drivers/regulator/fan53555.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 //
   3 // FAN53555 Fairchild Digitally Programmable TinyBuck Regulator Driver.
   4 //
   5 // Supported Part Numbers:
   6 // FAN53555UC00X/01X/03X/04X/05X
   7 //
   8 // Copyright (c) 2012 Marvell Technology Ltd.
   9 // Yunfan Zhang <yfzhang@marvell.com>
  10
  11 #include <linux/module.h>
  12 #include <linux/param.h>
  13 #include <linux/err.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/regulator/driver.h>
  16 #include <linux/regulator/machine.h>
  17 #include <linux/regulator/of_regulator.h>
  18 #include <linux/of_device.h>
  19 #include <linux/i2c.h>
  20 #include <linux/slab.h>
  21 #include <linux/regmap.h>
  22 #include <linux/regulator/fan53555.h>
  23
  24 /* Voltage setting */
  25 #define FAN53555_VSEL0          0x00
  26 #define FAN53555_VSEL1          0x01
  27 /* Control register */
  28 #define FAN53555_CONTROL        0x02
  29 /* IC Type */
  30 #define FAN53555_ID1            0x03
  31 /* IC mask version */
  32 #define FAN53555_ID2            0x04
  33 /* Monitor register */
  34 #define FAN53555_MONITOR        0x05
  35
  36 /* VSEL bit definitions */
  37 #define VSEL_BUCK_EN    (1 << 7)
  38 #define VSEL_MODE               (1 << 6)
  39 /* Chip ID and Verison */
  40 #define DIE_ID          0x0F    /* ID1 */
  41 #define DIE_REV         0x0F    /* ID2 */
  42 /* Control bit definitions */
  43 #define CTL_OUTPUT_DISCHG       (1 << 7)
  44 #define CTL_SLEW_MASK           (0x7 << 4)
  45 #define CTL_SLEW_SHIFT          4
  46 #define CTL_RESET                       (1 << 2)
  47 #define CTL_MODE_VSEL0_MODE     BIT(0)
  48 #define CTL_MODE_VSEL1_MODE     BIT(1)
  49
  50 #define FAN53555_NVOLTAGES      64      /* Numbers of voltages */
  51 #define FAN53526_NVOLTAGES      128
  52
  53 enum fan53555_vendor {
  54         FAN53526_VENDOR_FAIRCHILD = 0,
  55         FAN53555_VENDOR_FAIRCHILD,
  56         FAN53555_VENDOR_SILERGY,
  57 };
  58
  59 enum {
  60         FAN53526_CHIP_ID_01 = 1,
  61 };
  62
  63 enum {
  64         FAN53526_CHIP_REV_08 = 8,
  65 };
  66
  67 /* IC Type */
  68 enum {
  69         FAN53555_CHIP_ID_00 = 0,
  70         FAN53555_CHIP_ID_01,
  71         FAN53555_CHIP_ID_02,
  72         FAN53555_CHIP_ID_03,
  73         FAN53555_CHIP_ID_04,
  74         FAN53555_CHIP_ID_05,
  75         FAN53555_CHIP_ID_08 = 8,
  76 };
  77
  78 /* IC mask revision */
  79 enum {
  80         FAN53555_CHIP_REV_00 = 0x3,
  81         FAN53555_CHIP_REV_13 = 0xf,
  82 };
  83
  84 enum {
  85         SILERGY_SYR82X = 8,
  86         SILERGY_SYR83X = 9,
  87 };
  88
  89 struct fan53555_device_info {
  90         enum fan53555_vendor vendor;
  91         struct device *dev;
  92         struct regulator_desc desc;
  93         struct regulator_init_data *regulator;
  94         /* IC Type and Rev */
  95         int chip_id;
  96         int chip_rev;
  97         /* Voltage setting register */
  98         unsigned int vol_reg;
  99         unsigned int sleep_reg;
 100         /* Voltage range and step(linear) */
 101         unsigned int vsel_min;
 102         unsigned int vsel_step;
 103         unsigned int vsel_count;
 104         /* Mode */
 105         unsigned int mode_reg;
 106         unsigned int mode_mask;
 107         /* Sleep voltage cache */
 108         unsigned int sleep_vol_cache;
 109 };
 110
 111 static int fan53555_set_suspend_voltage(struct regulator_dev *rdev, int uV)
 112 {
 113         struct fan53555_device_info *di = rdev_get_drvdata(rdev);
 114         int ret;
 115
 116         if (di->sleep_vol_cache == uV)
 117                 return 0;
 118         ret = regulator_map_voltage_linear(rdev, uV, uV);
 119         if (ret < 0)
 120                 return ret;
 121         ret = regmap_update_bits(rdev->regmap, di->sleep_reg,
 122                                  di->desc.vsel_mask, ret);
 123         if (ret < 0)
 124                 return ret;
 125         /* Cache the sleep voltage setting.
 126          * Might not be the real voltage which is rounded */
 127         di->sleep_vol_cache = uV;
 128
 129         return 0;
 130 }
 131
 132 static int fan53555_set_suspend_enable(struct regulator_dev *rdev)
 133 {
 134         struct fan53555_device_info *di = rdev_get_drvdata(rdev);
 135
 136         return regmap_update_bits(rdev->regmap, di->sleep_reg,
 137                                   VSEL_BUCK_EN, VSEL_BUCK_EN);
 138 }
 139
 140 static int fan53555_set_suspend_disable(struct regulator_dev *rdev)
 141 {
 142         struct fan53555_device_info *di = rdev_get_drvdata(rdev);
 143
 144         return regmap_update_bits(rdev->regmap, di->sleep_reg,
 145                                   VSEL_BUCK_EN, 0);
 146 }
 147
 148 static int fan53555_set_mode(struct regulator_dev *rdev, unsigned int mode)
 149 {
 150         struct fan53555_device_info *di = rdev_get_drvdata(rdev);
 151
 152         switch (mode) {
 153         case REGULATOR_MODE_FAST:
 154                 regmap_update_bits(rdev->regmap, di->mode_reg,
 155                                    di->mode_mask, di->mode_mask);
 156                 break;
 157         case REGULATOR_MODE_NORMAL:
 158                 regmap_update_bits(rdev->regmap, di->vol_reg, di->mode_mask, 0);
 159                 break;
 160         default:
 161                 return -EINVAL;
 162         }
 163         return 0;
 164 }
 165
 166 static unsigned int fan53555_get_mode(struct regulator_dev *rdev)
 167 {
 168         struct fan53555_device_info *di = rdev_get_drvdata(rdev);
 169         unsigned int val;
 170         int ret = 0;
 171
 172         ret = regmap_read(rdev->regmap, di->mode_reg, &val);
 173         if (ret < 0)
 174                 return ret;
 175         if (val & di->mode_mask)
 176                 return REGULATOR_MODE_FAST;
 177         else
 178                 return REGULATOR_MODE_NORMAL;
 179 }
 180
 181 static const int slew_rates[] = {
 182         64000,
 183         32000,
 184         16000,
 185          8000,
 186          4000,
 187          2000,
 188          1000,
 189           500,
 190 };
 191
 192 static int fan53555_set_ramp(struct regulator_dev *rdev, int ramp)
 193 {
 194         struct fan53555_device_info *di = rdev_get_drvdata(rdev);
 195         int regval = -1, i;
 196
 197         for (i = 0; i < ARRAY_SIZE(slew_rates); i++) {
 198                 if (ramp <= slew_rates[i])
 199                         regval = i;
 200                 else
 201                         break;
 202         }
 203
 204         if (regval < 0) {
 205                 dev_err(di->dev, "unsupported ramp value %d\n", ramp);
 206                 return -EINVAL;
 207         }
 208
 209         return regmap_update_bits(rdev->regmap, FAN53555_CONTROL,
 210                                   CTL_SLEW_MASK, regval << CTL_SLEW_SHIFT);
 211 }
 212
 213 static const struct regulator_ops fan53555_regulator_ops = {
 214         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 215         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 216         .set_voltage_time_sel = regulator_set_voltage_time_sel,
 217         .map_voltage = regulator_map_voltage_linear,
 218         .list_voltage = regulator_list_voltage_linear,
 219         .set_suspend_voltage = fan53555_set_suspend_voltage,
 220         .enable = regulator_enable_regmap,
 221         .disable = regulator_disable_regmap,
 222         .is_enabled = regulator_is_enabled_regmap,
 223         .set_mode = fan53555_set_mode,
 224         .get_mode = fan53555_get_mode,
 225         .set_ramp_delay = fan53555_set_ramp,
 226         .set_suspend_enable = fan53555_set_suspend_enable,
 227         .set_suspend_disable = fan53555_set_suspend_disable,
 228 };
 229
 230 static int fan53526_voltages_setup_fairchild(struct fan53555_device_info *di)
 231 {
 232         /* Init voltage range and step */
 233         switch (di->chip_id) {
 234         case FAN53526_CHIP_ID_01:
 235                 switch (di->chip_rev) {
 236                 case FAN53526_CHIP_REV_08:
 237                         di->vsel_min = 600000;
 238                         di->vsel_step = 6250;
 239                         break;
 240                 default:
 241                         dev_err(di->dev,
 242                                 "Chip ID %d with rev %d not supported!\n",
 243                                 di->chip_id, di->chip_rev);
 244                         return -EINVAL;
 245                 }
 246                 break;
 247         default:
 248                 dev_err(di->dev,
 249                         "Chip ID %d not supported!\n", di->chip_id);
 250                 return -EINVAL;
 251         }
 252
 253         di->vsel_count = FAN53526_NVOLTAGES;
 254
 255         return 0;
 256 }
 257
 258 static int fan53555_voltages_setup_fairchild(struct fan53555_device_info *di)
 259 {
 260         /* Init voltage range and step */
 261         switch (di->chip_id) {
 262         case FAN53555_CHIP_ID_00:
 263                 switch (di->chip_rev) {
 264                 case FAN53555_CHIP_REV_00:
 265                         di->vsel_min = 600000;
 266                         di->vsel_step = 10000;
 267                         break;
 268                 case FAN53555_CHIP_REV_13:
 269                         di->vsel_min = 800000;
 270                         di->vsel_step = 10000;
 271                         break;
 272                 default:
 273                         dev_err(di->dev,
 274                                 "Chip ID %d with rev %d not supported!\n",
 275                                 di->chip_id, di->chip_rev);
 276                         return -EINVAL;
 277                 }
 278                 break;
 279         case FAN53555_CHIP_ID_01:
 280         case FAN53555_CHIP_ID_03:
 281         case FAN53555_CHIP_ID_05:
 282         case FAN53555_CHIP_ID_08:
 283                 di->vsel_min = 600000;
 284                 di->vsel_step = 10000;
 285                 break;
 286         case FAN53555_CHIP_ID_04:
 287                 di->vsel_min = 603000;
 288                 di->vsel_step = 12826;
 289                 break;
 290         default:
 291                 dev_err(di->dev,
 292                         "Chip ID %d not supported!\n", di->chip_id);
 293                 return -EINVAL;
 294         }
 295
 296         di->vsel_count = FAN53555_NVOLTAGES;
 297
 298         return 0;
 299 }
 300
 301 static int fan53555_voltages_setup_silergy(struct fan53555_device_info *di)
 302 {
 303         /* Init voltage range and step */
 304         switch (di->chip_id) {
 305         case SILERGY_SYR82X:
 306         case SILERGY_SYR83X:
 307                 di->vsel_min = 712500;
 308                 di->vsel_step = 12500;
 309                 break;
 310         default:
 311                 dev_err(di->dev,
 312                         "Chip ID %d not supported!\n", di->chip_id);
 313                 return -EINVAL;
 314         }
 315
 316         di->vsel_count = FAN53555_NVOLTAGES;
 317
 318         return 0;
 319 }
 320
 321 /* For 00,01,03,05 options:
 322  * VOUT = 0.60V + NSELx * 10mV, from 0.60 to 1.23V.
 323  * For 04 option:
 324  * VOUT = 0.603V + NSELx * 12.826mV, from 0.603 to 1.411V.
 325  * */
 326 static int fan53555_device_setup(struct fan53555_device_info *di,
 327                                 struct fan53555_platform_data *pdata)
 328 {
 329         int ret = 0;
 330
 331         /* Setup voltage control register */
 332         switch (pdata->sleep_vsel_id) {
 333         case FAN53555_VSEL_ID_0:
 334                 di->sleep_reg = FAN53555_VSEL0;
 335                 di->vol_reg = FAN53555_VSEL1;
 336                 break;
 337         case FAN53555_VSEL_ID_1:
 338                 di->sleep_reg = FAN53555_VSEL1;
 339                 di->vol_reg = FAN53555_VSEL0;
 340                 break;
 341         default:
 342                 dev_err(di->dev, "Invalid VSEL ID!\n");
 343                 return -EINVAL;
 344         }
 345
 346         /* Setup mode control register */
 347         switch (di->vendor) {
 348         case FAN53526_VENDOR_FAIRCHILD:
 349                 di->mode_reg = FAN53555_CONTROL;
 350
 351                 switch (pdata->sleep_vsel_id) {
 352                 case FAN53555_VSEL_ID_0:
 353                         di->mode_mask = CTL_MODE_VSEL1_MODE;
 354                         break;
 355                 case FAN53555_VSEL_ID_1:
 356                         di->mode_mask = CTL_MODE_VSEL0_MODE;
 357                         break;
 358                 }
 359                 break;
 360         case FAN53555_VENDOR_FAIRCHILD:
 361         case FAN53555_VENDOR_SILERGY:
 362                 di->mode_reg = di->vol_reg;
 363                 di->mode_mask = VSEL_MODE;
 364                 break;
 365         default:
 366                 dev_err(di->dev, "vendor %d not supported!\n", di->vendor);
 367                 return -EINVAL;
 368         }
 369
 370         /* Setup voltage range */
 371         switch (di->vendor) {
 372         case FAN53526_VENDOR_FAIRCHILD:
 373                 ret = fan53526_voltages_setup_fairchild(di);
 374                 break;
 375         case FAN53555_VENDOR_FAIRCHILD:
 376                 ret = fan53555_voltages_setup_fairchild(di);
 377                 break;
 378         case FAN53555_VENDOR_SILERGY:
 379                 ret = fan53555_voltages_setup_silergy(di);
 380                 break;
 381         default:
 382                 dev_err(di->dev, "vendor %d not supported!\n", di->vendor);
 383                 return -EINVAL;
 384         }
 385
 386         return ret;
 387 }
 388
 389 static int fan53555_regulator_register(struct fan53555_device_info *di,
 390                         struct regulator_config *config)
 391 {
 392         struct regulator_desc *rdesc = &di->desc;
 393         struct regulator_dev *rdev;
 394
 395         rdesc->name = "fan53555-reg";
 396         rdesc->supply_name = "vin";
 397         rdesc->ops = &fan53555_regulator_ops;
 398         rdesc->type = REGULATOR_VOLTAGE;
 399         rdesc->n_voltages = di->vsel_count;
 400         rdesc->enable_reg = di->vol_reg;
 401         rdesc->enable_mask = VSEL_BUCK_EN;
 402         rdesc->min_uV = di->vsel_min;
 403         rdesc->uV_step = di->vsel_step;
 404         rdesc->vsel_reg = di->vol_reg;
 405         rdesc->vsel_mask = di->vsel_count - 1;
 406         rdesc->owner = THIS_MODULE;
 407
 408         rdev = devm_regulator_register(di->dev, &di->desc, config);
 409         return PTR_ERR_OR_ZERO(rdev);
 410 }
 411
 412 static const struct regmap_config fan53555_regmap_config = {
 413         .reg_bits = 8,
 414         .val_bits = 8,
 415 };
 416
 417 static struct fan53555_platform_data *fan53555_parse_dt(struct device *dev,
 418                                               struct device_node *np,
 419                                               const struct regulator_desc *desc)
 420 {
 421         struct fan53555_platform_data *pdata;
 422         int ret;
 423         u32 tmp;
 424
 425         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 426         if (!pdata)
 427                 return NULL;
 428
 429         pdata->regulator = of_get_regulator_init_data(dev, np, desc);
 430
 431         ret = of_property_read_u32(np, "fcs,suspend-voltage-selector",
 432                                    &tmp);
 433         if (!ret)
 434                 pdata->sleep_vsel_id = tmp;
 435
 436         return pdata;
 437 }
 438
 439 static const struct of_device_id __maybe_unused fan53555_dt_ids[] = {
 440         {
 441                 .compatible = "fcs,fan53526",
 442                 .data = (void *)FAN53526_VENDOR_FAIRCHILD,
 443         }, {
 444                 .compatible = "fcs,fan53555",
 445                 .data = (void *)FAN53555_VENDOR_FAIRCHILD
 446         }, {
 447                 .compatible = "silergy,syr827",
 448                 .data = (void *)FAN53555_VENDOR_SILERGY,
 449         }, {
 450                 .compatible = "silergy,syr828",
 451                 .data = (void *)FAN53555_VENDOR_SILERGY,
 452         },
 453         { }
 454 };
 455 MODULE_DEVICE_TABLE(of, fan53555_dt_ids);
 456
 457 static int fan53555_regulator_probe(struct i2c_client *client,
 458                                 const struct i2c_device_id *id)
 459 {
 460         struct device_node *np = client->dev.of_node;
 461         struct fan53555_device_info *di;
 462         struct fan53555_platform_data *pdata;
 463         struct regulator_config config = { };
 464         struct regmap *regmap;
 465         unsigned int val;
 466         int ret;
 467
 468         di = devm_kzalloc(&client->dev, sizeof(struct fan53555_device_info),
 469                                         GFP_KERNEL);
 470         if (!di)
 471                 return -ENOMEM;
 472
 473         pdata = dev_get_platdata(&client->dev);
 474         if (!pdata)
 475                 pdata = fan53555_parse_dt(&client->dev, np, &di->desc);
 476
 477         if (!pdata || !pdata->regulator) {
 478                 dev_err(&client->dev, "Platform data not found!\n");
 479                 return -ENODEV;
 480         }
 481
 482         di->regulator = pdata->regulator;
 483         if (client->dev.of_node) {
 484                 di->vendor =
 485                         (unsigned long)of_device_get_match_data(&client->dev);
 486         } else {
 487                 /* if no ramp constraint set, get the pdata ramp_delay */
 488                 if (!di->regulator->constraints.ramp_delay) {
 489                         if (pdata->slew_rate >= ARRAY_SIZE(slew_rates)) {
 490                                 dev_err(&client->dev, "Invalid slew_rate\n");
 491                                 return -EINVAL;
 492                         }
 493
 494                         di->regulator->constraints.ramp_delay
 495                                         = slew_rates[pdata->slew_rate];
 496                 }
 497
 498                 di->vendor = id->driver_data;
 499         }
 500
 501         regmap = devm_regmap_init_i2c(client, &fan53555_regmap_config);
 502         if (IS_ERR(regmap)) {
 503                 dev_err(&client->dev, "Failed to allocate regmap!\n");
 504                 return PTR_ERR(regmap);
 505         }
 506         di->dev = &client->dev;
 507         i2c_set_clientdata(client, di);
 508         /* Get chip ID */
 509         ret = regmap_read(regmap, FAN53555_ID1, &val);
 510         if (ret < 0) {
 511                 dev_err(&client->dev, "Failed to get chip ID!\n");
 512                 return ret;
 513         }
 514         di->chip_id = val & DIE_ID;
 515         /* Get chip revision */
 516         ret = regmap_read(regmap, FAN53555_ID2, &val);
 517         if (ret < 0) {
 518                 dev_err(&client->dev, "Failed to get chip Rev!\n");
 519                 return ret;
 520         }
 521         di->chip_rev = val & DIE_REV;
 522         dev_info(&client->dev, "FAN53555 Option[%d] Rev[%d] Detected!\n",
 523                                 di->chip_id, di->chip_rev);
 524         /* Device init */
 525         ret = fan53555_device_setup(di, pdata);
 526         if (ret < 0) {
 527                 dev_err(&client->dev, "Failed to setup device!\n");
 528                 return ret;
 529         }
 530         /* Register regulator */
 531         config.dev = di->dev;
 532         config.init_data = di->regulator;
 533         config.regmap = regmap;
 534         config.driver_data = di;
 535         config.of_node = np;
 536
 537         ret = fan53555_regulator_register(di, &config);
 538         if (ret < 0)
 539                 dev_err(&client->dev, "Failed to register regulator!\n");
 540         return ret;
 541
 542 }
 543
 544 static const struct i2c_device_id fan53555_id[] = {
 545         {
 546                 .name = "fan53526",
 547                 .driver_data = FAN53526_VENDOR_FAIRCHILD
 548         }, {
 549                 .name = "fan53555",
 550                 .driver_data = FAN53555_VENDOR_FAIRCHILD
 551         }, {
 552                 .name = "syr827",
 553                 .driver_data = FAN53555_VENDOR_SILERGY
 554         }, {
 555                 .name = "syr828",
 556                 .driver_data = FAN53555_VENDOR_SILERGY
 557         },
 558         { },
 559 };
 560 MODULE_DEVICE_TABLE(i2c, fan53555_id);
 561
 562 static struct i2c_driver fan53555_regulator_driver = {
 563         .driver = {
 564                 .name = "fan53555-regulator",
 565                 .of_match_table = of_match_ptr(fan53555_dt_ids),
 566         },
 567         .probe = fan53555_regulator_probe,
 568         .id_table = fan53555_id,
 569 };
 570
 571 module_i2c_driver(fan53555_regulator_driver);
 572
 573 MODULE_AUTHOR("Yunfan Zhang <yfzhang@marvell.com>");
 574 MODULE_DESCRIPTION("FAN53555 regulator driver");
 575 MODULE_LICENSE("GPL v2");