drivers/irqchip/irq-omap-intc.c - LeafOS-Devices/android_kernel_samsung_gta4xl - Gitiles

 /*
  * linux/arch/arm/mach-omap2/irq.c
  *
  * Interrupt handler for OMAP2 boards.
  *
  * Copyright (C) 2005 Nokia Corporation
  * Author: Paul Mundt <paul.mundt@nokia.com>
  *
  * 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.
  */
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>

 #include <asm/exception.h>
 #include <linux/irqchip.h>
 #include <linux/irqdomain.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
 #include <linux/of_irq.h>

 #include <linux/irqchip/irq-omap-intc.h>

 /* Define these here for now until we drop all board-files */
 #define OMAP24XX_IC_BASE	0x480fe000
 #define OMAP34XX_IC_BASE	0x48200000

 /* selected INTC register offsets */

 #define INTC_REVISION		0x0000
 #define INTC_SYSCONFIG		0x0010
 #define INTC_SYSSTATUS		0x0014
 #define INTC_SIR		0x0040
 #define INTC_CONTROL		0x0048
 #define INTC_PROTECTION		0x004C
 #define INTC_IDLE		0x0050
 #define INTC_THRESHOLD		0x0068
 #define INTC_MIR0		0x0084
 #define INTC_MIR_CLEAR0		0x0088
 #define INTC_MIR_SET0		0x008c
 #define INTC_PENDING_IRQ0	0x0098
 #define INTC_PENDING_IRQ1	0x00b8
 #define INTC_PENDING_IRQ2	0x00d8
 #define INTC_PENDING_IRQ3	0x00f8
 #define INTC_ILR0		0x0100

 #define ACTIVEIRQ_MASK		0x7f	/* omap2/3 active interrupt bits */
 #define SPURIOUSIRQ_MASK	(0x1ffffff << 7)
 #define INTCPS_NR_ILR_REGS	128
 #define INTCPS_NR_MIR_REGS	4

 #define INTC_IDLE_FUNCIDLE	(1 << 0)
 #define INTC_IDLE_TURBO		(1 << 1)

 #define INTC_PROTECTION_ENABLE	(1 << 0)

 struct omap_intc_regs {
 	u32 sysconfig;
 	u32 protection;
 	u32 idle;
 	u32 threshold;
 	u32 ilr[INTCPS_NR_ILR_REGS];
 	u32 mir[INTCPS_NR_MIR_REGS];
 };
 static struct omap_intc_regs intc_context;

 static struct irq_domain *domain;
 static void __iomem *omap_irq_base;
 static int omap_nr_pending = 3;
 static int omap_nr_irqs = 96;

 static void intc_writel(u32 reg, u32 val)
 {
 	writel_relaxed(val, omap_irq_base + reg);
 }

 static u32 intc_readl(u32 reg)
 {
 	return readl_relaxed(omap_irq_base + reg);
 }

 void omap_intc_save_context(void)
 {
 	int i;

 	intc_context.sysconfig =
 		intc_readl(INTC_SYSCONFIG);
 	intc_context.protection =
 		intc_readl(INTC_PROTECTION);
 	intc_context.idle =
 		intc_readl(INTC_IDLE);
 	intc_context.threshold =
 		intc_readl(INTC_THRESHOLD);

 	for (i = 0; i < omap_nr_irqs; i++)
 		intc_context.ilr[i] =
 			intc_readl((INTC_ILR0 + 0x4 * i));
 	for (i = 0; i < INTCPS_NR_MIR_REGS; i++)
 		intc_context.mir[i] =
 			intc_readl(INTC_MIR0 + (0x20 * i));
 }

 void omap_intc_restore_context(void)
 {
 	int i;

 	intc_writel(INTC_SYSCONFIG, intc_context.sysconfig);
 	intc_writel(INTC_PROTECTION, intc_context.protection);
 	intc_writel(INTC_IDLE, intc_context.idle);
 	intc_writel(INTC_THRESHOLD, intc_context.threshold);

 	for (i = 0; i < omap_nr_irqs; i++)
 		intc_writel(INTC_ILR0 + 0x4 * i,
 				intc_context.ilr[i]);

 	for (i = 0; i < INTCPS_NR_MIR_REGS; i++)
 		intc_writel(INTC_MIR0 + 0x20 * i,
 			intc_context.mir[i]);
 	/* MIRs are saved and restore with other PRCM registers */
 }

 void omap3_intc_prepare_idle(void)
 {
 	/*
 	 * Disable autoidle as it can stall interrupt controller,
 	 * cf. errata ID i540 for 3430 (all revisions up to 3.1.x)
 	 */
 	intc_writel(INTC_SYSCONFIG, 0);
 	intc_writel(INTC_IDLE, INTC_IDLE_TURBO);
 }

 void omap3_intc_resume_idle(void)
 {
 	/* Re-enable autoidle */
 	intc_writel(INTC_SYSCONFIG, 1);
 	intc_writel(INTC_IDLE, 0);
 }

 /* XXX: FIQ and additional INTC support (only MPU at the moment) */
 static void omap_ack_irq(struct irq_data *d)
 {
 	intc_writel(INTC_CONTROL, 0x1);
 }

 static void omap_mask_ack_irq(struct irq_data *d)
 {
 	irq_gc_mask_disable_reg(d);
 	omap_ack_irq(d);
 }

 static void __init omap_irq_soft_reset(void)
 {
 	unsigned long tmp;

 	tmp = intc_readl(INTC_REVISION) & 0xff;

 	pr_info("IRQ: Found an INTC at 0x%p (revision %ld.%ld) with %d interrupts\n",
 		omap_irq_base, tmp >> 4, tmp & 0xf, omap_nr_irqs);

 	tmp = intc_readl(INTC_SYSCONFIG);
 	tmp |= 1 << 1;	/* soft reset */
 	intc_writel(INTC_SYSCONFIG, tmp);

 	while (!(intc_readl(INTC_SYSSTATUS) & 0x1))
 		/* Wait for reset to complete */;

 	/* Enable autoidle */
 	intc_writel(INTC_SYSCONFIG, 1 << 0);
 }

 int omap_irq_pending(void)
 {
 	int i;

 	for (i = 0; i < omap_nr_pending; i++)
 		if (intc_readl(INTC_PENDING_IRQ0 + (0x20 * i)))
 			return 1;
 	return 0;
 }

 void omap3_intc_suspend(void)
 {
 	/* A pending interrupt would prevent OMAP from entering suspend */
 	omap_ack_irq(NULL);
 }

 static int __init omap_alloc_gc_of(struct irq_domain *d, void __iomem *base)
 {
 	int ret;
 	int i;

 	ret = irq_alloc_domain_generic_chips(d, 32, 1, "INTC",
 			handle_level_irq, IRQ_NOREQUEST | IRQ_NOPROBE,
 			IRQ_LEVEL, 0);
 	if (ret) {
 		pr_warn("Failed to allocate irq chips\n");
 		return ret;
 	}

 	for (i = 0; i < omap_nr_pending; i++) {
 		struct irq_chip_generic *gc;
 		struct irq_chip_type *ct;

 		gc = irq_get_domain_generic_chip(d, 32 * i);
 		gc->reg_base = base;
 		ct = gc->chip_types;

 		ct->type = IRQ_TYPE_LEVEL_MASK;

 		ct->chip.irq_ack = omap_mask_ack_irq;
 		ct->chip.irq_mask = irq_gc_mask_disable_reg;
 		ct->chip.irq_unmask = irq_gc_unmask_enable_reg;

 		ct->chip.flags |= IRQCHIP_SKIP_SET_WAKE;

 		ct->regs.enable = INTC_MIR_CLEAR0 + 32 * i;
 		ct->regs.disable = INTC_MIR_SET0 + 32 * i;
 	}

 	return 0;
 }

 static void __init omap_alloc_gc_legacy(void __iomem *base,
 		unsigned int irq_start, unsigned int num)
 {
 	struct irq_chip_generic *gc;
 	struct irq_chip_type *ct;

 	gc = irq_alloc_generic_chip("INTC", 1, irq_start, base,
 			handle_level_irq);
 	ct = gc->chip_types;
 	ct->chip.irq_ack = omap_mask_ack_irq;
 	ct->chip.irq_mask = irq_gc_mask_disable_reg;
 	ct->chip.irq_unmask = irq_gc_unmask_enable_reg;
 	ct->chip.flags |= IRQCHIP_SKIP_SET_WAKE;

 	ct->regs.enable = INTC_MIR_CLEAR0;
 	ct->regs.disable = INTC_MIR_SET0;
 	irq_setup_generic_chip(gc, IRQ_MSK(num), IRQ_GC_INIT_MASK_CACHE,
 			IRQ_NOREQUEST | IRQ_NOPROBE, 0);
 }

 static int __init omap_init_irq_of(struct device_node *node)
 {
 	int ret;

 	omap_irq_base = of_iomap(node, 0);
 	if (WARN_ON(!omap_irq_base))
 		return -ENOMEM;

 	domain = irq_domain_add_linear(node, omap_nr_irqs,
 			&irq_generic_chip_ops, NULL);

 	omap_irq_soft_reset();

 	ret = omap_alloc_gc_of(domain, omap_irq_base);
 	if (ret < 0)
 		irq_domain_remove(domain);

 	return ret;
 }

 static int __init omap_init_irq_legacy(u32 base, struct device_node *node)
 {
 	int j, irq_base;

 	omap_irq_base = ioremap(base, SZ_4K);
 	if (WARN_ON(!omap_irq_base))
 		return -ENOMEM;

 	irq_base = irq_alloc_descs(-1, 0, omap_nr_irqs, 0);
 	if (irq_base < 0) {
 		pr_warn("Couldn't allocate IRQ numbers\n");
 		irq_base = 0;
 	}

 	domain = irq_domain_add_legacy(node, omap_nr_irqs, irq_base, 0,
 			&irq_domain_simple_ops, NULL);

 	omap_irq_soft_reset();

 	for (j = 0; j < omap_nr_irqs; j += 32)
 		omap_alloc_gc_legacy(omap_irq_base + j, j + irq_base, 32);

 	return 0;
 }

 static void __init omap_irq_enable_protection(void)
 {
 	u32 reg;

 	reg = intc_readl(INTC_PROTECTION);
 	reg |= INTC_PROTECTION_ENABLE;
 	intc_writel(INTC_PROTECTION, reg);
 }

 static int __init omap_init_irq(u32 base, struct device_node *node)
 {
 	int ret;

 	/*
 	 * FIXME legacy OMAP DMA driver sitting under arch/arm/plat-omap/dma.c
 	 * depends is still not ready for linear IRQ domains; because of that
 	 * we need to temporarily "blacklist" OMAP2 and OMAP3 devices from using
 	 * linear IRQ Domain until that driver is finally fixed.
 	 */
 	if (of_device_is_compatible(node, "ti,omap2-intc") ||
 			of_device_is_compatible(node, "ti,omap3-intc")) {
 		struct resource res;

 		if (of_address_to_resource(node, 0, &res))
 			return -ENOMEM;

 		base = res.start;
 		ret = omap_init_irq_legacy(base, node);
 	} else if (node) {
 		ret = omap_init_irq_of(node);
 	} else {
 		ret = omap_init_irq_legacy(base, NULL);
 	}

 	if (ret == 0)
 		omap_irq_enable_protection();

 	return ret;
 }

 static asmlinkage void __exception_irq_entry
 omap_intc_handle_irq(struct pt_regs *regs)
 {
 	extern unsigned long irq_err_count;
 	u32 irqnr;

 	irqnr = intc_readl(INTC_SIR);

 	/*
 	 * A spurious IRQ can result if interrupt that triggered the
 	 * sorting is no longer active during the sorting (10 INTC
 	 * functional clock cycles after interrupt assertion). Or a
 	 * change in interrupt mask affected the result during sorting
 	 * time. There is no special handling required except ignoring
 	 * the SIR register value just read and retrying.
 	 * See section 6.2.5 of AM335x TRM Literature Number: SPRUH73K
 	 *
 	 * Many a times, a spurious interrupt situation has been fixed
 	 * by adding a flush for the posted write acking the IRQ in
 	 * the device driver. Typically, this is going be the device
 	 * driver whose interrupt was handled just before the spurious
 	 * IRQ occurred. Pay attention to those device drivers if you
 	 * run into hitting the spurious IRQ condition below.
 	 */
 	if (unlikely((irqnr & SPURIOUSIRQ_MASK) == SPURIOUSIRQ_MASK)) {
 		pr_err_once("%s: spurious irq!\n", __func__);
 		irq_err_count++;
 		omap_ack_irq(NULL);
 		return;
 	}

 	irqnr &= ACTIVEIRQ_MASK;
 	handle_domain_irq(domain, irqnr, regs);
 }

 void __init omap3_init_irq(void)
 {
 	omap_nr_irqs = 96;
 	omap_nr_pending = 3;
 	omap_init_irq(OMAP34XX_IC_BASE, NULL);
 	set_handle_irq(omap_intc_handle_irq);
 }

 static int __init intc_of_init(struct device_node *node,
 			     struct device_node *parent)
 {
 	int ret;

 	omap_nr_pending = 3;
 	omap_nr_irqs = 96;

 	if (WARN_ON(!node))
 		return -ENODEV;

 	if (of_device_is_compatible(node, "ti,dm814-intc") ||
 	    of_device_is_compatible(node, "ti,dm816-intc") ||
 	    of_device_is_compatible(node, "ti,am33xx-intc")) {
 		omap_nr_irqs = 128;
 		omap_nr_pending = 4;
 	}

 	ret = omap_init_irq(-1, of_node_get(node));
 	if (ret < 0)
 		return ret;

 	set_handle_irq(omap_intc_handle_irq);

 	return 0;
 }

 IRQCHIP_DECLARE(omap2_intc, "ti,omap2-intc", intc_of_init);
 IRQCHIP_DECLARE(omap3_intc, "ti,omap3-intc", intc_of_init);
 IRQCHIP_DECLARE(dm814x_intc, "ti,dm814-intc", intc_of_init);
 IRQCHIP_DECLARE(dm816x_intc, "ti,dm816-intc", intc_of_init);
 IRQCHIP_DECLARE(am33xx_intc, "ti,am33xx-intc", intc_of_init);
	/*
	* linux/arch/arm/mach-omap2/irq.c
	*
	* Interrupt handler for OMAP2 boards.
	*
	* Copyright (C) 2005 Nokia Corporation
	* Author: Paul Mundt <paul.mundt@nokia.com>
	*
	* 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.
	*/
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/interrupt.h>
	#include <linux/io.h>

	#include <asm/exception.h>
	#include <linux/irqchip.h>
	#include <linux/irqdomain.h>
	#include <linux/of.h>
	#include <linux/of_address.h>
	#include <linux/of_irq.h>

	#include <linux/irqchip/irq-omap-intc.h>

	/* Define these here for now until we drop all board-files */
	#define OMAP24XX_IC_BASE 0x480fe000
	#define OMAP34XX_IC_BASE 0x48200000

	/* selected INTC register offsets */

	#define INTC_REVISION 0x0000
	#define INTC_SYSCONFIG 0x0010
	#define INTC_SYSSTATUS 0x0014
	#define INTC_SIR 0x0040
	#define INTC_CONTROL 0x0048
	#define INTC_PROTECTION 0x004C
	#define INTC_IDLE 0x0050
	#define INTC_THRESHOLD 0x0068
	#define INTC_MIR0 0x0084
	#define INTC_MIR_CLEAR0 0x0088
	#define INTC_MIR_SET0 0x008c
	#define INTC_PENDING_IRQ0 0x0098
	#define INTC_PENDING_IRQ1 0x00b8
	#define INTC_PENDING_IRQ2 0x00d8
	#define INTC_PENDING_IRQ3 0x00f8
	#define INTC_ILR0 0x0100

	#define ACTIVEIRQ_MASK 0x7f /* omap2/3 active interrupt bits */
	#define SPURIOUSIRQ_MASK (0x1ffffff << 7)
	#define INTCPS_NR_ILR_REGS 128
	#define INTCPS_NR_MIR_REGS 4

	#define INTC_IDLE_FUNCIDLE (1 << 0)
	#define INTC_IDLE_TURBO (1 << 1)

	#define INTC_PROTECTION_ENABLE (1 << 0)

	struct omap_intc_regs {
	u32 sysconfig;
	u32 protection;
	u32 idle;
	u32 threshold;
	u32 ilr[INTCPS_NR_ILR_REGS];
	u32 mir[INTCPS_NR_MIR_REGS];
	};
	static struct omap_intc_regs intc_context;

	static struct irq_domain *domain;
	static void __iomem *omap_irq_base;
	static int omap_nr_pending = 3;
	static int omap_nr_irqs = 96;

	static void intc_writel(u32 reg, u32 val)
	{
	writel_relaxed(val, omap_irq_base + reg);
	}

	static u32 intc_readl(u32 reg)
	{
	return readl_relaxed(omap_irq_base + reg);
	}

	void omap_intc_save_context(void)
	{
	int i;

	intc_context.sysconfig =
	intc_readl(INTC_SYSCONFIG);
	intc_context.protection =
	intc_readl(INTC_PROTECTION);
	intc_context.idle =
	intc_readl(INTC_IDLE);
	intc_context.threshold =
	intc_readl(INTC_THRESHOLD);

	for (i = 0; i < omap_nr_irqs; i++)
	intc_context.ilr[i] =
	intc_readl((INTC_ILR0 + 0x4 * i));
	for (i = 0; i < INTCPS_NR_MIR_REGS; i++)
	intc_context.mir[i] =
	intc_readl(INTC_MIR0 + (0x20 * i));
	}

	void omap_intc_restore_context(void)
	{
	int i;

	intc_writel(INTC_SYSCONFIG, intc_context.sysconfig);
	intc_writel(INTC_PROTECTION, intc_context.protection);
	intc_writel(INTC_IDLE, intc_context.idle);
	intc_writel(INTC_THRESHOLD, intc_context.threshold);

	for (i = 0; i < omap_nr_irqs; i++)
	intc_writel(INTC_ILR0 + 0x4 * i,
	intc_context.ilr[i]);

	for (i = 0; i < INTCPS_NR_MIR_REGS; i++)
	intc_writel(INTC_MIR0 + 0x20 * i,
	intc_context.mir[i]);
	/* MIRs are saved and restore with other PRCM registers */
	}

	void omap3_intc_prepare_idle(void)
	{
	/*
	* Disable autoidle as it can stall interrupt controller,
	* cf. errata ID i540 for 3430 (all revisions up to 3.1.x)
	*/
	intc_writel(INTC_SYSCONFIG, 0);
	intc_writel(INTC_IDLE, INTC_IDLE_TURBO);
	}

	void omap3_intc_resume_idle(void)
	{
	/* Re-enable autoidle */
	intc_writel(INTC_SYSCONFIG, 1);
	intc_writel(INTC_IDLE, 0);
	}

	/* XXX: FIQ and additional INTC support (only MPU at the moment) */
	static void omap_ack_irq(struct irq_data *d)
	{
	intc_writel(INTC_CONTROL, 0x1);
	}

	static void omap_mask_ack_irq(struct irq_data *d)
	{
	irq_gc_mask_disable_reg(d);
	omap_ack_irq(d);
	}

	static void __init omap_irq_soft_reset(void)
	{
	unsigned long tmp;

	tmp = intc_readl(INTC_REVISION) & 0xff;

	pr_info("IRQ: Found an INTC at 0x%p (revision %ld.%ld) with %d interrupts\n",
	omap_irq_base, tmp >> 4, tmp & 0xf, omap_nr_irqs);

	tmp = intc_readl(INTC_SYSCONFIG);
	tmp \|= 1 << 1; /* soft reset */
	intc_writel(INTC_SYSCONFIG, tmp);

	while (!(intc_readl(INTC_SYSSTATUS) & 0x1))
	/* Wait for reset to complete */;

	/* Enable autoidle */
	intc_writel(INTC_SYSCONFIG, 1 << 0);
	}

	int omap_irq_pending(void)
	{
	int i;

	for (i = 0; i < omap_nr_pending; i++)
	if (intc_readl(INTC_PENDING_IRQ0 + (0x20 * i)))
	return 1;
	return 0;
	}

	void omap3_intc_suspend(void)
	{
	/* A pending interrupt would prevent OMAP from entering suspend */
	omap_ack_irq(NULL);
	}

	static int __init omap_alloc_gc_of(struct irq_domain d, void __iomem base)
	{
	int ret;
	int i;

	ret = irq_alloc_domain_generic_chips(d, 32, 1, "INTC",
	handle_level_irq, IRQ_NOREQUEST \| IRQ_NOPROBE,
	IRQ_LEVEL, 0);
	if (ret) {
	pr_warn("Failed to allocate irq chips\n");
	return ret;
	}

	for (i = 0; i < omap_nr_pending; i++) {
	struct irq_chip_generic *gc;
	struct irq_chip_type *ct;

	gc = irq_get_domain_generic_chip(d, 32 * i);
	gc->reg_base = base;
	ct = gc->chip_types;

	ct->type = IRQ_TYPE_LEVEL_MASK;

	ct->chip.irq_ack = omap_mask_ack_irq;
	ct->chip.irq_mask = irq_gc_mask_disable_reg;
	ct->chip.irq_unmask = irq_gc_unmask_enable_reg;

	ct->chip.flags \|= IRQCHIP_SKIP_SET_WAKE;

	ct->regs.enable = INTC_MIR_CLEAR0 + 32 * i;
	ct->regs.disable = INTC_MIR_SET0 + 32 * i;
	}

	return 0;
	}

	static void __init omap_alloc_gc_legacy(void __iomem *base,
	unsigned int irq_start, unsigned int num)
	{
	struct irq_chip_generic *gc;
	struct irq_chip_type *ct;

	gc = irq_alloc_generic_chip("INTC", 1, irq_start, base,
	handle_level_irq);
	ct = gc->chip_types;
	ct->chip.irq_ack = omap_mask_ack_irq;
	ct->chip.irq_mask = irq_gc_mask_disable_reg;
	ct->chip.irq_unmask = irq_gc_unmask_enable_reg;
	ct->chip.flags \|= IRQCHIP_SKIP_SET_WAKE;

	ct->regs.enable = INTC_MIR_CLEAR0;
	ct->regs.disable = INTC_MIR_SET0;
	irq_setup_generic_chip(gc, IRQ_MSK(num), IRQ_GC_INIT_MASK_CACHE,
	IRQ_NOREQUEST \| IRQ_NOPROBE, 0);
	}

	static int __init omap_init_irq_of(struct device_node *node)
	{
	int ret;

	omap_irq_base = of_iomap(node, 0);
	if (WARN_ON(!omap_irq_base))
	return -ENOMEM;

	domain = irq_domain_add_linear(node, omap_nr_irqs,
	&irq_generic_chip_ops, NULL);

	omap_irq_soft_reset();

	ret = omap_alloc_gc_of(domain, omap_irq_base);
	if (ret < 0)
	irq_domain_remove(domain);

	return ret;
	}

	static int __init omap_init_irq_legacy(u32 base, struct device_node *node)
	{
	int j, irq_base;

	omap_irq_base = ioremap(base, SZ_4K);
	if (WARN_ON(!omap_irq_base))
	return -ENOMEM;

	irq_base = irq_alloc_descs(-1, 0, omap_nr_irqs, 0);
	if (irq_base < 0) {
	pr_warn("Couldn't allocate IRQ numbers\n");
	irq_base = 0;
	}

	domain = irq_domain_add_legacy(node, omap_nr_irqs, irq_base, 0,
	&irq_domain_simple_ops, NULL);

	omap_irq_soft_reset();

	for (j = 0; j < omap_nr_irqs; j += 32)
	omap_alloc_gc_legacy(omap_irq_base + j, j + irq_base, 32);

	return 0;
	}

	static void __init omap_irq_enable_protection(void)
	{
	u32 reg;

	reg = intc_readl(INTC_PROTECTION);
	reg \|= INTC_PROTECTION_ENABLE;
	intc_writel(INTC_PROTECTION, reg);
	}

	static int __init omap_init_irq(u32 base, struct device_node *node)
	{
	int ret;

	/*
	* FIXME legacy OMAP DMA driver sitting under arch/arm/plat-omap/dma.c
	* depends is still not ready for linear IRQ domains; because of that
	* we need to temporarily "blacklist" OMAP2 and OMAP3 devices from using
	* linear IRQ Domain until that driver is finally fixed.
	*/
	if (of_device_is_compatible(node, "ti,omap2-intc") \|\|
	of_device_is_compatible(node, "ti,omap3-intc")) {
	struct resource res;

	if (of_address_to_resource(node, 0, &res))
	return -ENOMEM;

	base = res.start;
	ret = omap_init_irq_legacy(base, node);
	} else if (node) {
	ret = omap_init_irq_of(node);
	} else {
	ret = omap_init_irq_legacy(base, NULL);
	}

	if (ret == 0)
	omap_irq_enable_protection();

	return ret;
	}

	static asmlinkage void __exception_irq_entry
	omap_intc_handle_irq(struct pt_regs *regs)
	{
	extern unsigned long irq_err_count;
	u32 irqnr;

	irqnr = intc_readl(INTC_SIR);

	/*
	* A spurious IRQ can result if interrupt that triggered the
	* sorting is no longer active during the sorting (10 INTC
	* functional clock cycles after interrupt assertion). Or a
	* change in interrupt mask affected the result during sorting
	* time. There is no special handling required except ignoring
	* the SIR register value just read and retrying.
	* See section 6.2.5 of AM335x TRM Literature Number: SPRUH73K
	*
	* Many a times, a spurious interrupt situation has been fixed
	* by adding a flush for the posted write acking the IRQ in
	* the device driver. Typically, this is going be the device
	* driver whose interrupt was handled just before the spurious
	* IRQ occurred. Pay attention to those device drivers if you
	* run into hitting the spurious IRQ condition below.
	*/
	if (unlikely((irqnr & SPURIOUSIRQ_MASK) == SPURIOUSIRQ_MASK)) {
	pr_err_once("%s: spurious irq!\n", __func__);
	irq_err_count++;
	omap_ack_irq(NULL);
	return;
	}

	irqnr &= ACTIVEIRQ_MASK;
	handle_domain_irq(domain, irqnr, regs);
	}

	void __init omap3_init_irq(void)
	{
	omap_nr_irqs = 96;
	omap_nr_pending = 3;
	omap_init_irq(OMAP34XX_IC_BASE, NULL);
	set_handle_irq(omap_intc_handle_irq);
	}

	static int __init intc_of_init(struct device_node *node,
	struct device_node *parent)
	{
	int ret;

	omap_nr_pending = 3;
	omap_nr_irqs = 96;

	if (WARN_ON(!node))
	return -ENODEV;

	if (of_device_is_compatible(node, "ti,dm814-intc") \|\|
	of_device_is_compatible(node, "ti,dm816-intc") \|\|
	of_device_is_compatible(node, "ti,am33xx-intc")) {
	omap_nr_irqs = 128;
	omap_nr_pending = 4;
	}

	ret = omap_init_irq(-1, of_node_get(node));
	if (ret < 0)
	return ret;

	set_handle_irq(omap_intc_handle_irq);

	return 0;
	}

	IRQCHIP_DECLARE(omap2_intc, "ti,omap2-intc", intc_of_init);
	IRQCHIP_DECLARE(omap3_intc, "ti,omap3-intc", intc_of_init);
	IRQCHIP_DECLARE(dm814x_intc, "ti,dm814-intc", intc_of_init);
	IRQCHIP_DECLARE(dm816x_intc, "ti,dm816-intc", intc_of_init);
	IRQCHIP_DECLARE(am33xx_intc, "ti,am33xx-intc", intc_of_init);