diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/Kconfig | 5 | ||||
| -rw-r--r-- | arch/arm/kernel/smp.c | 10 | ||||
| -rw-r--r-- | arch/arm/mach-realview/Makefile | 3 | ||||
| -rw-r--r-- | arch/arm/mach-realview/core.c | 10 | ||||
| -rw-r--r-- | arch/arm/mach-realview/localtimer.c | 39 | ||||
| -rw-r--r-- | arch/arm/mach-realview/platsmp.c | 6 |
6 files changed, 64 insertions, 9 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index b82828e..a0aeecc 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -33,6 +33,11 @@ config GENERIC_CLOCKEVENTS bool default n +config GENERIC_CLOCKEVENTS_BROADCAST + bool + depends on GENERIC_CLOCKEVENTS + default y if SMP && !LOCAL_TIMERS + config MMU bool default y diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c index aef6f9a..e9dfbab 100644 --- a/arch/arm/kernel/smp.c +++ b/arch/arm/kernel/smp.c @@ -290,6 +290,11 @@ asmlinkage void __cpuinit secondary_start_kernel(void) local_irq_enable(); local_fiq_enable(); + /* + * Setup local timer for this CPU. + */ + local_timer_setup(cpu); + calibrate_delay(); smp_store_cpu_info(cpu); @@ -300,11 +305,6 @@ asmlinkage void __cpuinit secondary_start_kernel(void) cpu_set(cpu, cpu_online_map); /* - * Setup local timer for this CPU. - */ - local_timer_setup(cpu); - - /* * OK, it's off to the idle thread for us */ cpu_idle(); diff --git a/arch/arm/mach-realview/Makefile b/arch/arm/mach-realview/Makefile index 36e76ba..ca1e390 100644 --- a/arch/arm/mach-realview/Makefile +++ b/arch/arm/mach-realview/Makefile @@ -4,6 +4,5 @@ obj-y := core.o clock.o obj-$(CONFIG_MACH_REALVIEW_EB) += realview_eb.o -obj-$(CONFIG_SMP) += platsmp.o headsmp.o +obj-$(CONFIG_SMP) += platsmp.o headsmp.o localtimer.o obj-$(CONFIG_HOTPLUG_CPU) += hotplug.o -obj-$(CONFIG_LOCAL_TIMERS) += localtimer.o diff --git a/arch/arm/mach-realview/core.c b/arch/arm/mach-realview/core.c index 6c68dee..8cabfec 100644 --- a/arch/arm/mach-realview/core.c +++ b/arch/arm/mach-realview/core.c @@ -596,12 +596,20 @@ static void __init realview_clocksource_init(void) } /* - * Set up timer interrupt, and return the current time in seconds. + * Set up the clock source and clock events devices */ static void __init realview_timer_init(void) { u32 val; +#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST + /* + * The dummy clock device has to be registered before the main device + * so that the latter will broadcast the clock events + */ + local_timer_setup(smp_processor_id()); +#endif + /* * set clock frequency: * REALVIEW_REFCLK is 32KHz diff --git a/arch/arm/mach-realview/localtimer.c b/arch/arm/mach-realview/localtimer.c index c7bdf04..529eb69 100644 --- a/arch/arm/mach-realview/localtimer.c +++ b/arch/arm/mach-realview/localtimer.c @@ -14,6 +14,8 @@ #include <linux/device.h> #include <linux/smp.h> #include <linux/jiffies.h> +#include <linux/percpu.h> +#include <linux/clockchips.h> #include <asm/mach/time.h> #include <asm/hardware/arm_twd.h> @@ -25,6 +27,20 @@ #define TWD_BASE(cpu) (__io_address(REALVIEW_TWD_BASE) + \ ((cpu) * REALVIEW_TWD_SIZE)) +static DEFINE_PER_CPU(struct clock_event_device, local_clockevent); + +/* + * Used on SMP for either the local timer or IPI_TIMER + */ +void local_timer_interrupt(void) +{ + struct clock_event_device *clk = &__get_cpu_var(local_clockevent); + + clk->event_handler(clk); +} + +#ifdef CONFIG_LOCAL_TIMERS + static unsigned long mpcore_timer_rate; /* @@ -127,3 +143,26 @@ void __cpuexit local_timer_stop(unsigned int cpu) { __raw_writel(0, TWD_BASE(cpu) + TWD_TIMER_CONTROL); } + +#else /* CONFIG_LOCAL_TIMERS */ + +static void dummy_timer_set_mode(enum clock_event_mode mode, + struct clock_event_device *clk) +{ +} + +void __cpuinit local_timer_setup(unsigned int cpu) +{ + struct clock_event_device *clk = &per_cpu(local_clockevent, cpu); + + clk->name = "dummy_timer"; + clk->features = CLOCK_EVT_FEAT_DUMMY; + clk->rating = 200; + clk->set_mode = dummy_timer_set_mode; + clk->broadcast = smp_timer_broadcast; + clk->cpumask = cpumask_of_cpu(cpu); + + clockevents_register_device(clk); +} + +#endif /* !CONFIG_LOCAL_TIMERS */ diff --git a/arch/arm/mach-realview/platsmp.c b/arch/arm/mach-realview/platsmp.c index fce3596..bb5eaa4 100644 --- a/arch/arm/mach-realview/platsmp.c +++ b/arch/arm/mach-realview/platsmp.c @@ -187,10 +187,14 @@ void __init smp_prepare_cpus(unsigned int max_cpus) if (max_cpus > ncores) max_cpus = ncores; +#ifdef CONFIG_LOCAL_TIMERS /* - * Enable the local timer for primary CPU + * Enable the local timer for primary CPU. If the device is + * dummy (!CONFIG_LOCAL_TIMERS), it was already registers in + * realview_timer_init */ local_timer_setup(cpu); +#endif /* * Initialise the present map, which describes the set of CPUs |
