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authorWill Deacon <will.deacon@arm.com>2011-03-14 14:00:30 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2011-03-15 09:42:28 +0000
commit10a8c3839810ac9af1aec836d61b92e7a879f5fa (patch)
treedbb67f0ed37857b92ee0098791d4d6e3d2a04d46 /arch/arm/include
parent6f685c5cdd29649cf8cc8f57c72791159f936e07 (diff)
ARM: 6806/1: irq: introduce entry and exit functions for chained handlers
Some chained IRQ handlers are written to cope with primary chips of potentially different flow types. Whether this a sensible thing to do is a point of contention. This patch introduces entry/exit functions for chained handlers which infer the flow type of the primary chip as fasteoi or level-type by checking whether or not the ->irq_eoi function pointer is present and calling back to the primary chip as necessary. Other methods of flow control are not considered. Acked-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/include')
-rw-r--r--arch/arm/include/asm/mach/irq.h31
1 files changed, 31 insertions, 0 deletions
diff --git a/arch/arm/include/asm/mach/irq.h b/arch/arm/include/asm/mach/irq.h
index 22ac140edd9e..febe495d0c6e 100644
--- a/arch/arm/include/asm/mach/irq.h
+++ b/arch/arm/include/asm/mach/irq.h
@@ -34,4 +34,35 @@ do { \
raw_spin_unlock(&desc->lock); \
} while(0)
+#ifndef __ASSEMBLY__
+/*
+ * Entry/exit functions for chained handlers where the primary IRQ chip
+ * may implement either fasteoi or level-trigger flow control.
+ */
+static inline void chained_irq_enter(struct irq_chip *chip,
+ struct irq_desc *desc)
+{
+ /* FastEOI controllers require no action on entry. */
+ if (chip->irq_eoi)
+ return;
+
+ if (chip->irq_mask_ack) {
+ chip->irq_mask_ack(&desc->irq_data);
+ } else {
+ chip->irq_mask(&desc->irq_data);
+ if (chip->irq_ack)
+ chip->irq_ack(&desc->irq_data);
+ }
+}
+
+static inline void chained_irq_exit(struct irq_chip *chip,
+ struct irq_desc *desc)
+{
+ if (chip->irq_eoi)
+ chip->irq_eoi(&desc->irq_data);
+ else
+ chip->irq_unmask(&desc->irq_data);
+}
+#endif
+
#endif