From 362a4819b3f00f581d272f010d3a42c49a6b9d93 Mon Sep 17 00:00:00 2001
From: Rex-BC Chen <rex-bc.chen@mediatek.corp-partner.google.com>
Date: Thu, 2 Dec 2021 19:17:06 +0800
Subject: [PATCH] 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>
---
 src/soc/mediatek/mt8186/Makefile.inc      |  1 +
 src/soc/mediatek/mt8186/include/soc/dfd.h | 12 ++++++++++++
 src/soc/mediatek/mt8186/soc.c             | 11 +++++++++++
 3 files changed, 24 insertions(+)
 create mode 100644 src/soc/mediatek/mt8186/include/soc/dfd.h

diff --git a/src/soc/mediatek/mt8186/Makefile.inc b/src/soc/mediatek/mt8186/Makefile.inc
index f99bd47d47..0d56f15009 100644
--- a/src/soc/mediatek/mt8186/Makefile.inc
+++ b/src/soc/mediatek/mt8186/Makefile.inc
@@ -46,6 +46,7 @@ romstage-y += ../common/rtc.c ../common/rtc_osc_init.c rtc.c
 ramstage-y += ../common/auxadc.c
 ramstage-y += ../common/ddp.c ddp.c
 ramstage-y += devapc.c
+ramstage-y += ../common/dfd.c
 ramstage-y += ../common/dsi.c ../common/mtk_mipi_dphy.c
 ramstage-y += emi.c
 ramstage-y += ../common/flash_controller.c
diff --git a/src/soc/mediatek/mt8186/include/soc/dfd.h b/src/soc/mediatek/mt8186/include/soc/dfd.h
new file mode 100644
index 0000000000..b2f1388693
--- /dev/null
+++ b/src/soc/mediatek/mt8186/include/soc/dfd.h
@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef SOC_MEDIATEK_MT8186_DFD_H
+#define SOC_MEDIATEK_MT8186_DFD_H
+
+#include <soc/dfd_common.h>
+
+/* DFD dump address and size need to be the same as defined in Kernel DTS. */
+#define DFD_DUMP_ADDRESS	0x6A000000
+#define DFD_DUMP_SIZE		(1 * MiB)
+
+#endif
diff --git a/src/soc/mediatek/mt8186/soc.c b/src/soc/mediatek/mt8186/soc.c
index 3ad83f7a65..7686986e71 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 @@ static void soc_init(struct device *dev)
 	mtk_mmu_disable_l2c_sram();
 	sspm_init();
 	dapc_init();
+
+	if (CONFIG(MTK_DFD))
+		dfd_init();
 }
 
 static struct device_operations soc_ops = {