Tegra210: implement 'get_target_pwr_state' handler

This patch implements the handler to calculate the cluster and
system power states for the Tegra210 SoC. The power states
returned by this handler are used by the PSCI library to decide
cache maintenance operations - cluster v cpu.

Change-Id: I93e4139d4cd8a086b51f328e9a76e91428ebcdab
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>

plat/nvidia/tegra/soc/t210/plat_psci_handlers.c

@@ -100,6 +100,39 @@ int32_t tegra_soc_validate_power_state(unsigned int power_state,
 	return PSCI_E_SUCCESS;
 }
 
+/*******************************************************************************
+ * Platform handler to calculate the proper target power level at the
+ * specified affinity level
+ ******************************************************************************/
+plat_local_state_t tegra_soc_get_target_pwr_state(unsigned int lvl,
+					     const plat_local_state_t *states,
+					     unsigned int ncpu)
+{
+	plat_local_state_t target = *states;
+	int cpu = plat_my_core_pos();
+	int core_pos = read_mpidr() & MPIDR_CPU_MASK;
+
+	/* get the power state at this level */
+	if (lvl == MPIDR_AFFLVL1)
+		target = *(states + core_pos);
+	if (lvl == MPIDR_AFFLVL2)
+		target = *(states + cpu);
+
+	/* Cluster idle/power-down */
+	if ((lvl == MPIDR_AFFLVL1) && ((target == PSTATE_ID_CLUSTER_IDLE) ||
+	    (target == PSTATE_ID_CLUSTER_POWERDN))) {
+		return target;
+	}
+
+	/* System Suspend */
+	if (((lvl == MPIDR_AFFLVL2) || (lvl == MPIDR_AFFLVL1)) &&
+	    (target == PSTATE_ID_SOC_POWERDN))
+		return PSTATE_ID_SOC_POWERDN;
+
+	/* default state */
+	return PSCI_LOCAL_STATE_RUN;
+}
+
 int tegra_soc_pwr_domain_suspend(const psci_power_state_t *target_state)
 {
 	u_register_t mpidr = read_mpidr();
@@ -121,14 +154,14 @@ int tegra_soc_pwr_domain_suspend(const psci_power_state_t *target_state)
 
 	} else if (stateid_afflvl1 == PSTATE_ID_CLUSTER_IDLE) {
 
-		assert(stateid_afflvl0 == PLAT_MAX_OFF_STATE);
+		assert(stateid_afflvl0 == PSTATE_ID_CLUSTER_IDLE);
 
 		/* Prepare for cluster idle */
 		tegra_fc_cluster_idle(mpidr);
 
 	} else if (stateid_afflvl1 == PSTATE_ID_CLUSTER_POWERDN) {
 
-		assert(stateid_afflvl0 == PLAT_MAX_OFF_STATE);
+		assert(stateid_afflvl0 == PSTATE_ID_CLUSTER_POWERDN);
 
 		/* Prepare for cluster powerdn */
 		tegra_fc_cluster_powerdn(mpidr);