drivers/rtc/rtc-mv.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * Driver for the RTC in Marvell SoCs.
  */

 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/rtc.h>
 #include <linux/bcd.h>
 #include <linux/bitops.h>
 #include <linux/io.h>
 #include <linux/platform_device.h>
 #include <linux/of.h>
 #include <linux/delay.h>
 #include <linux/clk.h>
 #include <linux/gfp.h>
 #include <linux/module.h>


 #define RTC_TIME_REG_OFFS	0
 #define RTC_SECONDS_OFFS	0
 #define RTC_MINUTES_OFFS	8
 #define RTC_HOURS_OFFS		16
 #define RTC_WDAY_OFFS		24
 #define RTC_HOURS_12H_MODE	BIT(22) /* 12 hour mode */

 #define RTC_DATE_REG_OFFS	4
 #define RTC_MDAY_OFFS		0
 #define RTC_MONTH_OFFS		8
 #define RTC_YEAR_OFFS		16

 #define RTC_ALARM_TIME_REG_OFFS	8
 #define RTC_ALARM_DATE_REG_OFFS	0xc
 #define RTC_ALARM_VALID		BIT(7)

 #define RTC_ALARM_INTERRUPT_MASK_REG_OFFS	0x10
 #define RTC_ALARM_INTERRUPT_CASUE_REG_OFFS	0x14

 struct rtc_plat_data {
 	struct rtc_device *rtc;
 	void __iomem *ioaddr;
 	int		irq;
 	struct clk	*clk;
 };

 static int mv_rtc_set_time(struct device *dev, struct rtc_time *tm)
 {
 	struct rtc_plat_data *pdata = dev_get_drvdata(dev);
 	void __iomem *ioaddr = pdata->ioaddr;
 	u32	rtc_reg;

 	rtc_reg = (bin2bcd(tm->tm_sec) << RTC_SECONDS_OFFS) |
 		(bin2bcd(tm->tm_min) << RTC_MINUTES_OFFS) |
 		(bin2bcd(tm->tm_hour) << RTC_HOURS_OFFS) |
 		(bin2bcd(tm->tm_wday) << RTC_WDAY_OFFS);
 	writel(rtc_reg, ioaddr + RTC_TIME_REG_OFFS);

 	rtc_reg = (bin2bcd(tm->tm_mday) << RTC_MDAY_OFFS) |
 		(bin2bcd(tm->tm_mon + 1) << RTC_MONTH_OFFS) |
 		(bin2bcd(tm->tm_year - 100) << RTC_YEAR_OFFS);
 	writel(rtc_reg, ioaddr + RTC_DATE_REG_OFFS);

 	return 0;
 }

 static int mv_rtc_read_time(struct device *dev, struct rtc_time *tm)
 {
 	struct rtc_plat_data *pdata = dev_get_drvdata(dev);
 	void __iomem *ioaddr = pdata->ioaddr;
 	u32	rtc_time, rtc_date;
 	unsigned int year, month, day, hour, minute, second, wday;

 	rtc_time = readl(ioaddr + RTC_TIME_REG_OFFS);
 	rtc_date = readl(ioaddr + RTC_DATE_REG_OFFS);

 	second = rtc_time & 0x7f;
 	minute = (rtc_time >> RTC_MINUTES_OFFS) & 0x7f;
 	hour = (rtc_time >> RTC_HOURS_OFFS) & 0x3f; /* assume 24 hour mode */
 	wday = (rtc_time >> RTC_WDAY_OFFS) & 0x7;

 	day = rtc_date & 0x3f;
 	month = (rtc_date >> RTC_MONTH_OFFS) & 0x3f;
 	year = (rtc_date >> RTC_YEAR_OFFS) & 0xff;

 	tm->tm_sec = bcd2bin(second);
 	tm->tm_min = bcd2bin(minute);
 	tm->tm_hour = bcd2bin(hour);
 	tm->tm_mday = bcd2bin(day);
 	tm->tm_wday = bcd2bin(wday);
 	tm->tm_mon = bcd2bin(month) - 1;
 	/* hw counts from year 2000, but tm_year is relative to 1900 */
 	tm->tm_year = bcd2bin(year) + 100;

 	return 0;
 }

 static int mv_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
 {
 	struct rtc_plat_data *pdata = dev_get_drvdata(dev);
 	void __iomem *ioaddr = pdata->ioaddr;
 	u32	rtc_time, rtc_date;
 	unsigned int year, month, day, hour, minute, second, wday;

 	rtc_time = readl(ioaddr + RTC_ALARM_TIME_REG_OFFS);
 	rtc_date = readl(ioaddr + RTC_ALARM_DATE_REG_OFFS);

 	second = rtc_time & 0x7f;
 	minute = (rtc_time >> RTC_MINUTES_OFFS) & 0x7f;
 	hour = (rtc_time >> RTC_HOURS_OFFS) & 0x3f; /* assume 24 hour mode */
 	wday = (rtc_time >> RTC_WDAY_OFFS) & 0x7;

 	day = rtc_date & 0x3f;
 	month = (rtc_date >> RTC_MONTH_OFFS) & 0x3f;
 	year = (rtc_date >> RTC_YEAR_OFFS) & 0xff;

 	alm->time.tm_sec = bcd2bin(second);
 	alm->time.tm_min = bcd2bin(minute);
 	alm->time.tm_hour = bcd2bin(hour);
 	alm->time.tm_mday = bcd2bin(day);
 	alm->time.tm_wday = bcd2bin(wday);
 	alm->time.tm_mon = bcd2bin(month) - 1;
 	/* hw counts from year 2000, but tm_year is relative to 1900 */
 	alm->time.tm_year = bcd2bin(year) + 100;

 	alm->enabled = !!readl(ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);

 	return rtc_valid_tm(&alm->time);
 }

 static int mv_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
 {
 	struct rtc_plat_data *pdata = dev_get_drvdata(dev);
 	void __iomem *ioaddr = pdata->ioaddr;
 	u32 rtc_reg = 0;

 	if (alm->time.tm_sec >= 0)
 		rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_sec))
 			<< RTC_SECONDS_OFFS;
 	if (alm->time.tm_min >= 0)
 		rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_min))
 			<< RTC_MINUTES_OFFS;
 	if (alm->time.tm_hour >= 0)
 		rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_hour))
 			<< RTC_HOURS_OFFS;

 	writel(rtc_reg, ioaddr + RTC_ALARM_TIME_REG_OFFS);

 	if (alm->time.tm_mday >= 0)
 		rtc_reg = (RTC_ALARM_VALID | bin2bcd(alm->time.tm_mday))
 			<< RTC_MDAY_OFFS;
 	else
 		rtc_reg = 0;

 	if (alm->time.tm_mon >= 0)
 		rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_mon + 1))
 			<< RTC_MONTH_OFFS;

 	if (alm->time.tm_year >= 0)
 		rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_year - 100))
 			<< RTC_YEAR_OFFS;

 	writel(rtc_reg, ioaddr + RTC_ALARM_DATE_REG_OFFS);
 	writel(0, ioaddr + RTC_ALARM_INTERRUPT_CASUE_REG_OFFS);
 	writel(alm->enabled ? 1 : 0,
 	       ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);

 	return 0;
 }

 static int mv_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
 {
 	struct rtc_plat_data *pdata = dev_get_drvdata(dev);
 	void __iomem *ioaddr = pdata->ioaddr;

 	if (pdata->irq < 0)
 		return -EINVAL; /* fall back into rtc-dev's emulation */

 	if (enabled)
 		writel(1, ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
 	else
 		writel(0, ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
 	return 0;
 }

 static irqreturn_t mv_rtc_interrupt(int irq, void *data)
 {
 	struct rtc_plat_data *pdata = data;
 	void __iomem *ioaddr = pdata->ioaddr;

 	/* alarm irq? */
 	if (!readl(ioaddr + RTC_ALARM_INTERRUPT_CASUE_REG_OFFS))
 		return IRQ_NONE;

 	/* clear interrupt */
 	writel(0, ioaddr + RTC_ALARM_INTERRUPT_CASUE_REG_OFFS);
 	rtc_update_irq(pdata->rtc, 1, RTC_IRQF | RTC_AF);
 	return IRQ_HANDLED;
 }

 static const struct rtc_class_ops mv_rtc_ops = {
 	.read_time	= mv_rtc_read_time,
 	.set_time	= mv_rtc_set_time,
 };

 static const struct rtc_class_ops mv_rtc_alarm_ops = {
 	.read_time	= mv_rtc_read_time,
 	.set_time	= mv_rtc_set_time,
 	.read_alarm	= mv_rtc_read_alarm,
 	.set_alarm	= mv_rtc_set_alarm,
 	.alarm_irq_enable = mv_rtc_alarm_irq_enable,
 };

 static int __init mv_rtc_probe(struct platform_device *pdev)
 {
 	struct rtc_plat_data *pdata;
 	u32 rtc_time;
 	int ret = 0;

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

 	pdata->ioaddr = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(pdata->ioaddr))
 		return PTR_ERR(pdata->ioaddr);

 	pdata->clk = devm_clk_get(&pdev->dev, NULL);
 	/* Not all SoCs require a clock.*/
 	if (!IS_ERR(pdata->clk))
 		clk_prepare_enable(pdata->clk);

 	/* make sure the 24 hour mode is enabled */
 	rtc_time = readl(pdata->ioaddr + RTC_TIME_REG_OFFS);
 	if (rtc_time & RTC_HOURS_12H_MODE) {
 		dev_err(&pdev->dev, "12 Hour mode is enabled but not supported.\n");
 		ret = -EINVAL;
 		goto out;
 	}

 	/* make sure it is actually functional */
 	if (rtc_time == 0x01000000) {
 		ssleep(1);
 		rtc_time = readl(pdata->ioaddr + RTC_TIME_REG_OFFS);
 		if (rtc_time == 0x01000000) {
 			dev_err(&pdev->dev, "internal RTC not ticking\n");
 			ret = -ENODEV;
 			goto out;
 		}
 	}

 	pdata->irq = platform_get_irq(pdev, 0);

 	platform_set_drvdata(pdev, pdata);

 	pdata->rtc = devm_rtc_allocate_device(&pdev->dev);
 	if (IS_ERR(pdata->rtc)) {
 		ret = PTR_ERR(pdata->rtc);
 		goto out;
 	}

 	if (pdata->irq >= 0) {
 		writel(0, pdata->ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
 		if (devm_request_irq(&pdev->dev, pdata->irq, mv_rtc_interrupt,
 				     IRQF_SHARED,
 				     pdev->name, pdata) < 0) {
 			dev_warn(&pdev->dev, "interrupt not available.\n");
 			pdata->irq = -1;
 		}
 	}

 	if (pdata->irq >= 0) {
 		device_init_wakeup(&pdev->dev, 1);
 		pdata->rtc->ops = &mv_rtc_alarm_ops;
 	} else {
 		pdata->rtc->ops = &mv_rtc_ops;
 	}

 	pdata->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
 	pdata->rtc->range_max = RTC_TIMESTAMP_END_2099;

 	ret = rtc_register_device(pdata->rtc);
 	if (!ret)
 		return 0;
 out:
 	if (!IS_ERR(pdata->clk))
 		clk_disable_unprepare(pdata->clk);

 	return ret;
 }

 static int __exit mv_rtc_remove(struct platform_device *pdev)
 {
 	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);

 	if (pdata->irq >= 0)
 		device_init_wakeup(&pdev->dev, 0);

 	if (!IS_ERR(pdata->clk))
 		clk_disable_unprepare(pdata->clk);

 	return 0;
 }

 #ifdef CONFIG_OF
 static const struct of_device_id rtc_mv_of_match_table[] = {
 	{ .compatible = "marvell,orion-rtc", },
 	{}
 };
 MODULE_DEVICE_TABLE(of, rtc_mv_of_match_table);
 #endif

 static struct platform_driver mv_rtc_driver = {
 	.remove		= __exit_p(mv_rtc_remove),
 	.driver		= {
 		.name	= "rtc-mv",
 		.of_match_table = of_match_ptr(rtc_mv_of_match_table),
 	},
 };

 module_platform_driver_probe(mv_rtc_driver, mv_rtc_probe);

 MODULE_AUTHOR("Saeed Bishara <saeed@marvell.com>");
 MODULE_DESCRIPTION("Marvell RTC driver");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:rtc-mv");
	// SPDX-License-Identifier: GPL-2.0
	/*
	* Driver for the RTC in Marvell SoCs.
	*/

	#include <linux/init.h>
	#include <linux/kernel.h>
	#include <linux/rtc.h>
	#include <linux/bcd.h>
	#include <linux/bitops.h>
	#include <linux/io.h>
	#include <linux/platform_device.h>
	#include <linux/of.h>
	#include <linux/delay.h>
	#include <linux/clk.h>
	#include <linux/gfp.h>
	#include <linux/module.h>


	#define RTC_TIME_REG_OFFS 0
	#define RTC_SECONDS_OFFS 0
	#define RTC_MINUTES_OFFS 8
	#define RTC_HOURS_OFFS 16
	#define RTC_WDAY_OFFS 24
	#define RTC_HOURS_12H_MODE BIT(22) /* 12 hour mode */

	#define RTC_DATE_REG_OFFS 4
	#define RTC_MDAY_OFFS 0
	#define RTC_MONTH_OFFS 8
	#define RTC_YEAR_OFFS 16

	#define RTC_ALARM_TIME_REG_OFFS 8
	#define RTC_ALARM_DATE_REG_OFFS 0xc
	#define RTC_ALARM_VALID BIT(7)

	#define RTC_ALARM_INTERRUPT_MASK_REG_OFFS 0x10
	#define RTC_ALARM_INTERRUPT_CASUE_REG_OFFS 0x14

	struct rtc_plat_data {
	struct rtc_device *rtc;
	void __iomem *ioaddr;
	int irq;
	struct clk *clk;
	};

	static int mv_rtc_set_time(struct device dev, struct rtc_time tm)
	{
	struct rtc_plat_data *pdata = dev_get_drvdata(dev);
	void __iomem *ioaddr = pdata->ioaddr;
	u32 rtc_reg;

	rtc_reg = (bin2bcd(tm->tm_sec) << RTC_SECONDS_OFFS) \|
	(bin2bcd(tm->tm_min) << RTC_MINUTES_OFFS) \|
	(bin2bcd(tm->tm_hour) << RTC_HOURS_OFFS) \|
	(bin2bcd(tm->tm_wday) << RTC_WDAY_OFFS);
	writel(rtc_reg, ioaddr + RTC_TIME_REG_OFFS);

	rtc_reg = (bin2bcd(tm->tm_mday) << RTC_MDAY_OFFS) \|
	(bin2bcd(tm->tm_mon + 1) << RTC_MONTH_OFFS) \|
	(bin2bcd(tm->tm_year - 100) << RTC_YEAR_OFFS);
	writel(rtc_reg, ioaddr + RTC_DATE_REG_OFFS);

	return 0;
	}

	static int mv_rtc_read_time(struct device dev, struct rtc_time tm)
	{
	struct rtc_plat_data *pdata = dev_get_drvdata(dev);
	void __iomem *ioaddr = pdata->ioaddr;
	u32 rtc_time, rtc_date;
	unsigned int year, month, day, hour, minute, second, wday;

	rtc_time = readl(ioaddr + RTC_TIME_REG_OFFS);
	rtc_date = readl(ioaddr + RTC_DATE_REG_OFFS);

	second = rtc_time & 0x7f;
	minute = (rtc_time >> RTC_MINUTES_OFFS) & 0x7f;
	hour = (rtc_time >> RTC_HOURS_OFFS) & 0x3f; /* assume 24 hour mode */
	wday = (rtc_time >> RTC_WDAY_OFFS) & 0x7;

	day = rtc_date & 0x3f;
	month = (rtc_date >> RTC_MONTH_OFFS) & 0x3f;
	year = (rtc_date >> RTC_YEAR_OFFS) & 0xff;

	tm->tm_sec = bcd2bin(second);
	tm->tm_min = bcd2bin(minute);
	tm->tm_hour = bcd2bin(hour);
	tm->tm_mday = bcd2bin(day);
	tm->tm_wday = bcd2bin(wday);
	tm->tm_mon = bcd2bin(month) - 1;
	/* hw counts from year 2000, but tm_year is relative to 1900 */
	tm->tm_year = bcd2bin(year) + 100;

	return 0;
	}

	static int mv_rtc_read_alarm(struct device dev, struct rtc_wkalrm alm)
	{
	struct rtc_plat_data *pdata = dev_get_drvdata(dev);
	void __iomem *ioaddr = pdata->ioaddr;
	u32 rtc_time, rtc_date;
	unsigned int year, month, day, hour, minute, second, wday;

	rtc_time = readl(ioaddr + RTC_ALARM_TIME_REG_OFFS);
	rtc_date = readl(ioaddr + RTC_ALARM_DATE_REG_OFFS);

	second = rtc_time & 0x7f;
	minute = (rtc_time >> RTC_MINUTES_OFFS) & 0x7f;
	hour = (rtc_time >> RTC_HOURS_OFFS) & 0x3f; /* assume 24 hour mode */
	wday = (rtc_time >> RTC_WDAY_OFFS) & 0x7;

	day = rtc_date & 0x3f;
	month = (rtc_date >> RTC_MONTH_OFFS) & 0x3f;
	year = (rtc_date >> RTC_YEAR_OFFS) & 0xff;

	alm->time.tm_sec = bcd2bin(second);
	alm->time.tm_min = bcd2bin(minute);
	alm->time.tm_hour = bcd2bin(hour);
	alm->time.tm_mday = bcd2bin(day);
	alm->time.tm_wday = bcd2bin(wday);
	alm->time.tm_mon = bcd2bin(month) - 1;
	/* hw counts from year 2000, but tm_year is relative to 1900 */
	alm->time.tm_year = bcd2bin(year) + 100;

	alm->enabled = !!readl(ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);

	return rtc_valid_tm(&alm->time);
	}

	static int mv_rtc_set_alarm(struct device dev, struct rtc_wkalrm alm)
	{
	struct rtc_plat_data *pdata = dev_get_drvdata(dev);
	void __iomem *ioaddr = pdata->ioaddr;
	u32 rtc_reg = 0;

	if (alm->time.tm_sec >= 0)
	rtc_reg \|= (RTC_ALARM_VALID \| bin2bcd(alm->time.tm_sec))
	<< RTC_SECONDS_OFFS;
	if (alm->time.tm_min >= 0)
	rtc_reg \|= (RTC_ALARM_VALID \| bin2bcd(alm->time.tm_min))
	<< RTC_MINUTES_OFFS;
	if (alm->time.tm_hour >= 0)
	rtc_reg \|= (RTC_ALARM_VALID \| bin2bcd(alm->time.tm_hour))
	<< RTC_HOURS_OFFS;

	writel(rtc_reg, ioaddr + RTC_ALARM_TIME_REG_OFFS);

	if (alm->time.tm_mday >= 0)
	rtc_reg = (RTC_ALARM_VALID \| bin2bcd(alm->time.tm_mday))
	<< RTC_MDAY_OFFS;
	else
	rtc_reg = 0;

	if (alm->time.tm_mon >= 0)
	rtc_reg \|= (RTC_ALARM_VALID \| bin2bcd(alm->time.tm_mon + 1))
	<< RTC_MONTH_OFFS;

	if (alm->time.tm_year >= 0)
	rtc_reg \|= (RTC_ALARM_VALID \| bin2bcd(alm->time.tm_year - 100))
	<< RTC_YEAR_OFFS;

	writel(rtc_reg, ioaddr + RTC_ALARM_DATE_REG_OFFS);
	writel(0, ioaddr + RTC_ALARM_INTERRUPT_CASUE_REG_OFFS);
	writel(alm->enabled ? 1 : 0,
	ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);

	return 0;
	}

	static int mv_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
	{
	struct rtc_plat_data *pdata = dev_get_drvdata(dev);
	void __iomem *ioaddr = pdata->ioaddr;

	if (pdata->irq < 0)
	return -EINVAL; /* fall back into rtc-dev's emulation */

	if (enabled)
	writel(1, ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
	else
	writel(0, ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
	return 0;
	}

	static irqreturn_t mv_rtc_interrupt(int irq, void *data)
	{
	struct rtc_plat_data *pdata = data;
	void __iomem *ioaddr = pdata->ioaddr;

	/* alarm irq? */
	if (!readl(ioaddr + RTC_ALARM_INTERRUPT_CASUE_REG_OFFS))
	return IRQ_NONE;

	/* clear interrupt */
	writel(0, ioaddr + RTC_ALARM_INTERRUPT_CASUE_REG_OFFS);
	rtc_update_irq(pdata->rtc, 1, RTC_IRQF \| RTC_AF);
	return IRQ_HANDLED;
	}

	static const struct rtc_class_ops mv_rtc_ops = {
	.read_time = mv_rtc_read_time,
	.set_time = mv_rtc_set_time,
	};

	static const struct rtc_class_ops mv_rtc_alarm_ops = {
	.read_time = mv_rtc_read_time,
	.set_time = mv_rtc_set_time,
	.read_alarm = mv_rtc_read_alarm,
	.set_alarm = mv_rtc_set_alarm,
	.alarm_irq_enable = mv_rtc_alarm_irq_enable,
	};

	static int __init mv_rtc_probe(struct platform_device *pdev)
	{
	struct rtc_plat_data *pdata;
	u32 rtc_time;
	int ret = 0;

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

	pdata->ioaddr = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(pdata->ioaddr))
	return PTR_ERR(pdata->ioaddr);

	pdata->clk = devm_clk_get(&pdev->dev, NULL);
	/* Not all SoCs require a clock.*/
	if (!IS_ERR(pdata->clk))
	clk_prepare_enable(pdata->clk);

	/* make sure the 24 hour mode is enabled */
	rtc_time = readl(pdata->ioaddr + RTC_TIME_REG_OFFS);
	if (rtc_time & RTC_HOURS_12H_MODE) {
	dev_err(&pdev->dev, "12 Hour mode is enabled but not supported.\n");
	ret = -EINVAL;
	goto out;
	}

	/* make sure it is actually functional */
	if (rtc_time == 0x01000000) {
	ssleep(1);
	rtc_time = readl(pdata->ioaddr + RTC_TIME_REG_OFFS);
	if (rtc_time == 0x01000000) {
	dev_err(&pdev->dev, "internal RTC not ticking\n");
	ret = -ENODEV;
	goto out;
	}
	}

	pdata->irq = platform_get_irq(pdev, 0);

	platform_set_drvdata(pdev, pdata);

	pdata->rtc = devm_rtc_allocate_device(&pdev->dev);
	if (IS_ERR(pdata->rtc)) {
	ret = PTR_ERR(pdata->rtc);
	goto out;
	}

	if (pdata->irq >= 0) {
	writel(0, pdata->ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
	if (devm_request_irq(&pdev->dev, pdata->irq, mv_rtc_interrupt,
	IRQF_SHARED,
	pdev->name, pdata) < 0) {
	dev_warn(&pdev->dev, "interrupt not available.\n");
	pdata->irq = -1;
	}
	}

	if (pdata->irq >= 0) {
	device_init_wakeup(&pdev->dev, 1);
	pdata->rtc->ops = &mv_rtc_alarm_ops;
	} else {
	pdata->rtc->ops = &mv_rtc_ops;
	}

	pdata->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
	pdata->rtc->range_max = RTC_TIMESTAMP_END_2099;

	ret = rtc_register_device(pdata->rtc);
	if (!ret)
	return 0;
	out:
	if (!IS_ERR(pdata->clk))
	clk_disable_unprepare(pdata->clk);

	return ret;
	}

	static int __exit mv_rtc_remove(struct platform_device *pdev)
	{
	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);

	if (pdata->irq >= 0)
	device_init_wakeup(&pdev->dev, 0);

	if (!IS_ERR(pdata->clk))
	clk_disable_unprepare(pdata->clk);

	return 0;
	}

	#ifdef CONFIG_OF
	static const struct of_device_id rtc_mv_of_match_table[] = {
	{ .compatible = "marvell,orion-rtc", },
	{}
	};
	MODULE_DEVICE_TABLE(of, rtc_mv_of_match_table);
	#endif

	static struct platform_driver mv_rtc_driver = {
	.remove = __exit_p(mv_rtc_remove),
	.driver = {
	.name = "rtc-mv",
	.of_match_table = of_match_ptr(rtc_mv_of_match_table),
	},
	};

	module_platform_driver_probe(mv_rtc_driver, mv_rtc_probe);

	MODULE_AUTHOR("Saeed Bishara <saeed@marvell.com>");
	MODULE_DESCRIPTION("Marvell RTC driver");
	MODULE_LICENSE("GPL");
	MODULE_ALIAS("platform:rtc-mv");