drivers/regulator/tps65218-regulator.c

   1 /*
   2  * tps65218-regulator.c
   3  *
   4  * Regulator driver for TPS65218 PMIC
   5  *
   6  * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com/
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  *
  12  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  13  * kind, whether expressed or implied; without even the implied warranty
  14  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License version 2 for more details.
  16  */
  17
  18 #include <linux/kernel.h>
  19 #include <linux/module.h>
  20 #include <linux/device.h>
  21 #include <linux/init.h>
  22 #include <linux/err.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/of_device.h>
  25 #include <linux/regmap.h>
  26 #include <linux/regulator/of_regulator.h>
  27 #include <linux/regulator/driver.h>
  28 #include <linux/regulator/machine.h>
  29 #include <linux/mfd/tps65218.h>
  30
  31 #define TPS65218_REGULATOR(_name, _of, _id, _type, _ops, _n, _vr, _vm, _er, \
  32                            _em, _cr, _cm, _lr, _nlr, _delay, _fuv, _sr, _sm) \
  33         {                                                       \
  34                 .name                   = _name,                \
  35                 .of_match               = _of,                  \
  36                 .id                     = _id,                  \
  37                 .ops                    = &_ops,                \
  38                 .n_voltages             = _n,                   \
  39                 .type                   = _type,        \
  40                 .owner                  = THIS_MODULE,          \
  41                 .vsel_reg               = _vr,                  \
  42                 .vsel_mask              = _vm,                  \
  43                 .csel_reg               = _cr,                  \
  44                 .csel_mask              = _cm,                  \
  45                 .enable_reg             = _er,                  \
  46                 .enable_mask            = _em,                  \
  47                 .volt_table             = NULL,                 \
  48                 .linear_ranges          = _lr,                  \
  49                 .n_linear_ranges        = _nlr,                 \
  50                 .ramp_delay             = _delay,               \
  51                 .fixed_uV               = _fuv,                 \
  52                 .bypass_reg     = _sr,                          \
  53                 .bypass_mask    = _sm,                          \
  54         }                                                       \
  55
  56 static const struct regulator_linear_range dcdc1_dcdc2_ranges[] = {
  57         REGULATOR_LINEAR_RANGE(850000, 0x0, 0x32, 10000),
  58         REGULATOR_LINEAR_RANGE(1375000, 0x33, 0x3f, 25000),
  59 };
  60
  61 static const struct regulator_linear_range ldo1_dcdc3_ranges[] = {
  62         REGULATOR_LINEAR_RANGE(900000, 0x0, 0x1a, 25000),
  63         REGULATOR_LINEAR_RANGE(1600000, 0x1b, 0x3f, 50000),
  64 };
  65
  66 static const struct regulator_linear_range dcdc4_ranges[] = {
  67         REGULATOR_LINEAR_RANGE(1175000, 0x0, 0xf, 25000),
  68         REGULATOR_LINEAR_RANGE(1600000, 0x10, 0x34, 50000),
  69 };
  70
  71 static int tps65218_pmic_set_voltage_sel(struct regulator_dev *dev,
  72                                          unsigned selector)
  73 {
  74         int ret;
  75         struct tps65218 *tps = rdev_get_drvdata(dev);
  76         unsigned int rid = rdev_get_id(dev);
  77
  78         /* Set the voltage based on vsel value and write protect level is 2 */
  79         ret = tps65218_set_bits(tps, dev->desc->vsel_reg, dev->desc->vsel_mask,
  80                                 selector, TPS65218_PROTECT_L1);
  81
  82         /* Set GO bit for DCDC1/2 to initiate voltage transistion */
  83         switch (rid) {
  84         case TPS65218_DCDC_1:
  85         case TPS65218_DCDC_2:
  86                 ret = tps65218_set_bits(tps, TPS65218_REG_CONTRL_SLEW_RATE,
  87                                         TPS65218_SLEW_RATE_GO,
  88                                         TPS65218_SLEW_RATE_GO,
  89                                         TPS65218_PROTECT_L1);
  90                 break;
  91         }
  92
  93         return ret;
  94 }
  95
  96 static int tps65218_pmic_enable(struct regulator_dev *dev)
  97 {
  98         struct tps65218 *tps = rdev_get_drvdata(dev);
  99         int rid = rdev_get_id(dev);
 100
 101         if (rid < TPS65218_DCDC_1 || rid > TPS65218_LDO_1)
 102                 return -EINVAL;
 103
 104         /* Enable the regulator and password protection is level 1 */
 105         return tps65218_set_bits(tps, dev->desc->enable_reg,
 106                                  dev->desc->enable_mask, dev->desc->enable_mask,
 107                                  TPS65218_PROTECT_L1);
 108 }
 109
 110 static int tps65218_pmic_disable(struct regulator_dev *dev)
 111 {
 112         struct tps65218 *tps = rdev_get_drvdata(dev);
 113         int rid = rdev_get_id(dev);
 114
 115         if (rid < TPS65218_DCDC_1 || rid > TPS65218_LDO_1)
 116                 return -EINVAL;
 117
 118         /* Disable the regulator and password protection is level 1 */
 119         return tps65218_clear_bits(tps, dev->desc->enable_reg,
 120                                    dev->desc->enable_mask, TPS65218_PROTECT_L1);
 121 }
 122
 123 static int tps65218_pmic_set_suspend_enable(struct regulator_dev *dev)
 124 {
 125         struct tps65218 *tps = rdev_get_drvdata(dev);
 126         unsigned int rid = rdev_get_id(dev);
 127
 128         if (rid < TPS65218_DCDC_1 || rid > TPS65218_LDO_1)
 129                 return -EINVAL;
 130
 131         return tps65218_clear_bits(tps, dev->desc->bypass_reg,
 132                                    dev->desc->bypass_mask,
 133                                    TPS65218_PROTECT_L1);
 134 }
 135
 136 static int tps65218_pmic_set_suspend_disable(struct regulator_dev *dev)
 137 {
 138         struct tps65218 *tps = rdev_get_drvdata(dev);
 139         unsigned int rid = rdev_get_id(dev);
 140
 141         if (rid < TPS65218_DCDC_1 || rid > TPS65218_LDO_1)
 142                 return -EINVAL;
 143
 144         /*
 145          * Certain revisions of TPS65218 will need to have DCDC3 regulator
 146          * enabled always, otherwise an immediate system reboot will occur
 147          * during poweroff.
 148          */
 149         if (rid == TPS65218_DCDC_3 && tps->rev == TPS65218_REV_2_1)
 150                 return 0;
 151
 152         if (!tps->strobes[rid]) {
 153                 if (rid == TPS65218_DCDC_3)
 154                         tps->strobes[rid] = 3;
 155                 else
 156                         return -EINVAL;
 157         }
 158
 159         return tps65218_set_bits(tps, dev->desc->bypass_reg,
 160                                  dev->desc->bypass_mask,
 161                                  tps->strobes[rid], TPS65218_PROTECT_L1);
 162 }
 163
 164 /* Operations permitted on DCDC1, DCDC2 */
 165 static struct regulator_ops tps65218_dcdc12_ops = {
 166         .is_enabled             = regulator_is_enabled_regmap,
 167         .enable                 = tps65218_pmic_enable,
 168         .disable                = tps65218_pmic_disable,
 169         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 170         .set_voltage_sel        = tps65218_pmic_set_voltage_sel,
 171         .list_voltage           = regulator_list_voltage_linear_range,
 172         .map_voltage            = regulator_map_voltage_linear_range,
 173         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 174         .set_suspend_enable     = tps65218_pmic_set_suspend_enable,
 175         .set_suspend_disable    = tps65218_pmic_set_suspend_disable,
 176 };
 177
 178 /* Operations permitted on DCDC3, DCDC4 and LDO1 */
 179 static struct regulator_ops tps65218_ldo1_dcdc34_ops = {
 180         .is_enabled             = regulator_is_enabled_regmap,
 181         .enable                 = tps65218_pmic_enable,
 182         .disable                = tps65218_pmic_disable,
 183         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 184         .set_voltage_sel        = tps65218_pmic_set_voltage_sel,
 185         .list_voltage           = regulator_list_voltage_linear_range,
 186         .map_voltage            = regulator_map_voltage_linear_range,
 187         .set_suspend_enable     = tps65218_pmic_set_suspend_enable,
 188         .set_suspend_disable    = tps65218_pmic_set_suspend_disable,
 189 };
 190
 191 static const int ls3_currents[] = { 100000, 200000, 500000, 1000000 };
 192
 193
 194 static int tps65218_pmic_set_input_current_lim(struct regulator_dev *dev,
 195                                                int lim_uA)
 196 {
 197         unsigned int index = 0;
 198         unsigned int num_currents = ARRAY_SIZE(ls3_currents);
 199         struct tps65218 *tps = rdev_get_drvdata(dev);
 200
 201         while (index < num_currents && ls3_currents[index] != lim_uA)
 202                 index++;
 203
 204         if (index == num_currents)
 205                 return -EINVAL;
 206
 207         return tps65218_set_bits(tps, dev->desc->csel_reg, dev->desc->csel_mask,
 208                                  index << __builtin_ctz(dev->desc->csel_mask),
 209                                  TPS65218_PROTECT_L1);
 210 }
 211
 212 static int tps65218_pmic_set_current_limit(struct regulator_dev *dev,
 213                                            int min_uA, int max_uA)
 214 {
 215         int index = 0;
 216         unsigned int num_currents = ARRAY_SIZE(ls3_currents);
 217         struct tps65218 *tps = rdev_get_drvdata(dev);
 218
 219         while (index < num_currents && ls3_currents[index] <= max_uA)
 220                 index++;
 221
 222         index--;
 223
 224         if (index < 0 || ls3_currents[index] < min_uA)
 225                 return -EINVAL;
 226
 227         return tps65218_set_bits(tps, dev->desc->csel_reg, dev->desc->csel_mask,
 228                                  index << __builtin_ctz(dev->desc->csel_mask),
 229                                  TPS65218_PROTECT_L1);
 230 }
 231
 232 static int tps65218_pmic_get_current_limit(struct regulator_dev *dev)
 233 {
 234         int retval;
 235         unsigned int index;
 236         struct tps65218 *tps = rdev_get_drvdata(dev);
 237
 238         retval = regmap_read(tps->regmap, dev->desc->csel_reg, &index);
 239         if (retval < 0)
 240                 return retval;
 241
 242         index = (index & dev->desc->csel_mask) >>
 243                                          __builtin_ctz(dev->desc->csel_mask);
 244
 245         return ls3_currents[index];
 246 }
 247
 248 static struct regulator_ops tps65218_ls23_ops = {
 249         .is_enabled             = regulator_is_enabled_regmap,
 250         .enable                 = tps65218_pmic_enable,
 251         .disable                = tps65218_pmic_disable,
 252         .set_input_current_limit = tps65218_pmic_set_input_current_lim,
 253         .set_current_limit      = tps65218_pmic_set_current_limit,
 254         .get_current_limit      = tps65218_pmic_get_current_limit,
 255 };
 256
 257 /* Operations permitted on DCDC5, DCDC6 */
 258 static struct regulator_ops tps65218_dcdc56_pmic_ops = {
 259         .is_enabled             = regulator_is_enabled_regmap,
 260         .enable                 = tps65218_pmic_enable,
 261         .disable                = tps65218_pmic_disable,
 262         .set_suspend_enable     = tps65218_pmic_set_suspend_enable,
 263         .set_suspend_disable    = tps65218_pmic_set_suspend_disable,
 264 };
 265
 266 static const struct regulator_desc regulators[] = {
 267         TPS65218_REGULATOR("DCDC1", "regulator-dcdc1", TPS65218_DCDC_1,
 268                            REGULATOR_VOLTAGE, tps65218_dcdc12_ops, 64,
 269                            TPS65218_REG_CONTROL_DCDC1,
 270                            TPS65218_CONTROL_DCDC1_MASK, TPS65218_REG_ENABLE1,
 271                            TPS65218_ENABLE1_DC1_EN, 0, 0, dcdc1_dcdc2_ranges,
 272                            2, 4000, 0, TPS65218_REG_SEQ3,
 273                            TPS65218_SEQ3_DC1_SEQ_MASK),
 274         TPS65218_REGULATOR("DCDC2", "regulator-dcdc2", TPS65218_DCDC_2,
 275                            REGULATOR_VOLTAGE, tps65218_dcdc12_ops, 64,
 276                            TPS65218_REG_CONTROL_DCDC2,
 277                            TPS65218_CONTROL_DCDC2_MASK, TPS65218_REG_ENABLE1,
 278                            TPS65218_ENABLE1_DC2_EN, 0, 0, dcdc1_dcdc2_ranges,
 279                            2, 4000, 0, TPS65218_REG_SEQ3,
 280                            TPS65218_SEQ3_DC2_SEQ_MASK),
 281         TPS65218_REGULATOR("DCDC3", "regulator-dcdc3", TPS65218_DCDC_3,
 282                            REGULATOR_VOLTAGE, tps65218_ldo1_dcdc34_ops, 64,
 283                            TPS65218_REG_CONTROL_DCDC3,
 284                            TPS65218_CONTROL_DCDC3_MASK, TPS65218_REG_ENABLE1,
 285                            TPS65218_ENABLE1_DC3_EN, 0, 0, ldo1_dcdc3_ranges, 2,
 286                            0, 0, TPS65218_REG_SEQ4, TPS65218_SEQ4_DC3_SEQ_MASK),
 287         TPS65218_REGULATOR("DCDC4", "regulator-dcdc4", TPS65218_DCDC_4,
 288                            REGULATOR_VOLTAGE, tps65218_ldo1_dcdc34_ops, 53,
 289                            TPS65218_REG_CONTROL_DCDC4,
 290                            TPS65218_CONTROL_DCDC4_MASK, TPS65218_REG_ENABLE1,
 291                            TPS65218_ENABLE1_DC4_EN, 0, 0, dcdc4_ranges, 2,
 292                            0, 0, TPS65218_REG_SEQ4, TPS65218_SEQ4_DC4_SEQ_MASK),
 293         TPS65218_REGULATOR("DCDC5", "regulator-dcdc5", TPS65218_DCDC_5,
 294                            REGULATOR_VOLTAGE, tps65218_dcdc56_pmic_ops, 1, -1,
 295                            -1, TPS65218_REG_ENABLE1, TPS65218_ENABLE1_DC5_EN, 0,
 296                            0, NULL, 0, 0, 1000000, TPS65218_REG_SEQ5,
 297                            TPS65218_SEQ5_DC5_SEQ_MASK),
 298         TPS65218_REGULATOR("DCDC6", "regulator-dcdc6", TPS65218_DCDC_6,
 299                            REGULATOR_VOLTAGE, tps65218_dcdc56_pmic_ops, 1, -1,
 300                            -1, TPS65218_REG_ENABLE1, TPS65218_ENABLE1_DC6_EN, 0,
 301                            0, NULL, 0, 0, 1800000, TPS65218_REG_SEQ5,
 302                            TPS65218_SEQ5_DC6_SEQ_MASK),
 303         TPS65218_REGULATOR("LDO1", "regulator-ldo1", TPS65218_LDO_1,
 304                            REGULATOR_VOLTAGE, tps65218_ldo1_dcdc34_ops, 64,
 305                            TPS65218_REG_CONTROL_LDO1,
 306                            TPS65218_CONTROL_LDO1_MASK, TPS65218_REG_ENABLE2,
 307                            TPS65218_ENABLE2_LDO1_EN, 0, 0, ldo1_dcdc3_ranges,
 308                            2, 0, 0, TPS65218_REG_SEQ6,
 309                            TPS65218_SEQ6_LDO1_SEQ_MASK),
 310         TPS65218_REGULATOR("LS2", "regulator-ls2", TPS65218_LS_2,
 311                            REGULATOR_CURRENT, tps65218_ls23_ops, 0, 0, 0,
 312                            TPS65218_REG_ENABLE2, TPS65218_ENABLE2_LS2_EN,
 313                            TPS65218_REG_CONFIG2, TPS65218_CONFIG2_LS2ILIM_MASK,
 314                            NULL, 0, 0, 0, 0, 0),
 315         TPS65218_REGULATOR("LS3", "regulator-ls3", TPS65218_LS_3,
 316                            REGULATOR_CURRENT, tps65218_ls23_ops, 0, 0, 0,
 317                            TPS65218_REG_ENABLE2, TPS65218_ENABLE2_LS3_EN,
 318                            TPS65218_REG_CONFIG2, TPS65218_CONFIG2_LS3ILIM_MASK,
 319                            NULL, 0, 0, 0, 0, 0),
 320 };
 321
 322 static int tps65218_regulator_probe(struct platform_device *pdev)
 323 {
 324         struct tps65218 *tps = dev_get_drvdata(pdev->dev.parent);
 325         struct regulator_dev *rdev;
 326         struct regulator_config config = { };
 327         int i, ret;
 328         unsigned int val;
 329
 330         config.dev = &pdev->dev;
 331         config.dev->of_node = tps->dev->of_node;
 332         config.driver_data = tps;
 333         config.regmap = tps->regmap;
 334
 335         /* Allocate memory for strobes */
 336         tps->strobes = devm_kcalloc(&pdev->dev,
 337                                     TPS65218_NUM_REGULATOR, sizeof(u8),
 338                                     GFP_KERNEL);
 339         if (!tps->strobes)
 340                 return -ENOMEM;
 341
 342         for (i = 0; i < ARRAY_SIZE(regulators); i++) {
 343                 rdev = devm_regulator_register(&pdev->dev, &regulators[i],
 344                                                &config);
 345                 if (IS_ERR(rdev)) {
 346                         dev_err(tps->dev, "failed to register %s regulator\n",
 347                                 pdev->name);
 348                         return PTR_ERR(rdev);
 349                 }
 350
 351                 ret = regmap_read(tps->regmap, regulators[i].bypass_reg, &val);
 352                 if (ret)
 353                         return ret;
 354
 355                 tps->strobes[i] = val & regulators[i].bypass_mask;
 356         }
 357
 358         return 0;
 359 }
 360
 361 static const struct platform_device_id tps65218_regulator_id_table[] = {
 362         { "tps65218-regulator", },
 363         { /* sentinel */ }
 364 };
 365 MODULE_DEVICE_TABLE(platform, tps65218_regulator_id_table);
 366
 367 static struct platform_driver tps65218_regulator_driver = {
 368         .driver = {
 369                 .name = "tps65218-pmic",
 370         },
 371         .probe = tps65218_regulator_probe,
 372         .id_table = tps65218_regulator_id_table,
 373 };
 374
 375 module_platform_driver(tps65218_regulator_driver);
 376
 377 MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
 378 MODULE_DESCRIPTION("TPS65218 voltage regulator driver");
 379 MODULE_ALIAS("platform:tps65218-pmic");
 380 MODULE_LICENSE("GPL v2");