[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>

1 files changed, 31 insertions, 23 deletions

diff --git a/arch/sparc64/kernel/power.c b/arch/sparc64/kernel/power.c
index 5d6adea3967f..8dd4294ad21e 100644
--- a/arch/sparc64/kernel/power.c
+++ b/arch/sparc64/kernel/power.c
@@ -1,7 +1,6 @@
-/* $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 */