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