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