linux-kernel - [PATCHv2 2/8] clocksource: sun4i: Add clocksource and sched clock drivers

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Date:	Fri, 28 Jun 2013 21:56:20 +0200
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	John Stultz <john.stultz@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Emilio Lopez <emilio@...pez.com.ar>, kevin@...winnertech.com,
	sunny@...winnertech.com, shuge@...winnertech.com,
	linux-sunxi@...glegroups.com,
	Maxime Ripard <maxime.ripard@...e-electrons.com>
Subject: [PATCHv2 2/8] clocksource: sun4i: Add clocksource and sched clock drivers

Use the second timer found on the Allwinner SoCs as a clock source and
sched clock, that were both not used yet on these platforms.

Signed-off-by: Maxime Ripard <maxime.ripard@...e-electrons.com>
---
 drivers/clocksource/sun4i_timer.c | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/drivers/clocksource/sun4i_timer.c b/drivers/clocksource/sun4i_timer.c
index bdf34d9..050e94f 100644
--- a/drivers/clocksource/sun4i_timer.c
+++ b/drivers/clocksource/sun4i_timer.c
@@ -19,6 +19,7 @@
 #include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <linux/irqreturn.h>
+#include <linux/sched_clock.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
@@ -33,8 +34,6 @@
 #define TIMER_INTVAL_REG(val)	(0x10 * val + 0x14)
 #define TIMER_CNTVAL_REG(val)	(0x10 * val + 0x18)
 
-#define TIMER_SCAL		16
-
 static void __iomem *timer_base;
 
 static void sun4i_clkevt_mode(enum clock_event_mode mode,
@@ -96,6 +95,11 @@ static struct irqaction sun4i_timer_irq = {
 	.dev_id = &sun4i_clockevent,
 };
 
+static u32 sun4i_timer_sched_read(void)
+{
+	return ~readl(timer_base + TIMER_CNTVAL_REG(1));
+}
+
 static void __init sun4i_timer_init(struct device_node *node)
 {
 	unsigned long rate = 0;
@@ -143,6 +147,15 @@ static void __init sun4i_timer_init(struct device_node *node)
 
 	clockevents_config_and_register(&sun4i_clockevent, rate / TIMER_SCAL,
 					0x1, 0xff);
+
+	writel(~0, timer_base + TIMER_INTVAL_REG(1));
+	writel(TIMER_CTL_ENABLE | TIMER_CTL_AUTORELOAD | TIMER_CTL_CLK_SRC(TIMER_CTL_CLK_SRC_OSC24M),
+	       timer_base + TIMER_CTL_REG(1));
+
+	setup_sched_clock(sun4i_timer_sched_read, 32, clk_get_rate(clk));
+	clocksource_mmio_init(timer_base + TIMER_CNTVAL_REG(1), node->name,
+			      clk_get_rate(clk), 300, 32,
+			      clocksource_mmio_readl_down);
 }
 CLOCKSOURCE_OF_DECLARE(sun4i, "allwinner,sun4i-timer",
 		       sun4i_timer_init);
-- 
1.8.3.1

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