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
6 * Copyright (C) 2001 Keith M Wesolowski
7 * Copyright (C) 2001 Paul Mundt
8 * Copyright (C) 2003 Guido Guenther <agx@sigxcpu.org>
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>
23 #include <asm/addrspace.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>
31 #define POWERDOWN_TIMEOUT 120
33 * Blink frequency during reboot grace period and when panicked.
35 #define POWERDOWN_FREQ (HZ / 4)
36 #define PANIC_FREQ (HZ / 8)
38 extern struct platform_device ip32_rtc_device;
40 static struct timer_list power_timer, blink_timer;
41 static int has_panicked, shutting_down;
43 static __noreturn void ip32_poweroff(void *data)
45 void (*poweroff_func)(struct platform_device *) =
46 symbol_get(ds1685_rtc_poweroff);
49 /* If the first __symbol_get failed, our module wasn't loaded. */
51 request_module("rtc-ds1685");
52 poweroff_func = symbol_get(ds1685_rtc_poweroff);
57 pr_emerg("RTC not available for power-off. Spinning forever ...\n");
59 (*poweroff_func)((struct platform_device *)data);
60 symbol_put(ds1685_rtc_poweroff);
66 static void ip32_machine_restart(char *cmd) __noreturn;
67 static void ip32_machine_restart(char *cmd)
70 crime->control = CRIME_CONTROL_HARD_RESET;
74 static void blink_timeout(unsigned long data)
76 unsigned long led = mace->perif.ctrl.misc ^ MACEISA_LED_RED;
77 mace->perif.ctrl.misc = led;
78 mod_timer(&blink_timer, jiffies + data);
81 static void ip32_machine_halt(void)
83 ip32_poweroff(&ip32_rtc_device);
86 static void power_timeout(unsigned long data)
88 ip32_poweroff(&ip32_rtc_device);
91 void ip32_prepare_poweroff(void)
96 if (shutting_down || kill_cad_pid(SIGINT, 1)) {
97 /* No init process or button pressed twice. */
98 ip32_poweroff(&ip32_rtc_device);
102 blink_timer.data = POWERDOWN_FREQ;
103 blink_timeout(POWERDOWN_FREQ);
105 init_timer(&power_timer);
106 power_timer.function = power_timeout;
107 power_timer.expires = jiffies + POWERDOWN_TIMEOUT * HZ;
108 add_timer(&power_timer);
111 static int panic_event(struct notifier_block *this, unsigned long event,
120 /* turn off the green LED */
121 led = mace->perif.ctrl.misc | MACEISA_LED_GREEN;
122 mace->perif.ctrl.misc = led;
124 blink_timer.data = PANIC_FREQ;
125 blink_timeout(PANIC_FREQ);
130 static struct notifier_block panic_block = {
131 .notifier_call = panic_event,
134 static __init int ip32_reboot_setup(void)
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;
142 _machine_restart = ip32_machine_restart;
143 _machine_halt = ip32_machine_halt;
144 pm_power_off = ip32_machine_halt;
146 init_timer(&blink_timer);
147 blink_timer.function = blink_timeout;
148 atomic_notifier_chain_register(&panic_notifier_list, &panic_block);
153 subsys_initcall(ip32_reboot_setup);