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_device.h>
  14 #include <linux/of_irq.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/pm_runtime.h>
  17 #include <linux/mutex.h>
  18 #include <linux/mfd/core.h>
  19 #include <linux/mfd/samsung/core.h>
  20 #include <linux/mfd/samsung/irq.h>
  21 #include <linux/mfd/samsung/s2mpa01.h>
  22 #include <linux/mfd/samsung/s2mps11.h>
  23 #include <linux/mfd/samsung/s2mps13.h>
  24 #include <linux/mfd/samsung/s2mps14.h>
  25 #include <linux/mfd/samsung/s2mps15.h>
  26 #include <linux/mfd/samsung/s2mpu02.h>
  27 #include <linux/mfd/samsung/s5m8767.h>
  28 #include <linux/regmap.h>
  29
  30 static const struct mfd_cell s5m8767_devs[] = {
  31         { .name = "s5m8767-pmic", },
  32         { .name = "s5m-rtc", },
  33         {
  34                 .name = "s5m8767-clk",
  35                 .of_compatible = "samsung,s5m8767-clk",
  36         },
  37 };
  38
  39 static const struct mfd_cell s2mps11_devs[] = {
  40         { .name = "s2mps11-regulator", },
  41         { .name = "s2mps14-rtc", },
  42         {
  43                 .name = "s2mps11-clk",
  44                 .of_compatible = "samsung,s2mps11-clk",
  45         },
  46 };
  47
  48 static const struct mfd_cell s2mps13_devs[] = {
  49         { .name = "s2mps13-regulator", },
  50         { .name = "s2mps13-rtc", },
  51         {
  52                 .name = "s2mps13-clk",
  53                 .of_compatible = "samsung,s2mps13-clk",
  54         },
  55 };
  56
  57 static const struct mfd_cell s2mps14_devs[] = {
  58         { .name = "s2mps14-regulator", },
  59         { .name = "s2mps14-rtc", },
  60         {
  61                 .name = "s2mps14-clk",
  62                 .of_compatible = "samsung,s2mps14-clk",
  63         },
  64 };
  65
  66 static const struct mfd_cell s2mps15_devs[] = {
  67         { .name = "s2mps15-regulator", },
  68         { .name = "s2mps15-rtc", },
  69         {
  70                 .name = "s2mps13-clk",
  71                 .of_compatible = "samsung,s2mps13-clk",
  72         },
  73 };
  74
  75 static const struct mfd_cell s2mpa01_devs[] = {
  76         { .name = "s2mpa01-pmic", },
  77         { .name = "s2mps14-rtc", },
  78 };
  79
  80 static const struct mfd_cell s2mpu02_devs[] = {
  81         { .name = "s2mpu02-regulator", },
  82 };
  83
  84 static const struct of_device_id sec_dt_match[] = {
  85         {
  86                 .compatible = "samsung,s5m8767-pmic",
  87                 .data = (void *)S5M8767X,
  88         }, {
  89                 .compatible = "samsung,s2mps11-pmic",
  90                 .data = (void *)S2MPS11X,
  91         }, {
  92                 .compatible = "samsung,s2mps13-pmic",
  93                 .data = (void *)S2MPS13X,
  94         }, {
  95                 .compatible = "samsung,s2mps14-pmic",
  96                 .data = (void *)S2MPS14X,
  97         }, {
  98                 .compatible = "samsung,s2mps15-pmic",
  99                 .data = (void *)S2MPS15X,
 100         }, {
 101                 .compatible = "samsung,s2mpa01-pmic",
 102                 .data = (void *)S2MPA01,
 103         }, {
 104                 .compatible = "samsung,s2mpu02-pmic",
 105                 .data = (void *)S2MPU02,
 106         }, {
 107                 /* Sentinel */
 108         },
 109 };
 110 MODULE_DEVICE_TABLE(of, sec_dt_match);
 111
 112 static bool s2mpa01_volatile(struct device *dev, unsigned int reg)
 113 {
 114         switch (reg) {
 115         case S2MPA01_REG_INT1M:
 116         case S2MPA01_REG_INT2M:
 117         case S2MPA01_REG_INT3M:
 118                 return false;
 119         default:
 120                 return true;
 121         }
 122 }
 123
 124 static bool s2mps11_volatile(struct device *dev, unsigned int reg)
 125 {
 126         switch (reg) {
 127         case S2MPS11_REG_INT1M:
 128         case S2MPS11_REG_INT2M:
 129         case S2MPS11_REG_INT3M:
 130                 return false;
 131         default:
 132                 return true;
 133         }
 134 }
 135
 136 static bool s2mpu02_volatile(struct device *dev, unsigned int reg)
 137 {
 138         switch (reg) {
 139         case S2MPU02_REG_INT1M:
 140         case S2MPU02_REG_INT2M:
 141         case S2MPU02_REG_INT3M:
 142                 return false;
 143         default:
 144                 return true;
 145         }
 146 }
 147
 148 static const struct regmap_config sec_regmap_config = {
 149         .reg_bits = 8,
 150         .val_bits = 8,
 151 };
 152
 153 static const struct regmap_config s2mpa01_regmap_config = {
 154         .reg_bits = 8,
 155         .val_bits = 8,
 156
 157         .max_register = S2MPA01_REG_LDO_OVCB4,
 158         .volatile_reg = s2mpa01_volatile,
 159         .cache_type = REGCACHE_FLAT,
 160 };
 161
 162 static const struct regmap_config s2mps11_regmap_config = {
 163         .reg_bits = 8,
 164         .val_bits = 8,
 165
 166         .max_register = S2MPS11_REG_L38CTRL,
 167         .volatile_reg = s2mps11_volatile,
 168         .cache_type = REGCACHE_FLAT,
 169 };
 170
 171 static const struct regmap_config s2mps13_regmap_config = {
 172         .reg_bits = 8,
 173         .val_bits = 8,
 174
 175         .max_register = S2MPS13_REG_LDODSCH5,
 176         .volatile_reg = s2mps11_volatile,
 177         .cache_type = REGCACHE_FLAT,
 178 };
 179
 180 static const struct regmap_config s2mps14_regmap_config = {
 181         .reg_bits = 8,
 182         .val_bits = 8,
 183
 184         .max_register = S2MPS14_REG_LDODSCH3,
 185         .volatile_reg = s2mps11_volatile,
 186         .cache_type = REGCACHE_FLAT,
 187 };
 188
 189 static const struct regmap_config s2mps15_regmap_config = {
 190         .reg_bits = 8,
 191         .val_bits = 8,
 192
 193         .max_register = S2MPS15_REG_LDODSCH4,
 194         .volatile_reg = s2mps11_volatile,
 195         .cache_type = REGCACHE_FLAT,
 196 };
 197
 198 static const struct regmap_config s2mpu02_regmap_config = {
 199         .reg_bits = 8,
 200         .val_bits = 8,
 201
 202         .max_register = S2MPU02_REG_DVSDATA,
 203         .volatile_reg = s2mpu02_volatile,
 204         .cache_type = REGCACHE_FLAT,
 205 };
 206
 207 static const struct regmap_config s5m8767_regmap_config = {
 208         .reg_bits = 8,
 209         .val_bits = 8,
 210
 211         .max_register = S5M8767_REG_LDO28CTRL,
 212         .volatile_reg = s2mps11_volatile,
 213         .cache_type = REGCACHE_FLAT,
 214 };
 215
 216 static void sec_pmic_dump_rev(struct sec_pmic_dev *sec_pmic)
 217 {
 218         unsigned int val;
 219
 220         /* For each device type, the REG_ID is always the first register */
 221         if (!regmap_read(sec_pmic->regmap_pmic, S2MPS11_REG_ID, &val))
 222                 dev_dbg(sec_pmic->dev, "Revision: 0x%x\n", val);
 223 }
 224
 225 static void sec_pmic_configure(struct sec_pmic_dev *sec_pmic)
 226 {
 227         int err;
 228
 229         if (sec_pmic->device_type != S2MPS13X)
 230                 return;
 231
 232         if (sec_pmic->pdata->disable_wrstbi) {
 233                 /*
 234                  * If WRSTBI pin is pulled down this feature must be disabled
 235                  * because each Suspend to RAM will trigger buck voltage reset
 236                  * to default values.
 237                  */
 238                 err = regmap_update_bits(sec_pmic->regmap_pmic,
 239                                          S2MPS13_REG_WRSTBI,
 240                                          S2MPS13_REG_WRSTBI_MASK, 0x0);
 241                 if (err)
 242                         dev_warn(sec_pmic->dev,
 243                                  "Cannot initialize WRSTBI config: %d\n",
 244                                  err);
 245         }
 246 }
 247
 248 /*
 249  * Only the common platform data elements for s5m8767 are parsed here from the
 250  * device tree. Other sub-modules of s5m8767 such as pmic, rtc , charger and
 251  * others have to parse their own platform data elements from device tree.
 252  *
 253  * The s5m8767 platform data structure is instantiated here and the drivers for
 254  * the sub-modules need not instantiate another instance while parsing their
 255  * platform data.
 256  */
 257 static struct sec_platform_data *
 258 sec_pmic_i2c_parse_dt_pdata(struct device *dev)
 259 {
 260         struct sec_platform_data *pd;
 261
 262         pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
 263         if (!pd)
 264                 return ERR_PTR(-ENOMEM);
 265
 266         pd->manual_poweroff = of_property_read_bool(dev->of_node,
 267                                                 "samsung,s2mps11-acokb-ground");
 268         pd->disable_wrstbi = of_property_read_bool(dev->of_node,
 269                                                 "samsung,s2mps11-wrstbi-ground");
 270         return pd;
 271 }
 272
 273 static int sec_pmic_probe(struct i2c_client *i2c)
 274 {
 275         const struct regmap_config *regmap;
 276         struct sec_platform_data *pdata;
 277         const struct mfd_cell *sec_devs;
 278         struct sec_pmic_dev *sec_pmic;
 279         int ret, num_sec_devs;
 280
 281         sec_pmic = devm_kzalloc(&i2c->dev, sizeof(struct sec_pmic_dev),
 282                                 GFP_KERNEL);
 283         if (sec_pmic == NULL)
 284                 return -ENOMEM;
 285
 286         i2c_set_clientdata(i2c, sec_pmic);
 287         sec_pmic->dev = &i2c->dev;
 288         sec_pmic->i2c = i2c;
 289         sec_pmic->irq = i2c->irq;
 290
 291         pdata = sec_pmic_i2c_parse_dt_pdata(sec_pmic->dev);
 292         if (IS_ERR(pdata)) {
 293                 ret = PTR_ERR(pdata);
 294                 return ret;
 295         }
 296
 297         sec_pmic->device_type = (unsigned long)of_device_get_match_data(sec_pmic->dev);
 298         sec_pmic->pdata = pdata;
 299
 300         switch (sec_pmic->device_type) {
 301         case S2MPA01:
 302                 regmap = &s2mpa01_regmap_config;
 303                 break;
 304         case S2MPS11X:
 305                 regmap = &s2mps11_regmap_config;
 306                 break;
 307         case S2MPS13X:
 308                 regmap = &s2mps13_regmap_config;
 309                 break;
 310         case S2MPS14X:
 311                 regmap = &s2mps14_regmap_config;
 312                 break;
 313         case S2MPS15X:
 314                 regmap = &s2mps15_regmap_config;
 315                 break;
 316         case S5M8767X:
 317                 regmap = &s5m8767_regmap_config;
 318                 break;
 319         case S2MPU02:
 320                 regmap = &s2mpu02_regmap_config;
 321                 break;
 322         default:
 323                 regmap = &sec_regmap_config;
 324                 break;
 325         }
 326
 327         sec_pmic->regmap_pmic = devm_regmap_init_i2c(i2c, regmap);
 328         if (IS_ERR(sec_pmic->regmap_pmic)) {
 329                 ret = PTR_ERR(sec_pmic->regmap_pmic);
 330                 dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
 331                         ret);
 332                 return ret;
 333         }
 334
 335         sec_irq_init(sec_pmic);
 336
 337         pm_runtime_set_active(sec_pmic->dev);
 338
 339         switch (sec_pmic->device_type) {
 340         case S5M8767X:
 341                 sec_devs = s5m8767_devs;
 342                 num_sec_devs = ARRAY_SIZE(s5m8767_devs);
 343                 break;
 344         case S2MPA01:
 345                 sec_devs = s2mpa01_devs;
 346                 num_sec_devs = ARRAY_SIZE(s2mpa01_devs);
 347                 break;
 348         case S2MPS11X:
 349                 sec_devs = s2mps11_devs;
 350                 num_sec_devs = ARRAY_SIZE(s2mps11_devs);
 351                 break;
 352         case S2MPS13X:
 353                 sec_devs = s2mps13_devs;
 354                 num_sec_devs = ARRAY_SIZE(s2mps13_devs);
 355                 break;
 356         case S2MPS14X:
 357                 sec_devs = s2mps14_devs;
 358                 num_sec_devs = ARRAY_SIZE(s2mps14_devs);
 359                 break;
 360         case S2MPS15X:
 361                 sec_devs = s2mps15_devs;
 362                 num_sec_devs = ARRAY_SIZE(s2mps15_devs);
 363                 break;
 364         case S2MPU02:
 365                 sec_devs = s2mpu02_devs;
 366                 num_sec_devs = ARRAY_SIZE(s2mpu02_devs);
 367                 break;
 368         default:
 369                 dev_err(&i2c->dev, "Unsupported device type (%lu)\n",
 370                         sec_pmic->device_type);
 371                 return -ENODEV;
 372         }
 373         ret = devm_mfd_add_devices(sec_pmic->dev, -1, sec_devs, num_sec_devs,
 374                                    NULL, 0, NULL);
 375         if (ret)
 376                 return ret;
 377
 378         sec_pmic_configure(sec_pmic);
 379         sec_pmic_dump_rev(sec_pmic);
 380
 381         return ret;
 382 }
 383
 384 static void sec_pmic_shutdown(struct i2c_client *i2c)
 385 {
 386         struct sec_pmic_dev *sec_pmic = i2c_get_clientdata(i2c);
 387         unsigned int reg, mask;
 388
 389         if (!sec_pmic->pdata->manual_poweroff)
 390                 return;
 391
 392         switch (sec_pmic->device_type) {
 393         case S2MPS11X:
 394                 reg = S2MPS11_REG_CTRL1;
 395                 mask = S2MPS11_CTRL1_PWRHOLD_MASK;
 396                 break;
 397         default:
 398                 /*
 399                  * Currently only one board with S2MPS11 needs this, so just
 400                  * ignore the rest.
 401                  */
 402                 dev_warn(sec_pmic->dev,
 403                         "Unsupported device %lu for manual power off\n",
 404                         sec_pmic->device_type);
 405                 return;
 406         }
 407
 408         regmap_update_bits(sec_pmic->regmap_pmic, reg, mask, 0);
 409 }
 410
 411 static int sec_pmic_suspend(struct device *dev)
 412 {
 413         struct i2c_client *i2c = to_i2c_client(dev);
 414         struct sec_pmic_dev *sec_pmic = i2c_get_clientdata(i2c);
 415
 416         if (device_may_wakeup(dev))
 417                 enable_irq_wake(sec_pmic->irq);
 418         /*
 419          * PMIC IRQ must be disabled during suspend for RTC alarm
 420          * to work properly.
 421          * When device is woken up from suspend, an
 422          * interrupt occurs before resuming I2C bus controller.
 423          * The interrupt is handled by regmap_irq_thread which tries
 424          * to read RTC registers. This read fails (I2C is still
 425          * suspended) and RTC Alarm interrupt is disabled.
 426          */
 427         disable_irq(sec_pmic->irq);
 428
 429         return 0;
 430 }
 431
 432 static int sec_pmic_resume(struct device *dev)
 433 {
 434         struct i2c_client *i2c = to_i2c_client(dev);
 435         struct sec_pmic_dev *sec_pmic = i2c_get_clientdata(i2c);
 436
 437         if (device_may_wakeup(dev))
 438                 disable_irq_wake(sec_pmic->irq);
 439         enable_irq(sec_pmic->irq);
 440
 441         return 0;
 442 }
 443
 444 static DEFINE_SIMPLE_DEV_PM_OPS(sec_pmic_pm_ops,
 445                                 sec_pmic_suspend, sec_pmic_resume);
 446
 447 static struct i2c_driver sec_pmic_driver = {
 448         .driver = {
 449                    .name = "sec_pmic",
 450                    .pm = pm_sleep_ptr(&sec_pmic_pm_ops),
 451                    .of_match_table = sec_dt_match,
 452         },
 453         .probe_new = sec_pmic_probe,
 454         .shutdown = sec_pmic_shutdown,
 455 };
 456 module_i2c_driver(sec_pmic_driver);
 457
 458 MODULE_AUTHOR("Sangbeom Kim <[email protected]>");
 459 MODULE_DESCRIPTION("Core support for the S5M MFD");
 460 MODULE_LICENSE("GPL");