ARM: 7522/1: arch_timers: register a time/cycle counter (a1b2dde7) · Commits · 戴 / test

arch/arm/include/asm/arch_timer.h

+7 −0

Original line number	Diff line number	Diff line
		@@ -2,11 +2,13 @@
		#define __ASMARM_ARCH_TIMER_H

		#include <asm/errno.h>
		#include <linux/clocksource.h>

		#ifdef CONFIG_ARM_ARCH_TIMER
		#define ARCH_HAS_READ_CURRENT_TIMER
		int arch_timer_of_register(void);
		int arch_timer_sched_clock_init(void);
		struct timecounter *arch_timer_get_timecounter(void);
		#else
		static inline int arch_timer_of_register(void)
		{
		@@ -17,6 +19,11 @@ static inline int arch_timer_sched_clock_init(void)
		{
		return -ENXIO;
		}

		static inline struct timecounter *arch_timer_get_timecounter(void)
		{
		return NULL;
		}
		#endif

		#endif

+25 −0

Original line number	Diff line number	Diff line
		@@ -333,6 +333,15 @@ int read_current_timer(unsigned long *timer_val)
		return 0;
		}

		static cycle_t arch_counter_read_cc(const struct cyclecounter *cc)
		{
		/*
		* Always use the physical counter for the clocksource.
		* CNTHCTL.PL1PCTEN must be set to 1.
		*/
		return arch_counter_get_cntpct();
		}

		static struct clocksource clocksource_counter = {
		.name = "arch_sys_counter",
		.rating = 400,
		@@ -341,6 +350,18 @@ static struct clocksource clocksource_counter = {
		.flags = CLOCK_SOURCE_IS_CONTINUOUS,
		};

		static struct cyclecounter cyclecounter = {
		.read = arch_counter_read_cc,
		.mask = CLOCKSOURCE_MASK(56),
		};

		static struct timecounter timecounter;

		struct timecounter *arch_timer_get_timecounter(void)
		{
		return &timecounter;
		}

		static void __cpuinit arch_timer_stop(struct clock_event_device *clk)
		{
		pr_debug("arch_timer_teardown disable IRQ%d cpu #%d\n",
		@@ -380,6 +401,10 @@ static int __init arch_timer_register(void)
		}

		clocksource_register_hz(&clocksource_counter, arch_timer_rate);
		cyclecounter.mult = clocksource_counter.mult;
		cyclecounter.shift = clocksource_counter.shift;
		timecounter_init(&timecounter, &cyclecounter,
		arch_counter_get_cntpct());

		if (arch_timer_use_virtual) {
		ppi = arch_timer_ppi[VIRT_PPI];