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 #define VSEL_NSEL_MASK  0x3F
  44 /* Chip ID and Verison */
  45 #define DIE_ID          0x0F    /* ID1 */
  46 #define DIE_REV         0x0F    /* ID2 */
  47 /* Control bit definitions */
  48 #define CTL_OUTPUT_DISCHG       (1 << 7)
  49 #define CTL_SLEW_MASK           (0x7 << 4)
  50 #define CTL_SLEW_SHIFT          4
  51 #define CTL_RESET                       (1 << 2)
  52
  53 #define FAN53555_NVOLTAGES      64      /* Numbers of voltages */
  54
  55 enum fan53555_vendor {
  56         FAN53555_VENDOR_FAIRCHILD = 0,
  57         FAN53555_VENDOR_SILERGY,
  58 };
  59
  60 /* IC Type */
  61 enum {
  62         FAN53555_CHIP_ID_00 = 0,
  63         FAN53555_CHIP_ID_01,
  64         FAN53555_CHIP_ID_02,
  65         FAN53555_CHIP_ID_03,
  66         FAN53555_CHIP_ID_04,
  67         FAN53555_CHIP_ID_05,
  68         FAN53555_CHIP_ID_08 = 8,
  69 };
  70
  71 /* IC mask revision */
  72 enum {
  73         FAN53555_CHIP_REV_00 = 0x3,
  74         FAN53555_CHIP_REV_13 = 0xf,
  75 };
  76
  77 enum {
  78         SILERGY_SYR82X = 8,
  79 };
  80
  81 struct fan53555_device_info {
  82         enum fan53555_vendor vendor;
  83         struct regmap *regmap;
  84         struct device *dev;
  85         struct regulator_desc desc;
  86         struct regulator_dev *rdev;
  87         struct regulator_init_data *regulator;
  88         /* IC Type and Rev */
  89         int chip_id;
  90         int chip_rev;
  91         /* Voltage setting register */
  92         unsigned int vol_reg;
  93         unsigned int sleep_reg;
  94         /* Voltage range and step(linear) */
  95         unsigned int vsel_min;
  96         unsigned int vsel_step;
  97         /* Voltage slew rate limiting */
  98         unsigned int slew_rate;
  99         /* Sleep voltage cache */
 100         unsigned int sleep_vol_cache;
 101 };
 102
 103 static int fan53555_set_suspend_voltage(struct regulator_dev *rdev, int uV)
 104 {
 105         struct fan53555_device_info *di = rdev_get_drvdata(rdev);
 106         int ret;
 107
 108         if (di->sleep_vol_cache == uV)
 109                 return 0;
 110         ret = regulator_map_voltage_linear(rdev, uV, uV);
 111         if (ret < 0)
 112                 return ret;
 113         ret = regmap_update_bits(di->regmap, di->sleep_reg,
 114                                         VSEL_NSEL_MASK, ret);
 115         if (ret < 0)
 116                 return ret;
 117         /* Cache the sleep voltage setting.
 118          * Might not be the real voltage which is rounded */
 119         di->sleep_vol_cache = uV;
 120
 121         return 0;
 122 }
 123
 124 static int fan53555_set_suspend_enable(struct regulator_dev *rdev)
 125 {
 126         struct fan53555_device_info *di = rdev_get_drvdata(rdev);
 127
 128         return regmap_update_bits(di->regmap, di->sleep_reg,
 129                                   VSEL_BUCK_EN, VSEL_BUCK_EN);
 130 }
 131
 132 static int fan53555_set_suspend_disable(struct regulator_dev *rdev)
 133 {
 134         struct fan53555_device_info *di = rdev_get_drvdata(rdev);
 135
 136         return regmap_update_bits(di->regmap, di->sleep_reg,
 137                                   VSEL_BUCK_EN, 0);
 138 }
 139
 140 static int fan53555_set_mode(struct regulator_dev *rdev, unsigned int mode)
 141 {
 142         struct fan53555_device_info *di = rdev_get_drvdata(rdev);
 143
 144         switch (mode) {
 145         case REGULATOR_MODE_FAST:
 146                 regmap_update_bits(di->regmap, di->vol_reg,
 147                                 VSEL_MODE, VSEL_MODE);
 148                 break;
 149         case REGULATOR_MODE_NORMAL:
 150                 regmap_update_bits(di->regmap, di->vol_reg, VSEL_MODE, 0);
 151                 break;
 152         default:
 153                 return -EINVAL;
 154         }
 155         return 0;
 156 }
 157
 158 static unsigned int fan53555_get_mode(struct regulator_dev *rdev)
 159 {
 160         struct fan53555_device_info *di = rdev_get_drvdata(rdev);
 161         unsigned int val;
 162         int ret = 0;
 163
 164         ret = regmap_read(di->regmap, di->vol_reg, &val);
 165         if (ret < 0)
 166                 return ret;
 167         if (val & VSEL_MODE)
 168                 return REGULATOR_MODE_FAST;
 169         else
 170                 return REGULATOR_MODE_NORMAL;
 171 }
 172
 173 static const int slew_rates[] = {
 174         64000,
 175         32000,
 176         16000,
 177          8000,
 178          4000,
 179          2000,
 180          1000,
 181           500,
 182 };
 183
 184 static int fan53555_set_ramp(struct regulator_dev *rdev, int ramp)
 185 {
 186         struct fan53555_device_info *di = rdev_get_drvdata(rdev);
 187         int regval = -1, i;
 188
 189         for (i = 0; i < ARRAY_SIZE(slew_rates); i++) {
 190                 if (ramp <= slew_rates[i])
 191                         regval = i;
 192                 else
 193                         break;
 194         }
 195
 196         if (regval < 0) {
 197                 dev_err(di->dev, "unsupported ramp value %d\n", ramp);
 198                 return -EINVAL;
 199         }
 200
 201         return regmap_update_bits(di->regmap, FAN53555_CONTROL,
 202                                   CTL_SLEW_MASK, regval << CTL_SLEW_SHIFT);
 203 }
 204
 205 static struct regulator_ops fan53555_regulator_ops = {
 206         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 207         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 208         .set_voltage_time_sel = regulator_set_voltage_time_sel,
 209         .map_voltage = regulator_map_voltage_linear,
 210         .list_voltage = regulator_list_voltage_linear,
 211         .set_suspend_voltage = fan53555_set_suspend_voltage,
 212         .enable = regulator_enable_regmap,
 213         .disable = regulator_disable_regmap,
 214         .is_enabled = regulator_is_enabled_regmap,
 215         .set_mode = fan53555_set_mode,
 216         .get_mode = fan53555_get_mode,
 217         .set_ramp_delay = fan53555_set_ramp,
 218         .set_suspend_enable = fan53555_set_suspend_enable,
 219         .set_suspend_disable = fan53555_set_suspend_disable,
 220 };
 221
 222 static int fan53555_voltages_setup_fairchild(struct fan53555_device_info *di)
 223 {
 224         /* Init voltage range and step */
 225         switch (di->chip_id) {
 226         case FAN53555_CHIP_ID_00:
 227                 switch (di->chip_rev) {
 228                 case FAN53555_CHIP_REV_00:
 229                         di->vsel_min = 600000;
 230                         di->vsel_step = 10000;
 231                         break;
 232                 case FAN53555_CHIP_REV_13:
 233                         di->vsel_min = 800000;
 234                         di->vsel_step = 10000;
 235                         break;
 236                 default:
 237                         dev_err(di->dev,
 238                                 "Chip ID %d with rev %d not supported!\n",
 239                                 di->chip_id, di->chip_rev);
 240                         return -EINVAL;
 241                 }
 242                 break;
 243         case FAN53555_CHIP_ID_01:
 244         case FAN53555_CHIP_ID_03:
 245         case FAN53555_CHIP_ID_05:
 246         case FAN53555_CHIP_ID_08:
 247                 di->vsel_min = 600000;
 248                 di->vsel_step = 10000;
 249                 break;
 250         case FAN53555_CHIP_ID_04:
 251                 di->vsel_min = 603000;
 252                 di->vsel_step = 12826;
 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         return 0;
 261 }
 262
 263 static int fan53555_voltages_setup_silergy(struct fan53555_device_info *di)
 264 {
 265         /* Init voltage range and step */
 266         switch (di->chip_id) {
 267         case SILERGY_SYR82X:
 268                 di->vsel_min = 712500;
 269                 di->vsel_step = 12500;
 270                 break;
 271         default:
 272                 dev_err(di->dev,
 273                         "Chip ID %d not supported!\n", di->chip_id);
 274                 return -EINVAL;
 275         }
 276
 277         return 0;
 278 }
 279
 280 /* For 00,01,03,05 options:
 281  * VOUT = 0.60V + NSELx * 10mV, from 0.60 to 1.23V.
 282  * For 04 option:
 283  * VOUT = 0.603V + NSELx * 12.826mV, from 0.603 to 1.411V.
 284  * */
 285 static int fan53555_device_setup(struct fan53555_device_info *di,
 286                                 struct fan53555_platform_data *pdata)
 287 {
 288         int ret = 0;
 289
 290         /* Setup voltage control register */
 291         switch (pdata->sleep_vsel_id) {
 292         case FAN53555_VSEL_ID_0:
 293                 di->sleep_reg = FAN53555_VSEL0;
 294                 di->vol_reg = FAN53555_VSEL1;
 295                 break;
 296         case FAN53555_VSEL_ID_1:
 297                 di->sleep_reg = FAN53555_VSEL1;
 298                 di->vol_reg = FAN53555_VSEL0;
 299                 break;
 300         default:
 301                 dev_err(di->dev, "Invalid VSEL ID!\n");
 302                 return -EINVAL;
 303         }
 304
 305         switch (di->vendor) {
 306         case FAN53555_VENDOR_FAIRCHILD:
 307                 ret = fan53555_voltages_setup_fairchild(di);
 308                 break;
 309         case FAN53555_VENDOR_SILERGY:
 310                 ret = fan53555_voltages_setup_silergy(di);
 311                 break;
 312         default:
 313                 dev_err(di->dev, "vendor %d not supported!\n", di->vendor);
 314                 return -EINVAL;
 315         }
 316
 317         return ret;
 318 }
 319
 320 static int fan53555_regulator_register(struct fan53555_device_info *di,
 321                         struct regulator_config *config)
 322 {
 323         struct regulator_desc *rdesc = &di->desc;
 324
 325         rdesc->name = "fan53555-reg";
 326         rdesc->supply_name = "vin";
 327         rdesc->ops = &fan53555_regulator_ops;
 328         rdesc->type = REGULATOR_VOLTAGE;
 329         rdesc->n_voltages = FAN53555_NVOLTAGES;
 330         rdesc->enable_reg = di->vol_reg;
 331         rdesc->enable_mask = VSEL_BUCK_EN;
 332         rdesc->min_uV = di->vsel_min;
 333         rdesc->uV_step = di->vsel_step;
 334         rdesc->vsel_reg = di->vol_reg;
 335         rdesc->vsel_mask = VSEL_NSEL_MASK;
 336         rdesc->owner = THIS_MODULE;
 337
 338         di->rdev = devm_regulator_register(di->dev, &di->desc, config);
 339         return PTR_ERR_OR_ZERO(di->rdev);
 340 }
 341
 342 static const struct regmap_config fan53555_regmap_config = {
 343         .reg_bits = 8,
 344         .val_bits = 8,
 345 };
 346
 347 static struct fan53555_platform_data *fan53555_parse_dt(struct device *dev,
 348                                               struct device_node *np,
 349                                               const struct regulator_desc *desc)
 350 {
 351         struct fan53555_platform_data *pdata;
 352         int ret;
 353         u32 tmp;
 354
 355         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 356         if (!pdata)
 357                 return NULL;
 358
 359         pdata->regulator = of_get_regulator_init_data(dev, np, desc);
 360
 361         ret = of_property_read_u32(np, "fcs,suspend-voltage-selector",
 362                                    &tmp);
 363         if (!ret)
 364                 pdata->sleep_vsel_id = tmp;
 365
 366         return pdata;
 367 }
 368
 369 static const struct of_device_id fan53555_dt_ids[] = {
 370         {
 371                 .compatible = "fcs,fan53555",
 372                 .data = (void *)FAN53555_VENDOR_FAIRCHILD
 373         }, {
 374                 .compatible = "silergy,syr827",
 375                 .data = (void *)FAN53555_VENDOR_SILERGY,
 376         }, {
 377                 .compatible = "silergy,syr828",
 378                 .data = (void *)FAN53555_VENDOR_SILERGY,
 379         },
 380         { }
 381 };
 382 MODULE_DEVICE_TABLE(of, fan53555_dt_ids);
 383
 384 static int fan53555_regulator_probe(struct i2c_client *client,
 385                                 const struct i2c_device_id *id)
 386 {
 387         struct device_node *np = client->dev.of_node;
 388         struct fan53555_device_info *di;
 389         struct fan53555_platform_data *pdata;
 390         struct regulator_config config = { };
 391         unsigned int val;
 392         int ret;
 393
 394         di = devm_kzalloc(&client->dev, sizeof(struct fan53555_device_info),
 395                                         GFP_KERNEL);
 396         if (!di)
 397                 return -ENOMEM;
 398
 399         pdata = dev_get_platdata(&client->dev);
 400         if (!pdata)
 401                 pdata = fan53555_parse_dt(&client->dev, np, &di->desc);
 402
 403         if (!pdata || !pdata->regulator) {
 404                 dev_err(&client->dev, "Platform data not found!\n");
 405                 return -ENODEV;
 406         }
 407
 408         di->regulator = pdata->regulator;
 409         if (client->dev.of_node) {
 410                 const struct of_device_id *match;
 411
 412                 match = of_match_device(of_match_ptr(fan53555_dt_ids),
 413                                         &client->dev);
 414                 if (!match)
 415                         return -ENODEV;
 416
 417                 di->vendor = (unsigned long) match->data;
 418         } else {
 419                 /* if no ramp constraint set, get the pdata ramp_delay */
 420                 if (!di->regulator->constraints.ramp_delay) {
 421                         int slew_idx = (pdata->slew_rate & 0x7)
 422                                                 ? pdata->slew_rate : 0;
 423
 424                         di->regulator->constraints.ramp_delay
 425                                                 = slew_rates[slew_idx];
 426                 }
 427
 428                 di->vendor = id->driver_data;
 429         }
 430
 431         di->regmap = devm_regmap_init_i2c(client, &fan53555_regmap_config);
 432         if (IS_ERR(di->regmap)) {
 433                 dev_err(&client->dev, "Failed to allocate regmap!\n");
 434                 return PTR_ERR(di->regmap);
 435         }
 436         di->dev = &client->dev;
 437         i2c_set_clientdata(client, di);
 438         /* Get chip ID */
 439         ret = regmap_read(di->regmap, FAN53555_ID1, &val);
 440         if (ret < 0) {
 441                 dev_err(&client->dev, "Failed to get chip ID!\n");
 442                 return ret;
 443         }
 444         di->chip_id = val & DIE_ID;
 445         /* Get chip revision */
 446         ret = regmap_read(di->regmap, FAN53555_ID2, &val);
 447         if (ret < 0) {
 448                 dev_err(&client->dev, "Failed to get chip Rev!\n");
 449                 return ret;
 450         }
 451         di->chip_rev = val & DIE_REV;
 452         dev_info(&client->dev, "FAN53555 Option[%d] Rev[%d] Detected!\n",
 453                                 di->chip_id, di->chip_rev);
 454         /* Device init */
 455         ret = fan53555_device_setup(di, pdata);
 456         if (ret < 0) {
 457                 dev_err(&client->dev, "Failed to setup device!\n");
 458                 return ret;
 459         }
 460         /* Register regulator */
 461         config.dev = di->dev;
 462         config.init_data = di->regulator;
 463         config.regmap = di->regmap;
 464         config.driver_data = di;
 465         config.of_node = np;
 466
 467         ret = fan53555_regulator_register(di, &config);
 468         if (ret < 0)
 469                 dev_err(&client->dev, "Failed to register regulator!\n");
 470         return ret;
 471
 472 }
 473
 474 static const struct i2c_device_id fan53555_id[] = {
 475         {
 476                 .name = "fan53555",
 477                 .driver_data = FAN53555_VENDOR_FAIRCHILD
 478         }, {
 479                 .name = "syr82x",
 480                 .driver_data = FAN53555_VENDOR_SILERGY
 481         },
 482         { },
 483 };
 484 MODULE_DEVICE_TABLE(i2c, fan53555_id);
 485
 486 static struct i2c_driver fan53555_regulator_driver = {
 487         .driver = {
 488                 .name = "fan53555-regulator",
 489                 .of_match_table = of_match_ptr(fan53555_dt_ids),
 490         },
 491         .probe = fan53555_regulator_probe,
 492         .id_table = fan53555_id,
 493 };
 494
 495 module_i2c_driver(fan53555_regulator_driver);
 496
 497 MODULE_AUTHOR("Yunfan Zhang <yfzhang@marvell.com>");
 498 MODULE_DESCRIPTION("FAN53555 regulator driver");
 499 MODULE_LICENSE("GPL v2");