1 /* 2 * Copyright (c) 2017, ARM Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7 #include <platform_def.h> 8 9 #include <arch.h> 10 #include <lib/psci/psci.h> 11 12 /* 13 * The HiKey power domain tree descriptor. The cluster power domains 14 * are arranged so that when the PSCI generic code creates the power 15 * domain tree, the indices of the CPU power domain nodes it allocates 16 * match the linear indices returned by plat_core_pos_by_mpidr(). 17 */ 18 const unsigned char hikey_power_domain_tree_desc[] = { 19 /* Number of root nodes */ 20 1, 21 /* Number of clusters */ 22 PLATFORM_CLUSTER_COUNT, 23 /* Number of children for the first cluster node */ 24 PLATFORM_CORE_COUNT_PER_CLUSTER, 25 /* Number of children for the second cluster node */ 26 PLATFORM_CORE_COUNT_PER_CLUSTER, 27 }; 28 29 /******************************************************************************* 30 * This function returns the HiKey topology tree information. 31 ******************************************************************************/ plat_get_power_domain_tree_desc(void)32const unsigned char *plat_get_power_domain_tree_desc(void) 33 { 34 return hikey_power_domain_tree_desc; 35 } 36 37 /******************************************************************************* 38 * This function implements a part of the critical interface between the psci 39 * generic layer and the platform that allows the former to query the platform 40 * to convert an MPIDR to a unique linear index. An error code (-1) is returned 41 * in case the MPIDR is invalid. 42 ******************************************************************************/ plat_core_pos_by_mpidr(u_register_t mpidr)43int plat_core_pos_by_mpidr(u_register_t mpidr) 44 { 45 unsigned int cluster_id, cpu_id; 46 47 mpidr &= MPIDR_AFFINITY_MASK; 48 49 if (mpidr & ~(MPIDR_CLUSTER_MASK | MPIDR_CPU_MASK)) 50 return -1; 51 52 cluster_id = (mpidr >> MPIDR_AFF1_SHIFT) & MPIDR_AFFLVL_MASK; 53 cpu_id = (mpidr >> MPIDR_AFF0_SHIFT) & MPIDR_AFFLVL_MASK; 54 55 if (cluster_id >= PLATFORM_CLUSTER_COUNT) 56 return -1; 57 58 /* 59 * Validate cpu_id by checking whether it represents a CPU in 60 * one of the two clusters present on the platform. 61 */ 62 if (cpu_id >= PLATFORM_CORE_COUNT_PER_CLUSTER) 63 return -1; 64 65 return (cpu_id + (cluster_id * 4)); 66 } 67