drivers/regulator/mt6315-regulator.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 //
   3 // Copyright (c) 2021 MediaTek Inc.
   4
   5 #include <linux/module.h>
   6 #include <linux/of_device.h>
   7 #include <linux/regmap.h>
   8 #include <linux/regulator/driver.h>
   9 #include <linux/regulator/machine.h>
  10 #include <linux/regulator/mt6315-regulator.h>
  11 #include <linux/regulator/of_regulator.h>
  12 #include <linux/spmi.h>
  13
  14 #define MT6315_BUCK_MODE_AUTO           0
  15 #define MT6315_BUCK_MODE_FORCE_PWM      1
  16 #define MT6315_BUCK_MODE_LP             2
  17
  18 struct mt6315_regulator_info {
  19         struct regulator_desc desc;
  20         u32 status_reg;
  21         u32 lp_mode_mask;
  22         u32 lp_mode_shift;
  23 };
  24
  25 struct mt_regulator_init_data {
  26         u32 modeset_mask[MT6315_VBUCK_MAX];
  27 };
  28
  29 struct mt6315_chip {
  30         struct device *dev;
  31         struct regmap *regmap;
  32 };
  33
  34 #define MT_BUCK(_name, _bid, _vsel)                             \
  35 [_bid] = {                                                      \
  36         .desc = {                                               \
  37                 .name = _name,                                  \
  38                 .of_match = of_match_ptr(_name),                \
  39                 .regulators_node = "regulators",                \
  40                 .ops = &mt6315_volt_range_ops,                  \
  41                 .type = REGULATOR_VOLTAGE,                      \
  42                 .id = _bid,                                     \
  43                 .owner = THIS_MODULE,                           \
  44                 .n_voltages = 0xc0,                             \
  45                 .linear_ranges = mt_volt_range1,                \
  46                 .n_linear_ranges = ARRAY_SIZE(mt_volt_range1),  \
  47                 .vsel_reg = _vsel,                              \
  48                 .vsel_mask = 0xff,                              \
  49                 .enable_reg = MT6315_BUCK_TOP_CON0,             \
  50                 .enable_mask = BIT(_bid),                       \
  51                 .of_map_mode = mt6315_map_mode,                 \
  52         },                                                      \
  53         .status_reg = _bid##_DBG4,                              \
  54         .lp_mode_mask = BIT(_bid),                              \
  55         .lp_mode_shift = _bid,                                  \
  56 }
  57
  58 static const struct linear_range mt_volt_range1[] = {
  59         REGULATOR_LINEAR_RANGE(0, 0, 0xbf, 6250),
  60 };
  61
  62 static unsigned int mt6315_map_mode(unsigned int mode)
  63 {
  64         switch (mode) {
  65         case MT6315_BUCK_MODE_AUTO:
  66                 return REGULATOR_MODE_NORMAL;
  67         case MT6315_BUCK_MODE_FORCE_PWM:
  68                 return REGULATOR_MODE_FAST;
  69         case MT6315_BUCK_MODE_LP:
  70                 return REGULATOR_MODE_IDLE;
  71         default:
  72                 return REGULATOR_MODE_INVALID;
  73         }
  74 }
  75
  76 static unsigned int mt6315_regulator_get_mode(struct regulator_dev *rdev)
  77 {
  78         struct mt_regulator_init_data *init = rdev_get_drvdata(rdev);
  79         const struct mt6315_regulator_info *info;
  80         int ret, regval;
  81         u32 modeset_mask;
  82
  83         info = container_of(rdev->desc, struct mt6315_regulator_info, desc);
  84         modeset_mask = init->modeset_mask[rdev_get_id(rdev)];
  85         ret = regmap_read(rdev->regmap, MT6315_BUCK_TOP_4PHASE_ANA_CON42, &regval);
  86         if (ret != 0) {
  87                 dev_notice(&rdev->dev, "Failed to get mode: %d\n", ret);
  88                 return ret;
  89         }
  90
  91         if ((regval & modeset_mask) == modeset_mask)
  92                 return REGULATOR_MODE_FAST;
  93
  94         ret = regmap_read(rdev->regmap, MT6315_BUCK_TOP_CON1, &regval);
  95         if (ret != 0) {
  96                 dev_notice(&rdev->dev, "Failed to get lp mode: %d\n", ret);
  97                 return ret;
  98         }
  99
 100         if (regval & info->lp_mode_mask)
 101                 return REGULATOR_MODE_IDLE;
 102         else
 103                 return REGULATOR_MODE_NORMAL;
 104 }
 105
 106 static int mt6315_regulator_set_mode(struct regulator_dev *rdev,
 107                                      u32 mode)
 108 {
 109         struct mt_regulator_init_data *init = rdev_get_drvdata(rdev);
 110         const struct mt6315_regulator_info *info;
 111         int ret, val, curr_mode;
 112         u32 modeset_mask;
 113
 114         info = container_of(rdev->desc, struct mt6315_regulator_info, desc);
 115         modeset_mask = init->modeset_mask[rdev_get_id(rdev)];
 116         curr_mode = mt6315_regulator_get_mode(rdev);
 117         switch (mode) {
 118         case REGULATOR_MODE_FAST:
 119                 ret = regmap_update_bits(rdev->regmap,
 120                                          MT6315_BUCK_TOP_4PHASE_ANA_CON42,
 121                                          modeset_mask,
 122                                          modeset_mask);
 123                 break;
 124         case REGULATOR_MODE_NORMAL:
 125                 if (curr_mode == REGULATOR_MODE_FAST) {
 126                         ret = regmap_update_bits(rdev->regmap,
 127                                                  MT6315_BUCK_TOP_4PHASE_ANA_CON42,
 128                                                  modeset_mask,
 129                                                  0);
 130                 } else if (curr_mode == REGULATOR_MODE_IDLE) {
 131                         ret = regmap_update_bits(rdev->regmap,
 132                                                  MT6315_BUCK_TOP_CON1,
 133                                                  info->lp_mode_mask,
 134                                                  0);
 135                         usleep_range(100, 110);
 136                 } else {
 137                         ret = -EINVAL;
 138                 }
 139                 break;
 140         case REGULATOR_MODE_IDLE:
 141                 val = MT6315_BUCK_MODE_LP >> 1;
 142                 val <<= info->lp_mode_shift;
 143                 ret = regmap_update_bits(rdev->regmap,
 144                                          MT6315_BUCK_TOP_CON1,
 145                                          info->lp_mode_mask,
 146                                          val);
 147                 break;
 148         default:
 149                 ret = -EINVAL;
 150                 dev_notice(&rdev->dev, "Unsupported mode: %d\n", mode);
 151                 break;
 152         }
 153
 154         if (ret != 0) {
 155                 dev_notice(&rdev->dev, "Failed to set mode: %d\n", ret);
 156                 return ret;
 157         }
 158
 159         return 0;
 160 }
 161
 162 static int mt6315_get_status(struct regulator_dev *rdev)
 163 {
 164         const struct mt6315_regulator_info *info;
 165         int ret;
 166         u32 regval;
 167
 168         info = container_of(rdev->desc, struct mt6315_regulator_info, desc);
 169         ret = regmap_read(rdev->regmap, info->status_reg, &regval);
 170         if (ret < 0) {
 171                 dev_notice(&rdev->dev, "Failed to get enable reg: %d\n", ret);
 172                 return ret;
 173         }
 174
 175         return (regval & BIT(0)) ? REGULATOR_STATUS_ON : REGULATOR_STATUS_OFF;
 176 }
 177
 178 static const struct regulator_ops mt6315_volt_range_ops = {
 179         .list_voltage = regulator_list_voltage_linear_range,
 180         .map_voltage = regulator_map_voltage_linear_range,
 181         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 182         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 183         .set_voltage_time_sel = regulator_set_voltage_time_sel,
 184         .enable = regulator_enable_regmap,
 185         .disable = regulator_disable_regmap,
 186         .is_enabled = regulator_is_enabled_regmap,
 187         .get_status = mt6315_get_status,
 188         .set_mode = mt6315_regulator_set_mode,
 189         .get_mode = mt6315_regulator_get_mode,
 190 };
 191
 192 static const struct mt6315_regulator_info mt6315_regulators[MT6315_VBUCK_MAX] = {
 193         MT_BUCK("vbuck1", MT6315_VBUCK1, MT6315_BUCK_TOP_ELR0),
 194         MT_BUCK("vbuck2", MT6315_VBUCK2, MT6315_BUCK_TOP_ELR2),
 195         MT_BUCK("vbuck3", MT6315_VBUCK3, MT6315_BUCK_TOP_ELR4),
 196         MT_BUCK("vbuck4", MT6315_VBUCK4, MT6315_BUCK_TOP_ELR6),
 197 };
 198
 199 static const struct regmap_config mt6315_regmap_config = {
 200         .reg_bits       = 16,
 201         .val_bits       = 8,
 202         .max_register   = 0x16d0,
 203         .fast_io        = true,
 204 };
 205
 206 static const struct of_device_id mt6315_of_match[] = {
 207         {
 208                 .compatible = "mediatek,mt6315-regulator",
 209         }, {
 210                 /* sentinel */
 211         },
 212 };
 213 MODULE_DEVICE_TABLE(of, mt6315_of_match);
 214
 215 static int mt6315_regulator_probe(struct spmi_device *pdev)
 216 {
 217         struct device *dev = &pdev->dev;
 218         struct regmap *regmap;
 219         struct mt6315_chip *chip;
 220         struct mt_regulator_init_data *init_data;
 221         struct regulator_config config = {};
 222         struct regulator_dev *rdev;
 223         int i;
 224
 225         regmap = devm_regmap_init_spmi_ext(pdev, &mt6315_regmap_config);
 226         if (!regmap)
 227                 return -ENODEV;
 228
 229         chip = devm_kzalloc(dev, sizeof(struct mt6315_chip), GFP_KERNEL);
 230         if (!chip)
 231                 return -ENOMEM;
 232
 233         init_data = devm_kzalloc(dev, sizeof(struct mt_regulator_init_data), GFP_KERNEL);
 234         if (!init_data)
 235                 return -ENOMEM;
 236
 237         switch (pdev->usid) {
 238         case MT6315_PP:
 239                 init_data->modeset_mask[MT6315_VBUCK1] = BIT(MT6315_VBUCK1) | BIT(MT6315_VBUCK2) |
 240                                                          BIT(MT6315_VBUCK4);
 241                 break;
 242         case MT6315_SP:
 243         case MT6315_RP:
 244                 init_data->modeset_mask[MT6315_VBUCK1] = BIT(MT6315_VBUCK1) | BIT(MT6315_VBUCK2);
 245                 break;
 246         default:
 247                 init_data->modeset_mask[MT6315_VBUCK1] = BIT(MT6315_VBUCK1);
 248                 break;
 249         }
 250         for (i = MT6315_VBUCK2; i < MT6315_VBUCK_MAX; i++)
 251                 init_data->modeset_mask[i] = BIT(i);
 252
 253         chip->dev = dev;
 254         chip->regmap = regmap;
 255         dev_set_drvdata(dev, chip);
 256
 257         config.dev = dev;
 258         config.regmap = regmap;
 259         for (i = MT6315_VBUCK1; i < MT6315_VBUCK_MAX; i++) {
 260                 config.driver_data = init_data;
 261                 rdev = devm_regulator_register(dev, &mt6315_regulators[i].desc, &config);
 262                 if (IS_ERR(rdev)) {
 263                         dev_notice(dev, "Failed to register %s\n", mt6315_regulators[i].desc.name);
 264                         continue;
 265                 }
 266         }
 267
 268         return 0;
 269 }
 270
 271 static void mt6315_regulator_shutdown(struct spmi_device *pdev)
 272 {
 273         struct mt6315_chip *chip = dev_get_drvdata(&pdev->dev);
 274         int ret = 0;
 275
 276         ret |= regmap_write(chip->regmap, MT6315_TOP_TMA_KEY_H, PROTECTION_KEY_H);
 277         ret |= regmap_write(chip->regmap, MT6315_TOP_TMA_KEY, PROTECTION_KEY);
 278         ret |= regmap_update_bits(chip->regmap, MT6315_TOP2_ELR7, 1, 1);
 279         ret |= regmap_write(chip->regmap, MT6315_TOP_TMA_KEY, 0);
 280         ret |= regmap_write(chip->regmap, MT6315_TOP_TMA_KEY_H, 0);
 281         if (ret < 0)
 282                 dev_notice(&pdev->dev, "[%#x] Failed to enable power off sequence. %d\n",
 283                            pdev->usid, ret);
 284 }
 285
 286 static struct spmi_driver mt6315_regulator_driver = {
 287         .driver         = {
 288                 .name   = "mt6315-regulator",
 289                 .of_match_table = mt6315_of_match,
 290         },
 291         .probe = mt6315_regulator_probe,
 292         .shutdown = mt6315_regulator_shutdown,
 293 };
 294
 295 module_spmi_driver(mt6315_regulator_driver);
 296
 297 MODULE_AUTHOR("Hsin-Hsiung Wang <hsin-hsiung.wang@mediatek.com>");
 298 MODULE_DESCRIPTION("Regulator Driver for MediaTek MT6315 PMIC");
 299 MODULE_LICENSE("GPL");