diff options
Diffstat (limited to 'arch/mips/sgi-ip22/ip22-reset.c')
| -rw-r--r-- | arch/mips/sgi-ip22/ip22-reset.c | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/arch/mips/sgi-ip22/ip22-reset.c b/arch/mips/sgi-ip22/ip22-reset.c new file mode 100644 index 000000000..c374f3cee --- /dev/null +++ b/arch/mips/sgi-ip22/ip22-reset.c @@ -0,0 +1,203 @@ +/* + * 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/rtc/ds1286.h> +#include <linux/interrupt.h> +#include <linux/kernel.h> +#include <linux/sched/signal.h> +#include <linux/notifier.h> +#include <linux/pm.h> +#include <linux/timer.h> + +#include <asm/io.h> +#include <asm/irq.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; +static unsigned long blink_timer_timeout; + +#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(struct timer_list *unused) +{ + sgi_machine_power_off(); +} + +static void blink_timeout(struct timer_list *unused) +{ + /* XXX fix this for fullhouse */ + sgi_ioc_reset ^= (SGIOC_RESET_LC0OFF|SGIOC_RESET_LC1OFF); + sgioc->reset = sgi_ioc_reset; + + mod_timer(&blink_timer, jiffies + blink_timer_timeout); +} + +static void debounce(struct timer_list *unused) +{ + 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_timeout = POWERDOWN_FREQ; + blink_timeout(&blink_timer); + + timer_setup(&power_timer, power_timeout, 0); + power_timer.expires = jiffies + POWERDOWN_TIMEOUT * HZ; + add_timer(&power_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_nosync(SGI_PANEL_IRQ); + timer_setup(&debounce_timer, debounce, 0); + 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 (!(buttons & SGIOC_PANEL_POWERINTR)) + power_button(); + + 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_timeout = PANIC_FREQ; + blink_timeout(&blink_timer); + + 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; + } + + timer_setup(&blink_timer, blink_timeout, 0); + atomic_notifier_chain_register(&panic_notifier_list, &panic_block); + + return 0; +} + +subsys_initcall(reboot_setup); |