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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/sparc64/kernel/power.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/sparc64/kernel/power.c')
-rw-r--r--arch/sparc64/kernel/power.c150
1 files changed, 150 insertions, 0 deletions
diff --git a/arch/sparc64/kernel/power.c b/arch/sparc64/kernel/power.c
new file mode 100644
index 000000000000..52f14e399b1c
--- /dev/null
+++ b/arch/sparc64/kernel/power.c
@@ -0,0 +1,150 @@
1/* $Id: power.c,v 1.10 2001/12/11 01:57:16 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/module.h>
10#include <linux/init.h>
11#include <linux/sched.h>
12#include <linux/signal.h>
13#include <linux/delay.h>
14#include <linux/interrupt.h>
15
16#include <asm/system.h>
17#include <asm/ebus.h>
18#include <asm/auxio.h>
19
20#define __KERNEL_SYSCALLS__
21#include <linux/unistd.h>
22
23/*
24 * sysctl - toggle power-off restriction for serial console
25 * systems in machine_power_off()
26 */
27int scons_pwroff = 1;
28
29#ifdef CONFIG_PCI
30static void __iomem *power_reg;
31
32static DECLARE_WAIT_QUEUE_HEAD(powerd_wait);
33static int button_pressed;
34
35static irqreturn_t power_handler(int irq, void *dev_id, struct pt_regs *regs)
36{
37 if (button_pressed == 0) {
38 button_pressed = 1;
39 wake_up(&powerd_wait);
40 }
41
42 /* FIXME: Check registers for status... */
43 return IRQ_HANDLED;
44}
45#endif /* CONFIG_PCI */
46
47extern void machine_halt(void);
48extern void machine_alt_power_off(void);
49static void (*poweroff_method)(void) = machine_alt_power_off;
50
51void machine_power_off(void)
52{
53 if (!serial_console || scons_pwroff) {
54#ifdef CONFIG_PCI
55 if (power_reg) {
56 /* Both register bits seem to have the
57 * same effect, so until I figure out
58 * what the difference is...
59 */
60 writel(AUXIO_PCIO_CPWR_OFF | AUXIO_PCIO_SPWR_OFF, power_reg);
61 } else
62#endif /* CONFIG_PCI */
63 if (poweroff_method != NULL) {
64 poweroff_method();
65 /* not reached */
66 }
67 }
68 machine_halt();
69}
70
71EXPORT_SYMBOL(machine_power_off);
72
73#ifdef CONFIG_PCI
74static int powerd(void *__unused)
75{
76 static char *envp[] = { "HOME=/", "TERM=linux", "PATH=/sbin:/usr/sbin:/bin:/usr/bin", NULL };
77 char *argv[] = { "/sbin/shutdown", "-h", "now", NULL };
78 DECLARE_WAITQUEUE(wait, current);
79
80 daemonize("powerd");
81
82 add_wait_queue(&powerd_wait, &wait);
83again:
84 for (;;) {
85 set_task_state(current, TASK_INTERRUPTIBLE);
86 if (button_pressed)
87 break;
88 flush_signals(current);
89 schedule();
90 }
91 __set_current_state(TASK_RUNNING);
92 remove_wait_queue(&powerd_wait, &wait);
93
94 /* Ok, down we go... */
95 button_pressed = 0;
96 if (execve("/sbin/shutdown", argv, envp) < 0) {
97 printk("powerd: shutdown execution failed\n");
98 add_wait_queue(&powerd_wait, &wait);
99 goto again;
100 }
101 return 0;
102}
103
104static int __init has_button_interrupt(struct linux_ebus_device *edev)
105{
106 if (edev->irqs[0] == PCI_IRQ_NONE)
107 return 0;
108 if (!prom_node_has_property(edev->prom_node, "button"))
109 return 0;
110
111 return 1;
112}
113
114void __init power_init(void)
115{
116 struct linux_ebus *ebus;
117 struct linux_ebus_device *edev;
118 static int invoked;
119
120 if (invoked)
121 return;
122 invoked = 1;
123
124 for_each_ebus(ebus) {
125 for_each_ebusdev(edev, ebus) {
126 if (!strcmp(edev->prom_name, "power"))
127 goto found;
128 }
129 }
130 return;
131
132found:
133 power_reg = ioremap(edev->resource[0].start, 0x4);
134 printk("power: Control reg at %p ... ", power_reg);
135 poweroff_method = machine_halt; /* able to use the standard halt */
136 if (has_button_interrupt(edev)) {
137 if (kernel_thread(powerd, NULL, CLONE_FS) < 0) {
138 printk("Failed to start power daemon.\n");
139 return;
140 }
141 printk("powerd running.\n");
142
143 if (request_irq(edev->irqs[0],
144 power_handler, SA_SHIRQ, "power", NULL) < 0)
145 printk("power: Error, cannot register IRQ handler.\n");
146 } else {
147 printk("not using powerd.\n");
148 }
149}
150#endif /* CONFIG_PCI */