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 CPU cores */ 22 PLATFORM_CORE_COUNT 23 }; 24 25 /******************************************************************************* 26 * This function returns the HiKey topology tree information. 27 ******************************************************************************/ 28 const unsigned char *plat_get_power_domain_tree_desc(void) 29 { 30 return hikey_power_domain_tree_desc; 31 } 32 33 /******************************************************************************* 34 * This function implements a part of the critical interface between the psci 35 * generic layer and the platform that allows the former to query the platform 36 * to convert an MPIDR to a unique linear index. An error code (-1) is returned 37 * in case the MPIDR is invalid. 38 ******************************************************************************/ 39 int plat_core_pos_by_mpidr(u_register_t mpidr) 40 { 41 unsigned int cluster_id, cpu_id; 42 43 mpidr &= MPIDR_AFFINITY_MASK; 44 45 if (mpidr & ~(MPIDR_CLUSTER_MASK | MPIDR_CPU_MASK)) 46 return -1; 47 48 cluster_id = (mpidr >> MPIDR_AFF1_SHIFT) & MPIDR_AFFLVL_MASK; 49 cpu_id = (mpidr >> MPIDR_AFF0_SHIFT) & MPIDR_AFFLVL_MASK; 50 51 if (cluster_id >= PLATFORM_CLUSTER_COUNT) 52 return -1; 53 54 /* 55 * Validate cpu_id by checking whether it represents a CPU in 56 * one of the two clusters present on the platform. 57 */ 58 if (cpu_id >= PLATFORM_CORE_COUNT_PER_CLUSTER) 59 return -1; 60 61 return (cpu_id + (cluster_id * 4)); 62 } 63