arch/mips/ath79/irq.c - kernel/bruno - Git at Google

 /*
  *  Atheros AR71xx/AR724x/AR913x specific interrupt handling
  *
  *  Copyright (C) 2010-2011 Jaiganesh Narayanan <jnarayanan@atheros.com>
  *  Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org>
  *  Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
  *
  *  Parts of this file are based on Atheros' 2.6.15/2.6.31 BSP
  *
  *  This program is free software; you can redistribute it and/or modify it
  *  under the terms of the GNU General Public License version 2 as published
  *  by the Free Software Foundation.
  */

 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/irqchip.h>
 #include <linux/of_irq.h>

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

 #include <asm/mach-ath79/ath79.h>
 #include <asm/mach-ath79/ar71xx_regs.h>
 #include "common.h"
 #include "machtypes.h"

 static void ath79_misc_irq_handler(struct irq_desc *desc)
 {
 	void __iomem *base = ath79_reset_base;
 	u32 pending;

 	pending = __raw_readl(base + AR71XX_RESET_REG_MISC_INT_STATUS) &
 		  __raw_readl(base + AR71XX_RESET_REG_MISC_INT_ENABLE);

 	if (!pending) {
 		spurious_interrupt();
 		return;
 	}

 	while (pending) {
 		int bit = __ffs(pending);

 		generic_handle_irq(ATH79_MISC_IRQ(bit));
 		pending &= ~BIT(bit);
 	}
 }

 static void ar71xx_misc_irq_unmask(struct irq_data *d)
 {
 	unsigned int irq = d->irq - ATH79_MISC_IRQ_BASE;
 	void __iomem *base = ath79_reset_base;
 	u32 t;

 	t = __raw_readl(base + AR71XX_RESET_REG_MISC_INT_ENABLE);
 	__raw_writel(t | (1 << irq), base + AR71XX_RESET_REG_MISC_INT_ENABLE);

 	/* flush write */
 	__raw_readl(base + AR71XX_RESET_REG_MISC_INT_ENABLE);
 }

 static void ar71xx_misc_irq_mask(struct irq_data *d)
 {
 	unsigned int irq = d->irq - ATH79_MISC_IRQ_BASE;
 	void __iomem *base = ath79_reset_base;
 	u32 t;

 	t = __raw_readl(base + AR71XX_RESET_REG_MISC_INT_ENABLE);
 	__raw_writel(t & ~(1 << irq), base + AR71XX_RESET_REG_MISC_INT_ENABLE);

 	/* flush write */
 	__raw_readl(base + AR71XX_RESET_REG_MISC_INT_ENABLE);
 }

 static void ar724x_misc_irq_ack(struct irq_data *d)
 {
 	unsigned int irq = d->irq - ATH79_MISC_IRQ_BASE;
 	void __iomem *base = ath79_reset_base;
 	u32 t;

 	t = __raw_readl(base + AR71XX_RESET_REG_MISC_INT_STATUS);
 	__raw_writel(t & ~(1 << irq), base + AR71XX_RESET_REG_MISC_INT_STATUS);

 	/* flush write */
 	__raw_readl(base + AR71XX_RESET_REG_MISC_INT_STATUS);
 }

 static struct irq_chip ath79_misc_irq_chip = {
 	.name		= "MISC",
 	.irq_unmask	= ar71xx_misc_irq_unmask,
 	.irq_mask	= ar71xx_misc_irq_mask,
 };

 static void __init ath79_misc_irq_init(void)
 {
 	void __iomem *base = ath79_reset_base;
 	int i;

 	__raw_writel(0, base + AR71XX_RESET_REG_MISC_INT_ENABLE);
 	__raw_writel(0, base + AR71XX_RESET_REG_MISC_INT_STATUS);

 	if (soc_is_ar71xx() || soc_is_ar913x())
 		ath79_misc_irq_chip.irq_mask_ack = ar71xx_misc_irq_mask;
 	else if (soc_is_ar724x() ||
 		 soc_is_ar933x() ||
 		 soc_is_ar934x() ||
 		 soc_is_qca955x())
 		ath79_misc_irq_chip.irq_ack = ar724x_misc_irq_ack;
 	else
 		BUG();

 	for (i = ATH79_MISC_IRQ_BASE;
 	     i < ATH79_MISC_IRQ_BASE + ATH79_MISC_IRQ_COUNT; i++) {
 		irq_set_chip_and_handler(i, &ath79_misc_irq_chip,
 					 handle_level_irq);
 	}

 	irq_set_chained_handler(ATH79_CPU_IRQ(6), ath79_misc_irq_handler);
 }

 static void ar934x_ip2_irq_dispatch(struct irq_desc *desc)
 {
 	u32 status;

 	status = ath79_reset_rr(AR934X_RESET_REG_PCIE_WMAC_INT_STATUS);

 	if (status & AR934X_PCIE_WMAC_INT_PCIE_ALL) {
 		ath79_ddr_wb_flush(3);
 		generic_handle_irq(ATH79_IP2_IRQ(0));
 	} else if (status & AR934X_PCIE_WMAC_INT_WMAC_ALL) {
 		ath79_ddr_wb_flush(4);
 		generic_handle_irq(ATH79_IP2_IRQ(1));
 	} else {
 		spurious_interrupt();
 	}
 }

 static void ar934x_ip2_irq_init(void)
 {
 	int i;

 	for (i = ATH79_IP2_IRQ_BASE;
 	     i < ATH79_IP2_IRQ_BASE + ATH79_IP2_IRQ_COUNT; i++)
 		irq_set_chip_and_handler(i, &dummy_irq_chip,
 					 handle_level_irq);

 	irq_set_chained_handler(ATH79_CPU_IRQ(2), ar934x_ip2_irq_dispatch);
 }

 static void qca955x_ip2_irq_dispatch(struct irq_desc *desc)
 {
 	u32 status;

 	status = ath79_reset_rr(QCA955X_RESET_REG_EXT_INT_STATUS);
 	status &= QCA955X_EXT_INT_PCIE_RC1_ALL | QCA955X_EXT_INT_WMAC_ALL;

 	if (status == 0) {
 		spurious_interrupt();
 		return;
 	}

 	if (status & QCA955X_EXT_INT_PCIE_RC1_ALL) {
 		/* TODO: flush DDR? */
 		generic_handle_irq(ATH79_IP2_IRQ(0));
 	}

 	if (status & QCA955X_EXT_INT_WMAC_ALL) {
 		/* TODO: flush DDR? */
 		generic_handle_irq(ATH79_IP2_IRQ(1));
 	}
 }

 static void qca955x_ip3_irq_dispatch(struct irq_desc *desc)
 {
 	u32 status;

 	status = ath79_reset_rr(QCA955X_RESET_REG_EXT_INT_STATUS);
 	status &= QCA955X_EXT_INT_PCIE_RC2_ALL |
 		  QCA955X_EXT_INT_USB1 |
 		  QCA955X_EXT_INT_USB2;

 	if (status == 0) {
 		spurious_interrupt();
 		return;
 	}

 	if (status & QCA955X_EXT_INT_USB1) {
 		/* TODO: flush DDR? */
 		generic_handle_irq(ATH79_IP3_IRQ(0));
 	}

 	if (status & QCA955X_EXT_INT_USB2) {
 		/* TODO: flush DDR? */
 		generic_handle_irq(ATH79_IP3_IRQ(1));
 	}

 	if (status & QCA955X_EXT_INT_PCIE_RC2_ALL) {
 		/* TODO: flush DDR? */
 		generic_handle_irq(ATH79_IP3_IRQ(2));
 	}
 }

 static void qca955x_irq_init(void)
 {
 	int i;

 	for (i = ATH79_IP2_IRQ_BASE;
 	     i < ATH79_IP2_IRQ_BASE + ATH79_IP2_IRQ_COUNT; i++)
 		irq_set_chip_and_handler(i, &dummy_irq_chip,
 					 handle_level_irq);

 	irq_set_chained_handler(ATH79_CPU_IRQ(2), qca955x_ip2_irq_dispatch);

 	for (i = ATH79_IP3_IRQ_BASE;
 	     i < ATH79_IP3_IRQ_BASE + ATH79_IP3_IRQ_COUNT; i++)
 		irq_set_chip_and_handler(i, &dummy_irq_chip,
 					 handle_level_irq);

 	irq_set_chained_handler(ATH79_CPU_IRQ(3), qca955x_ip3_irq_dispatch);
 }

 /*
  * The IP2/IP3 lines are tied to a PCI/WMAC/USB device. Drivers for
  * these devices typically allocate coherent DMA memory, however the
  * DMA controller may still have some unsynchronized data in the FIFO.
  * Issue a flush in the handlers to ensure that the driver sees
  * the update.
  *
  * This array map the interrupt lines to the DDR write buffer channels.
  */

 static unsigned irq_wb_chan[8] = {
 	-1, -1, -1, -1, -1, -1, -1, -1,
 };

 asmlinkage void plat_irq_dispatch(void)
 {
 	unsigned long pending;
 	int irq;

 	pending = read_c0_status() & read_c0_cause() & ST0_IM;

 	if (!pending) {
 		spurious_interrupt();
 		return;
 	}

 	pending >>= CAUSEB_IP;
 	while (pending) {
 		irq = fls(pending) - 1;
 		if (irq < ARRAY_SIZE(irq_wb_chan) && irq_wb_chan[irq] != -1)
 			ath79_ddr_wb_flush(irq_wb_chan[irq]);
 		do_IRQ(MIPS_CPU_IRQ_BASE + irq);
 		pending &= ~BIT(irq);
 	}
 }

 #ifdef CONFIG_IRQCHIP
 static int misc_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hw)
 {
 	irq_set_chip_and_handler(irq, &ath79_misc_irq_chip, handle_level_irq);
 	return 0;
 }

 static const struct irq_domain_ops misc_irq_domain_ops = {
 	.xlate = irq_domain_xlate_onecell,
 	.map = misc_map,
 };

 static int __init ath79_misc_intc_of_init(
 	struct device_node *node, struct device_node *parent)
 {
 	void __iomem *base = ath79_reset_base;
 	struct irq_domain *domain;
 	int irq;

 	irq = irq_of_parse_and_map(node, 0);
 	if (!irq)
 		panic("Failed to get MISC IRQ");

 	domain = irq_domain_add_legacy(node, ATH79_MISC_IRQ_COUNT,
 			ATH79_MISC_IRQ_BASE, 0, &misc_irq_domain_ops, NULL);
 	if (!domain)
 		panic("Failed to add MISC irqdomain");

 	/* Disable and clear all interrupts */
 	__raw_writel(0, base + AR71XX_RESET_REG_MISC_INT_ENABLE);
 	__raw_writel(0, base + AR71XX_RESET_REG_MISC_INT_STATUS);


 	irq_set_chained_handler(irq, ath79_misc_irq_handler);

 	return 0;
 }

 static int __init ar7100_misc_intc_of_init(
 	struct device_node *node, struct device_node *parent)
 {
 	ath79_misc_irq_chip.irq_mask_ack = ar71xx_misc_irq_mask;
 	return ath79_misc_intc_of_init(node, parent);
 }

 IRQCHIP_DECLARE(ar7100_misc_intc, "qca,ar7100-misc-intc",
 		ar7100_misc_intc_of_init);

 static int __init ar7240_misc_intc_of_init(
 	struct device_node *node, struct device_node *parent)
 {
 	ath79_misc_irq_chip.irq_ack = ar724x_misc_irq_ack;
 	return ath79_misc_intc_of_init(node, parent);
 }

 IRQCHIP_DECLARE(ar7240_misc_intc, "qca,ar7240-misc-intc",
 		ar7240_misc_intc_of_init);

 static int __init ar79_cpu_intc_of_init(
 	struct device_node *node, struct device_node *parent)
 {
 	int err, i, count;

 	/* Fill the irq_wb_chan table */
 	count = of_count_phandle_with_args(
 		node, "qca,ddr-wb-channels", "#qca,ddr-wb-channel-cells");

 	for (i = 0; i < count; i++) {
 		struct of_phandle_args args;
 		u32 irq = i;

 		of_property_read_u32_index(
 			node, "qca,ddr-wb-channel-interrupts", i, &irq);
 		if (irq >= ARRAY_SIZE(irq_wb_chan))
 			continue;

 		err = of_parse_phandle_with_args(
 			node, "qca,ddr-wb-channels",
 			"#qca,ddr-wb-channel-cells",
 			i, &args);
 		if (err)
 			return err;

 		irq_wb_chan[irq] = args.args[0];
 		pr_info("IRQ: Set flush channel of IRQ%d to %d\n",
 			irq, args.args[0]);
 	}

 	return mips_cpu_irq_of_init(node, parent);
 }
 IRQCHIP_DECLARE(ar79_cpu_intc, "qca,ar7100-cpu-intc",
 		ar79_cpu_intc_of_init);

 #endif

 void __init arch_init_irq(void)
 {
 	if (mips_machtype == ATH79_MACH_GENERIC_OF) {
 		irqchip_init();
 		return;
 	}

 	if (soc_is_ar71xx() || soc_is_ar724x() ||
 	    soc_is_ar913x() || soc_is_ar933x()) {
 		irq_wb_chan[2] = 3;
 		irq_wb_chan[3] = 2;
 	} else if (soc_is_ar934x()) {
 		irq_wb_chan[3] = 2;
 	}

 	mips_cpu_irq_init();
 	ath79_misc_irq_init();

 	if (soc_is_ar934x())
 		ar934x_ip2_irq_init();
 	else if (soc_is_qca955x())
 		qca955x_irq_init();
 }
	/*
	* Atheros AR71xx/AR724x/AR913x specific interrupt handling
	*
	* Copyright (C) 2010-2011 Jaiganesh Narayanan <jnarayanan@atheros.com>
	* Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org>
	* Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
	*
	* Parts of this file are based on Atheros' 2.6.15/2.6.31 BSP
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 as published
	* by the Free Software Foundation.
	*/

	#include <linux/kernel.h>
	#include <linux/init.h>
	#include <linux/interrupt.h>
	#include <linux/irqchip.h>
	#include <linux/of_irq.h>

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

	#include <asm/mach-ath79/ath79.h>
	#include <asm/mach-ath79/ar71xx_regs.h>
	#include "common.h"
	#include "machtypes.h"

	static void ath79_misc_irq_handler(struct irq_desc *desc)
	{
	void __iomem *base = ath79_reset_base;
	u32 pending;

	pending = __raw_readl(base + AR71XX_RESET_REG_MISC_INT_STATUS) &
	__raw_readl(base + AR71XX_RESET_REG_MISC_INT_ENABLE);

	if (!pending) {
	spurious_interrupt();
	return;
	}

	while (pending) {
	int bit = __ffs(pending);

	generic_handle_irq(ATH79_MISC_IRQ(bit));
	pending &= ~BIT(bit);
	}
	}

	static void ar71xx_misc_irq_unmask(struct irq_data *d)
	{
	unsigned int irq = d->irq - ATH79_MISC_IRQ_BASE;
	void __iomem *base = ath79_reset_base;
	u32 t;

	t = __raw_readl(base + AR71XX_RESET_REG_MISC_INT_ENABLE);
	__raw_writel(t \| (1 << irq), base + AR71XX_RESET_REG_MISC_INT_ENABLE);

	/* flush write */
	__raw_readl(base + AR71XX_RESET_REG_MISC_INT_ENABLE);
	}

	static void ar71xx_misc_irq_mask(struct irq_data *d)
	{
	unsigned int irq = d->irq - ATH79_MISC_IRQ_BASE;
	void __iomem *base = ath79_reset_base;
	u32 t;

	t = __raw_readl(base + AR71XX_RESET_REG_MISC_INT_ENABLE);
	__raw_writel(t & ~(1 << irq), base + AR71XX_RESET_REG_MISC_INT_ENABLE);

	/* flush write */
	__raw_readl(base + AR71XX_RESET_REG_MISC_INT_ENABLE);
	}

	static void ar724x_misc_irq_ack(struct irq_data *d)
	{
	unsigned int irq = d->irq - ATH79_MISC_IRQ_BASE;
	void __iomem *base = ath79_reset_base;
	u32 t;

	t = __raw_readl(base + AR71XX_RESET_REG_MISC_INT_STATUS);
	__raw_writel(t & ~(1 << irq), base + AR71XX_RESET_REG_MISC_INT_STATUS);

	/* flush write */
	__raw_readl(base + AR71XX_RESET_REG_MISC_INT_STATUS);
	}

	static struct irq_chip ath79_misc_irq_chip = {
	.name = "MISC",
	.irq_unmask = ar71xx_misc_irq_unmask,
	.irq_mask = ar71xx_misc_irq_mask,
	};

	static void __init ath79_misc_irq_init(void)
	{
	void __iomem *base = ath79_reset_base;
	int i;

	__raw_writel(0, base + AR71XX_RESET_REG_MISC_INT_ENABLE);
	__raw_writel(0, base + AR71XX_RESET_REG_MISC_INT_STATUS);

	if (soc_is_ar71xx() \|\| soc_is_ar913x())
	ath79_misc_irq_chip.irq_mask_ack = ar71xx_misc_irq_mask;
	else if (soc_is_ar724x() \|\|
	soc_is_ar933x() \|\|
	soc_is_ar934x() \|\|
	soc_is_qca955x())
	ath79_misc_irq_chip.irq_ack = ar724x_misc_irq_ack;
	else
	BUG();

	for (i = ATH79_MISC_IRQ_BASE;
	i < ATH79_MISC_IRQ_BASE + ATH79_MISC_IRQ_COUNT; i++) {
	irq_set_chip_and_handler(i, &ath79_misc_irq_chip,
	handle_level_irq);
	}

	irq_set_chained_handler(ATH79_CPU_IRQ(6), ath79_misc_irq_handler);
	}

	static void ar934x_ip2_irq_dispatch(struct irq_desc *desc)
	{
	u32 status;

	status = ath79_reset_rr(AR934X_RESET_REG_PCIE_WMAC_INT_STATUS);

	if (status & AR934X_PCIE_WMAC_INT_PCIE_ALL) {
	ath79_ddr_wb_flush(3);
	generic_handle_irq(ATH79_IP2_IRQ(0));
	} else if (status & AR934X_PCIE_WMAC_INT_WMAC_ALL) {
	ath79_ddr_wb_flush(4);
	generic_handle_irq(ATH79_IP2_IRQ(1));
	} else {
	spurious_interrupt();
	}
	}

	static void ar934x_ip2_irq_init(void)
	{
	int i;

	for (i = ATH79_IP2_IRQ_BASE;
	i < ATH79_IP2_IRQ_BASE + ATH79_IP2_IRQ_COUNT; i++)
	irq_set_chip_and_handler(i, &dummy_irq_chip,
	handle_level_irq);

	irq_set_chained_handler(ATH79_CPU_IRQ(2), ar934x_ip2_irq_dispatch);
	}

	static void qca955x_ip2_irq_dispatch(struct irq_desc *desc)
	{
	u32 status;

	status = ath79_reset_rr(QCA955X_RESET_REG_EXT_INT_STATUS);
	status &= QCA955X_EXT_INT_PCIE_RC1_ALL \| QCA955X_EXT_INT_WMAC_ALL;

	if (status == 0) {
	spurious_interrupt();
	return;
	}

	if (status & QCA955X_EXT_INT_PCIE_RC1_ALL) {
	/* TODO: flush DDR? */
	generic_handle_irq(ATH79_IP2_IRQ(0));
	}

	if (status & QCA955X_EXT_INT_WMAC_ALL) {
	/* TODO: flush DDR? */
	generic_handle_irq(ATH79_IP2_IRQ(1));
	}
	}

	static void qca955x_ip3_irq_dispatch(struct irq_desc *desc)
	{
	u32 status;

	status = ath79_reset_rr(QCA955X_RESET_REG_EXT_INT_STATUS);
	status &= QCA955X_EXT_INT_PCIE_RC2_ALL \|
	QCA955X_EXT_INT_USB1 \|
	QCA955X_EXT_INT_USB2;

	if (status == 0) {
	spurious_interrupt();
	return;
	}

	if (status & QCA955X_EXT_INT_USB1) {
	/* TODO: flush DDR? */
	generic_handle_irq(ATH79_IP3_IRQ(0));
	}

	if (status & QCA955X_EXT_INT_USB2) {
	/* TODO: flush DDR? */
	generic_handle_irq(ATH79_IP3_IRQ(1));
	}

	if (status & QCA955X_EXT_INT_PCIE_RC2_ALL) {
	/* TODO: flush DDR? */
	generic_handle_irq(ATH79_IP3_IRQ(2));
	}
	}

	static void qca955x_irq_init(void)
	{
	int i;

	for (i = ATH79_IP2_IRQ_BASE;
	i < ATH79_IP2_IRQ_BASE + ATH79_IP2_IRQ_COUNT; i++)
	irq_set_chip_and_handler(i, &dummy_irq_chip,
	handle_level_irq);

	irq_set_chained_handler(ATH79_CPU_IRQ(2), qca955x_ip2_irq_dispatch);

	for (i = ATH79_IP3_IRQ_BASE;
	i < ATH79_IP3_IRQ_BASE + ATH79_IP3_IRQ_COUNT; i++)
	irq_set_chip_and_handler(i, &dummy_irq_chip,
	handle_level_irq);

	irq_set_chained_handler(ATH79_CPU_IRQ(3), qca955x_ip3_irq_dispatch);
	}

	/*
	* The IP2/IP3 lines are tied to a PCI/WMAC/USB device. Drivers for
	* these devices typically allocate coherent DMA memory, however the
	* DMA controller may still have some unsynchronized data in the FIFO.
	* Issue a flush in the handlers to ensure that the driver sees
	* the update.
	*
	* This array map the interrupt lines to the DDR write buffer channels.
	*/

	static unsigned irq_wb_chan[8] = {
	-1, -1, -1, -1, -1, -1, -1, -1,
	};

	asmlinkage void plat_irq_dispatch(void)
	{
	unsigned long pending;
	int irq;

	pending = read_c0_status() & read_c0_cause() & ST0_IM;

	if (!pending) {
	spurious_interrupt();
	return;
	}

	pending >>= CAUSEB_IP;
	while (pending) {
	irq = fls(pending) - 1;
	if (irq < ARRAY_SIZE(irq_wb_chan) && irq_wb_chan[irq] != -1)
	ath79_ddr_wb_flush(irq_wb_chan[irq]);
	do_IRQ(MIPS_CPU_IRQ_BASE + irq);
	pending &= ~BIT(irq);
	}
	}

	#ifdef CONFIG_IRQCHIP
	static int misc_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hw)
	{
	irq_set_chip_and_handler(irq, &ath79_misc_irq_chip, handle_level_irq);
	return 0;
	}

	static const struct irq_domain_ops misc_irq_domain_ops = {
	.xlate = irq_domain_xlate_onecell,
	.map = misc_map,
	};

	static int __init ath79_misc_intc_of_init(
	struct device_node node, struct device_node parent)
	{
	void __iomem *base = ath79_reset_base;
	struct irq_domain *domain;
	int irq;

	irq = irq_of_parse_and_map(node, 0);
	if (!irq)
	panic("Failed to get MISC IRQ");

	domain = irq_domain_add_legacy(node, ATH79_MISC_IRQ_COUNT,
	ATH79_MISC_IRQ_BASE, 0, &misc_irq_domain_ops, NULL);
	if (!domain)
	panic("Failed to add MISC irqdomain");

	/* Disable and clear all interrupts */
	__raw_writel(0, base + AR71XX_RESET_REG_MISC_INT_ENABLE);
	__raw_writel(0, base + AR71XX_RESET_REG_MISC_INT_STATUS);


	irq_set_chained_handler(irq, ath79_misc_irq_handler);

	return 0;
	}

	static int __init ar7100_misc_intc_of_init(
	struct device_node node, struct device_node parent)
	{
	ath79_misc_irq_chip.irq_mask_ack = ar71xx_misc_irq_mask;
	return ath79_misc_intc_of_init(node, parent);
	}

	IRQCHIP_DECLARE(ar7100_misc_intc, "qca,ar7100-misc-intc",
	ar7100_misc_intc_of_init);

	static int __init ar7240_misc_intc_of_init(
	struct device_node node, struct device_node parent)
	{
	ath79_misc_irq_chip.irq_ack = ar724x_misc_irq_ack;
	return ath79_misc_intc_of_init(node, parent);
	}

	IRQCHIP_DECLARE(ar7240_misc_intc, "qca,ar7240-misc-intc",
	ar7240_misc_intc_of_init);

	static int __init ar79_cpu_intc_of_init(
	struct device_node node, struct device_node parent)
	{
	int err, i, count;

	/* Fill the irq_wb_chan table */
	count = of_count_phandle_with_args(
	node, "qca,ddr-wb-channels", "#qca,ddr-wb-channel-cells");

	for (i = 0; i < count; i++) {
	struct of_phandle_args args;
	u32 irq = i;

	of_property_read_u32_index(
	node, "qca,ddr-wb-channel-interrupts", i, &irq);
	if (irq >= ARRAY_SIZE(irq_wb_chan))
	continue;

	err = of_parse_phandle_with_args(
	node, "qca,ddr-wb-channels",
	"#qca,ddr-wb-channel-cells",
	i, &args);
	if (err)
	return err;

	irq_wb_chan[irq] = args.args[0];
	pr_info("IRQ: Set flush channel of IRQ%d to %d\n",
	irq, args.args[0]);
	}

	return mips_cpu_irq_of_init(node, parent);
	}
	IRQCHIP_DECLARE(ar79_cpu_intc, "qca,ar7100-cpu-intc",
	ar79_cpu_intc_of_init);

	#endif

	void __init arch_init_irq(void)
	{
	if (mips_machtype == ATH79_MACH_GENERIC_OF) {
	irqchip_init();
	return;
	}

	if (soc_is_ar71xx() \|\| soc_is_ar724x() \|\|
	soc_is_ar913x() \|\| soc_is_ar933x()) {
	irq_wb_chan[2] = 3;
	irq_wb_chan[3] = 2;
	} else if (soc_is_ar934x()) {
	irq_wb_chan[3] = 2;
	}

	mips_cpu_irq_init();
	ath79_misc_irq_init();

	if (soc_is_ar934x())
	ar934x_ip2_irq_init();
	else if (soc_is_qca955x())
	qca955x_irq_init();
	}