2004-07-15 Jay Monkman

	* ChangeLog, Makefile.am, clock/.cvsignore, clock/clock.c,
	dbgu/.cvsignore, dbgu/dbgu.c, include/at91rm9200.h,
	include/at91rm9200_dbgu.h, include/at91rm9200_emac.h,
	include/at91rm9200_gpio.h, include/at91rm9200_mem.h,
	include/at91rm9200_pmc.h, include/bits.h, irq/.cvsignore,
	irq/bsp_irq_asm.S, irq/bsp_irq_init.c, irq/irq.c, irq/irq.h,
	pmc/pmc.c, timer/.cvsignore, timer/timer.c: New files.

1 files changed, 111 insertions, 0 deletions

diff --git a/c/src/lib/libcpu/arm/at91rm9200/timer/timer.c b/c/src/lib/libcpu/arm/at91rm9200/timer/timer.c
new file mode 100644
index 0000000000..4ca5fab000
--- /dev/null
+++ b/c/src/lib/libcpu/arm/at91rm9200/timer/timer.c
@@ -0,0 +1,111 @@
+/*
+ * Cogent CSB337 Timer driver
+ *
+ * This uses timer 0 for timing measurments.
+ *
+ * Copyright (c) 2004 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.
+ *
+ *  $Id$
+ */
+
+#include <rtems.h>
+#include <bsp.h>
+#include <at91rm9200.h>
+#include <at91rm9200_pmc.h>
+
+rtems_unsigned16 tstart;
+rtems_boolean Timer_driver_Find_average_overhead;
+unsigned32 tick_time;
+/*
+ * Set up TC0 - 
+ *   timer_clock2 (MCK/8)
+ *   capture mode - this shouldn't matter
+ */
+void Timer_initialize( void )
+{
+    unsigned32 tmr_freq;
+
+    /* since we are using timer_clock2, divide mck by 8 */
+    tmr_freq = at91rm9200_get_mck() / 8;
+
+    TC_TC0_REG(TC_CMR) = TC_CMR_TCCLKS(1);   /* timer_clock2 */
+    TC_TC0_REG(TC_CCR) = (TC_CCR_CLKEN       /* enable the counter */
+                          | TC_CCR_SWTRG);   /* start it up */
+
+    /* tick time in nanoseconds */
+    tick_time = 1000000000/tmr_freq;
+
+}
+
+/*
+ *  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_unsigned16 t;
+  rtems_unsigned32 total;
+  t = TC_TC0_REG(TC_CV);
+
+  /*
+   *  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 * tick_time;
+
+  if ( Timer_driver_Find_average_overhead == 1 )
+    return total;          /* in nanosecond units */
+  else {
+    if ( total < LEAST_VALID )
+      return 0;            /* below timer resolution */
+  /*
+   *  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;
+}
+