soc/mediatek/mt8186: initialize DFD

DFD (Design for Debug) is a debugging tool, which scans flip-flops
and dumps to internal RAM on the WDT reset. After system reboots,
those values can be shown for debugging using MTK internal parsing
tools.

BUG=b:202871018
TEST=build pass

Signed-off-by: Rex-BC Chen <rex-bc.chen@mediatek.com>
Change-Id: I7b711755022b5d9767019611151fea65e71edc66
Reviewed-on: https://review.coreboot.org/c/coreboot/+/60828
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/soc/mediatek/mt8186/soc.c b/src/soc/mediatek/mt8186/soc.c
index 3ad83f7..7686986 100644
--- a/src/soc/mediatek/mt8186/soc.c
+++ b/src/soc/mediatek/mt8186/soc.c
@@ -1,12 +1,20 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
+#include <bootmem.h>
 #include <device/device.h>
 #include <soc/devapc.h>
+#include <soc/dfd.h>
 #include <soc/emi.h>
 #include <soc/mmu_operations.h>
 #include <soc/sspm.h>
 #include <symbols.h>
 
+void bootmem_platform_add_ranges(void)
+{
+	if (CONFIG(MTK_DFD))
+		bootmem_add_range(DFD_DUMP_ADDRESS, DFD_DUMP_SIZE, BM_MEM_RESERVED);
+}
+
 static void soc_read_resources(struct device *dev)
 {
 	ram_resource(dev, 0, (uintptr_t)_dram / KiB, sdram_size() / KiB);
@@ -17,6 +25,9 @@
 	mtk_mmu_disable_l2c_sram();
 	sspm_init();
 	dapc_init();
+
+	if (CONFIG(MTK_DFD))
+		dfd_init();
 }
 
 static struct device_operations soc_ops = {