1 /* 2 * Voltage regulation driver for active-semi ACT8945A PMIC 3 * 4 * Copyright (C) 2015 Atmel Corporation 5 * 6 * Author: Wenyou Yang <wenyou.yang@atmel.com> 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License as 10 * published by the Free Software Foundation; either version 2 of the 11 * License, or (at your option) any later version. 12 * 13 */ 14 15 #include <linux/module.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 <dt-bindings/regulator/active-semi,8945a-regulator.h> 22 23 /** 24 * ACT8945A Global Register Map. 25 */ 26 #define ACT8945A_SYS_MODE 0x00 27 #define ACT8945A_SYS_CTRL 0x01 28 #define ACT8945A_SYS_UNLK_REGS 0x0b 29 #define ACT8945A_DCDC1_VSET1 0x20 30 #define ACT8945A_DCDC1_VSET2 0x21 31 #define ACT8945A_DCDC1_CTRL 0x22 32 #define ACT8945A_DCDC1_SUS 0x24 33 #define ACT8945A_DCDC2_VSET1 0x30 34 #define ACT8945A_DCDC2_VSET2 0x31 35 #define ACT8945A_DCDC2_CTRL 0x32 36 #define ACT8945A_DCDC2_SUS 0x34 37 #define ACT8945A_DCDC3_VSET1 0x40 38 #define ACT8945A_DCDC3_VSET2 0x41 39 #define ACT8945A_DCDC3_CTRL 0x42 40 #define ACT8945A_DCDC3_SUS 0x44 41 #define ACT8945A_LDO1_VSET 0x50 42 #define ACT8945A_LDO1_CTRL 0x51 43 #define ACT8945A_LDO1_SUS 0x52 44 #define ACT8945A_LDO2_VSET 0x54 45 #define ACT8945A_LDO2_CTRL 0x55 46 #define ACT8945A_LDO2_SUS 0x56 47 #define ACT8945A_LDO3_VSET 0x60 48 #define ACT8945A_LDO3_CTRL 0x61 49 #define ACT8945A_LDO3_SUS 0x62 50 #define ACT8945A_LDO4_VSET 0x64 51 #define ACT8945A_LDO4_CTRL 0x65 52 #define ACT8945A_LDO4_SUS 0x66 53 54 /** 55 * Field Definitions. 56 */ 57 #define ACT8945A_ENA 0x80 /* ON - [7] */ 58 #define ACT8945A_VSEL_MASK 0x3F /* VSET - [5:0] */ 59 60 /** 61 * ACT8945A Voltage Number 62 */ 63 #define ACT8945A_VOLTAGE_NUM 64 64 65 enum { 66 ACT8945A_ID_DCDC1, 67 ACT8945A_ID_DCDC2, 68 ACT8945A_ID_DCDC3, 69 ACT8945A_ID_LDO1, 70 ACT8945A_ID_LDO2, 71 ACT8945A_ID_LDO3, 72 ACT8945A_ID_LDO4, 73 ACT8945A_ID_MAX, 74 }; 75 76 struct act8945a_pmic { 77 struct regmap *regmap; 78 u32 op_mode[ACT8945A_ID_MAX]; 79 }; 80 81 static const struct regulator_linear_range act8945a_voltage_ranges[] = { 82 REGULATOR_LINEAR_RANGE(600000, 0, 23, 25000), 83 REGULATOR_LINEAR_RANGE(1200000, 24, 47, 50000), 84 REGULATOR_LINEAR_RANGE(2400000, 48, 63, 100000), 85 }; 86 87 static int act8945a_set_suspend_state(struct regulator_dev *rdev, bool enable) 88 { 89 struct regmap *regmap = rdev->regmap; 90 int id = rdev->desc->id, reg, val; 91 92 switch (id) { 93 case ACT8945A_ID_DCDC1: 94 reg = ACT8945A_DCDC1_SUS; 95 val = 0xa8; 96 break; 97 case ACT8945A_ID_DCDC2: 98 reg = ACT8945A_DCDC2_SUS; 99 val = 0xa8; 100 break; 101 case ACT8945A_ID_DCDC3: 102 reg = ACT8945A_DCDC3_SUS; 103 val = 0xa8; 104 break; 105 case ACT8945A_ID_LDO1: 106 reg = ACT8945A_LDO1_SUS; 107 val = 0xe8; 108 break; 109 case ACT8945A_ID_LDO2: 110 reg = ACT8945A_LDO2_SUS; 111 val = 0xe8; 112 break; 113 case ACT8945A_ID_LDO3: 114 reg = ACT8945A_LDO3_SUS; 115 val = 0xe8; 116 break; 117 case ACT8945A_ID_LDO4: 118 reg = ACT8945A_LDO4_SUS; 119 val = 0xe8; 120 break; 121 default: 122 return -EINVAL; 123 } 124 125 if (enable) 126 val |= BIT(4); 127 128 /* 129 * Ask the PMIC to enable/disable this output when entering hibernate 130 * mode. 131 */ 132 return regmap_write(regmap, reg, val); 133 } 134 135 static int act8945a_set_suspend_enable(struct regulator_dev *rdev) 136 { 137 return act8945a_set_suspend_state(rdev, true); 138 } 139 140 static int act8945a_set_suspend_disable(struct regulator_dev *rdev) 141 { 142 return act8945a_set_suspend_state(rdev, false); 143 } 144 145 static unsigned int act8945a_of_map_mode(unsigned int mode) 146 { 147 switch (mode) { 148 case ACT8945A_REGULATOR_MODE_FIXED: 149 case ACT8945A_REGULATOR_MODE_NORMAL: 150 return REGULATOR_MODE_NORMAL; 151 case ACT8945A_REGULATOR_MODE_LOWPOWER: 152 return REGULATOR_MODE_STANDBY; 153 default: 154 return REGULATOR_MODE_INVALID; 155 } 156 } 157 158 static int act8945a_set_mode(struct regulator_dev *rdev, unsigned int mode) 159 { 160 struct act8945a_pmic *act8945a = rdev_get_drvdata(rdev); 161 struct regmap *regmap = rdev->regmap; 162 int id = rdev->desc->id; 163 int reg, ret, val = 0; 164 165 switch (id) { 166 case ACT8945A_ID_DCDC1: 167 reg = ACT8945A_DCDC1_CTRL; 168 break; 169 case ACT8945A_ID_DCDC2: 170 reg = ACT8945A_DCDC2_CTRL; 171 break; 172 case ACT8945A_ID_DCDC3: 173 reg = ACT8945A_DCDC3_CTRL; 174 break; 175 case ACT8945A_ID_LDO1: 176 reg = ACT8945A_LDO1_SUS; 177 break; 178 case ACT8945A_ID_LDO2: 179 reg = ACT8945A_LDO2_SUS; 180 break; 181 case ACT8945A_ID_LDO3: 182 reg = ACT8945A_LDO3_SUS; 183 break; 184 case ACT8945A_ID_LDO4: 185 reg = ACT8945A_LDO4_SUS; 186 break; 187 default: 188 return -EINVAL; 189 } 190 191 switch (mode) { 192 case REGULATOR_MODE_STANDBY: 193 if (rdev->desc->id > ACT8945A_ID_DCDC3) 194 val = BIT(5); 195 break; 196 case REGULATOR_MODE_NORMAL: 197 if (rdev->desc->id <= ACT8945A_ID_DCDC3) 198 val = BIT(5); 199 break; 200 default: 201 return -EINVAL; 202 } 203 204 ret = regmap_update_bits(regmap, reg, BIT(5), val); 205 if (ret) 206 return ret; 207 208 act8945a->op_mode[id] = mode; 209 210 return 0; 211 } 212 213 static unsigned int act8945a_get_mode(struct regulator_dev *rdev) 214 { 215 struct act8945a_pmic *act8945a = rdev_get_drvdata(rdev); 216 int id = rdev->desc->id; 217 218 if (id < ACT8945A_ID_DCDC1 || id >= ACT8945A_ID_MAX) 219 return -EINVAL; 220 221 return act8945a->op_mode[id]; 222 } 223 224 static const struct regulator_ops act8945a_ops = { 225 .list_voltage = regulator_list_voltage_linear_range, 226 .map_voltage = regulator_map_voltage_linear_range, 227 .get_voltage_sel = regulator_get_voltage_sel_regmap, 228 .set_voltage_sel = regulator_set_voltage_sel_regmap, 229 .enable = regulator_enable_regmap, 230 .disable = regulator_disable_regmap, 231 .set_mode = act8945a_set_mode, 232 .get_mode = act8945a_get_mode, 233 .is_enabled = regulator_is_enabled_regmap, 234 .set_suspend_enable = act8945a_set_suspend_enable, 235 .set_suspend_disable = act8945a_set_suspend_disable, 236 }; 237 238 #define ACT89xx_REG(_name, _family, _id, _vsel_reg, _supply) \ 239 [_family##_ID_##_id] = { \ 240 .name = _name, \ 241 .supply_name = _supply, \ 242 .of_match = of_match_ptr("REG_"#_id), \ 243 .of_map_mode = act8945a_of_map_mode, \ 244 .regulators_node = of_match_ptr("regulators"), \ 245 .id = _family##_ID_##_id, \ 246 .type = REGULATOR_VOLTAGE, \ 247 .ops = &act8945a_ops, \ 248 .n_voltages = ACT8945A_VOLTAGE_NUM, \ 249 .linear_ranges = act8945a_voltage_ranges, \ 250 .n_linear_ranges = ARRAY_SIZE(act8945a_voltage_ranges), \ 251 .vsel_reg = _family##_##_id##_##_vsel_reg, \ 252 .vsel_mask = ACT8945A_VSEL_MASK, \ 253 .enable_reg = _family##_##_id##_CTRL, \ 254 .enable_mask = ACT8945A_ENA, \ 255 .owner = THIS_MODULE, \ 256 } 257 258 static const struct regulator_desc act8945a_regulators[] = { 259 ACT89xx_REG("DCDC_REG1", ACT8945A, DCDC1, VSET1, "vp1"), 260 ACT89xx_REG("DCDC_REG2", ACT8945A, DCDC2, VSET1, "vp2"), 261 ACT89xx_REG("DCDC_REG3", ACT8945A, DCDC3, VSET1, "vp3"), 262 ACT89xx_REG("LDO_REG1", ACT8945A, LDO1, VSET, "inl45"), 263 ACT89xx_REG("LDO_REG2", ACT8945A, LDO2, VSET, "inl45"), 264 ACT89xx_REG("LDO_REG3", ACT8945A, LDO3, VSET, "inl67"), 265 ACT89xx_REG("LDO_REG4", ACT8945A, LDO4, VSET, "inl67"), 266 }; 267 268 static const struct regulator_desc act8945a_alt_regulators[] = { 269 ACT89xx_REG("DCDC_REG1", ACT8945A, DCDC1, VSET2, "vp1"), 270 ACT89xx_REG("DCDC_REG2", ACT8945A, DCDC2, VSET2, "vp2"), 271 ACT89xx_REG("DCDC_REG3", ACT8945A, DCDC3, VSET2, "vp3"), 272 ACT89xx_REG("LDO_REG1", ACT8945A, LDO1, VSET, "inl45"), 273 ACT89xx_REG("LDO_REG2", ACT8945A, LDO2, VSET, "inl45"), 274 ACT89xx_REG("LDO_REG3", ACT8945A, LDO3, VSET, "inl67"), 275 ACT89xx_REG("LDO_REG4", ACT8945A, LDO4, VSET, "inl67"), 276 }; 277 278 static int act8945a_pmic_probe(struct platform_device *pdev) 279 { 280 struct regulator_config config = { }; 281 const struct regulator_desc *regulators; 282 struct act8945a_pmic *act8945a; 283 struct regulator_dev *rdev; 284 int i, num_regulators; 285 bool voltage_select; 286 287 act8945a = devm_kzalloc(&pdev->dev, sizeof(*act8945a), GFP_KERNEL); 288 if (!act8945a) 289 return -ENOMEM; 290 291 act8945a->regmap = dev_get_regmap(pdev->dev.parent, NULL); 292 if (!act8945a->regmap) { 293 dev_err(&pdev->dev, 294 "could not retrieve regmap from parent device\n"); 295 return -EINVAL; 296 } 297 298 voltage_select = of_property_read_bool(pdev->dev.parent->of_node, 299 "active-semi,vsel-high"); 300 301 if (voltage_select) { 302 regulators = act8945a_alt_regulators; 303 num_regulators = ARRAY_SIZE(act8945a_alt_regulators); 304 } else { 305 regulators = act8945a_regulators; 306 num_regulators = ARRAY_SIZE(act8945a_regulators); 307 } 308 309 config.dev = &pdev->dev; 310 config.dev->of_node = pdev->dev.parent->of_node; 311 config.driver_data = act8945a; 312 for (i = 0; i < num_regulators; i++) { 313 rdev = devm_regulator_register(&pdev->dev, ®ulators[i], 314 &config); 315 if (IS_ERR(rdev)) { 316 dev_err(&pdev->dev, 317 "failed to register %s regulator\n", 318 regulators[i].name); 319 return PTR_ERR(rdev); 320 } 321 } 322 323 platform_set_drvdata(pdev, act8945a); 324 325 /* Unlock expert registers. */ 326 return regmap_write(act8945a->regmap, ACT8945A_SYS_UNLK_REGS, 0xef); 327 } 328 329 static int act8945a_suspend(struct device *pdev) 330 { 331 struct act8945a_pmic *act8945a = dev_get_drvdata(pdev); 332 333 /* 334 * Ask the PMIC to enter the suspend mode on the next PWRHLD 335 * transition. 336 */ 337 return regmap_write(act8945a->regmap, ACT8945A_SYS_CTRL, 0x42); 338 } 339 340 SIMPLE_DEV_PM_OPS(act8945a_pm, act8945a_suspend, NULL); 341 342 static struct platform_driver act8945a_pmic_driver = { 343 .driver = { 344 .name = "act8945a-regulator", 345 .pm = &act8945a_pm, 346 }, 347 .probe = act8945a_pmic_probe, 348 }; 349 module_platform_driver(act8945a_pmic_driver); 350 351 MODULE_DESCRIPTION("Active-semi ACT8945A voltage regulator driver"); 352 MODULE_AUTHOR("Wenyou Yang <wenyou.yang@atmel.com>"); 353 MODULE_LICENSE("GPL"); 354