boottime: Enable boot time measurements.

This patch enables boot time measurements for u-boot. It also
includes minor updates as well.

Change-Id: I993c9ad4fa5dab62df2c0a88454a7546d9565d21
Signed-off-by: Jonas Aaberg <jonas.aberg@stericsson.com>
Reviewed-on: http://gerrit.lud.stericsson.com/gerrit/4610
Reviewed-by: Robert ROSENGREN <robert.rosengren@stericsson.com>
Reviewed-by: Michael BRANDT <michael.brandt@stericsson.com>

1 files changed, 37 insertions, 7 deletions

diff --git a/include/boottime.h b/include/boottime.h
index 95f039170..b48696bde 100644
--- a/include/boottime.h
+++ b/include/boottime.h
@@ -28,17 +28,47 @@ struct boottime_entry {
 	u8  name[BOOTTIME_MAX_NAME_LEN];
 };
 
-#ifdef CONFIG_BOOTTIME
+/**
+ * boottime_tag()
+ * Add a sample point with a name now. Shall be called before function "name"
+ * is executed.
+ * @name: Sample point name.
+ */
 void boottime_tag(char *name);
-void boottime_remove_last(void);
+
+/**
+ * boottime_get_entry()
+ *
+ * Loads a boottime measure point information.
+ * @i: boottime measurement point entry.
+ *
+ * Returns a boottime entry. NULL, if not existing.
+ */
 struct boottime_entry *boottime_get_entry(unsigned int i);
+
+/**
+ * boottime_idle_get()
+ *
+ * Returns the amount of time in us that has been spent idling.
+ */
 unsigned long boottime_idle_get(void);
+
+/**
+ * boottime_idle_done()
+ *
+ * Returns the total time since start in us.
+ */
 unsigned long boottime_idle_done(void);
+
+/**
+ * boottime_idle_add()
+ *
+ * This function shall be added to all delay() functions.
+ * The delay time input to delay() shall be provided to this
+ * function as well. It is used to calculate average load
+ * during boot.
+ * @time: time in us.
+ */
 void boottime_idle_add(unsigned long time);
-#else
-#define boottime_tag(x)
-#define boottime_remove_last()
-#define boottime_idle_add(x)
-#endif
 
 #endif