1/*
2 * SMP support for R-Mobile / SH-Mobile - r8a7779 portion
3 *
4 * Copyright (C) 2011  Renesas Solutions Corp.
5 * Copyright (C) 2011  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/spinlock.h>
20#include <linux/io.h>
21#include <linux/delay.h>
22
23#include <asm/cacheflush.h>
24#include <asm/smp_plat.h>
25#include <asm/smp_scu.h>
26
27#include "common.h"
28#include "pm-rcar.h"
29#include "r8a7779.h"
30
31#define AVECR IOMEM(0xfe700040)
32#define R8A7779_SCU_BASE 0xf0000000
33
34static const struct rcar_sysc_ch r8a7779_ch_cpu1 = {
35	.chan_offs = 0x40, /* PWRSR0 .. PWRER0 */
36	.chan_bit = 1, /* ARM1 */
37	.isr_bit = 1, /* ARM1 */
38};
39
40static const struct rcar_sysc_ch r8a7779_ch_cpu2 = {
41	.chan_offs = 0x40, /* PWRSR0 .. PWRER0 */
42	.chan_bit = 2, /* ARM2 */
43	.isr_bit = 2, /* ARM2 */
44};
45
46static const struct rcar_sysc_ch r8a7779_ch_cpu3 = {
47	.chan_offs = 0x40, /* PWRSR0 .. PWRER0 */
48	.chan_bit = 3, /* ARM3 */
49	.isr_bit = 3, /* ARM3 */
50};
51
52static const struct rcar_sysc_ch * const r8a7779_ch_cpu[4] = {
53	[1] = &r8a7779_ch_cpu1,
54	[2] = &r8a7779_ch_cpu2,
55	[3] = &r8a7779_ch_cpu3,
56};
57
58static int r8a7779_platform_cpu_kill(unsigned int cpu)
59{
60	const struct rcar_sysc_ch *ch = NULL;
61	int ret = -EIO;
62
63	cpu = cpu_logical_map(cpu);
64
65	if (cpu < ARRAY_SIZE(r8a7779_ch_cpu))
66		ch = r8a7779_ch_cpu[cpu];
67
68	if (ch)
69		ret = rcar_sysc_power_down(ch);
70
71	return ret ? ret : 1;
72}
73
74static int r8a7779_boot_secondary(unsigned int cpu, struct task_struct *idle)
75{
76	const struct rcar_sysc_ch *ch = NULL;
77	unsigned int lcpu = cpu_logical_map(cpu);
78	int ret;
79
80	if (lcpu < ARRAY_SIZE(r8a7779_ch_cpu))
81		ch = r8a7779_ch_cpu[lcpu];
82
83	if (ch)
84		ret = rcar_sysc_power_up(ch);
85	else
86		ret = -EIO;
87
88	return ret;
89}
90
91static void __init r8a7779_smp_prepare_cpus(unsigned int max_cpus)
92{
93	/* Map the reset vector (in headsmp-scu.S, headsmp.S) */
94	__raw_writel(__pa(shmobile_boot_vector), AVECR);
95	shmobile_boot_fn = virt_to_phys(shmobile_boot_scu);
96	shmobile_boot_arg = (unsigned long)shmobile_scu_base;
97
98	/* setup r8a7779 specific SCU bits */
99	shmobile_scu_base = IOMEM(R8A7779_SCU_BASE);
100	shmobile_smp_scu_prepare_cpus(max_cpus);
101
102	r8a7779_pm_init();
103
104	/* power off secondary CPUs */
105	r8a7779_platform_cpu_kill(1);
106	r8a7779_platform_cpu_kill(2);
107	r8a7779_platform_cpu_kill(3);
108}
109
110#ifdef CONFIG_HOTPLUG_CPU
111static int r8a7779_cpu_kill(unsigned int cpu)
112{
113	if (shmobile_smp_scu_cpu_kill(cpu))
114		return r8a7779_platform_cpu_kill(cpu);
115
116	return 0;
117}
118#endif /* CONFIG_HOTPLUG_CPU */
119
120struct smp_operations r8a7779_smp_ops  __initdata = {
121	.smp_prepare_cpus	= r8a7779_smp_prepare_cpus,
122	.smp_boot_secondary	= r8a7779_boot_secondary,
123#ifdef CONFIG_HOTPLUG_CPU
124	.cpu_die		= shmobile_smp_scu_cpu_die,
125	.cpu_kill		= r8a7779_cpu_kill,
126#endif
127};
128