kernel/drivers/regulator/arizona-ldo1.c

   1 /*
   2  * arizona-ldo1.c  --  LDO1 supply for Arizona devices
   3  *
   4  * Copyright 2012 Wolfson Microelectronics PLC.
   5  *
   6  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
   7  *
   8  *  This program is free software; you can redistribute  it and/or modify it
   9  *  under  the terms of  the GNU General  Public License as published by the
  10  *  Free Software Foundation;  either version 2 of the  License, or (at your
  11  *  option) any later version.
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/moduleparam.h>
  16 #include <linux/init.h>
  17 #include <linux/bitops.h>
  18 #include <linux/err.h>
  19 #include <linux/of.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/regulator/driver.h>
  22 #include <linux/regulator/machine.h>
  23 #include <linux/regulator/of_regulator.h>
  24 #include <linux/gpio.h>
  25 #include <linux/slab.h>
  26
  27 #include <linux/mfd/arizona/core.h>
  28 #include <linux/mfd/arizona/pdata.h>
  29 #include <linux/mfd/arizona/registers.h>
  30
  31 struct arizona_ldo1 {
  32         struct regulator_dev *regulator;
  33         struct arizona *arizona;
  34
  35         struct regulator_consumer_supply supply;
  36         struct regulator_init_data init_data;
  37 };
  38
  39 static int arizona_ldo1_hc_list_voltage(struct regulator_dev *rdev,
  40                                         unsigned int selector)
  41 {
  42         if (selector >= rdev->desc->n_voltages)
  43                 return -EINVAL;
  44
  45         if (selector == rdev->desc->n_voltages - 1)
  46                 return 1800000;
  47         else
  48                 return rdev->desc->min_uV + (rdev->desc->uV_step * selector);
  49 }
  50
  51 static int arizona_ldo1_hc_map_voltage(struct regulator_dev *rdev,
  52                                        int min_uV, int max_uV)
  53 {
  54         int sel;
  55
  56         sel = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step);
  57         if (sel >= rdev->desc->n_voltages)
  58                 sel = rdev->desc->n_voltages - 1;
  59
  60         return sel;
  61 }
  62
  63 static int arizona_ldo1_hc_set_voltage_sel(struct regulator_dev *rdev,
  64                                            unsigned sel)
  65 {
  66         struct arizona_ldo1 *ldo = rdev_get_drvdata(rdev);
  67         struct regmap *regmap = ldo->arizona->regmap;
  68         unsigned int val;
  69         int ret;
  70
  71         if (sel == rdev->desc->n_voltages - 1)
  72                 val = ARIZONA_LDO1_HI_PWR;
  73         else
  74                 val = 0;
  75
  76         ret = regmap_update_bits(regmap, ARIZONA_LDO1_CONTROL_2,
  77                                  ARIZONA_LDO1_HI_PWR, val);
  78         if (ret != 0)
  79                 return ret;
  80
  81         ret = regmap_update_bits(regmap, ARIZONA_DYNAMIC_FREQUENCY_SCALING_1,
  82                                  ARIZONA_SUBSYS_MAX_FREQ, val);
  83         if (ret != 0)
  84                 return ret;
  85
  86         if (val)
  87                 return 0;
  88
  89         val = sel << ARIZONA_LDO1_VSEL_SHIFT;
  90
  91         return regmap_update_bits(regmap, ARIZONA_LDO1_CONTROL_1,
  92                                   ARIZONA_LDO1_VSEL_MASK, val);
  93 }
  94
  95 static int arizona_ldo1_hc_get_voltage_sel(struct regulator_dev *rdev)
  96 {
  97         struct arizona_ldo1 *ldo = rdev_get_drvdata(rdev);
  98         struct regmap *regmap = ldo->arizona->regmap;
  99         unsigned int val;
 100         int ret;
 101
 102         ret = regmap_read(regmap, ARIZONA_LDO1_CONTROL_2, &val);
 103         if (ret != 0)
 104                 return ret;
 105
 106         if (val & ARIZONA_LDO1_HI_PWR)
 107                 return rdev->desc->n_voltages - 1;
 108
 109         ret = regmap_read(regmap, ARIZONA_LDO1_CONTROL_1, &val);
 110         if (ret != 0)
 111                 return ret;
 112
 113         return (val & ARIZONA_LDO1_VSEL_MASK) >> ARIZONA_LDO1_VSEL_SHIFT;
 114 }
 115
 116 static struct regulator_ops arizona_ldo1_hc_ops = {
 117         .list_voltage = arizona_ldo1_hc_list_voltage,
 118         .map_voltage = arizona_ldo1_hc_map_voltage,
 119         .get_voltage_sel = arizona_ldo1_hc_get_voltage_sel,
 120         .set_voltage_sel = arizona_ldo1_hc_set_voltage_sel,
 121         .get_bypass = regulator_get_bypass_regmap,
 122         .set_bypass = regulator_set_bypass_regmap,
 123 };
 124
 125 static const struct regulator_desc arizona_ldo1_hc = {
 126         .name = "LDO1",
 127         .supply_name = "LDOVDD",
 128         .type = REGULATOR_VOLTAGE,
 129         .ops = &arizona_ldo1_hc_ops,
 130
 131         .bypass_reg = ARIZONA_LDO1_CONTROL_1,
 132         .bypass_mask = ARIZONA_LDO1_BYPASS,
 133         .min_uV = 900000,
 134         .uV_step = 50000,
 135         .n_voltages = 8,
 136         .enable_time = 1500,
 137
 138         .owner = THIS_MODULE,
 139 };
 140
 141 static struct regulator_ops arizona_ldo1_ops = {
 142         .list_voltage = regulator_list_voltage_linear,
 143         .map_voltage = regulator_map_voltage_linear,
 144         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 145         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 146 };
 147
 148 static const struct regulator_desc arizona_ldo1 = {
 149         .name = "LDO1",
 150         .supply_name = "LDOVDD",
 151         .type = REGULATOR_VOLTAGE,
 152         .ops = &arizona_ldo1_ops,
 153
 154         .vsel_reg = ARIZONA_LDO1_CONTROL_1,
 155         .vsel_mask = ARIZONA_LDO1_VSEL_MASK,
 156         .min_uV = 900000,
 157         .uV_step = 25000,
 158         .n_voltages = 13,
 159         .enable_time = 500,
 160
 161         .owner = THIS_MODULE,
 162 };
 163
 164 static const struct regulator_init_data arizona_ldo1_dvfs = {
 165         .constraints = {
 166                 .min_uV = 1200000,
 167                 .max_uV = 1800000,
 168                 .valid_ops_mask = REGULATOR_CHANGE_STATUS |
 169                                   REGULATOR_CHANGE_VOLTAGE,
 170         },
 171         .num_consumer_supplies = 1,
 172 };
 173
 174 static const struct regulator_init_data arizona_ldo1_default = {
 175         .constraints = {
 176                 .valid_ops_mask = REGULATOR_CHANGE_STATUS,
 177         },
 178         .num_consumer_supplies = 1,
 179 };
 180
 181 static int arizona_ldo1_of_get_pdata(struct arizona *arizona,
 182                                      struct regulator_config *config,
 183                                      const struct regulator_desc *desc)
 184 {
 185         struct arizona_pdata *pdata = &arizona->pdata;
 186         struct arizona_ldo1 *ldo1 = config->driver_data;
 187         struct device_node *init_node, *dcvdd_node;
 188         struct regulator_init_data *init_data;
 189
 190         pdata->ldoena = arizona_of_get_named_gpio(arizona, "wlf,ldoena", true);
 191
 192         init_node = of_get_child_by_name(arizona->dev->of_node, "ldo1");
 193         dcvdd_node = of_parse_phandle(arizona->dev->of_node, "DCVDD-supply", 0);
 194
 195         if (init_node) {
 196                 config->of_node = init_node;
 197
 198                 init_data = of_get_regulator_init_data(arizona->dev, init_node,
 199                                                        desc);
 200
 201                 if (init_data) {
 202                         init_data->consumer_supplies = &ldo1->supply;
 203                         init_data->num_consumer_supplies = 1;
 204
 205                         if (dcvdd_node && dcvdd_node != init_node)
 206                                 arizona->external_dcvdd = true;
 207
 208                         pdata->ldo1 = init_data;
 209                 }
 210         } else if (dcvdd_node) {
 211                 arizona->external_dcvdd = true;
 212         }
 213
 214         of_node_put(dcvdd_node);
 215
 216         return 0;
 217 }
 218
 219 static int arizona_ldo1_probe(struct platform_device *pdev)
 220 {
 221         struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
 222         const struct regulator_desc *desc;
 223         struct regulator_config config = { };
 224         struct arizona_ldo1 *ldo1;
 225         int ret;
 226
 227         arizona->external_dcvdd = false;
 228
 229         ldo1 = devm_kzalloc(&pdev->dev, sizeof(*ldo1), GFP_KERNEL);
 230         if (!ldo1)
 231                 return -ENOMEM;
 232
 233         ldo1->arizona = arizona;
 234
 235         /*
 236          * Since the chip usually supplies itself we provide some
 237          * default init_data for it.  This will be overridden with
 238          * platform data if provided.
 239          */
 240         switch (arizona->type) {
 241         case WM5102:
 242         case WM8997:
 243                 desc = &arizona_ldo1_hc;
 244                 ldo1->init_data = arizona_ldo1_dvfs;
 245                 break;
 246         default:
 247                 desc = &arizona_ldo1;
 248                 ldo1->init_data = arizona_ldo1_default;
 249                 break;
 250         }
 251
 252         ldo1->init_data.consumer_supplies = &ldo1->supply;
 253         ldo1->supply.supply = "DCVDD";
 254         ldo1->supply.dev_name = dev_name(arizona->dev);
 255
 256         config.dev = arizona->dev;
 257         config.driver_data = ldo1;
 258         config.regmap = arizona->regmap;
 259
 260         if (IS_ENABLED(CONFIG_OF)) {
 261                 if (!dev_get_platdata(arizona->dev)) {
 262                         ret = arizona_ldo1_of_get_pdata(arizona, &config, desc);
 263                         if (ret < 0)
 264                                 return ret;
 265
 266                         config.ena_gpio_initialized = true;
 267                 }
 268         }
 269
 270         config.ena_gpio = arizona->pdata.ldoena;
 271
 272         if (arizona->pdata.ldo1)
 273                 config.init_data = arizona->pdata.ldo1;
 274         else
 275                 config.init_data = &ldo1->init_data;
 276
 277         /*
 278          * LDO1 can only be used to supply DCVDD so if it has no
 279          * consumers then DCVDD is supplied externally.
 280          */
 281         if (config.init_data->num_consumer_supplies == 0)
 282                 arizona->external_dcvdd = true;
 283
 284         ldo1->regulator = devm_regulator_register(&pdev->dev, desc, &config);
 285
 286         of_node_put(config.of_node);
 287
 288         if (IS_ERR(ldo1->regulator)) {
 289                 ret = PTR_ERR(ldo1->regulator);
 290                 dev_err(arizona->dev, "Failed to register LDO1 supply: %d\n",
 291                         ret);
 292                 return ret;
 293         }
 294
 295         platform_set_drvdata(pdev, ldo1);
 296
 297         return 0;
 298 }
 299
 300 static struct platform_driver arizona_ldo1_driver = {
 301         .probe = arizona_ldo1_probe,
 302         .driver         = {
 303                 .name   = "arizona-ldo1",
 304         },
 305 };
 306
 307 module_platform_driver(arizona_ldo1_driver);
 308
 309 /* Module information */
 310 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 311 MODULE_DESCRIPTION("Arizona LDO1 driver");
 312 MODULE_LICENSE("GPL");
 313 MODULE_ALIAS("platform:arizona-ldo1");