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203 lines
4.9 KiB
203 lines
4.9 KiB
/* |
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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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