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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> | |
17 | #include <linux/irqchip/arm-gic.h> | |
18 | #include <linux/smp.h> | |
19 | #include <linux/of.h> | |
20 | ||
21 | #include <asm/psci.h> | |
22 | #include <asm/smp_plat.h> | |
23 | ||
24 | /* | |
25 | * psci_smp assumes that the following is true about PSCI: | |
26 | * | |
27 | * cpu_suspend Suspend the execution on a CPU | |
28 | * @state we don't currently describe affinity levels, so just pass 0. | |
29 | * @entry_point the first instruction to be executed on return | |
30 | * returns 0 success, < 0 on failure | |
31 | * | |
32 | * cpu_off Power down a CPU | |
33 | * @state we don't currently describe affinity levels, so just pass 0. | |
34 | * no return on successful call | |
35 | * | |
36 | * cpu_on Power up a CPU | |
37 | * @cpuid cpuid of target CPU, as from MPIDR | |
38 | * @entry_point the first instruction to be executed on return | |
39 | * returns 0 success, < 0 on failure | |
40 | * | |
41 | * migrate Migrate the context to a different CPU | |
42 | * @cpuid cpuid of target CPU, as from MPIDR | |
43 | * returns 0 success, < 0 on failure | |
44 | * | |
45 | */ | |
46 | ||
47 | extern void secondary_startup(void); | |
48 | ||
8bd26e3a | 49 | static int psci_boot_secondary(unsigned int cpu, struct task_struct *idle) |
05774088 SS |
50 | { |
51 | if (psci_ops.cpu_on) | |
52 | return psci_ops.cpu_on(cpu_logical_map(cpu), | |
53 | __pa(secondary_startup)); | |
54 | return -ENODEV; | |
55 | } | |
56 | ||
57 | #ifdef CONFIG_HOTPLUG_CPU | |
58 | void __ref psci_cpu_die(unsigned int cpu) | |
59 | { | |
60 | const struct psci_power_state ps = { | |
61 | .type = PSCI_POWER_STATE_TYPE_POWER_DOWN, | |
62 | }; | |
63 | ||
64 | if (psci_ops.cpu_off) | |
65 | psci_ops.cpu_off(ps); | |
66 | ||
67 | /* We should never return */ | |
68 | panic("psci: cpu %d failed to shutdown\n", cpu); | |
69 | } | |
05774088 SS |
70 | #endif |
71 | ||
72 | bool __init psci_smp_available(void) | |
73 | { | |
74 | /* is cpu_on available at least? */ | |
75 | return (psci_ops.cpu_on != NULL); | |
76 | } | |
77 | ||
78 | struct smp_operations __initdata psci_smp_ops = { | |
79 | .smp_boot_secondary = psci_boot_secondary, | |
fdeb94b5 | 80 | #ifdef CONFIG_HOTPLUG_CPU |
05774088 | 81 | .cpu_die = psci_cpu_die, |
fdeb94b5 | 82 | #endif |
05774088 | 83 | }; |