summaryrefslogtreecommitdiffstats
path: root/drivers/regulator/qcom-refgen-regulator.c
blob: 063e12c08e75f70c002e6f3e859a8bba5e8ef344 (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
// SPDX-License-Identifier: GPL-2.0-only
// Copyright (c) 2017, 2019-2020, The Linux Foundation. All rights reserved.
// Copyright (c) 2023, Linaro Limited

#include <linux/bitfield.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/of_regulator.h>

#define REFGEN_REG_BIAS_EN		0x08
#define REFGEN_BIAS_EN_MASK		GENMASK(2, 0)
 #define REFGEN_BIAS_EN_ENABLE		0x7
 #define REFGEN_BIAS_EN_DISABLE		0x6

#define REFGEN_REG_BG_CTRL		0x14
#define REFGEN_BG_CTRL_MASK		GENMASK(2, 1)
 #define REFGEN_BG_CTRL_ENABLE		0x3
 #define REFGEN_BG_CTRL_DISABLE		0x2

#define REFGEN_REG_PWRDWN_CTRL5		0x80
#define REFGEN_PWRDWN_CTRL5_MASK	BIT(0)
 #define REFGEN_PWRDWN_CTRL5_ENABLE	0x1

static int qcom_sdm845_refgen_enable(struct regulator_dev *rdev)
{
	regmap_update_bits(rdev->regmap, REFGEN_REG_BG_CTRL, REFGEN_BG_CTRL_MASK,
			   FIELD_PREP(REFGEN_BG_CTRL_MASK, REFGEN_BG_CTRL_ENABLE));

	regmap_write(rdev->regmap, REFGEN_REG_BIAS_EN,
		     FIELD_PREP(REFGEN_BIAS_EN_MASK, REFGEN_BIAS_EN_ENABLE));

	return 0;
}

static int qcom_sdm845_refgen_disable(struct regulator_dev *rdev)
{
	regmap_write(rdev->regmap, REFGEN_REG_BIAS_EN,
		     FIELD_PREP(REFGEN_BIAS_EN_MASK, REFGEN_BIAS_EN_DISABLE));

	regmap_update_bits(rdev->regmap, REFGEN_REG_BG_CTRL, REFGEN_BG_CTRL_MASK,
			   FIELD_PREP(REFGEN_BG_CTRL_MASK, REFGEN_BG_CTRL_DISABLE));

	return 0;
}

static int qcom_sdm845_refgen_is_enabled(struct regulator_dev *rdev)
{
	u32 val;

	regmap_read(rdev->regmap, REFGEN_REG_BG_CTRL, &val);
	if (FIELD_GET(REFGEN_BG_CTRL_MASK, val) != REFGEN_BG_CTRL_ENABLE)
		return 0;

	regmap_read(rdev->regmap, REFGEN_REG_BIAS_EN, &val);
	if (FIELD_GET(REFGEN_BIAS_EN_MASK, val) != REFGEN_BIAS_EN_ENABLE)
		return 0;

	return 1;
}

static struct regulator_desc sdm845_refgen_desc = {
	.enable_time = 5,
	.name = "refgen",
	.owner = THIS_MODULE,
	.type = REGULATOR_VOLTAGE,
	.ops = &(const struct regulator_ops) {
		.enable		= qcom_sdm845_refgen_enable,
		.disable	= qcom_sdm845_refgen_disable,
		.is_enabled	= qcom_sdm845_refgen_is_enabled,
	},
};

static struct regulator_desc sm8250_refgen_desc = {
	.enable_reg = REFGEN_REG_PWRDWN_CTRL5,
	.enable_mask = REFGEN_PWRDWN_CTRL5_MASK,
	.enable_val = REFGEN_PWRDWN_CTRL5_ENABLE,
	.disable_val = 0,
	.enable_time = 5,
	.name = "refgen",
	.owner = THIS_MODULE,
	.type = REGULATOR_VOLTAGE,
	.ops = &(const struct regulator_ops) {
		.enable		= regulator_enable_regmap,
		.disable	= regulator_disable_regmap,
		.is_enabled	= regulator_is_enabled_regmap,
	},
};

static const struct regmap_config qcom_refgen_regmap_config = {
	.reg_bits = 32,
	.reg_stride = 4,
	.val_bits = 32,
	.fast_io = true,
};

static int qcom_refgen_probe(struct platform_device *pdev)
{
	struct regulator_init_data *init_data;
	struct regulator_config config = {};
	const struct regulator_desc *rdesc;
	struct device *dev = &pdev->dev;
	struct regulator_dev *rdev;
	struct regmap *regmap;
	void __iomem *base;

	rdesc = of_device_get_match_data(dev);
	if (!rdesc)
		return -ENODATA;

	base = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(base))
		return PTR_ERR(base);

	regmap = devm_regmap_init_mmio(dev, base, &qcom_refgen_regmap_config);
	if (IS_ERR(regmap))
		return PTR_ERR(regmap);

	init_data = of_get_regulator_init_data(dev, dev->of_node, rdesc);
	if (!init_data)
		return -ENOMEM;

	config.dev = dev;
	config.init_data = init_data;
	config.of_node = dev->of_node;
	config.regmap = regmap;

	rdev = devm_regulator_register(dev, rdesc, &config);
	if (IS_ERR(rdev))
		return PTR_ERR(rdev);

	return 0;
}

static const struct of_device_id qcom_refgen_match_table[] = {
	{ .compatible = "qcom,sdm845-refgen-regulator", .data = &sdm845_refgen_desc },
	{ .compatible = "qcom,sm8250-refgen-regulator", .data = &sm8250_refgen_desc },
	{ }
};
MODULE_DEVICE_TABLE(of, qcom_refgen_match_table);

static struct platform_driver qcom_refgen_driver = {
	.probe = qcom_refgen_probe,
	.driver = {
		.name = "qcom-refgen-regulator",
		.of_match_table = qcom_refgen_match_table,
	},
};
module_platform_driver(qcom_refgen_driver);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Qualcomm REFGEN regulator driver");