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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.
*
* 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);
}
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