1 // SPDX-License-Identifier: GPL-2.0-only
2 // Copyright (c) 2017, 2019-2020, The Linux Foundation. All rights reserved.
3 // Copyright (c) 2023, Linaro Limited
4
5 #include <linux/bitfield.h>
6 #include <linux/module.h>
7 #include <linux/of.h>
8 #include <linux/platform_device.h>
9 #include <linux/regmap.h>
10 #include <linux/regulator/driver.h>
11 #include <linux/regulator/machine.h>
12 #include <linux/regulator/of_regulator.h>
13
14 #define REFGEN_REG_BIAS_EN 0x08
15 #define REFGEN_BIAS_EN_MASK GENMASK(2, 0)
16 #define REFGEN_BIAS_EN_ENABLE 0x7
17 #define REFGEN_BIAS_EN_DISABLE 0x6
18
19 #define REFGEN_REG_BG_CTRL 0x14
20 #define REFGEN_BG_CTRL_MASK GENMASK(2, 1)
21 #define REFGEN_BG_CTRL_ENABLE 0x3
22 #define REFGEN_BG_CTRL_DISABLE 0x2
23
24 #define REFGEN_REG_PWRDWN_CTRL5 0x80
25 #define REFGEN_PWRDWN_CTRL5_MASK BIT(0)
26 #define REFGEN_PWRDWN_CTRL5_ENABLE 0x1
27
qcom_sdm845_refgen_enable(struct regulator_dev * rdev)28 static int qcom_sdm845_refgen_enable(struct regulator_dev *rdev)
29 {
30 regmap_update_bits(rdev->regmap, REFGEN_REG_BG_CTRL, REFGEN_BG_CTRL_MASK,
31 FIELD_PREP(REFGEN_BG_CTRL_MASK, REFGEN_BG_CTRL_ENABLE));
32
33 regmap_write(rdev->regmap, REFGEN_REG_BIAS_EN,
34 FIELD_PREP(REFGEN_BIAS_EN_MASK, REFGEN_BIAS_EN_ENABLE));
35
36 return 0;
37 }
38
qcom_sdm845_refgen_disable(struct regulator_dev * rdev)39 static int qcom_sdm845_refgen_disable(struct regulator_dev *rdev)
40 {
41 regmap_write(rdev->regmap, REFGEN_REG_BIAS_EN,
42 FIELD_PREP(REFGEN_BIAS_EN_MASK, REFGEN_BIAS_EN_DISABLE));
43
44 regmap_update_bits(rdev->regmap, REFGEN_REG_BG_CTRL, REFGEN_BG_CTRL_MASK,
45 FIELD_PREP(REFGEN_BG_CTRL_MASK, REFGEN_BG_CTRL_DISABLE));
46
47 return 0;
48 }
49
qcom_sdm845_refgen_is_enabled(struct regulator_dev * rdev)50 static int qcom_sdm845_refgen_is_enabled(struct regulator_dev *rdev)
51 {
52 u32 val;
53
54 regmap_read(rdev->regmap, REFGEN_REG_BG_CTRL, &val);
55 if (FIELD_GET(REFGEN_BG_CTRL_MASK, val) != REFGEN_BG_CTRL_ENABLE)
56 return 0;
57
58 regmap_read(rdev->regmap, REFGEN_REG_BIAS_EN, &val);
59 if (FIELD_GET(REFGEN_BIAS_EN_MASK, val) != REFGEN_BIAS_EN_ENABLE)
60 return 0;
61
62 return 1;
63 }
64
65 static struct regulator_desc sdm845_refgen_desc = {
66 .enable_time = 5,
67 .name = "refgen",
68 .owner = THIS_MODULE,
69 .type = REGULATOR_VOLTAGE,
70 .ops = &(const struct regulator_ops) {
71 .enable = qcom_sdm845_refgen_enable,
72 .disable = qcom_sdm845_refgen_disable,
73 .is_enabled = qcom_sdm845_refgen_is_enabled,
74 },
75 };
76
77 static struct regulator_desc sm8250_refgen_desc = {
78 .enable_reg = REFGEN_REG_PWRDWN_CTRL5,
79 .enable_mask = REFGEN_PWRDWN_CTRL5_MASK,
80 .enable_val = REFGEN_PWRDWN_CTRL5_ENABLE,
81 .disable_val = 0,
82 .enable_time = 5,
83 .name = "refgen",
84 .owner = THIS_MODULE,
85 .type = REGULATOR_VOLTAGE,
86 .ops = &(const struct regulator_ops) {
87 .enable = regulator_enable_regmap,
88 .disable = regulator_disable_regmap,
89 .is_enabled = regulator_is_enabled_regmap,
90 },
91 };
92
93 static const struct regmap_config qcom_refgen_regmap_config = {
94 .reg_bits = 32,
95 .reg_stride = 4,
96 .val_bits = 32,
97 .fast_io = true,
98 };
99
qcom_refgen_probe(struct platform_device * pdev)100 static int qcom_refgen_probe(struct platform_device *pdev)
101 {
102 struct regulator_init_data *init_data;
103 struct regulator_config config = {};
104 const struct regulator_desc *rdesc;
105 struct device *dev = &pdev->dev;
106 struct regulator_dev *rdev;
107 struct regmap *regmap;
108 void __iomem *base;
109
110 rdesc = of_device_get_match_data(dev);
111 if (!rdesc)
112 return -ENODATA;
113
114 base = devm_platform_ioremap_resource(pdev, 0);
115 if (IS_ERR(base))
116 return PTR_ERR(base);
117
118 regmap = devm_regmap_init_mmio(dev, base, &qcom_refgen_regmap_config);
119 if (IS_ERR(regmap))
120 return PTR_ERR(regmap);
121
122 init_data = of_get_regulator_init_data(dev, dev->of_node, rdesc);
123 if (!init_data)
124 return -ENOMEM;
125
126 config.dev = dev;
127 config.init_data = init_data;
128 config.of_node = dev->of_node;
129 config.regmap = regmap;
130
131 rdev = devm_regulator_register(dev, rdesc, &config);
132 if (IS_ERR(rdev))
133 return PTR_ERR(rdev);
134
135 return 0;
136 }
137
138 static const struct of_device_id qcom_refgen_match_table[] = {
139 { .compatible = "qcom,sdm845-refgen-regulator", .data = &sdm845_refgen_desc },
140 { .compatible = "qcom,sm8250-refgen-regulator", .data = &sm8250_refgen_desc },
141 { }
142 };
143 MODULE_DEVICE_TABLE(of, qcom_refgen_match_table);
144
145 static struct platform_driver qcom_refgen_driver = {
146 .probe = qcom_refgen_probe,
147 .driver = {
148 .name = "qcom-refgen-regulator",
149 .of_match_table = qcom_refgen_match_table,
150 },
151 };
152 module_platform_driver(qcom_refgen_driver);
153
154 MODULE_LICENSE("GPL");
155 MODULE_DESCRIPTION("Qualcomm REFGEN regulator driver");
156