hotplug.c revision 304664eab93f9e95a8d28fbd9702ede88bb10cc5 
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/fuse.h>
16
17#include <asm/smp_plat.h>
18
19#include "sleep.h"
20
21static void (*tegra_hotplug_shutdown)(void);
22
23int tegra_cpu_kill(unsigned cpu)
24{
25	cpu = cpu_logical_map(cpu);
26
27	/* Clock gate the CPU */
28	tegra_wait_cpu_in_reset(cpu);
29	tegra_disable_cpu_clock(cpu);
30
31	return 1;
32}
33
34/*
35 * platform-specific code to shutdown a CPU
36 *
37 * Called with IRQs disabled
38 */
39void __ref tegra_cpu_die(unsigned int cpu)
40{
41	/* Clean L1 data cache */
42	tegra_disable_clean_inv_dcache(TEGRA_FLUSH_CACHE_LOUIS);
43
44	/* Shut down the current CPU. */
45	tegra_hotplug_shutdown();
46
47	/* Should never return here. */
48	BUG();
49}
50
51void __init tegra_hotplug_init(void)
52{
53	if (!IS_ENABLED(CONFIG_HOTPLUG_CPU))
54		return;
55
56	if (IS_ENABLED(CONFIG_ARCH_TEGRA_2x_SOC) && tegra_get_chip_id() == TEGRA20)
57		tegra_hotplug_shutdown = tegra20_hotplug_shutdown;
58	if (IS_ENABLED(CONFIG_ARCH_TEGRA_3x_SOC) && tegra_get_chip_id() == TEGRA30)
59		tegra_hotplug_shutdown = tegra30_hotplug_shutdown;
60	if (IS_ENABLED(CONFIG_ARCH_TEGRA_114_SOC) && tegra_get_chip_id() == TEGRA114)
61		tegra_hotplug_shutdown = tegra30_hotplug_shutdown;
62	if (IS_ENABLED(CONFIG_ARCH_TEGRA_124_SOC) && tegra_get_chip_id() == TEGRA124)
63		tegra_hotplug_shutdown = tegra30_hotplug_shutdown;
64}
65