Commit 4a4cf779 authored by Ralf Baechle's avatar Ralf Baechle
Browse files

[MIPS] Make irq number allocator generally available for fixing EV64120.


Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 325d08d1
......@@ -26,6 +26,48 @@
#include <asm/system.h>
#include <asm/uaccess.h>
static unsigned long irq_map[NR_IRQS / BITS_PER_LONG];
int __devinit allocate_irqno(void)
{
int irq;
again:
irq = find_first_zero_bit(irq_map, NR_IRQS);
if (irq >= NR_IRQS)
return -ENOSPC;
if (test_and_set_bit(irq, irq_map))
goto again;
return irq;
}
EXPORT_SYMBOL_GPL(allocate_irqno);
/*
* Allocate the 16 legacy interrupts for i8259 devices. This happens early
* in the kernel initialization so treating allocation failure as BUG() is
* ok.
*/
void __init alloc_legacy_irqno(void)
{
int i;
for (i = 0; i <= 16; i++)
BUG_ON(test_and_set_bit(i, irq_map));
}
void __devinit free_irqno(unsigned int irq)
{
smp_mb__before_clear_bit();
clear_bit(irq, irq_map);
smp_mb__after_clear_bit();
}
EXPORT_SYMBOL_GPL(free_irqno);
/*
* 'what should we do if we get a hw irq event on an illegal vector'.
* each architecture has to answer this themselves.
......
......@@ -354,29 +354,6 @@ static struct irq_chip bridge_irq_type = {
.end = end_bridge_irq,
};
static unsigned long irq_map[NR_IRQS / BITS_PER_LONG];
int allocate_irqno(void)
{
int irq;
again:
irq = find_first_zero_bit(irq_map, NR_IRQS);
if (irq >= NR_IRQS)
return -ENOSPC;
if (test_and_set_bit(irq, irq_map))
goto again;
return irq;
}
void free_irqno(unsigned int irq)
{
clear_bit(irq, irq_map);
}
void __devinit register_bridge_irq(unsigned int irq)
{
irq_desc[irq].status = IRQ_DISABLED;
......
......@@ -214,8 +214,6 @@ static struct irqaction rt_irqaction = {
.name = "timer"
};
extern int allocate_irqno(void);
void __init plat_timer_setup(struct irqaction *irq)
{
int irqno = allocate_irqno();
......
......@@ -74,4 +74,8 @@ extern int setup_irq_smtc(unsigned int irq, struct irqaction * new,
unsigned long hwmask);
#endif /* CONFIG_MIPS_MT_SMTC */
extern int allocate_irqno(void);
extern void alloc_legacy_irqno(void);
extern void free_irqno(unsigned int irq);
#endif /* _ASM_IRQ_H */
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