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authorSimon Glass <sjg@chromium.org>2011-12-10 11:08:03 +0000
committerWolfgang Denk <wd@denx.de>2012-03-18 21:33:53 +0100
commit5ff55390ed80da2570fbeab51bdd2d2a43d4901a (patch)
tree550c76fe55ff7b4d73d24e9ecb61ba2cfe034bbd
parentaacc8c16ee3b4dd2ef6c6b662e71273c31097548 (diff)
bootstage: Define an optional microsecond timer
Define timer_get_boot_us() which returns the number of microseconds since boot. If undefined then we use get_timer() * 1000. We can fit this in a 32-bit register which keeps everyone happy on the efficiency side. It will wrap around after about an hour. If we are still looking at it after an hour then we had better not be timing the boot. Signed-off-by: Simon Glass <sjg@chromium.org>
-rw-r--r--include/common.h7
-rw-r--r--lib/time.c17
2 files changed, 24 insertions, 0 deletions
diff --git a/include/common.h b/include/common.h
index 399363af1c..85eaa77aaf 100644
--- a/include/common.h
+++ b/include/common.h
@@ -207,6 +207,13 @@ typedef void (interrupt_handler_t)(void *);
#endif /* CONFIG_SERIAL_MULTI */
/*
+ * Return the time since boot in microseconds, This is needed for bootstage
+ * and should be defined in CPU- or board-specific code. If undefined then
+ * millisecond resolution will be used (the standard get_timer()).
+ */
+ulong timer_get_boot_us(void);
+
+/*
* General Purpose Utilities
*/
#define min(X, Y) \
diff --git a/lib/time.c b/lib/time.c
index 6e2937b8e7..69edc3d39b 100644
--- a/lib/time.c
+++ b/lib/time.c
@@ -47,3 +47,20 @@ void mdelay(unsigned long msec)
while (msec--)
udelay(1000);
}
+
+ulong __timer_get_boot_us(void)
+{
+ static ulong base_time;
+
+ /*
+ * We can't implement this properly. Return 0 on the first call and
+ * larger values after that.
+ */
+ if (base_time)
+ return get_timer(base_time) * 1000;
+ base_time = get_timer(0);
+ return 0;
+}
+
+ulong timer_get_boot_us(void)
+ __attribute__((weak, alias("__timer_get_boot_us")));