1 files changed, 45 insertions, 0 deletions
diff --git a/c/src/libchip/rtc/mc146818a_ioreg.c b/c/src/libchip/rtc/mc146818a_ioreg.c
new file mode 100644
index 0000000000..0ccd398c9d
--- /dev/null
+++ b/c/src/libchip/rtc/mc146818a_ioreg.c
@@ -0,0 +1,45 @@
+/*
+ *  This file contains a typical set of register access routines which may be
+ *  used with the MC146818A chip if accesses to the chip are as follows:
+ *
+ *    + registers are in I/O space
+ *    + registers are accessed as bytes
+ *    + registers are only byte-aligned (no address gaps)
+ *
+ *  COPYRIGHT (c) 1989-1997.
+ *  On-Line Applications Research Corporation (OAR).
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.rtems.com/license/LICENSE.
+ *
+ *  $Id$
+ */
+
+#include <rtems.h>
+#include <bsp.h>
+
+unsigned32 mc146818a_get_register(
+  unsigned32  ulCtrlPort,
+  unsigned8   ucRegNum
+)
+{
+  unsigned8   val;
+  unsigned8   tmp;
+
+  outport_byte( ulCtrlPort, ucRegNum );
+  inport_byte( 0x84, tmp );   /* Hack a delay to give chip time to settle */
+  inport_byte( ulCtrlPort+1, val );
+  inport_byte( 0x84, tmp );   /* Hack a delay to give chip time to settle */
+  return val;
+}
+
+void  mc146818a_set_register(
+  unsigned32  ulCtrlPort,
+  unsigned8   ucRegNum,
+  unsigned32  ucData
+)
+{
+  outport_byte( ulCtrlPort, ucRegNum );
+  outport_byte( ulCtrlPort+1, (unsigned8)ucData );
+}