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-rw-r--r--arch/arm/mach-rpc/time.c15
1 files changed, 9 insertions, 6 deletions
diff --git a/arch/arm/mach-rpc/time.c b/arch/arm/mach-rpc/time.c
index 9a6def14df01..99363ae5cac7 100644
--- a/arch/arm/mach-rpc/time.c
+++ b/arch/arm/mach-rpc/time.c
@@ -24,6 +24,9 @@
#include <asm/mach/time.h>
+#define RPC_CLOCK_FREQ 2000000
+#define RPC_LATCH DIV_ROUND_CLOSEST(RPC_CLOCK_FREQ, HZ)
+
static u32 ioc_timer_gettimeoffset(void)
{
unsigned int count1, count2, status;
@@ -46,23 +49,23 @@ static u32 ioc_timer_gettimeoffset(void)
* and count2.
*/
if (status & (1 << 5))
- offset -= LATCH;
+ offset -= RPC_LATCH;
} else if (count2 > count1) {
/*
* We have just had another interrupt between reading
* count1 and count2.
*/
- offset -= LATCH;
+ offset -= RPC_LATCH;
}
- offset = (LATCH - offset) * (tick_nsec / 1000);
- return ((offset + LATCH/2) / LATCH) * 1000;
+ offset = (RPC_LATCH - offset) * (tick_nsec / 1000);
+ return DIV_ROUND_CLOSEST(offset, RPC_LATCH) * 1000;
}
void __init ioctime_init(void)
{
- ioc_writeb(LATCH & 255, IOC_T0LTCHL);
- ioc_writeb(LATCH >> 8, IOC_T0LTCHH);
+ ioc_writeb(RPC_LATCH & 255, IOC_T0LTCHL);
+ ioc_writeb(RPC_LATCH >> 8, IOC_T0LTCHH);
ioc_writeb(0, IOC_T0GO);
}