arch/sparc64/kernel/power.c

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 1 /* $Id: power.c,v 1.4 1999/08/31 18:22:05 davem Exp $
 2  * power.c: Power management driver.
 3  *
 4  * Copyright (C) 1999 David S. Miller (davem@redhat.com)
 5  */
 6
 7 #include <linux/config.h>
 8 #include <linux/kernel.h>
 9 #include <linux/init.h>
 10 #include <linux/sched.h>
 11 #include <linux/signal.h>
 12 #include <linux/delay.h>
 13
 14 #include <asm/ebus.h>
 15
 16 #define __KERNEL_SYSCALLS__
 17 #include <linux/unistd.h>
 18
 19 #ifdef CONFIG_PCI
 20 static unsigned long power_reg =0UL;
 21 #define POWER_SYSTEM_OFF (1 << 0)
 22 #define POWER_COURTESY_OFF (1 << 1)
 23
 24 staticDECLARE_WAIT_QUEUE_HEAD(powerd_wait);
 25 static int button_pressed =0;
 26
 27 static voidpower_handler(int irq,void*dev_id,struct pt_regs *regs)
 28 {
 29 if(button_pressed ==0) {
 30 wake_up(&powerd_wait);
 31  button_pressed =1;
 32 }
 33 }
 34 #endif/* CONFIG_PCI */
 35
 36 externvoidmachine_halt(void);
 37
 38 voidmachine_power_off(void)
 39 {
 40 #ifdef CONFIG_PCI
 41 if(power_reg !=0UL) {
 42 /* Both register bits seem to have the
 43  * same effect, so until I figure out
 44  * what the difference is...
 45  */
 46 writel(POWER_COURTESY_OFF | POWER_SYSTEM_OFF, power_reg);
 47 }
 48 #endif/* CONFIG_PCI */
 49 machine_halt();
 50 }
 51
 52 #ifdef CONFIG_PCI
 53 static intpowerd(void*__unused)
 54 {
 55 static char*envp[] = {"HOME=/","TERM=linux","PATH=/sbin:/usr/sbin:/bin:/usr/bin", NULL };
 56 char*argv[] = {"/usr/bin/shutdown","-h","now", NULL };
 57
 58  current->session =1;
 59  current->pgrp =1;
 60 sprintf(current->comm,"powerd");
 61
 62 again:
 63 while(button_pressed ==0) {
 64 spin_lock_irq(&current->sigmask_lock);
 65 flush_signals(current);
 66 spin_unlock_irq(&current->sigmask_lock);
 67 interruptible_sleep_on(&powerd_wait);
 68 }
 69
 70 /* Ok, down we go... */
 71 if(execve("/usr/bin/shutdown", argv, envp) <0) {
 72 printk("powerd: shutdown execution failed\n");
 73  button_pressed =0;
 74 goto again;
 75 }
 76 return0;
 77 }
 78
 79 void __init power_init(void)
 80 {
 81 struct linux_ebus *ebus;
 82 struct linux_ebus_device *edev;
 83
 84 for_each_ebus(ebus) {
 85 for_each_ebusdev(edev, ebus) {
 86 if(!strcmp(edev->prom_name,"power"))
 87 goto found;
 88 }
 89 }
 90 return;
 91
 92 found:
 93  power_reg = edev->resource[0].start;
 94 printk("power: Control reg at %016lx ... ", power_reg);
 95 if(kernel_thread(powerd,0, CLONE_FS) <0) {
 96 printk("Failed to start power daemon.\n");
 97 return;
 98 }
 99 printk("powerd running.\n");
 100 if(request_irq(edev->irqs[0],
 101  power_handler, SA_SHIRQ,"power",
 102 (void*) power_reg) <0)
 103 printk("power: Error, cannot register IRQ handler.\n");
 104 }
 105 #endif/* CONFIG_PCI */