1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * Driver for MediaTek SoC based RTC
14 #include <linux/rtc.h>
49  * Ranges from 0x40 to 0x78 provide RTC time setup for year, month,
65  * The lowest value for the valid tm_year. RTC hardware would take incorrectly
72  * The most year the RTC can hold is 99 and the next to 99 in year register
84 /* Types of the function the RTC provides are time counter and alarm. */
102 	struct rtc_device *rtc;  member
108 static void mtk_w32(struct mtk_rtc *rtc, u32 reg, u32 val)  in mtk_w32()  argument
110 	writel_relaxed(val, rtc->base + reg);  in mtk_w32()
113 static u32 mtk_r32(struct mtk_rtc *rtc, u32 reg)  in mtk_r32()  argument
115 	return readl_relaxed(rtc->base + reg);  in mtk_r32()
118 static void mtk_rmw(struct mtk_rtc *rtc, u32 reg, u32 mask, u32 set)  in mtk_rmw()  argument
122 	val = mtk_r32(rtc, reg);  in mtk_rmw()
125 	mtk_w32(rtc, reg, val);  in mtk_rmw()
128 static void mtk_set(struct mtk_rtc *rtc, u32 reg, u32 val)  in mtk_set()  argument
130 	mtk_rmw(rtc, reg, 0, val);  in mtk_set()
133 static void mtk_clr(struct mtk_rtc *rtc, u32 reg, u32 val)  in mtk_clr()  argument
135 	mtk_rmw(rtc, reg, val, 0);  in mtk_clr()
140 	/* The setup of the init sequence is for allowing RTC got to work */  in mtk_rtc_hw_init()
173 	tm->tm_sec  = sec;  in mtk_rtc_get_alarm_or_time()
174 	tm->tm_min  = min;  in mtk_rtc_get_alarm_or_time()
175 	tm->tm_hour = hour;  in mtk_rtc_get_alarm_or_time()
176 	tm->tm_wday = wday;  in mtk_rtc_get_alarm_or_time()
177 	tm->tm_mday = mday;  in mtk_rtc_get_alarm_or_time()
178 	tm->tm_mon  = mon - 1;  in mtk_rtc_get_alarm_or_time()
181 	tm->tm_year = year + MTK_RTC_TM_YR_OFFSET;  in mtk_rtc_get_alarm_or_time()
189 	/* Rebase to the relative year which RTC hardware requires */  in mtk_rtc_set_alarm_or_time()
190 	year = tm->tm_year - MTK_RTC_TM_YR_OFFSET;  in mtk_rtc_set_alarm_or_time()
193 	mtk_w32(hw, MTK_RTC_TREG(time_alarm, MTK_MON), tm->tm_mon + 1);  in mtk_rtc_set_alarm_or_time()
194 	mtk_w32(hw, MTK_RTC_TREG(time_alarm, MTK_DOW), tm->tm_wday);  in mtk_rtc_set_alarm_or_time()
195 	mtk_w32(hw, MTK_RTC_TREG(time_alarm, MTK_DOM), tm->tm_mday);  in mtk_rtc_set_alarm_or_time()
196 	mtk_w32(hw, MTK_RTC_TREG(time_alarm, MTK_HOU), tm->tm_hour);  in mtk_rtc_set_alarm_or_time()
197 	mtk_w32(hw, MTK_RTC_TREG(time_alarm, MTK_MIN), tm->tm_min);  in mtk_rtc_set_alarm_or_time()
198 	mtk_w32(hw, MTK_RTC_TREG(time_alarm, MTK_SEC), tm->tm_sec);  in mtk_rtc_set_alarm_or_time()
210 		rtc_update_irq(hw->rtc, 1, RTC_IRQF | RTC_AF);  in mtk_rtc_alarmirq()
233 	if (!MTK_RTC_TM_YR_VALID(tm->tm_year))  in mtk_rtc_settime()
234 		return -EINVAL;  in mtk_rtc_settime()
250 	struct rtc_time *alrm_tm = &wkalrm->time;  in mtk_rtc_getalarm()
254 	wkalrm->enabled = !!(mtk_r32(hw, MTK_RTC_AL_CTL) & RTC_AL_EN);  in mtk_rtc_getalarm()
255 	wkalrm->pending = !!(mtk_r32(hw, MTK_RTC_INT) & RTC_INT_AL_STA);  in mtk_rtc_getalarm()
263 	struct rtc_time *alrm_tm = &wkalrm->time;  in mtk_rtc_setalarm()
265 	if (!MTK_RTC_TM_YR_VALID(alrm_tm->tm_year))  in mtk_rtc_setalarm()
266 		return -EINVAL;  in mtk_rtc_setalarm()
279 	synchronize_irq(hw->irq);  in mtk_rtc_setalarm()
297 	{ .compatible = "mediatek,mt7622-rtc" },
298 	{ .compatible = "mediatek,soc-rtc" },
308 	hw = devm_kzalloc(&pdev->dev, sizeof(*hw), GFP_KERNEL);  in mtk_rtc_probe()
310 		return -ENOMEM;  in mtk_rtc_probe()
314 	hw->base = devm_platform_ioremap_resource(pdev, 0);  in mtk_rtc_probe()
315 	if (IS_ERR(hw->base))  in mtk_rtc_probe()
316 		return PTR_ERR(hw->base);  in mtk_rtc_probe()
318 	hw->clk = devm_clk_get(&pdev->dev, "rtc");  in mtk_rtc_probe()
319 	if (IS_ERR(hw->clk)) {  in mtk_rtc_probe()
320 		dev_err(&pdev->dev, "No clock\n");  in mtk_rtc_probe()
321 		return PTR_ERR(hw->clk);  in mtk_rtc_probe()
324 	ret = clk_prepare_enable(hw->clk);  in mtk_rtc_probe()
328 	hw->irq = platform_get_irq(pdev, 0);  in mtk_rtc_probe()
329 	if (hw->irq < 0) {  in mtk_rtc_probe()
330 		ret = hw->irq;  in mtk_rtc_probe()
334 	ret = devm_request_irq(&pdev->dev, hw->irq, mtk_rtc_alarmirq,  in mtk_rtc_probe()
335 			       0, dev_name(&pdev->dev), hw);  in mtk_rtc_probe()
337 		dev_err(&pdev->dev, "Can't request IRQ\n");  in mtk_rtc_probe()
343 	device_init_wakeup(&pdev->dev, true);  in mtk_rtc_probe()
345 	hw->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,  in mtk_rtc_probe()
347 	if (IS_ERR(hw->rtc)) {  in mtk_rtc_probe()
348 		ret = PTR_ERR(hw->rtc);  in mtk_rtc_probe()
349 		dev_err(&pdev->dev, "Unable to register device\n");  in mtk_rtc_probe()
355 	clk_disable_unprepare(hw->clk);  in mtk_rtc_probe()
364 	clk_disable_unprepare(hw->clk);  in mtk_rtc_remove()
373 		enable_irq_wake(hw->irq);  in mtk_rtc_suspend()
383 		disable_irq_wake(hw->irq);  in mtk_rtc_resume()
407 MODULE_DESCRIPTION("MediaTek SoC based RTC Driver");