/* 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 <linux/uaccess.h>
  #include <linux/io.h>
  
  #include <asm/irq.h>
  #include "rtc-s3c.h"
  
  enum s3c_cpu_type {
  	TYPE_S3C2410,
  	TYPE_S3C2416,
  	TYPE_S3C2443,
  	TYPE_S3C64XX,
  };
  
  struct s3c_rtc_drv_data {
  	int cpu_type;
  };
  
  /* I have yet to find an S3C implementation with more than one
   * of these rtc blocks in */
  
  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 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;
  
  	dev_dbg(dev, "%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;
  	int val;
  
  	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_S3C64XX) {
  		tmp = readb(s3c_rtc_base + S3C2410_TICNT);
  		tmp &= S3C2410_TICNT_ENABLE;
  	}
  
  	val = (rtc_dev->max_user_freq / freq) - 1;
  
  	if (s3c_rtc_cpu_type == TYPE_S3C2416 || s3c_rtc_cpu_type == TYPE_S3C2443) {
  		tmp |= S3C2443_TICNT_PART(val);
  		writel(S3C2443_TICNT1_PART(val), s3c_rtc_base + S3C2443_TICNT1);
  
  		if (s3c_rtc_cpu_type == TYPE_S3C2416)
  			writel(S3C2416_TICNT2_PART(val), s3c_rtc_base + S3C2416_TICNT2);
  	} else {
  		tmp |= val;
  	}
  
  	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 whether 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;
  
  	dev_dbg(dev, "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;
  
  	dev_dbg(dev, "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;
  
  	dev_dbg(dev, "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);
  	dev_dbg(dev, "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);
  	}
  
  	dev_dbg(dev, "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_S3C64XX) {
  			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 s3c_rtc_remove(struct platform_device *dev)
  {
  	s3c_rtc_setaie(&dev->dev, 0);
  
  	clk_unprepare(rtc_clk);
  	rtc_clk = NULL;
  
  	return 0;
  }
  
  static const struct of_device_id s3c_rtc_dt_match[];
  
  static inline int s3c_rtc_get_driver_data(struct platform_device *pdev)
  {
  #ifdef CONFIG_OF
  	struct s3c_rtc_drv_data *data;
  	if (pdev->dev.of_node) {
  		const struct of_device_id *match;
  		match = of_match_node(s3c_rtc_dt_match, pdev->dev.of_node);
  		data = (struct s3c_rtc_drv_data *) match->data;
  		return data->cpu_type;
  	}
  #endif
  	return platform_get_device_id(pdev)->driver_data;
  }
  
  static int s3c_rtc_probe(struct platform_device *pdev)
  {
  	struct rtc_device *rtc;
  	struct rtc_time rtc_tm;
  	struct resource *res;
  	int ret;
  	int tmp;
  
  	dev_dbg(&pdev->dev, "%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 s3c_rtc_tickno;
  	}
  
  	s3c_rtc_alarmno = platform_get_irq(pdev, 0);
  	if (s3c_rtc_alarmno < 0) {
  		dev_err(&pdev->dev, "no irq for alarm
  ");
  		return s3c_rtc_alarmno;
  	}
  
  	dev_dbg(&pdev->dev, "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);
  	s3c_rtc_base = devm_ioremap_resource(&pdev->dev, res);
  	if (IS_ERR(s3c_rtc_base))
  		return PTR_ERR(s3c_rtc_base);
  
  	rtc_clk = devm_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;
  		return ret;
  	}
  
  	clk_prepare_enable(rtc_clk);
  
  	/* check to see if everything is setup correctly */
  
  	s3c_rtc_enable(pdev, 1);
  
  	dev_dbg(&pdev->dev, "s3c2410_rtc: RTCCON=%02x
  ",
  		 readw(s3c_rtc_base + S3C2410_RTCCON));
  
  	device_init_wakeup(&pdev->dev, 1);
  
  	/* register RTC and exit */
  
  	rtc = devm_rtc_device_register(&pdev->dev, "s3c", &s3c_rtcops,
  				  THIS_MODULE);
  
  	if (IS_ERR(rtc)) {
  		dev_err(&pdev->dev, "cannot attach rtc
  ");
  		ret = PTR_ERR(rtc);
  		goto err_nortc;
  	}
  
  	s3c_rtc_cpu_type = s3c_rtc_get_driver_data(pdev);
  
  	/* 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_S3C2410)
  		rtc->max_user_freq = 32768;
  	else
  		rtc->max_user_freq = 128;
  
  	if (s3c_rtc_cpu_type == TYPE_S3C2416 || s3c_rtc_cpu_type == TYPE_S3C2443) {
  		tmp = readw(s3c_rtc_base + S3C2410_RTCCON);
  		tmp |= S3C2443_RTCCON_TICSEL;
  		writew(tmp, s3c_rtc_base + S3C2410_RTCCON);
  	}
  
  	platform_set_drvdata(pdev, rtc);
  
  	s3c_rtc_setfreq(&pdev->dev, 1);
  
  	ret = devm_request_irq(&pdev->dev, s3c_rtc_alarmno, s3c_rtc_alarmirq,
  			  0,  "s3c2410-rtc alarm", rtc);
  	if (ret) {
  		dev_err(&pdev->dev, "IRQ%d error %d
  ", s3c_rtc_alarmno, ret);
  		goto err_nortc;
  	}
  
  	ret = devm_request_irq(&pdev->dev, s3c_rtc_tickno, s3c_rtc_tickirq,
  			  0,  "s3c2410-rtc tick", rtc);
  	if (ret) {
  		dev_err(&pdev->dev, "IRQ%d error %d
  ", s3c_rtc_tickno, ret);
  		goto err_nortc;
  	}
  
  	clk_disable(rtc_clk);
  
  	return 0;
  
   err_nortc:
  	s3c_rtc_enable(pdev, 0);
  	clk_disable_unprepare(rtc_clk);
  
  	return ret;
  }
  
  #ifdef CONFIG_PM_SLEEP
  /* RTC Power management control */
  
  static int ticnt_save, ticnt_en_save;
  static bool wake_en;
  
  static int s3c_rtc_suspend(struct device *dev)
  {
  	struct platform_device *pdev = to_platform_device(dev);
  
  	clk_enable(rtc_clk);
  	/* save TICNT for anyone using periodic interrupts */
  	if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
  		ticnt_en_save = readw(s3c_rtc_base + S3C2410_RTCCON);
  		ticnt_en_save &= S3C64XX_RTCCON_TICEN;
  		ticnt_save = readl(s3c_rtc_base + S3C2410_TICNT);
  	} else {
  		ticnt_save = readb(s3c_rtc_base + S3C2410_TICNT);
  	}
  	s3c_rtc_enable(pdev, 0);
  
  	if (device_may_wakeup(dev) && !wake_en) {
  		if (enable_irq_wake(s3c_rtc_alarmno) == 0)
  			wake_en = true;
  		else
  			dev_err(dev, "enable_irq_wake failed
  ");
  	}
  	clk_disable(rtc_clk);
  
  	return 0;
  }
  
  static int s3c_rtc_resume(struct device *dev)
  {
  	struct platform_device *pdev = to_platform_device(dev);
  	unsigned int tmp;
  
  	clk_enable(rtc_clk);
  	s3c_rtc_enable(pdev, 1);
  	if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
  		writel(ticnt_save, s3c_rtc_base + S3C2410_TICNT);
  		if (ticnt_en_save) {
  			tmp = readw(s3c_rtc_base + S3C2410_RTCCON);
  			writew(tmp | ticnt_en_save,
  					s3c_rtc_base + S3C2410_RTCCON);
  		}
  	} else {
  		writeb(ticnt_save, s3c_rtc_base + S3C2410_TICNT);
  	}
  
  	if (device_may_wakeup(dev) && wake_en) {
  		disable_irq_wake(s3c_rtc_alarmno);
  		wake_en = false;
  	}
  	clk_disable(rtc_clk);
  
  	return 0;
  }
  #endif
  
  static SIMPLE_DEV_PM_OPS(s3c_rtc_pm_ops, s3c_rtc_suspend, s3c_rtc_resume);
  
  #ifdef CONFIG_OF
  static struct s3c_rtc_drv_data s3c_rtc_drv_data_array[] = {
  	[TYPE_S3C2410] = { TYPE_S3C2410 },
  	[TYPE_S3C2416] = { TYPE_S3C2416 },
  	[TYPE_S3C2443] = { TYPE_S3C2443 },
  	[TYPE_S3C64XX] = { TYPE_S3C64XX },
  };
  
  static const struct of_device_id s3c_rtc_dt_match[] = {
  	{
  		.compatible = "samsung,s3c2410-rtc",
  		.data = &s3c_rtc_drv_data_array[TYPE_S3C2410],
  	}, {
  		.compatible = "samsung,s3c2416-rtc",
  		.data = &s3c_rtc_drv_data_array[TYPE_S3C2416],
  	}, {
  		.compatible = "samsung,s3c2443-rtc",
  		.data = &s3c_rtc_drv_data_array[TYPE_S3C2443],
  	}, {
  		.compatible = "samsung,s3c6410-rtc",
  		.data = &s3c_rtc_drv_data_array[TYPE_S3C64XX],
  	},
  	{},
  };
  MODULE_DEVICE_TABLE(of, s3c_rtc_dt_match);
  #endif
  
  static struct platform_device_id s3c_rtc_driver_ids[] = {
  	{
  		.name		= "s3c2410-rtc",
  		.driver_data	= TYPE_S3C2410,
  	}, {
  		.name		= "s3c2416-rtc",
  		.driver_data	= TYPE_S3C2416,
  	}, {
  		.name		= "s3c2443-rtc",
  		.driver_data	= TYPE_S3C2443,
  	}, {
  		.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		= s3c_rtc_remove,
  	.id_table	= s3c_rtc_driver_ids,
  	.driver		= {
  		.name	= "s3c-rtc",
  		.owner	= THIS_MODULE,
  		.pm	= &s3c_rtc_pm_ops,
  		.of_match_table	= of_match_ptr(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");