plat/st/stm32mp1/stm32mp1_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 <platform_def.h>
   8
   9 #include <lib/psci/psci.h>
  10 #include <plat/common/platform.h>
  11
  12 /* 1 cluster, all cores into */
  13 static const unsigned char stm32mp1_power_domain_tree_desc[] = {
  14         PLATFORM_CLUSTER_COUNT,
  15         PLATFORM_CORE_COUNT,
  16 };
  17
  18 /* This function returns the platform topology */
  19 const unsigned char *plat_get_power_domain_tree_desc(void)
  20 {
  21         return stm32mp1_power_domain_tree_desc;
  22 }
  23
  24 /*******************************************************************************
  25  * This function implements a part of the critical interface between the psci
  26  * generic layer and the platform that allows the former to query the platform
  27  * to convert an MPIDR to a unique linear index. An error code (-1) is returned
  28  * in case the MPIDR is invalid.
  29  ******************************************************************************/
  30 int plat_core_pos_by_mpidr(u_register_t mpidr)
  31 {
  32         unsigned int cluster_id, cpu_id;
  33         u_register_t mpidr_copy = mpidr;
  34
  35         mpidr_copy &= MPIDR_AFFINITY_MASK;
  36
  37         if ((mpidr_copy & ~(MPIDR_CLUSTER_MASK | MPIDR_CPU_MASK)) != 0U) {
  38                 return -1;
  39         }
  40
  41         cluster_id = (mpidr_copy >> MPIDR_AFF1_SHIFT) & MPIDR_AFFLVL_MASK;
  42         cpu_id = (mpidr_copy >> MPIDR_AFF0_SHIFT) & MPIDR_AFFLVL_MASK;
  43
  44         if (cluster_id >= PLATFORM_CLUSTER_COUNT) {
  45                 return -1;
  46         }
  47
  48         /*
  49          * Validate cpu_id by checking whether it represents a CPU in one
  50          * of the two clusters present on the platform.
  51          */
  52         if (cpu_id >= PLATFORM_CORE_COUNT) {
  53                 return -1;
  54         }
  55
  56         return (int)cpu_id;
  57 }