[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: David S. Miller <davem@davemloft.net>

arch/sparc64/kernel/power.c

-/* $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 */

include/asm-sparc64/power.h

+#ifndef _SPARC64_POWER_H
+#define _SPARC64_POWER_H
+
+extern void wake_up_powerd(void);
+extern int start_powerd(void);
+
+#endif /* !(_SPARC64_POWER_H) */