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rtc: at91sam9: rework wakeup and interrupt handling 

The IRQ line used by the RTC device is usually shared with the system timer
(PIT) on at91 platforms.

Since timers are registering their handlers with IRQF_NO_SUSPEND, we should
expect being called in suspended state, and properly wake the system up
when this is the case.

Set IRQF_COND_SUSPEND flag when registering the IRQ handler to inform
irq core that it can safely be called while the system is suspended.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Reviewed-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Boris BREZILLON 2015-03-02 10:18:14 +01:00 committed by Rafael J. Wysocki
parent 432ec92b29
commit 603b1a2326
1 changed files with 63 additions and 14 deletions
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77
drivers/rtc/rtc-at91sam9.c
View File

@ -23,6 +23,7 @@
#include <linux/io.h>
#include <linux/mfd/syscon.h>
#include <linux/regmap.h>
#include <linux/suspend.h>
#include <linux/clk.h>
/*
@ -77,6 +78,9 @@ struct sam9_rtc {
unsigned int gpbr_offset;
int irq;
struct clk *sclk;
bool suspended;
unsigned long events;
spinlock_t lock;
};
#define rtt_readl(rtc, field) \
@ -271,14 +275,9 @@ static int at91_rtc_proc(struct device *dev, struct seq_file *seq)
return 0;
}
/*
* IRQ handler for the RTC
*/
static irqreturn_t at91_rtc_interrupt(int irq, void *_rtc)
static irqreturn_t at91_rtc_cache_events(struct sam9_rtc *rtc)
{
struct sam9_rtc *rtc = _rtc;
u32 sr, mr;
unsigned long events = 0;
/* Shared interrupt may be for another device. Note: reading
* SR clears it, so we must only read it in this irq handler!
@ -290,20 +289,56 @@ static irqreturn_t at91_rtc_interrupt(int irq, void *_rtc)
/* alarm status */
if (sr & AT91_RTT_ALMS)
events |= (RTC_AF | RTC_IRQF);
rtc->events |= (RTC_AF | RTC_IRQF);
/* timer update/increment */
if (sr & AT91_RTT_RTTINC)
events |= (RTC_UF | RTC_IRQF);
rtc_update_irq(rtc->rtcdev, 1, events);
pr_debug("%s: num=%ld, events=0x%02lx\n", __func__,
events >> 8, events & 0x000000FF);
rtc->events |= (RTC_UF | RTC_IRQF);
return IRQ_HANDLED;
}
static void at91_rtc_flush_events(struct sam9_rtc *rtc)
{
if (!rtc->events)
return;
rtc_update_irq(rtc->rtcdev, 1, rtc->events);
rtc->events = 0;
pr_debug("%s: num=%ld, events=0x%02lx\n", __func__,
rtc->events >> 8, rtc->events & 0x000000FF);
}
/*
* IRQ handler for the RTC
*/
static irqreturn_t at91_rtc_interrupt(int irq, void *_rtc)
{
struct sam9_rtc *rtc = _rtc;
int ret;
spin_lock(&rtc->lock);
ret = at91_rtc_cache_events(rtc);
/* We're called in suspended state */
if (rtc->suspended) {
/* Mask irqs coming from this peripheral */
rtt_writel(rtc, MR,
rtt_readl(rtc, MR) &
~(AT91_RTT_ALMIEN | AT91_RTT_RTTINCIEN));
/* Trigger a system wakeup */
pm_system_wakeup();
} else {
at91_rtc_flush_events(rtc);
}
spin_unlock(&rtc->lock);
return ret;
}
static const struct rtc_class_ops at91_rtc_ops = {
.read_time = at91_rtc_readtime,
.set_time = at91_rtc_settime,
@ -421,7 +456,8 @@ static int at91_rtc_probe(struct platform_device *pdev)
/* register irq handler after we know what name we'll use */
ret = devm_request_irq(&pdev->dev, rtc->irq, at91_rtc_interrupt,
IRQF_SHARED, dev_name(&rtc->rtcdev->dev), rtc);
IRQF_SHARED | IRQF_COND_SUSPEND,
dev_name(&rtc->rtcdev->dev), rtc);
if (ret) {
dev_dbg(&pdev->dev, "can't share IRQ %d?\n", rtc->irq);
return ret;
@ -482,7 +518,12 @@ static int at91_rtc_suspend(struct device *dev)
rtc->imr = mr & (AT91_RTT_ALMIEN | AT91_RTT_RTTINCIEN);
if (rtc->imr) {
if (device_may_wakeup(dev) && (mr & AT91_RTT_ALMIEN)) {
unsigned long flags;
enable_irq_wake(rtc->irq);
spin_lock_irqsave(&rtc->lock, flags);
rtc->suspended = true;
spin_unlock_irqrestore(&rtc->lock, flags);
/* don't let RTTINC cause wakeups */
if (mr & AT91_RTT_RTTINCIEN)
rtt_writel(rtc, MR, mr & ~AT91_RTT_RTTINCIEN);
@ -499,10 +540,18 @@ static int at91_rtc_resume(struct device *dev)
u32 mr;
if (rtc->imr) {
unsigned long flags;
if (device_may_wakeup(dev))
disable_irq_wake(rtc->irq);
mr = rtt_readl(rtc, MR);
rtt_writel(rtc, MR, mr | rtc->imr);
spin_lock_irqsave(&rtc->lock, flags);
rtc->suspended = false;
at91_rtc_cache_events(rtc);
at91_rtc_flush_events(rtc);
spin_unlock_irqrestore(&rtc->lock, flags);
}
return 0;