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192.168.1.100 / T103 / 13eb6a97dabf274443d07c46a6ec8b3392553f08 / . / src / kernel / linux / v4.14 / arch / arm / mach-shmobile / smp-r8a7779.c
blob: c6951ee245889b8f79a83018740c0eea910d60dd [file] [log] [blame]
rjw1f884582022-01-06 17:20:42 +0800[diff] [blame]1/*
2 * SMP support for R-Mobile / SH-Mobile - r8a7779 portion
3 *
4 * Copyright (C) 2011 Renesas Solutions Corp.
5 * Copyright (C) 2011 Magnus Damm
6 *
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.
10 *
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.
15 */
16#include <linux/kernel.h>
17#include <linux/init.h>
18#include <linux/smp.h>
19#include <linux/spinlock.h>
20#include <linux/io.h>
21#include <linux/delay.h>
22#include <linux/soc/renesas/rcar-sysc.h>
23
24#include <asm/cacheflush.h>
25#include <asm/smp_plat.h>
26#include <asm/smp_scu.h>
27
28#include "common.h"
29#include "r8a7779.h"
30
31#define AVECR IOMEM(0xfe700040)
32#define R8A7779_SCU_BASE 0xf0000000
33
34static const struct rcar_sysc_ch r8a7779_ch_cpu1 = {
35 .chan_offs = 0x40, /* PWRSR0 .. PWRER0 */
36 .chan_bit = 1, /* ARM1 */
37 .isr_bit = 1, /* ARM1 */
38};
39
40static const struct rcar_sysc_ch r8a7779_ch_cpu2 = {
41 .chan_offs = 0x40, /* PWRSR0 .. PWRER0 */
42 .chan_bit = 2, /* ARM2 */
43 .isr_bit = 2, /* ARM2 */
44};
45
46static const struct rcar_sysc_ch r8a7779_ch_cpu3 = {
47 .chan_offs = 0x40, /* PWRSR0 .. PWRER0 */
48 .chan_bit = 3, /* ARM3 */
49 .isr_bit = 3, /* ARM3 */
50};
51
52static const struct rcar_sysc_ch * const r8a7779_ch_cpu[4] = {
53 [1] = &r8a7779_ch_cpu1,
54 [2] = &r8a7779_ch_cpu2,
55 [3] = &r8a7779_ch_cpu3,
56};
57
58static int r8a7779_platform_cpu_kill(unsigned int cpu)
59{
60 const struct rcar_sysc_ch *ch = NULL;
61 int ret = -EIO;
62
63 cpu = cpu_logical_map(cpu);
64
65 if (cpu < ARRAY_SIZE(r8a7779_ch_cpu))
66 ch = r8a7779_ch_cpu[cpu];
67
68 if (ch)
69 ret = rcar_sysc_power_down(ch);
70
71 return ret ? ret : 1;
72}
73
74static int r8a7779_boot_secondary(unsigned int cpu, struct task_struct *idle)
75{
76 const struct rcar_sysc_ch *ch = NULL;
77 unsigned int lcpu = cpu_logical_map(cpu);
78 int ret;
79
80 if (lcpu < ARRAY_SIZE(r8a7779_ch_cpu))
81 ch = r8a7779_ch_cpu[lcpu];
82
83 if (ch)
84 ret = rcar_sysc_power_up(ch);
85 else
86 ret = -EIO;
87
88 return ret;
89}
90
91static void __init r8a7779_smp_prepare_cpus(unsigned int max_cpus)
92{
93 /* Map the reset vector (in headsmp-scu.S, headsmp.S) */
94 __raw_writel(__pa(shmobile_boot_vector), AVECR);
95
96 /* setup r8a7779 specific SCU bits */
97 shmobile_smp_scu_prepare_cpus(R8A7779_SCU_BASE, max_cpus);
98
99 r8a7779_pm_init();
100
101 /* power off secondary CPUs */
102 r8a7779_platform_cpu_kill(1);
103 r8a7779_platform_cpu_kill(2);
104 r8a7779_platform_cpu_kill(3);
105}
106
107#ifdef CONFIG_HOTPLUG_CPU
108static int r8a7779_cpu_kill(unsigned int cpu)
109{
110 if (shmobile_smp_scu_cpu_kill(cpu))
111 return r8a7779_platform_cpu_kill(cpu);
112
113 return 0;
114}
115#endif /* CONFIG_HOTPLUG_CPU */
116
117const struct smp_operations r8a7779_smp_ops __initconst = {
118 .smp_prepare_cpus = r8a7779_smp_prepare_cpus,
119 .smp_boot_secondary = r8a7779_boot_secondary,
120#ifdef CONFIG_HOTPLUG_CPU
121 .cpu_die = shmobile_smp_scu_cpu_die,
122 .cpu_kill = r8a7779_cpu_kill,
123#endif
124};