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Commit c124befc authored by Jan Weitzel's avatar Jan Weitzel Committed by Sascha Hauer
Browse files

ARM: mxc: Add sched_clock to mxc platform 



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

Signed-off-by: default avatarJan Weitzel <j.weitzel@phytec.de>
Signed-off-by: default avatarSascha Hauer <s.hauer@pengutronix.de>
parent 93b20e4f

arch/arm/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -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

arch/arm/plat-mxc/time.c

+16 −0
Original line number Diff line number Diff line
@@ -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;