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authorRabin Vincent <rabin.vincent@axis.com>2015-08-19 16:43:38 +0300
committerDaniel Lezcano <daniel.lezcano@linaro.org>2016-02-25 16:34:04 +0300
commitbbaa06702719818913ed686612d0db477b2b53b0 (patch)
treeedf9978a89a9ec0b7968bbfaf0a61e9395d434c9 /drivers/clocksource
parent1b18fd2023acf7679a79d94ee85d488664ef0553 (diff)
downloadlinux-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/clocksource')
-rw-r--r--drivers/clocksource/arm_global_timer.c17
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(&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;