1 // SPDX-License-Identifier: GPL-2.0
3  * Microchip MPFS RTC driver
5  * Copyright (c) 2021-2022 Microchip Corporation. All rights reserved.
20 #include <linux/rtc.h>
57 	struct rtc_device *rtc;  member
65 	ctrl = readl(rtcdev->base + CONTROL_REG);  in mpfs_rtc_start()
68 	writel(ctrl, rtcdev->base + CONTROL_REG);  in mpfs_rtc_start()
73 	u32 val = readl(rtcdev->base + CONTROL_REG);  in mpfs_rtc_clear_irq()
77 	writel(val, rtcdev->base + CONTROL_REG);  in mpfs_rtc_clear_irq()
83 	(void)readl(rtcdev->base + CONTROL_REG);  in mpfs_rtc_clear_irq()
91 	time = readl(rtcdev->base + DATETIME_LOWER_REG);  in mpfs_rtc_readtime()
92 	time |= ((u64)readl(rtcdev->base + DATETIME_UPPER_REG) & DATETIME_UPPER_MASK) << 32;  in mpfs_rtc_readtime()
107 	writel((u32)time, rtcdev->base + DATETIME_LOWER_REG);  in mpfs_rtc_settime()
108 	writel((u32)(time >> 32) & DATETIME_UPPER_MASK, rtcdev->base + DATETIME_UPPER_REG);  in mpfs_rtc_settime()
110 	ctrl = readl(rtcdev->base + CONTROL_REG);  in mpfs_rtc_settime()
113 	writel(ctrl, rtcdev->base + CONTROL_REG);  in mpfs_rtc_settime()
116 				false, rtcdev->base + CONTROL_REG);  in mpfs_rtc_settime()
118 		dev_err(dev, "timed out uploading time to rtc");  in mpfs_rtc_settime()
129 	u32 mode = readl(rtcdev->base + MODE_REG);  in mpfs_rtc_readalarm()
132 	alrm->enabled = mode & MODE_WAKE_EN;  in mpfs_rtc_readalarm()
134 	time = (u64)readl(rtcdev->base + ALARM_LOWER_REG) << 32;  in mpfs_rtc_readalarm()
135 	time |= (readl(rtcdev->base + ALARM_UPPER_REG) & ALARM_UPPER_MASK);  in mpfs_rtc_readalarm()
136 	rtc_time64_to_tm(time, &alrm->time);  in mpfs_rtc_readalarm()
148 	ctrl = readl(rtcdev->base + CONTROL_REG);  in mpfs_rtc_setalarm()
150 	writel(ctrl, rtcdev->base + CONTROL_REG);  in mpfs_rtc_setalarm()
152 	time = rtc_tm_to_time64(&alrm->time);  in mpfs_rtc_setalarm()
154 	writel((u32)time, rtcdev->base + ALARM_LOWER_REG);  in mpfs_rtc_setalarm()
155 	writel((u32)(time >> 32) & ALARM_UPPER_MASK, rtcdev->base + ALARM_UPPER_REG);  in mpfs_rtc_setalarm()
158 	writel(GENMASK(31, 0), rtcdev->base + COMPARE_LOWER_REG);  in mpfs_rtc_setalarm()
159 	writel(GENMASK(29, 0), rtcdev->base + COMPARE_UPPER_REG);  in mpfs_rtc_setalarm()
161 	/* Configure the RTC to enable the alarm. */  in mpfs_rtc_setalarm()
162 	ctrl = readl(rtcdev->base + CONTROL_REG);  in mpfs_rtc_setalarm()
163 	mode = readl(rtcdev->base + MODE_REG);  in mpfs_rtc_setalarm()
164 	if (alrm->enabled) {  in mpfs_rtc_setalarm()
172 	writel(ctrl, rtcdev->base + CONTROL_REG);  in mpfs_rtc_setalarm()
173 	writel(mode, rtcdev->base + MODE_REG);  in mpfs_rtc_setalarm()
183 	ctrl = readl(rtcdev->base + CONTROL_REG);  in mpfs_rtc_alarm_irq_enable()
191 	writel(ctrl, rtcdev->base + CONTROL_REG);  in mpfs_rtc_alarm_irq_enable()
202 	rtc_update_irq(rtcdev->rtc, 1, RTC_IRQF | RTC_AF);  in mpfs_rtc_wakeup_irq_handler()
222 	rtcdev = devm_kzalloc(&pdev->dev, sizeof(struct mpfs_rtc_dev), GFP_KERNEL);  in mpfs_rtc_probe()
224 		return -ENOMEM;  in mpfs_rtc_probe()
228 	rtcdev->rtc = devm_rtc_allocate_device(&pdev->dev);  in mpfs_rtc_probe()
229 	if (IS_ERR(rtcdev->rtc))  in mpfs_rtc_probe()
230 		return PTR_ERR(rtcdev->rtc);  in mpfs_rtc_probe()
232 	rtcdev->rtc->ops = &mpfs_rtc_ops;  in mpfs_rtc_probe()
235 	rtcdev->rtc->range_max = GENMASK_ULL(42, 0);  in mpfs_rtc_probe()
237 	clk = devm_clk_get_enabled(&pdev->dev, "rtc");  in mpfs_rtc_probe()
241 	rtcdev->base = devm_platform_ioremap_resource(pdev, 0);  in mpfs_rtc_probe()
242 	if (IS_ERR(rtcdev->base)) {  in mpfs_rtc_probe()
243 		dev_dbg(&pdev->dev, "invalid ioremap resources\n");  in mpfs_rtc_probe()
244 		return PTR_ERR(rtcdev->base);  in mpfs_rtc_probe()
249 		dev_dbg(&pdev->dev, "could not get wakeup irq\n");  in mpfs_rtc_probe()
252 	ret = devm_request_irq(&pdev->dev, wakeup_irq, mpfs_rtc_wakeup_irq_handler, 0,  in mpfs_rtc_probe()
253 			       dev_name(&pdev->dev), rtcdev);  in mpfs_rtc_probe()
255 		dev_dbg(&pdev->dev, "could not request wakeup irq\n");  in mpfs_rtc_probe()
260 	prescaler = clk_get_rate(devm_clk_get(&pdev->dev, "rtcref")) - 1;  in mpfs_rtc_probe()
262 		dev_dbg(&pdev->dev, "invalid prescaler %lu\n", prescaler);  in mpfs_rtc_probe()
263 		return -EINVAL;  in mpfs_rtc_probe()
266 	writel(prescaler, rtcdev->base + PRESCALER_REG);  in mpfs_rtc_probe()
267 	dev_info(&pdev->dev, "prescaler set to: %lu\n", prescaler);  in mpfs_rtc_probe()
269 	device_init_wakeup(&pdev->dev, true);  in mpfs_rtc_probe()
270 	ret = dev_pm_set_wake_irq(&pdev->dev, wakeup_irq);  in mpfs_rtc_probe()
272 		dev_err(&pdev->dev, "failed to enable irq wake\n");  in mpfs_rtc_probe()
274 	return devm_rtc_register_device(rtcdev->rtc);  in mpfs_rtc_probe()
279 	dev_pm_clear_wake_irq(&pdev->dev);  in mpfs_rtc_remove()
283 	{ .compatible = "microchip,mpfs-rtc" },