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 */
16const 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 ******************************************************************************/
30const 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 ******************************************************************************/
41int 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