diff options
Diffstat (limited to 'drivers/rtc/rtc-zynqmp.c')
| -rw-r--r-- | drivers/rtc/rtc-zynqmp.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-zynqmp.c b/drivers/rtc/rtc-zynqmp.c index f39102b66eac..3baa2b481d9f 100644 --- a/drivers/rtc/rtc-zynqmp.c +++ b/drivers/rtc/rtc-zynqmp.c @@ -277,6 +277,10 @@ static irqreturn_t xlnx_rtc_interrupt(int irq, void *id) static int xlnx_rtc_probe(struct platform_device *pdev) { struct xlnx_rtc_dev *xrtcdev; + bool is_alarm_set = false; + u32 pending_alrm_irq; + u32 current_time; + u32 alarm_time; int ret; xrtcdev = devm_kzalloc(&pdev->dev, sizeof(*xrtcdev), GFP_KERNEL); @@ -296,6 +300,17 @@ static int xlnx_rtc_probe(struct platform_device *pdev) if (IS_ERR(xrtcdev->reg_base)) return PTR_ERR(xrtcdev->reg_base); + /* Clear any pending alarm interrupts from previous kernel/boot */ + pending_alrm_irq = readl(xrtcdev->reg_base + RTC_INT_STS) & RTC_INT_ALRM; + if (pending_alrm_irq) + writel(pending_alrm_irq, xrtcdev->reg_base + RTC_INT_STS); + + /* Check if a valid alarm is already set from previous kernel/boot */ + alarm_time = readl(xrtcdev->reg_base + RTC_ALRM); + current_time = readl(xrtcdev->reg_base + RTC_CUR_TM); + if (alarm_time > current_time && alarm_time != 0) + is_alarm_set = true; + xrtcdev->alarm_irq = platform_get_irq_byname(pdev, "alarm"); if (xrtcdev->alarm_irq < 0) return xrtcdev->alarm_irq; @@ -337,6 +352,10 @@ static int xlnx_rtc_probe(struct platform_device *pdev) xlnx_init_rtc(xrtcdev); + /* Re-enable alarm interrupt if a valid alarm was found */ + if (is_alarm_set) + writel(RTC_INT_ALRM, xrtcdev->reg_base + RTC_INT_EN); + device_init_wakeup(&pdev->dev, true); return devm_rtc_register_device(xrtcdev->rtc); |