[linux-block.git] / drivers / rtc / rtc-mt6397.c

// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2014-2015 MediaTek Inc.
* Author: Tianping.Fang <tianping.fang@mediatek.com>
*/

#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/mfd/mt6397/core.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/rtc.h>
#include <linux/mfd/mt6397/rtc.h>
#include <linux/mod_devicetable.h>

static int mtk_rtc_write_trigger(struct mt6397_rtc *rtc)
{
	int ret;
	u32 data;

	ret = regmap_write(rtc->regmap, rtc->addr_base + rtc->data->wrtgr, 1);
	if (ret < 0)
		return ret;

	ret = regmap_read_poll_timeout(rtc->regmap,
					rtc->addr_base + RTC_BBPU, data,
					!(data & RTC_BBPU_CBUSY),
					MTK_RTC_POLL_DELAY_US,
					MTK_RTC_POLL_TIMEOUT);
	if (ret < 0)
		dev_err(rtc->dev, "failed to write WRTGE: %d\n", ret);

	return ret;
}

static irqreturn_t mtk_rtc_irq_handler_thread(int irq, void *data)
{
	struct mt6397_rtc *rtc = data;
	u32 irqsta, irqen;
	int ret;

	ret = regmap_read(rtc->regmap, rtc->addr_base + RTC_IRQ_STA, &irqsta);
	if ((ret >= 0) && (irqsta & RTC_IRQ_STA_AL)) {
		rtc_update_irq(rtc->rtc_dev, 1, RTC_IRQF | RTC_AF);
		irqen = irqsta & ~RTC_IRQ_EN_AL;
		mutex_lock(&rtc->lock);
		if (regmap_write(rtc->regmap, rtc->addr_base + RTC_IRQ_EN,
				 irqen) == 0)
			mtk_rtc_write_trigger(rtc);
		mutex_unlock(&rtc->lock);

		return IRQ_HANDLED;
	}

	return IRQ_NONE;
}

static int __mtk_rtc_read_time(struct mt6397_rtc *rtc,
			       struct rtc_time *tm, int *sec)
{
	int ret;
	u16 data[RTC_OFFSET_COUNT];

	mutex_lock(&rtc->lock);
	ret = regmap_bulk_read(rtc->regmap, rtc->addr_base + RTC_TC_SEC,
			       data, RTC_OFFSET_COUNT);
	if (ret < 0)
		goto exit;

	tm->tm_sec = data[RTC_OFFSET_SEC];
	tm->tm_min = data[RTC_OFFSET_MIN];
	tm->tm_hour = data[RTC_OFFSET_HOUR];
	tm->tm_mday = data[RTC_OFFSET_DOM];
	tm->tm_mon = data[RTC_OFFSET_MTH];
	tm->tm_year = data[RTC_OFFSET_YEAR];

	ret = regmap_read(rtc->regmap, rtc->addr_base + RTC_TC_SEC, sec);
exit:
	mutex_unlock(&rtc->lock);
	return ret;
}

static int mtk_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
	time64_t time;
	struct mt6397_rtc *rtc = dev_get_drvdata(dev);
	int days, sec, ret;

	do {
		ret = __mtk_rtc_read_time(rtc, tm, &sec);
		if (ret < 0)
			goto exit;
	} while (sec < tm->tm_sec);

	/* HW register use 7 bits to store year data, minus
	 * RTC_MIN_YEAR_OFFSET before write year data to register, and plus
	 * RTC_MIN_YEAR_OFFSET back after read year from register
	 */
	tm->tm_year += RTC_MIN_YEAR_OFFSET;

	/* HW register start mon from one, but tm_mon start from zero. */
	tm->tm_mon--;
	time = rtc_tm_to_time64(tm);

	/* rtc_tm_to_time64 covert Gregorian date to seconds since
	 * 01-01-1970 00:00:00, and this date is Thursday.
	 */
	days = div_s64(time, 86400);
	tm->tm_wday = (days + 4) % 7;

exit:
	return ret;
}

static int mtk_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
	struct mt6397_rtc *rtc = dev_get_drvdata(dev);
	int ret;
	u16 data[RTC_OFFSET_COUNT];

	tm->tm_year -= RTC_MIN_YEAR_OFFSET;
	tm->tm_mon++;

	data[RTC_OFFSET_SEC] = tm->tm_sec;
	data[RTC_OFFSET_MIN] = tm->tm_min;
	data[RTC_OFFSET_HOUR] = tm->tm_hour;
	data[RTC_OFFSET_DOM] = tm->tm_mday;
	data[RTC_OFFSET_MTH] = tm->tm_mon;
	data[RTC_OFFSET_YEAR] = tm->tm_year;

	mutex_lock(&rtc->lock);
	ret = regmap_bulk_write(rtc->regmap, rtc->addr_base + RTC_TC_SEC,
				data, RTC_OFFSET_COUNT);
	if (ret < 0)
		goto exit;

	/* Time register write to hardware after call trigger function */
	ret = mtk_rtc_write_trigger(rtc);

exit:
	mutex_unlock(&rtc->lock);
	return ret;
}

static int mtk_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
{
	struct rtc_time *tm = &alm->time;
	struct mt6397_rtc *rtc = dev_get_drvdata(dev);
	u32 irqen, pdn2;
	int ret;
	u16 data[RTC_OFFSET_COUNT];

	mutex_lock(&rtc->lock);
	ret = regmap_read(rtc->regmap, rtc->addr_base + RTC_IRQ_EN, &irqen);
	if (ret < 0)
		goto err_exit;
	ret = regmap_read(rtc->regmap, rtc->addr_base + RTC_PDN2, &pdn2);
	if (ret < 0)
		goto err_exit;

	ret = regmap_bulk_read(rtc->regmap, rtc->addr_base + RTC_AL_SEC,
			       data, RTC_OFFSET_COUNT);
	if (ret < 0)
		goto err_exit;

	alm->enabled = !!(irqen & RTC_IRQ_EN_AL);
	alm->pending = !!(pdn2 & RTC_PDN2_PWRON_ALARM);
	mutex_unlock(&rtc->lock);

	tm->tm_sec = data[RTC_OFFSET_SEC] & RTC_AL_SEC_MASK;
	tm->tm_min = data[RTC_OFFSET_MIN] & RTC_AL_MIN_MASK;
	tm->tm_hour = data[RTC_OFFSET_HOUR] & RTC_AL_HOU_MASK;
	tm->tm_mday = data[RTC_OFFSET_DOM] & RTC_AL_DOM_MASK;
	tm->tm_mon = data[RTC_OFFSET_MTH] & RTC_AL_MTH_MASK;
	tm->tm_year = data[RTC_OFFSET_YEAR] & RTC_AL_YEA_MASK;

	tm->tm_year += RTC_MIN_YEAR_OFFSET;
	tm->tm_mon--;

	return 0;
err_exit:
	mutex_unlock(&rtc->lock);
	return ret;
}

static int mtk_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
{
	struct rtc_time *tm = &alm->time;
	struct mt6397_rtc *rtc = dev_get_drvdata(dev);
	int ret;
	u16 data[RTC_OFFSET_COUNT];

	tm->tm_year -= RTC_MIN_YEAR_OFFSET;
	tm->tm_mon++;

	mutex_lock(&rtc->lock);
	ret = regmap_bulk_read(rtc->regmap, rtc->addr_base + RTC_AL_SEC,
			       data, RTC_OFFSET_COUNT);
	if (ret < 0)
		goto exit;

	data[RTC_OFFSET_SEC] = ((data[RTC_OFFSET_SEC] & ~(RTC_AL_SEC_MASK)) |
				(tm->tm_sec & RTC_AL_SEC_MASK));
	data[RTC_OFFSET_MIN] = ((data[RTC_OFFSET_MIN] & ~(RTC_AL_MIN_MASK)) |
				(tm->tm_min & RTC_AL_MIN_MASK));
	data[RTC_OFFSET_HOUR] = ((data[RTC_OFFSET_HOUR] & ~(RTC_AL_HOU_MASK)) |
				(tm->tm_hour & RTC_AL_HOU_MASK));
	data[RTC_OFFSET_DOM] = ((data[RTC_OFFSET_DOM] & ~(RTC_AL_DOM_MASK)) |
				(tm->tm_mday & RTC_AL_DOM_MASK));
	data[RTC_OFFSET_MTH] = ((data[RTC_OFFSET_MTH] & ~(RTC_AL_MTH_MASK)) |
				(tm->tm_mon & RTC_AL_MTH_MASK));
	data[RTC_OFFSET_YEAR] = ((data[RTC_OFFSET_YEAR] & ~(RTC_AL_YEA_MASK)) |
				(tm->tm_year & RTC_AL_YEA_MASK));

	if (alm->enabled) {
		ret = regmap_bulk_write(rtc->regmap,
					rtc->addr_base + RTC_AL_SEC,
					data, RTC_OFFSET_COUNT);
		if (ret < 0)
			goto exit;
		ret = regmap_write(rtc->regmap, rtc->addr_base + RTC_AL_MASK,
				   RTC_AL_MASK_DOW);
		if (ret < 0)
			goto exit;
		ret = regmap_update_bits(rtc->regmap,
					 rtc->addr_base + RTC_IRQ_EN,
					 RTC_IRQ_EN_ONESHOT_AL,
					 RTC_IRQ_EN_ONESHOT_AL);
		if (ret < 0)
			goto exit;
	} else {
		ret = regmap_update_bits(rtc->regmap,
					 rtc->addr_base + RTC_IRQ_EN,
					 RTC_IRQ_EN_ONESHOT_AL, 0);
		if (ret < 0)
			goto exit;
	}

	/* All alarm time register write to hardware after calling
	 * mtk_rtc_write_trigger. This can avoid race condition if alarm
	 * occur happen during writing alarm time register.
	 */
	ret = mtk_rtc_write_trigger(rtc);
exit:
	mutex_unlock(&rtc->lock);
	return ret;
}

static const struct rtc_class_ops mtk_rtc_ops = {
	.read_time  = mtk_rtc_read_time,
	.set_time   = mtk_rtc_set_time,
	.read_alarm = mtk_rtc_read_alarm,
	.set_alarm  = mtk_rtc_set_alarm,
};

static int mtk_rtc_probe(struct platform_device *pdev)
{
	struct resource *res;
	struct mt6397_chip *mt6397_chip = dev_get_drvdata(pdev->dev.parent);
	struct mt6397_rtc *rtc;
	int ret;

	rtc = devm_kzalloc(&pdev->dev, sizeof(struct mt6397_rtc), GFP_KERNEL);
	if (!rtc)
		return -ENOMEM;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	rtc->addr_base = res->start;

	rtc->data = of_device_get_match_data(&pdev->dev);

	rtc->irq = platform_get_irq(pdev, 0);
	if (rtc->irq < 0)
		return rtc->irq;

	rtc->regmap = mt6397_chip->regmap;
	mutex_init(&rtc->lock);

	platform_set_drvdata(pdev, rtc);

	rtc->rtc_dev = devm_rtc_allocate_device(&pdev->dev);
	if (IS_ERR(rtc->rtc_dev))
		return PTR_ERR(rtc->rtc_dev);

	ret = devm_request_threaded_irq(&pdev->dev, rtc->irq, NULL,
					mtk_rtc_irq_handler_thread,
					IRQF_ONESHOT | IRQF_TRIGGER_HIGH,
					"mt6397-rtc", rtc);

	if (ret) {
		dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n",
			rtc->irq, ret);
		return ret;
	}

	device_init_wakeup(&pdev->dev, 1);

	rtc->rtc_dev->ops = &mtk_rtc_ops;

	return rtc_register_device(rtc->rtc_dev);
}

#ifdef CONFIG_PM_SLEEP
static int mt6397_rtc_suspend(struct device *dev)
{
	struct mt6397_rtc *rtc = dev_get_drvdata(dev);

	if (device_may_wakeup(dev))
		enable_irq_wake(rtc->irq);

	return 0;
}

static int mt6397_rtc_resume(struct device *dev)
{
	struct mt6397_rtc *rtc = dev_get_drvdata(dev);

	if (device_may_wakeup(dev))
		disable_irq_wake(rtc->irq);

	return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(mt6397_pm_ops, mt6397_rtc_suspend,
			mt6397_rtc_resume);

static const struct mtk_rtc_data mt6358_rtc_data = {
	.wrtgr = RTC_WRTGR_MT6358,
};

static const struct mtk_rtc_data mt6397_rtc_data = {
	.wrtgr = RTC_WRTGR_MT6397,
};

static const struct of_device_id mt6397_rtc_of_match[] = {
	{ .compatible = "mediatek,mt6323-rtc", .data = &mt6397_rtc_data },
	{ .compatible = "mediatek,mt6358-rtc", .data = &mt6358_rtc_data },
	{ .compatible = "mediatek,mt6397-rtc", .data = &mt6397_rtc_data },
	{ }
};
MODULE_DEVICE_TABLE(of, mt6397_rtc_of_match);

static struct platform_driver mtk_rtc_driver = {
	.driver = {
		.name = "mt6397-rtc",
		.of_match_table = mt6397_rtc_of_match,
		.pm = &mt6397_pm_ops,
	},
	.probe	= mtk_rtc_probe,
};

module_platform_driver(mtk_rtc_driver);

MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Tianping Fang <tianping.fang@mediatek.com>");
MODULE_DESCRIPTION("RTC Driver for MediaTek MT6397 PMIC");
Commit	Line	Data
1802d0be	1	// SPDX-License-Identifier: GPL-2.0-only
fc297911 TF	2	/*
	3	* Copyright (c) 2014-2015 MediaTek Inc.
	4	* Author: Tianping.Fang <tianping.fang@mediatek.com>
fc297911 TF	5	*/
fc297911 TF	6
851b8714 JF	7	#include <linux/err.h>
	8	#include <linux/interrupt.h>
	9	#include <linux/mfd/mt6397/core.h>
fc297911	10	#include <linux/module.h>
851b8714	11	#include <linux/mutex.h>
29ee4009	12	#include <linux/of_device.h>
851b8714	13	#include <linux/platform_device.h>
fc297911 TF	14	#include <linux/regmap.h>
fc297911 TF	15	#include <linux/rtc.h>
c512995c	16	#include <linux/mfd/mt6397/rtc.h>
851b8714	17	#include <linux/mod_devicetable.h>
fc297911 TF	18
	19	static int mtk_rtc_write_trigger(struct mt6397_rtc *rtc)
	20	{
fc297911 TF	21	int ret;
	22	u32 data;
	23
29ee4009	24	ret = regmap_write(rtc->regmap, rtc->addr_base + rtc->data->wrtgr, 1);
fc297911 TF	25	if (ret < 0)
	26	return ret;
	27
851b8714 JF	28	ret = regmap_read_poll_timeout(rtc->regmap,
	29	rtc->addr_base + RTC_BBPU, data,
	30	!(data & RTC_BBPU_CBUSY),
	31	MTK_RTC_POLL_DELAY_US,
	32	MTK_RTC_POLL_TIMEOUT);
	33	if (ret < 0)
	34	dev_err(rtc->dev, "failed to write WRTGE: %d\n", ret);
fc297911 TF	35
	36	return ret;
	37	}
	38
	39	static irqreturn_t mtk_rtc_irq_handler_thread(int irq, void *data)
	40	{
	41	struct mt6397_rtc *rtc = data;
	42	u32 irqsta, irqen;
	43	int ret;
	44
	45	ret = regmap_read(rtc->regmap, rtc->addr_base + RTC_IRQ_STA, &irqsta);
	46	if ((ret >= 0) && (irqsta & RTC_IRQ_STA_AL)) {
	47	rtc_update_irq(rtc->rtc_dev, 1, RTC_IRQF \| RTC_AF);
	48	irqen = irqsta & ~RTC_IRQ_EN_AL;
	49	mutex_lock(&rtc->lock);
	50	if (regmap_write(rtc->regmap, rtc->addr_base + RTC_IRQ_EN,
653997ee	51	irqen) == 0)
fc297911 TF	52	mtk_rtc_write_trigger(rtc);
	53	mutex_unlock(&rtc->lock);
	54
	55	return IRQ_HANDLED;
	56	}
	57
	58	return IRQ_NONE;
	59	}
	60
	61	static int __mtk_rtc_read_time(struct mt6397_rtc *rtc,
	62	struct rtc_time tm, int sec)
	63	{
	64	int ret;
	65	u16 data[RTC_OFFSET_COUNT];
	66
	67	mutex_lock(&rtc->lock);
	68	ret = regmap_bulk_read(rtc->regmap, rtc->addr_base + RTC_TC_SEC,
	69	data, RTC_OFFSET_COUNT);
	70	if (ret < 0)
	71	goto exit;
	72
	73	tm->tm_sec = data[RTC_OFFSET_SEC];
	74	tm->tm_min = data[RTC_OFFSET_MIN];
	75	tm->tm_hour = data[RTC_OFFSET_HOUR];
	76	tm->tm_mday = data[RTC_OFFSET_DOM];
	77	tm->tm_mon = data[RTC_OFFSET_MTH];
	78	tm->tm_year = data[RTC_OFFSET_YEAR];
	79
	80	ret = regmap_read(rtc->regmap, rtc->addr_base + RTC_TC_SEC, sec);
	81	exit:
	82	mutex_unlock(&rtc->lock);
	83	return ret;
	84	}
	85
	86	static int mtk_rtc_read_time(struct device dev, struct rtc_time tm)
	87	{
	88	time64_t time;
	89	struct mt6397_rtc *rtc = dev_get_drvdata(dev);
93939967	90	int days, sec, ret;
fc297911 TF	91
	92	do {
	93	ret = __mtk_rtc_read_time(rtc, tm, &sec);
	94	if (ret < 0)
	95	goto exit;
	96	} while (sec < tm->tm_sec);
	97
	98	/* HW register use 7 bits to store year data, minus
	99	* RTC_MIN_YEAR_OFFSET before write year data to register, and plus
	100	* RTC_MIN_YEAR_OFFSET back after read year from register
	101	*/
	102	tm->tm_year += RTC_MIN_YEAR_OFFSET;
	103
	104	/* HW register start mon from one, but tm_mon start from zero. */
	105	tm->tm_mon--;
	106	time = rtc_tm_to_time64(tm);
	107
	108	/* rtc_tm_to_time64 covert Gregorian date to seconds since
	109	* 01-01-1970 00:00:00, and this date is Thursday.
	110	*/
93939967 AB	111	days = div_s64(time, 86400);
93939967 AB	112	tm->tm_wday = (days + 4) % 7;
fc297911 TF	113
	114	exit:
	115	return ret;
	116	}
	117
	118	static int mtk_rtc_set_time(struct device dev, struct rtc_time tm)
	119	{
	120	struct mt6397_rtc *rtc = dev_get_drvdata(dev);
	121	int ret;
	122	u16 data[RTC_OFFSET_COUNT];
	123
	124	tm->tm_year -= RTC_MIN_YEAR_OFFSET;
	125	tm->tm_mon++;
	126
	127	data[RTC_OFFSET_SEC] = tm->tm_sec;
	128	data[RTC_OFFSET_MIN] = tm->tm_min;
	129	data[RTC_OFFSET_HOUR] = tm->tm_hour;
	130	data[RTC_OFFSET_DOM] = tm->tm_mday;
	131	data[RTC_OFFSET_MTH] = tm->tm_mon;
	132	data[RTC_OFFSET_YEAR] = tm->tm_year;
	133
	134	mutex_lock(&rtc->lock);
	135	ret = regmap_bulk_write(rtc->regmap, rtc->addr_base + RTC_TC_SEC,
	136	data, RTC_OFFSET_COUNT);
	137	if (ret < 0)
	138	goto exit;
	139
	140	/* Time register write to hardware after call trigger function */
	141	ret = mtk_rtc_write_trigger(rtc);
	142
	143	exit:
	144	mutex_unlock(&rtc->lock);
	145	return ret;
	146	}
	147
	148	static int mtk_rtc_read_alarm(struct device dev, struct rtc_wkalrm alm)
	149	{
	150	struct rtc_time *tm = &alm->time;
	151	struct mt6397_rtc *rtc = dev_get_drvdata(dev);
	152	u32 irqen, pdn2;
	153	int ret;
	154	u16 data[RTC_OFFSET_COUNT];
	155
	156	mutex_lock(&rtc->lock);
	157	ret = regmap_read(rtc->regmap, rtc->addr_base + RTC_IRQ_EN, &irqen);
	158	if (ret < 0)
	159	goto err_exit;
	160	ret = regmap_read(rtc->regmap, rtc->addr_base + RTC_PDN2, &pdn2);
	161	if (ret < 0)
	162	goto err_exit;
	163
	164	ret = regmap_bulk_read(rtc->regmap, rtc->addr_base + RTC_AL_SEC,
	165	data, RTC_OFFSET_COUNT);
	166	if (ret < 0)
	167	goto err_exit;
	168
	169	alm->enabled = !!(irqen & RTC_IRQ_EN_AL);
	170	alm->pending = !!(pdn2 & RTC_PDN2_PWRON_ALARM);
	171	mutex_unlock(&rtc->lock);
	172
653997ee RB	173	tm->tm_sec = data[RTC_OFFSET_SEC] & RTC_AL_SEC_MASK;
	174	tm->tm_min = data[RTC_OFFSET_MIN] & RTC_AL_MIN_MASK;
	175	tm->tm_hour = data[RTC_OFFSET_HOUR] & RTC_AL_HOU_MASK;
	176	tm->tm_mday = data[RTC_OFFSET_DOM] & RTC_AL_DOM_MASK;
	177	tm->tm_mon = data[RTC_OFFSET_MTH] & RTC_AL_MTH_MASK;
	178	tm->tm_year = data[RTC_OFFSET_YEAR] & RTC_AL_YEA_MASK;
fc297911 TF	179
	180	tm->tm_year += RTC_MIN_YEAR_OFFSET;
	181	tm->tm_mon--;
	182
	183	return 0;
	184	err_exit:
	185	mutex_unlock(&rtc->lock);
	186	return ret;
	187	}
	188
	189	static int mtk_rtc_set_alarm(struct device dev, struct rtc_wkalrm alm)
	190	{
	191	struct rtc_time *tm = &alm->time;
	192	struct mt6397_rtc *rtc = dev_get_drvdata(dev);
	193	int ret;
	194	u16 data[RTC_OFFSET_COUNT];
	195
	196	tm->tm_year -= RTC_MIN_YEAR_OFFSET;
	197	tm->tm_mon++;
	198
fc297911	199	mutex_lock(&rtc->lock);
653997ee RB	200	ret = regmap_bulk_read(rtc->regmap, rtc->addr_base + RTC_AL_SEC,
	201	data, RTC_OFFSET_COUNT);
	202	if (ret < 0)
	203	goto exit;
	204
	205	data[RTC_OFFSET_SEC] = ((data[RTC_OFFSET_SEC] & ~(RTC_AL_SEC_MASK)) \|
	206	(tm->tm_sec & RTC_AL_SEC_MASK));
	207	data[RTC_OFFSET_MIN] = ((data[RTC_OFFSET_MIN] & ~(RTC_AL_MIN_MASK)) \|
	208	(tm->tm_min & RTC_AL_MIN_MASK));
	209	data[RTC_OFFSET_HOUR] = ((data[RTC_OFFSET_HOUR] & ~(RTC_AL_HOU_MASK)) \|
	210	(tm->tm_hour & RTC_AL_HOU_MASK));
	211	data[RTC_OFFSET_DOM] = ((data[RTC_OFFSET_DOM] & ~(RTC_AL_DOM_MASK)) \|
	212	(tm->tm_mday & RTC_AL_DOM_MASK));
	213	data[RTC_OFFSET_MTH] = ((data[RTC_OFFSET_MTH] & ~(RTC_AL_MTH_MASK)) \|
	214	(tm->tm_mon & RTC_AL_MTH_MASK));
	215	data[RTC_OFFSET_YEAR] = ((data[RTC_OFFSET_YEAR] & ~(RTC_AL_YEA_MASK)) \|
	216	(tm->tm_year & RTC_AL_YEA_MASK));
	217
fc297911 TF	218	if (alm->enabled) {
	219	ret = regmap_bulk_write(rtc->regmap,
	220	rtc->addr_base + RTC_AL_SEC,
	221	data, RTC_OFFSET_COUNT);
	222	if (ret < 0)
	223	goto exit;
	224	ret = regmap_write(rtc->regmap, rtc->addr_base + RTC_AL_MASK,
	225	RTC_AL_MASK_DOW);
	226	if (ret < 0)
	227	goto exit;
	228	ret = regmap_update_bits(rtc->regmap,
	229	rtc->addr_base + RTC_IRQ_EN,
	230	RTC_IRQ_EN_ONESHOT_AL,
	231	RTC_IRQ_EN_ONESHOT_AL);
	232	if (ret < 0)
	233	goto exit;
	234	} else {
	235	ret = regmap_update_bits(rtc->regmap,
	236	rtc->addr_base + RTC_IRQ_EN,
	237	RTC_IRQ_EN_ONESHOT_AL, 0);
	238	if (ret < 0)
	239	goto exit;
	240	}
	241
	242	/* All alarm time register write to hardware after calling
	243	* mtk_rtc_write_trigger. This can avoid race condition if alarm
	244	* occur happen during writing alarm time register.
	245	*/
	246	ret = mtk_rtc_write_trigger(rtc);
	247	exit:
	248	mutex_unlock(&rtc->lock);
	249	return ret;
	250	}
	251
34c7b3ac	252	static const struct rtc_class_ops mtk_rtc_ops = {
fc297911 TF	253	.read_time = mtk_rtc_read_time,
	254	.set_time = mtk_rtc_set_time,
	255	.read_alarm = mtk_rtc_read_alarm,
	256	.set_alarm = mtk_rtc_set_alarm,
	257	};
	258
	259	static int mtk_rtc_probe(struct platform_device *pdev)
	260	{
	261	struct resource *res;
	262	struct mt6397_chip *mt6397_chip = dev_get_drvdata(pdev->dev.parent);
	263	struct mt6397_rtc *rtc;
	264	int ret;
	265
	266	rtc = devm_kzalloc(&pdev->dev, sizeof(struct mt6397_rtc), GFP_KERNEL);
	267	if (!rtc)
	268	return -ENOMEM;
	269
	270	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	271	rtc->addr_base = res->start;
	272
29ee4009 RB	273	rtc->data = of_device_get_match_data(&pdev->dev);
29ee4009 RB	274
e695d3a0 CZ	275	rtc->irq = platform_get_irq(pdev, 0);
	276	if (rtc->irq < 0)
	277	return rtc->irq;
fc297911 TF	278
fc297911 TF	279	rtc->regmap = mt6397_chip->regmap;
fc297911 TF	280	mutex_init(&rtc->lock);
	281
	282	platform_set_drvdata(pdev, rtc);
	283
851b8714	284	rtc->rtc_dev = devm_rtc_allocate_device(&pdev->dev);
babab2f8 AB	285	if (IS_ERR(rtc->rtc_dev))
	286	return PTR_ERR(rtc->rtc_dev);
	287
851b8714 JF	288	ret = devm_request_threaded_irq(&pdev->dev, rtc->irq, NULL,
	289	mtk_rtc_irq_handler_thread,
	290	IRQF_ONESHOT \| IRQF_TRIGGER_HIGH,
	291	"mt6397-rtc", rtc);
	292
fc297911 TF	293	if (ret) {
	294	dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n",
	295	rtc->irq, ret);
24db953e	296	return ret;
fc297911 TF	297	}
fc297911 TF	298
baeca449 WNH	299	device_init_wakeup(&pdev->dev, 1);
baeca449 WNH	300
babab2f8 AB	301	rtc->rtc_dev->ops = &mtk_rtc_ops;
babab2f8 AB	302
751438bc	303	return rtc_register_device(rtc->rtc_dev);
fc297911 TF	304	}
fc297911 TF	305
d7f9777d HC	306	#ifdef CONFIG_PM_SLEEP
	307	static int mt6397_rtc_suspend(struct device *dev)
	308	{
	309	struct mt6397_rtc *rtc = dev_get_drvdata(dev);
	310
	311	if (device_may_wakeup(dev))
	312	enable_irq_wake(rtc->irq);
	313
	314	return 0;
	315	}
	316
	317	static int mt6397_rtc_resume(struct device *dev)
	318	{
	319	struct mt6397_rtc *rtc = dev_get_drvdata(dev);
	320
	321	if (device_may_wakeup(dev))
	322	disable_irq_wake(rtc->irq);
	323
	324	return 0;
	325	}
	326	#endif
	327
	328	static SIMPLE_DEV_PM_OPS(mt6397_pm_ops, mt6397_rtc_suspend,
	329	mt6397_rtc_resume);
	330
29ee4009 RB	331	static const struct mtk_rtc_data mt6358_rtc_data = {
	332	.wrtgr = RTC_WRTGR_MT6358,
	333	};
	334
	335	static const struct mtk_rtc_data mt6397_rtc_data = {
	336	.wrtgr = RTC_WRTGR_MT6397,
	337	};
	338
fc297911	339	static const struct of_device_id mt6397_rtc_of_match[] = {
29ee4009 RB	340	{ .compatible = "mediatek,mt6323-rtc", .data = &mt6397_rtc_data },
	341	{ .compatible = "mediatek,mt6358-rtc", .data = &mt6358_rtc_data },
	342	{ .compatible = "mediatek,mt6397-rtc", .data = &mt6397_rtc_data },
fc297911 TF	343	{ }
fc297911 TF	344	};
73798d5c	345	MODULE_DEVICE_TABLE(of, mt6397_rtc_of_match);
fc297911 TF	346
	347	static struct platform_driver mtk_rtc_driver = {
	348	.driver = {
	349	.name = "mt6397-rtc",
	350	.of_match_table = mt6397_rtc_of_match,
d7f9777d	351	.pm = &mt6397_pm_ops,
fc297911 TF	352	},
fc297911 TF	353	.probe = mtk_rtc_probe,
fc297911 TF	354	};
	355
	356	module_platform_driver(mtk_rtc_driver);
	357
	358	MODULE_LICENSE("GPL v2");
	359	MODULE_AUTHOR("Tianping Fang <tianping.fang@mediatek.com>");
	360	MODULE_DESCRIPTION("RTC Driver for MediaTek MT6397 PMIC");