/*
* 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.
*/
#ifdef CONFIG_SMP
-cpumask_t irq_affinity[NR_IRQS] = { [0 ... NR_IRQS-1] = CPU_MASK_ALL };
-
/**
* synchronize_irq - wait for pending IRQ handlers (on other CPUs)
+ * @irq: interrupt number to wait for
*
* This function waits for any pending IRQ handlers for this interrupt
* to complete before returning. If you use this function while
{
struct irq_desc *desc = irq_desc + irq;
+ if (irq >= NR_IRQS)
+ return;
+
while (desc->status & IRQ_INPROGRESS)
cpu_relax();
}
-
EXPORT_SYMBOL(synchronize_irq);
#endif
*/
void disable_irq_nosync(unsigned int irq)
{
- irq_desc_t *desc = irq_desc + irq;
+ struct irq_desc *desc = irq_desc + irq;
unsigned long flags;
+ if (irq >= NR_IRQS)
+ return;
+
spin_lock_irqsave(&desc->lock, flags);
if (!desc->depth++) {
desc->status |= IRQ_DISABLED;
- desc->handler->disable(irq);
+ desc->chip->disable(irq);
}
spin_unlock_irqrestore(&desc->lock, flags);
}
-
EXPORT_SYMBOL(disable_irq_nosync);
/**
*/
void disable_irq(unsigned int irq)
{
- irq_desc_t *desc = irq_desc + irq;
+ struct irq_desc *desc = irq_desc + irq;
+
+ if (irq >= NR_IRQS)
+ return;
disable_irq_nosync(irq);
if (desc->action)
synchronize_irq(irq);
}
-
EXPORT_SYMBOL(disable_irq);
/**
*/
void enable_irq(unsigned int irq)
{
- irq_desc_t *desc = irq_desc + irq;
+ struct irq_desc *desc = irq_desc + irq;
unsigned long flags;
+ if (irq >= NR_IRQS)
+ return;
+
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->handler,irq);
- }
- desc->handler->enable(irq);
+ /* Prevent probing on this irq: */
+ desc->status = status | IRQ_NOPROBE;
+ check_irq_resend(desc, 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);
+
/*
* 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;
}
-/**
- * setup_irq - register an irqaction structure
- * @irq: Interrupt to register
- * @irqaction: The irqaction structure to be registered
- *
- * Normally called by request_irq, this function can be used
- * directly to allocate special interrupts that are part of the
- * architecture.
+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;
+ const char *old_name = NULL;
unsigned long flags;
int shared = 0;
- if (desc->handler == &no_irq_type)
+ if (irq >= NR_IRQS)
+ return -EINVAL;
+
+ 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.
/*
* 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;
- 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;
+ 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)) {
+ old_name = old->name;
+ 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
+
/* add new interrupt at end of irq queue */
do {
p = &old->next;
}
*p = new;
-
+#if defined(CONFIG_IRQ_PER_CPU)
+ if (new->flags & IRQF_PERCPU)
+ desc->status |= IRQ_PER_CPU;
+#endif
if (!shared) {
- 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);
+ 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;
}
- spin_unlock_irqrestore(&desc->lock,flags);
+ /* 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;
register_irq_proc(irq);
register_handler_proc(irq, new);
return 0;
+
+mismatch:
+ 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();
+ }
+ spin_unlock_irqrestore(&desc->lock, flags);
+ return -EBUSY;
}
-/*
- * teardown_irq - unregister an irqaction
- * @irq: Interrupt line being freed
- * @old: Pointer to the irqaction that is to be unregistered
+/**
+ * free_irq - free an interrupt
+ * @irq: Interrupt line to free
+ * @dev_id: Device identity to free
*
- * This function is called by free_irq and does the actual
- * business of unregistering the handler. It exists as a
- * seperate function to enable handlers to be unregistered
- * for irqactions that have been allocated statically at
- * boot time.
+ * Remove an interrupt handler. The handler is removed and if the
+ * interrupt line is no longer in use by any driver it is disabled.
+ * On a shared IRQ the caller must ensure the interrupt is disabled
+ * on the card it drives before calling this function. The function
+ * does not return until any executing interrupts for this IRQ
+ * have completed.
*
* This function must not be called from interrupt context.
*/
-int teardown_irq(unsigned int irq, struct irqaction * old)
+void free_irq(unsigned int irq, void *dev_id)
{
struct irq_desc *desc;
struct irqaction **p;
unsigned long flags;
if (irq >= NR_IRQS)
- return -ENOENT;
+ 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;
p = &action->next;
- if (action != old)
+ if (action->dev_id != dev_id)
continue;
/* Found it - now remove it from the list of entries */
*pp = action->next;
+
+ /* Currently used only by UML, might disappear one day.*/
+#ifdef CONFIG_IRQ_RELEASE_METHOD
+ if (desc->chip->release)
+ desc->chip->release(irq, dev_id);
+#endif
+
if (!desc->action) {
desc->status |= IRQ_DISABLED;
- if (desc->handler->shutdown)
- desc->handler->shutdown(irq);
+ if (desc->chip->shutdown)
+ desc->chip->shutdown(irq);
else
- desc->handler->disable(irq);
+ desc->chip->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 */
synchronize_irq(irq);
- return 0;
- }
- printk(KERN_ERR "Trying to teardown free IRQ%d\n",irq);
- spin_unlock_irqrestore(&desc->lock,flags);
- return -ENOENT;
- }
-}
-
-/**
- * free_irq - free an interrupt
- * @irq: Interrupt line to free
- * @dev_id: Device identity to free
- *
- * Remove an interrupt handler. The handler is removed and if the
- * interrupt line is no longer in use by any driver it is disabled.
- * On a shared IRQ the caller must ensure the interrupt is disabled
- * on the card it drives before calling this function. The function
- * does not return until any executing interrupts for this IRQ
- * have completed.
- *
- * This function must not be called from interrupt context.
- */
-void free_irq(unsigned int irq, void *dev_id)
-{
- struct irq_desc *desc;
- struct irqaction *action;
- unsigned long flags;
-
- if (irq >= NR_IRQS)
- return;
-
- desc = irq_desc + irq;
- spin_lock_irqsave(&desc->lock,flags);
- for (action = desc->action; action != NULL; action = action->next) {
- if (action->dev_id != dev_id)
- continue;
-
- spin_unlock_irqrestore(&desc->lock,flags);
-
- if (teardown_irq(irq, action) == 0)
kfree(action);
+ return;
+ }
+ printk(KERN_ERR "Trying to free already-free IRQ %d\n", irq);
+ spin_unlock_irqrestore(&desc->lock, flags);
return;
}
- printk(KERN_ERR "Trying to free free IRQ%d\n",irq);
- spin_unlock_irqrestore(&desc->lock,flags);
- return;
}
-
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 *),
- unsigned long irqflags, const char * devname, void *dev_id)
+int request_irq(unsigned int irq, irq_handler_t handler,
+ 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 & 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;
action->next = NULL;
action->dev_id = dev_id;
+ select_smp_affinity(irq);
+
retval = setup_irq(irq, action);
if (retval)
kfree(action);
return retval;
}
-
EXPORT_SYMBOL(request_irq);
-