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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>
hifive-unleashed-5.1
Soren Brinkmann 2013-07-08 09:51:38 -07:00 committed by Daniel Lezcano
parent 9bbf914043
commit 3d77b30efc
1 changed files with 12 additions and 0 deletions
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12
drivers/clocksource/cadence_ttc_timer.c
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@ -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,