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        if (min_uA > da9052_current_limits[row][DA9052_MAX_UA] ||
 133            max_uA < da9052_current_limits[row][DA9052_MIN_UA])
 134                return -EINVAL;
 135
 136        for (i = 0; i < DA9052_CURRENT_RANGE; i++) {
 137                if (min_uA <= da9052_current_limits[row][i]) {
 138                        reg_val = i;
 139                        break;
 140                }
 141        }
 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 struct regulator_ops da9052_dcdc_ops = {
 244        .get_current_limit = da9052_dcdc_get_current_limit,
 245        .set_current_limit = da9052_dcdc_set_current_limit,
 246
 247        .list_voltage = da9052_list_voltage,
 248        .map_voltage = da9052_map_voltage,
 249        .get_voltage_sel = regulator_get_voltage_sel_regmap,
 250        .set_voltage_sel = da9052_regulator_set_voltage_sel,
 251        .is_enabled = regulator_is_enabled_regmap,
 252        .enable = regulator_enable_regmap,
 253        .disable = regulator_disable_regmap,
 254};
 255
 256static struct regulator_ops da9052_ldo_ops = {
 257        .list_voltage = da9052_list_voltage,
 258        .map_voltage = da9052_map_voltage,
 259        .get_voltage_sel = regulator_get_voltage_sel_regmap,
 260        .set_voltage_sel = da9052_regulator_set_voltage_sel,
 261        .is_enabled = regulator_is_enabled_regmap,
 262        .enable = regulator_enable_regmap,
 263        .disable = regulator_disable_regmap,
 264};
 265
 266#define DA9052_LDO(_id, step, min, max, sbits, ebits, abits) \
 267{\
 268        .reg_desc = {\
 269                .name = #_id,\
 270                .ops = &da9052_ldo_ops,\
 271                .type = REGULATOR_VOLTAGE,\
 272                .id = DA9052_ID_##_id,\
 273                .n_voltages = (max - min) / step + 1, \
 274                .owner = THIS_MODULE,\
 275                .vsel_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \
 276                .vsel_mask = (1 << (sbits)) - 1,\
 277                .enable_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \
 278                .enable_mask = 1 << (ebits),\
 279        },\
 280        .min_uV = (min) * 1000,\
 281        .max_uV = (max) * 1000,\
 282        .step_uV = (step) * 1000,\
 283        .activate_bit = (abits),\
 284}
 285
 286#define DA9052_DCDC(_id, step, min, max, sbits, ebits, abits) \
 287{\
 288        .reg_desc = {\
 289                .name = #_id,\
 290                .ops = &da9052_dcdc_ops,\
 291                .type = REGULATOR_VOLTAGE,\
 292                .id = DA9052_ID_##_id,\
 293                .n_voltages = (max - min) / step + 1, \
 294                .owner = THIS_MODULE,\
 295                .vsel_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \
 296                .vsel_mask = (1 << (sbits)) - 1,\
 297                .enable_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \
 298                .enable_mask = 1 << (ebits),\
 299        },\
 300        .min_uV = (min) * 1000,\
 301        .max_uV = (max) * 1000,\
 302        .step_uV = (step) * 1000,\
 303        .activate_bit = (abits),\
 304}
 305
 306static struct da9052_regulator_info da9052_regulator_info[] = {
 307        DA9052_DCDC(BUCK1, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBCOREGO),
 308        DA9052_DCDC(BUCK2, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBPROGO),
 309        DA9052_DCDC(BUCK3, 25, 925, 2500, 6, 6, DA9052_SUPPLY_VBMEMGO),
 310        DA9052_DCDC(BUCK4, 50, 1800, 3600, 5, 6, 0),
 311        DA9052_LDO(LDO1, 50, 600, 1800, 5, 6, 0),
 312        DA9052_LDO(LDO2, 25, 600, 1800, 6, 6, DA9052_SUPPLY_VLDO2GO),
 313        DA9052_LDO(LDO3, 25, 1725, 3300, 6, 6, DA9052_SUPPLY_VLDO3GO),
 314        DA9052_LDO(LDO4, 25, 1725, 3300, 6, 6, 0),
 315        DA9052_LDO(LDO5, 50, 1200, 3600, 6, 6, 0),
 316        DA9052_LDO(LDO6, 50, 1200, 3600, 6, 6, 0),
 317        DA9052_LDO(LDO7, 50, 1200, 3600, 6, 6, 0),
 318        DA9052_LDO(LDO8, 50, 1200, 3600, 6, 6, 0),
 319        DA9052_LDO(LDO9, 50, 1250, 3650, 6, 6, 0),
 320        DA9052_LDO(LDO10, 50, 1200, 3600, 6, 6, 0),
 321};
 322
 323static struct da9052_regulator_info da9053_regulator_info[] = {
 324        DA9052_DCDC(BUCK1, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBCOREGO),
 325        DA9052_DCDC(BUCK2, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBPROGO),
 326        DA9052_DCDC(BUCK3, 25, 925, 2500, 6, 6, DA9052_SUPPLY_VBMEMGO),
 327        DA9052_DCDC(BUCK4, 25, 925, 2500, 6, 6, 0),
 328        DA9052_LDO(LDO1, 50, 600, 1800, 5, 6, 0),
 329        DA9052_LDO(LDO2, 25, 600, 1800, 6, 6, DA9052_SUPPLY_VLDO2GO),
 330        DA9052_LDO(LDO3, 25, 1725, 3300, 6, 6, DA9052_SUPPLY_VLDO3GO),
 331        DA9052_LDO(LDO4, 25, 1725, 3300, 6, 6, 0),
 332        DA9052_LDO(LDO5, 50, 1200, 3600, 6, 6, 0),
 333        DA9052_LDO(LDO6, 50, 1200, 3600, 6, 6, 0),
 334        DA9052_LDO(LDO7, 50, 1200, 3600, 6, 6, 0),
 335        DA9052_LDO(LDO8, 50, 1200, 3600, 6, 6, 0),
 336        DA9052_LDO(LDO9, 50, 1250, 3650, 6, 6, 0),
 337        DA9052_LDO(LDO10, 50, 1200, 3600, 6, 6, 0),
 338};
 339
 340static inline struct da9052_regulator_info *find_regulator_info(u8 chip_id,
 341                                                                 int id)
 342{
 343        struct da9052_regulator_info *info;
 344        int i;
 345
 346        switch (chip_id) {
 347        case DA9052:
 348                for (i = 0; i < ARRAY_SIZE(da9052_regulator_info); i++) {
 349                        info = &da9052_regulator_info[i];
 350                        if (info->reg_desc.id == id)
 351                                return info;
 352                }
 353                break;
 354        case DA9053_AA:
 355        case DA9053_BA:
 356        case DA9053_BB:
 357                for (i = 0; i < ARRAY_SIZE(da9053_regulator_info); i++) {
 358                        info = &da9053_regulator_info[i];
 359                        if (info->reg_desc.id == id)
 360                                return info;
 361                }
 362                break;
 363        }
 364
 365        return NULL;
 366}
 367
 368static int __devinit da9052_regulator_probe(struct platform_device *pdev)
 369{
 370        struct regulator_config config = { };
 371        struct da9052_regulator *regulator;
 372        struct da9052 *da9052;
 373        struct da9052_pdata *pdata;
 374
 375        regulator = devm_kzalloc(&pdev->dev, sizeof(struct da9052_regulator),
 376                                 GFP_KERNEL);
 377        if (!regulator)
 378                return -ENOMEM;
 379
 380        da9052 = dev_get_drvdata(pdev->dev.parent);
 381        pdata = da9052->dev->platform_data;
 382        regulator->da9052 = da9052;
 383
 384        regulator->info = find_regulator_info(regulator->da9052->chip_id,
 385                                              pdev->id);
 386        if (regulator->info == NULL) {
 387                dev_err(&pdev->dev, "invalid regulator ID specified\n");
 388                return -EINVAL;
 389        }
 390
 391        config.dev = &pdev->dev;
 392        config.driver_data = regulator;
 393        config.regmap = da9052->regmap;
 394        if (pdata && pdata->regulators) {
 395                config.init_data = pdata->regulators[pdev->id];
 396        } else {
 397#ifdef CONFIG_OF
 398                struct device_node *nproot = da9052->dev->of_node;
 399                struct device_node *np;
 400
 401                if (!nproot)
 402                        return -ENODEV;
 403
 404                nproot = of_find_node_by_name(nproot, "regulators");
 405                if (!nproot)
 406                        return -ENODEV;
 407
 408                for_each_child_of_node(nproot, np) {
 409                        if (!of_node_cmp(np->name,
 410                                         regulator->info->reg_desc.name)) {
 411                                config.init_data = of_get_regulator_init_data(
 412                                        &pdev->dev, np);
 413                                config.of_node = np;
 414                                break;
 415                        }
 416                }
 417#endif
 418        }
 419
 420        regulator->rdev = regulator_register(&regulator->info->reg_desc,
 421                                             &config);
 422        if (IS_ERR(regulator->rdev)) {
 423                dev_err(&pdev->dev, "failed to register regulator %s\n",
 424                        regulator->info->reg_desc.name);
 425                return PTR_ERR(regulator->rdev);
 426        }
 427
 428        platform_set_drvdata(pdev, regulator);
 429
 430        return 0;
 431}
 432
 433static int __devexit da9052_regulator_remove(struct platform_device *pdev)
 434{
 435        struct da9052_regulator *regulator = platform_get_drvdata(pdev);
 436
 437        regulator_unregister(regulator->rdev);
 438        return 0;
 439}
 440
 441static struct platform_driver da9052_regulator_driver = {
 442        .probe = da9052_regulator_probe,
 443        .remove = __devexit_p(da9052_regulator_remove),
 444        .driver = {
 445                .name = "da9052-regulator",
 446                .owner = THIS_MODULE,
 447        },
 448};
 449
 450static int __init da9052_regulator_init(void)
 451{
 452        return platform_driver_register(&da9052_regulator_driver);
 453}
 454subsys_initcall(da9052_regulator_init);
 455
 456static void __exit da9052_regulator_exit(void)
 457{
 458        platform_driver_unregister(&da9052_regulator_driver);
 459}
 460module_exit(da9052_regulator_exit);
 461
 462MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
 463MODULE_DESCRIPTION("Power Regulator driver for Dialog DA9052 PMIC");
 464MODULE_LICENSE("GPL");
 465MODULE_ALIAS("platform:da9052-regulator");
 466
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