lkml.org 
[lkml]   [2018]   [Jan]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 11/12] clocksource/drivers/stm32: Add the timer delay
Date
Add the timer delay, that saves us ~90ms of boot time.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
---
drivers/clocksource/timer-stm32.c | 13 +++++++++++++
1 file changed, 13 insertions(+)

diff --git a/drivers/clocksource/timer-stm32.c b/drivers/clocksource/timer-stm32.c
index 4634f4d..dcf8445 100644
--- a/drivers/clocksource/timer-stm32.c
+++ b/drivers/clocksource/timer-stm32.c
@@ -9,6 +9,7 @@
#include <linux/kernel.h>
#include <linux/clocksource.h>
#include <linux/clockchips.h>
+#include <linux/delay.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/of.h>
@@ -88,6 +89,13 @@ static u64 notrace stm32_read_sched_clock(void)
return readl_relaxed(stm32_timer_cnt);
}

+static struct delay_timer stm32_timer_delay;
+
+static unsigned long stm32_read_delay(void)
+{
+ return readl_relaxed(stm32_timer_cnt);
+}
+
static void stm32_clock_event_disable(struct timer_of *to)
{
writel_relaxed(0, timer_of_base(to) + TIM_DIER);
@@ -230,6 +238,11 @@ static int __init stm32_clocksource_init(struct timer_of *to)
stm32_timer_cnt = timer_of_base(to) + TIM_CNT;
sched_clock_register(stm32_read_sched_clock, bits, timer_of_rate(to));
pr_info("%s: STM32 sched_clock registered\n", name);
+
+ stm32_timer_delay.read_current_timer = stm32_read_delay;
+ stm32_timer_delay.freq = timer_of_rate(to);
+ register_current_timer_delay(&stm32_timer_delay);
+ pr_info("%s: STM32 delay timer registered\n", name);
}

return clocksource_mmio_init(timer_of_base(to) + TIM_CNT, name,
--
2.7.4
\
 
 \ /
  Last update: 2018-01-04 13:53    [W:0.078 / U:0.156 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site