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 };
  69
  70 enum {
  71         SILERGY_SYR82X = 8,
  72 };
  73
  74 struct fan53555_device_info {
  75         enum fan53555_vendor vendor;
  76         struct regmap *regmap;
  77         struct device *dev;
  78         struct regulator_desc desc;
  79         struct regulator_dev *rdev;
  80         struct regulator_init_data *regulator;
  81         /* IC Type and Rev */
  82         int chip_id;
  83         int chip_rev;
  84         /* Voltage setting register */
  85         unsigned int vol_reg;
  86         unsigned int sleep_reg;
  87         /* Voltage range and step(linear) */
  88         unsigned int vsel_min;
  89         unsigned int vsel_step;
  90         /* Voltage slew rate limiting */
  91         unsigned int slew_rate;
  92         /* Sleep voltage cache */
  93         unsigned int sleep_vol_cache;
  94 };
  95
  96 static int fan53555_set_suspend_voltage(struct regulator_dev *rdev, int uV)
  97 {
  98         struct fan53555_device_info *di = rdev_get_drvdata(rdev);
  99         int ret;
 100
 101         if (di->sleep_vol_cache == uV)
 102                 return 0;
 103         ret = regulator_map_voltage_linear(rdev, uV, uV);
 104         if (ret < 0)
 105                 return ret;
 106         ret = regmap_update_bits(di->regmap, di->sleep_reg,
 107                                         VSEL_NSEL_MASK, ret);
 108         if (ret < 0)
 109                 return ret;
 110         /* Cache the sleep voltage setting.
 111          * Might not be the real voltage which is rounded */
 112         di->sleep_vol_cache = uV;
 113
 114         return 0;
 115 }
 116
 117 static int fan53555_set_suspend_enable(struct regulator_dev *rdev)
 118 {
 119         struct fan53555_device_info *di = rdev_get_drvdata(rdev);
 120
 121         return regmap_update_bits(di->regmap, di->sleep_reg,
 122                                   VSEL_BUCK_EN, VSEL_BUCK_EN);
 123 }
 124
 125 static int fan53555_set_suspend_disable(struct regulator_dev *rdev)
 126 {
 127         struct fan53555_device_info *di = rdev_get_drvdata(rdev);
 128
 129         return regmap_update_bits(di->regmap, di->sleep_reg,
 130                                   VSEL_BUCK_EN, 0);
 131 }
 132
 133 static int fan53555_set_mode(struct regulator_dev *rdev, unsigned int mode)
 134 {
 135         struct fan53555_device_info *di = rdev_get_drvdata(rdev);
 136
 137         switch (mode) {
 138         case REGULATOR_MODE_FAST:
 139                 regmap_update_bits(di->regmap, di->vol_reg,
 140                                 VSEL_MODE, VSEL_MODE);
 141                 break;
 142         case REGULATOR_MODE_NORMAL:
 143                 regmap_update_bits(di->regmap, di->vol_reg, VSEL_MODE, 0);
 144                 break;
 145         default:
 146                 return -EINVAL;
 147         }
 148         return 0;
 149 }
 150
 151 static unsigned int fan53555_get_mode(struct regulator_dev *rdev)
 152 {
 153         struct fan53555_device_info *di = rdev_get_drvdata(rdev);
 154         unsigned int val;
 155         int ret = 0;
 156
 157         ret = regmap_read(di->regmap, di->vol_reg, &val);
 158         if (ret < 0)
 159                 return ret;
 160         if (val & VSEL_MODE)
 161                 return REGULATOR_MODE_FAST;
 162         else
 163                 return REGULATOR_MODE_NORMAL;
 164 }
 165
 166 static const int slew_rates[] = {
 167         64000,
 168         32000,
 169         16000,
 170          8000,
 171          4000,
 172          2000,
 173          1000,
 174           500,
 175 };
 176
 177 static int fan53555_set_ramp(struct regulator_dev *rdev, int ramp)
 178 {
 179         struct fan53555_device_info *di = rdev_get_drvdata(rdev);
 180         int regval = -1, i;
 181
 182         for (i = 0; i < ARRAY_SIZE(slew_rates); i++) {
 183                 if (ramp <= slew_rates[i])
 184                         regval = i;
 185                 else
 186                         break;
 187         }
 188
 189         if (regval < 0) {
 190                 dev_err(di->dev, "unsupported ramp value %d\n", ramp);
 191                 return -EINVAL;
 192         }
 193
 194         return regmap_update_bits(di->regmap, FAN53555_CONTROL,
 195                                   CTL_SLEW_MASK, regval << CTL_SLEW_SHIFT);
 196 }
 197
 198 static struct regulator_ops fan53555_regulator_ops = {
 199         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 200         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 201         .set_voltage_time_sel = regulator_set_voltage_time_sel,
 202         .map_voltage = regulator_map_voltage_linear,
 203         .list_voltage = regulator_list_voltage_linear,
 204         .set_suspend_voltage = fan53555_set_suspend_voltage,
 205         .enable = regulator_enable_regmap,
 206         .disable = regulator_disable_regmap,
 207         .is_enabled = regulator_is_enabled_regmap,
 208         .set_mode = fan53555_set_mode,
 209         .get_mode = fan53555_get_mode,
 210         .set_ramp_delay = fan53555_set_ramp,
 211         .set_suspend_enable = fan53555_set_suspend_enable,
 212         .set_suspend_disable = fan53555_set_suspend_disable,
 213 };
 214
 215 static int fan53555_voltages_setup_fairchild(struct fan53555_device_info *di)
 216 {
 217         /* Init voltage range and step */
 218         switch (di->chip_id) {
 219         case FAN53555_CHIP_ID_00:
 220         case FAN53555_CHIP_ID_01:
 221         case FAN53555_CHIP_ID_03:
 222         case FAN53555_CHIP_ID_05:
 223                 di->vsel_min = 600000;
 224                 di->vsel_step = 10000;
 225                 break;
 226         case FAN53555_CHIP_ID_04:
 227                 di->vsel_min = 603000;
 228                 di->vsel_step = 12826;
 229                 break;
 230         default:
 231                 dev_err(di->dev,
 232                         "Chip ID %d not supported!\n", di->chip_id);
 233                 return -EINVAL;
 234         }
 235
 236         return 0;
 237 }
 238
 239 static int fan53555_voltages_setup_silergy(struct fan53555_device_info *di)
 240 {
 241         /* Init voltage range and step */
 242         switch (di->chip_id) {
 243         case SILERGY_SYR82X:
 244                 di->vsel_min = 712500;
 245                 di->vsel_step = 12500;
 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         return 0;
 254 }
 255
 256 /* For 00,01,03,05 options:
 257  * VOUT = 0.60V + NSELx * 10mV, from 0.60 to 1.23V.
 258  * For 04 option:
 259  * VOUT = 0.603V + NSELx * 12.826mV, from 0.603 to 1.411V.
 260  * */
 261 static int fan53555_device_setup(struct fan53555_device_info *di,
 262                                 struct fan53555_platform_data *pdata)
 263 {
 264         int ret = 0;
 265
 266         /* Setup voltage control register */
 267         switch (pdata->sleep_vsel_id) {
 268         case FAN53555_VSEL_ID_0:
 269                 di->sleep_reg = FAN53555_VSEL0;
 270                 di->vol_reg = FAN53555_VSEL1;
 271                 break;
 272         case FAN53555_VSEL_ID_1:
 273                 di->sleep_reg = FAN53555_VSEL1;
 274                 di->vol_reg = FAN53555_VSEL0;
 275                 break;
 276         default:
 277                 dev_err(di->dev, "Invalid VSEL ID!\n");
 278                 return -EINVAL;
 279         }
 280
 281         switch (di->vendor) {
 282         case FAN53555_VENDOR_FAIRCHILD:
 283                 ret = fan53555_voltages_setup_fairchild(di);
 284                 break;
 285         case FAN53555_VENDOR_SILERGY:
 286                 ret = fan53555_voltages_setup_silergy(di);
 287                 break;
 288         default:
 289                 dev_err(di->dev, "vendor %d not supported!\n", di->vendor);
 290                 return -EINVAL;
 291         }
 292
 293         return ret;
 294 }
 295
 296 static int fan53555_regulator_register(struct fan53555_device_info *di,
 297                         struct regulator_config *config)
 298 {
 299         struct regulator_desc *rdesc = &di->desc;
 300
 301         rdesc->name = "fan53555-reg";
 302         rdesc->supply_name = "vin";
 303         rdesc->ops = &fan53555_regulator_ops;
 304         rdesc->type = REGULATOR_VOLTAGE;
 305         rdesc->n_voltages = FAN53555_NVOLTAGES;
 306         rdesc->enable_reg = di->vol_reg;
 307         rdesc->enable_mask = VSEL_BUCK_EN;
 308         rdesc->min_uV = di->vsel_min;
 309         rdesc->uV_step = di->vsel_step;
 310         rdesc->vsel_reg = di->vol_reg;
 311         rdesc->vsel_mask = VSEL_NSEL_MASK;
 312         rdesc->owner = THIS_MODULE;
 313
 314         di->rdev = devm_regulator_register(di->dev, &di->desc, config);
 315         return PTR_ERR_OR_ZERO(di->rdev);
 316 }
 317
 318 static const struct regmap_config fan53555_regmap_config = {
 319         .reg_bits = 8,
 320         .val_bits = 8,
 321 };
 322
 323 static struct fan53555_platform_data *fan53555_parse_dt(struct device *dev,
 324                                               struct device_node *np,
 325                                               const struct regulator_desc *desc)
 326 {
 327         struct fan53555_platform_data *pdata;
 328         int ret;
 329         u32 tmp;
 330
 331         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 332         if (!pdata)
 333                 return NULL;
 334
 335         pdata->regulator = of_get_regulator_init_data(dev, np, desc);
 336
 337         ret = of_property_read_u32(np, "fcs,suspend-voltage-selector",
 338                                    &tmp);
 339         if (!ret)
 340                 pdata->sleep_vsel_id = tmp;
 341
 342         return pdata;
 343 }
 344
 345 static const struct of_device_id fan53555_dt_ids[] = {
 346         {
 347                 .compatible = "fcs,fan53555",
 348                 .data = (void *)FAN53555_VENDOR_FAIRCHILD
 349         }, {
 350                 .compatible = "silergy,syr827",
 351                 .data = (void *)FAN53555_VENDOR_SILERGY,
 352         }, {
 353                 .compatible = "silergy,syr828",
 354                 .data = (void *)FAN53555_VENDOR_SILERGY,
 355         },
 356         { }
 357 };
 358 MODULE_DEVICE_TABLE(of, fan53555_dt_ids);
 359
 360 static int fan53555_regulator_probe(struct i2c_client *client,
 361                                 const struct i2c_device_id *id)
 362 {
 363         struct device_node *np = client->dev.of_node;
 364         struct fan53555_device_info *di;
 365         struct fan53555_platform_data *pdata;
 366         struct regulator_config config = { };
 367         unsigned int val;
 368         int ret;
 369
 370         di = devm_kzalloc(&client->dev, sizeof(struct fan53555_device_info),
 371                                         GFP_KERNEL);
 372         if (!di)
 373                 return -ENOMEM;
 374
 375         pdata = dev_get_platdata(&client->dev);
 376         if (!pdata)
 377                 pdata = fan53555_parse_dt(&client->dev, np, &di->desc);
 378
 379         if (!pdata || !pdata->regulator) {
 380                 dev_err(&client->dev, "Platform data not found!\n");
 381                 return -ENODEV;
 382         }
 383
 384         di->regulator = pdata->regulator;
 385         if (client->dev.of_node) {
 386                 const struct of_device_id *match;
 387
 388                 match = of_match_device(of_match_ptr(fan53555_dt_ids),
 389                                         &client->dev);
 390                 if (!match)
 391                         return -ENODEV;
 392
 393                 di->vendor = (unsigned long) match->data;
 394         } else {
 395                 /* if no ramp constraint set, get the pdata ramp_delay */
 396                 if (!di->regulator->constraints.ramp_delay) {
 397                         int slew_idx = (pdata->slew_rate & 0x7)
 398                                                 ? pdata->slew_rate : 0;
 399
 400                         di->regulator->constraints.ramp_delay
 401                                                 = slew_rates[slew_idx];
 402                 }
 403
 404                 di->vendor = id->driver_data;
 405         }
 406
 407         di->regmap = devm_regmap_init_i2c(client, &fan53555_regmap_config);
 408         if (IS_ERR(di->regmap)) {
 409                 dev_err(&client->dev, "Failed to allocate regmap!\n");
 410                 return PTR_ERR(di->regmap);
 411         }
 412         di->dev = &client->dev;
 413         i2c_set_clientdata(client, di);
 414         /* Get chip ID */
 415         ret = regmap_read(di->regmap, FAN53555_ID1, &val);
 416         if (ret < 0) {
 417                 dev_err(&client->dev, "Failed to get chip ID!\n");
 418                 return ret;
 419         }
 420         di->chip_id = val & DIE_ID;
 421         /* Get chip revision */
 422         ret = regmap_read(di->regmap, FAN53555_ID2, &val);
 423         if (ret < 0) {
 424                 dev_err(&client->dev, "Failed to get chip Rev!\n");
 425                 return ret;
 426         }
 427         di->chip_rev = val & DIE_REV;
 428         dev_info(&client->dev, "FAN53555 Option[%d] Rev[%d] Detected!\n",
 429                                 di->chip_id, di->chip_rev);
 430         /* Device init */
 431         ret = fan53555_device_setup(di, pdata);
 432         if (ret < 0) {
 433                 dev_err(&client->dev, "Failed to setup device!\n");
 434                 return ret;
 435         }
 436         /* Register regulator */
 437         config.dev = di->dev;
 438         config.init_data = di->regulator;
 439         config.regmap = di->regmap;
 440         config.driver_data = di;
 441         config.of_node = np;
 442
 443         ret = fan53555_regulator_register(di, &config);
 444         if (ret < 0)
 445                 dev_err(&client->dev, "Failed to register regulator!\n");
 446         return ret;
 447
 448 }
 449
 450 static const struct i2c_device_id fan53555_id[] = {
 451         {
 452                 .name = "fan53555",
 453                 .driver_data = FAN53555_VENDOR_FAIRCHILD
 454         }, {
 455                 .name = "syr82x",
 456                 .driver_data = FAN53555_VENDOR_SILERGY
 457         },
 458         { },
 459 };
 460 MODULE_DEVICE_TABLE(i2c, fan53555_id);
 461
 462 static struct i2c_driver fan53555_regulator_driver = {
 463         .driver = {
 464                 .name = "fan53555-regulator",
 465                 .of_match_table = of_match_ptr(fan53555_dt_ids),
 466         },
 467         .probe = fan53555_regulator_probe,
 468         .id_table = fan53555_id,
 469 };
 470
 471 module_i2c_driver(fan53555_regulator_driver);
 472
 473 MODULE_AUTHOR("Yunfan Zhang <yfzhang@marvell.com>");
 474 MODULE_DESCRIPTION("FAN53555 regulator driver");
 475 MODULE_LICENSE("GPL v2");