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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/reboot.h>
22#include <asm/sgialib.h>
23#include <asm/sgi/ioc.h>
24#include <asm/sgi/hpc3.h>
25#include <asm/sgi/mc.h>
26#include <asm/sgi/ip22.h>
27
28
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30
31
32
33#define POWERDOWN_TIMEOUT 120
34
35
36
37
38#define POWERDOWN_FREQ (HZ / 4)
39#define PANIC_FREQ (HZ / 8)
40
41static struct timer_list power_timer, blink_timer, debounce_timer;
42
43#define MACHINE_PANICED 1
44#define MACHINE_SHUTTING_DOWN 2
45
46static int machine_state;
47
48static void __noreturn sgi_machine_power_off(void)
49{
50 unsigned int tmp;
51
52 local_irq_disable();
53
54
55 tmp = hpc3c0->rtcregs[RTC_CMD] & 0xff;
56 hpc3c0->rtcregs[RTC_CMD] = tmp | RTC_WAM;
57 hpc3c0->rtcregs[RTC_WSEC] = 0;
58 hpc3c0->rtcregs[RTC_WHSEC] = 0;
59
60 while (1) {
61 sgioc->panel = ~SGIOC_PANEL_POWERON;
62
63
64
65
66 tmp = hpc3c0->rtcregs[RTC_HOURS_ALARM];
67 }
68}
69
70static void __noreturn sgi_machine_restart(char *command)
71{
72 if (machine_state & MACHINE_SHUTTING_DOWN)
73 sgi_machine_power_off();
74 sgimc->cpuctrl0 |= SGIMC_CCTRL0_SYSINIT;
75 while (1);
76}
77
78static void __noreturn sgi_machine_halt(void)
79{
80 if (machine_state & MACHINE_SHUTTING_DOWN)
81 sgi_machine_power_off();
82 ArcEnterInteractiveMode();
83}
84
85static void power_timeout(unsigned long data)
86{
87 sgi_machine_power_off();
88}
89
90static void blink_timeout(unsigned long data)
91{
92
93 sgi_ioc_reset ^= (SGIOC_RESET_LC0OFF|SGIOC_RESET_LC1OFF);
94 sgioc->reset = sgi_ioc_reset;
95
96 mod_timer(&blink_timer, jiffies + data);
97}
98
99static void debounce(unsigned long data)
100{
101 del_timer(&debounce_timer);
102 if (sgint->istat1 & SGINT_ISTAT1_PWR) {
103
104 debounce_timer.expires = jiffies + (HZ / 20);
105 add_timer(&debounce_timer);
106
107 sgioc->panel = SGIOC_PANEL_POWERON | SGIOC_PANEL_POWERINTR |
108 SGIOC_PANEL_VOLDNINTR | SGIOC_PANEL_VOLDNHOLD |
109 SGIOC_PANEL_VOLUPINTR | SGIOC_PANEL_VOLUPHOLD;
110
111 return;
112 }
113
114 if (machine_state & MACHINE_PANICED)
115 sgimc->cpuctrl0 |= SGIMC_CCTRL0_SYSINIT;
116
117 enable_irq(SGI_PANEL_IRQ);
118}
119
120static inline void power_button(void)
121{
122 if (machine_state & MACHINE_PANICED)
123 return;
124
125 if ((machine_state & MACHINE_SHUTTING_DOWN) ||
126 kill_cad_pid(SIGINT, 1)) {
127
128 sgi_machine_power_off();
129 }
130
131 machine_state |= MACHINE_SHUTTING_DOWN;
132 blink_timer.data = POWERDOWN_FREQ;
133 blink_timeout(POWERDOWN_FREQ);
134
135 init_timer(&power_timer);
136 power_timer.function = power_timeout;
137 power_timer.expires = jiffies + POWERDOWN_TIMEOUT * HZ;
138 add_timer(&power_timer);
139}
140
141static irqreturn_t panel_int(int irq, void *dev_id)
142{
143 unsigned int buttons;
144
145 buttons = sgioc->panel;
146 sgioc->panel = SGIOC_PANEL_POWERON | SGIOC_PANEL_POWERINTR;
147
148 if (sgint->istat1 & SGINT_ISTAT1_PWR) {
149
150 disable_irq_nosync(SGI_PANEL_IRQ);
151 init_timer(&debounce_timer);
152 debounce_timer.function = debounce;
153 debounce_timer.expires = jiffies + 5;
154 add_timer(&debounce_timer);
155 }
156
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160
161
162 if (!(buttons & SGIOC_PANEL_POWERINTR))
163 power_button();
164
165 return IRQ_HANDLED;
166}
167
168static int panic_event(struct notifier_block *this, unsigned long event,
169 void *ptr)
170{
171 if (machine_state & MACHINE_PANICED)
172 return NOTIFY_DONE;
173 machine_state |= MACHINE_PANICED;
174
175 blink_timer.data = PANIC_FREQ;
176 blink_timeout(PANIC_FREQ);
177
178 return NOTIFY_DONE;
179}
180
181static struct notifier_block panic_block = {
182 .notifier_call = panic_event,
183};
184
185static int __init reboot_setup(void)
186{
187 int res;
188
189 _machine_restart = sgi_machine_restart;
190 _machine_halt = sgi_machine_halt;
191 pm_power_off = sgi_machine_power_off;
192
193 res = request_irq(SGI_PANEL_IRQ, panel_int, 0, "Front Panel", NULL);
194 if (res) {
195 printk(KERN_ERR "Allocation of front panel IRQ failed\n");
196 return res;
197 }
198
199 init_timer(&blink_timer);
200 blink_timer.function = blink_timeout;
201 atomic_notifier_chain_register(&panic_notifier_list, &panic_block);
202
203 return 0;
204}
205
206subsys_initcall(reboot_setup);
207