14 #include <linux/rtc.h>
104 	struct rtc_device	*rtc;  member
113  * The Spreadtrum RTC controller has 3 groups registers, including time, normal
114  * alarm and auxiliary alarm. The time group registers are used to set RTC time,
126 static int sprd_rtc_clear_alarm_ints(struct sprd_rtc *rtc)  in sprd_rtc_clear_alarm_ints()  argument
128 	return regmap_write(rtc->regmap, rtc->base + SPRD_RTC_INT_CLR,  in sprd_rtc_clear_alarm_ints()
132 static int sprd_rtc_lock_alarm(struct sprd_rtc *rtc, bool lock)  in sprd_rtc_lock_alarm()  argument
137 	ret = regmap_read(rtc->regmap, rtc->base + SPRD_RTC_SPG_VALUE, &val);  in sprd_rtc_lock_alarm()
147 	ret = regmap_write(rtc->regmap, rtc->base + SPRD_RTC_SPG_UPD, val);  in sprd_rtc_lock_alarm()
152 	ret = regmap_read_poll_timeout(rtc->regmap,  in sprd_rtc_lock_alarm()
153 				       rtc->base + SPRD_RTC_INT_RAW_STS, val,  in sprd_rtc_lock_alarm()
158 		dev_err(rtc->dev, "failed to update SPG value:%d\n", ret);  in sprd_rtc_lock_alarm()
162 	return regmap_write(rtc->regmap, rtc->base + SPRD_RTC_INT_CLR,  in sprd_rtc_lock_alarm()
166 static int sprd_rtc_get_secs(struct sprd_rtc *rtc, enum sprd_rtc_reg_types type,  in sprd_rtc_get_secs()  argument
196 	ret = regmap_read(rtc->regmap, rtc->base + sec_reg, &val);  in sprd_rtc_get_secs()
202 	ret = regmap_read(rtc->regmap, rtc->base + min_reg, &val);  in sprd_rtc_get_secs()
208 	ret = regmap_read(rtc->regmap, rtc->base + hour_reg, &val);  in sprd_rtc_get_secs()
214 	ret = regmap_read(rtc->regmap, rtc->base + day_reg, &val);  in sprd_rtc_get_secs()
223 static int sprd_rtc_set_secs(struct sprd_rtc *rtc, enum sprd_rtc_reg_types type,  in sprd_rtc_set_secs()  argument
230 	/* convert seconds to RTC time format */  in sprd_rtc_set_secs()
263 	ret = regmap_write(rtc->regmap, rtc->base + sec_reg, sec);  in sprd_rtc_set_secs()
267 	ret = regmap_write(rtc->regmap, rtc->base + min_reg, min);  in sprd_rtc_set_secs()
271 	ret = regmap_write(rtc->regmap, rtc->base + hour_reg, hour);  in sprd_rtc_set_secs()
275 	ret = regmap_write(rtc->regmap, rtc->base + day_reg, day);  in sprd_rtc_set_secs()
288 	ret = regmap_read_poll_timeout(rtc->regmap,  in sprd_rtc_set_secs()
289 				       rtc->base + SPRD_RTC_INT_RAW_STS, val,  in sprd_rtc_set_secs()
294 		dev_err(rtc->dev, "set time/alarm values timeout\n");  in sprd_rtc_set_secs()
298 	return regmap_write(rtc->regmap, rtc->base + SPRD_RTC_INT_CLR,  in sprd_rtc_set_secs()
304 	struct sprd_rtc *rtc = dev_get_drvdata(dev);  in sprd_rtc_set_aux_alarm()  local
309 	ret = regmap_write(rtc->regmap, rtc->base + SPRD_RTC_INT_CLR,  in sprd_rtc_set_aux_alarm()
314 	ret = sprd_rtc_set_secs(rtc, SPRD_RTC_AUX_ALARM, secs);  in sprd_rtc_set_aux_alarm()
319 		ret = regmap_update_bits(rtc->regmap,  in sprd_rtc_set_aux_alarm()
320 					 rtc->base + SPRD_RTC_INT_EN,  in sprd_rtc_set_aux_alarm()
324 		ret = regmap_update_bits(rtc->regmap,  in sprd_rtc_set_aux_alarm()
325 					 rtc->base + SPRD_RTC_INT_EN,  in sprd_rtc_set_aux_alarm()
334 	struct sprd_rtc *rtc = dev_get_drvdata(dev);  in sprd_rtc_read_time()  local
338 	if (!rtc->valid) {  in sprd_rtc_read_time()
339 		dev_warn(dev, "RTC values are invalid\n");  in sprd_rtc_read_time()
343 	ret = sprd_rtc_get_secs(rtc, SPRD_RTC_TIME, &secs);  in sprd_rtc_read_time()
353 	struct sprd_rtc *rtc = dev_get_drvdata(dev);  in sprd_rtc_set_time()  local
357 	ret = sprd_rtc_set_secs(rtc, SPRD_RTC_TIME, secs);  in sprd_rtc_set_time()
361 	if (!rtc->valid) {  in sprd_rtc_set_time()
362 		/* Clear RTC power status firstly */  in sprd_rtc_set_time()
363 		ret = regmap_write(rtc->regmap, rtc->base + SPRD_RTC_PWR_CTRL,  in sprd_rtc_set_time()
369 		 * Set RTC power status to indicate now RTC has valid time  in sprd_rtc_set_time()
372 		ret = regmap_write(rtc->regmap, rtc->base + SPRD_RTC_PWR_CTRL,  in sprd_rtc_set_time()
377 		rtc->valid = true;  in sprd_rtc_set_time()
385 	struct sprd_rtc *rtc = dev_get_drvdata(dev);  in sprd_rtc_read_alarm()  local
391 	 * The RTC core checks to see if there is an alarm already set in RTC  in sprd_rtc_read_alarm()
394 	ret = sprd_rtc_get_secs(rtc, SPRD_RTC_ALARM, &secs);  in sprd_rtc_read_alarm()
400 	ret = regmap_read(rtc->regmap, rtc->base + SPRD_RTC_INT_EN, &val);  in sprd_rtc_read_alarm()
406 	ret = regmap_read(rtc->regmap, rtc->base + SPRD_RTC_INT_RAW_STS, &val);  in sprd_rtc_read_alarm()
416 	struct sprd_rtc *rtc = dev_get_drvdata(dev);  in sprd_rtc_set_alarm()  local
419 		rtc_ktime_to_tm(rtc->rtc->aie_timer.node.expires);  in sprd_rtc_set_alarm()
435 	if (!rtc->rtc->aie_timer.enabled || rtc_tm_sub(&aie_time, &alrm->time))  in sprd_rtc_set_alarm()
439 	ret = regmap_write(rtc->regmap, rtc->base + SPRD_RTC_INT_CLR,  in sprd_rtc_set_alarm()
444 	ret = sprd_rtc_set_secs(rtc, SPRD_RTC_ALARM, secs);  in sprd_rtc_set_alarm()
449 		ret = regmap_update_bits(rtc->regmap,  in sprd_rtc_set_alarm()
450 					 rtc->base + SPRD_RTC_INT_EN,  in sprd_rtc_set_alarm()
457 		ret = sprd_rtc_lock_alarm(rtc, false);  in sprd_rtc_set_alarm()
459 		regmap_update_bits(rtc->regmap,  in sprd_rtc_set_alarm()
460 				   rtc->base + SPRD_RTC_INT_EN,  in sprd_rtc_set_alarm()
467 		ret = sprd_rtc_lock_alarm(rtc, true);  in sprd_rtc_set_alarm()
475 	struct sprd_rtc *rtc = dev_get_drvdata(dev);  in sprd_rtc_alarm_irq_enable()  local
479 		ret = regmap_update_bits(rtc->regmap,  in sprd_rtc_alarm_irq_enable()
480 					 rtc->base + SPRD_RTC_INT_EN,  in sprd_rtc_alarm_irq_enable()
486 		ret = sprd_rtc_lock_alarm(rtc, false);  in sprd_rtc_alarm_irq_enable()
488 		regmap_update_bits(rtc->regmap, rtc->base + SPRD_RTC_INT_EN,  in sprd_rtc_alarm_irq_enable()
491 		ret = sprd_rtc_lock_alarm(rtc, true);  in sprd_rtc_alarm_irq_enable()
507 	struct sprd_rtc *rtc = dev_id;  in sprd_rtc_handler()  local
510 	ret = sprd_rtc_clear_alarm_ints(rtc);  in sprd_rtc_handler()
514 	rtc_update_irq(rtc->rtc, 1, RTC_AF | RTC_IRQF);  in sprd_rtc_handler()
518 static int sprd_rtc_check_power_down(struct sprd_rtc *rtc)  in sprd_rtc_check_power_down()  argument
523 	ret = regmap_read(rtc->regmap, rtc->base + SPRD_RTC_PWR_STS, &val);  in sprd_rtc_check_power_down()
528 	 * If the RTC power status value is SPRD_RTC_POWER_RESET_VALUE, which  in sprd_rtc_check_power_down()
529 	 * means the RTC has been powered down, so the RTC time values are  in sprd_rtc_check_power_down()
532 	rtc->valid = val != SPRD_RTC_POWER_RESET_VALUE;  in sprd_rtc_check_power_down()
536 static int sprd_rtc_check_alarm_int(struct sprd_rtc *rtc)  in sprd_rtc_check_alarm_int()  argument
541 	ret = regmap_read(rtc->regmap, rtc->base + SPRD_RTC_SPG_VALUE, &val);  in sprd_rtc_check_alarm_int()
552 	 * so we should enable the alarm interrupt to help RTC core to see if  in sprd_rtc_check_alarm_int()
553 	 * there is an alarm already set in RTC hardware.  in sprd_rtc_check_alarm_int()
558 	return regmap_update_bits(rtc->regmap, rtc->base + SPRD_RTC_INT_EN,  in sprd_rtc_check_alarm_int()
565 	struct sprd_rtc *rtc;  in sprd_rtc_probe()  local
568 	rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);  in sprd_rtc_probe()
569 	if (!rtc)  in sprd_rtc_probe()
572 	rtc->regmap = dev_get_regmap(pdev->dev.parent, NULL);  in sprd_rtc_probe()
573 	if (!rtc->regmap)  in sprd_rtc_probe()
576 	ret = of_property_read_u32(node, "reg", &rtc->base);  in sprd_rtc_probe()
578 		dev_err(&pdev->dev, "failed to get RTC base address\n");  in sprd_rtc_probe()
582 	rtc->irq = platform_get_irq(pdev, 0);  in sprd_rtc_probe()
583 	if (rtc->irq < 0)  in sprd_rtc_probe()
584 		return rtc->irq;  in sprd_rtc_probe()
586 	rtc->rtc = devm_rtc_allocate_device(&pdev->dev);  in sprd_rtc_probe()
587 	if (IS_ERR(rtc->rtc))  in sprd_rtc_probe()
588 		return PTR_ERR(rtc->rtc);  in sprd_rtc_probe()
590 	rtc->dev = &pdev->dev;  in sprd_rtc_probe()
591 	platform_set_drvdata(pdev, rtc);  in sprd_rtc_probe()
594 	ret = sprd_rtc_check_alarm_int(rtc);  in sprd_rtc_probe()
596 		dev_err(&pdev->dev, "failed to check RTC alarm interrupt\n");  in sprd_rtc_probe()
600 	/* check if RTC time values are valid */  in sprd_rtc_probe()
601 	ret = sprd_rtc_check_power_down(rtc);  in sprd_rtc_probe()
603 		dev_err(&pdev->dev, "failed to check RTC time values\n");  in sprd_rtc_probe()
607 	ret = devm_request_threaded_irq(&pdev->dev, rtc->irq, NULL,  in sprd_rtc_probe()
610 					pdev->name, rtc);  in sprd_rtc_probe()
612 		dev_err(&pdev->dev, "failed to request RTC irq\n");  in sprd_rtc_probe()
618 	rtc->rtc->ops = &sprd_rtc_ops;  in sprd_rtc_probe()
619 	rtc->rtc->range_min = 0;  in sprd_rtc_probe()
620 	rtc->rtc->range_max = 5662310399LL;  in sprd_rtc_probe()
621 	ret = devm_rtc_register_device(rtc->rtc);  in sprd_rtc_probe()
631 	{ .compatible = "sprd,sc2731-rtc", },
638 		.name = "sprd-rtc",
646 MODULE_DESCRIPTION("Spreadtrum RTC Device Driver");