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