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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 | ||
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 | ||
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 | ||
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 | ||
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 | ||
144 | static struct platform_driver qcom_refgen_driver = { | |
145 | .probe = qcom_refgen_probe, | |
146 | .driver = { | |
147 | .name = "qcom-refgen-regulator", | |
148 | .of_match_table = qcom_refgen_match_table, | |
149 | }, | |
150 | }; | |
151 | module_platform_driver(qcom_refgen_driver); | |
152 | ||
153 | MODULE_LICENSE("GPL"); | |
154 | MODULE_DESCRIPTION("Qualcomm REFGEN regulator driver"); |