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ARM: mxc: Add sched_clock to mxc platform

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Add sched_clock using cyc_to_sched_clock and update_sched_clock
with HAVE_SCHED_CLOCK
tested on iMX27 and iMX35

Signed-off-by: Jan Weitzel <j.weitzel@phytec.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Jan Weitzel 2011-03-17 13:44:30 +01:00 committed by Sascha Hauer
parent 93b20e4fdb
commit c124befc0d
2 changed files with 17 additions and 0 deletions
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1
arch/arm/Kconfig
View File

@ -362,6 +362,7 @@ config ARCH_MXC
select GENERIC_CLOCKEVENTS
select ARCH_REQUIRE_GPIOLIB
select CLKDEV_LOOKUP
select HAVE_SCHED_CLOCK
help
Support for Freescale MXC/iMX-based family of processors

16
arch/arm/plat-mxc/time.c
View File

@ -27,6 +27,7 @@
#include <linux/clk.h>
#include <mach/hardware.h>
#include <asm/sched_clock.h>
#include <asm/mach/time.h>
#include <mach/common.h>
@ -128,6 +129,20 @@ static struct clocksource clocksource_mxc = {
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
static DEFINE_CLOCK_DATA(cd);
unsigned long long notrace sched_clock(void)
{
cycle_t cyc = clocksource_mxc.read(&clocksource_mxc);
return cyc_to_sched_clock(&cd, cyc, (u32)~0);
}
static void notrace mxc_update_sched_clock(void)
{
cycle_t cyc = clocksource_mxc.read(&clocksource_mxc);
update_sched_clock(&cd, cyc, (u32)~0);
}
static int __init mxc_clocksource_init(struct clk *timer_clk)
{
unsigned int c = clk_get_rate(timer_clk);
@ -137,6 +152,7 @@ static int __init mxc_clocksource_init(struct clk *timer_clk)
else
clocksource_mxc.read = mx1_2_get_cycles;
init_sched_clock(&cd, mxc_update_sched_clock, 32, c);
clocksource_register_hz(&clocksource_mxc, c);
return 0;