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192.168.1.100 / T103 / 1f884588077ad3476b9c91cbb0ee9ee0332bbb68 / . / src / kernel / linux / v4.14 / arch / mips / sgi-ip32 / ip32-reset.c
blob: b3b442def42383794289c6c07ea9a44ee5c4a873 [file] [log] [blame]
rjw1f884582022-01-06 17:20:42 +0800[diff] [blame^]1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 2001 Keith M Wesolowski
7 * Copyright (C) 2001 Paul Mundt
8 * Copyright (C) 2003 Guido Guenther <agx@sigxcpu.org>
9 */
10
11#include <linux/compiler.h>
12#include <linux/init.h>
13#include <linux/kernel.h>
14#include <linux/module.h>
15#include <linux/sched.h>
16#include <linux/sched/signal.h>
17#include <linux/notifier.h>
18#include <linux/delay.h>
19#include <linux/rtc/ds1685.h>
20#include <linux/interrupt.h>
21#include <linux/pm.h>
22
23#include <asm/addrspace.h>
24#include <asm/irq.h>
25#include <asm/reboot.h>
26#include <asm/wbflush.h>
27#include <asm/ip32/mace.h>
28#include <asm/ip32/crime.h>
29#include <asm/ip32/ip32_ints.h>
30
31#define POWERDOWN_TIMEOUT 120
32/*
33 * Blink frequency during reboot grace period and when panicked.
34 */
35#define POWERDOWN_FREQ (HZ / 4)
36#define PANIC_FREQ (HZ / 8)
37
38extern struct platform_device ip32_rtc_device;
39
40static struct timer_list power_timer, blink_timer;
41static int has_panicked, shutting_down;
42
43static __noreturn void ip32_poweroff(void *data)
44{
45 void (*poweroff_func)(struct platform_device *) =
46 symbol_get(ds1685_rtc_poweroff);
47
48#ifdef CONFIG_MODULES
49 /* If the first __symbol_get failed, our module wasn't loaded. */
50 if (!poweroff_func) {
51 request_module("rtc-ds1685");
52 poweroff_func = symbol_get(ds1685_rtc_poweroff);
53 }
54#endif
55
56 if (!poweroff_func)
57 pr_emerg("RTC not available for power-off. Spinning forever ...\n");
58 else {
59 (*poweroff_func)((struct platform_device *)data);
60 symbol_put(ds1685_rtc_poweroff);
61 }
62
63 unreachable();
64}
65
66static void ip32_machine_restart(char *cmd) __noreturn;
67static void ip32_machine_restart(char *cmd)
68{
69 msleep(20);
70 crime->control = CRIME_CONTROL_HARD_RESET;
71 unreachable();
72}
73
74static void blink_timeout(unsigned long data)
75{
76 unsigned long led = mace->perif.ctrl.misc ^ MACEISA_LED_RED;
77 mace->perif.ctrl.misc = led;
78 mod_timer(&blink_timer, jiffies + data);
79}
80
81static void ip32_machine_halt(void)
82{
83 ip32_poweroff(&ip32_rtc_device);
84}
85
86static void power_timeout(unsigned long data)
87{
88 ip32_poweroff(&ip32_rtc_device);
89}
90
91void ip32_prepare_poweroff(void)
92{
93 if (has_panicked)
94 return;
95
96 if (shutting_down || kill_cad_pid(SIGINT, 1)) {
97 /* No init process or button pressed twice. */
98 ip32_poweroff(&ip32_rtc_device);
99 }
100
101 shutting_down = 1;
102 blink_timer.data = POWERDOWN_FREQ;
103 blink_timeout(POWERDOWN_FREQ);
104
105 init_timer(&power_timer);
106 power_timer.function = power_timeout;
107 power_timer.expires = jiffies + POWERDOWN_TIMEOUT * HZ;
108 add_timer(&power_timer);
109}
110
111static int panic_event(struct notifier_block *this, unsigned long event,
112 void *ptr)
113{
114 unsigned long led;
115
116 if (has_panicked)
117 return NOTIFY_DONE;
118 has_panicked = 1;
119
120 /* turn off the green LED */
121 led = mace->perif.ctrl.misc | MACEISA_LED_GREEN;
122 mace->perif.ctrl.misc = led;
123
124 blink_timer.data = PANIC_FREQ;
125 blink_timeout(PANIC_FREQ);
126
127 return NOTIFY_DONE;
128}
129
130static struct notifier_block panic_block = {
131 .notifier_call = panic_event,
132};
133
134static __init int ip32_reboot_setup(void)
135{
136 /* turn on the green led only */
137 unsigned long led = mace->perif.ctrl.misc;
138 led |= MACEISA_LED_RED;
139 led &= ~MACEISA_LED_GREEN;
140 mace->perif.ctrl.misc = led;
141
142 _machine_restart = ip32_machine_restart;
143 _machine_halt = ip32_machine_halt;
144 pm_power_off = ip32_machine_halt;
145
146 init_timer(&blink_timer);
147 blink_timer.function = blink_timeout;
148 atomic_notifier_chain_register(&panic_notifier_list, &panic_block);
149
150 return 0;
151}
152
153subsys_initcall(ip32_reboot_setup);