114 	void (*clear_events)(struct stm32_rtc *rtc, unsigned int flags);
133 static void stm32_rtc_wpr_unlock(struct stm32_rtc *rtc)  in stm32_rtc_wpr_unlock()  argument
135 	const struct stm32_rtc_registers *regs = &rtc->data->regs;  in stm32_rtc_wpr_unlock()
137 	writel_relaxed(RTC_WPR_1ST_KEY, rtc->base + regs->wpr);  in stm32_rtc_wpr_unlock()
138 	writel_relaxed(RTC_WPR_2ND_KEY, rtc->base + regs->wpr);  in stm32_rtc_wpr_unlock()
141 static void stm32_rtc_wpr_lock(struct stm32_rtc *rtc)  in stm32_rtc_wpr_lock()  argument
143 	const struct stm32_rtc_registers *regs = &rtc->data->regs;  in stm32_rtc_wpr_lock()
145 	writel_relaxed(RTC_WPR_WRONG_KEY, rtc->base + regs->wpr);  in stm32_rtc_wpr_lock()
148 static int stm32_rtc_enter_init_mode(struct stm32_rtc *rtc)  in stm32_rtc_enter_init_mode()  argument
150 	const struct stm32_rtc_registers *regs = &rtc->data->regs;  in stm32_rtc_enter_init_mode()
151 	unsigned int isr = readl_relaxed(rtc->base + regs->isr);  in stm32_rtc_enter_init_mode()
155 		writel_relaxed(isr, rtc->base + regs->isr);  in stm32_rtc_enter_init_mode()
164 					rtc->base + regs->isr,  in stm32_rtc_enter_init_mode()
172 static void stm32_rtc_exit_init_mode(struct stm32_rtc *rtc)  in stm32_rtc_exit_init_mode()  argument
174 	const struct stm32_rtc_registers *regs = &rtc->data->regs;  in stm32_rtc_exit_init_mode()
175 	unsigned int isr = readl_relaxed(rtc->base + regs->isr);  in stm32_rtc_exit_init_mode()
178 	writel_relaxed(isr, rtc->base + regs->isr);  in stm32_rtc_exit_init_mode()
181 static int stm32_rtc_wait_sync(struct stm32_rtc *rtc)  in stm32_rtc_wait_sync()  argument
183 	const struct stm32_rtc_registers *regs = &rtc->data->regs;  in stm32_rtc_wait_sync()
184 	unsigned int isr = readl_relaxed(rtc->base + regs->isr);  in stm32_rtc_wait_sync()
187 	writel_relaxed(isr, rtc->base + regs->isr);  in stm32_rtc_wait_sync()
193 	return readl_relaxed_poll_timeout_atomic(rtc->base + regs->isr,  in stm32_rtc_wait_sync()
199 static void stm32_rtc_clear_event_flags(struct stm32_rtc *rtc,  in stm32_rtc_clear_event_flags()  argument
202 	rtc->data->clear_events(rtc, flags);  in stm32_rtc_clear_event_flags()
207 	struct stm32_rtc *rtc = (struct stm32_rtc *)dev_id;  in stm32_rtc_alarm_irq()  local
208 	const struct stm32_rtc_registers *regs = &rtc->data->regs;  in stm32_rtc_alarm_irq()
209 	const struct stm32_rtc_events *evts = &rtc->data->events;  in stm32_rtc_alarm_irq()
212 	mutex_lock(&rtc->rtc_dev->ops_lock);  in stm32_rtc_alarm_irq()
214 	status = readl_relaxed(rtc->base + regs->sr);  in stm32_rtc_alarm_irq()
215 	cr = readl_relaxed(rtc->base + regs->cr);  in stm32_rtc_alarm_irq()
220 		dev_dbg(&rtc->rtc_dev->dev, "Alarm occurred\n");  in stm32_rtc_alarm_irq()
223 		rtc_update_irq(rtc->rtc_dev, 1, RTC_IRQF | RTC_AF);  in stm32_rtc_alarm_irq()
226 		stm32_rtc_clear_event_flags(rtc, evts->alra);  in stm32_rtc_alarm_irq()
229 	mutex_unlock(&rtc->rtc_dev->ops_lock);  in stm32_rtc_alarm_irq()
272 	struct stm32_rtc *rtc = dev_get_drvdata(dev);  in stm32_rtc_read_time()  local
273 	const struct stm32_rtc_registers *regs = &rtc->data->regs;  in stm32_rtc_read_time()
277 	tr = readl_relaxed(rtc->base + regs->tr);  in stm32_rtc_read_time()
278 	dr = readl_relaxed(rtc->base + regs->dr);  in stm32_rtc_read_time()
298 	struct stm32_rtc *rtc = dev_get_drvdata(dev);  in stm32_rtc_set_time()  local
299 	const struct stm32_rtc_registers *regs = &rtc->data->regs;  in stm32_rtc_set_time()
316 	stm32_rtc_wpr_unlock(rtc);  in stm32_rtc_set_time()
318 	ret = stm32_rtc_enter_init_mode(rtc);  in stm32_rtc_set_time()
324 	writel_relaxed(tr, rtc->base + regs->tr);  in stm32_rtc_set_time()
325 	writel_relaxed(dr, rtc->base + regs->dr);  in stm32_rtc_set_time()
327 	stm32_rtc_exit_init_mode(rtc);  in stm32_rtc_set_time()
329 	ret = stm32_rtc_wait_sync(rtc);  in stm32_rtc_set_time()
331 	stm32_rtc_wpr_lock(rtc);  in stm32_rtc_set_time()
338 	struct stm32_rtc *rtc = dev_get_drvdata(dev);  in stm32_rtc_read_alarm()  local
339 	const struct stm32_rtc_registers *regs = &rtc->data->regs;  in stm32_rtc_read_alarm()
340 	const struct stm32_rtc_events *evts = &rtc->data->events;  in stm32_rtc_read_alarm()
344 	alrmar = readl_relaxed(rtc->base + regs->alrmar);  in stm32_rtc_read_alarm()
345 	cr = readl_relaxed(rtc->base + regs->cr);  in stm32_rtc_read_alarm()
346 	status = readl_relaxed(rtc->base + regs->sr);  in stm32_rtc_read_alarm()
406 	struct stm32_rtc *rtc = dev_get_drvdata(dev);  in stm32_rtc_alarm_irq_enable()  local
407 	const struct stm32_rtc_registers *regs = &rtc->data->regs;  in stm32_rtc_alarm_irq_enable()
408 	const struct stm32_rtc_events *evts = &rtc->data->events;  in stm32_rtc_alarm_irq_enable()
411 	cr = readl_relaxed(rtc->base + regs->cr);  in stm32_rtc_alarm_irq_enable()
413 	stm32_rtc_wpr_unlock(rtc);  in stm32_rtc_alarm_irq_enable()
420 	writel_relaxed(cr, rtc->base + regs->cr);  in stm32_rtc_alarm_irq_enable()
423 	stm32_rtc_clear_event_flags(rtc, evts->alra);  in stm32_rtc_alarm_irq_enable()
425 	stm32_rtc_wpr_lock(rtc);  in stm32_rtc_alarm_irq_enable()
430 static int stm32_rtc_valid_alrm(struct stm32_rtc *rtc, struct rtc_time *tm)  in stm32_rtc_valid_alrm()  argument
432 	const struct stm32_rtc_registers *regs = &rtc->data->regs;  in stm32_rtc_valid_alrm()
434 	unsigned int dr = readl_relaxed(rtc->base + regs->dr);  in stm32_rtc_valid_alrm()
435 	unsigned int tr = readl_relaxed(rtc->base + regs->tr);  in stm32_rtc_valid_alrm()
468 	struct stm32_rtc *rtc = dev_get_drvdata(dev);  in stm32_rtc_set_alarm()  local
469 	const struct stm32_rtc_registers *regs = &rtc->data->regs;  in stm32_rtc_set_alarm()
480 	if (stm32_rtc_valid_alrm(rtc, tm) < 0) {  in stm32_rtc_set_alarm()
498 	stm32_rtc_wpr_unlock(rtc);  in stm32_rtc_set_alarm()
501 	cr = readl_relaxed(rtc->base + regs->cr);  in stm32_rtc_set_alarm()
503 	writel_relaxed(cr, rtc->base + regs->cr);  in stm32_rtc_set_alarm()
509 	ret = readl_relaxed_poll_timeout_atomic(rtc->base + regs->isr,  in stm32_rtc_set_alarm()
520 	writel_relaxed(alrmar, rtc->base + regs->alrmar);  in stm32_rtc_set_alarm()
528 	stm32_rtc_wpr_lock(rtc);  in stm32_rtc_set_alarm()
541 static void stm32_rtc_clear_events(struct stm32_rtc *rtc,  in stm32_rtc_clear_events()  argument
544 	const struct stm32_rtc_registers *regs = &rtc->data->regs;  in stm32_rtc_clear_events()
547 	writel_relaxed(readl_relaxed(rtc->base + regs->isr) & ~flags,  in stm32_rtc_clear_events()
548 		       rtc->base + regs->isr);  in stm32_rtc_clear_events()
595 static void stm32mp1_rtc_clear_events(struct stm32_rtc *rtc,  in stm32mp1_rtc_clear_events()  argument
598 	struct stm32_rtc_registers regs = rtc->data->regs;  in stm32mp1_rtc_clear_events()
601 	writel_relaxed(flags, rtc->base + regs.scr);  in stm32mp1_rtc_clear_events()
635 			  struct stm32_rtc *rtc)  in stm32_rtc_init()  argument
637 	const struct stm32_rtc_registers *regs = &rtc->data->regs;  in stm32_rtc_init()
642 	rate = clk_get_rate(rtc->rtc_ck);  in stm32_rtc_init()
668 	stm32_rtc_wpr_unlock(rtc);  in stm32_rtc_init()
670 	ret = stm32_rtc_enter_init_mode(rtc);  in stm32_rtc_init()
678 	writel_relaxed(prer, rtc->base + regs->prer);  in stm32_rtc_init()
680 	writel_relaxed(prer, rtc->base + regs->prer);  in stm32_rtc_init()
683 	cr = readl_relaxed(rtc->base + regs->cr);  in stm32_rtc_init()
685 	writel_relaxed(cr, rtc->base + regs->cr);  in stm32_rtc_init()
687 	stm32_rtc_exit_init_mode(rtc);  in stm32_rtc_init()
689 	ret = stm32_rtc_wait_sync(rtc);  in stm32_rtc_init()
691 	stm32_rtc_wpr_lock(rtc);  in stm32_rtc_init()
698 	struct stm32_rtc *rtc;  in stm32_rtc_probe()  local
703 	rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);  in stm32_rtc_probe()
704 	if (!rtc)  in stm32_rtc_probe()
708 	rtc->base = devm_ioremap_resource(&pdev->dev, res);  in stm32_rtc_probe()
709 	if (IS_ERR(rtc->base))  in stm32_rtc_probe()
710 		return PTR_ERR(rtc->base);  in stm32_rtc_probe()
712 	rtc->data = (struct stm32_rtc_data *)  in stm32_rtc_probe()
714 	regs = &rtc->data->regs;  in stm32_rtc_probe()
716 	if (rtc->data->need_dbp) {  in stm32_rtc_probe()
717 		rtc->dbp = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,  in stm32_rtc_probe()
719 		if (IS_ERR(rtc->dbp)) {  in stm32_rtc_probe()
721 			return PTR_ERR(rtc->dbp);  in stm32_rtc_probe()
725 						 1, &rtc->dbp_reg);  in stm32_rtc_probe()
732 						 2, &rtc->dbp_mask);  in stm32_rtc_probe()
739 	if (!rtc->data->has_pclk) {  in stm32_rtc_probe()
740 		rtc->pclk = NULL;  in stm32_rtc_probe()
741 		rtc->rtc_ck = devm_clk_get(&pdev->dev, NULL);  in stm32_rtc_probe()
743 		rtc->pclk = devm_clk_get(&pdev->dev, "pclk");  in stm32_rtc_probe()
744 		if (IS_ERR(rtc->pclk)) {  in stm32_rtc_probe()
746 			return PTR_ERR(rtc->pclk);  in stm32_rtc_probe()
748 		rtc->rtc_ck = devm_clk_get(&pdev->dev, "rtc_ck");  in stm32_rtc_probe()
750 	if (IS_ERR(rtc->rtc_ck)) {  in stm32_rtc_probe()
752 		return PTR_ERR(rtc->rtc_ck);  in stm32_rtc_probe()
755 	if (rtc->data->has_pclk) {  in stm32_rtc_probe()
756 		ret = clk_prepare_enable(rtc->pclk);  in stm32_rtc_probe()
761 	ret = clk_prepare_enable(rtc->rtc_ck);  in stm32_rtc_probe()
765 	if (rtc->data->need_dbp)  in stm32_rtc_probe()
766 		regmap_update_bits(rtc->dbp, rtc->dbp_reg,  in stm32_rtc_probe()
767 				   rtc->dbp_mask, rtc->dbp_mask);  in stm32_rtc_probe()
777 	ret = stm32_rtc_init(pdev, rtc);  in stm32_rtc_probe()
781 	rtc->irq_alarm = platform_get_irq(pdev, 0);  in stm32_rtc_probe()
782 	if (rtc->irq_alarm <= 0) {  in stm32_rtc_probe()
784 		ret = rtc->irq_alarm;  in stm32_rtc_probe()
789 	if (rtc->data->has_wakeirq) {  in stm32_rtc_probe()
790 		rtc->wakeirq_alarm = platform_get_irq(pdev, 1);  in stm32_rtc_probe()
791 		if (rtc->wakeirq_alarm <= 0)  in stm32_rtc_probe()
792 			ret = rtc->wakeirq_alarm;  in stm32_rtc_probe()
795 							    rtc->wakeirq_alarm);  in stm32_rtc_probe()
800 	platform_set_drvdata(pdev, rtc);  in stm32_rtc_probe()
802 	rtc->rtc_dev = devm_rtc_device_register(&pdev->dev, pdev->name,  in stm32_rtc_probe()
804 	if (IS_ERR(rtc->rtc_dev)) {  in stm32_rtc_probe()
805 		ret = PTR_ERR(rtc->rtc_dev);  in stm32_rtc_probe()
812 	ret = devm_request_threaded_irq(&pdev->dev, rtc->irq_alarm, NULL,  in stm32_rtc_probe()
814 					pdev->name, rtc);  in stm32_rtc_probe()
817 			rtc->irq_alarm);  in stm32_rtc_probe()
825 	if (!(readl_relaxed(rtc->base + regs->isr) & STM32_RTC_ISR_INITS))  in stm32_rtc_probe()
829 		u32 ver = readl_relaxed(rtc->base + regs->verr);  in stm32_rtc_probe()
838 	if (rtc->data->has_pclk)  in stm32_rtc_probe()
839 		clk_disable_unprepare(rtc->pclk);  in stm32_rtc_probe()
840 	clk_disable_unprepare(rtc->rtc_ck);  in stm32_rtc_probe()
842 	if (rtc->data->need_dbp)  in stm32_rtc_probe()
843 		regmap_update_bits(rtc->dbp, rtc->dbp_reg, rtc->dbp_mask, 0);  in stm32_rtc_probe()
853 	struct stm32_rtc *rtc = platform_get_drvdata(pdev);  in stm32_rtc_remove()  local
854 	const struct stm32_rtc_registers *regs = &rtc->data->regs;  in stm32_rtc_remove()
858 	stm32_rtc_wpr_unlock(rtc);  in stm32_rtc_remove()
859 	cr = readl_relaxed(rtc->base + regs->cr);  in stm32_rtc_remove()
861 	writel_relaxed(cr, rtc->base + regs->cr);  in stm32_rtc_remove()
862 	stm32_rtc_wpr_lock(rtc);  in stm32_rtc_remove()
864 	clk_disable_unprepare(rtc->rtc_ck);  in stm32_rtc_remove()
865 	if (rtc->data->has_pclk)  in stm32_rtc_remove()
866 		clk_disable_unprepare(rtc->pclk);  in stm32_rtc_remove()
869 	if (rtc->data->need_dbp)  in stm32_rtc_remove()
870 		regmap_update_bits(rtc->dbp, rtc->dbp_reg, rtc->dbp_mask, 0);  in stm32_rtc_remove()
881 	struct stm32_rtc *rtc = dev_get_drvdata(dev);  in stm32_rtc_suspend()  local
883 	if (rtc->data->has_pclk)  in stm32_rtc_suspend()
884 		clk_disable_unprepare(rtc->pclk);  in stm32_rtc_suspend()
887 		return enable_irq_wake(rtc->irq_alarm);  in stm32_rtc_suspend()
894 	struct stm32_rtc *rtc = dev_get_drvdata(dev);  in stm32_rtc_resume()  local
897 	if (rtc->data->has_pclk) {  in stm32_rtc_resume()
898 		ret = clk_prepare_enable(rtc->pclk);  in stm32_rtc_resume()
903 	ret = stm32_rtc_wait_sync(rtc);  in stm32_rtc_resume()
908 		return disable_irq_wake(rtc->irq_alarm);  in stm32_rtc_resume()