linux/drivers/regulator/pfuze100-regulator.c
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   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          0x3
  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
  59struct pfuze_regulator {
  60        struct regulator_desc desc;
  61        unsigned char stby_reg;
  62        unsigned char stby_mask;
  63};
  64
  65struct 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
  72static const int pfuze100_swbst[] = {
  73        5000000, 5050000, 5100000, 5150000,
  74};
  75
  76static const int pfuze100_vsnvs[] = {
  77        1000000, 1100000, 1200000, 1300000, 1500000, 1800000, 3000000,
  78};
  79
  80static const struct i2c_device_id pfuze_device_id[] = {
  81        {.name = "pfuze100"},
  82        {},
  83};
  84MODULE_DEVICE_TABLE(i2c, pfuze_device_id);
  85
  86static const struct of_device_id pfuze_dt_ids[] = {
  87        { .compatible = "fsl,pfuze100" },
  88        {},
  89};
  90MODULE_DEVICE_TABLE(of, pfuze_dt_ids);
  91
  92static 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
 113static 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
 122static struct regulator_ops pfuze100_fixed_regulator_ops = {
 123        .list_voltage = regulator_list_voltage_linear,
 124};
 125
 126static 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
 134static 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
 210static 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
 229static 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
 247static 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
 276static inline struct regulator_init_data *match_init_data(int index)
 277{
 278        return pfuze100_matches[index].init_data;
 279}
 280
 281static inline struct device_node *match_of_node(int index)
 282{
 283        return pfuze100_matches[index].of_node;
 284}
 285#else
 286static int pfuze_parse_regulators_dt(struct pfuze_chip *chip)
 287{
 288        return 0;
 289}
 290
 291static inline struct regulator_init_data *match_init_data(int index)
 292{
 293        return NULL;
 294}
 295
 296static inline struct device_node *match_of_node(int index)
 297{
 298        return NULL;
 299}
 300#endif
 301
 302static 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        if (value & 0x0f) {
 312                dev_warn(pfuze_chip->dev, "Illegal ID: %x\n", value);
 313                return -ENODEV;
 314        }
 315
 316        ret = regmap_read(pfuze_chip->regmap, PFUZE100_REVID, &value);
 317        if (ret)
 318                return ret;
 319        dev_info(pfuze_chip->dev,
 320                 "Full lay: %x, Metal lay: %x\n",
 321                 (value & 0xf0) >> 4, value & 0x0f);
 322
 323        ret = regmap_read(pfuze_chip->regmap, PFUZE100_FABID, &value);
 324        if (ret)
 325                return ret;
 326        dev_info(pfuze_chip->dev, "FAB: %x, FIN: %x\n",
 327                 (value & 0xc) >> 2, value & 0x3);
 328
 329        return 0;
 330}
 331
 332static const struct regmap_config pfuze_regmap_config = {
 333        .reg_bits = 8,
 334        .val_bits = 8,
 335        .max_register = PFUZE_NUMREGS - 1,
 336        .cache_type = REGCACHE_RBTREE,
 337};
 338
 339static int pfuze100_regulator_probe(struct i2c_client *client,
 340                                    const struct i2c_device_id *id)
 341{
 342        struct pfuze_chip *pfuze_chip;
 343        struct pfuze_regulator_platform_data *pdata =
 344            dev_get_platdata(&client->dev);
 345        struct regulator_config config = { };
 346        int i, ret;
 347
 348        pfuze_chip = devm_kzalloc(&client->dev, sizeof(*pfuze_chip),
 349                        GFP_KERNEL);
 350        if (!pfuze_chip)
 351                return -ENOMEM;
 352
 353        i2c_set_clientdata(client, pfuze_chip);
 354
 355        memcpy(pfuze_chip->regulator_descs, pfuze100_regulators,
 356                sizeof(pfuze_chip->regulator_descs));
 357
 358        pfuze_chip->dev = &client->dev;
 359
 360        pfuze_chip->regmap = devm_regmap_init_i2c(client, &pfuze_regmap_config);
 361        if (IS_ERR(pfuze_chip->regmap)) {
 362                ret = PTR_ERR(pfuze_chip->regmap);
 363                dev_err(&client->dev,
 364                        "regmap allocation failed with err %d\n", ret);
 365                return ret;
 366        }
 367
 368        ret = pfuze_identify(pfuze_chip);
 369        if (ret) {
 370                dev_err(&client->dev, "unrecognized pfuze chip ID!\n");
 371                return ret;
 372        }
 373
 374        ret = pfuze_parse_regulators_dt(pfuze_chip);
 375        if (ret)
 376                return ret;
 377
 378        for (i = 0; i < PFUZE100_MAX_REGULATOR; i++) {
 379                struct regulator_init_data *init_data;
 380                struct regulator_desc *desc;
 381                int val;
 382
 383                desc = &pfuze_chip->regulator_descs[i].desc;
 384
 385                if (pdata)
 386                        init_data = pdata->init_data[i];
 387                else
 388                        init_data = match_init_data(i);
 389
 390                /* SW2~SW4 high bit check and modify the voltage value table */
 391                if (i > PFUZE100_SW1C && i < PFUZE100_SWBST) {
 392                        regmap_read(pfuze_chip->regmap, desc->vsel_reg, &val);
 393                        if (val & 0x40) {
 394                                desc->min_uV = 800000;
 395                                desc->uV_step = 50000;
 396                                desc->n_voltages = 51;
 397                        }
 398                }
 399
 400                config.dev = &client->dev;
 401                config.init_data = init_data;
 402                config.driver_data = pfuze_chip;
 403                config.of_node = match_of_node(i);
 404
 405                pfuze_chip->regulators[i] = regulator_register(desc, &config);
 406                if (IS_ERR(pfuze_chip->regulators[i])) {
 407                        dev_err(&client->dev, "register regulator%s failed\n",
 408                                pfuze100_regulators[i].desc.name);
 409                        ret = PTR_ERR(pfuze_chip->regulators[i]);
 410                        while (--i >= 0)
 411                                regulator_unregister(pfuze_chip->regulators[i]);
 412                        return ret;
 413                }
 414        }
 415
 416        return 0;
 417}
 418
 419static int pfuze100_regulator_remove(struct i2c_client *client)
 420{
 421        int i;
 422        struct pfuze_chip *pfuze_chip = i2c_get_clientdata(client);
 423
 424        for (i = 0; i < PFUZE100_MAX_REGULATOR; i++)
 425                regulator_unregister(pfuze_chip->regulators[i]);
 426
 427        return 0;
 428}
 429
 430static struct i2c_driver pfuze_driver = {
 431        .id_table = pfuze_device_id,
 432        .driver = {
 433                .name = "pfuze100-regulator",
 434                .owner = THIS_MODULE,
 435                .of_match_table = pfuze_dt_ids,
 436        },
 437        .probe = pfuze100_regulator_probe,
 438        .remove = pfuze100_regulator_remove,
 439};
 440module_i2c_driver(pfuze_driver);
 441
 442MODULE_AUTHOR("Robin Gong <b38343@freescale.com>");
 443MODULE_DESCRIPTION("Regulator Driver for Freescale PFUZE100 PMIC");
 444MODULE_LICENSE("GPL v2");
 445MODULE_ALIAS("i2c:pfuze100-regulator");
 446
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