From 9e86dd7db7e8cc17a851d348917cbe7cdd489ce1 Mon Sep 17 00:00:00 2001
From: Joel Sherrill <joel.sherrill@OARcorp.com>
Date: Wed, 7 Jun 1995 01:27:28 +0000
Subject: incorporated mc68302 support

---
 c/src/lib/libbsp/m68k/gen68302/clock/ckinit.c | 94 +++++++++++++++++++++++++++
 1 file changed, 94 insertions(+)
 create mode 100644 c/src/lib/libbsp/m68k/gen68302/clock/ckinit.c

(limited to 'c/src/lib/libbsp/m68k/gen68302/clock/ckinit.c')

diff --git a/c/src/lib/libbsp/m68k/gen68302/clock/ckinit.c b/c/src/lib/libbsp/m68k/gen68302/clock/ckinit.c
new file mode 100644
index 0000000000..be3cf6ab21
--- /dev/null
+++ b/c/src/lib/libbsp/m68k/gen68302/clock/ckinit.c
@@ -0,0 +1,94 @@
+/*  Clock_init()
+ *
+ *  This routine initializes Timer 1 for an MC68302.
+ *  The tick frequency is 1 millisecond.
+ *
+ *  Input parameters:  NONE
+ *
+ *  Output parameters:  NONE
+ *
+ *  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 <stdlib.h>			/* for atexit() */
+
+#include <rtems.h>
+#include <bsp.h>
+#include <clockdrv.h>
+#include "m68302.h"
+
+
+#define TMR1_VAL (  RBIT_TMR_RST	/* software reset the timer */\
+		  | RBIT_TMR_ICLK_MASTER16 /* master clock divided by 16 */\
+		  | RBIT_TMR_FRR	/* restart timer after ref reached */\
+		  | RBIT_TMR_ORI)	/* enable interrupt when ref reached */
+#define TRR1_VAL 1000			/* 1000 ticks @ 16MHz/16
+					 *    = 1 millisecond tick.
+					 */
+
+/*
+ *  Clock_driver_ticks is a monotonically increasing counter of the
+ *  number of clock ticks since the driver was initialized.
+ */
+volatile rtems_unsigned32 Clock_driver_ticks;
+
+/*
+ *  Clock_isrs is the number of clock ISRs until the next invocation of
+ *  the RTEMS clock tick routine.  The clock tick device driver
+ *  gets an interrupt once a millisecond and counts down until the
+ *  length of time between the user configured microseconds per tick
+ *  has passed.
+ */
+rtems_unsigned32 Clock_isrs;
+
+
+rtems_device_driver Clock_initialize( 
+  rtems_device_major_number major,
+  rtems_device_minor_number minor,
+  void *pargp,
+  rtems_id tid,
+  rtems_unsigned32 *rval
+)
+{
+  Install_clock( Clock_isr );
+}
+
+
+void Install_clock(
+  rtems_isr_entry clock_isr
+)
+{
+
+  Clock_driver_ticks = 0;
+  Clock_isrs = BSP_Configuration.microseconds_per_tick / 1000;
+
+  if ( BSP_Configuration.ticks_per_timeslice ) {
+/*  set_vector( clock_isr, 137, 1 );*/
+
+    m302.reg.trr1 = TRR1_VAL;		/* set timer reference register */
+    m302.reg.tmr1 = TMR1_VAL;		/* set timer mode register & enable */
+    /*
+     * Enable TIMER1 interrupts only.
+     */
+    m302.reg.imr  = RBIT_IMR_TIMER1;	/* set 68302 int-mask to allow ints */
+
+    atexit( Clock_exit );
+  }
+}
+
+
+void Clock_exit( void )
+{
+  if ( BSP_Configuration.ticks_per_timeslice ) {
+    /* TODO: figure out what to do here */
+    /* do not restore old vector */
+  }
+}
-- 
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