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author | David S. Miller <davem@davemloft.net> | 2006-06-20 08:22:35 (GMT) |
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committer | David S. Miller <davem@davemloft.net> | 2006-06-20 08:22:35 (GMT) |
commit | 8047e247c899f80c33a23ad7e9e250224f0d26a5 (patch) | |
tree | 253a7ba3c902730928214df5c2b5630d7875cc11 /include/asm-sparc64/irq.h | |
parent | 37cdcd9e82108f9b899f1631f66ade2e45738a6e (diff) | |
download | linux-fsl-qoriq-8047e247c899f80c33a23ad7e9e250224f0d26a5.tar.xz |
[SPARC64]: Virtualize IRQ numbers.
Inspired by PowerPC XICS interrupt support code.
All IRQs are virtualized in order to keep NR_IRQS from needing
to be too large. Interrupts on sparc64 are arbitrary 11-bit
values, but we don't need to define NR_IRQS to 2048 if we
virtualize the IRQs.
As PCI and SBUS controller drivers build device IRQs, we divy
out virtual IRQ numbers incrementally starting at 1. Zero is
a special virtual IRQ used for the timer interrupt.
So device drivers all see virtual IRQs, and all the normal
interfaces such as request_irq(), enable_irq(), etc. translate
that into a real IRQ number in order to configure the IRQ.
At this point knowledge of the struct ino_bucket is almost
entirely contained within arch/sparc64/kernel/irq.c There are
a few small bits in the PCI controller drivers that need to
be swept away before we can remove ino_bucket's definition
out of asm-sparc64/irq.h and privately into kernel/irq.c
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/asm-sparc64/irq.h')
-rw-r--r-- | include/asm-sparc64/irq.h | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/include/asm-sparc64/irq.h b/include/asm-sparc64/irq.h index d66c7cd..9edcd90 100644 --- a/include/asm-sparc64/irq.h +++ b/include/asm-sparc64/irq.h @@ -98,13 +98,22 @@ extern struct ino_bucket ivector_table[NUM_IVECS]; #define __bucket(irq) ((struct ino_bucket *)(unsigned long)(irq)) #define __irq(bucket) ((unsigned int)(unsigned long)(bucket)) -#define NR_IRQS 16 +/* The largest number of unique interrupt sources we support. + * If this needs to ever be larger than 255, you need to change + * the type of ino_bucket->virt_irq as appropriate. + * + * ino_bucket->virt_irq allocation is made during {sun4v_,}build_irq(). + */ +#define NR_IRQS 255 +extern void irq_install_pre_handler(int virt_irq, + void (*func)(struct ino_bucket *, void *, void *), + void *arg1, void *arg2); #define irq_canonicalize(irq) (irq) extern void disable_irq(unsigned int); #define disable_irq_nosync disable_irq extern void enable_irq(unsigned int); -extern unsigned int build_irq(int inofixup, unsigned long iclr, unsigned long imap); +extern unsigned int build_irq(int inofixup, unsigned long iclr, unsigned long imap, unsigned char flags); extern unsigned int sun4v_build_irq(u32 devhandle, unsigned int devino, unsigned char flags); extern unsigned int sbus_build_irq(void *sbus, unsigned int ino); |