1 /*
2 * SMP support for r8a7791
3 *
4 * Copyright (C) 2013 Renesas Solutions Corp.
5 * Copyright (C) 2013 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/io.h>
20
21 #include <asm/smp_plat.h>
22
23 #include "common.h"
24 #include "r8a7791.h"
25 #include "rcar-gen2.h"
26
r8a7791_smp_prepare_cpus(unsigned int max_cpus)27 static void __init r8a7791_smp_prepare_cpus(unsigned int max_cpus)
28 {
29 /* let APMU code install data related to shmobile_boot_vector */
30 shmobile_smp_apmu_prepare_cpus(max_cpus);
31
32 r8a7791_pm_init();
33 }
34
r8a7791_smp_boot_secondary(unsigned int cpu,struct task_struct * idle)35 static int r8a7791_smp_boot_secondary(unsigned int cpu,
36 struct task_struct *idle)
37 {
38 /* Error out when hardware debug mode is enabled */
39 if (rcar_gen2_read_mode_pins() & BIT(21)) {
40 pr_warn("Unable to boot CPU%u when MD21 is set\n", cpu);
41 return -ENOTSUPP;
42 }
43
44 return shmobile_smp_apmu_boot_secondary(cpu, idle);
45 }
46
47 struct smp_operations r8a7791_smp_ops __initdata = {
48 .smp_prepare_cpus = r8a7791_smp_prepare_cpus,
49 .smp_boot_secondary = r8a7791_smp_boot_secondary,
50 #ifdef CONFIG_HOTPLUG_CPU
51 .cpu_disable = shmobile_smp_cpu_disable,
52 .cpu_die = shmobile_smp_apmu_cpu_die,
53 .cpu_kill = shmobile_smp_apmu_cpu_kill,
54 #endif
55 };
56