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author | Marc Zyngier <marc.zyngier@arm.com> | 2012-01-10 19:26:45 +0000 |
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committer | Marc Zyngier <marc.zyngier@arm.com> | 2012-03-13 13:27:50 +0000 |
commit | 0ef330e10dcdbca8f4566e9eaf77015f8ce039d3 (patch) | |
tree | b6adfb473921a37bf73372dd3dfec23a1e450d67 /arch | |
parent | abde710ca8776f851e41c3dfe78ad7dcafa26dc9 (diff) | |
download | op-kernel-dev-0ef330e10dcdbca8f4566e9eaf77015f8ce039d3.zip op-kernel-dev-0ef330e10dcdbca8f4566e9eaf77015f8ce039d3.tar.gz |
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: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'arch')
-rw-r--r-- | arch/arm/include/asm/localtimer.h | 15 | ||||
-rw-r--r-- | arch/arm/kernel/smp.c | 27 |
2 files changed, 42 insertions, 0 deletions
diff --git a/arch/arm/include/asm/localtimer.h b/arch/arm/include/asm/localtimer.h index 7e1b2c5..f088d63 100644 --- a/arch/arm/include/asm/localtimer.h +++ b/arch/arm/include/asm/localtimer.h @@ -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 diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c index cdeb727..89bb02c 100644 --- a/arch/arm/kernel/smp.c +++ b/arch/arm/kernel/smp.c @@ -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(); |