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Commit 345a3229 authored Oct 29, 2009 by Mikael Pettersson Committed by Dan Williams Oct 29, 2009

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>

parent 980f2296

arch/arm/mm/proc-xsc3.S

+1 −1

Original line number	Diff line number	Diff line
		@@ -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

arch/arm/plat-iop/time.c

+11 −0

Original line number	Diff line number	Diff line
		@@ -65,6 +65,17 @@ static void __init iop_clocksource_set_hz(struct clocksource *cs, unsigned int h
		cs->name, cs->shift, cs->mult);
		}

		/*
		* 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).
		*/