| Haojian Zhuang | 1b5c225 | 2017-06-01 15:20:46 +0800 | [diff] [blame] | 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 hikey960_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 hikey960_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 | } |