[PATCH] clocksource: arm_global_timer: register delay timer

[PATCH] clocksource: arm_global_timer: register delay timer

[Rabin Vincent]

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>
---
 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 e683377..f92a77d 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>
@@ -208,6 +209,21 @@ 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);
@@ -304,6 +320,7 @@ 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;
 
-- 
1.7.10.4

[PATCH] clocksource: arm_global_timer: register delay timer

[Daniel Lezcano]

On 08/19/2015 03:43 PM, Rabin Vincent wrote:
> 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>

Applied to my tree for 4.4

Thanks !

   -- Daniel

-- 
  <http://www.linaro.org/> Linaro.org ? Open source software for ARM SoCs

Follow Linaro:  <http://www.facebook.com/pages/Linaro> Facebook |
<http://twitter.com/#!/linaroorg> Twitter |
<http://www.linaro.org/linaro-blog/> Blog

[PATCH] clocksource: arm_global_timer: register delay timer

[Rabin Vincent]

On Thu, Aug 20, 2015 at 09:03:04PM +0200, Daniel Lezcano wrote:
> On 08/19/2015 03:43 PM, Rabin Vincent wrote:
> > 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>
> 
> Applied to my tree for 4.4

This seems to have got lost?  I don't see it in v4.4 or current mainline
(v4.5-rc4).  It still applies cleanly.

Thanks.

[PATCH] clocksource: arm_global_timer: register delay timer

[Daniel Lezcano]

On 02/16/2016 11:28 AM, Rabin Vincent wrote:
> On Thu, Aug 20, 2015 at 09:03:04PM +0200, Daniel Lezcano wrote:
>> On 08/19/2015 03:43 PM, Rabin Vincent wrote:
>>> 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>
>>
>> Applied to my tree for 4.4
>
> This seems to have got lost?  I don't see it in v4.4 or current mainline
> (v4.5-rc4).  It still applies cleanly.

Oops, right.

Fixed now [1]. Thanks for the heads up.

   -- Daniel

[1] 
https://git.linaro.org/people/daniel.lezcano/linux.git/commit/23cb25d0f407e83be10747258092843e8e20d535

-- 
  <http://www.linaro.org/> Linaro.org ? Open source software for ARM SoCs

Follow Linaro:  <http://www.facebook.com/pages/Linaro> Facebook |
<http://twitter.com/#!/linaroorg> Twitter |
<http://www.linaro.org/linaro-blog/> Blog