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