drivers/regulator/act8945a-regulator.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Voltage regulation driver for active-semi ACT8945A PMIC
   4  *
   5  * Copyright (C) 2015 Atmel Corporation
   6  *
   7  * Author: Wenyou Yang <wenyou.yang@atmel.com>
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/of_device.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/regmap.h>
  14 #include <linux/regulator/driver.h>
  15 #include <linux/regulator/machine.h>
  16 #include <dt-bindings/regulator/active-semi,8945a-regulator.h>
  17
  18 /**
  19  * ACT8945A Global Register Map.
  20  */
  21 #define ACT8945A_SYS_MODE       0x00
  22 #define ACT8945A_SYS_CTRL       0x01
  23 #define ACT8945A_SYS_UNLK_REGS  0x0b
  24 #define ACT8945A_DCDC1_VSET1    0x20
  25 #define ACT8945A_DCDC1_VSET2    0x21
  26 #define ACT8945A_DCDC1_CTRL     0x22
  27 #define ACT8945A_DCDC1_SUS      0x24
  28 #define ACT8945A_DCDC2_VSET1    0x30
  29 #define ACT8945A_DCDC2_VSET2    0x31
  30 #define ACT8945A_DCDC2_CTRL     0x32
  31 #define ACT8945A_DCDC2_SUS      0x34
  32 #define ACT8945A_DCDC3_VSET1    0x40
  33 #define ACT8945A_DCDC3_VSET2    0x41
  34 #define ACT8945A_DCDC3_CTRL     0x42
  35 #define ACT8945A_DCDC3_SUS      0x44
  36 #define ACT8945A_LDO1_VSET      0x50
  37 #define ACT8945A_LDO1_CTRL      0x51
  38 #define ACT8945A_LDO1_SUS       0x52
  39 #define ACT8945A_LDO2_VSET      0x54
  40 #define ACT8945A_LDO2_CTRL      0x55
  41 #define ACT8945A_LDO2_SUS       0x56
  42 #define ACT8945A_LDO3_VSET      0x60
  43 #define ACT8945A_LDO3_CTRL      0x61
  44 #define ACT8945A_LDO3_SUS       0x62
  45 #define ACT8945A_LDO4_VSET      0x64
  46 #define ACT8945A_LDO4_CTRL      0x65
  47 #define ACT8945A_LDO4_SUS       0x66
  48
  49 /**
  50  * Field Definitions.
  51  */
  52 #define ACT8945A_ENA            0x80    /* ON - [7] */
  53 #define ACT8945A_VSEL_MASK      0x3F    /* VSET - [5:0] */
  54
  55 /**
  56  * ACT8945A Voltage Number
  57  */
  58 #define ACT8945A_VOLTAGE_NUM    64
  59
  60 enum {
  61         ACT8945A_ID_DCDC1,
  62         ACT8945A_ID_DCDC2,
  63         ACT8945A_ID_DCDC3,
  64         ACT8945A_ID_LDO1,
  65         ACT8945A_ID_LDO2,
  66         ACT8945A_ID_LDO3,
  67         ACT8945A_ID_LDO4,
  68         ACT8945A_ID_MAX,
  69 };
  70
  71 struct act8945a_pmic {
  72         struct regmap *regmap;
  73         u32 op_mode[ACT8945A_ID_MAX];
  74 };
  75
  76 static const struct linear_range act8945a_voltage_ranges[] = {
  77         REGULATOR_LINEAR_RANGE(600000, 0, 23, 25000),
  78         REGULATOR_LINEAR_RANGE(1200000, 24, 47, 50000),
  79         REGULATOR_LINEAR_RANGE(2400000, 48, 63, 100000),
  80 };
  81
  82 static int act8945a_set_suspend_state(struct regulator_dev *rdev, bool enable)
  83 {
  84         struct regmap *regmap = rdev->regmap;
  85         int id = rdev_get_id(rdev);
  86         int reg, val;
  87
  88         switch (id) {
  89         case ACT8945A_ID_DCDC1:
  90                 reg = ACT8945A_DCDC1_SUS;
  91                 val = 0xa8;
  92                 break;
  93         case ACT8945A_ID_DCDC2:
  94                 reg = ACT8945A_DCDC2_SUS;
  95                 val = 0xa8;
  96                 break;
  97         case ACT8945A_ID_DCDC3:
  98                 reg = ACT8945A_DCDC3_SUS;
  99                 val = 0xa8;
 100                 break;
 101         case ACT8945A_ID_LDO1:
 102                 reg = ACT8945A_LDO1_SUS;
 103                 val = 0xe8;
 104                 break;
 105         case ACT8945A_ID_LDO2:
 106                 reg = ACT8945A_LDO2_SUS;
 107                 val = 0xe8;
 108                 break;
 109         case ACT8945A_ID_LDO3:
 110                 reg = ACT8945A_LDO3_SUS;
 111                 val = 0xe8;
 112                 break;
 113         case ACT8945A_ID_LDO4:
 114                 reg = ACT8945A_LDO4_SUS;
 115                 val = 0xe8;
 116                 break;
 117         default:
 118                 return -EINVAL;
 119         }
 120
 121         if (enable)
 122                 val |= BIT(4);
 123
 124         /*
 125          * Ask the PMIC to enable/disable this output when entering hibernate
 126          * mode.
 127          */
 128         return regmap_write(regmap, reg, val);
 129 }
 130
 131 static int act8945a_set_suspend_enable(struct regulator_dev *rdev)
 132 {
 133         return act8945a_set_suspend_state(rdev, true);
 134 }
 135
 136 static int act8945a_set_suspend_disable(struct regulator_dev *rdev)
 137 {
 138         return act8945a_set_suspend_state(rdev, false);
 139 }
 140
 141 static unsigned int act8945a_of_map_mode(unsigned int mode)
 142 {
 143         switch (mode) {
 144         case ACT8945A_REGULATOR_MODE_FIXED:
 145         case ACT8945A_REGULATOR_MODE_NORMAL:
 146                 return REGULATOR_MODE_NORMAL;
 147         case ACT8945A_REGULATOR_MODE_LOWPOWER:
 148                 return REGULATOR_MODE_STANDBY;
 149         default:
 150                 return REGULATOR_MODE_INVALID;
 151         }
 152 }
 153
 154 static int act8945a_set_mode(struct regulator_dev *rdev, unsigned int mode)
 155 {
 156         struct act8945a_pmic *act8945a = rdev_get_drvdata(rdev);
 157         struct regmap *regmap = rdev->regmap;
 158         int id = rdev_get_id(rdev);
 159         int reg, ret, val = 0;
 160
 161         switch (id) {
 162         case ACT8945A_ID_DCDC1:
 163                 reg = ACT8945A_DCDC1_CTRL;
 164                 break;
 165         case ACT8945A_ID_DCDC2:
 166                 reg = ACT8945A_DCDC2_CTRL;
 167                 break;
 168         case ACT8945A_ID_DCDC3:
 169                 reg = ACT8945A_DCDC3_CTRL;
 170                 break;
 171         case ACT8945A_ID_LDO1:
 172                 reg = ACT8945A_LDO1_CTRL;
 173                 break;
 174         case ACT8945A_ID_LDO2:
 175                 reg = ACT8945A_LDO2_CTRL;
 176                 break;
 177         case ACT8945A_ID_LDO3:
 178                 reg = ACT8945A_LDO3_CTRL;
 179                 break;
 180         case ACT8945A_ID_LDO4:
 181                 reg = ACT8945A_LDO4_CTRL;
 182                 break;
 183         default:
 184                 return -EINVAL;
 185         }
 186
 187         switch (mode) {
 188         case REGULATOR_MODE_STANDBY:
 189                 if (id > ACT8945A_ID_DCDC3)
 190                         val = BIT(5);
 191                 break;
 192         case REGULATOR_MODE_NORMAL:
 193                 if (id <= ACT8945A_ID_DCDC3)
 194                         val = BIT(5);
 195                 break;
 196         default:
 197                 return -EINVAL;
 198         }
 199
 200         ret = regmap_update_bits(regmap, reg, BIT(5), val);
 201         if (ret)
 202                 return ret;
 203
 204         act8945a->op_mode[id] = mode;
 205
 206         return 0;
 207 }
 208
 209 static unsigned int act8945a_get_mode(struct regulator_dev *rdev)
 210 {
 211         struct act8945a_pmic *act8945a = rdev_get_drvdata(rdev);
 212         int id = rdev_get_id(rdev);
 213
 214         if (id < ACT8945A_ID_DCDC1 || id >= ACT8945A_ID_MAX)
 215                 return -EINVAL;
 216
 217         return act8945a->op_mode[id];
 218 }
 219
 220 static const struct regulator_ops act8945a_ops = {
 221         .list_voltage           = regulator_list_voltage_linear_range,
 222         .map_voltage            = regulator_map_voltage_linear_range,
 223         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 224         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 225         .enable                 = regulator_enable_regmap,
 226         .disable                = regulator_disable_regmap,
 227         .set_mode               = act8945a_set_mode,
 228         .get_mode               = act8945a_get_mode,
 229         .is_enabled             = regulator_is_enabled_regmap,
 230         .set_suspend_enable     = act8945a_set_suspend_enable,
 231         .set_suspend_disable    = act8945a_set_suspend_disable,
 232 };
 233
 234 #define ACT89xx_REG(_name, _family, _id, _vsel_reg, _supply)            \
 235         [_family##_ID_##_id] = {                                        \
 236                 .name                   = _name,                        \
 237                 .supply_name            = _supply,                      \
 238                 .of_match               = of_match_ptr("REG_"#_id),     \
 239                 .of_map_mode            = act8945a_of_map_mode,         \
 240                 .regulators_node        = of_match_ptr("regulators"),   \
 241                 .id                     = _family##_ID_##_id,           \
 242                 .type                   = REGULATOR_VOLTAGE,            \
 243                 .ops                    = &act8945a_ops,                \
 244                 .n_voltages             = ACT8945A_VOLTAGE_NUM,         \
 245                 .linear_ranges          = act8945a_voltage_ranges,      \
 246                 .n_linear_ranges        = ARRAY_SIZE(act8945a_voltage_ranges), \
 247                 .vsel_reg               = _family##_##_id##_##_vsel_reg, \
 248                 .vsel_mask              = ACT8945A_VSEL_MASK,           \
 249                 .enable_reg             = _family##_##_id##_CTRL,       \
 250                 .enable_mask            = ACT8945A_ENA,                 \
 251                 .owner                  = THIS_MODULE,                  \
 252         }
 253
 254 static const struct regulator_desc act8945a_regulators[] = {
 255         ACT89xx_REG("DCDC_REG1", ACT8945A, DCDC1, VSET1, "vp1"),
 256         ACT89xx_REG("DCDC_REG2", ACT8945A, DCDC2, VSET1, "vp2"),
 257         ACT89xx_REG("DCDC_REG3", ACT8945A, DCDC3, VSET1, "vp3"),
 258         ACT89xx_REG("LDO_REG1", ACT8945A, LDO1, VSET, "inl45"),
 259         ACT89xx_REG("LDO_REG2", ACT8945A, LDO2, VSET, "inl45"),
 260         ACT89xx_REG("LDO_REG3", ACT8945A, LDO3, VSET, "inl67"),
 261         ACT89xx_REG("LDO_REG4", ACT8945A, LDO4, VSET, "inl67"),
 262 };
 263
 264 static const struct regulator_desc act8945a_alt_regulators[] = {
 265         ACT89xx_REG("DCDC_REG1", ACT8945A, DCDC1, VSET2, "vp1"),
 266         ACT89xx_REG("DCDC_REG2", ACT8945A, DCDC2, VSET2, "vp2"),
 267         ACT89xx_REG("DCDC_REG3", ACT8945A, DCDC3, VSET2, "vp3"),
 268         ACT89xx_REG("LDO_REG1", ACT8945A, LDO1, VSET, "inl45"),
 269         ACT89xx_REG("LDO_REG2", ACT8945A, LDO2, VSET, "inl45"),
 270         ACT89xx_REG("LDO_REG3", ACT8945A, LDO3, VSET, "inl67"),
 271         ACT89xx_REG("LDO_REG4", ACT8945A, LDO4, VSET, "inl67"),
 272 };
 273
 274 static int act8945a_pmic_probe(struct platform_device *pdev)
 275 {
 276         struct regulator_config config = { };
 277         const struct regulator_desc *regulators;
 278         struct act8945a_pmic *act8945a;
 279         struct regulator_dev *rdev;
 280         int i, num_regulators;
 281         bool voltage_select;
 282
 283         act8945a = devm_kzalloc(&pdev->dev, sizeof(*act8945a), GFP_KERNEL);
 284         if (!act8945a)
 285                 return -ENOMEM;
 286
 287         act8945a->regmap = dev_get_regmap(pdev->dev.parent, NULL);
 288         if (!act8945a->regmap) {
 289                 dev_err(&pdev->dev,
 290                         "could not retrieve regmap from parent device\n");
 291                 return -EINVAL;
 292         }
 293
 294         voltage_select = of_property_read_bool(pdev->dev.parent->of_node,
 295                                                "active-semi,vsel-high");
 296
 297         if (voltage_select) {
 298                 regulators = act8945a_alt_regulators;
 299                 num_regulators = ARRAY_SIZE(act8945a_alt_regulators);
 300         } else {
 301                 regulators = act8945a_regulators;
 302                 num_regulators = ARRAY_SIZE(act8945a_regulators);
 303         }
 304
 305         config.dev = &pdev->dev;
 306         config.dev->of_node = pdev->dev.parent->of_node;
 307         config.driver_data = act8945a;
 308         for (i = 0; i < num_regulators; i++) {
 309                 rdev = devm_regulator_register(&pdev->dev, &regulators[i],
 310                                                &config);
 311                 if (IS_ERR(rdev)) {
 312                         dev_err(&pdev->dev,
 313                                 "failed to register %s regulator\n",
 314                                 regulators[i].name);
 315                         return PTR_ERR(rdev);
 316                 }
 317         }
 318
 319         platform_set_drvdata(pdev, act8945a);
 320
 321         /* Unlock expert registers. */
 322         return regmap_write(act8945a->regmap, ACT8945A_SYS_UNLK_REGS, 0xef);
 323 }
 324
 325 static int __maybe_unused act8945a_suspend(struct device *pdev)
 326 {
 327         struct act8945a_pmic *act8945a = dev_get_drvdata(pdev);
 328
 329         /*
 330          * Ask the PMIC to enter the suspend mode on the next PWRHLD
 331          * transition.
 332          */
 333         return regmap_write(act8945a->regmap, ACT8945A_SYS_CTRL, 0x42);
 334 }
 335
 336 static SIMPLE_DEV_PM_OPS(act8945a_pm, act8945a_suspend, NULL);
 337
 338 static void act8945a_pmic_shutdown(struct platform_device *pdev)
 339 {
 340         struct act8945a_pmic *act8945a = platform_get_drvdata(pdev);
 341
 342         /*
 343          * Ask the PMIC to shutdown everything on the next PWRHLD transition.
 344          */
 345         regmap_write(act8945a->regmap, ACT8945A_SYS_CTRL, 0x0);
 346 }
 347
 348 static struct platform_driver act8945a_pmic_driver = {
 349         .driver = {
 350                 .name = "act8945a-regulator",
 351                 .pm = &act8945a_pm,
 352         },
 353         .probe = act8945a_pmic_probe,
 354         .shutdown = act8945a_pmic_shutdown,
 355 };
 356 module_platform_driver(act8945a_pmic_driver);
 357
 358 MODULE_DESCRIPTION("Active-semi ACT8945A voltage regulator driver");
 359 MODULE_AUTHOR("Wenyou Yang <wenyou.yang@atmel.com>");
 360 MODULE_LICENSE("GPL");