arch/mips/bcm63xx/irq.c - arm/linux-arm-legacy - Git at Google

 /*
  * 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.
  *
  * Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
  * Copyright (C) 2008 Nicolas Schichan <nschichan@freebox.fr>
  */

 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/module.h>
 #include <linux/irq.h>
 #include <asm/irq_cpu.h>
 #include <asm/mipsregs.h>
 #include <bcm63xx_cpu.h>
 #include <bcm63xx_regs.h>
 #include <bcm63xx_io.h>
 #include <bcm63xx_irq.h>

 static void __dispatch_internal(void) __maybe_unused;
 static void __dispatch_internal_64(void) __maybe_unused;
 static void __internal_irq_mask_32(unsigned int irq) __maybe_unused;
 static void __internal_irq_mask_64(unsigned int irq) __maybe_unused;
 static void __internal_irq_unmask_32(unsigned int irq) __maybe_unused;
 static void __internal_irq_unmask_64(unsigned int irq) __maybe_unused;

 #ifndef BCMCPU_RUNTIME_DETECT
 #ifdef CONFIG_BCM63XX_CPU_3368
 #define irq_stat_reg		PERF_IRQSTAT_3368_REG
 #define irq_mask_reg		PERF_IRQMASK_3368_REG
 #define irq_bits		32
 #define is_ext_irq_cascaded	0
 #define ext_irq_start		0
 #define ext_irq_end		0
 #define ext_irq_count		4
 #define ext_irq_cfg_reg1	PERF_EXTIRQ_CFG_REG_3368
 #define ext_irq_cfg_reg2	0
 #endif
 #ifdef CONFIG_BCM63XX_CPU_6328
 #define irq_stat_reg		PERF_IRQSTAT_6328_REG
 #define irq_mask_reg		PERF_IRQMASK_6328_REG
 #define irq_bits		64
 #define is_ext_irq_cascaded	1
 #define ext_irq_start		(BCM_6328_EXT_IRQ0 - IRQ_INTERNAL_BASE)
 #define ext_irq_end		(BCM_6328_EXT_IRQ3 - IRQ_INTERNAL_BASE)
 #define ext_irq_count		4
 #define ext_irq_cfg_reg1	PERF_EXTIRQ_CFG_REG_6328
 #define ext_irq_cfg_reg2	0
 #endif
 #ifdef CONFIG_BCM63XX_CPU_6338
 #define irq_stat_reg		PERF_IRQSTAT_6338_REG
 #define irq_mask_reg		PERF_IRQMASK_6338_REG
 #define irq_bits		32
 #define is_ext_irq_cascaded	0
 #define ext_irq_start		0
 #define ext_irq_end		0
 #define ext_irq_count		4
 #define ext_irq_cfg_reg1	PERF_EXTIRQ_CFG_REG_6338
 #define ext_irq_cfg_reg2	0
 #endif
 #ifdef CONFIG_BCM63XX_CPU_6345
 #define irq_stat_reg		PERF_IRQSTAT_6345_REG
 #define irq_mask_reg		PERF_IRQMASK_6345_REG
 #define irq_bits		32
 #define is_ext_irq_cascaded	0
 #define ext_irq_start		0
 #define ext_irq_end		0
 #define ext_irq_count		4
 #define ext_irq_cfg_reg1	PERF_EXTIRQ_CFG_REG_6345
 #define ext_irq_cfg_reg2	0
 #endif
 #ifdef CONFIG_BCM63XX_CPU_6348
 #define irq_stat_reg		PERF_IRQSTAT_6348_REG
 #define irq_mask_reg		PERF_IRQMASK_6348_REG
 #define irq_bits		32
 #define is_ext_irq_cascaded	0
 #define ext_irq_start		0
 #define ext_irq_end		0
 #define ext_irq_count		4
 #define ext_irq_cfg_reg1	PERF_EXTIRQ_CFG_REG_6348
 #define ext_irq_cfg_reg2	0
 #endif
 #ifdef CONFIG_BCM63XX_CPU_6358
 #define irq_stat_reg		PERF_IRQSTAT_6358_REG
 #define irq_mask_reg		PERF_IRQMASK_6358_REG
 #define irq_bits		32
 #define is_ext_irq_cascaded	1
 #define ext_irq_start		(BCM_6358_EXT_IRQ0 - IRQ_INTERNAL_BASE)
 #define ext_irq_end		(BCM_6358_EXT_IRQ3 - IRQ_INTERNAL_BASE)
 #define ext_irq_count		4
 #define ext_irq_cfg_reg1	PERF_EXTIRQ_CFG_REG_6358
 #define ext_irq_cfg_reg2	0
 #endif
 #ifdef CONFIG_BCM63XX_CPU_6362
 #define irq_stat_reg		PERF_IRQSTAT_6362_REG
 #define irq_mask_reg		PERF_IRQMASK_6362_REG
 #define irq_bits		64
 #define is_ext_irq_cascaded	1
 #define ext_irq_start		(BCM_6362_EXT_IRQ0 - IRQ_INTERNAL_BASE)
 #define ext_irq_end		(BCM_6362_EXT_IRQ3 - IRQ_INTERNAL_BASE)
 #define ext_irq_count		4
 #define ext_irq_cfg_reg1	PERF_EXTIRQ_CFG_REG_6362
 #define ext_irq_cfg_reg2	0
 #endif
 #ifdef CONFIG_BCM63XX_CPU_6368
 #define irq_stat_reg		PERF_IRQSTAT_6368_REG
 #define irq_mask_reg		PERF_IRQMASK_6368_REG
 #define irq_bits		64
 #define is_ext_irq_cascaded	1
 #define ext_irq_start		(BCM_6368_EXT_IRQ0 - IRQ_INTERNAL_BASE)
 #define ext_irq_end		(BCM_6368_EXT_IRQ5 - IRQ_INTERNAL_BASE)
 #define ext_irq_count		6
 #define ext_irq_cfg_reg1	PERF_EXTIRQ_CFG_REG_6368
 #define ext_irq_cfg_reg2	PERF_EXTIRQ_CFG_REG2_6368
 #endif

 #if irq_bits == 32
 #define dispatch_internal			__dispatch_internal
 #define internal_irq_mask			__internal_irq_mask_32
 #define internal_irq_unmask			__internal_irq_unmask_32
 #else
 #define dispatch_internal			__dispatch_internal_64
 #define internal_irq_mask			__internal_irq_mask_64
 #define internal_irq_unmask			__internal_irq_unmask_64
 #endif

 #define irq_stat_addr	(bcm63xx_regset_address(RSET_PERF) + irq_stat_reg)
 #define irq_mask_addr	(bcm63xx_regset_address(RSET_PERF) + irq_mask_reg)

 static inline void bcm63xx_init_irq(void)
 {
 }
 #else /* ! BCMCPU_RUNTIME_DETECT */

 static u32 irq_stat_addr, irq_mask_addr;
 static void (*dispatch_internal)(void);
 static int is_ext_irq_cascaded;
 static unsigned int ext_irq_count;
 static unsigned int ext_irq_start, ext_irq_end;
 static unsigned int ext_irq_cfg_reg1, ext_irq_cfg_reg2;
 static void (*internal_irq_mask)(unsigned int irq);
 static void (*internal_irq_unmask)(unsigned int irq);

 static void bcm63xx_init_irq(void)
 {
 	int irq_bits;

 	irq_stat_addr = bcm63xx_regset_address(RSET_PERF);
 	irq_mask_addr = bcm63xx_regset_address(RSET_PERF);

 	switch (bcm63xx_get_cpu_id()) {
 	case BCM3368_CPU_ID:
 		irq_stat_addr += PERF_IRQSTAT_3368_REG;
 		irq_mask_addr += PERF_IRQMASK_3368_REG;
 		irq_bits = 32;
 		ext_irq_count = 4;
 		ext_irq_cfg_reg1 = PERF_EXTIRQ_CFG_REG_3368;
 		break;
 	case BCM6328_CPU_ID:
 		irq_stat_addr += PERF_IRQSTAT_6328_REG;
 		irq_mask_addr += PERF_IRQMASK_6328_REG;
 		irq_bits = 64;
 		ext_irq_count = 4;
 		is_ext_irq_cascaded = 1;
 		ext_irq_start = BCM_6328_EXT_IRQ0 - IRQ_INTERNAL_BASE;
 		ext_irq_end = BCM_6328_EXT_IRQ3 - IRQ_INTERNAL_BASE;
 		ext_irq_cfg_reg1 = PERF_EXTIRQ_CFG_REG_6328;
 		break;
 	case BCM6338_CPU_ID:
 		irq_stat_addr += PERF_IRQSTAT_6338_REG;
 		irq_mask_addr += PERF_IRQMASK_6338_REG;
 		irq_bits = 32;
 		ext_irq_count = 4;
 		ext_irq_cfg_reg1 = PERF_EXTIRQ_CFG_REG_6338;
 		break;
 	case BCM6345_CPU_ID:
 		irq_stat_addr += PERF_IRQSTAT_6345_REG;
 		irq_mask_addr += PERF_IRQMASK_6345_REG;
 		irq_bits = 32;
 		ext_irq_count = 4;
 		ext_irq_cfg_reg1 = PERF_EXTIRQ_CFG_REG_6345;
 		break;
 	case BCM6348_CPU_ID:
 		irq_stat_addr += PERF_IRQSTAT_6348_REG;
 		irq_mask_addr += PERF_IRQMASK_6348_REG;
 		irq_bits = 32;
 		ext_irq_count = 4;
 		ext_irq_cfg_reg1 = PERF_EXTIRQ_CFG_REG_6348;
 		break;
 	case BCM6358_CPU_ID:
 		irq_stat_addr += PERF_IRQSTAT_6358_REG;
 		irq_mask_addr += PERF_IRQMASK_6358_REG;
 		irq_bits = 32;
 		ext_irq_count = 4;
 		is_ext_irq_cascaded = 1;
 		ext_irq_start = BCM_6358_EXT_IRQ0 - IRQ_INTERNAL_BASE;
 		ext_irq_end = BCM_6358_EXT_IRQ3 - IRQ_INTERNAL_BASE;
 		ext_irq_cfg_reg1 = PERF_EXTIRQ_CFG_REG_6358;
 		break;
 	case BCM6362_CPU_ID:
 		irq_stat_addr += PERF_IRQSTAT_6362_REG;
 		irq_mask_addr += PERF_IRQMASK_6362_REG;
 		irq_bits = 64;
 		ext_irq_count = 4;
 		is_ext_irq_cascaded = 1;
 		ext_irq_start = BCM_6362_EXT_IRQ0 - IRQ_INTERNAL_BASE;
 		ext_irq_end = BCM_6362_EXT_IRQ3 - IRQ_INTERNAL_BASE;
 		ext_irq_cfg_reg1 = PERF_EXTIRQ_CFG_REG_6362;
 		break;
 	case BCM6368_CPU_ID:
 		irq_stat_addr += PERF_IRQSTAT_6368_REG;
 		irq_mask_addr += PERF_IRQMASK_6368_REG;
 		irq_bits = 64;
 		ext_irq_count = 6;
 		is_ext_irq_cascaded = 1;
 		ext_irq_start = BCM_6368_EXT_IRQ0 - IRQ_INTERNAL_BASE;
 		ext_irq_end = BCM_6368_EXT_IRQ5 - IRQ_INTERNAL_BASE;
 		ext_irq_cfg_reg1 = PERF_EXTIRQ_CFG_REG_6368;
 		ext_irq_cfg_reg2 = PERF_EXTIRQ_CFG_REG2_6368;
 		break;
 	default:
 		BUG();
 	}

 	if (irq_bits == 32) {
 		dispatch_internal = __dispatch_internal;
 		internal_irq_mask = __internal_irq_mask_32;
 		internal_irq_unmask = __internal_irq_unmask_32;
 	} else {
 		dispatch_internal = __dispatch_internal_64;
 		internal_irq_mask = __internal_irq_mask_64;
 		internal_irq_unmask = __internal_irq_unmask_64;
 	}
 }
 #endif /* ! BCMCPU_RUNTIME_DETECT */

 static inline u32 get_ext_irq_perf_reg(int irq)
 {
 	if (irq < 4)
 		return ext_irq_cfg_reg1;
 	return ext_irq_cfg_reg2;
 }

 static inline void handle_internal(int intbit)
 {
 	if (is_ext_irq_cascaded &&
 	    intbit >= ext_irq_start && intbit <= ext_irq_end)
 		do_IRQ(intbit - ext_irq_start + IRQ_EXTERNAL_BASE);
 	else
 		do_IRQ(intbit + IRQ_INTERNAL_BASE);
 }

 /*
  * dispatch internal devices IRQ (uart, enet, watchdog, ...). do not
  * prioritize any interrupt relatively to another. the static counter
  * will resume the loop where it ended the last time we left this
  * function.
  */
 static void __dispatch_internal(void)
 {
 	u32 pending;
 	static int i;

 	pending = bcm_readl(irq_stat_addr) & bcm_readl(irq_mask_addr);

 	if (!pending)
 		return ;

 	while (1) {
 		int to_call = i;

 		i = (i + 1) & 0x1f;
 		if (pending & (1 << to_call)) {
 			handle_internal(to_call);
 			break;
 		}
 	}
 }

 static void __dispatch_internal_64(void)
 {
 	u64 pending;
 	static int i;

 	pending = bcm_readq(irq_stat_addr) & bcm_readq(irq_mask_addr);

 	if (!pending)
 		return ;

 	while (1) {
 		int to_call = i;

 		i = (i + 1) & 0x3f;
 		if (pending & (1ull << to_call)) {
 			handle_internal(to_call);
 			break;
 		}
 	}
 }

 asmlinkage void plat_irq_dispatch(void)
 {
 	u32 cause;

 	do {
 		cause = read_c0_cause() & read_c0_status() & ST0_IM;

 		if (!cause)
 			break;

 		if (cause & CAUSEF_IP7)
 			do_IRQ(7);
 		if (cause & CAUSEF_IP0)
 			do_IRQ(0);
 		if (cause & CAUSEF_IP1)
 			do_IRQ(1);
 		if (cause & CAUSEF_IP2)
 			dispatch_internal();
 		if (!is_ext_irq_cascaded) {
 			if (cause & CAUSEF_IP3)
 				do_IRQ(IRQ_EXT_0);
 			if (cause & CAUSEF_IP4)
 				do_IRQ(IRQ_EXT_1);
 			if (cause & CAUSEF_IP5)
 				do_IRQ(IRQ_EXT_2);
 			if (cause & CAUSEF_IP6)
 				do_IRQ(IRQ_EXT_3);
 		}
 	} while (1);
 }

 /*
  * internal IRQs operations: only mask/unmask on PERF irq mask
  * register.
  */
 static void __internal_irq_mask_32(unsigned int irq)
 {
 	u32 mask;

 	mask = bcm_readl(irq_mask_addr);
 	mask &= ~(1 << irq);
 	bcm_writel(mask, irq_mask_addr);
 }

 static void __internal_irq_mask_64(unsigned int irq)
 {
 	u64 mask;

 	mask = bcm_readq(irq_mask_addr);
 	mask &= ~(1ull << irq);
 	bcm_writeq(mask, irq_mask_addr);
 }

 static void __internal_irq_unmask_32(unsigned int irq)
 {
 	u32 mask;

 	mask = bcm_readl(irq_mask_addr);
 	mask |= (1 << irq);
 	bcm_writel(mask, irq_mask_addr);
 }

 static void __internal_irq_unmask_64(unsigned int irq)
 {
 	u64 mask;

 	mask = bcm_readq(irq_mask_addr);
 	mask |= (1ull << irq);
 	bcm_writeq(mask, irq_mask_addr);
 }

 static void bcm63xx_internal_irq_mask(struct irq_data *d)
 {
 	internal_irq_mask(d->irq - IRQ_INTERNAL_BASE);
 }

 static void bcm63xx_internal_irq_unmask(struct irq_data *d)
 {
 	internal_irq_unmask(d->irq - IRQ_INTERNAL_BASE);
 }

 /*
  * external IRQs operations: mask/unmask and clear on PERF external
  * irq control register.
  */
 static void bcm63xx_external_irq_mask(struct irq_data *d)
 {
 	unsigned int irq = d->irq - IRQ_EXTERNAL_BASE;
 	u32 reg, regaddr;

 	regaddr = get_ext_irq_perf_reg(irq);
 	reg = bcm_perf_readl(regaddr);

 	if (BCMCPU_IS_6348())
 		reg &= ~EXTIRQ_CFG_MASK_6348(irq % 4);
 	else
 		reg &= ~EXTIRQ_CFG_MASK(irq % 4);

 	bcm_perf_writel(reg, regaddr);
 	if (is_ext_irq_cascaded)
 		internal_irq_mask(irq + ext_irq_start);
 }

 static void bcm63xx_external_irq_unmask(struct irq_data *d)
 {
 	unsigned int irq = d->irq - IRQ_EXTERNAL_BASE;
 	u32 reg, regaddr;

 	regaddr = get_ext_irq_perf_reg(irq);
 	reg = bcm_perf_readl(regaddr);

 	if (BCMCPU_IS_6348())
 		reg |= EXTIRQ_CFG_MASK_6348(irq % 4);
 	else
 		reg |= EXTIRQ_CFG_MASK(irq % 4);

 	bcm_perf_writel(reg, regaddr);

 	if (is_ext_irq_cascaded)
 		internal_irq_unmask(irq + ext_irq_start);
 }

 static void bcm63xx_external_irq_clear(struct irq_data *d)
 {
 	unsigned int irq = d->irq - IRQ_EXTERNAL_BASE;
 	u32 reg, regaddr;

 	regaddr = get_ext_irq_perf_reg(irq);
 	reg = bcm_perf_readl(regaddr);

 	if (BCMCPU_IS_6348())
 		reg |= EXTIRQ_CFG_CLEAR_6348(irq % 4);
 	else
 		reg |= EXTIRQ_CFG_CLEAR(irq % 4);

 	bcm_perf_writel(reg, regaddr);
 }

 static int bcm63xx_external_irq_set_type(struct irq_data *d,
 					 unsigned int flow_type)
 {
 	unsigned int irq = d->irq - IRQ_EXTERNAL_BASE;
 	u32 reg, regaddr;
 	int levelsense, sense, bothedge;

 	flow_type &= IRQ_TYPE_SENSE_MASK;

 	if (flow_type == IRQ_TYPE_NONE)
 		flow_type = IRQ_TYPE_LEVEL_LOW;

 	levelsense = sense = bothedge = 0;
 	switch (flow_type) {
 	case IRQ_TYPE_EDGE_BOTH:
 		bothedge = 1;
 		break;

 	case IRQ_TYPE_EDGE_RISING:
 		sense = 1;
 		break;

 	case IRQ_TYPE_EDGE_FALLING:
 		break;

 	case IRQ_TYPE_LEVEL_HIGH:
 		levelsense = 1;
 		sense = 1;
 		break;

 	case IRQ_TYPE_LEVEL_LOW:
 		levelsense = 1;
 		break;

 	default:
 		printk(KERN_ERR "bogus flow type combination given !\n");
 		return -EINVAL;
 	}

 	regaddr = get_ext_irq_perf_reg(irq);
 	reg = bcm_perf_readl(regaddr);
 	irq %= 4;

 	switch (bcm63xx_get_cpu_id()) {
 	case BCM6348_CPU_ID:
 		if (levelsense)
 			reg |= EXTIRQ_CFG_LEVELSENSE_6348(irq);
 		else
 			reg &= ~EXTIRQ_CFG_LEVELSENSE_6348(irq);
 		if (sense)
 			reg |= EXTIRQ_CFG_SENSE_6348(irq);
 		else
 			reg &= ~EXTIRQ_CFG_SENSE_6348(irq);
 		if (bothedge)
 			reg |= EXTIRQ_CFG_BOTHEDGE_6348(irq);
 		else
 			reg &= ~EXTIRQ_CFG_BOTHEDGE_6348(irq);
 		break;

 	case BCM3368_CPU_ID:
 	case BCM6328_CPU_ID:
 	case BCM6338_CPU_ID:
 	case BCM6345_CPU_ID:
 	case BCM6358_CPU_ID:
 	case BCM6362_CPU_ID:
 	case BCM6368_CPU_ID:
 		if (levelsense)
 			reg |= EXTIRQ_CFG_LEVELSENSE(irq);
 		else
 			reg &= ~EXTIRQ_CFG_LEVELSENSE(irq);
 		if (sense)
 			reg |= EXTIRQ_CFG_SENSE(irq);
 		else
 			reg &= ~EXTIRQ_CFG_SENSE(irq);
 		if (bothedge)
 			reg |= EXTIRQ_CFG_BOTHEDGE(irq);
 		else
 			reg &= ~EXTIRQ_CFG_BOTHEDGE(irq);
 		break;
 	default:
 		BUG();
 	}

 	bcm_perf_writel(reg, regaddr);

 	irqd_set_trigger_type(d, flow_type);
 	if (flow_type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
 		__irq_set_handler_locked(d->irq, handle_level_irq);
 	else
 		__irq_set_handler_locked(d->irq, handle_edge_irq);

 	return IRQ_SET_MASK_OK_NOCOPY;
 }

 static struct irq_chip bcm63xx_internal_irq_chip = {
 	.name		= "bcm63xx_ipic",
 	.irq_mask	= bcm63xx_internal_irq_mask,
 	.irq_unmask	= bcm63xx_internal_irq_unmask,
 };

 static struct irq_chip bcm63xx_external_irq_chip = {
 	.name		= "bcm63xx_epic",
 	.irq_ack	= bcm63xx_external_irq_clear,

 	.irq_mask	= bcm63xx_external_irq_mask,
 	.irq_unmask	= bcm63xx_external_irq_unmask,

 	.irq_set_type	= bcm63xx_external_irq_set_type,
 };

 static struct irqaction cpu_ip2_cascade_action = {
 	.handler	= no_action,
 	.name		= "cascade_ip2",
 	.flags		= IRQF_NO_THREAD,
 };

 static struct irqaction cpu_ext_cascade_action = {
 	.handler	= no_action,
 	.name		= "cascade_extirq",
 	.flags		= IRQF_NO_THREAD,
 };

 void __init arch_init_irq(void)
 {
 	int i;

 	bcm63xx_init_irq();
 	mips_cpu_irq_init();
 	for (i = IRQ_INTERNAL_BASE; i < NR_IRQS; ++i)
 		irq_set_chip_and_handler(i, &bcm63xx_internal_irq_chip,
 					 handle_level_irq);

 	for (i = IRQ_EXTERNAL_BASE; i < IRQ_EXTERNAL_BASE + ext_irq_count; ++i)
 		irq_set_chip_and_handler(i, &bcm63xx_external_irq_chip,
 					 handle_edge_irq);

 	if (!is_ext_irq_cascaded) {
 		for (i = 3; i < 3 + ext_irq_count; ++i)
 			setup_irq(MIPS_CPU_IRQ_BASE + i, &cpu_ext_cascade_action);
 	}

 	setup_irq(MIPS_CPU_IRQ_BASE + 2, &cpu_ip2_cascade_action);
 }
	/*
	* 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.
	*
	* Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
	* Copyright (C) 2008 Nicolas Schichan <nschichan@freebox.fr>
	*/

	#include <linux/kernel.h>
	#include <linux/init.h>
	#include <linux/interrupt.h>
	#include <linux/module.h>
	#include <linux/irq.h>
	#include <asm/irq_cpu.h>
	#include <asm/mipsregs.h>
	#include <bcm63xx_cpu.h>
	#include <bcm63xx_regs.h>
	#include <bcm63xx_io.h>
	#include <bcm63xx_irq.h>

	static void __dispatch_internal(void) __maybe_unused;
	static void __dispatch_internal_64(void) __maybe_unused;
	static void __internal_irq_mask_32(unsigned int irq) __maybe_unused;
	static void __internal_irq_mask_64(unsigned int irq) __maybe_unused;
	static void __internal_irq_unmask_32(unsigned int irq) __maybe_unused;
	static void __internal_irq_unmask_64(unsigned int irq) __maybe_unused;

	#ifndef BCMCPU_RUNTIME_DETECT
	#ifdef CONFIG_BCM63XX_CPU_3368
	#define irq_stat_reg PERF_IRQSTAT_3368_REG
	#define irq_mask_reg PERF_IRQMASK_3368_REG
	#define irq_bits 32
	#define is_ext_irq_cascaded 0
	#define ext_irq_start 0
	#define ext_irq_end 0
	#define ext_irq_count 4
	#define ext_irq_cfg_reg1 PERF_EXTIRQ_CFG_REG_3368
	#define ext_irq_cfg_reg2 0
	#endif
	#ifdef CONFIG_BCM63XX_CPU_6328
	#define irq_stat_reg PERF_IRQSTAT_6328_REG
	#define irq_mask_reg PERF_IRQMASK_6328_REG
	#define irq_bits 64
	#define is_ext_irq_cascaded 1
	#define ext_irq_start (BCM_6328_EXT_IRQ0 - IRQ_INTERNAL_BASE)
	#define ext_irq_end (BCM_6328_EXT_IRQ3 - IRQ_INTERNAL_BASE)
	#define ext_irq_count 4
	#define ext_irq_cfg_reg1 PERF_EXTIRQ_CFG_REG_6328
	#define ext_irq_cfg_reg2 0
	#endif
	#ifdef CONFIG_BCM63XX_CPU_6338
	#define irq_stat_reg PERF_IRQSTAT_6338_REG
	#define irq_mask_reg PERF_IRQMASK_6338_REG
	#define irq_bits 32
	#define is_ext_irq_cascaded 0
	#define ext_irq_start 0
	#define ext_irq_end 0
	#define ext_irq_count 4
	#define ext_irq_cfg_reg1 PERF_EXTIRQ_CFG_REG_6338
	#define ext_irq_cfg_reg2 0
	#endif
	#ifdef CONFIG_BCM63XX_CPU_6345
	#define irq_stat_reg PERF_IRQSTAT_6345_REG
	#define irq_mask_reg PERF_IRQMASK_6345_REG
	#define irq_bits 32
	#define is_ext_irq_cascaded 0
	#define ext_irq_start 0
	#define ext_irq_end 0
	#define ext_irq_count 4
	#define ext_irq_cfg_reg1 PERF_EXTIRQ_CFG_REG_6345
	#define ext_irq_cfg_reg2 0
	#endif
	#ifdef CONFIG_BCM63XX_CPU_6348
	#define irq_stat_reg PERF_IRQSTAT_6348_REG
	#define irq_mask_reg PERF_IRQMASK_6348_REG
	#define irq_bits 32
	#define is_ext_irq_cascaded 0
	#define ext_irq_start 0
	#define ext_irq_end 0
	#define ext_irq_count 4
	#define ext_irq_cfg_reg1 PERF_EXTIRQ_CFG_REG_6348
	#define ext_irq_cfg_reg2 0
	#endif
	#ifdef CONFIG_BCM63XX_CPU_6358
	#define irq_stat_reg PERF_IRQSTAT_6358_REG
	#define irq_mask_reg PERF_IRQMASK_6358_REG
	#define irq_bits 32
	#define is_ext_irq_cascaded 1
	#define ext_irq_start (BCM_6358_EXT_IRQ0 - IRQ_INTERNAL_BASE)
	#define ext_irq_end (BCM_6358_EXT_IRQ3 - IRQ_INTERNAL_BASE)
	#define ext_irq_count 4
	#define ext_irq_cfg_reg1 PERF_EXTIRQ_CFG_REG_6358
	#define ext_irq_cfg_reg2 0
	#endif
	#ifdef CONFIG_BCM63XX_CPU_6362
	#define irq_stat_reg PERF_IRQSTAT_6362_REG
	#define irq_mask_reg PERF_IRQMASK_6362_REG
	#define irq_bits 64
	#define is_ext_irq_cascaded 1
	#define ext_irq_start (BCM_6362_EXT_IRQ0 - IRQ_INTERNAL_BASE)
	#define ext_irq_end (BCM_6362_EXT_IRQ3 - IRQ_INTERNAL_BASE)
	#define ext_irq_count 4
	#define ext_irq_cfg_reg1 PERF_EXTIRQ_CFG_REG_6362
	#define ext_irq_cfg_reg2 0
	#endif
	#ifdef CONFIG_BCM63XX_CPU_6368
	#define irq_stat_reg PERF_IRQSTAT_6368_REG
	#define irq_mask_reg PERF_IRQMASK_6368_REG
	#define irq_bits 64
	#define is_ext_irq_cascaded 1
	#define ext_irq_start (BCM_6368_EXT_IRQ0 - IRQ_INTERNAL_BASE)
	#define ext_irq_end (BCM_6368_EXT_IRQ5 - IRQ_INTERNAL_BASE)
	#define ext_irq_count 6
	#define ext_irq_cfg_reg1 PERF_EXTIRQ_CFG_REG_6368
	#define ext_irq_cfg_reg2 PERF_EXTIRQ_CFG_REG2_6368
	#endif

	#if irq_bits == 32
	#define dispatch_internal __dispatch_internal
	#define internal_irq_mask __internal_irq_mask_32
	#define internal_irq_unmask __internal_irq_unmask_32
	#else
	#define dispatch_internal __dispatch_internal_64
	#define internal_irq_mask __internal_irq_mask_64
	#define internal_irq_unmask __internal_irq_unmask_64
	#endif

	#define irq_stat_addr (bcm63xx_regset_address(RSET_PERF) + irq_stat_reg)
	#define irq_mask_addr (bcm63xx_regset_address(RSET_PERF) + irq_mask_reg)

	static inline void bcm63xx_init_irq(void)
	{
	}
	#else /* ! BCMCPU_RUNTIME_DETECT */

	static u32 irq_stat_addr, irq_mask_addr;
	static void (*dispatch_internal)(void);
	static int is_ext_irq_cascaded;
	static unsigned int ext_irq_count;
	static unsigned int ext_irq_start, ext_irq_end;
	static unsigned int ext_irq_cfg_reg1, ext_irq_cfg_reg2;
	static void (*internal_irq_mask)(unsigned int irq);
	static void (*internal_irq_unmask)(unsigned int irq);

	static void bcm63xx_init_irq(void)
	{
	int irq_bits;

	irq_stat_addr = bcm63xx_regset_address(RSET_PERF);
	irq_mask_addr = bcm63xx_regset_address(RSET_PERF);

	switch (bcm63xx_get_cpu_id()) {
	case BCM3368_CPU_ID:
	irq_stat_addr += PERF_IRQSTAT_3368_REG;
	irq_mask_addr += PERF_IRQMASK_3368_REG;
	irq_bits = 32;
	ext_irq_count = 4;
	ext_irq_cfg_reg1 = PERF_EXTIRQ_CFG_REG_3368;
	break;
	case BCM6328_CPU_ID:
	irq_stat_addr += PERF_IRQSTAT_6328_REG;
	irq_mask_addr += PERF_IRQMASK_6328_REG;
	irq_bits = 64;
	ext_irq_count = 4;
	is_ext_irq_cascaded = 1;
	ext_irq_start = BCM_6328_EXT_IRQ0 - IRQ_INTERNAL_BASE;
	ext_irq_end = BCM_6328_EXT_IRQ3 - IRQ_INTERNAL_BASE;
	ext_irq_cfg_reg1 = PERF_EXTIRQ_CFG_REG_6328;
	break;
	case BCM6338_CPU_ID:
	irq_stat_addr += PERF_IRQSTAT_6338_REG;
	irq_mask_addr += PERF_IRQMASK_6338_REG;
	irq_bits = 32;
	ext_irq_count = 4;
	ext_irq_cfg_reg1 = PERF_EXTIRQ_CFG_REG_6338;
	break;
	case BCM6345_CPU_ID:
	irq_stat_addr += PERF_IRQSTAT_6345_REG;
	irq_mask_addr += PERF_IRQMASK_6345_REG;
	irq_bits = 32;
	ext_irq_count = 4;
	ext_irq_cfg_reg1 = PERF_EXTIRQ_CFG_REG_6345;
	break;
	case BCM6348_CPU_ID:
	irq_stat_addr += PERF_IRQSTAT_6348_REG;
	irq_mask_addr += PERF_IRQMASK_6348_REG;
	irq_bits = 32;
	ext_irq_count = 4;
	ext_irq_cfg_reg1 = PERF_EXTIRQ_CFG_REG_6348;
	break;
	case BCM6358_CPU_ID:
	irq_stat_addr += PERF_IRQSTAT_6358_REG;
	irq_mask_addr += PERF_IRQMASK_6358_REG;
	irq_bits = 32;
	ext_irq_count = 4;
	is_ext_irq_cascaded = 1;
	ext_irq_start = BCM_6358_EXT_IRQ0 - IRQ_INTERNAL_BASE;
	ext_irq_end = BCM_6358_EXT_IRQ3 - IRQ_INTERNAL_BASE;
	ext_irq_cfg_reg1 = PERF_EXTIRQ_CFG_REG_6358;
	break;
	case BCM6362_CPU_ID:
	irq_stat_addr += PERF_IRQSTAT_6362_REG;
	irq_mask_addr += PERF_IRQMASK_6362_REG;
	irq_bits = 64;
	ext_irq_count = 4;
	is_ext_irq_cascaded = 1;
	ext_irq_start = BCM_6362_EXT_IRQ0 - IRQ_INTERNAL_BASE;
	ext_irq_end = BCM_6362_EXT_IRQ3 - IRQ_INTERNAL_BASE;
	ext_irq_cfg_reg1 = PERF_EXTIRQ_CFG_REG_6362;
	break;
	case BCM6368_CPU_ID:
	irq_stat_addr += PERF_IRQSTAT_6368_REG;
	irq_mask_addr += PERF_IRQMASK_6368_REG;
	irq_bits = 64;
	ext_irq_count = 6;
	is_ext_irq_cascaded = 1;
	ext_irq_start = BCM_6368_EXT_IRQ0 - IRQ_INTERNAL_BASE;
	ext_irq_end = BCM_6368_EXT_IRQ5 - IRQ_INTERNAL_BASE;
	ext_irq_cfg_reg1 = PERF_EXTIRQ_CFG_REG_6368;
	ext_irq_cfg_reg2 = PERF_EXTIRQ_CFG_REG2_6368;
	break;
	default:
	BUG();
	}

	if (irq_bits == 32) {
	dispatch_internal = __dispatch_internal;
	internal_irq_mask = __internal_irq_mask_32;
	internal_irq_unmask = __internal_irq_unmask_32;
	} else {
	dispatch_internal = __dispatch_internal_64;
	internal_irq_mask = __internal_irq_mask_64;
	internal_irq_unmask = __internal_irq_unmask_64;
	}
	}
	#endif /* ! BCMCPU_RUNTIME_DETECT */

	static inline u32 get_ext_irq_perf_reg(int irq)
	{
	if (irq < 4)
	return ext_irq_cfg_reg1;
	return ext_irq_cfg_reg2;
	}

	static inline void handle_internal(int intbit)
	{
	if (is_ext_irq_cascaded &&
	intbit >= ext_irq_start && intbit <= ext_irq_end)
	do_IRQ(intbit - ext_irq_start + IRQ_EXTERNAL_BASE);
	else
	do_IRQ(intbit + IRQ_INTERNAL_BASE);
	}

	/*
	* dispatch internal devices IRQ (uart, enet, watchdog, ...). do not
	* prioritize any interrupt relatively to another. the static counter
	* will resume the loop where it ended the last time we left this
	* function.
	*/
	static void __dispatch_internal(void)
	{
	u32 pending;
	static int i;

	pending = bcm_readl(irq_stat_addr) & bcm_readl(irq_mask_addr);

	if (!pending)
	return ;

	while (1) {
	int to_call = i;

	i = (i + 1) & 0x1f;
	if (pending & (1 << to_call)) {
	handle_internal(to_call);
	break;
	}
	}
	}

	static void __dispatch_internal_64(void)
	{
	u64 pending;
	static int i;

	pending = bcm_readq(irq_stat_addr) & bcm_readq(irq_mask_addr);

	if (!pending)
	return ;

	while (1) {
	int to_call = i;

	i = (i + 1) & 0x3f;
	if (pending & (1ull << to_call)) {
	handle_internal(to_call);
	break;
	}
	}
	}

	asmlinkage void plat_irq_dispatch(void)
	{
	u32 cause;

	do {
	cause = read_c0_cause() & read_c0_status() & ST0_IM;

	if (!cause)
	break;

	if (cause & CAUSEF_IP7)
	do_IRQ(7);
	if (cause & CAUSEF_IP0)
	do_IRQ(0);
	if (cause & CAUSEF_IP1)
	do_IRQ(1);
	if (cause & CAUSEF_IP2)
	dispatch_internal();
	if (!is_ext_irq_cascaded) {
	if (cause & CAUSEF_IP3)
	do_IRQ(IRQ_EXT_0);
	if (cause & CAUSEF_IP4)
	do_IRQ(IRQ_EXT_1);
	if (cause & CAUSEF_IP5)
	do_IRQ(IRQ_EXT_2);
	if (cause & CAUSEF_IP6)
	do_IRQ(IRQ_EXT_3);
	}
	} while (1);
	}

	/*
	* internal IRQs operations: only mask/unmask on PERF irq mask
	* register.
	*/
	static void __internal_irq_mask_32(unsigned int irq)
	{
	u32 mask;

	mask = bcm_readl(irq_mask_addr);
	mask &= ~(1 << irq);
	bcm_writel(mask, irq_mask_addr);
	}

	static void __internal_irq_mask_64(unsigned int irq)
	{
	u64 mask;

	mask = bcm_readq(irq_mask_addr);
	mask &= ~(1ull << irq);
	bcm_writeq(mask, irq_mask_addr);
	}

	static void __internal_irq_unmask_32(unsigned int irq)
	{
	u32 mask;

	mask = bcm_readl(irq_mask_addr);
	mask \|= (1 << irq);
	bcm_writel(mask, irq_mask_addr);
	}

	static void __internal_irq_unmask_64(unsigned int irq)
	{
	u64 mask;

	mask = bcm_readq(irq_mask_addr);
	mask \|= (1ull << irq);
	bcm_writeq(mask, irq_mask_addr);
	}

	static void bcm63xx_internal_irq_mask(struct irq_data *d)
	{
	internal_irq_mask(d->irq - IRQ_INTERNAL_BASE);
	}

	static void bcm63xx_internal_irq_unmask(struct irq_data *d)
	{
	internal_irq_unmask(d->irq - IRQ_INTERNAL_BASE);
	}

	/*
	* external IRQs operations: mask/unmask and clear on PERF external
	* irq control register.
	*/
	static void bcm63xx_external_irq_mask(struct irq_data *d)
	{
	unsigned int irq = d->irq - IRQ_EXTERNAL_BASE;
	u32 reg, regaddr;

	regaddr = get_ext_irq_perf_reg(irq);
	reg = bcm_perf_readl(regaddr);

	if (BCMCPU_IS_6348())
	reg &= ~EXTIRQ_CFG_MASK_6348(irq % 4);
	else
	reg &= ~EXTIRQ_CFG_MASK(irq % 4);

	bcm_perf_writel(reg, regaddr);
	if (is_ext_irq_cascaded)
	internal_irq_mask(irq + ext_irq_start);
	}

	static void bcm63xx_external_irq_unmask(struct irq_data *d)
	{
	unsigned int irq = d->irq - IRQ_EXTERNAL_BASE;
	u32 reg, regaddr;

	regaddr = get_ext_irq_perf_reg(irq);
	reg = bcm_perf_readl(regaddr);

	if (BCMCPU_IS_6348())
	reg \|= EXTIRQ_CFG_MASK_6348(irq % 4);
	else
	reg \|= EXTIRQ_CFG_MASK(irq % 4);

	bcm_perf_writel(reg, regaddr);

	if (is_ext_irq_cascaded)
	internal_irq_unmask(irq + ext_irq_start);
	}

	static void bcm63xx_external_irq_clear(struct irq_data *d)
	{
	unsigned int irq = d->irq - IRQ_EXTERNAL_BASE;
	u32 reg, regaddr;

	regaddr = get_ext_irq_perf_reg(irq);
	reg = bcm_perf_readl(regaddr);

	if (BCMCPU_IS_6348())
	reg \|= EXTIRQ_CFG_CLEAR_6348(irq % 4);
	else
	reg \|= EXTIRQ_CFG_CLEAR(irq % 4);

	bcm_perf_writel(reg, regaddr);
	}

	static int bcm63xx_external_irq_set_type(struct irq_data *d,
	unsigned int flow_type)
	{
	unsigned int irq = d->irq - IRQ_EXTERNAL_BASE;
	u32 reg, regaddr;
	int levelsense, sense, bothedge;

	flow_type &= IRQ_TYPE_SENSE_MASK;

	if (flow_type == IRQ_TYPE_NONE)
	flow_type = IRQ_TYPE_LEVEL_LOW;

	levelsense = sense = bothedge = 0;
	switch (flow_type) {
	case IRQ_TYPE_EDGE_BOTH:
	bothedge = 1;
	break;

	case IRQ_TYPE_EDGE_RISING:
	sense = 1;
	break;

	case IRQ_TYPE_EDGE_FALLING:
	break;

	case IRQ_TYPE_LEVEL_HIGH:
	levelsense = 1;
	sense = 1;
	break;

	case IRQ_TYPE_LEVEL_LOW:
	levelsense = 1;
	break;

	default:
	printk(KERN_ERR "bogus flow type combination given !\n");
	return -EINVAL;
	}

	regaddr = get_ext_irq_perf_reg(irq);
	reg = bcm_perf_readl(regaddr);
	irq %= 4;

	switch (bcm63xx_get_cpu_id()) {
	case BCM6348_CPU_ID:
	if (levelsense)
	reg \|= EXTIRQ_CFG_LEVELSENSE_6348(irq);
	else
	reg &= ~EXTIRQ_CFG_LEVELSENSE_6348(irq);
	if (sense)
	reg \|= EXTIRQ_CFG_SENSE_6348(irq);
	else
	reg &= ~EXTIRQ_CFG_SENSE_6348(irq);
	if (bothedge)
	reg \|= EXTIRQ_CFG_BOTHEDGE_6348(irq);
	else
	reg &= ~EXTIRQ_CFG_BOTHEDGE_6348(irq);
	break;

	case BCM3368_CPU_ID:
	case BCM6328_CPU_ID:
	case BCM6338_CPU_ID:
	case BCM6345_CPU_ID:
	case BCM6358_CPU_ID:
	case BCM6362_CPU_ID:
	case BCM6368_CPU_ID:
	if (levelsense)
	reg \|= EXTIRQ_CFG_LEVELSENSE(irq);
	else
	reg &= ~EXTIRQ_CFG_LEVELSENSE(irq);
	if (sense)
	reg \|= EXTIRQ_CFG_SENSE(irq);
	else
	reg &= ~EXTIRQ_CFG_SENSE(irq);
	if (bothedge)
	reg \|= EXTIRQ_CFG_BOTHEDGE(irq);
	else
	reg &= ~EXTIRQ_CFG_BOTHEDGE(irq);
	break;
	default:
	BUG();
	}

	bcm_perf_writel(reg, regaddr);

	irqd_set_trigger_type(d, flow_type);
	if (flow_type & (IRQ_TYPE_LEVEL_LOW \| IRQ_TYPE_LEVEL_HIGH))
	__irq_set_handler_locked(d->irq, handle_level_irq);
	else
	__irq_set_handler_locked(d->irq, handle_edge_irq);

	return IRQ_SET_MASK_OK_NOCOPY;
	}

	static struct irq_chip bcm63xx_internal_irq_chip = {
	.name = "bcm63xx_ipic",
	.irq_mask = bcm63xx_internal_irq_mask,
	.irq_unmask = bcm63xx_internal_irq_unmask,
	};

	static struct irq_chip bcm63xx_external_irq_chip = {
	.name = "bcm63xx_epic",
	.irq_ack = bcm63xx_external_irq_clear,

	.irq_mask = bcm63xx_external_irq_mask,
	.irq_unmask = bcm63xx_external_irq_unmask,

	.irq_set_type = bcm63xx_external_irq_set_type,
	};

	static struct irqaction cpu_ip2_cascade_action = {
	.handler = no_action,
	.name = "cascade_ip2",
	.flags = IRQF_NO_THREAD,
	};

	static struct irqaction cpu_ext_cascade_action = {
	.handler = no_action,
	.name = "cascade_extirq",
	.flags = IRQF_NO_THREAD,
	};

	void __init arch_init_irq(void)
	{
	int i;

	bcm63xx_init_irq();
	mips_cpu_irq_init();
	for (i = IRQ_INTERNAL_BASE; i < NR_IRQS; ++i)
	irq_set_chip_and_handler(i, &bcm63xx_internal_irq_chip,
	handle_level_irq);

	for (i = IRQ_EXTERNAL_BASE; i < IRQ_EXTERNAL_BASE + ext_irq_count; ++i)
	irq_set_chip_and_handler(i, &bcm63xx_external_irq_chip,
	handle_edge_irq);

	if (!is_ext_irq_cascaded) {
	for (i = 3; i < 3 + ext_irq_count; ++i)
	setup_irq(MIPS_CPU_IRQ_BASE + i, &cpu_ext_cascade_action);
	}

	setup_irq(MIPS_CPU_IRQ_BASE + 2, &cpu_ip2_cascade_action);
	}