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9ff221ba NP |
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 | ||
9ff221ba NP |
18 | #include <asm/mcpm.h> |
19 | #include <asm/smp.h> | |
20 | #include <asm/smp_plat.h> | |
21 | ||
1e566099 DM |
22 | static 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 | ||
8bd26e3a | 32 | static int mcpm_boot_secondary(unsigned int cpu, struct task_struct *idle) |
9ff221ba | 33 | { |
1e566099 | 34 | unsigned int pcpu, pcluster, ret; |
9ff221ba NP |
35 | extern void secondary_startup(void); |
36 | ||
1e566099 DM |
37 | cpu_to_pcpu(cpu, &pcpu, &pcluster); |
38 | ||
9ff221ba NP |
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 | ||
8bd26e3a | 52 | static void mcpm_secondary_init(unsigned int cpu) |
9ff221ba NP |
53 | { |
54 | mcpm_cpu_powered_up(); | |
9ff221ba NP |
55 | } |
56 | ||
57 | #ifdef CONFIG_HOTPLUG_CPU | |
58 | ||
0de0d646 DM |
59 | static int mcpm_cpu_kill(unsigned int cpu) |
60 | { | |
61 | unsigned int pcpu, pcluster; | |
62 | ||
63 | cpu_to_pcpu(cpu, &pcpu, &pcluster); | |
64 | ||
166aaf39 | 65 | return !mcpm_wait_for_cpu_powerdown(pcpu, pcluster); |
0de0d646 DM |
66 | } |
67 | ||
9ff221ba NP |
68 | static 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 | ||
78 | static 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 | ||
a7eb7c6f | 90 | static struct smp_operations __initdata mcpm_smp_ops = { |
9ff221ba NP |
91 | .smp_boot_secondary = mcpm_boot_secondary, |
92 | .smp_secondary_init = mcpm_secondary_init, | |
93 | #ifdef CONFIG_HOTPLUG_CPU | |
0de0d646 | 94 | .cpu_kill = mcpm_cpu_kill, |
9ff221ba NP |
95 | .cpu_disable = mcpm_cpu_disable, |
96 | .cpu_die = mcpm_cpu_die, | |
97 | #endif | |
98 | }; | |
a7eb7c6f NP |
99 | |
100 | void __init mcpm_smp_set_ops(void) | |
101 | { | |
102 | smp_set_ops(&mcpm_smp_ops); | |
103 | } |