https://github.com/torvalds/linux
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Tip revision: ae83d0b416db002fe95601e7f97f64b59514d936 authored by Linus Torvalds on 19 April 2020, 21:35:30 UTC
Linux 5.7-rc2
Tip revision: ae83d0b
hotplug.c
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * CPU hotplug support for CSR Marco dual-core SMP SoCs
 *
 * Copyright (c) 2012 Cambridge Silicon Radio Limited, a CSR plc group company.
 */

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/smp.h>

#include <asm/smp_plat.h>
#include "common.h"

static inline void platform_do_lowpower(unsigned int cpu)
{
	/* we put the platform to just WFI */
	for (;;) {
		__asm__ __volatile__("dsb\n\t" "wfi\n\t"
			: : : "memory");
		if (prima2_pen_release == cpu_logical_map(cpu)) {
			/*
			 * OK, proper wakeup, we're done
			 */
			break;
		}
	}
}

/*
 * platform-specific code to shutdown a CPU
 *
 * Called with IRQs disabled
 */
void sirfsoc_cpu_die(unsigned int cpu)
{
	platform_do_lowpower(cpu);
}
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