Commit | Line | Data |
---|---|---|
13077d80 | 1 | /* power.c: Power management driver. |
1da177e4 | 2 | * |
13077d80 | 3 | * Copyright (C) 1999, 2007 David S. Miller (davem@davemloft.net) |
1da177e4 LT |
4 | */ |
5 | ||
1da177e4 LT |
6 | #include <linux/kernel.h> |
7 | #include <linux/module.h> | |
8 | #include <linux/init.h> | |
9 | #include <linux/sched.h> | |
10 | #include <linux/signal.h> | |
11 | #include <linux/delay.h> | |
12 | #include <linux/interrupt.h> | |
90bf8116 | 13 | #include <linux/pm.h> |
67608567 | 14 | #include <linux/syscalls.h> |
1da177e4 LT |
15 | |
16 | #include <asm/system.h> | |
1da177e4 | 17 | #include <asm/auxio.h> |
abbce6e2 DM |
18 | #include <asm/prom.h> |
19 | #include <asm/of_device.h> | |
20 | #include <asm/io.h> | |
13077d80 | 21 | #include <asm/power.h> |
22d6a1cb | 22 | #include <asm/sstate.h> |
1da177e4 | 23 | |
1da177e4 LT |
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 | ||
1da177e4 LT |
32 | static void __iomem *power_reg; |
33 | ||
34 | static DECLARE_WAIT_QUEUE_HEAD(powerd_wait); | |
35 | static int button_pressed; | |
36 | ||
13077d80 | 37 | void wake_up_powerd(void) |
1da177e4 LT |
38 | { |
39 | if (button_pressed == 0) { | |
40 | button_pressed = 1; | |
41 | wake_up(&powerd_wait); | |
42 | } | |
13077d80 DM |
43 | } |
44 | ||
45 | static irqreturn_t power_handler(int irq, void *dev_id) | |
46 | { | |
47 | wake_up_powerd(); | |
1da177e4 LT |
48 | |
49 | /* FIXME: Check registers for status... */ | |
50 | return IRQ_HANDLED; | |
51 | } | |
1da177e4 LT |
52 | |
53 | extern void machine_halt(void); | |
54 | extern void machine_alt_power_off(void); | |
55 | static void (*poweroff_method)(void) = machine_alt_power_off; | |
56 | ||
57 | void machine_power_off(void) | |
58 | { | |
22d6a1cb | 59 | sstate_poweroff(); |
1da177e4 | 60 | if (!serial_console || scons_pwroff) { |
1da177e4 LT |
61 | if (power_reg) { |
62 | /* Both register bits seem to have the | |
63 | * same effect, so until I figure out | |
64 | * what the difference is... | |
65 | */ | |
66 | writel(AUXIO_PCIO_CPWR_OFF | AUXIO_PCIO_SPWR_OFF, power_reg); | |
13077d80 | 67 | } else { |
1da177e4 LT |
68 | if (poweroff_method != NULL) { |
69 | poweroff_method(); | |
70 | /* not reached */ | |
71 | } | |
13077d80 | 72 | } |
1da177e4 LT |
73 | } |
74 | machine_halt(); | |
75 | } | |
76 | ||
90bf8116 DM |
77 | void (*pm_power_off)(void) = machine_power_off; |
78 | EXPORT_SYMBOL(pm_power_off); | |
79 | ||
1da177e4 LT |
80 | static int powerd(void *__unused) |
81 | { | |
82 | static char *envp[] = { "HOME=/", "TERM=linux", "PATH=/sbin:/usr/sbin:/bin:/usr/bin", NULL }; | |
83 | char *argv[] = { "/sbin/shutdown", "-h", "now", NULL }; | |
84 | DECLARE_WAITQUEUE(wait, current); | |
85 | ||
86 | daemonize("powerd"); | |
87 | ||
88 | add_wait_queue(&powerd_wait, &wait); | |
13077d80 | 89 | |
1da177e4 LT |
90 | for (;;) { |
91 | set_task_state(current, TASK_INTERRUPTIBLE); | |
92 | if (button_pressed) | |
93 | break; | |
94 | flush_signals(current); | |
95 | schedule(); | |
96 | } | |
97 | __set_current_state(TASK_RUNNING); | |
98 | remove_wait_queue(&powerd_wait, &wait); | |
99 | ||
100 | /* Ok, down we go... */ | |
101 | button_pressed = 0; | |
67608567 | 102 | if (kernel_execve("/sbin/shutdown", argv, envp) < 0) { |
13077d80 DM |
103 | printk(KERN_ERR "powerd: shutdown execution failed\n"); |
104 | machine_power_off(); | |
1da177e4 LT |
105 | } |
106 | return 0; | |
107 | } | |
108 | ||
13077d80 DM |
109 | int 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 | ||
690c8fd3 | 122 | static int __init has_button_interrupt(unsigned int irq, struct device_node *dp) |
1da177e4 | 123 | { |
13077d80 | 124 | if (irq == 0xffffffff) |
1da177e4 | 125 | return 0; |
690c8fd3 | 126 | if (!of_find_property(dp, "button", NULL)) |
1da177e4 LT |
127 | return 0; |
128 | ||
129 | return 1; | |
130 | } | |
131 | ||
abbce6e2 | 132 | static int __devinit power_probe(struct of_device *op, const struct of_device_id *match) |
1da177e4 | 133 | { |
abbce6e2 DM |
134 | struct resource *res = &op->resource[0]; |
135 | unsigned int irq= op->irqs[0]; | |
a2bd4fd1 | 136 | |
abbce6e2 DM |
137 | power_reg = of_ioremap(res, 0, 0x4, "power"); |
138 | ||
139 | printk("%s: Control reg at %lx ... ", | |
140 | op->node->name, res->start); | |
a2bd4fd1 | 141 | |
1da177e4 | 142 | poweroff_method = machine_halt; /* able to use the standard halt */ |
a2bd4fd1 | 143 | |
abbce6e2 | 144 | if (has_button_interrupt(irq, op->node)) { |
13077d80 | 145 | if (start_powerd() < 0) |
abbce6e2 | 146 | return 0; |
1da177e4 | 147 | |
2256c13b | 148 | if (request_irq(irq, |
00cde674 | 149 | power_handler, 0, "power", NULL) < 0) |
13077d80 | 150 | printk(KERN_ERR "power: Cannot setup IRQ handler.\n"); |
1da177e4 | 151 | } else { |
13077d80 | 152 | printk(KERN_INFO "power: Not using powerd.\n"); |
1da177e4 | 153 | } |
abbce6e2 DM |
154 | |
155 | return 0; | |
1da177e4 | 156 | } |
a2bd4fd1 DM |
157 | |
158 | static struct of_device_id power_match[] = { | |
159 | { | |
160 | .name = "power", | |
161 | }, | |
162 | {}, | |
163 | }; | |
164 | ||
abbce6e2 | 165 | static struct of_platform_driver power_driver = { |
a2bd4fd1 DM |
166 | .name = "power", |
167 | .match_table = power_match, | |
abbce6e2 | 168 | .probe = power_probe, |
a2bd4fd1 DM |
169 | }; |
170 | ||
171 | void __init power_init(void) | |
172 | { | |
37b7754a | 173 | of_register_driver(&power_driver, &of_platform_bus_type); |
a2bd4fd1 DM |
174 | return; |
175 | } |