diff options
author | Rabin Vincent <rabin.vincent@axis.com> | 2015-08-19 16:43:38 +0300 |
---|---|---|
committer | Daniel Lezcano <daniel.lezcano@linaro.org> | 2016-02-25 16:34:04 +0300 |
commit | bbaa06702719818913ed686612d0db477b2b53b0 (patch) | |
tree | edf9978a89a9ec0b7968bbfaf0a61e9395d434c9 /drivers | |
parent | 1b18fd2023acf7679a79d94ee85d488664ef0553 (diff) | |
download | linux-bbaa06702719818913ed686612d0db477b2b53b0.tar.xz |
clocksource/drivers/arm_global_timer: Register delay timer
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 <rabin.vincent@axis.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/clocksource/arm_global_timer.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/clocksource/arm_global_timer.c b/drivers/clocksource/arm_global_timer.c index d189d8cb69f7..36998fa18845 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; |