path: root/arch/arm/include/asm
diff options
authorJonathan Austin <Jonathan.Austin@arm.com>2012-09-21 18:51:44 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2012-09-26 22:57:52 +0100
commit56942fec06efa0e17df0f4c3b438332c923b9014 (patch)
tree89b604c987b7f6a0eaaa16af7a9d8f45711349a7 /arch/arm/include/asm
parenta1b2dde70419ae947fd7c9c8fcad7da005dc600e (diff)
ARM: 7538/1: delay: add registration mechanism for delay timer sources
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>
Diffstat (limited to 'arch/arm/include/asm')
3 files changed, 9 insertions, 7 deletions
diff --git a/arch/arm/include/asm/arch_timer.h b/arch/arm/include/asm/arch_timer.h
index ad9b155c8262..d40229d9a1c9 100644
--- a/arch/arm/include/asm/arch_timer.h
+++ b/arch/arm/include/asm/arch_timer.h
@@ -5,7 +5,6 @@
#include <linux/clocksource.h>
int arch_timer_of_register(void);
int arch_timer_sched_clock_init(void);
struct timecounter *arch_timer_get_timecounter(void);
diff --git a/arch/arm/include/asm/delay.h b/arch/arm/include/asm/delay.h
index dc6145120de3..ab98fdd083bd 100644
--- a/arch/arm/include/asm/delay.h
+++ b/arch/arm/include/asm/delay.h
@@ -15,6 +15,11 @@
#ifndef __ASSEMBLY__
+struct delay_timer {
+ unsigned long (*read_current_timer)(void);
+ unsigned long freq;
extern struct arm_delay_ops {
void (*delay)(unsigned long);
void (*const_udelay)(unsigned long);
@@ -56,6 +61,10 @@ extern void __loop_delay(unsigned long loops);
extern void __loop_udelay(unsigned long usecs);
extern void __loop_const_udelay(unsigned long);
+/* Delay-loop timer registration. */
+extern void register_current_timer_delay(const struct delay_timer *timer);
#endif /* __ASSEMBLY__ */
#endif /* defined(_ARM_DELAY_H) */
diff --git a/arch/arm/include/asm/timex.h b/arch/arm/include/asm/timex.h
index ce119442277c..9acc135dad94 100644
--- a/arch/arm/include/asm/timex.h
+++ b/arch/arm/include/asm/timex.h
@@ -12,15 +12,9 @@
-#include <asm/arch_timer.h>
#include <mach/timex.h>
typedef unsigned long cycles_t;
#define get_cycles() ({ cycles_t c; read_current_timer(&c) ? 0 : c; })
-#define get_cycles() (0)