linux-kernel - [PATCH v2 2/2] clocksource/cadence_ttc: Reuse clocksource as sched

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Date:	Mon,  8 Jul 2013 09:51:38 -0700
From:	Soren Brinkmann <soren.brinkmann@...inx.com>
To:	John Stultz <john.stultz@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Baruch Siach <baruch@...s.co.il>
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Michal Simek <michal.simek@...inx.com>,
	Soren Brinkmann <soren.brinkmann@...inx.com>
Subject: [PATCH v2 2/2] clocksource/cadence_ttc: Reuse clocksource as sched_clock

Reuse the TTC clocksource timer as sched clock provider.

Signed-off-by: Soren Brinkmann <soren.brinkmann@...inx.com>
---
v2:
 - #include linux/sched_clock.h instead of asm/sched_clock.h
 - remove Kconfig options and #ifdefs around sched_clock related code
    The reasons for having those are obsolete, since ARM deprecated its
    custom sched_clock framework and migrated to the common one.

 drivers/clocksource/cadence_ttc_timer.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/clocksource/cadence_ttc_timer.c b/drivers/clocksource/cadence_ttc_timer.c
index 0eefc8d..b2bb3a4b 100644
--- a/drivers/clocksource/cadence_ttc_timer.c
+++ b/drivers/clocksource/cadence_ttc_timer.c
@@ -21,6 +21,7 @@
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
 #include <linux/slab.h>
+#include <linux/sched_clock.h>
 
 /*
  * This driver configures the 2 16-bit count-up timers as follows:
@@ -94,6 +95,8 @@ struct ttc_timer_clockevent {
 #define to_ttc_timer_clkevent(x) \
 		container_of(x, struct ttc_timer_clockevent, ce)
 
+static void __iomem *ttc_sched_clock_val_reg;
+
 /**
  * ttc_set_interval - Set the timer interval value
  *
@@ -155,6 +158,11 @@ static cycle_t __ttc_clocksource_read(struct clocksource *cs)
 				TTC_COUNT_VAL_OFFSET);
 }
 
+static u32 notrace ttc_sched_clock_read(void)
+{
+	return __raw_readl(ttc_sched_clock_val_reg);
+}
+
 /**
  * ttc_set_next_event - Sets the time interval for next event
  *
@@ -296,6 +304,10 @@ static void __init ttc_setup_clocksource(struct clk *clk, void __iomem *base)
 		kfree(ttccs);
 		return;
 	}
+
+	ttc_sched_clock_val_reg = base + TTC_COUNT_VAL_OFFSET;
+	setup_sched_clock(ttc_sched_clock_read, 16,
+			clk_get_rate(ttccs->ttc.clk) / PRESCALE);
 }
 
 static int ttc_rate_change_clockevent_cb(struct notifier_block *nb,
-- 
1.8.3.2

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