drivers/regulator/fan53555.c

   1 /*
   2  * FAN53555 Fairchild Digitally Programmable TinyBuck Regulator Driver.
   3  *
   4  * Supported Part Numbers:
   5  * FAN53555UC00X/01X/03X/04X/05X
   6  *
   7  * Copyright (c) 2012 Marvell Technology Ltd.
   8  * Yunfan Zhang <yfzhang@marvell.com>
   9  *
  10  * This package is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  *
  14  */
  15 #include <linux/module.h>
  16 #include <linux/param.h>
  17 #include <linux/err.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/regulator/driver.h>
  20 #include <linux/regulator/machine.h>
  21 #include <linux/regulator/of_regulator.h>
  22 #include <linux/of_device.h>
  23 #include <linux/i2c.h>
  24 #include <linux/slab.h>
  25 #include <linux/regmap.h>
  26 #include <linux/regulator/fan53555.h>
  27
  28 /* Voltage setting */
  29 #define FAN53555_VSEL0          0x00
  30 #define FAN53555_VSEL1          0x01
  31 /* Control register */
  32 #define FAN53555_CONTROL        0x02
  33 /* IC Type */
  34 #define FAN53555_ID1            0x03
  35 /* IC mask version */
  36 #define FAN53555_ID2            0x04
  37 /* Monitor register */
  38 #define FAN53555_MONITOR        0x05
  39
  40 /* VSEL bit definitions */
  41 #define VSEL_BUCK_EN    (1 << 7)
  42 #define VSEL_MODE               (1 << 6)
  43 /* Chip ID and Verison */
  44 #define DIE_ID          0x0F    /* ID1 */
  45 #define DIE_REV         0x0F    /* ID2 */
  46 /* Control bit definitions */
  47 #define CTL_OUTPUT_DISCHG       (1 << 7)
  48 #define CTL_SLEW_MASK           (0x7 << 4)
  49 #define CTL_SLEW_SHIFT          4
  50 #define CTL_RESET                       (1 << 2)
  51 #define CTL_MODE_VSEL0_MODE     BIT(0)
  52 #define CTL_MODE_VSEL1_MODE     BIT(1)
  53
  54 #define FAN53555_NVOLTAGES      64      /* Numbers of voltages */
  55 #define FAN53526_NVOLTAGES      128
  56
  57 enum fan53555_vendor {
  58         FAN53526_VENDOR_FAIRCHILD = 0,
  59         FAN53555_VENDOR_FAIRCHILD,
  60         FAN53555_VENDOR_SILERGY,
  61 };
  62
  63 enum {
  64         FAN53526_CHIP_ID_01 = 1,
  65 };
  66
  67 enum {
  68         FAN53526_CHIP_REV_08 = 8,
  69 };
  70
  71 /* IC Type */
  72 enum {
  73         FAN53555_CHIP_ID_00 = 0,
  74         FAN53555_CHIP_ID_01,
  75         FAN53555_CHIP_ID_02,
  76         FAN53555_CHIP_ID_03,
  77         FAN53555_CHIP_ID_04,
  78         FAN53555_CHIP_ID_05,
  79         FAN53555_CHIP_ID_08 = 8,
  80 };
  81
  82 /* IC mask revision */
  83 enum {
  84         FAN53555_CHIP_REV_00 = 0x3,
  85         FAN53555_CHIP_REV_13 = 0xf,
  86 };
  87
  88 enum {
  89         SILERGY_SYR82X = 8,
  90 };
  91
  92 struct fan53555_device_info {
  93         enum fan53555_vendor vendor;
  94         struct regmap *regmap;
  95         struct device *dev;
  96         struct regulator_desc desc;
  97         struct regulator_dev *rdev;
  98         struct regulator_init_data *regulator;
  99         /* IC Type and Rev */
 100         int chip_id;
 101         int chip_rev;
 102         /* Voltage setting register */
 103         unsigned int vol_reg;
 104         unsigned int sleep_reg;
 105         /* Voltage range and step(linear) */
 106         unsigned int vsel_min;
 107         unsigned int vsel_step;
 108         unsigned int vsel_count;
 109         /* Voltage slew rate limiting */
 110         unsigned int slew_rate;
 111         /* Mode */
 112         unsigned int mode_reg;
 113         unsigned int mode_mask;
 114         /* Sleep voltage cache */
 115         unsigned int sleep_vol_cache;
 116 };
 117
 118 static int fan53555_set_suspend_voltage(struct regulator_dev *rdev, int uV)
 119 {
 120         struct fan53555_device_info *di = rdev_get_drvdata(rdev);
 121         int ret;
 122
 123         if (di->sleep_vol_cache == uV)
 124                 return 0;
 125         ret = regulator_map_voltage_linear(rdev, uV, uV);
 126         if (ret < 0)
 127                 return ret;
 128         ret = regmap_update_bits(di->regmap, di->sleep_reg,
 129                                  di->desc.vsel_mask, ret);
 130         if (ret < 0)
 131                 return ret;
 132         /* Cache the sleep voltage setting.
 133          * Might not be the real voltage which is rounded */
 134         di->sleep_vol_cache = uV;
 135
 136         return 0;
 137 }
 138
 139 static int fan53555_set_suspend_enable(struct regulator_dev *rdev)
 140 {
 141         struct fan53555_device_info *di = rdev_get_drvdata(rdev);
 142
 143         return regmap_update_bits(di->regmap, di->sleep_reg,
 144                                   VSEL_BUCK_EN, VSEL_BUCK_EN);
 145 }
 146
 147 static int fan53555_set_suspend_disable(struct regulator_dev *rdev)
 148 {
 149         struct fan53555_device_info *di = rdev_get_drvdata(rdev);
 150
 151         return regmap_update_bits(di->regmap, di->sleep_reg,
 152                                   VSEL_BUCK_EN, 0);
 153 }
 154
 155 static int fan53555_set_mode(struct regulator_dev *rdev, unsigned int mode)
 156 {
 157         struct fan53555_device_info *di = rdev_get_drvdata(rdev);
 158
 159         switch (mode) {
 160         case REGULATOR_MODE_FAST:
 161                 regmap_update_bits(di->regmap, di->mode_reg,
 162                                    di->mode_mask, di->mode_mask);
 163                 break;
 164         case REGULATOR_MODE_NORMAL:
 165                 regmap_update_bits(di->regmap, di->vol_reg, di->mode_mask, 0);
 166                 break;
 167         default:
 168                 return -EINVAL;
 169         }
 170         return 0;
 171 }
 172
 173 static unsigned int fan53555_get_mode(struct regulator_dev *rdev)
 174 {
 175         struct fan53555_device_info *di = rdev_get_drvdata(rdev);
 176         unsigned int val;
 177         int ret = 0;
 178
 179         ret = regmap_read(di->regmap, di->mode_reg, &val);
 180         if (ret < 0)
 181                 return ret;
 182         if (val & di->mode_mask)
 183                 return REGULATOR_MODE_FAST;
 184         else
 185                 return REGULATOR_MODE_NORMAL;
 186 }
 187
 188 static const int slew_rates[] = {
 189         64000,
 190         32000,
 191         16000,
 192          8000,
 193          4000,
 194          2000,
 195          1000,
 196           500,
 197 };
 198
 199 static int fan53555_set_ramp(struct regulator_dev *rdev, int ramp)
 200 {
 201         struct fan53555_device_info *di = rdev_get_drvdata(rdev);
 202         int regval = -1, i;
 203
 204         for (i = 0; i < ARRAY_SIZE(slew_rates); i++) {
 205                 if (ramp <= slew_rates[i])
 206                         regval = i;
 207                 else
 208                         break;
 209         }
 210
 211         if (regval < 0) {
 212                 dev_err(di->dev, "unsupported ramp value %d\n", ramp);
 213                 return -EINVAL;
 214         }
 215
 216         return regmap_update_bits(di->regmap, FAN53555_CONTROL,
 217                                   CTL_SLEW_MASK, regval << CTL_SLEW_SHIFT);
 218 }
 219
 220 static const struct regulator_ops fan53555_regulator_ops = {
 221         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 222         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 223         .set_voltage_time_sel = regulator_set_voltage_time_sel,
 224         .map_voltage = regulator_map_voltage_linear,
 225         .list_voltage = regulator_list_voltage_linear,
 226         .set_suspend_voltage = fan53555_set_suspend_voltage,
 227         .enable = regulator_enable_regmap,
 228         .disable = regulator_disable_regmap,
 229         .is_enabled = regulator_is_enabled_regmap,
 230         .set_mode = fan53555_set_mode,
 231         .get_mode = fan53555_get_mode,
 232         .set_ramp_delay = fan53555_set_ramp,
 233         .set_suspend_enable = fan53555_set_suspend_enable,
 234         .set_suspend_disable = fan53555_set_suspend_disable,
 235 };
 236
 237 static int fan53526_voltages_setup_fairchild(struct fan53555_device_info *di)
 238 {
 239         /* Init voltage range and step */
 240         switch (di->chip_id) {
 241         case FAN53526_CHIP_ID_01:
 242                 switch (di->chip_rev) {
 243                 case FAN53526_CHIP_REV_08:
 244                         di->vsel_min = 600000;
 245                         di->vsel_step = 6250;
 246                         break;
 247                 default:
 248                         dev_err(di->dev,
 249                                 "Chip ID %d with rev %d not supported!\n",
 250                                 di->chip_id, di->chip_rev);
 251                         return -EINVAL;
 252                 }
 253                 break;
 254         default:
 255                 dev_err(di->dev,
 256                         "Chip ID %d not supported!\n", di->chip_id);
 257                 return -EINVAL;
 258         }
 259
 260         di->vsel_count = FAN53526_NVOLTAGES;
 261
 262         return 0;
 263 }
 264
 265 static int fan53555_voltages_setup_fairchild(struct fan53555_device_info *di)
 266 {
 267         /* Init voltage range and step */
 268         switch (di->chip_id) {
 269         case FAN53555_CHIP_ID_00:
 270                 switch (di->chip_rev) {
 271                 case FAN53555_CHIP_REV_00:
 272                         di->vsel_min = 600000;
 273                         di->vsel_step = 10000;
 274                         break;
 275                 case FAN53555_CHIP_REV_13:
 276                         di->vsel_min = 800000;
 277                         di->vsel_step = 10000;
 278                         break;
 279                 default:
 280                         dev_err(di->dev,
 281                                 "Chip ID %d with rev %d not supported!\n",
 282                                 di->chip_id, di->chip_rev);
 283                         return -EINVAL;
 284                 }
 285                 break;
 286         case FAN53555_CHIP_ID_01:
 287         case FAN53555_CHIP_ID_03:
 288         case FAN53555_CHIP_ID_05:
 289         case FAN53555_CHIP_ID_08:
 290                 di->vsel_min = 600000;
 291                 di->vsel_step = 10000;
 292                 break;
 293         case FAN53555_CHIP_ID_04:
 294                 di->vsel_min = 603000;
 295                 di->vsel_step = 12826;
 296                 break;
 297         default:
 298                 dev_err(di->dev,
 299                         "Chip ID %d not supported!\n", di->chip_id);
 300                 return -EINVAL;
 301         }
 302
 303         di->vsel_count = FAN53555_NVOLTAGES;
 304
 305         return 0;
 306 }
 307
 308 static int fan53555_voltages_setup_silergy(struct fan53555_device_info *di)
 309 {
 310         /* Init voltage range and step */
 311         switch (di->chip_id) {
 312         case SILERGY_SYR82X:
 313                 di->vsel_min = 712500;
 314                 di->vsel_step = 12500;
 315                 break;
 316         default:
 317                 dev_err(di->dev,
 318                         "Chip ID %d not supported!\n", di->chip_id);
 319                 return -EINVAL;
 320         }
 321
 322         di->vsel_count = FAN53555_NVOLTAGES;
 323
 324         return 0;
 325 }
 326
 327 /* For 00,01,03,05 options:
 328  * VOUT = 0.60V + NSELx * 10mV, from 0.60 to 1.23V.
 329  * For 04 option:
 330  * VOUT = 0.603V + NSELx * 12.826mV, from 0.603 to 1.411V.
 331  * */
 332 static int fan53555_device_setup(struct fan53555_device_info *di,
 333                                 struct fan53555_platform_data *pdata)
 334 {
 335         int ret = 0;
 336
 337         /* Setup voltage control register */
 338         switch (pdata->sleep_vsel_id) {
 339         case FAN53555_VSEL_ID_0:
 340                 di->sleep_reg = FAN53555_VSEL0;
 341                 di->vol_reg = FAN53555_VSEL1;
 342                 break;
 343         case FAN53555_VSEL_ID_1:
 344                 di->sleep_reg = FAN53555_VSEL1;
 345                 di->vol_reg = FAN53555_VSEL0;
 346                 break;
 347         default:
 348                 dev_err(di->dev, "Invalid VSEL ID!\n");
 349                 return -EINVAL;
 350         }
 351
 352         /* Setup mode control register */
 353         switch (di->vendor) {
 354         case FAN53526_VENDOR_FAIRCHILD:
 355                 di->mode_reg = FAN53555_CONTROL;
 356
 357                 switch (pdata->sleep_vsel_id) {
 358                 case FAN53555_VSEL_ID_0:
 359                         di->mode_mask = CTL_MODE_VSEL1_MODE;
 360                         break;
 361                 case FAN53555_VSEL_ID_1:
 362                         di->mode_mask = CTL_MODE_VSEL0_MODE;
 363                         break;
 364                 }
 365                 break;
 366         case FAN53555_VENDOR_FAIRCHILD:
 367         case FAN53555_VENDOR_SILERGY:
 368                 di->mode_reg = di->vol_reg;
 369                 di->mode_mask = VSEL_MODE;
 370                 break;
 371         default:
 372                 dev_err(di->dev, "vendor %d not supported!\n", di->vendor);
 373                 return -EINVAL;
 374         }
 375
 376         /* Setup voltage range */
 377         switch (di->vendor) {
 378         case FAN53526_VENDOR_FAIRCHILD:
 379                 ret = fan53526_voltages_setup_fairchild(di);
 380                 break;
 381         case FAN53555_VENDOR_FAIRCHILD:
 382                 ret = fan53555_voltages_setup_fairchild(di);
 383                 break;
 384         case FAN53555_VENDOR_SILERGY:
 385                 ret = fan53555_voltages_setup_silergy(di);
 386                 break;
 387         default:
 388                 dev_err(di->dev, "vendor %d not supported!\n", di->vendor);
 389                 return -EINVAL;
 390         }
 391
 392         return ret;
 393 }
 394
 395 static int fan53555_regulator_register(struct fan53555_device_info *di,
 396                         struct regulator_config *config)
 397 {
 398         struct regulator_desc *rdesc = &di->desc;
 399
 400         rdesc->name = "fan53555-reg";
 401         rdesc->supply_name = "vin";
 402         rdesc->ops = &fan53555_regulator_ops;
 403         rdesc->type = REGULATOR_VOLTAGE;
 404         rdesc->n_voltages = di->vsel_count;
 405         rdesc->enable_reg = di->vol_reg;
 406         rdesc->enable_mask = VSEL_BUCK_EN;
 407         rdesc->min_uV = di->vsel_min;
 408         rdesc->uV_step = di->vsel_step;
 409         rdesc->vsel_reg = di->vol_reg;
 410         rdesc->vsel_mask = di->vsel_count - 1;
 411         rdesc->owner = THIS_MODULE;
 412
 413         di->rdev = devm_regulator_register(di->dev, &di->desc, config);
 414         return PTR_ERR_OR_ZERO(di->rdev);
 415 }
 416
 417 static const struct regmap_config fan53555_regmap_config = {
 418         .reg_bits = 8,
 419         .val_bits = 8,
 420 };
 421
 422 static struct fan53555_platform_data *fan53555_parse_dt(struct device *dev,
 423                                               struct device_node *np,
 424                                               const struct regulator_desc *desc)
 425 {
 426         struct fan53555_platform_data *pdata;
 427         int ret;
 428         u32 tmp;
 429
 430         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 431         if (!pdata)
 432                 return NULL;
 433
 434         pdata->regulator = of_get_regulator_init_data(dev, np, desc);
 435
 436         ret = of_property_read_u32(np, "fcs,suspend-voltage-selector",
 437                                    &tmp);
 438         if (!ret)
 439                 pdata->sleep_vsel_id = tmp;
 440
 441         return pdata;
 442 }
 443
 444 static const struct of_device_id fan53555_dt_ids[] = {
 445         {
 446                 .compatible = "fcs,fan53526",
 447                 .data = (void *)FAN53526_VENDOR_FAIRCHILD,
 448         }, {
 449                 .compatible = "fcs,fan53555",
 450                 .data = (void *)FAN53555_VENDOR_FAIRCHILD
 451         }, {
 452                 .compatible = "silergy,syr827",
 453                 .data = (void *)FAN53555_VENDOR_SILERGY,
 454         }, {
 455                 .compatible = "silergy,syr828",
 456                 .data = (void *)FAN53555_VENDOR_SILERGY,
 457         },
 458         { }
 459 };
 460 MODULE_DEVICE_TABLE(of, fan53555_dt_ids);
 461
 462 static int fan53555_regulator_probe(struct i2c_client *client,
 463                                 const struct i2c_device_id *id)
 464 {
 465         struct device_node *np = client->dev.of_node;
 466         struct fan53555_device_info *di;
 467         struct fan53555_platform_data *pdata;
 468         struct regulator_config config = { };
 469         unsigned int val;
 470         int ret;
 471
 472         di = devm_kzalloc(&client->dev, sizeof(struct fan53555_device_info),
 473                                         GFP_KERNEL);
 474         if (!di)
 475                 return -ENOMEM;
 476
 477         pdata = dev_get_platdata(&client->dev);
 478         if (!pdata)
 479                 pdata = fan53555_parse_dt(&client->dev, np, &di->desc);
 480
 481         if (!pdata || !pdata->regulator) {
 482                 dev_err(&client->dev, "Platform data not found!\n");
 483                 return -ENODEV;
 484         }
 485
 486         di->regulator = pdata->regulator;
 487         if (client->dev.of_node) {
 488                 di->vendor =
 489                         (unsigned long)of_device_get_match_data(&client->dev);
 490         } else {
 491                 /* if no ramp constraint set, get the pdata ramp_delay */
 492                 if (!di->regulator->constraints.ramp_delay) {
 493                         if (pdata->slew_rate >= ARRAY_SIZE(slew_rates)) {
 494                                 dev_err(&client->dev, "Invalid slew_rate\n");
 495                                 return -EINVAL;
 496                         }
 497
 498                         di->regulator->constraints.ramp_delay
 499                                         = slew_rates[pdata->slew_rate];
 500                 }
 501
 502                 di->vendor = id->driver_data;
 503         }
 504
 505         di->regmap = devm_regmap_init_i2c(client, &fan53555_regmap_config);
 506         if (IS_ERR(di->regmap)) {
 507                 dev_err(&client->dev, "Failed to allocate regmap!\n");
 508                 return PTR_ERR(di->regmap);
 509         }
 510         di->dev = &client->dev;
 511         i2c_set_clientdata(client, di);
 512         /* Get chip ID */
 513         ret = regmap_read(di->regmap, FAN53555_ID1, &val);
 514         if (ret < 0) {
 515                 dev_err(&client->dev, "Failed to get chip ID!\n");
 516                 return ret;
 517         }
 518         di->chip_id = val & DIE_ID;
 519         /* Get chip revision */
 520         ret = regmap_read(di->regmap, FAN53555_ID2, &val);
 521         if (ret < 0) {
 522                 dev_err(&client->dev, "Failed to get chip Rev!\n");
 523                 return ret;
 524         }
 525         di->chip_rev = val & DIE_REV;
 526         dev_info(&client->dev, "FAN53555 Option[%d] Rev[%d] Detected!\n",
 527                                 di->chip_id, di->chip_rev);
 528         /* Device init */
 529         ret = fan53555_device_setup(di, pdata);
 530         if (ret < 0) {
 531                 dev_err(&client->dev, "Failed to setup device!\n");
 532                 return ret;
 533         }
 534         /* Register regulator */
 535         config.dev = di->dev;
 536         config.init_data = di->regulator;
 537         config.regmap = di->regmap;
 538         config.driver_data = di;
 539         config.of_node = np;
 540
 541         ret = fan53555_regulator_register(di, &config);
 542         if (ret < 0)
 543                 dev_err(&client->dev, "Failed to register regulator!\n");
 544         return ret;
 545
 546 }
 547
 548 static const struct i2c_device_id fan53555_id[] = {
 549         {
 550                 .name = "fan53526",
 551                 .driver_data = FAN53526_VENDOR_FAIRCHILD
 552         }, {
 553                 .name = "fan53555",
 554                 .driver_data = FAN53555_VENDOR_FAIRCHILD
 555         }, {
 556                 .name = "syr827",
 557                 .driver_data = FAN53555_VENDOR_SILERGY
 558         }, {
 559                 .name = "syr828",
 560                 .driver_data = FAN53555_VENDOR_SILERGY
 561         },
 562         { },
 563 };
 564 MODULE_DEVICE_TABLE(i2c, fan53555_id);
 565
 566 static struct i2c_driver fan53555_regulator_driver = {
 567         .driver = {
 568                 .name = "fan53555-regulator",
 569                 .of_match_table = of_match_ptr(fan53555_dt_ids),
 570         },
 571         .probe = fan53555_regulator_probe,
 572         .id_table = fan53555_id,
 573 };
 574
 575 module_i2c_driver(fan53555_regulator_driver);
 576
 577 MODULE_AUTHOR("Yunfan Zhang <yfzhang@marvell.com>");
 578 MODULE_DESCRIPTION("FAN53555 regulator driver");
 579 MODULE_LICENSE("GPL v2");