[S390] delay: implement ndelay
Implement ndelay() on s390 as well.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/lib/delay.c b/arch/s390/lib/delay.c
index 0f53110..a65229d 100644
--- a/arch/s390/lib/delay.c
+++ b/arch/s390/lib/delay.c
@@ -12,6 +12,7 @@
#include <linux/module.h>
#include <linux/irqflags.h>
#include <linux/interrupt.h>
+#include <asm/div64.h>
void __delay(unsigned long loops)
{
@@ -116,3 +117,17 @@
while (get_clock() < end)
cpu_relax();
}
+
+void __ndelay(unsigned long long nsecs)
+{
+ u64 end;
+
+ nsecs <<= 9;
+ do_div(nsecs, 125);
+ end = get_clock() + nsecs;
+ if (nsecs & ~0xfffUL)
+ __udelay(nsecs >> 12);
+ while (get_clock() < end)
+ barrier();
+}
+EXPORT_SYMBOL(__ndelay);