[linux-block.git] / drivers / rtc / rtc-brcmstb-waketimer.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright © 2014-2023 Broadcom
 */

#define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt

#include <linux/clk.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irqreturn.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm.h>
#include <linux/reboot.h>
#include <linux/rtc.h>
#include <linux/stat.h>
#include <linux/suspend.h>

struct brcmstb_waketmr {
	struct rtc_device *rtc;
	struct device *dev;
	void __iomem *base;
	unsigned int wake_irq;
	unsigned int alarm_irq;
	struct notifier_block reboot_notifier;
	struct clk *clk;
	u32 rate;
	unsigned long rtc_alarm;
	bool alarm_en;
	bool alarm_expired;
};

#define BRCMSTB_WKTMR_EVENT		0x00
#define  WKTMR_ALARM_EVENT		BIT(0)
#define BRCMSTB_WKTMR_COUNTER		0x04
#define BRCMSTB_WKTMR_ALARM		0x08
#define BRCMSTB_WKTMR_PRESCALER		0x0C
#define BRCMSTB_WKTMR_PRESCALER_VAL	0x10

#define BRCMSTB_WKTMR_DEFAULT_FREQ	27000000

static inline bool brcmstb_waketmr_is_pending(struct brcmstb_waketmr *timer)
{
	u32 reg;

	reg = readl_relaxed(timer->base + BRCMSTB_WKTMR_EVENT);
	return !!(reg & WKTMR_ALARM_EVENT);
}

static inline void brcmstb_waketmr_clear_alarm(struct brcmstb_waketmr *timer)
{
	u32 reg;

	if (timer->alarm_en && timer->alarm_irq)
		disable_irq(timer->alarm_irq);
	timer->alarm_en = false;
	reg = readl_relaxed(timer->base + BRCMSTB_WKTMR_COUNTER);
	writel_relaxed(reg - 1, timer->base + BRCMSTB_WKTMR_ALARM);
	writel_relaxed(WKTMR_ALARM_EVENT, timer->base + BRCMSTB_WKTMR_EVENT);
	(void)readl_relaxed(timer->base + BRCMSTB_WKTMR_EVENT);
	if (timer->alarm_expired) {
		timer->alarm_expired = false;
		/* maintain call balance */
		enable_irq(timer->alarm_irq);
	}
}

static void brcmstb_waketmr_set_alarm(struct brcmstb_waketmr *timer,
				      unsigned int secs)
{
	unsigned int now;

	brcmstb_waketmr_clear_alarm(timer);

	/* Make sure we are actually counting in seconds */
	writel_relaxed(timer->rate, timer->base + BRCMSTB_WKTMR_PRESCALER);

	writel_relaxed(secs, timer->base + BRCMSTB_WKTMR_ALARM);
	now = readl_relaxed(timer->base + BRCMSTB_WKTMR_COUNTER);

	while ((int)(secs - now) <= 0 &&
		!brcmstb_waketmr_is_pending(timer)) {
		secs = now + 1;
		writel_relaxed(secs, timer->base + BRCMSTB_WKTMR_ALARM);
		now = readl_relaxed(timer->base + BRCMSTB_WKTMR_COUNTER);
	}
}

static irqreturn_t brcmstb_waketmr_irq(int irq, void *data)
{
	struct brcmstb_waketmr *timer = data;

	if (!timer->alarm_irq)
		pm_wakeup_event(timer->dev, 0);
	return IRQ_HANDLED;
}

static irqreturn_t brcmstb_alarm_irq(int irq, void *data)
{
	struct brcmstb_waketmr *timer = data;

	/* Ignore spurious interrupts */
	if (!brcmstb_waketmr_is_pending(timer))
		return IRQ_HANDLED;

	if (timer->alarm_en) {
		if (device_may_wakeup(timer->dev)) {
			disable_irq_nosync(irq);
			timer->alarm_expired = true;
		} else {
			writel_relaxed(WKTMR_ALARM_EVENT,
				       timer->base + BRCMSTB_WKTMR_EVENT);
		}
		rtc_update_irq(timer->rtc, 1, RTC_IRQF | RTC_AF);
	} else {
		writel_relaxed(WKTMR_ALARM_EVENT,
			       timer->base + BRCMSTB_WKTMR_EVENT);
	}

	return IRQ_HANDLED;
}

struct wktmr_time {
	u32 sec;
	u32 pre;
};

static void wktmr_read(struct brcmstb_waketmr *timer,
		       struct wktmr_time *t)
{
	u32 tmp;

	do {
		t->sec = readl_relaxed(timer->base + BRCMSTB_WKTMR_COUNTER);
		tmp = readl_relaxed(timer->base + BRCMSTB_WKTMR_PRESCALER_VAL);
	} while (tmp >= timer->rate);

	t->pre = timer->rate - tmp;
}

static int brcmstb_waketmr_prepare_suspend(struct brcmstb_waketmr *timer)
{
	struct device *dev = timer->dev;
	int ret;

	if (device_may_wakeup(dev)) {
		ret = enable_irq_wake(timer->wake_irq);
		if (ret) {
			dev_err(dev, "failed to enable wake-up interrupt\n");
			return ret;
		}
		if (timer->alarm_en && timer->alarm_irq) {
			ret = enable_irq_wake(timer->alarm_irq);
			if (ret) {
				dev_err(dev, "failed to enable rtc interrupt\n");
				disable_irq_wake(timer->wake_irq);
				return ret;
			}
		}
	}

	return 0;
}

/* If enabled as a wakeup-source, arm the timer when powering off */
static int brcmstb_waketmr_reboot(struct notifier_block *nb,
		unsigned long action, void *data)
{
	struct brcmstb_waketmr *timer;

	timer = container_of(nb, struct brcmstb_waketmr, reboot_notifier);

	/* Set timer for cold boot */
	if (action == SYS_POWER_OFF)
		brcmstb_waketmr_prepare_suspend(timer);

	return NOTIFY_DONE;
}

static int brcmstb_waketmr_gettime(struct device *dev,
				   struct rtc_time *tm)
{
	struct brcmstb_waketmr *timer = dev_get_drvdata(dev);
	struct wktmr_time now;

	wktmr_read(timer, &now);

	rtc_time64_to_tm(now.sec, tm);

	return 0;
}

static int brcmstb_waketmr_settime(struct device *dev,
				   struct rtc_time *tm)
{
	struct brcmstb_waketmr *timer = dev_get_drvdata(dev);
	time64_t sec;

	sec = rtc_tm_to_time64(tm);

	writel_relaxed(sec, timer->base + BRCMSTB_WKTMR_COUNTER);

	return 0;
}

static int brcmstb_waketmr_getalarm(struct device *dev,
				    struct rtc_wkalrm *alarm)
{
	struct brcmstb_waketmr *timer = dev_get_drvdata(dev);

	alarm->enabled = timer->alarm_en;
	rtc_time64_to_tm(timer->rtc_alarm, &alarm->time);

	alarm->pending = brcmstb_waketmr_is_pending(timer);

	return 0;
}

static int brcmstb_waketmr_alarm_enable(struct device *dev,
					unsigned int enabled)
{
	struct brcmstb_waketmr *timer = dev_get_drvdata(dev);

	if (enabled && !timer->alarm_en) {
		if ((int)(readl_relaxed(timer->base + BRCMSTB_WKTMR_COUNTER) -
		    readl_relaxed(timer->base + BRCMSTB_WKTMR_ALARM)) >= 0 &&
		    !brcmstb_waketmr_is_pending(timer))
			return -EINVAL;
		timer->alarm_en = true;
		if (timer->alarm_irq) {
			if (timer->alarm_expired) {
				timer->alarm_expired = false;
				/* maintain call balance */
				enable_irq(timer->alarm_irq);
			}
			enable_irq(timer->alarm_irq);
		}
	} else if (!enabled && timer->alarm_en) {
		if (timer->alarm_irq)
			disable_irq(timer->alarm_irq);
		timer->alarm_en = false;
	}

	return 0;
}

static int brcmstb_waketmr_setalarm(struct device *dev,
				     struct rtc_wkalrm *alarm)
{
	struct brcmstb_waketmr *timer = dev_get_drvdata(dev);

	timer->rtc_alarm = rtc_tm_to_time64(&alarm->time);

	brcmstb_waketmr_set_alarm(timer, timer->rtc_alarm);

	return brcmstb_waketmr_alarm_enable(dev, alarm->enabled);
}

static const struct rtc_class_ops brcmstb_waketmr_ops = {
	.read_time	= brcmstb_waketmr_gettime,
	.set_time	= brcmstb_waketmr_settime,
	.read_alarm	= brcmstb_waketmr_getalarm,
	.set_alarm	= brcmstb_waketmr_setalarm,
	.alarm_irq_enable = brcmstb_waketmr_alarm_enable,
};

static int brcmstb_waketmr_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct brcmstb_waketmr *timer;
	int ret;

	timer = devm_kzalloc(dev, sizeof(*timer), GFP_KERNEL);
	if (!timer)
		return -ENOMEM;

	platform_set_drvdata(pdev, timer);
	timer->dev = dev;

	timer->base = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(timer->base))
		return PTR_ERR(timer->base);

	timer->rtc = devm_rtc_allocate_device(dev);
	if (IS_ERR(timer->rtc))
		return PTR_ERR(timer->rtc);

	/*
	 * Set wakeup capability before requesting wakeup interrupt, so we can
	 * process boot-time "wakeups" (e.g., from S5 soft-off)
	 */
	device_init_wakeup(dev, true);

	ret = platform_get_irq(pdev, 0);
	if (ret < 0)
		return -ENODEV;
	timer->wake_irq = (unsigned int)ret;

	timer->clk = devm_clk_get(dev, NULL);
	if (!IS_ERR(timer->clk)) {
		ret = clk_prepare_enable(timer->clk);
		if (ret)
			return ret;
		timer->rate = clk_get_rate(timer->clk);
		if (!timer->rate)
			timer->rate = BRCMSTB_WKTMR_DEFAULT_FREQ;
	} else {
		timer->rate = BRCMSTB_WKTMR_DEFAULT_FREQ;
		timer->clk = NULL;
	}

	ret = devm_request_irq(dev, timer->wake_irq, brcmstb_waketmr_irq, 0,
			       "brcmstb-waketimer", timer);
	if (ret < 0)
		goto err_clk;

	brcmstb_waketmr_clear_alarm(timer);

	/* Attempt to initialize non-wake irq */
	ret = platform_get_irq(pdev, 1);
	if (ret > 0) {
		timer->alarm_irq = (unsigned int)ret;
		ret = devm_request_irq(dev, timer->alarm_irq, brcmstb_alarm_irq,
				       IRQF_NO_AUTOEN, "brcmstb-waketimer-rtc",
				       timer);
		if (ret < 0)
			timer->alarm_irq = 0;
	}

	timer->reboot_notifier.notifier_call = brcmstb_waketmr_reboot;
	register_reboot_notifier(&timer->reboot_notifier);

	timer->rtc->ops = &brcmstb_waketmr_ops;
	timer->rtc->range_max = U32_MAX;

	ret = devm_rtc_register_device(timer->rtc);
	if (ret)
		goto err_notifier;

	return 0;

err_notifier:
	unregister_reboot_notifier(&timer->reboot_notifier);

err_clk:
	clk_disable_unprepare(timer->clk);

	return ret;
}

static void brcmstb_waketmr_remove(struct platform_device *pdev)
{
	struct brcmstb_waketmr *timer = dev_get_drvdata(&pdev->dev);

	unregister_reboot_notifier(&timer->reboot_notifier);
	clk_disable_unprepare(timer->clk);
}

#ifdef CONFIG_PM_SLEEP
static int brcmstb_waketmr_suspend(struct device *dev)
{
	struct brcmstb_waketmr *timer = dev_get_drvdata(dev);

	return brcmstb_waketmr_prepare_suspend(timer);
}

static int brcmstb_waketmr_suspend_noirq(struct device *dev)
{
	struct brcmstb_waketmr *timer = dev_get_drvdata(dev);

	/* Catch any alarms occurring prior to noirq */
	if (timer->alarm_expired && device_may_wakeup(dev))
		return -EBUSY;

	return 0;
}

static int brcmstb_waketmr_resume(struct device *dev)
{
	struct brcmstb_waketmr *timer = dev_get_drvdata(dev);
	int ret;

	if (!device_may_wakeup(dev))
		return 0;

	ret = disable_irq_wake(timer->wake_irq);
	if (timer->alarm_en && timer->alarm_irq)
		disable_irq_wake(timer->alarm_irq);

	brcmstb_waketmr_clear_alarm(timer);

	return ret;
}
#else
#define brcmstb_waketmr_suspend		NULL
#define brcmstb_waketmr_suspend_noirq	NULL
#define brcmstb_waketmr_resume		NULL
#endif /* CONFIG_PM_SLEEP */

static const struct dev_pm_ops brcmstb_waketmr_pm_ops = {
	.suspend	= brcmstb_waketmr_suspend,
	.suspend_noirq	= brcmstb_waketmr_suspend_noirq,
	.resume		= brcmstb_waketmr_resume,
};

static const __maybe_unused struct of_device_id brcmstb_waketmr_of_match[] = {
	{ .compatible = "brcm,brcmstb-waketimer" },
	{ /* sentinel */ },
};

static struct platform_driver brcmstb_waketmr_driver = {
	.probe			= brcmstb_waketmr_probe,
	.remove			= brcmstb_waketmr_remove,
	.driver = {
		.name		= "brcmstb-waketimer",
		.pm		= &brcmstb_waketmr_pm_ops,
		.of_match_table	= of_match_ptr(brcmstb_waketmr_of_match),
	}
};
module_platform_driver(brcmstb_waketmr_driver);

MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Brian Norris");
MODULE_AUTHOR("Markus Mayer");
MODULE_AUTHOR("Doug Berger");
MODULE_DESCRIPTION("Wake-up timer driver for STB chips");
Commit	Line	Data
1802d0be	1	// SPDX-License-Identifier: GPL-2.0-only
c4f07ece	2	/*
e005a9b3	3	* Copyright © 2014-2023 Broadcom
c4f07ece BN	4	*/
	5
	6	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
	7
	8	#include <linux/clk.h>
	9	#include <linux/device.h>
	10	#include <linux/err.h>
	11	#include <linux/init.h>
	12	#include <linux/interrupt.h>
	13	#include <linux/io.h>
	14	#include <linux/irqreturn.h>
	15	#include <linux/kernel.h>
	16	#include <linux/module.h>
	17	#include <linux/of.h>
	18	#include <linux/platform_device.h>
	19	#include <linux/pm.h>
c4f07ece BN	20	#include <linux/reboot.h>
	21	#include <linux/rtc.h>
	22	#include <linux/stat.h>
	23	#include <linux/suspend.h>
	24
	25	struct brcmstb_waketmr {
	26	struct rtc_device *rtc;
	27	struct device *dev;
	28	void __iomem *base;
eae258ed	29	unsigned int wake_irq;
24304a87	30	unsigned int alarm_irq;
c4f07ece BN	31	struct notifier_block reboot_notifier;
	32	struct clk *clk;
	33	u32 rate;
516ae02c DB	34	unsigned long rtc_alarm;
516ae02c DB	35	bool alarm_en;
e005a9b3	36	bool alarm_expired;
c4f07ece BN	37	};
	38
	39	#define BRCMSTB_WKTMR_EVENT 0x00
90226f6b	40	#define WKTMR_ALARM_EVENT BIT(0)
c4f07ece BN	41	#define BRCMSTB_WKTMR_COUNTER 0x04
	42	#define BRCMSTB_WKTMR_ALARM 0x08
	43	#define BRCMSTB_WKTMR_PRESCALER 0x0C
	44	#define BRCMSTB_WKTMR_PRESCALER_VAL 0x10
	45
	46	#define BRCMSTB_WKTMR_DEFAULT_FREQ 27000000
	47
90226f6b DB	48	static inline bool brcmstb_waketmr_is_pending(struct brcmstb_waketmr *timer)
	49	{
	50	u32 reg;
	51
	52	reg = readl_relaxed(timer->base + BRCMSTB_WKTMR_EVENT);
	53	return !!(reg & WKTMR_ALARM_EVENT);
	54	}
	55
c4f07ece BN	56	static inline void brcmstb_waketmr_clear_alarm(struct brcmstb_waketmr *timer)
c4f07ece BN	57	{
516ae02c DB	58	u32 reg;
516ae02c DB	59
24304a87 DB	60	if (timer->alarm_en && timer->alarm_irq)
24304a87 DB	61	disable_irq(timer->alarm_irq);
516ae02c DB	62	timer->alarm_en = false;
	63	reg = readl_relaxed(timer->base + BRCMSTB_WKTMR_COUNTER);
	64	writel_relaxed(reg - 1, timer->base + BRCMSTB_WKTMR_ALARM);
90226f6b	65	writel_relaxed(WKTMR_ALARM_EVENT, timer->base + BRCMSTB_WKTMR_EVENT);
c4f07ece	66	(void)readl_relaxed(timer->base + BRCMSTB_WKTMR_EVENT);
e005a9b3 DB	67	if (timer->alarm_expired) {
	68	timer->alarm_expired = false;
	69	/* maintain call balance */
	70	enable_irq(timer->alarm_irq);
	71	}
c4f07ece BN	72	}
	73
	74	static void brcmstb_waketmr_set_alarm(struct brcmstb_waketmr *timer,
	75	unsigned int secs)
	76	{
516ae02c DB	77	unsigned int now;
516ae02c DB	78
c4f07ece BN	79	brcmstb_waketmr_clear_alarm(timer);
c4f07ece BN	80
58d3d5e7 JC	81	/* Make sure we are actually counting in seconds */
	82	writel_relaxed(timer->rate, timer->base + BRCMSTB_WKTMR_PRESCALER);
	83
516ae02c DB	84	writel_relaxed(secs, timer->base + BRCMSTB_WKTMR_ALARM);
	85	now = readl_relaxed(timer->base + BRCMSTB_WKTMR_COUNTER);
	86
	87	while ((int)(secs - now) <= 0 &&
	88	!brcmstb_waketmr_is_pending(timer)) {
	89	secs = now + 1;
	90	writel_relaxed(secs, timer->base + BRCMSTB_WKTMR_ALARM);
	91	now = readl_relaxed(timer->base + BRCMSTB_WKTMR_COUNTER);
	92	}
c4f07ece BN	93	}
	94
	95	static irqreturn_t brcmstb_waketmr_irq(int irq, void *data)
	96	{
	97	struct brcmstb_waketmr *timer = data;
	98
24304a87 DB	99	if (!timer->alarm_irq)
	100	pm_wakeup_event(timer->dev, 0);
	101	return IRQ_HANDLED;
	102	}
	103
	104	static irqreturn_t brcmstb_alarm_irq(int irq, void *data)
	105	{
	106	struct brcmstb_waketmr *timer = data;
	107
	108	/* Ignore spurious interrupts */
	109	if (!brcmstb_waketmr_is_pending(timer))
	110	return IRQ_HANDLED;
	111
	112	if (timer->alarm_en) {
e005a9b3 DB	113	if (device_may_wakeup(timer->dev)) {
	114	disable_irq_nosync(irq);
	115	timer->alarm_expired = true;
	116	} else {
24304a87 DB	117	writel_relaxed(WKTMR_ALARM_EVENT,
24304a87 DB	118	timer->base + BRCMSTB_WKTMR_EVENT);
e005a9b3	119	}
24304a87	120	rtc_update_irq(timer->rtc, 1, RTC_IRQF \| RTC_AF);
e005a9b3 DB	121	} else {
	122	writel_relaxed(WKTMR_ALARM_EVENT,
	123	timer->base + BRCMSTB_WKTMR_EVENT);
24304a87	124	}
c4f07ece BN	125
	126	return IRQ_HANDLED;
	127	}
	128
	129	struct wktmr_time {
	130	u32 sec;
	131	u32 pre;
	132	};
	133
	134	static void wktmr_read(struct brcmstb_waketmr *timer,
	135	struct wktmr_time *t)
	136	{
	137	u32 tmp;
	138
	139	do {
	140	t->sec = readl_relaxed(timer->base + BRCMSTB_WKTMR_COUNTER);
	141	tmp = readl_relaxed(timer->base + BRCMSTB_WKTMR_PRESCALER_VAL);
	142	} while (tmp >= timer->rate);
	143
	144	t->pre = timer->rate - tmp;
	145	}
	146
	147	static int brcmstb_waketmr_prepare_suspend(struct brcmstb_waketmr *timer)
	148	{
	149	struct device *dev = timer->dev;
24304a87	150	int ret;
c4f07ece BN	151
c4f07ece BN	152	if (device_may_wakeup(dev)) {
eae258ed	153	ret = enable_irq_wake(timer->wake_irq);
c4f07ece BN	154	if (ret) {
	155	dev_err(dev, "failed to enable wake-up interrupt\n");
	156	return ret;
	157	}
24304a87 DB	158	if (timer->alarm_en && timer->alarm_irq) {
	159	ret = enable_irq_wake(timer->alarm_irq);
	160	if (ret) {
	161	dev_err(dev, "failed to enable rtc interrupt\n");
	162	disable_irq_wake(timer->wake_irq);
	163	return ret;
	164	}
	165	}
c4f07ece BN	166	}
c4f07ece BN	167
24304a87	168	return 0;
c4f07ece BN	169	}
	170
	171	/* If enabled as a wakeup-source, arm the timer when powering off */
	172	static int brcmstb_waketmr_reboot(struct notifier_block *nb,
	173	unsigned long action, void *data)
	174	{
	175	struct brcmstb_waketmr *timer;
	176
	177	timer = container_of(nb, struct brcmstb_waketmr, reboot_notifier);
	178
	179	/* Set timer for cold boot */
	180	if (action == SYS_POWER_OFF)
	181	brcmstb_waketmr_prepare_suspend(timer);
	182
	183	return NOTIFY_DONE;
	184	}
	185
	186	static int brcmstb_waketmr_gettime(struct device *dev,
	187	struct rtc_time *tm)
	188	{
	189	struct brcmstb_waketmr *timer = dev_get_drvdata(dev);
	190	struct wktmr_time now;
	191
	192	wktmr_read(timer, &now);
	193
9a8f2d12	194	rtc_time64_to_tm(now.sec, tm);
c4f07ece BN	195
	196	return 0;
	197	}
	198
	199	static int brcmstb_waketmr_settime(struct device *dev,
	200	struct rtc_time *tm)
	201	{
	202	struct brcmstb_waketmr *timer = dev_get_drvdata(dev);
	203	time64_t sec;
	204
	205	sec = rtc_tm_to_time64(tm);
	206
c4f07ece BN	207	writel_relaxed(sec, timer->base + BRCMSTB_WKTMR_COUNTER);
	208
	209	return 0;
	210	}
	211
	212	static int brcmstb_waketmr_getalarm(struct device *dev,
	213	struct rtc_wkalrm *alarm)
	214	{
	215	struct brcmstb_waketmr *timer = dev_get_drvdata(dev);
c4f07ece	216
516ae02c DB	217	alarm->enabled = timer->alarm_en;
516ae02c DB	218	rtc_time64_to_tm(timer->rtc_alarm, &alarm->time);
c4f07ece	219
90226f6b	220	alarm->pending = brcmstb_waketmr_is_pending(timer);
c4f07ece BN	221
	222	return 0;
	223	}
	224
2cd98b22 DB	225	static int brcmstb_waketmr_alarm_enable(struct device *dev,
	226	unsigned int enabled)
	227	{
516ae02c DB	228	struct brcmstb_waketmr *timer = dev_get_drvdata(dev);
	229
	230	if (enabled && !timer->alarm_en) {
	231	if ((int)(readl_relaxed(timer->base + BRCMSTB_WKTMR_COUNTER) -
	232	readl_relaxed(timer->base + BRCMSTB_WKTMR_ALARM)) >= 0 &&
	233	!brcmstb_waketmr_is_pending(timer))
	234	return -EINVAL;
	235	timer->alarm_en = true;
e005a9b3 DB	236	if (timer->alarm_irq) {
	237	if (timer->alarm_expired) {
	238	timer->alarm_expired = false;
	239	/* maintain call balance */
	240	enable_irq(timer->alarm_irq);
	241	}
24304a87	242	enable_irq(timer->alarm_irq);
e005a9b3	243	}
516ae02c	244	} else if (!enabled && timer->alarm_en) {
24304a87 DB	245	if (timer->alarm_irq)
24304a87 DB	246	disable_irq(timer->alarm_irq);
516ae02c DB	247	timer->alarm_en = false;
	248	}
	249
2cd98b22 DB	250	return 0;
	251	}
	252
c4f07ece BN	253	static int brcmstb_waketmr_setalarm(struct device *dev,
	254	struct rtc_wkalrm *alarm)
	255	{
	256	struct brcmstb_waketmr *timer = dev_get_drvdata(dev);
c4f07ece	257
516ae02c	258	timer->rtc_alarm = rtc_tm_to_time64(&alarm->time);
c4f07ece	259
516ae02c	260	brcmstb_waketmr_set_alarm(timer, timer->rtc_alarm);
c4f07ece	261
2cd98b22	262	return brcmstb_waketmr_alarm_enable(dev, alarm->enabled);
c4f07ece BN	263	}
	264
	265	static const struct rtc_class_ops brcmstb_waketmr_ops = {
	266	.read_time = brcmstb_waketmr_gettime,
	267	.set_time = brcmstb_waketmr_settime,
	268	.read_alarm = brcmstb_waketmr_getalarm,
	269	.set_alarm = brcmstb_waketmr_setalarm,
	270	.alarm_irq_enable = brcmstb_waketmr_alarm_enable,
	271	};
	272
	273	static int brcmstb_waketmr_probe(struct platform_device *pdev)
	274	{
	275	struct device *dev = &pdev->dev;
	276	struct brcmstb_waketmr *timer;
c4f07ece BN	277	int ret;
	278
	279	timer = devm_kzalloc(dev, sizeof(*timer), GFP_KERNEL);
	280	if (!timer)
	281	return -ENOMEM;
	282
	283	platform_set_drvdata(pdev, timer);
	284	timer->dev = dev;
	285
09ef18bc	286	timer->base = devm_platform_ioremap_resource(pdev, 0);
c4f07ece BN	287	if (IS_ERR(timer->base))
	288	return PTR_ERR(timer->base);
	289
2abf286a AB	290	timer->rtc = devm_rtc_allocate_device(dev);
	291	if (IS_ERR(timer->rtc))
	292	return PTR_ERR(timer->rtc);
	293
c4f07ece BN	294	/*
	295	* Set wakeup capability before requesting wakeup interrupt, so we can
	296	* process boot-time "wakeups" (e.g., from S5 soft-off)
	297	*/
2cd98b22	298	device_init_wakeup(dev, true);
c4f07ece	299
eae258ed DB	300	ret = platform_get_irq(pdev, 0);
eae258ed DB	301	if (ret < 0)
c4f07ece	302	return -ENODEV;
eae258ed	303	timer->wake_irq = (unsigned int)ret;
c4f07ece BN	304
	305	timer->clk = devm_clk_get(dev, NULL);
	306	if (!IS_ERR(timer->clk)) {
	307	ret = clk_prepare_enable(timer->clk);
	308	if (ret)
	309	return ret;
	310	timer->rate = clk_get_rate(timer->clk);
	311	if (!timer->rate)
	312	timer->rate = BRCMSTB_WKTMR_DEFAULT_FREQ;
	313	} else {
	314	timer->rate = BRCMSTB_WKTMR_DEFAULT_FREQ;
	315	timer->clk = NULL;
	316	}
	317
eae258ed	318	ret = devm_request_irq(dev, timer->wake_irq, brcmstb_waketmr_irq, 0,
c4f07ece BN	319	"brcmstb-waketimer", timer);
c4f07ece BN	320	if (ret < 0)
f2eef045	321	goto err_clk;
c4f07ece	322
24304a87 DB	323	brcmstb_waketmr_clear_alarm(timer);
	324
	325	/* Attempt to initialize non-wake irq */
	326	ret = platform_get_irq(pdev, 1);
	327	if (ret > 0) {
	328	timer->alarm_irq = (unsigned int)ret;
	329	ret = devm_request_irq(dev, timer->alarm_irq, brcmstb_alarm_irq,
	330	IRQF_NO_AUTOEN, "brcmstb-waketimer-rtc",
	331	timer);
	332	if (ret < 0)
	333	timer->alarm_irq = 0;
	334	}
	335
c4f07ece BN	336	timer->reboot_notifier.notifier_call = brcmstb_waketmr_reboot;
	337	register_reboot_notifier(&timer->reboot_notifier);
	338
2abf286a	339	timer->rtc->ops = &brcmstb_waketmr_ops;
ded67666	340	timer->rtc->range_max = U32_MAX;
2abf286a	341
fdcfd854	342	ret = devm_rtc_register_device(timer->rtc);
44c638ce	343	if (ret)
f2eef045	344	goto err_notifier;
c4f07ece	345
f2eef045 AK	346	return 0;
	347
	348	err_notifier:
	349	unregister_reboot_notifier(&timer->reboot_notifier);
	350
	351	err_clk:
910d002d	352	clk_disable_unprepare(timer->clk);
f2eef045	353
c4f07ece BN	354	return ret;
	355	}
	356
d64906b3	357	static void brcmstb_waketmr_remove(struct platform_device *pdev)
c4f07ece BN	358	{
	359	struct brcmstb_waketmr *timer = dev_get_drvdata(&pdev->dev);
	360
	361	unregister_reboot_notifier(&timer->reboot_notifier);
94303f89	362	clk_disable_unprepare(timer->clk);
c4f07ece BN	363	}
	364
	365	#ifdef CONFIG_PM_SLEEP
	366	static int brcmstb_waketmr_suspend(struct device *dev)
	367	{
	368	struct brcmstb_waketmr *timer = dev_get_drvdata(dev);
	369
	370	return brcmstb_waketmr_prepare_suspend(timer);
	371	}
	372
e005a9b3 DB	373	static int brcmstb_waketmr_suspend_noirq(struct device *dev)
	374	{
	375	struct brcmstb_waketmr *timer = dev_get_drvdata(dev);
	376
	377	/* Catch any alarms occurring prior to noirq */
	378	if (timer->alarm_expired && device_may_wakeup(dev))
	379	return -EBUSY;
	380
	381	return 0;
	382	}
	383
c4f07ece BN	384	static int brcmstb_waketmr_resume(struct device *dev)
	385	{
	386	struct brcmstb_waketmr *timer = dev_get_drvdata(dev);
	387	int ret;
	388
	389	if (!device_may_wakeup(dev))
	390	return 0;
	391
eae258ed	392	ret = disable_irq_wake(timer->wake_irq);
24304a87 DB	393	if (timer->alarm_en && timer->alarm_irq)
24304a87 DB	394	disable_irq_wake(timer->alarm_irq);
c4f07ece BN	395
	396	brcmstb_waketmr_clear_alarm(timer);
	397
	398	return ret;
	399	}
e005a9b3 DB	400	#else
	401	#define brcmstb_waketmr_suspend NULL
	402	#define brcmstb_waketmr_suspend_noirq NULL
	403	#define brcmstb_waketmr_resume NULL
c4f07ece BN	404	#endif /* CONFIG_PM_SLEEP */
c4f07ece BN	405
e005a9b3 DB	406	static const struct dev_pm_ops brcmstb_waketmr_pm_ops = {
	407	.suspend = brcmstb_waketmr_suspend,
	408	.suspend_noirq = brcmstb_waketmr_suspend_noirq,
	409	.resume = brcmstb_waketmr_resume,
	410	};
c4f07ece	411
ae1247f7	412	static const __maybe_unused struct of_device_id brcmstb_waketmr_of_match[] = {
c4f07ece BN	413	{ .compatible = "brcm,brcmstb-waketimer" },
	414	{ /* sentinel */ },
	415	};
	416
	417	static struct platform_driver brcmstb_waketmr_driver = {
	418	.probe = brcmstb_waketmr_probe,
e5eab1ae	419	.remove = brcmstb_waketmr_remove,
c4f07ece BN	420	.driver = {
	421	.name = "brcmstb-waketimer",
	422	.pm = &brcmstb_waketmr_pm_ops,
	423	.of_match_table = of_match_ptr(brcmstb_waketmr_of_match),
	424	}
	425	};
	426	module_platform_driver(brcmstb_waketmr_driver);
	427
	428	MODULE_LICENSE("GPL v2");
	429	MODULE_AUTHOR("Brian Norris");
	430	MODULE_AUTHOR("Markus Mayer");
24304a87	431	MODULE_AUTHOR("Doug Berger");
c4f07ece	432	MODULE_DESCRIPTION("Wake-up timer driver for STB chips");