resetbtn.c revision 1.2 
1/* $NetBSD: resetbtn.c,v 1.2 2024/01/23 21:56:07 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 1.2 2024/01/23 21:56:07 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 <dev/sysmon/sysmonvar.h>
39#include <dev/sysmon/sysmon_taskq.h>
40
41#include "hollywood.h"
42
43#define	PI_INTERRUPT_CAUSE	0x0c003000
44#define	 RESET_SWITCH_STATE	__BIT(16)
45
46static int	resetbtn_match(device_t, cfdata_t, void *);
47static void	resetbtn_attach(device_t, device_t, void *);
48
49static int	resetbtn_intr(void *);
50static void	resetbtn_task(void *);
51
52CFATTACH_DECL_NEW(resetbtn, sizeof(struct sysmon_pswitch),
53	resetbtn_match, resetbtn_attach, NULL, NULL);
54
55static int
56resetbtn_match(device_t parent, cfdata_t cf, void *aux)
57{
58	return 1;
59}
60
61static void
62resetbtn_attach(device_t parent, device_t self, void *aux)
63{
64	struct hollywood_attach_args *haa = aux;
65	struct sysmon_pswitch *smpsw = device_private(self);
66	int error;
67
68	KASSERT(device_unit(self) == 0);
69
70	aprint_naive("\n");
71	aprint_normal(": Reset button\n");
72
73	sysmon_task_queue_init();
74
75	smpsw->smpsw_name = device_xname(self);
76	smpsw->smpsw_type = PSWITCH_TYPE_RESET;
77	error = sysmon_pswitch_register(smpsw);
78	if (error != 0) {
79		aprint_error_dev(self,
80		    "unable to register reset button with sysmon: %d\n", error);
81		smpsw = NULL;
82	}
83
84	hollywood_intr_establish(haa->haa_irq, IPL_HIGH, resetbtn_intr, smpsw,
85	    device_xname(self));
86}
87
88static int
89resetbtn_intr(void *arg)
90{
91	struct sysmon_pswitch *smpsw = arg;
92
93	sysmon_task_queue_sched(0, resetbtn_task, smpsw);
94
95	return 1;
96}
97
98static void
99resetbtn_task(void *arg)
100{
101	struct sysmon_pswitch *smpsw = arg;
102	bool pressed;
103
104	pressed = (in32(PI_INTERRUPT_CAUSE) & RESET_SWITCH_STATE) == 0;
105
106	if (smpsw != NULL) {
107		sysmon_pswitch_event(smpsw,
108		    pressed ? PSWITCH_EVENT_PRESSED : PSWITCH_EVENT_RELEASED);
109	} else if (!pressed) {
110		kern_reboot(0, NULL);
111	}
112}
113