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ARM: local timers: introduce a new registration interface

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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: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Marc Zyngier 2012-01-10 19:26:45 +00:00
parent abde710ca8
commit 0ef330e10d
2 changed files with 42 additions and 0 deletions
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15
arch/arm/include/asm/localtimer.h
View File

@ -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

27
arch/arm/kernel/smp.c
View File

@ -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();