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);
75
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