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ARM: plat-nomadik: MTU sched_clock as an option

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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>
This commit is contained in:
Mattias Wallin 2011-05-27 10:29:25 +02:00 committed by Linus Walleij
parent d93dc5c447
commit cba13830d3
2 changed files with 11 additions and 5 deletions
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8
arch/arm/plat-nomadik/Kconfig
View file

@ -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

8
arch/arm/plat-nomadik/timer.c
View file

@ -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);