summaryrefslogtreecommitdiffstats
path: root/arch/sparc64/kernel/power.c
blob: 076cad7f975766aaae812714de7613452d2978cf (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
/* power.c: Power management driver.
 *
 * Copyright (C) 1999, 2007, 2008 David S. Miller (davem@davemloft.net)
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/reboot.h>
#include <linux/of_device.h>

#include <asm/prom.h>
#include <asm/io.h>

static void __iomem *power_reg;

static irqreturn_t power_handler(int irq, void *dev_id)
{
	orderly_poweroff(true);

	/* FIXME: Check registers for status... */
	return IRQ_HANDLED;
}

static int __init has_button_interrupt(unsigned int irq, struct device_node *dp)
{
	if (irq == 0xffffffff)
		return 0;
	if (!of_find_property(dp, "button", NULL))
		return 0;

	return 1;
}

static int __devinit power_probe(struct of_device *op, const struct of_device_id *match)
{
	struct resource *res = &op->resource[0];
	unsigned int irq= op->irqs[0];

	power_reg = of_ioremap(res, 0, 0x4, "power");

	printk(KERN_INFO "%s: Control reg at %lx\n",
	       op->node->name, res->start);

	if (has_button_interrupt(irq, op->node)) {
		if (request_irq(irq,
				power_handler, 0, "power", NULL) < 0)
			printk(KERN_ERR "power: Cannot setup IRQ handler.\n");
	}

	return 0;
}

static struct of_device_id __initdata power_match[] = {
	{
		.name = "power",
	},
	{},
};

static struct of_platform_driver power_driver = {
	.match_table	= power_match,
	.probe		= power_probe,
	.driver		= {
		.name	= "power",
	},
};

static int __init power_init(void)
{
	return of_register_driver(&power_driver, &of_platform_bus_type);
}

device_initcall(power_init);