kernel/arch/arm/include/asm/arch_timer.h, branch linux-3.8.y

ARM: 7538/1: delay: add registration mechanism for delay timer sources

2012-09-26T21:57:52Z

The current timer-based delay loop relies on the architected timer to initiate the switch away from the polling-based implementation. This is unfortunate for platforms without the architected timers but with a suitable delay source (that is, constant frequency, always powered-up and ticking as long as the CPUs are online). This patch introduces a registration mechanism for the delay timer (which provides an unconditional read_current_timer implementation) and updates the architected timer code to use the new interface. Reviewed-by: Stephen Boyd Signed-off-by: Jonathan Austin Signed-off-by: Will Deacon Signed-off-by: Russell King

ARM: 7522/1: arch_timers: register a time/cycle counter

2012-09-15T20:53:33Z

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 Signed-off-by: Russell King

ARM: 7451/1: arch timer: implement read_current_timer and get_cycles

2012-07-09T16:42:23Z

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 Reviewed-by: Stephen Boyd Signed-off-by: Will Deacon Signed-off-by: Russell King

ARM: architected timers: remove support for non DT platforms

2012-04-27T12:39:25Z

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

ARM: architected timers: add DT support

2012-04-27T12:35:34Z

Add runtime DT support and documentation for the Cortex A7/A15 architected timers. Signed-off-by: Will Deacon Signed-off-by: Marc Zyngier

ARM: architected timers: Add A15 specific sched_clock implementation

2012-04-27T12:35:33Z

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 Signed-off-by: Marc Zyngier

ARM: local timers: Add A15 architected timer support

2012-04-27T12:35:33Z

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