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 #include "ip32-common.h"
33
34 #define POWERDOWN_TIMEOUT 120
35 /*
36 * Blink frequency during reboot grace period and when panicked.
37 */
38 #define POWERDOWN_FREQ (HZ / 4)
39 #define PANIC_FREQ (HZ / 8)
40
41 extern struct platform_device ip32_rtc_device;
42
43 static struct timer_list power_timer, blink_timer;
44 static unsigned long blink_timer_timeout;
45 static int has_panicked, shutting_down;
46
47 static __noreturn void ip32_poweroff(void *data)
48 {
49 void (*poweroff_func)(struct platform_device *) =
50 symbol_get(ds1685_rtc_poweroff);
51
52 #ifdef CONFIG_MODULES
53 /* If the first __symbol_get failed, our module wasn't loaded. */
54 if (!poweroff_func) {
55 request_module("rtc-ds1685");
56 poweroff_func = symbol_get(ds1685_rtc_poweroff);
57 }
58 #endif
59
60 if (!poweroff_func)
61 pr_emerg("RTC not available for power-off. Spinning forever ...\n");
62 else {
63 (*poweroff_func)((struct platform_device *)data);
64 symbol_put(ds1685_rtc_poweroff);
65 }
66
67 unreachable();
68 }
69
70 static void ip32_machine_restart(char *cmd) __noreturn;
71 static void ip32_machine_restart(char *cmd)
72 {
73 msleep(20);
74 crime->control = CRIME_CONTROL_HARD_RESET;
75 unreachable();
76 }
77
78 static void blink_timeout(struct timer_list *unused)
79 {
80 unsigned long led = mace->perif.ctrl.misc ^ MACEISA_LED_RED;
81 mace->perif.ctrl.misc = led;
82 mod_timer(&blink_timer, jiffies + blink_timer_timeout);
83 }
84
85 static void ip32_machine_halt(void)
86 {
87 ip32_poweroff(&ip32_rtc_device);
88 }
89
90 static void power_timeout(struct timer_list *unused)
91 {
92 ip32_poweroff(&ip32_rtc_device);
93 }
94
95 void ip32_prepare_poweroff(void)
96 {
97 if (has_panicked)
98 return;
99
100 if (shutting_down || kill_cad_pid(SIGINT, 1)) {
101 /* No init process or button pressed twice. */
102 ip32_poweroff(&ip32_rtc_device);
103 }
104
105 shutting_down = 1;
106 blink_timer_timeout = POWERDOWN_FREQ;
107 blink_timeout(&blink_timer);
108
109 timer_setup(&power_timer, power_timeout, 0);
110 power_timer.expires = jiffies + POWERDOWN_TIMEOUT * HZ;
111 add_timer(&power_timer);
112 }
113
114 static int panic_event(struct notifier_block *this, unsigned long event,
115 void *ptr)
116 {
117 unsigned long led;
118
119 if (has_panicked)
120 return NOTIFY_DONE;
121 has_panicked = 1;
122
123 /* turn off the green LED */
124 led = mace->perif.ctrl.misc | MACEISA_LED_GREEN;
125 mace->perif.ctrl.misc = led;
126
127 blink_timer_timeout = PANIC_FREQ;
128 blink_timeout(&blink_timer);
129
130 return NOTIFY_DONE;
131 }
132
133 static struct notifier_block panic_block = {
134 .notifier_call = panic_event,
135 };
136
137 static __init int ip32_reboot_setup(void)
138 {
139 /* turn on the green led only */
140 unsigned long led = mace->perif.ctrl.misc;
141 led |= MACEISA_LED_RED;
142 led &= ~MACEISA_LED_GREEN;
143 mace->perif.ctrl.misc = led;
144
145 _machine_restart = ip32_machine_restart;
146 _machine_halt = ip32_machine_halt;
147 pm_power_off = ip32_machine_halt;
148
149 timer_setup(&blink_timer, blink_timeout, 0);
150 atomic_notifier_chain_register(&panic_notifier_list, &panic_block);
151
152 return 0;
153 }
154
155 subsys_initcall(ip32_reboot_setup);
156
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