1 files changed, 212 insertions, 0 deletions
diff --git a/c/src/lib/libcpu/powerpc/mpc750/clock/c_clock.c b/c/src/lib/libcpu/powerpc/mpc750/clock/c_clock.c
new file mode 100644
index 0000000000..081939a5da
--- /dev/null
+++ b/c/src/lib/libcpu/powerpc/mpc750/clock/c_clock.c
@@ -0,0 +1,212 @@
+/*
+ *  Clock Tick Device Driver
+ *
+ *  This routine utilizes the Decrementer Register common to the PPC family.
+ *
+ *  The tick frequency is directly programmed to the configured number of
+ *  microseconds per tick.
+ *
+ *  COPYRIGHT (c) 1989-1997.
+ *  On-Line Applications Research Corporation (OAR).
+ *  Copyright assigned to U.S. Government, 1994.
+ *
+ *  The license and distribution terms for this file may in
+ *  the file LICENSE in this distribution or at
+ *  http://www.OARcorp.com/rtems/license.html.
+ *
+ *  $Id$
+ */
+
+#include <bsp.h>
+#include <bsp/irq.h>
+#include <rtems/libio.h>
+#include <stdlib.h>                     /* for atexit() */
+#include <assert.h>
+#include <libcpu/cpu.h>
+
+/*
+ *  Clock ticks since initialization
+ */
+
+volatile rtems_unsigned32 Clock_driver_ticks;
+
+/*
+ *  This is the value programmed into the count down timer.
+ */
+
+rtems_unsigned32 Clock_Decrementer_value;
+
+/*
+ * These are set by clock driver during its init
+ */
+ 
+rtems_device_major_number rtems_clock_major = ~0;
+rtems_device_minor_number rtems_clock_minor;
+
+void clockOff(const rtems_irq_connect_data* unused)
+{
+  if (BSP_Configuration.ticks_per_timeslice)    {
+    /*
+     * Nothing to do as we cannot disable all interrupts and
+     * the decrementer interrupt enable is MSR_EE
+     */
+  }
+}
+static void clockOn(const rtems_irq_connect_data* unused)
+{
+  PPC_Set_decrementer( Clock_Decrementer_value );
+}
+
+/*
+ *  Clock_isr
+ *
+ *  This is the clock tick interrupt handler.
+ *
+ *  Input parameters:
+ *    vector - vector number
+ *
+ *  Output parameters:  NONE
+ *
+ *  Return values:      NONE
+ *
+ */
+void clockIsr()
+{
+  /*
+   *  The driver has seen another tick.
+   */
+
+  PPC_Set_decrementer( Clock_Decrementer_value );
+
+  Clock_driver_ticks += 1;
+
+  /*
+   *  Real Time Clock counter/timer is set to automatically reload.
+   */
+
+  rtems_clock_tick();
+}
+
+int clockIsOn(const rtems_irq_connect_data* unused)
+{
+  unsigned32 msr_value;
+
+  _CPU_MSR_GET( msr_value );
+  if (msr_value & MSR_EE) return 1;
+  return 0;
+}
+
+static rtems_irq_connect_data clockIrqData = {BSP_DECREMENTER,
+					      clockIsr,
+					      clockOn,
+					      clockOff,
+					      clockIsOn};
+					      
+
+/*
+ *  Clock_exit
+ *
+ *  This routine allows the clock driver to exit by masking the interrupt and
+ *  disabling the clock's counter.
+ *
+ *  Input parameters:   NONE
+ *
+ *  Output parameters:  NONE
+ *
+ *  Return values:      NONE
+ *
+ */
+
+void Clock_exit( void )
+{
+  if ( BSP_Configuration.ticks_per_timeslice ) {
+   BSP_remove_rtems_irq_handler (&clockIrqData);
+  }
+}
+ 
+/*
+ *  Clock_initialize
+ *
+ *  This routine initializes the clock driver.
+ *
+ *  Input parameters:
+ *    major - clock device major number
+ *    minor - clock device minor number
+ *    parg  - pointer to optional device driver arguments
+ *
+ *  Output parameters:  NONE
+ *
+ *  Return values:
+ *    rtems_device_driver status code
+ */
+
+rtems_device_driver Clock_initialize(
+  rtems_device_major_number major,
+  rtems_device_minor_number minor,
+  void *pargp
+)
+{
+  Clock_Decrementer_value = (BSP_bus_frequency/4000)*
+                            (BSP_Configuration.microseconds_per_tick/1000);
+
+  if (!BSP_install_rtems_irq_handler (&clockIrqData)) {
+    printk("Unable to initialize system clock\n");
+    rtems_fatal_error_occurred(1);
+  }
+  /* make major/minor avail to others such as shared memory driver */
+ 
+  rtems_clock_major = major;
+  rtems_clock_minor = minor;
+
+  return RTEMS_SUCCESSFUL;
+} /* Clock_initialize */
+ 
+/*
+ *  Clock_control
+ *
+ *  This routine is the clock device driver control entry point.
+ *
+ *  Input parameters:
+ *    major - clock device major number
+ *    minor - clock device minor number
+ *    parg  - pointer to optional device driver arguments
+ *
+ *  Output parameters:  NONE
+ *
+ *  Return values:
+ *    rtems_device_driver status code
+ */
+
+rtems_device_driver Clock_control(
+  rtems_device_major_number major,
+  rtems_device_minor_number minor,
+  void *pargp
+)
+{
+    rtems_unsigned32 isrlevel;
+    rtems_libio_ioctl_args_t *args = pargp;
+ 
+    if (args == 0)
+        goto done;
+ 
+    Clock_Decrementer_value = (BSP_bus_frequency/4000)*
+      (BSP_Configuration.microseconds_per_tick/1000);
+
+    if      (args->command == rtems_build_name('I', 'S', 'R', ' '))
+      clockIsr();
+    else if (args->command == rtems_build_name('N', 'E', 'W', ' '))
+    {
+      if (!BSP_install_rtems_irq_handler (&clockIrqData)) {
+	printk("Error installing clock interrupt handler!\n");
+	rtems_fatal_error_occurred(1);
+      }
+    }
+done:
+    return RTEMS_SUCCESSFUL;
+}
+
+
+
+
+
+