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