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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 08:19:28 +00:00
drivers/rtc/rtc-s3c.c: support clock gating
Add support for clock gating. Power consumption can be reduced by setting rtc_clk disabled state except for when RTC related registers are accessed. Signed-off-by: Donggeun Kim <dg77.kim@samsung.com> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com> Signed-off-by: KyungMin Park <kyungmin.park@samsung.com> Cc: Alessandro Zummo <a.zummo@towertech.it> Cc: Ben Dooks <ben@fluff.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
parent
955dbea3c7
commit
cefe4fbbaa
1 changed files with 26 additions and 1 deletions
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@ -57,11 +57,13 @@ static irqreturn_t s3c_rtc_alarmirq(int irq, void *id)
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{
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{
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struct rtc_device *rdev = id;
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struct rtc_device *rdev = id;
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clk_enable(rtc_clk);
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rtc_update_irq(rdev, 1, RTC_AF | RTC_IRQF);
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rtc_update_irq(rdev, 1, RTC_AF | RTC_IRQF);
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if (s3c_rtc_cpu_type == TYPE_S3C64XX)
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if (s3c_rtc_cpu_type == TYPE_S3C64XX)
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writeb(S3C2410_INTP_ALM, s3c_rtc_base + S3C2410_INTP);
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writeb(S3C2410_INTP_ALM, s3c_rtc_base + S3C2410_INTP);
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clk_disable(rtc_clk);
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return IRQ_HANDLED;
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return IRQ_HANDLED;
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}
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}
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@ -69,11 +71,13 @@ static irqreturn_t s3c_rtc_tickirq(int irq, void *id)
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{
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{
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struct rtc_device *rdev = id;
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struct rtc_device *rdev = id;
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clk_enable(rtc_clk);
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rtc_update_irq(rdev, 1, RTC_PF | RTC_IRQF);
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rtc_update_irq(rdev, 1, RTC_PF | RTC_IRQF);
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if (s3c_rtc_cpu_type == TYPE_S3C64XX)
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if (s3c_rtc_cpu_type == TYPE_S3C64XX)
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writeb(S3C2410_INTP_TIC, s3c_rtc_base + S3C2410_INTP);
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writeb(S3C2410_INTP_TIC, s3c_rtc_base + S3C2410_INTP);
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clk_disable(rtc_clk);
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return IRQ_HANDLED;
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return IRQ_HANDLED;
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}
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}
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@ -84,12 +88,14 @@ static int s3c_rtc_setaie(struct device *dev, unsigned int enabled)
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pr_debug("%s: aie=%d\n", __func__, enabled);
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pr_debug("%s: aie=%d\n", __func__, enabled);
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clk_enable(rtc_clk);
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tmp = readb(s3c_rtc_base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;
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tmp = readb(s3c_rtc_base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;
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if (enabled)
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if (enabled)
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tmp |= S3C2410_RTCALM_ALMEN;
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tmp |= S3C2410_RTCALM_ALMEN;
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writeb(tmp, s3c_rtc_base + S3C2410_RTCALM);
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writeb(tmp, s3c_rtc_base + S3C2410_RTCALM);
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clk_disable(rtc_clk);
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return 0;
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return 0;
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}
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}
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@ -103,6 +109,7 @@ static int s3c_rtc_setfreq(struct device *dev, int freq)
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if (!is_power_of_2(freq))
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if (!is_power_of_2(freq))
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return -EINVAL;
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return -EINVAL;
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clk_enable(rtc_clk);
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spin_lock_irq(&s3c_rtc_pie_lock);
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spin_lock_irq(&s3c_rtc_pie_lock);
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if (s3c_rtc_cpu_type == TYPE_S3C2410) {
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if (s3c_rtc_cpu_type == TYPE_S3C2410) {
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@ -114,6 +121,7 @@ static int s3c_rtc_setfreq(struct device *dev, int freq)
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writel(tmp, s3c_rtc_base + S3C2410_TICNT);
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writel(tmp, s3c_rtc_base + S3C2410_TICNT);
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spin_unlock_irq(&s3c_rtc_pie_lock);
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spin_unlock_irq(&s3c_rtc_pie_lock);
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clk_disable(rtc_clk);
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return 0;
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return 0;
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}
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}
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@ -125,6 +133,7 @@ static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
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unsigned int have_retried = 0;
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unsigned int have_retried = 0;
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void __iomem *base = s3c_rtc_base;
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void __iomem *base = s3c_rtc_base;
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clk_enable(rtc_clk);
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retry_get_time:
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retry_get_time:
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rtc_tm->tm_min = readb(base + S3C2410_RTCMIN);
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rtc_tm->tm_min = readb(base + S3C2410_RTCMIN);
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rtc_tm->tm_hour = readb(base + S3C2410_RTCHOUR);
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rtc_tm->tm_hour = readb(base + S3C2410_RTCHOUR);
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@ -157,6 +166,7 @@ static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
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rtc_tm->tm_year += 100;
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rtc_tm->tm_year += 100;
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rtc_tm->tm_mon -= 1;
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rtc_tm->tm_mon -= 1;
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clk_disable(rtc_clk);
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return rtc_valid_tm(rtc_tm);
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return rtc_valid_tm(rtc_tm);
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}
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}
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@ -165,6 +175,7 @@ static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
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void __iomem *base = s3c_rtc_base;
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void __iomem *base = s3c_rtc_base;
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int year = tm->tm_year - 100;
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int year = tm->tm_year - 100;
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clk_enable(rtc_clk);
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pr_debug("set time %04d.%02d.%02d %02d:%02d:%02d\n",
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pr_debug("set time %04d.%02d.%02d %02d:%02d:%02d\n",
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1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
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1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
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tm->tm_hour, tm->tm_min, tm->tm_sec);
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tm->tm_hour, tm->tm_min, tm->tm_sec);
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@ -182,6 +193,7 @@ static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
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writeb(bin2bcd(tm->tm_mday), base + S3C2410_RTCDATE);
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writeb(bin2bcd(tm->tm_mday), base + S3C2410_RTCDATE);
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writeb(bin2bcd(tm->tm_mon + 1), base + S3C2410_RTCMON);
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writeb(bin2bcd(tm->tm_mon + 1), base + S3C2410_RTCMON);
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writeb(bin2bcd(year), base + S3C2410_RTCYEAR);
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writeb(bin2bcd(year), base + S3C2410_RTCYEAR);
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clk_disable(rtc_clk);
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return 0;
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return 0;
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}
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}
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@ -192,6 +204,7 @@ static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
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void __iomem *base = s3c_rtc_base;
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void __iomem *base = s3c_rtc_base;
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unsigned int alm_en;
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unsigned int alm_en;
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clk_enable(rtc_clk);
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alm_tm->tm_sec = readb(base + S3C2410_ALMSEC);
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alm_tm->tm_sec = readb(base + S3C2410_ALMSEC);
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alm_tm->tm_min = readb(base + S3C2410_ALMMIN);
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alm_tm->tm_min = readb(base + S3C2410_ALMMIN);
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alm_tm->tm_hour = readb(base + S3C2410_ALMHOUR);
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alm_tm->tm_hour = readb(base + S3C2410_ALMHOUR);
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@ -243,6 +256,7 @@ static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
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else
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else
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alm_tm->tm_year = -1;
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alm_tm->tm_year = -1;
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clk_disable(rtc_clk);
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return 0;
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return 0;
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}
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}
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@ -252,6 +266,7 @@ static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
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void __iomem *base = s3c_rtc_base;
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void __iomem *base = s3c_rtc_base;
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unsigned int alrm_en;
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unsigned int alrm_en;
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clk_enable(rtc_clk);
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pr_debug("s3c_rtc_setalarm: %d, %04d.%02d.%02d %02d:%02d:%02d\n",
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pr_debug("s3c_rtc_setalarm: %d, %04d.%02d.%02d %02d:%02d:%02d\n",
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alrm->enabled,
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alrm->enabled,
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1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
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1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
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@ -282,6 +297,7 @@ static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
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s3c_rtc_setaie(dev, alrm->enabled);
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s3c_rtc_setaie(dev, alrm->enabled);
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clk_disable(rtc_clk);
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return 0;
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return 0;
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}
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}
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@ -289,6 +305,7 @@ static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
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{
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{
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unsigned int ticnt;
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unsigned int ticnt;
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clk_enable(rtc_clk);
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if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
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if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
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ticnt = readw(s3c_rtc_base + S3C2410_RTCCON);
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ticnt = readw(s3c_rtc_base + S3C2410_RTCCON);
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ticnt &= S3C64XX_RTCCON_TICEN;
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ticnt &= S3C64XX_RTCCON_TICEN;
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@ -298,6 +315,7 @@ static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
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}
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}
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seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no");
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seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no");
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clk_disable(rtc_clk);
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return 0;
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return 0;
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}
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}
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@ -360,6 +378,7 @@ static void s3c_rtc_enable(struct platform_device *pdev, int en)
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if (s3c_rtc_base == NULL)
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if (s3c_rtc_base == NULL)
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return;
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return;
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clk_enable(rtc_clk);
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if (!en) {
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if (!en) {
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tmp = readw(base + S3C2410_RTCCON);
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tmp = readw(base + S3C2410_RTCCON);
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if (s3c_rtc_cpu_type == TYPE_S3C64XX)
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if (s3c_rtc_cpu_type == TYPE_S3C64XX)
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@ -399,6 +418,7 @@ static void s3c_rtc_enable(struct platform_device *pdev, int en)
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base + S3C2410_RTCCON);
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base + S3C2410_RTCCON);
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}
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}
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}
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}
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clk_disable(rtc_clk);
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}
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}
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static int __devexit s3c_rtc_remove(struct platform_device *dev)
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static int __devexit s3c_rtc_remove(struct platform_device *dev)
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@ -410,7 +430,6 @@ static int __devexit s3c_rtc_remove(struct platform_device *dev)
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s3c_rtc_setaie(&dev->dev, 0);
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s3c_rtc_setaie(&dev->dev, 0);
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clk_disable(rtc_clk);
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clk_put(rtc_clk);
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clk_put(rtc_clk);
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rtc_clk = NULL;
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rtc_clk = NULL;
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@ -530,6 +549,8 @@ static int __devinit s3c_rtc_probe(struct platform_device *pdev)
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s3c_rtc_setfreq(&pdev->dev, 1);
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s3c_rtc_setfreq(&pdev->dev, 1);
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clk_disable(rtc_clk);
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return 0;
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return 0;
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err_nortc:
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err_nortc:
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@ -555,6 +576,7 @@ static int ticnt_save, ticnt_en_save;
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static int s3c_rtc_suspend(struct platform_device *pdev, pm_message_t state)
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static int s3c_rtc_suspend(struct platform_device *pdev, pm_message_t state)
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{
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{
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clk_enable(rtc_clk);
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/* save TICNT for anyone using periodic interrupts */
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/* save TICNT for anyone using periodic interrupts */
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ticnt_save = readb(s3c_rtc_base + S3C2410_TICNT);
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ticnt_save = readb(s3c_rtc_base + S3C2410_TICNT);
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if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
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if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
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@ -569,6 +591,7 @@ static int s3c_rtc_suspend(struct platform_device *pdev, pm_message_t state)
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else
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else
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dev_err(&pdev->dev, "enable_irq_wake failed\n");
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dev_err(&pdev->dev, "enable_irq_wake failed\n");
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}
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}
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clk_disable(rtc_clk);
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return 0;
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return 0;
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}
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}
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@ -577,6 +600,7 @@ static int s3c_rtc_resume(struct platform_device *pdev)
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{
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{
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unsigned int tmp;
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unsigned int tmp;
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clk_enable(rtc_clk);
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s3c_rtc_enable(pdev, 1);
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s3c_rtc_enable(pdev, 1);
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writeb(ticnt_save, s3c_rtc_base + S3C2410_TICNT);
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writeb(ticnt_save, s3c_rtc_base + S3C2410_TICNT);
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if (s3c_rtc_cpu_type == TYPE_S3C64XX && ticnt_en_save) {
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if (s3c_rtc_cpu_type == TYPE_S3C64XX && ticnt_en_save) {
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@ -588,6 +612,7 @@ static int s3c_rtc_resume(struct platform_device *pdev)
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disable_irq_wake(s3c_rtc_alarmno);
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disable_irq_wake(s3c_rtc_alarmno);
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wake_en = false;
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wake_en = false;
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}
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}
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clk_disable(rtc_clk);
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return 0;
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return 0;
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}
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}
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