linux/drivers/regulator/da9052-regulator.c
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   1/*
   2* da9052-regulator.c: Regulator driver for DA9052
   3*
   4* Copyright(c) 2011 Dialog Semiconductor Ltd.
   5*
   6* Author: David Dajun Chen <dchen@diasemi.com>
   7*
   8* This program is free software; you can redistribute it and/or modify
   9* it under the terms of the GNU General Public License as published by
  10* the Free Software Foundation; either version 2 of the License, or
  11* (at your option) any later version.
  12*
  13*/
  14
  15#include <linux/module.h>
  16#include <linux/moduleparam.h>
  17#include <linux/init.h>
  18#include <linux/err.h>
  19#include <linux/platform_device.h>
  20#include <linux/regulator/driver.h>
  21#include <linux/regulator/machine.h>
  22#ifdef CONFIG_OF
  23#include <linux/of.h>
  24#include <linux/regulator/of_regulator.h>
  25#endif
  26
  27#include <linux/mfd/da9052/da9052.h>
  28#include <linux/mfd/da9052/reg.h>
  29#include <linux/mfd/da9052/pdata.h>
  30
  31/* Buck step size */
  32#define DA9052_BUCK_PERI_3uV_STEP               100000
  33#define DA9052_BUCK_PERI_REG_MAP_UPTO_3uV       24
  34#define DA9052_CONST_3uV                        3000000
  35
  36#define DA9052_MIN_UA           0
  37#define DA9052_MAX_UA           3
  38#define DA9052_CURRENT_RANGE    4
  39
  40/* Bit masks */
  41#define DA9052_BUCK_ILIM_MASK_EVEN      0x0c
  42#define DA9052_BUCK_ILIM_MASK_ODD       0xc0
  43
  44/* DA9052 REGULATOR IDs */
  45#define DA9052_ID_BUCK1         0
  46#define DA9052_ID_BUCK2         1
  47#define DA9052_ID_BUCK3         2
  48#define DA9052_ID_BUCK4         3
  49#define DA9052_ID_LDO1          4
  50#define DA9052_ID_LDO2          5
  51#define DA9052_ID_LDO3          6
  52#define DA9052_ID_LDO4          7
  53#define DA9052_ID_LDO5          8
  54#define DA9052_ID_LDO6          9
  55#define DA9052_ID_LDO7          10
  56#define DA9052_ID_LDO8          11
  57#define DA9052_ID_LDO9          12
  58#define DA9052_ID_LDO10         13
  59
  60static const u32 da9052_current_limits[3][4] = {
  61        {700000, 800000, 1000000, 1200000},     /* DA9052-BC BUCKs */
  62        {1600000, 2000000, 2400000, 3000000},   /* DA9053-AA/Bx BUCK-CORE */
  63        {800000, 1000000, 1200000, 1500000},    /* DA9053-AA/Bx BUCK-PRO,
  64                                                 * BUCK-MEM and BUCK-PERI
  65                                                */
  66};
  67
  68struct da9052_regulator_info {
  69        struct regulator_desc reg_desc;
  70        int step_uV;
  71        int min_uV;
  72        int max_uV;
  73        unsigned char activate_bit;
  74};
  75
  76struct da9052_regulator {
  77        struct da9052 *da9052;
  78        struct da9052_regulator_info *info;
  79        struct regulator_dev *rdev;
  80};
  81
  82static int verify_range(struct da9052_regulator_info *info,
  83                         int min_uV, int max_uV)
  84{
  85        if (min_uV > info->max_uV || max_uV < info->min_uV)
  86                return -EINVAL;
  87
  88        return 0;
  89}
  90
  91static int da9052_dcdc_get_current_limit(struct regulator_dev *rdev)
  92{
  93        struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
  94        int offset = rdev_get_id(rdev);
  95        int ret, row = 2;
  96
  97        ret = da9052_reg_read(regulator->da9052, DA9052_BUCKA_REG + offset/2);
  98        if (ret < 0)
  99                return ret;
 100
 101        /* Determine the even or odd position of the buck current limit
 102         * register field
 103        */
 104        if (offset % 2 == 0)
 105                ret = (ret & DA9052_BUCK_ILIM_MASK_EVEN) >> 2;
 106        else
 107                ret = (ret & DA9052_BUCK_ILIM_MASK_ODD) >> 6;
 108
 109        /* Select the appropriate current limit range */
 110        if (regulator->da9052->chip_id == DA9052)
 111                row = 0;
 112        else if (offset == 0)
 113                row = 1;
 114
 115        return da9052_current_limits[row][ret];
 116}
 117
 118static int da9052_dcdc_set_current_limit(struct regulator_dev *rdev, int min_uA,
 119                                          int max_uA)
 120{
 121        struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
 122        int offset = rdev_get_id(rdev);
 123        int reg_val = 0;
 124        int i, row = 2;
 125
 126        /* Select the appropriate current limit range */
 127        if (regulator->da9052->chip_id == DA9052)
 128                row = 0;
 129        else if (offset == 0)
 130                row = 1;
 131
 132        for (i = DA9052_CURRENT_RANGE - 1; i >= 0; i--) {
 133                if ((min_uA <= da9052_current_limits[row][i]) &&
 134                    (da9052_current_limits[row][i] <= max_uA)) {
 135                        reg_val = i;
 136                        break;
 137                }
 138        }
 139
 140        if (i < 0)
 141                return -EINVAL;
 142
 143        /* Determine the even or odd position of the buck current limit
 144         * register field
 145        */
 146        if (offset % 2 == 0)
 147                return da9052_reg_update(regulator->da9052,
 148                                         DA9052_BUCKA_REG + offset/2,
 149                                         DA9052_BUCK_ILIM_MASK_EVEN,
 150                                         reg_val << 2);
 151        else
 152                return da9052_reg_update(regulator->da9052,
 153                                         DA9052_BUCKA_REG + offset/2,
 154                                         DA9052_BUCK_ILIM_MASK_ODD,
 155                                         reg_val << 6);
 156}
 157
 158static int da9052_list_voltage(struct regulator_dev *rdev,
 159                                unsigned int selector)
 160{
 161        struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
 162        struct da9052_regulator_info *info = regulator->info;
 163        int id = rdev_get_id(rdev);
 164        int volt_uV;
 165
 166        if ((id == DA9052_ID_BUCK4) && (regulator->da9052->chip_id == DA9052)
 167                && (selector >= DA9052_BUCK_PERI_REG_MAP_UPTO_3uV)) {
 168                volt_uV = ((DA9052_BUCK_PERI_REG_MAP_UPTO_3uV * info->step_uV)
 169                          + info->min_uV);
 170                volt_uV += (selector - DA9052_BUCK_PERI_REG_MAP_UPTO_3uV)
 171                                    * (DA9052_BUCK_PERI_3uV_STEP);
 172        } else {
 173                volt_uV = (selector * info->step_uV) + info->min_uV;
 174        }
 175
 176        if (volt_uV > info->max_uV)
 177                return -EINVAL;
 178
 179        return volt_uV;
 180}
 181
 182static int da9052_map_voltage(struct regulator_dev *rdev,
 183                              int min_uV, int max_uV)
 184{
 185        struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
 186        struct da9052_regulator_info *info = regulator->info;
 187        int id = rdev_get_id(rdev);
 188        int ret, sel;
 189
 190        ret = verify_range(info, min_uV, max_uV);
 191        if (ret < 0)
 192                return ret;
 193
 194        if (min_uV < info->min_uV)
 195                min_uV = info->min_uV;
 196
 197        if ((id == DA9052_ID_BUCK4) && (regulator->da9052->chip_id == DA9052)
 198                && (min_uV >= DA9052_CONST_3uV)) {
 199                        sel = DA9052_BUCK_PERI_REG_MAP_UPTO_3uV +
 200                              DIV_ROUND_UP(min_uV - DA9052_CONST_3uV,
 201                                           DA9052_BUCK_PERI_3uV_STEP);
 202        } else {
 203                sel = DIV_ROUND_UP(min_uV - info->min_uV, info->step_uV);
 204        }
 205
 206        ret = da9052_list_voltage(rdev, sel);
 207        if (ret < 0)
 208                return ret;
 209
 210        return sel;
 211}
 212
 213static int da9052_regulator_set_voltage_sel(struct regulator_dev *rdev,
 214                                            unsigned int selector)
 215{
 216        struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
 217        struct da9052_regulator_info *info = regulator->info;
 218        int id = rdev_get_id(rdev);
 219        int ret;
 220
 221        ret = da9052_reg_update(regulator->da9052, rdev->desc->vsel_reg,
 222                                rdev->desc->vsel_mask, selector);
 223        if (ret < 0)
 224                return ret;
 225
 226        /* Some LDOs and DCDCs are DVC controlled which requires enabling of
 227         * the activate bit to implment the changes on the output.
 228         */
 229        switch (id) {
 230        case DA9052_ID_BUCK1:
 231        case DA9052_ID_BUCK2:
 232        case DA9052_ID_BUCK3:
 233        case DA9052_ID_LDO2:
 234        case DA9052_ID_LDO3:
 235                ret = da9052_reg_update(regulator->da9052, DA9052_SUPPLY_REG,
 236                                        info->activate_bit, info->activate_bit);
 237                break;
 238        }
 239
 240        return ret;
 241}
 242
 243static int da9052_regulator_set_voltage_time_sel(struct regulator_dev *rdev,
 244                                                 unsigned int old_sel,
 245                                                 unsigned int new_sel)
 246{
 247        struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
 248        struct da9052_regulator_info *info = regulator->info;
 249        int id = rdev_get_id(rdev);
 250        int ret = 0;
 251
 252        /* The DVC controlled LDOs and DCDCs ramp with 6.25mV/µs after enabling
 253         * the activate bit.
 254         */
 255        switch (id) {
 256        case DA9052_ID_BUCK1:
 257        case DA9052_ID_BUCK2:
 258        case DA9052_ID_BUCK3:
 259        case DA9052_ID_LDO2:
 260        case DA9052_ID_LDO3:
 261                ret = (new_sel - old_sel) * info->step_uV / 6250;
 262                break;
 263        }
 264
 265        return ret;
 266}
 267
 268static const struct regulator_ops da9052_dcdc_ops = {
 269        .get_current_limit = da9052_dcdc_get_current_limit,
 270        .set_current_limit = da9052_dcdc_set_current_limit,
 271
 272        .list_voltage = da9052_list_voltage,
 273        .map_voltage = da9052_map_voltage,
 274        .get_voltage_sel = regulator_get_voltage_sel_regmap,
 275        .set_voltage_sel = da9052_regulator_set_voltage_sel,
 276        .set_voltage_time_sel = da9052_regulator_set_voltage_time_sel,
 277        .is_enabled = regulator_is_enabled_regmap,
 278        .enable = regulator_enable_regmap,
 279        .disable = regulator_disable_regmap,
 280};
 281
 282static const struct regulator_ops da9052_ldo_ops = {
 283        .list_voltage = da9052_list_voltage,
 284        .map_voltage = da9052_map_voltage,
 285        .get_voltage_sel = regulator_get_voltage_sel_regmap,
 286        .set_voltage_sel = da9052_regulator_set_voltage_sel,
 287        .set_voltage_time_sel = da9052_regulator_set_voltage_time_sel,
 288        .is_enabled = regulator_is_enabled_regmap,
 289        .enable = regulator_enable_regmap,
 290        .disable = regulator_disable_regmap,
 291};
 292
 293#define DA9052_LDO(_id, step, min, max, sbits, ebits, abits) \
 294{\
 295        .reg_desc = {\
 296                .name = #_id,\
 297                .ops = &da9052_ldo_ops,\
 298                .type = REGULATOR_VOLTAGE,\
 299                .id = DA9052_ID_##_id,\
 300                .n_voltages = (max - min) / step + 1, \
 301                .owner = THIS_MODULE,\
 302                .vsel_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \
 303                .vsel_mask = (1 << (sbits)) - 1,\
 304                .enable_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \
 305                .enable_mask = 1 << (ebits),\
 306        },\
 307        .min_uV = (min) * 1000,\
 308        .max_uV = (max) * 1000,\
 309        .step_uV = (step) * 1000,\
 310        .activate_bit = (abits),\
 311}
 312
 313#define DA9052_DCDC(_id, step, min, max, sbits, ebits, abits) \
 314{\
 315        .reg_desc = {\
 316                .name = #_id,\
 317                .ops = &da9052_dcdc_ops,\
 318                .type = REGULATOR_VOLTAGE,\
 319                .id = DA9052_ID_##_id,\
 320                .n_voltages = (max - min) / step + 1, \
 321                .owner = THIS_MODULE,\
 322                .vsel_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \
 323                .vsel_mask = (1 << (sbits)) - 1,\
 324                .enable_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \
 325                .enable_mask = 1 << (ebits),\
 326        },\
 327        .min_uV = (min) * 1000,\
 328        .max_uV = (max) * 1000,\
 329        .step_uV = (step) * 1000,\
 330        .activate_bit = (abits),\
 331}
 332
 333static struct da9052_regulator_info da9052_regulator_info[] = {
 334        DA9052_DCDC(BUCK1, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBCOREGO),
 335        DA9052_DCDC(BUCK2, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBPROGO),
 336        DA9052_DCDC(BUCK3, 25, 950, 2525, 6, 6, DA9052_SUPPLY_VBMEMGO),
 337        DA9052_DCDC(BUCK4, 50, 1800, 3600, 5, 6, 0),
 338        DA9052_LDO(LDO1, 50, 600, 1800, 5, 6, 0),
 339        DA9052_LDO(LDO2, 25, 600, 1800, 6, 6, DA9052_SUPPLY_VLDO2GO),
 340        DA9052_LDO(LDO3, 25, 1725, 3300, 6, 6, DA9052_SUPPLY_VLDO3GO),
 341        DA9052_LDO(LDO4, 25, 1725, 3300, 6, 6, 0),
 342        DA9052_LDO(LDO5, 50, 1200, 3600, 6, 6, 0),
 343        DA9052_LDO(LDO6, 50, 1200, 3600, 6, 6, 0),
 344        DA9052_LDO(LDO7, 50, 1200, 3600, 6, 6, 0),
 345        DA9052_LDO(LDO8, 50, 1200, 3600, 6, 6, 0),
 346        DA9052_LDO(LDO9, 50, 1250, 3650, 6, 6, 0),
 347        DA9052_LDO(LDO10, 50, 1200, 3600, 6, 6, 0),
 348};
 349
 350static struct da9052_regulator_info da9053_regulator_info[] = {
 351        DA9052_DCDC(BUCK1, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBCOREGO),
 352        DA9052_DCDC(BUCK2, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBPROGO),
 353        DA9052_DCDC(BUCK3, 25, 950, 2525, 6, 6, DA9052_SUPPLY_VBMEMGO),
 354        DA9052_DCDC(BUCK4, 25, 950, 2525, 6, 6, 0),
 355        DA9052_LDO(LDO1, 50, 600, 1800, 5, 6, 0),
 356        DA9052_LDO(LDO2, 25, 600, 1800, 6, 6, DA9052_SUPPLY_VLDO2GO),
 357        DA9052_LDO(LDO3, 25, 1725, 3300, 6, 6, DA9052_SUPPLY_VLDO3GO),
 358        DA9052_LDO(LDO4, 25, 1725, 3300, 6, 6, 0),
 359        DA9052_LDO(LDO5, 50, 1200, 3600, 6, 6, 0),
 360        DA9052_LDO(LDO6, 50, 1200, 3600, 6, 6, 0),
 361        DA9052_LDO(LDO7, 50, 1200, 3600, 6, 6, 0),
 362        DA9052_LDO(LDO8, 50, 1200, 3600, 6, 6, 0),
 363        DA9052_LDO(LDO9, 50, 1250, 3650, 6, 6, 0),
 364        DA9052_LDO(LDO10, 50, 1200, 3600, 6, 6, 0),
 365};
 366
 367static inline struct da9052_regulator_info *find_regulator_info(u8 chip_id,
 368                                                                 int id)
 369{
 370        struct da9052_regulator_info *info;
 371        int i;
 372
 373        switch (chip_id) {
 374        case DA9052:
 375                for (i = 0; i < ARRAY_SIZE(da9052_regulator_info); i++) {
 376                        info = &da9052_regulator_info[i];
 377                        if (info->reg_desc.id == id)
 378                                return info;
 379                }
 380                break;
 381        case DA9053_AA:
 382        case DA9053_BA:
 383        case DA9053_BB:
 384        case DA9053_BC:
 385                for (i = 0; i < ARRAY_SIZE(da9053_regulator_info); i++) {
 386                        info = &da9053_regulator_info[i];
 387                        if (info->reg_desc.id == id)
 388                                return info;
 389                }
 390                break;
 391        }
 392
 393        return NULL;
 394}
 395
 396static int da9052_regulator_probe(struct platform_device *pdev)
 397{
 398        const struct mfd_cell *cell = mfd_get_cell(pdev);
 399        struct regulator_config config = { };
 400        struct da9052_regulator *regulator;
 401        struct da9052 *da9052;
 402        struct da9052_pdata *pdata;
 403
 404        regulator = devm_kzalloc(&pdev->dev, sizeof(struct da9052_regulator),
 405                                 GFP_KERNEL);
 406        if (!regulator)
 407                return -ENOMEM;
 408
 409        da9052 = dev_get_drvdata(pdev->dev.parent);
 410        pdata = dev_get_platdata(da9052->dev);
 411        regulator->da9052 = da9052;
 412
 413        regulator->info = find_regulator_info(regulator->da9052->chip_id,
 414                                              cell->id);
 415        if (regulator->info == NULL) {
 416                dev_err(&pdev->dev, "invalid regulator ID specified\n");
 417                return -EINVAL;
 418        }
 419
 420        config.dev = &pdev->dev;
 421        config.driver_data = regulator;
 422        config.regmap = da9052->regmap;
 423        if (pdata && pdata->regulators) {
 424                config.init_data = pdata->regulators[cell->id];
 425        } else {
 426#ifdef CONFIG_OF
 427                struct device_node *nproot = da9052->dev->of_node;
 428                struct device_node *np;
 429
 430                if (!nproot)
 431                        return -ENODEV;
 432
 433                nproot = of_get_child_by_name(nproot, "regulators");
 434                if (!nproot)
 435                        return -ENODEV;
 436
 437                for_each_child_of_node(nproot, np) {
 438                        if (!of_node_cmp(np->name,
 439                                         regulator->info->reg_desc.name)) {
 440                                config.init_data = of_get_regulator_init_data(
 441                                        &pdev->dev, np,
 442                                        &regulator->info->reg_desc);
 443                                config.of_node = np;
 444                                break;
 445                        }
 446                }
 447                of_node_put(nproot);
 448#endif
 449        }
 450
 451        regulator->rdev = devm_regulator_register(&pdev->dev,
 452                                                  &regulator->info->reg_desc,
 453                                                  &config);
 454        if (IS_ERR(regulator->rdev)) {
 455                dev_err(&pdev->dev, "failed to register regulator %s\n",
 456                        regulator->info->reg_desc.name);
 457                return PTR_ERR(regulator->rdev);
 458        }
 459
 460        platform_set_drvdata(pdev, regulator);
 461
 462        return 0;
 463}
 464
 465static struct platform_driver da9052_regulator_driver = {
 466        .probe = da9052_regulator_probe,
 467        .driver = {
 468                .name = "da9052-regulator",
 469        },
 470};
 471
 472static int __init da9052_regulator_init(void)
 473{
 474        return platform_driver_register(&da9052_regulator_driver);
 475}
 476subsys_initcall(da9052_regulator_init);
 477
 478static void __exit da9052_regulator_exit(void)
 479{
 480        platform_driver_unregister(&da9052_regulator_driver);
 481}
 482module_exit(da9052_regulator_exit);
 483
 484MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
 485MODULE_DESCRIPTION("Power Regulator driver for Dialog DA9052 PMIC");
 486MODULE_LICENSE("GPL");
 487MODULE_ALIAS("platform:da9052-regulator");
 488