1/*
2 * SMP operations for Alpine platform.
3 *
4 * Copyright (C) 2015 Annapurna Labs Ltd.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14 * GNU General Public License for more details.
15 */
16
17#include <linux/init.h>
18#include <linux/errno.h>
19#include <linux/io.h>
20#include <linux/of.h>
21
22#include <asm/smp_plat.h>
23
24#include "alpine_cpu_pm.h"
25
26static int alpine_boot_secondary(unsigned int cpu, struct task_struct *idle)
27{
28	phys_addr_t addr;
29
30	addr = virt_to_phys(secondary_startup);
31
32	if (addr > (phys_addr_t)(uint32_t)(-1)) {
33		pr_err("FAIL: resume address over 32bit (%pa)", &addr);
34		return -EINVAL;
35	}
36
37	return alpine_cpu_wakeup(cpu_logical_map(cpu), (uint32_t)addr);
38}
39
40static void __init alpine_smp_prepare_cpus(unsigned int max_cpus)
41{
42	alpine_cpu_pm_init();
43}
44
45static struct smp_operations alpine_smp_ops __initdata = {
46	.smp_prepare_cpus	= alpine_smp_prepare_cpus,
47	.smp_boot_secondary	= alpine_boot_secondary,
48};
49CPU_METHOD_OF_DECLARE(alpine_smp, "al,alpine-smp", &alpine_smp_ops);
50