1 /*
2  * Copyright (c) 2015-2024, 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 
43 	/*
44 	 * When MT is set, lowest affinity represents the thread ID.
45 	 * Since we only support one thread per core, discard this field
46 	 * so cluster and core IDs go back into Aff1 and Aff0 respectively.
47 	 * The upper bits are also affected, but plat_rpi3_calc_core_pos()
48 	 * does not use them.
49 	 */
50 	if ((read_mpidr() & MPIDR_MT_MASK) != 0) {
51 		if (MPIDR_AFFLVL0_VAL(mpidr) != 0) {
52 			return -1;
53 		}
54 		mpidr >>= MPIDR_AFFINITY_BITS;
55 	}
56 
57 	if (mpidr & ~(MPIDR_CLUSTER_MASK | MPIDR_CPU_MASK)) {
58 		return -1;
59 	}
60 
61 	cluster_id = MPIDR_AFFLVL1_VAL(mpidr);
62 	cpu_id = MPIDR_AFFLVL0_VAL(mpidr);
63 
64 	if (cluster_id >= PLATFORM_CLUSTER_COUNT) {
65 		return -1;
66 	}
67 
68 	if (cpu_id >= PLATFORM_MAX_CPUS_PER_CLUSTER) {
69 		return -1;
70 	}
71 
72 	return plat_rpi3_calc_core_pos(mpidr);
73 }
74