1 // SPDX-License-Identifier: GPL-2.0
3  * Copyright (C) 2007-2009 ST-Ericsson AB
4  * Real Time Clock interface for ST-Ericsson AB COH 901 331 RTC.
6  * Based on rtc-pl031.c by Deepak Saxena <dsaxena@plexity.net>
27 /* Indication if current time is valid 32bit (R/-) */
29 /* Read the current time 32bit (R/-) */
58 	clk_enable(rtap->clk);  in coh901331_interrupt()
60 	writel(1, rtap->virtbase + COH901331_IRQ_EVENT);  in coh901331_interrupt()
63 	 * the RTC lives on a lower-clocked line and will  in coh901331_interrupt()
65 	 * clock cycles. The interrupt will be re-enabled when  in coh901331_interrupt()
68 	writel(0, rtap->virtbase + COH901331_IRQ_MASK);  in coh901331_interrupt()
69 	clk_disable(rtap->clk);  in coh901331_interrupt()
72 	rtc_update_irq(rtap->rtc, 1, RTC_AF);  in coh901331_interrupt()
81 	clk_enable(rtap->clk);  in coh901331_read_time()
83 	if (!readl(rtap->virtbase + COH901331_VALID)) {  in coh901331_read_time()
84 		clk_disable(rtap->clk);  in coh901331_read_time()
85 		return -EINVAL;  in coh901331_read_time()
88 	rtc_time64_to_tm(readl(rtap->virtbase + COH901331_CUR_TIME), tm);  in coh901331_read_time()
89 	clk_disable(rtap->clk);  in coh901331_read_time()
97 	clk_enable(rtap->clk);  in coh901331_set_time()
98 	writel(rtc_tm_to_time64(tm), rtap->virtbase + COH901331_SET_TIME);  in coh901331_set_time()
99 	clk_disable(rtap->clk);  in coh901331_set_time()
108 	clk_enable(rtap->clk);  in coh901331_read_alarm()
109 	rtc_time64_to_tm(readl(rtap->virtbase + COH901331_ALARM), &alarm->time);  in coh901331_read_alarm()
110 	alarm->pending = readl(rtap->virtbase + COH901331_IRQ_EVENT) & 1U;  in coh901331_read_alarm()
111 	alarm->enabled = readl(rtap->virtbase + COH901331_IRQ_MASK) & 1U;  in coh901331_read_alarm()
112 	clk_disable(rtap->clk);  in coh901331_read_alarm()
120 	unsigned long time =  rtc_tm_to_time64(&alarm->time);  in coh901331_set_alarm()
122 	clk_enable(rtap->clk);  in coh901331_set_alarm()
123 	writel(time, rtap->virtbase + COH901331_ALARM);  in coh901331_set_alarm()
124 	writel(alarm->enabled, rtap->virtbase + COH901331_IRQ_MASK);  in coh901331_set_alarm()
125 	clk_disable(rtap->clk);  in coh901331_set_alarm()
134 	clk_enable(rtap->clk);  in coh901331_alarm_irq_enable()
136 		writel(1, rtap->virtbase + COH901331_IRQ_MASK);  in coh901331_alarm_irq_enable()
138 		writel(0, rtap->virtbase + COH901331_IRQ_MASK);  in coh901331_alarm_irq_enable()
139 	clk_disable(rtap->clk);  in coh901331_alarm_irq_enable()
157 		clk_unprepare(rtap->clk);  in coh901331_remove()
168 	rtap = devm_kzalloc(&pdev->dev,  in coh901331_probe()
171 		return -ENOMEM;  in coh901331_probe()
173 	rtap->virtbase  = devm_platform_ioremap_resource(pdev, 0);  in coh901331_probe()
174 	if (IS_ERR(rtap->virtbase))  in coh901331_probe()
175 		return PTR_ERR(rtap->virtbase);  in coh901331_probe()
177 	rtap->irq = platform_get_irq(pdev, 0);  in coh901331_probe()
178 	if (devm_request_irq(&pdev->dev, rtap->irq, coh901331_interrupt, 0,  in coh901331_probe()
180 		return -EIO;  in coh901331_probe()
182 	rtap->clk = devm_clk_get(&pdev->dev, NULL);  in coh901331_probe()
183 	if (IS_ERR(rtap->clk)) {  in coh901331_probe()
184 		ret = PTR_ERR(rtap->clk);  in coh901331_probe()
185 		dev_err(&pdev->dev, "could not get clock\n");  in coh901331_probe()
189 	rtap->rtc = devm_rtc_allocate_device(&pdev->dev);  in coh901331_probe()
190 	if (IS_ERR(rtap->rtc))  in coh901331_probe()
191 		return PTR_ERR(rtap->rtc);  in coh901331_probe()
193 	rtap->rtc->ops = &coh901331_ops;  in coh901331_probe()
194 	rtap->rtc->range_max = U32_MAX;  in coh901331_probe()
197 	ret = clk_prepare_enable(rtap->clk);  in coh901331_probe()
199 		dev_err(&pdev->dev, "could not enable clock\n");  in coh901331_probe()
202 	clk_disable(rtap->clk);  in coh901331_probe()
206 	ret = rtc_register_device(rtap->rtc);  in coh901331_probe()
213 	clk_unprepare(rtap->clk);  in coh901331_probe()
228 		enable_irq_wake(rtap->irq);  in coh901331_suspend()
230 		clk_enable(rtap->clk);  in coh901331_suspend()
231 		rtap->irqmaskstore = readl(rtap->virtbase + COH901331_IRQ_MASK);  in coh901331_suspend()
232 		writel(0, rtap->virtbase + COH901331_IRQ_MASK);  in coh901331_suspend()
233 		clk_disable(rtap->clk);  in coh901331_suspend()
235 	clk_unprepare(rtap->clk);  in coh901331_suspend()
244 	ret = clk_prepare(rtap->clk);  in coh901331_resume()
249 		disable_irq_wake(rtap->irq);  in coh901331_resume()
251 		clk_enable(rtap->clk);  in coh901331_resume()
252 		writel(rtap->irqmaskstore, rtap->virtbase + COH901331_IRQ_MASK);  in coh901331_resume()
253 		clk_disable(rtap->clk);  in coh901331_resume()
265 	clk_enable(rtap->clk);  in coh901331_shutdown()
266 	writel(0, rtap->virtbase + COH901331_IRQ_MASK);  in coh901331_shutdown()
267 	clk_disable_unprepare(rtap->clk);  in coh901331_shutdown()
278 		.name = "rtc-coh901331",
289 MODULE_DESCRIPTION("ST-Ericsson AB COH 901 331 RTC Driver");