/arch/mips/sgi-ip22/ip22-reset.c

  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, 2003 by Ralf Baechle
  7 */
  8#include <linux/init.h>
  9#include <linux/ds1286.h>
 10#include <linux/module.h>
 11#include <linux/interrupt.h>
 12#include <linux/kernel.h>
 13#include <linux/sched.h>
 14#include <linux/notifier.h>
 15#include <linux/timer.h>
 16
 17#include <asm/io.h>
 18#include <asm/irq.h>
 19#include <asm/system.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 paniced.
 36 */
 37#define POWERDOWN_FREQ		(HZ / 4)
 38#define PANIC_FREQ		(HZ / 8)
 39
 40static struct timer_list power_timer, blink_timer, debounce_timer, volume_timer;
 41
 42#define MACHINE_PANICED		1
 43#define MACHINE_SHUTTING_DOWN	2
 44static int machine_state = 0;
 45
 46static void sgi_machine_restart(char *command) __attribute__((noreturn));
 47static void sgi_machine_halt(void) __attribute__((noreturn));
 48static void sgi_machine_power_off(void) __attribute__((noreturn));
 49
 50static void sgi_machine_restart(char *command)
 51{
 52	if (machine_state & MACHINE_SHUTTING_DOWN)
 53		sgi_machine_power_off();
 54	sgimc->cpuctrl0 |= SGIMC_CCTRL0_SYSINIT;
 55	while (1);
 56}
 57
 58static void sgi_machine_halt(void)
 59{
 60	if (machine_state & MACHINE_SHUTTING_DOWN)
 61		sgi_machine_power_off();
 62	ArcEnterInteractiveMode();
 63}
 64
 65static void sgi_machine_power_off(void)
 66{
 67	unsigned int tmp;
 68
 69	local_irq_disable();
 70
 71	/* Disable watchdog */
 72	tmp = hpc3c0->rtcregs[RTC_CMD] & 0xff;
 73	hpc3c0->rtcregs[RTC_CMD] = tmp | RTC_WAM;
 74	hpc3c0->rtcregs[RTC_WSEC] = 0;
 75	hpc3c0->rtcregs[RTC_WHSEC] = 0;
 76
 77	while (1) {
 78		sgioc->panel = ~SGIOC_PANEL_POWERON;
 79		/* Good bye cruel world ...  */
 80
 81		/* If we're still running, we probably got sent an alarm
 82		   interrupt.  Read the flag to clear it.  */
 83		tmp = hpc3c0->rtcregs[RTC_HOURS_ALARM];
 84	}
 85}
 86
 87static void power_timeout(unsigned long data)
 88{
 89	sgi_machine_power_off();
 90}
 91
 92static void blink_timeout(unsigned long data)
 93{
 94	/* XXX fix this for fullhouse  */
 95	sgi_ioc_reset ^= (SGIOC_RESET_LC0OFF|SGIOC_RESET_LC1OFF);
 96	sgioc->reset = sgi_ioc_reset;
 97
 98	mod_timer(&blink_timer, jiffies+data);
 99}
100
101static void debounce(unsigned long data)
102{
103	del_timer(&debounce_timer);
104	if (sgint->istat1 & SGINT_ISTAT1_PWR) {
105		/* Interrupt still being sent. */
106		debounce_timer.expires = jiffies + 5; /* 0.05s  */
107		add_timer(&debounce_timer);
108
109		sgioc->panel = SGIOC_PANEL_POWERON | SGIOC_PANEL_POWERINTR |
110			       SGIOC_PANEL_VOLDNINTR | SGIOC_PANEL_VOLDNHOLD |
111			       SGIOC_PANEL_VOLUPINTR | SGIOC_PANEL_VOLUPHOLD;
112
113		return;
114	}
115
116	if (machine_state & MACHINE_PANICED)
117		sgimc->cpuctrl0 |= SGIMC_CCTRL0_SYSINIT;
118
119	enable_irq(SGI_PANEL_IRQ);
120}
121
122static inline void power_button(void)
123{
124	if (machine_state & MACHINE_PANICED)
125		return;
126
127	if ((machine_state & MACHINE_SHUTTING_DOWN) || kill_proc(1,SIGINT,1)) {
128		/* No init process or button pressed twice.  */
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
142void (*indy_volume_button)(int) = NULL;
143
144EXPORT_SYMBOL(indy_volume_button);
145
146static inline void volume_up_button(unsigned long data)
147{
148	del_timer(&volume_timer);
149
150	if (indy_volume_button)
151		indy_volume_button(1);
152
153	if (sgint->istat1 & SGINT_ISTAT1_PWR) {
154		volume_timer.expires = jiffies + 1;
155		add_timer(&volume_timer);
156	}
157}
158
159static inline void volume_down_button(unsigned long data)
160{
161	del_timer(&volume_timer);
162
163	if (indy_volume_button)
164		indy_volume_button(-1);
165
166	if (sgint->istat1 & SGINT_ISTAT1_PWR) {
167		volume_timer.expires = jiffies + 1;
168		add_timer(&volume_timer);
169	}
170}
171
172static irqreturn_t panel_int(int irq, void *dev_id, struct pt_regs *regs)
173{
174	unsigned int buttons;
175
176	buttons = sgioc->panel;
177	sgioc->panel = SGIOC_PANEL_POWERON | SGIOC_PANEL_POWERINTR;
178
179	if (sgint->istat1 & SGINT_ISTAT1_PWR) {
180		/* Wait until interrupt goes away */
181		disable_irq(SGI_PANEL_IRQ);
182		init_timer(&debounce_timer);
183		debounce_timer.function = debounce;
184		debounce_timer.expires = jiffies + 5;
185		add_timer(&debounce_timer);
186	}
187
188	/* Power button was pressed 
189	 * ioc.ps page 22: "The Panel Register is called Power Control by Full
190	 * House. Only lowest 2 bits are used. Guiness uses upper four bits
191	 * for volume control". This is not true, all bits are pulled high
192	 * on fullhouse */
193	if (ip22_is_fullhouse() || !(buttons & SGIOC_PANEL_POWERINTR)) {
194		power_button();
195		return IRQ_HANDLED;
196	}
197	/* TODO: mute/unmute */
198	/* Volume up button was pressed */
199	if (!(buttons & SGIOC_PANEL_VOLUPINTR)) {
200		init_timer(&volume_timer);
201		volume_timer.function = volume_up_button;
202		volume_timer.expires = jiffies + 1;
203		add_timer(&volume_timer);
204	}
205	/* Volume down button was pressed */
206	if (!(buttons & SGIOC_PANEL_VOLDNINTR)) {
207		init_timer(&volume_timer);
208		volume_timer.function = volume_down_button;
209		volume_timer.expires = jiffies + 1;
210		add_timer(&volume_timer);
211	}
212
213	return IRQ_HANDLED;
214}
215
216static int panic_event(struct notifier_block *this, unsigned long event,
217                      void *ptr)
218{
219	if (machine_state & MACHINE_PANICED)
220		return NOTIFY_DONE;
221	machine_state |= MACHINE_PANICED;
222
223	blink_timer.data = PANIC_FREQ;
224	blink_timeout(PANIC_FREQ);
225
226	return NOTIFY_DONE;
227}
228
229static struct notifier_block panic_block = {
230	.notifier_call	= panic_event,
231};
232
233static int __init reboot_setup(void)
234{
235	_machine_restart = sgi_machine_restart;
236	_machine_halt = sgi_machine_halt;
237	_machine_power_off = sgi_machine_power_off;
238
239	request_irq(SGI_PANEL_IRQ, panel_int, 0, "Front Panel", NULL);
240	init_timer(&blink_timer);
241	blink_timer.function = blink_timeout;
242	notifier_chain_register(&panic_notifier_list, &panic_block);
243
244	return 0;
245}
246
247subsys_initcall(reboot_setup);