Patch from John Cotton <john.cotton@nrc.ca>, Charles-Antoine Gauthier

<charles.gauthier@iit.nrc.ca>, and Darlene A. Stewart
<Darlene.Stewart@nrc.ca> to add support for a number of very
significant things:

  + BSPs for many variations on the Motorola MBX8xx board series
  + Cache Manager including initial support for m68040
    and PowerPC
  + Rework of mpc8xx libcpu code so all mpc8xx CPUs now use
    same code base.
  + Rework of eth_comm BSP to utiltize above.

John reports this works on the 821 and 860

1 files changed, 104 insertions, 0 deletions

diff --git a/c/src/lib/libcpu/powerpc/mpc8xx/timer/timer.c b/c/src/lib/libcpu/powerpc/mpc8xx/timer/timer.c
new file mode 100644
index 0000000000..50c2a3e00a
--- /dev/null
+++ b/c/src/lib/libcpu/powerpc/mpc8xx/timer/timer.c
@@ -0,0 +1,104 @@
+/*  timer.c
+ *
+ *  This file manages the interval timer on the PowerPC MPC8xx.
+ *  NOTE: This is not the PIT, but rather the RTEMS interval
+ *        timer
+ *  We shall use the bottom 32 bits of the timebase register,
+ *
+ *  The following was in the 403 version of this file. I don't
+ *  know what it means. JTM 5/19/98
+ *  NOTE: It is important that the timer start/stop overhead be
+ *        determined when porting or modifying this code.
+ *
+ *  Author: Jay Monkman (jmonkman@frasca.com)
+ *  Copywright (C) 1998 by Frasca International, Inc.
+ *
+ *  Derived from c/src/lib/libcpu/ppc/ppc403/timer/timer.c:
+ *
+ *  Author:     Andrew Bray <andy@i-cubed.co.uk>
+ *
+ *  COPYRIGHT (c) 1995 by i-cubed ltd.
+ *
+ *  To anyone who acknowledges that this file is provided "AS IS"
+ *  without any express or implied warranty:
+ *      permission to use, copy, modify, and distribute this file
+ *      for any purpose is hereby granted without fee, provided that
+ *      the above copyright notice and this notice appears in all
+ *      copies, and that the name of i-cubed limited not be used in
+ *      advertising or publicity pertaining to distribution of the
+ *      software without specific, written prior permission.
+ *      i-cubed limited makes no representations about the suitability
+ *      of this software for any purpose.
+ *
+ *  Derived from c/src/lib/libcpu/hppa1_1/timer/timer.c:
+ *
+ *  COPYRIGHT (c) 1989-1998.
+ *  On-Line Applications Research Corporation (OAR).
+ *  Copyright assigned to U.S. Government, 1994.
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.OARcorp.com/rtems/license.html.
+ *
+ *  $Id$
+ */
+
+#include <bsp.h>
+#include <rtems.h>
+#include <mpc8xx.h>
+
+extern rtems_cpu_table           Cpu_table;             /* owned by BSP */
+
+static volatile rtems_unsigned32 Timer_starting;
+static rtems_boolean Timer_driver_Find_average_overhead;
+
+/*
+ *  This is so small that this code will be reproduced where needed.
+ */
+static inline rtems_unsigned32 get_itimer(void)
+{
+   rtems_unsigned32 ret;
+
+   asm volatile ("mftb %0" : "=r" ((ret))); /* TBLO */
+
+   return ret;
+}
+
+void Timer_initialize(void)
+{
+  /* set interrupt level and enable timebase. This should never */
+  /*  generate an interrupt however. */
+  m8xx.tbscr |= M8xx_TBSCR_TBIRQ(4) | M8xx_TBSCR_TBE;
+  
+  Timer_starting = get_itimer();
+}
+
+int Read_timer(void)
+{
+  rtems_unsigned32 clicks;
+  rtems_unsigned32 total;
+
+  clicks = get_itimer();
+
+  total = clicks - Timer_starting;
+
+  if ( Timer_driver_Find_average_overhead == 1 )
+    return total;          /* in XXX microsecond units */
+
+  else {
+    if ( total < Cpu_table.timer_least_valid ) {
+      return 0;            /* below timer resolution */
+    }
+    return (total - Cpu_table.timer_average_overhead);
+  }
+}
+
+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;
+}