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authorRussell King <rmk+lkml@arm.linux.org.uk>2006-01-08 01:02:07 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-08 20:13:46 -0800
commit9ded96f24c3a5fcbef954e88c443385a1af37eb9 (patch)
tree49f43337e2b8d63a5a28402a15d99fe27d8d2a1c /include/linux/signal.h
parent705b6c7b34f2621f95f606d0e683daa10cdb8eb9 (diff)
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[PATCH] IRQ type flags
Some ARM platforms have the ability to program the interrupt controller to detect various interrupt edges and/or levels. For some platforms, this is critical to setup correctly, particularly those which the setting is dependent on the device. Currently, ARM drivers do (eg) the following: err = request_irq(irq, ...); set_irq_type(irq, IRQT_RISING); However, if the interrupt has previously been programmed to be level sensitive (for whatever reason) then this will cause an interrupt storm. Hence, if we combine set_irq_type() with request_irq(), we can then safely set the type prior to unmasking the interrupt. The unfortunate problem is that in order to support this, these flags need to be visible outside of the ARM architecture - drivers such as smc91x need these flags and they're cross-architecture. Finally, the SA_TRIGGER_* flag passed to request_irq() should reflect the property that the device would like. The IRQ controller code should do its best to select the most appropriate supported mode. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux/signal.h')
-rw-r--r--include/linux/signal.h13
1 files changed, 13 insertions, 0 deletions
diff --git a/include/linux/signal.h b/include/linux/signal.h
index 5dd5f02..ea9eff1 100644
--- a/include/linux/signal.h
+++ b/include/linux/signal.h
@@ -18,6 +18,19 @@
#define SA_PROBE SA_ONESHOT
#define SA_SAMPLE_RANDOM SA_RESTART
#define SA_SHIRQ 0x04000000
+/*
+ * As above, these correspond to the IORESOURCE_IRQ_* defines in
+ * linux/ioport.h to select the interrupt line behaviour. When
+ * requesting an interrupt without specifying a SA_TRIGGER, the
+ * setting should be assumed to be "as already configured", which
+ * may be as per machine or firmware initialisation.
+ */
+#define SA_TRIGGER_LOW 0x00000008
+#define SA_TRIGGER_HIGH 0x00000004
+#define SA_TRIGGER_FALLING 0x00000002
+#define SA_TRIGGER_RISING 0x00000001
+#define SA_TRIGGER_MASK (SA_TRIGGER_HIGH|SA_TRIGGER_LOW|\
+ SA_TRIGGER_RISING|SA_TRIGGER_FALLING)
/*
* Real Time signals may be queued.
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