linux-kernel - [PATCH 3/3] ARM:Gemini:setup timer3 as free running timer

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Message-Id: <1439323745-8542-4-git-send-email-ulli.kroll@googlemail.com>
Date:	Tue, 11 Aug 2015 22:09:05 +0200
From:	Hans Ulli Kroll <ulli.kroll@...glemail.com>
To:	Olof Johansson <olof@...om.net>
Cc:	arm@...nel.org, linux-kernel@...r.kernel.org,
	Arnd Bergmann <arnd@...db.de>, Roman Yeryomin <roman@...em.lv>,
	linus.walleij@...aro.org,
	Hans Ulli Kroll <ulli.kroll@...glemail.com>
Subject: [PATCH 3/3] ARM:Gemini:setup timer3 as free running timer

In the original driver it is missed to setup a free running driver.
This timer is needed for the scheduler.
So setup it.

Signed-off-by: Hans Ulli Kroll <ulli.kroll@...glemail.com>
---
 arch/arm/mach-gemini/time.c | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/arch/arm/mach-gemini/time.c b/arch/arm/mach-gemini/time.c
index 5e2b1ba..f5f18df 100644
--- a/arch/arm/mach-gemini/time.c
+++ b/arch/arm/mach-gemini/time.c
@@ -15,6 +15,7 @@
 #include <asm/mach/time.h>
 #include <linux/clockchips.h>
 #include <linux/clocksource.h>
+#include <linux/sched_clock.h>
 
 /*
  * Register definitions for the timers
@@ -62,6 +63,11 @@
 
 static unsigned int tick_rate;
 
+static u64 notrace gemini_read_sched_clock(void)
+{
+	return readl(TIMER_COUNT(TIMER3_BASE));
+}
+
 static int gemini_timer_set_next_event(unsigned long cycles,
 				       struct clock_event_device *evt)
 {
@@ -206,8 +212,21 @@ void __init gemini_timer_init(void)
 	writel(TIMER_DEFAULT_FLAGS, TIMER_CR);
 
 	/*
-	 * Setup clockevent timer (interrupt-driven.)
+	 * Setup free-running clocksource timer (interrupts
+	 * disabled.)
 	 */
+	writel(0, TIMER_COUNT(TIMER3_BASE));
+	writel(0, TIMER_LOAD(TIMER3_BASE));
+	writel(0, TIMER_MATCH1(TIMER3_BASE));
+	writel(0, TIMER_MATCH2(TIMER3_BASE));
+	clocksource_mmio_init(TIMER_COUNT(TIMER3_BASE),
+			      "gemini_clocksource", tick_rate,
+			      300, 32, clocksource_mmio_readl_up);
+	sched_clock_register(gemini_read_sched_clock, 32, tick_rate);
+
+	/*
+	 * Setup clockevent timer (interrupt-driven.)
+	*/
 	writel(0, TIMER_COUNT(TIMER1_BASE));
 	writel(0, TIMER_LOAD(TIMER1_BASE));
 	writel(0, TIMER_MATCH1(TIMER1_BASE));
-- 
2.4.6

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