linux-libre/arch/arm/mach-alpine/platsmp.c

/*
 * SMP operations for Alpine platform.
 *
 * Copyright (C) 2015 Annapurna Labs Ltd.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/init.h>
#include <linux/errno.h>
#include <linux/io.h>
#include <linux/of.h>

#include <asm/smp_plat.h>

#include "alpine_cpu_pm.h"

static int alpine_boot_secondary(unsigned int cpu, struct task_struct *idle)
{
	phys_addr_t addr;

	addr = virt_to_phys(secondary_startup);

	if (addr > (phys_addr_t)(uint32_t)(-1)) {
		pr_err("FAIL: resume address over 32bit (%pa)", &addr);
		return -EINVAL;
	}

	return alpine_cpu_wakeup(cpu_logical_map(cpu), (uint32_t)addr);
}

static void __init alpine_smp_prepare_cpus(unsigned int max_cpus)
{
	alpine_cpu_pm_init();
}

static const struct smp_operations alpine_smp_ops __initconst = {
	.smp_prepare_cpus	= alpine_smp_prepare_cpus,
	.smp_boot_secondary	= alpine_boot_secondary,
};
CPU_METHOD_OF_DECLARE(alpine_smp, "al,alpine-smp", &alpine_smp_ops);