[PATCH] genirq: add irq-chip support

Enable platforms to use the irq-chip and irq-flow abstractions: allow setting
of the chip, the type and provide highlevel handlers for common irq-flows.

[rostedt@goodmis.org: misroute-irq: Don't call desc->chip->end because of edge interrupts]
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

include/linux/irq.h

@@ -383,6 +383,17 @@ set_irq_chained_handler(unsigned int irq,
 	__set_irq_handler(irq, handle, 1);
 }
 
+/* Set/get chip/data for an IRQ: */
+
+extern int set_irq_chip(unsigned int irq, struct irq_chip *chip);
+extern int set_irq_data(unsigned int irq, void *data);
+extern int set_irq_chip_data(unsigned int irq, void *data);
+extern int set_irq_type(unsigned int irq, unsigned int type);
+
+#define get_irq_chip(irq)	(irq_desc[irq].chip)
+#define get_irq_chip_data(irq)	(irq_desc[irq].chip_data)
+#define get_irq_data(irq)	(irq_desc[irq].handler_data)
+
 #endif /* CONFIG_GENERIC_HARDIRQS */
 
 #endif /* !CONFIG_S390 */

kernel/irq/Makefile

 
-obj-y := handle.o manage.o spurious.o resend.o
+obj-y := handle.o manage.o spurious.o resend.o chip.o
 obj-$(CONFIG_GENERIC_IRQ_PROBE) += autoprobe.o
 obj-$(CONFIG_PROC_FS) += proc.o
 obj-$(CONFIG_GENERIC_PENDING_IRQ) += migration.o

kernel/irq/spurious.c

@@ -79,7 +79,7 @@ static int misrouted_irq(int irq, struct pt_regs *regs)
 		 * If we did actual work for the real IRQ line we must let the
 		 * IRQ controller clean up too
 		 */
-		if (work)
+		if (work && desc->chip && desc->chip->end)
 			desc->chip->end(i);
 		spin_unlock(&desc->lock);
 	}