plat/hisilicon/hikey/hikey_topology.c

/*
 * Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */
#include <arch.h>
#include <platform_def.h>
#include <psci.h>

/*
 * The HiKey power domain tree descriptor. The cluster power domains
 * are arranged so that when the PSCI generic code creates the power
 * domain tree, the indices of the CPU power domain nodes it allocates
 * match the linear indices returned by plat_core_pos_by_mpidr().
 */
const unsigned char hikey_power_domain_tree_desc[] = {
	/* Number of root nodes */
	1,
	/* Number of clusters */
	PLATFORM_CLUSTER_COUNT,
	/* Number of CPU cores */
	PLATFORM_CORE_COUNT
};

/*******************************************************************************
 * This function returns the HiKey topology tree information.
 ******************************************************************************/
const unsigned char *plat_get_power_domain_tree_desc(void)
{
	return hikey_power_domain_tree_desc;
}

/*******************************************************************************
 * This function implements a part of the critical interface between the psci
 * generic layer and the platform that allows the former to query the platform
 * to convert an MPIDR to a unique linear index. An error code (-1) is returned
 * in case the MPIDR is invalid.
 ******************************************************************************/
int plat_core_pos_by_mpidr(u_register_t mpidr)
{
	unsigned int cluster_id, cpu_id;

	mpidr &= MPIDR_AFFINITY_MASK;

	if (mpidr & ~(MPIDR_CLUSTER_MASK | MPIDR_CPU_MASK))
		return -1;

	cluster_id = (mpidr >> MPIDR_AFF1_SHIFT) & MPIDR_AFFLVL_MASK;
	cpu_id = (mpidr >> MPIDR_AFF0_SHIFT) & MPIDR_AFFLVL_MASK;

	if (cluster_id >= PLATFORM_CLUSTER_COUNT)
		return -1;

	/*
	 * Validate cpu_id by checking whether it represents a CPU in
	 * one of the two clusters present on the platform.
	 */
	if (cpu_id >= PLATFORM_CORE_COUNT_PER_CLUSTER)
		return -1;

	return (cpu_id + (cluster_id * 4));
}