1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2014-2015 MediaTek Inc.
15 #include <linux/rtc.h>
16 #include <linux/mfd/mt6397/rtc.h>
19 static int mtk_rtc_write_trigger(struct mt6397_rtc *rtc)  in mtk_rtc_write_trigger()  argument
24 	ret = regmap_write(rtc->regmap, rtc->addr_base + rtc->data->wrtgr, 1);  in mtk_rtc_write_trigger()
28 	ret = regmap_read_poll_timeout(rtc->regmap,  in mtk_rtc_write_trigger()
29 					rtc->addr_base + RTC_BBPU, data,  in mtk_rtc_write_trigger()
34 		dev_err(rtc->rtc_dev->dev.parent,  in mtk_rtc_write_trigger()
42 	struct mt6397_rtc *rtc = data;  in mtk_rtc_irq_handler_thread()  local
46 	ret = regmap_read(rtc->regmap, rtc->addr_base + RTC_IRQ_STA, &irqsta);  in mtk_rtc_irq_handler_thread()
48 		rtc_update_irq(rtc->rtc_dev, 1, RTC_IRQF | RTC_AF);  in mtk_rtc_irq_handler_thread()
50 		mutex_lock(&rtc->lock);  in mtk_rtc_irq_handler_thread()
51 		if (regmap_write(rtc->regmap, rtc->addr_base + RTC_IRQ_EN,  in mtk_rtc_irq_handler_thread()
53 			mtk_rtc_write_trigger(rtc);  in mtk_rtc_irq_handler_thread()
54 		mutex_unlock(&rtc->lock);  in mtk_rtc_irq_handler_thread()
62 static int __mtk_rtc_read_time(struct mt6397_rtc *rtc,  in __mtk_rtc_read_time()  argument
68 	mutex_lock(&rtc->lock);  in __mtk_rtc_read_time()
69 	ret = regmap_bulk_read(rtc->regmap, rtc->addr_base + RTC_TC_SEC,  in __mtk_rtc_read_time()
74 	tm->tm_sec = data[RTC_OFFSET_SEC];  in __mtk_rtc_read_time()
75 	tm->tm_min = data[RTC_OFFSET_MIN];  in __mtk_rtc_read_time()
76 	tm->tm_hour = data[RTC_OFFSET_HOUR];  in __mtk_rtc_read_time()
77 	tm->tm_mday = data[RTC_OFFSET_DOM];  in __mtk_rtc_read_time()
78 	tm->tm_wday = data[RTC_OFFSET_DOW];  in __mtk_rtc_read_time()
79 	tm->tm_mon = data[RTC_OFFSET_MTH] & RTC_TC_MTH_MASK;  in __mtk_rtc_read_time()
80 	tm->tm_year = data[RTC_OFFSET_YEAR];  in __mtk_rtc_read_time()
82 	ret = regmap_read(rtc->regmap, rtc->addr_base + RTC_TC_SEC, sec);  in __mtk_rtc_read_time()
84 	mutex_unlock(&rtc->lock);  in __mtk_rtc_read_time()
90 	struct mt6397_rtc *rtc = dev_get_drvdata(dev);  in mtk_rtc_read_time()  local
94 		ret = __mtk_rtc_read_time(rtc, tm, &sec);  in mtk_rtc_read_time()
97 	} while (sec < tm->tm_sec);  in mtk_rtc_read_time()
100 	tm->tm_mon--;  in mtk_rtc_read_time()
101 	tm->tm_wday--;  in mtk_rtc_read_time()
109 	struct mt6397_rtc *rtc = dev_get_drvdata(dev);  in mtk_rtc_set_time()  local
113 	tm->tm_mon++;  in mtk_rtc_set_time()
114 	tm->tm_wday++;  in mtk_rtc_set_time()
116 	data[RTC_OFFSET_SEC] = tm->tm_sec;  in mtk_rtc_set_time()
117 	data[RTC_OFFSET_MIN] = tm->tm_min;  in mtk_rtc_set_time()
118 	data[RTC_OFFSET_HOUR] = tm->tm_hour;  in mtk_rtc_set_time()
119 	data[RTC_OFFSET_DOM] = tm->tm_mday;  in mtk_rtc_set_time()
120 	data[RTC_OFFSET_DOW] = tm->tm_wday;  in mtk_rtc_set_time()
121 	data[RTC_OFFSET_MTH] = tm->tm_mon;  in mtk_rtc_set_time()
122 	data[RTC_OFFSET_YEAR] = tm->tm_year;  in mtk_rtc_set_time()
124 	mutex_lock(&rtc->lock);  in mtk_rtc_set_time()
125 	ret = regmap_bulk_write(rtc->regmap, rtc->addr_base + RTC_TC_SEC,  in mtk_rtc_set_time()
131 	ret = mtk_rtc_write_trigger(rtc);  in mtk_rtc_set_time()
134 	mutex_unlock(&rtc->lock);  in mtk_rtc_set_time()
140 	struct rtc_time *tm = &alm->time;  in mtk_rtc_read_alarm()
141 	struct mt6397_rtc *rtc = dev_get_drvdata(dev);  in mtk_rtc_read_alarm()  local
146 	mutex_lock(&rtc->lock);  in mtk_rtc_read_alarm()
147 	ret = regmap_read(rtc->regmap, rtc->addr_base + RTC_IRQ_EN, &irqen);  in mtk_rtc_read_alarm()
150 	ret = regmap_read(rtc->regmap, rtc->addr_base + RTC_PDN2, &pdn2);  in mtk_rtc_read_alarm()
154 	ret = regmap_bulk_read(rtc->regmap, rtc->addr_base + RTC_AL_SEC,  in mtk_rtc_read_alarm()
159 	alm->enabled = !!(irqen & RTC_IRQ_EN_AL);  in mtk_rtc_read_alarm()
160 	alm->pending = !!(pdn2 & RTC_PDN2_PWRON_ALARM);  in mtk_rtc_read_alarm()
161 	mutex_unlock(&rtc->lock);  in mtk_rtc_read_alarm()
163 	tm->tm_sec = data[RTC_OFFSET_SEC] & RTC_AL_SEC_MASK;  in mtk_rtc_read_alarm()
164 	tm->tm_min = data[RTC_OFFSET_MIN] & RTC_AL_MIN_MASK;  in mtk_rtc_read_alarm()
165 	tm->tm_hour = data[RTC_OFFSET_HOUR] & RTC_AL_HOU_MASK;  in mtk_rtc_read_alarm()
166 	tm->tm_mday = data[RTC_OFFSET_DOM] & RTC_AL_DOM_MASK;  in mtk_rtc_read_alarm()
167 	tm->tm_mon = data[RTC_OFFSET_MTH] & RTC_AL_MTH_MASK;  in mtk_rtc_read_alarm()
168 	tm->tm_year = data[RTC_OFFSET_YEAR] & RTC_AL_YEA_MASK;  in mtk_rtc_read_alarm()
170 	tm->tm_mon--;  in mtk_rtc_read_alarm()
174 	mutex_unlock(&rtc->lock);  in mtk_rtc_read_alarm()
180 	struct rtc_time *tm = &alm->time;  in mtk_rtc_set_alarm()
181 	struct mt6397_rtc *rtc = dev_get_drvdata(dev);  in mtk_rtc_set_alarm()  local
185 	tm->tm_mon++;  in mtk_rtc_set_alarm()
187 	mutex_lock(&rtc->lock);  in mtk_rtc_set_alarm()
188 	ret = regmap_bulk_read(rtc->regmap, rtc->addr_base + RTC_AL_SEC,  in mtk_rtc_set_alarm()
194 				(tm->tm_sec & RTC_AL_SEC_MASK));  in mtk_rtc_set_alarm()
196 				(tm->tm_min & RTC_AL_MIN_MASK));  in mtk_rtc_set_alarm()
198 				(tm->tm_hour & RTC_AL_HOU_MASK));  in mtk_rtc_set_alarm()
200 				(tm->tm_mday & RTC_AL_DOM_MASK));  in mtk_rtc_set_alarm()
202 				(tm->tm_mon & RTC_AL_MTH_MASK));  in mtk_rtc_set_alarm()
204 				(tm->tm_year & RTC_AL_YEA_MASK));  in mtk_rtc_set_alarm()
206 	if (alm->enabled) {  in mtk_rtc_set_alarm()
207 		ret = regmap_bulk_write(rtc->regmap,  in mtk_rtc_set_alarm()
208 					rtc->addr_base + RTC_AL_SEC,  in mtk_rtc_set_alarm()
212 		ret = regmap_write(rtc->regmap, rtc->addr_base + RTC_AL_MASK,  in mtk_rtc_set_alarm()
216 		ret = regmap_update_bits(rtc->regmap,  in mtk_rtc_set_alarm()
217 					 rtc->addr_base + RTC_IRQ_EN,  in mtk_rtc_set_alarm()
223 		ret = regmap_update_bits(rtc->regmap,  in mtk_rtc_set_alarm()
224 					 rtc->addr_base + RTC_IRQ_EN,  in mtk_rtc_set_alarm()
234 	ret = mtk_rtc_write_trigger(rtc);  in mtk_rtc_set_alarm()
236 	mutex_unlock(&rtc->lock);  in mtk_rtc_set_alarm()
250 	struct mt6397_chip *mt6397_chip = dev_get_drvdata(pdev->dev.parent);  in mtk_rtc_probe()
251 	struct mt6397_rtc *rtc;  in mtk_rtc_probe()  local
254 	rtc = devm_kzalloc(&pdev->dev, sizeof(struct mt6397_rtc), GFP_KERNEL);  in mtk_rtc_probe()
255 	if (!rtc)  in mtk_rtc_probe()
256 		return -ENOMEM;  in mtk_rtc_probe()
260 		return -EINVAL;  in mtk_rtc_probe()
261 	rtc->addr_base = res->start;  in mtk_rtc_probe()
263 	rtc->data = of_device_get_match_data(&pdev->dev);  in mtk_rtc_probe()
265 	rtc->irq = platform_get_irq(pdev, 0);  in mtk_rtc_probe()
266 	if (rtc->irq < 0)  in mtk_rtc_probe()
267 		return rtc->irq;  in mtk_rtc_probe()
269 	rtc->regmap = mt6397_chip->regmap;  in mtk_rtc_probe()
270 	mutex_init(&rtc->lock);  in mtk_rtc_probe()
272 	platform_set_drvdata(pdev, rtc);  in mtk_rtc_probe()
274 	rtc->rtc_dev = devm_rtc_allocate_device(&pdev->dev);  in mtk_rtc_probe()
275 	if (IS_ERR(rtc->rtc_dev))  in mtk_rtc_probe()
276 		return PTR_ERR(rtc->rtc_dev);  in mtk_rtc_probe()
278 	ret = devm_request_threaded_irq(&pdev->dev, rtc->irq, NULL,  in mtk_rtc_probe()
281 					"mt6397-rtc", rtc);  in mtk_rtc_probe()
284 		dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n",  in mtk_rtc_probe()
285 			rtc->irq, ret);  in mtk_rtc_probe()
289 	device_init_wakeup(&pdev->dev, 1);  in mtk_rtc_probe()
291 	rtc->rtc_dev->ops = &mtk_rtc_ops;  in mtk_rtc_probe()
292 	rtc->rtc_dev->range_min = RTC_TIMESTAMP_BEGIN_1900;  in mtk_rtc_probe()
293 	rtc->rtc_dev->range_max = mktime64(2027, 12, 31, 23, 59, 59);  in mtk_rtc_probe()
294 	rtc->rtc_dev->start_secs = mktime64(1968, 1, 2, 0, 0, 0);  in mtk_rtc_probe()
295 	rtc->rtc_dev->set_start_time = true;  in mtk_rtc_probe()
297 	return devm_rtc_register_device(rtc->rtc_dev);  in mtk_rtc_probe()
303 	struct mt6397_rtc *rtc = dev_get_drvdata(dev);  in mt6397_rtc_suspend()  local
306 		enable_irq_wake(rtc->irq);  in mt6397_rtc_suspend()
313 	struct mt6397_rtc *rtc = dev_get_drvdata(dev);  in mt6397_rtc_resume()  local
316 		disable_irq_wake(rtc->irq);  in mt6397_rtc_resume()
334 	{ .compatible = "mediatek,mt6323-rtc", .data = &mt6397_rtc_data },
335 	{ .compatible = "mediatek,mt6358-rtc", .data = &mt6358_rtc_data },
336 	{ .compatible = "mediatek,mt6397-rtc", .data = &mt6397_rtc_data },
343 		.name = "mt6397-rtc",
354 MODULE_DESCRIPTION("RTC Driver for MediaTek MT6397 PMIC");