/*
* linux/kernel/irq/manage.c
*
- * Copyright (C) 1992, 1998-2004 Linus Torvalds, Ingo Molnar
+ * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar
+ * Copyright (C) 2005-2006 Thomas Gleixner
*
* 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>
}
EXPORT_SYMBOL(synchronize_irq);
+/**
+ * irq_can_set_affinity - Check if the affinity of a given irq can be set
+ * @irq: Interrupt to check
+ *
+ */
+int irq_can_set_affinity(unsigned int irq)
+{
+ struct irq_desc *desc = irq_desc + irq;
+
+ if (CHECK_IRQ_PER_CPU(desc->status) || !desc->chip ||
+ !desc->chip->set_affinity)
+ return 0;
+
+ return 1;
+}
+
+/**
+ * irq_set_affinity - Set the irq affinity of a given irq
+ * @irq: Interrupt to set affinity
+ * @cpumask: cpumask
+ *
+ */
+int irq_set_affinity(unsigned int irq, cpumask_t cpumask)
+{
+ struct irq_desc *desc = irq_desc + irq;
+
+ if (!desc->chip->set_affinity)
+ return -EINVAL;
+
+ set_balance_irq_affinity(irq, cpumask);
+
+#ifdef CONFIG_GENERIC_PENDING_IRQ
+ set_pending_irq(irq, cpumask);
+#else
+ desc->affinity = cpumask;
+ desc->chip->set_affinity(irq, cpumask);
+#endif
+ return 0;
+}
+
#endif
/**
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;
- desc->status = status;
- if ((status & (IRQ_PENDING | IRQ_REPLAY)) == IRQ_PENDING) {
- desc->status = status | IRQ_REPLAY;
- hw_resend_irq(desc->chip,irq);
- }
- desc->chip->enable(irq);
+ /* Prevent probing on this irq: */
+ desc->status = status | IRQ_NOPROBE;
+ check_irq_resend(desc, irq);
/* fall-through */
}
default:
}
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);
+
/*
* Internal function that tells the architecture code whether a
* particular irq has been exclusively allocated or is available
{
struct irqaction *action;
- if (irq >= NR_IRQS)
+ if (irq >= NR_IRQS || irq_desc[irq].status & IRQ_NOREQUEST)
return 0;
action = irq_desc[irq].action;
if (action)
- if (irqflags & action->flags & SA_SHIRQ)
+ if (irqflags & action->flags & IRQF_SHARED)
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.
{
struct irq_desc *desc = irq_desc + irq;
struct irqaction *old, **p;
+ const char *old_name = NULL;
unsigned long flags;
int shared = 0;
if (irq >= NR_IRQS)
return -EINVAL;
- if (desc->chip == &no_irq_type)
+ if (desc->chip == &no_irq_chip)
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 & SA_SAMPLE_RANDOM) {
+ if (new->flags & IRQF_SAMPLE_RANDOM) {
/*
* This function might sleep, we want to call it first,
* outside of the atomic block.
p = &desc->action;
old = *p;
if (old) {
- /* Can't share interrupts unless both agree to */
- if (!(old->flags & new->flags & SA_SHIRQ))
+ /*
+ * 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)) {
+ old_name = old->name;
goto mismatch;
+ }
-#if defined(CONFIG_IRQ_PER_CPU) && defined(SA_PERCPU_IRQ)
+#if defined(CONFIG_IRQ_PER_CPU)
/* All handlers must agree on per-cpuness */
- if ((old->flags & IRQ_PER_CPU) != (new->flags & IRQ_PER_CPU))
+ if ((old->flags & IRQF_PERCPU) !=
+ (new->flags & IRQF_PERCPU))
goto mismatch;
#endif
}
*p = new;
-#if defined(CONFIG_IRQ_PER_CPU) && defined(SA_PERCPU_IRQ)
- if (new->flags & SA_PERCPU_IRQ)
+#if defined(CONFIG_IRQ_PER_CPU)
+ if (new->flags & IRQF_PERCPU)
desc->status |= IRQ_PER_CPU;
#endif
+ /* Exclude IRQ from balancing */
+ if (new->flags & IRQF_NOBALANCING)
+ desc->status |= IRQ_NO_BALANCING;
+
if (!shared) {
- desc->depth = 0;
- desc->status &= ~(IRQ_DISABLED | IRQ_AUTODETECT |
- IRQ_WAITING | IRQ_INPROGRESS);
- if (desc->chip->startup)
- desc->chip->startup(irq);
- else
- desc->chip->enable(irq);
+ 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;
}
+ /* Reset broken irq detection when installing new handler */
+ desc->irq_count = 0;
+ desc->irqs_unhandled = 0;
spin_unlock_irqrestore(&desc->lock, flags);
new->irq = irq;
return 0;
mismatch:
- spin_unlock_irqrestore(&desc->lock, flags);
- if (!(new->flags & SA_PROBEIRQ)) {
- printk(KERN_ERR "%s: irq handler mismatch\n", __FUNCTION__);
+#ifdef CONFIG_DEBUG_SHIRQ
+ if (!(new->flags & IRQF_PROBE_SHARED)) {
+ printk(KERN_ERR "IRQ handler type mismatch for IRQ %d\n", irq);
+ if (old_name)
+ printk(KERN_ERR "current handler: %s\n", old_name);
dump_stack();
}
+#endif
+ spin_unlock_irqrestore(&desc->lock, flags);
return -EBUSY;
}
struct irq_desc *desc;
struct irqaction **p;
unsigned long flags;
+ irqreturn_t (*handler)(int, void *) = NULL;
WARN_ON(in_interrupt());
if (irq >= NR_IRQS)
/* Make sure it's not being used on another CPU */
synchronize_irq(irq);
+ if (action->flags & IRQF_SHARED)
+ handler = action->handler;
kfree(action);
return;
}
- printk(KERN_ERR "Trying to free free IRQ%d\n", irq);
+ printk(KERN_ERR "Trying to free already-free IRQ %d\n", irq);
spin_unlock_irqrestore(&desc->lock, flags);
return;
}
+#ifdef CONFIG_DEBUG_SHIRQ
+ if (handler) {
+ /*
+ * It's a shared IRQ -- the driver ought to be prepared for it
+ * to happen even now it's being freed, so let's make sure....
+ * We do this after actually deregistering it, to make sure that
+ * a 'real' IRQ doesn't run in parallel with our fake
+ */
+ handler(irq, dev_id);
+ }
+#endif
}
EXPORT_SYMBOL(free_irq);
*
* Flags:
*
- * SA_SHIRQ Interrupt is shared
- * SA_INTERRUPT Disable local interrupts while processing
- * SA_SAMPLE_RANDOM The interrupt can be used for entropy
+ * IRQF_SHARED Interrupt is shared
+ * IRQF_DISABLED Disable local interrupts while processing
+ * IRQF_SAMPLE_RANDOM The interrupt can be used for entropy
*
*/
-int request_irq(unsigned int irq,
- irqreturn_t (*handler)(int, void *, struct pt_regs *),
+int request_irq(unsigned int irq, irq_handler_t handler,
unsigned long irqflags, const char *devname, void *dev_id)
{
struct irqaction *action;
int retval;
+#ifdef CONFIG_LOCKDEP
+ /*
+ * Lockdep wants atomic interrupt handlers:
+ */
+ irqflags |= IRQF_DISABLED;
+#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 & SA_SHIRQ) && !dev_id)
+ if ((irqflags & IRQF_SHARED) && !dev_id)
return -EINVAL;
if (irq >= NR_IRQS)
return -EINVAL;
+ if (irq_desc[irq].status & IRQ_NOREQUEST)
+ return -EINVAL;
if (!handler)
return -EINVAL;
select_smp_affinity(irq);
+#ifdef CONFIG_DEBUG_SHIRQ
+ if (irqflags & IRQF_SHARED) {
+ /*
+ * It's a shared IRQ -- the driver ought to be prepared for it
+ * to happen immediately, so let's make sure....
+ * We do this before actually registering it, to make sure that
+ * a 'real' IRQ doesn't run in parallel with our fake
+ */
+ if (irqflags & IRQF_DISABLED) {
+ unsigned long flags;
+
+ local_irq_save(flags);
+ handler(irq, dev_id);
+ local_irq_restore(flags);
+ } else
+ handler(irq, dev_id);
+ }
+#endif
+
retval = setup_irq(irq, action);
if (retval)
kfree(action);
return retval;
}
EXPORT_SYMBOL(request_irq);
-
projects / powerpc.git / blobdiff