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OpenCloudOS-Kernel/arch/arm/include/asm/arch_timer.h

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ARM: local timers: Add A15 architected timer support Add support for the A15 generic timer and clocksource. As the timer generates interrupts on a different PPI depending on the execution mode (normal or secure), it is possible to register two different PPIs. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2012-01-12 01:25:17 +08:00
#ifndef __ASMARM_ARCH_TIMER_H
#define __ASMARM_ARCH_TIMER_H
ARM: 7451/1: arch timer: implement read_current_timer and get_cycles This patch implements read_current_timer using the architected timers when they are selected via CONFIG_ARM_ARCH_TIMER. If they are detected not to be usable at runtime, we return -ENXIO to the caller. Furthermore, if read_current_timer is exported then we can implement get_cycles in terms of it for use as both an entropy source and for implementing __udelay and friends. Tested-by: Shinya Kuribayashi <shinya.kuribayashi.px@renesas.com> Reviewed-by: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2012-07-06 22:46:45 +08:00
#include <asm/errno.h>
ARM: 7522/1: arch_timers: register a time/cycle counter Some subsystems (KVM for example) need access to a cycle counter. In the KVM case, this is used to measure the time delta between host and guest in order to accurately generate timer events for the guest. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2012-09-08 01:09:58 +08:00
#include <linux/clocksource.h>
ARM: 7451/1: arch timer: implement read_current_timer and get_cycles This patch implements read_current_timer using the architected timers when they are selected via CONFIG_ARM_ARCH_TIMER. If they are detected not to be usable at runtime, we return -ENXIO to the caller. Furthermore, if read_current_timer is exported then we can implement get_cycles in terms of it for use as both an entropy source and for implementing __udelay and friends. Tested-by: Shinya Kuribayashi <shinya.kuribayashi.px@renesas.com> Reviewed-by: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2012-07-06 22:46:45 +08:00
ARM: local timers: Add A15 architected timer support Add support for the A15 generic timer and clocksource. As the timer generates interrupts on a different PPI depending on the execution mode (normal or secure), it is possible to register two different PPIs. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2012-01-12 01:25:17 +08:00
#ifdef CONFIG_ARM_ARCH_TIMER
ARM: architected timers: add DT support Add runtime DT support and documentation for the Cortex A7/A15 architected timers. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2012-01-19 21:53:50 +08:00
int arch_timer_of_register(void);
ARM: architected timers: remove support for non DT platforms All mainline platforms using the ARM architected timers are DT only. As such, remove the ad-hoc support that is not longer needed anymore. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2012-04-27 20:18:42 +08:00
int arch_timer_sched_clock_init(void);
ARM: 7522/1: arch_timers: register a time/cycle counter Some subsystems (KVM for example) need access to a cycle counter. In the KVM case, this is used to measure the time delta between host and guest in order to accurately generate timer events for the guest. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2012-09-08 01:09:58 +08:00
struct timecounter *arch_timer_get_timecounter(void);
ARM: local timers: Add A15 architected timer support Add support for the A15 generic timer and clocksource. As the timer generates interrupts on a different PPI depending on the execution mode (normal or secure), it is possible to register two different PPIs. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2012-01-12 01:25:17 +08:00
#else
ARM: architected timers: add DT support Add runtime DT support and documentation for the Cortex A7/A15 architected timers. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2012-01-19 21:53:50 +08:00
static inline int arch_timer_of_register(void)
{
return -ENXIO;
}
ARM: architected timers: Add A15 specific sched_clock implementation Provide an A15 sched_clock implementation using the virtual counter, which is thought to be more useful than the physical one in a virtualised environment, as it can offset the time spent in another VM or the hypervisor. Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2011-01-14 23:32:36 +08:00
static inline int arch_timer_sched_clock_init(void)
{
return -ENXIO;
}
ARM: 7522/1: arch_timers: register a time/cycle counter Some subsystems (KVM for example) need access to a cycle counter. In the KVM case, this is used to measure the time delta between host and guest in order to accurately generate timer events for the guest. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2012-09-08 01:09:58 +08:00
static inline struct timecounter *arch_timer_get_timecounter(void)
{
return NULL;
}
ARM: local timers: Add A15 architected timer support Add support for the A15 generic timer and clocksource. As the timer generates interrupts on a different PPI depending on the execution mode (normal or secure), it is possible to register two different PPIs. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2012-01-12 01:25:17 +08:00
#endif
#endif