plat/arm/css/common/css_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 <assert.h>
   8
   9 #include <plat/common/platform.h>
  10
  11 #include <plat_arm.h>
  12
  13 #if ARM_PLAT_MT
  14 #pragma weak plat_arm_get_cpu_pe_count
  15 #endif
  16
  17 /******************************************************************************
  18  * This function implements a part of the critical interface between the psci
  19  * generic layer and the platform that allows the former to query the platform
  20  * to convert an MPIDR to a unique linear index. An error code (-1) is
  21  * returned in case the MPIDR is invalid.
  22  *****************************************************************************/
  23 int plat_core_pos_by_mpidr(u_register_t mpidr)
  24 {
  25         if (arm_check_mpidr(mpidr) == 0) {
  26 #if ARM_PLAT_MT
  27                 assert((read_mpidr_el1() & MPIDR_MT_MASK) != 0);
  28
  29                 /*
  30                  * The DTB files don't provide the MT bit in the mpidr argument
  31                  * so set it manually before calculating core position
  32                  */
  33                 mpidr |= MPIDR_MT_MASK;
  34 #endif
  35                 return plat_arm_calc_core_pos(mpidr);
  36         }
  37         return -1;
  38 }
  39
  40 #if ARM_PLAT_MT
  41 /******************************************************************************
  42  * This function returns the PE count within the physical cpu corresponding to
  43  * `mpidr`. Now one cpu only have one thread, so just return 1.
  44  *****************************************************************************/
  45 unsigned int plat_arm_get_cpu_pe_count(u_register_t mpidr)
  46 {
  47         return 1;
  48 }
  49 #endif /* ARM_PLAT_MT */