drivers/regulator/da9055-regulator.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 //
   3 // Regulator driver for DA9055 PMIC
   4 //
   5 // Copyright(c) 2012 Dialog Semiconductor Ltd.
   6 //
   7 // Author: David Dajun Chen <dchen@diasemi.com>
   8
   9 #include <linux/module.h>
  10 #include <linux/init.h>
  11 #include <linux/err.h>
  12 #include <linux/gpio.h>
  13 #include <linux/gpio/consumer.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/regulator/driver.h>
  16 #include <linux/regulator/machine.h>
  17 #include <linux/of.h>
  18 #include <linux/regulator/of_regulator.h>
  19
  20 #include <linux/mfd/da9055/core.h>
  21 #include <linux/mfd/da9055/reg.h>
  22 #include <linux/mfd/da9055/pdata.h>
  23
  24 #define DA9055_MIN_UA           0
  25 #define DA9055_MAX_UA           3
  26
  27 #define DA9055_LDO_MODE_SYNC    0
  28 #define DA9055_LDO_MODE_SLEEP   1
  29
  30 #define DA9055_BUCK_MODE_SLEEP  1
  31 #define DA9055_BUCK_MODE_SYNC   2
  32 #define DA9055_BUCK_MODE_AUTO   3
  33
  34 /* DA9055 REGULATOR IDs */
  35 #define DA9055_ID_BUCK1 0
  36 #define DA9055_ID_BUCK2 1
  37 #define DA9055_ID_LDO1          2
  38 #define DA9055_ID_LDO2          3
  39 #define DA9055_ID_LDO3          4
  40 #define DA9055_ID_LDO4          5
  41 #define DA9055_ID_LDO5          6
  42 #define DA9055_ID_LDO6          7
  43
  44 /* DA9055 BUCK current limit */
  45 static const unsigned int da9055_current_limits[] = {
  46         500000, 600000, 700000, 800000
  47 };
  48
  49 struct da9055_conf_reg {
  50         int reg;
  51         int sel_mask;
  52         int en_mask;
  53 };
  54
  55 struct da9055_volt_reg {
  56         int reg_a;
  57         int reg_b;
  58         int sl_shift;
  59         int v_mask;
  60 };
  61
  62 struct da9055_mode_reg {
  63         int reg;
  64         int mask;
  65         int shift;
  66 };
  67
  68 struct da9055_regulator_info {
  69         struct regulator_desc reg_desc;
  70         struct da9055_conf_reg conf;
  71         struct da9055_volt_reg volt;
  72         struct da9055_mode_reg mode;
  73 };
  74
  75 struct da9055_regulator {
  76         struct da9055 *da9055;
  77         struct da9055_regulator_info *info;
  78         struct regulator_dev *rdev;
  79         enum gpio_select reg_rselect;
  80 };
  81
  82 static unsigned int da9055_buck_get_mode(struct regulator_dev *rdev)
  83 {
  84         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
  85         struct da9055_regulator_info *info = regulator->info;
  86         int ret, mode = 0;
  87
  88         ret = da9055_reg_read(regulator->da9055, info->mode.reg);
  89         if (ret < 0)
  90                 return ret;
  91
  92         switch ((ret & info->mode.mask) >> info->mode.shift) {
  93         case DA9055_BUCK_MODE_SYNC:
  94                 mode = REGULATOR_MODE_FAST;
  95                 break;
  96         case DA9055_BUCK_MODE_AUTO:
  97                 mode = REGULATOR_MODE_NORMAL;
  98                 break;
  99         case DA9055_BUCK_MODE_SLEEP:
 100                 mode = REGULATOR_MODE_STANDBY;
 101                 break;
 102         }
 103
 104         return mode;
 105 }
 106
 107 static int da9055_buck_set_mode(struct regulator_dev *rdev,
 108                                         unsigned int mode)
 109 {
 110         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 111         struct da9055_regulator_info *info = regulator->info;
 112         int val = 0;
 113
 114         switch (mode) {
 115         case REGULATOR_MODE_FAST:
 116                 val = DA9055_BUCK_MODE_SYNC << info->mode.shift;
 117                 break;
 118         case REGULATOR_MODE_NORMAL:
 119                 val = DA9055_BUCK_MODE_AUTO << info->mode.shift;
 120                 break;
 121         case REGULATOR_MODE_STANDBY:
 122                 val = DA9055_BUCK_MODE_SLEEP << info->mode.shift;
 123                 break;
 124         }
 125
 126         return da9055_reg_update(regulator->da9055, info->mode.reg,
 127                                  info->mode.mask, val);
 128 }
 129
 130 static unsigned int da9055_ldo_get_mode(struct regulator_dev *rdev)
 131 {
 132         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 133         struct da9055_regulator_info *info = regulator->info;
 134         int ret;
 135
 136         ret = da9055_reg_read(regulator->da9055, info->volt.reg_b);
 137         if (ret < 0)
 138                 return ret;
 139
 140         if (ret >> info->volt.sl_shift)
 141                 return REGULATOR_MODE_STANDBY;
 142         else
 143                 return REGULATOR_MODE_NORMAL;
 144 }
 145
 146 static int da9055_ldo_set_mode(struct regulator_dev *rdev, unsigned int mode)
 147 {
 148         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 149         struct da9055_regulator_info *info = regulator->info;
 150         struct da9055_volt_reg volt = info->volt;
 151         int val = 0;
 152
 153         switch (mode) {
 154         case REGULATOR_MODE_NORMAL:
 155         case REGULATOR_MODE_FAST:
 156                 val = DA9055_LDO_MODE_SYNC;
 157                 break;
 158         case REGULATOR_MODE_STANDBY:
 159                 val = DA9055_LDO_MODE_SLEEP;
 160                 break;
 161         }
 162
 163         return da9055_reg_update(regulator->da9055, volt.reg_b,
 164                                  1 << volt.sl_shift,
 165                                  val << volt.sl_shift);
 166 }
 167
 168 static int da9055_regulator_get_voltage_sel(struct regulator_dev *rdev)
 169 {
 170         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 171         struct da9055_regulator_info *info = regulator->info;
 172         struct da9055_volt_reg volt = info->volt;
 173         int ret, sel;
 174
 175         /*
 176          * There are two voltage register set A & B for voltage ramping but
 177          * either one of then can be active therefore we first determine
 178          * the active register set.
 179          */
 180         ret = da9055_reg_read(regulator->da9055, info->conf.reg);
 181         if (ret < 0)
 182                 return ret;
 183
 184         ret &= info->conf.sel_mask;
 185
 186         /* Get the voltage for the active register set A/B */
 187         if (ret == DA9055_REGUALTOR_SET_A)
 188                 ret = da9055_reg_read(regulator->da9055, volt.reg_a);
 189         else
 190                 ret = da9055_reg_read(regulator->da9055, volt.reg_b);
 191
 192         if (ret < 0)
 193                 return ret;
 194
 195         sel = (ret & volt.v_mask);
 196         return sel;
 197 }
 198
 199 static int da9055_regulator_set_voltage_sel(struct regulator_dev *rdev,
 200                                             unsigned int selector)
 201 {
 202         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 203         struct da9055_regulator_info *info = regulator->info;
 204         int ret;
 205
 206         /*
 207          * Regulator register set A/B is not selected through GPIO therefore
 208          * we use default register set A for voltage ramping.
 209          */
 210         if (regulator->reg_rselect == NO_GPIO) {
 211                 /* Select register set A */
 212                 ret = da9055_reg_update(regulator->da9055, info->conf.reg,
 213                                         info->conf.sel_mask, DA9055_SEL_REG_A);
 214                 if (ret < 0)
 215                         return ret;
 216
 217                 /* Set the voltage */
 218                 return da9055_reg_update(regulator->da9055, info->volt.reg_a,
 219                                          info->volt.v_mask, selector);
 220         }
 221
 222         /*
 223          * Here regulator register set A/B is selected through GPIO.
 224          * Therefore we first determine the selected register set A/B and
 225          * then set the desired voltage for that register set A/B.
 226          */
 227         ret = da9055_reg_read(regulator->da9055, info->conf.reg);
 228         if (ret < 0)
 229                 return ret;
 230
 231         ret &= info->conf.sel_mask;
 232
 233         /* Set the voltage */
 234         if (ret == DA9055_REGUALTOR_SET_A)
 235                 return da9055_reg_update(regulator->da9055, info->volt.reg_a,
 236                                          info->volt.v_mask, selector);
 237         else
 238                 return da9055_reg_update(regulator->da9055, info->volt.reg_b,
 239                                          info->volt.v_mask, selector);
 240 }
 241
 242 static int da9055_regulator_set_suspend_voltage(struct regulator_dev *rdev,
 243                                                 int uV)
 244 {
 245         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 246         struct da9055_regulator_info *info = regulator->info;
 247         int ret;
 248
 249         /* Select register set B for suspend voltage ramping. */
 250         if (regulator->reg_rselect == NO_GPIO) {
 251                 ret = da9055_reg_update(regulator->da9055, info->conf.reg,
 252                                         info->conf.sel_mask, DA9055_SEL_REG_B);
 253                 if (ret < 0)
 254                         return ret;
 255         }
 256
 257         ret = regulator_map_voltage_linear(rdev, uV, uV);
 258         if (ret < 0)
 259                 return ret;
 260
 261         return da9055_reg_update(regulator->da9055, info->volt.reg_b,
 262                                  info->volt.v_mask, ret);
 263 }
 264
 265 static int da9055_suspend_enable(struct regulator_dev *rdev)
 266 {
 267         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 268         struct da9055_regulator_info *info = regulator->info;
 269
 270         /* Select register set B for voltage ramping. */
 271         if (regulator->reg_rselect == NO_GPIO)
 272                 return da9055_reg_update(regulator->da9055, info->conf.reg,
 273                                         info->conf.sel_mask, DA9055_SEL_REG_B);
 274         else
 275                 return 0;
 276 }
 277
 278 static int da9055_suspend_disable(struct regulator_dev *rdev)
 279 {
 280         struct da9055_regulator *regulator = rdev_get_drvdata(rdev);
 281         struct da9055_regulator_info *info = regulator->info;
 282
 283         /* Diselect register set B. */
 284         if (regulator->reg_rselect == NO_GPIO)
 285                 return da9055_reg_update(regulator->da9055, info->conf.reg,
 286                                         info->conf.sel_mask, DA9055_SEL_REG_A);
 287         else
 288                 return 0;
 289 }
 290
 291 static const struct regulator_ops da9055_buck_ops = {
 292         .get_mode = da9055_buck_get_mode,
 293         .set_mode = da9055_buck_set_mode,
 294
 295         .get_current_limit = regulator_get_current_limit_regmap,
 296         .set_current_limit = regulator_set_current_limit_regmap,
 297
 298         .get_voltage_sel = da9055_regulator_get_voltage_sel,
 299         .set_voltage_sel = da9055_regulator_set_voltage_sel,
 300         .list_voltage = regulator_list_voltage_linear,
 301         .map_voltage = regulator_map_voltage_linear,
 302         .is_enabled = regulator_is_enabled_regmap,
 303         .enable = regulator_enable_regmap,
 304         .disable = regulator_disable_regmap,
 305
 306         .set_suspend_voltage = da9055_regulator_set_suspend_voltage,
 307         .set_suspend_enable = da9055_suspend_enable,
 308         .set_suspend_disable = da9055_suspend_disable,
 309         .set_suspend_mode = da9055_buck_set_mode,
 310 };
 311
 312 static const struct regulator_ops da9055_ldo_ops = {
 313         .get_mode = da9055_ldo_get_mode,
 314         .set_mode = da9055_ldo_set_mode,
 315
 316         .get_voltage_sel = da9055_regulator_get_voltage_sel,
 317         .set_voltage_sel = da9055_regulator_set_voltage_sel,
 318         .list_voltage = regulator_list_voltage_linear,
 319         .map_voltage = regulator_map_voltage_linear,
 320         .is_enabled = regulator_is_enabled_regmap,
 321         .enable = regulator_enable_regmap,
 322         .disable = regulator_disable_regmap,
 323
 324         .set_suspend_voltage = da9055_regulator_set_suspend_voltage,
 325         .set_suspend_enable = da9055_suspend_enable,
 326         .set_suspend_disable = da9055_suspend_disable,
 327         .set_suspend_mode = da9055_ldo_set_mode,
 328
 329 };
 330
 331 #define DA9055_LDO(_id, step, min, max, vbits, voffset) \
 332 {\
 333         .reg_desc = {\
 334                 .name = #_id,\
 335                 .of_match = of_match_ptr(#_id),\
 336                 .regulators_node = of_match_ptr("regulators"),\
 337                 .ops = &da9055_ldo_ops,\
 338                 .type = REGULATOR_VOLTAGE,\
 339                 .id = DA9055_ID_##_id,\
 340                 .n_voltages = (max - min) / step + 1 + (voffset), \
 341                 .enable_reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
 342                 .enable_mask = 1, \
 343                 .min_uV = (min) * 1000,\
 344                 .uV_step = (step) * 1000,\
 345                 .linear_min_sel = (voffset),\
 346                 .owner = THIS_MODULE,\
 347         },\
 348         .conf = {\
 349                 .reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
 350                 .sel_mask = (1 << 4),\
 351                 .en_mask = 1,\
 352         },\
 353         .volt = {\
 354                 .reg_a = DA9055_REG_VBCORE_A + DA9055_ID_##_id, \
 355                 .reg_b = DA9055_REG_VBCORE_B + DA9055_ID_##_id, \
 356                 .sl_shift = 7,\
 357                 .v_mask = (1 << (vbits)) - 1,\
 358         },\
 359 }
 360
 361 #define DA9055_BUCK(_id, step, min, max, vbits, voffset, mbits, sbits) \
 362 {\
 363         .reg_desc = {\
 364                 .name = #_id,\
 365                 .of_match = of_match_ptr(#_id),\
 366                 .regulators_node = of_match_ptr("regulators"),\
 367                 .ops = &da9055_buck_ops,\
 368                 .type = REGULATOR_VOLTAGE,\
 369                 .id = DA9055_ID_##_id,\
 370                 .n_voltages = (max - min) / step + 1 + (voffset), \
 371                 .enable_reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
 372                 .enable_mask = 1,\
 373                 .min_uV = (min) * 1000,\
 374                 .uV_step = (step) * 1000,\
 375                 .linear_min_sel = (voffset),\
 376                 .owner = THIS_MODULE,\
 377                 .curr_table = da9055_current_limits,\
 378                 .n_current_limits = ARRAY_SIZE(da9055_current_limits),\
 379                 .csel_reg = DA9055_REG_BUCK_LIM,\
 380                 .csel_mask = (mbits),\
 381         },\
 382         .conf = {\
 383                 .reg = DA9055_REG_BCORE_CONT + DA9055_ID_##_id, \
 384                 .sel_mask = (1 << 4),\
 385                 .en_mask = 1,\
 386         },\
 387         .volt = {\
 388                 .reg_a = DA9055_REG_VBCORE_A + DA9055_ID_##_id, \
 389                 .reg_b = DA9055_REG_VBCORE_B + DA9055_ID_##_id, \
 390                 .sl_shift = 7,\
 391                 .v_mask = (1 << (vbits)) - 1,\
 392         },\
 393         .mode = {\
 394                 .reg = DA9055_REG_BCORE_MODE,\
 395                 .mask = (mbits),\
 396                 .shift = (sbits),\
 397         },\
 398 }
 399
 400 static struct da9055_regulator_info da9055_regulator_info[] = {
 401         DA9055_BUCK(BUCK1, 25, 725, 2075, 6, 9, 0xc, 2),
 402         DA9055_BUCK(BUCK2, 25, 925, 2500, 6, 0, 3, 0),
 403         DA9055_LDO(LDO1, 50, 900, 3300, 6, 2),
 404         DA9055_LDO(LDO2, 50, 900, 3300, 6, 3),
 405         DA9055_LDO(LDO3, 50, 900, 3300, 6, 2),
 406         DA9055_LDO(LDO4, 50, 900, 3300, 6, 2),
 407         DA9055_LDO(LDO5, 50, 900, 2750, 6, 2),
 408         DA9055_LDO(LDO6, 20, 900, 3300, 7, 0),
 409 };
 410
 411 /*
 412  * Configures regulator to be controlled either through GPIO 1 or 2.
 413  * GPIO can control regulator state and/or select the regulator register
 414  * set A/B for voltage ramping.
 415  */
 416 static int da9055_gpio_init(struct da9055_regulator *regulator,
 417                             struct regulator_config *config,
 418                             struct da9055_pdata *pdata, int id)
 419 {
 420         struct da9055_regulator_info *info = regulator->info;
 421         int ret = 0;
 422
 423         if (!pdata)
 424                 return 0;
 425
 426         if (pdata->gpio_ren && pdata->gpio_ren[id]) {
 427                 char name[18];
 428                 int gpio_mux = pdata->gpio_ren[id];
 429
 430                 config->ena_gpiod = pdata->ena_gpiods[id];
 431
 432                 /*
 433                  * GPI pin is muxed with regulator to control the
 434                  * regulator state.
 435                  */
 436                 sprintf(name, "DA9055 GPI %d", gpio_mux);
 437                 ret = devm_gpio_request_one(config->dev, gpio_mux, GPIOF_DIR_IN,
 438                                             name);
 439                 if (ret < 0)
 440                         goto err;
 441
 442                 /*
 443                  * Let the regulator know that its state is controlled
 444                  * through GPI.
 445                  */
 446                 ret = da9055_reg_update(regulator->da9055, info->conf.reg,
 447                                         DA9055_E_GPI_MASK,
 448                                         pdata->reg_ren[id]
 449                                         << DA9055_E_GPI_SHIFT);
 450                 if (ret < 0)
 451                         goto err;
 452         }
 453
 454         if (pdata->gpio_rsel && pdata->gpio_rsel[id]) {
 455                 char name[18];
 456                 int gpio_mux = pdata->gpio_rsel[id];
 457
 458                 regulator->reg_rselect = pdata->reg_rsel[id];
 459
 460                 /*
 461                  * GPI pin is muxed with regulator to select the
 462                  * regulator register set A/B for voltage ramping.
 463                  */
 464                 sprintf(name, "DA9055 GPI %d", gpio_mux);
 465                 ret = devm_gpio_request_one(config->dev, gpio_mux, GPIOF_DIR_IN,
 466                                             name);
 467                 if (ret < 0)
 468                         goto err;
 469
 470                 /*
 471                  * Let the regulator know that its register set A/B
 472                  * will be selected through GPI for voltage ramping.
 473                  */
 474                 ret = da9055_reg_update(regulator->da9055, info->conf.reg,
 475                                         DA9055_V_GPI_MASK,
 476                                         pdata->reg_rsel[id]
 477                                         << DA9055_V_GPI_SHIFT);
 478         }
 479
 480 err:
 481         return ret;
 482 }
 483
 484 static irqreturn_t da9055_ldo5_6_oc_irq(int irq, void *data)
 485 {
 486         struct da9055_regulator *regulator = data;
 487
 488         regulator_notifier_call_chain(regulator->rdev,
 489                                       REGULATOR_EVENT_OVER_CURRENT, NULL);
 490
 491         return IRQ_HANDLED;
 492 }
 493
 494 static inline struct da9055_regulator_info *find_regulator_info(int id)
 495 {
 496         struct da9055_regulator_info *info;
 497         int i;
 498
 499         for (i = 0; i < ARRAY_SIZE(da9055_regulator_info); i++) {
 500                 info = &da9055_regulator_info[i];
 501                 if (info->reg_desc.id == id)
 502                         return info;
 503         }
 504
 505         return NULL;
 506 }
 507
 508 static int da9055_regulator_probe(struct platform_device *pdev)
 509 {
 510         struct regulator_config config = { };
 511         struct da9055_regulator *regulator;
 512         struct da9055 *da9055 = dev_get_drvdata(pdev->dev.parent);
 513         struct da9055_pdata *pdata = dev_get_platdata(da9055->dev);
 514         int ret, irq;
 515
 516         regulator = devm_kzalloc(&pdev->dev, sizeof(struct da9055_regulator),
 517                                  GFP_KERNEL);
 518         if (!regulator)
 519                 return -ENOMEM;
 520
 521         regulator->info = find_regulator_info(pdev->id);
 522         if (regulator->info == NULL) {
 523                 dev_err(&pdev->dev, "invalid regulator ID specified\n");
 524                 return -EINVAL;
 525         }
 526
 527         regulator->da9055 = da9055;
 528         config.dev = da9055->dev;
 529         config.driver_data = regulator;
 530         config.regmap = da9055->regmap;
 531
 532         if (pdata)
 533                 config.init_data = pdata->regulators[pdev->id];
 534
 535         ret = da9055_gpio_init(regulator, &config, pdata, pdev->id);
 536         if (ret < 0)
 537                 return ret;
 538
 539         regulator->rdev = devm_regulator_register(&pdev->dev,
 540                                                   &regulator->info->reg_desc,
 541                                                   &config);
 542         if (IS_ERR(regulator->rdev)) {
 543                 dev_err(&pdev->dev, "Failed to register regulator %s\n",
 544                         regulator->info->reg_desc.name);
 545                 return PTR_ERR(regulator->rdev);
 546         }
 547
 548         /* Only LDO 5 and 6 has got the over current interrupt */
 549         if (pdev->id == DA9055_ID_LDO5 || pdev->id ==  DA9055_ID_LDO6) {
 550                 irq = platform_get_irq_byname(pdev, "REGULATOR");
 551                 if (irq < 0)
 552                         return irq;
 553
 554                 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
 555                                                 da9055_ldo5_6_oc_irq,
 556                                                 IRQF_TRIGGER_HIGH |
 557                                                 IRQF_ONESHOT |
 558                                                 IRQF_PROBE_SHARED,
 559                                                 pdev->name, regulator);
 560                 if (ret != 0) {
 561                         if (ret != -EBUSY) {
 562                                 dev_err(&pdev->dev,
 563                                 "Failed to request Regulator IRQ %d: %d\n",
 564                                 irq, ret);
 565                                 return ret;
 566                         }
 567                 }
 568         }
 569
 570         platform_set_drvdata(pdev, regulator);
 571
 572         return 0;
 573 }
 574
 575 static struct platform_driver da9055_regulator_driver = {
 576         .probe = da9055_regulator_probe,
 577         .driver = {
 578                 .name = "da9055-regulator",
 579                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
 580         },
 581 };
 582
 583 static int __init da9055_regulator_init(void)
 584 {
 585         return platform_driver_register(&da9055_regulator_driver);
 586 }
 587 subsys_initcall(da9055_regulator_init);
 588
 589 static void __exit da9055_regulator_exit(void)
 590 {
 591         platform_driver_unregister(&da9055_regulator_driver);
 592 }
 593 module_exit(da9055_regulator_exit);
 594
 595 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
 596 MODULE_DESCRIPTION("Power Regulator driver for Dialog DA9055 PMIC");
 597 MODULE_LICENSE("GPL");
 598 MODULE_ALIAS("platform:da9055-regulator");