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
  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);