[MIPS] IRQ cleanups
This is a big irq cleanup patch.
* Use set_irq_chip() to register irq_chip.
* Initialize .mask, .unmask, .mask_ack field. Functions for these
method are already exist in most case.
* Do not initialize .startup, .shutdown, .enable, .disable fields if
default routines provided by irq_chip_set_defaults() were suitable.
* Remove redundant irq_desc initializations.
* Remove unnecessary local_irq_save/local_irq_restore, spin_lock.
With this cleanup, it would be easy to switch to slightly lightwait
irq flow handlers (handle_level_irq(), etc.) instead of __do_IRQ().
Though whole this patch is quite large, changes in each irq_chip are
not quite simple. Please review and test on your platform. Thanks.
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/kernel/i8259.c b/arch/mips/kernel/i8259.c
index 48e3418..2526c0c 100644
--- a/arch/mips/kernel/i8259.c
+++ b/arch/mips/kernel/i8259.c
@@ -40,21 +40,10 @@
enable_8259A_irq(irq);
}
-#define shutdown_8259A_irq disable_8259A_irq
-
void mask_and_ack_8259A(unsigned int);
-static unsigned int startup_8259A_irq(unsigned int irq)
-{
- enable_8259A_irq(irq);
-
- return 0; /* never anything pending */
-}
-
static struct irq_chip i8259A_irq_type = {
.typename = "XT-PIC",
- .startup = startup_8259A_irq,
- .shutdown = shutdown_8259A_irq,
.enable = enable_8259A_irq,
.disable = disable_8259A_irq,
.ack = mask_and_ack_8259A,
@@ -120,7 +109,7 @@
void make_8259A_irq(unsigned int irq)
{
disable_irq_nosync(irq);
- irq_desc[irq].chip = &i8259A_irq_type;
+ set_irq_chip(irq, &i8259A_irq_type);
enable_irq(irq);
}
@@ -323,12 +312,8 @@
init_8259A(0);
- for (i = 0; i < 16; i++) {
- irq_desc[i].status = IRQ_DISABLED;
- irq_desc[i].action = NULL;
- irq_desc[i].depth = 1;
- irq_desc[i].chip = &i8259A_irq_type;
- }
+ for (i = 0; i < 16; i++)
+ set_irq_chip(i, &i8259A_irq_type);
setup_irq(2, &irq2);
}