arch/arm/mach-shmobile/hotplug.c

   1 /*
   2  * SMP support for R-Mobile / SH-Mobile
   3  *
   4  * Copyright (C) 2010  Magnus Damm
   5  *
   6  * Based on realview, Copyright (C) 2002 ARM Ltd, All Rights Reserved
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12 #include <linux/kernel.h>
  13 #include <linux/errno.h>
  14 #include <linux/smp.h>
  15
  16 int platform_cpu_kill(unsigned int cpu)
  17 {
  18         return 1;
  19 }
  20
  21 void platform_cpu_die(unsigned int cpu)
  22 {
  23         while (1) {
  24                 /*
  25                  * here's the WFI
  26                  */
  27                 asm(".word      0xe320f003\n"
  28                     :
  29                     :
  30                     : "memory", "cc");
  31         }
  32 }
  33
  34 int platform_cpu_disable(unsigned int cpu)
  35 {
  36         /*
  37          * we don't allow CPU 0 to be shutdown (it is still too special
  38          * e.g. clock tick interrupts)
  39          */
  40         return cpu == 0 ? -EPERM : 0;
  41 }