diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/mach-sa1100/generic.c | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/arch/arm/mach-sa1100/generic.c b/arch/arm/mach-sa1100/generic.c index 4575f31..e510295 100644 --- a/arch/arm/mach-sa1100/generic.c +++ b/arch/arm/mach-sa1100/generic.c @@ -20,6 +20,7 @@ #include <linux/platform_device.h> #include <asm/div64.h> +#include <asm/cnt32_to_63.h> #include <asm/hardware.h> #include <asm/system.h> #include <asm/pgtable.h> @@ -118,15 +119,21 @@ EXPORT_SYMBOL(cpufreq_get); /* * This is the SA11x0 sched_clock implementation. This has - * a resolution of 271ns, and a maximum value of 1165s. + * a resolution of 271ns, and a maximum value of 32025597s (370 days). + * + * The return value is guaranteed to be monotonic in that range as + * long as there is always less than 582 seconds between successive + * calls to this function. + * * ( * 1E9 / 3686400 => * 78125 / 288) */ unsigned long long sched_clock(void) { - unsigned long long v; + unsigned long long v = cnt32_to_63(OSCR); - v = (unsigned long long)OSCR * 78125; - do_div(v, 288); + /* the <<1 gets rid of the cnt_32_to_63 top bit saving on a bic insn */ + v *= 78125<<1; + do_div(v, 288<<1); return v; } |