plat/arm/common/arm_ccn.c

   1 /*
   2  * Copyright (c) 2016-2018, 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 <arch.h>
  10 #include <drivers/arm/ccn.h>
  11
  12 #include <plat_arm.h>
  13
  14 static const unsigned char master_to_rn_id_map[] = {
  15         PLAT_ARM_CLUSTER_TO_CCN_ID_MAP
  16 };
  17
  18 static const ccn_desc_t arm_ccn_desc = {
  19         .periphbase = PLAT_ARM_CCN_BASE,
  20         .num_masters = ARRAY_SIZE(master_to_rn_id_map),
  21         .master_to_rn_id_map = master_to_rn_id_map
  22 };
  23
  24 CASSERT(PLAT_ARM_CLUSTER_COUNT == ARRAY_SIZE(master_to_rn_id_map),
  25                 assert_invalid_cluster_count_for_ccn_variant);
  26
  27 /******************************************************************************
  28  * The following functions are defined as weak to allow a platform to override
  29  * the way ARM CCN driver is initialised and used.
  30  *****************************************************************************/
  31 #pragma weak plat_arm_interconnect_init
  32 #pragma weak plat_arm_interconnect_enter_coherency
  33 #pragma weak plat_arm_interconnect_exit_coherency
  34
  35
  36 /******************************************************************************
  37  * Helper function to initialize ARM CCN driver.
  38  *****************************************************************************/
  39 void __init plat_arm_interconnect_init(void)
  40 {
  41         ccn_init(&arm_ccn_desc);
  42 }
  43
  44 /******************************************************************************
  45  * Helper function to place current master into coherency
  46  *****************************************************************************/
  47 void plat_arm_interconnect_enter_coherency(void)
  48 {
  49         ccn_enter_snoop_dvm_domain(1 << MPIDR_AFFLVL1_VAL(read_mpidr_el1()));
  50 }
  51
  52 /******************************************************************************
  53  * Helper function to remove current master from coherency
  54  *****************************************************************************/
  55 void plat_arm_interconnect_exit_coherency(void)
  56 {
  57         ccn_exit_snoop_dvm_domain(1 << MPIDR_AFFLVL1_VAL(read_mpidr_el1()));
  58 }