| 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/platform_device.h> |
| 20 | #include <linux/regulator/driver.h> |
| 21 | #include <linux/regulator/machine.h> |
| 22 | #include <linux/gpio.h> |
| 23 | #include <linux/slab.h> |
| 24 | |
| 25 | #include <linux/mfd/arizona/core.h> |
| 26 | #include <linux/mfd/arizona/pdata.h> |
| 27 | #include <linux/mfd/arizona/registers.h> |
| 28 | |
| 29 | struct arizona_ldo1 { |
| 30 | struct regulator_dev *regulator; |
| 31 | struct arizona *arizona; |
| 32 | |
| 33 | struct regulator_consumer_supply supply; |
| 34 | struct regulator_init_data init_data; |
| 35 | }; |
| 36 | |
| 37 | static int arizona_ldo1_hc_list_voltage(struct regulator_dev *rdev, |
| 38 | unsigned int selector) |
| 39 | { |
| 40 | if (selector >= rdev->desc->n_voltages) |
| 41 | return -EINVAL; |
| 42 | |
| 43 | if (selector == rdev->desc->n_voltages - 1) |
| 44 | return 1800000; |
| 45 | else |
| 46 | return rdev->desc->min_uV + (rdev->desc->uV_step * selector); |
| 47 | } |
| 48 | |
| 49 | static int arizona_ldo1_hc_map_voltage(struct regulator_dev *rdev, |
| 50 | int min_uV, int max_uV) |
| 51 | { |
| 52 | int sel; |
| 53 | |
| 54 | sel = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step); |
| 55 | if (sel >= rdev->desc->n_voltages) |
| 56 | sel = rdev->desc->n_voltages - 1; |
| 57 | |
| 58 | return sel; |
| 59 | } |
| 60 | |
| 61 | static int arizona_ldo1_hc_set_voltage_sel(struct regulator_dev *rdev, |
| 62 | unsigned sel) |
| 63 | { |
| 64 | struct arizona_ldo1 *ldo = rdev_get_drvdata(rdev); |
| 65 | struct regmap *regmap = ldo->arizona->regmap; |
| 66 | unsigned int val; |
| 67 | int ret; |
| 68 | |
| 69 | if (sel == rdev->desc->n_voltages - 1) |
| 70 | val = ARIZONA_LDO1_HI_PWR; |
| 71 | else |
| 72 | val = 0; |
| 73 | |
| 74 | ret = regmap_update_bits(regmap, ARIZONA_LDO1_CONTROL_2, |
| 75 | ARIZONA_LDO1_HI_PWR, val); |
| 76 | if (ret != 0) |
| 77 | return ret; |
| 78 | |
| 79 | ret = regmap_update_bits(regmap, ARIZONA_DYNAMIC_FREQUENCY_SCALING_1, |
| 80 | ARIZONA_SUBSYS_MAX_FREQ, val); |
| 81 | if (ret != 0) |
| 82 | return ret; |
| 83 | |
| 84 | if (val) |
| 85 | return 0; |
| 86 | |
| 87 | val = sel << ARIZONA_LDO1_VSEL_SHIFT; |
| 88 | |
| 89 | return regmap_update_bits(regmap, ARIZONA_LDO1_CONTROL_1, |
| 90 | ARIZONA_LDO1_VSEL_MASK, val); |
| 91 | } |
| 92 | |
| 93 | static int arizona_ldo1_hc_get_voltage_sel(struct regulator_dev *rdev) |
| 94 | { |
| 95 | struct arizona_ldo1 *ldo = rdev_get_drvdata(rdev); |
| 96 | struct regmap *regmap = ldo->arizona->regmap; |
| 97 | unsigned int val; |
| 98 | int ret; |
| 99 | |
| 100 | ret = regmap_read(regmap, ARIZONA_LDO1_CONTROL_2, &val); |
| 101 | if (ret != 0) |
| 102 | return ret; |
| 103 | |
| 104 | if (val & ARIZONA_LDO1_HI_PWR) |
| 105 | return rdev->desc->n_voltages - 1; |
| 106 | |
| 107 | ret = regmap_read(regmap, ARIZONA_LDO1_CONTROL_1, &val); |
| 108 | if (ret != 0) |
| 109 | return ret; |
| 110 | |
| 111 | return (val & ARIZONA_LDO1_VSEL_MASK) >> ARIZONA_LDO1_VSEL_SHIFT; |
| 112 | } |
| 113 | |
| 114 | static struct regulator_ops arizona_ldo1_hc_ops = { |
| 115 | .list_voltage = arizona_ldo1_hc_list_voltage, |
| 116 | .map_voltage = arizona_ldo1_hc_map_voltage, |
| 117 | .get_voltage_sel = arizona_ldo1_hc_get_voltage_sel, |
| 118 | .set_voltage_sel = arizona_ldo1_hc_set_voltage_sel, |
| 119 | .get_bypass = regulator_get_bypass_regmap, |
| 120 | .set_bypass = regulator_set_bypass_regmap, |
| 121 | }; |
| 122 | |
| 123 | static const struct regulator_desc arizona_ldo1_hc = { |
| 124 | .name = "LDO1", |
| 125 | .supply_name = "LDOVDD", |
| 126 | .type = REGULATOR_VOLTAGE, |
| 127 | .ops = &arizona_ldo1_hc_ops, |
| 128 | |
| 129 | .bypass_reg = ARIZONA_LDO1_CONTROL_1, |
| 130 | .bypass_mask = ARIZONA_LDO1_BYPASS, |
| 131 | .min_uV = 900000, |
| 132 | .uV_step = 50000, |
| 133 | .n_voltages = 8, |
| 134 | .enable_time = 1500, |
| 135 | |
| 136 | .owner = THIS_MODULE, |
| 137 | }; |
| 138 | |
| 139 | static struct regulator_ops arizona_ldo1_ops = { |
| 140 | .list_voltage = regulator_list_voltage_linear, |
| 141 | .map_voltage = regulator_map_voltage_linear, |
| 142 | .get_voltage_sel = regulator_get_voltage_sel_regmap, |
| 143 | .set_voltage_sel = regulator_set_voltage_sel_regmap, |
| 144 | }; |
| 145 | |
| 146 | static const struct regulator_desc arizona_ldo1 = { |
| 147 | .name = "LDO1", |
| 148 | .supply_name = "LDOVDD", |
| 149 | .type = REGULATOR_VOLTAGE, |
| 150 | .ops = &arizona_ldo1_ops, |
| 151 | |
| 152 | .vsel_reg = ARIZONA_LDO1_CONTROL_1, |
| 153 | .vsel_mask = ARIZONA_LDO1_VSEL_MASK, |
| 154 | .bypass_reg = ARIZONA_LDO1_CONTROL_1, |
| 155 | .bypass_mask = ARIZONA_LDO1_BYPASS, |
| 156 | .min_uV = 900000, |
| 157 | .uV_step = 50000, |
| 158 | .n_voltages = 7, |
| 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_probe(struct platform_device *pdev) |
| 182 | { |
| 183 | struct arizona *arizona = dev_get_drvdata(pdev->dev.parent); |
| 184 | const struct regulator_desc *desc; |
| 185 | struct regulator_config config = { }; |
| 186 | struct arizona_ldo1 *ldo1; |
| 187 | int ret; |
| 188 | |
| 189 | ldo1 = devm_kzalloc(&pdev->dev, sizeof(*ldo1), GFP_KERNEL); |
| 190 | if (ldo1 == NULL) { |
| 191 | dev_err(&pdev->dev, "Unable to allocate private data\n"); |
| 192 | return -ENOMEM; |
| 193 | } |
| 194 | |
| 195 | ldo1->arizona = arizona; |
| 196 | |
| 197 | /* |
| 198 | * Since the chip usually supplies itself we provide some |
| 199 | * default init_data for it. This will be overridden with |
| 200 | * platform data if provided. |
| 201 | */ |
| 202 | switch (arizona->type) { |
| 203 | case WM5102: |
| 204 | desc = &arizona_ldo1_hc; |
| 205 | ldo1->init_data = arizona_ldo1_dvfs; |
| 206 | break; |
| 207 | default: |
| 208 | desc = &arizona_ldo1; |
| 209 | ldo1->init_data = arizona_ldo1_default; |
| 210 | break; |
| 211 | } |
| 212 | |
| 213 | ldo1->init_data.consumer_supplies = &ldo1->supply; |
| 214 | ldo1->supply.supply = "DCVDD"; |
| 215 | ldo1->supply.dev_name = dev_name(arizona->dev); |
| 216 | |
| 217 | config.dev = arizona->dev; |
| 218 | config.driver_data = ldo1; |
| 219 | config.regmap = arizona->regmap; |
| 220 | config.ena_gpio = arizona->pdata.ldoena; |
| 221 | |
| 222 | if (arizona->pdata.ldo1) |
| 223 | config.init_data = arizona->pdata.ldo1; |
| 224 | else |
| 225 | config.init_data = &ldo1->init_data; |
| 226 | |
| 227 | ldo1->regulator = regulator_register(desc, &config); |
| 228 | if (IS_ERR(ldo1->regulator)) { |
| 229 | ret = PTR_ERR(ldo1->regulator); |
| 230 | dev_err(arizona->dev, "Failed to register LDO1 supply: %d\n", |
| 231 | ret); |
| 232 | return ret; |
| 233 | } |
| 234 | |
| 235 | platform_set_drvdata(pdev, ldo1); |
| 236 | |
| 237 | return 0; |
| 238 | } |
| 239 | |
| 240 | static int arizona_ldo1_remove(struct platform_device *pdev) |
| 241 | { |
| 242 | struct arizona_ldo1 *ldo1 = platform_get_drvdata(pdev); |
| 243 | |
| 244 | regulator_unregister(ldo1->regulator); |
| 245 | |
| 246 | return 0; |
| 247 | } |
| 248 | |
| 249 | static struct platform_driver arizona_ldo1_driver = { |
| 250 | .probe = arizona_ldo1_probe, |
| 251 | .remove = arizona_ldo1_remove, |
| 252 | .driver = { |
| 253 | .name = "arizona-ldo1", |
| 254 | .owner = THIS_MODULE, |
| 255 | }, |
| 256 | }; |
| 257 | |
| 258 | module_platform_driver(arizona_ldo1_driver); |
| 259 | |
| 260 | /* Module information */ |
| 261 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); |
| 262 | MODULE_DESCRIPTION("Arizona LDO1 driver"); |
| 263 | MODULE_LICENSE("GPL"); |
| 264 | MODULE_ALIAS("platform:arizona-ldo1"); |