tegra_topology.c

/*
 * Copyright (c) 2015, ARM Limited and Contributors. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of ARM nor the names of its contributors may be used
 * to endorse or promote products derived from this software without specific
 * prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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 */

#include <arch_helpers.h>
#include <platform_def.h>
#include <psci.h>

/*******************************************************************************
 * This function implements a part of the critical interface between the psci
 * generic layer and the platform to allow the former to detect the platform
 * topology. psci queries the platform to determine how many affinity instances
 * are present at a particular level for a given mpidr.
 ******************************************************************************/
unsigned int plat_get_aff_count(unsigned int aff_lvl,
				unsigned long mpidr)
{
	switch (aff_lvl) {
	case MPIDR_AFFLVL2:
		/* Last supported affinity level */
		return 1;

	case MPIDR_AFFLVL1:
		/* Return # of clusters */
		return PLATFORM_CLUSTER_COUNT;

	case MPIDR_AFFLVL0:
		/* # of cpus per cluster */
		return PLATFORM_MAX_CPUS_PER_CLUSTER;

	default:
		return PSCI_AFF_ABSENT;
	}
}

/*******************************************************************************
 * This function implements a part of the critical interface between the psci
 * generic layer and the platform to allow the former to detect the state of a
 * affinity instance in the platform topology. psci queries the platform to
 * determine whether an affinity instance is present or absent.
 ******************************************************************************/
unsigned int plat_get_aff_state(unsigned int aff_lvl,
				unsigned long mpidr)
{
	return (aff_lvl <= MPIDR_AFFLVL2) ? PSCI_AFF_PRESENT : PSCI_AFF_ABSENT;
}