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
  11 #include <linux/clk/tegra.h>
  12 #include <linux/kernel.h>
  13 #include <linux/smp.h>
  14
  15 #include <soc/tegra/common.h>
  16 #include <soc/tegra/fuse.h>
  17
  18 #include <asm/smp_plat.h>
  19
  20 #include "common.h"
  21 #include "sleep.h"
  22
  23 static void (*tegra_hotplug_shutdown)(void);
  24
  25 int tegra_cpu_kill(unsigned cpu)
  26 {
  27         cpu = cpu_logical_map(cpu);
  28
  29         /* Clock gate the CPU */
  30         tegra_wait_cpu_in_reset(cpu);
  31         tegra_disable_cpu_clock(cpu);
  32
  33         return 1;
  34 }
  35
  36 /*
  37  * platform-specific code to shutdown a CPU
  38  *
  39  * Called with IRQs disabled
  40  */
  41 void tegra_cpu_die(unsigned int cpu)
  42 {
  43         if (!tegra_hotplug_shutdown) {
  44                 WARN(1, "hotplug is not yet initialized\n");
  45                 return;
  46         }
  47
  48         /* Clean L1 data cache */
  49         tegra_disable_clean_inv_dcache(TEGRA_FLUSH_CACHE_LOUIS);
  50
  51         /* Shut down the current CPU. */
  52         tegra_hotplug_shutdown();
  53
  54         /* Should never return here. */
  55         BUG();
  56 }
  57
  58 static int __init tegra_hotplug_init(void)
  59 {
  60         if (!IS_ENABLED(CONFIG_HOTPLUG_CPU))
  61                 return 0;
  62
  63         if (!soc_is_tegra())
  64                 return 0;
  65
  66         if (IS_ENABLED(CONFIG_ARCH_TEGRA_2x_SOC) && tegra_get_chip_id() == TEGRA20)
  67                 tegra_hotplug_shutdown = tegra20_hotplug_shutdown;
  68         if (IS_ENABLED(CONFIG_ARCH_TEGRA_3x_SOC) && tegra_get_chip_id() == TEGRA30)
  69                 tegra_hotplug_shutdown = tegra30_hotplug_shutdown;
  70         if (IS_ENABLED(CONFIG_ARCH_TEGRA_114_SOC) && tegra_get_chip_id() == TEGRA114)
  71                 tegra_hotplug_shutdown = tegra30_hotplug_shutdown;
  72         if (IS_ENABLED(CONFIG_ARCH_TEGRA_124_SOC) && tegra_get_chip_id() == TEGRA124)
  73                 tegra_hotplug_shutdown = tegra30_hotplug_shutdown;
  74
  75         return 0;
  76 }
  77 pure_initcall(tegra_hotplug_init);