Tegra: implement per-SoC validate_power_state() handler

The validate_power_state() handler checks the power_state for a valid afflvl
and state id. Although the afflvl check is common, the state ids are implementation
defined.

This patch moves the handler to the tegra/soc folder to allow each SoC to validate
the power_state for supported parameters.
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>

plat/nvidia/tegra/common/tegra_pm.c

@@ -51,27 +51,27 @@ static int system_suspended;
  * The following platform setup functions are weakly defined. They
  * provide typical implementations that will be overridden by a SoC.
  */
-#pragma weak tegra_prepare_cpu_suspend
-#pragma weak tegra_prepare_cpu_on
-#pragma weak tegra_prepare_cpu_off
-#pragma weak tegra_prepare_cpu_on_finish
+#pragma weak tegra_soc_prepare_cpu_suspend
+#pragma weak tegra_soc_prepare_cpu_on
+#pragma weak tegra_soc_prepare_cpu_off
+#pragma weak tegra_soc_prepare_cpu_on_finish
 
-int tegra_prepare_cpu_suspend(unsigned int id, unsigned int afflvl)
+int tegra_soc_prepare_cpu_suspend(unsigned int id, unsigned int afflvl)
 {
 	return PSCI_E_NOT_SUPPORTED;
 }
 
-int tegra_prepare_cpu_on(unsigned long mpidr)
+int tegra_soc_prepare_cpu_on(unsigned long mpidr)
 {
 	return PSCI_E_SUCCESS;
 }
 
-int tegra_prepare_cpu_off(unsigned long mpidr)
+int tegra_soc_prepare_cpu_off(unsigned long mpidr)
 {
 	return PSCI_E_SUCCESS;
 }
 
-int tegra_prepare_cpu_on_finish(unsigned long mpidr)
+int tegra_soc_prepare_cpu_on_finish(unsigned long mpidr)
 {
 	return PSCI_E_SUCCESS;
 }
@@ -134,17 +134,7 @@ unsigned int tegra_get_sys_suspend_power_state(void)
  ******************************************************************************/
 int32_t tegra_validate_power_state(unsigned int power_state)
 {
-	/* Sanity check the requested state */
-	if (psci_get_pstate_type(power_state) == PSTATE_TYPE_STANDBY) {
-		/*
-		 * It's possible to enter standby only on affinity level 0 i.e.
-		 * a cpu on Tegra. Ignore any other affinity level.
-		 */
-		if (psci_get_pstate_afflvl(power_state) != MPIDR_AFFLVL0)
-			return PSCI_E_INVALID_PARAMS;
-	}
-
-	return PSCI_E_SUCCESS;
+	return tegra_soc_validate_power_state(power_state);
 }
 
 /*******************************************************************************
@@ -171,7 +161,7 @@ int tegra_affinst_on(unsigned long mpidr,
 	sec_entry_point[cpu] = sec_entrypoint;
 	flush_dcache_range((uint64_t)&sec_entry_point[cpu], sizeof(uint64_t));
 
-	return tegra_prepare_cpu_on(mpidr);
+	return tegra_soc_prepare_cpu_on(mpidr);
 }
 
 /*******************************************************************************
@@ -194,7 +184,7 @@ void tegra_affinst_off(unsigned int afflvl, unsigned int state)
 	if (afflvl > MPIDR_AFFLVL0)
 		return;
 
-	tegra_prepare_cpu_off(read_mpidr());
+	tegra_soc_prepare_cpu_off(read_mpidr());
 }
 
 /*******************************************************************************
@@ -227,7 +217,7 @@ void tegra_affinst_suspend(unsigned long sec_entrypoint,
 	sec_entry_point[cpu] = sec_entrypoint;
 	flush_dcache_range((uint64_t)&sec_entry_point[cpu], sizeof(uint64_t));
 
-	tegra_prepare_cpu_suspend(id, afflvl);
+	tegra_soc_prepare_cpu_suspend(id, afflvl);
 
 	/* disable GICC */
 	tegra_gic_cpuif_deactivate();
@@ -280,7 +270,7 @@ void tegra_affinst_on_finish(unsigned int afflvl, unsigned int state)
 	/*
 	 * Reset hardware settings.
 	 */
-	tegra_prepare_cpu_on_finish(read_mpidr());
+	tegra_soc_prepare_cpu_on_finish(read_mpidr());
 }
 
 /*******************************************************************************
@@ -338,7 +328,7 @@ int platform_setup_pm(const plat_pm_ops_t **plat_ops)
 	/*
 	 * Reset hardware settings.
 	 */
-	tegra_prepare_cpu_on_finish(read_mpidr());
+	tegra_soc_prepare_cpu_on_finish(read_mpidr());
 
 	/*
 	 * Initialize PM ops struct

plat/nvidia/tegra/include/tegra_private.h

@@ -45,6 +45,9 @@ typedef struct plat_params_from_bl2 {
 	uintptr_t bl32_params;
 } plat_params_from_bl2_t;
 
+/* Declarations for plat_psci_handlers.c */
+int32_t tegra_soc_validate_power_state(unsigned int power_state);
+
 /* Declarations for plat_setup.c */
 const mmap_region_t *plat_get_mmio_map(void);
 uint64_t plat_get_syscnt_freq(void);

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

@@ -49,7 +49,35 @@
 
 static int cpu_powergate_mask[PLATFORM_MAX_CPUS_PER_CLUSTER];
 
-int tegra_prepare_cpu_suspend(unsigned int id, unsigned int afflvl)
+int32_t tegra_soc_validate_power_state(unsigned int power_state)
+{
+	/* Sanity check the requested afflvl */
+	if (psci_get_pstate_type(power_state) == PSTATE_TYPE_STANDBY) {
+		/*
+		 * It's possible to enter standby only on affinity level 0 i.e.
+		 * a cpu on Tegra. Ignore any other affinity level.
+		 */
+		if (psci_get_pstate_afflvl(power_state) != MPIDR_AFFLVL0)
+			return PSCI_E_INVALID_PARAMS;
+	}
+
+	/* Sanity check the requested state id */
+	switch (psci_get_pstate_id(power_state)) {
+	case PSTATE_ID_CORE_POWERDN:
+	case PSTATE_ID_CLUSTER_IDLE:
+	case PSTATE_ID_CLUSTER_POWERDN:
+	case PSTATE_ID_SOC_POWERDN:
+		break;
+
+	default:
+		ERROR("unsupported state id\n");
+		return PSCI_E_NOT_SUPPORTED;
+	}
+
+	return PSCI_E_SUCCESS;
+}
+
+int tegra_soc_prepare_cpu_suspend(unsigned int id, unsigned int afflvl)
 {
 	/* There's nothing to be done for affinity level 1 */
 	if (afflvl == MPIDR_AFFLVL1)
@@ -90,7 +118,7 @@ int tegra_prepare_cpu_suspend(unsigned int id, unsigned int afflvl)
 	return PSCI_E_NOT_SUPPORTED;
 }
 
-int tegra_prepare_cpu_on_finish(unsigned long mpidr)
+int tegra_soc_prepare_cpu_on_finish(unsigned long mpidr)
 {
 	/*
 	 * Check if we are exiting from SOC_POWERDN.
@@ -120,7 +148,7 @@ int tegra_prepare_cpu_on_finish(unsigned long mpidr)
 	return PSCI_E_SUCCESS;
 }
 
-int tegra_prepare_cpu_on(unsigned long mpidr)
+int tegra_soc_prepare_cpu_on(unsigned long mpidr)
 {
 	int cpu = mpidr & MPIDR_CPU_MASK;
 	uint32_t mask = CPU_CORE_RESET_MASK << cpu;
@@ -139,7 +167,7 @@ int tegra_prepare_cpu_on(unsigned long mpidr)
 	return PSCI_E_SUCCESS;
 }
 
-int tegra_prepare_cpu_off(unsigned long mpidr)
+int tegra_soc_prepare_cpu_off(unsigned long mpidr)
 {
 	tegra_fc_cpu_off(mpidr & MPIDR_CPU_MASK);
 	return PSCI_E_SUCCESS;