Add a common routine for parsing FDT data describing an ARM GIC interrupt.

In the fdt data we've written for ourselves, the interrupt properties
for GIC interrupts have just been a bare interrupt number.  In standard
data that conforms to the published bindings, GIC interrupt properties
contain 3-tuples that describe the interrupt as shared vs private, the
interrupt number within the shared/private address space, and configuration
info such as level vs edge triggered.

The new gic_decode_fdt() function parses both types of data, based on the
#interrupt-cells property.  Previously, each platform implemented a decode
routine and put a pointer to it into fdt_pic_table.  Now they can just
list this function in their table instead if they use arm/gic.c.

1 files changed, 2 insertions, 0 deletions

diff --git a/sys/arm/include/intr.h b/sys/arm/include/intr.h
index c1d4e39..3509772 100644
--- a/sys/arm/include/intr.h
+++ b/sys/arm/include/intr.h
@@ -82,5 +82,7 @@ extern int (*arm_config_irq)(int irq, enum intr_trigger trig,
 void arm_irq_memory_barrier(uintptr_t);
 
 void gic_init_secondary(void);
+int  gic_decode_fdt(uint32_t iparentnode, uint32_t *intrcells, int *interrupt,
+    int *trig, int *pol);
 
 #endif	/* _MACHINE_INTR_H */