linux/arch/arm64/kernel/smp_psci.c
<<
>>
Prefs
   1/*
   2 * PSCI SMP initialisation
   3 *
   4 * Copyright (C) 2013 ARM Ltd.
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License version 2 as
   8 * published by the Free Software Foundation.
   9 *
  10 * This program is distributed in the hope that it will be useful,
  11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 * GNU General Public License for more details.
  14 *
  15 * You should have received a copy of the GNU General Public License
  16 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17 */
  18
  19#include <linux/init.h>
  20#include <linux/of.h>
  21#include <linux/smp.h>
  22
  23#include <asm/psci.h>
  24#include <asm/smp_plat.h>
  25
  26static int __init smp_psci_init_cpu(struct device_node *dn, int cpu)
  27{
  28        return 0;
  29}
  30
  31static int __init smp_psci_prepare_cpu(int cpu)
  32{
  33        int err;
  34
  35        if (!psci_ops.cpu_on) {
  36                pr_err("psci: no cpu_on method, not booting CPU%d\n", cpu);
  37                return -ENODEV;
  38        }
  39
  40        err = psci_ops.cpu_on(cpu_logical_map(cpu), __pa(secondary_holding_pen));
  41        if (err) {
  42                pr_err("psci: failed to boot CPU%d (%d)\n", cpu, err);
  43                return err;
  44        }
  45
  46        return 0;
  47}
  48
  49const struct smp_enable_ops smp_psci_ops __initconst = {
  50        .name           = "psci",
  51        .init_cpu       = smp_psci_init_cpu,
  52        .prepare_cpu    = smp_psci_prepare_cpu,
  53};
  54