mediatek: Move uart, timer and cbmem code to a common directory.

This patch moves uart, timer and cbmem code which can be reused into a
common directory under soc/mediatek.

BUG=b:80501386
BRANCH=none
TEST=the refactored code works fine on the new platform (with the rest
     of the patches applied) and Elm platform

Change-Id: I5210149b324947ee90f1a481b42f0e2e1f7cfc25
Signed-off-by: Tristan Shieh <tristan.shieh@mediatek.com>
Reviewed-on: https://review.coreboot.org/26658
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>

1 files changed, 27 insertions, 0 deletions

diff --git a/src/soc/mediatek/common/cbmem.c b/src/soc/mediatek/common/cbmem.c
new file mode 100644
index 0000000000..8906565bd5
--- /dev/null
+++ b/src/soc/mediatek/common/cbmem.c
@@ -0,0 +1,27 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2018 MediaTek Inc.
+ *
+ * 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 <cbmem.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <symbols.h>
+#include <soc/emi.h>
+
+#define MAX_DRAM_ADDRESS ((uintptr_t)4 * GiB)
+
+void *cbmem_top(void)
+{
+	return (void *)min((uintptr_t)_dram + sdram_size(), MAX_DRAM_ADDRESS);
+}