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authorMattias Wallin <mattias.wallin@stericsson.com>2011-05-27 10:29:25 +0200
committerLinus Walleij <linus.walleij@linaro.org>2011-09-22 15:42:33 +0200
commitcba13830d3fcb1e025e224c496a10515a39a7f80 (patch)
tree57598cebc2aeba64659f0d2b5fcab42e69624787 /arch/arm/plat-nomadik
parentd93dc5c4478c1fd5de85a3e8aece9aad7bbae044 (diff)
downloadlinux-cba13830d3fcb1e025e224c496a10515a39a7f80.tar.bz2
ARM: plat-nomadik: MTU sched_clock as an option
This patch makes it possible to configure away the sched_clock part of the MTU timer. Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Mattias Wallin <mattias.wallin@stericsson.com> Signed-off-by: Jonas Aberg <jonas.aberg@stericsson.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'arch/arm/plat-nomadik')
-rw-r--r--arch/arm/plat-nomadik/Kconfig8
-rw-r--r--arch/arm/plat-nomadik/timer.c8
2 files changed, 11 insertions, 5 deletions
diff --git a/arch/arm/plat-nomadik/Kconfig b/arch/arm/plat-nomadik/Kconfig
index ce659015535e..bca4914b4b9d 100644
--- a/arch/arm/plat-nomadik/Kconfig
+++ b/arch/arm/plat-nomadik/Kconfig
@@ -15,10 +15,16 @@ if PLAT_NOMADIK
config HAS_MTU
bool
- select HAVE_SCHED_CLOCK
help
Support for Multi Timer Unit. MTU provides access
to multiple interrupt generating programmable
32-bit free running decrementing counters.
+config NOMADIK_MTU_SCHED_CLOCK
+ bool
+ depends on HAS_MTU
+ select HAVE_SCHED_CLOCK
+ help
+ Use the Multi Timer Unit as the sched_clock.
+
endif
diff --git a/arch/arm/plat-nomadik/timer.c b/arch/arm/plat-nomadik/timer.c
index ef74e157a9d5..bd638c552f04 100644
--- a/arch/arm/plat-nomadik/timer.c
+++ b/arch/arm/plat-nomadik/timer.c
@@ -24,7 +24,7 @@
#include <plat/mtu.h>
void __iomem *mtu_base; /* Assigned by machine code */
-
+#ifdef CONFIG_NOMADIK_MTU_SCHED_CLOCK
/*
* Override the global weak sched_clock symbol with this
* local implementation which uses the clocksource to get some
@@ -48,7 +48,7 @@ static void notrace nomadik_update_sched_clock(void)
u32 cyc = -readl(mtu_base + MTU_VAL(0));
update_sched_clock(&cd, cyc, (u32)~0);
}
-
+#endif
/* Clockevent device: use one-shot mode */
static void nmdk_clkevt_mode(enum clock_event_mode mode,
struct clock_event_device *dev)
@@ -153,9 +153,9 @@ void __init nmdk_timer_init(void)
rate, 200, 32, clocksource_mmio_readl_down))
pr_err("timer: failed to initialize clock source %s\n",
"mtu_0");
-
+#ifdef CONFIG_NOMADIK_MTU_SCHED_CLOCK
init_sched_clock(&cd, nomadik_update_sched_clock, 32, rate);
-
+#endif
/* Timer 1 is used for events */
clockevents_calc_mult_shift(&nmdk_clkevt, rate, MTU_MIN_RANGE);