e55466c77b61efaf0a8c13172e0dc100bcf3a2a1
[linux-3.10.git] / 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/kernel.h>
10 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/sched.h>
13 #include <linux/signal.h>
14 #include <linux/delay.h>
15 #include <linux/interrupt.h>
16 #include <linux/pm.h>
17
18 #include <asm/system.h>
19 #include <asm/auxio.h>
20 #include <asm/prom.h>
21 #include <asm/of_device.h>
22 #include <asm/io.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 #include <linux/pci.h>
34 static void __iomem *power_reg;
35
36 static DECLARE_WAIT_QUEUE_HEAD(powerd_wait);
37 static int button_pressed;
38
39 static irqreturn_t power_handler(int irq, void *dev_id, struct pt_regs *regs)
40 {
41         if (button_pressed == 0) {
42                 button_pressed = 1;
43                 wake_up(&powerd_wait);
44         }
45
46         /* FIXME: Check registers for status... */
47         return IRQ_HANDLED;
48 }
49 #endif /* CONFIG_PCI */
50
51 extern void machine_halt(void);
52 extern void machine_alt_power_off(void);
53 static void (*poweroff_method)(void) = machine_alt_power_off;
54
55 void machine_power_off(void)
56 {
57         if (!serial_console || scons_pwroff) {
58 #ifdef CONFIG_PCI
59                 if (power_reg) {
60                         /* Both register bits seem to have the
61                          * same effect, so until I figure out
62                          * what the difference is...
63                          */
64                         writel(AUXIO_PCIO_CPWR_OFF | AUXIO_PCIO_SPWR_OFF, power_reg);
65                 } else
66 #endif /* CONFIG_PCI */
67                         if (poweroff_method != NULL) {
68                                 poweroff_method();
69                                 /* not reached */
70                         }
71         }
72         machine_halt();
73 }
74
75 void (*pm_power_off)(void) = machine_power_off;
76 EXPORT_SYMBOL(pm_power_off);
77
78 #ifdef CONFIG_PCI
79 static int powerd(void *__unused)
80 {
81         static char *envp[] = { "HOME=/", "TERM=linux", "PATH=/sbin:/usr/sbin:/bin:/usr/bin", NULL };
82         char *argv[] = { "/sbin/shutdown", "-h", "now", NULL };
83         DECLARE_WAITQUEUE(wait, current);
84
85         daemonize("powerd");
86
87         add_wait_queue(&powerd_wait, &wait);
88 again:
89         for (;;) {
90                 set_task_state(current, TASK_INTERRUPTIBLE);
91                 if (button_pressed)
92                         break;
93                 flush_signals(current);
94                 schedule();
95         }
96         __set_current_state(TASK_RUNNING);
97         remove_wait_queue(&powerd_wait, &wait);
98
99         /* Ok, down we go... */
100         button_pressed = 0;
101         if (execve("/sbin/shutdown", argv, envp) < 0) {
102                 printk("powerd: shutdown execution failed\n");
103                 add_wait_queue(&powerd_wait, &wait);
104                 goto again;
105         }
106         return 0;
107 }
108
109 static int __init has_button_interrupt(unsigned int irq, struct device_node *dp)
110 {
111         if (irq == PCI_IRQ_NONE)
112                 return 0;
113         if (!of_find_property(dp, "button", NULL))
114                 return 0;
115
116         return 1;
117 }
118
119 static int __devinit power_probe(struct of_device *op, const struct of_device_id *match)
120 {
121         struct resource *res = &op->resource[0];
122         unsigned int irq= op->irqs[0];
123
124         power_reg = of_ioremap(res, 0, 0x4, "power");
125
126         printk("%s: Control reg at %lx ... ",
127                op->node->name, res->start);
128
129         poweroff_method = machine_halt;  /* able to use the standard halt */
130
131         if (has_button_interrupt(irq, op->node)) {
132                 if (kernel_thread(powerd, NULL, CLONE_FS) < 0) {
133                         printk("Failed to start power daemon.\n");
134                         return 0;
135                 }
136                 printk("powerd running.\n");
137
138                 if (request_irq(irq,
139                                 power_handler, 0, "power", NULL) < 0)
140                         printk("power: Error, cannot register IRQ handler.\n");
141         } else {
142                 printk("not using powerd.\n");
143         }
144
145         return 0;
146 }
147
148 static struct of_device_id power_match[] = {
149         {
150                 .name = "power",
151         },
152         {},
153 };
154
155 static struct of_platform_driver power_driver = {
156         .name           = "power",
157         .match_table    = power_match,
158         .probe          = power_probe,
159 };
160
161 void __init power_init(void)
162 {
163         of_register_driver(&power_driver, &of_bus_type);
164         return;
165 }
166 #endif /* CONFIG_PCI */