From: Mikael Pettersson <mikpe@it.uu.se>
Date: Sat, 9 Jan 2010 12:03:59 +0000 (+0100)
Subject: ARM: 5869/1: ixp4xx: implement sched_clock()
X-Git-Tag: firefly_0821_release~9833^2~3063^2~4^5
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=e00d9d4b1796dae3adf6e39c9a766e760dd1c796;p=firefly-linux-kernel-4.4.55.git

ARM: 5869/1: ixp4xx: implement sched_clock()

Add a better sched_clock() to the ixp4xx platform,
implemented via its clocksource support.

This is based on the sched_clock() I implemented for
the IOP platform. Tested on a ds101 ixp420 machine.

Signed-off-by: Mikael Pettersson <mikpe@it.uu.se>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---

diff --git a/arch/arm/mach-ixp4xx/common.c b/arch/arm/mach-ixp4xx/common.c
index 3bbf40f6d964..71728d36d501 100644
--- a/arch/arm/mach-ixp4xx/common.c
+++ b/arch/arm/mach-ixp4xx/common.c
@@ -426,6 +426,17 @@ static void __init ixp4xx_clocksource_init(void)
 	clocksource_register(&clocksource_ixp4xx);
 }
 
+/*
+ * sched_clock()
+ */
+unsigned long long sched_clock(void)
+{
+	cycle_t cyc = ixp4xx_get_cycles(NULL);
+	struct clocksource *cs = &clocksource_ixp4xx;
+
+	return clocksource_cyc2ns(cyc, cs->mult, cs->shift);
+}
+
 /*
  * clockevents
  */