1 /* 2 * 3 * Copyright (C) 2002 ARM Ltd. 4 * All Rights Reserved 5 * Copyright (c) 2010, 2012 NVIDIA Corporation. All rights reserved. 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 */ 11 #include <linux/kernel.h> 12 #include <linux/smp.h> 13 14 #include <asm/cacheflush.h> 15 #include <asm/smp_plat.h> 16 17 #include "sleep.h" 18 #include "tegra_cpu_car.h" 19 20 static void (*tegra_hotplug_shutdown)(void); 21 22 /* 23 * platform-specific code to shutdown a CPU 24 * 25 * Called with IRQs disabled 26 */ 27 void __ref tegra_cpu_die(unsigned int cpu) 28 { 29 cpu = cpu_logical_map(cpu); 30 31 /* Flush the L1 data cache. */ 32 flush_cache_all(); 33 34 /* Shut down the current CPU. */ 35 tegra_hotplug_shutdown(); 36 37 /* Clock gate the CPU */ 38 tegra_wait_cpu_in_reset(cpu); 39 tegra_disable_cpu_clock(cpu); 40 41 /* Should never return here. */ 42 BUG(); 43 } 44 45 int tegra_cpu_disable(unsigned int cpu) 46 { 47 /* 48 * we don't allow CPU 0 to be shutdown (it is still too special 49 * e.g. clock tick interrupts) 50 */ 51 return cpu == 0 ? -EPERM : 0; 52 } 53 54 #ifdef CONFIG_ARCH_TEGRA_2x_SOC 55 extern void tegra20_hotplug_shutdown(void); 56 void __init tegra20_hotplug_init(void) 57 { 58 tegra_hotplug_shutdown = tegra20_hotplug_shutdown; 59 } 60 #endif 61 62 #ifdef CONFIG_ARCH_TEGRA_3x_SOC 63 extern void tegra30_hotplug_shutdown(void); 64 void __init tegra30_hotplug_init(void) 65 { 66 tegra_hotplug_shutdown = tegra30_hotplug_shutdown; 67 } 68 #endif 69