6  * Based on rtc.c by Paul Gortmaker
15  * Converted to the RTC subsystem and Driver Model
27 #include <linux/rtc.h>
39 #define RTSR_ALE		BIT(2)	/* RTC alarm interrupt enable */
40 #define RTSR_HZ			BIT(1)	/* HZ rising-edge detected */
41 #define RTSR_AL			BIT(0)	/* RTC alarm detected */
43 #include "rtc-sa1100.h"
45 #define RTC_DEF_DIVIDER		(32768 - 1)
53 	struct rtc_device *rtc = info->rtc;  in sa1100_rtc_interrupt()  local
57 	spin_lock(&info->lock);  in sa1100_rtc_interrupt()
59 	rtsr = readl_relaxed(info->rtsr);  in sa1100_rtc_interrupt()
61 	writel_relaxed(0, info->rtsr);  in sa1100_rtc_interrupt()
68 		writel_relaxed((RTSR_AL | RTSR_HZ) & (rtsr >> 2), info->rtsr);  in sa1100_rtc_interrupt()
77 		writel_relaxed(RTSR_AL | RTSR_HZ, info->rtsr);  in sa1100_rtc_interrupt()
83 	writel_relaxed(rtsr & (RTSR_ALE | RTSR_HZE), info->rtsr);  in sa1100_rtc_interrupt()
91 	rtc_update_irq(rtc, 1, events);  in sa1100_rtc_interrupt()
93 	spin_unlock(&info->lock);  in sa1100_rtc_interrupt()
103 	spin_lock_irq(&info->lock);  in sa1100_rtc_alarm_irq_enable()
104 	rtsr = readl_relaxed(info->rtsr);  in sa1100_rtc_alarm_irq_enable()
109 	writel_relaxed(rtsr, info->rtsr);  in sa1100_rtc_alarm_irq_enable()
110 	spin_unlock_irq(&info->lock);  in sa1100_rtc_alarm_irq_enable()
118 	rtc_time_to_tm(readl_relaxed(info->rcnr), tm);  in sa1100_rtc_read_time()
130 		writel_relaxed(time, info->rcnr);  in sa1100_rtc_set_time()
139 	rtsr = readl_relaxed(info->rtsr);  in sa1100_rtc_read_alarm()
140 	alrm->enabled = (rtsr & RTSR_ALE) ? 1 : 0;  in sa1100_rtc_read_alarm()
141 	alrm->pending = (rtsr & RTSR_AL) ? 1 : 0;  in sa1100_rtc_read_alarm()
151 	spin_lock_irq(&info->lock);  in sa1100_rtc_set_alarm()
152 	ret = rtc_tm_to_time(&alrm->time, &time);  in sa1100_rtc_set_alarm()
155 	writel_relaxed(readl_relaxed(info->rtsr) &  in sa1100_rtc_set_alarm()
156 		(RTSR_HZE | RTSR_ALE | RTSR_AL), info->rtsr);  in sa1100_rtc_set_alarm()
157 	writel_relaxed(time, info->rtar);  in sa1100_rtc_set_alarm()
158 	if (alrm->enabled)  in sa1100_rtc_set_alarm()
159 		writel_relaxed(readl_relaxed(info->rtsr) | RTSR_ALE, info->rtsr);  in sa1100_rtc_set_alarm()
161 		writel_relaxed(readl_relaxed(info->rtsr) & ~RTSR_ALE, info->rtsr);  in sa1100_rtc_set_alarm()
163 	spin_unlock_irq(&info->lock);  in sa1100_rtc_set_alarm()
172 	seq_printf(seq, "trim/divider\t\t: 0x%08x\n", readl_relaxed(info->rttr));  in sa1100_rtc_proc()
173 	seq_printf(seq, "RTSR\t\t\t: 0x%08x\n", readl_relaxed(info->rtsr));  in sa1100_rtc_proc()
191 	spin_lock_init(&info->lock);  in sa1100_rtc_init()
193 	info->clk = devm_clk_get(&pdev->dev, NULL);  in sa1100_rtc_init()
194 	if (IS_ERR(info->clk)) {  in sa1100_rtc_init()
195 		dev_err(&pdev->dev, "failed to find rtc clock source\n");  in sa1100_rtc_init()
196 		return PTR_ERR(info->clk);  in sa1100_rtc_init()
199 	ret = clk_prepare_enable(info->clk);  in sa1100_rtc_init()
209 	if (readl_relaxed(info->rttr) == 0) {  in sa1100_rtc_init()
210 		writel_relaxed(RTC_DEF_DIVIDER + (RTC_DEF_TRIM << 16), info->rttr);  in sa1100_rtc_init()
211 		dev_warn(&pdev->dev, "warning: "  in sa1100_rtc_init()
213 		/* The current RTC value probably doesn't make sense either */  in sa1100_rtc_init()
214 		writel_relaxed(0, info->rcnr);  in sa1100_rtc_init()
217 	info->rtc->ops = &sa1100_rtc_ops;  in sa1100_rtc_init()
218 	info->rtc->max_user_freq = RTC_FREQ;  in sa1100_rtc_init()
220 	ret = rtc_register_device(info->rtc);  in sa1100_rtc_init()
222 		clk_disable_unprepare(info->clk);  in sa1100_rtc_init()
248 	writel_relaxed(RTSR_AL | RTSR_HZ, info->rtsr);  in sa1100_rtc_init()
262 	irq_1hz = platform_get_irq_byname(pdev, "rtc 1Hz");  in sa1100_rtc_probe()
263 	irq_alarm = platform_get_irq_byname(pdev, "rtc alarm");  in sa1100_rtc_probe()
265 		return -ENODEV;  in sa1100_rtc_probe()
267 	info = devm_kzalloc(&pdev->dev, sizeof(struct sa1100_rtc), GFP_KERNEL);  in sa1100_rtc_probe()
269 		return -ENOMEM;  in sa1100_rtc_probe()
270 	info->irq_1hz = irq_1hz;  in sa1100_rtc_probe()
271 	info->irq_alarm = irq_alarm;  in sa1100_rtc_probe()
273 	info->rtc = devm_rtc_allocate_device(&pdev->dev);  in sa1100_rtc_probe()
274 	if (IS_ERR(info->rtc))  in sa1100_rtc_probe()
275 		return PTR_ERR(info->rtc);  in sa1100_rtc_probe()
277 	ret = devm_request_irq(&pdev->dev, irq_1hz, sa1100_rtc_interrupt, 0,  in sa1100_rtc_probe()
278 			       "rtc 1Hz", &pdev->dev);  in sa1100_rtc_probe()
280 		dev_err(&pdev->dev, "IRQ %d already in use.\n", irq_1hz);  in sa1100_rtc_probe()
283 	ret = devm_request_irq(&pdev->dev, irq_alarm, sa1100_rtc_interrupt, 0,  in sa1100_rtc_probe()
284 			       "rtc Alrm", &pdev->dev);  in sa1100_rtc_probe()
286 		dev_err(&pdev->dev, "IRQ %d already in use.\n", irq_alarm);  in sa1100_rtc_probe()
291 	base = devm_ioremap_resource(&pdev->dev, iores);  in sa1100_rtc_probe()
296 	    of_device_is_compatible(pdev->dev.of_node, "mrvl,sa1100-rtc")) {  in sa1100_rtc_probe()
297 		info->rcnr = base + 0x04;  in sa1100_rtc_probe()
298 		info->rtsr = base + 0x10;  in sa1100_rtc_probe()
299 		info->rtar = base + 0x00;  in sa1100_rtc_probe()
300 		info->rttr = base + 0x08;  in sa1100_rtc_probe()
302 		info->rcnr = base + 0x0;  in sa1100_rtc_probe()
303 		info->rtsr = base + 0x8;  in sa1100_rtc_probe()
304 		info->rtar = base + 0x4;  in sa1100_rtc_probe()
305 		info->rttr = base + 0xc;  in sa1100_rtc_probe()
309 	device_init_wakeup(&pdev->dev, 1);  in sa1100_rtc_probe()
319 		spin_lock_irq(&info->lock);  in sa1100_rtc_remove()
320 		writel_relaxed(0, info->rtsr);  in sa1100_rtc_remove()
321 		spin_unlock_irq(&info->lock);  in sa1100_rtc_remove()
322 		clk_disable_unprepare(info->clk);  in sa1100_rtc_remove()
333 		enable_irq_wake(info->irq_alarm);  in sa1100_rtc_suspend()
341 		disable_irq_wake(info->irq_alarm);  in sa1100_rtc_resume()
351 	{ .compatible = "mrvl,sa1100-rtc", },
352 	{ .compatible = "mrvl,mmp-rtc", },
362 		.name	= "sa1100-rtc",
371 MODULE_DESCRIPTION("SA11x0/PXA2xx Realtime Clock Driver (RTC)");
373 MODULE_ALIAS("platform:sa1100-rtc");