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>

src/soc/mediatek/mt8186/Makefile.inc

@@ -3,6 +3,7 @@ ifeq ($(CONFIG_SOC_MEDIATEK_MT8186),y)
 bootblock-y += bootblock.c
 bootblock-y += ../common/eint_event.c
 bootblock-y += ../common/flash_controller.c
+bootblock-y += gic.c
 bootblock-y += ../common/gpio.c gpio.c
 bootblock-y += ../common/mmu_operations.c
 bootblock-y += ../common/pll.c pll.c

src/soc/mediatek/mt8186/bootblock.c

@@ -2,6 +2,7 @@
 
 #include <bootblock_common.h>
 #include <soc/eint_event.h>
+#include <soc/gic.h>
 #include <soc/mmu_operations.h>
 #include <soc/pll.h>
 #include <soc/wdt.h>
@@ -12,4 +13,5 @@ void bootblock_soc_init(void)
 	mtk_wdt_init();
 	mt_pll_init();
 	unmask_eint_event_mask();
+	mtk_gic_preinit();
 }

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);
+	}
+}

src/soc/mediatek/mt8186/include/soc/gic.h

@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+/*
+ * This file is created based on MT8186 Functional Specification
+ * Chapter number: 4.3
+ */
+
+#ifndef SOC_MEDIATEK_MT8186_GIC_H
+#define SOC_MEDIATEK_MT8186_GIC_H
+
+void mtk_gic_preinit(void);
+
+#endif