1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * arch/powerpc/platforms/embedded6xx/gamecube.c
4  *
5  * Nintendo GameCube board-specific support
6  * Copyright (C) 2004-2009 The GameCube Linux Team
7  * Copyright (C) 2007,2008,2009 Albert Herranz
8  */
9 
10 #include <linux/kernel.h>
11 #include <linux/init.h>
12 #include <linux/irq.h>
13 #include <linux/kexec.h>
14 #include <linux/seq_file.h>
15 #include <linux/of_platform.h>
16 
17 #include <asm/io.h>
18 #include <asm/machdep.h>
19 #include <asm/prom.h>
20 #include <asm/time.h>
21 #include <asm/udbg.h>
22 
23 #include "flipper-pic.h"
24 #include "usbgecko_udbg.h"
25 
26 
27 static void __noreturn gamecube_spin(void)
28 {
29 	/* spin until power button pressed */
30 	for (;;)
31 		cpu_relax();
32 }
33 
34 static void __noreturn gamecube_restart(char *cmd)
35 {
36 	local_irq_disable();
37 	flipper_platform_reset();
38 	gamecube_spin();
39 }
40 
41 static void gamecube_power_off(void)
42 {
43 	local_irq_disable();
44 	gamecube_spin();
45 }
46 
47 static void __noreturn gamecube_halt(void)
48 {
49 	gamecube_restart(NULL);
50 }
51 
52 static int __init gamecube_probe(void)
53 {
54 	if (!of_machine_is_compatible("nintendo,gamecube"))
55 		return 0;
56 
57 	pm_power_off = gamecube_power_off;
58 
59 	ug_udbg_init();
60 
61 	return 1;
62 }
63 
64 static void gamecube_shutdown(void)
65 {
66 	flipper_quiesce();
67 }
68 
69 define_machine(gamecube) {
70 	.name			= "gamecube",
71 	.probe			= gamecube_probe,
72 	.restart		= gamecube_restart,
73 	.halt			= gamecube_halt,
74 	.init_IRQ		= flipper_pic_probe,
75 	.get_irq		= flipper_pic_get_irq,
76 	.calibrate_decr		= generic_calibrate_decr,
77 	.progress		= udbg_progress,
78 	.machine_shutdown	= gamecube_shutdown,
79 };
80 
81 
82 static const struct of_device_id gamecube_of_bus[] = {
83 	{ .compatible = "nintendo,flipper", },
84 	{ },
85 };
86 
87 static int __init gamecube_device_probe(void)
88 {
89 	if (!machine_is(gamecube))
90 		return 0;
91 
92 	of_platform_bus_probe(NULL, gamecube_of_bus, NULL);
93 	return 0;
94 }
95 device_initcall(gamecube_device_probe);
96 
97