drivers/regulator/tps65090-regulator.c

   1 /*
   2  * Regulator driver for tps65090 power management chip.
   3  *
   4  * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
   5
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms and conditions of the GNU General Public License,
   8  * version 2, as published by the Free Software Foundation.
   9
  10  * This program is distributed in the hope it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  * more details.
  14
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/init.h>
  21 #include <linux/gpio.h>
  22 #include <linux/of_gpio.h>
  23 #include <linux/slab.h>
  24 #include <linux/err.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/regulator/driver.h>
  27 #include <linux/regulator/machine.h>
  28 #include <linux/regulator/of_regulator.h>
  29 #include <linux/mfd/tps65090.h>
  30
  31 #define CTRL_WT_BIT             2 /* Regulator wait time 0 bit */
  32
  33 #define MAX_OVERCURRENT_WAIT    3 /* Overcurrent wait must be <= this */
  34
  35 /**
  36  * struct tps65090_regulator - Per-regulator data for a tps65090 regulator
  37  *
  38  * @dev: Pointer to our device.
  39  * @desc: The struct regulator_desc for the regulator.
  40  * @rdev: The struct regulator_dev for the regulator.
  41  * @overcurrent_wait_valid: True if overcurrent_wait is valid.
  42  * @overcurrent_wait: For FETs, the value to put in the WTFET bitfield.
  43  */
  44
  45 struct tps65090_regulator {
  46         struct device           *dev;
  47         struct regulator_desc   *desc;
  48         struct regulator_dev    *rdev;
  49         bool                    overcurrent_wait_valid;
  50         int                     overcurrent_wait;
  51 };
  52
  53 static struct regulator_ops tps65090_ext_control_ops = {
  54 };
  55
  56 /**
  57  * tps65090_reg_set_overcurrent_wait - Setup overcurrent wait
  58  *
  59  * This will set the overcurrent wait time based on what's in the regulator
  60  * info.
  61  *
  62  * @ri:         Overall regulator data
  63  * @rdev:       Regulator device
  64  *
  65  * Return: 0 if no error, non-zero if there was an error writing the register.
  66  */
  67 static int tps65090_reg_set_overcurrent_wait(struct tps65090_regulator *ri,
  68                                              struct regulator_dev *rdev)
  69 {
  70         int ret;
  71
  72         ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
  73                                  MAX_OVERCURRENT_WAIT << CTRL_WT_BIT,
  74                                  ri->overcurrent_wait << CTRL_WT_BIT);
  75         if (ret) {
  76                 dev_err(&rdev->dev, "Error updating overcurrent wait %#x\n",
  77                         rdev->desc->enable_reg);
  78         }
  79
  80         return ret;
  81 }
  82
  83 static struct regulator_ops tps65090_reg_contol_ops = {
  84         .enable         = regulator_enable_regmap,
  85         .disable        = regulator_disable_regmap,
  86         .is_enabled     = regulator_is_enabled_regmap,
  87 };
  88
  89 static struct regulator_ops tps65090_ldo_ops = {
  90 };
  91
  92 #define tps65090_REG_DESC(_id, _sname, _en_reg, _ops)   \
  93 {                                                       \
  94         .name = "TPS65090_RAILS"#_id,                   \
  95         .supply_name = _sname,                          \
  96         .id = TPS65090_REGULATOR_##_id,                 \
  97         .ops = &_ops,                                   \
  98         .enable_reg = _en_reg,                          \
  99         .enable_mask = BIT(0),                          \
 100         .type = REGULATOR_VOLTAGE,                      \
 101         .owner = THIS_MODULE,                           \
 102 }
 103
 104 static struct regulator_desc tps65090_regulator_desc[] = {
 105         tps65090_REG_DESC(DCDC1, "vsys1",   0x0C, tps65090_reg_contol_ops),
 106         tps65090_REG_DESC(DCDC2, "vsys2",   0x0D, tps65090_reg_contol_ops),
 107         tps65090_REG_DESC(DCDC3, "vsys3",   0x0E, tps65090_reg_contol_ops),
 108         tps65090_REG_DESC(FET1,  "infet1",  0x0F, tps65090_reg_contol_ops),
 109         tps65090_REG_DESC(FET2,  "infet2",  0x10, tps65090_reg_contol_ops),
 110         tps65090_REG_DESC(FET3,  "infet3",  0x11, tps65090_reg_contol_ops),
 111         tps65090_REG_DESC(FET4,  "infet4",  0x12, tps65090_reg_contol_ops),
 112         tps65090_REG_DESC(FET5,  "infet5",  0x13, tps65090_reg_contol_ops),
 113         tps65090_REG_DESC(FET6,  "infet6",  0x14, tps65090_reg_contol_ops),
 114         tps65090_REG_DESC(FET7,  "infet7",  0x15, tps65090_reg_contol_ops),
 115         tps65090_REG_DESC(LDO1,  "vsys-l1", 0,    tps65090_ldo_ops),
 116         tps65090_REG_DESC(LDO2,  "vsys-l2", 0,    tps65090_ldo_ops),
 117 };
 118
 119 static inline bool is_dcdc(int id)
 120 {
 121         switch (id) {
 122         case TPS65090_REGULATOR_DCDC1:
 123         case TPS65090_REGULATOR_DCDC2:
 124         case TPS65090_REGULATOR_DCDC3:
 125                 return true;
 126         default:
 127                 return false;
 128         }
 129 }
 130
 131 static int tps65090_config_ext_control(
 132         struct tps65090_regulator *ri, bool enable)
 133 {
 134         int ret;
 135         struct device *parent = ri->dev->parent;
 136         unsigned int reg_en_reg = ri->desc->enable_reg;
 137
 138         if (enable)
 139                 ret = tps65090_set_bits(parent, reg_en_reg, 1);
 140         else
 141                 ret =  tps65090_clr_bits(parent, reg_en_reg, 1);
 142         if (ret < 0)
 143                 dev_err(ri->dev, "Error in updating reg 0x%x\n", reg_en_reg);
 144         return ret;
 145 }
 146
 147 static int tps65090_regulator_disable_ext_control(
 148                 struct tps65090_regulator *ri,
 149                 struct tps65090_regulator_plat_data *tps_pdata)
 150 {
 151         int ret = 0;
 152         struct device *parent = ri->dev->parent;
 153         unsigned int reg_en_reg = ri->desc->enable_reg;
 154
 155         /*
 156          * First enable output for internal control if require.
 157          * And then disable external control.
 158          */
 159         if (tps_pdata->reg_init_data->constraints.always_on ||
 160                         tps_pdata->reg_init_data->constraints.boot_on) {
 161                 ret =  tps65090_set_bits(parent, reg_en_reg, 0);
 162                 if (ret < 0) {
 163                         dev_err(ri->dev, "Error in set reg 0x%x\n", reg_en_reg);
 164                         return ret;
 165                 }
 166         }
 167         return tps65090_config_ext_control(ri, false);
 168 }
 169
 170 static void tps65090_configure_regulator_config(
 171                 struct tps65090_regulator_plat_data *tps_pdata,
 172                 struct regulator_config *config)
 173 {
 174         if (gpio_is_valid(tps_pdata->gpio)) {
 175                 int gpio_flag = GPIOF_OUT_INIT_LOW;
 176
 177                 if (tps_pdata->reg_init_data->constraints.always_on ||
 178                                 tps_pdata->reg_init_data->constraints.boot_on)
 179                         gpio_flag = GPIOF_OUT_INIT_HIGH;
 180
 181                 config->ena_gpio = tps_pdata->gpio;
 182                 config->ena_gpio_flags = gpio_flag;
 183         }
 184 }
 185
 186 #ifdef CONFIG_OF
 187 static struct of_regulator_match tps65090_matches[] = {
 188         { .name = "dcdc1", },
 189         { .name = "dcdc2", },
 190         { .name = "dcdc3", },
 191         { .name = "fet1",  },
 192         { .name = "fet2",  },
 193         { .name = "fet3",  },
 194         { .name = "fet4",  },
 195         { .name = "fet5",  },
 196         { .name = "fet6",  },
 197         { .name = "fet7",  },
 198         { .name = "ldo1",  },
 199         { .name = "ldo2",  },
 200 };
 201
 202 static struct tps65090_platform_data *tps65090_parse_dt_reg_data(
 203                 struct platform_device *pdev,
 204                 struct of_regulator_match **tps65090_reg_matches)
 205 {
 206         struct tps65090_platform_data *tps65090_pdata;
 207         struct device_node *np = pdev->dev.parent->of_node;
 208         struct device_node *regulators;
 209         int idx = 0, ret;
 210         struct tps65090_regulator_plat_data *reg_pdata;
 211
 212         tps65090_pdata = devm_kzalloc(&pdev->dev, sizeof(*tps65090_pdata),
 213                                 GFP_KERNEL);
 214         if (!tps65090_pdata)
 215                 return ERR_PTR(-ENOMEM);
 216
 217         reg_pdata = devm_kzalloc(&pdev->dev, TPS65090_REGULATOR_MAX *
 218                                 sizeof(*reg_pdata), GFP_KERNEL);
 219         if (!reg_pdata)
 220                 return ERR_PTR(-ENOMEM);
 221
 222         regulators = of_get_child_by_name(np, "regulators");
 223         if (!regulators) {
 224                 dev_err(&pdev->dev, "regulator node not found\n");
 225                 return ERR_PTR(-ENODEV);
 226         }
 227
 228         ret = of_regulator_match(&pdev->dev, regulators, tps65090_matches,
 229                         ARRAY_SIZE(tps65090_matches));
 230         of_node_put(regulators);
 231         if (ret < 0) {
 232                 dev_err(&pdev->dev,
 233                         "Error parsing regulator init data: %d\n", ret);
 234                 return ERR_PTR(ret);
 235         }
 236
 237         *tps65090_reg_matches = tps65090_matches;
 238         for (idx = 0; idx < ARRAY_SIZE(tps65090_matches); idx++) {
 239                 struct regulator_init_data *ri_data;
 240                 struct tps65090_regulator_plat_data *rpdata;
 241
 242                 rpdata = &reg_pdata[idx];
 243                 ri_data = tps65090_matches[idx].init_data;
 244                 if (!ri_data || !tps65090_matches[idx].of_node)
 245                         continue;
 246
 247                 rpdata->reg_init_data = ri_data;
 248                 rpdata->enable_ext_control = of_property_read_bool(
 249                                         tps65090_matches[idx].of_node,
 250                                         "ti,enable-ext-control");
 251                 if (rpdata->enable_ext_control)
 252                         rpdata->gpio = of_get_named_gpio(np,
 253                                         "dcdc-ext-control-gpios", 0);
 254
 255                 if (of_property_read_u32(tps65090_matches[idx].of_node,
 256                                          "ti,overcurrent-wait",
 257                                          &rpdata->overcurrent_wait) == 0)
 258                         rpdata->overcurrent_wait_valid = true;
 259
 260                 tps65090_pdata->reg_pdata[idx] = rpdata;
 261         }
 262         return tps65090_pdata;
 263 }
 264 #else
 265 static inline struct tps65090_platform_data *tps65090_parse_dt_reg_data(
 266                         struct platform_device *pdev,
 267                         struct of_regulator_match **tps65090_reg_matches)
 268 {
 269         *tps65090_reg_matches = NULL;
 270         return NULL;
 271 }
 272 #endif
 273
 274 static int tps65090_regulator_probe(struct platform_device *pdev)
 275 {
 276         struct tps65090 *tps65090_mfd = dev_get_drvdata(pdev->dev.parent);
 277         struct tps65090_regulator *ri = NULL;
 278         struct regulator_config config = { };
 279         struct regulator_dev *rdev;
 280         struct tps65090_regulator_plat_data *tps_pdata;
 281         struct tps65090_regulator *pmic;
 282         struct tps65090_platform_data *tps65090_pdata;
 283         struct of_regulator_match *tps65090_reg_matches = NULL;
 284         int num;
 285         int ret;
 286
 287         dev_dbg(&pdev->dev, "Probing regulator\n");
 288
 289         tps65090_pdata = dev_get_platdata(pdev->dev.parent);
 290         if (!tps65090_pdata && tps65090_mfd->dev->of_node)
 291                 tps65090_pdata = tps65090_parse_dt_reg_data(pdev,
 292                                         &tps65090_reg_matches);
 293         if (IS_ERR_OR_NULL(tps65090_pdata)) {
 294                 dev_err(&pdev->dev, "Platform data missing\n");
 295                 return tps65090_pdata ? PTR_ERR(tps65090_pdata) : -EINVAL;
 296         }
 297
 298         pmic = devm_kzalloc(&pdev->dev, TPS65090_REGULATOR_MAX * sizeof(*pmic),
 299                         GFP_KERNEL);
 300         if (!pmic)
 301                 return -ENOMEM;
 302
 303         for (num = 0; num < TPS65090_REGULATOR_MAX; num++) {
 304                 tps_pdata = tps65090_pdata->reg_pdata[num];
 305
 306                 ri = &pmic[num];
 307                 ri->dev = &pdev->dev;
 308                 ri->desc = &tps65090_regulator_desc[num];
 309                 ri->overcurrent_wait_valid = tps_pdata->overcurrent_wait_valid;
 310                 ri->overcurrent_wait = tps_pdata->overcurrent_wait;
 311
 312                 /*
 313                  * TPS5090 DCDC support the control from external digital input.
 314                  * Configure it as per platform data.
 315                  */
 316                 if (tps_pdata && is_dcdc(num) && tps_pdata->reg_init_data) {
 317                         if (tps_pdata->enable_ext_control) {
 318                                 tps65090_configure_regulator_config(
 319                                                 tps_pdata, &config);
 320                                 ri->desc->ops = &tps65090_ext_control_ops;
 321                         } else {
 322                                 ret = tps65090_regulator_disable_ext_control(
 323                                                 ri, tps_pdata);
 324                                 if (ret < 0) {
 325                                         dev_err(&pdev->dev,
 326                                                 "failed disable ext control\n");
 327                                         return ret;
 328                                 }
 329                         }
 330                 }
 331
 332                 config.dev = pdev->dev.parent;
 333                 config.driver_data = ri;
 334                 config.regmap = tps65090_mfd->rmap;
 335                 if (tps_pdata)
 336                         config.init_data = tps_pdata->reg_init_data;
 337                 else
 338                         config.init_data = NULL;
 339                 if (tps65090_reg_matches)
 340                         config.of_node = tps65090_reg_matches[num].of_node;
 341                 else
 342                         config.of_node = NULL;
 343
 344                 rdev = devm_regulator_register(&pdev->dev, ri->desc, &config);
 345                 if (IS_ERR(rdev)) {
 346                         dev_err(&pdev->dev, "failed to register regulator %s\n",
 347                                 ri->desc->name);
 348                         return PTR_ERR(rdev);
 349                 }
 350                 ri->rdev = rdev;
 351
 352                 if (ri->overcurrent_wait_valid) {
 353                         ret = tps65090_reg_set_overcurrent_wait(ri, rdev);
 354                         if (ret < 0)
 355                                 return ret;
 356                 }
 357
 358                 /* Enable external control if it is require */
 359                 if (tps_pdata && is_dcdc(num) && tps_pdata->reg_init_data &&
 360                                 tps_pdata->enable_ext_control) {
 361                         ret = tps65090_config_ext_control(ri, true);
 362                         if (ret < 0)
 363                                 return ret;
 364                 }
 365         }
 366
 367         platform_set_drvdata(pdev, pmic);
 368         return 0;
 369 }
 370
 371 static struct platform_driver tps65090_regulator_driver = {
 372         .driver = {
 373                 .name   = "tps65090-pmic",
 374                 .owner  = THIS_MODULE,
 375         },
 376         .probe          = tps65090_regulator_probe,
 377 };
 378
 379 static int __init tps65090_regulator_init(void)
 380 {
 381         return platform_driver_register(&tps65090_regulator_driver);
 382 }
 383 subsys_initcall(tps65090_regulator_init);
 384
 385 static void __exit tps65090_regulator_exit(void)
 386 {
 387         platform_driver_unregister(&tps65090_regulator_driver);
 388 }
 389 module_exit(tps65090_regulator_exit);
 390
 391 MODULE_DESCRIPTION("tps65090 regulator driver");
 392 MODULE_AUTHOR("Venu Byravarasu <vbyravarasu@nvidia.com>");
 393 MODULE_LICENSE("GPL v2");
 394 MODULE_ALIAS("platform:tps65090-pmic");