[PATCHv2] ARM: msm: Implement read_current_timer for msm timers
From: Stephen Boyd <hidden>
Date: 2012-08-31 00:00:40
Also in:
linux-arm-msm
Subsystem:
arm port, the rest · Maintainers:
Russell King, Linus Torvalds
Setup the same timer used as the clocksource to be used as the read_current_timer implementation. This allows us to support a stable udelay implementation on MSMs where it's possible for the CPUs to scale speeds independently of one another. Signed-off-by: Stephen Boyd <redacted> --- Changes since v1: * Updated for new function signature arch/arm/mach-msm/timer.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)
diff --git a/arch/arm/mach-msm/timer.c b/arch/arm/mach-msm/timer.c
index ce6b008..6e3b91b 100644
--- a/arch/arm/mach-msm/timer.c
+++ b/arch/arm/mach-msm/timer.c@@ -28,6 +28,7 @@ #include <asm/hardware/gic.h> #include <asm/localtimer.h> #include <asm/sched_clock.h> +#include <asm/delay.h> #include "common.h"
@@ -173,6 +174,15 @@ static notrace u32 msm_sched_clock_read(void) return msm_clocksource.read(&msm_clocksource); } +static unsigned long msm_read_current_timer(void) +{ + return msm_clocksource.read(&msm_clocksource); +} + +static struct delay_timer msm_delay_timer = { + .read_current_timer = msm_read_current_timer, +}; + static void __init msm_timer_init(u32 dgt_hz, int sched_bits, int irq, bool percpu) {
@@ -217,6 +227,8 @@ err: if (res) pr_err("clocksource_register failed\n"); setup_sched_clock(msm_sched_clock_read, sched_bits, dgt_hz); + msm_delay_timer.freq = dgt_hz; + register_current_timer_delay(&msm_delay_timer); } #ifdef CONFIG_OF
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