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rtc: brcmstb-waketimer: allow use as non-wake alarm 

The wake interrupt only fires when the system is in a suspend
state. Fortunately we have another interrupt that fires in a
non-suspend state at the L2 controller UPG_AUX_AON. Add support
for this interrupt line so we can use the alarm in a non-wake
context.

Signed-off-by: Doug Berger <opendmb@gmail.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Link: https://lore.kernel.org/r/20230124201430.2502371-3-opendmb@gmail.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Doug Berger 2023-01-24 12:14:30 -08:00 committed by Alexandre Belloni
parent 6cc7a8262b
commit 24304a8715
1 changed files with 52 additions and 3 deletions
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55
drivers/rtc/rtc-brcmstb-waketimer.c
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@ -28,6 +28,7 @@ struct brcmstb_waketmr {
struct device *dev;
void __iomem *base;
unsigned int wake_irq;
unsigned int alarm_irq;
struct notifier_block reboot_notifier;
struct clk *clk;
u32 rate;
@ -56,6 +57,8 @@ static inline void brcmstb_waketmr_clear_alarm(struct brcmstb_waketmr *timer)
{
u32 reg;
if (timer->alarm_en && timer->alarm_irq)
disable_irq(timer->alarm_irq);
timer->alarm_en = false;
reg = readl_relaxed(timer->base + BRCMSTB_WKTMR_COUNTER);
writel_relaxed(reg - 1, timer->base + BRCMSTB_WKTMR_ALARM);
@ -88,7 +91,25 @@ static irqreturn_t brcmstb_waketmr_irq(int irq, void *data)
{
struct brcmstb_waketmr *timer = data;
pm_wakeup_event(timer->dev, 0);
if (!timer->alarm_irq)
pm_wakeup_event(timer->dev, 0);
return IRQ_HANDLED;
}
static irqreturn_t brcmstb_alarm_irq(int irq, void *data)
{
struct brcmstb_waketmr *timer = data;
/* Ignore spurious interrupts */
if (!brcmstb_waketmr_is_pending(timer))
return IRQ_HANDLED;
if (timer->alarm_en) {
if (!device_may_wakeup(timer->dev))
writel_relaxed(WKTMR_ALARM_EVENT,
timer->base + BRCMSTB_WKTMR_EVENT);
rtc_update_irq(timer->rtc, 1, RTC_IRQF | RTC_AF);
}
return IRQ_HANDLED;
}
@ -114,7 +135,7 @@ static void wktmr_read(struct brcmstb_waketmr *timer,
static int brcmstb_waketmr_prepare_suspend(struct brcmstb_waketmr *timer)
{
struct device *dev = timer->dev;
int ret = 0;
int ret;
if (device_may_wakeup(dev)) {
ret = enable_irq_wake(timer->wake_irq);
@ -122,9 +143,17 @@ static int brcmstb_waketmr_prepare_suspend(struct brcmstb_waketmr *timer)
dev_err(dev, "failed to enable wake-up interrupt\n");
return ret;
}
if (timer->alarm_en && timer->alarm_irq) {
ret = enable_irq_wake(timer->alarm_irq);
if (ret) {
dev_err(dev, "failed to enable rtc interrupt\n");
disable_irq_wake(timer->wake_irq);
return ret;
}
}
}
return ret;
return 0;
}
/* If enabled as a wakeup-source, arm the timer when powering off */
@ -192,7 +221,11 @@ static int brcmstb_waketmr_alarm_enable(struct device *dev,
!brcmstb_waketmr_is_pending(timer))
return -EINVAL;
timer->alarm_en = true;
if (timer->alarm_irq)
enable_irq(timer->alarm_irq);
} else if (!enabled && timer->alarm_en) {
if (timer->alarm_irq)
disable_irq(timer->alarm_irq);
timer->alarm_en = false;
}
@ -269,6 +302,19 @@ static int brcmstb_waketmr_probe(struct platform_device *pdev)
if (ret < 0)
goto err_clk;
brcmstb_waketmr_clear_alarm(timer);
/* Attempt to initialize non-wake irq */
ret = platform_get_irq(pdev, 1);
if (ret > 0) {
timer->alarm_irq = (unsigned int)ret;
ret = devm_request_irq(dev, timer->alarm_irq, brcmstb_alarm_irq,
IRQF_NO_AUTOEN, "brcmstb-waketimer-rtc",
timer);
if (ret < 0)
timer->alarm_irq = 0;
}
timer->reboot_notifier.notifier_call = brcmstb_waketmr_reboot;
register_reboot_notifier(&timer->reboot_notifier);
@ -317,6 +363,8 @@ static int brcmstb_waketmr_resume(struct device *dev)
return 0;
ret = disable_irq_wake(timer->wake_irq);
if (timer->alarm_en && timer->alarm_irq)
disable_irq_wake(timer->alarm_irq);
brcmstb_waketmr_clear_alarm(timer);
@ -346,4 +394,5 @@ module_platform_driver(brcmstb_waketmr_driver);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Brian Norris");
MODULE_AUTHOR("Markus Mayer");
MODULE_AUTHOR("Doug Berger");
MODULE_DESCRIPTION("Wake-up timer driver for STB chips");