summaryrefslogtreecommitdiff
path: root/drivers/regulator/pbias-regulator.c
blob: bd2b75c0d1d1201663cc29fd2b26100de3671459 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
/*
 * 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;
	struct regulator_dev *dev;
	struct regmap *syscon;
	const struct pbias_reg_info *info;
	int voltage;
};

static const unsigned int pbias_volt_table[] = {
	1800000,
	3000000
};

static struct regulator_ops pbias_regulator_voltage_ops = {
	.list_voltage = regulator_list_voltage_table,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.is_enabled = regulator_is_enabled_regmap,
};

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)
		return -ENOMEM;

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

	cfg.regmap = 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].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.volt_table = pbias_volt_table;
		drvdata[data_idx].desc.n_voltages = 2;
		drvdata[data_idx].desc.enable_time = info->enable_time;
		drvdata[data_idx].desc.vsel_reg = res->start;
		drvdata[data_idx].desc.vsel_mask = info->vmode;
		drvdata[data_idx].desc.enable_reg = res->start;
		drvdata[data_idx].desc.enable_mask = info->enable_mask;
		drvdata[data_idx].desc.enable_val = info->enable;

		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",
		.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");