From 56942fec06efa0e17df0f4c3b438332c923b9014 Mon Sep 17 00:00:00 2001 From: Jonathan Austin Date: Fri, 21 Sep 2012 18:51:44 +0100 Subject: 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 Signed-off-by: Jonathan Austin Signed-off-by: Will Deacon Signed-off-by: Russell King --- arch/arm/include/asm/arch_timer.h | 1 - arch/arm/include/asm/delay.h | 9 +++++++++ arch/arm/include/asm/timex.h | 6 ------ 3 files changed, 9 insertions(+), 7 deletions(-) (limited to 'arch/arm/include') 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 #ifdef CONFIG_ARM_ARCH_TIMER -#define ARCH_HAS_READ_CURRENT_TIMER 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. */ +#define ARCH_HAS_READ_CURRENT_TIMER +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 @@ #ifndef _ASMARM_TIMEX_H #define _ASMARM_TIMEX_H -#include #include typedef unsigned long cycles_t; - -#ifdef ARCH_HAS_READ_CURRENT_TIMER #define get_cycles() ({ cycles_t c; read_current_timer(&c) ? 0 : c; }) -#else -#define get_cycles() (0) -#endif #endif -- cgit v1.2.3