drivers/regulator/mt6397-regulator.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 //
   3 // Copyright (c) 2014 MediaTek Inc.
   4 // Author: Flora Fu <flora.fu@mediatek.com>
   5
   6 #include <linux/module.h>
   7 #include <linux/of.h>
   8 #include <linux/platform_device.h>
   9 #include <linux/regmap.h>
  10 #include <linux/mfd/mt6397/core.h>
  11 #include <linux/mfd/mt6397/registers.h>
  12 #include <linux/regulator/driver.h>
  13 #include <linux/regulator/machine.h>
  14 #include <linux/regulator/mt6397-regulator.h>
  15 #include <linux/regulator/of_regulator.h>
  16 #include <dt-bindings/regulator/mediatek,mt6397-regulator.h>
  17
  18 /*
  19  * MT6397 regulators' information
  20  *
  21  * @desc: standard fields of regulator description.
  22  * @qi: Mask for query enable signal status of regulators
  23  * @vselon_reg: Register sections for hardware control mode of bucks
  24  * @vselctrl_reg: Register for controlling the buck control mode.
  25  * @vselctrl_mask: Mask for query buck's voltage control mode.
  26  */
  27 struct mt6397_regulator_info {
  28         struct regulator_desc desc;
  29         u32 qi;
  30         u32 vselon_reg;
  31         u32 vselctrl_reg;
  32         u32 vselctrl_mask;
  33         u32 modeset_reg;
  34         u32 modeset_mask;
  35 };
  36
  37 #define MT6397_BUCK(match, vreg, min, max, step, volt_ranges, enreg,    \
  38                 vosel, vosel_mask, voselon, vosel_ctrl, _modeset_reg,   \
  39                 _modeset_shift)                                 \
  40 [MT6397_ID_##vreg] = {                                                  \
  41         .desc = {                                                       \
  42                 .name = #vreg,                                          \
  43                 .of_match = of_match_ptr(match),                        \
  44                 .ops = &mt6397_volt_range_ops,                          \
  45                 .type = REGULATOR_VOLTAGE,                              \
  46                 .id = MT6397_ID_##vreg,                                 \
  47                 .owner = THIS_MODULE,                                   \
  48                 .n_voltages = (max - min)/step + 1,                     \
  49                 .linear_ranges = volt_ranges,                           \
  50                 .n_linear_ranges = ARRAY_SIZE(volt_ranges),             \
  51                 .vsel_reg = vosel,                                      \
  52                 .vsel_mask = vosel_mask,                                \
  53                 .enable_reg = enreg,                                    \
  54                 .enable_mask = BIT(0),                                  \
  55                 .of_map_mode = mt6397_map_mode,                         \
  56         },                                                              \
  57         .qi = BIT(13),                                                  \
  58         .vselon_reg = voselon,                                          \
  59         .vselctrl_reg = vosel_ctrl,                                     \
  60         .vselctrl_mask = BIT(1),                                        \
  61         .modeset_reg = _modeset_reg,                                    \
  62         .modeset_mask = BIT(_modeset_shift),                            \
  63 }
  64
  65 #define MT6397_LDO(match, vreg, ldo_volt_table, enreg, enbit, vosel,    \
  66                 vosel_mask)                                             \
  67 [MT6397_ID_##vreg] = {                                                  \
  68         .desc = {                                                       \
  69                 .name = #vreg,                                          \
  70                 .of_match = of_match_ptr(match),                        \
  71                 .ops = &mt6397_volt_table_ops,                          \
  72                 .type = REGULATOR_VOLTAGE,                              \
  73                 .id = MT6397_ID_##vreg,                                 \
  74                 .owner = THIS_MODULE,                                   \
  75                 .n_voltages = ARRAY_SIZE(ldo_volt_table),               \
  76                 .volt_table = ldo_volt_table,                           \
  77                 .vsel_reg = vosel,                                      \
  78                 .vsel_mask = vosel_mask,                                \
  79                 .enable_reg = enreg,                                    \
  80                 .enable_mask = BIT(enbit),                              \
  81         },                                                              \
  82         .qi = BIT(15),                                                  \
  83 }
  84
  85 #define MT6397_REG_FIXED(match, vreg, enreg, enbit, volt)               \
  86 [MT6397_ID_##vreg] = {                                                  \
  87         .desc = {                                                       \
  88                 .name = #vreg,                                          \
  89                 .of_match = of_match_ptr(match),                        \
  90                 .ops = &mt6397_volt_fixed_ops,                          \
  91                 .type = REGULATOR_VOLTAGE,                              \
  92                 .id = MT6397_ID_##vreg,                                 \
  93                 .owner = THIS_MODULE,                                   \
  94                 .n_voltages = 1,                                        \
  95                 .enable_reg = enreg,                                    \
  96                 .enable_mask = BIT(enbit),                              \
  97                 .min_uV = volt,                                         \
  98         },                                                              \
  99         .qi = BIT(15),                                                  \
 100 }
 101
 102 static const struct linear_range buck_volt_range1[] = {
 103         REGULATOR_LINEAR_RANGE(700000, 0, 0x7f, 6250),
 104 };
 105
 106 static const struct linear_range buck_volt_range2[] = {
 107         REGULATOR_LINEAR_RANGE(800000, 0, 0x7f, 6250),
 108 };
 109
 110 static const struct linear_range buck_volt_range3[] = {
 111         REGULATOR_LINEAR_RANGE(1500000, 0, 0x1f, 20000),
 112 };
 113
 114 static const unsigned int ldo_volt_table1[] = {
 115         1500000, 1800000, 2500000, 2800000,
 116 };
 117
 118 static const unsigned int ldo_volt_table2[] = {
 119         1800000, 3300000,
 120 };
 121
 122 static const unsigned int ldo_volt_table3[] = {
 123         3000000, 3300000,
 124 };
 125
 126 static const unsigned int ldo_volt_table4[] = {
 127         1220000, 1300000, 1500000, 1800000, 2500000, 2800000, 3000000, 3300000,
 128 };
 129
 130 static const unsigned int ldo_volt_table5[] = {
 131         1200000, 1300000, 1500000, 1800000, 2500000, 2800000, 3000000, 3300000,
 132 };
 133
 134 static const unsigned int ldo_volt_table5_v2[] = {
 135         1200000, 1000000, 1500000, 1800000, 2500000, 2800000, 3000000, 3300000,
 136 };
 137
 138 static const unsigned int ldo_volt_table6[] = {
 139         1200000, 1300000, 1500000, 1800000, 2500000, 2800000, 3000000, 2000000,
 140 };
 141
 142 static const unsigned int ldo_volt_table7[] = {
 143         1300000, 1500000, 1800000, 2000000, 2500000, 2800000, 3000000, 3300000,
 144 };
 145
 146 static unsigned int mt6397_map_mode(unsigned int mode)
 147 {
 148         switch (mode) {
 149         case MT6397_BUCK_MODE_AUTO:
 150                 return REGULATOR_MODE_NORMAL;
 151         case MT6397_BUCK_MODE_FORCE_PWM:
 152                 return REGULATOR_MODE_FAST;
 153         default:
 154                 return REGULATOR_MODE_INVALID;
 155         }
 156 }
 157
 158 static int mt6397_regulator_set_mode(struct regulator_dev *rdev,
 159                                      unsigned int mode)
 160 {
 161         struct mt6397_regulator_info *info = rdev_get_drvdata(rdev);
 162         int ret, val;
 163
 164         switch (mode) {
 165         case REGULATOR_MODE_FAST:
 166                 val = MT6397_BUCK_MODE_FORCE_PWM;
 167                 break;
 168         case REGULATOR_MODE_NORMAL:
 169                 val = MT6397_BUCK_MODE_AUTO;
 170                 break;
 171         default:
 172                 ret = -EINVAL;
 173                 goto err_mode;
 174         }
 175
 176         dev_dbg(&rdev->dev, "mt6397 buck set_mode %#x, %#x, %#x\n",
 177                 info->modeset_reg, info->modeset_mask, val);
 178
 179         val <<= ffs(info->modeset_mask) - 1;
 180
 181         ret = regmap_update_bits(rdev->regmap, info->modeset_reg,
 182                                  info->modeset_mask, val);
 183 err_mode:
 184         if (ret != 0) {
 185                 dev_err(&rdev->dev,
 186                         "Failed to set mt6397 buck mode: %d\n", ret);
 187                 return ret;
 188         }
 189
 190         return 0;
 191 }
 192
 193 static unsigned int mt6397_regulator_get_mode(struct regulator_dev *rdev)
 194 {
 195         struct mt6397_regulator_info *info = rdev_get_drvdata(rdev);
 196         int ret, regval;
 197
 198         ret = regmap_read(rdev->regmap, info->modeset_reg, &regval);
 199         if (ret != 0) {
 200                 dev_err(&rdev->dev,
 201                         "Failed to get mt6397 buck mode: %d\n", ret);
 202                 return ret;
 203         }
 204
 205         regval &= info->modeset_mask;
 206         regval >>= ffs(info->modeset_mask) - 1;
 207
 208         switch (regval) {
 209         case MT6397_BUCK_MODE_AUTO:
 210                 return REGULATOR_MODE_NORMAL;
 211         case MT6397_BUCK_MODE_FORCE_PWM:
 212                 return REGULATOR_MODE_FAST;
 213         default:
 214                 return -EINVAL;
 215         }
 216 }
 217
 218 static int mt6397_get_status(struct regulator_dev *rdev)
 219 {
 220         int ret;
 221         u32 regval;
 222         struct mt6397_regulator_info *info = rdev_get_drvdata(rdev);
 223
 224         ret = regmap_read(rdev->regmap, info->desc.enable_reg, &regval);
 225         if (ret != 0) {
 226                 dev_err(&rdev->dev, "Failed to get enable reg: %d\n", ret);
 227                 return ret;
 228         }
 229
 230         return (regval & info->qi) ? REGULATOR_STATUS_ON : REGULATOR_STATUS_OFF;
 231 }
 232
 233 static const struct regulator_ops mt6397_volt_range_ops = {
 234         .list_voltage = regulator_list_voltage_linear_range,
 235         .map_voltage = regulator_map_voltage_linear_range,
 236         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 237         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 238         .set_voltage_time_sel = regulator_set_voltage_time_sel,
 239         .enable = regulator_enable_regmap,
 240         .disable = regulator_disable_regmap,
 241         .is_enabled = regulator_is_enabled_regmap,
 242         .get_status = mt6397_get_status,
 243         .set_mode = mt6397_regulator_set_mode,
 244         .get_mode = mt6397_regulator_get_mode,
 245 };
 246
 247 static const struct regulator_ops mt6397_volt_table_ops = {
 248         .list_voltage = regulator_list_voltage_table,
 249         .map_voltage = regulator_map_voltage_iterate,
 250         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 251         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 252         .set_voltage_time_sel = regulator_set_voltage_time_sel,
 253         .enable = regulator_enable_regmap,
 254         .disable = regulator_disable_regmap,
 255         .is_enabled = regulator_is_enabled_regmap,
 256         .get_status = mt6397_get_status,
 257 };
 258
 259 static const struct regulator_ops mt6397_volt_fixed_ops = {
 260         .list_voltage = regulator_list_voltage_linear,
 261         .enable = regulator_enable_regmap,
 262         .disable = regulator_disable_regmap,
 263         .is_enabled = regulator_is_enabled_regmap,
 264         .get_status = mt6397_get_status,
 265 };
 266
 267 /* The array is indexed by id(MT6397_ID_XXX) */
 268 static struct mt6397_regulator_info mt6397_regulators[] = {
 269         MT6397_BUCK("buck_vpca15", VPCA15, 700000, 1493750, 6250,
 270                 buck_volt_range1, MT6397_VCA15_CON7, MT6397_VCA15_CON9, 0x7f,
 271                 MT6397_VCA15_CON10, MT6397_VCA15_CON5, MT6397_VCA15_CON2, 11),
 272         MT6397_BUCK("buck_vpca7", VPCA7, 700000, 1493750, 6250,
 273                 buck_volt_range1, MT6397_VPCA7_CON7, MT6397_VPCA7_CON9, 0x7f,
 274                 MT6397_VPCA7_CON10, MT6397_VPCA7_CON5, MT6397_VPCA7_CON2, 8),
 275         MT6397_BUCK("buck_vsramca15", VSRAMCA15, 700000, 1493750, 6250,
 276                 buck_volt_range1, MT6397_VSRMCA15_CON7, MT6397_VSRMCA15_CON9,
 277                 0x7f, MT6397_VSRMCA15_CON10, MT6397_VSRMCA15_CON5,
 278                 MT6397_VSRMCA15_CON2, 8),
 279         MT6397_BUCK("buck_vsramca7", VSRAMCA7, 700000, 1493750, 6250,
 280                 buck_volt_range1, MT6397_VSRMCA7_CON7, MT6397_VSRMCA7_CON9,
 281                 0x7f, MT6397_VSRMCA7_CON10, MT6397_VSRMCA7_CON5,
 282                 MT6397_VSRMCA7_CON2, 8),
 283         MT6397_BUCK("buck_vcore", VCORE, 700000, 1493750, 6250,
 284                 buck_volt_range1, MT6397_VCORE_CON7, MT6397_VCORE_CON9, 0x7f,
 285                 MT6397_VCORE_CON10, MT6397_VCORE_CON5, MT6397_VCORE_CON2, 8),
 286         MT6397_BUCK("buck_vgpu", VGPU, 700000, 1493750, 6250, buck_volt_range1,
 287                 MT6397_VGPU_CON7, MT6397_VGPU_CON9, 0x7f,
 288                 MT6397_VGPU_CON10, MT6397_VGPU_CON5, MT6397_VGPU_CON2, 8),
 289         MT6397_BUCK("buck_vdrm", VDRM, 800000, 1593750, 6250, buck_volt_range2,
 290                 MT6397_VDRM_CON7, MT6397_VDRM_CON9, 0x7f,
 291                 MT6397_VDRM_CON10, MT6397_VDRM_CON5, MT6397_VDRM_CON2, 8),
 292         MT6397_BUCK("buck_vio18", VIO18, 1500000, 2120000, 20000,
 293                 buck_volt_range3, MT6397_VIO18_CON7, MT6397_VIO18_CON9, 0x1f,
 294                 MT6397_VIO18_CON10, MT6397_VIO18_CON5, MT6397_VIO18_CON2, 8),
 295         MT6397_REG_FIXED("ldo_vtcxo", VTCXO, MT6397_ANALDO_CON0, 10, 2800000),
 296         MT6397_REG_FIXED("ldo_va28", VA28, MT6397_ANALDO_CON1, 14, 2800000),
 297         MT6397_LDO("ldo_vcama", VCAMA, ldo_volt_table1,
 298                 MT6397_ANALDO_CON2, 15, MT6397_ANALDO_CON6, 0xC0),
 299         MT6397_REG_FIXED("ldo_vio28", VIO28, MT6397_DIGLDO_CON0, 14, 2800000),
 300         MT6397_REG_FIXED("ldo_vusb", VUSB, MT6397_DIGLDO_CON1, 14, 3300000),
 301         MT6397_LDO("ldo_vmc", VMC, ldo_volt_table2,
 302                 MT6397_DIGLDO_CON2, 12, MT6397_DIGLDO_CON29, 0x10),
 303         MT6397_LDO("ldo_vmch", VMCH, ldo_volt_table3,
 304                 MT6397_DIGLDO_CON3, 14, MT6397_DIGLDO_CON17, 0x80),
 305         MT6397_LDO("ldo_vemc3v3", VEMC3V3, ldo_volt_table3,
 306                 MT6397_DIGLDO_CON4, 14, MT6397_DIGLDO_CON18, 0x10),
 307         MT6397_LDO("ldo_vgp1", VGP1, ldo_volt_table4,
 308                 MT6397_DIGLDO_CON5, 15, MT6397_DIGLDO_CON19, 0xE0),
 309         MT6397_LDO("ldo_vgp2", VGP2, ldo_volt_table5,
 310                 MT6397_DIGLDO_CON6, 15, MT6397_DIGLDO_CON20, 0xE0),
 311         MT6397_LDO("ldo_vgp3", VGP3, ldo_volt_table5,
 312                 MT6397_DIGLDO_CON7, 15, MT6397_DIGLDO_CON21, 0xE0),
 313         MT6397_LDO("ldo_vgp4", VGP4, ldo_volt_table5,
 314                 MT6397_DIGLDO_CON8, 15, MT6397_DIGLDO_CON22, 0xE0),
 315         MT6397_LDO("ldo_vgp5", VGP5, ldo_volt_table6,
 316                 MT6397_DIGLDO_CON9, 15, MT6397_DIGLDO_CON23, 0xE0),
 317         MT6397_LDO("ldo_vgp6", VGP6, ldo_volt_table5,
 318                 MT6397_DIGLDO_CON10, 15, MT6397_DIGLDO_CON33, 0xE0),
 319         MT6397_LDO("ldo_vibr", VIBR, ldo_volt_table7,
 320                 MT6397_DIGLDO_CON24, 15, MT6397_DIGLDO_CON25, 0xE00),
 321 };
 322
 323 static int mt6397_set_buck_vosel_reg(struct platform_device *pdev)
 324 {
 325         struct mt6397_chip *mt6397 = dev_get_drvdata(pdev->dev.parent);
 326         int i;
 327         u32 regval;
 328
 329         for (i = 0; i < MT6397_MAX_REGULATOR; i++) {
 330                 if (mt6397_regulators[i].vselctrl_reg) {
 331                         if (regmap_read(mt6397->regmap,
 332                                 mt6397_regulators[i].vselctrl_reg,
 333                                 &regval) < 0) {
 334                                 dev_err(&pdev->dev,
 335                                         "Failed to read buck ctrl\n");
 336                                 return -EIO;
 337                         }
 338
 339                         if (regval & mt6397_regulators[i].vselctrl_mask) {
 340                                 mt6397_regulators[i].desc.vsel_reg =
 341                                 mt6397_regulators[i].vselon_reg;
 342                         }
 343                 }
 344         }
 345
 346         return 0;
 347 }
 348
 349 static int mt6397_regulator_probe(struct platform_device *pdev)
 350 {
 351         struct mt6397_chip *mt6397 = dev_get_drvdata(pdev->dev.parent);
 352         struct regulator_config config = {};
 353         struct regulator_dev *rdev;
 354         int i;
 355         u32 reg_value, version;
 356
 357         /* Query buck controller to select activated voltage register part */
 358         if (mt6397_set_buck_vosel_reg(pdev))
 359                 return -EIO;
 360
 361         /* Read PMIC chip revision to update constraints and voltage table */
 362         if (regmap_read(mt6397->regmap, MT6397_CID, &reg_value) < 0) {
 363                 dev_err(&pdev->dev, "Failed to read Chip ID\n");
 364                 return -EIO;
 365         }
 366         dev_info(&pdev->dev, "Chip ID = 0x%x\n", reg_value);
 367
 368         version = (reg_value & 0xFF);
 369         switch (version) {
 370         case MT6397_REGULATOR_ID91:
 371                 mt6397_regulators[MT6397_ID_VGP2].desc.volt_table =
 372                 ldo_volt_table5_v2;
 373                 break;
 374         default:
 375                 break;
 376         }
 377
 378         for (i = 0; i < MT6397_MAX_REGULATOR; i++) {
 379                 config.dev = &pdev->dev;
 380                 config.driver_data = &mt6397_regulators[i];
 381                 config.regmap = mt6397->regmap;
 382                 rdev = devm_regulator_register(&pdev->dev,
 383                                 &mt6397_regulators[i].desc, &config);
 384                 if (IS_ERR(rdev)) {
 385                         dev_err(&pdev->dev, "failed to register %s\n",
 386                                 mt6397_regulators[i].desc.name);
 387                         return PTR_ERR(rdev);
 388                 }
 389         }
 390
 391         return 0;
 392 }
 393
 394 static const struct platform_device_id mt6397_platform_ids[] = {
 395         {"mt6397-regulator", 0},
 396         { /* sentinel */ },
 397 };
 398 MODULE_DEVICE_TABLE(platform, mt6397_platform_ids);
 399
 400 static const struct of_device_id mt6397_of_match[] __maybe_unused = {
 401         { .compatible = "mediatek,mt6397-regulator", },
 402         { /* sentinel */ },
 403 };
 404 MODULE_DEVICE_TABLE(of, mt6397_of_match);
 405
 406 static struct platform_driver mt6397_regulator_driver = {
 407         .driver = {
 408                 .name = "mt6397-regulator",
 409                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
 410                 .of_match_table = of_match_ptr(mt6397_of_match),
 411         },
 412         .probe = mt6397_regulator_probe,
 413         .id_table = mt6397_platform_ids,
 414 };
 415
 416 module_platform_driver(mt6397_regulator_driver);
 417
 418 MODULE_AUTHOR("Flora Fu <flora.fu@mediatek.com>");
 419 MODULE_DESCRIPTION("Regulator Driver for MediaTek MT6397 PMIC");
 420 MODULE_LICENSE("GPL");