Merge rsync://rsync.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
[linux-2.6] / arch / sparc64 / kernel / power.c
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 #define __KERNEL_SYSCALLS__
8
9 #include <linux/config.h>
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/sched.h>
14 #include <linux/signal.h>
15 #include <linux/delay.h>
16 #include <linux/interrupt.h>
17 #include <linux/pm.h>
18
19 #include <asm/system.h>
20 #include <asm/ebus.h>
21 #include <asm/isa.h>
22 #include <asm/auxio.h>
23
24 #include <linux/unistd.h>
25
26 /*
27  * sysctl - toggle power-off restriction for serial console 
28  * systems in machine_power_off()
29  */
30 int scons_pwroff = 1; 
31
32 #ifdef CONFIG_PCI
33 static void __iomem *power_reg;
34
35 static DECLARE_WAIT_QUEUE_HEAD(powerd_wait);
36 static int button_pressed;
37
38 static irqreturn_t power_handler(int irq, void *dev_id, struct pt_regs *regs)
39 {
40         if (button_pressed == 0) {
41                 button_pressed = 1;
42                 wake_up(&powerd_wait);
43         }
44
45         /* FIXME: Check registers for status... */
46         return IRQ_HANDLED;
47 }
48 #endif /* CONFIG_PCI */
49
50 extern void machine_halt(void);
51 extern void machine_alt_power_off(void);
52 static void (*poweroff_method)(void) = machine_alt_power_off;
53
54 void machine_power_off(void)
55 {
56         if (!serial_console || scons_pwroff) {
57 #ifdef CONFIG_PCI
58                 if (power_reg) {
59                         /* Both register bits seem to have the
60                          * same effect, so until I figure out
61                          * what the difference is...
62                          */
63                         writel(AUXIO_PCIO_CPWR_OFF | AUXIO_PCIO_SPWR_OFF, power_reg);
64                 } else
65 #endif /* CONFIG_PCI */
66                         if (poweroff_method != NULL) {
67                                 poweroff_method();
68                                 /* not reached */
69                         }
70         }
71         machine_halt();
72 }
73
74 void (*pm_power_off)(void) = machine_power_off;
75 EXPORT_SYMBOL(pm_power_off);
76
77 #ifdef CONFIG_PCI
78 static int powerd(void *__unused)
79 {
80         static char *envp[] = { "HOME=/", "TERM=linux", "PATH=/sbin:/usr/sbin:/bin:/usr/bin", NULL };
81         char *argv[] = { "/sbin/shutdown", "-h", "now", NULL };
82         DECLARE_WAITQUEUE(wait, current);
83
84         daemonize("powerd");
85
86         add_wait_queue(&powerd_wait, &wait);
87 again:
88         for (;;) {
89                 set_task_state(current, TASK_INTERRUPTIBLE);
90                 if (button_pressed)
91                         break;
92                 flush_signals(current);
93                 schedule();
94         }
95         __set_current_state(TASK_RUNNING);
96         remove_wait_queue(&powerd_wait, &wait);
97
98         /* Ok, down we go... */
99         button_pressed = 0;
100         if (execve("/sbin/shutdown", argv, envp) < 0) {
101                 printk("powerd: shutdown execution failed\n");
102                 add_wait_queue(&powerd_wait, &wait);
103                 goto again;
104         }
105         return 0;
106 }
107
108 static int __init has_button_interrupt(unsigned int irq, struct device_node *dp)
109 {
110         if (irq == PCI_IRQ_NONE)
111                 return 0;
112         if (!of_find_property(dp, "button", NULL))
113                 return 0;
114
115         return 1;
116 }
117
118 static void __devinit power_probe_common(struct of_device *dev, struct resource *res, unsigned int irq)
119 {
120         power_reg = ioremap(res->start, 0x4);
121
122         printk("power: Control reg at %p ... ", power_reg);
123
124         poweroff_method = machine_halt;  /* able to use the standard halt */
125
126         if (has_button_interrupt(irq, dev->node)) {
127                 if (kernel_thread(powerd, NULL, CLONE_FS) < 0) {
128                         printk("Failed to start power daemon.\n");
129                         return;
130                 }
131                 printk("powerd running.\n");
132
133                 if (request_irq(irq,
134                                 power_handler, SA_SHIRQ, "power", NULL) < 0)
135                         printk("power: Error, cannot register IRQ handler.\n");
136         } else {
137                 printk("not using powerd.\n");
138         }
139 }
140
141 static struct of_device_id power_match[] = {
142         {
143                 .name = "power",
144         },
145         {},
146 };
147
148 static int __devinit ebus_power_probe(struct of_device *dev, const struct of_device_id *match)
149 {
150         struct linux_ebus_device *edev = to_ebus_device(&dev->dev);
151         struct resource *res = &edev->resource[0];
152         unsigned int irq = edev->irqs[0];
153
154         power_probe_common(dev, res,irq);
155
156         return 0;
157 }
158
159 static struct of_platform_driver ebus_power_driver = {
160         .name           = "power",
161         .match_table    = power_match,
162         .probe          = ebus_power_probe,
163 };
164
165 static int __devinit isa_power_probe(struct of_device *dev, const struct of_device_id *match)
166 {
167         struct sparc_isa_device *idev = to_isa_device(&dev->dev);
168         struct resource *res = &idev->resource;
169         unsigned int irq = idev->irq;
170
171         power_probe_common(dev, res,irq);
172
173         return 0;
174 }
175
176 static struct of_platform_driver isa_power_driver = {
177         .name           = "power",
178         .match_table    = power_match,
179         .probe          = isa_power_probe,
180 };
181
182 void __init power_init(void)
183 {
184         of_register_driver(&ebus_power_driver, &ebus_bus_type);
185         of_register_driver(&isa_power_driver, &isa_bus_type);
186         return;
187 }
188 #endif /* CONFIG_PCI */