Signed-off-by: Paul Cercueil <p...@crapouillou.net>
---
drivers/rtc/rtc-jz4740.c | 77 ++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 77 insertions(+)
diff --git a/drivers/rtc/rtc-jz4740.c b/drivers/rtc/rtc-jz4740.c
index 3914b1c..f53cfd6 100644
--- a/drivers/rtc/rtc-jz4740.c
+++ b/drivers/rtc/rtc-jz4740.c
@@ -14,11 +14,13 @@
*
*/
+#include <linux/clk.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
+#include <linux/reboot.h>
#include <linux/rtc.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
@@ -28,6 +30,8 @@
#define JZ_REG_RTC_SEC_ALARM 0x08
#define JZ_REG_RTC_REGULATOR 0x0C
#define JZ_REG_RTC_HIBERNATE 0x20
+#define JZ_REG_RTC_WAKEUP_FILTER 0x24
+#define JZ_REG_RTC_RESET_COUNTER 0x28
#define JZ_REG_RTC_SCRATCHPAD 0x34
/* The following are present on the jz4780 */
@@ -45,6 +49,9 @@
/* Magic value to enable writes on jz4780 */
#define JZ_RTC_WENR_MAGIC 0xA55A
+#define JZ_RTC_WAKEUP_FILTER_MASK 0x0000FFE0
+#define JZ_RTC_RESET_COUNTER_MASK 0x00000FE0
+
enum jz4740_rtc_type {
ID_JZ4740,
ID_JZ4780,
@@ -59,8 +66,13 @@ struct jz4740_rtc {
int irq;
spinlock_t lock;
+
+ unsigned int min_wakeup_pin_assert_time;
+ unsigned int reset_pin_assert_time;
};
+static struct device *dev_for_power_off;
+
static inline uint32_t jz4740_rtc_reg_read(struct jz4740_rtc *rtc, size_t reg)
{
return readl(rtc->base + reg);
@@ -246,6 +258,49 @@ void jz4740_rtc_poweroff(struct device *dev)
}
EXPORT_SYMBOL_GPL(jz4740_rtc_poweroff);
+static void jz4740_rtc_power_off(void)
+{
+ struct jz4740_rtc *rtc = dev_get_drvdata(dev_for_power_off);
+ unsigned long wakeup_filter_ticks;
+ unsigned long reset_counter_ticks;
+ struct clk *rtc_clk;
+ unsigned long rtc_rate;
+
+ rtc_clk = clk_get(dev_for_power_off, "rtc");
+ if (IS_ERR(rtc_clk))
+ panic("unable to get RTC clock");
+ rtc_rate = clk_get_rate(rtc_clk);
+ clk_put(rtc_clk);
+
+ /*
+ * Set minimum wakeup pin assertion time: 100 ms.
+ * Range is 0 to 2 sec if RTC is clocked at 32 kHz.
+ */
+ wakeup_filter_ticks =
+ (rtc->min_wakeup_pin_assert_time * rtc_rate) / 1000;
+ if (wakeup_filter_ticks < JZ_RTC_WAKEUP_FILTER_MASK)
+ wakeup_filter_ticks &= JZ_RTC_WAKEUP_FILTER_MASK;
+ else
+ wakeup_filter_ticks = JZ_RTC_WAKEUP_FILTER_MASK;
+ jz4740_rtc_reg_write(rtc,
+ JZ_REG_RTC_WAKEUP_FILTER, wakeup_filter_ticks);
+
+ /*
+ * Set reset pin low-level assertion time after wakeup: 60 ms.
+ * Range is 0 to 125 ms if RTC is clocked at 32 kHz.
+ */
+ reset_counter_ticks = (rtc->reset_pin_assert_time * rtc_rate) / 1000;
+ if (reset_counter_ticks < JZ_RTC_RESET_COUNTER_MASK)
+ reset_counter_ticks &= JZ_RTC_RESET_COUNTER_MASK;
+ else
+ reset_counter_ticks = JZ_RTC_RESET_COUNTER_MASK;
+ jz4740_rtc_reg_write(rtc,
+ JZ_REG_RTC_RESET_COUNTER, reset_counter_ticks);
+
+ jz4740_rtc_poweroff(dev_for_power_off);
+ machine_halt();
+}
+
static const struct of_device_id jz4740_rtc_of_match[] = {
{ .compatible = "ingenic,jz4740-rtc", .data = (void *) ID_JZ4740 },
{ .compatible = "ingenic,jz4780-rtc", .data = (void *) ID_JZ4780 },
@@ -314,6 +369,28 @@ static int jz4740_rtc_probe(struct platform_device *pdev)
}
}
+ if (of_device_is_system_power_controller(pdev->dev.of_node)) {
+ if (!pm_power_off) {
+ /* Default: 60ms */
+ rtc->reset_pin_assert_time = 60;
+ device_property_read_u32(&pdev->dev,
+ "reset-pin-assert-time",
+ &rtc->reset_pin_assert_time);
+
+ /* Default: 100ms */
+ rtc->min_wakeup_pin_assert_time = 100;
+ device_property_read_u32(&pdev->dev,
+ "min-wakeup-pin-assert-time",
+ &rtc->min_wakeup_pin_assert_time);
+
+ dev_for_power_off = &pdev->dev;
+ pm_power_off = jz4740_rtc_power_off;
+ } else {
+ dev_err(&pdev->dev,
+ "Poweroff handler already present!\n");
+ }
+ }
+
return 0;
}
--
2.7.0
