michaelh/zephyr
1
0
Fork 0
Code Releases Activity

drivers: timer: Add per-core ARM architected timer

Browse source 
ARM cores may have a per-core architected timer, which provides per-cpu
timers, attached to a GIC to deliver its per-processor interrupts via
PPIs. This is the most common case supported by QEMU in the virt
platform.

This patch introduces support for this timer abstracting the way the
timer registers are actually accessed. This is needed because different
architectures (for example ARMv7-R vs ARMv8-A) use different registers
and even the same architecture (ARMv8-A) can actually use different
timers (ELx physical timers vs ELx virtual timers).

So we introduce the common driver here but the actual SoC / architecture
/ board must provide the three helpers (arm_arch_timer_set_compare(),
arm_arch_timer_toggle(), arm_arch_timer_count()) using an header file
imported through the arch/cpu.h header file.

Signed-off-by: Carlo Caione <ccaione@baylibre.com>
This commit is contained in:
Carlo Caione 2019-10-27 16:12:58 +00:00 • committed by Anas Nashif
commit 6f36300219
7 changed files with 156 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

21
include/drivers/timer/arm_arch_timer.h Normal file
View file

@ -0,0 +1,21 @@
/*
* Copyright (c) 2019 Carlo Caione <ccaione@baylibre.com>
*
* SPDX-License-Identifier: Apache-2.0
*/
#ifndef ZEPHYR_INCLUDE_DRIVERS_TIMER_ARM_ARCH_TIMER_H_
#define ZEPHYR_INCLUDE_DRIVERS_TIMER_ARM_ARCH_TIMER_H_
#include <dt-bindings/interrupt-controller/arm-gic.h>
#include <zephyr/types.h>
#define ARM_TIMER_SECURE_IRQ DT_ARM_ARM_TIMER_TIMER_IRQ_0
#define ARM_TIMER_NON_SECURE_IRQ DT_ARM_ARM_TIMER_TIMER_IRQ_1
#define ARM_TIMER_VIRTUAL_IRQ DT_ARM_ARM_TIMER_TIMER_IRQ_2
#define ARM_TIMER_HYP_IRQ DT_ARM_ARM_TIMER_TIMER_IRQ_3
#define ARM_TIMER_FLAGS IRQ_TYPE_EDGE
#endif /* ZEPHYR_INCLUDE_DRIVERS_TIMER_ARM_ARCH_TIMER_H_ */