From: Magnus Damm <magnus.damm@gmail.com>
To: linux-sh@vger.kernel.org
Subject: [PATCH] sh: sh-rtc carry interrupt rework
Date: Thu, 19 Mar 2009 10:05:58 +0000 [thread overview]
Message-ID: <20090319100558.9820.49100.sendpatchset@rx1.opensource.se> (raw)
From: Magnus Damm <damm@igel.co.jp>
This patch modifies the SuperH RTC driver to only
enable carry interrupts when needed. So by default
no interrupts are enabled with this patch. Without
this patch a suspending system will most likely
wake up by the carry interrupt regardless if the
alarm interrupt has been enabled or not.
Signed-off-by: Magnus Damm <damm@igel.co.jp>
---
Tested on sh7723/ap320 hardware.
drivers/rtc/rtc-sh.c | 40 ++++++++++++++++++++++++++++++++--------
1 file changed, 32 insertions(+), 8 deletions(-)
--- 0001/drivers/rtc/rtc-sh.c
+++ work/drivers/rtc/rtc-sh.c 2009-03-19 18:29:29.000000000 +0900
@@ -319,6 +319,25 @@ static int sh_rtc_proc(struct device *de
return 0;
}
+static inline void sh_rtc_setcie(struct device *dev, unsigned int enable)
+{
+ struct sh_rtc *rtc = dev_get_drvdata(dev);
+ unsigned int tmp;
+
+ spin_lock_irq(&rtc->lock);
+
+ tmp = readb(rtc->regbase + RCR1);
+
+ if (!enable)
+ tmp &= ~RCR1_CIE;
+ else
+ tmp |= RCR1_CIE;
+
+ writeb(tmp, rtc->regbase + RCR1);
+
+ spin_unlock_irq(&rtc->lock);
+}
+
static int sh_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
{
struct sh_rtc *rtc = dev_get_drvdata(dev);
@@ -335,9 +354,11 @@ static int sh_rtc_ioctl(struct device *d
break;
case RTC_UIE_OFF:
rtc->periodic_freq &= ~PF_OXS;
+ sh_rtc_setcie(dev, 0);
break;
case RTC_UIE_ON:
rtc->periodic_freq |= PF_OXS;
+ sh_rtc_setcie(dev, 1);
break;
case RTC_IRQP_READ:
ret = put_user(rtc->rtc_dev->irq_freq,
@@ -400,6 +421,10 @@ static int sh_rtc_read_time(struct devic
tm->tm_sec--;
#endif
+ /* only keep the carry interrupt enabled if UIE is on */
+ if (!(rtc->periodic_freq & PF_OXS))
+ sh_rtc_setcie(dev, 0);
+
dev_dbg(dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
"mday=%d, mon=%d, year=%d, wday=%d\n",
__func__,
@@ -616,7 +641,6 @@ static int __devinit sh_rtc_probe(struct
{
struct sh_rtc *rtc;
struct resource *res;
- unsigned int tmp;
int ret;
rtc = kzalloc(sizeof(struct sh_rtc), GFP_KERNEL);
@@ -676,8 +700,6 @@ static int __devinit sh_rtc_probe(struct
}
rtc->rtc_dev->max_user_freq = 256;
- rtc->rtc_dev->irq_freq = 1;
- rtc->periodic_freq = 0x60;
platform_set_drvdata(pdev, rtc);
@@ -724,11 +746,12 @@ static int __devinit sh_rtc_probe(struct
}
}
- tmp = readb(rtc->regbase + RCR1);
- tmp &= ~RCR1_CF;
- tmp |= RCR1_CIE;
- writeb(tmp, rtc->regbase + RCR1);
-
+ /* everything disabled by default */
+ rtc->periodic_freq = 0;
+ rtc->rtc_dev->irq_freq = 0;
+ sh_rtc_setpie(&pdev->dev, 0);
+ sh_rtc_setaie(&pdev->dev, 0);
+ sh_rtc_setcie(&pdev->dev, 0);
return 0;
err_unmap:
@@ -750,6 +773,7 @@ static int __devexit sh_rtc_remove(struc
sh_rtc_setpie(&pdev->dev, 0);
sh_rtc_setaie(&pdev->dev, 0);
+ sh_rtc_setcie(&pdev->dev, 0);
free_irq(rtc->periodic_irq, rtc);
if (rtc->carry_irq > 0) {
reply other threads:[~2009-03-19 10:05 UTC|newest]
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