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/* power.c: Power management driver.
*
* Copyright (C) 1999, 2007 David S. Miller (davem@davemloft.net)
*/
#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 <linux/syscalls.h>
#include <linux/reboot.h>
#include <asm/system.h>
#include <asm/auxio.h>
#include <asm/prom.h>
#include <asm/of_device.h>
#include <asm/io.h>
#include <asm/sstate.h>
#include <linux/unistd.h>
/*
* sysctl - toggle power-off restriction for serial console
* systems in machine_power_off()
*/
int scons_pwroff = 1;
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;
}
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)
{
sstate_poweroff();
if (!serial_console || scons_pwroff) {
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 {
if (poweroff_method != NULL) {
poweroff_method();
/* not reached */
}
}
}
machine_halt();
}
void (*pm_power_off)(void) = machine_power_off;
EXPORT_SYMBOL(pm_power_off);
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);
poweroff_method = machine_halt; /* able to use the standard halt */
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 power_match[] = {
{
.name = "power",
},
{},
};
static struct of_platform_driver power_driver = {
.name = "power",
.match_table = power_match,
.probe = power_probe,
};
void __init power_init(void)
{
of_register_driver(&power_driver, &of_platform_bus_type);
return;
}
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