[U-Boot] [PATCH] arm: imx-common: introduce back usec2ticks

[Peng Fan]

This commit "2bb014820c49a63902103bac710bc86b5772e843"
do some clean up to use the code in lib/time.c.
But usec2ticks is still being used by security related job ring code.
Bring back the function to avoid build break.

Signed-off-by: Peng Fan <van.freenix at gmail.com>
Cc: Stefano Babic <sbabic at denx.de>
---
 arch/arm/imx-common/timer.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/arch/arm/imx-common/timer.c b/arch/arm/imx-common/timer.c
index 92c7218..bde24af 100644
--- a/arch/arm/imx-common/timer.c
+++ b/arch/arm/imx-common/timer.c
@@ -124,3 +124,20 @@ ulong get_tbclk(void)
 {
 	return gpt_get_clk();
 }
+
+/*
+ * 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)
+{
+	ulong ticks;
+
+	if (usec < 1000)
+		ticks = ((usec * (get_tbclk()/1000)) + 500) / 1000;
+	else
+		ticks = ((usec / 10) * (get_tbclk() / 100000));
+
+	return ticks;
+}
-- 
2.6.2