arch/arm/mach-tegra/hotplug.c

   1 /*
   2  *  Copyright (C) 2002 ARM Ltd.
   3  *  All Rights Reserved
   4  *  Copyright (c) 2010, 2012-2013, NVIDIA Corporation. All rights reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10 #include <linux/kernel.h>
  11 #include <linux/smp.h>
  12 #include <linux/clk/tegra.h>
  13
  14 #include <asm/smp_plat.h>
  15
  16 #include "fuse.h"
  17 #include "sleep.h"
  18
  19 static void (*tegra_hotplug_shutdown)(void);
  20
  21 int tegra_cpu_kill(unsigned cpu)
  22 {
  23         cpu = cpu_logical_map(cpu);
  24
  25         /* Clock gate the CPU */
  26         tegra_wait_cpu_in_reset(cpu);
  27         tegra_disable_cpu_clock(cpu);
  28
  29         return 1;
  30 }
  31
  32 /*
  33  * platform-specific code to shutdown a CPU
  34  *
  35  * Called with IRQs disabled
  36  */
  37 void __ref tegra_cpu_die(unsigned int cpu)
  38 {
  39         /* Clean L1 data cache */
  40         tegra_disable_clean_inv_dcache(TEGRA_FLUSH_CACHE_LOUIS);
  41
  42         /* Shut down the current CPU. */
  43         tegra_hotplug_shutdown();
  44
  45         /* Should never return here. */
  46         BUG();
  47 }
  48
  49 void __init tegra_hotplug_init(void)
  50 {
  51         if (!IS_ENABLED(CONFIG_HOTPLUG_CPU))
  52                 return;
  53
  54         if (IS_ENABLED(CONFIG_ARCH_TEGRA_2x_SOC) && tegra_chip_id == TEGRA20)
  55                 tegra_hotplug_shutdown = tegra20_hotplug_shutdown;
  56         if (IS_ENABLED(CONFIG_ARCH_TEGRA_3x_SOC) && tegra_chip_id == TEGRA30)
  57                 tegra_hotplug_shutdown = tegra30_hotplug_shutdown;
  58         if (IS_ENABLED(CONFIG_ARCH_TEGRA_114_SOC) && tegra_chip_id == TEGRA114)
  59                 tegra_hotplug_shutdown = tegra30_hotplug_shutdown;
  60 }