src/sifive: Add the SiFive Freedom Unleashed 540 SoC

The FU540 is the first RISC-V SoC with the necessary resources to run
Linux (an external memory interface, MMU, etc).

More information is available on SiFive's website:
https://www.sifive.com/products/hifive-unleashed/

Change-Id: Ic2a3c7b1dfa56b67cc0571969cc9cf67a770ae43
Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Reviewed-on: https://review.coreboot.org/25789
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

1 files changed, 25 insertions, 0 deletions

diff --git a/src/soc/sifive/fu540/uart.c b/src/soc/sifive/fu540/uart.c
new file mode 100644
index 0000000000..940dc97856
--- /dev/null
+++ b/src/soc/sifive/fu540/uart.c
@@ -0,0 +1,25 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2018 Jonathan Neuschäfer
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <console/uart.h>
+#include <soc/addressmap.h>
+
+uintptr_t uart_platform_base(int idx)
+{
+	if (idx < 2)
+		return FU540_UART(idx);
+	else
+		return 0;
+}