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); 78