1 /*
2  * Copyright (c) 2016, ARM Limited and Contributors. All rights reserved.
3  *
4  * SPDX-License-Identifier: BSD-3-Clause
5  */
6 
7 #include <arch.h>
8 #include <ccn.h>
9 #include <plat_arm.h>
10 #include <platform_def.h>
11 
12 static const unsigned char master_to_rn_id_map[] = {
13 	PLAT_ARM_CLUSTER_TO_CCN_ID_MAP
14 };
15 
16 static const ccn_desc_t arm_ccn_desc = {
17 	.periphbase = PLAT_ARM_CCN_BASE,
18 	.num_masters = ARRAY_SIZE(master_to_rn_id_map),
19 	.master_to_rn_id_map = master_to_rn_id_map
20 };
21 
22 CASSERT(PLAT_ARM_CLUSTER_COUNT == ARRAY_SIZE(master_to_rn_id_map),
23 		assert_invalid_cluster_count_for_ccn_variant);
24 
25 /******************************************************************************
26  * The following functions are defined as weak to allow a platform to override
27  * the way ARM CCN driver is initialised and used.
28  *****************************************************************************/
29 #pragma weak plat_arm_interconnect_init
30 #pragma weak plat_arm_interconnect_enter_coherency
31 #pragma weak plat_arm_interconnect_exit_coherency
32 
33 
34 /******************************************************************************
35  * Helper function to initialize ARM CCN driver.
36  *****************************************************************************/
plat_arm_interconnect_init(void)37 void plat_arm_interconnect_init(void)
38 {
39 	ccn_init(&arm_ccn_desc);
40 }
41 
42 /******************************************************************************
43  * Helper function to place current master into coherency
44  *****************************************************************************/
plat_arm_interconnect_enter_coherency(void)45 void plat_arm_interconnect_enter_coherency(void)
46 {
47 	ccn_enter_snoop_dvm_domain(1 << MPIDR_AFFLVL1_VAL(read_mpidr_el1()));
48 }
49 
50 /******************************************************************************
51  * Helper function to remove current master from coherency
52  *****************************************************************************/
plat_arm_interconnect_exit_coherency(void)53 void plat_arm_interconnect_exit_coherency(void)
54 {
55 	ccn_exit_snoop_dvm_domain(1 << MPIDR_AFFLVL1_VAL(read_mpidr_el1()));
56 }
57