diff --git a/plat/mediatek/mt8183/drivers/mcsi/mcsi.c b/plat/mediatek/mt8183/drivers/mcsi/mcsi.c
new file mode 100644
index 0000000..cbe7f0a
--- /dev/null
+++ b/plat/mediatek/mt8183/drivers/mcsi/mcsi.c
@@ -0,0 +1,211 @@
+/*
+ * Copyright (c) 2019, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <arch.h>
+#include <arch_helpers.h>
+#include <assert.h>
+#include <common/debug.h>
+#include <lib/mmio.h>
+#include <scu.h>
+#include <mcucfg.h>
+#include <drivers/delay_timer.h>
+#include <mcsi/mcsi.h>
+
+#define MAX_CLUSTERS		5
+
+static unsigned long cci_base_addr;
+static unsigned int cci_cluster_ix_to_iface[MAX_CLUSTERS];
+
+void mcsi_init(unsigned long cci_base,
+		unsigned int num_cci_masters)
+{
+	int i;
+
+	assert(cci_base);
+	assert(num_cci_masters < MAX_CLUSTERS);
+
+	cci_base_addr = cci_base;
+
+	for (i = 0; i < num_cci_masters; i++)
+		cci_cluster_ix_to_iface[i] = SLAVE_IFACE_OFFSET(i);
+}
+
+void mcsi_cache_flush(void)
+{
+	/* timeout is 10ms */
+	int timeout = 10000;
+
+	/* to make flush by SF safe, need to disable BIU DCM */
+	mmio_clrbits_32(CCI_CLK_CTRL, 1 << 8);
+	mmio_write_32(cci_base_addr + FLUSH_SF, 0x1);
+
+	for (; timeout; timeout--, udelay(1)) {
+		if ((mmio_read_32(cci_base_addr + FLUSH_SF) & 0x1) == 0x0)
+			break;
+	}
+
+	if (!timeout) {
+		INFO("SF lush timeout\n");
+		return;
+	}
+
+	/* enable BIU DCM as it was */
+	mmio_setbits_32(CCI_CLK_CTRL, 1 << 8);
+}
+
+static inline unsigned long get_slave_iface_base(unsigned long mpidr)
+{
+	/*
+	 * We assume the TF topology code allocates affinity instances
+	 * consecutively from zero.
+	 * It is a programming error if this is called without initializing
+	 * the slave interface to use for this cluster.
+	 */
+	unsigned int cluster_id =
+		(mpidr >> MPIDR_AFF1_SHIFT) & MPIDR_AFFLVL_MASK;
+
+	assert(cluster_id < MAX_CLUSTERS);
+	assert(cci_cluster_ix_to_iface[cluster_id] != 0);
+
+	return cci_base_addr + cci_cluster_ix_to_iface[cluster_id];
+}
+
+void cci_enable_cluster_coherency(unsigned long mpidr)
+{
+	unsigned long slave_base;
+	unsigned int support_ability;
+	unsigned int config = 0;
+	unsigned int pending = 0;
+
+	assert(cci_base_addr);
+	slave_base  = get_slave_iface_base(mpidr);
+	support_ability = mmio_read_32(slave_base);
+
+	pending = (mmio_read_32(
+		   cci_base_addr + SNP_PENDING_REG)) >> SNP_PENDING;
+	while (pending) {
+		pending = (mmio_read_32(
+			   cci_base_addr + SNP_PENDING_REG)) >> SNP_PENDING;
+	}
+
+	if (support_ability & SNP_SUPPORT)
+		config |= SNOOP_EN_BIT;
+	if (support_ability & DVM_SUPPORT)
+		config |= DVM_EN_BIT;
+
+	mmio_write_32(slave_base, support_ability | config);
+
+	/* Wait for the dust to settle down */
+	while (mmio_read_32(cci_base_addr + SNP_PENDING_REG) >> SNP_PENDING)
+		;
+}
+
+#if ERRATA_MCSIB_SW
+#pragma weak mcsib_sw_workaround_main
+#endif
+
+void cci_disable_cluster_coherency(unsigned long mpidr)
+{
+	unsigned long slave_base;
+	unsigned int config = 0;
+
+	assert(cci_base_addr);
+	slave_base = get_slave_iface_base(mpidr);
+
+	while (mmio_read_32(cci_base_addr + SNP_PENDING_REG) >> SNP_PENDING)
+		;
+
+	config = mmio_read_32(slave_base);
+	config &= ~(DVM_EN_BIT | SNOOP_EN_BIT);
+
+	/* Disable Snoops and DVM messages */
+	mmio_write_32(slave_base, config);
+
+#if ERRATA_MCSIB_SW
+	mcsib_sw_workaround_main();
+#endif
+
+	/* Wait for the dust to settle down */
+	while (mmio_read_32(cci_base_addr + SNP_PENDING_REG) >> SNP_PENDING)
+		;
+}
+
+void cci_secure_switch(unsigned int status)
+{
+	unsigned int config;
+
+	config = mmio_read_32(cci_base_addr + CENTRAL_CTRL_REG);
+	if (status == NS_ACC)
+		config |= SECURE_ACC_EN;
+	else
+		config &= ~SECURE_ACC_EN;
+	mmio_write_32(cci_base_addr + CENTRAL_CTRL_REG, config);
+}
+
+void cci_pmu_secure_switch(unsigned int status)
+{
+	unsigned int config;
+
+	config = mmio_read_32(cci_base_addr + CENTRAL_CTRL_REG);
+	if (status == NS_ACC)
+		config |= PMU_SECURE_ACC_EN;
+	else
+		config &= ~PMU_SECURE_ACC_EN;
+	mmio_write_32(cci_base_addr + CENTRAL_CTRL_REG, config);
+}
+
+void cci_init_sf(void)
+{
+	while (mmio_read_32(cci_base_addr + SNP_PENDING_REG) >> SNP_PENDING)
+		;
+	/* init sf1 */
+	mmio_write_32(cci_base_addr + SF_INIT_REG, TRIG_SF1_INIT);
+	while (mmio_read_32(cci_base_addr + SF_INIT_REG) & TRIG_SF1_INIT)
+		;
+	while (!(mmio_read_32(cci_base_addr + SF_INIT_REG) & SF1_INIT_DONE))
+		;
+	/* init sf2 */
+	mmio_write_32(cci_base_addr + SF_INIT_REG, TRIG_SF2_INIT);
+	while (mmio_read_32(cci_base_addr + SF_INIT_REG) & TRIG_SF2_INIT)
+		;
+	while (!(mmio_read_32(cci_base_addr + SF_INIT_REG) & SF2_INIT_DONE))
+		;
+}
+
+void cci_interrupt_en(void)
+{
+	mmio_setbits_32(cci_base_addr + CENTRAL_CTRL_REG, INT_EN);
+}
+
+unsigned long cci_reg_access(unsigned int op, unsigned long offset,
+			     unsigned long val)
+{
+	unsigned long ret = 0;
+
+	if ((cci_base_addr == 0) || (offset > MSCI_MEMORY_SZ))
+		panic();
+
+	switch (op) {
+	case MCSI_REG_ACCESS_READ:
+		ret = mmio_read_32(cci_base_addr + offset);
+		break;
+	case MCSI_REG_ACCESS_WRITE:
+		mmio_write_32(cci_base_addr + offset, val);
+		dsb();
+		break;
+	case MCSI_REG_ACCESS_SET_BITMASK:
+		mmio_setbits_32(cci_base_addr + offset, val);
+		dsb();
+		break;
+	case MCSI_REG_ACCESS_CLEAR_BITMASK:
+		mmio_clrbits_32(cci_base_addr + offset, val);
+		dsb();
+		break;
+	default:
+		break;
+	}
+	return ret;
+}
diff --git a/plat/mediatek/mt8183/drivers/mcsi/mcsi.h b/plat/mediatek/mt8183/drivers/mcsi/mcsi.h
new file mode 100644
index 0000000..c13e22a
--- /dev/null
+++ b/plat/mediatek/mt8183/drivers/mcsi/mcsi.h
@@ -0,0 +1,116 @@
+/*
+ * Copyright (c) 2019, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef MCSI_H
+#define MCSI_H
+
+#define SLAVE_IFACE7_OFFSET		0x1700
+#define SLAVE_IFACE6_OFFSET		0x1600
+#define SLAVE_IFACE5_OFFSET		0x1500
+#define SLAVE_IFACE4_OFFSET		0x1400
+#define SLAVE_IFACE3_OFFSET		0x1300
+#define SLAVE_IFACE2_OFFSET		0x1200
+#define SLAVE_IFACE1_OFFSET		0x1100
+#define SLAVE_IFACE0_OFFSET		0x1000
+#define SLAVE_IFACE_OFFSET(index)	(SLAVE_IFACE0_OFFSET + \
+							(0x100 * (index)))
+/* Control and ID register offsets */
+#define CENTRAL_CTRL_REG		0x0
+#define ERR_FLAG_REG			0x4
+#define SF_INIT_REG			0x10
+#define SF_CTRL_REG			0x14
+#define DCM_CTRL_REG			0x18
+#define ERR_FLAG2_REG			0x20
+#define SNP_PENDING_REG			0x28
+#define ACP_PENDING_REG			0x2c
+#define FLUSH_SF			0x500
+#define SYS_CCE_CTRL			0x2000
+#define MST1_CTRL			0x2100
+#define MTS2_CTRL			0x2200
+#define XBAR_ARAW_ARB			0x3000
+#define XBAR_R_ARB			0x3004
+
+/* Slave interface register offsets */
+#define SNOOP_CTRL_REG			0x0
+#define QOS_CTRL_REG			0x4
+#define QOS_OVERRIDE_REG		0x8
+#define QOS_TARGET_REG			0xc
+#define BD_CTRL_REG			0x40
+
+/* Snoop Control register bit definitions */
+#define DVM_SUPPORT			(1 << 31)
+#define SNP_SUPPORT			(1 << 30)
+#define SHAREABLE_OVWRT			(1 << 2)
+#define DVM_EN_BIT			(1 << 1)
+#define SNOOP_EN_BIT			(1 << 0)
+#define SF2_INIT_DONE			(1 << 17)
+#define SF1_INIT_DONE			(1 << 16)
+#define TRIG_SF2_INIT			(1 << 1)
+#define TRIG_SF1_INIT			(1 << 0)
+
+/* Status register bit definitions */
+#define SNP_PENDING			31
+
+/* Status bit */
+#define NS_ACC				1
+#define S_ACC				0
+
+/* Central control register bit definitions */
+#define PMU_SECURE_ACC_EN		(1 << 4)
+#define INT_EN				(1 << 3)
+#define SECURE_ACC_EN			(1 << 2)
+#define DVM_DIS				(1 << 1)
+#define SNOOP_DIS			(1 << 0)
+
+#define MSCI_MEMORY_SZ			(0x10000)
+
+#define MCSI_REG_ACCESS_READ		(0x0)
+#define MCSI_REG_ACCESS_WRITE		(0x1)
+#define MCSI_REG_ACCESS_SET_BITMASK	(0x2)
+#define MCSI_REG_ACCESS_CLEAR_BITMASK	(0x3)
+
+#define NR_MAX_SLV			(7)
+
+/* ICCS */
+#define CACHE_INSTR_EN			(1 << 2)
+#define IDLE_CACHE			(1 << 3)
+#define USE_SHARED_CACHE		(1 << 4)
+#define CACHE_SHARED_PRE_EN		(1 << 5)
+#define CACHE_SHARED_POST_EN		(1 << 6)
+
+#define ACP_PENDING_MASK		(0x1007f)
+
+#define CCI_CLK_CTRL			(MCUCFG_BASE + 0x660)
+
+#ifndef __ASSEMBLY__
+
+#include <plat/common/common_def.h>
+#include <stdint.h>
+
+/* Function declarations */
+
+/*
+ * The MCSI driver must be initialized with the base address of the
+ * MCSI device in the platform memory map, and the cluster indices for
+ * the MCSI slave interfaces 3 and 4 respectively. These are the fully
+ * coherent ACE slave interfaces of MCSI.
+ * The cluster indices must either be 0 or 1, corresponding to the level 1
+ * affinity instance of the mpidr representing the cluster. A negative cluster
+ * index indicates that no cluster is present on that slave interface.
+ */
+void mcsi_init(unsigned long cci_base,
+		unsigned int num_cci_masters);
+void mcsi_cache_flush(void);
+
+void cci_enable_cluster_coherency(unsigned long mpidr);
+void cci_disable_cluster_coherency(unsigned long mpidr);
+
+void cci_secure_switch(unsigned int ns);
+void cci_init_sf(void);
+unsigned long cci_reg_access(unsigned int op, unsigned long offset, unsigned long val);
+
+#endif /* __ASSEMBLY__ */
+#endif /* MCSI_H */