LXR linux/arch/arm/mach-alpine/platsmp.c

   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
  17static 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
  31static void __init alpine_smp_prepare_cpus(unsigned int max_cpus)
  32{
  33        alpine_cpu_pm_init();
  34}
  35
  36static const struct smp_operations alpine_smp_ops __initconst = {
  37        .smp_prepare_cpus       = alpine_smp_prepare_cpus,
  38        .smp_boot_secondary     = alpine_boot_secondary,
  39};
  40CPU_METHOD_OF_DECLARE(alpine_smp, "al,alpine-smp", &alpine_smp_ops);
  41