1 files changed, 108 insertions, 0 deletions
diff --git a/c/src/lib/libbsp/m68k/mvme136/timer/timer.c b/c/src/lib/libbsp/m68k/mvme136/timer/timer.c
new file mode 100644
index 0000000000..8c3ecd45f2
--- /dev/null
+++ b/c/src/lib/libbsp/m68k/mvme136/timer/timer.c
@@ -0,0 +1,108 @@
+/*  Timer_init()
+ *
+ *  This routine initializes the Z8036 timer on the MVME136 board.
+ *
+ *  Input parameters:  NONE
+ *
+ *  Output parameters:  NONE
+ *
+ *  NOTE: This routine will not work if the optimizer is enabled
+ *        for some compilers.  The multiple writes to the Z8036
+ *        may be optimized away.
+ *
+ *        It is important that the timer start/stop overhead be
+ *        determined when porting or modifying this code.
+ *
+ *  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.
+ *
+ *  $Id$
+ */
+
+
+#include <rtems.h>
+#include <bsp.h>
+#include <z8036.h>
+
+#define TIMER 0xfffb0000   /* address of Z8036 on MVME136 */
+
+int Ttimer_val;
+rtems_boolean Timer_driver_Find_average_overhead;
+
+rtems_isr timerisr();
+
+void Timer_initialize()
+{
+  (void) set_vector( timerisr, 66, 0 );       /* install ISR */
+
+  Ttimer_val = 0;                             /* clear timer ISR count */
+  Z8x36_WRITE( TIMER, MASTER_INTR, 0x01 ); /* reset */
+  Z8x36_WRITE( TIMER, MASTER_INTR, 0x00 ); /* clear reset */
+  Z8x36_WRITE( TIMER, MASTER_INTR, 0xe2 ); /* disable lower chain, no vec */
+                                           /*  set right justified addr */
+                                              /*  and master int enable */
+  Z8x36_WRITE( TIMER, CT1_MODE_SPEC,  0x80 ); /* T1 continuous, and   */
+                                              /* cycle/pulse output   */
+
+  *((rtems_unsigned16 *)0xfffb0016) = 0x0000; /* write countdown value */
+/*
+  Z8x36_WRITE( TIMER, CT1_TIME_CONST_MSB, 0x00 );
+  Z8x36_WRITE( TIMER, CT1_TIME_CONST_LSB, 0x00 );
+*/
+  Z8x36_WRITE( TIMER, MASTER_CFG,         0xc4 ); /* enable timer1        */
+
+  Z8x36_WRITE( TIMER, CT1_CMD_STATUS,     0xc6 ); /* set INTR enable (IE), */
+                                                 /*  trigger command      */
+                                                 /*  (TCB) and gate       */
+                                                 /* command (GCB) bits    */
+  *((rtems_unsigned8 *)0xfffb0038) &= 0xfd;      /* enable timer INTR on  */
+                                                 /*    VME controller     */
+}
+
+#define AVG_OVERHEAD      6  /* It typically takes 3.0 microseconds */
+                             /* (6 countdowns) to start/stop the timer. */
+#define LEAST_VALID       10 /* Don't trust a value lower than this */
+
+int Read_timer()
+{
+/*
+  rtems_unsigned8  msb, lsb;
+*/
+  rtems_unsigned32 remaining, total;
+
+  Z8x36_WRITE( TIMER, CT1_CMD_STATUS,  0xce ); /* read the counter value */
+remaining = 0xffff - *((rtems_unsigned16 *) 0xfffb0010);
+/*
+  Z8x36_READ(  TIMER, CT1_CUR_CNT_MSB, msb );
+  Z8x36_READ(  TIMER, CT1_CUR_CNT_LSB, lsb );
+
+  remaining = 0xffff - ((msb << 8) + lsb);
+*/
+  total = (Ttimer_val * 0x10000) + remaining;
+
+  if ( Timer_driver_Find_average_overhead == 1 )
+    return total;          /* in one-half microsecond units */
+
+  else {
+    if ( total < LEAST_VALID )
+      return 0;            /* below timer resolution */
+    return (total-AVG_OVERHEAD) >> 1;
+  }
+}
+
+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;
+}