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

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

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2010-12-15 21:52:10 +00:00
parent 5c21b7ca2c
commit 08f26b1ef2
2 changed files with 13 additions and 3 deletions
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1
arch/arm/Kconfig
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@ -992,6 +992,7 @@ config ARCH_ACORN
config PLAT_IOP
bool
select GENERIC_CLOCKEVENTS
select HAVE_SCHED_CLOCK
config PLAT_ORION
bool

15
arch/arm/plat-iop/time.c
View File

@ -24,6 +24,7 @@
#include <linux/clockchips.h>
#include <mach/hardware.h>
#include <asm/irq.h>
#include <asm/sched_clock.h>
#include <asm/uaccess.h>
#include <asm/mach/irq.h>
#include <asm/mach/time.h>
@ -50,15 +51,21 @@ static struct clocksource iop_clocksource = {
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
static DEFINE_CLOCK_DATA(cd);
/*
* IOP sched_clock() implementation via its clocksource.
*/
unsigned long long notrace sched_clock(void)
{
cycle_t cyc = iop_clocksource_read(NULL);
struct clocksource *cs = &iop_clocksource;
u32 cyc = 0xffffffffu - read_tcr1();
return cyc_to_sched_clock(&cd, cyc, (u32)~0);
}
return clocksource_cyc2ns(cyc, cs->mult, cs->shift);
static void notrace iop_update_sched_clock(void)
{
u32 cyc = 0xffffffffu - read_tcr1();
update_sched_clock(&cd, cyc, (u32)~0);
}
/*
@ -144,6 +151,8 @@ void __init iop_init_time(unsigned long tick_rate)
{
u32 timer_ctl;
init_sched_clock(&cd, iop_update_sched_clock, 32, tick_rate);
ticks_per_jiffy = DIV_ROUND_CLOSEST(tick_rate, HZ);
iop_tick_rate = tick_rate;