1 /*
2  * Copyright (c) 2015-2019, ARM Limited and Contributors. All rights reserved.
3  *
4  * SPDX-License-Identifier: BSD-3-Clause
5  */
6 
7 #include <stdint.h>
8 
9 #include <platform_def.h>
10 
11 #include <arch.h>
12 
13 #include <rpi_shared.h>
14 
15 /* The power domain tree descriptor */
16 static unsigned char power_domain_tree_desc[] = {
17 	/* Number of root nodes */
18 	PLATFORM_CLUSTER_COUNT,
19 	/* Number of children for the first node */
20 	PLATFORM_CLUSTER0_CORE_COUNT,
21 };
22 
23 /*******************************************************************************
24  * This function returns the ARM default topology tree information.
25  ******************************************************************************/
plat_get_power_domain_tree_desc(void)26 const unsigned char *plat_get_power_domain_tree_desc(void)
27 {
28 	return power_domain_tree_desc;
29 }
30 
31 /*******************************************************************************
32  * This function implements a part of the critical interface between the psci
33  * generic layer and the platform that allows the former to query the platform
34  * to convert an MPIDR to a unique linear index. An error code (-1) is returned
35  * in case the MPIDR is invalid.
36  ******************************************************************************/
plat_core_pos_by_mpidr(u_register_t mpidr)37 int plat_core_pos_by_mpidr(u_register_t mpidr)
38 {
39 	unsigned int cluster_id, cpu_id;
40 
41 	mpidr &= MPIDR_AFFINITY_MASK;
42 	if (mpidr & ~(MPIDR_CLUSTER_MASK | MPIDR_CPU_MASK)) {
43 		return -1;
44 	}
45 
46 	cluster_id = (mpidr >> MPIDR_AFF1_SHIFT) & MPIDR_AFFLVL_MASK;
47 	cpu_id = (mpidr >> MPIDR_AFF0_SHIFT) & MPIDR_AFFLVL_MASK;
48 
49 	if (cluster_id >= PLATFORM_CLUSTER_COUNT) {
50 		return -1;
51 	}
52 
53 	if (cpu_id >= PLATFORM_MAX_CPUS_PER_CLUSTER) {
54 		return -1;
55 	}
56 
57 	return plat_rpi3_calc_core_pos(mpidr);
58 }
59