[linux-2.6-block.git] / drivers / rtc / rtc-snvs.c

// SPDX-License-Identifier: GPL-2.0+
//
// Copyright (C) 2011-2012 Freescale Semiconductor, Inc.

#include <linux/init.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/rtc.h>
#include <linux/clk.h>
#include <linux/mfd/syscon.h>
#include <linux/regmap.h>

#define SNVS_LPREGISTER_OFFSET	0x34

/* These register offsets are relative to LP (Low Power) range */
#define SNVS_LPCR		0x04
#define SNVS_LPSR		0x18
#define SNVS_LPSRTCMR		0x1c
#define SNVS_LPSRTCLR		0x20
#define SNVS_LPTAR		0x24
#define SNVS_LPPGDR		0x30

#define SNVS_LPCR_SRTC_ENV	(1 << 0)
#define SNVS_LPCR_LPTA_EN	(1 << 1)
#define SNVS_LPCR_LPWUI_EN	(1 << 3)
#define SNVS_LPSR_LPTA		(1 << 0)

#define SNVS_LPPGDR_INIT	0x41736166
#define CNTR_TO_SECS_SH		15

struct snvs_rtc_data {
	struct rtc_device *rtc;
	struct regmap *regmap;
	int offset;
	int irq;
	struct clk *clk;
};

static u32 rtc_read_lp_counter(struct snvs_rtc_data *data)
{
	u64 read1, read2;
	u32 val;

	do {
		regmap_read(data->regmap, data->offset + SNVS_LPSRTCMR, &val);
		read1 = val;
		read1 <<= 32;
		regmap_read(data->regmap, data->offset + SNVS_LPSRTCLR, &val);
		read1 |= val;

		regmap_read(data->regmap, data->offset + SNVS_LPSRTCMR, &val);
		read2 = val;
		read2 <<= 32;
		regmap_read(data->regmap, data->offset + SNVS_LPSRTCLR, &val);
		read2 |= val;
	} while (read1 != read2);

	/* Convert 47-bit counter to 32-bit raw second count */
	return (u32) (read1 >> CNTR_TO_SECS_SH);
}

static void rtc_write_sync_lp(struct snvs_rtc_data *data)
{
	u32 count1, count2, count3;
	int i;

	/* Wait for 3 CKIL cycles */
	for (i = 0; i < 3; i++) {
		do {
			regmap_read(data->regmap, data->offset + SNVS_LPSRTCLR, &count1);
			regmap_read(data->regmap, data->offset + SNVS_LPSRTCLR, &count2);
		} while (count1 != count2);

		/* Now wait until counter value changes */
		do {
			do {
				regmap_read(data->regmap, data->offset + SNVS_LPSRTCLR, &count2);
				regmap_read(data->regmap, data->offset + SNVS_LPSRTCLR, &count3);
			} while (count2 != count3);
		} while (count3 == count1);
	}
}

static int snvs_rtc_enable(struct snvs_rtc_data *data, bool enable)
{
	int timeout = 1000;
	u32 lpcr;

	regmap_update_bits(data->regmap, data->offset + SNVS_LPCR, SNVS_LPCR_SRTC_ENV,
			   enable ? SNVS_LPCR_SRTC_ENV : 0);

	while (--timeout) {
		regmap_read(data->regmap, data->offset + SNVS_LPCR, &lpcr);

		if (enable) {
			if (lpcr & SNVS_LPCR_SRTC_ENV)
				break;
		} else {
			if (!(lpcr & SNVS_LPCR_SRTC_ENV))
				break;
		}
	}

	if (!timeout)
		return -ETIMEDOUT;

	return 0;
}

static int snvs_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
	struct snvs_rtc_data *data = dev_get_drvdata(dev);
	unsigned long time = rtc_read_lp_counter(data);

	rtc_time_to_tm(time, tm);

	return 0;
}

static int snvs_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
	struct snvs_rtc_data *data = dev_get_drvdata(dev);
	unsigned long time;
	int ret;

	rtc_tm_to_time(tm, &time);

	/* Disable RTC first */
	ret = snvs_rtc_enable(data, false);
	if (ret)
		return ret;

	/* Write 32-bit time to 47-bit timer, leaving 15 LSBs blank */
	regmap_write(data->regmap, data->offset + SNVS_LPSRTCLR, time << CNTR_TO_SECS_SH);
	regmap_write(data->regmap, data->offset + SNVS_LPSRTCMR, time >> (32 - CNTR_TO_SECS_SH));

	/* Enable RTC again */
	ret = snvs_rtc_enable(data, true);

	return ret;
}

static int snvs_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	struct snvs_rtc_data *data = dev_get_drvdata(dev);
	u32 lptar, lpsr;

	regmap_read(data->regmap, data->offset + SNVS_LPTAR, &lptar);
	rtc_time_to_tm(lptar, &alrm->time);

	regmap_read(data->regmap, data->offset + SNVS_LPSR, &lpsr);
	alrm->pending = (lpsr & SNVS_LPSR_LPTA) ? 1 : 0;

	return 0;
}

static int snvs_rtc_alarm_irq_enable(struct device *dev, unsigned int enable)
{
	struct snvs_rtc_data *data = dev_get_drvdata(dev);

	regmap_update_bits(data->regmap, data->offset + SNVS_LPCR,
			   (SNVS_LPCR_LPTA_EN | SNVS_LPCR_LPWUI_EN),
			   enable ? (SNVS_LPCR_LPTA_EN | SNVS_LPCR_LPWUI_EN) : 0);

	rtc_write_sync_lp(data);

	return 0;
}

static int snvs_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	struct snvs_rtc_data *data = dev_get_drvdata(dev);
	struct rtc_time *alrm_tm = &alrm->time;
	unsigned long time;

	rtc_tm_to_time(alrm_tm, &time);

	regmap_update_bits(data->regmap, data->offset + SNVS_LPCR, SNVS_LPCR_LPTA_EN, 0);
	rtc_write_sync_lp(data);
	regmap_write(data->regmap, data->offset + SNVS_LPTAR, time);

	/* Clear alarm interrupt status bit */
	regmap_write(data->regmap, data->offset + SNVS_LPSR, SNVS_LPSR_LPTA);

	return snvs_rtc_alarm_irq_enable(dev, alrm->enabled);
}

static const struct rtc_class_ops snvs_rtc_ops = {
	.read_time = snvs_rtc_read_time,
	.set_time = snvs_rtc_set_time,
	.read_alarm = snvs_rtc_read_alarm,
	.set_alarm = snvs_rtc_set_alarm,
	.alarm_irq_enable = snvs_rtc_alarm_irq_enable,
};

static irqreturn_t snvs_rtc_irq_handler(int irq, void *dev_id)
{
	struct device *dev = dev_id;
	struct snvs_rtc_data *data = dev_get_drvdata(dev);
	u32 lpsr;
	u32 events = 0;

	regmap_read(data->regmap, data->offset + SNVS_LPSR, &lpsr);

	if (lpsr & SNVS_LPSR_LPTA) {
		events |= (RTC_AF | RTC_IRQF);

		/* RTC alarm should be one-shot */
		snvs_rtc_alarm_irq_enable(dev, 0);

		rtc_update_irq(data->rtc, 1, events);
	}

	/* clear interrupt status */
	regmap_write(data->regmap, data->offset + SNVS_LPSR, lpsr);

	return events ? IRQ_HANDLED : IRQ_NONE;
}

static const struct regmap_config snvs_rtc_config = {
	.reg_bits = 32,
	.val_bits = 32,
	.reg_stride = 4,
};

static int snvs_rtc_probe(struct platform_device *pdev)
{
	struct snvs_rtc_data *data;
	struct resource *res;
	int ret;
	void __iomem *mmio;

	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	data->regmap = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "regmap");

	if (IS_ERR(data->regmap)) {
		dev_warn(&pdev->dev, "snvs rtc: you use old dts file, please update it\n");
		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

		mmio = devm_ioremap_resource(&pdev->dev, res);
		if (IS_ERR(mmio))
			return PTR_ERR(mmio);

		data->regmap = devm_regmap_init_mmio(&pdev->dev, mmio, &snvs_rtc_config);
	} else {
		data->offset = SNVS_LPREGISTER_OFFSET;
		of_property_read_u32(pdev->dev.of_node, "offset", &data->offset);
	}

	if (IS_ERR(data->regmap)) {
		dev_err(&pdev->dev, "Can't find snvs syscon\n");
		return -ENODEV;
	}

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

	data->clk = devm_clk_get(&pdev->dev, "snvs-rtc");
	if (IS_ERR(data->clk)) {
		data->clk = NULL;
	} else {
		ret = clk_prepare_enable(data->clk);
		if (ret) {
			dev_err(&pdev->dev,
				"Could not prepare or enable the snvs clock\n");
			return ret;
		}
	}

	platform_set_drvdata(pdev, data);

	/* Initialize glitch detect */
	regmap_write(data->regmap, data->offset + SNVS_LPPGDR, SNVS_LPPGDR_INIT);

	/* Clear interrupt status */
	regmap_write(data->regmap, data->offset + SNVS_LPSR, 0xffffffff);

	/* Enable RTC */
	ret = snvs_rtc_enable(data, true);
	if (ret) {
		dev_err(&pdev->dev, "failed to enable rtc %d\n", ret);
		goto error_rtc_device_register;
	}

	device_init_wakeup(&pdev->dev, true);

	ret = devm_request_irq(&pdev->dev, data->irq, snvs_rtc_irq_handler,
			       IRQF_SHARED, "rtc alarm", &pdev->dev);
	if (ret) {
		dev_err(&pdev->dev, "failed to request irq %d: %d\n",
			data->irq, ret);
		goto error_rtc_device_register;
	}

	data->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
					&snvs_rtc_ops, THIS_MODULE);
	if (IS_ERR(data->rtc)) {
		ret = PTR_ERR(data->rtc);
		dev_err(&pdev->dev, "failed to register rtc: %d\n", ret);
		goto error_rtc_device_register;
	}

	return 0;

error_rtc_device_register:
	if (data->clk)
		clk_disable_unprepare(data->clk);

	return ret;
}

#ifdef CONFIG_PM_SLEEP
static int snvs_rtc_suspend(struct device *dev)
{
	struct snvs_rtc_data *data = dev_get_drvdata(dev);

	if (device_may_wakeup(dev))
		return enable_irq_wake(data->irq);

	return 0;
}

static int snvs_rtc_suspend_noirq(struct device *dev)
{
	struct snvs_rtc_data *data = dev_get_drvdata(dev);

	if (data->clk)
		clk_disable_unprepare(data->clk);

	return 0;
}

static int snvs_rtc_resume(struct device *dev)
{
	struct snvs_rtc_data *data = dev_get_drvdata(dev);

	if (device_may_wakeup(dev))
		return disable_irq_wake(data->irq);

	return 0;
}

static int snvs_rtc_resume_noirq(struct device *dev)
{
	struct snvs_rtc_data *data = dev_get_drvdata(dev);

	if (data->clk)
		return clk_prepare_enable(data->clk);

	return 0;
}

static const struct dev_pm_ops snvs_rtc_pm_ops = {
	.suspend = snvs_rtc_suspend,
	.suspend_noirq = snvs_rtc_suspend_noirq,
	.resume = snvs_rtc_resume,
	.resume_noirq = snvs_rtc_resume_noirq,
};

#define SNVS_RTC_PM_OPS	(&snvs_rtc_pm_ops)

#else

#define SNVS_RTC_PM_OPS	NULL

#endif

static const struct of_device_id snvs_dt_ids[] = {
	{ .compatible = "fsl,sec-v4.0-mon-rtc-lp", },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, snvs_dt_ids);

static struct platform_driver snvs_rtc_driver = {
	.driver = {
		.name	= "snvs_rtc",
		.pm	= SNVS_RTC_PM_OPS,
		.of_match_table = snvs_dt_ids,
	},
	.probe		= snvs_rtc_probe,
};
module_platform_driver(snvs_rtc_driver);

MODULE_AUTHOR("Freescale Semiconductor, Inc.");
MODULE_DESCRIPTION("Freescale SNVS RTC Driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
5874c7f1 FE	1	// SPDX-License-Identifier: GPL-2.0+
	2	//
	3	// Copyright (C) 2011-2012 Freescale Semiconductor, Inc.
179a502f SG	4
	5	#include <linux/init.h>
	6	#include <linux/io.h>
	7	#include <linux/kernel.h>
	8	#include <linux/module.h>
	9	#include <linux/of.h>
	10	#include <linux/of_device.h>
	11	#include <linux/platform_device.h>
	12	#include <linux/rtc.h>
7f899399	13	#include <linux/clk.h>
d482893b FL	14	#include <linux/mfd/syscon.h>
	15	#include <linux/regmap.h>
	16
	17	#define SNVS_LPREGISTER_OFFSET 0x34
179a502f SG	18
	19	/* These register offsets are relative to LP (Low Power) range */
	20	#define SNVS_LPCR 0x04
	21	#define SNVS_LPSR 0x18
	22	#define SNVS_LPSRTCMR 0x1c
	23	#define SNVS_LPSRTCLR 0x20
	24	#define SNVS_LPTAR 0x24
	25	#define SNVS_LPPGDR 0x30
	26
	27	#define SNVS_LPCR_SRTC_ENV (1 << 0)
	28	#define SNVS_LPCR_LPTA_EN (1 << 1)
	29	#define SNVS_LPCR_LPWUI_EN (1 << 3)
	30	#define SNVS_LPSR_LPTA (1 << 0)
	31
	32	#define SNVS_LPPGDR_INIT 0x41736166
	33	#define CNTR_TO_SECS_SH 15
	34
	35	struct snvs_rtc_data {
	36	struct rtc_device *rtc;
d482893b FL	37	struct regmap *regmap;
d482893b FL	38	int offset;
179a502f	39	int irq;
7f899399	40	struct clk *clk;
179a502f SG	41	};
179a502f SG	42
d482893b	43	static u32 rtc_read_lp_counter(struct snvs_rtc_data *data)
179a502f SG	44	{
179a502f SG	45	u64 read1, read2;
d482893b	46	u32 val;
179a502f SG	47
179a502f SG	48	do {
d482893b FL	49	regmap_read(data->regmap, data->offset + SNVS_LPSRTCMR, &val);
d482893b FL	50	read1 = val;
179a502f	51	read1 <<= 32;
d482893b FL	52	regmap_read(data->regmap, data->offset + SNVS_LPSRTCLR, &val);
d482893b FL	53	read1 \|= val;
179a502f	54
d482893b FL	55	regmap_read(data->regmap, data->offset + SNVS_LPSRTCMR, &val);
d482893b FL	56	read2 = val;
179a502f	57	read2 <<= 32;
d482893b FL	58	regmap_read(data->regmap, data->offset + SNVS_LPSRTCLR, &val);
d482893b FL	59	read2 \|= val;
179a502f SG	60	} while (read1 != read2);
	61
	62	/* Convert 47-bit counter to 32-bit raw second count */
	63	return (u32) (read1 >> CNTR_TO_SECS_SH);
	64	}
	65
d482893b	66	static void rtc_write_sync_lp(struct snvs_rtc_data *data)
179a502f SG	67	{
	68	u32 count1, count2, count3;
	69	int i;
	70
	71	/* Wait for 3 CKIL cycles */
	72	for (i = 0; i < 3; i++) {
	73	do {
d482893b FL	74	regmap_read(data->regmap, data->offset + SNVS_LPSRTCLR, &count1);
d482893b FL	75	regmap_read(data->regmap, data->offset + SNVS_LPSRTCLR, &count2);
179a502f SG	76	} while (count1 != count2);
	77
	78	/* Now wait until counter value changes */
	79	do {
	80	do {
d482893b FL	81	regmap_read(data->regmap, data->offset + SNVS_LPSRTCLR, &count2);
d482893b FL	82	regmap_read(data->regmap, data->offset + SNVS_LPSRTCLR, &count3);
179a502f SG	83	} while (count2 != count3);
	84	} while (count3 == count1);
	85	}
	86	}
	87
	88	static int snvs_rtc_enable(struct snvs_rtc_data *data, bool enable)
	89	{
179a502f SG	90	int timeout = 1000;
	91	u32 lpcr;
	92
d482893b FL	93	regmap_update_bits(data->regmap, data->offset + SNVS_LPCR, SNVS_LPCR_SRTC_ENV,
d482893b FL	94	enable ? SNVS_LPCR_SRTC_ENV : 0);
179a502f SG	95
179a502f SG	96	while (--timeout) {
d482893b	97	regmap_read(data->regmap, data->offset + SNVS_LPCR, &lpcr);
179a502f SG	98
	99	if (enable) {
	100	if (lpcr & SNVS_LPCR_SRTC_ENV)
	101	break;
	102	} else {
	103	if (!(lpcr & SNVS_LPCR_SRTC_ENV))
	104	break;
	105	}
	106	}
	107
	108	if (!timeout)
	109	return -ETIMEDOUT;
	110
	111	return 0;
	112	}
	113
	114	static int snvs_rtc_read_time(struct device dev, struct rtc_time tm)
	115	{
	116	struct snvs_rtc_data *data = dev_get_drvdata(dev);
d482893b	117	unsigned long time = rtc_read_lp_counter(data);
179a502f SG	118
	119	rtc_time_to_tm(time, tm);
	120
	121	return 0;
	122	}
	123
	124	static int snvs_rtc_set_time(struct device dev, struct rtc_time tm)
	125	{
	126	struct snvs_rtc_data *data = dev_get_drvdata(dev);
	127	unsigned long time;
1485991c	128	int ret;
179a502f SG	129
	130	rtc_tm_to_time(tm, &time);
	131
	132	/* Disable RTC first */
1485991c BD	133	ret = snvs_rtc_enable(data, false);
	134	if (ret)
	135	return ret;
179a502f SG	136
179a502f SG	137	/* Write 32-bit time to 47-bit timer, leaving 15 LSBs blank */
d482893b FL	138	regmap_write(data->regmap, data->offset + SNVS_LPSRTCLR, time << CNTR_TO_SECS_SH);
d482893b FL	139	regmap_write(data->regmap, data->offset + SNVS_LPSRTCMR, time >> (32 - CNTR_TO_SECS_SH));
179a502f SG	140
179a502f SG	141	/* Enable RTC again */
1485991c	142	ret = snvs_rtc_enable(data, true);
179a502f	143
1485991c	144	return ret;
179a502f SG	145	}
	146
	147	static int snvs_rtc_read_alarm(struct device dev, struct rtc_wkalrm alrm)
	148	{
	149	struct snvs_rtc_data *data = dev_get_drvdata(dev);
	150	u32 lptar, lpsr;
	151
d482893b	152	regmap_read(data->regmap, data->offset + SNVS_LPTAR, &lptar);
179a502f SG	153	rtc_time_to_tm(lptar, &alrm->time);
179a502f SG	154
d482893b	155	regmap_read(data->regmap, data->offset + SNVS_LPSR, &lpsr);
179a502f SG	156	alrm->pending = (lpsr & SNVS_LPSR_LPTA) ? 1 : 0;
	157
	158	return 0;
	159	}
	160
	161	static int snvs_rtc_alarm_irq_enable(struct device *dev, unsigned int enable)
	162	{
	163	struct snvs_rtc_data *data = dev_get_drvdata(dev);
179a502f	164
d482893b FL	165	regmap_update_bits(data->regmap, data->offset + SNVS_LPCR,
	166	(SNVS_LPCR_LPTA_EN \| SNVS_LPCR_LPWUI_EN),
	167	enable ? (SNVS_LPCR_LPTA_EN \| SNVS_LPCR_LPWUI_EN) : 0);
179a502f	168
d482893b	169	rtc_write_sync_lp(data);
179a502f SG	170
	171	return 0;
	172	}
	173
	174	static int snvs_rtc_set_alarm(struct device dev, struct rtc_wkalrm alrm)
	175	{
	176	struct snvs_rtc_data *data = dev_get_drvdata(dev);
	177	struct rtc_time *alrm_tm = &alrm->time;
	178	unsigned long time;
179a502f SG	179
	180	rtc_tm_to_time(alrm_tm, &time);
	181
d482893b	182	regmap_update_bits(data->regmap, data->offset + SNVS_LPCR, SNVS_LPCR_LPTA_EN, 0);
7bb633b1	183	rtc_write_sync_lp(data);
d482893b	184	regmap_write(data->regmap, data->offset + SNVS_LPTAR, time);
179a502f SG	185
179a502f SG	186	/* Clear alarm interrupt status bit */
d482893b	187	regmap_write(data->regmap, data->offset + SNVS_LPSR, SNVS_LPSR_LPTA);
179a502f SG	188
	189	return snvs_rtc_alarm_irq_enable(dev, alrm->enabled);
	190	}
	191
	192	static const struct rtc_class_ops snvs_rtc_ops = {
	193	.read_time = snvs_rtc_read_time,
	194	.set_time = snvs_rtc_set_time,
	195	.read_alarm = snvs_rtc_read_alarm,
	196	.set_alarm = snvs_rtc_set_alarm,
	197	.alarm_irq_enable = snvs_rtc_alarm_irq_enable,
	198	};
	199
	200	static irqreturn_t snvs_rtc_irq_handler(int irq, void *dev_id)
	201	{
	202	struct device *dev = dev_id;
	203	struct snvs_rtc_data *data = dev_get_drvdata(dev);
	204	u32 lpsr;
	205	u32 events = 0;
	206
d482893b	207	regmap_read(data->regmap, data->offset + SNVS_LPSR, &lpsr);
179a502f SG	208
	209	if (lpsr & SNVS_LPSR_LPTA) {
	210	events \|= (RTC_AF \| RTC_IRQF);
	211
	212	/* RTC alarm should be one-shot */
	213	snvs_rtc_alarm_irq_enable(dev, 0);
	214
	215	rtc_update_irq(data->rtc, 1, events);
	216	}
	217
	218	/* clear interrupt status */
d482893b	219	regmap_write(data->regmap, data->offset + SNVS_LPSR, lpsr);
179a502f SG	220
	221	return events ? IRQ_HANDLED : IRQ_NONE;
	222	}
	223
d482893b FL	224	static const struct regmap_config snvs_rtc_config = {
	225	.reg_bits = 32,
	226	.val_bits = 32,
	227	.reg_stride = 4,
	228	};
	229
5a167f45	230	static int snvs_rtc_probe(struct platform_device *pdev)
179a502f SG	231	{
	232	struct snvs_rtc_data *data;
	233	struct resource *res;
	234	int ret;
d482893b	235	void __iomem *mmio;
179a502f SG	236
	237	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
	238	if (!data)
	239	return -ENOMEM;
	240
d482893b FL	241	data->regmap = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "regmap");
	242
	243	if (IS_ERR(data->regmap)) {
	244	dev_warn(&pdev->dev, "snvs rtc: you use old dts file, please update it\n");
	245	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	246
	247	mmio = devm_ioremap_resource(&pdev->dev, res);
	248	if (IS_ERR(mmio))
	249	return PTR_ERR(mmio);
	250
	251	data->regmap = devm_regmap_init_mmio(&pdev->dev, mmio, &snvs_rtc_config);
	252	} else {
	253	data->offset = SNVS_LPREGISTER_OFFSET;
	254	of_property_read_u32(pdev->dev.of_node, "offset", &data->offset);
	255	}
	256
75892900	257	if (IS_ERR(data->regmap)) {
d482893b FL	258	dev_err(&pdev->dev, "Can't find snvs syscon\n");
	259	return -ENODEV;
	260	}
179a502f SG	261
	262	data->irq = platform_get_irq(pdev, 0);
	263	if (data->irq < 0)
	264	return data->irq;
	265
7f899399 SM	266	data->clk = devm_clk_get(&pdev->dev, "snvs-rtc");
	267	if (IS_ERR(data->clk)) {
	268	data->clk = NULL;
	269	} else {
	270	ret = clk_prepare_enable(data->clk);
	271	if (ret) {
	272	dev_err(&pdev->dev,
	273	"Could not prepare or enable the snvs clock\n");
	274	return ret;
	275	}
	276	}
	277
179a502f SG	278	platform_set_drvdata(pdev, data);
179a502f SG	279
179a502f	280	/* Initialize glitch detect */
d482893b	281	regmap_write(data->regmap, data->offset + SNVS_LPPGDR, SNVS_LPPGDR_INIT);
179a502f SG	282
179a502f SG	283	/* Clear interrupt status */
d482893b	284	regmap_write(data->regmap, data->offset + SNVS_LPSR, 0xffffffff);
179a502f SG	285
179a502f SG	286	/* Enable RTC */
1485991c BD	287	ret = snvs_rtc_enable(data, true);
	288	if (ret) {
	289	dev_err(&pdev->dev, "failed to enable rtc %d\n", ret);
	290	goto error_rtc_device_register;
	291	}
179a502f SG	292
	293	device_init_wakeup(&pdev->dev, true);
	294
	295	ret = devm_request_irq(&pdev->dev, data->irq, snvs_rtc_irq_handler,
	296	IRQF_SHARED, "rtc alarm", &pdev->dev);
	297	if (ret) {
	298	dev_err(&pdev->dev, "failed to request irq %d: %d\n",
	299	data->irq, ret);
7f899399	300	goto error_rtc_device_register;
179a502f SG	301	}
179a502f SG	302
904784c1	303	data->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
179a502f SG	304	&snvs_rtc_ops, THIS_MODULE);
	305	if (IS_ERR(data->rtc)) {
	306	ret = PTR_ERR(data->rtc);
	307	dev_err(&pdev->dev, "failed to register rtc: %d\n", ret);
7f899399	308	goto error_rtc_device_register;
179a502f SG	309	}
	310
	311	return 0;
7f899399 SM	312
	313	error_rtc_device_register:
	314	if (data->clk)
	315	clk_disable_unprepare(data->clk);
	316
	317	return ret;
179a502f SG	318	}
179a502f SG	319
179a502f SG	320	#ifdef CONFIG_PM_SLEEP
	321	static int snvs_rtc_suspend(struct device *dev)
	322	{
	323	struct snvs_rtc_data *data = dev_get_drvdata(dev);
	324
	325	if (device_may_wakeup(dev))
a350259d	326	return enable_irq_wake(data->irq);
179a502f	327
119434f4 SA	328	return 0;
	329	}
	330
	331	static int snvs_rtc_suspend_noirq(struct device *dev)
	332	{
	333	struct snvs_rtc_data *data = dev_get_drvdata(dev);
	334
7f899399 SM	335	if (data->clk)
	336	clk_disable_unprepare(data->clk);
	337
179a502f SG	338	return 0;
	339	}
	340
	341	static int snvs_rtc_resume(struct device *dev)
	342	{
	343	struct snvs_rtc_data *data = dev_get_drvdata(dev);
	344
	345	if (device_may_wakeup(dev))
119434f4	346	return disable_irq_wake(data->irq);
179a502f	347
119434f4 SA	348	return 0;
	349	}
	350
	351	static int snvs_rtc_resume_noirq(struct device *dev)
	352	{
	353	struct snvs_rtc_data *data = dev_get_drvdata(dev);
	354
	355	if (data->clk)
	356	return clk_prepare_enable(data->clk);
7f899399	357
179a502f SG	358	return 0;
179a502f SG	359	}
179a502f	360
7654e9d4	361	static const struct dev_pm_ops snvs_rtc_pm_ops = {
119434f4 SA	362	.suspend = snvs_rtc_suspend,
	363	.suspend_noirq = snvs_rtc_suspend_noirq,
	364	.resume = snvs_rtc_resume,
	365	.resume_noirq = snvs_rtc_resume_noirq,
7654e9d4	366	};
179a502f	367
88221c32 GR	368	#define SNVS_RTC_PM_OPS (&snvs_rtc_pm_ops)
	369
	370	#else
	371
	372	#define SNVS_RTC_PM_OPS NULL
	373
	374	#endif
	375
5a167f45	376	static const struct of_device_id snvs_dt_ids[] = {
179a502f SG	377	{ .compatible = "fsl,sec-v4.0-mon-rtc-lp", },
	378	{ /* sentinel */ }
	379	};
	380	MODULE_DEVICE_TABLE(of, snvs_dt_ids);
	381
	382	static struct platform_driver snvs_rtc_driver = {
	383	.driver = {
	384	.name = "snvs_rtc",
88221c32	385	.pm = SNVS_RTC_PM_OPS,
c39b3717	386	.of_match_table = snvs_dt_ids,
179a502f SG	387	},
179a502f SG	388	.probe = snvs_rtc_probe,
179a502f SG	389	};
	390	module_platform_driver(snvs_rtc_driver);
	391
	392	MODULE_AUTHOR("Freescale Semiconductor, Inc.");
	393	MODULE_DESCRIPTION("Freescale SNVS RTC Driver");
	394	MODULE_LICENSE("GPL");