drivers/rtc/rtc-brcmstb-waketimer.c

49 static inline bool brcmstb_waketmr_is_pending(struct brcmstb_waketmr *timer)
53 	reg = readl_relaxed(timer->base + BRCMSTB_WKTMR_EVENT);
57 static inline void brcmstb_waketmr_clear_alarm(struct brcmstb_waketmr *timer)
61 	if (timer->alarm_en && timer->alarm_irq)
62 		disable_irq(timer->alarm_irq);
63 	timer->alarm_en = false;
64 	reg = readl_relaxed(timer->base + BRCMSTB_WKTMR_COUNTER);
65 	writel_relaxed(reg - 1, timer->base + BRCMSTB_WKTMR_ALARM);
66 	writel_relaxed(WKTMR_ALARM_EVENT, timer->base + BRCMSTB_WKTMR_EVENT);
67 	(void)readl_relaxed(timer->base + BRCMSTB_WKTMR_EVENT);
68 	if (timer->alarm_expired) {
69 		timer->alarm_expired = false;
71 		enable_irq(timer->alarm_irq);
75 static void brcmstb_waketmr_set_alarm(struct brcmstb_waketmr *timer,
80 	brcmstb_waketmr_clear_alarm(timer);
83 	writel_relaxed(timer->rate, timer->base + BRCMSTB_WKTMR_PRESCALER);
85 	writel_relaxed(secs, timer->base + BRCMSTB_WKTMR_ALARM);
86 	now = readl_relaxed(timer->base + BRCMSTB_WKTMR_COUNTER);
89 		!brcmstb_waketmr_is_pending(timer)) {
91 		writel_relaxed(secs, timer->base + BRCMSTB_WKTMR_ALARM);
92 		now = readl_relaxed(timer->base + BRCMSTB_WKTMR_COUNTER);
98 	struct brcmstb_waketmr *timer = data;
100 	if (!timer->alarm_irq)
101 		pm_wakeup_event(timer->dev, 0);
107 	struct brcmstb_waketmr *timer = data;
110 	if (!brcmstb_waketmr_is_pending(timer))
113 	if (timer->alarm_en) {
114 		if (device_may_wakeup(timer->dev)) {
116 			timer->alarm_expired = true;
119 				       timer->base + BRCMSTB_WKTMR_EVENT);
121 		rtc_update_irq(timer->rtc, 1, RTC_IRQF | RTC_AF);
124 			       timer->base + BRCMSTB_WKTMR_EVENT);
135 static void wktmr_read(struct brcmstb_waketmr *timer,
141 		t->sec = readl_relaxed(timer->base + BRCMSTB_WKTMR_COUNTER);
142 		tmp = readl_relaxed(timer->base + BRCMSTB_WKTMR_PRESCALER_VAL);
143 	} while (tmp >= timer->rate);
145 	t->pre = timer->rate - tmp;
148 static int brcmstb_waketmr_prepare_suspend(struct brcmstb_waketmr *timer)
150 	struct device *dev = timer->dev;
154 		ret = enable_irq_wake(timer->wake_irq);
159 		if (timer->alarm_en && timer->alarm_irq) {
160 			ret = enable_irq_wake(timer->alarm_irq);
163 				disable_irq_wake(timer->wake_irq);
172 /* If enabled as a wakeup-source, arm the timer when powering off */
176 	struct brcmstb_waketmr *timer;
178 	timer = container_of(nb, struct brcmstb_waketmr, reboot_notifier);
180 	/* Set timer for cold boot */
182 		brcmstb_waketmr_prepare_suspend(timer);
190 	struct brcmstb_waketmr *timer = dev_get_drvdata(dev);
193 	wktmr_read(timer, &now);
203 	struct brcmstb_waketmr *timer = dev_get_drvdata(dev);
208 	writel_relaxed(sec, timer->base + BRCMSTB_WKTMR_COUNTER);
216 	struct brcmstb_waketmr *timer = dev_get_drvdata(dev);
218 	alarm->enabled = timer->alarm_en;
219 	rtc_time64_to_tm(timer->rtc_alarm, &alarm->time);
221 	alarm->pending = brcmstb_waketmr_is_pending(timer);
229 	struct brcmstb_waketmr *timer = dev_get_drvdata(dev);
231 	if (enabled && !timer->alarm_en) {
232 		if ((int)(readl_relaxed(timer->base + BRCMSTB_WKTMR_COUNTER) -
233 		    readl_relaxed(timer->base + BRCMSTB_WKTMR_ALARM)) >= 0 &&
234 		    !brcmstb_waketmr_is_pending(timer))
236 		timer->alarm_en = true;
237 		if (timer->alarm_irq) {
238 			if (timer->alarm_expired) {
239 				timer->alarm_expired = false;
241 				enable_irq(timer->alarm_irq);
243 			enable_irq(timer->alarm_irq);
245 	} else if (!enabled && timer->alarm_en) {
246 		if (timer->alarm_irq)
247 			disable_irq(timer->alarm_irq);
248 		timer->alarm_en = false;
257 	struct brcmstb_waketmr *timer = dev_get_drvdata(dev);
259 	timer->rtc_alarm = rtc_tm_to_time64(&alarm->time);
261 	brcmstb_waketmr_set_alarm(timer, timer->rtc_alarm);
277 	struct brcmstb_waketmr *timer;
280 	timer = devm_kzalloc(dev, sizeof(*timer), GFP_KERNEL);
281 	if (!timer)
284 	platform_set_drvdata(pdev, timer);
285 	timer->dev = dev;
287 	timer->base = devm_platform_ioremap_resource(pdev, 0);
288 	if (IS_ERR(timer->base))
289 		return PTR_ERR(timer->base);
291 	timer->rtc = devm_rtc_allocate_device(dev);
292 	if (IS_ERR(timer->rtc))
293 		return PTR_ERR(timer->rtc);
304 	timer->wake_irq = (unsigned int)ret;
306 	timer->clk = devm_clk_get(dev, NULL);
307 	if (!IS_ERR(timer->clk)) {
308 		ret = clk_prepare_enable(timer->clk);
311 		timer->rate = clk_get_rate(timer->clk);
312 		if (!timer->rate)
313 			timer->rate = BRCMSTB_WKTMR_DEFAULT_FREQ;
315 		timer->rate = BRCMSTB_WKTMR_DEFAULT_FREQ;
316 		timer->clk = NULL;
319 	ret = devm_request_irq(dev, timer->wake_irq, brcmstb_waketmr_irq, 0,
320 			       "brcmstb-waketimer", timer);
324 	brcmstb_waketmr_clear_alarm(timer);
329 		timer->alarm_irq = (unsigned int)ret;
330 		ret = devm_request_irq(dev, timer->alarm_irq, brcmstb_alarm_irq,
332 				       timer);
334 			timer->alarm_irq = 0;
337 	timer->reboot_notifier.notifier_call = brcmstb_waketmr_reboot;
338 	register_reboot_notifier(&timer->reboot_notifier);
340 	timer->rtc->ops = &brcmstb_waketmr_ops;
341 	timer->rtc->range_max = U32_MAX;
343 	ret = devm_rtc_register_device(timer->rtc);
350 	unregister_reboot_notifier(&timer->reboot_notifier);
353 	clk_disable_unprepare(timer->clk);
360 	struct brcmstb_waketmr *timer = dev_get_drvdata(&pdev->dev);
362 	unregister_reboot_notifier(&timer->reboot_notifier);
363 	clk_disable_unprepare(timer->clk);
369 	struct brcmstb_waketmr *timer = dev_get_drvdata(dev);
371 	return brcmstb_waketmr_prepare_suspend(timer);
376 	struct brcmstb_waketmr *timer = dev_get_drvdata(dev);
379 	if (timer->alarm_expired && device_may_wakeup(dev))
387 	struct brcmstb_waketmr *timer = dev_get_drvdata(dev);
393 	ret = disable_irq_wake(timer->wake_irq);
394 	if (timer->alarm_en && timer->alarm_irq)
395 		disable_irq_wake(timer->alarm_irq);
397 	brcmstb_waketmr_clear_alarm(timer);
433 MODULE_DESCRIPTION("Wake-up timer driver for STB chips");