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authorFabio Baltieri <fabio.baltieri@linaro.org>2012-12-04 11:10:44 +0100
committerLinus Walleij <linus.walleij@linaro.org>2013-01-06 23:55:47 +0100
commitf192af44d8c8c859bb66c7622ed59473cf705460 (patch)
treec6751ac797fbc6f57adaf6cda6ccb96fdc135957
parentd1c3ed669a2d452cacfb48c2d171a1f364dae2ed (diff)
downloadlinux-stericsson-f192af44d8c8c859bb66c7622ed59473cf705460.tar.gz
clocksource: nomadik-mtu: support timer-based delay
This patch adds support to use Nomadik MTU for timer-based delay. Acked-by: John Stultz <john.stultz@linaro.org> Signed-off-by: Fabio Baltieri <fabio.baltieri@linaro.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
-rw-r--r--drivers/clocksource/nomadik-mtu.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/clocksource/nomadik-mtu.c b/drivers/clocksource/nomadik-mtu.c
index 8914c3c1c88b..5f3c8dbf360f 100644
--- a/drivers/clocksource/nomadik-mtu.c
+++ b/drivers/clocksource/nomadik-mtu.c
@@ -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);
}