From: Mattias Wallin Date: Fri, 27 May 2011 08:29:25 +0000 (+0200) Subject: ARM: plat-nomadik: MTU sched_clock as an option X-Git-Tag: firefly_0821_release~3680^2~4240^2~9 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=cba13830d3fcb1e025e224c496a10515a39a7f80;p=firefly-linux-kernel-4.4.55.git 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 Signed-off-by: Mattias Wallin Signed-off-by: Jonas Aberg Signed-off-by: Linus Walleij --- 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 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);