156 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2// Copyright (c) 2017, 2019-2020, The Linux Foundation. All rights reserved.3// Copyright (c) 2023, Linaro Limited4 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 0x0815#define REFGEN_BIAS_EN_MASK GENMASK(2, 0)16 #define REFGEN_BIAS_EN_ENABLE 0x717 #define REFGEN_BIAS_EN_DISABLE 0x618 19#define REFGEN_REG_BG_CTRL 0x1420#define REFGEN_BG_CTRL_MASK GENMASK(2, 1)21 #define REFGEN_BG_CTRL_ENABLE 0x322 #define REFGEN_BG_CTRL_DISABLE 0x223 24#define REFGEN_REG_PWRDWN_CTRL5 0x8025#define REFGEN_PWRDWN_CTRL5_MASK BIT(0)26 #define REFGEN_PWRDWN_CTRL5_ENABLE 0x127 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");156