2008-08-15 Allan Hessenflow <allanh@kallisti.com>

* ChangeLog, Makefile.am, README, configure.ac, preinstall.am,
	cache/cache.c, cache/cache_.h, clock/clock.c, clock/rtc.c,
	clock/tod.h, include/bf533.h, include/bf537.h, include/cecRegs.h,
	include/coreTimerRegs.h, include/dmaRegs.h, include/ebiuRegs.h,
	include/ethernetRegs.h, include/gpioRegs.h, include/memoryRegs.h,
	include/mmuRegs.h, include/ppiRegs.h, include/rtcRegs.h,
	include/sicRegs.h, include/spiRegs.h, include/sportRegs.h,
	include/timerRegs.h, include/twiRegs.h, include/uartRegs.h,
	include/wdogRegs.h, interrupt/interrupt.c, interrupt/interrupt.h,
	mmu/mmu.c, mmu/mmu.h, network/ethernet.c, network/ethernet.h,
	serial/spi.c, serial/spi.h, serial/sport.c, serial/sport.h,
	serial/twi.c, serial/twi.h, serial/uart.c, serial/uart.h,
	timer/timer.c: New files.

c/src/lib/libcpu/bfin/timer/timer.c

@@ -0,0 +1,106 @@
+/*  Timer for Blackfin
+ *
+ *  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.
+ *  
+ *  Copyright (c) 2006 by Atos Automacao Industrial Ltda.
+ *             written by Alain Schaefer <alain.schaefer@easc.ch>
+ *                    and Antonio Giovanini <antonio@atos.com.br>
+ *
+ *  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.
+ *
+ *  $Id$
+ */
+ 
+
+#include <rtems.h>
+#include <bsp.h>
+
+
+uint32_t         Timer_interrupts;
+rtems_boolean Timer_driver_Find_average_overhead;
+
+/*
+ * Timer_initialize
+ * 
+ * Blackfin processor has a counter for clock cycles.
+ */
+void Timer_initialize( void )
+{
+
+  /*reset counters*/
+  asm ("R2 = 0;");
+  asm ("CYCLES = R2;");
+  asm ("CYCLES2 = R2;");
+  /*start counters*/
+  asm ("R2 = SYSCFG;");
+  asm ("BITSET(R2,1);");
+  asm ("SYSCFG = R2");
+ 
+}
+
+/*
+ *  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          clicks;
+  uint32_t          total;
+  register uint32_t cycles asm ("R2");
+
+  /* stop counter */ 
+  asm("R2 = SYSCFG;");
+  asm("BITCLR(R2,1);");
+  asm("SYSCFG = R2;");
+  asm("R2 = CYCLES;");
+
+
+  clicks = cycles; /* Clock cycles */
+
+  /* converting to microseconds */
+  total = clicks / (CCLK/1000000); 
+
+  if ( Timer_driver_Find_average_overhead == 1 )
+    return total;          /* in XXX microsecond 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;
+}