erc32 bsp supercedes sis

c/src/lib/libbsp/sparc/erc32/timer/timer.c

@@ -0,0 +1,89 @@
+/*  timer.c
+ *
+ *  This file implements a benchmark timer using the General Purpose Timer on
+ *  the MEC.
+ *
+ *  COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994.
+ *  On-Line Applications Research Corporation (OAR).
+ *  All rights assigned to U.S. Government, 1994.
+ *
+ *  This material may be reproduced by or for the U.S. Government pursuant
+ *  to the copyright license under the clause at DFARS 252.227-7013.  This
+ *  notice must appear in all copies of this file and its derivatives.
+ *
+ *  Ported to ERC32 implementation of the SPARC by On-Line Applications
+ *  Research Corporation (OAR) under contract to the European Space 
+ *  Agency (ESA).
+ *
+ *  ERC32 modifications of respective RTEMS file: COPYRIGHT (c) 1995. 
+ *  European Space Agency.
+ *
+ *  $Id$
+ */
+
+
+#include <bsp.h>
+
+rtems_boolean Timer_driver_Find_average_overhead;
+
+rtems_boolean Timer_driver_Is_initialized = FALSE;
+
+void Timer_initialize()
+{
+  /*
+   *  Timer runs long and accurate enough not to require an interrupt.
+   */
+
+  if ( Timer_driver_Is_initialized == FALSE ) {
+
+    /* approximately 1 us per countdown */
+    ERC32_MEC.General_Purpose_Timer_Scalar  = CLOCK_SPEED - 1;
+    ERC32_MEC.General_Purpose_Timer_Counter = 0xffffffff;
+
+  } else {
+    Timer_driver_Is_initialized = TRUE;
+  }
+
+  ERC32_MEC_Set_General_Purpose_Timer_Control( 
+    ERC32_MEC_TIMER_COUNTER_ENABLE_COUNTING | 
+      ERC32_MEC_TIMER_COUNTER_LOAD_COUNTER
+  );
+
+  ERC32_MEC_Set_General_Purpose_Timer_Control( 
+    ERC32_MEC_TIMER_COUNTER_ENABLE_COUNTING
+  );
+
+}
+
+#define AVG_OVERHEAD      3  /* It typically takes 3.0 microseconds */
+                             /*     to start/stop the timer. */
+#define LEAST_VALID       2  /* Don't trust a value lower than this */
+
+int Read_timer()
+{
+  rtems_unsigned32  total;
+
+  total = ERC32_MEC.General_Purpose_Timer_Counter;
+
+  total = 0xffffffff - total;
+
+  if ( Timer_driver_Find_average_overhead == 1 )
+    return total;          /* in one microsecond units */
+
+  if ( total < LEAST_VALID )
+    return 0;            /* below timer resolution */
+
+  return total - AVG_OVERHEAD;
+}
+
+rtems_status_code Empty_function( void )
+{
+  return RTEMS_SUCCESSFUL;
+}
+
+void Set_find_average_overhead(
+  rtems_boolean find_flag
+)
+{
+  Timer_driver_Find_average_overhead = find_flag;
+}