resetbtn.c revision 1.1 
1/* $NetBSD: resetbtn.c,v 1.1 2026/01/09 22:54:30 jmcneill Exp $ */
2
3/*-
4 * Copyright (c) 2024 Jared McNeill <jmcneill@invisible.ca>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30__KERNEL_RCSID(0, "$NetBSD: resetbtn.c,v 1.1 2026/01/09 22:54:30 jmcneill Exp $");
31
32#include <sys/param.h>
33#include <sys/bus.h>
34#include <sys/device.h>
35#include <sys/systm.h>
36#include <sys/reboot.h>
37#include <powerpc/pio.h>
38#include <machine/wii.h>
39#include <machine/wiiu.h>
40#include <dev/sysmon/sysmonvar.h>
41#include <dev/sysmon/sysmon_taskq.h>
42
43#include "ahb.h"
44
45#define	PI_INTERRUPT_CAUSE	0x0c003000
46#define	 RESET_SWITCH_STATE	__BIT(16)
47
48static int	resetbtn_match(device_t, cfdata_t, void *);
49static void	resetbtn_attach(device_t, device_t, void *);
50
51static int	resetbtn_intr(void *);
52static void	resetbtn_task(void *);
53static void	resetbtn_critpoll(void *);
54
55CFATTACH_DECL_NEW(resetbtn, sizeof(struct sysmon_pswitch),
56	resetbtn_match, resetbtn_attach, NULL, NULL);
57
58static int
59resetbtn_match(device_t parent, cfdata_t cf, void *aux)
60{
61	return !wiiu_plat;
62}
63
64static void
65resetbtn_attach(device_t parent, device_t self, void *aux)
66{
67	struct ahb_attach_args *aaa = aux;
68	struct sysmon_pswitch *smpsw = device_private(self);
69	int error;
70
71	KASSERT(device_unit(self) == 0);
72
73	aprint_naive("\n");
74	aprint_normal(": Reset button\n");
75
76	critpollhook_establish(resetbtn_critpoll, NULL);
77
78	sysmon_task_queue_init();
79
80	smpsw->smpsw_name = device_xname(self);
81	smpsw->smpsw_type = PSWITCH_TYPE_RESET;
82	error = sysmon_pswitch_register(smpsw);
83	if (error != 0) {
84		aprint_error_dev(self,
85		    "unable to register reset button with sysmon: %d\n", error);
86		smpsw = NULL;
87	}
88
89	ahb_intr_establish(aaa->aaa_irq, IPL_HIGH, resetbtn_intr, smpsw,
90	    device_xname(self));
91}
92
93static int
94resetbtn_intr(void *arg)
95{
96	struct sysmon_pswitch *smpsw = arg;
97
98	sysmon_task_queue_sched(0, resetbtn_task, smpsw);
99
100	return 1;
101}
102
103static void
104resetbtn_task(void *arg)
105{
106	struct sysmon_pswitch *smpsw = arg;
107	bool pressed;
108
109	pressed = (in32(PI_INTERRUPT_CAUSE) & RESET_SWITCH_STATE) == 0;
110
111	if (smpsw != NULL) {
112		sysmon_pswitch_event(smpsw,
113		    pressed ? PSWITCH_EVENT_PRESSED : PSWITCH_EVENT_RELEASED);
114	} else if (!pressed) {
115		kern_reboot(0, NULL);
116	}
117}
118
119static void
120resetbtn_critpoll(void *arg)
121{
122	if ((in32(PI_INTERRUPT_CAUSE) & RESET_SWITCH_STATE) == 0) {
123		out32(HW_RESETS, in32(HW_RESETS) & ~RSTBINB);
124	}
125}
126