diff options
| author | Soren Brinkmann <soren.brinkmann@xilinx.com> | 2013-07-08 09:51:38 -0700 |
|---|---|---|
| committer | Daniel Lezcano <daniel.lezcano@linaro.org> | 2013-07-18 15:27:34 +0200 |
| commit | 3d77b30efc72d126c2b74070b41a03869611228d (patch) | |
| tree | afb1f066786838338bac582aca8ddc8983449120 /drivers/clocksource | |
| parent | 9bbf914043e04f65e619f3c0ff67c387812f9458 (diff) | |
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.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/clocksource/cadence_ttc_timer.c b/drivers/clocksource/cadence_ttc_timer.c index 0eefc8d8622..b2bb3a4bc20 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, |