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Commit de75ccdd authored by Alexandre Belloni's avatar Alexandre Belloni
Browse files

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: default avatarAlexandre Belloni <alexandre.belloni@free-electrons.com>
parent 7f742e8e

drivers/rtc/rtc-asm9260.c

+5 −15
Original line number Diff line number Diff line
@@ -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;

}