Added files missed by previous merger of SH-2 port.

1 files changed, 53 insertions, 0 deletions

diff --git a/c/src/lib/libcpu/sh/sh7032/delay/delay.c b/c/src/lib/libcpu/sh/sh7032/delay/delay.c
new file mode 100644
index 0000000000..83f48df853
--- /dev/null
+++ b/c/src/lib/libcpu/sh/sh7032/delay/delay.c
@@ -0,0 +1,53 @@
+/*  
+ *  This routine is a simple spin delay
+ *
+ *  Author: Ralf Corsepius (corsepiu@faw.uni-ulm.de)
+ *
+ *  COPYRIGHT (c) 1999, Ralf Corsepius, Ulm, Germany
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ *
+ *  COPYRIGHT (c) 1989-1999.
+ *  On-Line Applications Research Corporation (OAR).
+ *  Copyright assigned to U.S. Government, 1994.
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.OARcorp.com/rtems/license.html.
+ *
+ *  $Id$
+ */
+
+
+#include <rtems.h>
+
+/*
+ *  Simple spin delay in microsecond units for device drivers.
+ *  This is very dependent on the clock speed of the target.
+ *
+ *  Since we don't have a real time clock, this is a very rough
+ *  approximation, assuming that each cycle of the delay loop takes
+ *  approx. 4 machine cycles.
+ *
+ *  e.g.: clicks_per_second = 20MHz
+ *        => 5e-8 secs per instruction
+ *        => 4 * 5e-8 secs per delay loop
+ */
+
+void CPU_delay( unsigned32 microseconds )
+{ 
+  register unsigned32 clicks_per_usec = 
+    rtems_cpu_configuration_get_clicks_per_second() / 1000000 ;
+  register unsigned32 _delay = 
+    (microseconds) * (clicks_per_usec);
+  asm volatile (
+"0:	add  #-4,%0\n
+	nop\n
+	cmp/pl %0\n
+	bt 0b
+	nop"
+     :: "r" (_delay) );
+}