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[PATCH] htirq: refactor so we only have one function that writes to the chip

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This refactoring actually optimizes the code a little by caching the value
that we think the device is programmed with instead of reading it back from
the hardware.  Which simplifies the code a little and should speed things up a
bit.

This patch introduces the concept of a ht_irq_msg and modifies the
architecture read/write routines to update this code.

There is a minor consistency fix here as well as x86_64 forgot to initialize
the htirq as masked.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Cc: Andi Kleen <ak@suse.de>
Acked-by: Bryan O'Sullivan <bos@pathscale.com>
Cc: <olson@pathscale.com>
Cc: Roland Dreier <rolandd@cisco.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Eric W. Biederman 2006-11-08 17:44:57 -08:00 • committed by Linus Torvalds
parent 64d9fe6973
commit ec68307cc5
4 changed files with 59 additions and 83 deletions
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11
include/linux/htirq.h
View file

@ -1,11 +1,14 @@
#ifndef LINUX_HTIRQ_H
#define LINUX_HTIRQ_H
struct ht_irq_msg {
u32 address_lo; /* low 32 bits of the ht irq message */
u32 address_hi; /* high 32 bits of the it irq message */
};
/* Helper functions.. */
void write_ht_irq_low(unsigned int irq, u32 data);
void write_ht_irq_high(unsigned int irq, u32 data);
u32 read_ht_irq_low(unsigned int irq);
u32 read_ht_irq_high(unsigned int irq);
void fetch_ht_irq_msg(unsigned int irq, struct ht_irq_msg *msg);
void write_ht_irq_msg(unsigned int irq, struct ht_irq_msg *msg);
void mask_ht_irq(unsigned int irq);
void unmask_ht_irq(unsigned int irq);