drivers/rtc/rtc-s3c.c: delete duplicate clock control

The current functions in s3c-rtc driver execute clk_enable/disable() to
control clocks and some functions execute s3c_rtc_alarm_clk_enable()
unnecessarily.  So this patch deletes the duplicate clock control and
spilts s3c_rtc_alarm_clk_enable() out as
s3c_rtc_enable_clk()/s3c_rtc_disable_clk() to improve readability.

Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Kukjin Kim <kgene@kernel.org>
Cc: Inki Dae <inki.dae@samsung.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 39 insertions, 124 deletions

diff --git a/drivers/rtc/rtc-s3c.c b/drivers/rtc/rtc-s3c.c
index f4cf6851fae9..fb0c569765c6 100644
--- a/drivers/rtc/rtc-s3c.c
+++ b/drivers/rtc/rtc-s3c.c
@@ -39,7 +39,6 @@ struct s3c_rtc {
         void __iomem *base;
         struct clk *rtc_clk;
         struct clk *rtc_src_clk;
-        bool enabled;
 
         struct s3c_rtc_data *data;
 
@@ -67,26 +66,25 @@ struct s3c_rtc_data {
         void (*disable) (struct s3c_rtc *info);
 };
 
-static void s3c_rtc_alarm_clk_enable(struct s3c_rtc *info, bool enable)
+static void s3c_rtc_enable_clk(struct s3c_rtc *info)
 {
         unsigned long irq_flags;
 
         spin_lock_irqsave(&info->alarm_clk_lock, irq_flags);
-        if (enable) {
-                if (!info->enabled) {
-                        clk_enable(info->rtc_clk);
-                        if (info->data->needs_src_clk)
-                                clk_enable(info->rtc_src_clk);
-                        info->enabled = true;
-                }
-        } else {
-                if (info->enabled) {
-                        if (info->data->needs_src_clk)
-                                clk_disable(info->rtc_src_clk);
-                        clk_disable(info->rtc_clk);
-                        info->enabled = false;
-                }
-        }
+        clk_enable(info->rtc_clk);
+        if (info->data->needs_src_clk)
+                clk_enable(info->rtc_src_clk);
+        spin_unlock_irqrestore(&info->alarm_clk_lock, irq_flags);
+}
+
+static void s3c_rtc_disable_clk(struct s3c_rtc *info)
+{
+        unsigned long irq_flags;
+
+        spin_lock_irqsave(&info->alarm_clk_lock, irq_flags);
+        if (info->data->needs_src_clk)
+                clk_disable(info->rtc_src_clk);
+        clk_disable(info->rtc_clk);
         spin_unlock_irqrestore(&info->alarm_clk_lock, irq_flags);
 }
 
@@ -119,20 +117,16 @@ static int s3c_rtc_setaie(struct device *dev, unsigned int enabled)
 
         dev_dbg(info->dev, "%s: aie=%d\n", __func__, enabled);
 
-        clk_enable(info->rtc_clk);
-        if (info->data->needs_src_clk)
-                clk_enable(info->rtc_src_clk);
+        s3c_rtc_enable_clk(info);
+
         tmp = readb(info->base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;
 
         if (enabled)
                 tmp |= S3C2410_RTCALM_ALMEN;
 
         writeb(tmp, info->base + S3C2410_RTCALM);
-        if (info->data->needs_src_clk)
-                clk_disable(info->rtc_src_clk);
-        clk_disable(info->rtc_clk);
 
-        s3c_rtc_alarm_clk_enable(info, enabled);
+        s3c_rtc_disable_clk(info);
 
         return 0;
 }
@@ -143,18 +137,12 @@ static int s3c_rtc_setfreq(struct s3c_rtc *info, int freq)
         if (!is_power_of_2(freq))
                 return -EINVAL;
 
-        clk_enable(info->rtc_clk);
-        if (info->data->needs_src_clk)
-                clk_enable(info->rtc_src_clk);
         spin_lock_irq(&info->pie_lock);
 
         if (info->data->set_freq)
                 info->data->set_freq(info, freq);
 
         spin_unlock_irq(&info->pie_lock);
-        if (info->data->needs_src_clk)
-                clk_disable(info->rtc_src_clk);
-        clk_disable(info->rtc_clk);
 
         return 0;
 }
@@ -165,9 +153,7 @@ static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
         struct s3c_rtc *info = dev_get_drvdata(dev);
         unsigned int have_retried = 0;
 
-        clk_enable(info->rtc_clk);
-        if (info->data->needs_src_clk)
-                clk_enable(info->rtc_src_clk);
+        s3c_rtc_enable_clk(info);
 
  retry_get_time:
         rtc_tm->tm_min  = readb(info->base + S3C2410_RTCMIN);
@@ -194,6 +180,8 @@ static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
         rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon);
         rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year);
 
+        s3c_rtc_disable_clk(info);
+
         rtc_tm->tm_year += 100;
 
         dev_dbg(dev, "read time %04d.%02d.%02d %02d:%02d:%02d\n",
@@ -202,10 +190,6 @@ static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
 
         rtc_tm->tm_mon -= 1;
 
-        if (info->data->needs_src_clk)
-                clk_disable(info->rtc_src_clk);
-        clk_disable(info->rtc_clk);
-
         return rtc_valid_tm(rtc_tm);
 }
 
@@ -225,9 +209,7 @@ static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
                 return -EINVAL;
         }
 
-        clk_enable(info->rtc_clk);
-        if (info->data->needs_src_clk)
-                clk_enable(info->rtc_src_clk);
+        s3c_rtc_enable_clk(info);
 
         writeb(bin2bcd(tm->tm_sec),  info->base + S3C2410_RTCSEC);
         writeb(bin2bcd(tm->tm_min),  info->base + S3C2410_RTCMIN);
@@ -236,9 +218,7 @@ static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
         writeb(bin2bcd(tm->tm_mon + 1), info->base + S3C2410_RTCMON);
         writeb(bin2bcd(year), info->base + S3C2410_RTCYEAR);
 
-        if (info->data->needs_src_clk)
-                clk_disable(info->rtc_src_clk);
-        clk_disable(info->rtc_clk);
+        s3c_rtc_disable_clk(info);
 
         return 0;
 }
@@ -249,9 +229,7 @@ static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
         struct rtc_time *alm_tm = &alrm->time;
         unsigned int alm_en;
 
-        clk_enable(info->rtc_clk);
-        if (info->data->needs_src_clk)
-                clk_enable(info->rtc_src_clk);
+        s3c_rtc_enable_clk(info);
 
         alm_tm->tm_sec  = readb(info->base + S3C2410_ALMSEC);
         alm_tm->tm_min  = readb(info->base + S3C2410_ALMMIN);
@@ -262,6 +240,8 @@ static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
 
         alm_en = readb(info->base + S3C2410_RTCALM);
 
+        s3c_rtc_disable_clk(info);
+
         alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0;
 
         dev_dbg(dev, "read alarm %d, %04d.%02d.%02d %02d:%02d:%02d\n",
@@ -269,9 +249,7 @@ static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
                  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
@@ -304,10 +282,6 @@ static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
         else
                 alm_tm->tm_year = -1;
 
-        if (info->data->needs_src_clk)
-                clk_disable(info->rtc_src_clk);
-        clk_disable(info->rtc_clk);
-
         return 0;
 }
 
@@ -317,15 +291,13 @@ static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
         struct rtc_time *tm = &alrm->time;
         unsigned int alrm_en;
 
-        clk_enable(info->rtc_clk);
-        if (info->data->needs_src_clk)
-                clk_enable(info->rtc_src_clk);
-
         dev_dbg(dev, "s3c_rtc_setalarm: %d, %04d.%02d.%02d %02d:%02d:%02d\n",
                  alrm->enabled,
                  1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday,
                  tm->tm_hour, tm->tm_min, tm->tm_sec);
 
+        s3c_rtc_enable_clk(info);
+
         alrm_en = readb(info->base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
         writeb(0x00, info->base + S3C2410_RTCALM);
 
@@ -348,11 +320,9 @@ static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
 
         writeb(alrm_en, info->base + S3C2410_RTCALM);
 
-        s3c_rtc_setaie(dev, alrm->enabled);
+        s3c_rtc_disable_clk(info);
 
-        if (info->data->needs_src_clk)
-                clk_disable(info->rtc_src_clk);
-        clk_disable(info->rtc_clk);
+        s3c_rtc_setaie(dev, alrm->enabled);
 
         return 0;
 }
@@ -361,16 +331,12 @@ static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
 {
         struct s3c_rtc *info = dev_get_drvdata(dev);
 
-        clk_enable(info->rtc_clk);
-        if (info->data->needs_src_clk)
-                clk_enable(info->rtc_src_clk);
+        s3c_rtc_enable_clk(info);
 
         if (info->data->enable_tick)
                 info->data->enable_tick(info, seq);
 
-        if (info->data->needs_src_clk)
-                clk_disable(info->rtc_src_clk);
-        clk_disable(info->rtc_clk);
+        s3c_rtc_disable_clk(info);
 
         return 0;
 }
@@ -388,10 +354,6 @@ static void s3c24xx_rtc_enable(struct s3c_rtc *info)
 {
         unsigned int con, tmp;
 
-        clk_enable(info->rtc_clk);
-        if (info->data->needs_src_clk)
-                clk_enable(info->rtc_src_clk);
-
         con = readw(info->base + S3C2410_RTCCON);
         /* re-enable the device, and check it is ok */
         if ((con & S3C2410_RTCCON_RTCEN) == 0) {
@@ -417,20 +379,12 @@ static void s3c24xx_rtc_enable(struct s3c_rtc *info)
                 writew(tmp & ~S3C2410_RTCCON_CLKRST,
                         info->base + S3C2410_RTCCON);
         }
-
-        if (info->data->needs_src_clk)
-                clk_disable(info->rtc_src_clk);
-        clk_disable(info->rtc_clk);
 }
 
 static void s3c24xx_rtc_disable(struct s3c_rtc *info)
 {
         unsigned int con;
 
-        clk_enable(info->rtc_clk);
-        if (info->data->needs_src_clk)
-                clk_enable(info->rtc_src_clk);
-
         con = readw(info->base + S3C2410_RTCCON);
         con &= ~S3C2410_RTCCON_RTCEN;
         writew(con, info->base + S3C2410_RTCCON);
@@ -438,28 +392,16 @@ static void s3c24xx_rtc_disable(struct s3c_rtc *info)
         con = readb(info->base + S3C2410_TICNT);
         con &= ~S3C2410_TICNT_ENABLE;
         writeb(con, info->base + S3C2410_TICNT);
-
-        if (info->data->needs_src_clk)
-                clk_disable(info->rtc_src_clk);
-        clk_disable(info->rtc_clk);
 }
 
 static void s3c6410_rtc_disable(struct s3c_rtc *info)
 {
         unsigned int con;
 
-        clk_enable(info->rtc_clk);
-        if (info->data->needs_src_clk)
-                clk_enable(info->rtc_src_clk);
-
         con = readw(info->base + S3C2410_RTCCON);
         con &= ~S3C64XX_RTCCON_TICEN;
         con &= ~S3C2410_RTCCON_RTCEN;
         writew(con, info->base + S3C2410_RTCCON);
-
-        if (info->data->needs_src_clk)
-                clk_disable(info->rtc_src_clk);
-        clk_disable(info->rtc_clk);
 }
 
 static int s3c_rtc_remove(struct platform_device *pdev)
@@ -598,15 +540,16 @@ static int s3c_rtc_probe(struct platform_device *pdev)
 
         s3c_rtc_setfreq(info, 1);
 
-        if (info->data->needs_src_clk)
-                clk_disable(info->rtc_src_clk);
-        clk_disable(info->rtc_clk);
+        s3c_rtc_disable_clk(info);
 
         return 0;
 
  err_nortc:
         if (info->data->disable)
                 info->data->disable(info);
+
+        if (info->data->needs_src_clk)
+                clk_disable_unprepare(info->rtc_src_clk);
         clk_disable_unprepare(info->rtc_clk);
 
         return ret;
@@ -618,9 +561,7 @@ static int s3c_rtc_suspend(struct device *dev)
 {
         struct s3c_rtc *info = dev_get_drvdata(dev);
 
-        clk_enable(info->rtc_clk);
-        if (info->data->needs_src_clk)
-                clk_enable(info->rtc_src_clk);
+        s3c_rtc_enable_clk(info);
 
         /* save TICNT for anyone using periodic interrupts */
         if (info->data->save_tick_cnt)
@@ -636,10 +577,6 @@ static int s3c_rtc_suspend(struct device *dev)
                         dev_err(dev, "enable_irq_wake failed\n");
         }
 
-        if (info->data->needs_src_clk)
-                clk_disable(info->rtc_src_clk);
-        clk_disable(info->rtc_clk);
-
         return 0;
 }
 
@@ -647,25 +584,19 @@ static int s3c_rtc_resume(struct device *dev)
 {
         struct s3c_rtc *info = dev_get_drvdata(dev);
 
-        clk_enable(info->rtc_clk);
-        if (info->data->needs_src_clk)
-                clk_enable(info->rtc_src_clk);
-
         if (info->data->enable)
                 info->data->enable(info);
 
         if (info->data->restore_tick_cnt)
                 info->data->restore_tick_cnt(info);
 
+        s3c_rtc_disable_clk(info);
+
         if (device_may_wakeup(dev) && info->wake_en) {
                 disable_irq_wake(info->irq_alarm);
                 info->wake_en = false;
         }
 
-        if (info->data->needs_src_clk)
-                clk_disable(info->rtc_src_clk);
-        clk_disable(info->rtc_clk);
-
         return 0;
 }
 #endif
@@ -673,29 +604,13 @@ static SIMPLE_DEV_PM_OPS(s3c_rtc_pm_ops, s3c_rtc_suspend, s3c_rtc_resume);
 
 static void s3c24xx_rtc_irq(struct s3c_rtc *info, int mask)
 {
-        clk_enable(info->rtc_clk);
-        if (info->data->needs_src_clk)
-                clk_enable(info->rtc_src_clk);
         rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF);
-        if (info->data->needs_src_clk)
-                clk_disable(info->rtc_src_clk);
-        clk_disable(info->rtc_clk);
-
-        s3c_rtc_alarm_clk_enable(info, false);
 }
 
 static void s3c6410_rtc_irq(struct s3c_rtc *info, int mask)
 {
-        clk_enable(info->rtc_clk);
-        if (info->data->needs_src_clk)
-                clk_enable(info->rtc_src_clk);
         rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF);
         writeb(mask, info->base + S3C2410_INTP);
-        if (info->data->needs_src_clk)
-                clk_disable(info->rtc_src_clk);
-        clk_disable(info->rtc_clk);
-
-        s3c_rtc_alarm_clk_enable(info, false);
 }
 
 static void s3c2410_rtc_setfreq(struct s3c_rtc *info, int freq)