/* * 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. * * Copyright (C) 1997, 1998, 2001 by Ralf Baechle */#include <linux/kernel.h>#include <linux/sched.h>#include <linux/notifier.h>#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/sgihpc.h>#include <asm/sgi/sgint23.h>/* * Just powerdown if init hasn't done after POWERDOWN_TIMEOUT seconds. * I'm not shure 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/* * Blink frequency during reboot grace period and when paniced. */#define POWERDOWN_FREQ		(HZ / 4)#define PANIC_FREQ		(HZ / 8)static unsigned char sgi_volume;static struct timer_list power_timer, blink_timer, debounce_timer, volume_timer;static int shuting_down, has_paniced;static void sgi_machine_restart(char *command) __attribute__((noreturn));static void sgi_machine_halt(void) __attribute__((noreturn));static void sgi_machine_power_off(void) __attribute__((noreturn));/* XXX How to pass the reboot command to the firmware??? */static void sgi_machine_restart(char *command){	if (shuting_down)		sgi_machine_power_off();	prom_reboot();}static void sgi_machine_halt(void){	if (shuting_down)		sgi_machine_power_off();	ArcEnterInteractiveMode();}static void sgi_machine_power_off(void){	struct indy_clock *clock = (struct indy_clock *)INDY_CLOCK_REGS;	cli();	clock->cmd |= 0x08;	/* Disable watchdog */	clock->whsec = 0;	clock->wsec = 0;	while(1) {		hpc3mregs->panel=0xfe;		/* Good bye cruel world ...  */		/* If we're still running, we probably got sent an alarm		   interrupt.  Read the flag to clear it.  */		clock->halarm;	}}static void power_timeout(unsigned long data){	sgi_machine_power_off();}static void blink_timeout(unsigned long data){	/* XXX fix this for fullhouse  */	sgi_hpc_write1 ^= (HPC3_WRITE1_LC0OFF|HPC3_WRITE1_LC1OFF);	hpc3mregs->write1 = sgi_hpc_write1;	mod_timer(&blink_timer, jiffies+data);}static void debounce(unsigned long data){	del_timer(&debounce_timer);	if (ioc_icontrol->istat1 & 2) { /* Interrupt still being sent.  */		debounce_timer.expires = jiffies + 5; /* 0.05s  */		add_timer(&debounce_timer);		hpc3mregs->panel = 0xf3;		return;	}	if (has_paniced)		prom_reboot();	enable_irq(SGI_PANEL_IRQ);}static inline void power_button(void){	if (has_paniced)		return;	if (shuting_down || kill_proc(1, SIGINT, 1)) {		/* No init process or button pressed twice.  */		sgi_machine_power_off();	}	shuting_down = 1;	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);}void inline sgi_volume_set(unsigned char volume){	sgi_volume = volume;	hpc3c0->pbus_extregs[2][0] = sgi_volume;	hpc3c0->pbus_extregs[2][1] = sgi_volume;}void inline sgi_volume_get(unsigned char *volume){	*volume = sgi_volume;}static inline void volume_up_button(unsigned long data){	del_timer(&volume_timer);	if (sgi_volume < 0xff)		sgi_volume++;	hpc3c0->pbus_extregs[2][0] = sgi_volume;	hpc3c0->pbus_extregs[2][1] = sgi_volume;	if (ioc_icontrol->istat1 & 2) {		volume_timer.expires = jiffies + 1;		add_timer(&volume_timer);	}}static inline void volume_down_button(unsigned long data){	del_timer(&volume_timer);	if (sgi_volume > 0)		sgi_volume--;	hpc3c0->pbus_extregs[2][0] = sgi_volume;	hpc3c0->pbus_extregs[2][1] = sgi_volume;	if (ioc_icontrol->istat1 & 2) {		volume_timer.expires = jiffies + 1;		add_timer(&volume_timer);	}}static void panel_int(int irq, void *dev_id, struct pt_regs *regs){	unsigned int buttons;	buttons = hpc3mregs->panel;	hpc3mregs->panel = 3; /* power_interrupt | power_supply_on */	if (ioc_icontrol->istat1 & 2) { /* Wait until interrupt goes away */		disable_irq(SGI_PANEL_IRQ);		init_timer(&debounce_timer);		debounce_timer.function = debounce;		debounce_timer.expires = jiffies + 5;		add_timer(&debounce_timer);	}	if (!(buttons & 2))		/* Power button was pressed */		power_button();	if (!(buttons & 0x40)) {	/* Volume up button was pressed */		init_timer(&volume_timer);		volume_timer.function = volume_up_button;		volume_timer.expires = jiffies + 1;		add_timer(&volume_timer);	}	if (!(buttons & 0x10)) {	/* Volume down button was pressed */		init_timer(&volume_timer);		volume_timer.function = volume_down_button;		volume_timer.expires = jiffies + 1;		add_timer(&volume_timer);	}}static int panic_event(struct notifier_block *this, unsigned long event,                      void *ptr){	if (has_paniced)		return NOTIFY_DONE;	has_paniced = 1;	blink_timer.data = PANIC_FREQ;	blink_timeout(PANIC_FREQ);	return NOTIFY_DONE;}static struct notifier_block panic_block = {	panic_event,	NULL,	0};void indy_reboot_setup(void){	static int setup_done;	if (setup_done)		return;	setup_done = 1;	_machine_restart = sgi_machine_restart;	_machine_halt = sgi_machine_halt;	_machine_power_off = sgi_machine_power_off;	request_irq(SGI_PANEL_IRQ, panel_int, 0, "Front Panel", NULL);	init_timer(&blink_timer);	blink_timer.function = blink_timeout;	notifier_chain_register(&panic_notifier_list, &panic_block);}