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 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
19 */
20#include <linux/kernel.h>
21#include <linux/init.h>
22#include <linux/smp.h>
23#include <linux/spinlock.h>
24#include <linux/io.h>
25#include <linux/delay.h>
26
27#include <asm/cacheflush.h>
28#include <asm/smp_plat.h>
29#include <asm/smp_scu.h>
30#include <asm/smp_twd.h>
31
32#include "common.h"
33#include "pm-rcar.h"
34#include "r8a7779.h"
35
36#define AVECR IOMEM(0xfe700040)
37#define R8A7779_SCU_BASE 0xf0000000
38
39static struct rcar_sysc_ch r8a7779_ch_cpu1 = {
40	.chan_offs = 0x40, /* PWRSR0 .. PWRER0 */
41	.chan_bit = 1, /* ARM1 */
42	.isr_bit = 1, /* ARM1 */
43};
44
45static struct rcar_sysc_ch r8a7779_ch_cpu2 = {
46	.chan_offs = 0x40, /* PWRSR0 .. PWRER0 */
47	.chan_bit = 2, /* ARM2 */
48	.isr_bit = 2, /* ARM2 */
49};
50
51static struct rcar_sysc_ch r8a7779_ch_cpu3 = {
52	.chan_offs = 0x40, /* PWRSR0 .. PWRER0 */
53	.chan_bit = 3, /* ARM3 */
54	.isr_bit = 3, /* ARM3 */
55};
56
57static struct rcar_sysc_ch *r8a7779_ch_cpu[4] = {
58	[1] = &r8a7779_ch_cpu1,
59	[2] = &r8a7779_ch_cpu2,
60	[3] = &r8a7779_ch_cpu3,
61};
62
63#ifdef CONFIG_HAVE_ARM_TWD
64static DEFINE_TWD_LOCAL_TIMER(twd_local_timer, R8A7779_SCU_BASE + 0x600, 29);
65void __init r8a7779_register_twd(void)
66{
67	twd_local_timer_register(&twd_local_timer);
68}
69#endif
70
71static int r8a7779_platform_cpu_kill(unsigned int cpu)
72{
73	struct rcar_sysc_ch *ch = NULL;
74	int ret = -EIO;
75
76	cpu = cpu_logical_map(cpu);
77
78	if (cpu < ARRAY_SIZE(r8a7779_ch_cpu))
79		ch = r8a7779_ch_cpu[cpu];
80
81	if (ch)
82		ret = rcar_sysc_power_down(ch);
83
84	return ret ? ret : 1;
85}
86
87static int r8a7779_boot_secondary(unsigned int cpu, struct task_struct *idle)
88{
89	struct rcar_sysc_ch *ch = NULL;
90	unsigned int lcpu = cpu_logical_map(cpu);
91	int ret;
92
93	if (lcpu < ARRAY_SIZE(r8a7779_ch_cpu))
94		ch = r8a7779_ch_cpu[lcpu];
95
96	if (ch)
97		ret = rcar_sysc_power_up(ch);
98	else
99		ret = -EIO;
100
101	return ret;
102}
103
104static void __init r8a7779_smp_prepare_cpus(unsigned int max_cpus)
105{
106	/* Map the reset vector (in headsmp-scu.S, headsmp.S) */
107	__raw_writel(__pa(shmobile_boot_vector), AVECR);
108	shmobile_boot_fn = virt_to_phys(shmobile_boot_scu);
109	shmobile_boot_arg = (unsigned long)shmobile_scu_base;
110
111	/* setup r8a7779 specific SCU bits */
112	shmobile_scu_base = IOMEM(R8A7779_SCU_BASE);
113	shmobile_smp_scu_prepare_cpus(max_cpus);
114
115	r8a7779_pm_init();
116
117	/* power off secondary CPUs */
118	r8a7779_platform_cpu_kill(1);
119	r8a7779_platform_cpu_kill(2);
120	r8a7779_platform_cpu_kill(3);
121}
122
123#ifdef CONFIG_HOTPLUG_CPU
124static int r8a7779_cpu_kill(unsigned int cpu)
125{
126	if (shmobile_smp_scu_cpu_kill(cpu))
127		return r8a7779_platform_cpu_kill(cpu);
128
129	return 0;
130}
131
132static int r8a7779_cpu_disable(unsigned int cpu)
133{
134	/* only CPU1->3 have power domains, do not allow hotplug of CPU0 */
135	return cpu == 0 ? -EPERM : 0;
136}
137#endif /* CONFIG_HOTPLUG_CPU */
138
139struct smp_operations r8a7779_smp_ops  __initdata = {
140	.smp_prepare_cpus	= r8a7779_smp_prepare_cpus,
141	.smp_boot_secondary	= r8a7779_boot_secondary,
142#ifdef CONFIG_HOTPLUG_CPU
143	.cpu_disable		= r8a7779_cpu_disable,
144	.cpu_die		= shmobile_smp_scu_cpu_die,
145	.cpu_kill		= r8a7779_cpu_kill,
146#endif
147};
148