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authorThomas Gleixner <tglx@linutronix.de>2006-06-29 02:24:56 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-29 10:26:24 -0700
commite76de9f8eb67b7acc1cc6f28c4be8583adf0a90c (patch)
treeb2c1c4f58f11772880a48c63c1138fe3b2787c9c /kernel/irq
parentba9a2331bae5da8f65be3722b9e2d210f1987857 (diff)
downloadlinux-e76de9f8eb67b7acc1cc6f28c4be8583adf0a90c.tar.bz2
[PATCH] genirq: add SA_TRIGGER support
Enable drivers to request an IRQ with a given irq-flow (trigger/polarity) setting. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel/irq')
-rw-r--r--kernel/irq/manage.c31
1 files changed, 27 insertions, 4 deletions
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 3ed7aee84865..627d401c2979 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -225,8 +225,14 @@ int setup_irq(unsigned int irq, struct irqaction *new)
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 SA_SHIRQ set and the bits which
+ * set the trigger type must match.
+ */
+ if (!((old->flags & new->flags) & SA_SHIRQ) ||
+ ((old->flags ^ new->flags) & SA_TRIGGER_MASK))
goto mismatch;
#if defined(CONFIG_IRQ_PER_CPU) && defined(SA_PERCPU_IRQ)
@@ -250,7 +256,22 @@ int setup_irq(unsigned int irq, struct irqaction *new)
#endif
if (!shared) {
irq_chip_set_defaults(desc->chip);
- compat_irq_chip_set_default_handler(desc);
+
+ /* Setup the type (level, edge polarity) if configured: */
+ if (new->flags & SA_TRIGGER_MASK) {
+ if (desc->chip && desc->chip->set_type)
+ desc->chip->set_type(irq,
+ new->flags & SA_TRIGGER_MASK);
+ else
+ /*
+ * SA_TRIGGER_* but the PIC does not support
+ * multiple flow-types?
+ */
+ printk(KERN_WARNING "setup_irq(%d) SA_TRIGGER"
+ "set. No set_type function available\n",
+ irq);
+ } else
+ compat_irq_chip_set_default_handler(desc);
desc->status &= ~(IRQ_AUTODETECT | IRQ_WAITING |
IRQ_INPROGRESS);
@@ -262,7 +283,9 @@ int setup_irq(unsigned int irq, struct irqaction *new)
desc->chip->startup(irq);
else
desc->chip->enable(irq);
- }
+ } else
+ /* Undo nested disables: */
+ desc->depth = 1;
}
spin_unlock_irqrestore(&desc->lock, flags);