ARM: prima2: convert to common sched_clock() implementation
Prima2 has its own sched_clock() implementation, which gets in the
way of a single zImage. Moving to the common sched_clock framework
makes the code slightly cleaner (the mapping hack in sched_clock()
goes away...).
Acked-by: Barry Song <baohua.song@csr.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
diff --git a/arch/arm/mach-prima2/timer.c b/arch/arm/mach-prima2/timer.c
index b7a6091..0d024b1 100644
--- a/arch/arm/mach-prima2/timer.c
+++ b/arch/arm/mach-prima2/timer.c
@@ -18,6 +18,7 @@
#include <linux/of.h>
#include <linux/of_address.h>
#include <mach/map.h>
+#include <asm/sched_clock.h>
#include <asm/mach/time.h>
#define SIRFSOC_TIMER_COUNTER_LO 0x0000
@@ -165,21 +166,9 @@
};
/* Overwrite weak default sched_clock with more precise one */
-unsigned long long notrace sched_clock(void)
+static u32 notrace sirfsoc_read_sched_clock(void)
{
- static int is_mapped;
-
- /*
- * sched_clock is called earlier than .init of sys_timer
- * if we map timer memory in .init of sys_timer, system
- * will panic due to illegal memory access
- */
- if (!is_mapped) {
- sirfsoc_of_timer_map();
- is_mapped = 1;
- }
-
- return sirfsoc_timer_read(NULL) * (NSEC_PER_SEC / CLOCK_TICK_RATE);
+ return (u32)(sirfsoc_timer_read(NULL) & 0xffffffff);
}
static void __init sirfsoc_clockevent_init(void)
@@ -210,6 +199,8 @@
BUG_ON(rate < CLOCK_TICK_RATE);
BUG_ON(rate % CLOCK_TICK_RATE);
+ sirfsoc_of_timer_map();
+
writel_relaxed(rate / CLOCK_TICK_RATE / 2 - 1, sirfsoc_timer_base + SIRFSOC_TIMER_DIV);
writel_relaxed(0, sirfsoc_timer_base + SIRFSOC_TIMER_COUNTER_LO);
writel_relaxed(0, sirfsoc_timer_base + SIRFSOC_TIMER_COUNTER_HI);
@@ -217,6 +208,8 @@
BUG_ON(clocksource_register_hz(&sirfsoc_clocksource, CLOCK_TICK_RATE));
+ setup_sched_clock(sirfsoc_read_sched_clock, 32, CLOCK_TICK_RATE);
+
BUG_ON(setup_irq(sirfsoc_timer_irq.irq, &sirfsoc_timer_irq));
sirfsoc_clockevent_init();