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Commit 0ef330e1 authored by Marc Zyngier's avatar Marc Zyngier
Browse files

ARM: local timers: introduce a new registration interface 



In order to switch to a runtime selectable local timer,
add a registration interface that timer drivers can use to
register to the core.

local_timer_setup() and local_timer_stop() are made weak symbols
in order not to break existing setups.

Signed-off-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
parent abde710c

arch/arm/include/asm/localtimer.h

+15 −0
Original line number Diff line number Diff line
@@ -15,6 +15,11 @@ 


struct clock_event_device;



struct local_timer_ops {

	int  (*setup)(struct clock_event_device *);

	void (*stop)(struct clock_event_device *);

};



/*

 * Setup a per-cpu timer, whether it be a local timer or dummy broadcast

 */
@@ -38,6 +43,11 @@ void local_timer_stop(struct clock_event_device *); 
 */

int local_timer_setup(struct clock_event_device *);



/*

 * Register a local timer driver

 */

int local_timer_register(struct local_timer_ops *);



#else



static inline int local_timer_setup(struct clock_event_device *evt)
@@ -48,6 +58,11 @@ static inline int local_timer_setup(struct clock_event_device *evt) 
static inline void local_timer_stop(struct clock_event_device *evt)

{

}



static inline int local_timer_register(struct local_timer_ops *ops)

{

	return -ENXIO;

}

#endif



#endif

arch/arm/kernel/smp.c

+27 −0
Original line number Diff line number Diff line
@@ -459,6 +459,33 @@ static void __cpuinit broadcast_timer_setup(struct clock_event_device *evt) 
	clockevents_register_device(evt);

}



static struct local_timer_ops *lt_ops;



#ifdef CONFIG_LOCAL_TIMERS

int local_timer_register(struct local_timer_ops *ops)

{

	if (lt_ops)

		return -EBUSY;



	lt_ops = ops;

	return 0;

}

#endif



int __cpuinit __attribute__ ((weak)) local_timer_setup(struct clock_event_device *clk)

{

	if (lt_ops)

		return lt_ops->setup(clk);



	return -ENXIO;

}



void __attribute__ ((weak)) local_timer_stop(struct clock_event_device *clk)

{

	if (lt_ops)

		lt_ops->stop(clk);

}



void __cpuinit percpu_timer_setup(void)

{

	unsigned int cpu = smp_processor_id();