drivers/regulator/mt6397-regulator.c

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