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Commit 6f179b72 authored by Fabio Baltieri's avatar Fabio Baltieri Committed by Linus Walleij
Browse files

clocksource: nomadik-mtu: support timer-based delay 



This patch adds support to use Nomadik MTU for timer-based delay.

Acked-by: default avatarJohn Stultz <john.stultz@linaro.org>
Signed-off-by: default avatarFabio Baltieri <fabio.baltieri@linaro.org>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent 0baf066f

drivers/clocksource/nomadik-mtu.c

+11 −0
Original line number Diff line number Diff line
@@ -15,6 +15,7 @@ 
#include <linux/clocksource.h>

#include <linux/clk.h>

#include <linux/jiffies.h>

#include <linux/delay.h>

#include <linux/err.h>

#include <linux/platform_data/clocksource-nomadik-mtu.h>

#include <asm/mach/time.h>
@@ -64,6 +65,7 @@ static void __iomem *mtu_base; 
static bool clkevt_periodic;

static u32 clk_prescale;

static u32 nmdk_cycle;		/* write-once */

static struct delay_timer mtu_delay_timer;



#ifdef CONFIG_NOMADIK_MTU_SCHED_CLOCK

/*
@@ -80,6 +82,11 @@ static u32 notrace nomadik_read_sched_clock(void) 
}

#endif



static unsigned long nmdk_timer_read_current_timer(void)

{

	return ~readl_relaxed(mtu_base + MTU_VAL(0));

}



/* Clockevent device: use one-shot mode */

static int nmdk_clkevt_next(unsigned long evt, struct clock_event_device *ev)

{
@@ -227,4 +234,8 @@ void __init nmdk_timer_init(void __iomem *base, int irq) 
	setup_irq(irq, &nmdk_timer_irq);

	nmdk_clkevt.cpumask = cpumask_of(0);

	clockevents_config_and_register(&nmdk_clkevt, rate, 2, 0xffffffffU);



	mtu_delay_timer.read_current_timer = &nmdk_timer_read_current_timer;

	mtu_delay_timer.freq = rate;

	register_current_timer_delay(&mtu_delay_timer);

}