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b25c340c19
For threaded interrupt handlers we expect the hard interrupt handler part to mask the interrupt on the originating device. The interrupt line itself is reenabled after the hard interrupt handler has executed. This requires access to the originating device from hard interrupt context which is not always possible. There are devices which can only be accessed via a bus (i2c, spi, ...). The bus access requires thread context. For such devices we need to keep the interrupt line masked until the threaded handler has executed. Add a new flag IRQF_ONESHOT which allows drivers to request that the interrupt is not unmasked after the hard interrupt context handler has been executed and the thread has been woken. The interrupt line is unmasked after the thread handler function has been executed. Note that for now IRQF_ONESHOT cannot be used with IRQF_SHARED to avoid complex accounting mechanisms. For oneshot interrupts the primary handler simply returns IRQ_WAKE_THREAD and does nothing else. A generic implementation irq_default_primary_handler() is provided to avoid useless copies all over the place. It is automatically installed when request_threaded_irq() is called with handler=NULL and thread_fn!=NULL. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Mark Brown <broonie@opensource.wolfsonmicro.com> Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com> Cc: Trilok Soni <soni.trilok@gmail.com> Cc: Pavel Machek <pavel@ucw.cz> Cc: Brian Swetland <swetland@google.com> Cc: Joonyoung Shim <jy0922.shim@samsung.com> Cc: m.szyprowski@samsung.com Cc: t.fujak@samsung.com Cc: kyungmin.park@samsung.com, Cc: David Brownell <david-b@pacbell.net> Cc: Daniel Ribeiro <drwyrm@gmail.com> Cc: arve@android.com Cc: Barry Song <21cnbao@gmail.com>
650 lines
15 KiB
C
650 lines
15 KiB
C
/*
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* linux/kernel/irq/chip.c
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*
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* Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar
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* Copyright (C) 2005-2006, Thomas Gleixner, Russell King
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*
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* This file contains the core interrupt handling code, for irq-chip
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* based architectures.
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*
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* Detailed information is available in Documentation/DocBook/genericirq
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*/
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#include <linux/irq.h>
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#include <linux/msi.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/kernel_stat.h>
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#include "internals.h"
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/**
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* dynamic_irq_init - initialize a dynamically allocated irq
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* @irq: irq number to initialize
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*/
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void dynamic_irq_init(unsigned int irq)
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{
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struct irq_desc *desc;
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unsigned long flags;
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desc = irq_to_desc(irq);
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if (!desc) {
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WARN(1, KERN_ERR "Trying to initialize invalid IRQ%d\n", irq);
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return;
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}
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/* Ensure we don't have left over values from a previous use of this irq */
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spin_lock_irqsave(&desc->lock, flags);
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desc->status = IRQ_DISABLED;
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desc->chip = &no_irq_chip;
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desc->handle_irq = handle_bad_irq;
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desc->depth = 1;
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desc->msi_desc = NULL;
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desc->handler_data = NULL;
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desc->chip_data = NULL;
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desc->action = NULL;
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desc->irq_count = 0;
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desc->irqs_unhandled = 0;
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#ifdef CONFIG_SMP
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cpumask_setall(desc->affinity);
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#ifdef CONFIG_GENERIC_PENDING_IRQ
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cpumask_clear(desc->pending_mask);
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#endif
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#endif
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spin_unlock_irqrestore(&desc->lock, flags);
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}
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/**
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* dynamic_irq_cleanup - cleanup a dynamically allocated irq
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* @irq: irq number to initialize
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*/
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void dynamic_irq_cleanup(unsigned int irq)
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{
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struct irq_desc *desc = irq_to_desc(irq);
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unsigned long flags;
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if (!desc) {
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WARN(1, KERN_ERR "Trying to cleanup invalid IRQ%d\n", irq);
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return;
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}
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spin_lock_irqsave(&desc->lock, flags);
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if (desc->action) {
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spin_unlock_irqrestore(&desc->lock, flags);
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WARN(1, KERN_ERR "Destroying IRQ%d without calling free_irq\n",
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irq);
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return;
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}
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desc->msi_desc = NULL;
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desc->handler_data = NULL;
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desc->chip_data = NULL;
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desc->handle_irq = handle_bad_irq;
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desc->chip = &no_irq_chip;
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desc->name = NULL;
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clear_kstat_irqs(desc);
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spin_unlock_irqrestore(&desc->lock, flags);
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}
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/**
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* set_irq_chip - set the irq chip for an irq
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* @irq: irq number
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* @chip: pointer to irq chip description structure
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*/
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int set_irq_chip(unsigned int irq, struct irq_chip *chip)
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{
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struct irq_desc *desc = irq_to_desc(irq);
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unsigned long flags;
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if (!desc) {
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WARN(1, KERN_ERR "Trying to install chip for IRQ%d\n", irq);
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return -EINVAL;
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}
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if (!chip)
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chip = &no_irq_chip;
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spin_lock_irqsave(&desc->lock, flags);
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irq_chip_set_defaults(chip);
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desc->chip = chip;
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spin_unlock_irqrestore(&desc->lock, flags);
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return 0;
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}
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EXPORT_SYMBOL(set_irq_chip);
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/**
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* set_irq_type - set the irq trigger type for an irq
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* @irq: irq number
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* @type: IRQ_TYPE_{LEVEL,EDGE}_* value - see include/linux/irq.h
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*/
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int set_irq_type(unsigned int irq, unsigned int type)
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{
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struct irq_desc *desc = irq_to_desc(irq);
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unsigned long flags;
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int ret = -ENXIO;
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if (!desc) {
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printk(KERN_ERR "Trying to set irq type for IRQ%d\n", irq);
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return -ENODEV;
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}
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type &= IRQ_TYPE_SENSE_MASK;
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if (type == IRQ_TYPE_NONE)
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return 0;
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spin_lock_irqsave(&desc->lock, flags);
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ret = __irq_set_trigger(desc, irq, type);
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spin_unlock_irqrestore(&desc->lock, flags);
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return ret;
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}
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EXPORT_SYMBOL(set_irq_type);
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/**
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* set_irq_data - set irq type data for an irq
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* @irq: Interrupt number
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* @data: Pointer to interrupt specific data
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*
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* Set the hardware irq controller data for an irq
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*/
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int set_irq_data(unsigned int irq, void *data)
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{
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struct irq_desc *desc = irq_to_desc(irq);
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unsigned long flags;
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if (!desc) {
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printk(KERN_ERR
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"Trying to install controller data for IRQ%d\n", irq);
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return -EINVAL;
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}
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spin_lock_irqsave(&desc->lock, flags);
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desc->handler_data = data;
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spin_unlock_irqrestore(&desc->lock, flags);
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return 0;
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}
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EXPORT_SYMBOL(set_irq_data);
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/**
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* set_irq_data - set irq type data for an irq
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* @irq: Interrupt number
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* @entry: Pointer to MSI descriptor data
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*
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* Set the hardware irq controller data for an irq
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*/
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int set_irq_msi(unsigned int irq, struct msi_desc *entry)
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{
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struct irq_desc *desc = irq_to_desc(irq);
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unsigned long flags;
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if (!desc) {
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printk(KERN_ERR
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"Trying to install msi data for IRQ%d\n", irq);
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return -EINVAL;
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}
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spin_lock_irqsave(&desc->lock, flags);
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desc->msi_desc = entry;
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if (entry)
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entry->irq = irq;
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spin_unlock_irqrestore(&desc->lock, flags);
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return 0;
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}
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/**
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* set_irq_chip_data - set irq chip data for an irq
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* @irq: Interrupt number
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* @data: Pointer to chip specific data
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*
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* Set the hardware irq chip data for an irq
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*/
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int set_irq_chip_data(unsigned int irq, void *data)
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{
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struct irq_desc *desc = irq_to_desc(irq);
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unsigned long flags;
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if (!desc) {
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printk(KERN_ERR
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"Trying to install chip data for IRQ%d\n", irq);
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return -EINVAL;
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}
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if (!desc->chip) {
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printk(KERN_ERR "BUG: bad set_irq_chip_data(IRQ#%d)\n", irq);
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return -EINVAL;
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}
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spin_lock_irqsave(&desc->lock, flags);
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desc->chip_data = data;
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spin_unlock_irqrestore(&desc->lock, flags);
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return 0;
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}
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EXPORT_SYMBOL(set_irq_chip_data);
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/*
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* default enable function
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*/
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static void default_enable(unsigned int irq)
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{
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struct irq_desc *desc = irq_to_desc(irq);
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desc->chip->unmask(irq);
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desc->status &= ~IRQ_MASKED;
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}
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/*
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* default disable function
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*/
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static void default_disable(unsigned int irq)
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{
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}
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/*
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* default startup function
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*/
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static unsigned int default_startup(unsigned int irq)
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{
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struct irq_desc *desc = irq_to_desc(irq);
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desc->chip->enable(irq);
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return 0;
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}
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/*
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* default shutdown function
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*/
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static void default_shutdown(unsigned int irq)
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{
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struct irq_desc *desc = irq_to_desc(irq);
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desc->chip->mask(irq);
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desc->status |= IRQ_MASKED;
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}
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/*
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* Fixup enable/disable function pointers
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*/
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void irq_chip_set_defaults(struct irq_chip *chip)
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{
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if (!chip->enable)
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chip->enable = default_enable;
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if (!chip->disable)
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chip->disable = default_disable;
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if (!chip->startup)
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chip->startup = default_startup;
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/*
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* We use chip->disable, when the user provided its own. When
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* we have default_disable set for chip->disable, then we need
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* to use default_shutdown, otherwise the irq line is not
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* disabled on free_irq():
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*/
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if (!chip->shutdown)
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chip->shutdown = chip->disable != default_disable ?
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chip->disable : default_shutdown;
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if (!chip->name)
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chip->name = chip->typename;
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if (!chip->end)
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chip->end = dummy_irq_chip.end;
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}
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static inline void mask_ack_irq(struct irq_desc *desc, int irq)
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{
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if (desc->chip->mask_ack)
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desc->chip->mask_ack(irq);
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else {
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desc->chip->mask(irq);
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if (desc->chip->ack)
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desc->chip->ack(irq);
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}
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}
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/**
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* handle_simple_irq - Simple and software-decoded IRQs.
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* @irq: the interrupt number
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* @desc: the interrupt description structure for this irq
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*
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* Simple interrupts are either sent from a demultiplexing interrupt
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* handler or come from hardware, where no interrupt hardware control
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* is necessary.
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*
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* Note: The caller is expected to handle the ack, clear, mask and
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* unmask issues if necessary.
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*/
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void
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handle_simple_irq(unsigned int irq, struct irq_desc *desc)
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{
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struct irqaction *action;
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irqreturn_t action_ret;
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spin_lock(&desc->lock);
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if (unlikely(desc->status & IRQ_INPROGRESS))
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goto out_unlock;
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desc->status &= ~(IRQ_REPLAY | IRQ_WAITING);
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kstat_incr_irqs_this_cpu(irq, desc);
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action = desc->action;
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if (unlikely(!action || (desc->status & IRQ_DISABLED)))
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goto out_unlock;
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desc->status |= IRQ_INPROGRESS;
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spin_unlock(&desc->lock);
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action_ret = handle_IRQ_event(irq, action);
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if (!noirqdebug)
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note_interrupt(irq, desc, action_ret);
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spin_lock(&desc->lock);
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desc->status &= ~IRQ_INPROGRESS;
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out_unlock:
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spin_unlock(&desc->lock);
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}
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/**
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* handle_level_irq - Level type irq handler
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* @irq: the interrupt number
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* @desc: the interrupt description structure for this irq
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*
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* Level type interrupts are active as long as the hardware line has
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* the active level. This may require to mask the interrupt and unmask
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* it after the associated handler has acknowledged the device, so the
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* interrupt line is back to inactive.
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*/
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void
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handle_level_irq(unsigned int irq, struct irq_desc *desc)
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{
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struct irqaction *action;
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irqreturn_t action_ret;
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spin_lock(&desc->lock);
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mask_ack_irq(desc, irq);
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if (unlikely(desc->status & IRQ_INPROGRESS))
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goto out_unlock;
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desc->status &= ~(IRQ_REPLAY | IRQ_WAITING);
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kstat_incr_irqs_this_cpu(irq, desc);
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/*
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* If its disabled or no action available
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* keep it masked and get out of here
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*/
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action = desc->action;
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if (unlikely(!action || (desc->status & IRQ_DISABLED)))
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goto out_unlock;
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desc->status |= IRQ_INPROGRESS;
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spin_unlock(&desc->lock);
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action_ret = handle_IRQ_event(irq, action);
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if (!noirqdebug)
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note_interrupt(irq, desc, action_ret);
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spin_lock(&desc->lock);
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desc->status &= ~IRQ_INPROGRESS;
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if (unlikely(desc->status & IRQ_ONESHOT))
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desc->status |= IRQ_MASKED;
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else if (!(desc->status & IRQ_DISABLED) && desc->chip->unmask)
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desc->chip->unmask(irq);
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out_unlock:
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spin_unlock(&desc->lock);
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}
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EXPORT_SYMBOL_GPL(handle_level_irq);
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/**
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* handle_fasteoi_irq - irq handler for transparent controllers
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* @irq: the interrupt number
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* @desc: the interrupt description structure for this irq
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*
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* Only a single callback will be issued to the chip: an ->eoi()
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* call when the interrupt has been serviced. This enables support
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* for modern forms of interrupt handlers, which handle the flow
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* details in hardware, transparently.
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*/
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void
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handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc)
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{
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struct irqaction *action;
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irqreturn_t action_ret;
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spin_lock(&desc->lock);
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if (unlikely(desc->status & IRQ_INPROGRESS))
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goto out;
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desc->status &= ~(IRQ_REPLAY | IRQ_WAITING);
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kstat_incr_irqs_this_cpu(irq, desc);
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/*
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* If its disabled or no action available
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* then mask it and get out of here:
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*/
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action = desc->action;
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if (unlikely(!action || (desc->status & IRQ_DISABLED))) {
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desc->status |= IRQ_PENDING;
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if (desc->chip->mask)
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desc->chip->mask(irq);
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goto out;
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}
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desc->status |= IRQ_INPROGRESS;
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desc->status &= ~IRQ_PENDING;
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spin_unlock(&desc->lock);
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action_ret = handle_IRQ_event(irq, action);
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if (!noirqdebug)
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note_interrupt(irq, desc, action_ret);
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spin_lock(&desc->lock);
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desc->status &= ~IRQ_INPROGRESS;
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out:
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desc->chip->eoi(irq);
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spin_unlock(&desc->lock);
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}
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/**
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* handle_edge_irq - edge type IRQ handler
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* @irq: the interrupt number
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* @desc: the interrupt description structure for this irq
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*
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* Interrupt occures on the falling and/or rising edge of a hardware
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* signal. The occurence is latched into the irq controller hardware
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* and must be acked in order to be reenabled. After the ack another
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* interrupt can happen on the same source even before the first one
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* is handled by the assosiacted event handler. If this happens it
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* might be necessary to disable (mask) the interrupt depending on the
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* controller hardware. This requires to reenable the interrupt inside
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* of the loop which handles the interrupts which have arrived while
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* the handler was running. If all pending interrupts are handled, the
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* loop is left.
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*/
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void
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handle_edge_irq(unsigned int irq, struct irq_desc *desc)
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{
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spin_lock(&desc->lock);
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desc->status &= ~(IRQ_REPLAY | IRQ_WAITING);
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/*
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* If we're currently running this IRQ, or its disabled,
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* we shouldn't process the IRQ. Mark it pending, handle
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* the necessary masking and go out
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*/
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if (unlikely((desc->status & (IRQ_INPROGRESS | IRQ_DISABLED)) ||
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!desc->action)) {
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desc->status |= (IRQ_PENDING | IRQ_MASKED);
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mask_ack_irq(desc, irq);
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goto out_unlock;
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}
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kstat_incr_irqs_this_cpu(irq, desc);
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/* Start handling the irq */
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if (unlikely(desc->status & IRQ_ONESHOT)) {
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desc->status |= IRQ_MASKED;
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mask_ack_irq(desc, irq);
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} else {
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if (desc->chip->ack)
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desc->chip->ack(irq);
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}
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/* Mark the IRQ currently in progress.*/
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desc->status |= IRQ_INPROGRESS;
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do {
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struct irqaction *action = desc->action;
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irqreturn_t action_ret;
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if (unlikely(!action)) {
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desc->chip->mask(irq);
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goto out_unlock;
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}
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/*
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* When another irq arrived while we were handling
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* one, we could have masked the irq.
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* Renable it, if it was not disabled in meantime.
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*/
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if (unlikely((desc->status &
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(IRQ_PENDING | IRQ_MASKED | IRQ_DISABLED)) ==
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(IRQ_PENDING | IRQ_MASKED))) {
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desc->chip->unmask(irq);
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desc->status &= ~IRQ_MASKED;
|
|
}
|
|
|
|
desc->status &= ~IRQ_PENDING;
|
|
spin_unlock(&desc->lock);
|
|
action_ret = handle_IRQ_event(irq, action);
|
|
if (!noirqdebug)
|
|
note_interrupt(irq, desc, action_ret);
|
|
spin_lock(&desc->lock);
|
|
|
|
} while ((desc->status & (IRQ_PENDING | IRQ_DISABLED)) == IRQ_PENDING);
|
|
|
|
desc->status &= ~IRQ_INPROGRESS;
|
|
out_unlock:
|
|
spin_unlock(&desc->lock);
|
|
}
|
|
|
|
/**
|
|
* handle_percpu_IRQ - Per CPU local irq handler
|
|
* @irq: the interrupt number
|
|
* @desc: the interrupt description structure for this irq
|
|
*
|
|
* Per CPU interrupts on SMP machines without locking requirements
|
|
*/
|
|
void
|
|
handle_percpu_irq(unsigned int irq, struct irq_desc *desc)
|
|
{
|
|
irqreturn_t action_ret;
|
|
|
|
kstat_incr_irqs_this_cpu(irq, desc);
|
|
|
|
if (desc->chip->ack)
|
|
desc->chip->ack(irq);
|
|
|
|
action_ret = handle_IRQ_event(irq, desc->action);
|
|
if (!noirqdebug)
|
|
note_interrupt(irq, desc, action_ret);
|
|
|
|
if (desc->chip->eoi)
|
|
desc->chip->eoi(irq);
|
|
}
|
|
|
|
void
|
|
__set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
|
|
const char *name)
|
|
{
|
|
struct irq_desc *desc = irq_to_desc(irq);
|
|
unsigned long flags;
|
|
|
|
if (!desc) {
|
|
printk(KERN_ERR
|
|
"Trying to install type control for IRQ%d\n", irq);
|
|
return;
|
|
}
|
|
|
|
if (!handle)
|
|
handle = handle_bad_irq;
|
|
else if (desc->chip == &no_irq_chip) {
|
|
printk(KERN_WARNING "Trying to install %sinterrupt handler "
|
|
"for IRQ%d\n", is_chained ? "chained " : "", irq);
|
|
/*
|
|
* Some ARM implementations install a handler for really dumb
|
|
* interrupt hardware without setting an irq_chip. This worked
|
|
* with the ARM no_irq_chip but the check in setup_irq would
|
|
* prevent us to setup the interrupt at all. Switch it to
|
|
* dummy_irq_chip for easy transition.
|
|
*/
|
|
desc->chip = &dummy_irq_chip;
|
|
}
|
|
|
|
spin_lock_irqsave(&desc->lock, flags);
|
|
|
|
/* Uninstall? */
|
|
if (handle == handle_bad_irq) {
|
|
if (desc->chip != &no_irq_chip)
|
|
mask_ack_irq(desc, irq);
|
|
desc->status |= IRQ_DISABLED;
|
|
desc->depth = 1;
|
|
}
|
|
desc->handle_irq = handle;
|
|
desc->name = name;
|
|
|
|
if (handle != handle_bad_irq && is_chained) {
|
|
desc->status &= ~IRQ_DISABLED;
|
|
desc->status |= IRQ_NOREQUEST | IRQ_NOPROBE;
|
|
desc->depth = 0;
|
|
desc->chip->startup(irq);
|
|
}
|
|
spin_unlock_irqrestore(&desc->lock, flags);
|
|
}
|
|
EXPORT_SYMBOL_GPL(__set_irq_handler);
|
|
|
|
void
|
|
set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip,
|
|
irq_flow_handler_t handle)
|
|
{
|
|
set_irq_chip(irq, chip);
|
|
__set_irq_handler(irq, handle, 0, NULL);
|
|
}
|
|
|
|
void
|
|
set_irq_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
|
|
irq_flow_handler_t handle, const char *name)
|
|
{
|
|
set_irq_chip(irq, chip);
|
|
__set_irq_handler(irq, handle, 0, name);
|
|
}
|
|
|
|
void __init set_irq_noprobe(unsigned int irq)
|
|
{
|
|
struct irq_desc *desc = irq_to_desc(irq);
|
|
unsigned long flags;
|
|
|
|
if (!desc) {
|
|
printk(KERN_ERR "Trying to mark IRQ%d non-probeable\n", irq);
|
|
return;
|
|
}
|
|
|
|
spin_lock_irqsave(&desc->lock, flags);
|
|
desc->status |= IRQ_NOPROBE;
|
|
spin_unlock_irqrestore(&desc->lock, flags);
|
|
}
|
|
|
|
void __init set_irq_probe(unsigned int irq)
|
|
{
|
|
struct irq_desc *desc = irq_to_desc(irq);
|
|
unsigned long flags;
|
|
|
|
if (!desc) {
|
|
printk(KERN_ERR "Trying to mark IRQ%d probeable\n", irq);
|
|
return;
|
|
}
|
|
|
|
spin_lock_irqsave(&desc->lock, flags);
|
|
desc->status &= ~IRQ_NOPROBE;
|
|
spin_unlock_irqrestore(&desc->lock, flags);
|
|
}
|