diff options
| author |   Mikael Pettersson <mikpe@it.uu.se> | 2009-10-29 11:46:56 -0700 |
|---|---|---|
| committer |   Dan Williams <dan.j.williams@intel.com> | 2009-10-29 11:46:56 -0700 |
| commit | 345a32296b1f9f6121379e0240915e0e2be2dbf5 (patch) | |
| tree | 995ad5887af10b11b2cbc48e8936f7f7d9fbb109 | |
| parent | iop: enable generic time (diff) | |
| download | linux-dev-345a32296b1f9f6121379e0240915e0e2be2dbf5.tar.xz linux-dev-345a32296b1f9f6121379e0240915e0e2be2dbf5.zip | |
iop: implement sched_clock()
This adds a better sched_clock() to the IOP platform,
implemented using its new clocksource support.
Tested on n2100, compile-tested for all plat-iop machines.
[dan.j.williams@intel.com: allow early cp6 access]
Signed-off-by: Mikael Pettersson <mikpe@it.uu.se>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
| -rw-r--r-- | arch/arm/mm/proc-xsc3.S | 2 | ||||
| -rw-r--r-- | arch/arm/plat-iop/time.c | 11 |
2 files changed, 12 insertions, 1 deletions
diff --git a/arch/arm/mm/proc-xsc3.S b/arch/arm/mm/proc-xsc3.S index 2028f3702881..fab134e29826 100644 --- a/arch/arm/mm/proc-xsc3.S +++ b/arch/arm/mm/proc-xsc3.S @@ -396,7 +396,7 @@ __xsc3_setup: orr r4, r4, #0x18 @ cache the page table in L2 mcr p15, 0, r4, c2, c0, 0 @ load page table pointer - mov r0, #0 @ don't allow CP access + mov r0, #1 << 6 @ cp6 access for early sched_clock mcr p15, 0, r0, c15, c1, 0 @ write CP access register mrc p15, 0, r0, c1, c0, 1 @ get auxiliary control reg diff --git a/arch/arm/plat-iop/time.c b/arch/arm/plat-iop/time.c index aaaef3b4bc65..6c8a02ad98e3 100644 --- a/arch/arm/plat-iop/time.c +++ b/arch/arm/plat-iop/time.c @@ -66,6 +66,17 @@ static void __init iop_clocksource_set_hz(struct clocksource *cs, unsigned int h } /* + * IOP sched_clock() implementation via its clocksource. + */ +unsigned long long sched_clock(void) +{ + cycle_t cyc = iop_clocksource_read(NULL); + struct clocksource *cs = &iop_clocksource; + + return clocksource_cyc2ns(cyc, cs->mult, cs->shift); +} + +/* * IOP clockevents (interrupting timer 0). */ static int iop_set_next_event(unsigned long delta, |