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 | * |
6 | * Copyright (C) 1997, 1998, 2001, 03, 05, 06 by Ralf Baechle |
7 | */ |
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/signal.h> |
14 | #include <linux/panic_notifier.h> |
15 | #include <linux/pm.h> |
16 | #include <linux/timer.h> |
17 | |
18 | #include <asm/io.h> |
19 | #include <asm/irq.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> |
26 | |
27 | /* |
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. |
31 | */ |
32 | #define POWERDOWN_TIMEOUT 120 |
33 | |
34 | /* |
35 | * Blink frequency during reboot grace period and when panicked. |
36 | */ |
37 | #define POWERDOWN_FREQ (HZ / 4) |
38 | #define PANIC_FREQ (HZ / 8) |
39 | |
40 | static struct timer_list power_timer, blink_timer, debounce_timer; |
41 | static unsigned long blink_timer_timeout; |
42 | |
43 | #define MACHINE_PANICKED 1 |
44 | #define MACHINE_SHUTTING_DOWN 2 |
45 | |
46 | static int machine_state; |
47 | |
48 | static void __noreturn sgi_machine_power_off(void) |
49 | { |
50 | unsigned int tmp; |
51 | |
52 | local_irq_disable(); |
53 | |
54 | /* Disable watchdog */ |
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 | /* Good bye cruel world ... */ |
63 | |
64 | /* If we're still running, we probably got sent an alarm |
65 | interrupt. Read the flag to clear it. */ |
66 | tmp = hpc3c0->rtcregs[RTC_HOURS_ALARM]; |
67 | } |
68 | } |
69 | |
70 | static 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 | |
78 | static void __noreturn sgi_machine_halt(void) |
79 | { |
80 | if (machine_state & MACHINE_SHUTTING_DOWN) |
81 | sgi_machine_power_off(); |
82 | ArcEnterInteractiveMode(); |
83 | } |
84 | |
85 | static void power_timeout(struct timer_list *unused) |
86 | { |
87 | sgi_machine_power_off(); |
88 | } |
89 | |
90 | static void blink_timeout(struct timer_list *unused) |
91 | { |
92 | /* XXX fix this for fullhouse */ |
93 | sgi_ioc_reset ^= (SGIOC_RESET_LC0OFF|SGIOC_RESET_LC1OFF); |
94 | sgioc->reset = sgi_ioc_reset; |
95 | |
96 | mod_timer(timer: &blink_timer, expires: jiffies + blink_timer_timeout); |
97 | } |
98 | |
99 | static void debounce(struct timer_list *unused) |
100 | { |
101 | del_timer(timer: &debounce_timer); |
102 | if (sgint->istat1 & SGINT_ISTAT1_PWR) { |
103 | /* Interrupt still being sent. */ |
104 | debounce_timer.expires = jiffies + (HZ / 20); /* 0.05s */ |
105 | add_timer(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_PANICKED) |
115 | sgimc->cpuctrl0 |= SGIMC_CCTRL0_SYSINIT; |
116 | |
117 | enable_irq(irq: SGI_PANEL_IRQ); |
118 | } |
119 | |
120 | static inline void power_button(void) |
121 | { |
122 | if (machine_state & MACHINE_PANICKED) |
123 | return; |
124 | |
125 | if ((machine_state & MACHINE_SHUTTING_DOWN) || |
126 | kill_cad_pid(SIGINT, priv: 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_timeout = POWERDOWN_FREQ; |
133 | blink_timeout(unused: &blink_timer); |
134 | |
135 | timer_setup(&power_timer, power_timeout, 0); |
136 | power_timer.expires = jiffies + POWERDOWN_TIMEOUT * HZ; |
137 | add_timer(timer: &power_timer); |
138 | } |
139 | |
140 | static irqreturn_t panel_int(int irq, void *dev_id) |
141 | { |
142 | unsigned int buttons; |
143 | |
144 | buttons = sgioc->panel; |
145 | sgioc->panel = SGIOC_PANEL_POWERON | SGIOC_PANEL_POWERINTR; |
146 | |
147 | if (sgint->istat1 & SGINT_ISTAT1_PWR) { |
148 | /* Wait until interrupt goes away */ |
149 | disable_irq_nosync(irq: SGI_PANEL_IRQ); |
150 | timer_setup(&debounce_timer, debounce, 0); |
151 | debounce_timer.expires = jiffies + 5; |
152 | add_timer(timer: &debounce_timer); |
153 | } |
154 | |
155 | /* Power button was pressed |
156 | * ioc.ps page 22: "The Panel Register is called Power Control by Full |
157 | * House. Only lowest 2 bits are used. Guiness uses upper four bits |
158 | * for volume control". This is not true, all bits are pulled high |
159 | * on fullhouse */ |
160 | if (!(buttons & SGIOC_PANEL_POWERINTR)) |
161 | power_button(); |
162 | |
163 | return IRQ_HANDLED; |
164 | } |
165 | |
166 | static int panic_event(struct notifier_block *this, unsigned long event, |
167 | void *ptr) |
168 | { |
169 | if (machine_state & MACHINE_PANICKED) |
170 | return NOTIFY_DONE; |
171 | machine_state |= MACHINE_PANICKED; |
172 | |
173 | blink_timer_timeout = PANIC_FREQ; |
174 | blink_timeout(unused: &blink_timer); |
175 | |
176 | return NOTIFY_DONE; |
177 | } |
178 | |
179 | static struct notifier_block panic_block = { |
180 | .notifier_call = panic_event, |
181 | }; |
182 | |
183 | static int __init reboot_setup(void) |
184 | { |
185 | int res; |
186 | |
187 | _machine_restart = sgi_machine_restart; |
188 | _machine_halt = sgi_machine_halt; |
189 | pm_power_off = sgi_machine_power_off; |
190 | |
191 | res = request_irq(SGI_PANEL_IRQ, panel_int, 0, "Front Panel" , NULL); |
192 | if (res) { |
193 | printk(KERN_ERR "Allocation of front panel IRQ failed\n" ); |
194 | return res; |
195 | } |
196 | |
197 | timer_setup(&blink_timer, blink_timeout, 0); |
198 | atomic_notifier_chain_register(nh: &panic_notifier_list, nb: &panic_block); |
199 | |
200 | return 0; |
201 | } |
202 | |
203 | subsys_initcall(reboot_setup); |
204 | |