linux-kernel - [PATCH 2/4] clocksource: sp804: introduce helper sp804_load_mode

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Date:	Sat, 28 May 2016 17:33:51 +0800
From:	Kefeng Wang <wangkefeng.wang@...wei.com>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Rob Herring <robh+dt@...nel.org>
CC:	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <guohanjun@...wei.com>,
	<wangkefeng.wang@...wei.com>, Sudeep Holla <sudeep.holla@....com>,
	Arnd Bergmann <arnd@...db.de>, <xuwei5@...ilicon.com>
Subject: [PATCH 2/4] clocksource: sp804: introduce helper sp804_load_mode_set()

Introduce helper sp804_load_mode_set(), and use it, prepare for 64bit
mode timer support.

Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
---
 drivers/clocksource/timer-sp804.c | 27 +++++++++++++--------------
 1 file changed, 13 insertions(+), 14 deletions(-)

diff --git a/drivers/clocksource/timer-sp804.c b/drivers/clocksource/timer-sp804.c
index 362e5d0..b8848e5 100644
--- a/drivers/clocksource/timer-sp804.c
+++ b/drivers/clocksource/timer-sp804.c
@@ -73,6 +73,15 @@ static long __init sp804_get_clock_rate(struct clk *clk, const char *name)
 	return rate;
 }
 
+static inline void sp804_load_mode_set(void __iomem *base, unsigned long load, int mode)
+{
+	unsigned long ctrl = TIMER_CTRL_32BIT | TIMER_CTRL_IE |
+			     mode | TIMER_CTRL_ENABLE;
+
+	writel(load, base + TIMER_LOAD);
+	writel(ctrl, base + TIMER_CTRL);
+}
+
 static void __iomem *sched_clock_base;
 
 static u64 notrace sp804_read(void)
@@ -97,10 +106,8 @@ void __init __sp804_clocksource_and_sched_clock_init(void __iomem *base,
 
 	/* setup timer 0 as free-running clocksource */
 	writel(0, base + TIMER_CTRL);
-	writel(0xffffffff, base + TIMER_LOAD);
 	writel(0xffffffff, base + TIMER_VALUE);
-	writel(TIMER_CTRL_32BIT | TIMER_CTRL_ENABLE | TIMER_CTRL_PERIODIC,
-		base + TIMER_CTRL);
+	sp804_load_mode_set(base, 0xffffffff, TIMER_CTRL_PERIODIC & ~TIMER_CTRL_IE);
 
 	clocksource_mmio_init(base + TIMER_VALUE, name,
 		rate, 200, 32, clocksource_mmio_readl_down);
@@ -143,24 +150,16 @@ static int sp804_shutdown(struct clock_event_device *evt)
 
 static int sp804_set_periodic(struct clock_event_device *evt)
 {
-	unsigned long ctrl = TIMER_CTRL_32BIT | TIMER_CTRL_IE |
-			     TIMER_CTRL_PERIODIC | TIMER_CTRL_ENABLE;
-
 	timer_shutdown(evt);
-	writel(clkevt_reload, clkevt_base + TIMER_LOAD);
-	writel(ctrl, clkevt_base + TIMER_CTRL);
+	sp804_load_mode_set(clkevt_base, clkevt_reload, TIMER_CTRL_PERIODIC);
 	return 0;
 }
 
 static int sp804_set_next_event(unsigned long next,
-	struct clock_event_device *evt)
+				struct clock_event_device *evt)
 {
-	unsigned long ctrl = TIMER_CTRL_32BIT | TIMER_CTRL_IE |
-			     TIMER_CTRL_ONESHOT | TIMER_CTRL_ENABLE;
-
-	writel(next, clkevt_base + TIMER_LOAD);
-	writel(ctrl, clkevt_base + TIMER_CTRL);
 
+	sp804_load_mode_set(clkevt_base, next, TIMER_CTRL_ONESHOT);
 	return 0;
 }
 
-- 
1.7.12.4