xref: /openbmc/linux/arch/arm/mach-tegra/hotplug.c (revision d2912cb1)
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 
tegra_cpu_kill(unsigned cpu)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  */
tegra_cpu_die(unsigned int cpu)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 
tegra_hotplug_init(void)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