[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, 06 by Ralf Baechle
 */
#include <linux/linkage.h>
#include <linux/init.h>
#include <linux/rtc/ds1286.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/sched/signal.h>
#include <linux/notifier.h>
#include <linux/pm.h>
#include <linux/timer.h>

#include <asm/io.h>
#include <asm/irq.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;

#define MACHINE_PANICED		1
#define MACHINE_SHUTTING_DOWN	2

static int machine_state;

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

static void __noreturn 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);
}

static irqreturn_t panel_int(int irq, void *dev_id)
{
	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_nosync(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 (!(buttons & SGIOC_PANEL_POWERINTR))
		power_button();

	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)
{
	int res;

	_machine_restart = sgi_machine_restart;
	_machine_halt = sgi_machine_halt;
	pm_power_off = sgi_machine_power_off;

	res = request_irq(SGI_PANEL_IRQ, panel_int, 0, "Front Panel", NULL);
	if (res) {
		printk(KERN_ERR "Allocation of front panel IRQ failed\n");
		return res;
	}

	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	9	#include <linux/init.h>
d4a5f6d7	10	#include <linux/rtc/ds1286.h>
1da177e4 LT	11	#include <linux/interrupt.h>
1da177e4 LT	12	#include <linux/kernel.h>
3f07c014	13	#include <linux/sched/signal.h>
1da177e4	14	#include <linux/notifier.h>
fcdb27ad	15	#include <linux/pm.h>
1da177e4 LT	16	#include <linux/timer.h>
	17
	18	#include <asm/io.h>
	19	#include <asm/irq.h>
1da177e4 LT	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	/*
f18190bd	35	* Blink frequency during reboot grace period and when panicked.
1da177e4 LT	36	*/
	37	#define POWERDOWN_FREQ (HZ / 4)
	38	#define PANIC_FREQ (HZ / 8)
	39
b03d7b18	40	static struct timer_list power_timer, blink_timer, debounce_timer;
1da177e4 LT	41
	42	#define MACHINE_PANICED 1
	43	#define MACHINE_SHUTTING_DOWN 2
1da177e4	44
71baa1a5	45	static int machine_state;
1da177e4	46
b3f6df9f	47	static void __noreturn sgi_machine_power_off(void)
1da177e4 LT	48	{
	49	unsigned int tmp;
	50
	51	local_irq_disable();
	52
	53	/* Disable watchdog */
	54	tmp = hpc3c0->rtcregs[RTC_CMD] & 0xff;
	55	hpc3c0->rtcregs[RTC_CMD] = tmp \| RTC_WAM;
	56	hpc3c0->rtcregs[RTC_WSEC] = 0;
	57	hpc3c0->rtcregs[RTC_WHSEC] = 0;
	58
	59	while (1) {
	60	sgioc->panel = ~SGIOC_PANEL_POWERON;
	61	/* Good bye cruel world ... */
	62
	63	/* If we're still running, we probably got sent an alarm
	64	interrupt. Read the flag to clear it. */
	65	tmp = hpc3c0->rtcregs[RTC_HOURS_ALARM];
	66	}
	67	}
	68
b3f6df9f	69	static void __noreturn sgi_machine_restart(char *command)
71baa1a5 RB	70	{
	71	if (machine_state & MACHINE_SHUTTING_DOWN)
	72	sgi_machine_power_off();
	73	sgimc->cpuctrl0 \|= SGIMC_CCTRL0_SYSINIT;
	74	while (1);
	75	}
	76
b3f6df9f	77	static void __noreturn sgi_machine_halt(void)
71baa1a5 RB	78	{
	79	if (machine_state & MACHINE_SHUTTING_DOWN)
	80	sgi_machine_power_off();
	81	ArcEnterInteractiveMode();
	82	}
	83
1da177e4 LT	84	static void power_timeout(unsigned long data)
	85	{
	86	sgi_machine_power_off();
	87	}
	88
	89	static void blink_timeout(unsigned long data)
	90	{
	91	/* XXX fix this for fullhouse */
	92	sgi_ioc_reset ^= (SGIOC_RESET_LC0OFF\|SGIOC_RESET_LC1OFF);
	93	sgioc->reset = sgi_ioc_reset;
	94
71baa1a5	95	mod_timer(&blink_timer, jiffies + data);
1da177e4 LT	96	}
	97
	98	static void debounce(unsigned long data)
	99	{
	100	del_timer(&debounce_timer);
	101	if (sgint->istat1 & SGINT_ISTAT1_PWR) {
	102	/* Interrupt still being sent. */
70342287	103	debounce_timer.expires = jiffies + (HZ / 20); /* 0.05s */
1da177e4 LT	104	add_timer(&debounce_timer);
	105
	106	sgioc->panel = SGIOC_PANEL_POWERON \| SGIOC_PANEL_POWERINTR \|
	107	SGIOC_PANEL_VOLDNINTR \| SGIOC_PANEL_VOLDNHOLD \|
	108	SGIOC_PANEL_VOLUPINTR \| SGIOC_PANEL_VOLUPHOLD;
	109
	110	return;
	111	}
	112
	113	if (machine_state & MACHINE_PANICED)
	114	sgimc->cpuctrl0 \|= SGIMC_CCTRL0_SYSINIT;
	115
	116	enable_irq(SGI_PANEL_IRQ);
	117	}
	118
	119	static inline void power_button(void)
	120	{
	121	if (machine_state & MACHINE_PANICED)
	122	return;
	123
9ec52099 CLG	124	if ((machine_state & MACHINE_SHUTTING_DOWN) \|\|
9ec52099 CLG	125	kill_cad_pid(SIGINT, 1)) {
1da177e4 LT	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
7d12e780	140	static irqreturn_t panel_int(int irq, void *dev_id)
1da177e4 LT	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 */
7e9e05ca	149	disable_irq_nosync(SGI_PANEL_IRQ);
1da177e4 LT	150	init_timer(&debounce_timer);
	151	debounce_timer.function = debounce;
	152	debounce_timer.expires = jiffies + 5;
	153	add_timer(&debounce_timer);
	154	}
	155
42a3b4f2	156	/* Power button was pressed
1da177e4 LT	157	* ioc.ps page 22: "The Panel Register is called Power Control by Full
	158	* House. Only lowest 2 bits are used. Guiness uses upper four bits
	159	* for volume control". This is not true, all bits are pulled high
	160	* on fullhouse */
b03d7b18	161	if (!(buttons & SGIOC_PANEL_POWERINTR))
1da177e4	162	power_button();
1da177e4 LT	163
	164	return IRQ_HANDLED;
	165	}
	166
	167	static int panic_event(struct notifier_block *this, unsigned long event,
70342287	168	void *ptr)
1da177e4 LT	169	{
	170	if (machine_state & MACHINE_PANICED)
	171	return NOTIFY_DONE;
	172	machine_state \|= MACHINE_PANICED;
	173
	174	blink_timer.data = PANIC_FREQ;
	175	blink_timeout(PANIC_FREQ);
	176
	177	return NOTIFY_DONE;
	178	}
	179
	180	static struct notifier_block panic_block = {
	181	.notifier_call = panic_event,
	182	};
	183
	184	static int __init reboot_setup(void)
	185	{
754d0f23 RB	186	int res;
754d0f23 RB	187
1da177e4 LT	188	_machine_restart = sgi_machine_restart;
1da177e4 LT	189	_machine_halt = sgi_machine_halt;
fcdb27ad	190	pm_power_off = sgi_machine_power_off;
1da177e4	191
754d0f23 RB	192	res = request_irq(SGI_PANEL_IRQ, panel_int, 0, "Front Panel", NULL);
	193	if (res) {
	194	printk(KERN_ERR "Allocation of front panel IRQ failed\n");
	195	return res;
	196	}
	197
1da177e4 LT	198	init_timer(&blink_timer);
1da177e4 LT	199	blink_timer.function = blink_timeout;
e041c683	200	atomic_notifier_chain_register(&panic_notifier_list, &panic_block);
1da177e4 LT	201
	202	return 0;
	203	}
	204
	205	subsys_initcall(reboot_setup);