1 files changed, 105 insertions, 0 deletions
diff --git a/c/src/lib/libbsp/m68k/dmv152/timer/timer.c b/c/src/lib/libbsp/m68k/dmv152/timer/timer.c
new file mode 100644
index 0000000000..2e91a671df
--- /dev/null
+++ b/c/src/lib/libbsp/m68k/dmv152/timer/timer.c
@@ -0,0 +1,105 @@
+/*  timer.c
+ *
+ *  NOTE: These routines 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>
+
+int Ttimer_val;
+rtems_boolean Timer_driver_Find_average_overhead;
+
+rtems_isr timerisr();
+
+void Timer_initialize()
+{
+  rtems_unsigned8 data;
+
+  (void) set_vector( timerisr, TIMER_VECTOR, 0 );  /* install ISR */
+
+  Ttimer_val = 0;                          /* clear timer ISR count */
+  Z8x36_READ ( TIMER, MASTER_INTR, data );
+  Z8x36_WRITE( TIMER, MASTER_INTR, (data & 0x01) );
+
+  Z8x36_WRITE( TIMER, MASTER_CFG, 0xd4 );
+  Z8x36_READ ( TIMER, MASTER_INTR, data );
+  Z8x36_WRITE( TIMER, MASTER_INTR, (data & 0x7E) );
+  Z8x36_WRITE( TIMER, CT1_TIME_CONST_MSB, 0x00 );
+  Z8x36_WRITE( TIMER, CT1_TIME_CONST_LSB, 0x00 );
+  Z8x36_WRITE( TIMER, CT1_MODE_SPEC, 0x87 );
+  Z8x36_WRITE( TIMER, CNT_TMR_VECTOR, TIMER_VECTOR );
+  Z8x36_WRITE( TIMER, CT1_CMD_STATUS, 0x20 );
+  Z8x36_WRITE( TIMER, CT1_CMD_STATUS, 0x26 );
+  Z8x36_READ ( TIMER, MASTER_INTR, data );
+  Z8x36_WRITE( TIMER, MASTER_INTR, (data & 0xDA) | 0x80 );
+
+  Z8x36_WRITE( TIMER, CT1_CMD_STATUS, 0xC6 );
+
+  /*
+   * ACC_IC54 - interrupt 5 will be vectored and mapped to level 6
+   */
+
+  data = (*(rtems_unsigned8 *)0x0D00000B);
+  (*(rtems_unsigned8 *)0x0D00000B) = (data & 0x0F) | 0x60;
+
+}
+
+#define AVG_OVERHEAD      9  /* It typically takes 3.65 microseconds */
+                             /* (9 countdowns) to start/stop the timer. */
+#define LEAST_VALID       10 /* Don't trust a value lower than this */
+
+int Read_timer()
+{
+  rtems_unsigned8 data;
+  rtems_unsigned8  msb, lsb;
+  rtems_unsigned32 remaining, total;
+
+  Z8x36_WRITE( TIMER, CT1_CMD_STATUS,  0xce ); /* read the counter value */
+  Z8x36_READ(  TIMER, CT1_CUR_CNT_MSB, msb );
+  Z8x36_READ(  TIMER, CT1_CUR_CNT_LSB, lsb );
+
+  remaining = 0x10000 - ((msb << 8) + lsb);
+  total = (Ttimer_val * 0x10000) + remaining;
+
+  Z8x36_READ ( TIMER, MASTER_INTR, data );
+  Z8x36_WRITE( TIMER, MASTER_INTR, (data & 0x01) );
+
+  /* do not restore old vector */
+  if ( Timer_driver_Find_average_overhead == 1 )
+    return total;          /* in countdown units */
+
+  if ( total < LEAST_VALID )
+    return 0;            /* below timer resolution */
+
+  /* Clocked at 2.4615 Mhz */
+
+  return (int)(((float)(total-AVG_OVERHEAD)) / 2.4615 * 2.0);
+}
+
+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;
+}