1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * SMP operations for Alpine platform.
4 *
5 * Copyright (C) 2015 Annapurna Labs Ltd.
6 */
7
8 #include <linux/init.h>
9 #include <linux/errno.h>
10 #include <linux/io.h>
11 #include <linux/of.h>
12
13 #include <asm/smp_plat.h>
14
15 #include "alpine_cpu_pm.h"
16
17 static int alpine_boot_secondary(unsigned int cpu, struct task_struct *idle)
18 {
19 phys_addr_t addr;
20
21 addr = __pa_symbol(secondary_startup);
22
23 if (addr > (phys_addr_t)(uint32_t)(-1)) {
24 pr_err("FAIL: resume address over 32bit (%pa)", &addr);
25 return -EINVAL;
26 }
27
28 return alpine_cpu_wakeup(cpu_logical_map(cpu), (uint32_t)addr);
29 }
30
31 static void __init alpine_smp_prepare_cpus(unsigned int max_cpus)
32 {
33 alpine_cpu_pm_init();
34 }
35
36 static const struct smp_operations alpine_smp_ops __initconst = {
37 .smp_prepare_cpus = alpine_smp_prepare_cpus,
38 .smp_boot_secondary = alpine_boot_secondary,
39 };
40 CPU_METHOD_OF_DECLARE(alpine_smp, "al,alpine-smp", &alpine_smp_ops);
41
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