/* drivers/rtc/rtc-s3c.c
   *

   * Copyright (c) 2010 Samsung Electronics Co., Ltd.
   *		http://www.samsung.com/
   *

   * Copyright (c) 2004,2006 Simtec Electronics
   *	Ben Dooks, <ben@simtec.co.uk>
   *	http://armlinux.simtec.co.uk/
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
   *
   * S3C2410/S3C2440/S3C24XX Internal RTC Driver
  */
  
  #include <linux/module.h>
  #include <linux/fs.h>
  #include <linux/string.h>
  #include <linux/init.h>
  #include <linux/platform_device.h>
  #include <linux/interrupt.h>
  #include <linux/rtc.h>
  #include <linux/bcd.h>
  #include <linux/clk.h>

  #include <linux/log2.h>

  #include <linux/slab.h>

  #include <linux/of.h>

  #include <mach/hardware.h>

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

  #include <plat/regs-rtc.h>

  enum s3c_cpu_type {
  	TYPE_S3C2410,
  	TYPE_S3C64XX,
  };

  /* I have yet to find an S3C implementation with more than one
   * of these rtc blocks in */
  
  static struct resource *s3c_rtc_mem;

  static struct clk *rtc_clk;

  static void __iomem *s3c_rtc_base;
  static int s3c_rtc_alarmno = NO_IRQ;
  static int s3c_rtc_tickno  = NO_IRQ;

  static bool wake_en;

  static enum s3c_cpu_type s3c_rtc_cpu_type;

  
  static DEFINE_SPINLOCK(s3c_rtc_pie_lock);

  static void s3c_rtc_alarm_clk_enable(bool enable)
  {
  	static DEFINE_SPINLOCK(s3c_rtc_alarm_clk_lock);
  	static bool alarm_clk_enabled;
  	unsigned long irq_flags;
  
  	spin_lock_irqsave(&s3c_rtc_alarm_clk_lock, irq_flags);
  	if (enable) {
  		if (!alarm_clk_enabled) {
  			clk_enable(rtc_clk);
  			alarm_clk_enabled = true;
  		}
  	} else {
  		if (alarm_clk_enabled) {
  			clk_disable(rtc_clk);
  			alarm_clk_enabled = false;
  		}
  	}
  	spin_unlock_irqrestore(&s3c_rtc_alarm_clk_lock, irq_flags);
  }

  /* IRQ Handlers */

  static irqreturn_t s3c_rtc_alarmirq(int irq, void *id)

  {
  	struct rtc_device *rdev = id;

  	clk_enable(rtc_clk);

  	rtc_update_irq(rdev, 1, RTC_AF | RTC_IRQF);

  
  	if (s3c_rtc_cpu_type == TYPE_S3C64XX)
  		writeb(S3C2410_INTP_ALM, s3c_rtc_base + S3C2410_INTP);

  	clk_disable(rtc_clk);

  
  	s3c_rtc_alarm_clk_enable(false);

  	return IRQ_HANDLED;
  }

  static irqreturn_t s3c_rtc_tickirq(int irq, void *id)

  {
  	struct rtc_device *rdev = id;

  	clk_enable(rtc_clk);

  	rtc_update_irq(rdev, 1, RTC_PF | RTC_IRQF);

  
  	if (s3c_rtc_cpu_type == TYPE_S3C64XX)
  		writeb(S3C2410_INTP_TIC, s3c_rtc_base + S3C2410_INTP);

  	clk_disable(rtc_clk);

  	return IRQ_HANDLED;
  }
  
  /* Update control registers */

  static int s3c_rtc_setaie(struct device *dev, unsigned int enabled)

  {
  	unsigned int tmp;

  	pr_debug("%s: aie=%d
  ", __func__, enabled);

  	clk_enable(rtc_clk);

  	tmp = readb(s3c_rtc_base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;

  	if (enabled)

  		tmp |= S3C2410_RTCALM_ALMEN;

  	writeb(tmp, s3c_rtc_base + S3C2410_RTCALM);

  	clk_disable(rtc_clk);

  	s3c_rtc_alarm_clk_enable(enabled);

  	return 0;

  }

  static int s3c_rtc_setfreq(struct device *dev, int freq)

  {

  	struct platform_device *pdev = to_platform_device(dev);
  	struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
  	unsigned int tmp = 0;

  	if (!is_power_of_2(freq))
  		return -EINVAL;

  	clk_enable(rtc_clk);

  	spin_lock_irq(&s3c_rtc_pie_lock);

  	if (s3c_rtc_cpu_type == TYPE_S3C2410) {
  		tmp = readb(s3c_rtc_base + S3C2410_TICNT);
  		tmp &= S3C2410_TICNT_ENABLE;
  	}
  
  	tmp |= (rtc_dev->max_user_freq / freq)-1;

  	writel(tmp, s3c_rtc_base + S3C2410_TICNT);

  	spin_unlock_irq(&s3c_rtc_pie_lock);

  	clk_disable(rtc_clk);

  
  	return 0;

  }
  
  /* Time read/write */
  
  static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
  {
  	unsigned int have_retried = 0;

  	void __iomem *base = s3c_rtc_base;

  	clk_enable(rtc_clk);

   retry_get_time:

  	rtc_tm->tm_min  = readb(base + S3C2410_RTCMIN);
  	rtc_tm->tm_hour = readb(base + S3C2410_RTCHOUR);
  	rtc_tm->tm_mday = readb(base + S3C2410_RTCDATE);
  	rtc_tm->tm_mon  = readb(base + S3C2410_RTCMON);
  	rtc_tm->tm_year = readb(base + S3C2410_RTCYEAR);
  	rtc_tm->tm_sec  = readb(base + S3C2410_RTCSEC);

  
  	/* the only way to work out wether the system was mid-update
  	 * when we read it is to check the second counter, and if it
  	 * is zero, then we re-try the entire read
  	 */
  
  	if (rtc_tm->tm_sec == 0 && !have_retried) {
  		have_retried = 1;
  		goto retry_get_time;
  	}

  	rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec);
  	rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min);
  	rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour);
  	rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday);
  	rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
  	rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);

  
  	rtc_tm->tm_year += 100;

  
  	pr_debug("read time %04d.%02d.%02d %02d:%02d:%02d
  ",
  		 1900 + rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday,
  		 rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);

  	rtc_tm->tm_mon -= 1;

  	clk_disable(rtc_clk);

  	return rtc_valid_tm(rtc_tm);

  }
  
  static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
  {

  	void __iomem *base = s3c_rtc_base;

  	int year = tm->tm_year - 100;

  	pr_debug("set time %04d.%02d.%02d %02d:%02d:%02d
  ",
  		 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,

  		 tm->tm_hour, tm->tm_min, tm->tm_sec);
  
  	/* we get around y2k by simply not supporting it */

  	if (year < 0 || year >= 100) {

  		dev_err(dev, "rtc only supports 100 years
  ");

  		return -EINVAL;

  	}

  	clk_enable(rtc_clk);

  	writeb(bin2bcd(tm->tm_sec),  base + S3C2410_RTCSEC);
  	writeb(bin2bcd(tm->tm_min),  base + S3C2410_RTCMIN);
  	writeb(bin2bcd(tm->tm_hour), base + S3C2410_RTCHOUR);
  	writeb(bin2bcd(tm->tm_mday), base + S3C2410_RTCDATE);
  	writeb(bin2bcd(tm->tm_mon + 1), base + S3C2410_RTCMON);
  	writeb(bin2bcd(year), base + S3C2410_RTCYEAR);

  	clk_disable(rtc_clk);

  
  	return 0;
  }
  
  static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
  {
  	struct rtc_time *alm_tm = &alrm->time;

  	void __iomem *base = s3c_rtc_base;

  	unsigned int alm_en;

  	clk_enable(rtc_clk);

  	alm_tm->tm_sec  = readb(base + S3C2410_ALMSEC);
  	alm_tm->tm_min  = readb(base + S3C2410_ALMMIN);
  	alm_tm->tm_hour = readb(base + S3C2410_ALMHOUR);
  	alm_tm->tm_mon  = readb(base + S3C2410_ALMMON);
  	alm_tm->tm_mday = readb(base + S3C2410_ALMDATE);
  	alm_tm->tm_year = readb(base + S3C2410_ALMYEAR);

  	alm_en = readb(base + S3C2410_RTCALM);

  	alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0;

  	pr_debug("read alarm %d, %04d.%02d.%02d %02d:%02d:%02d
  ",

  		 alm_en,

  		 1900 + alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday,

  		 alm_tm->tm_hour, alm_tm->tm_min, alm_tm->tm_sec);
  
  
  	/* decode the alarm enable field */
  
  	if (alm_en & S3C2410_RTCALM_SECEN)

  		alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec);

  	else

  		alm_tm->tm_sec = -1;

  
  	if (alm_en & S3C2410_RTCALM_MINEN)

  		alm_tm->tm_min = bcd2bin(alm_tm->tm_min);

  	else

  		alm_tm->tm_min = -1;

  
  	if (alm_en & S3C2410_RTCALM_HOUREN)

  		alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour);

  	else

  		alm_tm->tm_hour = -1;

  
  	if (alm_en & S3C2410_RTCALM_DAYEN)

  		alm_tm->tm_mday = bcd2bin(alm_tm->tm_mday);

  	else

  		alm_tm->tm_mday = -1;

  
  	if (alm_en & S3C2410_RTCALM_MONEN) {

  		alm_tm->tm_mon = bcd2bin(alm_tm->tm_mon);

  		alm_tm->tm_mon -= 1;
  	} else {

  		alm_tm->tm_mon = -1;

  	}
  
  	if (alm_en & S3C2410_RTCALM_YEAREN)

  		alm_tm->tm_year = bcd2bin(alm_tm->tm_year);

  	else

  		alm_tm->tm_year = -1;

  	clk_disable(rtc_clk);

  	return 0;
  }
  
  static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
  {
  	struct rtc_time *tm = &alrm->time;

  	void __iomem *base = s3c_rtc_base;

  	unsigned int alrm_en;

  	clk_enable(rtc_clk);

  	pr_debug("s3c_rtc_setalarm: %d, %04d.%02d.%02d %02d:%02d:%02d
  ",

  		 alrm->enabled,

  		 1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday,

  		 tm->tm_hour, tm->tm_min, tm->tm_sec);

  	alrm_en = readb(base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
  	writeb(0x00, base + S3C2410_RTCALM);

  
  	if (tm->tm_sec < 60 && tm->tm_sec >= 0) {
  		alrm_en |= S3C2410_RTCALM_SECEN;

  		writeb(bin2bcd(tm->tm_sec), base + S3C2410_ALMSEC);

  	}
  
  	if (tm->tm_min < 60 && tm->tm_min >= 0) {
  		alrm_en |= S3C2410_RTCALM_MINEN;

  		writeb(bin2bcd(tm->tm_min), base + S3C2410_ALMMIN);

  	}
  
  	if (tm->tm_hour < 24 && tm->tm_hour >= 0) {
  		alrm_en |= S3C2410_RTCALM_HOUREN;

  		writeb(bin2bcd(tm->tm_hour), base + S3C2410_ALMHOUR);

  	}
  
  	pr_debug("setting S3C2410_RTCALM to %08x
  ", alrm_en);

  	writeb(alrm_en, base + S3C2410_RTCALM);

  	s3c_rtc_setaie(dev, alrm->enabled);

  	clk_disable(rtc_clk);

  	return 0;
  }

  static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
  {

  	unsigned int ticnt;

  	clk_enable(rtc_clk);

  	if (s3c_rtc_cpu_type == TYPE_S3C64XX) {

  		ticnt = readw(s3c_rtc_base + S3C2410_RTCCON);

  		ticnt &= S3C64XX_RTCCON_TICEN;
  	} else {
  		ticnt = readb(s3c_rtc_base + S3C2410_TICNT);
  		ticnt &= S3C2410_TICNT_ENABLE;
  	}
  
  	seq_printf(seq, "periodic_IRQ\t: %s
  ", ticnt  ? "yes" : "no");

  	clk_disable(rtc_clk);

  	return 0;
  }

  static const struct rtc_class_ops s3c_rtcops = {

  	.read_time	= s3c_rtc_gettime,
  	.set_time	= s3c_rtc_settime,
  	.read_alarm	= s3c_rtc_getalarm,
  	.set_alarm	= s3c_rtc_setalarm,

  	.proc		= s3c_rtc_proc,
  	.alarm_irq_enable = s3c_rtc_setaie,

  };
  
  static void s3c_rtc_enable(struct platform_device *pdev, int en)
  {

  	void __iomem *base = s3c_rtc_base;

  	unsigned int tmp;
  
  	if (s3c_rtc_base == NULL)
  		return;

  	clk_enable(rtc_clk);

  	if (!en) {

  		tmp = readw(base + S3C2410_RTCCON);

  		if (s3c_rtc_cpu_type == TYPE_S3C64XX)
  			tmp &= ~S3C64XX_RTCCON_TICEN;
  		tmp &= ~S3C2410_RTCCON_RTCEN;

  		writew(tmp, base + S3C2410_RTCCON);

  
  		if (s3c_rtc_cpu_type == TYPE_S3C2410) {
  			tmp = readb(base + S3C2410_TICNT);
  			tmp &= ~S3C2410_TICNT_ENABLE;
  			writeb(tmp, base + S3C2410_TICNT);
  		}

  	} else {
  		/* re-enable the device, and check it is ok */

  		if ((readw(base+S3C2410_RTCCON) & S3C2410_RTCCON_RTCEN) == 0) {

  			dev_info(&pdev->dev, "rtc disabled, re-enabling
  ");

  			tmp = readw(base + S3C2410_RTCCON);
  			writew(tmp | S3C2410_RTCCON_RTCEN,
  				base + S3C2410_RTCCON);

  		}

  		if ((readw(base + S3C2410_RTCCON) & S3C2410_RTCCON_CNTSEL)) {

  			dev_info(&pdev->dev, "removing RTCCON_CNTSEL
  ");

  			tmp = readw(base + S3C2410_RTCCON);
  			writew(tmp & ~S3C2410_RTCCON_CNTSEL,
  				base + S3C2410_RTCCON);

  		}

  		if ((readw(base + S3C2410_RTCCON) & S3C2410_RTCCON_CLKRST)) {

  			dev_info(&pdev->dev, "removing RTCCON_CLKRST
  ");

  			tmp = readw(base + S3C2410_RTCCON);
  			writew(tmp & ~S3C2410_RTCCON_CLKRST,
  				base + S3C2410_RTCCON);

  		}
  	}

  	clk_disable(rtc_clk);

  }

  static int __devexit s3c_rtc_remove(struct platform_device *dev)

  {
  	struct rtc_device *rtc = platform_get_drvdata(dev);

  	free_irq(s3c_rtc_alarmno, rtc);
  	free_irq(s3c_rtc_tickno, rtc);

  	platform_set_drvdata(dev, NULL);
  	rtc_device_unregister(rtc);

  	s3c_rtc_setaie(&dev->dev, 0);

  	clk_put(rtc_clk);
  	rtc_clk = NULL;

  	iounmap(s3c_rtc_base);
  	release_resource(s3c_rtc_mem);
  	kfree(s3c_rtc_mem);
  
  	return 0;
  }

  static int __devinit s3c_rtc_probe(struct platform_device *pdev)

  {
  	struct rtc_device *rtc;

  	struct rtc_time rtc_tm;

  	struct resource *res;
  	int ret;

  	pr_debug("%s: probe=%p
  ", __func__, pdev);

  
  	/* find the IRQs */
  
  	s3c_rtc_tickno = platform_get_irq(pdev, 1);
  	if (s3c_rtc_tickno < 0) {
  		dev_err(&pdev->dev, "no irq for rtc tick
  ");
  		return -ENOENT;
  	}
  
  	s3c_rtc_alarmno = platform_get_irq(pdev, 0);
  	if (s3c_rtc_alarmno < 0) {
  		dev_err(&pdev->dev, "no irq for alarm
  ");
  		return -ENOENT;
  	}
  
  	pr_debug("s3c2410_rtc: tick irq %d, alarm irq %d
  ",
  		 s3c_rtc_tickno, s3c_rtc_alarmno);
  
  	/* get the memory region */
  
  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  	if (res == NULL) {
  		dev_err(&pdev->dev, "failed to get memory region resource
  ");
  		return -ENOENT;
  	}

  	s3c_rtc_mem = request_mem_region(res->start, resource_size(res),

  					 pdev->name);

  
  	if (s3c_rtc_mem == NULL) {
  		dev_err(&pdev->dev, "failed to reserve memory region
  ");
  		ret = -ENOENT;
  		goto err_nores;
  	}

  	s3c_rtc_base = ioremap(res->start, resource_size(res));

  	if (s3c_rtc_base == NULL) {
  		dev_err(&pdev->dev, "failed ioremap()
  ");
  		ret = -EINVAL;
  		goto err_nomap;
  	}

  	rtc_clk = clk_get(&pdev->dev, "rtc");
  	if (IS_ERR(rtc_clk)) {
  		dev_err(&pdev->dev, "failed to find rtc clock source
  ");
  		ret = PTR_ERR(rtc_clk);
  		rtc_clk = NULL;
  		goto err_clk;
  	}
  
  	clk_enable(rtc_clk);

  	/* check to see if everything is setup correctly */
  
  	s3c_rtc_enable(pdev, 1);

  	pr_debug("s3c2410_rtc: RTCCON=%02x
  ",
  		 readw(s3c_rtc_base + S3C2410_RTCCON));

  	device_init_wakeup(&pdev->dev, 1);

  	/* register RTC and exit */
  
  	rtc = rtc_device_register("s3c", &pdev->dev, &s3c_rtcops,
  				  THIS_MODULE);
  
  	if (IS_ERR(rtc)) {
  		dev_err(&pdev->dev, "cannot attach rtc
  ");
  		ret = PTR_ERR(rtc);
  		goto err_nortc;
  	}

  #ifdef CONFIG_OF
  	if (pdev->dev.of_node)
  		s3c_rtc_cpu_type = of_device_is_compatible(pdev->dev.of_node,
  			"samsung,s3c6410-rtc") ? TYPE_S3C64XX : TYPE_S3C2410;
  	else
  #endif
  		s3c_rtc_cpu_type = platform_get_device_id(pdev)->driver_data;

  	/* Check RTC Time */

  	s3c_rtc_gettime(NULL, &rtc_tm);

  	if (rtc_valid_tm(&rtc_tm)) {
  		rtc_tm.tm_year	= 100;
  		rtc_tm.tm_mon	= 0;
  		rtc_tm.tm_mday	= 1;
  		rtc_tm.tm_hour	= 0;
  		rtc_tm.tm_min	= 0;
  		rtc_tm.tm_sec	= 0;
  
  		s3c_rtc_settime(NULL, &rtc_tm);
  
  		dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it
  ");

  	}

  	if (s3c_rtc_cpu_type == TYPE_S3C64XX)
  		rtc->max_user_freq = 32768;
  	else
  		rtc->max_user_freq = 128;

  	platform_set_drvdata(pdev, rtc);

  
  	s3c_rtc_setfreq(&pdev->dev, 1);

  	ret = request_irq(s3c_rtc_alarmno, s3c_rtc_alarmirq,
  			  IRQF_DISABLED,  "s3c2410-rtc alarm", rtc);
  	if (ret) {
  		dev_err(&pdev->dev, "IRQ%d error %d
  ", s3c_rtc_alarmno, ret);
  		goto err_alarm_irq;
  	}
  
  	ret = request_irq(s3c_rtc_tickno, s3c_rtc_tickirq,
  			  IRQF_DISABLED,  "s3c2410-rtc tick", rtc);
  	if (ret) {
  		dev_err(&pdev->dev, "IRQ%d error %d
  ", s3c_rtc_tickno, ret);
  		free_irq(s3c_rtc_alarmno, rtc);
  		goto err_tick_irq;
  	}

  	clk_disable(rtc_clk);

  	return 0;

   err_tick_irq:
  	free_irq(s3c_rtc_alarmno, rtc);
  
   err_alarm_irq:
  	platform_set_drvdata(pdev, NULL);
  	rtc_device_unregister(rtc);

   err_nortc:
  	s3c_rtc_enable(pdev, 0);

  	clk_disable(rtc_clk);
  	clk_put(rtc_clk);
  
   err_clk:

  	iounmap(s3c_rtc_base);
  
   err_nomap:
  	release_resource(s3c_rtc_mem);
  
   err_nores:
  	return ret;
  }
  
  #ifdef CONFIG_PM
  
  /* RTC Power management control */

  static int ticnt_save, ticnt_en_save;

  
  static int s3c_rtc_suspend(struct platform_device *pdev, pm_message_t state)
  {

  	clk_enable(rtc_clk);

  	/* save TICNT for anyone using periodic interrupts */

  	ticnt_save = readb(s3c_rtc_base + S3C2410_TICNT);

  	if (s3c_rtc_cpu_type == TYPE_S3C64XX) {

  		ticnt_en_save = readw(s3c_rtc_base + S3C2410_RTCCON);

  		ticnt_en_save &= S3C64XX_RTCCON_TICEN;
  	}

  	s3c_rtc_enable(pdev, 0);

  	if (device_may_wakeup(&pdev->dev) && !wake_en) {
  		if (enable_irq_wake(s3c_rtc_alarmno) == 0)
  			wake_en = true;
  		else
  			dev_err(&pdev->dev, "enable_irq_wake failed
  ");
  	}

  	clk_disable(rtc_clk);

  	return 0;
  }
  
  static int s3c_rtc_resume(struct platform_device *pdev)
  {

  	unsigned int tmp;

  	clk_enable(rtc_clk);

  	s3c_rtc_enable(pdev, 1);

  	writeb(ticnt_save, s3c_rtc_base + S3C2410_TICNT);

  	if (s3c_rtc_cpu_type == TYPE_S3C64XX && ticnt_en_save) {

  		tmp = readw(s3c_rtc_base + S3C2410_RTCCON);
  		writew(tmp | ticnt_en_save, s3c_rtc_base + S3C2410_RTCCON);

  	}

  	if (device_may_wakeup(&pdev->dev) && wake_en) {

  		disable_irq_wake(s3c_rtc_alarmno);

  		wake_en = false;
  	}

  	clk_disable(rtc_clk);

  	return 0;
  }
  #else
  #define s3c_rtc_suspend NULL
  #define s3c_rtc_resume  NULL
  #endif

  #ifdef CONFIG_OF
  static const struct of_device_id s3c_rtc_dt_match[] = {
  	{ .compatible = "samsung,s3c2410-rtc" },
  	{ .compatible = "samsung,s3c6410-rtc" },
  	{},
  };
  MODULE_DEVICE_TABLE(of, s3c_rtc_dt_match);
  #else
  #define s3c_rtc_dt_match NULL
  #endif

  static struct platform_device_id s3c_rtc_driver_ids[] = {
  	{
  		.name		= "s3c2410-rtc",
  		.driver_data	= TYPE_S3C2410,
  	}, {
  		.name		= "s3c64xx-rtc",
  		.driver_data	= TYPE_S3C64XX,
  	},
  	{ }
  };
  
  MODULE_DEVICE_TABLE(platform, s3c_rtc_driver_ids);
  
  static struct platform_driver s3c_rtc_driver = {

  	.probe		= s3c_rtc_probe,

  	.remove		= __devexit_p(s3c_rtc_remove),

  	.suspend	= s3c_rtc_suspend,
  	.resume		= s3c_rtc_resume,

  	.id_table	= s3c_rtc_driver_ids,

  	.driver		= {

  		.name	= "s3c-rtc",

  		.owner	= THIS_MODULE,

  		.of_match_table	= s3c_rtc_dt_match,

  	},
  };

  module_platform_driver(s3c_rtc_driver);

  
  MODULE_DESCRIPTION("Samsung S3C RTC Driver");
  MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
  MODULE_LICENSE("GPL");

  MODULE_ALIAS("platform:s3c2410-rtc");