drivers/mfd/sec-core.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 //
   3 // Copyright (c) 2012 Samsung Electronics Co., Ltd
   4 //              http://www.samsung.com
   5
   6 #include <linux/module.h>
   7 #include <linux/moduleparam.h>
   8 #include <linux/init.h>
   9 #include <linux/err.h>
  10 #include <linux/slab.h>
  11 #include <linux/i2c.h>
  12 #include <linux/of.h>
  13 #include <linux/of_irq.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/pm_runtime.h>
  16 #include <linux/mutex.h>
  17 #include <linux/mfd/core.h>
  18 #include <linux/mfd/samsung/core.h>
  19 #include <linux/mfd/samsung/irq.h>
  20 #include <linux/mfd/samsung/s2mpa01.h>
  21 #include <linux/mfd/samsung/s2mps11.h>
  22 #include <linux/mfd/samsung/s2mps13.h>
  23 #include <linux/mfd/samsung/s2mps14.h>
  24 #include <linux/mfd/samsung/s2mps15.h>
  25 #include <linux/mfd/samsung/s2mpu02.h>
  26 #include <linux/mfd/samsung/s5m8763.h>
  27 #include <linux/mfd/samsung/s5m8767.h>
  28 #include <linux/regmap.h>
  29
  30 static const struct mfd_cell s5m8751_devs[] = {
  31         {
  32                 .name = "s5m8751-pmic",
  33         }, {
  34                 .name = "s5m-charger",
  35         }, {
  36                 .name = "s5m8751-codec",
  37         },
  38 };
  39
  40 static const struct mfd_cell s5m8763_devs[] = {
  41         {
  42                 .name = "s5m8763-pmic",
  43         }, {
  44                 .name = "s5m-rtc",
  45         }, {
  46                 .name = "s5m-charger",
  47         },
  48 };
  49
  50 static const struct mfd_cell s5m8767_devs[] = {
  51         {
  52                 .name = "s5m8767-pmic",
  53         }, {
  54                 .name = "s5m-rtc",
  55         }, {
  56                 .name = "s5m8767-clk",
  57                 .of_compatible = "samsung,s5m8767-clk",
  58         }
  59 };
  60
  61 static const struct mfd_cell s2mps11_devs[] = {
  62         {
  63                 .name = "s2mps11-regulator",
  64         }, {
  65                 .name = "s2mps14-rtc",
  66         }, {
  67                 .name = "s2mps11-clk",
  68                 .of_compatible = "samsung,s2mps11-clk",
  69         }
  70 };
  71
  72 static const struct mfd_cell s2mps13_devs[] = {
  73         { .name = "s2mps13-regulator", },
  74         { .name = "s2mps13-rtc", },
  75         {
  76                 .name = "s2mps13-clk",
  77                 .of_compatible = "samsung,s2mps13-clk",
  78         },
  79 };
  80
  81 static const struct mfd_cell s2mps14_devs[] = {
  82         {
  83                 .name = "s2mps14-regulator",
  84         }, {
  85                 .name = "s2mps14-rtc",
  86         }, {
  87                 .name = "s2mps14-clk",
  88                 .of_compatible = "samsung,s2mps14-clk",
  89         }
  90 };
  91
  92 static const struct mfd_cell s2mps15_devs[] = {
  93         {
  94                 .name = "s2mps15-regulator",
  95         }, {
  96                 .name = "s2mps15-rtc",
  97         }, {
  98                 .name = "s2mps13-clk",
  99                 .of_compatible = "samsung,s2mps13-clk",
 100         },
 101 };
 102
 103 static const struct mfd_cell s2mpa01_devs[] = {
 104         {
 105                 .name = "s2mpa01-pmic",
 106         },
 107 };
 108
 109 static const struct mfd_cell s2mpu02_devs[] = {
 110         {
 111                 .name = "s2mpu02-regulator",
 112         },
 113 };
 114
 115 #ifdef CONFIG_OF
 116 static const struct of_device_id sec_dt_match[] = {
 117         {
 118                 .compatible = "samsung,s5m8767-pmic",
 119                 .data = (void *)S5M8767X,
 120         }, {
 121                 .compatible = "samsung,s2mps11-pmic",
 122                 .data = (void *)S2MPS11X,
 123         }, {
 124                 .compatible = "samsung,s2mps13-pmic",
 125                 .data = (void *)S2MPS13X,
 126         }, {
 127                 .compatible = "samsung,s2mps14-pmic",
 128                 .data = (void *)S2MPS14X,
 129         }, {
 130                 .compatible = "samsung,s2mps15-pmic",
 131                 .data = (void *)S2MPS15X,
 132         }, {
 133                 .compatible = "samsung,s2mpa01-pmic",
 134                 .data = (void *)S2MPA01,
 135         }, {
 136                 .compatible = "samsung,s2mpu02-pmic",
 137                 .data = (void *)S2MPU02,
 138         }, {
 139                 /* Sentinel */
 140         },
 141 };
 142 MODULE_DEVICE_TABLE(of, sec_dt_match);
 143 #endif
 144
 145 static bool s2mpa01_volatile(struct device *dev, unsigned int reg)
 146 {
 147         switch (reg) {
 148         case S2MPA01_REG_INT1M:
 149         case S2MPA01_REG_INT2M:
 150         case S2MPA01_REG_INT3M:
 151                 return false;
 152         default:
 153                 return true;
 154         }
 155 }
 156
 157 static bool s2mps11_volatile(struct device *dev, unsigned int reg)
 158 {
 159         switch (reg) {
 160         case S2MPS11_REG_INT1M:
 161         case S2MPS11_REG_INT2M:
 162         case S2MPS11_REG_INT3M:
 163                 return false;
 164         default:
 165                 return true;
 166         }
 167 }
 168
 169 static bool s2mpu02_volatile(struct device *dev, unsigned int reg)
 170 {
 171         switch (reg) {
 172         case S2MPU02_REG_INT1M:
 173         case S2MPU02_REG_INT2M:
 174         case S2MPU02_REG_INT3M:
 175                 return false;
 176         default:
 177                 return true;
 178         }
 179 }
 180
 181 static bool s5m8763_volatile(struct device *dev, unsigned int reg)
 182 {
 183         switch (reg) {
 184         case S5M8763_REG_IRQM1:
 185         case S5M8763_REG_IRQM2:
 186         case S5M8763_REG_IRQM3:
 187         case S5M8763_REG_IRQM4:
 188                 return false;
 189         default:
 190                 return true;
 191         }
 192 }
 193
 194 static const struct regmap_config sec_regmap_config = {
 195         .reg_bits = 8,
 196         .val_bits = 8,
 197 };
 198
 199 static const struct regmap_config s2mpa01_regmap_config = {
 200         .reg_bits = 8,
 201         .val_bits = 8,
 202
 203         .max_register = S2MPA01_REG_LDO_OVCB4,
 204         .volatile_reg = s2mpa01_volatile,
 205         .cache_type = REGCACHE_FLAT,
 206 };
 207
 208 static const struct regmap_config s2mps11_regmap_config = {
 209         .reg_bits = 8,
 210         .val_bits = 8,
 211
 212         .max_register = S2MPS11_REG_L38CTRL,
 213         .volatile_reg = s2mps11_volatile,
 214         .cache_type = REGCACHE_FLAT,
 215 };
 216
 217 static const struct regmap_config s2mps13_regmap_config = {
 218         .reg_bits = 8,
 219         .val_bits = 8,
 220
 221         .max_register = S2MPS13_REG_LDODSCH5,
 222         .volatile_reg = s2mps11_volatile,
 223         .cache_type = REGCACHE_FLAT,
 224 };
 225
 226 static const struct regmap_config s2mps14_regmap_config = {
 227         .reg_bits = 8,
 228         .val_bits = 8,
 229
 230         .max_register = S2MPS14_REG_LDODSCH3,
 231         .volatile_reg = s2mps11_volatile,
 232         .cache_type = REGCACHE_FLAT,
 233 };
 234
 235 static const struct regmap_config s2mps15_regmap_config = {
 236         .reg_bits = 8,
 237         .val_bits = 8,
 238
 239         .max_register = S2MPS15_REG_LDODSCH4,
 240         .volatile_reg = s2mps11_volatile,
 241         .cache_type = REGCACHE_FLAT,
 242 };
 243
 244 static const struct regmap_config s2mpu02_regmap_config = {
 245         .reg_bits = 8,
 246         .val_bits = 8,
 247
 248         .max_register = S2MPU02_REG_DVSDATA,
 249         .volatile_reg = s2mpu02_volatile,
 250         .cache_type = REGCACHE_FLAT,
 251 };
 252
 253 static const struct regmap_config s5m8763_regmap_config = {
 254         .reg_bits = 8,
 255         .val_bits = 8,
 256
 257         .max_register = S5M8763_REG_LBCNFG2,
 258         .volatile_reg = s5m8763_volatile,
 259         .cache_type = REGCACHE_FLAT,
 260 };
 261
 262 static const struct regmap_config s5m8767_regmap_config = {
 263         .reg_bits = 8,
 264         .val_bits = 8,
 265
 266         .max_register = S5M8767_REG_LDO28CTRL,
 267         .volatile_reg = s2mps11_volatile,
 268         .cache_type = REGCACHE_FLAT,
 269 };
 270
 271 static void sec_pmic_dump_rev(struct sec_pmic_dev *sec_pmic)
 272 {
 273         unsigned int val;
 274
 275         /* For each device type, the REG_ID is always the first register */
 276         if (!regmap_read(sec_pmic->regmap_pmic, S2MPS11_REG_ID, &val))
 277                 dev_dbg(sec_pmic->dev, "Revision: 0x%x\n", val);
 278 }
 279
 280 static void sec_pmic_configure(struct sec_pmic_dev *sec_pmic)
 281 {
 282         int err;
 283
 284         if (sec_pmic->device_type != S2MPS13X)
 285                 return;
 286
 287         if (sec_pmic->pdata->disable_wrstbi) {
 288                 /*
 289                  * If WRSTBI pin is pulled down this feature must be disabled
 290                  * because each Suspend to RAM will trigger buck voltage reset
 291                  * to default values.
 292                  */
 293                 err = regmap_update_bits(sec_pmic->regmap_pmic,
 294                                          S2MPS13_REG_WRSTBI,
 295                                          S2MPS13_REG_WRSTBI_MASK, 0x0);
 296                 if (err)
 297                         dev_warn(sec_pmic->dev,
 298                                  "Cannot initialize WRSTBI config: %d\n",
 299                                  err);
 300         }
 301 }
 302
 303 #ifdef CONFIG_OF
 304 /*
 305  * Only the common platform data elements for s5m8767 are parsed here from the
 306  * device tree. Other sub-modules of s5m8767 such as pmic, rtc , charger and
 307  * others have to parse their own platform data elements from device tree.
 308  *
 309  * The s5m8767 platform data structure is instantiated here and the drivers for
 310  * the sub-modules need not instantiate another instance while parsing their
 311  * platform data.
 312  */
 313 static struct sec_platform_data *
 314 sec_pmic_i2c_parse_dt_pdata(struct device *dev)
 315 {
 316         struct sec_platform_data *pd;
 317
 318         pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
 319         if (!pd)
 320                 return ERR_PTR(-ENOMEM);
 321
 322         /*
 323          * ToDo: the 'wakeup' member in the platform data is more of a linux
 324          * specfic information. Hence, there is no binding for that yet and
 325          * not parsed here.
 326          */
 327
 328         pd->manual_poweroff = of_property_read_bool(dev->of_node,
 329                                                 "samsung,s2mps11-acokb-ground");
 330         pd->disable_wrstbi = of_property_read_bool(dev->of_node,
 331                                                 "samsung,s2mps11-wrstbi-ground");
 332         return pd;
 333 }
 334 #else
 335 static struct sec_platform_data *
 336 sec_pmic_i2c_parse_dt_pdata(struct device *dev)
 337 {
 338         return NULL;
 339 }
 340 #endif
 341
 342 static inline unsigned long sec_i2c_get_driver_data(struct i2c_client *i2c,
 343                                                 const struct i2c_device_id *id)
 344 {
 345 #ifdef CONFIG_OF
 346         if (i2c->dev.of_node) {
 347                 const struct of_device_id *match;
 348
 349                 match = of_match_node(sec_dt_match, i2c->dev.of_node);
 350                 return (unsigned long)match->data;
 351         }
 352 #endif
 353         return id->driver_data;
 354 }
 355
 356 static int sec_pmic_probe(struct i2c_client *i2c,
 357                             const struct i2c_device_id *id)
 358 {
 359         struct sec_platform_data *pdata = dev_get_platdata(&i2c->dev);
 360         const struct regmap_config *regmap;
 361         const struct mfd_cell *sec_devs;
 362         struct sec_pmic_dev *sec_pmic;
 363         unsigned long device_type;
 364         int ret, num_sec_devs;
 365
 366         sec_pmic = devm_kzalloc(&i2c->dev, sizeof(struct sec_pmic_dev),
 367                                 GFP_KERNEL);
 368         if (sec_pmic == NULL)
 369                 return -ENOMEM;
 370
 371         i2c_set_clientdata(i2c, sec_pmic);
 372         sec_pmic->dev = &i2c->dev;
 373         sec_pmic->i2c = i2c;
 374         sec_pmic->irq = i2c->irq;
 375         device_type = sec_i2c_get_driver_data(i2c, id);
 376
 377         if (sec_pmic->dev->of_node) {
 378                 pdata = sec_pmic_i2c_parse_dt_pdata(sec_pmic->dev);
 379                 if (IS_ERR(pdata)) {
 380                         ret = PTR_ERR(pdata);
 381                         return ret;
 382                 }
 383                 pdata->device_type = device_type;
 384         }
 385         if (pdata) {
 386                 sec_pmic->device_type = pdata->device_type;
 387                 sec_pmic->irq_base = pdata->irq_base;
 388                 sec_pmic->wakeup = pdata->wakeup;
 389                 sec_pmic->pdata = pdata;
 390         }
 391
 392         switch (sec_pmic->device_type) {
 393         case S2MPA01:
 394                 regmap = &s2mpa01_regmap_config;
 395                 break;
 396         case S2MPS11X:
 397                 regmap = &s2mps11_regmap_config;
 398                 break;
 399         case S2MPS13X:
 400                 regmap = &s2mps13_regmap_config;
 401                 break;
 402         case S2MPS14X:
 403                 regmap = &s2mps14_regmap_config;
 404                 break;
 405         case S2MPS15X:
 406                 regmap = &s2mps15_regmap_config;
 407                 break;
 408         case S5M8763X:
 409                 regmap = &s5m8763_regmap_config;
 410                 break;
 411         case S5M8767X:
 412                 regmap = &s5m8767_regmap_config;
 413                 break;
 414         case S2MPU02:
 415                 regmap = &s2mpu02_regmap_config;
 416                 break;
 417         default:
 418                 regmap = &sec_regmap_config;
 419                 break;
 420         }
 421
 422         sec_pmic->regmap_pmic = devm_regmap_init_i2c(i2c, regmap);
 423         if (IS_ERR(sec_pmic->regmap_pmic)) {
 424                 ret = PTR_ERR(sec_pmic->regmap_pmic);
 425                 dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
 426                         ret);
 427                 return ret;
 428         }
 429
 430         if (pdata && pdata->cfg_pmic_irq)
 431                 pdata->cfg_pmic_irq();
 432
 433         sec_irq_init(sec_pmic);
 434
 435         pm_runtime_set_active(sec_pmic->dev);
 436
 437         switch (sec_pmic->device_type) {
 438         case S5M8751X:
 439                 sec_devs = s5m8751_devs;
 440                 num_sec_devs = ARRAY_SIZE(s5m8751_devs);
 441                 break;
 442         case S5M8763X:
 443                 sec_devs = s5m8763_devs;
 444                 num_sec_devs = ARRAY_SIZE(s5m8763_devs);
 445                 break;
 446         case S5M8767X:
 447                 sec_devs = s5m8767_devs;
 448                 num_sec_devs = ARRAY_SIZE(s5m8767_devs);
 449                 break;
 450         case S2MPA01:
 451                 sec_devs = s2mpa01_devs;
 452                 num_sec_devs = ARRAY_SIZE(s2mpa01_devs);
 453                 break;
 454         case S2MPS11X:
 455                 sec_devs = s2mps11_devs;
 456                 num_sec_devs = ARRAY_SIZE(s2mps11_devs);
 457                 break;
 458         case S2MPS13X:
 459                 sec_devs = s2mps13_devs;
 460                 num_sec_devs = ARRAY_SIZE(s2mps13_devs);
 461                 break;
 462         case S2MPS14X:
 463                 sec_devs = s2mps14_devs;
 464                 num_sec_devs = ARRAY_SIZE(s2mps14_devs);
 465                 break;
 466         case S2MPS15X:
 467                 sec_devs = s2mps15_devs;
 468                 num_sec_devs = ARRAY_SIZE(s2mps15_devs);
 469                 break;
 470         case S2MPU02:
 471                 sec_devs = s2mpu02_devs;
 472                 num_sec_devs = ARRAY_SIZE(s2mpu02_devs);
 473                 break;
 474         default:
 475                 dev_err(&i2c->dev, "Unsupported device type (%lu)\n",
 476                         sec_pmic->device_type);
 477                 return -ENODEV;
 478         }
 479         ret = devm_mfd_add_devices(sec_pmic->dev, -1, sec_devs, num_sec_devs,
 480                                    NULL, 0, NULL);
 481         if (ret)
 482                 return ret;
 483
 484         device_init_wakeup(sec_pmic->dev, sec_pmic->wakeup);
 485         sec_pmic_configure(sec_pmic);
 486         sec_pmic_dump_rev(sec_pmic);
 487
 488         return ret;
 489 }
 490
 491 static void sec_pmic_shutdown(struct i2c_client *i2c)
 492 {
 493         struct sec_pmic_dev *sec_pmic = i2c_get_clientdata(i2c);
 494         unsigned int reg, mask;
 495
 496         if (!sec_pmic->pdata->manual_poweroff)
 497                 return;
 498
 499         switch (sec_pmic->device_type) {
 500         case S2MPS11X:
 501                 reg = S2MPS11_REG_CTRL1;
 502                 mask = S2MPS11_CTRL1_PWRHOLD_MASK;
 503                 break;
 504         default:
 505                 /*
 506                  * Currently only one board with S2MPS11 needs this, so just
 507                  * ignore the rest.
 508                  */
 509                 dev_warn(sec_pmic->dev,
 510                         "Unsupported device %lu for manual power off\n",
 511                         sec_pmic->device_type);
 512                 return;
 513         }
 514
 515         regmap_update_bits(sec_pmic->regmap_pmic, reg, mask, 0);
 516 }
 517
 518 #ifdef CONFIG_PM_SLEEP
 519 static int sec_pmic_suspend(struct device *dev)
 520 {
 521         struct i2c_client *i2c = to_i2c_client(dev);
 522         struct sec_pmic_dev *sec_pmic = i2c_get_clientdata(i2c);
 523
 524         if (device_may_wakeup(dev))
 525                 enable_irq_wake(sec_pmic->irq);
 526         /*
 527          * PMIC IRQ must be disabled during suspend for RTC alarm
 528          * to work properly.
 529          * When device is woken up from suspend, an
 530          * interrupt occurs before resuming I2C bus controller.
 531          * The interrupt is handled by regmap_irq_thread which tries
 532          * to read RTC registers. This read fails (I2C is still
 533          * suspended) and RTC Alarm interrupt is disabled.
 534          */
 535         disable_irq(sec_pmic->irq);
 536
 537         return 0;
 538 }
 539
 540 static int sec_pmic_resume(struct device *dev)
 541 {
 542         struct i2c_client *i2c = to_i2c_client(dev);
 543         struct sec_pmic_dev *sec_pmic = i2c_get_clientdata(i2c);
 544
 545         if (device_may_wakeup(dev))
 546                 disable_irq_wake(sec_pmic->irq);
 547         enable_irq(sec_pmic->irq);
 548
 549         return 0;
 550 }
 551 #endif /* CONFIG_PM_SLEEP */
 552
 553 static SIMPLE_DEV_PM_OPS(sec_pmic_pm_ops, sec_pmic_suspend, sec_pmic_resume);
 554
 555 static const struct i2c_device_id sec_pmic_id[] = {
 556         { "sec_pmic", 0 },
 557         { }
 558 };
 559 MODULE_DEVICE_TABLE(i2c, sec_pmic_id);
 560
 561 static struct i2c_driver sec_pmic_driver = {
 562         .driver = {
 563                    .name = "sec_pmic",
 564                    .pm = &sec_pmic_pm_ops,
 565                    .of_match_table = of_match_ptr(sec_dt_match),
 566         },
 567         .probe = sec_pmic_probe,
 568         .shutdown = sec_pmic_shutdown,
 569         .id_table = sec_pmic_id,
 570 };
 571
 572 static int __init sec_pmic_init(void)
 573 {
 574         return i2c_add_driver(&sec_pmic_driver);
 575 }
 576
 577 subsys_initcall(sec_pmic_init);
 578
 579 static void __exit sec_pmic_exit(void)
 580 {
 581         i2c_del_driver(&sec_pmic_driver);
 582 }
 583 module_exit(sec_pmic_exit);
 584
 585 MODULE_AUTHOR("Sangbeom Kim <sbkim73@samsung.com>");
 586 MODULE_DESCRIPTION("Core support for the S5M MFD");
 587 MODULE_LICENSE("GPL");