[mirror_ubuntu-artful-kernel.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 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/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 paniced.
 */
#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_proc(1,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;
	_machine_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;
	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	*
71baa1a5	6	* Copyright (C) 1997, 1998, 2001, 03, 05 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>
	16	#include <linux/timer.h>
	17
	18	#include <asm/io.h>
	19	#include <asm/irq.h>
	20	#include <asm/system.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	/*
	29	* Just powerdown if init hasn't done after POWERDOWN_TIMEOUT seconds.
	30	* I'm not sure if this feature is a good idea, for now it's here just to
	31	* make the power button make behave just like under IRIX.
	32	*/
	33	#define POWERDOWN_TIMEOUT 120
	34
	35	/*
	36	* Blink frequency during reboot grace period and when paniced.
	37	*/
	38	#define POWERDOWN_FREQ (HZ / 4)
	39	#define PANIC_FREQ (HZ / 8)
	40
	41	static struct timer_list power_timer, blink_timer, debounce_timer, volume_timer;
	42
	43	#define MACHINE_PANICED 1
	44	#define MACHINE_SHUTTING_DOWN 2
1da177e4	45
71baa1a5	46	static int machine_state;
1da177e4	47
71baa1a5	48	static void ATTRIB_NORET sgi_machine_power_off(void)
1da177e4 LT	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
71baa1a5 RB	70	static void ATTRIB_NORET 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 ATTRIB_NORET sgi_machine_halt(void)
	79	{
	80	if (machine_state & MACHINE_SHUTTING_DOWN)
	81	sgi_machine_power_off();
	82	ArcEnterInteractiveMode();
	83	}
	84
1da177e4 LT	85	static void power_timeout(unsigned long data)
	86	{
	87	sgi_machine_power_off();
	88	}
	89
	90	static void blink_timeout(unsigned long data)
	91	{
	92	/* XXX fix this for fullhouse */
	93	sgi_ioc_reset ^= (SGIOC_RESET_LC0OFF\|SGIOC_RESET_LC1OFF);
	94	sgioc->reset = sgi_ioc_reset;
	95
71baa1a5	96	mod_timer(&blink_timer, jiffies + data);
1da177e4 LT	97	}
	98
	99	static void debounce(unsigned long data)
	100	{
	101	del_timer(&debounce_timer);
	102	if (sgint->istat1 & SGINT_ISTAT1_PWR) {
	103	/* Interrupt still being sent. */
71baa1a5	104	debounce_timer.expires = jiffies + (HZ / 20); /* 0.05s */
1da177e4 LT	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
	120	static inline void power_button(void)
	121	{
	122	if (machine_state & MACHINE_PANICED)
	123	return;
	124
	125	if ((machine_state & MACHINE_SHUTTING_DOWN) \|\| kill_proc(1,SIGINT,1)) {
	126	/* No init process or button pressed twice. */
	127	sgi_machine_power_off();
	128	}
	129
	130	machine_state \|= MACHINE_SHUTTING_DOWN;
	131	blink_timer.data = POWERDOWN_FREQ;
	132	blink_timeout(POWERDOWN_FREQ);
	133
	134	init_timer(&power_timer);
	135	power_timer.function = power_timeout;
	136	power_timer.expires = jiffies + POWERDOWN_TIMEOUT * HZ;
	137	add_timer(&power_timer);
	138	}
	139
	140	void (*indy_volume_button)(int) = NULL;
	141
	142	EXPORT_SYMBOL(indy_volume_button);
	143
	144	static inline void volume_up_button(unsigned long data)
	145	{
	146	del_timer(&volume_timer);
	147
	148	if (indy_volume_button)
	149	indy_volume_button(1);
	150
	151	if (sgint->istat1 & SGINT_ISTAT1_PWR) {
71baa1a5	152	volume_timer.expires = jiffies + (HZ / 100);
1da177e4 LT	153	add_timer(&volume_timer);
	154	}
	155	}
	156
	157	static inline void volume_down_button(unsigned long data)
	158	{
	159	del_timer(&volume_timer);
	160
	161	if (indy_volume_button)
	162	indy_volume_button(-1);
	163
	164	if (sgint->istat1 & SGINT_ISTAT1_PWR) {
71baa1a5	165	volume_timer.expires = jiffies + (HZ / 100);
1da177e4 LT	166	add_timer(&volume_timer);
	167	}
	168	}
	169
	170	static irqreturn_t panel_int(int irq, void dev_id, struct pt_regs regs)
	171	{
	172	unsigned int buttons;
	173
	174	buttons = sgioc->panel;
	175	sgioc->panel = SGIOC_PANEL_POWERON \| SGIOC_PANEL_POWERINTR;
	176
	177	if (sgint->istat1 & SGINT_ISTAT1_PWR) {
	178	/* Wait until interrupt goes away */
	179	disable_irq(SGI_PANEL_IRQ);
	180	init_timer(&debounce_timer);
	181	debounce_timer.function = debounce;
	182	debounce_timer.expires = jiffies + 5;
	183	add_timer(&debounce_timer);
	184	}
	185
42a3b4f2	186	/* Power button was pressed
1da177e4 LT	187	* ioc.ps page 22: "The Panel Register is called Power Control by Full
	188	* House. Only lowest 2 bits are used. Guiness uses upper four bits
	189	* for volume control". This is not true, all bits are pulled high
	190	* on fullhouse */
	191	if (ip22_is_fullhouse() \|\| !(buttons & SGIOC_PANEL_POWERINTR)) {
	192	power_button();
	193	return IRQ_HANDLED;
	194	}
	195	/* TODO: mute/unmute */
	196	/* Volume up button was pressed */
	197	if (!(buttons & SGIOC_PANEL_VOLUPINTR)) {
	198	init_timer(&volume_timer);
	199	volume_timer.function = volume_up_button;
71baa1a5	200	volume_timer.expires = jiffies + (HZ / 100);
1da177e4 LT	201	add_timer(&volume_timer);
	202	}
	203	/* Volume down button was pressed */
	204	if (!(buttons & SGIOC_PANEL_VOLDNINTR)) {
	205	init_timer(&volume_timer);
	206	volume_timer.function = volume_down_button;
71baa1a5	207	volume_timer.expires = jiffies + (HZ / 100);
1da177e4 LT	208	add_timer(&volume_timer);
	209	}
	210
	211	return IRQ_HANDLED;
	212	}
	213
	214	static int panic_event(struct notifier_block *this, unsigned long event,
	215	void *ptr)
	216	{
	217	if (machine_state & MACHINE_PANICED)
	218	return NOTIFY_DONE;
	219	machine_state \|= MACHINE_PANICED;
	220
	221	blink_timer.data = PANIC_FREQ;
	222	blink_timeout(PANIC_FREQ);
	223
	224	return NOTIFY_DONE;
	225	}
	226
	227	static struct notifier_block panic_block = {
	228	.notifier_call = panic_event,
	229	};
	230
	231	static int __init reboot_setup(void)
	232	{
	233	_machine_restart = sgi_machine_restart;
	234	_machine_halt = sgi_machine_halt;
	235	_machine_power_off = sgi_machine_power_off;
	236
	237	request_irq(SGI_PANEL_IRQ, panel_int, 0, "Front Panel", NULL);
	238	init_timer(&blink_timer);
	239	blink_timer.function = blink_timeout;
	240	notifier_chain_register(&panic_notifier_list, &panic_block);
	241
	242	return 0;
	243	}
	244
	245	subsys_initcall(reboot_setup);