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 
r8a7779_boot_secondary(unsigned int cpu,struct task_struct * idle)28 static 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 
r8a7779_smp_prepare_cpus(unsigned int max_cpus)39 static void __init r8a7779_smp_prepare_cpus(unsigned int max_cpus)
40 {
41 	void __iomem *base = ioremap(HPBREG_BASE, 0x1000);
42 
43 	/* Map the reset vector (in headsmp-scu.S, headsmp.S) */
44 	writel(__pa(shmobile_boot_vector), base + AVECR);
45 
46 	/* setup r8a7779 specific SCU bits */
47 	shmobile_smp_scu_prepare_cpus(R8A7779_SCU_BASE, max_cpus);
48 
49 	iounmap(base);
50 }
51 
52 #ifdef CONFIG_HOTPLUG_CPU
r8a7779_platform_cpu_kill(unsigned int cpu)53 static int r8a7779_platform_cpu_kill(unsigned int cpu)
54 {
55 	int ret = -EIO;
56 
57 	cpu = cpu_logical_map(cpu);
58 	if (cpu)
59 		ret = rcar_sysc_power_down_cpu(cpu);
60 
61 	return ret ? ret : 1;
62 }
63 
r8a7779_cpu_kill(unsigned int cpu)64 static int r8a7779_cpu_kill(unsigned int cpu)
65 {
66 	if (shmobile_smp_scu_cpu_kill(cpu))
67 		return r8a7779_platform_cpu_kill(cpu);
68 
69 	return 0;
70 }
71 #endif /* CONFIG_HOTPLUG_CPU */
72 
73 const struct smp_operations r8a7779_smp_ops  __initconst = {
74 	.smp_prepare_cpus	= r8a7779_smp_prepare_cpus,
75 	.smp_boot_secondary	= r8a7779_boot_secondary,
76 #ifdef CONFIG_HOTPLUG_CPU
77 	.cpu_die		= shmobile_smp_scu_cpu_die,
78 	.cpu_kill		= r8a7779_cpu_kill,
79 #endif
80 };
81