[mirror_ubuntu-bionic-kernel.git] / drivers / rtc / rtc-snvs.c

/*
 * Copyright (C) 2011-2012 Freescale Semiconductor, Inc.
 *
 * The code contained herein is licensed under the GNU General Public
 * License. You may obtain a copy of the GNU General Public License
 * Version 2 or later at the following locations:
 *
 * http://www.opensource.org/licenses/gpl-license.html
 * http://www.gnu.org/copyleft/gpl.html
 */

#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
179a502f SG	1	/*
	2	* Copyright (C) 2011-2012 Freescale Semiconductor, Inc.
	3	*
	4	* The code contained herein is licensed under the GNU General Public
	5	* License. You may obtain a copy of the GNU General Public License
	6	* Version 2 or later at the following locations:
	7	*
	8	* http://www.opensource.org/licenses/gpl-license.html
	9	* http://www.gnu.org/copyleft/gpl.html
	10	*/
	11
	12	#include <linux/init.h>
	13	#include <linux/io.h>
	14	#include <linux/kernel.h>
	15	#include <linux/module.h>
	16	#include <linux/of.h>
	17	#include <linux/of_device.h>
	18	#include <linux/platform_device.h>
	19	#include <linux/rtc.h>
7f899399	20	#include <linux/clk.h>
d482893b FL	21	#include <linux/mfd/syscon.h>
	22	#include <linux/regmap.h>
	23
	24	#define SNVS_LPREGISTER_OFFSET 0x34
179a502f SG	25
	26	/* These register offsets are relative to LP (Low Power) range */
	27	#define SNVS_LPCR 0x04
	28	#define SNVS_LPSR 0x18
	29	#define SNVS_LPSRTCMR 0x1c
	30	#define SNVS_LPSRTCLR 0x20
	31	#define SNVS_LPTAR 0x24
	32	#define SNVS_LPPGDR 0x30
	33
	34	#define SNVS_LPCR_SRTC_ENV (1 << 0)
	35	#define SNVS_LPCR_LPTA_EN (1 << 1)
	36	#define SNVS_LPCR_LPWUI_EN (1 << 3)
	37	#define SNVS_LPSR_LPTA (1 << 0)
	38
	39	#define SNVS_LPPGDR_INIT 0x41736166
	40	#define CNTR_TO_SECS_SH 15
	41
	42	struct snvs_rtc_data {
	43	struct rtc_device *rtc;
d482893b FL	44	struct regmap *regmap;
d482893b FL	45	int offset;
179a502f	46	int irq;
7f899399	47	struct clk *clk;
179a502f SG	48	};
179a502f SG	49
d482893b	50	static u32 rtc_read_lp_counter(struct snvs_rtc_data *data)
179a502f SG	51	{
179a502f SG	52	u64 read1, read2;
d482893b	53	u32 val;
179a502f SG	54
179a502f SG	55	do {
d482893b FL	56	regmap_read(data->regmap, data->offset + SNVS_LPSRTCMR, &val);
d482893b FL	57	read1 = val;
179a502f	58	read1 <<= 32;
d482893b FL	59	regmap_read(data->regmap, data->offset + SNVS_LPSRTCLR, &val);
d482893b FL	60	read1 \|= val;
179a502f	61
d482893b FL	62	regmap_read(data->regmap, data->offset + SNVS_LPSRTCMR, &val);
d482893b FL	63	read2 = val;
179a502f	64	read2 <<= 32;
d482893b FL	65	regmap_read(data->regmap, data->offset + SNVS_LPSRTCLR, &val);
d482893b FL	66	read2 \|= val;
179a502f SG	67	} while (read1 != read2);
	68
	69	/* Convert 47-bit counter to 32-bit raw second count */
	70	return (u32) (read1 >> CNTR_TO_SECS_SH);
	71	}
	72
d482893b	73	static void rtc_write_sync_lp(struct snvs_rtc_data *data)
179a502f SG	74	{
	75	u32 count1, count2, count3;
	76	int i;
	77
	78	/* Wait for 3 CKIL cycles */
	79	for (i = 0; i < 3; i++) {
	80	do {
d482893b FL	81	regmap_read(data->regmap, data->offset + SNVS_LPSRTCLR, &count1);
d482893b FL	82	regmap_read(data->regmap, data->offset + SNVS_LPSRTCLR, &count2);
179a502f SG	83	} while (count1 != count2);
	84
	85	/* Now wait until counter value changes */
	86	do {
	87	do {
d482893b FL	88	regmap_read(data->regmap, data->offset + SNVS_LPSRTCLR, &count2);
d482893b FL	89	regmap_read(data->regmap, data->offset + SNVS_LPSRTCLR, &count3);
179a502f SG	90	} while (count2 != count3);
	91	} while (count3 == count1);
	92	}
	93	}
	94
	95	static int snvs_rtc_enable(struct snvs_rtc_data *data, bool enable)
	96	{
179a502f SG	97	int timeout = 1000;
	98	u32 lpcr;
	99
d482893b FL	100	regmap_update_bits(data->regmap, data->offset + SNVS_LPCR, SNVS_LPCR_SRTC_ENV,
d482893b FL	101	enable ? SNVS_LPCR_SRTC_ENV : 0);
179a502f SG	102
179a502f SG	103	while (--timeout) {
d482893b	104	regmap_read(data->regmap, data->offset + SNVS_LPCR, &lpcr);
179a502f SG	105
	106	if (enable) {
	107	if (lpcr & SNVS_LPCR_SRTC_ENV)
	108	break;
	109	} else {
	110	if (!(lpcr & SNVS_LPCR_SRTC_ENV))
	111	break;
	112	}
	113	}
	114
	115	if (!timeout)
	116	return -ETIMEDOUT;
	117
	118	return 0;
	119	}
	120
	121	static int snvs_rtc_read_time(struct device dev, struct rtc_time tm)
	122	{
	123	struct snvs_rtc_data *data = dev_get_drvdata(dev);
d482893b	124	unsigned long time = rtc_read_lp_counter(data);
179a502f SG	125
	126	rtc_time_to_tm(time, tm);
	127
	128	return 0;
	129	}
	130
	131	static int snvs_rtc_set_time(struct device dev, struct rtc_time tm)
	132	{
	133	struct snvs_rtc_data *data = dev_get_drvdata(dev);
	134	unsigned long time;
3f129bd8	135	int ret;
179a502f SG	136
	137	rtc_tm_to_time(tm, &time);
	138
	139	/* Disable RTC first */
3f129bd8 BD	140	ret = snvs_rtc_enable(data, false);
	141	if (ret)
	142	return ret;
179a502f SG	143
179a502f SG	144	/* Write 32-bit time to 47-bit timer, leaving 15 LSBs blank */
d482893b FL	145	regmap_write(data->regmap, data->offset + SNVS_LPSRTCLR, time << CNTR_TO_SECS_SH);
d482893b FL	146	regmap_write(data->regmap, data->offset + SNVS_LPSRTCMR, time >> (32 - CNTR_TO_SECS_SH));
179a502f SG	147
179a502f SG	148	/* Enable RTC again */
3f129bd8	149	ret = snvs_rtc_enable(data, true);
179a502f	150
3f129bd8	151	return ret;
179a502f SG	152	}
	153
	154	static int snvs_rtc_read_alarm(struct device dev, struct rtc_wkalrm alrm)
	155	{
	156	struct snvs_rtc_data *data = dev_get_drvdata(dev);
	157	u32 lptar, lpsr;
	158
d482893b	159	regmap_read(data->regmap, data->offset + SNVS_LPTAR, &lptar);
179a502f SG	160	rtc_time_to_tm(lptar, &alrm->time);
179a502f SG	161
d482893b	162	regmap_read(data->regmap, data->offset + SNVS_LPSR, &lpsr);
179a502f SG	163	alrm->pending = (lpsr & SNVS_LPSR_LPTA) ? 1 : 0;
	164
	165	return 0;
	166	}
	167
	168	static int snvs_rtc_alarm_irq_enable(struct device *dev, unsigned int enable)
	169	{
	170	struct snvs_rtc_data *data = dev_get_drvdata(dev);
179a502f	171
d482893b FL	172	regmap_update_bits(data->regmap, data->offset + SNVS_LPCR,
	173	(SNVS_LPCR_LPTA_EN \| SNVS_LPCR_LPWUI_EN),
	174	enable ? (SNVS_LPCR_LPTA_EN \| SNVS_LPCR_LPWUI_EN) : 0);
179a502f	175
d482893b	176	rtc_write_sync_lp(data);
179a502f SG	177
	178	return 0;
	179	}
	180
	181	static int snvs_rtc_set_alarm(struct device dev, struct rtc_wkalrm alrm)
	182	{
	183	struct snvs_rtc_data *data = dev_get_drvdata(dev);
	184	struct rtc_time *alrm_tm = &alrm->time;
	185	unsigned long time;
179a502f SG	186
	187	rtc_tm_to_time(alrm_tm, &time);
	188
d482893b	189	regmap_update_bits(data->regmap, data->offset + SNVS_LPCR, SNVS_LPCR_LPTA_EN, 0);
7bb633b1	190	rtc_write_sync_lp(data);
d482893b	191	regmap_write(data->regmap, data->offset + SNVS_LPTAR, time);
179a502f SG	192
179a502f SG	193	/* Clear alarm interrupt status bit */
d482893b	194	regmap_write(data->regmap, data->offset + SNVS_LPSR, SNVS_LPSR_LPTA);
179a502f SG	195
	196	return snvs_rtc_alarm_irq_enable(dev, alrm->enabled);
	197	}
	198
	199	static const struct rtc_class_ops snvs_rtc_ops = {
	200	.read_time = snvs_rtc_read_time,
	201	.set_time = snvs_rtc_set_time,
	202	.read_alarm = snvs_rtc_read_alarm,
	203	.set_alarm = snvs_rtc_set_alarm,
	204	.alarm_irq_enable = snvs_rtc_alarm_irq_enable,
	205	};
	206
	207	static irqreturn_t snvs_rtc_irq_handler(int irq, void *dev_id)
	208	{
	209	struct device *dev = dev_id;
	210	struct snvs_rtc_data *data = dev_get_drvdata(dev);
	211	u32 lpsr;
	212	u32 events = 0;
	213
d482893b	214	regmap_read(data->regmap, data->offset + SNVS_LPSR, &lpsr);
179a502f SG	215
	216	if (lpsr & SNVS_LPSR_LPTA) {
	217	events \|= (RTC_AF \| RTC_IRQF);
	218
	219	/* RTC alarm should be one-shot */
	220	snvs_rtc_alarm_irq_enable(dev, 0);
	221
	222	rtc_update_irq(data->rtc, 1, events);
	223	}
	224
	225	/* clear interrupt status */
d482893b	226	regmap_write(data->regmap, data->offset + SNVS_LPSR, lpsr);
179a502f SG	227
	228	return events ? IRQ_HANDLED : IRQ_NONE;
	229	}
	230
d482893b FL	231	static const struct regmap_config snvs_rtc_config = {
	232	.reg_bits = 32,
	233	.val_bits = 32,
	234	.reg_stride = 4,
	235	};
	236
5a167f45	237	static int snvs_rtc_probe(struct platform_device *pdev)
179a502f SG	238	{
	239	struct snvs_rtc_data *data;
	240	struct resource *res;
	241	int ret;
d482893b	242	void __iomem *mmio;
179a502f SG	243
	244	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
	245	if (!data)
	246	return -ENOMEM;
	247
d482893b FL	248	data->regmap = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "regmap");
	249
	250	if (IS_ERR(data->regmap)) {
	251	dev_warn(&pdev->dev, "snvs rtc: you use old dts file, please update it\n");
	252	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	253
	254	mmio = devm_ioremap_resource(&pdev->dev, res);
	255	if (IS_ERR(mmio))
	256	return PTR_ERR(mmio);
	257
	258	data->regmap = devm_regmap_init_mmio(&pdev->dev, mmio, &snvs_rtc_config);
	259	} else {
	260	data->offset = SNVS_LPREGISTER_OFFSET;
	261	of_property_read_u32(pdev->dev.of_node, "offset", &data->offset);
	262	}
	263
75892900	264	if (IS_ERR(data->regmap)) {
d482893b FL	265	dev_err(&pdev->dev, "Can't find snvs syscon\n");
	266	return -ENODEV;
	267	}
179a502f SG	268
	269	data->irq = platform_get_irq(pdev, 0);
	270	if (data->irq < 0)
	271	return data->irq;
	272
7f899399 SM	273	data->clk = devm_clk_get(&pdev->dev, "snvs-rtc");
	274	if (IS_ERR(data->clk)) {
	275	data->clk = NULL;
	276	} else {
	277	ret = clk_prepare_enable(data->clk);
	278	if (ret) {
	279	dev_err(&pdev->dev,
	280	"Could not prepare or enable the snvs clock\n");
	281	return ret;
	282	}
	283	}
	284
179a502f SG	285	platform_set_drvdata(pdev, data);
179a502f SG	286
179a502f	287	/* Initialize glitch detect */
d482893b	288	regmap_write(data->regmap, data->offset + SNVS_LPPGDR, SNVS_LPPGDR_INIT);
179a502f SG	289
179a502f SG	290	/* Clear interrupt status */
d482893b	291	regmap_write(data->regmap, data->offset + SNVS_LPSR, 0xffffffff);
179a502f SG	292
179a502f SG	293	/* Enable RTC */
3f129bd8 BD	294	ret = snvs_rtc_enable(data, true);
	295	if (ret) {
	296	dev_err(&pdev->dev, "failed to enable rtc %d\n", ret);
	297	goto error_rtc_device_register;
	298	}
179a502f SG	299
	300	device_init_wakeup(&pdev->dev, true);
	301
	302	ret = devm_request_irq(&pdev->dev, data->irq, snvs_rtc_irq_handler,
	303	IRQF_SHARED, "rtc alarm", &pdev->dev);
	304	if (ret) {
	305	dev_err(&pdev->dev, "failed to request irq %d: %d\n",
	306	data->irq, ret);
7f899399	307	goto error_rtc_device_register;
179a502f SG	308	}
179a502f SG	309
904784c1	310	data->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
179a502f SG	311	&snvs_rtc_ops, THIS_MODULE);
	312	if (IS_ERR(data->rtc)) {
	313	ret = PTR_ERR(data->rtc);
	314	dev_err(&pdev->dev, "failed to register rtc: %d\n", ret);
7f899399	315	goto error_rtc_device_register;
179a502f SG	316	}
	317
	318	return 0;
7f899399 SM	319
	320	error_rtc_device_register:
	321	if (data->clk)
	322	clk_disable_unprepare(data->clk);
	323
	324	return ret;
179a502f SG	325	}
179a502f SG	326
179a502f SG	327	#ifdef CONFIG_PM_SLEEP
	328	static int snvs_rtc_suspend(struct device *dev)
	329	{
	330	struct snvs_rtc_data *data = dev_get_drvdata(dev);
	331
	332	if (device_may_wakeup(dev))
a350259d	333	return enable_irq_wake(data->irq);
179a502f	334
119434f4 SA	335	return 0;
	336	}
	337
	338	static int snvs_rtc_suspend_noirq(struct device *dev)
	339	{
	340	struct snvs_rtc_data *data = dev_get_drvdata(dev);
	341
7f899399 SM	342	if (data->clk)
	343	clk_disable_unprepare(data->clk);
	344
179a502f SG	345	return 0;
	346	}
	347
	348	static int snvs_rtc_resume(struct device *dev)
	349	{
	350	struct snvs_rtc_data *data = dev_get_drvdata(dev);
	351
	352	if (device_may_wakeup(dev))
119434f4	353	return disable_irq_wake(data->irq);
179a502f	354
119434f4 SA	355	return 0;
	356	}
	357
	358	static int snvs_rtc_resume_noirq(struct device *dev)
	359	{
	360	struct snvs_rtc_data *data = dev_get_drvdata(dev);
	361
	362	if (data->clk)
	363	return clk_prepare_enable(data->clk);
7f899399	364
179a502f SG	365	return 0;
179a502f SG	366	}
179a502f	367
7654e9d4	368	static const struct dev_pm_ops snvs_rtc_pm_ops = {
119434f4 SA	369	.suspend = snvs_rtc_suspend,
	370	.suspend_noirq = snvs_rtc_suspend_noirq,
	371	.resume = snvs_rtc_resume,
	372	.resume_noirq = snvs_rtc_resume_noirq,
7654e9d4	373	};
179a502f	374
88221c32 GR	375	#define SNVS_RTC_PM_OPS (&snvs_rtc_pm_ops)
	376
	377	#else
	378
	379	#define SNVS_RTC_PM_OPS NULL
	380
	381	#endif
	382
5a167f45	383	static const struct of_device_id snvs_dt_ids[] = {
179a502f SG	384	{ .compatible = "fsl,sec-v4.0-mon-rtc-lp", },
	385	{ /* sentinel */ }
	386	};
	387	MODULE_DEVICE_TABLE(of, snvs_dt_ids);
	388
	389	static struct platform_driver snvs_rtc_driver = {
	390	.driver = {
	391	.name = "snvs_rtc",
88221c32	392	.pm = SNVS_RTC_PM_OPS,
c39b3717	393	.of_match_table = snvs_dt_ids,
179a502f SG	394	},
179a502f SG	395	.probe = snvs_rtc_probe,
179a502f SG	396	};
	397	module_platform_driver(snvs_rtc_driver);
	398
	399	MODULE_AUTHOR("Freescale Semiconductor, Inc.");
	400	MODULE_DESCRIPTION("Freescale SNVS RTC Driver");
	401	MODULE_LICENSE("GPL");