<commit_before>/*
 * linux/kernel/irq/chip.c
 *
 * Copyright (C) 1992, 1998-2006 <NAME>, <NAME>
 * Copyright (C) 2005-2006, <NAME>, <NAME>
 *
 * This file contains the core interrupt handling code, for irq-chip
 * based architectures.
 *
 * Detailed information is available in Documentation/DocBook/genericirq
 */

#include <linux/irq.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/kernel_stat.h>

#include "internals.h"

/**
 *	dynamic_irq_init - initialize a dynamically allocated irq
 *	@irq:	irq number to initialize
 */
void dynamic_irq_init(unsigned int irq)
{
	struct irq_desc *desc;
	unsigned long flags;

	if (irq >= NR_IRQS) {
		printk(KERN_ERR "Trying to initialize invalid IRQ%d\n", irq);
		WARN_ON(1);
		return;
	}

	/* Ensure we don't have left over values from a previous use of this irq */
	desc = irq_desc + irq;
	spin_lock_irqsave(&desc->lock, flags);
	desc->status = IRQ_DISABLED;
	desc->chip = &no_irq_chip;
	desc->handle_irq = handle_bad_irq;
	desc->depth = 1;
	desc->handler_data = NULL;
	desc->chip_data = NULL;
	desc->action = NULL;
	desc->irq_count = 0;
	desc->irqs_unhandled = 0;
#ifdef CONFIG_SMP
	desc->affinity = CPU_MASK_ALL;
#endif
	spin_unlock_irqrestore(&desc->lock, flags);
}

/**
 *	dynamic_irq_cleanup - cleanup a dynamically allocated irq
 *	@irq:	irq number to initialize
 */
void dynamic_irq_cleanup(unsigned int irq)
{
	struct irq_desc *desc;
	unsigned long flags;

	if (irq >= NR_IRQS) {
		printk(KERN_ERR "Trying to cleanup invalid IRQ%d\n", irq);
		WARN_ON(1);
		return;
	}

	desc = irq_desc + irq;
	spin_lock_irqsave(&desc->lock, flags);
	if (desc->action) {
		spin_unlock_irqrestore(&desc->lock, flags);
		printk(KERN_ERR "Destroying IRQ%d without calling free_irq\n",
			irq);
		WARN_ON(1);
		return;
	}
	desc->handle_irq = handle_bad_irq;
	desc->chip = &no_irq_chip;
	spin_unlock_irqrestore(&desc->lock, flags);
}


/**
 *	set_irq_chip - set the irq chip for an irq
 *	@irq:	irq number
 *	@chip:	pointer to irq chip description structure
 */
int set_irq_chip(unsigned int irq, struct irq_chip *chip)
{
	struct irq_desc *desc;
	unsigned long flags;

	if (irq >= NR_IRQS) {
		printk(KERN_ERR "Trying to install chip for IRQ%d\n", irq);
		WARN_ON(1);
		return -EINVAL;
	}

	if (!chip)
		chip = &no_irq_chip;

	desc = irq_desc + irq;
	spin_lock_irqsave(&desc->lock, flags);
	irq_chip_set_defaults(chip);
	desc->chip = chip;
	spin_unlock_irqrestore(&desc->lock, flags);

	return 0;
}
EXPORT_SYMBOL(set_irq_chip);

/**
 *	set_irq_type - set the irq type for an irq
 *	@irq:	irq number
 *	@type:	interrupt type - see include/linux/interrupt.h
 */
int set_irq_type(unsigned int irq, unsigned int type)
{
	struct irq_desc *desc;
	unsigned long flags;
	int ret = -ENXIO;

	if (irq >= NR_IRQS) {
		printk(KERN_ERR "Trying to set irq type for IRQ%d\n", irq);
		return -ENODEV;
	}

	desc = irq_desc + irq;
	if (desc->chip->set_type) {
		spin_lock_irqsave(&desc->lock, flags);
		ret = desc->chip->set_type(irq, type);
		spin_unlock_irqrestore(&desc->lock, flags);
	}
	return ret;
}
EXPORT_SYMBOL(set_irq_type);

/**
 *	set_irq_data - set irq type data for an irq
 *	@irq:	Interrupt number
 *	@data:	Pointer to interrupt specific data
 *
 *	Set the hardware irq controller data for an irq
 */
int set_irq_data(unsigned int irq, void *data)
{
	struct irq_desc *desc;
	unsigned long flags;

	if (irq >= NR_IRQS) {
		printk(KERN_ERR
		       "Trying to install controller data for IRQ%d\n", irq);
		return -EINVAL;
	}

	desc = irq_desc + irq;
	spin_lock_irqsave(&desc->lock, flags);
	desc->handler_data = data;
	spin_unlock_irqrestore(&desc->lock, flags);
	return 0;
}
EXPORT_SYMBOL(set_irq_data);

/**
 *	set_irq_chip_data - set irq chip data for an irq
 *	@irq:	Interrupt number
 *	@data:	Pointer to chip specific data
 *
 *	Set the hardware irq chip data for an irq
 */
int set_irq_chip_data(unsigned int irq, void *data)
{
	struct irq_desc *desc = irq_desc + irq;
	unsigned long flags;

	if (irq >= NR_IRQS || !desc->chip) {
		printk(KERN_ERR "BUG: bad set_irq_chip_data(IRQ#%d)\n", irq);
		return -EINVAL;
	}

	spin_lock_irqsave(&desc->lock, flags);
	desc->chip_data = data;
	spin_unlock_irqrestore(&desc->lock, flags);

	return 0;
}
EXPORT_SYMBOL(set_irq_chip_data);

/*
 * default enable function
 */
static void default_enable(unsigned int irq)
{
	struct irq_desc *desc = irq_desc + irq;

	desc->chip->unmask(irq);
	desc->status &= ~IRQ_MASKED;
}

/*
 * default disable function
 */
static void default_disable(unsigned int irq)
{
	struct irq_desc *desc = irq_desc + irq;

	if (!(desc->status & IRQ_DELAYED_DISABLE))
		desc->chip->mask(irq);
}

/*
 * default startup function
 */
static unsigned int default_startup(unsigned int irq)
{
	irq_desc[irq].chip->enable(irq);

	return 0;
}

/*
 * Fixup enable/disable function pointers
 */
void irq_chip_set_defaults(struct irq_chip *chip)
{
	if (!chip->enable)
		chip->enable = default_enable;
	if (!chip->disable)
		chip->disable = default_disable;
	if (!chip->startup)
		chip->startup = default_startup;
	if (!chip->shutdown)
		chip->shutdown = chip->disable;
	if (!chip->name)
		chip->name = chip->typename;
}

static inline void mask_ack_irq(struct irq_desc *desc, int irq)
{
	if (desc->chip->mask_ack)
		desc->chip->mask_ack(irq);
	else {
		desc->chip->mask(irq);
		desc->chip->ack(irq);
	}
}

/**
 *	handle_simple_irq - Simple and software-decoded IRQs.
 *	@irq:	the interrupt number
 *	@desc:	the interrupt description structure for this irq
 *
 *	Simple interrupts are either sent from a demultiplexing interrupt
 *	handler or come from hardware, where no interrupt hardware control
 *	is necessary.
 *
 *	Note: The caller is expected to handle the ack, clear, mask and
 *	unmask issues if necessary.<commit_msg>[PATCH] some irq_chip variables point to NULL<commit_after>/*
 * linux/kernel/irq/chip.c
 *
 * Copyright (C) 1992, 1998-2006 <NAME>, <NAME>
 * Copyright (C) 2005-2006, <NAME>, <NAME>
 *
 * This file contains the core interrupt handling code, for irq-chip
 * based architectures.
 *
 * Detailed information is available in Documentation/DocBook/genericirq
 */

#include <linux/irq.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/kernel_stat.h>

#include "internals.h"

/**
 *	dynamic_irq_init - initialize a dynamically allocated irq
 *	@irq:	irq number to initialize
 */
void dynamic_irq_init(unsigned int irq)
{
	struct irq_desc *desc;
	unsigned long flags;

	if (irq >= NR_IRQS) {
		printk(KERN_ERR "Trying to initialize invalid IRQ%d\n", irq);
		WARN_ON(1);
		return;
	}

	/* Ensure we don't have left over values from a previous use of this irq */
	desc = irq_desc + irq;
	spin_lock_irqsave(&desc->lock, flags);
	desc->status = IRQ_DISABLED;
	desc->chip = &no_irq_chip;
	desc->handle_irq = handle_bad_irq;
	desc->depth = 1;
	desc->handler_data = NULL;
	desc->chip_data = NULL;
	desc->action = NULL;
	desc->irq_count = 0;
	desc->irqs_unhandled = 0;
#ifdef CONFIG_SMP
	desc->affinity = CPU_MASK_ALL;
#endif
	spin_unlock_irqrestore(&desc->lock, flags);
}

/**
 *	dynamic_irq_cleanup - cleanup a dynamically allocated irq
 *	@irq:	irq number to initialize
 */
void dynamic_irq_cleanup(unsigned int irq)
{
	struct irq_desc *desc;
	unsigned long flags;

	if (irq >= NR_IRQS) {
		printk(KERN_ERR "Trying to cleanup invalid IRQ%d\n", irq);
		WARN_ON(1);
		return;
	}

	desc = irq_desc + irq;
	spin_lock_irqsave(&desc->lock, flags);
	if (desc->action) {
		spin_unlock_irqrestore(&desc->lock, flags);
		printk(KERN_ERR "Destroying IRQ%d without calling free_irq\n",
			irq);
		WARN_ON(1);
		return;
	}
	desc->handle_irq = handle_bad_irq;
	desc->chip = &no_irq_chip;
	spin_unlock_irqrestore(&desc->lock, flags);
}


/**
 *	set_irq_chip - set the irq chip for an irq
 *	@irq:	irq number
 *	@chip:	pointer to irq chip description structure
 */
int set_irq_chip(unsigned int irq, struct irq_chip *chip)
{
	struct irq_desc *desc;
	unsigned long flags;

	if (irq >= NR_IRQS) {
		printk(KERN_ERR "Trying to install chip for IRQ%d\n", irq);
		WARN_ON(1);
		return -EINVAL;
	}

	if (!chip)
		chip = &no_irq_chip;

	desc = irq_desc + irq;
	spin_lock_irqsave(&desc->lock, flags);
	irq_chip_set_defaults(chip);
	desc->chip = chip;
	spin_unlock_irqrestore(&desc->lock, flags);

	return 0;
}
EXPORT_SYMBOL(set_irq_chip);

/**
 *	set_irq_type - set the irq type for an irq
 *	@irq:	irq number
 *	@type:	interrupt type - see include/linux/interrupt.h
 */
int set_irq_type(unsigned int irq, unsigned int type)
{
	struct irq_desc *desc;
	unsigned long flags;
	int ret = -ENXIO;

	if (irq >= NR_IRQS) {
		printk(KERN_ERR "Trying to set irq type for IRQ%d\n", irq);
		return -ENODEV;
	}

	desc = irq_desc + irq;
	if (desc->chip->set_type) {
		spin_lock_irqsave(&desc->lock, flags);
		ret = desc->chip->set_type(irq, type);
		spin_unlock_irqrestore(&desc->lock, flags);
	}
	return ret;
}
EXPORT_SYMBOL(set_irq_type);

/**
 *	set_irq_data - set irq type data for an irq
 *	@irq:	Interrupt number
 *	@data:	Pointer to interrupt specific data
 *
 *	Set the hardware irq controller data for an irq
 */
int set_irq_data(unsigned int irq, void *data)
{
	struct irq_desc *desc;
	unsigned long flags;

	if (irq >= NR_IRQS) {
		printk(KERN_ERR
		       "Trying to install controller data for IRQ%d\n", irq);
		return -EINVAL;
	}

	desc = irq_desc + irq;
	spin_lock_irqsave(&desc->lock, flags);
	desc->handler_data = data;
	spin_unlock_irqrestore(&desc->lock, flags);
	return 0;
}
EXPORT_SYMBOL(set_irq_data);

/**
 *	set_irq_chip_data - set irq chip data for an irq
 *	@irq:	Interrupt number
 *	@data:	Pointer to chip specific data
 *
 *	Set the hardware irq chip data for an irq
 */
int set_irq_chip_data(unsigned int irq, void *data)
{
	struct irq_desc *desc = irq_desc + irq;
	unsigned long flags;

	if (irq >= NR_IRQS || !desc->chip) {
		printk(KERN_ERR "BUG: bad set_irq_chip_data(IRQ#%d)\n", irq);
		return -EINVAL;
	}

	spin_lock_irqsave(&desc->lock, flags);
	desc->chip_data = data;
	spin_unlock_irqrestore(&desc->lock, flags);

	return 0;
}
EXPORT_SYMBOL(set_irq_chip_data);

/*
 * default enable function
 */
static void default_enable(unsigned int irq)
{
	struct irq_desc *desc = irq_desc + irq;

	desc->chip->unmask(irq);
	desc->status &= ~IRQ_MASKED;
}

/*
 * default disable function
 */
static void default_disable(unsigned int irq)
{
	struct irq_desc *desc = irq_desc + irq;

	if (!(desc->status & IRQ_DELAYED_DISABLE))
		desc->chip->mask(irq);
}

/*
 * default startup function
 */
static unsigned int default_startup(unsigned int irq)
{
	irq_desc[irq].chip->enable(irq);

	return 0;
}

/*
 * Fixup enable/disable function pointers
 */
void irq_chip_set_defaults(struct irq_chip *chip)
{
	if (!chip->enable)
		chip->enable = default_enable;
	if (!chip->disable)
		chip->disable = default_disable;
	if (!chip->startup)
		chip->startup = default_startup;
	if (!chip->shutdown)
		chip->shutdown = chip->disable;
	if (!chip->name)
		chip->name = chip->typename;
	if (!chip->end)
		chip->end = dummy_irq_chip.end;
}

static inline void mask_ack_irq(struct irq_desc *desc, int irq)
{
	if (desc->chip->mask_ack)
		desc->chip->mask_ack(irq);
	else {
		desc->chip->mask(irq);
		desc->chip->ack(irq);
	}
}

/**
 *	handle_simple_irq - Simple and software-decoded IRQs.
 *	@irq:	the interrupt number
 *	@desc:	the interrupt description structure for this irq
 *
 *	Simple interrupts are either sent from a demultiplexing interrupt
 *	handler or come from hardware, where no interrupt hardware control
 *	is necessary.
 *
 *	Note: The caller is expected to handle the ack, clear, mask and
 *	unmask issues if necessary.
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