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 enum tps65218_regulators { DCDC1, DCDC2, DCDC3, DCDC4,
  32                            DCDC5, DCDC6, LDO1, LS3 };
  33
  34 #define TPS65218_REGULATOR(_name, _of, _id, _type, _ops, _n, _vr, _vm, _er, \
  35                            _em, _cr, _cm, _lr, _nlr, _delay, _fuv, _sr, _sm) \
  36         {                                                       \
  37                 .name                   = _name,                \
  38                 .of_match               = _of,                  \
  39                 .id                     = _id,                  \
  40                 .ops                    = &_ops,                \
  41                 .n_voltages             = _n,                   \
  42                 .type                   = _type,        \
  43                 .owner                  = THIS_MODULE,          \
  44                 .vsel_reg               = _vr,                  \
  45                 .vsel_mask              = _vm,                  \
  46                 .csel_reg               = _cr,                  \
  47                 .csel_mask              = _cm,                  \
  48                 .enable_reg             = _er,                  \
  49                 .enable_mask            = _em,                  \
  50                 .volt_table             = NULL,                 \
  51                 .linear_ranges          = _lr,                  \
  52                 .n_linear_ranges        = _nlr,                 \
  53                 .ramp_delay             = _delay,               \
  54                 .fixed_uV               = _fuv,                 \
  55                 .bypass_reg     = _sr,                          \
  56                 .bypass_mask    = _sm,                          \
  57         }                                                       \
  58
  59 static const struct regulator_linear_range dcdc1_dcdc2_ranges[] = {
  60         REGULATOR_LINEAR_RANGE(850000, 0x0, 0x32, 10000),
  61         REGULATOR_LINEAR_RANGE(1375000, 0x33, 0x3f, 25000),
  62 };
  63
  64 static const struct regulator_linear_range ldo1_dcdc3_ranges[] = {
  65         REGULATOR_LINEAR_RANGE(900000, 0x0, 0x1a, 25000),
  66         REGULATOR_LINEAR_RANGE(1600000, 0x1b, 0x3f, 50000),
  67 };
  68
  69 static const struct regulator_linear_range dcdc4_ranges[] = {
  70         REGULATOR_LINEAR_RANGE(1175000, 0x0, 0xf, 25000),
  71         REGULATOR_LINEAR_RANGE(1600000, 0x10, 0x34, 50000),
  72 };
  73
  74 static int tps65218_pmic_set_voltage_sel(struct regulator_dev *dev,
  75                                          unsigned selector)
  76 {
  77         int ret;
  78         struct tps65218 *tps = rdev_get_drvdata(dev);
  79         unsigned int rid = rdev_get_id(dev);
  80
  81         /* Set the voltage based on vsel value and write protect level is 2 */
  82         ret = tps65218_set_bits(tps, dev->desc->vsel_reg, dev->desc->vsel_mask,
  83                                 selector, TPS65218_PROTECT_L1);
  84
  85         /* Set GO bit for DCDC1/2 to initiate voltage transistion */
  86         switch (rid) {
  87         case TPS65218_DCDC_1:
  88         case TPS65218_DCDC_2:
  89                 ret = tps65218_set_bits(tps, TPS65218_REG_CONTRL_SLEW_RATE,
  90                                         TPS65218_SLEW_RATE_GO,
  91                                         TPS65218_SLEW_RATE_GO,
  92                                         TPS65218_PROTECT_L1);
  93                 break;
  94         }
  95
  96         return ret;
  97 }
  98
  99 static int tps65218_pmic_enable(struct regulator_dev *dev)
 100 {
 101         struct tps65218 *tps = rdev_get_drvdata(dev);
 102         int rid = rdev_get_id(dev);
 103
 104         if (rid < TPS65218_DCDC_1 || rid > TPS65218_LDO_1)
 105                 return -EINVAL;
 106
 107         /* Enable the regulator and password protection is level 1 */
 108         return tps65218_set_bits(tps, dev->desc->enable_reg,
 109                                  dev->desc->enable_mask, dev->desc->enable_mask,
 110                                  TPS65218_PROTECT_L1);
 111 }
 112
 113 static int tps65218_pmic_disable(struct regulator_dev *dev)
 114 {
 115         struct tps65218 *tps = rdev_get_drvdata(dev);
 116         int rid = rdev_get_id(dev);
 117
 118         if (rid < TPS65218_DCDC_1 || rid > TPS65218_LDO_1)
 119                 return -EINVAL;
 120
 121         /* Disable the regulator and password protection is level 1 */
 122         return tps65218_clear_bits(tps, dev->desc->enable_reg,
 123                                    dev->desc->enable_mask, TPS65218_PROTECT_L1);
 124 }
 125
 126 static int tps65218_pmic_set_suspend_enable(struct regulator_dev *dev)
 127 {
 128         struct tps65218 *tps = rdev_get_drvdata(dev);
 129         unsigned int rid = rdev_get_id(dev);
 130
 131         if (rid < TPS65218_DCDC_1 || rid > TPS65218_LDO_1)
 132                 return -EINVAL;
 133
 134         return tps65218_clear_bits(tps, dev->desc->bypass_reg,
 135                                    dev->desc->bypass_mask,
 136                                    TPS65218_PROTECT_L1);
 137 }
 138
 139 static int tps65218_pmic_set_suspend_disable(struct regulator_dev *dev)
 140 {
 141         struct tps65218 *tps = rdev_get_drvdata(dev);
 142         unsigned int rid = rdev_get_id(dev);
 143
 144         if (rid < TPS65218_DCDC_1 || rid > TPS65218_LDO_1)
 145                 return -EINVAL;
 146
 147         /*
 148          * Certain revisions of TPS65218 will need to have DCDC3 regulator
 149          * enabled always, otherwise an immediate system reboot will occur
 150          * during poweroff.
 151          */
 152         if (rid == TPS65218_DCDC_3 && tps->rev == TPS65218_REV_2_1)
 153                 return 0;
 154
 155         if (!tps->strobes[rid]) {
 156                 if (rid == TPS65218_DCDC_3)
 157                         tps->info[rid]->strobe = 3;
 158                 else
 159                         return -EINVAL;
 160         }
 161
 162         return tps65218_set_bits(tps, dev->desc->bypass_reg,
 163                                  dev->desc->bypass_mask,
 164                                  tps->strobes[rid], TPS65218_PROTECT_L1);
 165 }
 166
 167 /* Operations permitted on DCDC1, DCDC2 */
 168 static struct regulator_ops tps65218_dcdc12_ops = {
 169         .is_enabled             = regulator_is_enabled_regmap,
 170         .enable                 = tps65218_pmic_enable,
 171         .disable                = tps65218_pmic_disable,
 172         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 173         .set_voltage_sel        = tps65218_pmic_set_voltage_sel,
 174         .list_voltage           = regulator_list_voltage_linear_range,
 175         .map_voltage            = regulator_map_voltage_linear_range,
 176         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 177         .set_suspend_enable     = tps65218_pmic_set_suspend_enable,
 178         .set_suspend_disable    = tps65218_pmic_set_suspend_disable,
 179 };
 180
 181 /* Operations permitted on DCDC3, DCDC4 and LDO1 */
 182 static struct regulator_ops tps65218_ldo1_dcdc34_ops = {
 183         .is_enabled             = regulator_is_enabled_regmap,
 184         .enable                 = tps65218_pmic_enable,
 185         .disable                = tps65218_pmic_disable,
 186         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 187         .set_voltage_sel        = tps65218_pmic_set_voltage_sel,
 188         .list_voltage           = regulator_list_voltage_linear_range,
 189         .map_voltage            = regulator_map_voltage_linear_range,
 190         .set_suspend_enable     = tps65218_pmic_set_suspend_enable,
 191         .set_suspend_disable    = tps65218_pmic_set_suspend_disable,
 192 };
 193
 194 static const int ls3_currents[] = { 100, 200, 500, 1000 };
 195
 196 static int tps65218_pmic_set_input_current_lim(struct regulator_dev *dev,
 197                                                int lim_uA)
 198 {
 199         unsigned int index = 0;
 200         unsigned int num_currents = ARRAY_SIZE(ls3_currents);
 201         struct tps65218 *tps = rdev_get_drvdata(dev);
 202
 203         while (index < num_currents && ls3_currents[index] != lim_uA)
 204                 index++;
 205
 206         if (index == num_currents)
 207                 return -EINVAL;
 208
 209         return tps65218_set_bits(tps, dev->desc->csel_reg, dev->desc->csel_mask,
 210                                  index << 2, TPS65218_PROTECT_L1);
 211 }
 212
 213 static int tps65218_pmic_set_current_limit(struct regulator_dev *dev,
 214                                            int min_uA, int max_uA)
 215 {
 216         int index = 0;
 217         unsigned int num_currents = ARRAY_SIZE(ls3_currents);
 218         struct tps65218 *tps = rdev_get_drvdata(dev);
 219
 220         while (index < num_currents && ls3_currents[index] < max_uA)
 221                 index++;
 222
 223         index--;
 224
 225         if (index < 0 || ls3_currents[index] < min_uA)
 226                 return -EINVAL;
 227
 228         return tps65218_set_bits(tps, dev->desc->csel_reg, dev->desc->csel_mask,
 229                                  index << 2, 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) >> 2;
 243
 244         return ls3_currents[index];
 245 }
 246
 247 static struct regulator_ops tps65218_ls3_ops = {
 248         .is_enabled             = regulator_is_enabled_regmap,
 249         .enable                 = tps65218_pmic_enable,
 250         .disable                = tps65218_pmic_disable,
 251         .set_input_current_limit = tps65218_pmic_set_input_current_lim,
 252         .set_current_limit      = tps65218_pmic_set_current_limit,
 253         .get_current_limit      = tps65218_pmic_get_current_limit,
 254 };
 255
 256 /* Operations permitted on DCDC5, DCDC6 */
 257 static struct regulator_ops tps65218_dcdc56_pmic_ops = {
 258         .is_enabled             = regulator_is_enabled_regmap,
 259         .enable                 = tps65218_pmic_enable,
 260         .disable                = tps65218_pmic_disable,
 261         .set_suspend_enable     = tps65218_pmic_set_suspend_enable,
 262         .set_suspend_disable    = tps65218_pmic_set_suspend_disable,
 263 };
 264
 265 static const struct regulator_desc regulators[] = {
 266         TPS65218_REGULATOR("DCDC1", "regulator-dcdc1", TPS65218_DCDC_1,
 267                            REGULATOR_VOLTAGE, tps65218_dcdc12_ops, 64,
 268                            TPS65218_REG_CONTROL_DCDC1,
 269                            TPS65218_CONTROL_DCDC1_MASK, TPS65218_REG_ENABLE1,
 270                            TPS65218_ENABLE1_DC1_EN, 0, 0, dcdc1_dcdc2_ranges,
 271                            2, 4000, 0, TPS65218_REG_SEQ3,
 272                            TPS65218_SEQ3_DC1_SEQ_MASK),
 273         TPS65218_REGULATOR("DCDC2", "regulator-dcdc2", TPS65218_DCDC_2,
 274                            REGULATOR_VOLTAGE, tps65218_dcdc12_ops, 64,
 275                            TPS65218_REG_CONTROL_DCDC2,
 276                            TPS65218_CONTROL_DCDC2_MASK, TPS65218_REG_ENABLE1,
 277                            TPS65218_ENABLE1_DC2_EN, 0, 0, dcdc1_dcdc2_ranges,
 278                            2, 4000, 0, TPS65218_REG_SEQ3,
 279                            TPS65218_SEQ3_DC2_SEQ_MASK),
 280         TPS65218_REGULATOR("DCDC3", "regulator-dcdc3", TPS65218_DCDC_3,
 281                            REGULATOR_VOLTAGE, tps65218_ldo1_dcdc34_ops, 64,
 282                            TPS65218_REG_CONTROL_DCDC3,
 283                            TPS65218_CONTROL_DCDC3_MASK, TPS65218_REG_ENABLE1,
 284                            TPS65218_ENABLE1_DC3_EN, 0, 0, ldo1_dcdc3_ranges, 2,
 285                            0, 0, TPS65218_REG_SEQ4, TPS65218_SEQ4_DC3_SEQ_MASK),
 286         TPS65218_REGULATOR("DCDC4", "regulator-dcdc4", TPS65218_DCDC_4,
 287                            REGULATOR_VOLTAGE, tps65218_ldo1_dcdc34_ops, 53,
 288                            TPS65218_REG_CONTROL_DCDC4,
 289                            TPS65218_CONTROL_DCDC4_MASK, TPS65218_REG_ENABLE1,
 290                            TPS65218_ENABLE1_DC4_EN, 0, 0, dcdc4_ranges, 2,
 291                            0, 0, TPS65218_REG_SEQ4, TPS65218_SEQ4_DC4_SEQ_MASK),
 292         TPS65218_REGULATOR("DCDC5", "regulator-dcdc5", TPS65218_DCDC_5,
 293                            REGULATOR_VOLTAGE, tps65218_dcdc56_pmic_ops, 1, -1,
 294                            -1, TPS65218_REG_ENABLE1, TPS65218_ENABLE1_DC5_EN, 0,
 295                            0, NULL, 0, 0, 1000000, TPS65218_REG_SEQ5,
 296                            TPS65218_SEQ5_DC5_SEQ_MASK),
 297         TPS65218_REGULATOR("DCDC6", "regulator-dcdc6", TPS65218_DCDC_6,
 298                            REGULATOR_VOLTAGE, tps65218_dcdc56_pmic_ops, 1, -1,
 299                            -1, TPS65218_REG_ENABLE1, TPS65218_ENABLE1_DC6_EN, 0,
 300                            0, NULL, 0, 0, 1800000, TPS65218_REG_SEQ5,
 301                            TPS65218_SEQ5_DC6_SEQ_MASK),
 302         TPS65218_REGULATOR("LDO1", "regulator-ldo1", TPS65218_LDO_1,
 303                            REGULATOR_VOLTAGE, tps65218_ldo1_dcdc34_ops, 64,
 304                            TPS65218_REG_CONTROL_LDO1,
 305                            TPS65218_CONTROL_LDO1_MASK, TPS65218_REG_ENABLE2,
 306                            TPS65218_ENABLE2_LDO1_EN, 0, 0, ldo1_dcdc3_ranges,
 307                            2, 0, 0, TPS65218_REG_SEQ6,
 308                            TPS65218_SEQ6_LDO1_SEQ_MASK),
 309         TPS65218_REGULATOR("LS3", "regulator-ls3", TPS65218_LS_3,
 310                            REGULATOR_CURRENT, tps65218_ls3_ops, 0, 0, 0,
 311                            TPS65218_REG_ENABLE2, TPS65218_ENABLE2_LS3_EN,
 312                            TPS65218_REG_CONFIG2, TPS65218_CONFIG2_LS3ILIM_MASK,
 313                            NULL, 0, 0, 0, 0, 0),
 314 };
 315
 316 static int tps65218_regulator_probe(struct platform_device *pdev)
 317 {
 318         struct tps65218 *tps = dev_get_drvdata(pdev->dev.parent);
 319         struct regulator_dev *rdev;
 320         struct regulator_config config = { };
 321         int i, ret;
 322         unsigned int val;
 323
 324         config.dev = &pdev->dev;
 325         config.dev->of_node = tps->dev->of_node;
 326         config.driver_data = tps;
 327         config.regmap = tps->regmap;
 328
 329         /* Allocate memory for strobes */
 330         tps->strobes = devm_kzalloc(&pdev->dev, sizeof(u8) *
 331                                     TPS65218_NUM_REGULATOR, GFP_KERNEL);
 332
 333         for (i = 0; i < ARRAY_SIZE(regulators); i++) {
 334                 rdev = devm_regulator_register(&pdev->dev, &regulators[i],
 335                                                &config);
 336                 if (IS_ERR(rdev)) {
 337                         dev_err(tps->dev, "failed to register %s regulator\n",
 338                                 pdev->name);
 339                         return PTR_ERR(rdev);
 340                 }
 341
 342                 ret = regmap_read(tps->regmap, regulators[i].bypass_reg, &val);
 343                 if (ret)
 344                         return ret;
 345
 346                 tps->strobes[i] = val & regulators[i].bypass_mask;
 347         }
 348
 349         return 0;
 350 }
 351
 352 static const struct platform_device_id tps65218_regulator_id_table[] = {
 353         { "tps65218-regulator", },
 354         { /* sentinel */ }
 355 };
 356 MODULE_DEVICE_TABLE(platform, tps65218_regulator_id_table);
 357
 358 static struct platform_driver tps65218_regulator_driver = {
 359         .driver = {
 360                 .name = "tps65218-pmic",
 361         },
 362         .probe = tps65218_regulator_probe,
 363         .id_table = tps65218_regulator_id_table,
 364 };
 365
 366 module_platform_driver(tps65218_regulator_driver);
 367
 368 MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
 369 MODULE_DESCRIPTION("TPS65218 voltage regulator driver");
 370 MODULE_ALIAS("platform:tps65218-pmic");
 371 MODULE_LICENSE("GPL v2");