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.
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.
11 * Copyright (C) 2012 ARM Limited
13 * Author: Will Deacon <will.deacon@arm.com>
16 #include <linux/init.h>
17 #include <linux/irqchip/arm-gic.h>
18 #include <linux/smp.h>
22 #include <asm/smp_plat.h>
25 * psci_smp assumes that the following is true about PSCI:
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
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
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
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
47 extern void secondary_startup(void);
49 static int psci_boot_secondary(unsigned int cpu
, struct task_struct
*idle
)
52 return psci_ops
.cpu_on(cpu_logical_map(cpu
),
53 __pa(secondary_startup
));
57 #ifdef CONFIG_HOTPLUG_CPU
58 void __ref
psci_cpu_die(unsigned int cpu
)
60 const struct psci_power_state ps
= {
61 .type
= PSCI_POWER_STATE_TYPE_POWER_DOWN
,
67 /* We should never return */
68 panic("psci: cpu %d failed to shutdown\n", cpu
);
72 bool __init
psci_smp_available(void)
74 /* is cpu_on available at least? */
75 return (psci_ops
.cpu_on
!= NULL
);
78 struct smp_operations __initdata psci_smp_ops
= {
79 .smp_boot_secondary
= psci_boot_secondary
,
80 #ifdef CONFIG_HOTPLUG_CPU
81 .cpu_die
= psci_cpu_die
,