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

/*
* Copyright (c) 2014-2015 MediaTek Inc.
* Author: Tianping.Fang <[email protected]>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU General Public License for more details.
*/

#include <linux/delay.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/rtc.h>
#include <linux/irqdomain.h>
#include <linux/platform_device.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/io.h>
#include <linux/mfd/mt6397/core.h>

#define RTC_BBPU		0x0000
#define RTC_BBPU_CBUSY		BIT(6)

#define RTC_WRTGR		0x003c

#define RTC_IRQ_STA		0x0002
#define RTC_IRQ_STA_AL		BIT(0)
#define RTC_IRQ_STA_LP		BIT(3)

#define RTC_IRQ_EN		0x0004
#define RTC_IRQ_EN_AL		BIT(0)
#define RTC_IRQ_EN_ONESHOT	BIT(2)
#define RTC_IRQ_EN_LP		BIT(3)
#define RTC_IRQ_EN_ONESHOT_AL	(RTC_IRQ_EN_ONESHOT | RTC_IRQ_EN_AL)

#define RTC_AL_MASK		0x0008
#define RTC_AL_MASK_DOW		BIT(4)

#define RTC_TC_SEC		0x000a
/* Min, Hour, Dom... register offset to RTC_TC_SEC */
#define RTC_OFFSET_SEC		0
#define RTC_OFFSET_MIN		1
#define RTC_OFFSET_HOUR		2
#define RTC_OFFSET_DOM		3
#define RTC_OFFSET_DOW		4
#define RTC_OFFSET_MTH		5
#define RTC_OFFSET_YEAR		6
#define RTC_OFFSET_COUNT	7

#define RTC_AL_SEC		0x0018

#define RTC_PDN2		0x002e
#define RTC_PDN2_PWRON_ALARM	BIT(4)

#define RTC_MIN_YEAR		1968
#define RTC_BASE_YEAR		1900
#define RTC_NUM_YEARS		128
#define RTC_MIN_YEAR_OFFSET	(RTC_MIN_YEAR - RTC_BASE_YEAR)

struct mt6397_rtc {
	struct device		*dev;
	struct rtc_device	*rtc_dev;
	struct mutex		lock;
	struct regmap		*regmap;
	int			irq;
	u32			addr_base;
};

static int mtk_rtc_write_trigger(struct mt6397_rtc *rtc)
{
	unsigned long timeout = jiffies + HZ;
	int ret;
	u32 data;

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

	while (1) {
		ret = regmap_read(rtc->regmap, rtc->addr_base + RTC_BBPU,
				  &data);
		if (ret < 0)
			break;
		if (!(data & RTC_BBPU_CBUSY))
			break;
		if (time_after(jiffies, timeout)) {
			ret = -ETIMEDOUT;
			break;
		}
		cpu_relax();
	}

	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];
	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];

	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++;

	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);
	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;

	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	rtc->irq = irq_create_mapping(mt6397_chip->irq_domain, res->start);
	if (rtc->irq <= 0)
		return -EINVAL;

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

	platform_set_drvdata(pdev, rtc);

	ret = request_threaded_irq(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);
		goto out_dispose_irq;
	}

	device_init_wakeup(&pdev->dev, 1);

	rtc->rtc_dev = rtc_device_register("mt6397-rtc", &pdev->dev,
					   &mtk_rtc_ops, THIS_MODULE);
	if (IS_ERR(rtc->rtc_dev)) {
		dev_err(&pdev->dev, "register rtc device failed\n");
		ret = PTR_ERR(rtc->rtc_dev);
		goto out_free_irq;
	}

	return 0;

out_free_irq:
	free_irq(rtc->irq, rtc->rtc_dev);
out_dispose_irq:
	irq_dispose_mapping(rtc->irq);
	return ret;
}

static int mtk_rtc_remove(struct platform_device *pdev)
{
	struct mt6397_rtc *rtc = platform_get_drvdata(pdev);

	rtc_device_unregister(rtc->rtc_dev);
	free_irq(rtc->irq, rtc->rtc_dev);
	irq_dispose_mapping(rtc->irq);

	return 0;
}

#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 of_device_id mt6397_rtc_of_match[] = {
	{ .compatible = "mediatek,mt6397-rtc", },
	{ }
};
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,
	.remove = mtk_rtc_remove,
};

module_platform_driver(mtk_rtc_driver);

MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Tianping Fang <[email protected]>");
MODULE_DESCRIPTION("RTC Driver for MediaTek MT6397 PMIC");
Commit	Line	Data
fc297911 TF	1	/*
	2	* Copyright (c) 2014-2015 MediaTek Inc.
	3	* Author: Tianping.Fang <[email protected]>
	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License version 2 as
	7	* published by the Free Software Foundation.
	8	*
	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*/
	14
	15	#include <linux/delay.h>
	16	#include <linux/init.h>
	17	#include <linux/module.h>
	18	#include <linux/regmap.h>
	19	#include <linux/rtc.h>
	20	#include <linux/irqdomain.h>
	21	#include <linux/platform_device.h>
	22	#include <linux/of_address.h>
	23	#include <linux/of_irq.h>
	24	#include <linux/io.h>
	25	#include <linux/mfd/mt6397/core.h>
	26
	27	#define RTC_BBPU 0x0000
	28	#define RTC_BBPU_CBUSY BIT(6)
	29
	30	#define RTC_WRTGR 0x003c
	31
	32	#define RTC_IRQ_STA 0x0002
	33	#define RTC_IRQ_STA_AL BIT(0)
	34	#define RTC_IRQ_STA_LP BIT(3)
	35
	36	#define RTC_IRQ_EN 0x0004
	37	#define RTC_IRQ_EN_AL BIT(0)
	38	#define RTC_IRQ_EN_ONESHOT BIT(2)
	39	#define RTC_IRQ_EN_LP BIT(3)
	40	#define RTC_IRQ_EN_ONESHOT_AL (RTC_IRQ_EN_ONESHOT \| RTC_IRQ_EN_AL)
	41
	42	#define RTC_AL_MASK 0x0008
	43	#define RTC_AL_MASK_DOW BIT(4)
	44
	45	#define RTC_TC_SEC 0x000a
	46	/* Min, Hour, Dom... register offset to RTC_TC_SEC */
	47	#define RTC_OFFSET_SEC 0
	48	#define RTC_OFFSET_MIN 1
	49	#define RTC_OFFSET_HOUR 2
	50	#define RTC_OFFSET_DOM 3
	51	#define RTC_OFFSET_DOW 4
	52	#define RTC_OFFSET_MTH 5
	53	#define RTC_OFFSET_YEAR 6
	54	#define RTC_OFFSET_COUNT 7
	55
	56	#define RTC_AL_SEC 0x0018
	57
	58	#define RTC_PDN2 0x002e
	59	#define RTC_PDN2_PWRON_ALARM BIT(4)
	60
	61	#define RTC_MIN_YEAR 1968
	62	#define RTC_BASE_YEAR 1900
	63	#define RTC_NUM_YEARS 128
	64	#define RTC_MIN_YEAR_OFFSET (RTC_MIN_YEAR - RTC_BASE_YEAR)
65
66	struct mt6397_rtc {
67	struct device *dev;
68	struct rtc_device *rtc_dev;
69	struct mutex lock;
70	struct regmap *regmap;
71	int irq;
72	u32 addr_base;
73	};
74
75	static int mtk_rtc_write_trigger(struct mt6397_rtc *rtc)
76	{
77	unsigned long timeout = jiffies + HZ;
78	int ret;
79	u32 data;
80
81	ret = regmap_write(rtc->regmap, rtc->addr_base + RTC_WRTGR, 1);
82	if (ret < 0)
83	return ret;
84
85	while (1) {
86	ret = regmap_read(rtc->regmap, rtc->addr_base + RTC_BBPU,
87	&data);
88	if (ret < 0)
89	break;
90	if (!(data & RTC_BBPU_CBUSY))
91	break;
92	if (time_after(jiffies, timeout)) {
93	ret = -ETIMEDOUT;
94	break;
95	}
96	cpu_relax();
97	}
98
99	return ret;
100	}
101
102	static irqreturn_t mtk_rtc_irq_handler_thread(int irq, void *data)
103	{
104	struct mt6397_rtc *rtc = data;
105	u32 irqsta, irqen;
106	int ret;
107
108	ret = regmap_read(rtc->regmap, rtc->addr_base + RTC_IRQ_STA, &irqsta);
109	if ((ret >= 0) && (irqsta & RTC_IRQ_STA_AL)) {
110	rtc_update_irq(rtc->rtc_dev, 1, RTC_IRQF \| RTC_AF);
111	irqen = irqsta & ~RTC_IRQ_EN_AL;
112	mutex_lock(&rtc->lock);
113	if (regmap_write(rtc->regmap, rtc->addr_base + RTC_IRQ_EN,
114	irqen) < 0)
115	mtk_rtc_write_trigger(rtc);
116	mutex_unlock(&rtc->lock);
117
118	return IRQ_HANDLED;
119	}
120
121	return IRQ_NONE;
122	}
123
124	static int __mtk_rtc_read_time(struct mt6397_rtc *rtc,
125	struct rtc_time tm, int sec)
126	{
127	int ret;
128	u16 data[RTC_OFFSET_COUNT];
129
130	mutex_lock(&rtc->lock);
131	ret = regmap_bulk_read(rtc->regmap, rtc->addr_base + RTC_TC_SEC,
132	data, RTC_OFFSET_COUNT);
133	if (ret < 0)
134	goto exit;
135
136	tm->tm_sec = data[RTC_OFFSET_SEC];
137	tm->tm_min = data[RTC_OFFSET_MIN];
138	tm->tm_hour = data[RTC_OFFSET_HOUR];
139	tm->tm_mday = data[RTC_OFFSET_DOM];
140	tm->tm_mon = data[RTC_OFFSET_MTH];
141	tm->tm_year = data[RTC_OFFSET_YEAR];
142
143	ret = regmap_read(rtc->regmap, rtc->addr_base + RTC_TC_SEC, sec);
144	exit:
145	mutex_unlock(&rtc->lock);
146	return ret;
147	}
148
149	static int mtk_rtc_read_time(struct device dev, struct rtc_time tm)
150	{
151	time64_t time;
152	struct mt6397_rtc *rtc = dev_get_drvdata(dev);
93939967	153	int days, sec, ret;
fc297911 TF	154
	155	do {
	156	ret = __mtk_rtc_read_time(rtc, tm, &sec);
	157	if (ret < 0)
	158	goto exit;
	159	} while (sec < tm->tm_sec);
	160
	161	/* HW register use 7 bits to store year data, minus
	162	* RTC_MIN_YEAR_OFFSET before write year data to register, and plus
	163	* RTC_MIN_YEAR_OFFSET back after read year from register
	164	*/
	165	tm->tm_year += RTC_MIN_YEAR_OFFSET;
	166
	167	/* HW register start mon from one, but tm_mon start from zero. */
	168	tm->tm_mon--;
	169	time = rtc_tm_to_time64(tm);
	170
	171	/* rtc_tm_to_time64 covert Gregorian date to seconds since
	172	* 01-01-1970 00:00:00, and this date is Thursday.
	173	*/
93939967 AB	174	days = div_s64(time, 86400);
93939967 AB	175	tm->tm_wday = (days + 4) % 7;
fc297911 TF	176
	177	exit:
	178	return ret;
	179	}
	180
	181	static int mtk_rtc_set_time(struct device dev, struct rtc_time tm)
	182	{
	183	struct mt6397_rtc *rtc = dev_get_drvdata(dev);
	184	int ret;
	185	u16 data[RTC_OFFSET_COUNT];
	186
	187	tm->tm_year -= RTC_MIN_YEAR_OFFSET;
	188	tm->tm_mon++;
	189
	190	data[RTC_OFFSET_SEC] = tm->tm_sec;
	191	data[RTC_OFFSET_MIN] = tm->tm_min;
	192	data[RTC_OFFSET_HOUR] = tm->tm_hour;
	193	data[RTC_OFFSET_DOM] = tm->tm_mday;
	194	data[RTC_OFFSET_MTH] = tm->tm_mon;
	195	data[RTC_OFFSET_YEAR] = tm->tm_year;
	196
	197	mutex_lock(&rtc->lock);
	198	ret = regmap_bulk_write(rtc->regmap, rtc->addr_base + RTC_TC_SEC,
	199	data, RTC_OFFSET_COUNT);
	200	if (ret < 0)
	201	goto exit;
	202
	203	/* Time register write to hardware after call trigger function */
	204	ret = mtk_rtc_write_trigger(rtc);
	205
	206	exit:
	207	mutex_unlock(&rtc->lock);
	208	return ret;
	209	}
	210
	211	static int mtk_rtc_read_alarm(struct device dev, struct rtc_wkalrm alm)
	212	{
	213	struct rtc_time *tm = &alm->time;
	214	struct mt6397_rtc *rtc = dev_get_drvdata(dev);
	215	u32 irqen, pdn2;
	216	int ret;
	217	u16 data[RTC_OFFSET_COUNT];
	218
	219	mutex_lock(&rtc->lock);
	220	ret = regmap_read(rtc->regmap, rtc->addr_base + RTC_IRQ_EN, &irqen);
	221	if (ret < 0)
	222	goto err_exit;
	223	ret = regmap_read(rtc->regmap, rtc->addr_base + RTC_PDN2, &pdn2);
	224	if (ret < 0)
	225	goto err_exit;
	226
	227	ret = regmap_bulk_read(rtc->regmap, rtc->addr_base + RTC_AL_SEC,
	228	data, RTC_OFFSET_COUNT);
	229	if (ret < 0)
	230	goto err_exit;
	231
	232	alm->enabled = !!(irqen & RTC_IRQ_EN_AL);
	233	alm->pending = !!(pdn2 & RTC_PDN2_PWRON_ALARM);
	234	mutex_unlock(&rtc->lock);
	235
	236	tm->tm_sec = data[RTC_OFFSET_SEC];
	237	tm->tm_min = data[RTC_OFFSET_MIN];
	238	tm->tm_hour = data[RTC_OFFSET_HOUR];
	239	tm->tm_mday = data[RTC_OFFSET_DOM];
240	tm->tm_mon = data[RTC_OFFSET_MTH];
241	tm->tm_year = data[RTC_OFFSET_YEAR];
242
243	tm->tm_year += RTC_MIN_YEAR_OFFSET;
244	tm->tm_mon--;
245
246	return 0;
247	err_exit:
248	mutex_unlock(&rtc->lock);
249	return ret;
250	}
251
252	static int mtk_rtc_set_alarm(struct device dev, struct rtc_wkalrm alm)
253	{
254	struct rtc_time *tm = &alm->time;
255	struct mt6397_rtc *rtc = dev_get_drvdata(dev);
256	int ret;
257	u16 data[RTC_OFFSET_COUNT];
258
259	tm->tm_year -= RTC_MIN_YEAR_OFFSET;
260	tm->tm_mon++;
261
262	data[RTC_OFFSET_SEC] = tm->tm_sec;
263	data[RTC_OFFSET_MIN] = tm->tm_min;
264	data[RTC_OFFSET_HOUR] = tm->tm_hour;
265	data[RTC_OFFSET_DOM] = tm->tm_mday;
266	data[RTC_OFFSET_MTH] = tm->tm_mon;
267	data[RTC_OFFSET_YEAR] = tm->tm_year;
268
269	mutex_lock(&rtc->lock);
270	if (alm->enabled) {
271	ret = regmap_bulk_write(rtc->regmap,
272	rtc->addr_base + RTC_AL_SEC,
273	data, RTC_OFFSET_COUNT);
274	if (ret < 0)
275	goto exit;
276	ret = regmap_write(rtc->regmap, rtc->addr_base + RTC_AL_MASK,
277	RTC_AL_MASK_DOW);
278	if (ret < 0)
279	goto exit;
280	ret = regmap_update_bits(rtc->regmap,
281	rtc->addr_base + RTC_IRQ_EN,
282	RTC_IRQ_EN_ONESHOT_AL,
283	RTC_IRQ_EN_ONESHOT_AL);
284	if (ret < 0)
285	goto exit;
286	} else {
287	ret = regmap_update_bits(rtc->regmap,
288	rtc->addr_base + RTC_IRQ_EN,
289	RTC_IRQ_EN_ONESHOT_AL, 0);
290	if (ret < 0)
291	goto exit;
292	}
293
294	/* All alarm time register write to hardware after calling
295	* mtk_rtc_write_trigger. This can avoid race condition if alarm
296	* occur happen during writing alarm time register.
297	*/
298	ret = mtk_rtc_write_trigger(rtc);
299	exit:
300	mutex_unlock(&rtc->lock);
301	return ret;
302	}
303
34c7b3ac	304	static const struct rtc_class_ops mtk_rtc_ops = {
fc297911 TF	305	.read_time = mtk_rtc_read_time,
	306	.set_time = mtk_rtc_set_time,
	307	.read_alarm = mtk_rtc_read_alarm,
	308	.set_alarm = mtk_rtc_set_alarm,
	309	};
	310
	311	static int mtk_rtc_probe(struct platform_device *pdev)
	312	{
	313	struct resource *res;
	314	struct mt6397_chip *mt6397_chip = dev_get_drvdata(pdev->dev.parent);
	315	struct mt6397_rtc *rtc;
	316	int ret;
	317
	318	rtc = devm_kzalloc(&pdev->dev, sizeof(struct mt6397_rtc), GFP_KERNEL);
	319	if (!rtc)
	320	return -ENOMEM;
	321
	322	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	323	rtc->addr_base = res->start;
	324
	325	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	326	rtc->irq = irq_create_mapping(mt6397_chip->irq_domain, res->start);
	327	if (rtc->irq <= 0)
	328	return -EINVAL;
	329
	330	rtc->regmap = mt6397_chip->regmap;
	331	rtc->dev = &pdev->dev;
	332	mutex_init(&rtc->lock);
	333
	334	platform_set_drvdata(pdev, rtc);
	335
	336	ret = request_threaded_irq(rtc->irq, NULL,
	337	mtk_rtc_irq_handler_thread,
	338	IRQF_ONESHOT \| IRQF_TRIGGER_HIGH,
	339	"mt6397-rtc", rtc);
	340	if (ret) {
	341	dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n",
	342	rtc->irq, ret);
	343	goto out_dispose_irq;
	344	}
	345
baeca449 WNH	346	device_init_wakeup(&pdev->dev, 1);
baeca449 WNH	347
fc297911 TF	348	rtc->rtc_dev = rtc_device_register("mt6397-rtc", &pdev->dev,
	349	&mtk_rtc_ops, THIS_MODULE);
	350	if (IS_ERR(rtc->rtc_dev)) {
	351	dev_err(&pdev->dev, "register rtc device failed\n");
	352	ret = PTR_ERR(rtc->rtc_dev);
	353	goto out_free_irq;
	354	}
	355
fc297911 TF	356	return 0;
	357
	358	out_free_irq:
	359	free_irq(rtc->irq, rtc->rtc_dev);
	360	out_dispose_irq:
	361	irq_dispose_mapping(rtc->irq);
	362	return ret;
	363	}
	364
	365	static int mtk_rtc_remove(struct platform_device *pdev)
	366	{
	367	struct mt6397_rtc *rtc = platform_get_drvdata(pdev);
	368
	369	rtc_device_unregister(rtc->rtc_dev);
	370	free_irq(rtc->irq, rtc->rtc_dev);
	371	irq_dispose_mapping(rtc->irq);
	372
	373	return 0;
	374	}
	375
d7f9777d HC	376	#ifdef CONFIG_PM_SLEEP
	377	static int mt6397_rtc_suspend(struct device *dev)
	378	{
	379	struct mt6397_rtc *rtc = dev_get_drvdata(dev);
	380
	381	if (device_may_wakeup(dev))
	382	enable_irq_wake(rtc->irq);
	383
	384	return 0;
	385	}
	386
	387	static int mt6397_rtc_resume(struct device *dev)
	388	{
	389	struct mt6397_rtc *rtc = dev_get_drvdata(dev);
	390
	391	if (device_may_wakeup(dev))
	392	disable_irq_wake(rtc->irq);
	393
	394	return 0;
	395	}
	396	#endif
	397
	398	static SIMPLE_DEV_PM_OPS(mt6397_pm_ops, mt6397_rtc_suspend,
	399	mt6397_rtc_resume);
	400
fc297911 TF	401	static const struct of_device_id mt6397_rtc_of_match[] = {
	402	{ .compatible = "mediatek,mt6397-rtc", },
	403	{ }
	404	};
73798d5c	405	MODULE_DEVICE_TABLE(of, mt6397_rtc_of_match);
fc297911 TF	406
	407	static struct platform_driver mtk_rtc_driver = {
	408	.driver = {
	409	.name = "mt6397-rtc",
	410	.of_match_table = mt6397_rtc_of_match,
d7f9777d	411	.pm = &mt6397_pm_ops,
fc297911 TF	412	},
	413	.probe = mtk_rtc_probe,
	414	.remove = mtk_rtc_remove,
	415	};
	416
	417	module_platform_driver(mtk_rtc_driver);
	418
	419	MODULE_LICENSE("GPL v2");
	420	MODULE_AUTHOR("Tianping Fang <[email protected]>");
	421	MODULE_DESCRIPTION("RTC Driver for MediaTek MT6397 PMIC");