drivers/rtc/rtc-mv.c - kernel/skids - Git at Google

 /*
  * Driver for the RTC in Marvell SoCs.
  *
  * This file is licensed under the terms of the GNU General Public
  * License version 2.  This program is licensed "as is" without any
  * warranty of any kind, whether express or implied.
  */

 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/rtc.h>
 #include <linux/bcd.h>
 #include <linux/io.h>
 #include <linux/platform_device.h>
 #include <linux/delay.h>
 #include <linux/gfp.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		(1 << 22) /* 12 hours 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		(1 << 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;
 };

 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 hours 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 rtc_valid_tm(tm);
 }

 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 hours 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;

 	if (rtc_valid_tm(&alm->time) < 0) {
 		dev_err(dev, "retrieved alarm date/time is not valid.\n");
 		rtc_time_to_tm(0, &alm->time);
 	}

 	alm->enabled = !!readl(ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
 	return 0;
 }

 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_ioctl(struct device *dev, unsigned int cmd,
 			unsigned long arg)
 {
 	struct platform_device *pdev = to_platform_device(dev);
 	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
 	void __iomem *ioaddr = pdata->ioaddr;

 	if (pdata->irq < 0)
 		return -ENOIOCTLCMD; /* fall back into rtc-dev's emulation */
 	switch (cmd) {
 	case RTC_AIE_OFF:
 		writel(0, ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
 		break;
 	case RTC_AIE_ON:
 		writel(1, ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
 		break;
 	default:
 		return -ENOIOCTLCMD;
 	}
 	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,
 	.ioctl		= mv_rtc_ioctl,
 };

 static int __devinit mv_rtc_probe(struct platform_device *pdev)
 {
 	struct resource *res;
 	struct rtc_plat_data *pdata;
 	resource_size_t size;
 	u32 rtc_time;

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!res)
 		return -ENODEV;

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

 	size = resource_size(res);
 	if (!devm_request_mem_region(&pdev->dev, res->start, size,
 				     pdev->name))
 		return -EBUSY;

 	pdata->ioaddr = devm_ioremap(&pdev->dev, res->start, size);
 	if (!pdata->ioaddr)
 		return -ENOMEM;

 	/* make sure the 24 hours mode is enabled */
 	rtc_time = readl(pdata->ioaddr + RTC_TIME_REG_OFFS);
 	if (rtc_time & RTC_HOURS_12H_MODE) {
 		dev_err(&pdev->dev, "24 Hours mode not supported.\n");
 		return -EINVAL;
 	}

 	/* 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");
 			return -ENODEV;
 		}
 	}

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

 	platform_set_drvdata(pdev, pdata);

 	if (pdata->irq >= 0) {
 		device_init_wakeup(&pdev->dev, 1);
 		pdata->rtc = rtc_device_register(pdev->name, &pdev->dev,
 						 &mv_rtc_alarm_ops,
 						 THIS_MODULE);
 	} else
 		pdata->rtc = rtc_device_register(pdev->name, &pdev->dev,
 						 &mv_rtc_ops, THIS_MODULE);
 	if (IS_ERR(pdata->rtc))
 		return PTR_ERR(pdata->rtc);

 	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_DISABLED | IRQF_SHARED,
 				     pdev->name, pdata) < 0) {
 			dev_warn(&pdev->dev, "interrupt not available.\n");
 			pdata->irq = -1;
 		}
 	}

 	return 0;
 }

 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);

 	rtc_device_unregister(pdata->rtc);
 	return 0;
 }

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

 static __init int mv_init(void)
 {
 	return platform_driver_probe(&mv_rtc_driver, mv_rtc_probe);
 }

 static __exit void mv_exit(void)
 {
 	platform_driver_unregister(&mv_rtc_driver);
 }

 module_init(mv_init);
 module_exit(mv_exit);

 MODULE_AUTHOR("Saeed Bishara <saeed@marvell.com>");
 MODULE_DESCRIPTION("Marvell RTC driver");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:rtc-mv");
	/*
	* Driver for the RTC in Marvell SoCs.
	*
	* This file is licensed under the terms of the GNU General Public
	* License version 2. This program is licensed "as is" without any
	* warranty of any kind, whether express or implied.
	*/

	#include <linux/init.h>
	#include <linux/kernel.h>
	#include <linux/rtc.h>
	#include <linux/bcd.h>
	#include <linux/io.h>
	#include <linux/platform_device.h>
	#include <linux/delay.h>
	#include <linux/gfp.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 (1 << 22) /* 12 hours 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 (1 << 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;
	};

	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 hours 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 rtc_valid_tm(tm);
	}

	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 hours 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;

	if (rtc_valid_tm(&alm->time) < 0) {
	dev_err(dev, "retrieved alarm date/time is not valid.\n");
	rtc_time_to_tm(0, &alm->time);
	}

	alm->enabled = !!readl(ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
	return 0;
	}

	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_ioctl(struct device *dev, unsigned int cmd,
	unsigned long arg)
	{
	struct platform_device *pdev = to_platform_device(dev);
	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
	void __iomem *ioaddr = pdata->ioaddr;

	if (pdata->irq < 0)
	return -ENOIOCTLCMD; /* fall back into rtc-dev's emulation */
	switch (cmd) {
	case RTC_AIE_OFF:
	writel(0, ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
	break;
	case RTC_AIE_ON:
	writel(1, ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
	break;
	default:
	return -ENOIOCTLCMD;
	}
	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,
	.ioctl = mv_rtc_ioctl,
	};

	static int __devinit mv_rtc_probe(struct platform_device *pdev)
	{
	struct resource *res;
	struct rtc_plat_data *pdata;
	resource_size_t size;
	u32 rtc_time;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res)
	return -ENODEV;

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

	size = resource_size(res);
	if (!devm_request_mem_region(&pdev->dev, res->start, size,
	pdev->name))
	return -EBUSY;

	pdata->ioaddr = devm_ioremap(&pdev->dev, res->start, size);
	if (!pdata->ioaddr)
	return -ENOMEM;

	/* make sure the 24 hours mode is enabled */
	rtc_time = readl(pdata->ioaddr + RTC_TIME_REG_OFFS);
	if (rtc_time & RTC_HOURS_12H_MODE) {
	dev_err(&pdev->dev, "24 Hours mode not supported.\n");
	return -EINVAL;
	}

	/* 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");
	return -ENODEV;
	}
	}

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

	platform_set_drvdata(pdev, pdata);

	if (pdata->irq >= 0) {
	device_init_wakeup(&pdev->dev, 1);
	pdata->rtc = rtc_device_register(pdev->name, &pdev->dev,
	&mv_rtc_alarm_ops,
	THIS_MODULE);
	} else
	pdata->rtc = rtc_device_register(pdev->name, &pdev->dev,
	&mv_rtc_ops, THIS_MODULE);
	if (IS_ERR(pdata->rtc))
	return PTR_ERR(pdata->rtc);

	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_DISABLED \| IRQF_SHARED,
	pdev->name, pdata) < 0) {
	dev_warn(&pdev->dev, "interrupt not available.\n");
	pdata->irq = -1;
	}
	}

	return 0;
	}

	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);

	rtc_device_unregister(pdata->rtc);
	return 0;
	}

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

	static __init int mv_init(void)
	{
	return platform_driver_probe(&mv_rtc_driver, mv_rtc_probe);
	}

	static __exit void mv_exit(void)
	{
	platform_driver_unregister(&mv_rtc_driver);
	}

	module_init(mv_init);
	module_exit(mv_exit);

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