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c942fddf | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
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2 | /* |
3 | * SMP operations for Alpine platform. | |
4 | * | |
5 | * Copyright (C) 2015 Annapurna Labs Ltd. | |
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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 | ||
64fc2a94 | 21 | addr = __pa_symbol(secondary_startup); |
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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 | ||
75305275 | 36 | static const struct smp_operations alpine_smp_ops __initconst = { |
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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); |