1/*
2 * SMP support for r8a7791
3 *
4 * Copyright (C) 2013 Renesas Solutions Corp.
5 * Copyright (C) 2013 Magnus Damm
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; version 2 of the License.
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#include <linux/kernel.h>
17#include <linux/init.h>
18#include <linux/smp.h>
19#include <linux/io.h>
20
21#include <asm/smp_plat.h>
22
23#include "common.h"
24#include "platsmp-apmu.h"
25#include "r8a7791.h"
26#include "rcar-gen2.h"
27
28static struct rcar_apmu_config r8a7791_apmu_config[] = {
29	{
30		.iomem = DEFINE_RES_MEM(0xe6152000, 0x188),
31		.cpus = { 0, 1 },
32	}
33};
34
35static void __init r8a7791_smp_prepare_cpus(unsigned int max_cpus)
36{
37	/* let APMU code install data related to shmobile_boot_vector */
38	shmobile_smp_apmu_prepare_cpus(max_cpus,
39				       r8a7791_apmu_config,
40				       ARRAY_SIZE(r8a7791_apmu_config));
41
42	rcar_gen2_pm_init();
43}
44
45static int r8a7791_smp_boot_secondary(unsigned int cpu,
46				      struct task_struct *idle)
47{
48	/* Error out when hardware debug mode is enabled */
49	if (rcar_gen2_read_mode_pins() & BIT(21)) {
50		pr_warn("Unable to boot CPU%u when MD21 is set\n", cpu);
51		return -ENOTSUPP;
52	}
53
54	return shmobile_smp_apmu_boot_secondary(cpu, idle);
55}
56
57struct smp_operations r8a7791_smp_ops __initdata = {
58	.smp_prepare_cpus	= r8a7791_smp_prepare_cpus,
59	.smp_boot_secondary	= r8a7791_smp_boot_secondary,
60#ifdef CONFIG_HOTPLUG_CPU
61	.cpu_can_disable	= shmobile_smp_cpu_can_disable,
62	.cpu_die		= shmobile_smp_apmu_cpu_die,
63	.cpu_kill		= shmobile_smp_apmu_cpu_kill,
64#endif
65};
66