arch/arm/mach-imx/hotplug.c

   1 /*
   2  * Copyright 2011 Freescale Semiconductor, Inc.
   3  * Copyright 2011 Linaro Ltd.
   4  *
   5  * The code contained herein is licensed under the GNU General Public
   6  * License. You may obtain a copy of the GNU General Public License
   7  * Version 2 or later at the following locations:
   8  *
   9  * http://www.opensource.org/licenses/gpl-license.html
  10  * http://www.gnu.org/copyleft/gpl.html
  11  */
  12
  13 #include <linux/errno.h>
  14 #include <asm/cacheflush.h>
  15 #include <mach/common.h>
  16
  17 int platform_cpu_kill(unsigned int cpu)
  18 {
  19         return 1;
  20 }
  21
  22 /*
  23  * platform-specific code to shutdown a CPU
  24  *
  25  * Called with IRQs disabled
  26  */
  27 void platform_cpu_die(unsigned int cpu)
  28 {
  29         flush_cache_all();
  30         imx_enable_cpu(cpu, false);
  31         cpu_do_idle();
  32
  33         /* We should never return from idle */
  34         panic("cpu %d unexpectedly exit from shutdown\n", cpu);
  35 }
  36
  37 int platform_cpu_disable(unsigned int cpu)
  38 {
  39         /*
  40          * we don't allow CPU 0 to be shutdown (it is still too special
  41          * e.g. clock tick interrupts)
  42          */
  43         return cpu == 0 ? -EPERM : 0;
  44 }