[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_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)
{
	struct platform_device *pdev = to_platform_device(dev);
	const struct platform_device_id *id = platform_get_device_id(pdev);

	if (id)
		if (!strcmp(id->name, (const char *)data))
			return 1;

	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;

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

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

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

	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, "regmap 0x%x-0x%x registered\n", res->start, res->end);

	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	void __iomem *base;
	29	struct regmap *regmap;
	30	};
	31
5ab3a89a	32	static int syscon_match_node(struct device dev, void data)
87d68730	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,
5ab3a89a	45	syscon_match_node);
87d68730 DA	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
5ab3a89a AS	71	static int syscon_match_pdevname(struct device dev, void data)
	72	{
	73	struct platform_device *pdev = to_platform_device(dev);
	74	const struct platform_device_id *id = platform_get_device_id(pdev);
	75
	76	if (id)
	77	if (!strcmp(id->name, (const char *)data))
	78	return 1;
	79
	80	return !strcmp(dev_name(dev), (const char *)data);
	81	}
	82
	83	struct regmap syscon_regmap_lookup_by_pdevname(const char s)
	84	{
	85	struct device *dev;
	86	struct syscon *syscon;
	87
	88	dev = driver_find_device(&syscon_driver.driver, NULL, (void *)s,
	89	syscon_match_pdevname);
	90	if (!dev)
	91	return ERR_PTR(-EPROBE_DEFER);
	92
	93	syscon = dev_get_drvdata(dev);
	94
	95	return syscon->regmap;
	96	}
	97	EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_pdevname);
	98
87d68730 DA	99	struct regmap syscon_regmap_lookup_by_phandle(struct device_node np,
	100	const char *property)
	101	{
	102	struct device_node *syscon_np;
	103	struct regmap *regmap;
	104
	105	syscon_np = of_parse_phandle(np, property, 0);
	106	if (!syscon_np)
	107	return ERR_PTR(-ENODEV);
	108
	109	regmap = syscon_node_to_regmap(syscon_np);
	110	of_node_put(syscon_np);
	111
	112	return regmap;
	113	}
	114	EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_phandle);
	115
	116	static const struct of_device_id of_syscon_match[] = {
	117	{ .compatible = "syscon", },
	118	{ },
	119	};
	120
	121	static struct regmap_config syscon_regmap_config = {
	122	.reg_bits = 32,
	123	.val_bits = 32,
	124	.reg_stride = 4,
	125	};
	126
f791be49	127	static int syscon_probe(struct platform_device *pdev)
87d68730 DA	128	{
87d68730 DA	129	struct device *dev = &pdev->dev;
87d68730	130	struct syscon *syscon;
5ab3a89a	131	struct resource *res;
87d68730	132
5ab3a89a	133	syscon = devm_kzalloc(dev, sizeof(*syscon), GFP_KERNEL);
87d68730 DA	134	if (!syscon)
	135	return -ENOMEM;
	136
5ab3a89a AS	137	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	138	if (!res)
	139	return -ENOENT;
87d68730	140
5ab3a89a AS	141	syscon->base = devm_ioremap(dev, res->start, resource_size(res));
	142	if (!syscon->base)
	143	return -ENOMEM;
87d68730	144
5ab3a89a	145	syscon_regmap_config.max_register = res->end - res->start - 3;
87d68730 DA	146	syscon->regmap = devm_regmap_init_mmio(dev, syscon->base,
	147	&syscon_regmap_config);
	148	if (IS_ERR(syscon->regmap)) {
	149	dev_err(dev, "regmap init failed\n");
	150	return PTR_ERR(syscon->regmap);
	151	}
	152
87d68730 DA	153	platform_set_drvdata(pdev, syscon);
87d68730 DA	154
5ab3a89a	155	dev_info(dev, "regmap 0x%x-0x%x registered\n", res->start, res->end);
87d68730 DA	156
	157	return 0;
	158	}
	159
5ab3a89a AS	160	static const struct platform_device_id syscon_ids[] = {
	161	{ "syscon", },
	162	{ }
	163	};
87d68730 DA	164
	165	static struct platform_driver syscon_driver = {
	166	.driver = {
	167	.name = "syscon",
	168	.owner = THIS_MODULE,
	169	.of_match_table = of_syscon_match,
	170	},
	171	.probe = syscon_probe,
5ab3a89a	172	.id_table = syscon_ids,
87d68730 DA	173	};
	174
	175	static int __init syscon_init(void)
	176	{
	177	return platform_driver_register(&syscon_driver);
	178	}
	179	postcore_initcall(syscon_init);
	180
	181	static void __exit syscon_exit(void)
	182	{
	183	platform_driver_unregister(&syscon_driver);
	184	}
	185	module_exit(syscon_exit);
	186
	187	MODULE_AUTHOR("Dong Aisheng <dong.aisheng@linaro.org>");
	188	MODULE_DESCRIPTION("System Control driver");
	189	MODULE_LICENSE("GPL v2");