1 files changed, 52 insertions, 0 deletions
diff --git a/cpukit/sapi/src/tcsimpleinstall.c b/cpukit/sapi/src/tcsimpleinstall.c
new file mode 100644
index 0000000000..563edd7c87
--- /dev/null
+++ b/cpukit/sapi/src/tcsimpleinstall.c
@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2015 embedded brains GmbH.  All rights reserved.
+ *
+ *  embedded brains GmbH
+ *  Dornierstr. 4
+ *  82178 Puchheim
+ *  Germany
+ *  <rtems@embedded-brains.de>
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rtems.org/license/LICENSE.
+ */
+
+#if HAVE_CONFIG_H
+  #include "config.h"
+#endif
+
+#include <rtems/timecounter.h>
+
+void rtems_timecounter_simple_install(
+  rtems_timecounter_simple *tc,
+  uint32_t                  frequency_in_hz,
+  uint32_t                  counter_ticks_per_clock_tick,
+  timecounter_get_t        *get_timecount
+)
+{
+  uint32_t power_of_two = 1;
+  uint32_t mask;
+  uint64_t scaler;
+  int i;
+
+  for ( i = 0; i < 32; ++i ) {
+    if ( power_of_two >= counter_ticks_per_clock_tick ) {
+      break;
+    }
+
+    power_of_two *= 2;
+  }
+
+  mask = ( 2 * power_of_two ) - 1;
+  scaler = ( (uint64_t) power_of_two << 32 ) / counter_ticks_per_clock_tick;
+
+  tc->scaler = scaler;
+  tc->real_interval = counter_ticks_per_clock_tick;
+  tc->binary_interval = ( mask + 1 ) / 2;
+  tc->tc.tc_get_timecount = get_timecount;
+  tc->tc.tc_counter_mask = mask;
+  tc->tc.tc_frequency = (uint32_t) ( ( frequency_in_hz * scaler ) >> 32 );
+  tc->tc.tc_quality = RTEMS_TIMECOUNTER_QUALITY_CLOCK_DRIVER;
+  _Timecounter_Install( &tc->tc );
+}