[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, 2 insertions, 15 deletions

diff --git a/drivers/s390/cio/cio.c b/drivers/s390/cio/cio.c
index c0cb72547256..3db2c386546f 100644
--- a/drivers/s390/cio/cio.c
+++ b/drivers/s390/cio/cio.c
@@ -859,19 +859,6 @@ __disable_subchannel_easy(struct subchannel_id schid, struct schib *schib)
         return -EBUSY; /* uhm... */
 }
 
-/* we can't use the normal udelay here, since it enables external interrupts */
-
-static void udelay_reset(unsigned long usecs)
-{
-        uint64_t start_cc, end_cc;
-
-        asm volatile ("STCK %0" : "=m" (start_cc));
-        do {
-                cpu_relax();
-                asm volatile ("STCK %0" : "=m" (end_cc));
-        } while (((end_cc - start_cc)/4096) < usecs);
-}
-
 static int
 __clear_io_subchannel_easy(struct subchannel_id schid)
 {
@@ -887,7 +874,7 @@ __clear_io_subchannel_easy(struct subchannel_id schid)
                         if (schid_equal(&ti.schid, &schid))
                                 return 0;
                 }
-                udelay_reset(100);
+                udelay_simple(100);
         }
         return -EBUSY;
 }
@@ -895,7 +882,7 @@ __clear_io_subchannel_easy(struct subchannel_id schid)
 static void __clear_chsc_subchannel_easy(void)
 {
         /* It seems we can only wait for a bit here :/ */
-        udelay_reset(100);
+        udelay_simple(100);
 }
 
 static int pgm_check_occured;