diff --git a/include/plat/arm/common/arm_def.h b/include/plat/arm/common/arm_def.h
index 4447af2..377bfaa 100644
--- a/include/plat/arm/common/arm_def.h
+++ b/include/plat/arm/common/arm_def.h
@@ -30,6 +30,7 @@
 #ifndef __ARM_DEF_H__
 #define __ARM_DEF_H__
 
+#include <arch.h>
 #include <common_def.h>
 #include <platform_def.h>
 #include <tbbr_img_def.h>
@@ -47,6 +48,25 @@
 
 #define ARM_CACHE_WRITEBACK_SHIFT	6
 
+/*
+ * Macros mapping the MPIDR Affinity levels to ARM Platform Power levels. The
+ * power levels have a 1:1 mapping with the MPIDR affinity levels.
+ */
+#define ARM_PWR_LVL0		MPIDR_AFFLVL0
+#define ARM_PWR_LVL1		MPIDR_AFFLVL1
+
+/*
+ *  Macros for local power states in ARM platforms encoded by State-ID field
+ *  within the power-state parameter.
+ */
+/* Local power state for power domains in Run state. */
+#define ARM_LOCAL_STATE_RUN	0
+/* Local power state for retention. Valid only for CPU power domains */
+#define ARM_LOCAL_STATE_RET	1
+/* Local power state for OFF/power-down. Valid for CPU and cluster power
+   domains */
+#define ARM_LOCAL_STATE_OFF	2
+
 /* Memory location options for TSP */
 #define ARM_TRUSTED_SRAM_ID		0
 #define ARM_TRUSTED_DRAM_ID		1
@@ -163,9 +183,22 @@
 
 #define ADDR_SPACE_SIZE			(1ull << 32)
 
-#define PLATFORM_NUM_AFFS		(ARM_CLUSTER_COUNT + \
+#define PLAT_NUM_PWR_DOMAINS		(ARM_CLUSTER_COUNT + \
 					 PLATFORM_CORE_COUNT)
-#define PLATFORM_MAX_AFFLVL		MPIDR_AFFLVL1
+#define PLAT_MAX_PWR_LVL		ARM_PWR_LVL1
+
+/*
+ * This macro defines the deepest retention state possible. A higher state
+ * id will represent an invalid or a power down state.
+ */
+#define PLAT_MAX_RET_STATE		ARM_LOCAL_STATE_RET
+
+/*
+ * This macro defines the deepest power down states possible. Any state ID
+ * higher than this is invalid.
+ */
+#define PLAT_MAX_OFF_STATE		ARM_LOCAL_STATE_OFF
+
 
 #define PLATFORM_CORE_COUNT		(PLAT_ARM_CLUSTER0_CORE_COUNT + \
 					 PLAT_ARM_CLUSTER1_CORE_COUNT)
diff --git a/include/plat/arm/common/plat_arm.h b/include/plat/arm/common/plat_arm.h
index d7eaac1..29f1c90 100644
--- a/include/plat/arm/common/plat_arm.h
+++ b/include/plat/arm/common/plat_arm.h
@@ -159,8 +159,11 @@
 void arm_tzc_setup(void);
 
 /* PM utility functions */
-int32_t arm_do_affinst_actions(unsigned int afflvl, unsigned int state);
-int arm_validate_power_state(unsigned int power_state);
+int arm_validate_power_state(unsigned int power_state,
+			    psci_power_state_t *req_state);
+
+/* Topology utility function */
+int arm_check_mpidr(u_register_t mpidr);
 
 /* BL1 utility functions */
 void arm_bl1_early_platform_setup(void);
@@ -199,7 +202,7 @@
 	unsigned int image_id,
 	uintptr_t *dev_handle,
 	uintptr_t *image_spec);
-void plat_arm_topology_setup(void);
+unsigned int plat_arm_calc_core_pos(u_register_t mpidr);
 
 
 #endif /* __PLAT_ARM_H__ */