[net-next-2.6.git] / arch / mips / sgi-ip22 / ip22-reset.c

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1997, 1998, 2001, 03, 05, 06 by Ralf Baechle
 */
#include <linux/linkage.h>
#include <linux/init.h>
#include <linux/ds1286.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/notifier.h>
#include <linux/pm.h>
#include <linux/timer.h>

#include <asm/io.h>
#include <asm/irq.h>
#include <asm/system.h>
#include <asm/reboot.h>
#include <asm/sgialib.h>
#include <asm/sgi/ioc.h>
#include <asm/sgi/hpc3.h>
#include <asm/sgi/mc.h>
#include <asm/sgi/ip22.h>

/*
 * Just powerdown if init hasn't done after POWERDOWN_TIMEOUT seconds.
 * I'm not sure if this feature is a good idea, for now it's here just to
 * make the power button make behave just like under IRIX.
 */
#define POWERDOWN_TIMEOUT	120

/*
 * Blink frequency during reboot grace period and when panicked.
 */
#define POWERDOWN_FREQ		(HZ / 4)
#define PANIC_FREQ		(HZ / 8)

static struct timer_list power_timer, blink_timer, debounce_timer, volume_timer;

#define MACHINE_PANICED		1
#define MACHINE_SHUTTING_DOWN	2

static int machine_state;

static void ATTRIB_NORET sgi_machine_power_off(void)
{
	unsigned int tmp;

	local_irq_disable();

	/* Disable watchdog */
	tmp = hpc3c0->rtcregs[RTC_CMD] & 0xff;
	hpc3c0->rtcregs[RTC_CMD] = tmp | RTC_WAM;
	hpc3c0->rtcregs[RTC_WSEC] = 0;
	hpc3c0->rtcregs[RTC_WHSEC] = 0;

	while (1) {
		sgioc->panel = ~SGIOC_PANEL_POWERON;
		/* Good bye cruel world ...  */

		/* If we're still running, we probably got sent an alarm
		   interrupt.  Read the flag to clear it.  */
		tmp = hpc3c0->rtcregs[RTC_HOURS_ALARM];
	}
}

static void ATTRIB_NORET sgi_machine_restart(char *command)
{
	if (machine_state & MACHINE_SHUTTING_DOWN)
		sgi_machine_power_off();
	sgimc->cpuctrl0 |= SGIMC_CCTRL0_SYSINIT;
	while (1);
}

static void ATTRIB_NORET sgi_machine_halt(void)
{
	if (machine_state & MACHINE_SHUTTING_DOWN)
		sgi_machine_power_off();
	ArcEnterInteractiveMode();
}

static void power_timeout(unsigned long data)
{
	sgi_machine_power_off();
}

static void blink_timeout(unsigned long data)
{
	/* XXX fix this for fullhouse  */
	sgi_ioc_reset ^= (SGIOC_RESET_LC0OFF|SGIOC_RESET_LC1OFF);
	sgioc->reset = sgi_ioc_reset;

	mod_timer(&blink_timer, jiffies + data);
}

static void debounce(unsigned long data)
{
	del_timer(&debounce_timer);
	if (sgint->istat1 & SGINT_ISTAT1_PWR) {
		/* Interrupt still being sent. */
		debounce_timer.expires = jiffies + (HZ / 20); /* 0.05s  */
		add_timer(&debounce_timer);

		sgioc->panel = SGIOC_PANEL_POWERON | SGIOC_PANEL_POWERINTR |
			       SGIOC_PANEL_VOLDNINTR | SGIOC_PANEL_VOLDNHOLD |
			       SGIOC_PANEL_VOLUPINTR | SGIOC_PANEL_VOLUPHOLD;

		return;
	}

	if (machine_state & MACHINE_PANICED)
		sgimc->cpuctrl0 |= SGIMC_CCTRL0_SYSINIT;

	enable_irq(SGI_PANEL_IRQ);
}

static inline void power_button(void)
{
	if (machine_state & MACHINE_PANICED)
		return;

	if ((machine_state & MACHINE_SHUTTING_DOWN) ||
			kill_cad_pid(SIGINT, 1)) {
		/* No init process or button pressed twice.  */
		sgi_machine_power_off();
	}

	machine_state |= MACHINE_SHUTTING_DOWN;
	blink_timer.data = POWERDOWN_FREQ;
	blink_timeout(POWERDOWN_FREQ);

	init_timer(&power_timer);
	power_timer.function = power_timeout;
	power_timer.expires = jiffies + POWERDOWN_TIMEOUT * HZ;
	add_timer(&power_timer);
}

void (*indy_volume_button)(int) = NULL;

EXPORT_SYMBOL(indy_volume_button);

static inline void volume_up_button(unsigned long data)
{
	del_timer(&volume_timer);

	if (indy_volume_button)
		indy_volume_button(1);

	if (sgint->istat1 & SGINT_ISTAT1_PWR) {
		volume_timer.expires = jiffies + (HZ / 100);
		add_timer(&volume_timer);
	}
}

static inline void volume_down_button(unsigned long data)
{
	del_timer(&volume_timer);

	if (indy_volume_button)
		indy_volume_button(-1);

	if (sgint->istat1 & SGINT_ISTAT1_PWR) {
		volume_timer.expires = jiffies + (HZ / 100);
		add_timer(&volume_timer);
	}
}

static irqreturn_t panel_int(int irq, void *dev_id, struct pt_regs *regs)
{
	unsigned int buttons;

	buttons = sgioc->panel;
	sgioc->panel = SGIOC_PANEL_POWERON | SGIOC_PANEL_POWERINTR;

	if (sgint->istat1 & SGINT_ISTAT1_PWR) {
		/* Wait until interrupt goes away */
		disable_irq(SGI_PANEL_IRQ);
		init_timer(&debounce_timer);
		debounce_timer.function = debounce;
		debounce_timer.expires = jiffies + 5;
		add_timer(&debounce_timer);
	}

	/* Power button was pressed
	 * ioc.ps page 22: "The Panel Register is called Power Control by Full
	 * House. Only lowest 2 bits are used. Guiness uses upper four bits
	 * for volume control". This is not true, all bits are pulled high
	 * on fullhouse */
	if (ip22_is_fullhouse() || !(buttons & SGIOC_PANEL_POWERINTR)) {
		power_button();
		return IRQ_HANDLED;
	}
	/* TODO: mute/unmute */
	/* Volume up button was pressed */
	if (!(buttons & SGIOC_PANEL_VOLUPINTR)) {
		init_timer(&volume_timer);
		volume_timer.function = volume_up_button;
		volume_timer.expires = jiffies + (HZ / 100);
		add_timer(&volume_timer);
	}
	/* Volume down button was pressed */
	if (!(buttons & SGIOC_PANEL_VOLDNINTR)) {
		init_timer(&volume_timer);
		volume_timer.function = volume_down_button;
		volume_timer.expires = jiffies + (HZ / 100);
		add_timer(&volume_timer);
	}

	return IRQ_HANDLED;
}

static int panic_event(struct notifier_block *this, unsigned long event,
                      void *ptr)
{
	if (machine_state & MACHINE_PANICED)
		return NOTIFY_DONE;
	machine_state |= MACHINE_PANICED;

	blink_timer.data = PANIC_FREQ;
	blink_timeout(PANIC_FREQ);

	return NOTIFY_DONE;
}

static struct notifier_block panic_block = {
	.notifier_call	= panic_event,
};

static int __init reboot_setup(void)
{
	_machine_restart = sgi_machine_restart;
	_machine_halt = sgi_machine_halt;
	pm_power_off = sgi_machine_power_off;

	request_irq(SGI_PANEL_IRQ, panel_int, 0, "Front Panel", NULL);
	init_timer(&blink_timer);
	blink_timer.function = blink_timeout;
	atomic_notifier_chain_register(&panic_notifier_list, &panic_block);

	return 0;
}

subsys_initcall(reboot_setup);
Commit	Line	Data
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
9ec52099 CLG	126	if ((machine_state & MACHINE_SHUTTING_DOWN) \|\|
9ec52099 CLG	127	kill_cad_pid(SIGINT, 1)) {
1da177e4 LT	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
	142	void (*indy_volume_button)(int) = NULL;
	143
	144	EXPORT_SYMBOL(indy_volume_button);
	145
	146	static 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) {
71baa1a5	154	volume_timer.expires = jiffies + (HZ / 100);
1da177e4 LT	155	add_timer(&volume_timer);
	156	}
	157	}
	158
	159	static 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) {
71baa1a5	167	volume_timer.expires = jiffies + (HZ / 100);
1da177e4 LT	168	add_timer(&volume_timer);
	169	}
	170	}
	171
	172	static 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
42a3b4f2	188	/* Power button was pressed
1da177e4 LT	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;
71baa1a5	202	volume_timer.expires = jiffies + (HZ / 100);
1da177e4 LT	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;
71baa1a5	209	volume_timer.expires = jiffies + (HZ / 100);
1da177e4 LT	210	add_timer(&volume_timer);
	211	}
	212
	213	return IRQ_HANDLED;
	214	}
	215
	216	static 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
	229	static struct notifier_block panic_block = {
	230	.notifier_call = panic_event,
	231	};
	232
	233	static int __init reboot_setup(void)
	234	{
	235	_machine_restart = sgi_machine_restart;
	236	_machine_halt = sgi_machine_halt;
fcdb27ad	237	pm_power_off = sgi_machine_power_off;
1da177e4 LT	238
	239	request_irq(SGI_PANEL_IRQ, panel_int, 0, "Front Panel", NULL);
	240	init_timer(&blink_timer);
	241	blink_timer.function = blink_timeout;
e041c683	242	atomic_notifier_chain_register(&panic_notifier_list, &panic_block);
1da177e4 LT	243
	244	return 0;
	245	}
	246
	247	subsys_initcall(reboot_setup);