LXR linux/arch/arm/mach-imx/hotplug.c

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * Copyright 2011 Freescale Semiconductor, Inc.
   4 * Copyright 2011 Linaro Ltd.
   5 */
   6
   7#include <linux/errno.h>
   8#include <linux/jiffies.h>
   9#include <asm/cacheflush.h>
  10#include <asm/cp15.h>
  11#include <asm/proc-fns.h>
  12
  13#include "common.h"
  14
  15/*
  16 * platform-specific code to shutdown a CPU
  17 *
  18 * Called with IRQs disabled
  19 */
  20void imx_cpu_die(unsigned int cpu)
  21{
  22        v7_exit_coherency_flush(louis);
  23        /*
  24         * We use the cpu jumping argument register to sync with
  25         * imx_cpu_kill() which is running on cpu0 and waiting for
  26         * the register being cleared to kill the cpu.
  27         */
  28        imx_set_cpu_arg(cpu, ~0);
  29
  30        while (1)
  31                cpu_do_idle();
  32}
  33
  34int imx_cpu_kill(unsigned int cpu)
  35{
  36        unsigned long timeout = jiffies + msecs_to_jiffies(50);
  37
  38        while (imx_get_cpu_arg(cpu) == 0)
  39                if (time_after(jiffies, timeout))
  40                        return 0;
  41        imx_enable_cpu(cpu, false);
  42        imx_set_cpu_arg(cpu, 0);
  43        return 1;
  44}
  45