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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 <linux/irqchip/arm-gic.h> | |
19 | ||
20 | #include <asm/mcpm.h> | |
21 | #include <asm/smp.h> | |
22 | #include <asm/smp_plat.h> | |
23 | ||
24 | static void __init simple_smp_init_cpus(void) | |
25 | { | |
26 | } | |
27 | ||
28 | static int __cpuinit mcpm_boot_secondary(unsigned int cpu, struct task_struct *idle) | |
29 | { | |
30 | unsigned int mpidr, pcpu, pcluster, ret; | |
31 | extern void secondary_startup(void); | |
32 | ||
33 | mpidr = cpu_logical_map(cpu); | |
34 | pcpu = MPIDR_AFFINITY_LEVEL(mpidr, 0); | |
35 | pcluster = MPIDR_AFFINITY_LEVEL(mpidr, 1); | |
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 | ||
49 | static void __cpuinit mcpm_secondary_init(unsigned int cpu) | |
50 | { | |
51 | mcpm_cpu_powered_up(); | |
52 | gic_secondary_init(0); | |
53 | } | |
54 | ||
55 | #ifdef CONFIG_HOTPLUG_CPU | |
56 | ||
57 | static int mcpm_cpu_disable(unsigned int cpu) | |
58 | { | |
59 | /* | |
60 | * We assume all CPUs may be shut down. | |
61 | * This would be the hook to use for eventual Secure | |
62 | * OS migration requests as described in the PSCI spec. | |
63 | */ | |
64 | return 0; | |
65 | } | |
66 | ||
67 | static void mcpm_cpu_die(unsigned int cpu) | |
68 | { | |
69 | unsigned int mpidr, pcpu, pcluster; | |
70 | mpidr = read_cpuid_mpidr(); | |
71 | pcpu = MPIDR_AFFINITY_LEVEL(mpidr, 0); | |
72 | pcluster = MPIDR_AFFINITY_LEVEL(mpidr, 1); | |
73 | mcpm_set_entry_vector(pcpu, pcluster, NULL); | |
74 | mcpm_cpu_power_down(); | |
75 | } | |
76 | ||
77 | #endif | |
78 | ||
79 | struct smp_operations __initdata mcpm_smp_ops = { | |
80 | .smp_init_cpus = simple_smp_init_cpus, | |
81 | .smp_boot_secondary = mcpm_boot_secondary, | |
82 | .smp_secondary_init = mcpm_secondary_init, | |
83 | #ifdef CONFIG_HOTPLUG_CPU | |
84 | .cpu_disable = mcpm_cpu_disable, | |
85 | .cpu_die = mcpm_cpu_die, | |
86 | #endif | |
87 | }; |