2009-06-04 Xi Yang <hiyangxi@gmail.com>

	* Makefile.am, configure.ac, preinstall.am: New Gumstix BSP and PXA255
	support.
	* pxa255/clock/clock.c, pxa255/ffuart/ffuart.c, pxa255/include/bits.h,
	pxa255/include/ffuart.h, pxa255/include/pxa255.h,
	pxa255/irq/bsp_irq_asm.S, pxa255/irq/bsp_irq_init.c,
	pxa255/irq/irq.c, pxa255/irq/irq.h, pxa255/pmc/pmc.c,
	pxa255/timer/timer.c: New files.

1 files changed, 95 insertions, 0 deletions

diff --git a/c/src/lib/libcpu/arm/pxa255/timer/timer.c b/c/src/lib/libcpu/arm/pxa255/timer/timer.c
new file mode 100755
index 0000000000..2e531715c3
--- /dev/null
+++ b/c/src/lib/libcpu/arm/pxa255/timer/timer.c
@@ -0,0 +1,95 @@
+/*
+ *PXA255 timer by Yang Xi <hiyangxi@gmail.com>
+ * Copyright (c) 2004 by Jay Monkman <jtm@lopingdog.com>
+ *
+ * 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.
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.rtems.com/license/LICENSE.
+ *
+ *  $Id$
+ */
+ *  $Id$
+ */
+
+#include <rtems.h>
+#include <bsp.h>
+#include <pxa255.h>
+
+uint32_t tstart;
+bool Timer_driver_Find_average_overhead;
+static uint32_t tick_time;
+/*
+ * Use the timer count register to measure. 
+ * The frequency of it is 3.4864MHZ
+ *The longest period we are able to capture is 4G/3.4864MHZ
+ *   
+ *   
+ */
+void Timer_initialize( void )
+{
+
+  tick_time = XSCALE_OS_TIMER_TCR;
+
+}
+
+/*
+ *  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 )
+{
+
+  uint32_t total;
+  total = XSCALE_OS_TIMER_TCR;
+  if(total>=tick_time)
+    total -= tick_time;
+  else
+    total += 0xffffffff-tick_time; /*Round up but not overflow*/
+      
+  if ( Timer_driver_Find_average_overhead == 1 )
+    return total;          /*Counter cycles*/
+  else {
+    if ( total < LEAST_VALID )
+      return 0;            /* below timer resolution */
+    return total;
+  }
+
+}
+
+/*
+ *  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(
+  bool find_flag
+)
+{
+  Timer_driver_Find_average_overhead = find_flag;
+}
+