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
 28static 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
 39static 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
 50static 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
 65static const 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
 77static const 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
 93static 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
100static 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
138static 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};
143MODULE_DEVICE_TABLE(of, qcom_refgen_match_table);
144
145static 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};
152module_platform_driver(qcom_refgen_driver);
153
154MODULE_LICENSE("GPL");
155MODULE_DESCRIPTION("Qualcomm REFGEN regulator driver");