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arch/mips/sgi-ip22/ip22-reset.c
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/* * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * |
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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> #include <linux/ds1286.h> #include <linux/module.h> #include <linux/interrupt.h> #include <linux/kernel.h> #include <linux/sched.h> #include <linux/notifier.h> |
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#include <linux/pm.h> |
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#include <linux/timer.h> #include <asm/io.h> #include <asm/irq.h> #include <asm/system.h> #include <asm/reboot.h> #include <asm/sgialib.h> #include <asm/sgi/ioc.h> #include <asm/sgi/hpc3.h> #include <asm/sgi/mc.h> #include <asm/sgi/ip22.h> /* * Just powerdown if init hasn't done after POWERDOWN_TIMEOUT seconds. * I'm not sure if this feature is a good idea, for now it's here just to * make the power button make behave just like under IRIX. */ #define POWERDOWN_TIMEOUT 120 /* |
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* Blink frequency during reboot grace period and when panicked. |
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*/ #define POWERDOWN_FREQ (HZ / 4) #define PANIC_FREQ (HZ / 8) |
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static struct timer_list power_timer, blink_timer, debounce_timer; |
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#define MACHINE_PANICED 1 #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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{ unsigned int tmp; local_irq_disable(); /* Disable watchdog */ tmp = hpc3c0->rtcregs[RTC_CMD] & 0xff; hpc3c0->rtcregs[RTC_CMD] = tmp | RTC_WAM; hpc3c0->rtcregs[RTC_WSEC] = 0; hpc3c0->rtcregs[RTC_WHSEC] = 0; while (1) { sgioc->panel = ~SGIOC_PANEL_POWERON; /* Good bye cruel world ... */ /* If we're still running, we probably got sent an alarm interrupt. Read the flag to clear it. */ tmp = hpc3c0->rtcregs[RTC_HOURS_ALARM]; } } |
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static void __noreturn sgi_machine_restart(char *command) |
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{ if (machine_state & MACHINE_SHUTTING_DOWN) sgi_machine_power_off(); sgimc->cpuctrl0 |= SGIMC_CCTRL0_SYSINIT; while (1); } |
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static void __noreturn sgi_machine_halt(void) |
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{ if (machine_state & MACHINE_SHUTTING_DOWN) sgi_machine_power_off(); ArcEnterInteractiveMode(); } |
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static void power_timeout(unsigned long data) { sgi_machine_power_off(); } static void blink_timeout(unsigned long data) { /* XXX fix this for fullhouse */ sgi_ioc_reset ^= (SGIOC_RESET_LC0OFF|SGIOC_RESET_LC1OFF); sgioc->reset = sgi_ioc_reset; |
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mod_timer(&blink_timer, jiffies + data); |
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} static void debounce(unsigned long data) { del_timer(&debounce_timer); if (sgint->istat1 & SGINT_ISTAT1_PWR) { /* Interrupt still being sent. */ |
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debounce_timer.expires = jiffies + (HZ / 20); /* 0.05s */ |
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add_timer(&debounce_timer); sgioc->panel = SGIOC_PANEL_POWERON | SGIOC_PANEL_POWERINTR | SGIOC_PANEL_VOLDNINTR | SGIOC_PANEL_VOLDNHOLD | SGIOC_PANEL_VOLUPINTR | SGIOC_PANEL_VOLUPHOLD; return; } if (machine_state & MACHINE_PANICED) sgimc->cpuctrl0 |= SGIMC_CCTRL0_SYSINIT; enable_irq(SGI_PANEL_IRQ); } static inline void power_button(void) { if (machine_state & MACHINE_PANICED) return; |
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if ((machine_state & MACHINE_SHUTTING_DOWN) || kill_cad_pid(SIGINT, 1)) { |
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/* No init process or button pressed twice. */ sgi_machine_power_off(); } machine_state |= MACHINE_SHUTTING_DOWN; blink_timer.data = POWERDOWN_FREQ; blink_timeout(POWERDOWN_FREQ); init_timer(&power_timer); power_timer.function = power_timeout; power_timer.expires = jiffies + POWERDOWN_TIMEOUT * HZ; add_timer(&power_timer); } |
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static irqreturn_t panel_int(int irq, void *dev_id) |
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{ unsigned int buttons; buttons = sgioc->panel; sgioc->panel = SGIOC_PANEL_POWERON | SGIOC_PANEL_POWERINTR; if (sgint->istat1 & SGINT_ISTAT1_PWR) { /* Wait until interrupt goes away */ |
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disable_irq_nosync(SGI_PANEL_IRQ); |
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init_timer(&debounce_timer); debounce_timer.function = debounce; debounce_timer.expires = jiffies + 5; add_timer(&debounce_timer); } |
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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 * House. Only lowest 2 bits are used. Guiness uses upper four bits * for volume control". This is not true, all bits are pulled high * on fullhouse */ |
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if (!(buttons & SGIOC_PANEL_POWERINTR)) |
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power_button(); |
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return IRQ_HANDLED; } static int panic_event(struct notifier_block *this, unsigned long event, void *ptr) { if (machine_state & MACHINE_PANICED) return NOTIFY_DONE; machine_state |= MACHINE_PANICED; blink_timer.data = PANIC_FREQ; blink_timeout(PANIC_FREQ); return NOTIFY_DONE; } static struct notifier_block panic_block = { .notifier_call = panic_event, }; static int __init reboot_setup(void) { |
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int res; |
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_machine_restart = sgi_machine_restart; _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); if (res) { printk(KERN_ERR "Allocation of front panel IRQ failed "); return res; } |
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init_timer(&blink_timer); blink_timer.function = blink_timeout; |
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atomic_notifier_chain_register(&panic_notifier_list, &panic_block); |
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return 0; } subsys_initcall(reboot_setup); |