1// SPDX-License-Identifier: GPL-2.0
2/*
3 * SMP support for R-Mobile / SH-Mobile - r8a7779 portion
4 *
5 * Copyright (C) 2011  Renesas Solutions Corp.
6 * Copyright (C) 2011  Magnus Damm
7 */
8#include <linux/kernel.h>
9#include <linux/init.h>
10#include <linux/smp.h>
11#include <linux/spinlock.h>
12#include <linux/io.h>
13#include <linux/delay.h>
14#include <linux/soc/renesas/rcar-sysc.h>
15
16#include <asm/cacheflush.h>
17#include <asm/smp_plat.h>
18#include <asm/smp_scu.h>
19
20#include "common.h"
21#include "r8a7779.h"
22
23#define AVECR IOMEM(0xfe700040)
24#define R8A7779_SCU_BASE 0xf0000000
25
26static int r8a7779_boot_secondary(unsigned int cpu, struct task_struct *idle)
27{
28	int ret = -EIO;
29
30	cpu = cpu_logical_map(cpu);
31	if (cpu)
32		ret = rcar_sysc_power_up_cpu(cpu);
33
34	return ret;
35}
36
37static void __init r8a7779_smp_prepare_cpus(unsigned int max_cpus)
38{
39	/* Map the reset vector (in headsmp-scu.S, headsmp.S) */
40	__raw_writel(__pa(shmobile_boot_vector), AVECR);
41
42	/* setup r8a7779 specific SCU bits */
43	shmobile_smp_scu_prepare_cpus(R8A7779_SCU_BASE, max_cpus);
44}
45
46#ifdef CONFIG_HOTPLUG_CPU
47static int r8a7779_platform_cpu_kill(unsigned int cpu)
48{
49	int ret = -EIO;
50
51	cpu = cpu_logical_map(cpu);
52	if (cpu)
53		ret = rcar_sysc_power_down_cpu(cpu);
54
55	return ret ? ret : 1;
56}
57
58static int r8a7779_cpu_kill(unsigned int cpu)
59{
60	if (shmobile_smp_scu_cpu_kill(cpu))
61		return r8a7779_platform_cpu_kill(cpu);
62
63	return 0;
64}
65#endif /* CONFIG_HOTPLUG_CPU */
66
67const struct smp_operations r8a7779_smp_ops  __initconst = {
68	.smp_prepare_cpus	= r8a7779_smp_prepare_cpus,
69	.smp_boot_secondary	= r8a7779_boot_secondary,
70#ifdef CONFIG_HOTPLUG_CPU
71	.cpu_die		= shmobile_smp_scu_cpu_die,
72	.cpu_kill		= r8a7779_cpu_kill,
73#endif
74};
75