[S390] Move private simple udelay function to arch/s390/lib/delay.c.

Move cio's private simple udelay function to lib/delay.c and turn it
into something much more readable. So we have all implementations
at one place.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/arch/s390/lib/delay.c b/arch/s390/lib/delay.c
index 0953cee05efc..6ccb9fab055a 100644
--- a/arch/s390/lib/delay.c
+++ b/arch/s390/lib/delay.c
@@ -92,3 +92,16 @@ out:
         local_irq_restore(flags);
         preempt_enable();
 }
+
+/*
+ * Simple udelay variant. To be used on startup and reboot
+ * when the interrupt handler isn't working.
+ */
+void udelay_simple(unsigned long usecs)
+{
+        u64 end;
+
+        end = get_clock() + ((u64) usecs << 12);
+        while (get_clock() < end)
+                cpu_relax();
+}