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Hadi Asyrafi616da772019-06-27 11:34:03 +08001/*
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
11static const unsigned char plat_power_domain_tree_desc[] = {1, 4};
12
13/*******************************************************************************
14 * This function returns the default topology tree information.
15 ******************************************************************************/
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 ******************************************************************************/
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