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authorSoren Brinkmann <soren.brinkmann@xilinx.com>2013-07-08 20:51:38 +0400
committerDaniel Lezcano <daniel.lezcano@linaro.org>2013-07-18 17:27:34 +0400
commit3d77b30efc72d126c2b74070b41a03869611228d (patch)
treeafb1f066786838338bac582aca8ddc8983449120 /drivers/clocksource
parent9bbf914043e04f65e619f3c0ff67c387812f9458 (diff)
downloadlinux-3d77b30efc72d126c2b74070b41a03869611228d.tar.xz
clocksource: cadence_ttc: Reuse clocksource as sched_clock
Reuse the TTC clocksource timer as sched clock provider. Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Acked-by: Michal Simek <monstr@monstr.eu>
Diffstat (limited to 'drivers/clocksource')
-rw-r--r--drivers/clocksource/cadence_ttc_timer.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/clocksource/cadence_ttc_timer.c b/drivers/clocksource/cadence_ttc_timer.c
index 0eefc8d8622b..b2bb3a4bc205 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,