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Commit 5c21b7ca authored by Russell King's avatar Russell King
Browse files

ARM: u300: convert sched_clock() to use new infrastructure 



Convert u300 to use the new sched_clock() infrastructure for extending
32bit counters to full 64-bit nanoseconds.

Acked-by: default avatarLinus Walleij <linus.walleij@stericsson.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent e3f4c0ab

arch/arm/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -790,6 +790,7 @@ config ARCH_U300 
	bool "ST-Ericsson U300 Series"

	depends on MMU

	select CPU_ARM926T

	select HAVE_SCHED_CLOCK

	select HAVE_TCM

	select ARM_AMBA

	select ARM_VIC

arch/arm/mach-u300/timer.c

+13 −4
Original line number Diff line number Diff line
@@ -22,6 +22,7 @@ 
#include <mach/hardware.h>



/* Generic stuff */

#include <asm/sched_clock.h>

#include <asm/mach/map.h>

#include <asm/mach/time.h>

#include <asm/mach/irq.h>
@@ -353,12 +354,18 @@ static struct clocksource clocksource_u300_1mhz = { 
 * this wraps around for now, since it is just a relative time

 * stamp. (Inspired by OMAP implementation.)

 */

static DEFINE_CLOCK_DATA(cd);



unsigned long long notrace sched_clock(void)

{

	return clocksource_cyc2ns(clocksource_u300_1mhz.read(

				  &clocksource_u300_1mhz),

				  clocksource_u300_1mhz.mult,

				  clocksource_u300_1mhz.shift);

	u32 cyc = readl(U300_TIMER_APP_VBASE + U300_TIMER_APP_GPT2CC);

	return cyc_to_sched_clock(&cd, cyc, (u32)~0);

}



static void notrace u300_update_sched_clock(void)

{

	u32 cyc = readl(U300_TIMER_APP_VBASE + U300_TIMER_APP_GPT2CC);

	update_sched_clock(&cd, cyc, (u32)~0);

}
@@ -376,6 +383,8 @@ static void __init u300_timer_init(void) 
	clk_enable(clk);

	rate = clk_get_rate(clk);



	init_sched_clock(&cd, u300_update_sched_clock, 32, rate);



	/*

	 * Disable the "OS" and "DD" timers - these are designed for Symbian!

	 * Example usage in cnh1601578 cpu subsystem pd_timer_app.c