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/*
* linux/arch/parisc/kernel/power.c
* HP PARISC powerfail and soft power switch support
*
* Copyright (C) 2001 Helge Deller <deller@gmx.de>
*
*/
/*
* Status: EXPERIMENTAL
*
* TODO:
* - use tasklets instead of calling it from the timer-interrupt function
* - after a special amount of time just turn the machine off (killing init may have failed!)
* - ....
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/reboot.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <asm/gsc.h>
#include <asm/pdc.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/led.h>
/* For kernel debugging purposes it's sometimes better to have
* the soft-power switch killing the power at once.
* This may be reached by uncommenting the following line: */
//#define POWERSWITCH_DISABLED
/* local time-counter for shutdown */
static int shutdown_timer;
#define DIAG_CODE(code) (0x14000000 + ((code)<<5))
/* this will go to processor.h or any other place... */
/* taken from PCXL ERS page 82 */
#define MFCPU_X(rDiagReg, t_ch, t_th, code) \
(DIAG_CODE(code) + ((rDiagReg)<<21) + ((t_ch)<<16) + ((t_th)<<0) )
#define MTCPU(dr, gr) MFCPU_X(dr, gr, 0, 0x12) /* move value of gr to dr[dr] */
#define MFCPU_C(dr, gr) MFCPU_X(dr, gr, 0, 0x30) /* for dr0 and dr8 only ! */
#define MFCPU_T(dr, gr) MFCPU_X(dr, 0, gr, 0xa0) /* all dr except dr0 and dr8 */
#define __getDIAG(dr) ( { \
register unsigned long __res asm("r28");\
__asm__ __volatile__ ( \
".word %1\n nop\n" : "=&r" (__res) : "i" (MFCPU_T(dr,28)) \
); \
__res; \
} )
static void deferred_poweroff(void *dummy)
{
extern int cad_pid; /* kernel/sys.c */
kill_proc(cad_pid, SIGINT, 1);
/* machine_power_off(); */
}
/*
* This function gets called from interrupt context.
* As it's called within an interrupt, it wouldn't sync if we don't
* use schedule_task().
*/
static void poweroff(void)
{
static int powering_off;
static struct tq_struct poweroff_tq = {
routine: deferred_poweroff,
};
if (powering_off)
return;
powering_off++;
schedule_task(&poweroff_tq);
}
/* check, give feedback and start shutdown after one second */
static void process_shutdown(void)
{
if (shutdown_timer == 0)
printk(KERN_INFO "Shutdown requested...\n");
shutdown_timer++;
/* wait until the button was pressed for 1 second */
if (shutdown_timer == HZ) {
static char msg[] = "Shutting down...";
printk(KERN_INFO "%s\n", msg);
#ifdef CONFIG_CHASSIS_LCD_LED
lcd_print(msg);
#endif
poweroff();
}
}
/* soft power switch function ptr */
void (*check_soft_power)(void);
/*
* On gecko style machines (e.g. 712/xx and 715/xx)
* the power switch status is stored in Bit 0 ("the highest bit")
* of CPU diagnose register 25.
*
*/
static void check_soft_power_gecko(void)
{
if (__getDIAG(25) & 0x80000000) {
/* power switch button not pressed or released again */
shutdown_timer = 0;
} else {
process_shutdown();
}
}
/*
* Check the power switch status which is read from the
* real I/O location at soft_power_reg.
* Bit 31 ("the lowest bit) is the status of the power switch.
*/
static unsigned long soft_power_reg;
static void check_soft_power_polling(void)
{
unsigned long current_status;
current_status = gsc_readl(soft_power_reg);
if (current_status & 0x1) {
/* power switch button not pressed */
shutdown_timer = 0;
} else {
process_shutdown();
}
}
/*
* powerfail interruption handler (irq IRQ_FROM_REGION(CPU_IRQ_REGION)+2)
*/
#if 0
static void powerfail_interrupt(int code, void *x, struct pt_regs *regs)
{
printk(KERN_CRIT "POWERFAIL INTERRUPTION !\n");
poweroff();
}
#endif
static int __init power_init(void)
{
unsigned long ret;
#if 0
request_irq( IRQ_FROM_REGION(CPU_IRQ_REGION)+2, &powerfail_interrupt,
0, "powerfail", NULL);
#endif
#if !defined(POWERSWITCH_DISABLED)
/* enable the soft power switch if possible */
ret = pdc_soft_power_info(&soft_power_reg);
if (ret != PDC_OK)
return 0;
switch ((long) soft_power_reg) {
case 0: printk(KERN_INFO "Enabled gecko-style soft power switch.\n");
check_soft_power = check_soft_power_gecko;
break;
case -1: printk(KERN_INFO "No soft power switch support.\n");
break;
default: printk(KERN_INFO "Enabled soft power switch (polling mode, io=0x%08lx).\n",
soft_power_reg);
check_soft_power = check_soft_power_polling;
}
#endif
return 0;
}
module_init(power_init);
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