From: Rabin Vincent <[email protected]> Provide a delay timer using the lower 32-bits of the global timer so that we can use that instead of having to calibrating delays.
Signed-off-by: Rabin Vincent <[email protected]> Signed-off-by: Daniel Lezcano <[email protected]> --- drivers/clocksource/arm_global_timer.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/drivers/clocksource/arm_global_timer.c b/drivers/clocksource/arm_global_timer.c index d189d8c..36998fa 100644 --- a/drivers/clocksource/arm_global_timer.c +++ b/drivers/clocksource/arm_global_timer.c @@ -16,6 +16,7 @@ #include <linux/clockchips.h> #include <linux/cpu.h> #include <linux/clk.h> +#include <linux/delay.h> #include <linux/err.h> #include <linux/io.h> #include <linux/of.h> @@ -221,6 +222,21 @@ static u64 notrace gt_sched_clock_read(void) } #endif +static unsigned long gt_read_long(void) +{ + return readl_relaxed(gt_base + GT_COUNTER0); +} + +static struct delay_timer gt_delay_timer = { + .read_current_timer = gt_read_long, +}; + +static void __init gt_delay_timer_init(void) +{ + gt_delay_timer.freq = gt_clk_rate; + register_current_timer_delay(>_delay_timer); +} + static void __init gt_clocksource_init(void) { writel(0, gt_base + GT_CONTROL); @@ -317,6 +333,7 @@ static void __init global_timer_of_register(struct device_node *np) /* Immediately configure the timer on the boot CPU */ gt_clocksource_init(); gt_clockevents_init(this_cpu_ptr(gt_evt)); + gt_delay_timer_init(); return; -- 1.9.1
