1 files changed, 117 insertions, 73 deletions

diff --git a/drivers/rtc/rtc-sh.c b/drivers/rtc/rtc-sh.c
index 1c3fc6b428e9..b37f44b0406e 100644
--- a/drivers/rtc/rtc-sh.c
+++ b/drivers/rtc/rtc-sh.c
@@ -99,56 +99,51 @@ struct sh_rtc {
         unsigned short periodic_freq;
 };
 
-static irqreturn_t sh_rtc_interrupt(int irq, void *dev_id)
+static int __sh_rtc_interrupt(struct sh_rtc *rtc)
 {
-        struct sh_rtc *rtc = dev_id;
-        unsigned int tmp;
-
-        spin_lock(&rtc->lock);
+        unsigned int tmp, pending;
 
         tmp = readb(rtc->regbase + RCR1);
+        pending = tmp & RCR1_CF;
         tmp &= ~RCR1_CF;
         writeb(tmp, rtc->regbase + RCR1);
 
         /* Users have requested One x Second IRQ */
-        if (rtc->periodic_freq & PF_OXS)
+        if (pending && rtc->periodic_freq & PF_OXS)
                 rtc_update_irq(rtc->rtc_dev, 1, RTC_UF | RTC_IRQF);
 
-        spin_unlock(&rtc->lock);
-
-        return IRQ_HANDLED;
+        return pending;
 }
 
-static irqreturn_t sh_rtc_alarm(int irq, void *dev_id)
+static int __sh_rtc_alarm(struct sh_rtc *rtc)
 {
-        struct sh_rtc *rtc = dev_id;
-        unsigned int tmp;
-
-        spin_lock(&rtc->lock);
+        unsigned int tmp, pending;
 
         tmp = readb(rtc->regbase + RCR1);
+        pending = tmp & RCR1_AF;
         tmp &= ~(RCR1_AF | RCR1_AIE);
-                writeb(tmp, rtc->regbase + RCR1);
-
-        rtc_update_irq(rtc->rtc_dev, 1, RTC_AF | RTC_IRQF);
+        writeb(tmp, rtc->regbase + RCR1);
 
-        spin_unlock(&rtc->lock);
+        if (pending)
+                rtc_update_irq(rtc->rtc_dev, 1, RTC_AF | RTC_IRQF);
 
-        return IRQ_HANDLED;
+        return pending;
 }
 
-static irqreturn_t sh_rtc_periodic(int irq, void *dev_id)
+static int __sh_rtc_periodic(struct sh_rtc *rtc)
 {
-        struct sh_rtc *rtc = dev_id;
         struct rtc_device *rtc_dev = rtc->rtc_dev;
-        unsigned int tmp;
-
-        spin_lock(&rtc->lock);
+        struct rtc_task *irq_task;
+        unsigned int tmp, pending;
 
         tmp = readb(rtc->regbase + RCR2);
+        pending = tmp & RCR2_PEF;
         tmp &= ~RCR2_PEF;
         writeb(tmp, rtc->regbase + RCR2);
 
+        if (!pending)
+                return 0;
+
         /* Half period enabled than one skipped and the next notified */
         if ((rtc->periodic_freq & PF_HP) && (rtc->periodic_freq & PF_COUNT))
                 rtc->periodic_freq &= ~PF_COUNT;
@@ -157,16 +152,65 @@ static irqreturn_t sh_rtc_periodic(int irq, void *dev_id)
                         rtc->periodic_freq |= PF_COUNT;
                 if (rtc->periodic_freq & PF_KOU) {
                         spin_lock(&rtc_dev->irq_task_lock);
-                        if (rtc_dev->irq_task)
-                                rtc_dev->irq_task->func(rtc_dev->irq_task->private_data);
+                        irq_task = rtc_dev->irq_task;
+                        if (irq_task)
+                                irq_task->func(irq_task->private_data);
                         spin_unlock(&rtc_dev->irq_task_lock);
                 } else
                         rtc_update_irq(rtc->rtc_dev, 1, RTC_PF | RTC_IRQF);
         }
 
+        return pending;
+}
+
+static irqreturn_t sh_rtc_interrupt(int irq, void *dev_id)
+{
+        struct sh_rtc *rtc = dev_id;
+        int ret;
+
+        spin_lock(&rtc->lock);
+        ret = __sh_rtc_interrupt(rtc);
+        spin_unlock(&rtc->lock);
+
+        return IRQ_RETVAL(ret);
+}
+
+static irqreturn_t sh_rtc_alarm(int irq, void *dev_id)
+{
+        struct sh_rtc *rtc = dev_id;
+        int ret;
+
+        spin_lock(&rtc->lock);
+        ret = __sh_rtc_alarm(rtc);
+        spin_unlock(&rtc->lock);
+
+        return IRQ_RETVAL(ret);
+}
+
+static irqreturn_t sh_rtc_periodic(int irq, void *dev_id)
+{
+        struct sh_rtc *rtc = dev_id;
+        int ret;
+
+        spin_lock(&rtc->lock);
+        ret = __sh_rtc_periodic(rtc);
         spin_unlock(&rtc->lock);
 
-        return IRQ_HANDLED;
+        return IRQ_RETVAL(ret);
+}
+
+static irqreturn_t sh_rtc_shared(int irq, void *dev_id)
+{
+        struct sh_rtc *rtc = dev_id;
+        int ret;
+
+        spin_lock(&rtc->lock);
+        ret = __sh_rtc_interrupt(rtc);
+        ret |= __sh_rtc_alarm(rtc);
+        ret |= __sh_rtc_periodic(rtc);
+        spin_unlock(&rtc->lock);
+
+        return IRQ_RETVAL(ret);
 }
 
 static inline void sh_rtc_setpie(struct device *dev, unsigned int enable)
@@ -585,26 +629,12 @@ static int __devinit sh_rtc_probe(struct platform_device *pdev)
         ret = platform_get_irq(pdev, 0);
         if (unlikely(ret <= 0)) {
                 ret = -ENOENT;
-                dev_err(&pdev->dev, "No IRQ for period\n");
+                dev_err(&pdev->dev, "No IRQ resource\n");
                 goto err_badres;
         }
         rtc->periodic_irq = ret;
-
-        ret = platform_get_irq(pdev, 1);
-        if (unlikely(ret <= 0)) {
-                ret = -ENOENT;
-                dev_err(&pdev->dev, "No IRQ for carry\n");
-                goto err_badres;
-        }
-        rtc->carry_irq = ret;
-
-        ret = platform_get_irq(pdev, 2);
-        if (unlikely(ret <= 0)) {
-                ret = -ENOENT;
-                dev_err(&pdev->dev, "No IRQ for alarm\n");
-                goto err_badres;
-        }
-        rtc->alarm_irq = ret;
+        rtc->carry_irq = platform_get_irq(pdev, 1);
+        rtc->alarm_irq = platform_get_irq(pdev, 2);
 
         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
         if (unlikely(res == NULL)) {
@@ -651,35 +681,47 @@ static int __devinit sh_rtc_probe(struct platform_device *pdev)
 
         platform_set_drvdata(pdev, rtc);
 
-        /* register periodic/carry/alarm irqs */
-        ret = request_irq(rtc->periodic_irq, sh_rtc_periodic, IRQF_DISABLED,
-                          "sh-rtc period", rtc);
-        if (unlikely(ret)) {
-                dev_err(&pdev->dev,
-                        "request period IRQ failed with %d, IRQ %d\n", ret,
-                        rtc->periodic_irq);
-                goto err_unmap;
-        }
+        if (rtc->carry_irq <= 0) {
+                /* register shared periodic/carry/alarm irq */
+                ret = request_irq(rtc->periodic_irq, sh_rtc_shared,
+                                  IRQF_DISABLED, "sh-rtc", rtc);
+                if (unlikely(ret)) {
+                        dev_err(&pdev->dev,
+                                "request IRQ failed with %d, IRQ %d\n", ret,
+                                rtc->periodic_irq);
+                        goto err_unmap;
+                }
+        } else {
+                /* register periodic/carry/alarm irqs */
+                ret = request_irq(rtc->periodic_irq, sh_rtc_periodic,
+                                  IRQF_DISABLED, "sh-rtc period", rtc);
+                if (unlikely(ret)) {
+                        dev_err(&pdev->dev,
+                                "request period IRQ failed with %d, IRQ %d\n",
+                                ret, rtc->periodic_irq);
+                        goto err_unmap;
+                }
 
-        ret = request_irq(rtc->carry_irq, sh_rtc_interrupt, IRQF_DISABLED,
-                          "sh-rtc carry", rtc);
-        if (unlikely(ret)) {
-                dev_err(&pdev->dev,
-                        "request carry IRQ failed with %d, IRQ %d\n", ret,
-                        rtc->carry_irq);
-                free_irq(rtc->periodic_irq, rtc);
-                goto err_unmap;
-        }
+                ret = request_irq(rtc->carry_irq, sh_rtc_interrupt,
+                                  IRQF_DISABLED, "sh-rtc carry", rtc);
+                if (unlikely(ret)) {
+                        dev_err(&pdev->dev,
+                                "request carry IRQ failed with %d, IRQ %d\n",
+                                ret, rtc->carry_irq);
+                        free_irq(rtc->periodic_irq, rtc);
+                        goto err_unmap;
+                }
 
-        ret = request_irq(rtc->alarm_irq, sh_rtc_alarm, IRQF_DISABLED,
-                          "sh-rtc alarm", rtc);
-        if (unlikely(ret)) {
-                dev_err(&pdev->dev,
-                        "request alarm IRQ failed with %d, IRQ %d\n", ret,
-                        rtc->alarm_irq);
-                free_irq(rtc->carry_irq, rtc);
-                free_irq(rtc->periodic_irq, rtc);
-                goto err_unmap;
+                ret = request_irq(rtc->alarm_irq, sh_rtc_alarm,
+                                  IRQF_DISABLED, "sh-rtc alarm", rtc);
+                if (unlikely(ret)) {
+                        dev_err(&pdev->dev,
+                                "request alarm IRQ failed with %d, IRQ %d\n",
+                                ret, rtc->alarm_irq);
+                        free_irq(rtc->carry_irq, rtc);
+                        free_irq(rtc->periodic_irq, rtc);
+                        goto err_unmap;
+                }
         }
 
         tmp = readb(rtc->regbase + RCR1);
@@ -709,9 +751,11 @@ static int __devexit sh_rtc_remove(struct platform_device *pdev)
         sh_rtc_setpie(&pdev->dev, 0);
         sh_rtc_setaie(&pdev->dev, 0);
 
-        free_irq(rtc->carry_irq, rtc);
         free_irq(rtc->periodic_irq, rtc);
-        free_irq(rtc->alarm_irq, rtc);
+        if (rtc->carry_irq > 0) {
+                free_irq(rtc->carry_irq, rtc);
+                free_irq(rtc->alarm_irq, rtc);
+        }
 
         release_resource(rtc->res);