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/ds1286.h>
11 #include <linux/module.h>
12 #include <linux/interrupt.h>
13 #include <linux/kernel.h>
14 #include <linux/sched.h>
15 #include <linux/notifier.h>
17 #include <linux/timer.h>
21 #include <asm/system.h>
22 #include <asm/reboot.h>
23 #include <asm/sgialib.h>
24 #include <asm/sgi/ioc.h>
25 #include <asm/sgi/hpc3.h>
26 #include <asm/sgi/mc.h>
27 #include <asm/sgi/ip22.h>
30 * Just powerdown if init hasn't done after POWERDOWN_TIMEOUT seconds.
31 * I'm not sure if this feature is a good idea, for now it's here just to
32 * make the power button make behave just like under IRIX.
34 #define POWERDOWN_TIMEOUT 120
37 * Blink frequency during reboot grace period and when panicked.
39 #define POWERDOWN_FREQ (HZ / 4)
40 #define PANIC_FREQ (HZ / 8)
42 static struct timer_list power_timer, blink_timer, debounce_timer, volume_timer;
44 #define MACHINE_PANICED 1
45 #define MACHINE_SHUTTING_DOWN 2
47 static int machine_state;
49 static void __noreturn sgi_machine_power_off(void)
55 /* Disable watchdog */
56 tmp = hpc3c0->rtcregs[RTC_CMD] & 0xff;
57 hpc3c0->rtcregs[RTC_CMD] = tmp | RTC_WAM;
58 hpc3c0->rtcregs[RTC_WSEC] = 0;
59 hpc3c0->rtcregs[RTC_WHSEC] = 0;
62 sgioc->panel = ~SGIOC_PANEL_POWERON;
63 /* Good bye cruel world ... */
65 /* If we're still running, we probably got sent an alarm
66 interrupt. Read the flag to clear it. */
67 tmp = hpc3c0->rtcregs[RTC_HOURS_ALARM];
71 static void __noreturn sgi_machine_restart(char *command)
73 if (machine_state & MACHINE_SHUTTING_DOWN)
74 sgi_machine_power_off();
75 sgimc->cpuctrl0 |= SGIMC_CCTRL0_SYSINIT;
79 static void __noreturn sgi_machine_halt(void)
81 if (machine_state & MACHINE_SHUTTING_DOWN)
82 sgi_machine_power_off();
83 ArcEnterInteractiveMode();
86 static void power_timeout(unsigned long data)
88 sgi_machine_power_off();
91 static void blink_timeout(unsigned long data)
93 /* XXX fix this for fullhouse */
94 sgi_ioc_reset ^= (SGIOC_RESET_LC0OFF|SGIOC_RESET_LC1OFF);
95 sgioc->reset = sgi_ioc_reset;
97 mod_timer(&blink_timer, jiffies + data);
100 static void debounce(unsigned long data)
102 del_timer(&debounce_timer);
103 if (sgint->istat1 & SGINT_ISTAT1_PWR) {
104 /* Interrupt still being sent. */
105 debounce_timer.expires = jiffies + (HZ / 20); /* 0.05s */
106 add_timer(&debounce_timer);
108 sgioc->panel = SGIOC_PANEL_POWERON | SGIOC_PANEL_POWERINTR |
109 SGIOC_PANEL_VOLDNINTR | SGIOC_PANEL_VOLDNHOLD |
110 SGIOC_PANEL_VOLUPINTR | SGIOC_PANEL_VOLUPHOLD;
115 if (machine_state & MACHINE_PANICED)
116 sgimc->cpuctrl0 |= SGIMC_CCTRL0_SYSINIT;
118 enable_irq(SGI_PANEL_IRQ);
121 static inline void power_button(void)
123 if (machine_state & MACHINE_PANICED)
126 if ((machine_state & MACHINE_SHUTTING_DOWN) ||
127 kill_cad_pid(SIGINT, 1)) {
128 /* No init process or button pressed twice. */
129 sgi_machine_power_off();
132 machine_state |= MACHINE_SHUTTING_DOWN;
133 blink_timer.data = POWERDOWN_FREQ;
134 blink_timeout(POWERDOWN_FREQ);
136 init_timer(&power_timer);
137 power_timer.function = power_timeout;
138 power_timer.expires = jiffies + POWERDOWN_TIMEOUT * HZ;
139 add_timer(&power_timer);
142 void (*indy_volume_button)(int) = NULL;
144 EXPORT_SYMBOL(indy_volume_button);
146 static inline void volume_up_button(unsigned long data)
148 del_timer(&volume_timer);
150 if (indy_volume_button)
151 indy_volume_button(1);
153 if (sgint->istat1 & SGINT_ISTAT1_PWR) {
154 volume_timer.expires = jiffies + (HZ / 100);
155 add_timer(&volume_timer);
159 static inline void volume_down_button(unsigned long data)
161 del_timer(&volume_timer);
163 if (indy_volume_button)
164 indy_volume_button(-1);
166 if (sgint->istat1 & SGINT_ISTAT1_PWR) {
167 volume_timer.expires = jiffies + (HZ / 100);
168 add_timer(&volume_timer);
172 static irqreturn_t panel_int(int irq, void *dev_id)
174 unsigned int buttons;
176 buttons = sgioc->panel;
177 sgioc->panel = SGIOC_PANEL_POWERON | SGIOC_PANEL_POWERINTR;
179 if (sgint->istat1 & SGINT_ISTAT1_PWR) {
180 /* Wait until interrupt goes away */
181 disable_irq(SGI_PANEL_IRQ);
182 init_timer(&debounce_timer);
183 debounce_timer.function = debounce;
184 debounce_timer.expires = jiffies + 5;
185 add_timer(&debounce_timer);
188 /* Power button was pressed
189 * ioc.ps page 22: "The Panel Register is called Power Control by Full
190 * House. Only lowest 2 bits are used. Guiness uses upper four bits
191 * for volume control". This is not true, all bits are pulled high
193 if (ip22_is_fullhouse() || !(buttons & SGIOC_PANEL_POWERINTR)) {
197 /* TODO: mute/unmute */
198 /* Volume up button was pressed */
199 if (!(buttons & SGIOC_PANEL_VOLUPINTR)) {
200 init_timer(&volume_timer);
201 volume_timer.function = volume_up_button;
202 volume_timer.expires = jiffies + (HZ / 100);
203 add_timer(&volume_timer);
205 /* Volume down button was pressed */
206 if (!(buttons & SGIOC_PANEL_VOLDNINTR)) {
207 init_timer(&volume_timer);
208 volume_timer.function = volume_down_button;
209 volume_timer.expires = jiffies + (HZ / 100);
210 add_timer(&volume_timer);
216 static int panic_event(struct notifier_block *this, unsigned long event,
219 if (machine_state & MACHINE_PANICED)
221 machine_state |= MACHINE_PANICED;
223 blink_timer.data = PANIC_FREQ;
224 blink_timeout(PANIC_FREQ);
229 static struct notifier_block panic_block = {
230 .notifier_call = panic_event,
233 static int __init reboot_setup(void)
235 _machine_restart = sgi_machine_restart;
236 _machine_halt = sgi_machine_halt;
237 pm_power_off = sgi_machine_power_off;
239 request_irq(SGI_PANEL_IRQ, panel_int, 0, "Front Panel", NULL);
240 init_timer(&blink_timer);
241 blink_timer.function = blink_timeout;
242 atomic_notifier_chain_register(&panic_notifier_list, &panic_block);
247 subsys_initcall(reboot_setup);