drivers/mfd/sec-core.c

   1 /*
   2  * sec-core.c
   3  *
   4  * Copyright (c) 2012 Samsung Electronics Co., Ltd
   5  *              http://www.samsung.com
   6  *
   7  *  This program is free software; you can redistribute  it and/or modify it
   8  *  under  the terms of  the GNU General  Public License as published by the
   9  *  Free Software Foundation;  either version 2 of the  License, or (at your
  10  *  option) any later version.
  11  *
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/moduleparam.h>
  16 #include <linux/init.h>
  17 #include <linux/err.h>
  18 #include <linux/slab.h>
  19 #include <linux/i2c.h>
  20 #include <linux/of.h>
  21 #include <linux/of_irq.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/pm_runtime.h>
  24 #include <linux/mutex.h>
  25 #include <linux/mfd/core.h>
  26 #include <linux/mfd/samsung/core.h>
  27 #include <linux/mfd/samsung/irq.h>
  28 #include <linux/mfd/samsung/s2mpa01.h>
  29 #include <linux/mfd/samsung/s2mps11.h>
  30 #include <linux/mfd/samsung/s2mps13.h>
  31 #include <linux/mfd/samsung/s2mps14.h>
  32 #include <linux/mfd/samsung/s2mps15.h>
  33 #include <linux/mfd/samsung/s2mpu02.h>
  34 #include <linux/mfd/samsung/s5m8763.h>
  35 #include <linux/mfd/samsung/s5m8767.h>
  36 #include <linux/regmap.h>
  37
  38 static const struct mfd_cell s5m8751_devs[] = {
  39         {
  40                 .name = "s5m8751-pmic",
  41         }, {
  42                 .name = "s5m-charger",
  43         }, {
  44                 .name = "s5m8751-codec",
  45         },
  46 };
  47
  48 static const struct mfd_cell s5m8763_devs[] = {
  49         {
  50                 .name = "s5m8763-pmic",
  51         }, {
  52                 .name = "s5m-rtc",
  53         }, {
  54                 .name = "s5m-charger",
  55         },
  56 };
  57
  58 static const struct mfd_cell s5m8767_devs[] = {
  59         {
  60                 .name = "s5m8767-pmic",
  61         }, {
  62                 .name = "s5m-rtc",
  63         }, {
  64                 .name = "s5m8767-clk",
  65                 .of_compatible = "samsung,s5m8767-clk",
  66         }
  67 };
  68
  69 static const struct mfd_cell s2mps11_devs[] = {
  70         {
  71                 .name = "s2mps11-regulator",
  72         }, {
  73                 .name = "s2mps14-rtc",
  74         }, {
  75                 .name = "s2mps11-clk",
  76                 .of_compatible = "samsung,s2mps11-clk",
  77         }
  78 };
  79
  80 static const struct mfd_cell s2mps13_devs[] = {
  81         { .name = "s2mps13-regulator", },
  82         { .name = "s2mps13-rtc", },
  83         {
  84                 .name = "s2mps13-clk",
  85                 .of_compatible = "samsung,s2mps13-clk",
  86         },
  87 };
  88
  89 static const struct mfd_cell s2mps14_devs[] = {
  90         {
  91                 .name = "s2mps14-regulator",
  92         }, {
  93                 .name = "s2mps14-rtc",
  94         }, {
  95                 .name = "s2mps14-clk",
  96                 .of_compatible = "samsung,s2mps14-clk",
  97         }
  98 };
  99
 100 static const struct mfd_cell s2mps15_devs[] = {
 101         {
 102                 .name = "s2mps15-regulator",
 103         }, {
 104                 .name = "s2mps15-rtc",
 105         }, {
 106                 .name = "s2mps13-clk",
 107                 .of_compatible = "samsung,s2mps13-clk",
 108         },
 109 };
 110
 111 static const struct mfd_cell s2mpa01_devs[] = {
 112         {
 113                 .name = "s2mpa01-pmic",
 114         },
 115 };
 116
 117 static const struct mfd_cell s2mpu02_devs[] = {
 118         {
 119                 .name = "s2mpu02-regulator",
 120         },
 121 };
 122
 123 #ifdef CONFIG_OF
 124 static const struct of_device_id sec_dt_match[] = {
 125         {       .compatible = "samsung,s5m8767-pmic",
 126                 .data = (void *)S5M8767X,
 127         }, {
 128                 .compatible = "samsung,s2mps11-pmic",
 129                 .data = (void *)S2MPS11X,
 130         }, {
 131                 .compatible = "samsung,s2mps13-pmic",
 132                 .data = (void *)S2MPS13X,
 133         }, {
 134                 .compatible = "samsung,s2mps14-pmic",
 135                 .data = (void *)S2MPS14X,
 136         }, {
 137                 .compatible = "samsung,s2mps15-pmic",
 138                 .data = (void *)S2MPS15X,
 139         }, {
 140                 .compatible = "samsung,s2mpa01-pmic",
 141                 .data = (void *)S2MPA01,
 142         }, {
 143                 .compatible = "samsung,s2mpu02-pmic",
 144                 .data = (void *)S2MPU02,
 145         }, {
 146                 /* Sentinel */
 147         },
 148 };
 149 #endif
 150
 151 static bool s2mpa01_volatile(struct device *dev, unsigned int reg)
 152 {
 153         switch (reg) {
 154         case S2MPA01_REG_INT1M:
 155         case S2MPA01_REG_INT2M:
 156         case S2MPA01_REG_INT3M:
 157                 return false;
 158         default:
 159                 return true;
 160         }
 161 }
 162
 163 static bool s2mps11_volatile(struct device *dev, unsigned int reg)
 164 {
 165         switch (reg) {
 166         case S2MPS11_REG_INT1M:
 167         case S2MPS11_REG_INT2M:
 168         case S2MPS11_REG_INT3M:
 169                 return false;
 170         default:
 171                 return true;
 172         }
 173 }
 174
 175 static bool s2mpu02_volatile(struct device *dev, unsigned int reg)
 176 {
 177         switch (reg) {
 178         case S2MPU02_REG_INT1M:
 179         case S2MPU02_REG_INT2M:
 180         case S2MPU02_REG_INT3M:
 181                 return false;
 182         default:
 183                 return true;
 184         }
 185 }
 186
 187 static bool s5m8763_volatile(struct device *dev, unsigned int reg)
 188 {
 189         switch (reg) {
 190         case S5M8763_REG_IRQM1:
 191         case S5M8763_REG_IRQM2:
 192         case S5M8763_REG_IRQM3:
 193         case S5M8763_REG_IRQM4:
 194                 return false;
 195         default:
 196                 return true;
 197         }
 198 }
 199
 200 static const struct regmap_config sec_regmap_config = {
 201         .reg_bits = 8,
 202         .val_bits = 8,
 203 };
 204
 205 static const struct regmap_config s2mpa01_regmap_config = {
 206         .reg_bits = 8,
 207         .val_bits = 8,
 208
 209         .max_register = S2MPA01_REG_LDO_OVCB4,
 210         .volatile_reg = s2mpa01_volatile,
 211         .cache_type = REGCACHE_FLAT,
 212 };
 213
 214 static const struct regmap_config s2mps11_regmap_config = {
 215         .reg_bits = 8,
 216         .val_bits = 8,
 217
 218         .max_register = S2MPS11_REG_L38CTRL,
 219         .volatile_reg = s2mps11_volatile,
 220         .cache_type = REGCACHE_FLAT,
 221 };
 222
 223 static const struct regmap_config s2mps13_regmap_config = {
 224         .reg_bits = 8,
 225         .val_bits = 8,
 226
 227         .max_register = S2MPS13_REG_LDODSCH5,
 228         .volatile_reg = s2mps11_volatile,
 229         .cache_type = REGCACHE_FLAT,
 230 };
 231
 232 static const struct regmap_config s2mps14_regmap_config = {
 233         .reg_bits = 8,
 234         .val_bits = 8,
 235
 236         .max_register = S2MPS14_REG_LDODSCH3,
 237         .volatile_reg = s2mps11_volatile,
 238         .cache_type = REGCACHE_FLAT,
 239 };
 240
 241 static const struct regmap_config s2mps15_regmap_config = {
 242         .reg_bits = 8,
 243         .val_bits = 8,
 244
 245         .max_register = S2MPS15_REG_LDODSCH4,
 246         .volatile_reg = s2mps11_volatile,
 247         .cache_type = REGCACHE_FLAT,
 248 };
 249
 250 static const struct regmap_config s2mpu02_regmap_config = {
 251         .reg_bits = 8,
 252         .val_bits = 8,
 253
 254         .max_register = S2MPU02_REG_DVSDATA,
 255         .volatile_reg = s2mpu02_volatile,
 256         .cache_type = REGCACHE_FLAT,
 257 };
 258
 259 static const struct regmap_config s5m8763_regmap_config = {
 260         .reg_bits = 8,
 261         .val_bits = 8,
 262
 263         .max_register = S5M8763_REG_LBCNFG2,
 264         .volatile_reg = s5m8763_volatile,
 265         .cache_type = REGCACHE_FLAT,
 266 };
 267
 268 static const struct regmap_config s5m8767_regmap_config = {
 269         .reg_bits = 8,
 270         .val_bits = 8,
 271
 272         .max_register = S5M8767_REG_LDO28CTRL,
 273         .volatile_reg = s2mps11_volatile,
 274         .cache_type = REGCACHE_FLAT,
 275 };
 276
 277 static void sec_pmic_dump_rev(struct sec_pmic_dev *sec_pmic)
 278 {
 279         unsigned int val;
 280
 281         /* For each device type, the REG_ID is always the first register */
 282         if (!regmap_read(sec_pmic->regmap_pmic, S2MPS11_REG_ID, &val))
 283                 dev_dbg(sec_pmic->dev, "Revision: 0x%x\n", val);
 284 }
 285
 286 static void sec_pmic_configure(struct sec_pmic_dev *sec_pmic)
 287 {
 288         int err;
 289
 290         if (sec_pmic->device_type != S2MPS13X)
 291                 return;
 292
 293         if (sec_pmic->pdata->disable_wrstbi) {
 294                 /*
 295                  * If WRSTBI pin is pulled down this feature must be disabled
 296                  * because each Suspend to RAM will trigger buck voltage reset
 297                  * to default values.
 298                  */
 299                 err = regmap_update_bits(sec_pmic->regmap_pmic,
 300                                          S2MPS13_REG_WRSTBI,
 301                                          S2MPS13_REG_WRSTBI_MASK, 0x0);
 302                 if (err)
 303                         dev_warn(sec_pmic->dev,
 304                                  "Cannot initialize WRSTBI config: %d\n",
 305                                  err);
 306         }
 307 }
 308
 309 #ifdef CONFIG_OF
 310 /*
 311  * Only the common platform data elements for s5m8767 are parsed here from the
 312  * device tree. Other sub-modules of s5m8767 such as pmic, rtc , charger and
 313  * others have to parse their own platform data elements from device tree.
 314  *
 315  * The s5m8767 platform data structure is instantiated here and the drivers for
 316  * the sub-modules need not instantiate another instance while parsing their
 317  * platform data.
 318  */
 319 static struct sec_platform_data *sec_pmic_i2c_parse_dt_pdata(
 320                                         struct device *dev)
 321 {
 322         struct sec_platform_data *pd;
 323
 324         pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
 325         if (!pd)
 326                 return ERR_PTR(-ENOMEM);
 327
 328         /*
 329          * ToDo: the 'wakeup' member in the platform data is more of a linux
 330          * specfic information. Hence, there is no binding for that yet and
 331          * not parsed here.
 332          */
 333
 334         pd->manual_poweroff = of_property_read_bool(dev->of_node,
 335                                                 "samsung,s2mps11-acokb-ground");
 336         pd->disable_wrstbi = of_property_read_bool(dev->of_node,
 337                                                 "samsung,s2mps11-wrstbi-ground");
 338         return pd;
 339 }
 340 #else
 341 static struct sec_platform_data *sec_pmic_i2c_parse_dt_pdata(
 342                                         struct device *dev)
 343 {
 344         return NULL;
 345 }
 346 #endif
 347
 348 static inline unsigned long sec_i2c_get_driver_data(struct i2c_client *i2c,
 349                                                 const struct i2c_device_id *id)
 350 {
 351 #ifdef CONFIG_OF
 352         if (i2c->dev.of_node) {
 353                 const struct of_device_id *match;
 354
 355                 match = of_match_node(sec_dt_match, i2c->dev.of_node);
 356                 return (unsigned long)match->data;
 357         }
 358 #endif
 359         return id->driver_data;
 360 }
 361
 362 static int sec_pmic_probe(struct i2c_client *i2c,
 363                             const struct i2c_device_id *id)
 364 {
 365         struct sec_platform_data *pdata = dev_get_platdata(&i2c->dev);
 366         const struct regmap_config *regmap;
 367         const struct mfd_cell *sec_devs;
 368         struct sec_pmic_dev *sec_pmic;
 369         unsigned long device_type;
 370         int ret, num_sec_devs;
 371
 372         sec_pmic = devm_kzalloc(&i2c->dev, sizeof(struct sec_pmic_dev),
 373                                 GFP_KERNEL);
 374         if (sec_pmic == NULL)
 375                 return -ENOMEM;
 376
 377         i2c_set_clientdata(i2c, sec_pmic);
 378         sec_pmic->dev = &i2c->dev;
 379         sec_pmic->i2c = i2c;
 380         sec_pmic->irq = i2c->irq;
 381         device_type = sec_i2c_get_driver_data(i2c, id);
 382
 383         if (sec_pmic->dev->of_node) {
 384                 pdata = sec_pmic_i2c_parse_dt_pdata(sec_pmic->dev);
 385                 if (IS_ERR(pdata)) {
 386                         ret = PTR_ERR(pdata);
 387                         return ret;
 388                 }
 389                 pdata->device_type = device_type;
 390         }
 391         if (pdata) {
 392                 sec_pmic->device_type = pdata->device_type;
 393                 sec_pmic->irq_base = pdata->irq_base;
 394                 sec_pmic->wakeup = pdata->wakeup;
 395                 sec_pmic->pdata = pdata;
 396         }
 397
 398         switch (sec_pmic->device_type) {
 399         case S2MPA01:
 400                 regmap = &s2mpa01_regmap_config;
 401                 break;
 402         case S2MPS11X:
 403                 regmap = &s2mps11_regmap_config;
 404                 break;
 405         case S2MPS13X:
 406                 regmap = &s2mps13_regmap_config;
 407                 break;
 408         case S2MPS14X:
 409                 regmap = &s2mps14_regmap_config;
 410                 break;
 411         case S2MPS15X:
 412                 regmap = &s2mps15_regmap_config;
 413                 break;
 414         case S5M8763X:
 415                 regmap = &s5m8763_regmap_config;
 416                 break;
 417         case S5M8767X:
 418                 regmap = &s5m8767_regmap_config;
 419                 break;
 420         case S2MPU02:
 421                 regmap = &s2mpu02_regmap_config;
 422                 break;
 423         default:
 424                 regmap = &sec_regmap_config;
 425                 break;
 426         }
 427
 428         sec_pmic->regmap_pmic = devm_regmap_init_i2c(i2c, regmap);
 429         if (IS_ERR(sec_pmic->regmap_pmic)) {
 430                 ret = PTR_ERR(sec_pmic->regmap_pmic);
 431                 dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
 432                         ret);
 433                 return ret;
 434         }
 435
 436         if (pdata && pdata->cfg_pmic_irq)
 437                 pdata->cfg_pmic_irq();
 438
 439         sec_irq_init(sec_pmic);
 440
 441         pm_runtime_set_active(sec_pmic->dev);
 442
 443         switch (sec_pmic->device_type) {
 444         case S5M8751X:
 445                 sec_devs = s5m8751_devs;
 446                 num_sec_devs = ARRAY_SIZE(s5m8751_devs);
 447                 break;
 448         case S5M8763X:
 449                 sec_devs = s5m8763_devs;
 450                 num_sec_devs = ARRAY_SIZE(s5m8763_devs);
 451                 break;
 452         case S5M8767X:
 453                 sec_devs = s5m8767_devs;
 454                 num_sec_devs = ARRAY_SIZE(s5m8767_devs);
 455                 break;
 456         case S2MPA01:
 457                 sec_devs = s2mpa01_devs;
 458                 num_sec_devs = ARRAY_SIZE(s2mpa01_devs);
 459                 break;
 460         case S2MPS11X:
 461                 sec_devs = s2mps11_devs;
 462                 num_sec_devs = ARRAY_SIZE(s2mps11_devs);
 463                 break;
 464         case S2MPS13X:
 465                 sec_devs = s2mps13_devs;
 466                 num_sec_devs = ARRAY_SIZE(s2mps13_devs);
 467                 break;
 468         case S2MPS14X:
 469                 sec_devs = s2mps14_devs;
 470                 num_sec_devs = ARRAY_SIZE(s2mps14_devs);
 471                 break;
 472         case S2MPS15X:
 473                 sec_devs = s2mps15_devs;
 474                 num_sec_devs = ARRAY_SIZE(s2mps15_devs);
 475                 break;
 476         case S2MPU02:
 477                 sec_devs = s2mpu02_devs;
 478                 num_sec_devs = ARRAY_SIZE(s2mpu02_devs);
 479                 break;
 480         default:
 481                 /* If this happens the probe function is problem */
 482                 BUG();
 483         }
 484         ret = devm_mfd_add_devices(sec_pmic->dev, -1, sec_devs, num_sec_devs,
 485                                    NULL, 0, NULL);
 486         if (ret)
 487                 return ret;
 488
 489         device_init_wakeup(sec_pmic->dev, sec_pmic->wakeup);
 490         sec_pmic_configure(sec_pmic);
 491         sec_pmic_dump_rev(sec_pmic);
 492
 493         return ret;
 494 }
 495
 496 static void sec_pmic_shutdown(struct i2c_client *i2c)
 497 {
 498         struct sec_pmic_dev *sec_pmic = i2c_get_clientdata(i2c);
 499         unsigned int reg, mask;
 500
 501         if (!sec_pmic->pdata->manual_poweroff)
 502                 return;
 503
 504         switch (sec_pmic->device_type) {
 505         case S2MPS11X:
 506                 reg = S2MPS11_REG_CTRL1;
 507                 mask = S2MPS11_CTRL1_PWRHOLD_MASK;
 508                 break;
 509         default:
 510                 /*
 511                  * Currently only one board with S2MPS11 needs this, so just
 512                  * ignore the rest.
 513                  */
 514                 dev_warn(sec_pmic->dev,
 515                         "Unsupported device %lu for manual power off\n",
 516                         sec_pmic->device_type);
 517                 return;
 518         }
 519
 520         regmap_update_bits(sec_pmic->regmap_pmic, reg, mask, 0);
 521 }
 522
 523 #ifdef CONFIG_PM_SLEEP
 524 static int sec_pmic_suspend(struct device *dev)
 525 {
 526         struct i2c_client *i2c = to_i2c_client(dev);
 527         struct sec_pmic_dev *sec_pmic = i2c_get_clientdata(i2c);
 528
 529         if (device_may_wakeup(dev))
 530                 enable_irq_wake(sec_pmic->irq);
 531         /*
 532          * PMIC IRQ must be disabled during suspend for RTC alarm
 533          * to work properly.
 534          * When device is woken up from suspend, an
 535          * interrupt occurs before resuming I2C bus controller.
 536          * The interrupt is handled by regmap_irq_thread which tries
 537          * to read RTC registers. This read fails (I2C is still
 538          * suspended) and RTC Alarm interrupt is disabled.
 539          */
 540         disable_irq(sec_pmic->irq);
 541
 542         return 0;
 543 }
 544
 545 static int sec_pmic_resume(struct device *dev)
 546 {
 547         struct i2c_client *i2c = to_i2c_client(dev);
 548         struct sec_pmic_dev *sec_pmic = i2c_get_clientdata(i2c);
 549
 550         if (device_may_wakeup(dev))
 551                 disable_irq_wake(sec_pmic->irq);
 552         enable_irq(sec_pmic->irq);
 553
 554         return 0;
 555 }
 556 #endif /* CONFIG_PM_SLEEP */
 557
 558 static SIMPLE_DEV_PM_OPS(sec_pmic_pm_ops, sec_pmic_suspend, sec_pmic_resume);
 559
 560 static const struct i2c_device_id sec_pmic_id[] = {
 561         { "sec_pmic", 0 },
 562         { }
 563 };
 564 MODULE_DEVICE_TABLE(i2c, sec_pmic_id);
 565
 566 static struct i2c_driver sec_pmic_driver = {
 567         .driver = {
 568                    .name = "sec_pmic",
 569                    .pm = &sec_pmic_pm_ops,
 570                    .of_match_table = of_match_ptr(sec_dt_match),
 571         },
 572         .probe = sec_pmic_probe,
 573         .shutdown = sec_pmic_shutdown,
 574         .id_table = sec_pmic_id,
 575 };
 576
 577 static int __init sec_pmic_init(void)
 578 {
 579         return i2c_add_driver(&sec_pmic_driver);
 580 }
 581
 582 subsys_initcall(sec_pmic_init);
 583
 584 static void __exit sec_pmic_exit(void)
 585 {
 586         i2c_del_driver(&sec_pmic_driver);
 587 }
 588 module_exit(sec_pmic_exit);
 589
 590 MODULE_AUTHOR("Sangbeom Kim <sbkim73@samsung.com>");
 591 MODULE_DESCRIPTION("Core support for the S5M MFD");
 592 MODULE_LICENSE("GPL");