The RZN1 RTC can trigger an interrupt when reaching a particular date up
to 7 days ahead. Bring support for this alarm.
One drawback though, the granularity is about a minute.
Signed-off-by: Miquel Raynal <miquel.raynal@xxxxxxxxxxx>
---
drivers/rtc/rtc-rzn1.c | 106 ++++++++++++++++++++++++++++++++++++++++-
1 file changed, 105 insertions(+), 1 deletion(-)
diff --git a/drivers/rtc/rtc-rzn1.c b/drivers/rtc/rtc-rzn1.c
index a5dfb5bb163c..7a3c95e5edd0 100644
--- a/drivers/rtc/rtc-rzn1.c
+++ b/drivers/rtc/rtc-rzn1.c
@@ -158,14 +158,107 @@ static int rzn1_rtc_set_time(struct device *dev, struct rtc_time *tm)
return 0;
}
+static irqreturn_t rzn1_rtc_alarm_irq(int irq, void *dev_id)
+{
+ struct rzn1_rtc *rtc = dev_id;
+
+ rtc_update_irq(rtc->rtcdev, 1, RTC_AF | RTC_IRQF);
+
+ return IRQ_HANDLED;
+}
+
+static int rzn1_rtc_alarm_irq_enable(struct device *dev, unsigned int enable)
+{
+ struct rzn1_rtc *rtc = dev_get_drvdata(dev);
+ u32 ctl1 = readl(rtc->base + RZN1_RTC_CTL1);
+
+ if (enable)
+ ctl1 |= RZN1_RTC_CTL1_ALME;
+ else
+ ctl1 &= ~RZN1_RTC_CTL1_ALME;
+
+ writel(ctl1, rtc->base + RZN1_RTC_CTL1);
+
+ return 0;
+}
+
+static int rzn1_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+ struct rzn1_rtc *rtc = dev_get_drvdata(dev);
+ struct rtc_time *tm = &alrm->time;
+ unsigned int min, hour, wday, delta_days;
+ time64_t alarm;
+ u32 ctl1;
+ int ret;
+
+ ret = rzn1_rtc_read_time(dev, tm);
+ if (ret)
+ return ret;
+
+ min = readl(rtc->base + RZN1_RTC_ALM);
+ hour = readl(rtc->base + RZN1_RTC_ALH);
+ wday = readl(rtc->base + RZN1_RTC_ALW);
+
+ tm->tm_sec = 0;
+ tm->tm_min = bcd2bin(min);
+ tm->tm_hour = bcd2bin(hour);
+ delta_days = ((fls(wday) - 1) - tm->tm_wday + 7) % 7;
+ tm->tm_wday = fls(wday) - 1;
+
+ if (delta_days) {
+ alarm = rtc_tm_to_time64(tm) + (delta_days * 86400);
+ rtc_time64_to_tm(alarm, tm);
+ }
+
+ ctl1 = readl(rtc->base + RZN1_RTC_CTL1);
+ alrm->enabled = !!(ctl1 & RZN1_RTC_CTL1_ALME);
+
+ return 0;
+}
+
+static int rzn1_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+ struct rzn1_rtc *rtc = dev_get_drvdata(dev);
+ struct rtc_time *tm = &alrm->time, tm_now;
+ unsigned long alarm, farest;
+ unsigned int days_ahead, wday;
+ int ret;
+
+ ret = rzn1_rtc_read_time(dev, &tm_now);
+ if (ret)
+ return ret;
+
+ /* We cannot set alarms more than one week ahead */
+ farest = rtc_tm_to_time64(&tm_now) + (7 * 86400);
+ alarm = rtc_tm_to_time64(tm);
+ if (time_after(alarm, farest))
+ return -ERANGE;
+
+ /* Convert alarm day into week day */
+ days_ahead = tm->tm_mday - tm_now.tm_mday;
+ wday = (tm_now.tm_wday + days_ahead) % 7;
+
+ writel(bin2bcd(tm->tm_min), rtc->base + RZN1_RTC_ALM);
+ writel(bin2bcd(tm->tm_hour), rtc->base + RZN1_RTC_ALH);
+ writel(BIT(wday), rtc->base + RZN1_RTC_ALW);
+
+ rzn1_rtc_alarm_irq_enable(dev, alrm->enabled);
+
+ return 0;
+}
+
static const struct rtc_class_ops rzn1_rtc_ops = {
.read_time = rzn1_rtc_read_time,
.set_time = rzn1_rtc_set_time,
+ .read_alarm = rzn1_rtc_read_alarm,
+ .set_alarm = rzn1_rtc_set_alarm,
+ .alarm_irq_enable = rzn1_rtc_alarm_irq_enable,
};
static int rzn1_rtc_probe(struct platform_device *pdev)
{
struct rzn1_rtc *rtc;
+ int alarm_irq;
int ret;
rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
@@ -182,6 +275,10 @@ static int rzn1_rtc_probe(struct platform_device *pdev)
if (IS_ERR(rtc->base))
return dev_err_probe(&pdev->dev, PTR_ERR(rtc->base), "Missing reg\n");
+ alarm_irq = platform_get_irq(pdev, 0);
+ if (alarm_irq < 0)
+ return dev_err_probe(&pdev->dev, alarm_irq, "Missing timer IRQ\n");
+
rtc->rtcdev = devm_rtc_allocate_device(&pdev->dev);
if (IS_ERR(rtc->rtcdev))
return PTR_ERR(rtc);
@@ -189,7 +286,7 @@ static int rzn1_rtc_probe(struct platform_device *pdev)
rtc->rtcdev->range_min = RTC_TIMESTAMP_BEGIN_2000;
rtc->rtcdev->range_max = RTC_TIMESTAMP_END_2099;
rtc->rtcdev->ops = &rzn1_rtc_ops;
- clear_bit(RTC_FEATURE_ALARM, rtc->rtcdev->features);
+ set_bit(RTC_FEATURE_ALARM_RES_MINUTE, rtc->rtcdev->features);
clear_bit(RTC_FEATURE_UPDATE_INTERRUPT, rtc->rtcdev->features);
ret = clk_prepare_enable(rtc->clk);
@@ -206,6 +303,13 @@ static int rzn1_rtc_probe(struct platform_device *pdev)
/* Disable all interrupts */
writel(0, rtc->base + RZN1_RTC_CTL1);
+ ret = devm_request_irq(&pdev->dev, alarm_irq, rzn1_rtc_alarm_irq, 0,
+ dev_name(&pdev->dev), rtc);
+ if (ret) {
+ dev_err(&pdev->dev, "RTC timer interrupt not available\n");
+ goto disable_clk;
+ }
+
ret = devm_rtc_register_device(rtc->rtcdev);
if (ret)
goto disable_clk;
--
2.27.0
