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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>
This commit is contained in:
Rabin Vincent 2015-08-19 15:43:38 +02:00 committed by Daniel Lezcano
parent 1b18fd2023
commit bbaa067027
1 changed files with 17 additions and 0 deletions
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17
drivers/clocksource/arm_global_timer.c
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@ -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(&gt_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;