Merge branch 'spectre' of git://git.armlinux.org.uk/~rmk/linux-arm
[linux-2.6-microblaze.git] / arch / arm / mach-shmobile / smp-r8a7779.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * SMP support for R-Mobile / SH-Mobile - r8a7779 portion
4  *
5  * Copyright (C) 2011  Renesas Solutions Corp.
6  * Copyright (C) 2011  Magnus Damm
7  */
8 #include <linux/kernel.h>
9 #include <linux/init.h>
10 #include <linux/smp.h>
11 #include <linux/spinlock.h>
12 #include <linux/io.h>
13 #include <linux/delay.h>
14 #include <linux/soc/renesas/rcar-sysc.h>
15
16 #include <asm/cacheflush.h>
17 #include <asm/smp_plat.h>
18 #include <asm/smp_scu.h>
19
20 #include "common.h"
21 #include "r8a7779.h"
22
23 #define AVECR IOMEM(0xfe700040)
24 #define R8A7779_SCU_BASE 0xf0000000
25
26 static int r8a7779_boot_secondary(unsigned int cpu, struct task_struct *idle)
27 {
28         int ret = -EIO;
29
30         cpu = cpu_logical_map(cpu);
31         if (cpu)
32                 ret = rcar_sysc_power_up_cpu(cpu);
33
34         return ret;
35 }
36
37 static void __init r8a7779_smp_prepare_cpus(unsigned int max_cpus)
38 {
39         /* Map the reset vector (in headsmp-scu.S, headsmp.S) */
40         __raw_writel(__pa(shmobile_boot_vector), AVECR);
41
42         /* setup r8a7779 specific SCU bits */
43         shmobile_smp_scu_prepare_cpus(R8A7779_SCU_BASE, max_cpus);
44 }
45
46 #ifdef CONFIG_HOTPLUG_CPU
47 static int r8a7779_platform_cpu_kill(unsigned int cpu)
48 {
49         int ret = -EIO;
50
51         cpu = cpu_logical_map(cpu);
52         if (cpu)
53                 ret = rcar_sysc_power_down_cpu(cpu);
54
55         return ret ? ret : 1;
56 }
57
58 static int r8a7779_cpu_kill(unsigned int cpu)
59 {
60         if (shmobile_smp_scu_cpu_kill(cpu))
61                 return r8a7779_platform_cpu_kill(cpu);
62
63         return 0;
64 }
65 #endif /* CONFIG_HOTPLUG_CPU */
66
67 const struct smp_operations r8a7779_smp_ops  __initconst = {
68         .smp_prepare_cpus       = r8a7779_smp_prepare_cpus,
69         .smp_boot_secondary     = r8a7779_boot_secondary,
70 #ifdef CONFIG_HOTPLUG_CPU
71         .cpu_die                = shmobile_smp_scu_cpu_die,
72         .cpu_kill               = r8a7779_cpu_kill,
73 #endif
74 };