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247 lines
6.1 KiB
247 lines
6.1 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, 2003 by Ralf Baechle
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*/
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#include <linux/init.h>
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#include <linux/ds1286.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/notifier.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/system.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 paniced.
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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, volume_timer;
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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 = 0;
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static void sgi_machine_restart(char *command) __attribute__((noreturn));
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static void sgi_machine_halt(void) __attribute__((noreturn));
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static void sgi_machine_power_off(void) __attribute__((noreturn));
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static void 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 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 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 power_timeout(unsigned long data)
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{
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sgi_machine_power_off();
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}
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static void blink_timeout(unsigned long data)
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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+data);
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}
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static void debounce(unsigned long data)
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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 + 5; /* 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) || kill_proc(1,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.data = POWERDOWN_FREQ;
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blink_timeout(POWERDOWN_FREQ);
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init_timer(&power_timer);
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power_timer.function = power_timeout;
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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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void (*indy_volume_button)(int) = NULL;
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EXPORT_SYMBOL(indy_volume_button);
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static inline void volume_up_button(unsigned long data)
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{
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del_timer(&volume_timer);
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if (indy_volume_button)
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indy_volume_button(1);
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if (sgint->istat1 & SGINT_ISTAT1_PWR) {
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volume_timer.expires = jiffies + 1;
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add_timer(&volume_timer);
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}
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}
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static inline void volume_down_button(unsigned long data)
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{
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del_timer(&volume_timer);
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if (indy_volume_button)
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indy_volume_button(-1);
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if (sgint->istat1 & SGINT_ISTAT1_PWR) {
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volume_timer.expires = jiffies + 1;
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add_timer(&volume_timer);
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}
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}
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static irqreturn_t panel_int(int irq, void *dev_id, struct pt_regs *regs)
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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(SGI_PANEL_IRQ);
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init_timer(&debounce_timer);
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debounce_timer.function = debounce;
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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 (ip22_is_fullhouse() || !(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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/* TODO: mute/unmute */
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/* Volume up button was pressed */
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if (!(buttons & SGIOC_PANEL_VOLUPINTR)) {
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init_timer(&volume_timer);
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volume_timer.function = volume_up_button;
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volume_timer.expires = jiffies + 1;
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add_timer(&volume_timer);
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}
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/* Volume down button was pressed */
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if (!(buttons & SGIOC_PANEL_VOLDNINTR)) {
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init_timer(&volume_timer);
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volume_timer.function = volume_down_button;
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volume_timer.expires = jiffies + 1;
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add_timer(&volume_timer);
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}
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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.data = PANIC_FREQ;
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blink_timeout(PANIC_FREQ);
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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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_machine_restart = sgi_machine_restart;
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_machine_halt = sgi_machine_halt;
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_machine_power_off = sgi_machine_power_off;
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request_irq(SGI_PANEL_IRQ, panel_int, 0, "Front Panel", NULL);
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init_timer(&blink_timer);
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blink_timer.function = blink_timeout;
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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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