diff options
Diffstat (limited to 'arch/arm/kernel/psci_smp.c')
-rw-r--r-- | arch/arm/kernel/psci_smp.c | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/arch/arm/kernel/psci_smp.c b/arch/arm/kernel/psci_smp.c new file mode 100644 index 000000000000..219f1d73572a --- /dev/null +++ b/arch/arm/kernel/psci_smp.c | |||
@@ -0,0 +1,84 @@ | |||
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 | |||
49 | static int __cpuinit psci_boot_secondary(unsigned int cpu, | ||
50 | struct task_struct *idle) | ||
51 | { | ||
52 | if (psci_ops.cpu_on) | ||
53 | return psci_ops.cpu_on(cpu_logical_map(cpu), | ||
54 | __pa(secondary_startup)); | ||
55 | return -ENODEV; | ||
56 | } | ||
57 | |||
58 | #ifdef CONFIG_HOTPLUG_CPU | ||
59 | void __ref psci_cpu_die(unsigned int cpu) | ||
60 | { | ||
61 | const struct psci_power_state ps = { | ||
62 | .type = PSCI_POWER_STATE_TYPE_POWER_DOWN, | ||
63 | }; | ||
64 | |||
65 | if (psci_ops.cpu_off) | ||
66 | psci_ops.cpu_off(ps); | ||
67 | |||
68 | /* We should never return */ | ||
69 | panic("psci: cpu %d failed to shutdown\n", cpu); | ||
70 | } | ||
71 | #endif | ||
72 | |||
73 | bool __init psci_smp_available(void) | ||
74 | { | ||
75 | /* is cpu_on available at least? */ | ||
76 | return (psci_ops.cpu_on != NULL); | ||
77 | } | ||
78 | |||
79 | struct smp_operations __initdata psci_smp_ops = { | ||
80 | .smp_boot_secondary = psci_boot_secondary, | ||
81 | #ifdef CONFIG_HOTPLUG_CPU | ||
82 | .cpu_die = psci_cpu_die, | ||
83 | #endif | ||
84 | }; | ||