1 /* 2 * Copyright (c) 2015-2017, ARM Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7 #include <arch.h> 8 #include <platform_def.h> 9 #include <psci.h> 10 11 extern const unsigned char tegra_power_domain_tree_desc[]; 12 #pragma weak plat_core_pos_by_mpidr 13 14 /******************************************************************************* 15 * This function returns the Tegra default topology tree information. 16 ******************************************************************************/ plat_get_power_domain_tree_desc(void)17const unsigned char *plat_get_power_domain_tree_desc(void) 18 { 19 return tegra_power_domain_tree_desc; 20 } 21 22 /******************************************************************************* 23 * This function implements a part of the critical interface between the psci 24 * generic layer and the platform that allows the former to query the platform 25 * to convert an MPIDR to a unique linear index. An error code (-1) is returned 26 * in case the MPIDR is invalid. 27 ******************************************************************************/ plat_core_pos_by_mpidr(u_register_t mpidr)28int plat_core_pos_by_mpidr(u_register_t mpidr) 29 { 30 unsigned int cluster_id, cpu_id; 31 32 cluster_id = (mpidr >> MPIDR_AFF1_SHIFT) & MPIDR_AFFLVL_MASK; 33 cpu_id = (mpidr >> MPIDR_AFF0_SHIFT) & MPIDR_AFFLVL_MASK; 34 35 if (cluster_id >= PLATFORM_CLUSTER_COUNT) 36 return PSCI_E_NOT_PRESENT; 37 38 /* 39 * Validate cpu_id by checking whether it represents a CPU in 40 * one of the two clusters present on the platform. 41 */ 42 if (cpu_id >= PLATFORM_MAX_CPUS_PER_CLUSTER) 43 return PSCI_E_NOT_PRESENT; 44 45 return (cpu_id + (cluster_id * 4)); 46 } 47