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