2007-04-25 Ray Xu <xr@trasin.net>

	* Makefile.am, configure.ac: Add lpc22xx support.
	* lpc22xx/clock/clockdrv.c, lpc22xx/include/lpc22xx.h,
	lpc22xx/irq/bsp_irq_asm.S, lpc22xx/timer/lpc_timer.h,
	lpc22xx/timer/timer.c: New (Initial submission).

1 files changed, 115 insertions, 0 deletions

diff --git a/c/src/lib/libcpu/arm/lpc22xx/timer/timer.c b/c/src/lib/libcpu/arm/lpc22xx/timer/timer.c
new file mode 100644
index 0000000000..e92f2800aa
--- /dev/null
+++ b/c/src/lib/libcpu/arm/lpc22xx/timer/timer.c
@@ -0,0 +1,115 @@
+/*
+ * RTL22xx board Timer driver
+ *
+ * This uses Timer1 for timing measurments.
+ *  
+ *  By Ray xu, modify form Mc9328mxl	RTEMS DSP
+ *
+ *  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 <lpc22xx.h>
+#include "lpc_timer.h"
+uint32_t g_start;
+uint32_t g_freq;
+
+#ifndef __cplusplus
+#define bool	int
+#define true	1
+#define false	0
+
+#endif/* __cplusplus */
+
+rtems_boolean Timer_driver_Find_average_overhead;
+
+    
+/*
+ * Set up Timer 1
+ */
+void Timer_initialize( void )
+{
+	T1TCR &= 0; 	 /* disable and clear timer 0  */ 
+       g_start = (T1TC/(LPC22xx_Fpclk/1000000));
+       T1PC  = 0;            /* TC is incrementet on every pclk.*/ 
+	T1MR0 = ((LPC22xx_Fpclk/1000* BSP_Configuration.microseconds_per_tick) / 1000); /* initialize the timer period and prescaler */  
+       T1EMR = 0;  /*No external match*/ 
+	T1TCR = 1; /*enable timer1*/ 
+       g_freq = LPC22xx_Fpclk / 1000;
+}
+
+/*
+ *  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 t;
+  unsigned long long total;
+  
+  t = (T1TC/(LPC22xx_Fpclk/1000000));
+  /*
+   *  Total is calculated by taking into account the number of timer overflow
+   *  interrupts since the timer was initialized and clicks since the last
+   *  interrupts. currently it is not supported
+   */
+
+  total = (t - g_start);
+
+  /* convert to nanoseconds */
+
+  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;
+}
+