drivers/regulator/pfuze100-regulator.c

   1 /*
   2  * Copyright (C) 2011-2013 Freescale Semiconductor, Inc. All Rights Reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  17  */
  18 #include <linux/kernel.h>
  19 #include <linux/module.h>
  20 #include <linux/init.h>
  21 #include <linux/err.h>
  22 #include <linux/of.h>
  23 #include <linux/of_device.h>
  24 #include <linux/regulator/of_regulator.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/regulator/driver.h>
  27 #include <linux/regulator/machine.h>
  28 #include <linux/regulator/pfuze100.h>
  29 #include <linux/i2c.h>
  30 #include <linux/slab.h>
  31 #include <linux/regmap.h>
  32
  33 #define PFUZE_NUMREGS           128
  34 #define PFUZE100_VOL_OFFSET     0
  35 #define PFUZE100_STANDBY_OFFSET 1
  36 #define PFUZE100_MODE_OFFSET    3
  37 #define PFUZE100_CONF_OFFSET    4
  38
  39 #define PFUZE100_DEVICEID       0x0
  40 #define PFUZE100_REVID          0x3
  41 #define PFUZE100_FABID          0x4
  42
  43 #define PFUZE100_SW1ABVOL       0x20
  44 #define PFUZE100_SW1CVOL        0x2e
  45 #define PFUZE100_SW2VOL         0x35
  46 #define PFUZE100_SW3AVOL        0x3c
  47 #define PFUZE100_SW3BVOL        0x43
  48 #define PFUZE100_SW4VOL         0x4a
  49 #define PFUZE100_SWBSTCON1      0x66
  50 #define PFUZE100_VREFDDRCON     0x6a
  51 #define PFUZE100_VSNVSVOL       0x6b
  52 #define PFUZE100_VGEN1VOL       0x6c
  53 #define PFUZE100_VGEN2VOL       0x6d
  54 #define PFUZE100_VGEN3VOL       0x6e
  55 #define PFUZE100_VGEN4VOL       0x6f
  56 #define PFUZE100_VGEN5VOL       0x70
  57 #define PFUZE100_VGEN6VOL       0x71
  58
  59 struct pfuze_regulator {
  60         struct regulator_desc desc;
  61         unsigned char stby_reg;
  62         unsigned char stby_mask;
  63 };
  64
  65 struct pfuze_chip {
  66         struct regmap *regmap;
  67         struct device *dev;
  68         struct pfuze_regulator regulator_descs[PFUZE100_MAX_REGULATOR];
  69         struct regulator_dev *regulators[PFUZE100_MAX_REGULATOR];
  70 };
  71
  72 static const int pfuze100_swbst[] = {
  73         5000000, 5050000, 5100000, 5150000,
  74 };
  75
  76 static const int pfuze100_vsnvs[] = {
  77         1000000, 1100000, 1200000, 1300000, 1500000, 1800000, 3000000,
  78 };
  79
  80 static const struct i2c_device_id pfuze_device_id[] = {
  81         {.name = "pfuze100"},
  82         {},
  83 };
  84 MODULE_DEVICE_TABLE(i2c, pfuze_device_id);
  85
  86 static const struct of_device_id pfuze_dt_ids[] = {
  87         { .compatible = "fsl,pfuze100" },
  88         {},
  89 };
  90 MODULE_DEVICE_TABLE(of, pfuze_dt_ids);
  91
  92 static int pfuze100_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
  93 {
  94         struct pfuze_chip *pfuze100 = rdev_get_drvdata(rdev);
  95         int id = rdev->desc->id;
  96         unsigned int ramp_bits;
  97         int ret;
  98
  99         if (id < PFUZE100_SWBST) {
 100                 ramp_delay = 12500 / ramp_delay;
 101                 ramp_bits = (ramp_delay >> 1) - (ramp_delay >> 3);
 102                 ret = regmap_update_bits(pfuze100->regmap,
 103                                          rdev->desc->vsel_reg + 4,
 104                                          0xc0, ramp_bits << 6);
 105                 if (ret < 0)
 106                         dev_err(pfuze100->dev, "ramp failed, err %d\n", ret);
 107         } else
 108                 ret = -EACCES;
 109
 110         return ret;
 111 }
 112
 113 static struct regulator_ops pfuze100_ldo_regulator_ops = {
 114         .enable = regulator_enable_regmap,
 115         .disable = regulator_disable_regmap,
 116         .is_enabled = regulator_is_enabled_regmap,
 117         .list_voltage = regulator_list_voltage_linear,
 118         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 119         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 120 };
 121
 122 static struct regulator_ops pfuze100_fixed_regulator_ops = {
 123         .list_voltage = regulator_list_voltage_linear,
 124 };
 125
 126 static struct regulator_ops pfuze100_sw_regulator_ops = {
 127         .list_voltage = regulator_list_voltage_linear,
 128         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 129         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 130         .set_voltage_time_sel = regulator_set_voltage_time_sel,
 131         .set_ramp_delay = pfuze100_set_ramp_delay,
 132 };
 133
 134 static struct regulator_ops pfuze100_swb_regulator_ops = {
 135         .list_voltage = regulator_list_voltage_table,
 136         .map_voltage = regulator_map_voltage_ascend,
 137         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 138         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 139
 140 };
 141
 142 #define PFUZE100_FIXED_REG(_name, base, voltage)        \
 143         [PFUZE100_ ## _name] = {        \
 144                 .desc = {       \
 145                         .name = #_name, \
 146                         .n_voltages = 1,        \
 147                         .ops = &pfuze100_fixed_regulator_ops,   \
 148                         .type = REGULATOR_VOLTAGE,      \
 149                         .id = PFUZE100_ ## _name,       \
 150                         .owner = THIS_MODULE,   \
 151                         .min_uV = (voltage),    \
 152                         .enable_reg = (base),   \
 153                         .enable_mask = 0x10,    \
 154                 },      \
 155         }
 156
 157 #define PFUZE100_SW_REG(_name, base, min, max, step)    \
 158         [PFUZE100_ ## _name] = {        \
 159                 .desc = {       \
 160                         .name = #_name,\
 161                         .n_voltages = ((max) - (min)) / (step) + 1,     \
 162                         .ops = &pfuze100_sw_regulator_ops,      \
 163                         .type = REGULATOR_VOLTAGE,      \
 164                         .id = PFUZE100_ ## _name,       \
 165                         .owner = THIS_MODULE,   \
 166                         .min_uV = (min),        \
 167                         .uV_step = (step),      \
 168                         .vsel_reg = (base) + PFUZE100_VOL_OFFSET,       \
 169                         .vsel_mask = 0x3f,      \
 170                 },      \
 171                 .stby_reg = (base) + PFUZE100_STANDBY_OFFSET,   \
 172                 .stby_mask = 0x3f,      \
 173         }
 174
 175 #define PFUZE100_SWB_REG(_name, base, mask, voltages)   \
 176         [PFUZE100_ ## _name] = {        \
 177                 .desc = {       \
 178                         .name = #_name, \
 179                         .n_voltages = ARRAY_SIZE(voltages),     \
 180                         .ops = &pfuze100_swb_regulator_ops,     \
 181                         .type = REGULATOR_VOLTAGE,      \
 182                         .id = PFUZE100_ ## _name,       \
 183                         .owner = THIS_MODULE,   \
 184                         .volt_table = voltages, \
 185                         .vsel_reg = (base),     \
 186                         .vsel_mask = (mask),    \
 187                 },      \
 188         }
 189
 190 #define PFUZE100_VGEN_REG(_name, base, min, max, step)  \
 191         [PFUZE100_ ## _name] = {        \
 192                 .desc = {       \
 193                         .name = #_name, \
 194                         .n_voltages = ((max) - (min)) / (step) + 1,     \
 195                         .ops = &pfuze100_ldo_regulator_ops,     \
 196                         .type = REGULATOR_VOLTAGE,      \
 197                         .id = PFUZE100_ ## _name,       \
 198                         .owner = THIS_MODULE,   \
 199                         .min_uV = (min),        \
 200                         .uV_step = (step),      \
 201                         .vsel_reg = (base),     \
 202                         .vsel_mask = 0xf,       \
 203                         .enable_reg = (base),   \
 204                         .enable_mask = 0x10,    \
 205                 },      \
 206                 .stby_reg = (base),     \
 207                 .stby_mask = 0x20,      \
 208         }
 209
 210 static struct pfuze_regulator pfuze100_regulators[] = {
 211         PFUZE100_SW_REG(SW1AB, PFUZE100_SW1ABVOL, 300000, 1875000, 25000),
 212         PFUZE100_SW_REG(SW1C, PFUZE100_SW1CVOL, 300000, 1875000, 25000),
 213         PFUZE100_SW_REG(SW2, PFUZE100_SW2VOL, 400000, 1975000, 25000),
 214         PFUZE100_SW_REG(SW3A, PFUZE100_SW3AVOL, 400000, 1975000, 25000),
 215         PFUZE100_SW_REG(SW3B, PFUZE100_SW3BVOL, 400000, 1975000, 25000),
 216         PFUZE100_SW_REG(SW4, PFUZE100_SW4VOL, 400000, 1975000, 25000),
 217         PFUZE100_SWB_REG(SWBST, PFUZE100_SWBSTCON1, 0x3 , pfuze100_swbst),
 218         PFUZE100_SWB_REG(VSNVS, PFUZE100_VSNVSVOL, 0x7, pfuze100_vsnvs),
 219         PFUZE100_FIXED_REG(VREFDDR, PFUZE100_VREFDDRCON, 750000),
 220         PFUZE100_VGEN_REG(VGEN1, PFUZE100_VGEN1VOL, 800000, 1550000, 50000),
 221         PFUZE100_VGEN_REG(VGEN2, PFUZE100_VGEN2VOL, 800000, 1550000, 50000),
 222         PFUZE100_VGEN_REG(VGEN3, PFUZE100_VGEN3VOL, 1800000, 3300000, 100000),
 223         PFUZE100_VGEN_REG(VGEN4, PFUZE100_VGEN4VOL, 1800000, 3300000, 100000),
 224         PFUZE100_VGEN_REG(VGEN5, PFUZE100_VGEN5VOL, 1800000, 3300000, 100000),
 225         PFUZE100_VGEN_REG(VGEN6, PFUZE100_VGEN6VOL, 1800000, 3300000, 100000),
 226 };
 227
 228 #ifdef CONFIG_OF
 229 static struct of_regulator_match pfuze100_matches[] = {
 230         { .name = "sw1ab",      },
 231         { .name = "sw1c",       },
 232         { .name = "sw2",        },
 233         { .name = "sw3a",       },
 234         { .name = "sw3b",       },
 235         { .name = "sw4",        },
 236         { .name = "swbst",      },
 237         { .name = "vsnvs",      },
 238         { .name = "vrefddr",    },
 239         { .name = "vgen1",      },
 240         { .name = "vgen2",      },
 241         { .name = "vgen3",      },
 242         { .name = "vgen4",      },
 243         { .name = "vgen5",      },
 244         { .name = "vgen6",      },
 245 };
 246
 247 static int pfuze_parse_regulators_dt(struct pfuze_chip *chip)
 248 {
 249         struct device *dev = chip->dev;
 250         struct device_node *np, *parent;
 251         int ret;
 252
 253         np = of_node_get(dev->parent->of_node);
 254         if (!np)
 255                 return 0;
 256
 257         parent = of_find_node_by_name(np, "regulators");
 258         if (!parent) {
 259                 dev_err(dev, "regulators node not found\n");
 260                 return -EINVAL;
 261         }
 262
 263         ret = of_regulator_match(dev, parent, pfuze100_matches,
 264                                  ARRAY_SIZE(pfuze100_matches));
 265
 266         of_node_put(parent);
 267         if (ret < 0) {
 268                 dev_err(dev, "Error parsing regulator init data: %d\n",
 269                         ret);
 270                 return ret;
 271         }
 272
 273         return 0;
 274 }
 275
 276 static inline struct regulator_init_data *match_init_data(int index)
 277 {
 278         return pfuze100_matches[index].init_data;
 279 }
 280
 281 static inline struct device_node *match_of_node(int index)
 282 {
 283         return pfuze100_matches[index].of_node;
 284 }
 285 #else
 286 static int pfuze_parse_regulators_dt(struct pfuze_chip *chip)
 287 {
 288         return 0;
 289 }
 290
 291 static inline struct regulator_init_data *match_init_data(int index)
 292 {
 293         return NULL;
 294 }
 295
 296 static inline struct device_node *match_of_node(int index)
 297 {
 298         return NULL;
 299 }
 300 #endif
 301
 302 static int pfuze_identify(struct pfuze_chip *pfuze_chip)
 303 {
 304         unsigned int value;
 305         int ret;
 306
 307         ret = regmap_read(pfuze_chip->regmap, PFUZE100_DEVICEID, &value);
 308         if (ret)
 309                 return ret;
 310
 311         switch (value & 0x0f) {
 312         /*
 313          * Freescale misprogrammed 1-3% of parts prior to week 8 of 2013
 314          * as ID=8
 315          */
 316         case 0x8:
 317                 dev_info(pfuze_chip->dev, "Assuming misprogrammed ID=0x8");
 318         case 0x0:
 319                 break;
 320         default:
 321                 dev_warn(pfuze_chip->dev, "Illegal ID: %x\n", value);
 322                 return -ENODEV;
 323         }
 324
 325         ret = regmap_read(pfuze_chip->regmap, PFUZE100_REVID, &value);
 326         if (ret)
 327                 return ret;
 328         dev_info(pfuze_chip->dev,
 329                  "Full layer: %x, Metal layer: %x\n",
 330                  (value & 0xf0) >> 4, value & 0x0f);
 331
 332         ret = regmap_read(pfuze_chip->regmap, PFUZE100_FABID, &value);
 333         if (ret)
 334                 return ret;
 335         dev_info(pfuze_chip->dev, "FAB: %x, FIN: %x\n",
 336                  (value & 0xc) >> 2, value & 0x3);
 337
 338         return 0;
 339 }
 340
 341 static const struct regmap_config pfuze_regmap_config = {
 342         .reg_bits = 8,
 343         .val_bits = 8,
 344         .max_register = PFUZE_NUMREGS - 1,
 345         .cache_type = REGCACHE_RBTREE,
 346 };
 347
 348 static int pfuze100_regulator_probe(struct i2c_client *client,
 349                                     const struct i2c_device_id *id)
 350 {
 351         struct pfuze_chip *pfuze_chip;
 352         struct pfuze_regulator_platform_data *pdata =
 353             dev_get_platdata(&client->dev);
 354         struct regulator_config config = { };
 355         int i, ret;
 356
 357         pfuze_chip = devm_kzalloc(&client->dev, sizeof(*pfuze_chip),
 358                         GFP_KERNEL);
 359         if (!pfuze_chip)
 360                 return -ENOMEM;
 361
 362         i2c_set_clientdata(client, pfuze_chip);
 363
 364         memcpy(pfuze_chip->regulator_descs, pfuze100_regulators,
 365                 sizeof(pfuze_chip->regulator_descs));
 366
 367         pfuze_chip->dev = &client->dev;
 368
 369         pfuze_chip->regmap = devm_regmap_init_i2c(client, &pfuze_regmap_config);
 370         if (IS_ERR(pfuze_chip->regmap)) {
 371                 ret = PTR_ERR(pfuze_chip->regmap);
 372                 dev_err(&client->dev,
 373                         "regmap allocation failed with err %d\n", ret);
 374                 return ret;
 375         }
 376
 377         ret = pfuze_identify(pfuze_chip);
 378         if (ret) {
 379                 dev_err(&client->dev, "unrecognized pfuze chip ID!\n");
 380                 return ret;
 381         }
 382
 383         ret = pfuze_parse_regulators_dt(pfuze_chip);
 384         if (ret)
 385                 return ret;
 386
 387         for (i = 0; i < PFUZE100_MAX_REGULATOR; i++) {
 388                 struct regulator_init_data *init_data;
 389                 struct regulator_desc *desc;
 390                 int val;
 391
 392                 desc = &pfuze_chip->regulator_descs[i].desc;
 393
 394                 if (pdata)
 395                         init_data = pdata->init_data[i];
 396                 else
 397                         init_data = match_init_data(i);
 398
 399                 /* SW2~SW4 high bit check and modify the voltage value table */
 400                 if (i > PFUZE100_SW1C && i < PFUZE100_SWBST) {
 401                         regmap_read(pfuze_chip->regmap, desc->vsel_reg, &val);
 402                         if (val & 0x40) {
 403                                 desc->min_uV = 800000;
 404                                 desc->uV_step = 50000;
 405                                 desc->n_voltages = 51;
 406                         }
 407                 }
 408
 409                 config.dev = &client->dev;
 410                 config.init_data = init_data;
 411                 config.driver_data = pfuze_chip;
 412                 config.of_node = match_of_node(i);
 413
 414                 pfuze_chip->regulators[i] =
 415                         devm_regulator_register(&client->dev, desc, &config);
 416                 if (IS_ERR(pfuze_chip->regulators[i])) {
 417                         dev_err(&client->dev, "register regulator%s failed\n",
 418                                 pfuze100_regulators[i].desc.name);
 419                         return PTR_ERR(pfuze_chip->regulators[i]);
 420                 }
 421         }
 422
 423         return 0;
 424 }
 425
 426 static struct i2c_driver pfuze_driver = {
 427         .id_table = pfuze_device_id,
 428         .driver = {
 429                 .name = "pfuze100-regulator",
 430                 .owner = THIS_MODULE,
 431                 .of_match_table = pfuze_dt_ids,
 432         },
 433         .probe = pfuze100_regulator_probe,
 434 };
 435 module_i2c_driver(pfuze_driver);
 436
 437 MODULE_AUTHOR("Robin Gong <b38343@freescale.com>");
 438 MODULE_DESCRIPTION("Regulator Driver for Freescale PFUZE100 PMIC");
 439 MODULE_LICENSE("GPL v2");
 440 MODULE_ALIAS("i2c:pfuze100-regulator");