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authorDavid S. Miller <davem@sunset.davemloft.net>2007-07-11 21:18:04 -0400
committerDavid S. Miller <davem@sunset.davemloft.net>2007-07-16 07:04:16 -0400
commit13077d80286205e02eebe1c2786a914a4bbd2588 (patch)
tree837b11e18353eaf6550ec9f831adedcada1986ef /arch/sparc64/kernel/power.c
parent2c4f4ecb7a421e0be6632d3366f0bc7cdf1e38b1 (diff)
[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>
Diffstat (limited to 'arch/sparc64/kernel/power.c')
-rw-r--r--arch/sparc64/kernel/power.c54
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 @@
1/* $Id: power.c,v 1.10 2001/12/11 01:57:16 davem Exp $ 1/* power.c: Power management driver.
2 * power.c: Power management driver.
3 * 2 *
4 * Copyright (C) 1999 David S. Miller (davem@redhat.com) 3 * Copyright (C) 1999, 2007 David S. Miller (davem@davemloft.net)
5 */ 4 */
6 5
7#include <linux/kernel.h> 6#include <linux/kernel.h>
@@ -19,6 +18,7 @@
19#include <asm/prom.h> 18#include <asm/prom.h>
20#include <asm/of_device.h> 19#include <asm/of_device.h>
21#include <asm/io.h> 20#include <asm/io.h>
21#include <asm/power.h>
22#include <asm/sstate.h> 22#include <asm/sstate.h>
23 23
24#include <linux/unistd.h> 24#include <linux/unistd.h>
@@ -29,24 +29,26 @@
29 */ 29 */
30int scons_pwroff = 1; 30int scons_pwroff = 1;
31 31
32#ifdef CONFIG_PCI
33#include <linux/pci.h>
34static void __iomem *power_reg; 32static void __iomem *power_reg;
35 33
36static DECLARE_WAIT_QUEUE_HEAD(powerd_wait); 34static DECLARE_WAIT_QUEUE_HEAD(powerd_wait);
37static int button_pressed; 35static int button_pressed;
38 36
39static irqreturn_t power_handler(int irq, void *dev_id) 37void wake_up_powerd(void)
40{ 38{
41 if (button_pressed == 0) { 39 if (button_pressed == 0) {
42 button_pressed = 1; 40 button_pressed = 1;
43 wake_up(&powerd_wait); 41 wake_up(&powerd_wait);
44 } 42 }
43}
44
45static irqreturn_t power_handler(int irq, void *dev_id)
46{
47 wake_up_powerd();
45 48
46 /* FIXME: Check registers for status... */ 49 /* FIXME: Check registers for status... */
47 return IRQ_HANDLED; 50 return IRQ_HANDLED;
48} 51}
49#endif /* CONFIG_PCI */
50 52
51extern void machine_halt(void); 53extern void machine_halt(void);
52extern void machine_alt_power_off(void); 54extern void machine_alt_power_off(void);
@@ -56,19 +58,18 @@ void machine_power_off(void)
56{ 58{
57 sstate_poweroff(); 59 sstate_poweroff();
58 if (!serial_console || scons_pwroff) { 60 if (!serial_console || scons_pwroff) {
59#ifdef CONFIG_PCI
60 if (power_reg) { 61 if (power_reg) {
61 /* Both register bits seem to have the 62 /* Both register bits seem to have the
62 * same effect, so until I figure out 63 * same effect, so until I figure out
63 * what the difference is... 64 * what the difference is...
64 */ 65 */
65 writel(AUXIO_PCIO_CPWR_OFF | AUXIO_PCIO_SPWR_OFF, power_reg); 66 writel(AUXIO_PCIO_CPWR_OFF | AUXIO_PCIO_SPWR_OFF, power_reg);
66 } else 67 } else {
67#endif /* CONFIG_PCI */
68 if (poweroff_method != NULL) { 68 if (poweroff_method != NULL) {
69 poweroff_method(); 69 poweroff_method();
70 /* not reached */ 70 /* not reached */
71 } 71 }
72 }
72 } 73 }
73 machine_halt(); 74 machine_halt();
74} 75}
@@ -76,7 +77,6 @@ void machine_power_off(void)
76void (*pm_power_off)(void) = machine_power_off; 77void (*pm_power_off)(void) = machine_power_off;
77EXPORT_SYMBOL(pm_power_off); 78EXPORT_SYMBOL(pm_power_off);
78 79
79#ifdef CONFIG_PCI
80static int powerd(void *__unused) 80static int powerd(void *__unused)
81{ 81{
82 static char *envp[] = { "HOME=/", "TERM=linux", "PATH=/sbin:/usr/sbin:/bin:/usr/bin", NULL }; 82 static char *envp[] = { "HOME=/", "TERM=linux", "PATH=/sbin:/usr/sbin:/bin:/usr/bin", NULL };
@@ -86,7 +86,7 @@ static int powerd(void *__unused)
86 daemonize("powerd"); 86 daemonize("powerd");
87 87
88 add_wait_queue(&powerd_wait, &wait); 88 add_wait_queue(&powerd_wait, &wait);
89again: 89
90 for (;;) { 90 for (;;) {
91 set_task_state(current, TASK_INTERRUPTIBLE); 91 set_task_state(current, TASK_INTERRUPTIBLE);
92 if (button_pressed) 92 if (button_pressed)
@@ -100,16 +100,28 @@ again:
100 /* Ok, down we go... */ 100 /* Ok, down we go... */
101 button_pressed = 0; 101 button_pressed = 0;
102 if (kernel_execve("/sbin/shutdown", argv, envp) < 0) { 102 if (kernel_execve("/sbin/shutdown", argv, envp) < 0) {
103 printk("powerd: shutdown execution failed\n"); 103 printk(KERN_ERR "powerd: shutdown execution failed\n");
104 add_wait_queue(&powerd_wait, &wait); 104 machine_power_off();
105 goto again;
106 } 105 }
107 return 0; 106 return 0;
108} 107}
109 108
109int start_powerd(void)
110{
111 int err;
112
113 err = kernel_thread(powerd, NULL, CLONE_FS);
114 if (err < 0)
115 printk(KERN_ERR "power: Failed to start power daemon.\n");
116 else
117 printk(KERN_INFO "power: powerd running.\n");
118
119 return err;
120}
121
110static int __init has_button_interrupt(unsigned int irq, struct device_node *dp) 122static int __init has_button_interrupt(unsigned int irq, struct device_node *dp)
111{ 123{
112 if (irq == PCI_IRQ_NONE) 124 if (irq == 0xffffffff)
113 return 0; 125 return 0;
114 if (!of_find_property(dp, "button", NULL)) 126 if (!of_find_property(dp, "button", NULL))
115 return 0; 127 return 0;
@@ -130,17 +142,14 @@ static int __devinit power_probe(struct of_device *op, const struct of_device_id
130 poweroff_method = machine_halt; /* able to use the standard halt */ 142 poweroff_method = machine_halt; /* able to use the standard halt */
131 143
132 if (has_button_interrupt(irq, op->node)) { 144 if (has_button_interrupt(irq, op->node)) {
133 if (kernel_thread(powerd, NULL, CLONE_FS) < 0) { 145 if (start_powerd() < 0)
134 printk("Failed to start power daemon.\n");
135 return 0; 146 return 0;
136 }
137 printk("powerd running.\n");
138 147
139 if (request_irq(irq, 148 if (request_irq(irq,
140 power_handler, 0, "power", NULL) < 0) 149 power_handler, 0, "power", NULL) < 0)
141 printk("power: Error, cannot register IRQ handler.\n"); 150 printk(KERN_ERR "power: Cannot setup IRQ handler.\n");
142 } else { 151 } else {
143 printk("not using powerd.\n"); 152 printk(KERN_INFO "power: Not using powerd.\n");
144 } 153 }
145 154
146 return 0; 155 return 0;
@@ -164,4 +173,3 @@ void __init power_init(void)
164 of_register_driver(&power_driver, &of_bus_type); 173 of_register_driver(&power_driver, &of_bus_type);
165 return; 174 return;
166} 175}
167#endif /* CONFIG_PCI */