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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>
16#include <linux/pm.h>
17#include <linux/timer.h>
18
19#include <asm/io.h>
20#include <asm/irq.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>
28
29
30
31
32
33
34#define POWERDOWN_TIMEOUT 120
35
36
37
38
39#define POWERDOWN_FREQ (HZ / 4)
40#define PANIC_FREQ (HZ / 8)
41
42static struct timer_list power_timer, blink_timer, debounce_timer;
43
44#define MACHINE_PANICED 1
45#define MACHINE_SHUTTING_DOWN 2
46
47static int machine_state;
48
49static void __noreturn sgi_machine_power_off(void)
50{
51 unsigned int tmp;
52
53 local_irq_disable();
54
55
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;
60
61 while (1) {
62 sgioc->panel = ~SGIOC_PANEL_POWERON;
63
64
65
66
67 tmp = hpc3c0->rtcregs[RTC_HOURS_ALARM];
68 }
69}
70
71static void __noreturn sgi_machine_restart(char *command)
72{
73 if (machine_state & MACHINE_SHUTTING_DOWN)
74 sgi_machine_power_off();
75 sgimc->cpuctrl0 |= SGIMC_CCTRL0_SYSINIT;
76 while (1);
77}
78
79static void __noreturn sgi_machine_halt(void)
80{
81 if (machine_state & MACHINE_SHUTTING_DOWN)
82 sgi_machine_power_off();
83 ArcEnterInteractiveMode();
84}
85
86static void power_timeout(unsigned long data)
87{
88 sgi_machine_power_off();
89}
90
91static void blink_timeout(unsigned long data)
92{
93
94 sgi_ioc_reset ^= (SGIOC_RESET_LC0OFF|SGIOC_RESET_LC1OFF);
95 sgioc->reset = sgi_ioc_reset;
96
97 mod_timer(&blink_timer, jiffies + data);
98}
99
100static void debounce(unsigned long data)
101{
102 del_timer(&debounce_timer);
103 if (sgint->istat1 & SGINT_ISTAT1_PWR) {
104
105 debounce_timer.expires = jiffies + (HZ / 20);
106 add_timer(&debounce_timer);
107
108 sgioc->panel = SGIOC_PANEL_POWERON | SGIOC_PANEL_POWERINTR |
109 SGIOC_PANEL_VOLDNINTR | SGIOC_PANEL_VOLDNHOLD |
110 SGIOC_PANEL_VOLUPINTR | SGIOC_PANEL_VOLUPHOLD;
111
112 return;
113 }
114
115 if (machine_state & MACHINE_PANICED)
116 sgimc->cpuctrl0 |= SGIMC_CCTRL0_SYSINIT;
117
118 enable_irq(SGI_PANEL_IRQ);
119}
120
121static inline void power_button(void)
122{
123 if (machine_state & MACHINE_PANICED)
124 return;
125
126 if ((machine_state & MACHINE_SHUTTING_DOWN) ||
127 kill_cad_pid(SIGINT, 1)) {
128
129 sgi_machine_power_off();
130 }
131
132 machine_state |= MACHINE_SHUTTING_DOWN;
133 blink_timer.data = POWERDOWN_FREQ;
134 blink_timeout(POWERDOWN_FREQ);
135
136 init_timer(&power_timer);
137 power_timer.function = power_timeout;
138 power_timer.expires = jiffies + POWERDOWN_TIMEOUT * HZ;
139 add_timer(&power_timer);
140}
141
142static irqreturn_t panel_int(int irq, void *dev_id)
143{
144 unsigned int buttons;
145
146 buttons = sgioc->panel;
147 sgioc->panel = SGIOC_PANEL_POWERON | SGIOC_PANEL_POWERINTR;
148
149 if (sgint->istat1 & SGINT_ISTAT1_PWR) {
150
151 disable_irq_nosync(SGI_PANEL_IRQ);
152 init_timer(&debounce_timer);
153 debounce_timer.function = debounce;
154 debounce_timer.expires = jiffies + 5;
155 add_timer(&debounce_timer);
156 }
157
158
159
160
161
162
163 if (!(buttons & SGIOC_PANEL_POWERINTR))
164 power_button();
165
166 return IRQ_HANDLED;
167}
168
169static int panic_event(struct notifier_block *this, unsigned long event,
170 void *ptr)
171{
172 if (machine_state & MACHINE_PANICED)
173 return NOTIFY_DONE;
174 machine_state |= MACHINE_PANICED;
175
176 blink_timer.data = PANIC_FREQ;
177 blink_timeout(PANIC_FREQ);
178
179 return NOTIFY_DONE;
180}
181
182static struct notifier_block panic_block = {
183 .notifier_call = panic_event,
184};
185
186static int __init reboot_setup(void)
187{
188 int res;
189
190 _machine_restart = sgi_machine_restart;
191 _machine_halt = sgi_machine_halt;
192 pm_power_off = sgi_machine_power_off;
193
194 res = request_irq(SGI_PANEL_IRQ, panel_int, 0, "Front Panel", NULL);
195 if (res) {
196 printk(KERN_ERR "Allocation of front panel IRQ failed\n");
197 return res;
198 }
199
200 init_timer(&blink_timer);
201 blink_timer.function = blink_timeout;
202 atomic_notifier_chain_register(&panic_notifier_list, &panic_block);
203
204 return 0;
205}
206
207subsys_initcall(reboot_setup);
208