2004-07-15 Jay Monkman

	* ChangeLog, Makefile.am, clock/.cvsignore, clock/clockdrv.c,
	include/mc9328mxl.h, irq/.cvsignore, irq/bsp_irq_asm.S,
	irq/bsp_irq_init.c, irq/irq.c, irq/irq.h, timer/.cvsignore,
	timer/timer.c: New files.

1 files changed, 113 insertions, 0 deletions

diff --git a/c/src/lib/libcpu/arm/mc9328mxl/timer/timer.c b/c/src/lib/libcpu/arm/mc9328mxl/timer/timer.c
new file mode 100644
index 0000000000..ba7c3e8458
--- /dev/null
+++ b/c/src/lib/libcpu/arm/mc9328mxl/timer/timer.c
@@ -0,0 +1,113 @@
+/*
+ * Cogent CSB336 Timer driver
+ *
+ * This uses timer 2 for timing measurments.
+ *
+ * Copyright (c) 2004 Cogent Computer Systems
+ *        Written by Jay Monkman <jtm@lopingdog.com>
+ *	
+ *  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.
+ *
+ * Notes:
+ *  This file manages the benchmark timer used by the RTEMS Timing Test
+ *  Suite.  Each measured time period is demarcated by calls to
+ *  Timer_initialize() and Read_timer().  Read_timer() usually returns
+ *  the number of microseconds since Timer_initialize() exitted.
+ *
+ *  It is important that the timer start/stop overhead be determined 
+ *  when porting or modifying this code.
+ *
+ *  timer.c,v 1.1 2002/11/13 17:55:09 joel Exp
+*/
+
+#include <rtems.h>
+#include <bsp.h>
+#include <mc9328mxl.h>
+
+uint32_t g_start;
+uint32_t g_freq;
+
+rtems_boolean Timer_driver_Find_average_overhead;
+
+    
+/*
+ * Set up Timer 1
+ */
+void Timer_initialize( void )
+{
+    MC9328MXL_TMR2_TCTL = (MC9328MXL_TMR_TCTL_CLKSRC_PCLK1 | 
+                            MC9328MXL_TMR_TCTL_FRR |
+                            MC9328MXL_TMR_TCTL_TEN);
+    /* set prescaler to 1 (register value + 1) */ \
+    MC9328MXL_TMR2_TPRER = 0;
+
+    /* get freq of counter in KHz */
+    g_freq = get_perclk1_freq() / 1000;
+
+    g_start =  MC9328MXL_TMR2_TCN;
+}
+
+/*
+ *  The following controls the behavior of Read_timer().
+ *
+ *  AVG_OVEREHAD is the overhead for starting and stopping the timer.  It
+ *  is usually deducted from the number returned.
+ *
+ *  LEAST_VALID is the lowest number this routine should trust.  Numbers
+ *  below this are "noise" and zero is returned.
+ */
+
+#define AVG_OVERHEAD      0  /* It typically takes X.X microseconds */
+                             /* (Y countdowns) to start/stop the timer. */
+                             /* This value is in microseconds. */
+#define LEAST_VALID       1  /* Don't trust a clicks value lower than this */
+
+int Read_timer( void )
+{
+  rtems_unsigned32 t;
+  unsigned long long total;
+
+  t =  MC9328MXL_TMR2_TCN;
+  /*
+   *  Total is calculated by taking into account the number of timer overflow
+   *  interrupts since the timer was initialized and clicks since the last
+   *  interrupts.
+   */
+
+  total = (t - g_start);
+
+  /* convert to nanoseconds */
+  total = (total * 1000)/ g_freq; 
+
+  if ( Timer_driver_Find_average_overhead == 1 ) {
+    return (int) total; 
+  } else if ( total < LEAST_VALID ) {
+      return 0;       
+  }
+  /*
+   *  Somehow convert total into microseconds
+   */
+
+  return (total - AVG_OVERHEAD);
+}
+
+/*
+ *  Empty function call used in loops to measure basic cost of looping
+ *  in Timing Test Suite.
+ */
+
+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;
+}
+