soc/mediatek/mt8196: Add a stub implementation of the MT8196 SoC

Add new folder and basic drivers for Mediatek SoC 'MT8196'.
Refer to MT8196_Chromebook_Application_Processor_Datasheet_V1.0 for
MT8196 SPEC detail.
This patch also enables UART and ARM arch timer.

TEST=saw the coreboot uart log to bootblock
BUG=b:317009620

Change-Id: I8190253ed000db879b04a806ca0bdf29c14be806
Signed-off-by: Jarried Lin <jarried.lin@mediatek.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/83572
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Yidi Lin <yidilin@google.com>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/src/soc/mediatek/mt8196/timer.c b/src/soc/mediatek/mt8196/timer.c
new file mode 100644
index 0000000000..9d8dd7a9a6
--- /dev/null
+++ b/src/soc/mediatek/mt8196/timer.c
@@ -0,0 +1,10 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <arch/lib_helpers.h>
+#include <commonlib/helpers.h>
+#include <delay.h>
+
+void init_timer(void)
+{
+	raw_write_cntfrq_el0(13 * MHz);
+}