[PATCH v2 28/31] arm64: Generic timers support
From: Santosh Shilimkar <hidden>
Date: 2012-08-17 10:21:29
Also in:
linux-arch, lkml
On Tuesday 14 August 2012 11:22 PM, Catalin Marinas wrote:
From: Marc Zyngier<redacted> This patch adds support for the ARM generic timers with A64 instructions for accessing the timer registers. It uses the physical counter as the clock source and the virtual counter as sched_clock. The timer frequency can be specified via DT or read from the CNTFRQ_EL0 register. The physical counter is also accessible from user space allowing fast gettimeofday() implementation. Signed-off-by: Marc Zyngier<redacted> Signed-off-by: Will Deacon<redacted> Signed-off-by: Catalin Marinas<catalin.marinas@arm.com> ---
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diff --git a/drivers/clocksource/arm_generic.c b/drivers/clocksource/arm_generic.c new file mode 100644 index 0000000..05c898c --- /dev/null +++ b/drivers/clocksource/arm_generic.c
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+ +static void __cpuinit arch_timer_setup(struct clock_event_device *clk) +{ + /* Let's make sure the timer is off before doing anything else */ + arch_timer_stop(); + + clk->features = CLOCK_EVT_FEAT_ONESHOT;
Are these CPU timers wakeup capable or we need the wakeup capable broadcast timer for low power wakeups ? In that case C3STOP would be needed here. Regards santosh