From: 黄涛 <huangtao@rock-chips.com>
Date: Tue, 22 Jan 2013 03:30:13 +0000 (+0800)
Subject: rk_timer: support sched_clock
X-Git-Tag: firefly_0821_release~7869
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=d00b3197688e89b12ec3b8f601f8bae8974854f4;p=firefly-linux-kernel-4.4.55.git

rk_timer: support sched_clock
---

diff --git a/arch/arm/plat-rk/rk_timer.c b/arch/arm/plat-rk/rk_timer.c
index 24dc1b508ce8..51e5e5934b8d 100644
--- a/arch/arm/plat-rk/rk_timer.c
+++ b/arch/arm/plat-rk/rk_timer.c
@@ -282,3 +282,18 @@ int local_timer_ack(void)
 	return 0;
 }
 #endif
+
+/*
+ * Scheduler clock - returns current time in nanosec units.
+ */
+unsigned long long notrace sched_clock(void)
+{
+	const struct clocksource *cs = &rk_timer_clocksource;
+	cycle_t cyc;
+
+	if (!timer.cs_base)
+		return 0;
+
+	cyc = ~rk_timer_read_current_value(timer.cs_base);
+	return clocksource_cyc2ns(cyc, cs->mult, cs->shift);
+}