smp-r8a7779.c revision e9e7c4fbf468e205387b21463dddacfe44da2d9a 
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#include <mach/common.h>
27#include <mach/r8a7779.h>
28#include <asm/cacheflush.h>
29#include <asm/smp_plat.h>
30#include <asm/smp_scu.h>
31#include <asm/smp_twd.h>
32
33#define AVECR IOMEM(0xfe700040)
34#define R8A7779_SCU_BASE 0xf0000000
35
36static struct r8a7779_pm_ch r8a7779_ch_cpu1 = {
37	.chan_offs = 0x40, /* PWRSR0 .. PWRER0 */
38	.chan_bit = 1, /* ARM1 */
39	.isr_bit = 1, /* ARM1 */
40};
41
42static struct r8a7779_pm_ch r8a7779_ch_cpu2 = {
43	.chan_offs = 0x40, /* PWRSR0 .. PWRER0 */
44	.chan_bit = 2, /* ARM2 */
45	.isr_bit = 2, /* ARM2 */
46};
47
48static struct r8a7779_pm_ch r8a7779_ch_cpu3 = {
49	.chan_offs = 0x40, /* PWRSR0 .. PWRER0 */
50	.chan_bit = 3, /* ARM3 */
51	.isr_bit = 3, /* ARM3 */
52};
53
54static struct r8a7779_pm_ch *r8a7779_ch_cpu[4] = {
55	[1] = &r8a7779_ch_cpu1,
56	[2] = &r8a7779_ch_cpu2,
57	[3] = &r8a7779_ch_cpu3,
58};
59
60#ifdef CONFIG_HAVE_ARM_TWD
61static DEFINE_TWD_LOCAL_TIMER(twd_local_timer, R8A7779_SCU_BASE + 0x600, 29);
62void __init r8a7779_register_twd(void)
63{
64	twd_local_timer_register(&twd_local_timer);
65}
66#endif
67
68static int r8a7779_platform_cpu_kill(unsigned int cpu)
69{
70	struct r8a7779_pm_ch *ch = NULL;
71	int ret = -EIO;
72
73	cpu = cpu_logical_map(cpu);
74
75	if (cpu < ARRAY_SIZE(r8a7779_ch_cpu))
76		ch = r8a7779_ch_cpu[cpu];
77
78	if (ch)
79		ret = r8a7779_sysc_power_down(ch);
80
81	return ret ? ret : 1;
82}
83
84static int __cpuinit r8a7779_boot_secondary(unsigned int cpu, struct task_struct *idle)
85{
86	struct r8a7779_pm_ch *ch = NULL;
87	unsigned int lcpu = cpu_logical_map(cpu);
88	int ret;
89
90	ret = shmobile_smp_scu_boot_secondary(cpu, idle);
91	if (ret)
92		return ret;
93
94	if (lcpu < ARRAY_SIZE(r8a7779_ch_cpu))
95		ch = r8a7779_ch_cpu[lcpu];
96
97	if (ch)
98		ret = r8a7779_sysc_power_up(ch);
99	else
100		ret = -EIO;
101
102	return ret;
103}
104
105static void __init r8a7779_smp_prepare_cpus(unsigned int max_cpus)
106{
107	/* Map the reset vector (in headsmp-scu.S, headsmp.S) */
108	__raw_writel(__pa(shmobile_boot_vector), AVECR);
109	shmobile_boot_fn = virt_to_phys(shmobile_boot_scu);
110	shmobile_boot_arg = (unsigned long)shmobile_scu_base;
111
112	/* setup r8a7779 specific SCU bits */
113	shmobile_scu_base = IOMEM(R8A7779_SCU_BASE);
114	shmobile_smp_scu_prepare_cpus(max_cpus);
115
116	r8a7779_pm_init();
117
118	/* power off secondary CPUs */
119	r8a7779_platform_cpu_kill(1);
120	r8a7779_platform_cpu_kill(2);
121	r8a7779_platform_cpu_kill(3);
122}
123
124#ifdef CONFIG_HOTPLUG_CPU
125static int r8a7779_cpu_kill(unsigned int cpu)
126{
127	if (shmobile_smp_scu_cpu_kill(cpu))
128		return r8a7779_platform_cpu_kill(cpu);
129
130	return 0;
131}
132
133static int r8a7779_cpu_disable(unsigned int cpu)
134{
135	/* only CPU1->3 have power domains, do not allow hotplug of CPU0 */
136	return cpu == 0 ? -EPERM : 0;
137}
138#endif /* CONFIG_HOTPLUG_CPU */
139
140struct smp_operations r8a7779_smp_ops  __initdata = {
141	.smp_prepare_cpus	= r8a7779_smp_prepare_cpus,
142	.smp_boot_secondary	= r8a7779_boot_secondary,
143#ifdef CONFIG_HOTPLUG_CPU
144	.cpu_disable		= r8a7779_cpu_disable,
145	.cpu_die		= shmobile_smp_scu_cpu_die,
146	.cpu_kill		= r8a7779_cpu_kill,
147#endif
148};
149