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ARM: ixp4xx: convert sched_clock() to use new infrastructure

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Convert ixp4xx to use the new sched_clock() infrastructure for
extending 32bit counters to full 64-bit nanoseconds.

Tested-by: Mikael Pettersson <mikpe@it.uu.se>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2010-12-15 21:23:13 +00:00
parent 112f38a4a3
commit 5b0d495c06
2 changed files with 21 additions and 11 deletions
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1
arch/arm/Kconfig
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@ -437,6 +437,7 @@ config ARCH_IXP4XX
select CPU_XSCALE select CPU_XSCALE
select GENERIC_GPIO select GENERIC_GPIO
select GENERIC_CLOCKEVENTS select GENERIC_CLOCKEVENTS
select HAVE_SCHED_CLOCK
select DMABOUNCE if PCI select DMABOUNCE if PCI
help help
Support for Intel's IXP4XX (XScale) family of processors. Support for Intel's IXP4XX (XScale) family of processors.

31
arch/arm/mach-ixp4xx/common.c
View File

@ -35,6 +35,7 @@
#include <asm/pgtable.h> #include <asm/pgtable.h>
#include <asm/page.h> #include <asm/page.h>
#include <asm/irq.h> #include <asm/irq.h>
#include <asm/sched_clock.h>
#include <asm/mach/map.h> #include <asm/mach/map.h>
#include <asm/mach/irq.h> #include <asm/mach/irq.h>
@ -398,6 +399,23 @@ void __init ixp4xx_sys_init(void)
ixp4xx_exp_bus_size >> 20); 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 * clocksource
*/ */
@ -418,20 +436,11 @@ unsigned long ixp4xx_timer_freq = FREQ;
EXPORT_SYMBOL(ixp4xx_timer_freq); EXPORT_SYMBOL(ixp4xx_timer_freq);
static void __init ixp4xx_clocksource_init(void) static void __init ixp4xx_clocksource_init(void)
{ {
init_sched_clock(&cd, ixp4xx_update_sched_clock, 32, ixp4xx_timer_freq);
clocksource_register_hz(&clocksource_ixp4xx, ixp4xx_timer_freq); 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;
return clocksource_cyc2ns(cyc, cs->mult, cs->shift);
}
/* /*
* clockevents * clockevents
*/ */