summaryrefslogtreecommitdiff
path: root/arch/mips/sgi-ip32/ip32-reset.c
blob: 6bdc1421cda46cad28b5b253bf53703005ed09bf (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2001 Keith M Wesolowski
 * Copyright (C) 2001 Paul Mundt
 * Copyright (C) 2003 Guido Guenther <agx@sigxcpu.org>
 */

#include <linux/compiler.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/panic_notifier.h>
#include <linux/sched.h>
#include <linux/sched/signal.h>
#include <linux/notifier.h>
#include <linux/delay.h>
#include <linux/rtc/ds1685.h>
#include <linux/interrupt.h>
#include <linux/pm.h>

#include <asm/addrspace.h>
#include <asm/irq.h>
#include <asm/reboot.h>
#include <asm/wbflush.h>
#include <asm/ip32/mace.h>
#include <asm/ip32/crime.h>
#include <asm/ip32/ip32_ints.h>

#include "ip32-common.h"

#define POWERDOWN_TIMEOUT	120
/*
 * Blink frequency during reboot grace period and when panicked.
 */
#define POWERDOWN_FREQ		(HZ / 4)
#define PANIC_FREQ		(HZ / 8)

extern struct platform_device ip32_rtc_device;

static struct timer_list power_timer, blink_timer;
static unsigned long blink_timer_timeout;
static int has_panicked, shutting_down;

static __noreturn void ip32_poweroff(void *data)
{
	void (*poweroff_func)(struct platform_device *) =
		symbol_get(ds1685_rtc_poweroff);

#ifdef CONFIG_MODULES
	/* If the first __symbol_get failed, our module wasn't loaded. */
	if (!poweroff_func) {
		request_module("rtc-ds1685");
		poweroff_func = symbol_get(ds1685_rtc_poweroff);
	}
#endif

	if (!poweroff_func)
		pr_emerg("RTC not available for power-off.  Spinning forever ...\n");
	else {
		(*poweroff_func)((struct platform_device *)data);
		symbol_put(ds1685_rtc_poweroff);
	}

	unreachable();
}

static void ip32_machine_restart(char *cmd) __noreturn;
static void ip32_machine_restart(char *cmd)
{
	msleep(20);
	crime->control = CRIME_CONTROL_HARD_RESET;
	unreachable();
}

static void blink_timeout(struct timer_list *unused)
{
	unsigned long led = mace->perif.ctrl.misc ^ MACEISA_LED_RED;
	mace->perif.ctrl.misc = led;
	mod_timer(&blink_timer, jiffies + blink_timer_timeout);
}

static void ip32_machine_halt(void)
{
	ip32_poweroff(&ip32_rtc_device);
}

static void power_timeout(struct timer_list *unused)
{
	ip32_poweroff(&ip32_rtc_device);
}

void ip32_prepare_poweroff(void)
{
	if (has_panicked)
		return;

	if (shutting_down || kill_cad_pid(SIGINT, 1)) {
		/* No init process or button pressed twice.  */
		ip32_poweroff(&ip32_rtc_device);
	}

	shutting_down = 1;
	blink_timer_timeout = POWERDOWN_FREQ;
	blink_timeout(&blink_timer);

	timer_setup(&power_timer, power_timeout, 0);
	power_timer.expires = jiffies + POWERDOWN_TIMEOUT * HZ;
	add_timer(&power_timer);
}

static int panic_event(struct notifier_block *this, unsigned long event,
		       void *ptr)
{
	unsigned long led;

	if (has_panicked)
		return NOTIFY_DONE;
	has_panicked = 1;

	/* turn off the green LED */
	led = mace->perif.ctrl.misc | MACEISA_LED_GREEN;
	mace->perif.ctrl.misc = led;

	blink_timer_timeout = PANIC_FREQ;
	blink_timeout(&blink_timer);

	return NOTIFY_DONE;
}

static struct notifier_block panic_block = {
	.notifier_call = panic_event,
};

static __init int ip32_reboot_setup(void)
{
	/* turn on the green led only */
	unsigned long led = mace->perif.ctrl.misc;
	led |= MACEISA_LED_RED;
	led &= ~MACEISA_LED_GREEN;
	mace->perif.ctrl.misc = led;

	_machine_restart = ip32_machine_restart;
	_machine_halt = ip32_machine_halt;
	pm_power_off = ip32_machine_halt;

	timer_setup(&blink_timer, blink_timeout, 0);
	atomic_notifier_chain_register(&panic_notifier_list, &panic_block);

	return 0;
}

subsys_initcall(ip32_reboot_setup);