83 lines
2.2 KiB
C
83 lines
2.2 KiB
C
/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* Copyright (C) 2012 ARM Limited
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*
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* Author: Will Deacon <will.deacon@arm.com>
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*/
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#include <linux/init.h>
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#include <linux/smp.h>
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#include <linux/of.h>
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#include <asm/psci.h>
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#include <asm/smp_plat.h>
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/*
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* psci_smp assumes that the following is true about PSCI:
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*
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* cpu_suspend Suspend the execution on a CPU
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* @state we don't currently describe affinity levels, so just pass 0.
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* @entry_point the first instruction to be executed on return
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* returns 0 success, < 0 on failure
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*
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* cpu_off Power down a CPU
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* @state we don't currently describe affinity levels, so just pass 0.
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* no return on successful call
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*
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* cpu_on Power up a CPU
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* @cpuid cpuid of target CPU, as from MPIDR
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* @entry_point the first instruction to be executed on return
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* returns 0 success, < 0 on failure
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*
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* migrate Migrate the context to a different CPU
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* @cpuid cpuid of target CPU, as from MPIDR
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* returns 0 success, < 0 on failure
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*
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*/
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extern void secondary_startup(void);
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static int psci_boot_secondary(unsigned int cpu, struct task_struct *idle)
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{
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if (psci_ops.cpu_on)
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return psci_ops.cpu_on(cpu_logical_map(cpu),
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__pa(secondary_startup));
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return -ENODEV;
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}
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#ifdef CONFIG_HOTPLUG_CPU
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void __ref psci_cpu_die(unsigned int cpu)
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{
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const struct psci_power_state ps = {
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.type = PSCI_POWER_STATE_TYPE_POWER_DOWN,
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};
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if (psci_ops.cpu_off)
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psci_ops.cpu_off(ps);
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/* We should never return */
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panic("psci: cpu %d failed to shutdown\n", cpu);
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}
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#endif
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bool __init psci_smp_available(void)
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{
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/* is cpu_on available at least? */
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return (psci_ops.cpu_on != NULL);
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}
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struct smp_operations __initdata psci_smp_ops = {
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.smp_boot_secondary = psci_boot_secondary,
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#ifdef CONFIG_HOTPLUG_CPU
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.cpu_die = psci_cpu_die,
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#endif
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};
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