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a66b899dfb
In preparation for unconditionally passing the struct timer_list pointer to all timer callbacks, switch to using the new timer_setup() and from_timer() to pass the timer pointer explicitly. Adds a static variable to hold timeout value. Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Paul Gortmaker <paul.gortmaker@windriver.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: James Hogan <james.hogan@imgtec.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: linux-mips@linux-mips.org Signed-off-by: Kees Cook <keescook@chromium.org>
204 lines
4.9 KiB
C
204 lines
4.9 KiB
C
/*
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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) 1997, 1998, 2001, 03, 05, 06 by Ralf Baechle
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*/
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#include <linux/linkage.h>
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#include <linux/init.h>
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#include <linux/rtc/ds1286.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/sched/signal.h>
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#include <linux/notifier.h>
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#include <linux/pm.h>
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#include <linux/timer.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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#include <asm/reboot.h>
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#include <asm/sgialib.h>
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#include <asm/sgi/ioc.h>
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#include <asm/sgi/hpc3.h>
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#include <asm/sgi/mc.h>
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#include <asm/sgi/ip22.h>
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/*
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* Just powerdown if init hasn't done after POWERDOWN_TIMEOUT seconds.
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* I'm not sure if this feature is a good idea, for now it's here just to
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* make the power button make behave just like under IRIX.
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*/
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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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static struct timer_list power_timer, blink_timer, debounce_timer;
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static unsigned long blink_timer_timeout;
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#define MACHINE_PANICED 1
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#define MACHINE_SHUTTING_DOWN 2
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static int machine_state;
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static void __noreturn sgi_machine_power_off(void)
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{
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unsigned int tmp;
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local_irq_disable();
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/* Disable watchdog */
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tmp = hpc3c0->rtcregs[RTC_CMD] & 0xff;
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hpc3c0->rtcregs[RTC_CMD] = tmp | RTC_WAM;
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hpc3c0->rtcregs[RTC_WSEC] = 0;
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hpc3c0->rtcregs[RTC_WHSEC] = 0;
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while (1) {
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sgioc->panel = ~SGIOC_PANEL_POWERON;
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/* Good bye cruel world ... */
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/* If we're still running, we probably got sent an alarm
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interrupt. Read the flag to clear it. */
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tmp = hpc3c0->rtcregs[RTC_HOURS_ALARM];
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}
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}
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static void __noreturn sgi_machine_restart(char *command)
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{
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if (machine_state & MACHINE_SHUTTING_DOWN)
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sgi_machine_power_off();
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sgimc->cpuctrl0 |= SGIMC_CCTRL0_SYSINIT;
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while (1);
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}
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static void __noreturn sgi_machine_halt(void)
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{
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if (machine_state & MACHINE_SHUTTING_DOWN)
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sgi_machine_power_off();
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ArcEnterInteractiveMode();
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}
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static void power_timeout(struct timer_list *unused)
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{
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sgi_machine_power_off();
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}
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static void blink_timeout(struct timer_list *unused)
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{
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/* XXX fix this for fullhouse */
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sgi_ioc_reset ^= (SGIOC_RESET_LC0OFF|SGIOC_RESET_LC1OFF);
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sgioc->reset = sgi_ioc_reset;
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mod_timer(&blink_timer, jiffies + blink_timer_timeout);
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}
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static void debounce(struct timer_list *unused)
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{
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del_timer(&debounce_timer);
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if (sgint->istat1 & SGINT_ISTAT1_PWR) {
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/* Interrupt still being sent. */
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debounce_timer.expires = jiffies + (HZ / 20); /* 0.05s */
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add_timer(&debounce_timer);
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sgioc->panel = SGIOC_PANEL_POWERON | SGIOC_PANEL_POWERINTR |
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SGIOC_PANEL_VOLDNINTR | SGIOC_PANEL_VOLDNHOLD |
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SGIOC_PANEL_VOLUPINTR | SGIOC_PANEL_VOLUPHOLD;
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return;
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}
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if (machine_state & MACHINE_PANICED)
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sgimc->cpuctrl0 |= SGIMC_CCTRL0_SYSINIT;
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enable_irq(SGI_PANEL_IRQ);
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}
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static inline void power_button(void)
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{
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if (machine_state & MACHINE_PANICED)
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return;
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if ((machine_state & MACHINE_SHUTTING_DOWN) ||
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kill_cad_pid(SIGINT, 1)) {
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/* No init process or button pressed twice. */
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sgi_machine_power_off();
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}
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machine_state |= MACHINE_SHUTTING_DOWN;
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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 irqreturn_t panel_int(int irq, void *dev_id)
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{
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unsigned int buttons;
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buttons = sgioc->panel;
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sgioc->panel = SGIOC_PANEL_POWERON | SGIOC_PANEL_POWERINTR;
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if (sgint->istat1 & SGINT_ISTAT1_PWR) {
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/* Wait until interrupt goes away */
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disable_irq_nosync(SGI_PANEL_IRQ);
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timer_setup(&debounce_timer, debounce, 0);
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debounce_timer.expires = jiffies + 5;
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add_timer(&debounce_timer);
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}
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/* Power button was pressed
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* ioc.ps page 22: "The Panel Register is called Power Control by Full
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* House. Only lowest 2 bits are used. Guiness uses upper four bits
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* for volume control". This is not true, all bits are pulled high
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* on fullhouse */
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if (!(buttons & SGIOC_PANEL_POWERINTR))
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power_button();
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return IRQ_HANDLED;
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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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if (machine_state & MACHINE_PANICED)
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return NOTIFY_DONE;
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machine_state |= MACHINE_PANICED;
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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 int __init reboot_setup(void)
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{
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int res;
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_machine_restart = sgi_machine_restart;
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_machine_halt = sgi_machine_halt;
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pm_power_off = sgi_machine_power_off;
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res = request_irq(SGI_PANEL_IRQ, panel_int, 0, "Front Panel", NULL);
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if (res) {
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printk(KERN_ERR "Allocation of front panel IRQ failed\n");
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return res;
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}
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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(reboot_setup);
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