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 if (IS_ERR(ldo1->regulator)) { 286 ret = PTR_ERR(ldo1->regulator); 287 dev_err(arizona->dev, "Failed to register LDO1 supply: %d\n", 288 ret); 289 return ret; 290 } 291 292 of_node_put(config.of_node); 293 294 platform_set_drvdata(pdev, ldo1); 295 296 return 0; 297 } 298 299 static struct platform_driver arizona_ldo1_driver = { 300 .probe = arizona_ldo1_probe, 301 .driver = { 302 .name = "arizona-ldo1", 303 }, 304 }; 305 306 module_platform_driver(arizona_ldo1_driver); 307 308 /* Module information */ 309 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 310 MODULE_DESCRIPTION("Arizona LDO1 driver"); 311 MODULE_LICENSE("GPL"); 312 MODULE_ALIAS("platform:arizona-ldo1"); 313