From 91a2fcc88634663e9e13dcdfad0e4a860e64aeee Mon Sep 17 00:00:00 2001 From: Ralf Baechle Date: Thu, 11 Oct 2007 23:46:09 +0100 Subject: [MIPS] Consolidate all variants of MIPS cp0 timer interrupt handlers. Signed-off-by: Ralf Baechle --- arch/mips/mips-boards/generic/time.c | 112 ++--------------------------------- 1 file changed, 5 insertions(+), 107 deletions(-) (limited to 'arch/mips/mips-boards/generic/time.c') diff --git a/arch/mips/mips-boards/generic/time.c b/arch/mips/mips-boards/generic/time.c index 075f9d46f40..345de881013 100644 --- a/arch/mips/mips-boards/generic/time.c +++ b/arch/mips/mips-boards/generic/time.c @@ -67,108 +67,6 @@ static void mips_perf_dispatch(void) do_IRQ(cp0_perfcount_irq); } -/* - * Redeclare until I get around mopping the timer code insanity on MIPS. - */ -extern int null_perf_irq(void); - -extern int (*perf_irq)(void); - -/* - * Possibly handle a performance counter interrupt. - * Return true if the timer interrupt should not be checked - */ -static inline int handle_perf_irq (int r2) -{ - /* - * The performance counter overflow interrupt may be shared with the - * timer interrupt (cp0_perfcount_irq < 0). If it is and a - * performance counter has overflowed (perf_irq() == IRQ_HANDLED) - * and we can't reliably determine if a counter interrupt has also - * happened (!r2) then don't check for a timer interrupt. - */ - return (cp0_perfcount_irq < 0) && - perf_irq() == IRQ_HANDLED && - !r2; -} - -irqreturn_t mips_timer_interrupt(int irq, void *dev_id) -{ - int cpu = smp_processor_id(); - -#ifdef CONFIG_MIPS_MT_SMTC - /* - * In an SMTC system, one Count/Compare set exists per VPE. - * Which TC within a VPE gets the interrupt is essentially - * random - we only know that it shouldn't be one with - * IXMT set. Whichever TC gets the interrupt needs to - * send special interprocessor interrupts to the other - * TCs to make sure that they schedule, etc. - * - * That code is specific to the SMTC kernel, not to - * the a particular platform, so it's invoked from - * the general MIPS timer_interrupt routine. - */ - - /* - * We could be here due to timer interrupt, - * perf counter overflow, or both. - */ - (void) handle_perf_irq(1); - - if (read_c0_cause() & (1 << 30)) { - /* - * There are things we only want to do once per tick - * in an "MP" system. One TC of each VPE will take - * the actual timer interrupt. The others will get - * timer broadcast IPIs. We use whoever it is that takes - * the tick on VPE 0 to run the full timer_interrupt(). - */ - if (cpu_data[cpu].vpe_id == 0) { - timer_interrupt(irq, NULL); - } else { - write_c0_compare(read_c0_count() + - (mips_hpt_frequency/HZ)); - local_timer_interrupt(irq, dev_id); - } - smtc_timer_broadcast(); - } -#else /* CONFIG_MIPS_MT_SMTC */ - int r2 = cpu_has_mips_r2; - - if (handle_perf_irq(r2)) - goto out; - - if (r2 && ((read_c0_cause() & (1 << 30)) == 0)) - goto out; - - if (cpu == 0) { - /* - * CPU 0 handles the global timer interrupt job and process - * accounting resets count/compare registers to trigger next - * timer int. - */ - timer_interrupt(irq, NULL); - } else { - /* Everyone else needs to reset the timer int here as - ll_local_timer_interrupt doesn't */ - /* - * FIXME: need to cope with counter underflow. - * More support needs to be added to kernel/time for - * counter/timer interrupts on multiple CPU's - */ - write_c0_compare(read_c0_count() + (mips_hpt_frequency/HZ)); - - /* - * Other CPUs should do profiling and process accounting - */ - local_timer_interrupt(irq, dev_id); - } -out: -#endif /* CONFIG_MIPS_MT_SMTC */ - return IRQ_HANDLED; -} - /* * Estimate CPU frequency. Sets mips_hpt_frequency as a side-effect */ @@ -246,7 +144,7 @@ void __init plat_time_init(void) mips_scroll_message(); } -irqreturn_t mips_perf_interrupt(int irq, void *dev_id) +static irqreturn_t mips_perf_interrupt(int irq, void *dev_id) { return perf_irq(); } @@ -257,8 +155,10 @@ static struct irqaction perf_irqaction = { .name = "performance", }; -void __init plat_perf_setup(struct irqaction *irq) +void __init plat_perf_setup(void) { + struct irqaction *irq = &perf_irqaction; + cp0_perfcount_irq = -1; #ifdef MSC01E_INT_BASE @@ -297,8 +197,6 @@ void __init plat_timer_setup(struct irqaction *irq) mips_cpu_timer_irq = MIPS_CPU_IRQ_BASE + cp0_compare_irq; } - /* we are using the cpu counter for timer interrupts */ - irq->handler = mips_timer_interrupt; /* we use our own handler */ #ifdef CONFIG_MIPS_MT_SMTC setup_irq_smtc(mips_cpu_timer_irq, irq, 0x100 << cp0_compare_irq); #else @@ -308,5 +206,5 @@ void __init plat_timer_setup(struct irqaction *irq) set_irq_handler(mips_cpu_timer_irq, handle_percpu_irq); #endif - plat_perf_setup(&perf_irqaction); + plat_perf_setup(); } -- cgit v1.2.3