drivers/regulator/qcom-refgen-regulator.c

   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 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
  77 static 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
  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 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");