platsmp.c

 1// SPDX-License-Identifier: GPL-2.0-or-later
 2/*
 3 * SMP operations for Alpine platform.
 4 *
 5 * Copyright (C) 2015 Annapurna Labs Ltd.
 6 */
 7
 8#include <linux/init.h>
 9#include <linux/errno.h>
10#include <linux/io.h>
11#include <linux/of.h>
12
13#include <asm/smp_plat.h>
14
15#include "alpine_cpu_pm.h"
16
17static int alpine_boot_secondary(unsigned int cpu, struct task_struct *idle)
18{
19	phys_addr_t addr;
20
21	addr = __pa_symbol(secondary_startup);
22
23	if (addr > (phys_addr_t)(uint32_t)(-1)) {
24		pr_err("FAIL: resume address over 32bit (%pa)", &addr);
25		return -EINVAL;
26	}
27
28	return alpine_cpu_wakeup(cpu_logical_map(cpu), (uint32_t)addr);
29}
30
31static void __init alpine_smp_prepare_cpus(unsigned int max_cpus)
32{
33	alpine_cpu_pm_init();
34}
35
36static const struct smp_operations alpine_smp_ops __initconst = {
37	.smp_prepare_cpus	= alpine_smp_prepare_cpus,
38	.smp_boot_secondary	= alpine_boot_secondary,
39};
40CPU_METHOD_OF_DECLARE(alpine_smp, "al,alpine-smp", &alpine_smp_ops);