[deliverable/linux.git] / arch / sparc64 / kernel / power.c

/* $Id: power.c,v 1.10 2001/12/11 01:57:16 davem Exp $
 * power.c: Power management driver.
 *
 * Copyright (C) 1999 David S. Miller (davem@redhat.com)
 */

#define __KERNEL_SYSCALLS__

#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/signal.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/pm.h>

#include <asm/system.h>
#include <asm/ebus.h>
#include <asm/isa.h>
#include <asm/auxio.h>

#include <linux/unistd.h>

/*
 * sysctl - toggle power-off restriction for serial console 
 * systems in machine_power_off()
 */
int scons_pwroff = 1; 

#ifdef CONFIG_PCI
static void __iomem *power_reg;

static DECLARE_WAIT_QUEUE_HEAD(powerd_wait);
static int button_pressed;

static irqreturn_t power_handler(int irq, void *dev_id, struct pt_regs *regs)
{
	if (button_pressed == 0) {
		button_pressed = 1;
		wake_up(&powerd_wait);
	}

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

extern void machine_halt(void);
extern void machine_alt_power_off(void);
static void (*poweroff_method)(void) = machine_alt_power_off;

void machine_power_off(void)
{
	if (!serial_console || scons_pwroff) {
#ifdef CONFIG_PCI
		if (power_reg) {
			/* Both register bits seem to have the
			 * same effect, so until I figure out
			 * what the difference is...
			 */
			writel(AUXIO_PCIO_CPWR_OFF | AUXIO_PCIO_SPWR_OFF, power_reg);
		} else
#endif /* CONFIG_PCI */
			if (poweroff_method != NULL) {
				poweroff_method();
				/* not reached */
			}
	}
	machine_halt();
}

void (*pm_power_off)(void) = machine_power_off;
EXPORT_SYMBOL(pm_power_off);

#ifdef CONFIG_PCI
static int powerd(void *__unused)
{
	static char *envp[] = { "HOME=/", "TERM=linux", "PATH=/sbin:/usr/sbin:/bin:/usr/bin", NULL };
	char *argv[] = { "/sbin/shutdown", "-h", "now", NULL };
	DECLARE_WAITQUEUE(wait, current);

	daemonize("powerd");

	add_wait_queue(&powerd_wait, &wait);
again:
	for (;;) {
		set_task_state(current, TASK_INTERRUPTIBLE);
		if (button_pressed)
			break;
		flush_signals(current);
		schedule();
	}
	__set_current_state(TASK_RUNNING);
	remove_wait_queue(&powerd_wait, &wait);

	/* Ok, down we go... */
	button_pressed = 0;
	if (execve("/sbin/shutdown", argv, envp) < 0) {
		printk("powerd: shutdown execution failed\n");
		add_wait_queue(&powerd_wait, &wait);
		goto again;
	}
	return 0;
}

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

	return 1;
}

static int __init power_probe_ebus(struct resource **resp, unsigned int *irq_p, struct device_node **prom_node_p)
{
	struct linux_ebus *ebus;
	struct linux_ebus_device *edev;

	for_each_ebus(ebus) {
		for_each_ebusdev(edev, ebus) {
			if (!strcmp(edev->prom_node->name, "power")) {
				*resp = &edev->resource[0];
				*irq_p = edev->irqs[0];
				*prom_node_p = edev->prom_node;
				return 0;
			}
		}
	}
	return -ENODEV;
}

static int __init power_probe_isa(struct resource **resp, unsigned int *irq_p, struct device_node **prom_node_p)
{
	struct sparc_isa_bridge *isa_bus;
	struct sparc_isa_device *isa_dev;

	for_each_isa(isa_bus) {
		for_each_isadev(isa_dev, isa_bus) {
			if (!strcmp(isa_dev->prom_node->name, "power")) {
				*resp = &isa_dev->resource;
				*irq_p = isa_dev->irq;
				*prom_node_p = isa_dev->prom_node;
				return 0;
			}
		}
	}
	return -ENODEV;
}

void __init power_init(void)
{
	struct resource *res = NULL;
	unsigned int irq;
	struct device_node *dp;
	static int invoked;

	if (invoked)
		return;
	invoked = 1;

	if (!power_probe_ebus(&res, &irq, &dp))
		goto found;

	if (!power_probe_isa(&res, &irq, &dp))
		goto found;

	return;

found:
	power_reg = ioremap(res->start, 0x4);
	printk("power: Control reg at %p ... ", power_reg);
	poweroff_method = machine_halt;  /* able to use the standard halt */
	if (has_button_interrupt(irq, dp)) {
		if (kernel_thread(powerd, NULL, CLONE_FS) < 0) {
			printk("Failed to start power daemon.\n");
			return;
		}
		printk("powerd running.\n");

		if (request_irq(irq,
				power_handler, SA_SHIRQ, "power", NULL) < 0)
			printk("power: Error, cannot register IRQ handler.\n");
	} else {
		printk("not using powerd.\n");
	}
}
#endif /* CONFIG_PCI */
Commit	Line	Data
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
bb49bcda DM	7	#define __KERNEL_SYSCALLS__
bb49bcda DM	8
1da177e4 LT	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>
90bf8116	17	#include <linux/pm.h>
1da177e4 LT	18
	19	#include <asm/system.h>
	20	#include <asm/ebus.h>
2256c13b	21	#include <asm/isa.h>
1da177e4 LT	22	#include <asm/auxio.h>
1da177e4 LT	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
	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
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;
	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
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
690c8fd3	118	static int __init power_probe_ebus(struct resource *resp, unsigned int irq_p, struct device_node **prom_node_p)
1da177e4 LT	119	{
	120	struct linux_ebus *ebus;
	121	struct linux_ebus_device *edev;
2256c13b DM	122
	123	for_each_ebus(ebus) {
	124	for_each_ebusdev(edev, ebus) {
690c8fd3	125	if (!strcmp(edev->prom_node->name, "power")) {
2256c13b DM	126	*resp = &edev->resource[0];
	127	*irq_p = edev->irqs[0];
	128	*prom_node_p = edev->prom_node;
	129	return 0;
	130	}
	131	}
	132	}
	133	return -ENODEV;
	134	}
	135
690c8fd3	136	static int __init power_probe_isa(struct resource *resp, unsigned int irq_p, struct device_node **prom_node_p)
2256c13b DM	137	{
	138	struct sparc_isa_bridge *isa_bus;
	139	struct sparc_isa_device *isa_dev;
	140
	141	for_each_isa(isa_bus) {
	142	for_each_isadev(isa_dev, isa_bus) {
690c8fd3	143	if (!strcmp(isa_dev->prom_node->name, "power")) {
2256c13b DM	144	*resp = &isa_dev->resource;
	145	*irq_p = isa_dev->irq;
	146	*prom_node_p = isa_dev->prom_node;
	147	return 0;
	148	}
	149	}
	150	}
	151	return -ENODEV;
	152	}
	153
	154	void __init power_init(void)
	155	{
	156	struct resource *res = NULL;
	157	unsigned int irq;
690c8fd3	158	struct device_node *dp;
1da177e4 LT	159	static int invoked;
	160
	161	if (invoked)
	162	return;
	163	invoked = 1;
	164
690c8fd3	165	if (!power_probe_ebus(&res, &irq, &dp))
2256c13b DM	166	goto found;
2256c13b DM	167
690c8fd3	168	if (!power_probe_isa(&res, &irq, &dp))
2256c13b DM	169	goto found;
2256c13b DM	170
1da177e4 LT	171	return;
	172
	173	found:
2256c13b	174	power_reg = ioremap(res->start, 0x4);
1da177e4 LT	175	printk("power: Control reg at %p ... ", power_reg);
1da177e4 LT	176	poweroff_method = machine_halt; /* able to use the standard halt */
690c8fd3	177	if (has_button_interrupt(irq, dp)) {
1da177e4 LT	178	if (kernel_thread(powerd, NULL, CLONE_FS) < 0) {
	179	printk("Failed to start power daemon.\n");
	180	return;
	181	}
	182	printk("powerd running.\n");
	183
2256c13b	184	if (request_irq(irq,
1da177e4 LT	185	power_handler, SA_SHIRQ, "power", NULL) < 0)
	186	printk("power: Error, cannot register IRQ handler.\n");
	187	} else {
	188	printk("not using powerd.\n");
	189	}
	190	}
	191	#endif /* CONFIG_PCI */