From 97ca02cb170f870d5a47f92d5b9a79fe4664dca4 Mon Sep 17 00:00:00 2001
From: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Date: Mon, 29 Oct 2018 14:32:49 +0100
Subject: soc/sifive/fu540: Add helper function to get tlclk frequency
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tlclk is not specific to the UART block in the FU540, so let's calculate
its frequency in clock.c.

Change-Id: I270920027f1132253e413a1bf9feb4fe279b651a
Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Reviewed-on: https://review.coreboot.org/c/29335
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Philipp Hug <philipp@hug.cx>
---
 src/soc/sifive/fu540/clock.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

(limited to 'src/soc/sifive/fu540/clock.c')

diff --git a/src/soc/sifive/fu540/clock.c b/src/soc/sifive/fu540/clock.c
index 8aaba35d6c..597b2069db 100644
--- a/src/soc/sifive/fu540/clock.c
+++ b/src/soc/sifive/fu540/clock.c
@@ -250,3 +250,14 @@ int clock_get_coreclk_khz(void)
 		/ (divr + 1)
 		/ (1ul << divq);
 }
+
+/* Get the TileLink clock's frequency, in KHz */
+int clock_get_tlclk_khz(void)
+{
+	/*
+	 * The TileLink bus and most peripherals use tlclk, which is coreclk/2,
+	 * as input.
+	 */
+
+	return clock_get_coreclk_khz() / 2;
+}
-- 
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