2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
6 * Copyright (C) 1997, 1998, 2001, 03, 05, 06 by Ralf Baechle
8 #include <linux/linkage.h>
9 #include <linux/init.h>
10 #include <linux/rtc/ds1286.h>
11 #include <linux/interrupt.h>
12 #include <linux/kernel.h>
13 #include <linux/sched.h>
14 #include <linux/notifier.h>
16 #include <linux/timer.h>
20 #include <asm/reboot.h>
21 #include <asm/sgialib.h>
22 #include <asm/sgi/ioc.h>
23 #include <asm/sgi/hpc3.h>
24 #include <asm/sgi/mc.h>
25 #include <asm/sgi/ip22.h>
28 * Just powerdown if init hasn't done after POWERDOWN_TIMEOUT seconds.
29 * I'm not sure if this feature is a good idea, for now it's here just to
30 * make the power button make behave just like under IRIX.
32 #define POWERDOWN_TIMEOUT 120
35 * Blink frequency during reboot grace period and when panicked.
37 #define POWERDOWN_FREQ (HZ / 4)
38 #define PANIC_FREQ (HZ / 8)
40 static struct timer_list power_timer, blink_timer, debounce_timer;
42 #define MACHINE_PANICED 1
43 #define MACHINE_SHUTTING_DOWN 2
45 static int machine_state;
47 static void __noreturn sgi_machine_power_off(void)
53 /* Disable watchdog */
54 tmp = hpc3c0->rtcregs[RTC_CMD] & 0xff;
55 hpc3c0->rtcregs[RTC_CMD] = tmp | RTC_WAM;
56 hpc3c0->rtcregs[RTC_WSEC] = 0;
57 hpc3c0->rtcregs[RTC_WHSEC] = 0;
60 sgioc->panel = ~SGIOC_PANEL_POWERON;
61 /* Good bye cruel world ... */
63 /* If we're still running, we probably got sent an alarm
64 interrupt. Read the flag to clear it. */
65 tmp = hpc3c0->rtcregs[RTC_HOURS_ALARM];
69 static void __noreturn sgi_machine_restart(char *command)
71 if (machine_state & MACHINE_SHUTTING_DOWN)
72 sgi_machine_power_off();
73 sgimc->cpuctrl0 |= SGIMC_CCTRL0_SYSINIT;
77 static void __noreturn sgi_machine_halt(void)
79 if (machine_state & MACHINE_SHUTTING_DOWN)
80 sgi_machine_power_off();
81 ArcEnterInteractiveMode();
84 static void power_timeout(unsigned long data)
86 sgi_machine_power_off();
89 static void blink_timeout(unsigned long data)
91 /* XXX fix this for fullhouse */
92 sgi_ioc_reset ^= (SGIOC_RESET_LC0OFF|SGIOC_RESET_LC1OFF);
93 sgioc->reset = sgi_ioc_reset;
95 mod_timer(&blink_timer, jiffies + data);
98 static void debounce(unsigned long data)
100 del_timer(&debounce_timer);
101 if (sgint->istat1 & SGINT_ISTAT1_PWR) {
102 /* Interrupt still being sent. */
103 debounce_timer.expires = jiffies + (HZ / 20); /* 0.05s */
104 add_timer(&debounce_timer);
106 sgioc->panel = SGIOC_PANEL_POWERON | SGIOC_PANEL_POWERINTR |
107 SGIOC_PANEL_VOLDNINTR | SGIOC_PANEL_VOLDNHOLD |
108 SGIOC_PANEL_VOLUPINTR | SGIOC_PANEL_VOLUPHOLD;
113 if (machine_state & MACHINE_PANICED)
114 sgimc->cpuctrl0 |= SGIMC_CCTRL0_SYSINIT;
116 enable_irq(SGI_PANEL_IRQ);
119 static inline void power_button(void)
121 if (machine_state & MACHINE_PANICED)
124 if ((machine_state & MACHINE_SHUTTING_DOWN) ||
125 kill_cad_pid(SIGINT, 1)) {
126 /* No init process or button pressed twice. */
127 sgi_machine_power_off();
130 machine_state |= MACHINE_SHUTTING_DOWN;
131 blink_timer.data = POWERDOWN_FREQ;
132 blink_timeout(POWERDOWN_FREQ);
134 init_timer(&power_timer);
135 power_timer.function = power_timeout;
136 power_timer.expires = jiffies + POWERDOWN_TIMEOUT * HZ;
137 add_timer(&power_timer);
140 static irqreturn_t panel_int(int irq, void *dev_id)
142 unsigned int buttons;
144 buttons = sgioc->panel;
145 sgioc->panel = SGIOC_PANEL_POWERON | SGIOC_PANEL_POWERINTR;
147 if (sgint->istat1 & SGINT_ISTAT1_PWR) {
148 /* Wait until interrupt goes away */
149 disable_irq_nosync(SGI_PANEL_IRQ);
150 init_timer(&debounce_timer);
151 debounce_timer.function = debounce;
152 debounce_timer.expires = jiffies + 5;
153 add_timer(&debounce_timer);
156 /* Power button was pressed
157 * ioc.ps page 22: "The Panel Register is called Power Control by Full
158 * House. Only lowest 2 bits are used. Guiness uses upper four bits
159 * for volume control". This is not true, all bits are pulled high
161 if (!(buttons & SGIOC_PANEL_POWERINTR))
167 static int panic_event(struct notifier_block *this, unsigned long event,
170 if (machine_state & MACHINE_PANICED)
172 machine_state |= MACHINE_PANICED;
174 blink_timer.data = PANIC_FREQ;
175 blink_timeout(PANIC_FREQ);
180 static struct notifier_block panic_block = {
181 .notifier_call = panic_event,
184 static int __init reboot_setup(void)
188 _machine_restart = sgi_machine_restart;
189 _machine_halt = sgi_machine_halt;
190 pm_power_off = sgi_machine_power_off;
192 res = request_irq(SGI_PANEL_IRQ, panel_int, 0, "Front Panel", NULL);
194 printk(KERN_ERR "Allocation of front panel IRQ failed\n");
198 init_timer(&blink_timer);
199 blink_timer.function = blink_timeout;
200 atomic_notifier_chain_register(&panic_notifier_list, &panic_block);
205 subsys_initcall(reboot_setup);