bsps: Move benchmark timer to bsps

This patch is a part of the BSP source reorganization.

Update #3285.

1 files changed, 93 insertions, 0 deletions

diff --git a/bsps/arm/csb336/btimer/btimer.c b/bsps/arm/csb336/btimer/btimer.c
new file mode 100644
index 0000000000..66ff4a0bf4
--- /dev/null
+++ b/bsps/arm/csb336/btimer/btimer.c
@@ -0,0 +1,93 @@
+/**
+ *  @file
+ *  @brief Cogent CSB336 Timer driver
+ *
+ * This uses timer 2 for timing measurments.
+ */
+
+/*
+ * Copyright (c) 2004 Cogent Computer Systems
+ *        Written by Jay Monkman <jtm@lopingdog.com>
+ *
+ *  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.
+ */
+
+#include <rtems.h>
+#include <bsp.h>
+#include <rtems/btimer.h>
+#include <mc9328mxl.h>
+
+uint32_t g_start;
+uint32_t g_freq;
+
+bool benchmark_timer_find_average_overhead;
+
+
+/*
+ * Set up Timer 1
+ */
+void benchmark_timer_initialize( void )
+{
+    MC9328MXL_TMR2_TCTL = (MC9328MXL_TMR_TCTL_CLKSRC_PCLK1 |
+                            MC9328MXL_TMR_TCTL_FRR |
+                            MC9328MXL_TMR_TCTL_TEN);
+    /* set prescaler to 1 (register value + 1) */ \
+    MC9328MXL_TMR2_TPRER = 0;
+
+    /* get freq of counter in KHz */
+    g_freq = get_perclk1_freq() / 1000;
+
+    g_start =  MC9328MXL_TMR2_TCN;
+}
+
+/*
+ *  The following controls the behavior of benchmark_timer_read().
+ *
+ *  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 */
+
+benchmark_timer_t benchmark_timer_read( void )
+{
+  uint32_t t;
+  unsigned long long total;
+
+  t =  MC9328MXL_TMR2_TCN;
+  /*
+   *  Total is calculated by taking into account the number of timer overflow
+   *  interrupts since the timer was initialized and clicks since the last
+   *  interrupts.
+   */
+
+  total = (t - g_start);
+
+  /* convert to nanoseconds */
+  total = (total * 1000)/ g_freq;
+
+  if ( benchmark_timer_find_average_overhead == 1 ) {
+    return (int) total;
+  } else if ( total < LEAST_VALID ) {
+      return 0;
+  }
+  /*
+   *  Somehow convert total into microseconds
+   */
+
+  return (total - AVG_OVERHEAD);
+}
+
+void benchmark_timer_disable_subtracting_average_overhead(bool find_flag)
+{
+  benchmark_timer_find_average_overhead = find_flag;
+}
+