
	78	if (!syscon_np)
	79	return ERR_PTR(-ENODEV);
	80
	81	regmap = syscon_node_to_regmap(syscon_np);
	82	of_node_put(syscon_np);
	83
	84	return regmap;
	85	}
	86	EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_phandle);
	87
	88	static const struct of_device_id of_syscon_match[] = {
	89	{ .compatible = "syscon", },
	90	{ },
	91	};
	92
	93	static struct regmap_config syscon_regmap_config = {
	94	.reg_bits = 32,
	95	.val_bits = 32,
	96	.reg_stride = 4,
	97	};
	98
f791be49	99	static int syscon_probe(struct platform_device *pdev)
87d68730 DA	100	{
	101	struct device *dev = &pdev->dev;
	102	struct device_node *np = dev->of_node;
	103	struct syscon *syscon;
	104	struct resource res;
	105	int ret;
	106
	107	if (!np)
	108	return -ENOENT;
	109
	110	syscon = devm_kzalloc(dev, sizeof(struct syscon),
	111	GFP_KERNEL);
	112	if (!syscon)
	113	return -ENOMEM;
	114
	115	syscon->base = of_iomap(np, 0);
	116	if (!syscon->base)
	117	return -EADDRNOTAVAIL;
	118
	119	ret = of_address_to_resource(np, 0, &res);
	120	if (ret)
	121	return ret;
	122
	123	syscon_regmap_config.max_register = res.end - res.start - 3;
	124	syscon->regmap = devm_regmap_init_mmio(dev, syscon->base,
	125	&syscon_regmap_config);
	126	if (IS_ERR(syscon->regmap)) {
	127	dev_err(dev, "regmap init failed\n");
	128	return PTR_ERR(syscon->regmap);
	129	}
	130
87d68730 DA	131	platform_set_drvdata(pdev, syscon);
	132
	133	dev_info(dev, "syscon regmap start 0x%x end 0x%x registered\n",
	134	res.start, res.end);
	135
	136	return 0;
	137	}
	138
4740f73f	139	static int syscon_remove(struct platform_device *pdev)
87d68730 DA	140	{
	141	struct syscon *syscon;
	142
	143	syscon = platform_get_drvdata(pdev);
	144	iounmap(syscon->base);
	145	platform_set_drvdata(pdev, NULL);
	146
	147	return 0;
	148	}
	149
	150	static struct platform_driver syscon_driver = {
	151	.driver = {
	152	.name = "syscon",
	153	.owner = THIS_MODULE,
	154	.of_match_table = of_syscon_match,
	155	},
	156	.probe = syscon_probe,
84449216	157	.remove = syscon_remove,
87d68730 DA	158	};
	159
	160	static int __init syscon_init(void)
	161	{
	162	return platform_driver_register(&syscon_driver);
	163	}
	164	postcore_initcall(syscon_init);
	165
	166	static void __exit syscon_exit(void)
	167	{
	168	platform_driver_unregister(&syscon_driver);
	169	}
	170	module_exit(syscon_exit);
	171
	172	MODULE_AUTHOR("Dong Aisheng <dong.aisheng@linaro.org>");
	173	MODULE_DESCRIPTION("System Control driver");
	174	MODULE_LICENSE("GPL v2");