[mirror_ubuntu-zesty-kernel.git] / drivers / regulator / pbias-regulator.c

/*
 * pbias-regulator.c
 *
 * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com/
 * Author: Balaji T K <balajitk@ti.com>
 *
 * 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 version 2.
 *
 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
 * kind, whether express or implied; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/err.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/mfd/syscon.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/of_regulator.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/of_device.h>

struct pbias_reg_info {
	u32 enable;
	u32 enable_mask;
	u32 vmode;
	unsigned int enable_time;
	char *name;
};

struct pbias_regulator_data {
	struct regulator_desc desc;
	void __iomem *pbias_addr;
	unsigned int pbias_reg;
	struct regulator_dev *dev;
	struct regmap *syscon;
	const struct pbias_reg_info *info;
	int voltage;
};

static int pbias_regulator_set_voltage(struct regulator_dev *dev,
			int min_uV, int max_uV, unsigned *selector)
{
	struct pbias_regulator_data *data = rdev_get_drvdata(dev);
	const struct pbias_reg_info *info = data->info;
	int ret, vmode;

	if (min_uV <= 1800000)
		vmode = 0;
	else if (min_uV > 1800000)
		vmode = info->vmode;

	ret = regmap_update_bits(data->syscon, data->pbias_reg,
						info->vmode, vmode);

	return ret;
}

static int pbias_regulator_get_voltage(struct regulator_dev *rdev)
{
	struct pbias_regulator_data *data = rdev_get_drvdata(rdev);
	const struct pbias_reg_info *info = data->info;
	int value, voltage;

	regmap_read(data->syscon, data->pbias_reg, &value);
	value &= info->vmode;

	voltage = value ? 3000000 : 1800000;

	return voltage;
}

static int pbias_regulator_enable(struct regulator_dev *rdev)
{
	struct pbias_regulator_data *data = rdev_get_drvdata(rdev);
	const struct pbias_reg_info *info = data->info;
	int ret;

	ret = regmap_update_bits(data->syscon, data->pbias_reg,
					info->enable_mask, info->enable);

	return ret;
}

static int pbias_regulator_disable(struct regulator_dev *rdev)
{
	struct pbias_regulator_data *data = rdev_get_drvdata(rdev);
	const struct pbias_reg_info *info = data->info;
	int ret;

	ret = regmap_update_bits(data->syscon, data->pbias_reg,
						info->enable_mask, 0);
	return ret;
}

static int pbias_regulator_is_enable(struct regulator_dev *rdev)
{
	struct pbias_regulator_data *data = rdev_get_drvdata(rdev);
	const struct pbias_reg_info *info = data->info;
	int value;

	regmap_read(data->syscon, data->pbias_reg, &value);

	return (value & info->enable_mask) == info->enable_mask;
}

static struct regulator_ops pbias_regulator_voltage_ops = {
	.set_voltage	= pbias_regulator_set_voltage,
	.get_voltage	= pbias_regulator_get_voltage,
	.enable		= pbias_regulator_enable,
	.disable	= pbias_regulator_disable,
	.is_enabled	= pbias_regulator_is_enable,
};

static const struct pbias_reg_info pbias_mmc_omap2430 = {
	.enable = BIT(1),
	.enable_mask = BIT(1),
	.vmode = BIT(0),
	.enable_time = 100,
	.name = "pbias_mmc_omap2430"
};

static const struct pbias_reg_info pbias_sim_omap3 = {
	.enable = BIT(9),
	.enable_mask = BIT(9),
	.vmode = BIT(8),
	.enable_time = 100,
	.name = "pbias_sim_omap3"
};

static const struct pbias_reg_info pbias_mmc_omap4 = {
	.enable = BIT(26) | BIT(22),
	.enable_mask = BIT(26) | BIT(25) | BIT(22),
	.vmode = BIT(21),
	.enable_time = 100,
	.name = "pbias_mmc_omap4"
};

static const struct pbias_reg_info pbias_mmc_omap5 = {
	.enable = BIT(27) | BIT(26),
	.enable_mask = BIT(27) | BIT(25) | BIT(26),
	.vmode = BIT(21),
	.enable_time = 100,
	.name = "pbias_mmc_omap5"
};

static struct of_regulator_match pbias_matches[] = {
	{ .name = "pbias_mmc_omap2430", .driver_data = (void *)&pbias_mmc_omap2430},
	{ .name = "pbias_sim_omap3", .driver_data = (void *)&pbias_sim_omap3},
	{ .name = "pbias_mmc_omap4", .driver_data = (void *)&pbias_mmc_omap4},
	{ .name = "pbias_mmc_omap5", .driver_data = (void *)&pbias_mmc_omap5},
};
#define PBIAS_NUM_REGS	ARRAY_SIZE(pbias_matches)

static const struct of_device_id pbias_of_match[] = {
	{ .compatible = "ti,pbias-omap", },
	{},
};
MODULE_DEVICE_TABLE(of, pbias_of_match);

static int pbias_regulator_probe(struct platform_device *pdev)
{
	struct device_node *np = pdev->dev.of_node;
	struct pbias_regulator_data *drvdata;
	struct resource *res;
	struct regulator_config cfg = { };
	struct regmap *syscon;
	const struct pbias_reg_info *info;
	int ret = 0;
	int count, idx, data_idx = 0;

	count = of_regulator_match(&pdev->dev, np, pbias_matches,
						PBIAS_NUM_REGS);
	if (count < 0)
		return count;

	drvdata = devm_kzalloc(&pdev->dev, sizeof(struct pbias_regulator_data)
			       * count, GFP_KERNEL);
	if (drvdata == NULL) {
		dev_err(&pdev->dev, "Failed to allocate device data\n");
		return -ENOMEM;
	}

	syscon = syscon_regmap_lookup_by_phandle(np, "syscon");
	if (IS_ERR(syscon))
		return PTR_ERR(syscon);

	cfg.dev = &pdev->dev;

	for (idx = 0; idx < PBIAS_NUM_REGS && data_idx < count; idx++) {
		if (!pbias_matches[idx].init_data ||
			!pbias_matches[idx].of_node)
			continue;

		info = pbias_matches[idx].driver_data;
		if (!info)
			return -ENODEV;

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

		drvdata[data_idx].pbias_reg = res->start;
		drvdata[data_idx].syscon = syscon;
		drvdata[data_idx].info = info;
		drvdata[data_idx].desc.name = info->name;
		drvdata[data_idx].desc.owner = THIS_MODULE;
		drvdata[data_idx].desc.type = REGULATOR_VOLTAGE;
		drvdata[data_idx].desc.ops = &pbias_regulator_voltage_ops;
		drvdata[data_idx].desc.n_voltages = 2;
		drvdata[data_idx].desc.enable_time = info->enable_time;

		cfg.init_data = pbias_matches[idx].init_data;
		cfg.driver_data = &drvdata[data_idx];
		cfg.of_node = pbias_matches[idx].of_node;

		drvdata[data_idx].dev = devm_regulator_register(&pdev->dev,
					&drvdata[data_idx].desc, &cfg);
		if (IS_ERR(drvdata[data_idx].dev)) {
			ret = PTR_ERR(drvdata[data_idx].dev);
			dev_err(&pdev->dev,
				"Failed to register regulator: %d\n", ret);
			goto err_regulator;
		}
		data_idx++;
	}

	platform_set_drvdata(pdev, drvdata);

err_regulator:
	return ret;
}

static struct platform_driver pbias_regulator_driver = {
	.probe		= pbias_regulator_probe,
	.driver		= {
		.name		= "pbias-regulator",
		.owner		= THIS_MODULE,
		.of_match_table = of_match_ptr(pbias_of_match),
	},
};

module_platform_driver(pbias_regulator_driver);

MODULE_AUTHOR("Balaji T K <balajitk@ti.com>");
MODULE_DESCRIPTION("pbias voltage regulator");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:pbias-regulator");
Commit	Line	Data
11469e0b B	1	/*
	2	* pbias-regulator.c
	3	*
	4	* Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com/
	5	* Author: Balaji T K <balajitk@ti.com>
	6	*
	7	* This program is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU General Public License as
	9	* published by the Free Software Foundation version 2.
	10	*
	11	* This program is distributed "as is" WITHOUT ANY WARRANTY of any
	12	* kind, whether express or implied; without even the implied warranty
	13	* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*/
	16
	17	#include <linux/err.h>
	18	#include <linux/io.h>
	19	#include <linux/module.h>
	20	#include <linux/mfd/syscon.h>
	21	#include <linux/platform_device.h>
	22	#include <linux/regulator/driver.h>
	23	#include <linux/regulator/machine.h>
	24	#include <linux/regulator/of_regulator.h>
	25	#include <linux/regmap.h>
	26	#include <linux/slab.h>
	27	#include <linux/of.h>
	28	#include <linux/of_device.h>
	29
	30	struct pbias_reg_info {
	31	u32 enable;
	32	u32 enable_mask;
	33	u32 vmode;
	34	unsigned int enable_time;
	35	char *name;
	36	};
	37
	38	struct pbias_regulator_data {
	39	struct regulator_desc desc;
	40	void __iomem *pbias_addr;
	41	unsigned int pbias_reg;
	42	struct regulator_dev *dev;
	43	struct regmap *syscon;
	44	const struct pbias_reg_info *info;
	45	int voltage;
	46	};
	47
	48	static int pbias_regulator_set_voltage(struct regulator_dev *dev,
	49	int min_uV, int max_uV, unsigned *selector)
	50	{
	51	struct pbias_regulator_data *data = rdev_get_drvdata(dev);
	52	const struct pbias_reg_info *info = data->info;
	53	int ret, vmode;
	54
	55	if (min_uV <= 1800000)
	56	vmode = 0;
	57	else if (min_uV > 1800000)
	58	vmode = info->vmode;
	59
	60	ret = regmap_update_bits(data->syscon, data->pbias_reg,
	61	info->vmode, vmode);
	62
	63	return ret;
	64	}
65
66	static int pbias_regulator_get_voltage(struct regulator_dev *rdev)
67	{
68	struct pbias_regulator_data *data = rdev_get_drvdata(rdev);
69	const struct pbias_reg_info *info = data->info;
70	int value, voltage;
71
72	regmap_read(data->syscon, data->pbias_reg, &value);
73	value &= info->vmode;
74
75	voltage = value ? 3000000 : 1800000;
76
77	return voltage;
78	}
79
80	static int pbias_regulator_enable(struct regulator_dev *rdev)
81	{
82	struct pbias_regulator_data *data = rdev_get_drvdata(rdev);
83	const struct pbias_reg_info *info = data->info;
84	int ret;
85
86	ret = regmap_update_bits(data->syscon, data->pbias_reg,
87	info->enable_mask, info->enable);
88
89	return ret;
90	}
91
92	static int pbias_regulator_disable(struct regulator_dev *rdev)
93	{
94	struct pbias_regulator_data *data = rdev_get_drvdata(rdev);
95	const struct pbias_reg_info *info = data->info;
96	int ret;
97
98	ret = regmap_update_bits(data->syscon, data->pbias_reg,
99	info->enable_mask, 0);
100	return ret;
101	}
102
103	static int pbias_regulator_is_enable(struct regulator_dev *rdev)
104	{
105	struct pbias_regulator_data *data = rdev_get_drvdata(rdev);
106	const struct pbias_reg_info *info = data->info;
107	int value;
108
109	regmap_read(data->syscon, data->pbias_reg, &value);
110
111	return (value & info->enable_mask) == info->enable_mask;
112	}
113
114	static struct regulator_ops pbias_regulator_voltage_ops = {
115	.set_voltage = pbias_regulator_set_voltage,
116	.get_voltage = pbias_regulator_get_voltage,
117	.enable = pbias_regulator_enable,
118	.disable = pbias_regulator_disable,
119	.is_enabled = pbias_regulator_is_enable,
120	};
121
122	static const struct pbias_reg_info pbias_mmc_omap2430 = {
123	.enable = BIT(1),
124	.enable_mask = BIT(1),
125	.vmode = BIT(0),
126	.enable_time = 100,
127	.name = "pbias_mmc_omap2430"
128	};
129
130	static const struct pbias_reg_info pbias_sim_omap3 = {
131	.enable = BIT(9),
132	.enable_mask = BIT(9),
133	.vmode = BIT(8),
134	.enable_time = 100,
135	.name = "pbias_sim_omap3"
136	};
137
138	static const struct pbias_reg_info pbias_mmc_omap4 = {
139	.enable = BIT(26) \| BIT(22),
140	.enable_mask = BIT(26) \| BIT(25) \| BIT(22),
141	.vmode = BIT(21),
142	.enable_time = 100,
143	.name = "pbias_mmc_omap4"
144	};
145
146	static const struct pbias_reg_info pbias_mmc_omap5 = {
147	.enable = BIT(27) \| BIT(26),
148	.enable_mask = BIT(27) \| BIT(25) \| BIT(26),
149	.vmode = BIT(21),
150	.enable_time = 100,
151	.name = "pbias_mmc_omap5"
152	};
153
154	static struct of_regulator_match pbias_matches[] = {
155	{ .name = "pbias_mmc_omap2430", .driver_data = (void *)&pbias_mmc_omap2430},
156	{ .name = "pbias_sim_omap3", .driver_data = (void *)&pbias_sim_omap3},
157	{ .name = "pbias_mmc_omap4", .driver_data = (void *)&pbias_mmc_omap4},
158	{ .name = "pbias_mmc_omap5", .driver_data = (void *)&pbias_mmc_omap5},
159	};
160	#define PBIAS_NUM_REGS ARRAY_SIZE(pbias_matches)
161
162	static const struct of_device_id pbias_of_match[] = {
163	{ .compatible = "ti,pbias-omap", },
164	{},
165	};
166	MODULE_DEVICE_TABLE(of, pbias_of_match);
167
168	static int pbias_regulator_probe(struct platform_device *pdev)
169	{
170	struct device_node *np = pdev->dev.of_node;
171	struct pbias_regulator_data *drvdata;
172	struct resource *res;
173	struct regulator_config cfg = { };
174	struct regmap *syscon;
175	const struct pbias_reg_info *info;
176	int ret = 0;
177	int count, idx, data_idx = 0;
178
179	count = of_regulator_match(&pdev->dev, np, pbias_matches,
180	PBIAS_NUM_REGS);
181	if (count < 0)
182	return count;
183
184	drvdata = devm_kzalloc(&pdev->dev, sizeof(struct pbias_regulator_data)
185	* count, GFP_KERNEL);
186	if (drvdata == NULL) {
187	dev_err(&pdev->dev, "Failed to allocate device data\n");
188	return -ENOMEM;
189	}
190
191	syscon = syscon_regmap_lookup_by_phandle(np, "syscon");
192	if (IS_ERR(syscon))
193	return PTR_ERR(syscon);
194
195	cfg.dev = &pdev->dev;
196
197	for (idx = 0; idx < PBIAS_NUM_REGS && data_idx < count; idx++) {
198	if (!pbias_matches[idx].init_data \|\|
199	!pbias_matches[idx].of_node)
200	continue;
201
202	info = pbias_matches[idx].driver_data;
203	if (!info)
204	return -ENODEV;
205
206	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
207	if (!res)
208	return -EINVAL;
209
210	drvdata[data_idx].pbias_reg = res->start;
211	drvdata[data_idx].syscon = syscon;
212	drvdata[data_idx].info = info;
213	drvdata[data_idx].desc.name = info->name;
214	drvdata[data_idx].desc.owner = THIS_MODULE;
215	drvdata[data_idx].desc.type = REGULATOR_VOLTAGE;
216	drvdata[data_idx].desc.ops = &pbias_regulator_voltage_ops;
217	drvdata[data_idx].desc.n_voltages = 2;
218	drvdata[data_idx].desc.enable_time = info->enable_time;
219
220	cfg.init_data = pbias_matches[idx].init_data;
221	cfg.driver_data = &drvdata[data_idx];
222	cfg.of_node = pbias_matches[idx].of_node;
223
224	drvdata[data_idx].dev = devm_regulator_register(&pdev->dev,
225	&drvdata[data_idx].desc, &cfg);
226	if (IS_ERR(drvdata[data_idx].dev)) {
227	ret = PTR_ERR(drvdata[data_idx].dev);
228	dev_err(&pdev->dev,
229	"Failed to register regulator: %d\n", ret);
230	goto err_regulator;
231	}
232	data_idx++;
233	}
234
235	platform_set_drvdata(pdev, drvdata);
236
237	err_regulator:
238	return ret;
239	}
240
241	static struct platform_driver pbias_regulator_driver = {
242	.probe = pbias_regulator_probe,
243	.driver = {
244	.name = "pbias-regulator",
245	.owner = THIS_MODULE,
246	.of_match_table = of_match_ptr(pbias_of_match),
247	},
248	};
249
250	module_platform_driver(pbias_regulator_driver);
251
252	MODULE_AUTHOR("Balaji T K <balajitk@ti.com>");
253	MODULE_DESCRIPTION("pbias voltage regulator");
254	MODULE_LICENSE("GPL");
255	MODULE_ALIAS("platform:pbias-regulator");