75 lines
2.3 KiB
Diff
75 lines
2.3 KiB
Diff
|
Some boards like the Turris Omnia have an RTC chip that does not get
|
||
|
|
initialized. Initializing the RTC at the driver level helps get rid of
|
||
|
|
bootloader hacks that write special register values.
|
||
|
|
|
||
|
|
--- a/drivers/rtc/rtc-armada38x.c
|
||
|
|
+++ b/drivers/rtc/rtc-armada38x.c
|
||
|
|
@@ -30,6 +30,9 @@
|
||
|
|
#define RTC_IRQ_FREQ_1HZ BIT(2)
|
||
|
|
#define RTC_CCR 0x18
|
||
|
|
#define RTC_CCR_MODE BIT(15)
|
||
|
|
+#define RTC_CCR_NORMAL_PPB 0x2000
|
||
|
|
+#define RTC_TEST_CONF 0x1c
|
||
|
|
+#define RTC_TEST_CONF_MASK 0xff
|
||
|
|
|
||
|
|
#define RTC_TIME 0xC
|
||
|
|
#define RTC_ALARM1 0x10
|
||
|
|
@@ -91,6 +94,7 @@ struct armada38x_rtc_data {
|
||
|
|
void (*clear_isr)(struct armada38x_rtc *rtc);
|
||
|
|
void (*unmask_interrupt)(struct armada38x_rtc *rtc);
|
||
|
|
u32 alarm;
|
||
|
|
+ void (*init_rtc)(struct armada38x_rtc *rtc);
|
||
|
|
};
|
||
|
|
|
||
|
|
/*
|
||
|
|
@@ -202,6 +206,23 @@ static void armada38x_unmask_interrupt(s
|
||
|
|
writel(val | SOC_RTC_ALARM1_MASK, rtc->regs_soc + SOC_RTC_INTERRUPT);
|
||
|
|
}
|
||
|
|
|
||
|
|
+static void armada38x_rtc_init(struct armada38x_rtc *rtc)
|
||
|
|
+{
|
||
|
|
+ u32 reg;
|
||
|
|
+
|
||
|
|
+ /* Test RTC test configuration register bits [7:0] */
|
||
|
|
+ reg = readl(rtc->regs + RTC_TEST_CONF);
|
||
|
|
+ /* If bits [7:0] are non-zero, assume RTC was uninitialized */
|
||
|
|
+ if (reg & RTC_TEST_CONF_MASK) {
|
||
|
|
+ rtc_delayed_write(0, rtc, RTC_TEST_CONF);
|
||
|
|
+ rtc_delayed_write(0, rtc, RTC_TIME);
|
||
|
|
+ rtc_delayed_write((RTC_STATUS_ALARM1 | RTC_STATUS_ALARM2),
|
||
|
|
+ rtc, RTC_STATUS);
|
||
|
|
+ rtc_delayed_write(RTC_CCR_NORMAL_PPB, rtc, RTC_CCR);
|
||
|
|
+ }
|
||
|
|
+ return;
|
||
|
|
+}
|
||
|
|
+
|
||
|
|
static void armada8k_clear_isr(struct armada38x_rtc *rtc)
|
||
|
|
{
|
||
|
|
writel(RTC_8K_ALARM2, rtc->regs_soc + RTC_8K_ISR);
|
||
|
|
@@ -464,6 +485,7 @@ static const struct armada38x_rtc_data a
|
||
|
|
.clear_isr = armada38x_clear_isr,
|
||
|
|
.unmask_interrupt = armada38x_unmask_interrupt,
|
||
|
|
.alarm = ALARM1,
|
||
|
|
+ .init_rtc = armada38x_rtc_init,
|
||
|
|
};
|
||
|
|
|
||
|
|
static const struct armada38x_rtc_data armada8k_data = {
|
||
|
|
@@ -558,6 +580,17 @@ static __init int armada38x_rtc_probe(st
|
||
|
|
dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
+
|
||
|
|
+ /*
|
||
|
|
+ * Try to detect if RTC is in uninitialized state.
|
||
|
|
+ * It is not definitive to know if the RTC is in an uninialized state or not,
|
||
|
|
+ * but the following call will read some bits in the RTC unit and guess if
|
||
|
|
+ * if it's in that state, and accordingly set it to sane default values.
|
||
|
|
+ */
|
||
|
|
+ if (rtc->data->init_rtc) {
|
||
|
|
+ rtc->data->init_rtc(rtc);
|
||
|
|
+ }
|
||
|
|
+
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|