1 files changed, 75 insertions, 0 deletions
diff --git a/bsps/m68k/mrm332/clock/ckinit.c b/bsps/m68k/mrm332/clock/ckinit.c
new file mode 100644
index 0000000000..273ff9abed
--- /dev/null
+++ b/bsps/m68k/mrm332/clock/ckinit.c
@@ -0,0 +1,75 @@
+/*
+ *  This routine initailizes the periodic interrupt timer on
+ *  the Motorola 68332.
+ */
+
+/*
+ *  COPYRIGHT (c) 1989-2014.
+ *  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.org/license/LICENSE.
+ */
+
+#include <stdlib.h>
+#include <bsp.h>
+#include <mrm332.h>
+#include <rtems/clockdrv.h>
+#include <rtems/m68k/sim.h>
+
+#define CLOCK_VECTOR   MRM_PIV
+
+uint32_t                Clock_isrs;         /* ISRs until next tick */
+volatile uint32_t       Clock_driver_ticks; /* ticks since initialization */
+static rtems_isr_entry  Old_ticker;
+
+void Clock_exit( void );
+
+static rtems_isr Clock_isr(rtems_vector_number vector)
+{
+  Clock_driver_ticks += 1;
+
+  if ( Clock_isrs == 1 ) {
+    rtems_clock_tick();
+    Clock_isrs = rtems_configuration_get_microseconds_per_tick() / 1000;
+  }
+  else
+    Clock_isrs -= 1;
+}
+
+static void Install_clock(rtems_isr_entry clock_isr)
+{
+  Clock_driver_ticks = 0;
+  Clock_isrs = rtems_configuration_get_microseconds_per_tick() / 1000;
+
+  Old_ticker = (rtems_isr_entry) set_vector( clock_isr, CLOCK_VECTOR, 1 );
+
+  /* enable 1mS interrupts */
+  *PITR = (unsigned short int)( SAM(0x09,0,PITM) );/* load counter */
+  *PICR = (unsigned short int)                     /* enable interrupt */
+    ( SAM(ISRL_PIT,8,PIRQL) | SAM(CLOCK_VECTOR,0,PIV) );
+
+  atexit( Clock_exit );
+}
+
+void Clock_exit( void )
+{
+  /* shutdown the periodic interrupt */
+  *PICR = (unsigned short int)
+    ( SAM(0,8,PIRQL) | SAM(CLOCK_VECTOR,0,PIV) );
+  /*     ^^ zero disables interrupt */
+
+  /* do not restore old vector */
+}
+
+rtems_device_driver Clock_initialize(
+  rtems_device_major_number major,
+  rtems_device_minor_number minor,
+  void *pargp
+)
+{
+  Install_clock( Clock_isr );
+
+  return RTEMS_SUCCESSFUL;
+}