1 // SPDX-License-Identifier: GPL-2.0
3  * RTC driver for Nuvoton MA35D1
16 #include <linux/rtc.h>
18 /* MA35D1 RTC Control Registers */
62 	return __raw_readl(p->rtc_reg + offset);  in rtc_reg_read()
67 	__raw_writel(value, p->rtc_reg + offset);  in rtc_reg_write()
72 	struct ma35_rtc *rtc = (struct ma35_rtc *)data;  in ma35d1_rtc_interrupt()  local
75 	rtc_irq = rtc_reg_read(rtc, MA35_REG_RTC_INTSTS);  in ma35d1_rtc_interrupt()
78 		rtc_reg_write(rtc, MA35_REG_RTC_INTSTS, RTC_INTSTS_ALMIF);  in ma35d1_rtc_interrupt()
82 	rtc_update_irq(rtc->rtcdev, 1, events);  in ma35d1_rtc_interrupt()
87 static int ma35d1_rtc_init(struct ma35_rtc *rtc, u32 ms_timeout)  in ma35d1_rtc_init()  argument
92 		if (rtc_reg_read(rtc, MA35_REG_RTC_INIT) & RTC_INIT_ACTIVE)  in ma35d1_rtc_init()
95 		rtc_reg_write(rtc, MA35_REG_RTC_INIT, RTC_INIT_MAGIC_CODE);  in ma35d1_rtc_init()
101 	return -ETIMEDOUT;  in ma35d1_rtc_init()
106 	struct ma35_rtc *rtc = dev_get_drvdata(dev);  in ma35d1_alarm_irq_enable()  local
109 	reg_ien = rtc_reg_read(rtc, MA35_REG_RTC_INTEN);  in ma35d1_alarm_irq_enable()
112 		rtc_reg_write(rtc, MA35_REG_RTC_INTEN, reg_ien | RTC_INTEN_ALMIEN);  in ma35d1_alarm_irq_enable()
114 		rtc_reg_write(rtc, MA35_REG_RTC_INTEN, reg_ien & ~RTC_INTEN_ALMIEN);  in ma35d1_alarm_irq_enable()
121 	struct ma35_rtc *rtc = dev_get_drvdata(dev);  in ma35d1_rtc_read_time()  local
125 		time = rtc_reg_read(rtc, MA35_REG_RTC_TIME);  in ma35d1_rtc_read_time()
126 		cal  = rtc_reg_read(rtc, MA35_REG_RTC_CAL);  in ma35d1_rtc_read_time()
127 		wday = rtc_reg_read(rtc, MA35_REG_RTC_WEEKDAY);  in ma35d1_rtc_read_time()
128 	} while (time != rtc_reg_read(rtc, MA35_REG_RTC_TIME) ||  in ma35d1_rtc_read_time()
129 		 cal != rtc_reg_read(rtc, MA35_REG_RTC_CAL));  in ma35d1_rtc_read_time()
131 	tm->tm_mday = bcd2bin(cal >> 0);  in ma35d1_rtc_read_time()
132 	tm->tm_wday = wday;  in ma35d1_rtc_read_time()
133 	tm->tm_mon = bcd2bin(cal >> 8);  in ma35d1_rtc_read_time()
134 	tm->tm_mon = tm->tm_mon - 1;  in ma35d1_rtc_read_time()
135 	tm->tm_year = bcd2bin(cal >> 16) + 100;  in ma35d1_rtc_read_time()
137 	tm->tm_sec = bcd2bin(time >> 0);  in ma35d1_rtc_read_time()
138 	tm->tm_min = bcd2bin(time >> 8);  in ma35d1_rtc_read_time()
139 	tm->tm_hour = bcd2bin(time >> 16);  in ma35d1_rtc_read_time()
146 	struct ma35_rtc *rtc = dev_get_drvdata(dev);  in ma35d1_rtc_set_time()  local
149 	val = bin2bcd(tm->tm_mday) << 0 | bin2bcd(tm->tm_mon + 1) << 8 |  in ma35d1_rtc_set_time()
150 	      bin2bcd(tm->tm_year - 100) << 16;  in ma35d1_rtc_set_time()
151 	rtc_reg_write(rtc, MA35_REG_RTC_CAL, val);  in ma35d1_rtc_set_time()
153 	val = bin2bcd(tm->tm_sec) << 0 | bin2bcd(tm->tm_min) << 8 |  in ma35d1_rtc_set_time()
154 	      bin2bcd(tm->tm_hour) << 16;  in ma35d1_rtc_set_time()
155 	rtc_reg_write(rtc, MA35_REG_RTC_TIME, val);  in ma35d1_rtc_set_time()
157 	val = tm->tm_wday;  in ma35d1_rtc_set_time()
158 	rtc_reg_write(rtc, MA35_REG_RTC_WEEKDAY, val);  in ma35d1_rtc_set_time()
165 	struct ma35_rtc *rtc = dev_get_drvdata(dev);  in ma35d1_rtc_read_alarm()  local
168 	talm = rtc_reg_read(rtc, MA35_REG_RTC_TALM);  in ma35d1_rtc_read_alarm()
169 	calm = rtc_reg_read(rtc, MA35_REG_RTC_CALM);  in ma35d1_rtc_read_alarm()
171 	alrm->time.tm_mday = bcd2bin(calm >> 0);  in ma35d1_rtc_read_alarm()
172 	alrm->time.tm_mon = bcd2bin(calm >> 8);  in ma35d1_rtc_read_alarm()
173 	alrm->time.tm_mon = alrm->time.tm_mon - 1;  in ma35d1_rtc_read_alarm()
175 	alrm->time.tm_year = bcd2bin(calm >> 16) + 100;  in ma35d1_rtc_read_alarm()
177 	alrm->time.tm_sec = bcd2bin(talm >> 0);  in ma35d1_rtc_read_alarm()
178 	alrm->time.tm_min = bcd2bin(talm >> 8);  in ma35d1_rtc_read_alarm()
179 	alrm->time.tm_hour = bcd2bin(talm >> 16);  in ma35d1_rtc_read_alarm()
181 	return rtc_valid_tm(&alrm->time);  in ma35d1_rtc_read_alarm()
186 	struct ma35_rtc *rtc = dev_get_drvdata(dev);  in ma35d1_rtc_set_alarm()  local
189 	val = bin2bcd(alrm->time.tm_mday) << 0 | bin2bcd(alrm->time.tm_mon + 1) << 8 |  in ma35d1_rtc_set_alarm()
190 	      bin2bcd(alrm->time.tm_year - 100) << 16;  in ma35d1_rtc_set_alarm()
191 	rtc_reg_write(rtc, MA35_REG_RTC_CALM, val);  in ma35d1_rtc_set_alarm()
193 	val = bin2bcd(alrm->time.tm_sec) << 0 | bin2bcd(alrm->time.tm_min) << 8 |  in ma35d1_rtc_set_alarm()
194 	      bin2bcd(alrm->time.tm_hour) << 16;  in ma35d1_rtc_set_alarm()
195 	rtc_reg_write(rtc, MA35_REG_RTC_TALM, val);  in ma35d1_rtc_set_alarm()
197 	ma35d1_alarm_irq_enable(dev, alrm->enabled);  in ma35d1_rtc_set_alarm()
212 	struct ma35_rtc *rtc;  in ma35d1_rtc_probe()  local
216 	rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);  in ma35d1_rtc_probe()
217 	if (!rtc)  in ma35d1_rtc_probe()
218 		return -ENOMEM;  in ma35d1_rtc_probe()
220 	rtc->rtc_reg = devm_platform_ioremap_resource(pdev, 0);  in ma35d1_rtc_probe()
221 	if (IS_ERR(rtc->rtc_reg))  in ma35d1_rtc_probe()
222 		return PTR_ERR(rtc->rtc_reg);  in ma35d1_rtc_probe()
224 	clk = of_clk_get(pdev->dev.of_node, 0);  in ma35d1_rtc_probe()
226 		return dev_err_probe(&pdev->dev, PTR_ERR(clk), "failed to find rtc clock\n");  in ma35d1_rtc_probe()
232 	if (!(rtc_reg_read(rtc, MA35_REG_RTC_INIT) & RTC_INIT_ACTIVE)) {  in ma35d1_rtc_probe()
233 		ret = ma35d1_rtc_init(rtc, RTC_INIT_TIMEOUT);  in ma35d1_rtc_probe()
235 			return dev_err_probe(&pdev->dev, ret, "rtc init failed\n");  in ma35d1_rtc_probe()
238 	rtc->irq_num = platform_get_irq(pdev, 0);  in ma35d1_rtc_probe()
240 	ret = devm_request_irq(&pdev->dev, rtc->irq_num, ma35d1_rtc_interrupt,  in ma35d1_rtc_probe()
241 			       IRQF_NO_SUSPEND, "ma35d1rtc", rtc);  in ma35d1_rtc_probe()
243 		return dev_err_probe(&pdev->dev, ret, "Failed to request rtc irq\n");  in ma35d1_rtc_probe()
245 	platform_set_drvdata(pdev, rtc);  in ma35d1_rtc_probe()
247 	device_init_wakeup(&pdev->dev, true);  in ma35d1_rtc_probe()
249 	rtc->rtcdev = devm_rtc_allocate_device(&pdev->dev);  in ma35d1_rtc_probe()
250 	if (IS_ERR(rtc->rtcdev))  in ma35d1_rtc_probe()
251 		return PTR_ERR(rtc->rtcdev);  in ma35d1_rtc_probe()
253 	rtc->rtcdev->ops = &ma35d1_rtc_ops;  in ma35d1_rtc_probe()
254 	rtc->rtcdev->range_min = RTC_TIMESTAMP_BEGIN_2000;  in ma35d1_rtc_probe()
255 	rtc->rtcdev->range_max = RTC_TIMESTAMP_END_2099;  in ma35d1_rtc_probe()
257 	ret = devm_rtc_register_device(rtc->rtcdev);  in ma35d1_rtc_probe()
259 		return dev_err_probe(&pdev->dev, ret, "Failed to register rtc device\n");  in ma35d1_rtc_probe()
266 	struct ma35_rtc *rtc = platform_get_drvdata(pdev);  in ma35d1_rtc_suspend()  local
268 	if (device_may_wakeup(&pdev->dev))  in ma35d1_rtc_suspend()
269 		enable_irq_wake(rtc->irq_num);  in ma35d1_rtc_suspend()
276 	struct ma35_rtc *rtc = platform_get_drvdata(pdev);  in ma35d1_rtc_resume()  local
278 	if (device_may_wakeup(&pdev->dev))  in ma35d1_rtc_resume()
279 		disable_irq_wake(rtc->irq_num);  in ma35d1_rtc_resume()
285 	{ .compatible = "nuvoton,ma35d1-rtc", },
295 		.name	= "rtc-ma35d1",
302 MODULE_AUTHOR("Ming-Jen Chen <mjchen@nuvoton.com>");
303 MODULE_DESCRIPTION("MA35D1 RTC driver");