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05774088 SS |
1 | /* |
2 | * This program is free software; you can redistribute it and/or modify | |
3 | * it under the terms of the GNU General Public License version 2 as | |
4 | * published by the Free Software Foundation. | |
5 | * | |
6 | * This program is distributed in the hope that it will be useful, | |
7 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
8 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
9 | * GNU General Public License for more details. | |
10 | * | |
11 | * Copyright (C) 2012 ARM Limited | |
12 | * | |
13 | * Author: Will Deacon <will.deacon@arm.com> | |
14 | */ | |
15 | ||
16 | #include <linux/init.h> | |
05774088 SS |
17 | #include <linux/smp.h> |
18 | #include <linux/of.h> | |
19 | ||
20 | #include <asm/psci.h> | |
21 | #include <asm/smp_plat.h> | |
22 | ||
23 | /* | |
24 | * psci_smp assumes that the following is true about PSCI: | |
25 | * | |
26 | * cpu_suspend Suspend the execution on a CPU | |
27 | * @state we don't currently describe affinity levels, so just pass 0. | |
28 | * @entry_point the first instruction to be executed on return | |
29 | * returns 0 success, < 0 on failure | |
30 | * | |
31 | * cpu_off Power down a CPU | |
32 | * @state we don't currently describe affinity levels, so just pass 0. | |
33 | * no return on successful call | |
34 | * | |
35 | * cpu_on Power up a CPU | |
36 | * @cpuid cpuid of target CPU, as from MPIDR | |
37 | * @entry_point the first instruction to be executed on return | |
38 | * returns 0 success, < 0 on failure | |
39 | * | |
40 | * migrate Migrate the context to a different CPU | |
41 | * @cpuid cpuid of target CPU, as from MPIDR | |
42 | * returns 0 success, < 0 on failure | |
43 | * | |
44 | */ | |
45 | ||
46 | extern void secondary_startup(void); | |
47 | ||
8bd26e3a | 48 | static int psci_boot_secondary(unsigned int cpu, struct task_struct *idle) |
05774088 SS |
49 | { |
50 | if (psci_ops.cpu_on) | |
51 | return psci_ops.cpu_on(cpu_logical_map(cpu), | |
52 | __pa(secondary_startup)); | |
53 | return -ENODEV; | |
54 | } | |
55 | ||
56 | #ifdef CONFIG_HOTPLUG_CPU | |
57 | void __ref psci_cpu_die(unsigned int cpu) | |
58 | { | |
59 | const struct psci_power_state ps = { | |
60 | .type = PSCI_POWER_STATE_TYPE_POWER_DOWN, | |
61 | }; | |
62 | ||
63 | if (psci_ops.cpu_off) | |
64 | psci_ops.cpu_off(ps); | |
65 | ||
66 | /* We should never return */ | |
67 | panic("psci: cpu %d failed to shutdown\n", cpu); | |
68 | } | |
05774088 SS |
69 | #endif |
70 | ||
71 | bool __init psci_smp_available(void) | |
72 | { | |
73 | /* is cpu_on available at least? */ | |
74 | return (psci_ops.cpu_on != NULL); | |
75 | } | |
76 | ||
77 | struct smp_operations __initdata psci_smp_ops = { | |
78 | .smp_boot_secondary = psci_boot_secondary, | |
fdeb94b5 | 79 | #ifdef CONFIG_HOTPLUG_CPU |
05774088 | 80 | .cpu_die = psci_cpu_die, |
fdeb94b5 | 81 | #endif |
05774088 | 82 | }; |