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Reworking patches for mvebu-dev / clearfog

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count-doku 2019-12-27 21:20:41 +01:00
parent 3948459c2b
commit 76bc478179
47 changed files with 82841 additions and 3 deletions
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74
patch/kernel/mvebu-dev/421-rtc-initialize.patch Normal file
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@ -0,0 +1,74 @@
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
@@ -30,7 +30,10 @@
#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_CONF_TEST 0x1C
+#define RTC_TEST_CONF 0x1c
+#define RTC_TEST_CONF_MASK 0xff
#define RTC_NOMINAL_TIMING BIT(13)
#define RTC_TIME 0xC
@@ -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 = {
@@ -580,6 +580,16 @@ static __init int armada38x_rtc_probe(struct platform_device *pdev)
/* Update RTC-MBUS bridge timing parameters */
rtc->data->update_mbus_timing(rtc);
+ /*
+ * 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);
+ }
+
rtc->rtc_dev->range_max = U32_MAX;
return rtc_register_device(rtc->rtc_dev);