forked from Minki/linux
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
151 lines
3.3 KiB
C
151 lines
3.3 KiB
C
/* $Id: power.c,v 1.10 2001/12/11 01:57:16 davem Exp $
|
|
* power.c: Power management driver.
|
|
*
|
|
* Copyright (C) 1999 David S. Miller (davem@redhat.com)
|
|
*/
|
|
|
|
#include <linux/config.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/signal.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/interrupt.h>
|
|
|
|
#include <asm/system.h>
|
|
#include <asm/ebus.h>
|
|
#include <asm/auxio.h>
|
|
|
|
#define __KERNEL_SYSCALLS__
|
|
#include <linux/unistd.h>
|
|
|
|
/*
|
|
* sysctl - toggle power-off restriction for serial console
|
|
* systems in machine_power_off()
|
|
*/
|
|
int scons_pwroff = 1;
|
|
|
|
#ifdef CONFIG_PCI
|
|
static void __iomem *power_reg;
|
|
|
|
static DECLARE_WAIT_QUEUE_HEAD(powerd_wait);
|
|
static int button_pressed;
|
|
|
|
static irqreturn_t power_handler(int irq, void *dev_id, struct pt_regs *regs)
|
|
{
|
|
if (button_pressed == 0) {
|
|
button_pressed = 1;
|
|
wake_up(&powerd_wait);
|
|
}
|
|
|
|
/* FIXME: Check registers for status... */
|
|
return IRQ_HANDLED;
|
|
}
|
|
#endif /* CONFIG_PCI */
|
|
|
|
extern void machine_halt(void);
|
|
extern void machine_alt_power_off(void);
|
|
static void (*poweroff_method)(void) = machine_alt_power_off;
|
|
|
|
void machine_power_off(void)
|
|
{
|
|
if (!serial_console || scons_pwroff) {
|
|
#ifdef CONFIG_PCI
|
|
if (power_reg) {
|
|
/* Both register bits seem to have the
|
|
* same effect, so until I figure out
|
|
* what the difference is...
|
|
*/
|
|
writel(AUXIO_PCIO_CPWR_OFF | AUXIO_PCIO_SPWR_OFF, power_reg);
|
|
} else
|
|
#endif /* CONFIG_PCI */
|
|
if (poweroff_method != NULL) {
|
|
poweroff_method();
|
|
/* not reached */
|
|
}
|
|
}
|
|
machine_halt();
|
|
}
|
|
|
|
EXPORT_SYMBOL(machine_power_off);
|
|
|
|
#ifdef CONFIG_PCI
|
|
static int powerd(void *__unused)
|
|
{
|
|
static char *envp[] = { "HOME=/", "TERM=linux", "PATH=/sbin:/usr/sbin:/bin:/usr/bin", NULL };
|
|
char *argv[] = { "/sbin/shutdown", "-h", "now", NULL };
|
|
DECLARE_WAITQUEUE(wait, current);
|
|
|
|
daemonize("powerd");
|
|
|
|
add_wait_queue(&powerd_wait, &wait);
|
|
again:
|
|
for (;;) {
|
|
set_task_state(current, TASK_INTERRUPTIBLE);
|
|
if (button_pressed)
|
|
break;
|
|
flush_signals(current);
|
|
schedule();
|
|
}
|
|
__set_current_state(TASK_RUNNING);
|
|
remove_wait_queue(&powerd_wait, &wait);
|
|
|
|
/* Ok, down we go... */
|
|
button_pressed = 0;
|
|
if (execve("/sbin/shutdown", argv, envp) < 0) {
|
|
printk("powerd: shutdown execution failed\n");
|
|
add_wait_queue(&powerd_wait, &wait);
|
|
goto again;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int __init has_button_interrupt(struct linux_ebus_device *edev)
|
|
{
|
|
if (edev->irqs[0] == PCI_IRQ_NONE)
|
|
return 0;
|
|
if (!prom_node_has_property(edev->prom_node, "button"))
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
void __init power_init(void)
|
|
{
|
|
struct linux_ebus *ebus;
|
|
struct linux_ebus_device *edev;
|
|
static int invoked;
|
|
|
|
if (invoked)
|
|
return;
|
|
invoked = 1;
|
|
|
|
for_each_ebus(ebus) {
|
|
for_each_ebusdev(edev, ebus) {
|
|
if (!strcmp(edev->prom_name, "power"))
|
|
goto found;
|
|
}
|
|
}
|
|
return;
|
|
|
|
found:
|
|
power_reg = ioremap(edev->resource[0].start, 0x4);
|
|
printk("power: Control reg at %p ... ", power_reg);
|
|
poweroff_method = machine_halt; /* able to use the standard halt */
|
|
if (has_button_interrupt(edev)) {
|
|
if (kernel_thread(powerd, NULL, CLONE_FS) < 0) {
|
|
printk("Failed to start power daemon.\n");
|
|
return;
|
|
}
|
|
printk("powerd running.\n");
|
|
|
|
if (request_irq(edev->irqs[0],
|
|
power_handler, SA_SHIRQ, "power", NULL) < 0)
|
|
printk("power: Error, cannot register IRQ handler.\n");
|
|
} else {
|
|
printk("not using powerd.\n");
|
|
}
|
|
}
|
|
#endif /* CONFIG_PCI */
|