diff options
Diffstat (limited to 'plat/nvidia/tegra/common/tegra_topology.c')
-rw-r--r-- | plat/nvidia/tegra/common/tegra_topology.c | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/plat/nvidia/tegra/common/tegra_topology.c b/plat/nvidia/tegra/common/tegra_topology.c new file mode 100644 index 00000000..05930535 --- /dev/null +++ b/plat/nvidia/tegra/common/tegra_topology.c @@ -0,0 +1,46 @@ +/* + * Copyright (c) 2015-2017, ARM Limited and Contributors. All rights reserved. + * + * SPDX-License-Identifier: BSD-3-Clause + */ + +#include <arch.h> +#include <platform_def.h> +#include <psci.h> + +extern const unsigned char tegra_power_domain_tree_desc[]; +#pragma weak plat_core_pos_by_mpidr + +/******************************************************************************* + * This function returns the Tegra default topology tree information. + ******************************************************************************/ +const unsigned char *plat_get_power_domain_tree_desc(void) +{ + return tegra_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; + + 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 PSCI_E_NOT_PRESENT; + + /* + * Validate cpu_id by checking whether it represents a CPU in + * one of the two clusters present on the platform. + */ + if (cpu_id >= PLATFORM_MAX_CPUS_PER_CLUSTER) + return PSCI_E_NOT_PRESENT; + + return (cpu_id + (cluster_id * 4)); +} |