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
);