kernel/drivers/rtc/rtc-da9063.c

   1 /* rtc-da9063.c - Real time clock device driver for DA9063
   2  * Copyright (C) 2013-2015  Dialog Semiconductor Ltd.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version 2
   7  * of the License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #include <linux/delay.h>
  16 #include <linux/init.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/kernel.h>
  19 #include <linux/module.h>
  20 #include <linux/of.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/regmap.h>
  23 #include <linux/rtc.h>
  24 #include <linux/slab.h>
  25
  26 #include <linux/mfd/da9062/registers.h>
  27 #include <linux/mfd/da9063/registers.h>
  28 #include <linux/mfd/da9063/core.h>
  29
  30 #define YEARS_TO_DA9063(year)           ((year) - 100)
  31 #define MONTHS_TO_DA9063(month)         ((month) + 1)
  32 #define YEARS_FROM_DA9063(year)         ((year) + 100)
  33 #define MONTHS_FROM_DA9063(month)       ((month) - 1)
  34
  35 enum {
  36         RTC_SEC = 0,
  37         RTC_MIN = 1,
  38         RTC_HOUR = 2,
  39         RTC_DAY = 3,
  40         RTC_MONTH = 4,
  41         RTC_YEAR = 5,
  42         RTC_DATA_LEN
  43 };
  44
  45 struct da9063_compatible_rtc_regmap {
  46         /* REGS */
  47         int rtc_enable_reg;
  48         int rtc_enable_32k_crystal_reg;
  49         int rtc_alarm_secs_reg;
  50         int rtc_alarm_year_reg;
  51         int rtc_count_secs_reg;
  52         int rtc_count_year_reg;
  53         int rtc_event_reg;
  54         /* MASKS */
  55         int rtc_enable_mask;
  56         int rtc_crystal_mask;
  57         int rtc_event_alarm_mask;
  58         int rtc_alarm_on_mask;
  59         int rtc_alarm_status_mask;
  60         int rtc_tick_on_mask;
  61         int rtc_ready_to_read_mask;
  62         int rtc_count_sec_mask;
  63         int rtc_count_min_mask;
  64         int rtc_count_hour_mask;
  65         int rtc_count_day_mask;
  66         int rtc_count_month_mask;
  67         int rtc_count_year_mask;
  68         /* ALARM CONFIG */
  69         int rtc_data_start;
  70         int rtc_alarm_len;
  71 };
  72
  73 struct da9063_compatible_rtc {
  74         struct rtc_device *rtc_dev;
  75         struct rtc_time alarm_time;
  76         struct regmap *regmap;
  77         const struct da9063_compatible_rtc_regmap *config;
  78         bool rtc_sync;
  79 };
  80
  81 static const struct da9063_compatible_rtc_regmap da9063_ad_regs = {
  82         /* REGS */
  83         .rtc_enable_reg             = DA9063_REG_CONTROL_E,
  84         .rtc_alarm_secs_reg         = DA9063_AD_REG_ALARM_MI,
  85         .rtc_alarm_year_reg         = DA9063_AD_REG_ALARM_Y,
  86         .rtc_count_secs_reg         = DA9063_REG_COUNT_S,
  87         .rtc_count_year_reg         = DA9063_REG_COUNT_Y,
  88         .rtc_event_reg              = DA9063_REG_EVENT_A,
  89         /* MASKS */
  90         .rtc_enable_mask            = DA9063_RTC_EN,
  91         .rtc_crystal_mask           = DA9063_CRYSTAL,
  92         .rtc_enable_32k_crystal_reg = DA9063_REG_EN_32K,
  93         .rtc_event_alarm_mask       = DA9063_E_ALARM,
  94         .rtc_alarm_on_mask          = DA9063_ALARM_ON,
  95         .rtc_alarm_status_mask      = DA9063_ALARM_STATUS_ALARM |
  96                                       DA9063_ALARM_STATUS_TICK,
  97         .rtc_tick_on_mask           = DA9063_TICK_ON,
  98         .rtc_ready_to_read_mask     = DA9063_RTC_READ,
  99         .rtc_count_sec_mask         = DA9063_COUNT_SEC_MASK,
 100         .rtc_count_min_mask         = DA9063_COUNT_MIN_MASK,
 101         .rtc_count_hour_mask        = DA9063_COUNT_HOUR_MASK,
 102         .rtc_count_day_mask         = DA9063_COUNT_DAY_MASK,
 103         .rtc_count_month_mask       = DA9063_COUNT_MONTH_MASK,
 104         .rtc_count_year_mask        = DA9063_COUNT_YEAR_MASK,
 105         /* ALARM CONFIG */
 106         .rtc_data_start             = RTC_MIN,
 107         .rtc_alarm_len              = RTC_DATA_LEN - 1,
 108 };
 109
 110 static const struct da9063_compatible_rtc_regmap da9063_bb_regs = {
 111         /* REGS */
 112         .rtc_enable_reg             = DA9063_REG_CONTROL_E,
 113         .rtc_alarm_secs_reg         = DA9063_BB_REG_ALARM_S,
 114         .rtc_alarm_year_reg         = DA9063_BB_REG_ALARM_Y,
 115         .rtc_count_secs_reg         = DA9063_REG_COUNT_S,
 116         .rtc_count_year_reg         = DA9063_REG_COUNT_Y,
 117         .rtc_event_reg              = DA9063_REG_EVENT_A,
 118         /* MASKS */
 119         .rtc_enable_mask            = DA9063_RTC_EN,
 120         .rtc_crystal_mask           = DA9063_CRYSTAL,
 121         .rtc_enable_32k_crystal_reg = DA9063_REG_EN_32K,
 122         .rtc_event_alarm_mask       = DA9063_E_ALARM,
 123         .rtc_alarm_on_mask          = DA9063_ALARM_ON,
 124         .rtc_alarm_status_mask      = DA9063_ALARM_STATUS_ALARM |
 125                                       DA9063_ALARM_STATUS_TICK,
 126         .rtc_tick_on_mask           = DA9063_TICK_ON,
 127         .rtc_ready_to_read_mask     = DA9063_RTC_READ,
 128         .rtc_count_sec_mask         = DA9063_COUNT_SEC_MASK,
 129         .rtc_count_min_mask         = DA9063_COUNT_MIN_MASK,
 130         .rtc_count_hour_mask        = DA9063_COUNT_HOUR_MASK,
 131         .rtc_count_day_mask         = DA9063_COUNT_DAY_MASK,
 132         .rtc_count_month_mask       = DA9063_COUNT_MONTH_MASK,
 133         .rtc_count_year_mask        = DA9063_COUNT_YEAR_MASK,
 134         /* ALARM CONFIG */
 135         .rtc_data_start             = RTC_SEC,
 136         .rtc_alarm_len              = RTC_DATA_LEN,
 137 };
 138
 139 static const struct da9063_compatible_rtc_regmap da9062_aa_regs = {
 140         /* REGS */
 141         .rtc_enable_reg             = DA9062AA_CONTROL_E,
 142         .rtc_alarm_secs_reg         = DA9062AA_ALARM_S,
 143         .rtc_alarm_year_reg         = DA9062AA_ALARM_Y,
 144         .rtc_count_secs_reg         = DA9062AA_COUNT_S,
 145         .rtc_count_year_reg         = DA9062AA_COUNT_Y,
 146         .rtc_event_reg              = DA9062AA_EVENT_A,
 147         /* MASKS */
 148         .rtc_enable_mask            = DA9062AA_RTC_EN_MASK,
 149         .rtc_crystal_mask           = DA9062AA_CRYSTAL_MASK,
 150         .rtc_enable_32k_crystal_reg = DA9062AA_EN_32K,
 151         .rtc_event_alarm_mask       = DA9062AA_M_ALARM_MASK,
 152         .rtc_alarm_on_mask          = DA9062AA_ALARM_ON_MASK,
 153         .rtc_alarm_status_mask      = (0x02 << 6),
 154         .rtc_tick_on_mask           = DA9062AA_TICK_ON_MASK,
 155         .rtc_ready_to_read_mask     = DA9062AA_RTC_READ_MASK,
 156         .rtc_count_sec_mask         = DA9062AA_COUNT_SEC_MASK,
 157         .rtc_count_min_mask         = DA9062AA_COUNT_MIN_MASK,
 158         .rtc_count_hour_mask        = DA9062AA_COUNT_HOUR_MASK,
 159         .rtc_count_day_mask         = DA9062AA_COUNT_DAY_MASK,
 160         .rtc_count_month_mask       = DA9062AA_COUNT_MONTH_MASK,
 161         .rtc_count_year_mask        = DA9062AA_COUNT_YEAR_MASK,
 162         /* ALARM CONFIG */
 163         .rtc_data_start             = RTC_SEC,
 164         .rtc_alarm_len              = RTC_DATA_LEN,
 165 };
 166
 167 static const struct of_device_id da9063_compatible_reg_id_table[] = {
 168         { .compatible = "dlg,da9063-rtc", .data = &da9063_bb_regs },
 169         { .compatible = "dlg,da9062-rtc", .data = &da9062_aa_regs },
 170         { },
 171 };
 172 MODULE_DEVICE_TABLE(of, da9063_compatible_reg_id_table);
 173
 174 static void da9063_data_to_tm(u8 *data, struct rtc_time *tm,
 175                               struct da9063_compatible_rtc *rtc)
 176 {
 177         const struct da9063_compatible_rtc_regmap *config = rtc->config;
 178
 179         tm->tm_sec  = data[RTC_SEC]  & config->rtc_count_sec_mask;
 180         tm->tm_min  = data[RTC_MIN]  & config->rtc_count_min_mask;
 181         tm->tm_hour = data[RTC_HOUR] & config->rtc_count_hour_mask;
 182         tm->tm_mday = data[RTC_DAY]  & config->rtc_count_day_mask;
 183         tm->tm_mon  = MONTHS_FROM_DA9063(data[RTC_MONTH] &
 184                                          config->rtc_count_month_mask);
 185         tm->tm_year = YEARS_FROM_DA9063(data[RTC_YEAR] &
 186                                         config->rtc_count_year_mask);
 187 }
 188
 189 static void da9063_tm_to_data(struct rtc_time *tm, u8 *data,
 190                               struct da9063_compatible_rtc *rtc)
 191 {
 192         const struct da9063_compatible_rtc_regmap *config = rtc->config;
 193
 194         data[RTC_SEC] &= ~config->rtc_count_sec_mask;
 195         data[RTC_SEC] |= tm->tm_sec & config->rtc_count_sec_mask;
 196
 197         data[RTC_MIN] &= ~config->rtc_count_min_mask;
 198         data[RTC_MIN] |= tm->tm_min & config->rtc_count_min_mask;
 199
 200         data[RTC_HOUR] &= ~config->rtc_count_hour_mask;
 201         data[RTC_HOUR] |= tm->tm_hour & config->rtc_count_hour_mask;
 202
 203         data[RTC_DAY] &= ~config->rtc_count_day_mask;
 204         data[RTC_DAY] |= tm->tm_mday & config->rtc_count_day_mask;
 205
 206         data[RTC_MONTH] &= ~config->rtc_count_month_mask;
 207         data[RTC_MONTH] |= MONTHS_TO_DA9063(tm->tm_mon) &
 208                                 config->rtc_count_month_mask;
 209
 210         data[RTC_YEAR] &= ~config->rtc_count_year_mask;
 211         data[RTC_YEAR] |= YEARS_TO_DA9063(tm->tm_year) &
 212                                 config->rtc_count_year_mask;
 213 }
 214
 215 static int da9063_rtc_stop_alarm(struct device *dev)
 216 {
 217         struct da9063_compatible_rtc *rtc = dev_get_drvdata(dev);
 218         const struct da9063_compatible_rtc_regmap *config = rtc->config;
 219
 220         return regmap_update_bits(rtc->regmap,
 221                                   config->rtc_alarm_year_reg,
 222                                   config->rtc_alarm_on_mask,
 223                                   0);
 224 }
 225
 226 static int da9063_rtc_start_alarm(struct device *dev)
 227 {
 228         struct da9063_compatible_rtc *rtc = dev_get_drvdata(dev);
 229         const struct da9063_compatible_rtc_regmap *config = rtc->config;
 230
 231         return regmap_update_bits(rtc->regmap,
 232                                   config->rtc_alarm_year_reg,
 233                                   config->rtc_alarm_on_mask,
 234                                   config->rtc_alarm_on_mask);
 235 }
 236
 237 static int da9063_rtc_read_time(struct device *dev, struct rtc_time *tm)
 238 {
 239         struct da9063_compatible_rtc *rtc = dev_get_drvdata(dev);
 240         const struct da9063_compatible_rtc_regmap *config = rtc->config;
 241         unsigned long tm_secs;
 242         unsigned long al_secs;
 243         u8 data[RTC_DATA_LEN];
 244         int ret;
 245
 246         ret = regmap_bulk_read(rtc->regmap,
 247                                config->rtc_count_secs_reg,
 248                                data, RTC_DATA_LEN);
 249         if (ret < 0) {
 250                 dev_err(dev, "Failed to read RTC time data: %d\n", ret);
 251                 return ret;
 252         }
 253
 254         if (!(data[RTC_SEC] & config->rtc_ready_to_read_mask)) {
 255                 dev_dbg(dev, "RTC not yet ready to be read by the host\n");
 256                 return -EINVAL;
 257         }
 258
 259         da9063_data_to_tm(data, tm, rtc);
 260
 261         rtc_tm_to_time(tm, &tm_secs);
 262         rtc_tm_to_time(&rtc->alarm_time, &al_secs);
 263
 264         /* handle the rtc synchronisation delay */
 265         if (rtc->rtc_sync == true && al_secs - tm_secs == 1)
 266                 memcpy(tm, &rtc->alarm_time, sizeof(struct rtc_time));
 267         else
 268                 rtc->rtc_sync = false;
 269
 270         return rtc_valid_tm(tm);
 271 }
 272
 273 static int da9063_rtc_set_time(struct device *dev, struct rtc_time *tm)
 274 {
 275         struct da9063_compatible_rtc *rtc = dev_get_drvdata(dev);
 276         const struct da9063_compatible_rtc_regmap *config = rtc->config;
 277         u8 data[RTC_DATA_LEN];
 278         int ret;
 279
 280         da9063_tm_to_data(tm, data, rtc);
 281         ret = regmap_bulk_write(rtc->regmap,
 282                                 config->rtc_count_secs_reg,
 283                                 data, RTC_DATA_LEN);
 284         if (ret < 0)
 285                 dev_err(dev, "Failed to set RTC time data: %d\n", ret);
 286
 287         return ret;
 288 }
 289
 290 static int da9063_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 291 {
 292         struct da9063_compatible_rtc *rtc = dev_get_drvdata(dev);
 293         const struct da9063_compatible_rtc_regmap *config = rtc->config;
 294         u8 data[RTC_DATA_LEN];
 295         int ret;
 296         unsigned int val;
 297
 298         data[RTC_SEC] = 0;
 299         ret = regmap_bulk_read(rtc->regmap,
 300                                config->rtc_alarm_secs_reg,
 301                                &data[config->rtc_data_start],
 302                                config->rtc_alarm_len);
 303         if (ret < 0)
 304                 return ret;
 305
 306         da9063_data_to_tm(data, &alrm->time, rtc);
 307
 308         alrm->enabled = !!(data[RTC_YEAR] & config->rtc_alarm_on_mask);
 309
 310         ret = regmap_read(rtc->regmap,
 311                           config->rtc_event_reg,
 312                           &val);
 313         if (ret < 0)
 314                 return ret;
 315
 316         if (val & config->rtc_event_alarm_mask)
 317                 alrm->pending = 1;
 318         else
 319                 alrm->pending = 0;
 320
 321         return 0;
 322 }
 323
 324 static int da9063_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 325 {
 326         struct da9063_compatible_rtc *rtc = dev_get_drvdata(dev);
 327         const struct da9063_compatible_rtc_regmap *config = rtc->config;
 328         u8 data[RTC_DATA_LEN];
 329         int ret;
 330
 331         da9063_tm_to_data(&alrm->time, data, rtc);
 332
 333         ret = da9063_rtc_stop_alarm(dev);
 334         if (ret < 0) {
 335                 dev_err(dev, "Failed to stop alarm: %d\n", ret);
 336                 return ret;
 337         }
 338
 339         ret = regmap_bulk_write(rtc->regmap,
 340                                 config->rtc_alarm_secs_reg,
 341                                 &data[config->rtc_data_start],
 342                                 config->rtc_alarm_len);
 343         if (ret < 0) {
 344                 dev_err(dev, "Failed to write alarm: %d\n", ret);
 345                 return ret;
 346         }
 347
 348         da9063_data_to_tm(data, &rtc->alarm_time, rtc);
 349
 350         if (alrm->enabled) {
 351                 ret = da9063_rtc_start_alarm(dev);
 352                 if (ret < 0) {
 353                         dev_err(dev, "Failed to start alarm: %d\n", ret);
 354                         return ret;
 355                 }
 356         }
 357
 358         return ret;
 359 }
 360
 361 static int da9063_rtc_alarm_irq_enable(struct device *dev,
 362                                        unsigned int enabled)
 363 {
 364         if (enabled)
 365                 return da9063_rtc_start_alarm(dev);
 366         else
 367                 return da9063_rtc_stop_alarm(dev);
 368 }
 369
 370 static irqreturn_t da9063_alarm_event(int irq, void *data)
 371 {
 372         struct da9063_compatible_rtc *rtc = data;
 373         const struct da9063_compatible_rtc_regmap *config = rtc->config;
 374
 375         regmap_update_bits(rtc->regmap,
 376                            config->rtc_alarm_year_reg,
 377                            config->rtc_alarm_on_mask,
 378                            0);
 379
 380         rtc->rtc_sync = true;
 381         rtc_update_irq(rtc->rtc_dev, 1, RTC_IRQF | RTC_AF);
 382
 383         return IRQ_HANDLED;
 384 }
 385
 386 static const struct rtc_class_ops da9063_rtc_ops = {
 387         .read_time = da9063_rtc_read_time,
 388         .set_time = da9063_rtc_set_time,
 389         .read_alarm = da9063_rtc_read_alarm,
 390         .set_alarm = da9063_rtc_set_alarm,
 391         .alarm_irq_enable = da9063_rtc_alarm_irq_enable,
 392 };
 393
 394 static int da9063_rtc_probe(struct platform_device *pdev)
 395 {
 396         struct da9063_compatible_rtc *rtc;
 397         const struct da9063_compatible_rtc_regmap *config;
 398         const struct of_device_id *match;
 399         int irq_alarm;
 400         u8 data[RTC_DATA_LEN];
 401         int ret;
 402
 403         if (!pdev->dev.of_node)
 404                 return -ENXIO;
 405
 406         match = of_match_node(da9063_compatible_reg_id_table,
 407                               pdev->dev.of_node);
 408
 409         rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
 410         if (!rtc)
 411                 return -ENOMEM;
 412
 413         rtc->config = match->data;
 414         if (of_device_is_compatible(pdev->dev.of_node, "dlg,da9063-rtc")) {
 415                 struct da9063 *chip = dev_get_drvdata(pdev->dev.parent);
 416
 417                 if (chip->variant_code == PMIC_DA9063_AD)
 418                         rtc->config = &da9063_ad_regs;
 419         }
 420
 421         rtc->regmap = dev_get_regmap(pdev->dev.parent, NULL);
 422         if (!rtc->regmap) {
 423                 dev_warn(&pdev->dev, "Parent regmap unavailable.\n");
 424                 return -ENXIO;
 425         }
 426
 427         config = rtc->config;
 428         ret = regmap_update_bits(rtc->regmap,
 429                                  config->rtc_enable_reg,
 430                                  config->rtc_enable_mask,
 431                                  config->rtc_enable_mask);
 432         if (ret < 0) {
 433                 dev_err(&pdev->dev, "Failed to enable RTC\n");
 434                 return ret;
 435         }
 436
 437         ret = regmap_update_bits(rtc->regmap,
 438                                  config->rtc_enable_32k_crystal_reg,
 439                                  config->rtc_crystal_mask,
 440                                  config->rtc_crystal_mask);
 441         if (ret < 0) {
 442                 dev_err(&pdev->dev, "Failed to run 32kHz oscillator\n");
 443                 return ret;
 444         }
 445
 446         ret = regmap_update_bits(rtc->regmap,
 447                                  config->rtc_alarm_secs_reg,
 448                                  config->rtc_alarm_status_mask,
 449                                  0);
 450         if (ret < 0) {
 451                 dev_err(&pdev->dev, "Failed to access RTC alarm register\n");
 452                 return ret;
 453         }
 454
 455         ret = regmap_update_bits(rtc->regmap,
 456                                  config->rtc_alarm_secs_reg,
 457                                  DA9063_ALARM_STATUS_ALARM,
 458                                  DA9063_ALARM_STATUS_ALARM);
 459         if (ret < 0) {
 460                 dev_err(&pdev->dev, "Failed to access RTC alarm register\n");
 461                 return ret;
 462         }
 463
 464         ret = regmap_update_bits(rtc->regmap,
 465                                  config->rtc_alarm_year_reg,
 466                                  config->rtc_tick_on_mask,
 467                                  0);
 468         if (ret < 0) {
 469                 dev_err(&pdev->dev, "Failed to disable TICKs\n");
 470                 return ret;
 471         }
 472
 473         data[RTC_SEC] = 0;
 474         ret = regmap_bulk_read(rtc->regmap,
 475                                config->rtc_alarm_secs_reg,
 476                                &data[config->rtc_data_start],
 477                                config->rtc_alarm_len);
 478         if (ret < 0) {
 479                 dev_err(&pdev->dev, "Failed to read initial alarm data: %d\n",
 480                         ret);
 481                 return ret;
 482         }
 483
 484         platform_set_drvdata(pdev, rtc);
 485
 486         rtc->rtc_dev = devm_rtc_device_register(&pdev->dev, DA9063_DRVNAME_RTC,
 487                                            &da9063_rtc_ops, THIS_MODULE);
 488         if (IS_ERR(rtc->rtc_dev))
 489                 return PTR_ERR(rtc->rtc_dev);
 490
 491         da9063_data_to_tm(data, &rtc->alarm_time, rtc);
 492         rtc->rtc_sync = false;
 493
 494         irq_alarm = platform_get_irq_byname(pdev, "ALARM");
 495         ret = devm_request_threaded_irq(&pdev->dev, irq_alarm, NULL,
 496                                         da9063_alarm_event,
 497                                         IRQF_TRIGGER_LOW | IRQF_ONESHOT,
 498                                         "ALARM", rtc);
 499         if (ret)
 500                 dev_err(&pdev->dev, "Failed to request ALARM IRQ %d: %d\n",
 501                         irq_alarm, ret);
 502
 503         return ret;
 504 }
 505
 506 static struct platform_driver da9063_rtc_driver = {
 507         .probe          = da9063_rtc_probe,
 508         .driver         = {
 509                 .name   = DA9063_DRVNAME_RTC,
 510                 .of_match_table = da9063_compatible_reg_id_table,
 511         },
 512 };
 513
 514 module_platform_driver(da9063_rtc_driver);
 515
 516 MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>");
 517 MODULE_DESCRIPTION("Real time clock device driver for Dialog DA9063");
 518 MODULE_LICENSE("GPL");
 519 MODULE_ALIAS("platform:" DA9063_DRVNAME_RTC);