arm/mach-alpine/platsmp.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * SMP operations for Alpine platform.
0004  *
0005  * Copyright (C) 2015 Annapurna Labs Ltd.
0006  */
0007
0008 #include <linux/init.h>
0009 #include <linux/errno.h>
0010 #include <linux/io.h>
0011 #include <linux/of.h>
0012
0013 #include <asm/smp_plat.h>
0014
0015 #include "alpine_cpu_pm.h"
0016
0017 static int alpine_boot_secondary(unsigned int cpu, struct task_struct *idle)
0018 {
0019     phys_addr_t addr;
0020
0021     addr = __pa_symbol(secondary_startup);
0022
0023     if (addr > (phys_addr_t)(uint32_t)(-1)) {
0024         pr_err("FAIL: resume address over 32bit (%pa)", &addr);
0025         return -EINVAL;
0026     }
0027
0028     return alpine_cpu_wakeup(cpu_logical_map(cpu), (uint32_t)addr);
0029 }
0030
0031 static void __init alpine_smp_prepare_cpus(unsigned int max_cpus)
0032 {
0033     alpine_cpu_pm_init();
0034 }
0035
0036 static const struct smp_operations alpine_smp_ops __initconst = {
0037     .smp_prepare_cpus   = alpine_smp_prepare_cpus,
0038     .smp_boot_secondary = alpine_boot_secondary,
0039 };
0040 CPU_METHOD_OF_DECLARE(alpine_smp, "al,alpine-smp", &alpine_smp_ops);