drivers/sh/intc/core.c - maze/linux - Git at Google

 /*
  * Shared interrupt handling code for IPR and INTC2 types of IRQs.
  *
  * Copyright (C) 2007, 2008 Magnus Damm
  * Copyright (C) 2009, 2010 Paul Mundt
  *
  * Based on intc2.c and ipr.c
  *
  * Copyright (C) 1999  Niibe Yutaka & Takeshi Yaegashi
  * Copyright (C) 2000  Kazumoto Kojima
  * Copyright (C) 2001  David J. Mckay (david.mckay@st.com)
  * Copyright (C) 2003  Takashi Kusuda <kusuda-takashi@hitachi-ul.co.jp>
  * Copyright (C) 2005, 2006  Paul Mundt
  *
  * 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.
  */
 #define pr_fmt(fmt) "intc: " fmt

 #include <linux/init.h>
 #include <linux/irq.h>
 #include <linux/io.h>
 #include <linux/slab.h>
 #include <linux/interrupt.h>
 #include <linux/sh_intc.h>
 #include <linux/sysdev.h>
 #include <linux/list.h>
 #include <linux/spinlock.h>
 #include <linux/radix-tree.h>
 #include "internals.h"

 LIST_HEAD(intc_list);
 DEFINE_RAW_SPINLOCK(intc_big_lock);
 unsigned int nr_intc_controllers;

 /*
  * Default priority level
  * - this needs to be at least 2 for 5-bit priorities on 7780
  */
 static unsigned int default_prio_level = 2;	/* 2 - 16 */
 static unsigned int intc_prio_level[NR_IRQS];	/* for now */

 unsigned int intc_get_dfl_prio_level(void)
 {
 	return default_prio_level;
 }

 unsigned int intc_get_prio_level(unsigned int irq)
 {
 	return intc_prio_level[irq];
 }

 void intc_set_prio_level(unsigned int irq, unsigned int level)
 {
 	unsigned long flags;

 	raw_spin_lock_irqsave(&intc_big_lock, flags);
 	intc_prio_level[irq] = level;
 	raw_spin_unlock_irqrestore(&intc_big_lock, flags);
 }

 static void intc_redirect_irq(unsigned int irq, struct irq_desc *desc)
 {
 	generic_handle_irq((unsigned int)get_irq_data(irq));
 }

 static void __init intc_register_irq(struct intc_desc *desc,
 				     struct intc_desc_int *d,
 				     intc_enum enum_id,
 				     unsigned int irq)
 {
 	struct intc_handle_int *hp;
 	unsigned int data[2], primary;
 	unsigned long flags;

 	/*
 	 * Register the IRQ position with the global IRQ map, then insert
 	 * it in to the radix tree.
 	 */
 	reserve_irq_vector(irq);

 	raw_spin_lock_irqsave(&intc_big_lock, flags);
 	radix_tree_insert(&d->tree, enum_id, intc_irq_xlate_get(irq));
 	raw_spin_unlock_irqrestore(&intc_big_lock, flags);

 	/*
 	 * Prefer single interrupt source bitmap over other combinations:
 	 *
 	 * 1. bitmap, single interrupt source
 	 * 2. priority, single interrupt source
 	 * 3. bitmap, multiple interrupt sources (groups)
 	 * 4. priority, multiple interrupt sources (groups)
 	 */
 	data[0] = intc_get_mask_handle(desc, d, enum_id, 0);
 	data[1] = intc_get_prio_handle(desc, d, enum_id, 0);

 	primary = 0;
 	if (!data[0] && data[1])
 		primary = 1;

 	if (!data[0] && !data[1])
 		pr_warning("missing unique irq mask for irq %d (vect 0x%04x)\n",
 			   irq, irq2evt(irq));

 	data[0] = data[0] ? data[0] : intc_get_mask_handle(desc, d, enum_id, 1);
 	data[1] = data[1] ? data[1] : intc_get_prio_handle(desc, d, enum_id, 1);

 	if (!data[primary])
 		primary ^= 1;

 	BUG_ON(!data[primary]); /* must have primary masking method */

 	disable_irq_nosync(irq);
 	set_irq_chip_and_handler_name(irq, &d->chip,
 				      handle_level_irq, "level");
 	set_irq_chip_data(irq, (void *)data[primary]);

 	/*
 	 * set priority level
 	 */
 	intc_set_prio_level(irq, intc_get_dfl_prio_level());

 	/* enable secondary masking method if present */
 	if (data[!primary])
 		_intc_enable(irq, data[!primary]);

 	/* add irq to d->prio list if priority is available */
 	if (data[1]) {
 		hp = d->prio + d->nr_prio;
 		hp->irq = irq;
 		hp->handle = data[1];

 		if (primary) {
 			/*
 			 * only secondary priority should access registers, so
 			 * set _INTC_FN(h) = REG_FN_ERR for intc_set_priority()
 			 */
 			hp->handle &= ~_INTC_MK(0x0f, 0, 0, 0, 0, 0);
 			hp->handle |= _INTC_MK(REG_FN_ERR, 0, 0, 0, 0, 0);
 		}
 		d->nr_prio++;
 	}

 	/* add irq to d->sense list if sense is available */
 	data[0] = intc_get_sense_handle(desc, d, enum_id);
 	if (data[0]) {
 		(d->sense + d->nr_sense)->irq = irq;
 		(d->sense + d->nr_sense)->handle = data[0];
 		d->nr_sense++;
 	}

 	/* irq should be disabled by default */
 	d->chip.mask(irq);

 	intc_set_ack_handle(irq, desc, d, enum_id);
 	intc_set_dist_handle(irq, desc, d, enum_id);

 	activate_irq(irq);
 }

 static unsigned int __init save_reg(struct intc_desc_int *d,
 				    unsigned int cnt,
 				    unsigned long value,
 				    unsigned int smp)
 {
 	if (value) {
 		value = intc_phys_to_virt(d, value);

 		d->reg[cnt] = value;
 #ifdef CONFIG_SMP
 		d->smp[cnt] = smp;
 #endif
 		return 1;
 	}

 	return 0;
 }

 int __init register_intc_controller(struct intc_desc *desc)
 {
 	unsigned int i, k, smp;
 	struct intc_hw_desc *hw = &desc->hw;
 	struct intc_desc_int *d;
 	struct resource *res;

 	pr_info("Registered controller '%s' with %u IRQs\n",
 		desc->name, hw->nr_vectors);

 	d = kzalloc(sizeof(*d), GFP_NOWAIT);
 	if (!d)
 		goto err0;

 	INIT_LIST_HEAD(&d->list);
 	list_add_tail(&d->list, &intc_list);

 	raw_spin_lock_init(&d->lock);

 	d->index = nr_intc_controllers;

 	if (desc->num_resources) {
 		d->nr_windows = desc->num_resources;
 		d->window = kzalloc(d->nr_windows * sizeof(*d->window),
 				    GFP_NOWAIT);
 		if (!d->window)
 			goto err1;

 		for (k = 0; k < d->nr_windows; k++) {
 			res = desc->resource + k;
 			WARN_ON(resource_type(res) != IORESOURCE_MEM);
 			d->window[k].phys = res->start;
 			d->window[k].size = resource_size(res);
 			d->window[k].virt = ioremap_nocache(res->start,
 							 resource_size(res));
 			if (!d->window[k].virt)
 				goto err2;
 		}
 	}

 	d->nr_reg = hw->mask_regs ? hw->nr_mask_regs * 2 : 0;
 #ifdef CONFIG_INTC_BALANCING
 	if (d->nr_reg)
 		d->nr_reg += hw->nr_mask_regs;
 #endif
 	d->nr_reg += hw->prio_regs ? hw->nr_prio_regs * 2 : 0;
 	d->nr_reg += hw->sense_regs ? hw->nr_sense_regs : 0;
 	d->nr_reg += hw->ack_regs ? hw->nr_ack_regs : 0;
 	d->nr_reg += hw->subgroups ? hw->nr_subgroups : 0;

 	d->reg = kzalloc(d->nr_reg * sizeof(*d->reg), GFP_NOWAIT);
 	if (!d->reg)
 		goto err2;

 #ifdef CONFIG_SMP
 	d->smp = kzalloc(d->nr_reg * sizeof(*d->smp), GFP_NOWAIT);
 	if (!d->smp)
 		goto err3;
 #endif
 	k = 0;

 	if (hw->mask_regs) {
 		for (i = 0; i < hw->nr_mask_regs; i++) {
 			smp = IS_SMP(hw->mask_regs[i]);
 			k += save_reg(d, k, hw->mask_regs[i].set_reg, smp);
 			k += save_reg(d, k, hw->mask_regs[i].clr_reg, smp);
 #ifdef CONFIG_INTC_BALANCING
 			k += save_reg(d, k, hw->mask_regs[i].dist_reg, 0);
 #endif
 		}
 	}

 	if (hw->prio_regs) {
 		d->prio = kzalloc(hw->nr_vectors * sizeof(*d->prio),
 				  GFP_NOWAIT);
 		if (!d->prio)
 			goto err4;

 		for (i = 0; i < hw->nr_prio_regs; i++) {
 			smp = IS_SMP(hw->prio_regs[i]);
 			k += save_reg(d, k, hw->prio_regs[i].set_reg, smp);
 			k += save_reg(d, k, hw->prio_regs[i].clr_reg, smp);
 		}
 	}

 	if (hw->sense_regs) {
 		d->sense = kzalloc(hw->nr_vectors * sizeof(*d->sense),
 				   GFP_NOWAIT);
 		if (!d->sense)
 			goto err5;

 		for (i = 0; i < hw->nr_sense_regs; i++)
 			k += save_reg(d, k, hw->sense_regs[i].reg, 0);
 	}

 	if (hw->subgroups)
 		for (i = 0; i < hw->nr_subgroups; i++)
 			if (hw->subgroups[i].reg)
 				k+= save_reg(d, k, hw->subgroups[i].reg, 0);

 	memcpy(&d->chip, &intc_irq_chip, sizeof(struct irq_chip));
 	d->chip.name = desc->name;

 	if (hw->ack_regs)
 		for (i = 0; i < hw->nr_ack_regs; i++)
 			k += save_reg(d, k, hw->ack_regs[i].set_reg, 0);
 	else
 		d->chip.mask_ack = d->chip.disable;

 	/* disable bits matching force_disable before registering irqs */
 	if (desc->force_disable)
 		intc_enable_disable_enum(desc, d, desc->force_disable, 0);

 	/* disable bits matching force_enable before registering irqs */
 	if (desc->force_enable)
 		intc_enable_disable_enum(desc, d, desc->force_enable, 0);

 	BUG_ON(k > 256); /* _INTC_ADDR_E() and _INTC_ADDR_D() are 8 bits */

 	/* register the vectors one by one */
 	for (i = 0; i < hw->nr_vectors; i++) {
 		struct intc_vect *vect = hw->vectors + i;
 		unsigned int irq = evt2irq(vect->vect);
 		struct irq_desc *irq_desc;

 		if (!vect->enum_id)
 			continue;

 		irq_desc = irq_to_desc_alloc_node(irq, numa_node_id());
 		if (unlikely(!irq_desc)) {
 			pr_err("can't get irq_desc for %d\n", irq);
 			continue;
 		}

 		intc_irq_xlate_set(irq, vect->enum_id, d);
 		intc_register_irq(desc, d, vect->enum_id, irq);

 		for (k = i + 1; k < hw->nr_vectors; k++) {
 			struct intc_vect *vect2 = hw->vectors + k;
 			unsigned int irq2 = evt2irq(vect2->vect);

 			if (vect->enum_id != vect2->enum_id)
 				continue;

 			/*
 			 * In the case of multi-evt handling and sparse
 			 * IRQ support, each vector still needs to have
 			 * its own backing irq_desc.
 			 */
 			irq_desc = irq_to_desc_alloc_node(irq2, numa_node_id());
 			if (unlikely(!irq_desc)) {
 				pr_err("can't get irq_desc for %d\n", irq2);
 				continue;
 			}

 			vect2->enum_id = 0;

 			/* redirect this interrupts to the first one */
 			set_irq_chip(irq2, &dummy_irq_chip);
 			set_irq_chained_handler(irq2, intc_redirect_irq);
 			set_irq_data(irq2, (void *)irq);
 		}
 	}

 	intc_subgroup_init(desc, d);

 	/* enable bits matching force_enable after registering irqs */
 	if (desc->force_enable)
 		intc_enable_disable_enum(desc, d, desc->force_enable, 1);

 	nr_intc_controllers++;

 	return 0;
 err5:
 	kfree(d->prio);
 err4:
 #ifdef CONFIG_SMP
 	kfree(d->smp);
 err3:
 #endif
 	kfree(d->reg);
 err2:
 	for (k = 0; k < d->nr_windows; k++)
 		if (d->window[k].virt)
 			iounmap(d->window[k].virt);

 	kfree(d->window);
 err1:
 	kfree(d);
 err0:
 	pr_err("unable to allocate INTC memory\n");

 	return -ENOMEM;
 }

 static ssize_t
 show_intc_name(struct sys_device *dev, struct sysdev_attribute *attr, char *buf)
 {
 	struct intc_desc_int *d;

 	d = container_of(dev, struct intc_desc_int, sysdev);

 	return sprintf(buf, "%s\n", d->chip.name);
 }

 static SYSDEV_ATTR(name, S_IRUGO, show_intc_name, NULL);

 static int intc_suspend(struct sys_device *dev, pm_message_t state)
 {
 	struct intc_desc_int *d;
 	struct irq_desc *desc;
 	int irq;

 	/* get intc controller associated with this sysdev */
 	d = container_of(dev, struct intc_desc_int, sysdev);

 	switch (state.event) {
 	case PM_EVENT_ON:
 		if (d->state.event != PM_EVENT_FREEZE)
 			break;

 		for_each_irq_desc(irq, desc) {
 			/*
 			 * This will catch the redirect and VIRQ cases
 			 * due to the dummy_irq_chip being inserted.
 			 */
 			if (desc->chip != &d->chip)
 				continue;
 			if (desc->status & IRQ_DISABLED)
 				desc->chip->disable(irq);
 			else
 				desc->chip->enable(irq);
 		}
 		break;
 	case PM_EVENT_FREEZE:
 		/* nothing has to be done */
 		break;
 	case PM_EVENT_SUSPEND:
 		/* enable wakeup irqs belonging to this intc controller */
 		for_each_irq_desc(irq, desc) {
 			if (desc->chip != &d->chip)
 				continue;
 			if ((desc->status & IRQ_WAKEUP))
 				desc->chip->enable(irq);
 		}
 		break;
 	}

 	d->state = state;

 	return 0;
 }

 static int intc_resume(struct sys_device *dev)
 {
 	return intc_suspend(dev, PMSG_ON);
 }

 struct sysdev_class intc_sysdev_class = {
 	.name		= "intc",
 	.suspend	= intc_suspend,
 	.resume		= intc_resume,
 };

 /* register this intc as sysdev to allow suspend/resume */
 static int __init register_intc_sysdevs(void)
 {
 	struct intc_desc_int *d;
 	int error;

 	error = sysdev_class_register(&intc_sysdev_class);
 	if (!error) {
 		list_for_each_entry(d, &intc_list, list) {
 			d->sysdev.id = d->index;
 			d->sysdev.cls = &intc_sysdev_class;
 			error = sysdev_register(&d->sysdev);
 			if (error == 0)
 				error = sysdev_create_file(&d->sysdev,
 							   &attr_name);
 			if (error)
 				break;
 		}
 	}

 	if (error)
 		pr_err("sysdev registration error\n");

 	return error;
 }
 device_initcall(register_intc_sysdevs);
	/*
	* Shared interrupt handling code for IPR and INTC2 types of IRQs.
	*
	* Copyright (C) 2007, 2008 Magnus Damm
	* Copyright (C) 2009, 2010 Paul Mundt
	*
	* Based on intc2.c and ipr.c
	*
	* Copyright (C) 1999 Niibe Yutaka & Takeshi Yaegashi
	* Copyright (C) 2000 Kazumoto Kojima
	* Copyright (C) 2001 David J. Mckay (david.mckay@st.com)
	* Copyright (C) 2003 Takashi Kusuda <kusuda-takashi@hitachi-ul.co.jp>
	* Copyright (C) 2005, 2006 Paul Mundt
	*
	* 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.
	*/
	#define pr_fmt(fmt) "intc: " fmt

	#include <linux/init.h>
	#include <linux/irq.h>
	#include <linux/io.h>
	#include <linux/slab.h>
	#include <linux/interrupt.h>
	#include <linux/sh_intc.h>
	#include <linux/sysdev.h>
	#include <linux/list.h>
	#include <linux/spinlock.h>
	#include <linux/radix-tree.h>
	#include "internals.h"

	LIST_HEAD(intc_list);
	DEFINE_RAW_SPINLOCK(intc_big_lock);
	unsigned int nr_intc_controllers;

	/*
	* Default priority level
	* - this needs to be at least 2 for 5-bit priorities on 7780
	*/
	static unsigned int default_prio_level = 2; /* 2 - 16 */
	static unsigned int intc_prio_level[NR_IRQS]; /* for now */

	unsigned int intc_get_dfl_prio_level(void)
	{
	return default_prio_level;
	}

	unsigned int intc_get_prio_level(unsigned int irq)
	{
	return intc_prio_level[irq];
	}

	void intc_set_prio_level(unsigned int irq, unsigned int level)
	{
	unsigned long flags;

	raw_spin_lock_irqsave(&intc_big_lock, flags);
	intc_prio_level[irq] = level;
	raw_spin_unlock_irqrestore(&intc_big_lock, flags);
	}

	static void intc_redirect_irq(unsigned int irq, struct irq_desc *desc)
	{
	generic_handle_irq((unsigned int)get_irq_data(irq));
	}

	static void __init intc_register_irq(struct intc_desc *desc,
	struct intc_desc_int *d,
	intc_enum enum_id,
	unsigned int irq)
	{
	struct intc_handle_int *hp;
	unsigned int data[2], primary;
	unsigned long flags;

	/*
	* Register the IRQ position with the global IRQ map, then insert
	* it in to the radix tree.
	*/
	reserve_irq_vector(irq);

	raw_spin_lock_irqsave(&intc_big_lock, flags);
	radix_tree_insert(&d->tree, enum_id, intc_irq_xlate_get(irq));
	raw_spin_unlock_irqrestore(&intc_big_lock, flags);

	/*
	* Prefer single interrupt source bitmap over other combinations:
	*
	* 1. bitmap, single interrupt source
	* 2. priority, single interrupt source
	* 3. bitmap, multiple interrupt sources (groups)
	* 4. priority, multiple interrupt sources (groups)
	*/
	data[0] = intc_get_mask_handle(desc, d, enum_id, 0);
	data[1] = intc_get_prio_handle(desc, d, enum_id, 0);

	primary = 0;
	if (!data[0] && data[1])
	primary = 1;

	if (!data[0] && !data[1])
	pr_warning("missing unique irq mask for irq %d (vect 0x%04x)\n",
	irq, irq2evt(irq));

	data[0] = data[0] ? data[0] : intc_get_mask_handle(desc, d, enum_id, 1);
	data[1] = data[1] ? data[1] : intc_get_prio_handle(desc, d, enum_id, 1);

	if (!data[primary])
	primary ^= 1;

	BUG_ON(!data[primary]); /* must have primary masking method */

	disable_irq_nosync(irq);
	set_irq_chip_and_handler_name(irq, &d->chip,
	handle_level_irq, "level");
	set_irq_chip_data(irq, (void *)data[primary]);

	/*
	* set priority level
	*/
	intc_set_prio_level(irq, intc_get_dfl_prio_level());

	/* enable secondary masking method if present */
	if (data[!primary])
	_intc_enable(irq, data[!primary]);

	/* add irq to d->prio list if priority is available */
	if (data[1]) {
	hp = d->prio + d->nr_prio;
	hp->irq = irq;
	hp->handle = data[1];

	if (primary) {
	/*
	* only secondary priority should access registers, so
	* set _INTC_FN(h) = REG_FN_ERR for intc_set_priority()
	*/
	hp->handle &= ~_INTC_MK(0x0f, 0, 0, 0, 0, 0);
	hp->handle \|= _INTC_MK(REG_FN_ERR, 0, 0, 0, 0, 0);
	}
	d->nr_prio++;
	}

	/* add irq to d->sense list if sense is available */
	data[0] = intc_get_sense_handle(desc, d, enum_id);
	if (data[0]) {
	(d->sense + d->nr_sense)->irq = irq;
	(d->sense + d->nr_sense)->handle = data[0];
	d->nr_sense++;
	}

	/* irq should be disabled by default */
	d->chip.mask(irq);

	intc_set_ack_handle(irq, desc, d, enum_id);
	intc_set_dist_handle(irq, desc, d, enum_id);

	activate_irq(irq);
	}

	static unsigned int __init save_reg(struct intc_desc_int *d,
	unsigned int cnt,
	unsigned long value,
	unsigned int smp)
	{
	if (value) {
	value = intc_phys_to_virt(d, value);

	d->reg[cnt] = value;
	#ifdef CONFIG_SMP
	d->smp[cnt] = smp;
	#endif
	return 1;
	}

	return 0;
	}

	int __init register_intc_controller(struct intc_desc *desc)
	{
	unsigned int i, k, smp;
	struct intc_hw_desc *hw = &desc->hw;
	struct intc_desc_int *d;
	struct resource *res;

	pr_info("Registered controller '%s' with %u IRQs\n",
	desc->name, hw->nr_vectors);

	d = kzalloc(sizeof(*d), GFP_NOWAIT);
	if (!d)
	goto err0;

	INIT_LIST_HEAD(&d->list);
	list_add_tail(&d->list, &intc_list);

	raw_spin_lock_init(&d->lock);

	d->index = nr_intc_controllers;

	if (desc->num_resources) {
	d->nr_windows = desc->num_resources;
	d->window = kzalloc(d->nr_windows * sizeof(*d->window),
	GFP_NOWAIT);
	if (!d->window)
	goto err1;

	for (k = 0; k < d->nr_windows; k++) {
	res = desc->resource + k;
	WARN_ON(resource_type(res) != IORESOURCE_MEM);
	d->window[k].phys = res->start;
	d->window[k].size = resource_size(res);
	d->window[k].virt = ioremap_nocache(res->start,
	resource_size(res));
	if (!d->window[k].virt)
	goto err2;
	}
	}

	d->nr_reg = hw->mask_regs ? hw->nr_mask_regs * 2 : 0;
	#ifdef CONFIG_INTC_BALANCING
	if (d->nr_reg)
	d->nr_reg += hw->nr_mask_regs;
	#endif
	d->nr_reg += hw->prio_regs ? hw->nr_prio_regs * 2 : 0;
	d->nr_reg += hw->sense_regs ? hw->nr_sense_regs : 0;
	d->nr_reg += hw->ack_regs ? hw->nr_ack_regs : 0;
	d->nr_reg += hw->subgroups ? hw->nr_subgroups : 0;

	d->reg = kzalloc(d->nr_reg * sizeof(*d->reg), GFP_NOWAIT);
	if (!d->reg)
	goto err2;

	#ifdef CONFIG_SMP
	d->smp = kzalloc(d->nr_reg * sizeof(*d->smp), GFP_NOWAIT);
	if (!d->smp)
	goto err3;
	#endif
	k = 0;

	if (hw->mask_regs) {
	for (i = 0; i < hw->nr_mask_regs; i++) {
	smp = IS_SMP(hw->mask_regs[i]);
	k += save_reg(d, k, hw->mask_regs[i].set_reg, smp);
	k += save_reg(d, k, hw->mask_regs[i].clr_reg, smp);
	#ifdef CONFIG_INTC_BALANCING
	k += save_reg(d, k, hw->mask_regs[i].dist_reg, 0);
	#endif
	}
	}

	if (hw->prio_regs) {
	d->prio = kzalloc(hw->nr_vectors * sizeof(*d->prio),
	GFP_NOWAIT);
	if (!d->prio)
	goto err4;

	for (i = 0; i < hw->nr_prio_regs; i++) {
	smp = IS_SMP(hw->prio_regs[i]);
	k += save_reg(d, k, hw->prio_regs[i].set_reg, smp);
	k += save_reg(d, k, hw->prio_regs[i].clr_reg, smp);
	}
	}

	if (hw->sense_regs) {
	d->sense = kzalloc(hw->nr_vectors * sizeof(*d->sense),
	GFP_NOWAIT);
	if (!d->sense)
	goto err5;

	for (i = 0; i < hw->nr_sense_regs; i++)
	k += save_reg(d, k, hw->sense_regs[i].reg, 0);
	}

	if (hw->subgroups)
	for (i = 0; i < hw->nr_subgroups; i++)
	if (hw->subgroups[i].reg)
	k+= save_reg(d, k, hw->subgroups[i].reg, 0);

	memcpy(&d->chip, &intc_irq_chip, sizeof(struct irq_chip));
	d->chip.name = desc->name;

	if (hw->ack_regs)
	for (i = 0; i < hw->nr_ack_regs; i++)
	k += save_reg(d, k, hw->ack_regs[i].set_reg, 0);
	else
	d->chip.mask_ack = d->chip.disable;

	/* disable bits matching force_disable before registering irqs */
	if (desc->force_disable)
	intc_enable_disable_enum(desc, d, desc->force_disable, 0);

	/* disable bits matching force_enable before registering irqs */
	if (desc->force_enable)
	intc_enable_disable_enum(desc, d, desc->force_enable, 0);

	BUG_ON(k > 256); /* _INTC_ADDR_E() and _INTC_ADDR_D() are 8 bits */

	/* register the vectors one by one */
	for (i = 0; i < hw->nr_vectors; i++) {
	struct intc_vect *vect = hw->vectors + i;
	unsigned int irq = evt2irq(vect->vect);
	struct irq_desc *irq_desc;

	if (!vect->enum_id)
	continue;

	irq_desc = irq_to_desc_alloc_node(irq, numa_node_id());
	if (unlikely(!irq_desc)) {
	pr_err("can't get irq_desc for %d\n", irq);
	continue;
	}

	intc_irq_xlate_set(irq, vect->enum_id, d);
	intc_register_irq(desc, d, vect->enum_id, irq);

	for (k = i + 1; k < hw->nr_vectors; k++) {
	struct intc_vect *vect2 = hw->vectors + k;
	unsigned int irq2 = evt2irq(vect2->vect);

	if (vect->enum_id != vect2->enum_id)
	continue;

	/*
	* In the case of multi-evt handling and sparse
	* IRQ support, each vector still needs to have
	* its own backing irq_desc.
	*/
	irq_desc = irq_to_desc_alloc_node(irq2, numa_node_id());
	if (unlikely(!irq_desc)) {
	pr_err("can't get irq_desc for %d\n", irq2);
	continue;
	}

	vect2->enum_id = 0;

	/* redirect this interrupts to the first one */
	set_irq_chip(irq2, &dummy_irq_chip);
	set_irq_chained_handler(irq2, intc_redirect_irq);
	set_irq_data(irq2, (void *)irq);
	}
	}

	intc_subgroup_init(desc, d);

	/* enable bits matching force_enable after registering irqs */
	if (desc->force_enable)
	intc_enable_disable_enum(desc, d, desc->force_enable, 1);

	nr_intc_controllers++;

	return 0;
	err5:
	kfree(d->prio);
	err4:
	#ifdef CONFIG_SMP
	kfree(d->smp);
	err3:
	#endif
	kfree(d->reg);
	err2:
	for (k = 0; k < d->nr_windows; k++)
	if (d->window[k].virt)
	iounmap(d->window[k].virt);

	kfree(d->window);
	err1:
	kfree(d);
	err0:
	pr_err("unable to allocate INTC memory\n");

	return -ENOMEM;
	}

	static ssize_t
	show_intc_name(struct sys_device dev, struct sysdev_attribute attr, char *buf)
	{
	struct intc_desc_int *d;

	d = container_of(dev, struct intc_desc_int, sysdev);

	return sprintf(buf, "%s\n", d->chip.name);
	}

	static SYSDEV_ATTR(name, S_IRUGO, show_intc_name, NULL);

	static int intc_suspend(struct sys_device *dev, pm_message_t state)
	{
	struct intc_desc_int *d;
	struct irq_desc *desc;
	int irq;

	/* get intc controller associated with this sysdev */
	d = container_of(dev, struct intc_desc_int, sysdev);

	switch (state.event) {
	case PM_EVENT_ON:
	if (d->state.event != PM_EVENT_FREEZE)
	break;

	for_each_irq_desc(irq, desc) {
	/*
	* This will catch the redirect and VIRQ cases
	* due to the dummy_irq_chip being inserted.
	*/
	if (desc->chip != &d->chip)
	continue;
	if (desc->status & IRQ_DISABLED)
	desc->chip->disable(irq);
	else
	desc->chip->enable(irq);
	}
	break;
	case PM_EVENT_FREEZE:
	/* nothing has to be done */
	break;
	case PM_EVENT_SUSPEND:
	/* enable wakeup irqs belonging to this intc controller */
	for_each_irq_desc(irq, desc) {
	if (desc->chip != &d->chip)
	continue;
	if ((desc->status & IRQ_WAKEUP))
	desc->chip->enable(irq);
	}
	break;
	}

	d->state = state;

	return 0;
	}

	static int intc_resume(struct sys_device *dev)
	{
	return intc_suspend(dev, PMSG_ON);
	}

	struct sysdev_class intc_sysdev_class = {
	.name = "intc",
	.suspend = intc_suspend,
	.resume = intc_resume,
	};

	/* register this intc as sysdev to allow suspend/resume */
	static int __init register_intc_sysdevs(void)
	{
	struct intc_desc_int *d;
	int error;

	error = sysdev_class_register(&intc_sysdev_class);
	if (!error) {
	list_for_each_entry(d, &intc_list, list) {
	d->sysdev.id = d->index;
	d->sysdev.cls = &intc_sysdev_class;
	error = sysdev_register(&d->sysdev);
	if (error == 0)
	error = sysdev_create_file(&d->sysdev,
	&attr_name);
	if (error)
	break;
	}
	}

	if (error)
	pr_err("sysdev registration error\n");

	return error;
	}
	device_initcall(register_intc_sysdevs);