plat/hisilicon/hikey960/hikey960_topology.c

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