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ip22-reset.c

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1997, 1998, 2001, 03, 05, 06 by Ralf Baechle
 */
#include <linux/linkage.h>
#include <linux/init.h>
#include <linux/ds1286.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/notifier.h>
#include <linux/pm.h>
#include <linux/timer.h>

#include <asm/io.h>
#include <asm/irq.h>
#include <asm/system.h>
#include <asm/reboot.h>
#include <asm/sgialib.h>
#include <asm/sgi/ioc.h>
#include <asm/sgi/hpc3.h>
#include <asm/sgi/mc.h>
#include <asm/sgi/ip22.h>

/*
 * Just powerdown if init hasn't done after POWERDOWN_TIMEOUT seconds.
 * I'm not sure if this feature is a good idea, for now it's here just to
 * make the power button make behave just like under IRIX.
 */
#define POWERDOWN_TIMEOUT     120

/*
 * Blink frequency during reboot grace period and when panicked.
 */
#define POWERDOWN_FREQ        (HZ / 4)
#define PANIC_FREQ            (HZ / 8)

static struct timer_list power_timer, blink_timer, debounce_timer, volume_timer;

#define MACHINE_PANICED       1
#define MACHINE_SHUTTING_DOWN 2

static int machine_state;

static void __noreturn sgi_machine_power_off(void)
{
      unsigned int tmp;

      local_irq_disable();

      /* Disable watchdog */
      tmp = hpc3c0->rtcregs[RTC_CMD] & 0xff;
      hpc3c0->rtcregs[RTC_CMD] = tmp | RTC_WAM;
      hpc3c0->rtcregs[RTC_WSEC] = 0;
      hpc3c0->rtcregs[RTC_WHSEC] = 0;

      while (1) {
            sgioc->panel = ~SGIOC_PANEL_POWERON;
            /* Good bye cruel world ...  */

            /* If we're still running, we probably got sent an alarm
               interrupt.  Read the flag to clear it.  */
            tmp = hpc3c0->rtcregs[RTC_HOURS_ALARM];
      }
}

static void __noreturn sgi_machine_restart(char *command)
{
      if (machine_state & MACHINE_SHUTTING_DOWN)
            sgi_machine_power_off();
      sgimc->cpuctrl0 |= SGIMC_CCTRL0_SYSINIT;
      while (1);
}

static void __noreturn sgi_machine_halt(void)
{
      if (machine_state & MACHINE_SHUTTING_DOWN)
            sgi_machine_power_off();
      ArcEnterInteractiveMode();
}

static void power_timeout(unsigned long data)
{
      sgi_machine_power_off();
}

static void blink_timeout(unsigned long data)
{
      /* XXX fix this for fullhouse  */
      sgi_ioc_reset ^= (SGIOC_RESET_LC0OFF|SGIOC_RESET_LC1OFF);
      sgioc->reset = sgi_ioc_reset;

      mod_timer(&blink_timer, jiffies + data);
}

static void debounce(unsigned long data)
{
      del_timer(&debounce_timer);
      if (sgint->istat1 & SGINT_ISTAT1_PWR) {
            /* Interrupt still being sent. */
            debounce_timer.expires = jiffies + (HZ / 20); /* 0.05s  */
            add_timer(&debounce_timer);

            sgioc->panel = SGIOC_PANEL_POWERON | SGIOC_PANEL_POWERINTR |
                         SGIOC_PANEL_VOLDNINTR | SGIOC_PANEL_VOLDNHOLD |
                         SGIOC_PANEL_VOLUPINTR | SGIOC_PANEL_VOLUPHOLD;

            return;
      }

      if (machine_state & MACHINE_PANICED)
            sgimc->cpuctrl0 |= SGIMC_CCTRL0_SYSINIT;

      enable_irq(SGI_PANEL_IRQ);
}

static inline void power_button(void)
{
      if (machine_state & MACHINE_PANICED)
            return;

      if ((machine_state & MACHINE_SHUTTING_DOWN) ||
                  kill_cad_pid(SIGINT, 1)) {
            /* No init process or button pressed twice.  */
            sgi_machine_power_off();
      }

      machine_state |= MACHINE_SHUTTING_DOWN;
      blink_timer.data = POWERDOWN_FREQ;
      blink_timeout(POWERDOWN_FREQ);

      init_timer(&power_timer);
      power_timer.function = power_timeout;
      power_timer.expires = jiffies + POWERDOWN_TIMEOUT * HZ;
      add_timer(&power_timer);
}

void (*indy_volume_button)(int) = NULL;

EXPORT_SYMBOL(indy_volume_button);

static inline void volume_up_button(unsigned long data)
{
      del_timer(&volume_timer);

      if (indy_volume_button)
            indy_volume_button(1);

      if (sgint->istat1 & SGINT_ISTAT1_PWR) {
            volume_timer.expires = jiffies + (HZ / 100);
            add_timer(&volume_timer);
      }
}

static inline void volume_down_button(unsigned long data)
{
      del_timer(&volume_timer);

      if (indy_volume_button)
            indy_volume_button(-1);

      if (sgint->istat1 & SGINT_ISTAT1_PWR) {
            volume_timer.expires = jiffies + (HZ / 100);
            add_timer(&volume_timer);
      }
}

static irqreturn_t panel_int(int irq, void *dev_id)
{
      unsigned int buttons;

      buttons = sgioc->panel;
      sgioc->panel = SGIOC_PANEL_POWERON | SGIOC_PANEL_POWERINTR;

      if (sgint->istat1 & SGINT_ISTAT1_PWR) {
            /* Wait until interrupt goes away */
            disable_irq(SGI_PANEL_IRQ);
            init_timer(&debounce_timer);
            debounce_timer.function = debounce;
            debounce_timer.expires = jiffies + 5;
            add_timer(&debounce_timer);
      }

      /* Power button was pressed
       * ioc.ps page 22: "The Panel Register is called Power Control by Full
       * House. Only lowest 2 bits are used. Guiness uses upper four bits
       * for volume control". This is not true, all bits are pulled high
       * on fullhouse */
      if (ip22_is_fullhouse() || !(buttons & SGIOC_PANEL_POWERINTR)) {
            power_button();
            return IRQ_HANDLED;
      }
      /* TODO: mute/unmute */
      /* Volume up button was pressed */
      if (!(buttons & SGIOC_PANEL_VOLUPINTR)) {
            init_timer(&volume_timer);
            volume_timer.function = volume_up_button;
            volume_timer.expires = jiffies + (HZ / 100);
            add_timer(&volume_timer);
      }
      /* Volume down button was pressed */
      if (!(buttons & SGIOC_PANEL_VOLDNINTR)) {
            init_timer(&volume_timer);
            volume_timer.function = volume_down_button;
            volume_timer.expires = jiffies + (HZ / 100);
            add_timer(&volume_timer);
      }

      return IRQ_HANDLED;
}

static int panic_event(struct notifier_block *this, unsigned long event,
                      void *ptr)
{
      if (machine_state & MACHINE_PANICED)
            return NOTIFY_DONE;
      machine_state |= MACHINE_PANICED;

      blink_timer.data = PANIC_FREQ;
      blink_timeout(PANIC_FREQ);

      return NOTIFY_DONE;
}

static struct notifier_block panic_block = {
      .notifier_call    = panic_event,
};

static int __init reboot_setup(void)
{
      int res;

      _machine_restart = sgi_machine_restart;
      _machine_halt = sgi_machine_halt;
      pm_power_off = sgi_machine_power_off;

      res = request_irq(SGI_PANEL_IRQ, panel_int, 0, "Front Panel", NULL);
      if (res) {
            printk(KERN_ERR "Allocation of front panel IRQ failed\n");
            return res;
      }

      init_timer(&blink_timer);
      blink_timer.function = blink_timeout;
      atomic_notifier_chain_register(&panic_notifier_list, &panic_block);

      return 0;
}

subsys_initcall(reboot_setup);

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