soc/mediatek/mt8186: add GIC pre-initialization function

GIC (generic interrupt controller) defines architectural requirements
for handling all interrupt sources and common interrupt controller
programming interface.
GIC needs to be pre-initialized on MT8186, so we add this initialize
function.

TEST=build pass
BUG=b:202871018

Change-Id: I6bf439d0d9e1ca7130a69b9006b957afca8b133c
Signed-off-by: Rex-BC Chen <rex-bc.chen@mediatek.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/59252
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 20 insertions, 0 deletions

diff --git a/src/soc/mediatek/mt8186/gic.c b/src/soc/mediatek/mt8186/gic.c
new file mode 100644
index 0000000000..ac077647af
--- /dev/null
+++ b/src/soc/mediatek/mt8186/gic.c
@@ -0,0 +1,20 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+/*
+ * This file is created based on MT8186 Functional Specification
+ * Chapter number: 4.3
+ */
+
+#include <device/mmio.h>
+#include <soc/addressmap.h>
+#include <soc/gic.h>
+
+void mtk_gic_preinit(void)
+{
+	int i;
+
+	for (i = 3; i < 15; i++) {
+		write32((void *)((uintptr_t)MCUSYS_BASE + 0xA600 + i * 4), 0);
+		write32((void *)((uintptr_t)MCUSYS_BASE + 0xA650 + i * 4), 0xFFFFFFFF);
+	}
+}