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 unsigned long blink_timer_timeout;
42static int has_panicked, shutting_down;
43
44static __noreturn void ip32_poweroff(void *data)
45{
46	void (*poweroff_func)(struct platform_device *) =
47		symbol_get(ds1685_rtc_poweroff);
48
49#ifdef CONFIG_MODULES
50	/* If the first __symbol_get failed, our module wasn't loaded. */
51	if (!poweroff_func) {
52		request_module("rtc-ds1685");
53		poweroff_func = symbol_get(ds1685_rtc_poweroff);
54	}
55#endif
56
57	if (!poweroff_func)
58		pr_emerg("RTC not available for power-off.  Spinning forever ...\n");
59	else {
60		(*poweroff_func)((struct platform_device *)data);
61		symbol_put(ds1685_rtc_poweroff);
62	}
63
64	unreachable();
65}
66
67static void ip32_machine_restart(char *cmd) __noreturn;
68static void ip32_machine_restart(char *cmd)
69{
70	msleep(20);
71	crime->control = CRIME_CONTROL_HARD_RESET;
72	unreachable();
73}
74
75static void blink_timeout(struct timer_list *unused)
76{
77	unsigned long led = mace->perif.ctrl.misc ^ MACEISA_LED_RED;
78	mace->perif.ctrl.misc = led;
79	mod_timer(&blink_timer, jiffies + blink_timer_timeout);
80}
81
82static void ip32_machine_halt(void)
83{
84	ip32_poweroff(&ip32_rtc_device);
85}
86
87static void power_timeout(struct timer_list *unused)
88{
89	ip32_poweroff(&ip32_rtc_device);
90}
91
92void ip32_prepare_poweroff(void)
93{
94	if (has_panicked)
95		return;
96
97	if (shutting_down || kill_cad_pid(SIGINT, 1)) {
98		/* No init process or button pressed twice.  */
99		ip32_poweroff(&ip32_rtc_device);
100	}
101
102	shutting_down = 1;
103	blink_timer_timeout = POWERDOWN_FREQ;
104	blink_timeout(&blink_timer);
105
106	timer_setup(&power_timer, power_timeout, 0);
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_timeout = PANIC_FREQ;
125	blink_timeout(&blink_timer);
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	timer_setup(&blink_timer, blink_timeout, 0);
147	atomic_notifier_chain_register(&panic_notifier_list, &panic_block);
148
149	return 0;
150}
151
152subsys_initcall(ip32_reboot_setup);
153