mirror of
https://github.com/torvalds/linux.git
synced 2024-12-18 09:02:17 +00:00
56942fec06
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 <sboyd@codeaurora.org> Signed-off-by: Jonathan Austin <jonathan.austin@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
29 lines
519 B
C
29 lines
519 B
C
#ifndef __ASMARM_ARCH_TIMER_H
|
|
#define __ASMARM_ARCH_TIMER_H
|
|
|
|
#include <asm/errno.h>
|
|
#include <linux/clocksource.h>
|
|
|
|
#ifdef CONFIG_ARM_ARCH_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)
|
|
{
|
|
return -ENXIO;
|
|
}
|
|
|
|
static inline int arch_timer_sched_clock_init(void)
|
|
{
|
|
return -ENXIO;
|
|
}
|
|
|
|
static inline struct timecounter *arch_timer_get_timecounter(void)
|
|
{
|
|
return NULL;
|
|
}
|
|
#endif
|
|
|
|
#endif
|