1 // SPDX-License-Identifier: GPL-2.0-or-later
7  * Based on rtc.c by Paul Gortmaker
16  * Converted to the RTC subsystem and Driver Model
23 #include <linux/rtc.h>
35 #define RTSR_ALE		BIT(2)	/* RTC alarm interrupt enable */
36 #define RTSR_HZ			BIT(1)	/* HZ rising-edge detected */
37 #define RTSR_AL			BIT(0)	/* RTC alarm detected */
39 #include "rtc-sa1100.h"
41 #define RTC_DEF_DIVIDER		(32768 - 1)
49 	struct rtc_device *rtc = info->rtc;  in sa1100_rtc_interrupt()  local
53 	spin_lock(&info->lock);  in sa1100_rtc_interrupt()
55 	rtsr = readl_relaxed(info->rtsr);  in sa1100_rtc_interrupt()
57 	writel_relaxed(0, info->rtsr);  in sa1100_rtc_interrupt()
64 		writel_relaxed((RTSR_AL | RTSR_HZ) & (rtsr >> 2), info->rtsr);  in sa1100_rtc_interrupt()
73 		writel_relaxed(RTSR_AL | RTSR_HZ, info->rtsr);  in sa1100_rtc_interrupt()
79 	writel_relaxed(rtsr & (RTSR_ALE | RTSR_HZE), info->rtsr);  in sa1100_rtc_interrupt()
87 	rtc_update_irq(rtc, 1, events);  in sa1100_rtc_interrupt()
89 	spin_unlock(&info->lock);  in sa1100_rtc_interrupt()
99 	spin_lock_irq(&info->lock);  in sa1100_rtc_alarm_irq_enable()
100 	rtsr = readl_relaxed(info->rtsr);  in sa1100_rtc_alarm_irq_enable()
105 	writel_relaxed(rtsr, info->rtsr);  in sa1100_rtc_alarm_irq_enable()
106 	spin_unlock_irq(&info->lock);  in sa1100_rtc_alarm_irq_enable()
114 	rtc_time64_to_tm(readl_relaxed(info->rcnr), tm);  in sa1100_rtc_read_time()
122 	writel_relaxed(rtc_tm_to_time64(tm), info->rcnr);  in sa1100_rtc_set_time()
132 	rtsr = readl_relaxed(info->rtsr);  in sa1100_rtc_read_alarm()
133 	alrm->enabled = (rtsr & RTSR_ALE) ? 1 : 0;  in sa1100_rtc_read_alarm()
134 	alrm->pending = (rtsr & RTSR_AL) ? 1 : 0;  in sa1100_rtc_read_alarm()
142 	spin_lock_irq(&info->lock);  in sa1100_rtc_set_alarm()
143 	writel_relaxed(readl_relaxed(info->rtsr) &  in sa1100_rtc_set_alarm()
144 		(RTSR_HZE | RTSR_ALE | RTSR_AL), info->rtsr);  in sa1100_rtc_set_alarm()
145 	writel_relaxed(rtc_tm_to_time64(&alrm->time), info->rtar);  in sa1100_rtc_set_alarm()
146 	if (alrm->enabled)  in sa1100_rtc_set_alarm()
147 		writel_relaxed(readl_relaxed(info->rtsr) | RTSR_ALE, info->rtsr);  in sa1100_rtc_set_alarm()
149 		writel_relaxed(readl_relaxed(info->rtsr) & ~RTSR_ALE, info->rtsr);  in sa1100_rtc_set_alarm()
150 	spin_unlock_irq(&info->lock);  in sa1100_rtc_set_alarm()
159 	seq_printf(seq, "trim/divider\t\t: 0x%08x\n", readl_relaxed(info->rttr));  in sa1100_rtc_proc()
160 	seq_printf(seq, "RTSR\t\t\t: 0x%08x\n", readl_relaxed(info->rtsr));  in sa1100_rtc_proc()
178 	spin_lock_init(&info->lock);  in sa1100_rtc_init()
180 	info->clk = devm_clk_get(&pdev->dev, NULL);  in sa1100_rtc_init()
181 	if (IS_ERR(info->clk)) {  in sa1100_rtc_init()
182 		dev_err(&pdev->dev, "failed to find rtc clock source\n");  in sa1100_rtc_init()
183 		return PTR_ERR(info->clk);  in sa1100_rtc_init()
186 	ret = clk_prepare_enable(info->clk);  in sa1100_rtc_init()
196 	if (readl_relaxed(info->rttr) == 0) {  in sa1100_rtc_init()
197 		writel_relaxed(RTC_DEF_DIVIDER + (RTC_DEF_TRIM << 16), info->rttr);  in sa1100_rtc_init()
198 		dev_warn(&pdev->dev, "warning: "  in sa1100_rtc_init()
200 		/* The current RTC value probably doesn't make sense either */  in sa1100_rtc_init()
201 		writel_relaxed(0, info->rcnr);  in sa1100_rtc_init()
204 	info->rtc->ops = &sa1100_rtc_ops;  in sa1100_rtc_init()
205 	info->rtc->max_user_freq = RTC_FREQ;  in sa1100_rtc_init()
206 	info->rtc->range_max = U32_MAX;  in sa1100_rtc_init()
208 	ret = devm_rtc_register_device(info->rtc);  in sa1100_rtc_init()
210 		clk_disable_unprepare(info->clk);  in sa1100_rtc_init()
236 	writel_relaxed(RTSR_AL | RTSR_HZ, info->rtsr);  in sa1100_rtc_init()
249 	irq_1hz = platform_get_irq_byname(pdev, "rtc 1Hz");  in sa1100_rtc_probe()
250 	irq_alarm = platform_get_irq_byname(pdev, "rtc alarm");  in sa1100_rtc_probe()
252 		return -ENODEV;  in sa1100_rtc_probe()
254 	info = devm_kzalloc(&pdev->dev, sizeof(struct sa1100_rtc), GFP_KERNEL);  in sa1100_rtc_probe()
256 		return -ENOMEM;  in sa1100_rtc_probe()
257 	info->irq_1hz = irq_1hz;  in sa1100_rtc_probe()
258 	info->irq_alarm = irq_alarm;  in sa1100_rtc_probe()
260 	info->rtc = devm_rtc_allocate_device(&pdev->dev);  in sa1100_rtc_probe()
261 	if (IS_ERR(info->rtc))  in sa1100_rtc_probe()
262 		return PTR_ERR(info->rtc);  in sa1100_rtc_probe()
264 	ret = devm_request_irq(&pdev->dev, irq_1hz, sa1100_rtc_interrupt, 0,  in sa1100_rtc_probe()
265 			       "rtc 1Hz", &pdev->dev);  in sa1100_rtc_probe()
267 		dev_err(&pdev->dev, "IRQ %d already in use.\n", irq_1hz);  in sa1100_rtc_probe()
270 	ret = devm_request_irq(&pdev->dev, irq_alarm, sa1100_rtc_interrupt, 0,  in sa1100_rtc_probe()
271 			       "rtc Alrm", &pdev->dev);  in sa1100_rtc_probe()
273 		dev_err(&pdev->dev, "IRQ %d already in use.\n", irq_alarm);  in sa1100_rtc_probe()
282 	    of_device_is_compatible(pdev->dev.of_node, "mrvl,sa1100-rtc")) {  in sa1100_rtc_probe()
283 		info->rcnr = base + 0x04;  in sa1100_rtc_probe()
284 		info->rtsr = base + 0x10;  in sa1100_rtc_probe()
285 		info->rtar = base + 0x00;  in sa1100_rtc_probe()
286 		info->rttr = base + 0x08;  in sa1100_rtc_probe()
288 		info->rcnr = base + 0x0;  in sa1100_rtc_probe()
289 		info->rtsr = base + 0x8;  in sa1100_rtc_probe()
290 		info->rtar = base + 0x4;  in sa1100_rtc_probe()
291 		info->rttr = base + 0xc;  in sa1100_rtc_probe()
295 	device_init_wakeup(&pdev->dev, 1);  in sa1100_rtc_probe()
305 		spin_lock_irq(&info->lock);  in sa1100_rtc_remove()
306 		writel_relaxed(0, info->rtsr);  in sa1100_rtc_remove()
307 		spin_unlock_irq(&info->lock);  in sa1100_rtc_remove()
308 		clk_disable_unprepare(info->clk);  in sa1100_rtc_remove()
317 		enable_irq_wake(info->irq_alarm);  in sa1100_rtc_suspend()
325 		disable_irq_wake(info->irq_alarm);  in sa1100_rtc_resume()
335 	{ .compatible = "mrvl,sa1100-rtc", },
336 	{ .compatible = "mrvl,mmp-rtc", },
346 		.name	= "sa1100-rtc",
355 MODULE_DESCRIPTION("SA11x0/PXA2xx Realtime Clock Driver (RTC)");
357 MODULE_ALIAS("platform:sa1100-rtc");