Linux Kernel  3.7.1
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hotplug.c
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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. */
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