diff options
| author | Stephen Boyd <sboyd@codeaurora.org> | 2013-07-18 23:21:18 (GMT) |
|---|---|---|
| committer | John Stultz <john.stultz@linaro.org> | 2013-10-09 23:54:10 (GMT) |
| commit | 65cd4f6c99c1170bd0114dbd71b978012ea44d28 (patch) | |
| tree | fbde89149eb5032b49875cddf728d598ffd349ad /drivers/clocksource | |
| parent | 07783397c6e3757de805bda5e1139a9e47aa7d74 (diff) | |
| download | linux-65cd4f6c99c1170bd0114dbd71b978012ea44d28.tar.xz | |
arch_timer: Move to generic sched_clock framework
Register with the generic sched_clock framework now that it
supports 64 bits. This fixes two problems with the current
sched_clock support for machines using the architected timers.
First off, we don't subtract the start value from subsequent
sched_clock calls so we can potentially start off with
sched_clock returning gigantic numbers. Second, there is no
support for suspend/resume handling so problems such as discussed
in 6a4dae5 (ARM: 7565/1: sched: stop sched_clock() during
suspend, 2012-10-23) can happen without this patch. Finally, it
allows us to move the sched_clock setup into drivers clocksource
out of the arch ports.
Cc: Christopher Covington <cov@codeaurora.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Diffstat (limited to 'drivers/clocksource')
| -rw-r--r-- | drivers/clocksource/arm_arch_timer.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c index fbd9ccd..5d52789 100644 --- a/drivers/clocksource/arm_arch_timer.c +++ b/drivers/clocksource/arm_arch_timer.c @@ -19,6 +19,7 @@ #include <linux/of_address.h> #include <linux/io.h> #include <linux/slab.h> +#include <linux/sched_clock.h> #include <asm/arch_timer.h> #include <asm/virt.h> @@ -471,6 +472,15 @@ static int __init arch_timer_register(void) goto out; } + clocksource_register_hz(&clocksource_counter, arch_timer_rate); + cyclecounter.mult = clocksource_counter.mult; + cyclecounter.shift = clocksource_counter.shift; + timecounter_init(&timecounter, &cyclecounter, + arch_counter_get_cntvct()); + + /* 56 bits minimum, so we assume worst case rollover */ + sched_clock_register(arch_timer_read_counter, 56, arch_timer_rate); + if (arch_timer_use_virtual) { ppi = arch_timer_ppi[VIRT_PPI]; err = request_percpu_irq(ppi, arch_timer_handler_virt, |