plat/rpi3/rpi3_topology.c

   1 /*
   2  * Copyright (c) 2015-2018, 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 <stdint.h>
  10
  11 #include "rpi3_private.h"
  12
  13 /* The power domain tree descriptor */
  14 static unsigned char power_domain_tree_desc[] = {
  15         /* Number of root nodes */
  16         PLATFORM_CLUSTER_COUNT,
  17         /* Number of children for the first node */
  18         PLATFORM_CLUSTER0_CORE_COUNT,
  19 };
  20
  21 /*******************************************************************************
  22  * This function returns the ARM default topology tree information.
  23  ******************************************************************************/
  24 const unsigned char *plat_get_power_domain_tree_desc(void)
  25 {
  26         return power_domain_tree_desc;
  27 }
  28
  29 /*******************************************************************************
  30  * This function implements a part of the critical interface between the psci
  31  * generic layer and the platform that allows the former to query the platform
  32  * to convert an MPIDR to a unique linear index. An error code (-1) is returned
  33  * in case the MPIDR is invalid.
  34  ******************************************************************************/
  35 int plat_core_pos_by_mpidr(u_register_t mpidr)
  36 {
  37         unsigned int cluster_id, cpu_id;
  38
  39         mpidr &= MPIDR_AFFINITY_MASK;
  40         if (mpidr & ~(MPIDR_CLUSTER_MASK | MPIDR_CPU_MASK)) {
  41                 return -1;
  42         }
  43
  44         cluster_id = (mpidr >> MPIDR_AFF1_SHIFT) & MPIDR_AFFLVL_MASK;
  45         cpu_id = (mpidr >> MPIDR_AFF0_SHIFT) & MPIDR_AFFLVL_MASK;
  46
  47         if (cluster_id >= PLATFORM_CLUSTER_COUNT) {
  48                 return -1;
  49         }
  50
  51         if (cpu_id >= PLATFORM_MAX_CPUS_PER_CLUSTER) {
  52                 return -1;
  53         }
  54
  55         return plat_rpi3_calc_core_pos(mpidr);
  56 }