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1da177e4 LT |
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 | ||
1da177e4 LT |
7 | #include <linux/kernel.h> |
8 | #include <linux/module.h> | |
9 | #include <linux/init.h> | |
10 | #include <linux/sched.h> | |
11 | #include <linux/signal.h> | |
12 | #include <linux/delay.h> | |
13 | #include <linux/interrupt.h> | |
90bf8116 | 14 | #include <linux/pm.h> |
67608567 | 15 | #include <linux/syscalls.h> |
1da177e4 LT |
16 | |
17 | #include <asm/system.h> | |
1da177e4 | 18 | #include <asm/auxio.h> |
abbce6e2 DM |
19 | #include <asm/prom.h> |
20 | #include <asm/of_device.h> | |
21 | #include <asm/io.h> | |
1da177e4 | 22 | |
1da177e4 LT |
23 | #include <linux/unistd.h> |
24 | ||
25 | /* | |
26 | * sysctl - toggle power-off restriction for serial console | |
27 | * systems in machine_power_off() | |
28 | */ | |
29 | int scons_pwroff = 1; | |
30 | ||
31 | #ifdef CONFIG_PCI | |
abbce6e2 | 32 | #include <linux/pci.h> |
1da177e4 LT |
33 | static void __iomem *power_reg; |
34 | ||
35 | static DECLARE_WAIT_QUEUE_HEAD(powerd_wait); | |
36 | static int button_pressed; | |
37 | ||
6d24c8dc | 38 | static irqreturn_t power_handler(int irq, void *dev_id) |
1da177e4 LT |
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 | ||
90bf8116 DM |
74 | void (*pm_power_off)(void) = machine_power_off; |
75 | EXPORT_SYMBOL(pm_power_off); | |
76 | ||
1da177e4 LT |
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; | |
67608567 | 100 | if (kernel_execve("/sbin/shutdown", argv, envp) < 0) { |
1da177e4 LT |
101 | printk("powerd: shutdown execution failed\n"); |
102 | add_wait_queue(&powerd_wait, &wait); | |
103 | goto again; | |
104 | } | |
105 | return 0; | |
106 | } | |
107 | ||
690c8fd3 | 108 | static int __init has_button_interrupt(unsigned int irq, struct device_node *dp) |
1da177e4 | 109 | { |
2256c13b | 110 | if (irq == PCI_IRQ_NONE) |
1da177e4 | 111 | return 0; |
690c8fd3 | 112 | if (!of_find_property(dp, "button", NULL)) |
1da177e4 LT |
113 | return 0; |
114 | ||
115 | return 1; | |
116 | } | |
117 | ||
abbce6e2 | 118 | static int __devinit power_probe(struct of_device *op, const struct of_device_id *match) |
1da177e4 | 119 | { |
abbce6e2 DM |
120 | struct resource *res = &op->resource[0]; |
121 | unsigned int irq= op->irqs[0]; | |
a2bd4fd1 | 122 | |
abbce6e2 DM |
123 | power_reg = of_ioremap(res, 0, 0x4, "power"); |
124 | ||
125 | printk("%s: Control reg at %lx ... ", | |
126 | op->node->name, res->start); | |
a2bd4fd1 | 127 | |
1da177e4 | 128 | poweroff_method = machine_halt; /* able to use the standard halt */ |
a2bd4fd1 | 129 | |
abbce6e2 | 130 | if (has_button_interrupt(irq, op->node)) { |
1da177e4 LT |
131 | if (kernel_thread(powerd, NULL, CLONE_FS) < 0) { |
132 | printk("Failed to start power daemon.\n"); | |
abbce6e2 | 133 | return 0; |
1da177e4 LT |
134 | } |
135 | printk("powerd running.\n"); | |
136 | ||
2256c13b | 137 | if (request_irq(irq, |
00cde674 | 138 | power_handler, 0, "power", NULL) < 0) |
1da177e4 LT |
139 | printk("power: Error, cannot register IRQ handler.\n"); |
140 | } else { | |
141 | printk("not using powerd.\n"); | |
142 | } | |
abbce6e2 DM |
143 | |
144 | return 0; | |
1da177e4 | 145 | } |
a2bd4fd1 DM |
146 | |
147 | static struct of_device_id power_match[] = { | |
148 | { | |
149 | .name = "power", | |
150 | }, | |
151 | {}, | |
152 | }; | |
153 | ||
abbce6e2 | 154 | static struct of_platform_driver power_driver = { |
a2bd4fd1 DM |
155 | .name = "power", |
156 | .match_table = power_match, | |
abbce6e2 | 157 | .probe = power_probe, |
a2bd4fd1 DM |
158 | }; |
159 | ||
160 | void __init power_init(void) | |
161 | { | |
abbce6e2 | 162 | of_register_driver(&power_driver, &of_bus_type); |
a2bd4fd1 DM |
163 | return; |
164 | } | |
1da177e4 | 165 | #endif /* CONFIG_PCI */ |