1 /* rtc-da9063.c - Real time clock device driver for DA9063 2 * Copyright (C) 2013-14 Dialog Semiconductor Ltd. 3 * 4 * This library is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU Library General Public 6 * License as published by the Free Software Foundation; either 7 * version 2 of the License, or (at your option) any later version. 8 * 9 * This library 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 GNU 12 * Library 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 irq_alarm = platform_get_irq_byname(pdev, "ALARM"); 487 ret = devm_request_threaded_irq(&pdev->dev, irq_alarm, NULL, 488 da9063_alarm_event, 489 IRQF_TRIGGER_LOW | IRQF_ONESHOT, 490 "ALARM", rtc); 491 if (ret) { 492 dev_err(&pdev->dev, "Failed to request ALARM IRQ %d: %d\n", 493 irq_alarm, ret); 494 return ret; 495 } 496 497 rtc->rtc_dev = devm_rtc_device_register(&pdev->dev, DA9063_DRVNAME_RTC, 498 &da9063_rtc_ops, THIS_MODULE); 499 if (IS_ERR(rtc->rtc_dev)) 500 return PTR_ERR(rtc->rtc_dev); 501 502 da9063_data_to_tm(data, &rtc->alarm_time, rtc); 503 rtc->rtc_sync = false; 504 return ret; 505 } 506 507 static struct platform_driver da9063_rtc_driver = { 508 .probe = da9063_rtc_probe, 509 .driver = { 510 .name = DA9063_DRVNAME_RTC, 511 .of_match_table = da9063_compatible_reg_id_table, 512 }, 513 }; 514 515 module_platform_driver(da9063_rtc_driver); 516 517 MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>"); 518 MODULE_DESCRIPTION("Real time clock device driver for Dialog DA9063"); 519 MODULE_LICENSE("GPL v2"); 520 MODULE_ALIAS("platform:" DA9063_DRVNAME_RTC); 521