arch/arm/mach-ux500/hotplug.c

   1 /*
   2  * Copyright (C) STMicroelectronics 2009
   3  * Copyright (C) ST-Ericsson SA 2010
   4  *
   5  * License Terms: GNU General Public License v2
   6  *      Based on ARM realview platform
   7  *
   8  * Author: Sundar Iyer <sundar.iyer@stericsson.com>
   9  *
  10  */
  11 #include <linux/kernel.h>
  12 #include <linux/errno.h>
  13 #include <linux/smp.h>
  14
  15 #include <asm/smp_plat.h>
  16
  17 #include "setup.h"
  18
  19 /*
  20  * platform-specific code to shutdown a CPU
  21  *
  22  * Called with IRQs disabled
  23  */
  24 void __ref ux500_cpu_die(unsigned int cpu)
  25 {
  26         /* directly enter low power state, skipping secure registers */
  27         for (;;) {
  28                 __asm__ __volatile__("dsb\n\t" "wfi\n\t"
  29                                 : : : "memory");
  30                 if (pen_release == cpu_logical_map(cpu)) {
  31                         /*
  32                          * OK, proper wakeup, we're done
  33                          */
  34                         break;
  35                 }
  36         }
  37 }