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
46 static int resetbtn_match(device_t, cfdata_t, void *);
47 static void resetbtn_attach(device_t, device_t, void *);
48
49 static int resetbtn_intr(void *);
50 static void resetbtn_task(void *);
51
52 CFATTACH_DECL_NEW(resetbtn, sizeof(struct sysmon_pswitch),
53 resetbtn_match, resetbtn_attach, NULL, NULL);
54
55 static int
resetbtn_match(device_t parent,cfdata_t cf,void * aux)56 resetbtn_match(device_t parent, cfdata_t cf, void *aux)
57 {
58 return 1;
59 }
60
61 static void
resetbtn_attach(device_t parent,device_t self,void * aux)62 resetbtn_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
88 static int
resetbtn_intr(void * arg)89 resetbtn_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
98 static void
resetbtn_task(void * arg)99 resetbtn_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