[linux.git] / arch / unicore32 / kernel / irq.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * linux/arch/unicore32/kernel/irq.c
 *
 * Code specific to PKUnity SoC and UniCore ISA
 *
 * Copyright (C) 2001-2010 GUAN Xue-tao
 */
#include <linux/kernel_stat.h>
#include <linux/module.h>
#include <linux/signal.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/random.h>
#include <linux/smp.h>
#include <linux/init.h>
#include <linux/seq_file.h>
#include <linux/errno.h>
#include <linux/list.h>
#include <linux/kallsyms.h>
#include <linux/proc_fs.h>
#include <linux/syscore_ops.h>
#include <linux/gpio.h>

#include <mach/hardware.h>

#include "setup.h"

/*
 * PKUnity GPIO edge detection for IRQs:
 * IRQs are generated on Falling-Edge, Rising-Edge, or both.
 * Use this instead of directly setting GRER/GFER.
 */
static int GPIO_IRQ_rising_edge;
static int GPIO_IRQ_falling_edge;
static int GPIO_IRQ_mask = 0;

#define GPIO_MASK(irq)		(1 << (irq - IRQ_GPIO0))

static int puv3_gpio_type(struct irq_data *d, unsigned int type)
{
	unsigned int mask;

	if (d->irq < IRQ_GPIOHIGH)
		mask = 1 << d->irq;
	else
		mask = GPIO_MASK(d->irq);

	if (type == IRQ_TYPE_PROBE) {
		if ((GPIO_IRQ_rising_edge | GPIO_IRQ_falling_edge) & mask)
			return 0;
		type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
	}

	if (type & IRQ_TYPE_EDGE_RISING)
		GPIO_IRQ_rising_edge |= mask;
	else
		GPIO_IRQ_rising_edge &= ~mask;
	if (type & IRQ_TYPE_EDGE_FALLING)
		GPIO_IRQ_falling_edge |= mask;
	else
		GPIO_IRQ_falling_edge &= ~mask;

	writel(GPIO_IRQ_rising_edge & GPIO_IRQ_mask, GPIO_GRER);
	writel(GPIO_IRQ_falling_edge & GPIO_IRQ_mask, GPIO_GFER);

	return 0;
}

/*
 * GPIO IRQs must be acknowledged.  This is for IRQs from 0 to 7.
 */
static void puv3_low_gpio_ack(struct irq_data *d)
{
	writel((1 << d->irq), GPIO_GEDR);
}

static void puv3_low_gpio_mask(struct irq_data *d)
{
	writel(readl(INTC_ICMR) & ~(1 << d->irq), INTC_ICMR);
}

static void puv3_low_gpio_unmask(struct irq_data *d)
{
	writel(readl(INTC_ICMR) | (1 << d->irq), INTC_ICMR);
}

static int puv3_low_gpio_wake(struct irq_data *d, unsigned int on)
{
	if (on)
		writel(readl(PM_PWER) | (1 << d->irq), PM_PWER);
	else
		writel(readl(PM_PWER) & ~(1 << d->irq), PM_PWER);
	return 0;
}

static struct irq_chip puv3_low_gpio_chip = {
	.name		= "GPIO-low",
	.irq_ack	= puv3_low_gpio_ack,
	.irq_mask	= puv3_low_gpio_mask,
	.irq_unmask	= puv3_low_gpio_unmask,
	.irq_set_type	= puv3_gpio_type,
	.irq_set_wake	= puv3_low_gpio_wake,
};

/*
 * IRQ8 (GPIO0 through 27) handler.  We enter here with the
 * irq_controller_lock held, and IRQs disabled.  Decode the IRQ
 * and call the handler.
 */
static void puv3_gpio_handler(struct irq_desc *desc)
{
	unsigned int mask, irq;

	mask = readl(GPIO_GEDR);
	do {
		/*
		 * clear down all currently active IRQ sources.
		 * We will be processing them all.
		 */
		writel(mask, GPIO_GEDR);

		irq = IRQ_GPIO0;
		do {
			if (mask & 1)
				generic_handle_irq(irq);
			mask >>= 1;
			irq++;
		} while (mask);
		mask = readl(GPIO_GEDR);
	} while (mask);
}

/*
 * GPIO0-27 edge IRQs need to be handled specially.
 * In addition, the IRQs are all collected up into one bit in the
 * interrupt controller registers.
 */
static void puv3_high_gpio_ack(struct irq_data *d)
{
	unsigned int mask = GPIO_MASK(d->irq);

	writel(mask, GPIO_GEDR);
}

static void puv3_high_gpio_mask(struct irq_data *d)
{
	unsigned int mask = GPIO_MASK(d->irq);

	GPIO_IRQ_mask &= ~mask;

	writel(readl(GPIO_GRER) & ~mask, GPIO_GRER);
	writel(readl(GPIO_GFER) & ~mask, GPIO_GFER);
}

static void puv3_high_gpio_unmask(struct irq_data *d)
{
	unsigned int mask = GPIO_MASK(d->irq);

	GPIO_IRQ_mask |= mask;

	writel(GPIO_IRQ_rising_edge & GPIO_IRQ_mask, GPIO_GRER);
	writel(GPIO_IRQ_falling_edge & GPIO_IRQ_mask, GPIO_GFER);
}

static int puv3_high_gpio_wake(struct irq_data *d, unsigned int on)
{
	if (on)
		writel(readl(PM_PWER) | PM_PWER_GPIOHIGH, PM_PWER);
	else
		writel(readl(PM_PWER) & ~PM_PWER_GPIOHIGH, PM_PWER);
	return 0;
}

static struct irq_chip puv3_high_gpio_chip = {
	.name		= "GPIO-high",
	.irq_ack	= puv3_high_gpio_ack,
	.irq_mask	= puv3_high_gpio_mask,
	.irq_unmask	= puv3_high_gpio_unmask,
	.irq_set_type	= puv3_gpio_type,
	.irq_set_wake	= puv3_high_gpio_wake,
};

/*
 * We don't need to ACK IRQs on the PKUnity unless they're GPIOs
 * this is for internal IRQs i.e. from 8 to 31.
 */
static void puv3_mask_irq(struct irq_data *d)
{
	writel(readl(INTC_ICMR) & ~(1 << d->irq), INTC_ICMR);
}

static void puv3_unmask_irq(struct irq_data *d)
{
	writel(readl(INTC_ICMR) | (1 << d->irq), INTC_ICMR);
}

/*
 * Apart form GPIOs, only the RTC alarm can be a wakeup event.
 */
static int puv3_set_wake(struct irq_data *d, unsigned int on)
{
	if (d->irq == IRQ_RTCAlarm) {
		if (on)
			writel(readl(PM_PWER) | PM_PWER_RTC, PM_PWER);
		else
			writel(readl(PM_PWER) & ~PM_PWER_RTC, PM_PWER);
		return 0;
	}
	return -EINVAL;
}

static struct irq_chip puv3_normal_chip = {
	.name		= "PKUnity-v3",
	.irq_ack	= puv3_mask_irq,
	.irq_mask	= puv3_mask_irq,
	.irq_unmask	= puv3_unmask_irq,
	.irq_set_wake	= puv3_set_wake,
};

static struct resource irq_resource = {
	.name	= "irqs",
	.start	= io_v2p(PKUNITY_INTC_BASE),
	.end	= io_v2p(PKUNITY_INTC_BASE) + 0xFFFFF,
};

static struct puv3_irq_state {
	unsigned int	saved;
	unsigned int	icmr;
	unsigned int	iclr;
	unsigned int	iccr;
} puv3_irq_state;

static int puv3_irq_suspend(void)
{
	struct puv3_irq_state *st = &puv3_irq_state;

	st->saved = 1;
	st->icmr = readl(INTC_ICMR);
	st->iclr = readl(INTC_ICLR);
	st->iccr = readl(INTC_ICCR);

	/*
	 * Disable all GPIO-based interrupts.
	 */
	writel(readl(INTC_ICMR) & ~(0x1ff), INTC_ICMR);

	/*
	 * Set the appropriate edges for wakeup.
	 */
	writel(readl(PM_PWER) & GPIO_IRQ_rising_edge, GPIO_GRER);
	writel(readl(PM_PWER) & GPIO_IRQ_falling_edge, GPIO_GFER);

	/*
	 * Clear any pending GPIO interrupts.
	 */
	writel(readl(GPIO_GEDR), GPIO_GEDR);

	return 0;
}

static void puv3_irq_resume(void)
{
	struct puv3_irq_state *st = &puv3_irq_state;

	if (st->saved) {
		writel(st->iccr, INTC_ICCR);
		writel(st->iclr, INTC_ICLR);

		writel(GPIO_IRQ_rising_edge & GPIO_IRQ_mask, GPIO_GRER);
		writel(GPIO_IRQ_falling_edge & GPIO_IRQ_mask, GPIO_GFER);

		writel(st->icmr, INTC_ICMR);
	}
}

static struct syscore_ops puv3_irq_syscore_ops = {
	.suspend	= puv3_irq_suspend,
	.resume		= puv3_irq_resume,
};

static int __init puv3_irq_init_syscore(void)
{
	register_syscore_ops(&puv3_irq_syscore_ops);
	return 0;
}

device_initcall(puv3_irq_init_syscore);

void __init init_IRQ(void)
{
	unsigned int irq;

	request_resource(&iomem_resource, &irq_resource);

	/* disable all IRQs */
	writel(0, INTC_ICMR);

	/* all IRQs are IRQ, not REAL */
	writel(0, INTC_ICLR);

	/* clear all GPIO edge detects */
	writel(FMASK(8, 0) & ~FIELD(1, 1, GPI_SOFF_REQ), GPIO_GPIR);
	writel(0, GPIO_GFER);
	writel(0, GPIO_GRER);
	writel(0x0FFFFFFF, GPIO_GEDR);

	writel(1, INTC_ICCR);

	for (irq = 0; irq < IRQ_GPIOHIGH; irq++) {
		irq_set_chip(irq, &puv3_low_gpio_chip);
		irq_set_handler(irq, handle_edge_irq);
		irq_modify_status(irq,
			IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN,
			0);
	}

	for (irq = IRQ_GPIOHIGH + 1; irq < IRQ_GPIO0; irq++) {
		irq_set_chip(irq, &puv3_normal_chip);
		irq_set_handler(irq, handle_level_irq);
		irq_modify_status(irq,
			IRQ_NOREQUEST | IRQ_NOAUTOEN,
			IRQ_NOPROBE);
	}

	for (irq = IRQ_GPIO0; irq <= IRQ_GPIO27; irq++) {
		irq_set_chip(irq, &puv3_high_gpio_chip);
		irq_set_handler(irq, handle_edge_irq);
		irq_modify_status(irq,
			IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN,
			0);
	}

	/*
	 * Install handler for GPIO 0-27 edge detect interrupts
	 */
	irq_set_chip(IRQ_GPIOHIGH, &puv3_normal_chip);
	irq_set_chained_handler(IRQ_GPIOHIGH, puv3_gpio_handler);

#ifdef CONFIG_PUV3_GPIO
	puv3_init_gpio();
#endif
}

/*
 * do_IRQ handles all hardware IRQ's.  Decoded IRQs should not
 * come via this function.  Instead, they should provide their
 * own 'handler'
 */
asmlinkage void asm_do_IRQ(unsigned int irq, struct pt_regs *regs)
{
	struct pt_regs *old_regs = set_irq_regs(regs);

	irq_enter();

	/*
	 * Some hardware gives randomly wrong interrupts.  Rather
	 * than crashing, do something sensible.
	 */
	if (unlikely(irq >= nr_irqs)) {
		if (printk_ratelimit())
			printk(KERN_WARNING "Bad IRQ%u\n", irq);
		ack_bad_irq(irq);
	} else {
		generic_handle_irq(irq);
	}

	irq_exit();
	set_irq_regs(old_regs);
}
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
752bcb4d G	2	/*
	3	* linux/arch/unicore32/kernel/irq.c
	4	*
	5	* Code specific to PKUnity SoC and UniCore ISA
	6	*
	7	* Copyright (C) 2001-2010 GUAN Xue-tao
752bcb4d G	8	*/
	9	#include <linux/kernel_stat.h>
	10	#include <linux/module.h>
	11	#include <linux/signal.h>
	12	#include <linux/ioport.h>
	13	#include <linux/interrupt.h>
	14	#include <linux/irq.h>
	15	#include <linux/random.h>
	16	#include <linux/smp.h>
	17	#include <linux/init.h>
	18	#include <linux/seq_file.h>
	19	#include <linux/errno.h>
	20	#include <linux/list.h>
	21	#include <linux/kallsyms.h>
	22	#include <linux/proc_fs.h>
f98bf4aa	23	#include <linux/syscore_ops.h>
752bcb4d G	24	#include <linux/gpio.h>
752bcb4d G	25
752bcb4d G	26	#include <mach/hardware.h>
	27
	28	#include "setup.h"
	29
	30	/*
	31	* PKUnity GPIO edge detection for IRQs:
	32	* IRQs are generated on Falling-Edge, Rising-Edge, or both.
	33	* Use this instead of directly setting GRER/GFER.
	34	*/
	35	static int GPIO_IRQ_rising_edge;
	36	static int GPIO_IRQ_falling_edge;
	37	static int GPIO_IRQ_mask = 0;
	38
	39	#define GPIO_MASK(irq) (1 << (irq - IRQ_GPIO0))
	40
36a8b8c3	41	static int puv3_gpio_type(struct irq_data *d, unsigned int type)
752bcb4d G	42	{
	43	unsigned int mask;
	44
36a8b8c3 G	45	if (d->irq < IRQ_GPIOHIGH)
36a8b8c3 G	46	mask = 1 << d->irq;
752bcb4d	47	else
36a8b8c3	48	mask = GPIO_MASK(d->irq);
752bcb4d G	49
	50	if (type == IRQ_TYPE_PROBE) {
	51	if ((GPIO_IRQ_rising_edge \| GPIO_IRQ_falling_edge) & mask)
	52	return 0;
	53	type = IRQ_TYPE_EDGE_RISING \| IRQ_TYPE_EDGE_FALLING;
	54	}
	55
	56	if (type & IRQ_TYPE_EDGE_RISING)
	57	GPIO_IRQ_rising_edge \|= mask;
	58	else
	59	GPIO_IRQ_rising_edge &= ~mask;
	60	if (type & IRQ_TYPE_EDGE_FALLING)
	61	GPIO_IRQ_falling_edge \|= mask;
	62	else
	63	GPIO_IRQ_falling_edge &= ~mask;
	64
e5abf78b G	65	writel(GPIO_IRQ_rising_edge & GPIO_IRQ_mask, GPIO_GRER);
e5abf78b G	66	writel(GPIO_IRQ_falling_edge & GPIO_IRQ_mask, GPIO_GFER);
752bcb4d G	67
	68	return 0;
	69	}
	70
	71	/*
	72	* GPIO IRQs must be acknowledged. This is for IRQs from 0 to 7.
	73	*/
36a8b8c3	74	static void puv3_low_gpio_ack(struct irq_data *d)
752bcb4d	75	{
e5abf78b	76	writel((1 << d->irq), GPIO_GEDR);
752bcb4d G	77	}
752bcb4d G	78
36a8b8c3	79	static void puv3_low_gpio_mask(struct irq_data *d)
752bcb4d	80	{
e5abf78b	81	writel(readl(INTC_ICMR) & ~(1 << d->irq), INTC_ICMR);
752bcb4d G	82	}
752bcb4d G	83
36a8b8c3	84	static void puv3_low_gpio_unmask(struct irq_data *d)
752bcb4d	85	{
e5abf78b	86	writel(readl(INTC_ICMR) \| (1 << d->irq), INTC_ICMR);
752bcb4d G	87	}
752bcb4d G	88
36a8b8c3	89	static int puv3_low_gpio_wake(struct irq_data *d, unsigned int on)
752bcb4d G	90	{
752bcb4d G	91	if (on)
e5abf78b	92	writel(readl(PM_PWER) \| (1 << d->irq), PM_PWER);
752bcb4d	93	else
e5abf78b	94	writel(readl(PM_PWER) & ~(1 << d->irq), PM_PWER);
752bcb4d G	95	return 0;
	96	}
	97
	98	static struct irq_chip puv3_low_gpio_chip = {
	99	.name = "GPIO-low",
36a8b8c3 G	100	.irq_ack = puv3_low_gpio_ack,
	101	.irq_mask = puv3_low_gpio_mask,
	102	.irq_unmask = puv3_low_gpio_unmask,
	103	.irq_set_type = puv3_gpio_type,
	104	.irq_set_wake = puv3_low_gpio_wake,
752bcb4d G	105	};
	106
	107	/*
	108	* IRQ8 (GPIO0 through 27) handler. We enter here with the
	109	* irq_controller_lock held, and IRQs disabled. Decode the IRQ
	110	* and call the handler.
	111	*/
bd0b9ac4	112	static void puv3_gpio_handler(struct irq_desc *desc)
752bcb4d	113	{
f70229e2	114	unsigned int mask, irq;
752bcb4d	115
e5abf78b	116	mask = readl(GPIO_GEDR);
752bcb4d G	117	do {
	118	/*
	119	* clear down all currently active IRQ sources.
	120	* We will be processing them all.
	121	*/
e5abf78b	122	writel(mask, GPIO_GEDR);
752bcb4d G	123
	124	irq = IRQ_GPIO0;
	125	do {
	126	if (mask & 1)
	127	generic_handle_irq(irq);
	128	mask >>= 1;
	129	irq++;
	130	} while (mask);
e5abf78b	131	mask = readl(GPIO_GEDR);
752bcb4d G	132	} while (mask);
	133	}
	134
	135	/*
	136	* GPIO0-27 edge IRQs need to be handled specially.
	137	* In addition, the IRQs are all collected up into one bit in the
	138	* interrupt controller registers.
	139	*/
36a8b8c3	140	static void puv3_high_gpio_ack(struct irq_data *d)
752bcb4d	141	{
36a8b8c3	142	unsigned int mask = GPIO_MASK(d->irq);
752bcb4d	143
e5abf78b	144	writel(mask, GPIO_GEDR);
752bcb4d G	145	}
752bcb4d G	146
36a8b8c3	147	static void puv3_high_gpio_mask(struct irq_data *d)
752bcb4d	148	{
36a8b8c3	149	unsigned int mask = GPIO_MASK(d->irq);
752bcb4d G	150
	151	GPIO_IRQ_mask &= ~mask;
	152
e5abf78b G	153	writel(readl(GPIO_GRER) & ~mask, GPIO_GRER);
e5abf78b G	154	writel(readl(GPIO_GFER) & ~mask, GPIO_GFER);
752bcb4d G	155	}
752bcb4d G	156
36a8b8c3	157	static void puv3_high_gpio_unmask(struct irq_data *d)
752bcb4d	158	{
36a8b8c3	159	unsigned int mask = GPIO_MASK(d->irq);
752bcb4d G	160
	161	GPIO_IRQ_mask \|= mask;
	162
e5abf78b G	163	writel(GPIO_IRQ_rising_edge & GPIO_IRQ_mask, GPIO_GRER);
e5abf78b G	164	writel(GPIO_IRQ_falling_edge & GPIO_IRQ_mask, GPIO_GFER);
752bcb4d G	165	}
752bcb4d G	166
36a8b8c3	167	static int puv3_high_gpio_wake(struct irq_data *d, unsigned int on)
752bcb4d G	168	{
752bcb4d G	169	if (on)
e5abf78b	170	writel(readl(PM_PWER) \| PM_PWER_GPIOHIGH, PM_PWER);
752bcb4d	171	else
e5abf78b	172	writel(readl(PM_PWER) & ~PM_PWER_GPIOHIGH, PM_PWER);
752bcb4d G	173	return 0;
	174	}
	175
	176	static struct irq_chip puv3_high_gpio_chip = {
	177	.name = "GPIO-high",
36a8b8c3 G	178	.irq_ack = puv3_high_gpio_ack,
	179	.irq_mask = puv3_high_gpio_mask,
	180	.irq_unmask = puv3_high_gpio_unmask,
	181	.irq_set_type = puv3_gpio_type,
	182	.irq_set_wake = puv3_high_gpio_wake,
752bcb4d G	183	};
	184
	185	/*
	186	* We don't need to ACK IRQs on the PKUnity unless they're GPIOs
	187	* this is for internal IRQs i.e. from 8 to 31.
	188	*/
36a8b8c3	189	static void puv3_mask_irq(struct irq_data *d)
752bcb4d	190	{
e5abf78b	191	writel(readl(INTC_ICMR) & ~(1 << d->irq), INTC_ICMR);
752bcb4d G	192	}
752bcb4d G	193
36a8b8c3	194	static void puv3_unmask_irq(struct irq_data *d)
752bcb4d	195	{
e5abf78b	196	writel(readl(INTC_ICMR) \| (1 << d->irq), INTC_ICMR);
752bcb4d G	197	}
	198
	199	/*
	200	* Apart form GPIOs, only the RTC alarm can be a wakeup event.
	201	*/
36a8b8c3	202	static int puv3_set_wake(struct irq_data *d, unsigned int on)
752bcb4d	203	{
36a8b8c3	204	if (d->irq == IRQ_RTCAlarm) {
752bcb4d	205	if (on)
e5abf78b	206	writel(readl(PM_PWER) \| PM_PWER_RTC, PM_PWER);
752bcb4d	207	else
e5abf78b	208	writel(readl(PM_PWER) & ~PM_PWER_RTC, PM_PWER);
752bcb4d G	209	return 0;
	210	}
	211	return -EINVAL;
	212	}
	213
	214	static struct irq_chip puv3_normal_chip = {
	215	.name = "PKUnity-v3",
36a8b8c3 G	216	.irq_ack = puv3_mask_irq,
	217	.irq_mask = puv3_mask_irq,
	218	.irq_unmask = puv3_unmask_irq,
	219	.irq_set_wake = puv3_set_wake,
752bcb4d G	220	};
	221
	222	static struct resource irq_resource = {
	223	.name = "irqs",
1cf46c42 G	224	.start = io_v2p(PKUNITY_INTC_BASE),
1cf46c42 G	225	.end = io_v2p(PKUNITY_INTC_BASE) + 0xFFFFF,
752bcb4d G	226	};
	227
	228	static struct puv3_irq_state {
	229	unsigned int saved;
	230	unsigned int icmr;
	231	unsigned int iclr;
	232	unsigned int iccr;
	233	} puv3_irq_state;
	234
f98bf4aa	235	static int puv3_irq_suspend(void)
752bcb4d G	236	{
	237	struct puv3_irq_state *st = &puv3_irq_state;
	238
	239	st->saved = 1;
e5abf78b G	240	st->icmr = readl(INTC_ICMR);
	241	st->iclr = readl(INTC_ICLR);
	242	st->iccr = readl(INTC_ICCR);
752bcb4d G	243
	244	/*
	245	* Disable all GPIO-based interrupts.
	246	*/
e5abf78b	247	writel(readl(INTC_ICMR) & ~(0x1ff), INTC_ICMR);
752bcb4d G	248
	249	/*
	250	* Set the appropriate edges for wakeup.
	251	*/
e5abf78b G	252	writel(readl(PM_PWER) & GPIO_IRQ_rising_edge, GPIO_GRER);
e5abf78b G	253	writel(readl(PM_PWER) & GPIO_IRQ_falling_edge, GPIO_GFER);
752bcb4d G	254
	255	/*
	256	* Clear any pending GPIO interrupts.
	257	*/
e5abf78b	258	writel(readl(GPIO_GEDR), GPIO_GEDR);
752bcb4d G	259
	260	return 0;
	261	}
	262
f98bf4aa	263	static void puv3_irq_resume(void)
752bcb4d G	264	{
	265	struct puv3_irq_state *st = &puv3_irq_state;
	266
	267	if (st->saved) {
e5abf78b G	268	writel(st->iccr, INTC_ICCR);
e5abf78b G	269	writel(st->iclr, INTC_ICLR);
752bcb4d	270
e5abf78b G	271	writel(GPIO_IRQ_rising_edge & GPIO_IRQ_mask, GPIO_GRER);
e5abf78b G	272	writel(GPIO_IRQ_falling_edge & GPIO_IRQ_mask, GPIO_GFER);
752bcb4d	273
e5abf78b	274	writel(st->icmr, INTC_ICMR);
752bcb4d	275	}
752bcb4d G	276	}
752bcb4d G	277
f98bf4aa	278	static struct syscore_ops puv3_irq_syscore_ops = {
752bcb4d G	279	.suspend = puv3_irq_suspend,
	280	.resume = puv3_irq_resume,
	281	};
	282
f98bf4aa	283	static int __init puv3_irq_init_syscore(void)
752bcb4d	284	{
f98bf4aa RW	285	register_syscore_ops(&puv3_irq_syscore_ops);
f98bf4aa RW	286	return 0;
752bcb4d G	287	}
752bcb4d G	288
f98bf4aa	289	device_initcall(puv3_irq_init_syscore);
752bcb4d G	290
	291	void __init init_IRQ(void)
	292	{
	293	unsigned int irq;
	294
	295	request_resource(&iomem_resource, &irq_resource);
	296
	297	/* disable all IRQs */
e5abf78b	298	writel(0, INTC_ICMR);
752bcb4d G	299
752bcb4d G	300	/* all IRQs are IRQ, not REAL */
e5abf78b	301	writel(0, INTC_ICLR);
752bcb4d G	302
752bcb4d G	303	/* clear all GPIO edge detects */
e5abf78b G	304	writel(FMASK(8, 0) & ~FIELD(1, 1, GPI_SOFF_REQ), GPIO_GPIR);
	305	writel(0, GPIO_GFER);
	306	writel(0, GPIO_GRER);
	307	writel(0x0FFFFFFF, GPIO_GEDR);
752bcb4d	308
e5abf78b	309	writel(1, INTC_ICCR);
752bcb4d G	310
752bcb4d G	311	for (irq = 0; irq < IRQ_GPIOHIGH; irq++) {
e1f5ce81 TG	312	irq_set_chip(irq, &puv3_low_gpio_chip);
e1f5ce81 TG	313	irq_set_handler(irq, handle_edge_irq);
752bcb4d G	314	irq_modify_status(irq,
	315	IRQ_NOREQUEST \| IRQ_NOPROBE \| IRQ_NOAUTOEN,
	316	0);
	317	}
	318
	319	for (irq = IRQ_GPIOHIGH + 1; irq < IRQ_GPIO0; irq++) {
e1f5ce81 TG	320	irq_set_chip(irq, &puv3_normal_chip);
e1f5ce81 TG	321	irq_set_handler(irq, handle_level_irq);
752bcb4d G	322	irq_modify_status(irq,
	323	IRQ_NOREQUEST \| IRQ_NOAUTOEN,
	324	IRQ_NOPROBE);
	325	}
	326
	327	for (irq = IRQ_GPIO0; irq <= IRQ_GPIO27; irq++) {
e1f5ce81 TG	328	irq_set_chip(irq, &puv3_high_gpio_chip);
e1f5ce81 TG	329	irq_set_handler(irq, handle_edge_irq);
752bcb4d G	330	irq_modify_status(irq,
	331	IRQ_NOREQUEST \| IRQ_NOPROBE \| IRQ_NOAUTOEN,
	332	0);
	333	}
	334
	335	/*
	336	* Install handler for GPIO 0-27 edge detect interrupts
	337	*/
e1f5ce81 TG	338	irq_set_chip(IRQ_GPIOHIGH, &puv3_normal_chip);
e1f5ce81 TG	339	irq_set_chained_handler(IRQ_GPIOHIGH, puv3_gpio_handler);
752bcb4d G	340
	341	#ifdef CONFIG_PUV3_GPIO
	342	puv3_init_gpio();
	343	#endif
	344	}
	345
752bcb4d G	346	/*
	347	* do_IRQ handles all hardware IRQ's. Decoded IRQs should not
	348	* come via this function. Instead, they should provide their
	349	* own 'handler'
	350	*/
	351	asmlinkage void asm_do_IRQ(unsigned int irq, struct pt_regs *regs)
	352	{
	353	struct pt_regs *old_regs = set_irq_regs(regs);
	354
	355	irq_enter();
	356
	357	/*
	358	* Some hardware gives randomly wrong interrupts. Rather
	359	* than crashing, do something sensible.
	360	*/
	361	if (unlikely(irq >= nr_irqs)) {
	362	if (printk_ratelimit())
	363	printk(KERN_WARNING "Bad IRQ%u\n", irq);
	364	ack_bad_irq(irq);
	365	} else {
	366	generic_handle_irq(irq);
	367	}
	368
	369	irq_exit();
	370	set_irq_regs(old_regs);
	371	}
	372