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1da177e4 LT |
1 | /* |
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 | |
4 | * for more details. | |
5 | * | |
fcdb27ad | 6 | * Copyright (C) 1997, 1998, 2001, 03, 05, 06 by Ralf Baechle |
1da177e4 | 7 | */ |
71baa1a5 | 8 | #include <linux/linkage.h> |
1da177e4 LT |
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> | |
fcdb27ad | 16 | #include <linux/pm.h> |
1da177e4 LT |
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 | * 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. | |
33 | */ | |
34 | #define POWERDOWN_TIMEOUT 120 | |
35 | ||
36 | /* | |
f18190bd | 37 | * Blink frequency during reboot grace period and when panicked. |
1da177e4 LT |
38 | */ |
39 | #define POWERDOWN_FREQ (HZ / 4) | |
40 | #define PANIC_FREQ (HZ / 8) | |
41 | ||
42 | static struct timer_list power_timer, blink_timer, debounce_timer, volume_timer; | |
43 | ||
44 | #define MACHINE_PANICED 1 | |
45 | #define MACHINE_SHUTTING_DOWN 2 | |
1da177e4 | 46 | |
71baa1a5 | 47 | static int machine_state; |
1da177e4 | 48 | |
71baa1a5 | 49 | static void ATTRIB_NORET sgi_machine_power_off(void) |
1da177e4 LT |
50 | { |
51 | unsigned int tmp; | |
52 | ||
53 | local_irq_disable(); | |
54 | ||
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; | |
60 | ||
61 | while (1) { | |
62 | sgioc->panel = ~SGIOC_PANEL_POWERON; | |
63 | /* Good bye cruel world ... */ | |
64 | ||
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]; | |
68 | } | |
69 | } | |
70 | ||
71baa1a5 RB |
71 | static void ATTRIB_NORET 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 | ||
79 | static void ATTRIB_NORET sgi_machine_halt(void) | |
80 | { | |
81 | if (machine_state & MACHINE_SHUTTING_DOWN) | |
82 | sgi_machine_power_off(); | |
83 | ArcEnterInteractiveMode(); | |
84 | } | |
85 | ||
1da177e4 LT |
86 | static void power_timeout(unsigned long data) |
87 | { | |
88 | sgi_machine_power_off(); | |
89 | } | |
90 | ||
91 | static void blink_timeout(unsigned long data) | |
92 | { | |
93 | /* XXX fix this for fullhouse */ | |
94 | sgi_ioc_reset ^= (SGIOC_RESET_LC0OFF|SGIOC_RESET_LC1OFF); | |
95 | sgioc->reset = sgi_ioc_reset; | |
96 | ||
71baa1a5 | 97 | mod_timer(&blink_timer, jiffies + data); |
1da177e4 LT |
98 | } |
99 | ||
100 | static void debounce(unsigned long data) | |
101 | { | |
102 | del_timer(&debounce_timer); | |
103 | if (sgint->istat1 & SGINT_ISTAT1_PWR) { | |
104 | /* Interrupt still being sent. */ | |
71baa1a5 | 105 | debounce_timer.expires = jiffies + (HZ / 20); /* 0.05s */ |
1da177e4 LT |
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 | ||
121 | static inline void power_button(void) | |
122 | { | |
123 | if (machine_state & MACHINE_PANICED) | |
124 | return; | |
125 | ||
126 | if ((machine_state & MACHINE_SHUTTING_DOWN) || kill_proc(1,SIGINT,1)) { | |
127 | /* No init process or button pressed twice. */ | |
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 | ||
141 | void (*indy_volume_button)(int) = NULL; | |
142 | ||
143 | EXPORT_SYMBOL(indy_volume_button); | |
144 | ||
145 | static inline void volume_up_button(unsigned long data) | |
146 | { | |
147 | del_timer(&volume_timer); | |
148 | ||
149 | if (indy_volume_button) | |
150 | indy_volume_button(1); | |
151 | ||
152 | if (sgint->istat1 & SGINT_ISTAT1_PWR) { | |
71baa1a5 | 153 | volume_timer.expires = jiffies + (HZ / 100); |
1da177e4 LT |
154 | add_timer(&volume_timer); |
155 | } | |
156 | } | |
157 | ||
158 | static inline void volume_down_button(unsigned long data) | |
159 | { | |
160 | del_timer(&volume_timer); | |
161 | ||
162 | if (indy_volume_button) | |
163 | indy_volume_button(-1); | |
164 | ||
165 | if (sgint->istat1 & SGINT_ISTAT1_PWR) { | |
71baa1a5 | 166 | volume_timer.expires = jiffies + (HZ / 100); |
1da177e4 LT |
167 | add_timer(&volume_timer); |
168 | } | |
169 | } | |
170 | ||
171 | static irqreturn_t panel_int(int irq, void *dev_id, struct pt_regs *regs) | |
172 | { | |
173 | unsigned int buttons; | |
174 | ||
175 | buttons = sgioc->panel; | |
176 | sgioc->panel = SGIOC_PANEL_POWERON | SGIOC_PANEL_POWERINTR; | |
177 | ||
178 | if (sgint->istat1 & SGINT_ISTAT1_PWR) { | |
179 | /* Wait until interrupt goes away */ | |
180 | disable_irq(SGI_PANEL_IRQ); | |
181 | init_timer(&debounce_timer); | |
182 | debounce_timer.function = debounce; | |
183 | debounce_timer.expires = jiffies + 5; | |
184 | add_timer(&debounce_timer); | |
185 | } | |
186 | ||
42a3b4f2 | 187 | /* Power button was pressed |
1da177e4 LT |
188 | * ioc.ps page 22: "The Panel Register is called Power Control by Full |
189 | * House. Only lowest 2 bits are used. Guiness uses upper four bits | |
190 | * for volume control". This is not true, all bits are pulled high | |
191 | * on fullhouse */ | |
192 | if (ip22_is_fullhouse() || !(buttons & SGIOC_PANEL_POWERINTR)) { | |
193 | power_button(); | |
194 | return IRQ_HANDLED; | |
195 | } | |
196 | /* TODO: mute/unmute */ | |
197 | /* Volume up button was pressed */ | |
198 | if (!(buttons & SGIOC_PANEL_VOLUPINTR)) { | |
199 | init_timer(&volume_timer); | |
200 | volume_timer.function = volume_up_button; | |
71baa1a5 | 201 | volume_timer.expires = jiffies + (HZ / 100); |
1da177e4 LT |
202 | add_timer(&volume_timer); |
203 | } | |
204 | /* Volume down button was pressed */ | |
205 | if (!(buttons & SGIOC_PANEL_VOLDNINTR)) { | |
206 | init_timer(&volume_timer); | |
207 | volume_timer.function = volume_down_button; | |
71baa1a5 | 208 | volume_timer.expires = jiffies + (HZ / 100); |
1da177e4 LT |
209 | add_timer(&volume_timer); |
210 | } | |
211 | ||
212 | return IRQ_HANDLED; | |
213 | } | |
214 | ||
215 | static int panic_event(struct notifier_block *this, unsigned long event, | |
216 | void *ptr) | |
217 | { | |
218 | if (machine_state & MACHINE_PANICED) | |
219 | return NOTIFY_DONE; | |
220 | machine_state |= MACHINE_PANICED; | |
221 | ||
222 | blink_timer.data = PANIC_FREQ; | |
223 | blink_timeout(PANIC_FREQ); | |
224 | ||
225 | return NOTIFY_DONE; | |
226 | } | |
227 | ||
228 | static struct notifier_block panic_block = { | |
229 | .notifier_call = panic_event, | |
230 | }; | |
231 | ||
232 | static int __init reboot_setup(void) | |
233 | { | |
234 | _machine_restart = sgi_machine_restart; | |
235 | _machine_halt = sgi_machine_halt; | |
fcdb27ad | 236 | pm_power_off = sgi_machine_power_off; |
1da177e4 LT |
237 | |
238 | request_irq(SGI_PANEL_IRQ, panel_int, 0, "Front Panel", NULL); | |
239 | init_timer(&blink_timer); | |
240 | blink_timer.function = blink_timeout; | |
e041c683 | 241 | atomic_notifier_chain_register(&panic_notifier_list, &panic_block); |
1da177e4 LT |
242 | |
243 | return 0; | |
244 | } | |
245 | ||
246 | subsys_initcall(reboot_setup); |