rtc: asm9260: rework locking

The rtc-asm9260 driver uses a discrete spinlock (wrongly uninitialized).
Use the rtc mutex to lock mmio accesses instead.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

diff --git a/drivers/rtc/rtc-asm9260.c b/drivers/rtc/rtc-asm9260.c
index 5219916ce11d2b609bde574a4b99f72d279eb8e9..18a93d3e3f9317286c99f9718ea1d42ea95ebd50 100644 (file)
--- a/drivers/rtc/rtc-asm9260.c
+++ b/drivers/rtc/rtc-asm9260.c
@@ -112,8 +112,6 @@ struct asm9260_rtc_priv {
        void __iomem            *iobase;
        struct rtc_device       *rtc;
        struct clk              *clk;
-       /* io lock */
-       spinlock_t              lock;
 };
 
 static irqreturn_t asm9260_rtc_irq(int irq, void *dev_id)
@@ -122,11 +120,15 @@ static irqreturn_t asm9260_rtc_irq(int irq, void *dev_id)
        u32 isr;
        unsigned long events = 0;
 
+       mutex_lock(&priv->rtc->ops_lock);
        isr = ioread32(priv->iobase + HW_CIIR);
-       if (!isr)
+       if (!isr) {
+               mutex_unlock(&priv->rtc->ops_lock);
                return IRQ_NONE;
+       }
 
        iowrite32(0, priv->iobase + HW_CIIR);
+       mutex_unlock(&priv->rtc->ops_lock);
 
        events |= RTC_AF | RTC_IRQF;
 
@@ -139,9 +141,7 @@ static int asm9260_rtc_read_time(struct device *dev, struct rtc_time *tm)
 {
        struct asm9260_rtc_priv *priv = dev_get_drvdata(dev);
        u32 ctime0, ctime1, ctime2;
-       unsigned long irq_flags;
 
-       spin_lock_irqsave(&priv->lock, irq_flags);
        ctime0 = ioread32(priv->iobase + HW_CTIME0);
        ctime1 = ioread32(priv->iobase + HW_CTIME1);
        ctime2 = ioread32(priv->iobase + HW_CTIME2);
@@ -155,7 +155,6 @@ static int asm9260_rtc_read_time(struct device *dev, struct rtc_time *tm)
                ctime1 = ioread32(priv->iobase + HW_CTIME1);
                ctime2 = ioread32(priv->iobase + HW_CTIME2);
        }
-       spin_unlock_irqrestore(&priv->lock, irq_flags);
 
        tm->tm_sec  = (ctime0 >> BM_CTIME0_SEC_S)  & BM_CTIME0_SEC_M;
        tm->tm_min  = (ctime0 >> BM_CTIME0_MIN_S)  & BM_CTIME0_MIN_M;
@@ -174,9 +173,7 @@ static int asm9260_rtc_read_time(struct device *dev, struct rtc_time *tm)
 static int asm9260_rtc_set_time(struct device *dev, struct rtc_time *tm)
 {
        struct asm9260_rtc_priv *priv = dev_get_drvdata(dev);
-       unsigned long irq_flags;
 
-       spin_lock_irqsave(&priv->lock, irq_flags);
        /*
         * make sure SEC counter will not flip other counter on write time,
         * real value will be written at the enf of sequence.
@@ -191,7 +188,6 @@ static int asm9260_rtc_set_time(struct device *dev, struct rtc_time *tm)
        iowrite32(tm->tm_hour, priv->iobase + HW_HOUR);
        iowrite32(tm->tm_min,  priv->iobase + HW_MIN);
        iowrite32(tm->tm_sec,  priv->iobase + HW_SEC);
-       spin_unlock_irqrestore(&priv->lock, irq_flags);
 
        return 0;
 }
@@ -199,9 +195,7 @@ static int asm9260_rtc_set_time(struct device *dev, struct rtc_time *tm)
 static int asm9260_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 {
        struct asm9260_rtc_priv *priv = dev_get_drvdata(dev);
-       unsigned long irq_flags;
 
-       spin_lock_irqsave(&priv->lock, irq_flags);
        alrm->time.tm_year = ioread32(priv->iobase + HW_ALYEAR);
        alrm->time.tm_mon  = ioread32(priv->iobase + HW_ALMON);
        alrm->time.tm_mday = ioread32(priv->iobase + HW_ALDOM);
@@ -213,7 +207,6 @@ static int asm9260_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 
        alrm->enabled = ioread32(priv->iobase + HW_AMR) ? 1 : 0;
        alrm->pending = ioread32(priv->iobase + HW_CIIR) ? 1 : 0;
-       spin_unlock_irqrestore(&priv->lock, irq_flags);
 
        return rtc_valid_tm(&alrm->time);
 }
@@ -221,9 +214,7 @@ static int asm9260_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 static int asm9260_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 {
        struct asm9260_rtc_priv *priv = dev_get_drvdata(dev);
-       unsigned long irq_flags;
 
-       spin_lock_irqsave(&priv->lock, irq_flags);
        iowrite32(alrm->time.tm_year, priv->iobase + HW_ALYEAR);
        iowrite32(alrm->time.tm_mon,  priv->iobase + HW_ALMON);
        iowrite32(alrm->time.tm_mday, priv->iobase + HW_ALDOM);
@@ -234,7 +225,6 @@ static int asm9260_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
        iowrite32(alrm->time.tm_sec,  priv->iobase + HW_ALSEC);
 
        iowrite32(alrm->enabled ? 0 : BM_AMR_OFF, priv->iobase + HW_AMR);
-       spin_unlock_irqrestore(&priv->lock, irq_flags);
 
        return 0;
 }