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/panic_notifier.h>
16#include <linux/sched.h>
17#include <linux/sched/signal.h>
18#include <linux/notifier.h>
19#include <linux/delay.h>
20#include <linux/rtc/ds1685.h>
21#include <linux/interrupt.h>
22#include <linux/pm.h>
23
24#include <asm/addrspace.h>
25#include <asm/irq.h>
26#include <asm/reboot.h>
27#include <asm/wbflush.h>
28#include <asm/ip32/mace.h>
29#include <asm/ip32/crime.h>
30#include <asm/ip32/ip32_ints.h>
31
32#define POWERDOWN_TIMEOUT	120
33/*
34 * Blink frequency during reboot grace period and when panicked.
35 */
36#define POWERDOWN_FREQ		(HZ / 4)
37#define PANIC_FREQ		(HZ / 8)
38
39extern struct platform_device ip32_rtc_device;
40
41static struct timer_list power_timer, blink_timer;
42static unsigned long blink_timer_timeout;
43static int has_panicked, shutting_down;
44
45static __noreturn void ip32_poweroff(void *data)
46{
47	void (*poweroff_func)(struct platform_device *) =
48		symbol_get(ds1685_rtc_poweroff);
49
50#ifdef CONFIG_MODULES
51	/* If the first __symbol_get failed, our module wasn't loaded. */
52	if (!poweroff_func) {
53		request_module("rtc-ds1685");
54		poweroff_func = symbol_get(ds1685_rtc_poweroff);
55	}
56#endif
57
58	if (!poweroff_func)
59		pr_emerg("RTC not available for power-off.  Spinning forever ...\n");
60	else {
61		(*poweroff_func)((struct platform_device *)data);
62		symbol_put(ds1685_rtc_poweroff);
63	}
64
65	unreachable();
66}
67
68static void ip32_machine_restart(char *cmd) __noreturn;
69static void ip32_machine_restart(char *cmd)
70{
71	msleep(20);
72	crime->control = CRIME_CONTROL_HARD_RESET;
73	unreachable();
74}
75
76static void blink_timeout(struct timer_list *unused)
77{
78	unsigned long led = mace->perif.ctrl.misc ^ MACEISA_LED_RED;
79	mace->perif.ctrl.misc = led;
80	mod_timer(&blink_timer, jiffies + blink_timer_timeout);
81}
82
83static void ip32_machine_halt(void)
84{
85	ip32_poweroff(&ip32_rtc_device);
86}
87
88static void power_timeout(struct timer_list *unused)
89{
90	ip32_poweroff(&ip32_rtc_device);
91}
92
93void ip32_prepare_poweroff(void)
94{
95	if (has_panicked)
96		return;
97
98	if (shutting_down || kill_cad_pid(SIGINT, 1)) {
99		/* No init process or button pressed twice.  */
100		ip32_poweroff(&ip32_rtc_device);
101	}
102
103	shutting_down = 1;
104	blink_timer_timeout = POWERDOWN_FREQ;
105	blink_timeout(&blink_timer);
106
107	timer_setup(&power_timer, power_timeout, 0);
108	power_timer.expires = jiffies + POWERDOWN_TIMEOUT * HZ;
109	add_timer(&power_timer);
110}
111
112static int panic_event(struct notifier_block *this, unsigned long event,
113		       void *ptr)
114{
115	unsigned long led;
116
117	if (has_panicked)
118		return NOTIFY_DONE;
119	has_panicked = 1;
120
121	/* turn off the green LED */
122	led = mace->perif.ctrl.misc | MACEISA_LED_GREEN;
123	mace->perif.ctrl.misc = led;
124
125	blink_timer_timeout = PANIC_FREQ;
126	blink_timeout(&blink_timer);
127
128	return NOTIFY_DONE;
129}
130
131static struct notifier_block panic_block = {
132	.notifier_call = panic_event,
133};
134
135static __init int ip32_reboot_setup(void)
136{
137	/* turn on the green led only */
138	unsigned long led = mace->perif.ctrl.misc;
139	led |= MACEISA_LED_RED;
140	led &= ~MACEISA_LED_GREEN;
141	mace->perif.ctrl.misc = led;
142
143	_machine_restart = ip32_machine_restart;
144	_machine_halt = ip32_machine_halt;
145	pm_power_off = ip32_machine_halt;
146
147	timer_setup(&blink_timer, blink_timeout, 0);
148	atomic_notifier_chain_register(&panic_notifier_list, &panic_block);
149
150	return 0;
151}
152
153subsys_initcall(ip32_reboot_setup);
154