+
+/*
+ * This function is intended for SHORT delays only.
+ * It will overflow at around 10 seconds @ 400MHz,
+ * or 20 seconds @ 200MHz.
+ */
+unsigned long usec2ticks(unsigned long _usec)
+{
+ unsigned long long usec = _usec;
+
+ usec *= get_tbclk();
+ usec += 999999;
+ do_div(usec, 1000000);
+
+ return usec;
+}