153 lines
3.5 KiB
C
153 lines
3.5 KiB
C
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/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2001 Keith M Wesolowski
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* Copyright (C) 2001 Paul Mundt
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* Copyright (C) 2003 Guido Guenther <agx@sigxcpu.org>
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*/
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#include <linux/compiler.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/sched/signal.h>
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#include <linux/notifier.h>
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#include <linux/delay.h>
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#include <linux/rtc/ds1685.h>
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#include <linux/interrupt.h>
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#include <linux/pm.h>
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#include <asm/addrspace.h>
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#include <asm/irq.h>
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#include <asm/reboot.h>
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#include <asm/wbflush.h>
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#include <asm/ip32/mace.h>
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#include <asm/ip32/crime.h>
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#include <asm/ip32/ip32_ints.h>
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#define POWERDOWN_TIMEOUT 120
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/*
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* Blink frequency during reboot grace period and when panicked.
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*/
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#define POWERDOWN_FREQ (HZ / 4)
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#define PANIC_FREQ (HZ / 8)
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extern struct platform_device ip32_rtc_device;
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static struct timer_list power_timer, blink_timer;
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static unsigned long blink_timer_timeout;
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static int has_panicked, shutting_down;
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static __noreturn void ip32_poweroff(void *data)
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{
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void (*poweroff_func)(struct platform_device *) =
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symbol_get(ds1685_rtc_poweroff);
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#ifdef CONFIG_MODULES
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/* If the first __symbol_get failed, our module wasn't loaded. */
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if (!poweroff_func) {
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request_module("rtc-ds1685");
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poweroff_func = symbol_get(ds1685_rtc_poweroff);
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}
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#endif
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if (!poweroff_func)
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pr_emerg("RTC not available for power-off. Spinning forever ...\n");
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else {
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(*poweroff_func)((struct platform_device *)data);
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symbol_put(ds1685_rtc_poweroff);
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}
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unreachable();
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}
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static void ip32_machine_restart(char *cmd) __noreturn;
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static void ip32_machine_restart(char *cmd)
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{
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msleep(20);
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crime->control = CRIME_CONTROL_HARD_RESET;
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unreachable();
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}
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static void blink_timeout(struct timer_list *unused)
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{
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unsigned long led = mace->perif.ctrl.misc ^ MACEISA_LED_RED;
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mace->perif.ctrl.misc = led;
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mod_timer(&blink_timer, jiffies + blink_timer_timeout);
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}
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static void ip32_machine_halt(void)
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{
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ip32_poweroff(&ip32_rtc_device);
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}
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static void power_timeout(struct timer_list *unused)
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{
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ip32_poweroff(&ip32_rtc_device);
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}
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void ip32_prepare_poweroff(void)
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{
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if (has_panicked)
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return;
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if (shutting_down || kill_cad_pid(SIGINT, 1)) {
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/* No init process or button pressed twice. */
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ip32_poweroff(&ip32_rtc_device);
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}
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shutting_down = 1;
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blink_timer_timeout = POWERDOWN_FREQ;
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blink_timeout(&blink_timer);
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timer_setup(&power_timer, power_timeout, 0);
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power_timer.expires = jiffies + POWERDOWN_TIMEOUT * HZ;
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add_timer(&power_timer);
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}
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static int panic_event(struct notifier_block *this, unsigned long event,
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void *ptr)
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{
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unsigned long led;
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if (has_panicked)
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return NOTIFY_DONE;
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has_panicked = 1;
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/* turn off the green LED */
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led = mace->perif.ctrl.misc | MACEISA_LED_GREEN;
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mace->perif.ctrl.misc = led;
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blink_timer_timeout = PANIC_FREQ;
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blink_timeout(&blink_timer);
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return NOTIFY_DONE;
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}
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static struct notifier_block panic_block = {
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.notifier_call = panic_event,
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};
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static __init int ip32_reboot_setup(void)
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{
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/* turn on the green led only */
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unsigned long led = mace->perif.ctrl.misc;
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led |= MACEISA_LED_RED;
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led &= ~MACEISA_LED_GREEN;
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mace->perif.ctrl.misc = led;
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_machine_restart = ip32_machine_restart;
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_machine_halt = ip32_machine_halt;
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pm_power_off = ip32_machine_halt;
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timer_setup(&blink_timer, blink_timeout, 0);
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atomic_notifier_chain_register(&panic_notifier_list, &panic_block);
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return 0;
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}
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subsys_initcall(ip32_reboot_setup);
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