diff --git a/plat/arm/common/aarch64/arm_helpers.S b/plat/arm/common/aarch64/arm_helpers.S
index 25b67f3..daf08fa 100644
--- a/plat/arm/common/aarch64/arm_helpers.S
+++ b/plat/arm/common/aarch64/arm_helpers.S
@@ -30,11 +30,37 @@
 #include <asm_macros.S>
 #include <platform_def.h>
 
-
+	.weak	plat_arm_calc_core_pos
+	.weak	plat_my_core_pos
 	.globl	plat_crash_console_init
 	.globl	plat_crash_console_putc
 
 
+	/* -----------------------------------------------------
+	 *  unsigned int plat_my_core_pos(void)
+	 *  This function uses the plat_arm_calc_core_pos()
+	 *  definition to get the index of the calling CPU.
+	 * -----------------------------------------------------
+	 */
+func plat_my_core_pos
+	mrs	x0, mpidr_el1
+	b	plat_arm_calc_core_pos
+endfunc plat_my_core_pos
+
+	/* -----------------------------------------------------
+	 *  unsigned int plat_arm_calc_core_pos(uint64_t mpidr)
+	 *  Helper function to calculate the core position.
+	 *  With this function: CorePos = (ClusterId * 4) +
+	 *  				  CoreId
+	 * -----------------------------------------------------
+	 */
+func plat_arm_calc_core_pos
+	and	x1, x0, #MPIDR_CPU_MASK
+	and	x0, x0, #MPIDR_CLUSTER_MASK
+	add	x0, x1, x0, LSR #6
+	ret
+endfunc plat_arm_calc_core_pos
+
 	/* ---------------------------------------------
 	 * int plat_crash_console_init(void)
 	 * Function to initialize the crash console
diff --git a/plat/arm/common/arm_bl31_setup.c b/plat/arm/common/arm_bl31_setup.c
index 7e8856b..3fda2ef 100644
--- a/plat/arm/common/arm_bl31_setup.c
+++ b/plat/arm/common/arm_bl31_setup.c
@@ -226,9 +226,6 @@
 
 	/* Initialize power controller before setting up topology */
 	plat_arm_pwrc_setup();
-
-	/* Topologies are best known to the platform. */
-	plat_arm_topology_setup();
 }
 
 void bl31_platform_setup(void)
diff --git a/plat/arm/common/arm_common.mk b/plat/arm/common/arm_common.mk
index bcc3833..eb2f750 100644
--- a/plat/arm/common/arm_common.mk
+++ b/plat/arm/common/arm_common.mk
@@ -83,7 +83,8 @@
 				plat/arm/common/arm_security.c			\
 				plat/arm/common/arm_topology.c			\
 				plat/common/plat_gic.c				\
-				plat/common/aarch64/platform_mp_stack.S
+				plat/common/aarch64/platform_mp_stack.S		\
+				plat/common/aarch64/plat_psci_common.c
 
 ifneq (${TRUSTED_BOARD_BOOT},0)
 
diff --git a/plat/arm/common/arm_pm.c b/plat/arm/common/arm_pm.c
index 67c2b73..3f47309 100644
--- a/plat/arm/common/arm_pm.c
+++ b/plat/arm/common/arm_pm.c
@@ -33,49 +33,37 @@
 #include <errno.h>
 #include <psci.h>
 
-
-/*******************************************************************************
- * ARM standard platform utility function which is used to determine if any
- * platform actions should be performed for the specified affinity instance
- * given its state. Nothing needs to be done if the 'state' is not off or if
- * this is not the highest affinity level which will enter the 'state'.
- ******************************************************************************/
-int32_t arm_do_affinst_actions(unsigned int afflvl, unsigned int state)
-{
-	unsigned int max_phys_off_afflvl;
-
-	assert(afflvl <= MPIDR_AFFLVL1);
-
-	if (state != PSCI_STATE_OFF)
-		return -EAGAIN;
-
-	/*
-	 * Find the highest affinity level which will be suspended and postpone
-	 * all the platform specific actions until that level is hit.
-	 */
-	max_phys_off_afflvl = psci_get_max_phys_off_afflvl();
-	assert(max_phys_off_afflvl != PSCI_INVALID_DATA);
-	if (afflvl != max_phys_off_afflvl)
-		return -EAGAIN;
-
-	return 0;
-}
-
 /*******************************************************************************
  * ARM standard platform handler called to check the validity of the power state
  * parameter.
  ******************************************************************************/
-int arm_validate_power_state(unsigned int power_state)
+int arm_validate_power_state(unsigned int power_state,
+			    psci_power_state_t *req_state)
 {
+	int pstate = psci_get_pstate_type(power_state);
+	int pwr_lvl = psci_get_pstate_pwrlvl(power_state);
+	int i;
+
+	assert(req_state);
+
+	if (pwr_lvl > PLAT_MAX_PWR_LVL)
+		return PSCI_E_INVALID_PARAMS;
+
 	/* Sanity check the requested state */
-	if (psci_get_pstate_type(power_state) == PSTATE_TYPE_STANDBY) {
+	if (pstate == PSTATE_TYPE_STANDBY) {
 		/*
-		 * It's possible to enter standby only on affinity level 0
-		 * (i.e. a CPU on ARM standard platforms).
-		 * Ignore any other affinity level.
+		 * It's possible to enter standby only on power level 0
+		 * Ignore any other power level.
 		 */
-		if (psci_get_pstate_afflvl(power_state) != MPIDR_AFFLVL0)
+		if (pwr_lvl != ARM_PWR_LVL0)
 			return PSCI_E_INVALID_PARAMS;
+
+		req_state->pwr_domain_state[ARM_PWR_LVL0] =
+					ARM_LOCAL_STATE_RET;
+	} else {
+		for (i = ARM_PWR_LVL0; i <= pwr_lvl; i++)
+			req_state->pwr_domain_state[i] =
+					ARM_LOCAL_STATE_OFF;
 	}
 
 	/*
diff --git a/plat/arm/common/arm_topology.c b/plat/arm/common/arm_topology.c
index 94faa9f..cb0bb9c 100644
--- a/plat/arm/common/arm_topology.c
+++ b/plat/arm/common/arm_topology.c
@@ -30,35 +30,49 @@
 
 #include <arch.h>
 #include <psci.h>
+#include <plat_arm.h>
 #include <platform_def.h>
 
-/*
- * Weak definitions use fixed topology. Strong definitions could make topology
- * configurable
- */
-#pragma weak plat_get_aff_count
-#pragma weak plat_get_aff_state
-#pragma weak plat_arm_topology_setup
+#define get_arm_cluster_core_count(mpidr)\
+		(((mpidr) & 0x100) ? PLAT_ARM_CLUSTER1_CORE_COUNT :\
+				PLAT_ARM_CLUSTER0_CORE_COUNT)
+
+/* The power domain tree descriptor which need to be exported by ARM platforms */
+extern const unsigned char arm_power_domain_tree_desc[];
 
 
-unsigned int plat_get_aff_count(unsigned int aff_lvl, unsigned long mpidr)
+/*******************************************************************************
+ * This function returns the ARM default topology tree information.
+ ******************************************************************************/
+const unsigned char *plat_get_power_domain_tree_desc(void)
 {
-	/* Report 1 (absent) instance at levels higher that the cluster level */
-	if (aff_lvl > MPIDR_AFFLVL1)
-		return 1;
-
-	if (aff_lvl == MPIDR_AFFLVL1)
-		return ARM_CLUSTER_COUNT;
-
-	return mpidr & 0x100 ? PLAT_ARM_CLUSTER1_CORE_COUNT :
-				PLAT_ARM_CLUSTER0_CORE_COUNT;
+	return arm_power_domain_tree_desc;
 }
 
-unsigned int plat_get_aff_state(unsigned int aff_lvl, unsigned long mpidr)
+/*******************************************************************************
+ * This function validates an MPIDR by checking whether it falls within the
+ * acceptable bounds. An error code (-1) is returned if an incorrect mpidr
+ * is passed.
+ ******************************************************************************/
+int arm_check_mpidr(u_register_t mpidr)
 {
-	return aff_lvl <= MPIDR_AFFLVL1 ? PSCI_AFF_PRESENT : PSCI_AFF_ABSENT;
-}
+	unsigned int cluster_id, cpu_id;
 
-void plat_arm_topology_setup(void)
-{
+	mpidr &= MPIDR_AFFINITY_MASK;
+
+	if (mpidr & ~(MPIDR_CLUSTER_MASK | MPIDR_CPU_MASK))
+		return -1;
+
+	cluster_id = (mpidr >> MPIDR_AFF1_SHIFT) & MPIDR_AFFLVL_MASK;
+	cpu_id = (mpidr >> MPIDR_AFF0_SHIFT) & MPIDR_AFFLVL_MASK;
+
+	if (cluster_id >= ARM_CLUSTER_COUNT)
+		return -1;
+
+	/* Validate cpu_id by checking whether it represents a CPU in
+	   one of the two clusters present on the platform. */
+	if (cpu_id >= get_arm_cluster_core_count(mpidr))
+		return -1;
+
+	return 0;
 }
diff --git a/plat/arm/common/tsp/arm_tsp.mk b/plat/arm/common/tsp/arm_tsp.mk
index fc6bd93..f285f58 100644
--- a/plat/arm/common/tsp/arm_tsp.mk
+++ b/plat/arm/common/tsp/arm_tsp.mk
@@ -31,6 +31,7 @@
 # TSP source files common to ARM standard platforms
 BL32_SOURCES		+=	drivers/arm/gic/arm_gic.c			\
 				drivers/arm/gic/gic_v2.c			\
+				plat/arm/common/arm_topology.c			\
 				plat/arm/common/tsp/arm_tsp_setup.c		\
 				plat/common/aarch64/platform_mp_stack.S		\
 				plat/common/plat_gic.c