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sh: Simplify "multi-evt" interrupt handling. 

This patch changes the way in which "multi-evt" interrups are handled.
The intc_evt2irq_table and related intc_evt2irq() have been removed and
the "redirecting" handler is installed for the coupled interrupts.

Thanks to that the do_IRQ() function don't have to use another level
of indirection for all the interrupts...

Signed-off-by: Pawel Moll <pawel.moll@st.com>
Signed-off-by: Stuart Menefy <stuart.menefy@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Pawel Moll 2009-08-24 19:52:38 +09:00 committed by Paul Mundt
parent 788e6af37a
commit 05ecd5a1f7
3 changed files with 18 additions and 39 deletions
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2
arch/sh/kernel/irq.c
View File

@ -114,7 +114,7 @@ asmlinkage int do_IRQ(unsigned int irq, struct pt_regs *regs)
#endif
irq_enter();
irq = irq_demux(intc_evt2irq(irq));
irq = irq_demux(evt2irq(irq));
#ifdef CONFIG_IRQSTACKS
curctx = (union irq_ctx *)current_thread_info();

54
drivers/sh/intc.c
View File

@ -663,16 +663,9 @@ static unsigned int __init save_reg(struct intc_desc_int *d,
return 0;
}
static unsigned char *intc_evt2irq_table;
unsigned int intc_evt2irq(unsigned int vector)
static void intc_redirect_irq(unsigned int irq, struct irq_desc *desc)
{
unsigned int irq = evt2irq(vector);
if (intc_evt2irq_table && intc_evt2irq_table[irq])
irq = intc_evt2irq_table[irq];
return irq;
generic_handle_irq((unsigned int)get_irq_data(irq));
}
void __init register_intc_controller(struct intc_desc *desc)
@ -745,34 +738,6 @@ void __init register_intc_controller(struct intc_desc *desc)
BUG_ON(k > 256); /* _INTC_ADDR_E() and _INTC_ADDR_D() are 8 bits */
/* keep the first vector only if same enum is used multiple times */
for (i = 0; i < desc->nr_vectors; i++) {
struct intc_vect *vect = desc->vectors + i;
int first_irq = evt2irq(vect->vect);
if (!vect->enum_id)
continue;
for (k = i + 1; k < desc->nr_vectors; k++) {
struct intc_vect *vect2 = desc->vectors + k;
if (vect->enum_id != vect2->enum_id)
continue;
vect2->enum_id = 0;
if (!intc_evt2irq_table)
intc_evt2irq_table = kzalloc(NR_IRQS, GFP_NOWAIT);
if (!intc_evt2irq_table) {
pr_warning("intc: cannot allocate evt2irq!\n");
continue;
}
intc_evt2irq_table[evt2irq(vect2->vect)] = first_irq;
}
}
/* register the vectors one by one */
for (i = 0; i < desc->nr_vectors; i++) {
struct intc_vect *vect = desc->vectors + i;
@ -789,6 +754,21 @@ void __init register_intc_controller(struct intc_desc *desc)
}
intc_register_irq(desc, d, vect->enum_id, irq);
for (k = i + 1; k < desc->nr_vectors; k++) {
struct intc_vect *vect2 = desc->vectors + k;
unsigned int irq2 = evt2irq(vect2->vect);
if (vect->enum_id != vect2->enum_id)
continue;
vect2->enum_id = 0;
/* redirect this interrupts to the first one */
set_irq_chip_and_handler_name(irq2, &d->chip,
intc_redirect_irq, "redirect");
set_irq_data(irq2, (void *)irq);
}
}
}

1
include/linux/sh_intc.h
View File

@ -85,7 +85,6 @@ struct intc_desc symbol __initdata = { \
}
#endif
unsigned int intc_evt2irq(unsigned int vector);
void __init register_intc_controller(struct intc_desc *desc);
int intc_set_priority(unsigned int irq, unsigned int prio);