diff --git a/plat/mediatek/mt8183/plat_debug.c b/plat/mediatek/mt8183/plat_debug.c
new file mode 100644
index 0000000..51816db
--- /dev/null
+++ b/plat/mediatek/mt8183/plat_debug.c
@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2019, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <arch_helpers.h>
+#include <common/debug.h>
+#include <lib/mmio.h>
+#include <plat_debug.h>
+#include <platform_def.h>
+
+void circular_buffer_setup(void)
+{
+	/* Clear DBG_CONTROL.lastpc_disable to enable circular buffer */
+	sync_writel(CA15M_DBG_CONTROL,
+		    mmio_read_32(CA15M_DBG_CONTROL) & ~(BIT_CA15M_LASTPC_DIS));
+}
+
+void circular_buffer_unlock(void)
+{
+	unsigned int i;
+
+	/* Disable big vproc external off (set CPU_EXT_BUCK_ISO to 0x0) */
+	sync_writel(VPROC_EXT_CTL, mmio_read_32(VPROC_EXT_CTL) & ~(0x1 << 1));
+
+	/* Release vproc apb mask (set 0x0C53_2008[1] to 0x0) */
+	sync_writel(CA15M_PWR_RST_CTL, mmio_read_32(CA15M_PWR_RST_CTL) & ~(0x1 << 1));
+
+	for (i = 1; i <= 4; ++i)
+		sync_writel(MP1_CPUTOP_PWR_CON + i * 4,
+			    (mmio_read_32(MP1_CPUTOP_PWR_CON + i * 4) & ~(0x4))|(0x4));
+
+	/* Set DFD.en */
+	sync_writel(DFD_INTERNAL_CTL, 0x1);
+}
+
+void circular_buffer_lock(void)
+{
+	/* Clear DFD.en */
+	sync_writel(DFD_INTERNAL_CTL, 0x0);
+}
+
+void clear_all_on_mux(void)
+{
+	sync_writel(MCU_ALL_PWR_ON_CTRL,
+		    mmio_read_32(MCU_ALL_PWR_ON_CTRL) & ~(1 << 2));
+	sync_writel(MCU_ALL_PWR_ON_CTRL,
+		    mmio_read_32(MCU_ALL_PWR_ON_CTRL) & ~(1 << 1));
+}
+
+void l2c_parity_check_setup(void)
+{
+	/* Enable DBG_CONTROL.l2parity_en */
+	sync_writel(CA15M_DBG_CONTROL,
+		    mmio_read_32(CA15M_DBG_CONTROL) | BIT_CA15M_L2PARITY_EN);
+}