/*
* linux/kernel/irq/manage.c
*
- * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar
- * Copyright (C) 2005-2006 Thomas Gleixner
+ * Copyright (C) 1992, 1998-2004 Linus Torvalds, Ingo Molnar
*
* This file contains driver APIs to the irq subsystem.
*/
+#include <linux/config.h>
#include <linux/irq.h>
#include <linux/module.h>
#include <linux/random.h>
#ifdef CONFIG_SMP
+cpumask_t irq_affinity[NR_IRQS] = { [0 ... NR_IRQS-1] = CPU_MASK_ALL };
+
+#if defined (CONFIG_GENERIC_PENDING_IRQ) || defined (CONFIG_IRQBALANCE)
+cpumask_t __cacheline_aligned pending_irq_cpumask[NR_IRQS];
+#endif
+
/**
* synchronize_irq - wait for pending IRQ handlers (on other CPUs)
* @irq: interrupt number to wait for
while (desc->status & IRQ_INPROGRESS)
cpu_relax();
}
+
EXPORT_SYMBOL(synchronize_irq);
#endif
*/
void disable_irq_nosync(unsigned int irq)
{
- struct irq_desc *desc = irq_desc + irq;
+ irq_desc_t *desc = irq_desc + irq;
unsigned long flags;
if (irq >= NR_IRQS)
spin_lock_irqsave(&desc->lock, flags);
if (!desc->depth++) {
desc->status |= IRQ_DISABLED;
- desc->chip->disable(irq);
+ desc->handler->disable(irq);
}
spin_unlock_irqrestore(&desc->lock, flags);
}
+
EXPORT_SYMBOL(disable_irq_nosync);
/**
*/
void disable_irq(unsigned int irq)
{
- struct irq_desc *desc = irq_desc + irq;
+ irq_desc_t *desc = irq_desc + irq;
if (irq >= NR_IRQS)
return;
if (desc->action)
synchronize_irq(irq);
}
+
EXPORT_SYMBOL(disable_irq);
/**
*/
void enable_irq(unsigned int irq)
{
- struct irq_desc *desc = irq_desc + irq;
+ irq_desc_t *desc = irq_desc + irq;
unsigned long flags;
if (irq >= NR_IRQS)
spin_lock_irqsave(&desc->lock, flags);
switch (desc->depth) {
case 0:
- printk(KERN_WARNING "Unbalanced enable for IRQ %d\n", irq);
WARN_ON(1);
break;
case 1: {
unsigned int status = desc->status & ~IRQ_DISABLED;
- /* Prevent probing on this irq: */
- desc->status = status | IRQ_NOPROBE;
- check_irq_resend(desc, irq);
+ desc->status = status;
+ if ((status & (IRQ_PENDING | IRQ_REPLAY)) == IRQ_PENDING) {
+ desc->status = status | IRQ_REPLAY;
+ hw_resend_irq(desc->handler,irq);
+ }
+ desc->handler->enable(irq);
/* fall-through */
}
default:
}
spin_unlock_irqrestore(&desc->lock, flags);
}
-EXPORT_SYMBOL(enable_irq);
-/**
- * set_irq_wake - control irq power management wakeup
- * @irq: interrupt to control
- * @on: enable/disable power management wakeup
- *
- * Enable/disable power management wakeup mode, which is
- * disabled by default. Enables and disables must match,
- * just as they match for non-wakeup mode support.
- *
- * Wakeup mode lets this IRQ wake the system from sleep
- * states like "suspend to RAM".
- */
-int set_irq_wake(unsigned int irq, unsigned int on)
-{
- struct irq_desc *desc = irq_desc + irq;
- unsigned long flags;
- int ret = -ENXIO;
- int (*set_wake)(unsigned, unsigned) = desc->chip->set_wake;
-
- /* wakeup-capable irqs can be shared between drivers that
- * don't need to have the same sleep mode behaviors.
- */
- spin_lock_irqsave(&desc->lock, flags);
- if (on) {
- if (desc->wake_depth++ == 0)
- desc->status |= IRQ_WAKEUP;
- else
- set_wake = NULL;
- } else {
- if (desc->wake_depth == 0) {
- printk(KERN_WARNING "Unbalanced IRQ %d "
- "wake disable\n", irq);
- WARN_ON(1);
- } else if (--desc->wake_depth == 0)
- desc->status &= ~IRQ_WAKEUP;
- else
- set_wake = NULL;
- }
- if (set_wake)
- ret = desc->chip->set_wake(irq, on);
- spin_unlock_irqrestore(&desc->lock, flags);
- return ret;
-}
-EXPORT_SYMBOL(set_irq_wake);
+EXPORT_SYMBOL(enable_irq);
/*
* Internal function that tells the architecture code whether a
{
struct irqaction *action;
- if (irq >= NR_IRQS || irq_desc[irq].status & IRQ_NOREQUEST)
+ if (irq >= NR_IRQS)
return 0;
action = irq_desc[irq].action;
if (action)
- if (irqflags & action->flags & IRQF_SHARED)
+ if (irqflags & action->flags & SA_SHIRQ)
action = NULL;
return !action;
}
-void compat_irq_chip_set_default_handler(struct irq_desc *desc)
-{
- /*
- * If the architecture still has not overriden
- * the flow handler then zap the default. This
- * should catch incorrect flow-type setting.
- */
- if (desc->handle_irq == &handle_bad_irq)
- desc->handle_irq = NULL;
-}
-
/*
* Internal function to register an irqaction - typically used to
* allocate special interrupts that are part of the architecture.
*/
-int setup_irq(unsigned int irq, struct irqaction *new)
+int setup_irq(unsigned int irq, struct irqaction * new)
{
struct irq_desc *desc = irq_desc + irq;
struct irqaction *old, **p;
if (irq >= NR_IRQS)
return -EINVAL;
- if (desc->chip == &no_irq_chip)
+ if (desc->handler == &no_irq_type)
return -ENOSYS;
/*
* Some drivers like serial.c use request_irq() heavily,
* so we have to be careful not to interfere with a
* running system.
*/
- if (new->flags & IRQF_SAMPLE_RANDOM) {
+ if (new->flags & SA_SAMPLE_RANDOM) {
/*
* This function might sleep, we want to call it first,
* outside of the atomic block.
/*
* The following block of code has to be executed atomically
*/
- spin_lock_irqsave(&desc->lock, flags);
+ spin_lock_irqsave(&desc->lock,flags);
p = &desc->action;
- old = *p;
- if (old) {
- /*
- * Can't share interrupts unless both agree to and are
- * the same type (level, edge, polarity). So both flag
- * fields must have IRQF_SHARED set and the bits which
- * set the trigger type must match.
- */
- if (!((old->flags & new->flags) & IRQF_SHARED) ||
- ((old->flags ^ new->flags) & IRQF_TRIGGER_MASK))
- goto mismatch;
-
-#if defined(CONFIG_IRQ_PER_CPU)
- /* All handlers must agree on per-cpuness */
- if ((old->flags & IRQF_PERCPU) !=
- (new->flags & IRQF_PERCPU))
- goto mismatch;
-#endif
+ if ((old = *p) != NULL) {
+ /* Can't share interrupts unless both agree to */
+ if (!(old->flags & new->flags & SA_SHIRQ)) {
+ spin_unlock_irqrestore(&desc->lock,flags);
+ return -EBUSY;
+ }
/* add new interrupt at end of irq queue */
do {
}
*p = new;
-#if defined(CONFIG_IRQ_PER_CPU)
- if (new->flags & IRQF_PERCPU)
- desc->status |= IRQ_PER_CPU;
-#endif
+
if (!shared) {
- irq_chip_set_defaults(desc->chip);
-
- /* Setup the type (level, edge polarity) if configured: */
- if (new->flags & IRQF_TRIGGER_MASK) {
- if (desc->chip && desc->chip->set_type)
- desc->chip->set_type(irq,
- new->flags & IRQF_TRIGGER_MASK);
- else
- /*
- * IRQF_TRIGGER_* but the PIC does not support
- * multiple flow-types?
- */
- printk(KERN_WARNING "No IRQF_TRIGGER set_type "
- "function for IRQ %d (%s)\n", irq,
- desc->chip ? desc->chip->name :
- "unknown");
- } else
- compat_irq_chip_set_default_handler(desc);
-
- desc->status &= ~(IRQ_AUTODETECT | IRQ_WAITING |
- IRQ_INPROGRESS);
-
- if (!(desc->status & IRQ_NOAUTOEN)) {
- desc->depth = 0;
- desc->status &= ~IRQ_DISABLED;
- if (desc->chip->startup)
- desc->chip->startup(irq);
- else
- desc->chip->enable(irq);
- } else
- /* Undo nested disables: */
- desc->depth = 1;
+ desc->depth = 0;
+ desc->status &= ~(IRQ_DISABLED | IRQ_AUTODETECT |
+ IRQ_WAITING | IRQ_INPROGRESS);
+ if (desc->handler->startup)
+ desc->handler->startup(irq);
+ else
+ desc->handler->enable(irq);
}
- spin_unlock_irqrestore(&desc->lock, flags);
+ spin_unlock_irqrestore(&desc->lock,flags);
new->irq = irq;
register_irq_proc(irq);
register_handler_proc(irq, new);
return 0;
-
-mismatch:
- spin_unlock_irqrestore(&desc->lock, flags);
- if (!(new->flags & IRQF_PROBE_SHARED)) {
- printk(KERN_ERR "IRQ handler type mismatch for IRQ %d\n", irq);
- dump_stack();
- }
- return -EBUSY;
}
/**
return;
desc = irq_desc + irq;
- spin_lock_irqsave(&desc->lock, flags);
+ spin_lock_irqsave(&desc->lock,flags);
p = &desc->action;
for (;;) {
- struct irqaction *action = *p;
+ struct irqaction * action = *p;
if (action) {
struct irqaction **pp = p;
/* Currently used only by UML, might disappear one day.*/
#ifdef CONFIG_IRQ_RELEASE_METHOD
- if (desc->chip->release)
- desc->chip->release(irq, dev_id);
+ if (desc->handler->release)
+ desc->handler->release(irq, dev_id);
#endif
if (!desc->action) {
desc->status |= IRQ_DISABLED;
- if (desc->chip->shutdown)
- desc->chip->shutdown(irq);
+ if (desc->handler->shutdown)
+ desc->handler->shutdown(irq);
else
- desc->chip->disable(irq);
+ desc->handler->disable(irq);
}
- spin_unlock_irqrestore(&desc->lock, flags);
+ spin_unlock_irqrestore(&desc->lock,flags);
unregister_handler_proc(irq, action);
/* Make sure it's not being used on another CPU */
kfree(action);
return;
}
- printk(KERN_ERR "Trying to free already-free IRQ %d\n", irq);
- spin_unlock_irqrestore(&desc->lock, flags);
+ printk(KERN_ERR "Trying to free free IRQ%d\n",irq);
+ spin_unlock_irqrestore(&desc->lock,flags);
return;
}
}
+
EXPORT_SYMBOL(free_irq);
/**
*
* Flags:
*
- * IRQF_SHARED Interrupt is shared
- * IRQF_DISABLED Disable local interrupts while processing
- * IRQF_SAMPLE_RANDOM The interrupt can be used for entropy
+ * SA_SHIRQ Interrupt is shared
+ * SA_INTERRUPT Disable local interrupts while processing
+ * SA_SAMPLE_RANDOM The interrupt can be used for entropy
*
*/
int request_irq(unsigned int irq,
irqreturn_t (*handler)(int, void *, struct pt_regs *),
- unsigned long irqflags, const char *devname, void *dev_id)
+ unsigned long irqflags, const char * devname, void *dev_id)
{
- struct irqaction *action;
+ struct irqaction * action;
int retval;
-#ifdef CONFIG_LOCKDEP
- /*
- * Lockdep wants atomic interrupt handlers:
- */
- irqflags |= SA_INTERRUPT;
-#endif
/*
* Sanity-check: shared interrupts must pass in a real dev-ID,
* otherwise we'll have trouble later trying to figure out
* which interrupt is which (messes up the interrupt freeing
* logic etc).
*/
- if ((irqflags & IRQF_SHARED) && !dev_id)
+ if ((irqflags & SA_SHIRQ) && !dev_id)
return -EINVAL;
if (irq >= NR_IRQS)
return -EINVAL;
- if (irq_desc[irq].status & IRQ_NOREQUEST)
- return -EINVAL;
if (!handler)
return -EINVAL;
return retval;
}
+
EXPORT_SYMBOL(request_irq);
git://git.onelab.eu / linux-2.6.git / blobdiff