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_mode(struct regulator_dev *rdev, unsigned int mode)
 118 {
 119         struct fan53555_device_info *di = rdev_get_drvdata(rdev);
 120
 121         switch (mode) {
 122         case REGULATOR_MODE_FAST:
 123                 regmap_update_bits(di->regmap, di->vol_reg,
 124                                 VSEL_MODE, VSEL_MODE);
 125                 break;
 126         case REGULATOR_MODE_NORMAL:
 127                 regmap_update_bits(di->regmap, di->vol_reg, VSEL_MODE, 0);
 128                 break;
 129         default:
 130                 return -EINVAL;
 131         }
 132         return 0;
 133 }
 134
 135 static unsigned int fan53555_get_mode(struct regulator_dev *rdev)
 136 {
 137         struct fan53555_device_info *di = rdev_get_drvdata(rdev);
 138         unsigned int val;
 139         int ret = 0;
 140
 141         ret = regmap_read(di->regmap, di->vol_reg, &val);
 142         if (ret < 0)
 143                 return ret;
 144         if (val & VSEL_MODE)
 145                 return REGULATOR_MODE_FAST;
 146         else
 147                 return REGULATOR_MODE_NORMAL;
 148 }
 149
 150 static int slew_rates[] = {
 151         64000,
 152         32000,
 153         16000,
 154          8000,
 155          4000,
 156          2000,
 157          1000,
 158           500,
 159 };
 160
 161 static int fan53555_set_ramp(struct regulator_dev *rdev, int ramp)
 162 {
 163         struct fan53555_device_info *di = rdev_get_drvdata(rdev);
 164         int regval = -1, i;
 165
 166         for (i = 0; i < ARRAY_SIZE(slew_rates); i++) {
 167                 if (ramp <= slew_rates[i])
 168                         regval = i;
 169                 else
 170                         break;
 171         }
 172
 173         if (regval < 0) {
 174                 dev_err(di->dev, "unsupported ramp value %d\n", ramp);
 175                 return -EINVAL;
 176         }
 177
 178         return regmap_update_bits(di->regmap, FAN53555_CONTROL,
 179                                   CTL_SLEW_MASK, regval << CTL_SLEW_SHIFT);
 180 }
 181
 182 static struct regulator_ops fan53555_regulator_ops = {
 183         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 184         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 185         .map_voltage = regulator_map_voltage_linear,
 186         .list_voltage = regulator_list_voltage_linear,
 187         .set_suspend_voltage = fan53555_set_suspend_voltage,
 188         .enable = regulator_enable_regmap,
 189         .disable = regulator_disable_regmap,
 190         .is_enabled = regulator_is_enabled_regmap,
 191         .set_mode = fan53555_set_mode,
 192         .get_mode = fan53555_get_mode,
 193         .set_ramp_delay = fan53555_set_ramp,
 194 };
 195
 196 static int fan53555_voltages_setup_fairchild(struct fan53555_device_info *di)
 197 {
 198         /* Init voltage range and step */
 199         switch (di->chip_id) {
 200         case FAN53555_CHIP_ID_00:
 201         case FAN53555_CHIP_ID_01:
 202         case FAN53555_CHIP_ID_03:
 203         case FAN53555_CHIP_ID_05:
 204                 di->vsel_min = 600000;
 205                 di->vsel_step = 10000;
 206                 break;
 207         case FAN53555_CHIP_ID_04:
 208                 di->vsel_min = 603000;
 209                 di->vsel_step = 12826;
 210                 break;
 211         default:
 212                 dev_err(di->dev,
 213                         "Chip ID %d not supported!\n", di->chip_id);
 214                 return -EINVAL;
 215         }
 216
 217         return 0;
 218 }
 219
 220 static int fan53555_voltages_setup_silergy(struct fan53555_device_info *di)
 221 {
 222         /* Init voltage range and step */
 223         switch (di->chip_id) {
 224         case SILERGY_SYR82X:
 225                 di->vsel_min = 712500;
 226                 di->vsel_step = 12500;
 227                 break;
 228         default:
 229                 dev_err(di->dev,
 230                         "Chip ID %d not supported!\n", di->chip_id);
 231                 return -EINVAL;
 232         }
 233
 234         return 0;
 235 }
 236
 237 /* For 00,01,03,05 options:
 238  * VOUT = 0.60V + NSELx * 10mV, from 0.60 to 1.23V.
 239  * For 04 option:
 240  * VOUT = 0.603V + NSELx * 12.826mV, from 0.603 to 1.411V.
 241  * */
 242 static int fan53555_device_setup(struct fan53555_device_info *di,
 243                                 struct fan53555_platform_data *pdata)
 244 {
 245         int ret = 0;
 246
 247         /* Setup voltage control register */
 248         switch (pdata->sleep_vsel_id) {
 249         case FAN53555_VSEL_ID_0:
 250                 di->sleep_reg = FAN53555_VSEL0;
 251                 di->vol_reg = FAN53555_VSEL1;
 252                 break;
 253         case FAN53555_VSEL_ID_1:
 254                 di->sleep_reg = FAN53555_VSEL1;
 255                 di->vol_reg = FAN53555_VSEL0;
 256                 break;
 257         default:
 258                 dev_err(di->dev, "Invalid VSEL ID!\n");
 259                 return -EINVAL;
 260         }
 261
 262         switch (di->vendor) {
 263         case FAN53555_VENDOR_FAIRCHILD:
 264                 ret = fan53555_voltages_setup_fairchild(di);
 265                 break;
 266         case FAN53555_VENDOR_SILERGY:
 267                 ret = fan53555_voltages_setup_silergy(di);
 268                 break;
 269         default:
 270                 dev_err(di->dev, "vendor %d not supported!\n", di->vendor);
 271                 return -EINVAL;
 272         }
 273
 274         return ret;
 275 }
 276
 277 static int fan53555_regulator_register(struct fan53555_device_info *di,
 278                         struct regulator_config *config)
 279 {
 280         struct regulator_desc *rdesc = &di->desc;
 281
 282         rdesc->name = "fan53555-reg";
 283         rdesc->supply_name = "vin";
 284         rdesc->ops = &fan53555_regulator_ops;
 285         rdesc->type = REGULATOR_VOLTAGE;
 286         rdesc->n_voltages = FAN53555_NVOLTAGES;
 287         rdesc->enable_reg = di->vol_reg;
 288         rdesc->enable_mask = VSEL_BUCK_EN;
 289         rdesc->min_uV = di->vsel_min;
 290         rdesc->uV_step = di->vsel_step;
 291         rdesc->vsel_reg = di->vol_reg;
 292         rdesc->vsel_mask = VSEL_NSEL_MASK;
 293         rdesc->owner = THIS_MODULE;
 294
 295         di->rdev = devm_regulator_register(di->dev, &di->desc, config);
 296         return PTR_ERR_OR_ZERO(di->rdev);
 297 }
 298
 299 static struct regmap_config fan53555_regmap_config = {
 300         .reg_bits = 8,
 301         .val_bits = 8,
 302 };
 303
 304 static struct fan53555_platform_data *fan53555_parse_dt(struct device *dev,
 305                                                         struct device_node *np)
 306 {
 307         struct fan53555_platform_data *pdata;
 308         int ret;
 309         u32 tmp;
 310
 311         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 312         if (!pdata)
 313                 return NULL;
 314
 315         pdata->regulator = of_get_regulator_init_data(dev, np);
 316
 317         ret = of_property_read_u32(np, "fcs,suspend-voltage-selector",
 318                                    &tmp);
 319         if (!ret)
 320                 pdata->sleep_vsel_id = tmp;
 321
 322         return pdata;
 323 }
 324
 325 static const struct of_device_id fan53555_dt_ids[] = {
 326         {
 327                 .compatible = "fcs,fan53555",
 328                 .data = (void *)FAN53555_VENDOR_FAIRCHILD
 329         }, {
 330                 .compatible = "silergy,syr827",
 331                 .data = (void *)FAN53555_VENDOR_SILERGY,
 332         }, {
 333                 .compatible = "silergy,syr828",
 334                 .data = (void *)FAN53555_VENDOR_SILERGY,
 335         },
 336         { }
 337 };
 338 MODULE_DEVICE_TABLE(of, fan53555_dt_ids);
 339
 340 static int fan53555_regulator_probe(struct i2c_client *client,
 341                                 const struct i2c_device_id *id)
 342 {
 343         struct device_node *np = client->dev.of_node;
 344         struct fan53555_device_info *di;
 345         struct fan53555_platform_data *pdata;
 346         struct regulator_config config = { };
 347         unsigned int val;
 348         int ret;
 349
 350         pdata = dev_get_platdata(&client->dev);
 351         if (!pdata)
 352                 pdata = fan53555_parse_dt(&client->dev, np);
 353
 354         if (!pdata || !pdata->regulator) {
 355                 dev_err(&client->dev, "Platform data not found!\n");
 356                 return -ENODEV;
 357         }
 358
 359         di = devm_kzalloc(&client->dev, sizeof(struct fan53555_device_info),
 360                                         GFP_KERNEL);
 361         if (!di)
 362                 return -ENOMEM;
 363
 364         di->regulator = pdata->regulator;
 365         if (client->dev.of_node) {
 366                 const struct of_device_id *match;
 367
 368                 match = of_match_device(of_match_ptr(fan53555_dt_ids),
 369                                         &client->dev);
 370                 if (!match)
 371                         return -ENODEV;
 372
 373                 di->vendor = (unsigned long) match->data;
 374         } else {
 375                 /* if no ramp constraint set, get the pdata ramp_delay */
 376                 if (!di->regulator->constraints.ramp_delay) {
 377                         int slew_idx = (pdata->slew_rate & 0x7)
 378                                                 ? pdata->slew_rate : 0;
 379
 380                         di->regulator->constraints.ramp_delay
 381                                                 = slew_rates[slew_idx];
 382                 }
 383
 384                 di->vendor = id->driver_data;
 385         }
 386
 387         di->regmap = devm_regmap_init_i2c(client, &fan53555_regmap_config);
 388         if (IS_ERR(di->regmap)) {
 389                 dev_err(&client->dev, "Failed to allocate regmap!\n");
 390                 return PTR_ERR(di->regmap);
 391         }
 392         di->dev = &client->dev;
 393         i2c_set_clientdata(client, di);
 394         /* Get chip ID */
 395         ret = regmap_read(di->regmap, FAN53555_ID1, &val);
 396         if (ret < 0) {
 397                 dev_err(&client->dev, "Failed to get chip ID!\n");
 398                 return ret;
 399         }
 400         di->chip_id = val & DIE_ID;
 401         /* Get chip revision */
 402         ret = regmap_read(di->regmap, FAN53555_ID2, &val);
 403         if (ret < 0) {
 404                 dev_err(&client->dev, "Failed to get chip Rev!\n");
 405                 return ret;
 406         }
 407         di->chip_rev = val & DIE_REV;
 408         dev_info(&client->dev, "FAN53555 Option[%d] Rev[%d] Detected!\n",
 409                                 di->chip_id, di->chip_rev);
 410         /* Device init */
 411         ret = fan53555_device_setup(di, pdata);
 412         if (ret < 0) {
 413                 dev_err(&client->dev, "Failed to setup device!\n");
 414                 return ret;
 415         }
 416         /* Register regulator */
 417         config.dev = di->dev;
 418         config.init_data = di->regulator;
 419         config.regmap = di->regmap;
 420         config.driver_data = di;
 421         config.of_node = np;
 422
 423         ret = fan53555_regulator_register(di, &config);
 424         if (ret < 0)
 425                 dev_err(&client->dev, "Failed to register regulator!\n");
 426         return ret;
 427
 428 }
 429
 430 static const struct i2c_device_id fan53555_id[] = {
 431         {
 432                 .name = "fan53555",
 433                 .driver_data = FAN53555_VENDOR_FAIRCHILD
 434         }, {
 435                 .name = "syr82x",
 436                 .driver_data = FAN53555_VENDOR_SILERGY
 437         },
 438         { },
 439 };
 440
 441 static struct i2c_driver fan53555_regulator_driver = {
 442         .driver = {
 443                 .name = "fan53555-regulator",
 444                 .of_match_table = of_match_ptr(fan53555_dt_ids),
 445         },
 446         .probe = fan53555_regulator_probe,
 447         .id_table = fan53555_id,
 448 };
 449
 450 module_i2c_driver(fan53555_regulator_driver);
 451
 452 MODULE_AUTHOR("Yunfan Zhang <yfzhang@marvell.com>");
 453 MODULE_DESCRIPTION("FAN53555 regulator driver");
 454 MODULE_LICENSE("GPL v2");