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omap-hotplug.c

/*
 * OMAP4 SMP cpu-hotplug support
 *
 * Copyright (C) 2010 Texas Instruments, Inc.
 * Author:
 *      Santosh Shilimkar <santosh.shilimkar@ti.com>
 *
 * Platform file needed for the OMAP4 SMP. This file is based on arm
 * realview smp platform.
 * Copyright (c) 2002 ARM Limited.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/smp.h>

#include <asm/cacheflush.h>
#include <mach/omap4-common.h>

int platform_cpu_kill(unsigned int cpu)
{
      return 1;
}

/*
 * platform-specific code to shutdown a CPU
 * Called with IRQs disabled
 */
void platform_cpu_die(unsigned int cpu)
{
      flush_cache_all();
      dsb();

      /*
       * we're ready for shutdown now, so do it
       */
      if (omap_modify_auxcoreboot0(0x0, 0x200) != 0x0)
            printk(KERN_CRIT "Secure clear status failed\n");

      for (;;) {
            /*
             * Execute WFI
             */
            do_wfi();

            if (omap_read_auxcoreboot0() == cpu) {
                  /*
                   * OK, proper wakeup, we're done
                   */
                  break;
            }
            pr_debug("CPU%u: spurious wakeup call\n", cpu);
      }
}

int platform_cpu_disable(unsigned int cpu)
{
      /*
       * we don't allow CPU 0 to be shutdown (it is still too special
       * e.g. clock tick interrupts)
       */
      return cpu == 0 ? -EPERM : 0;
}

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