[v3,11/13] clocksource/drivers/rockchip_timer: implement reading 64bit value from timer
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Message ID 1480427118-5126-12-git-send-email-al.kochet@gmail.com
State New
Headers show

Commit Message

Alexander Kochetkov Nov. 29, 2016, 1:45 p.m. UTC
Signed-off-by: Alexander Kochetkov <al.kochet@gmail.com>
---
 drivers/clocksource/rockchip_timer.c |   21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

Patch
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diff --git a/drivers/clocksource/rockchip_timer.c b/drivers/clocksource/rockchip_timer.c
index c2b0454..6224aa9 100644
--- a/drivers/clocksource/rockchip_timer.c
+++ b/drivers/clocksource/rockchip_timer.c
@@ -19,6 +19,8 @@ 
 
 #define TIMER_LOAD_COUNT0	0x00
 #define TIMER_LOAD_COUNT1	0x04
+#define TIMER_CURRENT_VALUE0	0x08
+#define TIMER_CURRENT_VALUE1	0x0C
 #define TIMER_CONTROL_REG3288	0x10
 #define TIMER_CONTROL_REG3399	0x1c
 #define TIMER_INT_STATUS	0x18
@@ -72,6 +74,25 @@  static void rk_timer_update_counter(u64 cycles, struct rk_timer *timer)
 	writel_relaxed(upper, timer->base + TIMER_LOAD_COUNT1);
 }
 
+static u64 rk_timer_counter_read(struct rk_timer *timer)
+{
+	u64 counter;
+	u32 lower;
+	u32 upper, old_upper;
+
+	upper = readl_relaxed(timer->base + TIMER_CURRENT_VALUE1);
+	do {
+		old_upper = upper;
+		lower = readl_relaxed(timer->base + TIMER_CURRENT_VALUE0);
+		upper = readl_relaxed(timer->base + TIMER_CURRENT_VALUE1);
+	} while (upper != old_upper);
+
+	counter = upper;
+	counter <<= 32;
+	counter |= lower;
+	return counter;
+}
+
 static void rk_timer_interrupt_clear(struct rk_timer *timer)
 {
 	writel_relaxed(1, timer->base + TIMER_INT_STATUS);