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 HPBREG_BASE 0xfe700000
24#define AVECR 0x0040 /* ARM Reset Vector Address Register */
25
26#define R8A7779_SCU_BASE 0xf0000000
27
28static int r8a7779_boot_secondary(unsigned int cpu, struct task_struct *idle)
29{
30 int ret = -EIO;
31
32 cpu = cpu_logical_map(cpu);
33 if (cpu)
34 ret = rcar_sysc_power_up_cpu(cpu);
35
36 return ret;
37}
38
39static void __init r8a7779_smp_prepare_cpus(unsigned int max_cpus)
40{
41 void __iomem *base;
42
43 if (!request_mem_region(0, SZ_4K, "Boot Area")) {
44 pr_err("Failed to request boot area\n");
45 return;
46 }
47
48 base = ioremap(HPBREG_BASE, size: 0x1000);
49
50 /* Map the reset vector (in headsmp-scu.S, headsmp.S) */
51 writel(__pa(shmobile_boot_vector), addr: base + AVECR);
52
53 /* setup r8a7779 specific SCU bits */
54 shmobile_smp_scu_prepare_cpus(R8A7779_SCU_BASE, max_cpus);
55
56 iounmap(addr: base);
57}
58
59#ifdef CONFIG_HOTPLUG_CPU
60static int r8a7779_platform_cpu_kill(unsigned int cpu)
61{
62 int ret = -EIO;
63
64 cpu = cpu_logical_map(cpu);
65 if (cpu)
66 ret = rcar_sysc_power_down_cpu(cpu);
67
68 return ret ? ret : 1;
69}
70
71static int r8a7779_cpu_kill(unsigned int cpu)
72{
73 if (shmobile_smp_scu_cpu_kill(cpu))
74 return r8a7779_platform_cpu_kill(cpu);
75
76 return 0;
77}
78#endif /* CONFIG_HOTPLUG_CPU */
79
80const struct smp_operations r8a7779_smp_ops __initconst = {
81 .smp_prepare_cpus = r8a7779_smp_prepare_cpus,
82 .smp_boot_secondary = r8a7779_boot_secondary,
83#ifdef CONFIG_HOTPLUG_CPU
84 .cpu_die = shmobile_smp_scu_cpu_die,
85 .cpu_kill = r8a7779_cpu_kill,
86#endif
87};
88

source code of linux/arch/arm/mach-shmobile/smp-r8a7779.c