drivers/regulator/lochnagar-regulator.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 //
   3 // Lochnagar regulator driver
   4 //
   5 // Copyright (c) 2017-2018 Cirrus Logic, Inc. and
   6 //                         Cirrus Logic International Semiconductor Ltd.
   7 //
   8 // Author: Charles Keepax <ckeepax@opensource.cirrus.com>
   9
  10 #include <linux/bitops.h>
  11 #include <linux/device.h>
  12 #include <linux/err.h>
  13 #include <linux/module.h>
  14 #include <linux/mutex.h>
  15 #include <linux/of.h>
  16 #include <linux/of_device.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/regmap.h>
  19 #include <linux/regulator/driver.h>
  20 #include <linux/regulator/machine.h>
  21 #include <linux/regulator/of_regulator.h>
  22
  23 #include <linux/mfd/lochnagar.h>
  24 #include <linux/mfd/lochnagar1_regs.h>
  25 #include <linux/mfd/lochnagar2_regs.h>
  26
  27 static const struct regulator_ops lochnagar_micvdd_ops = {
  28         .enable = regulator_enable_regmap,
  29         .disable = regulator_disable_regmap,
  30         .is_enabled = regulator_is_enabled_regmap,
  31
  32         .list_voltage = regulator_list_voltage_linear_range,
  33         .map_voltage = regulator_map_voltage_linear_range,
  34
  35         .get_voltage_sel = regulator_get_voltage_sel_regmap,
  36         .set_voltage_sel = regulator_set_voltage_sel_regmap,
  37 };
  38
  39 static const struct linear_range lochnagar_micvdd_ranges[] = {
  40         REGULATOR_LINEAR_RANGE(1000000, 0,    0xC, 50000),
  41         REGULATOR_LINEAR_RANGE(1700000, 0xD, 0x1F, 100000),
  42 };
  43
  44 static int lochnagar_micbias_enable(struct regulator_dev *rdev)
  45 {
  46         struct lochnagar *lochnagar = rdev_get_drvdata(rdev);
  47         int ret;
  48
  49         mutex_lock(&lochnagar->analogue_config_lock);
  50
  51         ret = regulator_enable_regmap(rdev);
  52         if (ret < 0)
  53                 goto err;
  54
  55         ret = lochnagar_update_config(lochnagar);
  56
  57 err:
  58         mutex_unlock(&lochnagar->analogue_config_lock);
  59
  60         return ret;
  61 }
  62
  63 static int lochnagar_micbias_disable(struct regulator_dev *rdev)
  64 {
  65         struct lochnagar *lochnagar = rdev_get_drvdata(rdev);
  66         int ret;
  67
  68         mutex_lock(&lochnagar->analogue_config_lock);
  69
  70         ret = regulator_disable_regmap(rdev);
  71         if (ret < 0)
  72                 goto err;
  73
  74         ret = lochnagar_update_config(lochnagar);
  75
  76 err:
  77         mutex_unlock(&lochnagar->analogue_config_lock);
  78
  79         return ret;
  80 }
  81
  82 static const struct regulator_ops lochnagar_micbias_ops = {
  83         .enable = lochnagar_micbias_enable,
  84         .disable = lochnagar_micbias_disable,
  85         .is_enabled = regulator_is_enabled_regmap,
  86 };
  87
  88 static const struct regulator_ops lochnagar_vddcore_ops = {
  89         .enable = regulator_enable_regmap,
  90         .disable = regulator_disable_regmap,
  91         .is_enabled = regulator_is_enabled_regmap,
  92
  93         .list_voltage = regulator_list_voltage_linear_range,
  94         .map_voltage = regulator_map_voltage_linear_range,
  95
  96         .get_voltage_sel = regulator_get_voltage_sel_regmap,
  97         .set_voltage_sel = regulator_set_voltage_sel_regmap,
  98 };
  99
 100 static const struct linear_range lochnagar_vddcore_ranges[] = {
 101         REGULATOR_LINEAR_RANGE(600000, 0,    0x7, 0),
 102         REGULATOR_LINEAR_RANGE(600000, 0x8, 0x41, 12500),
 103 };
 104
 105 enum lochnagar_regulators {
 106         LOCHNAGAR_MICVDD,
 107         LOCHNAGAR_MIC1VDD,
 108         LOCHNAGAR_MIC2VDD,
 109         LOCHNAGAR_VDDCORE,
 110 };
 111
 112 static int lochnagar_micbias_of_parse(struct device_node *np,
 113                                       const struct regulator_desc *desc,
 114                                       struct regulator_config *config)
 115 {
 116         struct lochnagar *lochnagar = config->driver_data;
 117         int shift = (desc->id - LOCHNAGAR_MIC1VDD) *
 118                     LOCHNAGAR2_P2_MICBIAS_SRC_SHIFT;
 119         int mask = LOCHNAGAR2_P1_MICBIAS_SRC_MASK << shift;
 120         unsigned int val;
 121         int ret;
 122
 123         ret = of_property_read_u32(np, "cirrus,micbias-input", &val);
 124         if (ret >= 0) {
 125                 mutex_lock(&lochnagar->analogue_config_lock);
 126                 ret = regmap_update_bits(lochnagar->regmap,
 127                                          LOCHNAGAR2_ANALOGUE_PATH_CTRL2,
 128                                          mask, val << shift);
 129                 mutex_unlock(&lochnagar->analogue_config_lock);
 130                 if (ret < 0) {
 131                         dev_err(lochnagar->dev,
 132                                 "Failed to update micbias source: %d\n", ret);
 133                         return ret;
 134                 }
 135         }
 136
 137         return 0;
 138 }
 139
 140 static const struct regulator_desc lochnagar_regulators[] = {
 141         [LOCHNAGAR_MICVDD] = {
 142                 .name = "MICVDD",
 143                 .supply_name = "SYSVDD",
 144                 .type = REGULATOR_VOLTAGE,
 145                 .n_voltages = 32,
 146                 .ops = &lochnagar_micvdd_ops,
 147
 148                 .id = LOCHNAGAR_MICVDD,
 149                 .of_match = of_match_ptr("MICVDD"),
 150
 151                 .enable_reg = LOCHNAGAR2_MICVDD_CTRL1,
 152                 .enable_mask = LOCHNAGAR2_MICVDD_REG_ENA_MASK,
 153                 .vsel_reg = LOCHNAGAR2_MICVDD_CTRL2,
 154                 .vsel_mask = LOCHNAGAR2_MICVDD_VSEL_MASK,
 155
 156                 .linear_ranges = lochnagar_micvdd_ranges,
 157                 .n_linear_ranges = ARRAY_SIZE(lochnagar_micvdd_ranges),
 158
 159                 .enable_time = 3000,
 160                 .ramp_delay = 1000,
 161
 162                 .owner = THIS_MODULE,
 163         },
 164         [LOCHNAGAR_MIC1VDD] = {
 165                 .name = "MIC1VDD",
 166                 .supply_name = "MICBIAS1",
 167                 .type = REGULATOR_VOLTAGE,
 168                 .ops = &lochnagar_micbias_ops,
 169
 170                 .id = LOCHNAGAR_MIC1VDD,
 171                 .of_match = of_match_ptr("MIC1VDD"),
 172                 .of_parse_cb = lochnagar_micbias_of_parse,
 173
 174                 .enable_reg = LOCHNAGAR2_ANALOGUE_PATH_CTRL2,
 175                 .enable_mask = LOCHNAGAR2_P1_INPUT_BIAS_ENA_MASK,
 176
 177                 .owner = THIS_MODULE,
 178         },
 179         [LOCHNAGAR_MIC2VDD] = {
 180                 .name = "MIC2VDD",
 181                 .supply_name = "MICBIAS2",
 182                 .type = REGULATOR_VOLTAGE,
 183                 .ops = &lochnagar_micbias_ops,
 184
 185                 .id = LOCHNAGAR_MIC2VDD,
 186                 .of_match = of_match_ptr("MIC2VDD"),
 187                 .of_parse_cb = lochnagar_micbias_of_parse,
 188
 189                 .enable_reg = LOCHNAGAR2_ANALOGUE_PATH_CTRL2,
 190                 .enable_mask = LOCHNAGAR2_P2_INPUT_BIAS_ENA_MASK,
 191
 192                 .owner = THIS_MODULE,
 193         },
 194         [LOCHNAGAR_VDDCORE] = {
 195                 .name = "VDDCORE",
 196                 .supply_name = "SYSVDD",
 197                 .type = REGULATOR_VOLTAGE,
 198                 .n_voltages = 66,
 199                 .ops = &lochnagar_vddcore_ops,
 200
 201                 .id = LOCHNAGAR_VDDCORE,
 202                 .of_match = of_match_ptr("VDDCORE"),
 203
 204                 .enable_reg = LOCHNAGAR2_VDDCORE_CDC_CTRL1,
 205                 .enable_mask = LOCHNAGAR2_VDDCORE_CDC_REG_ENA_MASK,
 206                 .vsel_reg = LOCHNAGAR2_VDDCORE_CDC_CTRL2,
 207                 .vsel_mask = LOCHNAGAR2_VDDCORE_CDC_VSEL_MASK,
 208
 209                 .linear_ranges = lochnagar_vddcore_ranges,
 210                 .n_linear_ranges = ARRAY_SIZE(lochnagar_vddcore_ranges),
 211
 212                 .enable_time = 3000,
 213                 .ramp_delay = 1000,
 214                 .off_on_delay = 15000,
 215
 216                 .owner = THIS_MODULE,
 217         },
 218 };
 219
 220 static const struct of_device_id lochnagar_of_match[] = {
 221         {
 222                 .compatible = "cirrus,lochnagar2-micvdd",
 223                 .data = &lochnagar_regulators[LOCHNAGAR_MICVDD],
 224         },
 225         {
 226                 .compatible = "cirrus,lochnagar2-mic1vdd",
 227                 .data = &lochnagar_regulators[LOCHNAGAR_MIC1VDD],
 228         },
 229         {
 230                 .compatible = "cirrus,lochnagar2-mic2vdd",
 231                 .data = &lochnagar_regulators[LOCHNAGAR_MIC2VDD],
 232         },
 233         {
 234                 .compatible = "cirrus,lochnagar2-vddcore",
 235                 .data = &lochnagar_regulators[LOCHNAGAR_VDDCORE],
 236         },
 237         {}
 238 };
 239 MODULE_DEVICE_TABLE(of, lochnagar_of_match);
 240
 241 static int lochnagar_regulator_probe(struct platform_device *pdev)
 242 {
 243         struct device *dev = &pdev->dev;
 244         struct lochnagar *lochnagar = dev_get_drvdata(dev->parent);
 245         struct regulator_config config = { };
 246         const struct of_device_id *of_id;
 247         const struct regulator_desc *desc;
 248         struct regulator_dev *rdev;
 249         int ret;
 250
 251         config.dev = dev;
 252         config.regmap = lochnagar->regmap;
 253         config.driver_data = lochnagar;
 254
 255         of_id = of_match_device(lochnagar_of_match, dev);
 256         if (!of_id)
 257                 return -EINVAL;
 258
 259         desc = of_id->data;
 260
 261         rdev = devm_regulator_register(dev, desc, &config);
 262         if (IS_ERR(rdev)) {
 263                 ret = PTR_ERR(rdev);
 264                 dev_err(dev, "Failed to register %s regulator: %d\n",
 265                         desc->name, ret);
 266                 return ret;
 267         }
 268
 269         return 0;
 270 }
 271
 272 static struct platform_driver lochnagar_regulator_driver = {
 273         .driver = {
 274                 .name = "lochnagar-regulator",
 275                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
 276                 .of_match_table = of_match_ptr(lochnagar_of_match),
 277         },
 278
 279         .probe = lochnagar_regulator_probe,
 280 };
 281 module_platform_driver(lochnagar_regulator_driver);
 282
 283 MODULE_AUTHOR("Charles Keepax <ckeepax@opensource.cirrus.com>");
 284 MODULE_DESCRIPTION("Regulator driver for Cirrus Logic Lochnagar Board");
 285 MODULE_LICENSE("GPL v2");
 286 MODULE_ALIAS("platform:lochnagar-regulator");