diff --git a/plat/arm/css/sgi/include/plat_macros.S b/plat/arm/css/sgi/include/plat_macros.S
new file mode 100644
index 0000000..fe9a66c
--- /dev/null
+++ b/plat/arm/css/sgi/include/plat_macros.S
@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+#ifndef __PLAT_MACROS_S__
+#define __PLAT_MACROS_S__
+
+#include <css_macros.S>
+
+/* ---------------------------------------------
+ * The below required platform porting macro
+ * prints out relevant platform registers
+ * whenever an unhandled exception is taken in
+ * BL31.
+ *
+ * There are currently no platform specific regs
+ * to print.
+ * ---------------------------------------------
+ */
+	.macro plat_crash_print_regs
+	.endm
+#endif /* __PLAT_MACROS_S__ */
diff --git a/plat/arm/css/sgi/include/platform_def.h b/plat/arm/css/sgi/include/platform_def.h
new file mode 100644
index 0000000..62f4059
--- /dev/null
+++ b/plat/arm/css/sgi/include/platform_def.h
@@ -0,0 +1,94 @@
+/*
+ * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef __PLATFORM_DEF_H__
+#define __PLATFORM_DEF_H__
+
+#include <arm_def.h>
+#include <board_arm_def.h>
+#include <board_css_def.h>
+#include <common_def.h>
+#include <css_def.h>
+#include <soc_css_def.h>
+
+#define CSS_SGI_MAX_CORES_PER_CLUSTER	4
+
+/* CPU topology */
+#define PLAT_ARM_CLUSTER_COUNT		2
+#define PLATFORM_CORE_COUNT		(PLAT_ARM_CLUSTER_COUNT *	\
+					CSS_SGI_MAX_CORES_PER_CLUSTER)
+
+#if ARM_BOARD_OPTIMISE_MEM
+
+#if defined(IMAGE_BL31) || defined(IMAGE_BL32)
+# define PLAT_ARM_MMAP_ENTRIES		6
+# define MAX_XLAT_TABLES		4
+#else
+# define PLAT_ARM_MMAP_ENTRIES		10
+# define MAX_XLAT_TABLES		5
+#endif
+
+#if TRUSTED_BOARD_BOOT
+# define PLAT_ARM_MAX_BL1_RW_SIZE	0xA000
+#else
+# define PLAT_ARM_MAX_BL1_RW_SIZE	0x6000
+#endif
+
+#if TRUSTED_BOARD_BOOT
+# define PLAT_ARM_MAX_BL2_SIZE		0x1D000
+#else
+# define PLAT_ARM_MAX_BL2_SIZE		0xC000
+#endif
+
+#endif /* ARM_BOARD_OPTIMISE_MEM */
+
+#define PLAT_ARM_NSTIMER_FRAME_ID	0
+
+#define PLAT_CSS_MHU_BASE		0x45000000
+
+#define PLAT_ARM_TRUSTED_ROM_BASE	0x0
+#define PLAT_ARM_TRUSTED_ROM_SIZE	0x00080000	/* 512KB */
+
+#define PLAT_MAX_PWR_LVL		1
+
+#define PLAT_ARM_G1S_IRQS		ARM_G1S_IRQS,			\
+					CSS_IRQ_MHU
+
+#define PLAT_ARM_G0_IRQS		ARM_G0_IRQS
+
+#define PLAT_ARM_G1S_IRQ_PROPS(grp)	CSS_G1S_IRQ_PROPS(grp)
+#define PLAT_ARM_G0_IRQ_PROPS(grp)	ARM_G0_IRQ_PROPS(grp)
+
+#define CSS_SGI_DEVICE_BASE	(0x20000000)
+#define CSS_SGI_DEVICE_SIZE	(0x20000000)
+#define CSS_SGI_MAP_DEVICE	MAP_REGION_FLAT(		\
+					CSS_SGI_DEVICE_BASE,	\
+					CSS_SGI_DEVICE_SIZE,	\
+					MT_DEVICE | MT_RW | MT_SECURE)
+
+#define PLAT_CSS_SCP_COM_SHARED_MEM_BASE	0x45400000
+#define SGI_BOOT_CFG_ADDR			0x45410000
+#define PLAT_CSS_PRIMARY_CPU_SHIFT		8
+#define PLAT_CSS_PRIMARY_CPU_BIT_WIDTH		6
+
+/* GIC related constants */
+#define PLAT_ARM_GICD_BASE		0x30000000
+#define PLAT_ARM_GICC_BASE		0x2C000000
+#define PLAT_ARM_GICR_BASE		0x300C0000
+
+/* Platform ID address */
+#define SSC_VERSION                     (SSC_REG_BASE + SSC_VERSION_OFFSET)
+#ifndef __ASSEMBLY__
+/* SSC_VERSION related accessors */
+/* Returns the part number of the platform */
+#define GET_SGI_PART_NUM                                       \
+		GET_SSC_VERSION_PART_NUM(mmio_read_32(SSC_VERSION))
+/* Returns the configuration number of the platform */
+#define GET_SGI_CONFIG_NUM                                     \
+		GET_SSC_VERSION_CONFIG(mmio_read_32(SSC_VERSION))
+#endif /* __ASSEMBLY__ */
+
+#endif /* __PLATFORM_DEF_H__ */
diff --git a/plat/arm/css/sgi/include/sgi_plat_config.h b/plat/arm/css/sgi/include/sgi_plat_config.h
new file mode 100644
index 0000000..c9ff1fe
--- /dev/null
+++ b/plat/arm/css/sgi/include/sgi_plat_config.h
@@ -0,0 +1,44 @@
+/*
+ * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef __SGI_PLAT_CONFIG_H__
+#define __SGI_PLAT_CONFIG_H__
+
+#include <arm_gic.h>
+#include <ccn.h>
+#include <gicv3.h>
+
+/* The type of interconnect */
+typedef enum {
+	ARM_CCI = 0,
+	ARM_CCN,
+	ARM_CMN
+} css_inteconn_type_t;
+
+typedef ccn_desc_t inteconn_desc_t;
+
+/* Interconnect configurations */
+typedef struct css_inteconn_config {
+	css_inteconn_type_t ip_type;
+	const inteconn_desc_t *plat_inteconn_desc;
+} css_inteconn_config_t;
+
+/* Topology configurations */
+typedef struct css_topology {
+	const unsigned char *power_tree;
+	unsigned int plat_cluster_core_count;
+} css_topology_t;
+
+typedef struct css_plat_config {
+	const gicv3_driver_data_t *gic_data;
+	const css_inteconn_config_t *inteconn;
+	const css_topology_t *topology;
+} css_plat_config_t;
+
+void plat_config_init(void);
+css_plat_config_t *get_plat_config(void);
+
+#endif /* __SGI_PLAT_CONFIG_H__ */
diff --git a/plat/arm/css/sgi/include/sgi_variant.h b/plat/arm/css/sgi/include/sgi_variant.h
new file mode 100644
index 0000000..5698d0a
--- /dev/null
+++ b/plat/arm/css/sgi/include/sgi_variant.h
@@ -0,0 +1,13 @@
+/*
+ * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef __SGI_VARIANT_H__
+#define __SGI_VARIANT_H__
+
+/* SSC_VERSION values for SGI575 */
+#define SGI575_SSC_VER_PART_NUM		0x0783
+
+#endif /* __SGI_VARIANT_H__ */