watchdog: nowayout is bool
[linux-2.6.git] / drivers / rtc / rtc-s3c.c
index d6d1bff..c543f6f 100644 (file)
@@ -1,5 +1,8 @@
 /* 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/
 #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 <asm/hardware.h>
+#include <mach/hardware.h>
 #include <asm/uaccess.h>
 #include <asm/io.h>
 #include <asm/irq.h>
-#include <asm/rtc.h>
-
-#include <asm/mach/time.h>
+#include <plat/regs-rtc.h>
 
-#include <asm/arch/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 int s3c_rtc_freq    = 1;
+static bool wake_en;
+static enum s3c_cpu_type s3c_rtc_cpu_type;
 
 static DEFINE_SPINLOCK(s3c_rtc_pie_lock);
-static unsigned int tick_count;
+
+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 pt_regs *r)
+static irqreturn_t s3c_rtc_alarmirq(int irq, void *id)
 {
        struct rtc_device *rdev = id;
 
-       rtc_update_irq(&rdev->class_dev, 1, RTC_AF | RTC_IRQF);
+       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 pt_regs *r)
+static irqreturn_t s3c_rtc_tickirq(int irq, void *id)
 {
        struct rtc_device *rdev = id;
 
-       rtc_update_irq(&rdev->class_dev, tick_count++, RTC_PF | RTC_IRQF);
+       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 void s3c_rtc_setaie(int to)
+static int s3c_rtc_setaie(struct device *dev, unsigned int enabled)
 {
        unsigned int tmp;
 
-       pr_debug("%s: aie=%d\n", __FUNCTION__, to);
+       pr_debug("%s: aie=%d\n", __func__, enabled);
 
-       tmp = readb(S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;
+       clk_enable(rtc_clk);
+       tmp = readb(s3c_rtc_base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;
 
-       if (to)
+       if (enabled)
                tmp |= S3C2410_RTCALM_ALMEN;
 
-       writeb(tmp, S3C2410_RTCALM);
-}
-
-static void s3c_rtc_setpie(int to)
-{
-       unsigned int tmp;
+       writeb(tmp, s3c_rtc_base + S3C2410_RTCALM);
+       clk_disable(rtc_clk);
 
-       pr_debug("%s: pie=%d\n", __FUNCTION__, to);
+       s3c_rtc_alarm_clk_enable(enabled);
 
-       spin_lock_irq(&s3c_rtc_pie_lock);
-       tmp = readb(S3C2410_TICNT) & ~S3C2410_TICNT_ENABLE;
-
-       if (to)
-               tmp |= S3C2410_TICNT_ENABLE;
-
-       writeb(tmp, S3C2410_TICNT);
-       spin_unlock_irq(&s3c_rtc_pie_lock);
+       return 0;
 }
 
-static void s3c_rtc_setfreq(int freq)
+static int s3c_rtc_setfreq(struct device *dev, int freq)
 {
-       unsigned int tmp;
+       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);
-       tmp = readb(S3C2410_TICNT) & S3C2410_TICNT_ENABLE;
 
-       s3c_rtc_freq = freq;
+       if (s3c_rtc_cpu_type == TYPE_S3C2410) {
+               tmp = readb(s3c_rtc_base + S3C2410_TICNT);
+               tmp &= S3C2410_TICNT_ENABLE;
+       }
 
-       tmp |= (128 / freq)-1;
+       tmp |= (rtc_dev->max_user_freq / freq)-1;
 
-       writeb(tmp, S3C2410_TICNT);
+       writel(tmp, s3c_rtc_base + S3C2410_TICNT);
        spin_unlock_irq(&s3c_rtc_pie_lock);
+       clk_disable(rtc_clk);
+
+       return 0;
 }
 
 /* Time read/write */
@@ -113,14 +158,16 @@ static void s3c_rtc_setfreq(int freq)
 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(S3C2410_RTCMIN);
-       rtc_tm->tm_hour = readb(S3C2410_RTCHOUR);
-       rtc_tm->tm_mday = readb(S3C2410_RTCDATE);
-       rtc_tm->tm_mon  = readb(S3C2410_RTCMON);
-       rtc_tm->tm_year = readb(S3C2410_RTCYEAR);
-       rtc_tm->tm_sec  = readb(S3C2410_RTCSEC);
+       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
@@ -132,36 +179,49 @@ static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
                goto retry_get_time;
        }
 
-       pr_debug("read time %02x.%02x.%02x %02x/%02x/%02x\n",
-                rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday,
-                rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);
-
-       BCD_TO_BIN(rtc_tm->tm_sec);
-       BCD_TO_BIN(rtc_tm->tm_min);
-       BCD_TO_BIN(rtc_tm->tm_hour);
-       BCD_TO_BIN(rtc_tm->tm_mday);
-       BCD_TO_BIN(rtc_tm->tm_mon);
-       BCD_TO_BIN(rtc_tm->tm_year);
+       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\n",
+                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;
 
-       return 0;
+       clk_disable(rtc_clk);
+       return rtc_valid_tm(rtc_tm);
 }
 
 static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
 {
-       /* the rtc gets round the y2k problem by just not supporting it */
+       void __iomem *base = s3c_rtc_base;
+       int year = tm->tm_year - 100;
 
-       if (tm->tm_year < 100)
+       pr_debug("set time %04d.%02d.%02d %02d:%02d:%02d\n",
+                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\n");
                return -EINVAL;
+       }
 
-       writeb(BIN2BCD(tm->tm_sec),  S3C2410_RTCSEC);
-       writeb(BIN2BCD(tm->tm_min),  S3C2410_RTCMIN);
-       writeb(BIN2BCD(tm->tm_hour), S3C2410_RTCHOUR);
-       writeb(BIN2BCD(tm->tm_mday), S3C2410_RTCDATE);
-       writeb(BIN2BCD(tm->tm_mon + 1), S3C2410_RTCMON);
-       writeb(BIN2BCD(tm->tm_year - 100), S3C2410_RTCYEAR);
+       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;
 }
@@ -169,270 +229,197 @@ static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
 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;
 
-       alm_tm->tm_sec  = readb(S3C2410_ALMSEC);
-       alm_tm->tm_min  = readb(S3C2410_ALMMIN);
-       alm_tm->tm_hour = readb(S3C2410_ALMHOUR);
-       alm_tm->tm_mon  = readb(S3C2410_ALMMON);
-       alm_tm->tm_mday = readb(S3C2410_ALMDATE);
-       alm_tm->tm_year = readb(S3C2410_ALMYEAR);
+       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(S3C2410_RTCALM);
+       alm_en = readb(base + S3C2410_RTCALM);
 
-       pr_debug("read alarm %02x %02x.%02x.%02x %02x/%02x/%02x\n",
+       alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0;
+
+       pr_debug("read alarm %d, %04d.%02d.%02d %02d:%02d:%02d\n",
                 alm_en,
-                alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday,
+                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)
-               BCD_TO_BIN(alm_tm->tm_sec);
+               alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec);
        else
-               alm_tm->tm_sec = 0xff;
+               alm_tm->tm_sec = -1;
 
        if (alm_en & S3C2410_RTCALM_MINEN)
-               BCD_TO_BIN(alm_tm->tm_min);
+               alm_tm->tm_min = bcd2bin(alm_tm->tm_min);
        else
-               alm_tm->tm_min = 0xff;
+               alm_tm->tm_min = -1;
 
        if (alm_en & S3C2410_RTCALM_HOUREN)
-               BCD_TO_BIN(alm_tm->tm_hour);
+               alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour);
        else
-               alm_tm->tm_hour = 0xff;
+               alm_tm->tm_hour = -1;
 
        if (alm_en & S3C2410_RTCALM_DAYEN)
-               BCD_TO_BIN(alm_tm->tm_mday);
+               alm_tm->tm_mday = bcd2bin(alm_tm->tm_mday);
        else
-               alm_tm->tm_mday = 0xff;
+               alm_tm->tm_mday = -1;
 
        if (alm_en & S3C2410_RTCALM_MONEN) {
-               BCD_TO_BIN(alm_tm->tm_mon);
+               alm_tm->tm_mon = bcd2bin(alm_tm->tm_mon);
                alm_tm->tm_mon -= 1;
        } else {
-               alm_tm->tm_mon = 0xff;
+               alm_tm->tm_mon = -1;
        }
 
        if (alm_en & S3C2410_RTCALM_YEAREN)
-               BCD_TO_BIN(alm_tm->tm_year);
+               alm_tm->tm_year = bcd2bin(alm_tm->tm_year);
        else
-               alm_tm->tm_year = 0xffff;
+               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;
 
-       pr_debug("s3c_rtc_setalarm: %d, %02x/%02x/%02x %02x.%02x.%02x\n",
+       clk_enable(rtc_clk);
+       pr_debug("s3c_rtc_setalarm: %d, %04d.%02d.%02d %02d:%02d:%02d\n",
                 alrm->enabled,
-                tm->tm_mday & 0xff, tm->tm_mon & 0xff, tm->tm_year & 0xff,
-                tm->tm_hour & 0xff, tm->tm_min & 0xff, tm->tm_sec);
-
+                1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday,
+                tm->tm_hour, tm->tm_min, tm->tm_sec);
 
-       alrm_en = readb(S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
-       writeb(0x00, S3C2410_RTCALM);
+       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), S3C2410_ALMSEC);
+               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), S3C2410_ALMMIN);
+               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), S3C2410_ALMHOUR);
+               writeb(bin2bcd(tm->tm_hour), base + S3C2410_ALMHOUR);
        }
 
        pr_debug("setting S3C2410_RTCALM to %08x\n", alrm_en);
 
-       writeb(alrm_en, S3C2410_RTCALM);
+       writeb(alrm_en, base + S3C2410_RTCALM);
 
-       if (0) {
-               alrm_en = readb(S3C2410_RTCALM);
-               alrm_en &= ~S3C2410_RTCALM_ALMEN;
-               writeb(alrm_en, S3C2410_RTCALM);
-               disable_irq_wake(s3c_rtc_alarmno);
-       }
-
-       if (alrm->enabled)
-               enable_irq_wake(s3c_rtc_alarmno);
-       else
-               disable_irq_wake(s3c_rtc_alarmno);
+       s3c_rtc_setaie(dev, alrm->enabled);
 
+       clk_disable(rtc_clk);
        return 0;
 }
 
-static int s3c_rtc_ioctl(struct device *dev,
-                        unsigned int cmd, unsigned long arg)
-{
-       unsigned int ret = -ENOIOCTLCMD;
-
-       switch (cmd) {
-       case RTC_AIE_OFF:
-       case RTC_AIE_ON:
-               s3c_rtc_setaie((cmd == RTC_AIE_ON) ? 1 : 0);
-               ret = 0;
-               break;
-
-       case RTC_PIE_OFF:
-       case RTC_PIE_ON:
-               tick_count = 0;
-               s3c_rtc_setpie((cmd == RTC_PIE_ON) ? 1 : 0);
-               ret = 0;
-               break;
-
-       case RTC_IRQP_READ:
-               ret = put_user(s3c_rtc_freq, (unsigned long __user *)arg);
-               break;
-
-       case RTC_IRQP_SET:
-               /* check for power of 2 */
-
-               if ((arg & (arg-1)) != 0 || arg < 1) {
-                       ret = -EINVAL;
-                       goto exit;
-               }
-
-               pr_debug("s3c2410_rtc: setting frequency %ld\n", arg);
-
-               s3c_rtc_setfreq(arg);
-               ret = 0;
-               break;
-
-       case RTC_UIE_ON:
-       case RTC_UIE_OFF:
-               ret = -EINVAL;
-       }
-
- exit:
-       return ret;
-}
-
 static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
 {
-       unsigned int rtcalm = readb(S3C2410_RTCALM);
-       unsigned int ticnt = readb (S3C2410_TICNT);
-
-       seq_printf(seq, "alarm_IRQ\t: %s\n",
-                  (rtcalm & S3C2410_RTCALM_ALMEN) ? "yes" : "no" );
-
-       seq_printf(seq, "periodic_IRQ\t: %s\n",
-                    (ticnt & S3C2410_TICNT_ENABLE) ? "yes" : "no" );
-
-       seq_printf(seq, "periodic_freq\t: %d\n", s3c_rtc_freq);
+       unsigned int ticnt;
 
-       return 0;
-}
-
-static int s3c_rtc_open(struct device *dev)
-{
-       struct platform_device *pdev = to_platform_device(dev);
-       struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
-       int ret;
-
-       ret = request_irq(s3c_rtc_alarmno, s3c_rtc_alarmirq,
-                         SA_INTERRUPT,  "s3c2410-rtc alarm", rtc_dev);
-
-       if (ret) {
-               dev_err(dev, "IRQ%d error %d\n", s3c_rtc_alarmno, ret);
-               return ret;
-       }
-
-       ret = request_irq(s3c_rtc_tickno, s3c_rtc_tickirq,
-                         SA_INTERRUPT,  "s3c2410-rtc tick", rtc_dev);
-
-       if (ret) {
-               dev_err(dev, "IRQ%d error %d\n", s3c_rtc_tickno, ret);
-               goto tick_err;
+       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;
        }
 
-       return ret;
-
- tick_err:
-       free_irq(s3c_rtc_alarmno, rtc_dev);
-       return ret;
-}
-
-static void s3c_rtc_release(struct device *dev)
-{
-       struct platform_device *pdev = to_platform_device(dev);
-       struct rtc_device *rtc_dev = platform_get_drvdata(pdev);
-
-       /* do not clear AIE here, it may be needed for wake */
-
-       s3c_rtc_setpie(0);
-       free_irq(s3c_rtc_alarmno, rtc_dev);
-       free_irq(s3c_rtc_tickno, rtc_dev);
+       seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt  ? "yes" : "no");
+       clk_disable(rtc_clk);
+       return 0;
 }
 
-static struct rtc_class_ops s3c_rtcops = {
-       .open           = s3c_rtc_open,
-       .release        = s3c_rtc_release,
-       .ioctl          = s3c_rtc_ioctl,
+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,
+       .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 = readb(S3C2410_RTCCON);
-               writeb(tmp & ~S3C2410_RTCCON_RTCEN, S3C2410_RTCCON);
-
-               tmp = readb(S3C2410_TICNT);
-               writeb(tmp & ~S3C2410_TICNT_ENABLE, S3C2410_TICNT);
+               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 ((readb(S3C2410_RTCCON) & S3C2410_RTCCON_RTCEN) == 0){
+               if ((readw(base+S3C2410_RTCCON) & S3C2410_RTCCON_RTCEN) == 0) {
                        dev_info(&pdev->dev, "rtc disabled, re-enabling\n");
 
-                       tmp = readb(S3C2410_RTCCON);
-                       writeb(tmp | S3C2410_RTCCON_RTCEN , S3C2410_RTCCON);
+                       tmp = readw(base + S3C2410_RTCCON);
+                       writew(tmp | S3C2410_RTCCON_RTCEN,
+                               base + S3C2410_RTCCON);
                }
 
-               if ((readb(S3C2410_RTCCON) & S3C2410_RTCCON_CNTSEL)){
+               if ((readw(base + S3C2410_RTCCON) & S3C2410_RTCCON_CNTSEL)) {
                        dev_info(&pdev->dev, "removing RTCCON_CNTSEL\n");
 
-                       tmp = readb(S3C2410_RTCCON);
-                       writeb(tmp& ~S3C2410_RTCCON_CNTSEL , S3C2410_RTCCON);
+                       tmp = readw(base + S3C2410_RTCCON);
+                       writew(tmp & ~S3C2410_RTCCON_CNTSEL,
+                               base + S3C2410_RTCCON);
                }
 
-               if ((readb(S3C2410_RTCCON) & S3C2410_RTCCON_CLKRST)){
+               if ((readw(base + S3C2410_RTCCON) & S3C2410_RTCCON_CLKRST)) {
                        dev_info(&pdev->dev, "removing RTCCON_CLKRST\n");
 
-                       tmp = readb(S3C2410_RTCCON);
-                       writeb(tmp & ~S3C2410_RTCCON_CLKRST, S3C2410_RTCCON);
+                       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)
+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_setpie(0);
-       s3c_rtc_setaie(0);
+       s3c_rtc_setaie(&dev->dev, 0);
+
+       clk_put(rtc_clk);
+       rtc_clk = NULL;
 
        iounmap(s3c_rtc_base);
        release_resource(s3c_rtc_mem);
@@ -441,13 +428,14 @@ static int s3c_rtc_remove(struct platform_device *dev)
        return 0;
 }
 
-static int s3c_rtc_probe(struct platform_device *pdev)
+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\n", __FUNCTION__, pdev);
+       pr_debug("%s: probe=%p\n", __func__, pdev);
 
        /* find the IRQs */
 
@@ -474,9 +462,8 @@ static int s3c_rtc_probe(struct platform_device *pdev)
                return -ENOENT;
        }
 
-       s3c_rtc_mem = request_mem_region(res->start,
-                                            res->end-res->start+1,
-                                            pdev->name);
+       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\n");
@@ -484,20 +471,31 @@ static int s3c_rtc_probe(struct platform_device *pdev)
                goto err_nores;
        }
 
-       s3c_rtc_base = ioremap(res->start, res->end - res->start + 1);
+       s3c_rtc_base = ioremap(res->start, resource_size(res));
        if (s3c_rtc_base == NULL) {
                dev_err(&pdev->dev, "failed ioremap()\n");
                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\n");
+               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\n", readb(S3C2410_RTCCON));
+       pr_debug("s3c2410_rtc: RTCCON=%02x\n",
+                readw(s3c_rtc_base + S3C2410_RTCCON));
 
-       s3c_rtc_setfreq(s3c_rtc_freq);
+       device_init_wakeup(&pdev->dev, 1);
 
        /* register RTC and exit */
 
@@ -510,13 +508,72 @@ static int s3c_rtc_probe(struct platform_device *pdev)
                goto err_nortc;
        }
 
-       rtc->max_user_freq = 128;
+#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\n");
+       }
+
+       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,
+                         0,  "s3c2410-rtc alarm", rtc);
+       if (ret) {
+               dev_err(&pdev->dev, "IRQ%d error %d\n", s3c_rtc_alarmno, ret);
+               goto err_alarm_irq;
+       }
+
+       ret = request_irq(s3c_rtc_tickno, s3c_rtc_tickirq,
+                         0,  "s3c2410-rtc tick", rtc);
+       if (ret) {
+               dev_err(&pdev->dev, "IRQ%d error %d\n", 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:
@@ -530,44 +587,48 @@ static int s3c_rtc_probe(struct platform_device *pdev)
 
 /* RTC Power management control */
 
-static struct timespec s3c_rtc_delta;
-
-static int ticnt_save;
+static int ticnt_save, ticnt_en_save;
 
 static int s3c_rtc_suspend(struct platform_device *pdev, pm_message_t state)
 {
-       struct rtc_time tm;
-       struct timespec time;
-
-       time.tv_nsec = 0;
-
+       clk_enable(rtc_clk);
        /* save TICNT for anyone using periodic interrupts */
-
-       ticnt_save = readb(S3C2410_TICNT);
-
-       /* calculate time delta for suspend */
-
-       s3c_rtc_gettime(&pdev->dev, &tm);
-       rtc_tm_to_time(&tm, &time.tv_sec);
-       save_time_delta(&s3c_rtc_delta, &time);
+       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\n");
+       }
+       clk_disable(rtc_clk);
+
        return 0;
 }
 
 static int s3c_rtc_resume(struct platform_device *pdev)
 {
-       struct rtc_time tm;
-       struct timespec time;
-
-       time.tv_nsec = 0;
+       unsigned int tmp;
 
+       clk_enable(rtc_clk);
        s3c_rtc_enable(pdev, 1);
-       s3c_rtc_gettime(&pdev->dev, &tm);
-       rtc_tm_to_time(&tm, &time.tv_sec);
-       restore_time_delta(&s3c_rtc_delta, &time);
+       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);
 
-       writeb(ticnt_save, S3C2410_TICNT);
        return 0;
 }
 #else
@@ -575,33 +636,46 @@ static int s3c_rtc_resume(struct platform_device *pdev)
 #define s3c_rtc_resume  NULL
 #endif
 
-static struct platform_driver s3c2410_rtcdrv = {
+#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         = s3c_rtc_remove,
+       .remove         = __devexit_p(s3c_rtc_remove),
        .suspend        = s3c_rtc_suspend,
        .resume         = s3c_rtc_resume,
+       .id_table       = s3c_rtc_driver_ids,
        .driver         = {
-               .name   = "s3c2410-rtc",
+               .name   = "s3c-rtc",
                .owner  = THIS_MODULE,
+               .of_match_table = s3c_rtc_dt_match,
        },
 };
 
-static char __initdata banner[] = "S3C24XX RTC, (c) 2004,2006 Simtec Electronics\n";
-
-static int __init s3c_rtc_init(void)
-{
-       printk(banner);
-       return platform_driver_register(&s3c2410_rtcdrv);
-}
-
-static void __exit s3c_rtc_exit(void)
-{
-       platform_driver_unregister(&s3c2410_rtcdrv);
-}
-
-module_init(s3c_rtc_init);
-module_exit(s3c_rtc_exit);
+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");