arch/mips/emma/markeins/irq.c - arm/linux - Git at Google

 /*
  *  Copyright (C) NEC Electronics Corporation 2004-2006
  *
  *  This file is based on the arch/mips/ddb5xxx/ddb5477/irq.c
  *
  *	Copyright 2001 MontaVista Software Inc.
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
  *  the Free Software Foundation; either version 2 of the License, or
  *  (at your option) any later version.
  *
  *  This program is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *  GNU General Public License for more details.
  *
  *  You should have received a copy of the GNU General Public License
  *  along with this program; if not, write to the Free Software
  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <linux/types.h>
 #include <linux/ptrace.h>
 #include <linux/delay.h>

 #include <asm/irq_cpu.h>
 #include <asm/mipsregs.h>
 #include <asm/addrspace.h>
 #include <asm/bootinfo.h>

 #include <asm/emma/emma2rh.h>

 static void emma2rh_irq_enable(struct irq_data *d)
 {
 	unsigned int irq = d->irq - EMMA2RH_IRQ_BASE;
 	u32 reg_value, reg_bitmask, reg_index;

 	reg_index = EMMA2RH_BHIF_INT_EN_0 +
 		    (EMMA2RH_BHIF_INT_EN_1 - EMMA2RH_BHIF_INT_EN_0) * (irq / 32);
 	reg_value = emma2rh_in32(reg_index);
 	reg_bitmask = 0x1 << (irq % 32);
 	emma2rh_out32(reg_index, reg_value | reg_bitmask);
 }

 static void emma2rh_irq_disable(struct irq_data *d)
 {
 	unsigned int irq = d->irq - EMMA2RH_IRQ_BASE;
 	u32 reg_value, reg_bitmask, reg_index;

 	reg_index = EMMA2RH_BHIF_INT_EN_0 +
 		    (EMMA2RH_BHIF_INT_EN_1 - EMMA2RH_BHIF_INT_EN_0) * (irq / 32);
 	reg_value = emma2rh_in32(reg_index);
 	reg_bitmask = 0x1 << (irq % 32);
 	emma2rh_out32(reg_index, reg_value & ~reg_bitmask);
 }

 struct irq_chip emma2rh_irq_controller = {
 	.name = "emma2rh_irq",
 	.irq_mask = emma2rh_irq_disable,
 	.irq_unmask = emma2rh_irq_enable,
 };

 void emma2rh_irq_init(void)
 {
 	u32 i;

 	for (i = 0; i < NUM_EMMA2RH_IRQ; i++)
 		irq_set_chip_and_handler_name(EMMA2RH_IRQ_BASE + i,
 					      &emma2rh_irq_controller,
 					      handle_level_irq, "level");
 }

 static void emma2rh_sw_irq_enable(struct irq_data *d)
 {
 	unsigned int irq = d->irq - EMMA2RH_SW_IRQ_BASE;
 	u32 reg;

 	reg = emma2rh_in32(EMMA2RH_BHIF_SW_INT_EN);
 	reg |= 1 << irq;
 	emma2rh_out32(EMMA2RH_BHIF_SW_INT_EN, reg);
 }

 static void emma2rh_sw_irq_disable(struct irq_data *d)
 {
 	unsigned int irq = d->irq - EMMA2RH_SW_IRQ_BASE;
 	u32 reg;

 	reg = emma2rh_in32(EMMA2RH_BHIF_SW_INT_EN);
 	reg &= ~(1 << irq);
 	emma2rh_out32(EMMA2RH_BHIF_SW_INT_EN, reg);
 }

 struct irq_chip emma2rh_sw_irq_controller = {
 	.name = "emma2rh_sw_irq",
 	.irq_mask = emma2rh_sw_irq_disable,
 	.irq_unmask = emma2rh_sw_irq_enable,
 };

 void emma2rh_sw_irq_init(void)
 {
 	u32 i;

 	for (i = 0; i < NUM_EMMA2RH_IRQ_SW; i++)
 		irq_set_chip_and_handler_name(EMMA2RH_SW_IRQ_BASE + i,
 					      &emma2rh_sw_irq_controller,
 					      handle_level_irq, "level");
 }

 static void emma2rh_gpio_irq_enable(struct irq_data *d)
 {
 	unsigned int irq = d->irq - EMMA2RH_GPIO_IRQ_BASE;
 	u32 reg;

 	reg = emma2rh_in32(EMMA2RH_GPIO_INT_MASK);
 	reg |= 1 << irq;
 	emma2rh_out32(EMMA2RH_GPIO_INT_MASK, reg);
 }

 static void emma2rh_gpio_irq_disable(struct irq_data *d)
 {
 	unsigned int irq = d->irq - EMMA2RH_GPIO_IRQ_BASE;
 	u32 reg;

 	reg = emma2rh_in32(EMMA2RH_GPIO_INT_MASK);
 	reg &= ~(1 << irq);
 	emma2rh_out32(EMMA2RH_GPIO_INT_MASK, reg);
 }

 static void emma2rh_gpio_irq_ack(struct irq_data *d)
 {
 	unsigned int irq = d->irq - EMMA2RH_GPIO_IRQ_BASE;

 	emma2rh_out32(EMMA2RH_GPIO_INT_ST, ~(1 << irq));
 }

 static void emma2rh_gpio_irq_mask_ack(struct irq_data *d)
 {
 	unsigned int irq = d->irq - EMMA2RH_GPIO_IRQ_BASE;
 	u32 reg;

 	emma2rh_out32(EMMA2RH_GPIO_INT_ST, ~(1 << irq));

 	reg = emma2rh_in32(EMMA2RH_GPIO_INT_MASK);
 	reg &= ~(1 << irq);
 	emma2rh_out32(EMMA2RH_GPIO_INT_MASK, reg);
 }

 struct irq_chip emma2rh_gpio_irq_controller = {
 	.name = "emma2rh_gpio_irq",
 	.irq_ack = emma2rh_gpio_irq_ack,
 	.irq_mask = emma2rh_gpio_irq_disable,
 	.irq_mask_ack = emma2rh_gpio_irq_mask_ack,
 	.irq_unmask = emma2rh_gpio_irq_enable,
 };

 void emma2rh_gpio_irq_init(void)
 {
 	u32 i;

 	for (i = 0; i < NUM_EMMA2RH_IRQ_GPIO; i++)
 		irq_set_chip_and_handler_name(EMMA2RH_GPIO_IRQ_BASE + i,
 					      &emma2rh_gpio_irq_controller,
 					      handle_edge_irq, "edge");
 }

 static struct irqaction irq_cascade = {
 	   .handler = no_action,
 	   .flags = IRQF_NO_THREAD,
 	   .name = "cascade",
 	   .dev_id = NULL,
 	   .next = NULL,
 };

 /*
  * the first level int-handler will jump here if it is a emma2rh irq
  */
 void emma2rh_irq_dispatch(void)
 {
 	u32 intStatus;
 	u32 bitmask;
 	u32 i;

 	intStatus = emma2rh_in32(EMMA2RH_BHIF_INT_ST_0) &
 		    emma2rh_in32(EMMA2RH_BHIF_INT_EN_0);

 #ifdef EMMA2RH_SW_CASCADE
 	if (intStatus & (1UL << EMMA2RH_SW_CASCADE)) {
 		u32 swIntStatus;
 		swIntStatus = emma2rh_in32(EMMA2RH_BHIF_SW_INT)
 		    & emma2rh_in32(EMMA2RH_BHIF_SW_INT_EN);
 		for (i = 0, bitmask = 1; i < 32; i++, bitmask <<= 1) {
 			if (swIntStatus & bitmask) {
 				do_IRQ(EMMA2RH_SW_IRQ_BASE + i);
 				return;
 			}
 		}
 	}
 	/* Skip S/W interrupt */
 	intStatus &= ~(1UL << EMMA2RH_SW_CASCADE);
 #endif

 	for (i = 0, bitmask = 1; i < 32; i++, bitmask <<= 1) {
 		if (intStatus & bitmask) {
 			do_IRQ(EMMA2RH_IRQ_BASE + i);
 			return;
 		}
 	}

 	intStatus = emma2rh_in32(EMMA2RH_BHIF_INT_ST_1) &
 		    emma2rh_in32(EMMA2RH_BHIF_INT_EN_1);

 #ifdef EMMA2RH_GPIO_CASCADE
 	if (intStatus & (1UL << (EMMA2RH_GPIO_CASCADE % 32))) {
 		u32 gpioIntStatus;
 		gpioIntStatus = emma2rh_in32(EMMA2RH_GPIO_INT_ST)
 		    & emma2rh_in32(EMMA2RH_GPIO_INT_MASK);
 		for (i = 0, bitmask = 1; i < 32; i++, bitmask <<= 1) {
 			if (gpioIntStatus & bitmask) {
 				do_IRQ(EMMA2RH_GPIO_IRQ_BASE + i);
 				return;
 			}
 		}
 	}
 	/* Skip GPIO interrupt */
 	intStatus &= ~(1UL << (EMMA2RH_GPIO_CASCADE % 32));
 #endif

 	for (i = 32, bitmask = 1; i < 64; i++, bitmask <<= 1) {
 		if (intStatus & bitmask) {
 			do_IRQ(EMMA2RH_IRQ_BASE + i);
 			return;
 		}
 	}

 	intStatus = emma2rh_in32(EMMA2RH_BHIF_INT_ST_2) &
 		    emma2rh_in32(EMMA2RH_BHIF_INT_EN_2);

 	for (i = 64, bitmask = 1; i < 96; i++, bitmask <<= 1) {
 		if (intStatus & bitmask) {
 			do_IRQ(EMMA2RH_IRQ_BASE + i);
 			return;
 		}
 	}
 }

 void __init arch_init_irq(void)
 {
 	u32 reg;

 	/* by default, interrupts are disabled. */
 	emma2rh_out32(EMMA2RH_BHIF_INT_EN_0, 0);
 	emma2rh_out32(EMMA2RH_BHIF_INT_EN_1, 0);
 	emma2rh_out32(EMMA2RH_BHIF_INT_EN_2, 0);
 	emma2rh_out32(EMMA2RH_BHIF_INT1_EN_0, 0);
 	emma2rh_out32(EMMA2RH_BHIF_INT1_EN_1, 0);
 	emma2rh_out32(EMMA2RH_BHIF_INT1_EN_2, 0);
 	emma2rh_out32(EMMA2RH_BHIF_SW_INT_EN, 0);

 	clear_c0_status(0xff00);
 	set_c0_status(0x0400);

 #define GPIO_PCI (0xf<<15)
 	/* setup GPIO interrupt for PCI interface */
 	/* direction input */
 	reg = emma2rh_in32(EMMA2RH_GPIO_DIR);
 	emma2rh_out32(EMMA2RH_GPIO_DIR, reg & ~GPIO_PCI);
 	/* disable interrupt */
 	reg = emma2rh_in32(EMMA2RH_GPIO_INT_MASK);
 	emma2rh_out32(EMMA2RH_GPIO_INT_MASK, reg & ~GPIO_PCI);
 	/* level triggerd */
 	reg = emma2rh_in32(EMMA2RH_GPIO_INT_MODE);
 	emma2rh_out32(EMMA2RH_GPIO_INT_MODE, reg | GPIO_PCI);
 	reg = emma2rh_in32(EMMA2RH_GPIO_INT_CND_A);
 	emma2rh_out32(EMMA2RH_GPIO_INT_CND_A, reg & (~GPIO_PCI));
 	/* interrupt clear */
 	emma2rh_out32(EMMA2RH_GPIO_INT_ST, ~GPIO_PCI);

 	/* init all controllers */
 	emma2rh_irq_init();
 	emma2rh_sw_irq_init();
 	emma2rh_gpio_irq_init();
 	mips_cpu_irq_init();

 	/* setup cascade interrupts */
 	setup_irq(EMMA2RH_IRQ_BASE + EMMA2RH_SW_CASCADE, &irq_cascade);
 	setup_irq(EMMA2RH_IRQ_BASE + EMMA2RH_GPIO_CASCADE, &irq_cascade);
 	setup_irq(MIPS_CPU_IRQ_BASE + 2, &irq_cascade);
 }

 asmlinkage void plat_irq_dispatch(void)
 {
 	unsigned int pending = read_c0_status() & read_c0_cause() & ST0_IM;

 	if (pending & STATUSF_IP7)
 		do_IRQ(MIPS_CPU_IRQ_BASE + 7);
 	else if (pending & STATUSF_IP2)
 		emma2rh_irq_dispatch();
 	else if (pending & STATUSF_IP1)
 		do_IRQ(MIPS_CPU_IRQ_BASE + 1);
 	else if (pending & STATUSF_IP0)
 		do_IRQ(MIPS_CPU_IRQ_BASE + 0);
 	else
 		spurious_interrupt();
 }
	/*
	* Copyright (C) NEC Electronics Corporation 2004-2006
	*
	* This file is based on the arch/mips/ddb5xxx/ddb5477/irq.c
	*
	* Copyright 2001 MontaVista Software Inc.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	*/
	#include <linux/init.h>
	#include <linux/interrupt.h>
	#include <linux/irq.h>
	#include <linux/types.h>
	#include <linux/ptrace.h>
	#include <linux/delay.h>

	#include <asm/irq_cpu.h>
	#include <asm/mipsregs.h>
	#include <asm/addrspace.h>
	#include <asm/bootinfo.h>

	#include <asm/emma/emma2rh.h>

	static void emma2rh_irq_enable(struct irq_data *d)
	{
	unsigned int irq = d->irq - EMMA2RH_IRQ_BASE;
	u32 reg_value, reg_bitmask, reg_index;

	reg_index = EMMA2RH_BHIF_INT_EN_0 +
	(EMMA2RH_BHIF_INT_EN_1 - EMMA2RH_BHIF_INT_EN_0) * (irq / 32);
	reg_value = emma2rh_in32(reg_index);
	reg_bitmask = 0x1 << (irq % 32);
	emma2rh_out32(reg_index, reg_value \| reg_bitmask);
	}

	static void emma2rh_irq_disable(struct irq_data *d)
	{
	unsigned int irq = d->irq - EMMA2RH_IRQ_BASE;
	u32 reg_value, reg_bitmask, reg_index;

	reg_index = EMMA2RH_BHIF_INT_EN_0 +
	(EMMA2RH_BHIF_INT_EN_1 - EMMA2RH_BHIF_INT_EN_0) * (irq / 32);
	reg_value = emma2rh_in32(reg_index);
	reg_bitmask = 0x1 << (irq % 32);
	emma2rh_out32(reg_index, reg_value & ~reg_bitmask);
	}

	struct irq_chip emma2rh_irq_controller = {
	.name = "emma2rh_irq",
	.irq_mask = emma2rh_irq_disable,
	.irq_unmask = emma2rh_irq_enable,
	};

	void emma2rh_irq_init(void)
	{
	u32 i;

	for (i = 0; i < NUM_EMMA2RH_IRQ; i++)
	irq_set_chip_and_handler_name(EMMA2RH_IRQ_BASE + i,
	&emma2rh_irq_controller,
	handle_level_irq, "level");
	}

	static void emma2rh_sw_irq_enable(struct irq_data *d)
	{
	unsigned int irq = d->irq - EMMA2RH_SW_IRQ_BASE;
	u32 reg;

	reg = emma2rh_in32(EMMA2RH_BHIF_SW_INT_EN);
	reg \|= 1 << irq;
	emma2rh_out32(EMMA2RH_BHIF_SW_INT_EN, reg);
	}

	static void emma2rh_sw_irq_disable(struct irq_data *d)
	{
	unsigned int irq = d->irq - EMMA2RH_SW_IRQ_BASE;
	u32 reg;

	reg = emma2rh_in32(EMMA2RH_BHIF_SW_INT_EN);
	reg &= ~(1 << irq);
	emma2rh_out32(EMMA2RH_BHIF_SW_INT_EN, reg);
	}

	struct irq_chip emma2rh_sw_irq_controller = {
	.name = "emma2rh_sw_irq",
	.irq_mask = emma2rh_sw_irq_disable,
	.irq_unmask = emma2rh_sw_irq_enable,
	};

	void emma2rh_sw_irq_init(void)
	{
	u32 i;

	for (i = 0; i < NUM_EMMA2RH_IRQ_SW; i++)
	irq_set_chip_and_handler_name(EMMA2RH_SW_IRQ_BASE + i,
	&emma2rh_sw_irq_controller,
	handle_level_irq, "level");
	}

	static void emma2rh_gpio_irq_enable(struct irq_data *d)
	{
	unsigned int irq = d->irq - EMMA2RH_GPIO_IRQ_BASE;
	u32 reg;

	reg = emma2rh_in32(EMMA2RH_GPIO_INT_MASK);
	reg \|= 1 << irq;
	emma2rh_out32(EMMA2RH_GPIO_INT_MASK, reg);
	}

	static void emma2rh_gpio_irq_disable(struct irq_data *d)
	{
	unsigned int irq = d->irq - EMMA2RH_GPIO_IRQ_BASE;
	u32 reg;

	reg = emma2rh_in32(EMMA2RH_GPIO_INT_MASK);
	reg &= ~(1 << irq);
	emma2rh_out32(EMMA2RH_GPIO_INT_MASK, reg);
	}

	static void emma2rh_gpio_irq_ack(struct irq_data *d)
	{
	unsigned int irq = d->irq - EMMA2RH_GPIO_IRQ_BASE;

	emma2rh_out32(EMMA2RH_GPIO_INT_ST, ~(1 << irq));
	}

	static void emma2rh_gpio_irq_mask_ack(struct irq_data *d)
	{
	unsigned int irq = d->irq - EMMA2RH_GPIO_IRQ_BASE;
	u32 reg;

	emma2rh_out32(EMMA2RH_GPIO_INT_ST, ~(1 << irq));

	reg = emma2rh_in32(EMMA2RH_GPIO_INT_MASK);
	reg &= ~(1 << irq);
	emma2rh_out32(EMMA2RH_GPIO_INT_MASK, reg);
	}

	struct irq_chip emma2rh_gpio_irq_controller = {
	.name = "emma2rh_gpio_irq",
	.irq_ack = emma2rh_gpio_irq_ack,
	.irq_mask = emma2rh_gpio_irq_disable,
	.irq_mask_ack = emma2rh_gpio_irq_mask_ack,
	.irq_unmask = emma2rh_gpio_irq_enable,
	};

	void emma2rh_gpio_irq_init(void)
	{
	u32 i;

	for (i = 0; i < NUM_EMMA2RH_IRQ_GPIO; i++)
	irq_set_chip_and_handler_name(EMMA2RH_GPIO_IRQ_BASE + i,
	&emma2rh_gpio_irq_controller,
	handle_edge_irq, "edge");
	}

	static struct irqaction irq_cascade = {
	.handler = no_action,
	.flags = IRQF_NO_THREAD,
	.name = "cascade",
	.dev_id = NULL,
	.next = NULL,
	};

	/*
	* the first level int-handler will jump here if it is a emma2rh irq
	*/
	void emma2rh_irq_dispatch(void)
	{
	u32 intStatus;
	u32 bitmask;
	u32 i;

	intStatus = emma2rh_in32(EMMA2RH_BHIF_INT_ST_0) &
	emma2rh_in32(EMMA2RH_BHIF_INT_EN_0);

	#ifdef EMMA2RH_SW_CASCADE
	if (intStatus & (1UL << EMMA2RH_SW_CASCADE)) {
	u32 swIntStatus;
	swIntStatus = emma2rh_in32(EMMA2RH_BHIF_SW_INT)
	& emma2rh_in32(EMMA2RH_BHIF_SW_INT_EN);
	for (i = 0, bitmask = 1; i < 32; i++, bitmask <<= 1) {
	if (swIntStatus & bitmask) {
	do_IRQ(EMMA2RH_SW_IRQ_BASE + i);
	return;
	}
	}
	}
	/* Skip S/W interrupt */
	intStatus &= ~(1UL << EMMA2RH_SW_CASCADE);
	#endif

	for (i = 0, bitmask = 1; i < 32; i++, bitmask <<= 1) {
	if (intStatus & bitmask) {
	do_IRQ(EMMA2RH_IRQ_BASE + i);
	return;
	}
	}

	intStatus = emma2rh_in32(EMMA2RH_BHIF_INT_ST_1) &
	emma2rh_in32(EMMA2RH_BHIF_INT_EN_1);

	#ifdef EMMA2RH_GPIO_CASCADE
	if (intStatus & (1UL << (EMMA2RH_GPIO_CASCADE % 32))) {
	u32 gpioIntStatus;
	gpioIntStatus = emma2rh_in32(EMMA2RH_GPIO_INT_ST)
	& emma2rh_in32(EMMA2RH_GPIO_INT_MASK);
	for (i = 0, bitmask = 1; i < 32; i++, bitmask <<= 1) {
	if (gpioIntStatus & bitmask) {
	do_IRQ(EMMA2RH_GPIO_IRQ_BASE + i);
	return;
	}
	}
	}
	/* Skip GPIO interrupt */
	intStatus &= ~(1UL << (EMMA2RH_GPIO_CASCADE % 32));
	#endif

	for (i = 32, bitmask = 1; i < 64; i++, bitmask <<= 1) {
	if (intStatus & bitmask) {
	do_IRQ(EMMA2RH_IRQ_BASE + i);
	return;
	}
	}

	intStatus = emma2rh_in32(EMMA2RH_BHIF_INT_ST_2) &
	emma2rh_in32(EMMA2RH_BHIF_INT_EN_2);

	for (i = 64, bitmask = 1; i < 96; i++, bitmask <<= 1) {
	if (intStatus & bitmask) {
	do_IRQ(EMMA2RH_IRQ_BASE + i);
	return;
	}
	}
	}

	void __init arch_init_irq(void)
	{
	u32 reg;

	/* by default, interrupts are disabled. */
	emma2rh_out32(EMMA2RH_BHIF_INT_EN_0, 0);
	emma2rh_out32(EMMA2RH_BHIF_INT_EN_1, 0);
	emma2rh_out32(EMMA2RH_BHIF_INT_EN_2, 0);
	emma2rh_out32(EMMA2RH_BHIF_INT1_EN_0, 0);
	emma2rh_out32(EMMA2RH_BHIF_INT1_EN_1, 0);
	emma2rh_out32(EMMA2RH_BHIF_INT1_EN_2, 0);
	emma2rh_out32(EMMA2RH_BHIF_SW_INT_EN, 0);

	clear_c0_status(0xff00);
	set_c0_status(0x0400);

	#define GPIO_PCI (0xf<<15)
	/* setup GPIO interrupt for PCI interface */
	/* direction input */
	reg = emma2rh_in32(EMMA2RH_GPIO_DIR);
	emma2rh_out32(EMMA2RH_GPIO_DIR, reg & ~GPIO_PCI);
	/* disable interrupt */
	reg = emma2rh_in32(EMMA2RH_GPIO_INT_MASK);
	emma2rh_out32(EMMA2RH_GPIO_INT_MASK, reg & ~GPIO_PCI);
	/* level triggerd */
	reg = emma2rh_in32(EMMA2RH_GPIO_INT_MODE);
	emma2rh_out32(EMMA2RH_GPIO_INT_MODE, reg \| GPIO_PCI);
	reg = emma2rh_in32(EMMA2RH_GPIO_INT_CND_A);
	emma2rh_out32(EMMA2RH_GPIO_INT_CND_A, reg & (~GPIO_PCI));
	/* interrupt clear */
	emma2rh_out32(EMMA2RH_GPIO_INT_ST, ~GPIO_PCI);

	/* init all controllers */
	emma2rh_irq_init();
	emma2rh_sw_irq_init();
	emma2rh_gpio_irq_init();
	mips_cpu_irq_init();

	/* setup cascade interrupts */
	setup_irq(EMMA2RH_IRQ_BASE + EMMA2RH_SW_CASCADE, &irq_cascade);
	setup_irq(EMMA2RH_IRQ_BASE + EMMA2RH_GPIO_CASCADE, &irq_cascade);
	setup_irq(MIPS_CPU_IRQ_BASE + 2, &irq_cascade);
	}

	asmlinkage void plat_irq_dispatch(void)
	{
	unsigned int pending = read_c0_status() & read_c0_cause() & ST0_IM;

	if (pending & STATUSF_IP7)
	do_IRQ(MIPS_CPU_IRQ_BASE + 7);
	else if (pending & STATUSF_IP2)
	emma2rh_irq_dispatch();
	else if (pending & STATUSF_IP1)
	do_IRQ(MIPS_CPU_IRQ_BASE + 1);
	else if (pending & STATUSF_IP0)
	do_IRQ(MIPS_CPU_IRQ_BASE + 0);
	else
	spurious_interrupt();
	}