arch/arm/mach-tegra/hotplug.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  Copyright (C) 2002 ARM Ltd.
   4  *  All Rights Reserved
   5  *  Copyright (c) 2010, 2012-2013, NVIDIA Corporation. All rights reserved.
   6  */
   7
   8 #include <linux/clk/tegra.h>
   9 #include <linux/kernel.h>
  10 #include <linux/smp.h>
  11
  12 #include <soc/tegra/common.h>
  13 #include <soc/tegra/fuse.h>
  14
  15 #include <asm/smp_plat.h>
  16
  17 #include "common.h"
  18 #include "sleep.h"
  19
  20 static void (*tegra_hotplug_shutdown)(void);
  21
  22 int tegra_cpu_kill(unsigned cpu)
  23 {
  24         cpu = cpu_logical_map(cpu);
  25
  26         /* Clock gate the CPU */
  27         tegra_wait_cpu_in_reset(cpu);
  28         tegra_disable_cpu_clock(cpu);
  29
  30         return 1;
  31 }
  32
  33 /*
  34  * platform-specific code to shutdown a CPU
  35  *
  36  * Called with IRQs disabled
  37  */
  38 void tegra_cpu_die(unsigned int cpu)
  39 {
  40         if (!tegra_hotplug_shutdown) {
  41                 WARN(1, "hotplug is not yet initialized\n");
  42                 return;
  43         }
  44
  45         /* Clean L1 data cache */
  46         tegra_disable_clean_inv_dcache(TEGRA_FLUSH_CACHE_LOUIS);
  47
  48         /* Shut down the current CPU. */
  49         tegra_hotplug_shutdown();
  50
  51         /* Should never return here. */
  52         BUG();
  53 }
  54
  55 static int __init tegra_hotplug_init(void)
  56 {
  57         if (!IS_ENABLED(CONFIG_HOTPLUG_CPU))
  58                 return 0;
  59
  60         if (!soc_is_tegra())
  61                 return 0;
  62
  63         if (IS_ENABLED(CONFIG_ARCH_TEGRA_2x_SOC) && tegra_get_chip_id() == TEGRA20)
  64                 tegra_hotplug_shutdown = tegra20_hotplug_shutdown;
  65         if (IS_ENABLED(CONFIG_ARCH_TEGRA_3x_SOC) && tegra_get_chip_id() == TEGRA30)
  66                 tegra_hotplug_shutdown = tegra30_hotplug_shutdown;
  67         if (IS_ENABLED(CONFIG_ARCH_TEGRA_114_SOC) && tegra_get_chip_id() == TEGRA114)
  68                 tegra_hotplug_shutdown = tegra30_hotplug_shutdown;
  69         if (IS_ENABLED(CONFIG_ARCH_TEGRA_124_SOC) && tegra_get_chip_id() == TEGRA124)
  70                 tegra_hotplug_shutdown = tegra30_hotplug_shutdown;
  71
  72         return 0;
  73 }
  74 pure_initcall(tegra_hotplug_init);