arch/arm/mach-shmobile/platsmp.c

   1 /*
   2  * SMP support for R-Mobile / SH-Mobile
   3  *
   4  * Copyright (C) 2010  Magnus Damm
   5  * Copyright (C) 2011  Paul Mundt
   6  *
   7  * Based on vexpress, Copyright (C) 2002 ARM Ltd, All Rights Reserved
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13 #include <linux/init.h>
  14 #include <asm/cacheflush.h>
  15 #include <asm/smp_plat.h>
  16 #include "common.h"
  17
  18 extern unsigned long shmobile_smp_fn[];
  19 extern unsigned long shmobile_smp_arg[];
  20 extern unsigned long shmobile_smp_mpidr[];
  21
  22 void shmobile_smp_hook(unsigned int cpu, unsigned long fn, unsigned long arg)
  23 {
  24         shmobile_smp_fn[cpu] = 0;
  25         flush_cache_all();
  26
  27         shmobile_smp_mpidr[cpu] = cpu_logical_map(cpu);
  28         shmobile_smp_fn[cpu] = fn;
  29         shmobile_smp_arg[cpu] = arg;
  30         flush_cache_all();
  31 }
  32
  33 #ifdef CONFIG_HOTPLUG_CPU
  34 bool shmobile_smp_cpu_can_disable(unsigned int cpu)
  35 {
  36         return true; /* Hotplug of any CPU is supported */
  37 }
  38 #endif
  39
  40 bool __init shmobile_smp_init_fallback_ops(void)
  41 {
  42         /* fallback on PSCI/smp_ops if no other DT based method is detected */
  43         return platform_can_secondary_boot() ? true : false;
  44 }