From 5b0d495c067d843c52fc1f9edbca29d5e9368b10 Mon Sep 17 00:00:00 2001 From: Russell King Date: Wed, 15 Dec 2010 21:23:13 +0000 Subject: ARM: ixp4xx: convert sched_clock() to use new infrastructure Convert ixp4xx to use the new sched_clock() infrastructure for extending 32bit counters to full 64-bit nanoseconds. Tested-by: Mikael Pettersson Signed-off-by: Russell King --- arch/arm/Kconfig | 1 + arch/arm/mach-ixp4xx/common.c | 31 ++++++++++++++++++++----------- 2 files changed, 21 insertions(+), 11 deletions(-) (limited to 'arch/arm') diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index ed7a0a729d9..6f58bce687f 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -437,6 +437,7 @@ config ARCH_IXP4XX select CPU_XSCALE select GENERIC_GPIO select GENERIC_CLOCKEVENTS + select HAVE_SCHED_CLOCK select DMABOUNCE if PCI help Support for Intel's IXP4XX (XScale) family of processors. diff --git a/arch/arm/mach-ixp4xx/common.c b/arch/arm/mach-ixp4xx/common.c index e0b91d8ef64..4dbfcbb9163 100644 --- a/arch/arm/mach-ixp4xx/common.c +++ b/arch/arm/mach-ixp4xx/common.c @@ -35,6 +35,7 @@ #include #include #include +#include #include #include @@ -398,6 +399,23 @@ void __init ixp4xx_sys_init(void) ixp4xx_exp_bus_size >> 20); } +/* + * sched_clock() + */ +static DEFINE_CLOCK_DATA(cd); + +unsigned long long notrace sched_clock(void) +{ + u32 cyc = *IXP4XX_OSTS; + return cyc_to_sched_clock(&cd, cyc, (u32)~0); +} + +static void notrace ixp4xx_update_sched_clock(void) +{ + u32 cyc = *IXP4XX_OSTS; + update_sched_clock(&cd, cyc, (u32)~0); +} + /* * clocksource */ @@ -418,18 +436,9 @@ unsigned long ixp4xx_timer_freq = FREQ; EXPORT_SYMBOL(ixp4xx_timer_freq); static void __init ixp4xx_clocksource_init(void) { - clocksource_register_hz(&clocksource_ixp4xx, ixp4xx_timer_freq); -} - -/* - * sched_clock() - */ -unsigned long long notrace sched_clock(void) -{ - cycle_t cyc = ixp4xx_get_cycles(NULL); - struct clocksource *cs = &clocksource_ixp4xx; + init_sched_clock(&cd, ixp4xx_update_sched_clock, 32, ixp4xx_timer_freq); - return clocksource_cyc2ns(cyc, cs->mult, cs->shift); + clocksource_register_hz(&clocksource_ixp4xx, ixp4xx_timer_freq); } /* -- cgit v1.2.3-70-g09d2