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#include <asm/smp_twd.h>
27
28#include "common.h"
29#include "pm-rcar.h"
30#include "r8a7779.h"
31
32#define AVECR IOMEM(0xfe700040)
33#define R8A7779_SCU_BASE 0xf0000000
34
35static struct rcar_sysc_ch r8a7779_ch_cpu1 = {
36	.chan_offs = 0x40, /* PWRSR0 .. PWRER0 */
37	.chan_bit = 1, /* ARM1 */
38	.isr_bit = 1, /* ARM1 */
39};
40
41static struct rcar_sysc_ch r8a7779_ch_cpu2 = {
42	.chan_offs = 0x40, /* PWRSR0 .. PWRER0 */
43	.chan_bit = 2, /* ARM2 */
44	.isr_bit = 2, /* ARM2 */
45};
46
47static struct rcar_sysc_ch r8a7779_ch_cpu3 = {
48	.chan_offs = 0x40, /* PWRSR0 .. PWRER0 */
49	.chan_bit = 3, /* ARM3 */
50	.isr_bit = 3, /* ARM3 */
51};
52
53static struct rcar_sysc_ch *r8a7779_ch_cpu[4] = {
54	[1] = &r8a7779_ch_cpu1,
55	[2] = &r8a7779_ch_cpu2,
56	[3] = &r8a7779_ch_cpu3,
57};
58
59#if defined(CONFIG_HAVE_ARM_TWD) && !defined(CONFIG_ARCH_MULTIPLATFORM)
60static DEFINE_TWD_LOCAL_TIMER(twd_local_timer, R8A7779_SCU_BASE + 0x600, 29);
61void __init r8a7779_register_twd(void)
62{
63	twd_local_timer_register(&twd_local_timer);
64}
65#endif
66
67static int r8a7779_platform_cpu_kill(unsigned int cpu)
68{
69	struct rcar_sysc_ch *ch = NULL;
70	int ret = -EIO;
71
72	cpu = cpu_logical_map(cpu);
73
74	if (cpu < ARRAY_SIZE(r8a7779_ch_cpu))
75		ch = r8a7779_ch_cpu[cpu];
76
77	if (ch)
78		ret = rcar_sysc_power_down(ch);
79
80	return ret ? ret : 1;
81}
82
83static int r8a7779_boot_secondary(unsigned int cpu, struct task_struct *idle)
84{
85	struct rcar_sysc_ch *ch = NULL;
86	unsigned int lcpu = cpu_logical_map(cpu);
87	int ret;
88
89	if (lcpu < ARRAY_SIZE(r8a7779_ch_cpu))
90		ch = r8a7779_ch_cpu[lcpu];
91
92	if (ch)
93		ret = rcar_sysc_power_up(ch);
94	else
95		ret = -EIO;
96
97	return ret;
98}
99
100static void __init r8a7779_smp_prepare_cpus(unsigned int max_cpus)
101{
102	/* Map the reset vector (in headsmp-scu.S, headsmp.S) */
103	__raw_writel(__pa(shmobile_boot_vector), AVECR);
104	shmobile_boot_fn = virt_to_phys(shmobile_boot_scu);
105	shmobile_boot_arg = (unsigned long)shmobile_scu_base;
106
107	/* setup r8a7779 specific SCU bits */
108	shmobile_scu_base = IOMEM(R8A7779_SCU_BASE);
109	shmobile_smp_scu_prepare_cpus(max_cpus);
110
111	r8a7779_pm_init();
112
113	/* power off secondary CPUs */
114	r8a7779_platform_cpu_kill(1);
115	r8a7779_platform_cpu_kill(2);
116	r8a7779_platform_cpu_kill(3);
117}
118
119#ifdef CONFIG_HOTPLUG_CPU
120static int r8a7779_cpu_kill(unsigned int cpu)
121{
122	if (shmobile_smp_scu_cpu_kill(cpu))
123		return r8a7779_platform_cpu_kill(cpu);
124
125	return 0;
126}
127#endif /* CONFIG_HOTPLUG_CPU */
128
129struct smp_operations r8a7779_smp_ops  __initdata = {
130	.smp_prepare_cpus	= r8a7779_smp_prepare_cpus,
131	.smp_boot_secondary	= r8a7779_boot_secondary,
132#ifdef CONFIG_HOTPLUG_CPU
133	.cpu_die		= shmobile_smp_scu_cpu_die,
134	.cpu_kill		= r8a7779_cpu_kill,
135#endif
136};
137