drivers/rtc/rtc-vr41xx.c - kernel/msm-4.9 - Gitiles

 /*
  *  Driver for NEC VR4100 series Real Time Clock unit.
  *
  *  Copyright (C) 2003-2008  Yoichi Yuasa <yuasa@linux-mips.org>
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
  *  the Free Software Foundation; either version 2 of the License, or
  *  (at your option) any later version.
  *
  *  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.
  *
  *  You should have received a copy of the GNU General Public License
  *  along with this program; if not, write to the Free Software
  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
 #include <linux/err.h>
 #include <linux/fs.h>
 #include <linux/init.h>
 #include <linux/ioport.h>
 #include <linux/interrupt.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/rtc.h>
 #include <linux/spinlock.h>
 #include <linux/types.h>
 #include <linux/log2.h>

 #include <asm/div64.h>
 #include <asm/io.h>
 #include <asm/uaccess.h>

 MODULE_AUTHOR("Yoichi Yuasa <yuasa@linux-mips.org>");
 MODULE_DESCRIPTION("NEC VR4100 series RTC driver");
 MODULE_LICENSE("GPL v2");

 /* RTC 1 registers */
 #define ETIMELREG		0x00
 #define ETIMEMREG		0x02
 #define ETIMEHREG		0x04
 /* RFU */
 #define ECMPLREG		0x08
 #define ECMPMREG		0x0a
 #define ECMPHREG		0x0c
 /* RFU */
 #define RTCL1LREG		0x10
 #define RTCL1HREG		0x12
 #define RTCL1CNTLREG		0x14
 #define RTCL1CNTHREG		0x16
 #define RTCL2LREG		0x18
 #define RTCL2HREG		0x1a
 #define RTCL2CNTLREG		0x1c
 #define RTCL2CNTHREG		0x1e

 /* RTC 2 registers */
 #define TCLKLREG		0x00
 #define TCLKHREG		0x02
 #define TCLKCNTLREG		0x04
 #define TCLKCNTHREG		0x06
 /* RFU */
 #define RTCINTREG		0x1e
  #define TCLOCK_INT		0x08
  #define RTCLONG2_INT		0x04
  #define RTCLONG1_INT		0x02
  #define ELAPSEDTIME_INT	0x01

 #define RTC_FREQUENCY		32768
 #define MAX_PERIODIC_RATE	6553

 static void __iomem *rtc1_base;
 static void __iomem *rtc2_base;

 #define rtc1_read(offset)		readw(rtc1_base + (offset))
 #define rtc1_write(offset, value)	writew((value), rtc1_base + (offset))

 #define rtc2_read(offset)		readw(rtc2_base + (offset))
 #define rtc2_write(offset, value)	writew((value), rtc2_base + (offset))

 static unsigned long epoch = 1970;	/* Jan 1 1970 00:00:00 */

 static DEFINE_SPINLOCK(rtc_lock);
 static char rtc_name[] = "RTC";
 static unsigned long periodic_count;
 static unsigned int alarm_enabled;
 static int aie_irq;
 static int pie_irq;

 static inline unsigned long read_elapsed_second(void)
 {

 	unsigned long first_low, first_mid, first_high;

 	unsigned long second_low, second_mid, second_high;

 	do {
 		first_low = rtc1_read(ETIMELREG);
 		first_mid = rtc1_read(ETIMEMREG);
 		first_high = rtc1_read(ETIMEHREG);
 		second_low = rtc1_read(ETIMELREG);
 		second_mid = rtc1_read(ETIMEMREG);
 		second_high = rtc1_read(ETIMEHREG);
 	} while (first_low != second_low || first_mid != second_mid ||
 	         first_high != second_high);

 	return (first_high << 17) | (first_mid << 1) | (first_low >> 15);
 }

 static inline void write_elapsed_second(unsigned long sec)
 {
 	spin_lock_irq(&rtc_lock);

 	rtc1_write(ETIMELREG, (uint16_t)(sec << 15));
 	rtc1_write(ETIMEMREG, (uint16_t)(sec >> 1));
 	rtc1_write(ETIMEHREG, (uint16_t)(sec >> 17));

 	spin_unlock_irq(&rtc_lock);
 }

 static void vr41xx_rtc_release(struct device *dev)
 {

 	spin_lock_irq(&rtc_lock);

 	rtc1_write(ECMPLREG, 0);
 	rtc1_write(ECMPMREG, 0);
 	rtc1_write(ECMPHREG, 0);
 	rtc1_write(RTCL1LREG, 0);
 	rtc1_write(RTCL1HREG, 0);

 	spin_unlock_irq(&rtc_lock);

 	disable_irq(aie_irq);
 	disable_irq(pie_irq);
 }

 static int vr41xx_rtc_read_time(struct device *dev, struct rtc_time *time)
 {
 	unsigned long epoch_sec, elapsed_sec;

 	epoch_sec = mktime(epoch, 1, 1, 0, 0, 0);
 	elapsed_sec = read_elapsed_second();

 	rtc_time_to_tm(epoch_sec + elapsed_sec, time);

 	return 0;
 }

 static int vr41xx_rtc_set_time(struct device *dev, struct rtc_time *time)
 {
 	unsigned long epoch_sec, current_sec;

 	epoch_sec = mktime(epoch, 1, 1, 0, 0, 0);
 	current_sec = mktime(time->tm_year + 1900, time->tm_mon + 1, time->tm_mday,
 	                     time->tm_hour, time->tm_min, time->tm_sec);

 	write_elapsed_second(current_sec - epoch_sec);

 	return 0;
 }

 static int vr41xx_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
 {
 	unsigned long low, mid, high;
 	struct rtc_time *time = &wkalrm->time;

 	spin_lock_irq(&rtc_lock);

 	low = rtc1_read(ECMPLREG);
 	mid = rtc1_read(ECMPMREG);
 	high = rtc1_read(ECMPHREG);
 	wkalrm->enabled = alarm_enabled;

 	spin_unlock_irq(&rtc_lock);

 	rtc_time_to_tm((high << 17) | (mid << 1) | (low >> 15), time);

 	return 0;
 }

 static int vr41xx_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *wkalrm)
 {
 	unsigned long alarm_sec;
 	struct rtc_time *time = &wkalrm->time;

 	alarm_sec = mktime(time->tm_year + 1900, time->tm_mon + 1, time->tm_mday,
 	                   time->tm_hour, time->tm_min, time->tm_sec);

 	spin_lock_irq(&rtc_lock);

 	if (alarm_enabled)
 		disable_irq(aie_irq);

 	rtc1_write(ECMPLREG, (uint16_t)(alarm_sec << 15));
 	rtc1_write(ECMPMREG, (uint16_t)(alarm_sec >> 1));
 	rtc1_write(ECMPHREG, (uint16_t)(alarm_sec >> 17));

 	if (wkalrm->enabled)
 		enable_irq(aie_irq);

 	alarm_enabled = wkalrm->enabled;

 	spin_unlock_irq(&rtc_lock);

 	return 0;
 }

 static int vr41xx_rtc_irq_set_freq(struct device *dev, int freq)
 {
 	unsigned long count;

 	if (!is_power_of_2(freq))
 		return -EINVAL;
 	count = RTC_FREQUENCY;
 	do_div(count, freq);

 	periodic_count = count;

 	spin_lock_irq(&rtc_lock);

 	rtc1_write(RTCL1LREG, count);
 	rtc1_write(RTCL1HREG, count >> 16);

 	spin_unlock_irq(&rtc_lock);

 	return 0;
 }

 static int vr41xx_rtc_irq_set_state(struct device *dev, int enabled)
 {
 	if (enabled)
 		enable_irq(pie_irq);
 	else
 		disable_irq(pie_irq);

 	return 0;
 }

 static int vr41xx_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
 {
 	switch (cmd) {
 	case RTC_AIE_ON:
 		spin_lock_irq(&rtc_lock);

 		if (!alarm_enabled) {
 			enable_irq(aie_irq);
 			alarm_enabled = 1;
 		}

 		spin_unlock_irq(&rtc_lock);
 		break;
 	case RTC_AIE_OFF:
 		spin_lock_irq(&rtc_lock);

 		if (alarm_enabled) {
 			disable_irq(aie_irq);
 			alarm_enabled = 0;
 		}

 		spin_unlock_irq(&rtc_lock);
 		break;
 	case RTC_EPOCH_READ:
 		return put_user(epoch, (unsigned long __user *)arg);
 	case RTC_EPOCH_SET:
 		/* Doesn't support before 1900 */
 		if (arg < 1900)
 			return -EINVAL;
 		epoch = arg;
 		break;
 	default:
 		return -ENOIOCTLCMD;
 	}

 	return 0;
 }

 static irqreturn_t elapsedtime_interrupt(int irq, void *dev_id)
 {
 	struct platform_device *pdev = (struct platform_device *)dev_id;
 	struct rtc_device *rtc = platform_get_drvdata(pdev);

 	rtc2_write(RTCINTREG, ELAPSEDTIME_INT);

 	rtc_update_irq(rtc, 1, RTC_AF);

 	return IRQ_HANDLED;
 }

 static irqreturn_t rtclong1_interrupt(int irq, void *dev_id)
 {
 	struct platform_device *pdev = (struct platform_device *)dev_id;
 	struct rtc_device *rtc = platform_get_drvdata(pdev);
 	unsigned long count = periodic_count;

 	rtc2_write(RTCINTREG, RTCLONG1_INT);

 	rtc1_write(RTCL1LREG, count);
 	rtc1_write(RTCL1HREG, count >> 16);

 	rtc_update_irq(rtc, 1, RTC_PF);

 	return IRQ_HANDLED;
 }

 static const struct rtc_class_ops vr41xx_rtc_ops = {
 	.release	= vr41xx_rtc_release,
 	.ioctl		= vr41xx_rtc_ioctl,
 	.read_time	= vr41xx_rtc_read_time,
 	.set_time	= vr41xx_rtc_set_time,
 	.read_alarm	= vr41xx_rtc_read_alarm,
 	.set_alarm	= vr41xx_rtc_set_alarm,
 	.irq_set_freq	= vr41xx_rtc_irq_set_freq,
 	.irq_set_state	= vr41xx_rtc_irq_set_state,
 };

 static int __devinit rtc_probe(struct platform_device *pdev)
 {
 	struct resource *res;
 	struct rtc_device *rtc;
 	int retval;

 	if (pdev->num_resources != 4)
 		return -EBUSY;

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

 	rtc1_base = ioremap(res->start, res->end - res->start + 1);
 	if (!rtc1_base)
 		return -EBUSY;

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 	if (!res) {
 		retval = -EBUSY;
 		goto err_rtc1_iounmap;
 	}

 	rtc2_base = ioremap(res->start, res->end - res->start + 1);
 	if (!rtc2_base) {
 		retval = -EBUSY;
 		goto err_rtc1_iounmap;
 	}

 	rtc = rtc_device_register(rtc_name, &pdev->dev, &vr41xx_rtc_ops, THIS_MODULE);
 	if (IS_ERR(rtc)) {
 		retval = PTR_ERR(rtc);
 		goto err_iounmap_all;
 	}

 	rtc->max_user_freq = MAX_PERIODIC_RATE;

 	spin_lock_irq(&rtc_lock);

 	rtc1_write(ECMPLREG, 0);
 	rtc1_write(ECMPMREG, 0);
 	rtc1_write(ECMPHREG, 0);
 	rtc1_write(RTCL1LREG, 0);
 	rtc1_write(RTCL1HREG, 0);

 	spin_unlock_irq(&rtc_lock);

 	aie_irq = platform_get_irq(pdev, 0);
 	if (aie_irq <= 0) {
 		retval = -EBUSY;
 		goto err_device_unregister;
 	}

 	retval = request_irq(aie_irq, elapsedtime_interrupt, IRQF_DISABLED,
 	                     "elapsed_time", pdev);
 	if (retval < 0)
 		goto err_device_unregister;

 	pie_irq = platform_get_irq(pdev, 1);
 	if (pie_irq <= 0)
 		goto err_free_irq;

 	retval = request_irq(pie_irq, rtclong1_interrupt, IRQF_DISABLED,
 		             "rtclong1", pdev);
 	if (retval < 0)
 		goto err_free_irq;

 	platform_set_drvdata(pdev, rtc);

 	disable_irq(aie_irq);
 	disable_irq(pie_irq);

 	printk(KERN_INFO "rtc: Real Time Clock of NEC VR4100 series\n");

 	return 0;

 err_free_irq:
 	free_irq(aie_irq, pdev);

 err_device_unregister:
 	rtc_device_unregister(rtc);

 err_iounmap_all:
 	iounmap(rtc2_base);
 	rtc2_base = NULL;

 err_rtc1_iounmap:
 	iounmap(rtc1_base);
 	rtc1_base = NULL;

 	return retval;
 }

 static int __devexit rtc_remove(struct platform_device *pdev)
 {
 	struct rtc_device *rtc;

 	rtc = platform_get_drvdata(pdev);
 	if (rtc)
 		rtc_device_unregister(rtc);

 	platform_set_drvdata(pdev, NULL);

 	free_irq(aie_irq, pdev);
 	free_irq(pie_irq, pdev);
 	if (rtc1_base)
 		iounmap(rtc1_base);
 	if (rtc2_base)
 		iounmap(rtc2_base);

 	return 0;
 }

 /* work with hotplug and coldplug */
 MODULE_ALIAS("platform:RTC");

 static struct platform_driver rtc_platform_driver = {
 	.probe		= rtc_probe,
 	.remove		= __devexit_p(rtc_remove),
 	.driver		= {
 		.name	= rtc_name,
 		.owner	= THIS_MODULE,
 	},
 };

 static int __init vr41xx_rtc_init(void)
 {
 	return platform_driver_register(&rtc_platform_driver);
 }

 static void __exit vr41xx_rtc_exit(void)
 {
 	platform_driver_unregister(&rtc_platform_driver);
 }

 module_init(vr41xx_rtc_init);
 module_exit(vr41xx_rtc_exit);
	/*
	* Driver for NEC VR4100 series Real Time Clock unit.
	*
	* Copyright (C) 2003-2008 Yoichi Yuasa <yuasa@linux-mips.org>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* 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.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	*/
	#include <linux/err.h>
	#include <linux/fs.h>
	#include <linux/init.h>
	#include <linux/ioport.h>
	#include <linux/interrupt.h>
	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/rtc.h>
	#include <linux/spinlock.h>
	#include <linux/types.h>
	#include <linux/log2.h>

	#include <asm/div64.h>
	#include <asm/io.h>
	#include <asm/uaccess.h>

	MODULE_AUTHOR("Yoichi Yuasa <yuasa@linux-mips.org>");
	MODULE_DESCRIPTION("NEC VR4100 series RTC driver");
	MODULE_LICENSE("GPL v2");

	/* RTC 1 registers */
	#define ETIMELREG 0x00
	#define ETIMEMREG 0x02
	#define ETIMEHREG 0x04
	/* RFU */
	#define ECMPLREG 0x08
	#define ECMPMREG 0x0a
	#define ECMPHREG 0x0c
	/* RFU */
	#define RTCL1LREG 0x10
	#define RTCL1HREG 0x12
	#define RTCL1CNTLREG 0x14
	#define RTCL1CNTHREG 0x16
	#define RTCL2LREG 0x18
	#define RTCL2HREG 0x1a
	#define RTCL2CNTLREG 0x1c
	#define RTCL2CNTHREG 0x1e

	/* RTC 2 registers */
	#define TCLKLREG 0x00
	#define TCLKHREG 0x02
	#define TCLKCNTLREG 0x04
	#define TCLKCNTHREG 0x06
	/* RFU */
	#define RTCINTREG 0x1e
	#define TCLOCK_INT 0x08
	#define RTCLONG2_INT 0x04
	#define RTCLONG1_INT 0x02
	#define ELAPSEDTIME_INT 0x01

	#define RTC_FREQUENCY 32768
	#define MAX_PERIODIC_RATE 6553

	static void __iomem *rtc1_base;
	static void __iomem *rtc2_base;

	#define rtc1_read(offset) readw(rtc1_base + (offset))
	#define rtc1_write(offset, value) writew((value), rtc1_base + (offset))

	#define rtc2_read(offset) readw(rtc2_base + (offset))
	#define rtc2_write(offset, value) writew((value), rtc2_base + (offset))

	static unsigned long epoch = 1970; /* Jan 1 1970 00:00:00 */

	static DEFINE_SPINLOCK(rtc_lock);
	static char rtc_name[] = "RTC";
	static unsigned long periodic_count;
	static unsigned int alarm_enabled;
	static int aie_irq;
	static int pie_irq;

	static inline unsigned long read_elapsed_second(void)
	{

	unsigned long first_low, first_mid, first_high;

	unsigned long second_low, second_mid, second_high;

	do {
	first_low = rtc1_read(ETIMELREG);
	first_mid = rtc1_read(ETIMEMREG);
	first_high = rtc1_read(ETIMEHREG);
	second_low = rtc1_read(ETIMELREG);
	second_mid = rtc1_read(ETIMEMREG);
	second_high = rtc1_read(ETIMEHREG);
	} while (first_low != second_low \|\| first_mid != second_mid \|\|
	first_high != second_high);

	return (first_high << 17) \| (first_mid << 1) \| (first_low >> 15);
	}

	static inline void write_elapsed_second(unsigned long sec)
	{
	spin_lock_irq(&rtc_lock);

	rtc1_write(ETIMELREG, (uint16_t)(sec << 15));
	rtc1_write(ETIMEMREG, (uint16_t)(sec >> 1));
	rtc1_write(ETIMEHREG, (uint16_t)(sec >> 17));

	spin_unlock_irq(&rtc_lock);
	}

	static void vr41xx_rtc_release(struct device *dev)
	{

	spin_lock_irq(&rtc_lock);

	rtc1_write(ECMPLREG, 0);
	rtc1_write(ECMPMREG, 0);
	rtc1_write(ECMPHREG, 0);
	rtc1_write(RTCL1LREG, 0);
	rtc1_write(RTCL1HREG, 0);

	spin_unlock_irq(&rtc_lock);

	disable_irq(aie_irq);
	disable_irq(pie_irq);
	}

	static int vr41xx_rtc_read_time(struct device dev, struct rtc_time time)
	{
	unsigned long epoch_sec, elapsed_sec;

	epoch_sec = mktime(epoch, 1, 1, 0, 0, 0);
	elapsed_sec = read_elapsed_second();

	rtc_time_to_tm(epoch_sec + elapsed_sec, time);

	return 0;
	}

	static int vr41xx_rtc_set_time(struct device dev, struct rtc_time time)
	{
	unsigned long epoch_sec, current_sec;

	epoch_sec = mktime(epoch, 1, 1, 0, 0, 0);
	current_sec = mktime(time->tm_year + 1900, time->tm_mon + 1, time->tm_mday,
	time->tm_hour, time->tm_min, time->tm_sec);

	write_elapsed_second(current_sec - epoch_sec);

	return 0;
	}

	static int vr41xx_rtc_read_alarm(struct device dev, struct rtc_wkalrm wkalrm)
	{
	unsigned long low, mid, high;
	struct rtc_time *time = &wkalrm->time;

	spin_lock_irq(&rtc_lock);

	low = rtc1_read(ECMPLREG);
	mid = rtc1_read(ECMPMREG);
	high = rtc1_read(ECMPHREG);
	wkalrm->enabled = alarm_enabled;

	spin_unlock_irq(&rtc_lock);

	rtc_time_to_tm((high << 17) \| (mid << 1) \| (low >> 15), time);

	return 0;
	}

	static int vr41xx_rtc_set_alarm(struct device dev, struct rtc_wkalrm wkalrm)
	{
	unsigned long alarm_sec;
	struct rtc_time *time = &wkalrm->time;

	alarm_sec = mktime(time->tm_year + 1900, time->tm_mon + 1, time->tm_mday,
	time->tm_hour, time->tm_min, time->tm_sec);

	spin_lock_irq(&rtc_lock);

	if (alarm_enabled)
	disable_irq(aie_irq);

	rtc1_write(ECMPLREG, (uint16_t)(alarm_sec << 15));
	rtc1_write(ECMPMREG, (uint16_t)(alarm_sec >> 1));
	rtc1_write(ECMPHREG, (uint16_t)(alarm_sec >> 17));

	if (wkalrm->enabled)
	enable_irq(aie_irq);

	alarm_enabled = wkalrm->enabled;

	spin_unlock_irq(&rtc_lock);

	return 0;
	}

	static int vr41xx_rtc_irq_set_freq(struct device *dev, int freq)
	{
	unsigned long count;

	if (!is_power_of_2(freq))
	return -EINVAL;
	count = RTC_FREQUENCY;
	do_div(count, freq);

	periodic_count = count;

	spin_lock_irq(&rtc_lock);

	rtc1_write(RTCL1LREG, count);
	rtc1_write(RTCL1HREG, count >> 16);

	spin_unlock_irq(&rtc_lock);

	return 0;
	}

	static int vr41xx_rtc_irq_set_state(struct device *dev, int enabled)
	{
	if (enabled)
	enable_irq(pie_irq);
	else
	disable_irq(pie_irq);

	return 0;
	}

	static int vr41xx_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
	{
	switch (cmd) {
	case RTC_AIE_ON:
	spin_lock_irq(&rtc_lock);

	if (!alarm_enabled) {
	enable_irq(aie_irq);
	alarm_enabled = 1;
	}

	spin_unlock_irq(&rtc_lock);
	break;
	case RTC_AIE_OFF:
	spin_lock_irq(&rtc_lock);

	if (alarm_enabled) {
	disable_irq(aie_irq);
	alarm_enabled = 0;
	}

	spin_unlock_irq(&rtc_lock);
	break;
	case RTC_EPOCH_READ:
	return put_user(epoch, (unsigned long __user *)arg);
	case RTC_EPOCH_SET:
	/* Doesn't support before 1900 */
	if (arg < 1900)
	return -EINVAL;
	epoch = arg;
	break;
	default:
	return -ENOIOCTLCMD;
	}

	return 0;
	}

	static irqreturn_t elapsedtime_interrupt(int irq, void *dev_id)
	{
	struct platform_device pdev = (struct platform_device )dev_id;
	struct rtc_device *rtc = platform_get_drvdata(pdev);

	rtc2_write(RTCINTREG, ELAPSEDTIME_INT);

	rtc_update_irq(rtc, 1, RTC_AF);

	return IRQ_HANDLED;
	}

	static irqreturn_t rtclong1_interrupt(int irq, void *dev_id)
	{
	struct platform_device pdev = (struct platform_device )dev_id;
	struct rtc_device *rtc = platform_get_drvdata(pdev);
	unsigned long count = periodic_count;

	rtc2_write(RTCINTREG, RTCLONG1_INT);

	rtc1_write(RTCL1LREG, count);
	rtc1_write(RTCL1HREG, count >> 16);

	rtc_update_irq(rtc, 1, RTC_PF);

	return IRQ_HANDLED;
	}

	static const struct rtc_class_ops vr41xx_rtc_ops = {
	.release = vr41xx_rtc_release,
	.ioctl = vr41xx_rtc_ioctl,
	.read_time = vr41xx_rtc_read_time,
	.set_time = vr41xx_rtc_set_time,
	.read_alarm = vr41xx_rtc_read_alarm,
	.set_alarm = vr41xx_rtc_set_alarm,
	.irq_set_freq = vr41xx_rtc_irq_set_freq,
	.irq_set_state = vr41xx_rtc_irq_set_state,
	};

	static int __devinit rtc_probe(struct platform_device *pdev)
	{
	struct resource *res;
	struct rtc_device *rtc;
	int retval;

	if (pdev->num_resources != 4)
	return -EBUSY;

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

	rtc1_base = ioremap(res->start, res->end - res->start + 1);
	if (!rtc1_base)
	return -EBUSY;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
	if (!res) {
	retval = -EBUSY;
	goto err_rtc1_iounmap;
	}

	rtc2_base = ioremap(res->start, res->end - res->start + 1);
	if (!rtc2_base) {
	retval = -EBUSY;
	goto err_rtc1_iounmap;
	}

	rtc = rtc_device_register(rtc_name, &pdev->dev, &vr41xx_rtc_ops, THIS_MODULE);
	if (IS_ERR(rtc)) {
	retval = PTR_ERR(rtc);
	goto err_iounmap_all;
	}

	rtc->max_user_freq = MAX_PERIODIC_RATE;

	spin_lock_irq(&rtc_lock);

	rtc1_write(ECMPLREG, 0);
	rtc1_write(ECMPMREG, 0);
	rtc1_write(ECMPHREG, 0);
	rtc1_write(RTCL1LREG, 0);
	rtc1_write(RTCL1HREG, 0);

	spin_unlock_irq(&rtc_lock);

	aie_irq = platform_get_irq(pdev, 0);
	if (aie_irq <= 0) {
	retval = -EBUSY;
	goto err_device_unregister;
	}

	retval = request_irq(aie_irq, elapsedtime_interrupt, IRQF_DISABLED,
	"elapsed_time", pdev);
	if (retval < 0)
	goto err_device_unregister;

	pie_irq = platform_get_irq(pdev, 1);
	if (pie_irq <= 0)
	goto err_free_irq;

	retval = request_irq(pie_irq, rtclong1_interrupt, IRQF_DISABLED,
	"rtclong1", pdev);
	if (retval < 0)
	goto err_free_irq;

	platform_set_drvdata(pdev, rtc);

	disable_irq(aie_irq);
	disable_irq(pie_irq);

	printk(KERN_INFO "rtc: Real Time Clock of NEC VR4100 series\n");

	return 0;

	err_free_irq:
	free_irq(aie_irq, pdev);

	err_device_unregister:
	rtc_device_unregister(rtc);

	err_iounmap_all:
	iounmap(rtc2_base);
	rtc2_base = NULL;

	err_rtc1_iounmap:
	iounmap(rtc1_base);
	rtc1_base = NULL;

	return retval;
	}

	static int __devexit rtc_remove(struct platform_device *pdev)
	{
	struct rtc_device *rtc;

	rtc = platform_get_drvdata(pdev);
	if (rtc)
	rtc_device_unregister(rtc);

	platform_set_drvdata(pdev, NULL);

	free_irq(aie_irq, pdev);
	free_irq(pie_irq, pdev);
	if (rtc1_base)
	iounmap(rtc1_base);
	if (rtc2_base)
	iounmap(rtc2_base);

	return 0;
	}

	/* work with hotplug and coldplug */
	MODULE_ALIAS("platform:RTC");

	static struct platform_driver rtc_platform_driver = {
	.probe = rtc_probe,
	.remove = __devexit_p(rtc_remove),
	.driver = {
	.name = rtc_name,
	.owner = THIS_MODULE,
	},
	};

	static int __init vr41xx_rtc_init(void)
	{
	return platform_driver_register(&rtc_platform_driver);
	}

	static void __exit vr41xx_rtc_exit(void)
	{
	platform_driver_unregister(&rtc_platform_driver);
	}

	module_init(vr41xx_rtc_init);
	module_exit(vr41xx_rtc_exit);