Commit 13077d80 authored by David S. Miller's avatar David S. Miller
Browse files

[SPARC64]: Export powerd facilities for external entities.



Besides the existing usage for power-button interrupts, we'll
want to make use of this code for domain-services where the
LDOM manager can send reboot requests to the guest node.
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 2c4f4ecb
/* $Id: power.c,v 1.10 2001/12/11 01:57:16 davem Exp $
* power.c: Power management driver.
/* power.c: Power management driver.
*
* Copyright (C) 1999 David S. Miller (davem@redhat.com)
* Copyright (C) 1999, 2007 David S. Miller (davem@davemloft.net)
*/
#include <linux/kernel.h>
......@@ -19,6 +18,7 @@
#include <asm/prom.h>
#include <asm/of_device.h>
#include <asm/io.h>
#include <asm/power.h>
#include <asm/sstate.h>
#include <linux/unistd.h>
......@@ -29,24 +29,26 @@
*/
int scons_pwroff = 1;
#ifdef CONFIG_PCI
#include <linux/pci.h>
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)
void wake_up_powerd(void)
{
if (button_pressed == 0) {
button_pressed = 1;
wake_up(&powerd_wait);
}
}
static irqreturn_t power_handler(int irq, void *dev_id)
{
wake_up_powerd();
/* FIXME: Check registers for status... */
return IRQ_HANDLED;
}
#endif /* CONFIG_PCI */
extern void machine_halt(void);
extern void machine_alt_power_off(void);
......@@ -56,19 +58,18 @@ void machine_power_off(void)
{
sstate_poweroff();
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 */
} else {
if (poweroff_method != NULL) {
poweroff_method();
/* not reached */
}
}
}
machine_halt();
}
......@@ -76,7 +77,6 @@ void machine_power_off(void)
void (*pm_power_off)(void) = machine_power_off;
EXPORT_SYMBOL(pm_power_off);
#ifdef CONFIG_PCI
static int powerd(void *__unused)
{
static char *envp[] = { "HOME=/", "TERM=linux", "PATH=/sbin:/usr/sbin:/bin:/usr/bin", NULL };
......@@ -86,7 +86,7 @@ static int powerd(void *__unused)
daemonize("powerd");
add_wait_queue(&powerd_wait, &wait);
again:
for (;;) {
set_task_state(current, TASK_INTERRUPTIBLE);
if (button_pressed)
......@@ -100,16 +100,28 @@ again:
/* Ok, down we go... */
button_pressed = 0;
if (kernel_execve("/sbin/shutdown", argv, envp) < 0) {
printk("powerd: shutdown execution failed\n");
add_wait_queue(&powerd_wait, &wait);
goto again;
printk(KERN_ERR "powerd: shutdown execution failed\n");
machine_power_off();
}
return 0;
}
int start_powerd(void)
{
int err;
err = kernel_thread(powerd, NULL, CLONE_FS);
if (err < 0)
printk(KERN_ERR "power: Failed to start power daemon.\n");
else
printk(KERN_INFO "power: powerd running.\n");
return err;
}
static int __init has_button_interrupt(unsigned int irq, struct device_node *dp)
{
if (irq == PCI_IRQ_NONE)
if (irq == 0xffffffff)
return 0;
if (!of_find_property(dp, "button", NULL))
return 0;
......@@ -130,17 +142,14 @@ static int __devinit power_probe(struct of_device *op, const struct of_device_id
poweroff_method = machine_halt; /* able to use the standard halt */
if (has_button_interrupt(irq, op->node)) {
if (kernel_thread(powerd, NULL, CLONE_FS) < 0) {
printk("Failed to start power daemon.\n");
if (start_powerd() < 0)
return 0;
}
printk("powerd running.\n");
if (request_irq(irq,
power_handler, 0, "power", NULL) < 0)
printk("power: Error, cannot register IRQ handler.\n");
printk(KERN_ERR "power: Cannot setup IRQ handler.\n");
} else {
printk("not using powerd.\n");
printk(KERN_INFO "power: Not using powerd.\n");
}
return 0;
......@@ -164,4 +173,3 @@ void __init power_init(void)
of_register_driver(&power_driver, &of_bus_type);
return;
}
#endif /* CONFIG_PCI */
#ifndef _SPARC64_POWER_H
#define _SPARC64_POWER_H
extern void wake_up_powerd(void);
extern int start_powerd(void);
#endif /* !(_SPARC64_POWER_H) */
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