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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/arch/arm/mach-vexpress/mcpm_platsmp.c
4 *
5 * Created by: Nicolas Pitre, November 2012
6 * Copyright: (C) 2012-2013 Linaro Limited
7 *
8 * Code to handle secondary CPU bringup and hotplug for the cluster power API.
9 */
10
11#include <linux/init.h>
12#include <linux/smp.h>
13#include <linux/spinlock.h>
14
15#include <asm/mcpm.h>
16#include <asm/smp.h>
17#include <asm/smp_plat.h>
18
19static void cpu_to_pcpu(unsigned int cpu,
20 unsigned int *pcpu, unsigned int *pcluster)
21{
22 unsigned int mpidr;
23
24 mpidr = cpu_logical_map(cpu);
25 *pcpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
26 *pcluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
27}
28
29static int mcpm_boot_secondary(unsigned int cpu, struct task_struct *idle)
30{
31 unsigned int pcpu, pcluster, ret;
32 extern void secondary_startup(void);
33
34 cpu_to_pcpu(cpu, &pcpu, &pcluster);
35
36 pr_debug("%s: logical CPU %d is physical CPU %d cluster %d\n",
37 __func__, cpu, pcpu, pcluster);
38
39 mcpm_set_entry_vector(pcpu, pcluster, NULL);
40 ret = mcpm_cpu_power_up(pcpu, pcluster);
41 if (ret)
42 return ret;
43 mcpm_set_entry_vector(pcpu, pcluster, secondary_startup);
44 arch_send_wakeup_ipi_mask(cpumask_of(cpu));
45 dsb_sev();
46 return 0;
47}
48
49static void mcpm_secondary_init(unsigned int cpu)
50{
51 mcpm_cpu_powered_up();
52}
53
54#ifdef CONFIG_HOTPLUG_CPU
55
56static int mcpm_cpu_kill(unsigned int cpu)
57{
58 unsigned int pcpu, pcluster;
59
60 cpu_to_pcpu(cpu, &pcpu, &pcluster);
61
62 return !mcpm_wait_for_cpu_powerdown(pcpu, pcluster);
63}
64
65static bool mcpm_cpu_can_disable(unsigned int cpu)
66{
67 /* We assume all CPUs may be shut down. */
68 return true;
69}
70
71static void mcpm_cpu_die(unsigned int cpu)
72{
73 unsigned int mpidr, pcpu, pcluster;
74 mpidr = read_cpuid_mpidr();
75 pcpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
76 pcluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
77 mcpm_set_entry_vector(pcpu, pcluster, NULL);
78 mcpm_cpu_power_down();
79}
80
81#endif
82
83static const struct smp_operations mcpm_smp_ops __initconst = {
84 .smp_boot_secondary = mcpm_boot_secondary,
85 .smp_secondary_init = mcpm_secondary_init,
86#ifdef CONFIG_HOTPLUG_CPU
87 .cpu_kill = mcpm_cpu_kill,
88 .cpu_can_disable = mcpm_cpu_can_disable,
89 .cpu_die = mcpm_cpu_die,
90#endif
91};
92
93void __init mcpm_smp_set_ops(void)
94{
95 smp_set_ops(&mcpm_smp_ops);
96}
1/*
2 * linux/arch/arm/mach-vexpress/mcpm_platsmp.c
3 *
4 * Created by: Nicolas Pitre, November 2012
5 * Copyright: (C) 2012-2013 Linaro Limited
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 * Code to handle secondary CPU bringup and hotplug for the cluster power API.
12 */
13
14#include <linux/init.h>
15#include <linux/smp.h>
16#include <linux/spinlock.h>
17
18#include <asm/mcpm.h>
19#include <asm/smp.h>
20#include <asm/smp_plat.h>
21
22static void cpu_to_pcpu(unsigned int cpu,
23 unsigned int *pcpu, unsigned int *pcluster)
24{
25 unsigned int mpidr;
26
27 mpidr = cpu_logical_map(cpu);
28 *pcpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
29 *pcluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
30}
31
32static int mcpm_boot_secondary(unsigned int cpu, struct task_struct *idle)
33{
34 unsigned int pcpu, pcluster, ret;
35 extern void secondary_startup(void);
36
37 cpu_to_pcpu(cpu, &pcpu, &pcluster);
38
39 pr_debug("%s: logical CPU %d is physical CPU %d cluster %d\n",
40 __func__, cpu, pcpu, pcluster);
41
42 mcpm_set_entry_vector(pcpu, pcluster, NULL);
43 ret = mcpm_cpu_power_up(pcpu, pcluster);
44 if (ret)
45 return ret;
46 mcpm_set_entry_vector(pcpu, pcluster, secondary_startup);
47 arch_send_wakeup_ipi_mask(cpumask_of(cpu));
48 dsb_sev();
49 return 0;
50}
51
52static void mcpm_secondary_init(unsigned int cpu)
53{
54 mcpm_cpu_powered_up();
55}
56
57#ifdef CONFIG_HOTPLUG_CPU
58
59static int mcpm_cpu_kill(unsigned int cpu)
60{
61 unsigned int pcpu, pcluster;
62
63 cpu_to_pcpu(cpu, &pcpu, &pcluster);
64
65 return !mcpm_cpu_power_down_finish(pcpu, pcluster);
66}
67
68static int mcpm_cpu_disable(unsigned int cpu)
69{
70 /*
71 * We assume all CPUs may be shut down.
72 * This would be the hook to use for eventual Secure
73 * OS migration requests as described in the PSCI spec.
74 */
75 return 0;
76}
77
78static void mcpm_cpu_die(unsigned int cpu)
79{
80 unsigned int mpidr, pcpu, pcluster;
81 mpidr = read_cpuid_mpidr();
82 pcpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
83 pcluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
84 mcpm_set_entry_vector(pcpu, pcluster, NULL);
85 mcpm_cpu_power_down();
86}
87
88#endif
89
90static struct smp_operations __initdata mcpm_smp_ops = {
91 .smp_boot_secondary = mcpm_boot_secondary,
92 .smp_secondary_init = mcpm_secondary_init,
93#ifdef CONFIG_HOTPLUG_CPU
94 .cpu_kill = mcpm_cpu_kill,
95 .cpu_disable = mcpm_cpu_disable,
96 .cpu_die = mcpm_cpu_die,
97#endif
98};
99
100void __init mcpm_smp_set_ops(void)
101{
102 smp_set_ops(&mcpm_smp_ops);
103}