/arch/mips/sgi-ip22/ip22-reset.c
https://bitbucket.org/evzijst/gittest · C · 247 lines · 170 code · 46 blank · 31 comment · 19 complexity · f91fdd123f9087085a7f025095f05044 MD5 · raw file
- /*
- * 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, 2003 by Ralf Baechle
- */
- #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/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 paniced.
- */
- #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 = 0;
- static void sgi_machine_restart(char *command) __attribute__((noreturn));
- static void sgi_machine_halt(void) __attribute__((noreturn));
- static void sgi_machine_power_off(void) __attribute__((noreturn));
- static void sgi_machine_restart(char *command)
- {
- if (machine_state & MACHINE_SHUTTING_DOWN)
- sgi_machine_power_off();
- sgimc->cpuctrl0 |= SGIMC_CCTRL0_SYSINIT;
- while (1);
- }
- static void sgi_machine_halt(void)
- {
- if (machine_state & MACHINE_SHUTTING_DOWN)
- sgi_machine_power_off();
- ArcEnterInteractiveMode();
- }
- static void 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 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 + 5; /* 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_proc(1,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 + 1;
- 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 + 1;
- add_timer(&volume_timer);
- }
- }
- static irqreturn_t panel_int(int irq, void *dev_id, struct pt_regs *regs)
- {
- 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 + 1;
- 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 + 1;
- 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)
- {
- _machine_restart = sgi_machine_restart;
- _machine_halt = sgi_machine_halt;
- _machine_power_off = sgi_machine_power_off;
- request_irq(SGI_PANEL_IRQ, panel_int, 0, "Front Panel", NULL);
- init_timer(&blink_timer);
- blink_timer.function = blink_timeout;
- notifier_chain_register(&panic_notifier_list, &panic_block);
- return 0;
- }
- subsys_initcall(reboot_setup);