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-rw-r--r--c/src/lib/libbsp/arm/raspberrypi/misc/timer.c49
1 files changed, 49 insertions, 0 deletions
diff --git a/c/src/lib/libbsp/arm/raspberrypi/misc/timer.c b/c/src/lib/libbsp/arm/raspberrypi/misc/timer.c
new file mode 100644
index 0000000000..a26be2f7a7
--- /dev/null
+++ b/c/src/lib/libbsp/arm/raspberrypi/misc/timer.c
@@ -0,0 +1,49 @@
+/**
+ * @file
+ *
+ * @ingroup raspberrypi
+ *
+ * @brief Benchmark timer support.
+ */
+
+/*
+ * Copyright (c) 2013 by Alan Cudmore
+ *
+ * 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
+ *
+ */
+
+#include <rtems.h>
+#include <rtems/timerdrv.h>
+#include <bsp/raspberrypi.h>
+
+static bool benchmark_timer_find_average_overhead = false;
+
+static uint64_t benchmark_timer_base;
+
+void benchmark_timer_initialize(void)
+{
+ benchmark_timer_base = BCM2835_REG(BCM2835_GPU_TIMER_CLO);
+}
+
+uint32_t benchmark_timer_read(void)
+{
+ uint32_t delta = BCM2835_REG(BCM2835_GPU_TIMER_CLO) - benchmark_timer_base;
+
+ if (benchmark_timer_find_average_overhead)
+ {
+ return delta;
+ }
+ else
+ {
+ return BCM2835_REG(BCM2835_GPU_TIMER_CLO);
+ }
+}
+
+void benchmark_timer_disable_subtracting_average_overhead(bool find_average_overhead)
+{
+ benchmark_timer_find_average_overhead = find_average_overhead;
+}