aboutsummaryrefslogtreecommitdiffstats
path: root/arch/mips/sgi-ip22/ip22-reset.c
blob: 45b6694c20796de82d14a15d79c34ee52d54c55a (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
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
/*
 * 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) 1997, 1998, 2001, 03, 05, 06 by Ralf Baechle
 */
#include <linux/linkage.h>
#include <linux/init.h>
#include <linux/ds1286.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/notifier.h>
#include <linux/pm.h>
#include <linux/timer.h>

#include <asm/io.h>
#include <asm/irq.h>
#include <asm/system.h>
#include <asm/reboot.h>
#include <asm/sgialib.h>
#include <asm/sgi/ioc.h>
#include <asm/sgi/hpc3.h>
#include <asm/sgi/mc.h>
#include <asm/sgi/ip22.h>

/*
 * Just powerdown if init hasn't done after POWERDOWN_TIMEOUT seconds.
 * I'm not sure if this feature is a good idea, for now it's here just to
 * make the power button make behave just like under IRIX.
 */
#define POWERDOWN_TIMEOUT	120

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

static struct timer_list power_timer, blink_timer, debounce_timer;

#define MACHINE_PANICED		1
#define MACHINE_SHUTTING_DOWN	2

static int machine_state;

static void __noreturn sgi_machine_power_off(void)
{
	unsigned int tmp;

	local_irq_disable();

	/* Disable watchdog */
	tmp = hpc3c0->rtcregs[RTC_CMD] & 0xff;
	hpc3c0->rtcregs[RTC_CMD] = tmp | RTC_WAM;
	hpc3c0->rtcregs[RTC_WSEC] = 0;
	hpc3c0->rtcregs[RTC_WHSEC] = 0;

	while (1) {
		sgioc->panel = ~SGIOC_PANEL_POWERON;
		/* Good bye cruel world ...  */

		/* If we're still running, we probably got sent an alarm
		   interrupt.  Read the flag to clear it.  */
		tmp = hpc3c0->rtcregs[RTC_HOURS_ALARM];
	}
}

static void __noreturn sgi_machine_restart(char *command)
{
	if (machine_state & MACHINE_SHUTTING_DOWN)
		sgi_machine_power_off();
	sgimc->cpuctrl0 |= SGIMC_CCTRL0_SYSINIT;
	while (1);
}

static void __noreturn sgi_machine_halt(void)
{
	if (machine_state & MACHINE_SHUTTING_DOWN)
		sgi_machine_power_off();
	ArcEnterInteractiveMode();
}

static void power_timeout(unsigned long data)
{
	sgi_machine_power_off();
}

static void blink_timeout(unsigned long data)
{
	/* XXX fix this for fullhouse  */
	sgi_ioc_reset ^= (SGIOC_RESET_LC0OFF|SGIOC_RESET_LC1OFF);
	sgioc->reset = sgi_ioc_reset;

	mod_timer(&blink_timer, jiffies + data);
}

static void debounce(unsigned long data)
{
	del_timer(&debounce_timer);
	if (sgint->istat1 & SGINT_ISTAT1_PWR) {
		/* Interrupt still being sent. */
		debounce_timer.expires = jiffies + (HZ / 20); /* 0.05s  */
		add_timer(&debounce_timer);

		sgioc->panel = SGIOC_PANEL_POWERON | SGIOC_PANEL_POWERINTR |
			       SGIOC_PANEL_VOLDNINTR | SGIOC_PANEL_VOLDNHOLD |
			       SGIOC_PANEL_VOLUPINTR | SGIOC_PANEL_VOLUPHOLD;

		return;
	}

	if (machine_state & MACHINE_PANICED)
		sgimc->cpuctrl0 |= SGIMC_CCTRL0_SYSINIT;

	enable_irq(SGI_PANEL_IRQ);
}

static inline void power_button(void)
{
	if (machine_state & MACHINE_PANICED)
		return;

	if ((machine_state & MACHINE_SHUTTING_DOWN) ||
			kill_cad_pid(SIGINT, 1)) {
		/* No init process or button pressed twice.  */
		sgi_machine_power_off();
	}

	machine_state |= MACHINE_SHUTTING_DOWN;
	blink_timer.data = POWERDOWN_FREQ;
	blink_timeout(POWERDOWN_FREQ);

	init_timer(&power_timer);
	power_timer.function = power_timeout;
	power_timer.expires = jiffies + POWERDOWN_TIMEOUT * HZ;
	add_timer(&power_timer);
}

static irqreturn_t panel_int(int irq, void *dev_id)
{
	unsigned int buttons;

	buttons = sgioc->panel;
	sgioc->panel = SGIOC_PANEL_POWERON | SGIOC_PANEL_POWERINTR;

	if (sgint->istat1 & SGINT_ISTAT1_PWR) {
		/* Wait until interrupt goes away */
		disable_irq_nosync(SGI_PANEL_IRQ);
		init_timer(&debounce_timer);
		debounce_timer.function = debounce;
		debounce_timer.expires = jiffies + 5;
		add_timer(&debounce_timer);
	}

	/* Power button was pressed
	 * ioc.ps page 22: "The Panel Register is called Power Control by Full
	 * House. Only lowest 2 bits are used. Guiness uses upper four bits
	 * for volume control". This is not true, all bits are pulled high
	 * on fullhouse */
	if (!(buttons & SGIOC_PANEL_POWERINTR))
		power_button();

	return IRQ_HANDLED;
}

static int panic_event(struct notifier_block *this, unsigned long event,
                      void *ptr)
{
	if (machine_state & MACHINE_PANICED)
		return NOTIFY_DONE;
	machine_state |= MACHINE_PANICED;

	blink_timer.data = PANIC_FREQ;
	blink_timeout(PANIC_FREQ);

	return NOTIFY_DONE;
}

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

static int __init reboot_setup(void)
{
	int res;

	_machine_restart = sgi_machine_restart;
	_machine_halt = sgi_machine_halt;
	pm_power_off = sgi_machine_power_off;

	res = request_irq(SGI_PANEL_IRQ, panel_int, 0, "Front Panel", NULL);
	if (res) {
		printk(KERN_ERR "Allocation of front panel IRQ failed\n");
		return res;
	}

	init_timer(&blink_timer);
	blink_timer.function = blink_timeout;
	atomic_notifier_chain_register(&panic_notifier_list, &panic_block);

	return 0;
}

subsys_initcall(reboot_setup);

Privacy Policy