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| author |   Daniel Lezcano <daniel.lezcano@linaro.org> | 2018-01-08 14:28:58 +0100 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2018-01-08 17:57:26 +0100 |
| commit | 81abdbbffd69fecdac37fe1d2b44a21227ee23d4 (patch) | |
| tree | 811e3ff20654c91bb6d6e6012b8394b892e9786a /drivers/clocksource | |
| parent | clocksource/drivers/stm32: Add clocksource functionality (diff) | |
| download | linux-dev-81abdbbffd69fecdac37fe1d2b44a21227ee23d4.tar.xz linux-dev-81abdbbffd69fecdac37fe1d2b44a21227ee23d4.zip | |
clocksource/drivers/stm32: Add the timer delay callback
Add the timer delay callback, that saves us ~90ms of boot time.
Tested-by: Benjamin Gaignard <benjamin.gaignard@st.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Acked-by: Benjamin Gaignard <benjamin.gaignard@st.com>
Cc: Alexandre Torgue <alexandre.torgue@st.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1515418139-23276-19-git-send-email-daniel.lezcano@linaro.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'drivers/clocksource')
| -rw-r--r-- | drivers/clocksource/timer-stm32.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/clocksource/timer-stm32.c b/drivers/clocksource/timer-stm32.c index 21b7492c963a..c7d1dae27067 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, |