2 * SMP support for R-Mobile / SH-Mobile - r8a7779 portion
4 * Copyright (C) 2011 Renesas Solutions Corp.
5 * Copyright (C) 2011 Magnus Damm
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.
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.
16 #include <linux/kernel.h>
17 #include <linux/init.h>
18 #include <linux/smp.h>
19 #include <linux/spinlock.h>
21 #include <linux/delay.h>
23 #include <asm/cacheflush.h>
24 #include <asm/smp_plat.h>
25 #include <asm/smp_scu.h>
26 #include <asm/smp_twd.h>
32 #define AVECR IOMEM(0xfe700040)
33 #define R8A7779_SCU_BASE 0xf0000000
35 static struct rcar_sysc_ch r8a7779_ch_cpu1 = {
36 .chan_offs = 0x40, /* PWRSR0 .. PWRER0 */
37 .chan_bit = 1, /* ARM1 */
38 .isr_bit = 1, /* ARM1 */
41 static struct rcar_sysc_ch r8a7779_ch_cpu2 = {
42 .chan_offs = 0x40, /* PWRSR0 .. PWRER0 */
43 .chan_bit = 2, /* ARM2 */
44 .isr_bit = 2, /* ARM2 */
47 static struct rcar_sysc_ch r8a7779_ch_cpu3 = {
48 .chan_offs = 0x40, /* PWRSR0 .. PWRER0 */
49 .chan_bit = 3, /* ARM3 */
50 .isr_bit = 3, /* ARM3 */
53 static struct rcar_sysc_ch *r8a7779_ch_cpu[4] = {
54 [1] = &r8a7779_ch_cpu1,
55 [2] = &r8a7779_ch_cpu2,
56 [3] = &r8a7779_ch_cpu3,
59 #ifdef CONFIG_HAVE_ARM_TWD
60 static DEFINE_TWD_LOCAL_TIMER(twd_local_timer, R8A7779_SCU_BASE + 0x600, 29);
61 void __init r8a7779_register_twd(void)
63 twd_local_timer_register(&twd_local_timer);
67 static int r8a7779_platform_cpu_kill(unsigned int cpu)
69 struct rcar_sysc_ch *ch = NULL;
72 cpu = cpu_logical_map(cpu);
74 if (cpu < ARRAY_SIZE(r8a7779_ch_cpu))
75 ch = r8a7779_ch_cpu[cpu];
78 ret = rcar_sysc_power_down(ch);
83 static int r8a7779_boot_secondary(unsigned int cpu, struct task_struct *idle)
85 struct rcar_sysc_ch *ch = NULL;
86 unsigned int lcpu = cpu_logical_map(cpu);
89 if (lcpu < ARRAY_SIZE(r8a7779_ch_cpu))
90 ch = r8a7779_ch_cpu[lcpu];
93 ret = rcar_sysc_power_up(ch);
100 static void __init r8a7779_smp_prepare_cpus(unsigned int max_cpus)
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;
107 /* setup r8a7779 specific SCU bits */
108 shmobile_scu_base = IOMEM(R8A7779_SCU_BASE);
109 shmobile_smp_scu_prepare_cpus(max_cpus);
113 /* power off secondary CPUs */
114 r8a7779_platform_cpu_kill(1);
115 r8a7779_platform_cpu_kill(2);
116 r8a7779_platform_cpu_kill(3);
119 #ifdef CONFIG_HOTPLUG_CPU
120 static int r8a7779_cpu_kill(unsigned int cpu)
122 if (shmobile_smp_scu_cpu_kill(cpu))
123 return r8a7779_platform_cpu_kill(cpu);
128 static int r8a7779_cpu_disable(unsigned int cpu)
130 /* only CPU1->3 have power domains, do not allow hotplug of CPU0 */
131 return cpu == 0 ? -EPERM : 0;
133 #endif /* CONFIG_HOTPLUG_CPU */
135 struct smp_operations r8a7779_smp_ops __initdata = {
136 .smp_prepare_cpus = r8a7779_smp_prepare_cpus,
137 .smp_boot_secondary = r8a7779_boot_secondary,
138 #ifdef CONFIG_HOTPLUG_CPU
139 .cpu_disable = r8a7779_cpu_disable,
140 .cpu_die = shmobile_smp_scu_cpu_die,
141 .cpu_kill = r8a7779_cpu_kill,