Commit-ID: bbaa06702719818913ed686612d0db477b2b53b0
Gitweb: http://git.kernel.org/tip/bbaa06702719818913ed686612d0db477b2b53b0
Author: Rabin Vincent <rabin.vincent@xxxxxxxx>
AuthorDate: Wed, 19 Aug 2015 15:43:38 +0200
Committer: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
CommitDate: Thu, 25 Feb 2016 14:34:04 +0100
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@xxxxxxxx>
Signed-off-by: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
---
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;
--
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