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author | Rob Herring <rob.herring@calxeda.com> | 2011-12-12 15:29:08 -0600 |
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committer | Rob Herring <rob.herring@calxeda.com> | 2012-02-09 22:42:55 -0600 |
commit | a7bf61620831c5578e434429bc7fa0fd0219c40c (patch) | |
tree | b0e67eeebdd3cc87894022cf2da43b4624ebc9ea /arch/arm/common | |
parent | d65b4e98d7ea3038b767b70fe8be959b2913f16d (diff) | |
download | linux-3.10-a7bf61620831c5578e434429bc7fa0fd0219c40c.tar.gz linux-3.10-a7bf61620831c5578e434429bc7fa0fd0219c40c.tar.bz2 linux-3.10-a7bf61620831c5578e434429bc7fa0fd0219c40c.zip |
ARM: timer-sp: add sched_clock support
Add a sched_clock support for the sp804 timer. The clocksource timer
can optionally initialize itself as sched_clock timer.
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Diffstat (limited to 'arch/arm/common')
-rw-r--r-- | arch/arm/common/timer-sp.c | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/arch/arm/common/timer-sp.c b/arch/arm/common/timer-sp.c index 8794a34eae6..df13a3ffff3 100644 --- a/arch/arm/common/timer-sp.c +++ b/arch/arm/common/timer-sp.c @@ -26,6 +26,7 @@ #include <linux/irq.h> #include <linux/io.h> +#include <asm/sched_clock.h> #include <asm/hardware/arm_timer.h> static long __init sp804_get_clock_rate(const char *name) @@ -67,7 +68,16 @@ static long __init sp804_get_clock_rate(const char *name) return rate; } -void __init sp804_clocksource_init(void __iomem *base, const char *name) +static void __iomem *sched_clock_base; + +static u32 sp804_read(void) +{ + return ~readl_relaxed(sched_clock_base + TIMER_VALUE); +} + +void __init __sp804_clocksource_and_sched_clock_init(void __iomem *base, + const char *name, + int use_sched_clock) { long rate = sp804_get_clock_rate(name); @@ -83,6 +93,11 @@ void __init sp804_clocksource_init(void __iomem *base, const char *name) clocksource_mmio_init(base + TIMER_VALUE, name, rate, 200, 32, clocksource_mmio_readl_down); + + if (use_sched_clock) { + sched_clock_base = base; + setup_sched_clock(sp804_read, 32, rate); + } } |