1 /* 2 * Copyright (c) 2019, 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 <lib/psci/psci.h> 10 11 static const unsigned char plat_power_domain_tree_desc[] = {1, 4}; 12 13 /******************************************************************************* 14 * This function returns the default topology tree information. 15 ******************************************************************************/ plat_get_power_domain_tree_desc(void)16const unsigned char *plat_get_power_domain_tree_desc(void) 17 { 18 return plat_power_domain_tree_desc; 19 } 20 21 /******************************************************************************* 22 * This function implements a part of the critical interface between the psci 23 * generic layer and the platform that allows the former to query the platform 24 * to convert an MPIDR to a unique linear index. An error code (-1) is returned 25 * in case the MPIDR is invalid. 26 ******************************************************************************/ plat_core_pos_by_mpidr(u_register_t mpidr)27int plat_core_pos_by_mpidr(u_register_t mpidr) 28 { 29 unsigned int cluster_id, cpu_id; 30 31 mpidr &= MPIDR_AFFINITY_MASK; 32 33 if (mpidr & ~(MPIDR_CLUSTER_MASK | MPIDR_CPU_MASK)) 34 return -1; 35 36 cluster_id = (mpidr >> MPIDR_AFF1_SHIFT) & MPIDR_AFFLVL_MASK; 37 cpu_id = (mpidr >> MPIDR_AFF0_SHIFT) & MPIDR_AFFLVL_MASK; 38 39 if (cluster_id >= PLATFORM_CLUSTER_COUNT) 40 return -1; 41 42 /* 43 * Validate cpu_id by checking whether it represents a CPU in 44 * one of the two clusters present on the platform. 45 */ 46 if (cpu_id >= PLATFORM_MAX_CPUS_PER_CLUSTER) 47 return -1; 48 49 return (cpu_id + (cluster_id * 4)); 50 } 51 52