drivers/regulator/tps65217-regulator.c

   1 /*
   2  * tps65217-regulator.c
   3  *
   4  * Regulator driver for TPS65217 PMIC
   5  *
   6  * Copyright (C) 2011 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 as
  10  * published by the Free Software Foundation version 2.
  11  *
  12  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  13  * kind, whether express or implied; without even the implied warranty
  14  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License 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
  25 #include <linux/regulator/of_regulator.h>
  26 #include <linux/regulator/driver.h>
  27 #include <linux/regulator/machine.h>
  28 #include <linux/mfd/tps65217.h>
  29
  30 #define TPS65217_REGULATOR(_name, _id, _ops, _n, _vr, _vm, _em, _t) \
  31         {                                               \
  32                 .name           = _name,                \
  33                 .id             = _id,                  \
  34                 .ops            = &_ops,                \
  35                 .n_voltages     = _n,                   \
  36                 .type           = REGULATOR_VOLTAGE,    \
  37                 .owner          = THIS_MODULE,          \
  38                 .vsel_reg       = _vr,                  \
  39                 .vsel_mask      = _vm,                  \
  40                 .enable_reg     = TPS65217_REG_ENABLE,  \
  41                 .enable_mask    = _em,                  \
  42                 .volt_table     = _t,                   \
  43         }                                               \
  44
  45 #define TPS65217_INFO(_nm, _min, _max, _f1, _f2)        \
  46         {                                               \
  47                 .name           = _nm,                  \
  48                 .min_uV         = _min,                 \
  49                 .max_uV         = _max,                 \
  50                 .vsel_to_uv     = _f1,                  \
  51                 .uv_to_vsel     = _f2,                  \
  52         }
  53
  54 static const unsigned int LDO1_VSEL_table[] = {
  55         1000000, 1100000, 1200000, 1250000,
  56         1300000, 1350000, 1400000, 1500000,
  57         1600000, 1800000, 2500000, 2750000,
  58         2800000, 3000000, 3100000, 3300000,
  59 };
  60
  61 static int tps65217_vsel_to_uv1(unsigned int vsel)
  62 {
  63         int uV = 0;
  64
  65         if (vsel > 63)
  66                 return -EINVAL;
  67
  68         if (vsel <= 24)
  69                 uV = vsel * 25000 + 900000;
  70         else if (vsel <= 52)
  71                 uV = (vsel - 24) * 50000 + 1500000;
  72         else if (vsel < 56)
  73                 uV = (vsel - 52) * 100000 + 2900000;
  74         else
  75                 uV = 3300000;
  76
  77         return uV;
  78 }
  79
  80 static int tps65217_uv_to_vsel1(int uV, unsigned int *vsel)
  81 {
  82         if (uV < 0 || uV > 3300000)
  83                 return -EINVAL;
  84
  85         if (uV <= 1500000)
  86                 *vsel = DIV_ROUND_UP(uV - 900000, 25000);
  87         else if (uV <= 2900000)
  88                 *vsel = 24 + DIV_ROUND_UP(uV - 1500000, 50000);
  89         else if (uV < 3300000)
  90                 *vsel = 52 + DIV_ROUND_UP(uV - 2900000, 100000);
  91         else
  92                 *vsel = 56;
  93
  94         return 0;
  95 }
  96
  97 static int tps65217_vsel_to_uv2(unsigned int vsel)
  98 {
  99         int uV = 0;
 100
 101         if (vsel > 31)
 102                 return -EINVAL;
 103
 104         if (vsel <= 8)
 105                 uV = vsel * 50000 + 1500000;
 106         else if (vsel <= 13)
 107                 uV = (vsel - 8) * 100000 + 1900000;
 108         else
 109                 uV = (vsel - 13) * 50000 + 2400000;
 110
 111         return uV;
 112 }
 113
 114 static int tps65217_uv_to_vsel2(int uV, unsigned int *vsel)
 115 {
 116         if (uV < 0 || uV > 3300000)
 117                 return -EINVAL;
 118
 119         if (uV <= 1900000)
 120                 *vsel = DIV_ROUND_UP(uV - 1500000, 50000);
 121         else if (uV <= 2400000)
 122                 *vsel = 8 + DIV_ROUND_UP(uV - 1900000, 100000);
 123         else
 124                 *vsel = 13 + DIV_ROUND_UP(uV - 2400000, 50000);
 125
 126         return 0;
 127 }
 128
 129 static struct tps_info tps65217_pmic_regs[] = {
 130         TPS65217_INFO("DCDC1", 900000, 1800000, tps65217_vsel_to_uv1,
 131                         tps65217_uv_to_vsel1),
 132         TPS65217_INFO("DCDC2", 900000, 3300000, tps65217_vsel_to_uv1,
 133                         tps65217_uv_to_vsel1),
 134         TPS65217_INFO("DCDC3", 900000, 1500000, tps65217_vsel_to_uv1,
 135                         tps65217_uv_to_vsel1),
 136         TPS65217_INFO("LDO1", 1000000, 3300000, NULL, NULL),
 137         TPS65217_INFO("LDO2", 900000, 3300000, tps65217_vsel_to_uv1,
 138                         tps65217_uv_to_vsel1),
 139         TPS65217_INFO("LDO3", 1800000, 3300000, tps65217_vsel_to_uv2,
 140                         tps65217_uv_to_vsel2),
 141         TPS65217_INFO("LDO4", 1800000, 3300000, tps65217_vsel_to_uv2,
 142                         tps65217_uv_to_vsel2),
 143 };
 144
 145 static int tps65217_pmic_enable(struct regulator_dev *dev)
 146 {
 147         struct tps65217 *tps = rdev_get_drvdata(dev);
 148         unsigned int rid = rdev_get_id(dev);
 149
 150         if (rid < TPS65217_DCDC_1 || rid > TPS65217_LDO_4)
 151                 return -EINVAL;
 152
 153         /* Enable the regulator and password protection is level 1 */
 154         return tps65217_set_bits(tps, TPS65217_REG_ENABLE,
 155                                  dev->desc->enable_mask, dev->desc->enable_mask,
 156                                  TPS65217_PROTECT_L1);
 157 }
 158
 159 static int tps65217_pmic_disable(struct regulator_dev *dev)
 160 {
 161         struct tps65217 *tps = rdev_get_drvdata(dev);
 162         unsigned int rid = rdev_get_id(dev);
 163
 164         if (rid < TPS65217_DCDC_1 || rid > TPS65217_LDO_4)
 165                 return -EINVAL;
 166
 167         /* Disable the regulator and password protection is level 1 */
 168         return tps65217_clear_bits(tps, TPS65217_REG_ENABLE,
 169                                    dev->desc->enable_mask, TPS65217_PROTECT_L1);
 170 }
 171
 172 static int tps65217_pmic_set_voltage_sel(struct regulator_dev *dev,
 173                                          unsigned selector)
 174 {
 175         int ret;
 176         struct tps65217 *tps = rdev_get_drvdata(dev);
 177         unsigned int rid = rdev_get_id(dev);
 178
 179         /* Set the voltage based on vsel value and write protect level is 2 */
 180         ret = tps65217_set_bits(tps, dev->desc->vsel_reg, dev->desc->vsel_mask,
 181                                 selector, TPS65217_PROTECT_L2);
 182
 183         /* Set GO bit for DCDCx to initiate voltage transistion */
 184         switch (rid) {
 185         case TPS65217_DCDC_1 ... TPS65217_DCDC_3:
 186                 ret = tps65217_set_bits(tps, TPS65217_REG_DEFSLEW,
 187                                        TPS65217_DEFSLEW_GO, TPS65217_DEFSLEW_GO,
 188                                        TPS65217_PROTECT_L2);
 189                 break;
 190         }
 191
 192         return ret;
 193 }
 194
 195 static int tps65217_pmic_map_voltage(struct regulator_dev *dev,
 196                                      int min_uV, int max_uV)
 197 {
 198
 199         struct tps65217 *tps = rdev_get_drvdata(dev);
 200         unsigned int sel, rid = rdev_get_id(dev);
 201         int ret;
 202
 203         /* LDO1 uses regulator_map_voltage_iterate() */
 204         if (rid == TPS65217_LDO_1)
 205                 return -EINVAL;
 206
 207         if (rid < TPS65217_DCDC_1 || rid > TPS65217_LDO_4)
 208                 return -EINVAL;
 209
 210         if (min_uV < tps->info[rid]->min_uV)
 211                 min_uV = tps->info[rid]->min_uV;
 212
 213         if (max_uV < tps->info[rid]->min_uV || min_uV > tps->info[rid]->max_uV)
 214                 return -EINVAL;
 215
 216         ret = tps->info[rid]->uv_to_vsel(min_uV, &sel);
 217         if (ret)
 218                 return ret;
 219
 220         return sel;
 221 }
 222
 223 static int tps65217_pmic_list_voltage(struct regulator_dev *dev,
 224                                         unsigned selector)
 225 {
 226         struct tps65217 *tps = rdev_get_drvdata(dev);
 227         unsigned int rid = rdev_get_id(dev);
 228
 229         if (rid < TPS65217_DCDC_1 || rid > TPS65217_LDO_4)
 230                 return -EINVAL;
 231
 232         if (selector >= dev->desc->n_voltages)
 233                 return -EINVAL;
 234
 235         return tps->info[rid]->vsel_to_uv(selector);
 236 }
 237
 238 /* Operations permitted on DCDCx, LDO2, LDO3 and LDO4 */
 239 static struct regulator_ops tps65217_pmic_ops = {
 240         .is_enabled             = regulator_is_enabled_regmap,
 241         .enable                 = tps65217_pmic_enable,
 242         .disable                = tps65217_pmic_disable,
 243         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 244         .set_voltage_sel        = tps65217_pmic_set_voltage_sel,
 245         .list_voltage           = tps65217_pmic_list_voltage,
 246         .map_voltage            = tps65217_pmic_map_voltage,
 247 };
 248
 249 /* Operations permitted on LDO1 */
 250 static struct regulator_ops tps65217_pmic_ldo1_ops = {
 251         .is_enabled             = regulator_is_enabled_regmap,
 252         .enable                 = tps65217_pmic_enable,
 253         .disable                = tps65217_pmic_disable,
 254         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 255         .set_voltage_sel        = tps65217_pmic_set_voltage_sel,
 256         .list_voltage           = regulator_list_voltage_table,
 257 };
 258
 259 static const struct regulator_desc regulators[] = {
 260         TPS65217_REGULATOR("DCDC1", TPS65217_DCDC_1, tps65217_pmic_ops, 64,
 261                            TPS65217_REG_DEFDCDC1, TPS65217_DEFDCDCX_DCDC_MASK,
 262                            TPS65217_ENABLE_DC1_EN, NULL),
 263         TPS65217_REGULATOR("DCDC2", TPS65217_DCDC_2, tps65217_pmic_ops, 64,
 264                            TPS65217_REG_DEFDCDC2, TPS65217_DEFDCDCX_DCDC_MASK,
 265                            TPS65217_ENABLE_DC2_EN, NULL),
 266         TPS65217_REGULATOR("DCDC3", TPS65217_DCDC_3, tps65217_pmic_ops, 64,
 267                            TPS65217_REG_DEFDCDC3, TPS65217_DEFDCDCX_DCDC_MASK,
 268                            TPS65217_ENABLE_DC3_EN, NULL),
 269         TPS65217_REGULATOR("LDO1", TPS65217_LDO_1, tps65217_pmic_ldo1_ops, 16,
 270                            TPS65217_REG_DEFLDO1, TPS65217_DEFLDO1_LDO1_MASK,
 271                            TPS65217_ENABLE_LDO1_EN, LDO1_VSEL_table),
 272         TPS65217_REGULATOR("LDO2", TPS65217_LDO_2, tps65217_pmic_ops, 64,
 273                            TPS65217_REG_DEFLDO2, TPS65217_DEFLDO2_LDO2_MASK,
 274                            TPS65217_ENABLE_LDO2_EN, NULL),
 275         TPS65217_REGULATOR("LDO3", TPS65217_LDO_3, tps65217_pmic_ops, 32,
 276                            TPS65217_REG_DEFLS1, TPS65217_DEFLDO3_LDO3_MASK,
 277                            TPS65217_ENABLE_LS1_EN | TPS65217_DEFLDO3_LDO3_EN,
 278                            NULL),
 279         TPS65217_REGULATOR("LDO4", TPS65217_LDO_4, tps65217_pmic_ops, 32,
 280                            TPS65217_REG_DEFLS2, TPS65217_DEFLDO4_LDO4_MASK,
 281                            TPS65217_ENABLE_LS2_EN | TPS65217_DEFLDO4_LDO4_EN,
 282                            NULL),
 283 };
 284
 285 #ifdef CONFIG_OF
 286 static struct of_regulator_match reg_matches[] = {
 287         { .name = "dcdc1", .driver_data = (void *)TPS65217_DCDC_1 },
 288         { .name = "dcdc2", .driver_data = (void *)TPS65217_DCDC_2 },
 289         { .name = "dcdc3", .driver_data = (void *)TPS65217_DCDC_3 },
 290         { .name = "ldo1", .driver_data = (void *)TPS65217_LDO_1 },
 291         { .name = "ldo2", .driver_data = (void *)TPS65217_LDO_2 },
 292         { .name = "ldo3", .driver_data = (void *)TPS65217_LDO_3 },
 293         { .name = "ldo4", .driver_data = (void *)TPS65217_LDO_4 },
 294 };
 295
 296 static struct tps65217_board *tps65217_parse_dt(struct platform_device *pdev)
 297 {
 298         struct tps65217 *tps = dev_get_drvdata(pdev->dev.parent);
 299         struct device_node *node = tps->dev->of_node;
 300         struct tps65217_board *pdata;
 301         struct device_node *regs;
 302         int i, count;
 303
 304         regs = of_find_node_by_name(node, "regulators");
 305         if (!regs)
 306                 return NULL;
 307
 308         count = of_regulator_match(pdev->dev.parent, regs,
 309                                 reg_matches, TPS65217_NUM_REGULATOR);
 310         of_node_put(regs);
 311         if ((count < 0) || (count > TPS65217_NUM_REGULATOR))
 312                 return NULL;
 313
 314         pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
 315         if (!pdata)
 316                 return NULL;
 317
 318         for (i = 0; i < count; i++) {
 319                 if (!reg_matches[i].init_data || !reg_matches[i].of_node)
 320                         continue;
 321
 322                 pdata->tps65217_init_data[i] = reg_matches[i].init_data;
 323                 pdata->of_node[i] = reg_matches[i].of_node;
 324         }
 325
 326         return pdata;
 327 }
 328 #else
 329 static struct tps65217_board *tps65217_parse_dt(struct platform_device *pdev)
 330 {
 331         return NULL;
 332 }
 333 #endif
 334
 335 static int tps65217_regulator_probe(struct platform_device *pdev)
 336 {
 337         struct tps65217 *tps = dev_get_drvdata(pdev->dev.parent);
 338         struct tps65217_board *pdata = dev_get_platdata(tps->dev);
 339         struct regulator_init_data *reg_data;
 340         struct regulator_dev *rdev;
 341         struct regulator_config config = { };
 342         int i, ret;
 343
 344         if (tps->dev->of_node)
 345                 pdata = tps65217_parse_dt(pdev);
 346
 347         if (!pdata) {
 348                 dev_err(&pdev->dev, "Platform data not found\n");
 349                 return -EINVAL;
 350         }
 351
 352         if (tps65217_chip_id(tps) != TPS65217) {
 353                 dev_err(&pdev->dev, "Invalid tps chip version\n");
 354                 return -ENODEV;
 355         }
 356
 357         platform_set_drvdata(pdev, tps);
 358
 359         for (i = 0; i < TPS65217_NUM_REGULATOR; i++) {
 360
 361                 reg_data = pdata->tps65217_init_data[i];
 362
 363                 /*
 364                  * Regulator API handles empty constraints but not NULL
 365                  * constraints
 366                  */
 367                 if (!reg_data)
 368                         continue;
 369
 370                 /* Register the regulators */
 371                 tps->info[i] = &tps65217_pmic_regs[i];
 372
 373                 config.dev = tps->dev;
 374                 config.init_data = reg_data;
 375                 config.driver_data = tps;
 376                 config.regmap = tps->regmap;
 377                 if (tps->dev->of_node)
 378                         config.of_node = pdata->of_node[i];
 379
 380                 rdev = regulator_register(&regulators[i], &config);
 381                 if (IS_ERR(rdev)) {
 382                         dev_err(tps->dev, "failed to register %s regulator\n",
 383                                 pdev->name);
 384                         ret = PTR_ERR(rdev);
 385                         goto err_unregister_regulator;
 386                 }
 387
 388                 /* Save regulator for cleanup */
 389                 tps->rdev[i] = rdev;
 390         }
 391         return 0;
 392
 393 err_unregister_regulator:
 394         while (--i >= 0)
 395                 regulator_unregister(tps->rdev[i]);
 396
 397         return ret;
 398 }
 399
 400 static int tps65217_regulator_remove(struct platform_device *pdev)
 401 {
 402         struct tps65217 *tps = platform_get_drvdata(pdev);
 403         unsigned int i;
 404
 405         for (i = 0; i < TPS65217_NUM_REGULATOR; i++)
 406                 regulator_unregister(tps->rdev[i]);
 407
 408         platform_set_drvdata(pdev, NULL);
 409
 410         return 0;
 411 }
 412
 413 static struct platform_driver tps65217_regulator_driver = {
 414         .driver = {
 415                 .name = "tps65217-pmic",
 416         },
 417         .probe = tps65217_regulator_probe,
 418         .remove = tps65217_regulator_remove,
 419 };
 420
 421 static int __init tps65217_regulator_init(void)
 422 {
 423         return platform_driver_register(&tps65217_regulator_driver);
 424 }
 425 subsys_initcall(tps65217_regulator_init);
 426
 427 static void __exit tps65217_regulator_exit(void)
 428 {
 429         platform_driver_unregister(&tps65217_regulator_driver);
 430 }
 431 module_exit(tps65217_regulator_exit);
 432
 433 MODULE_AUTHOR("AnilKumar Ch <anilkumar@ti.com>");
 434 MODULE_DESCRIPTION("TPS65217 voltage regulator driver");
 435 MODULE_ALIAS("platform:tps65217-pmic");
 436 MODULE_LICENSE("GPL v2");