/*
* Deregister an interrupt handler.
*/
void
sa11x0_intr_disestablish(sa11x0_chipset_tag_t ic, void *arg)
{
struct irqhandler *ih = arg;
int irq = ih->ih_irq;
int saved_cpsr;
struct irqhandler **p, *q;
#if DIAGNOSTIC
if (irq < 0 || irq >= ICU_LEN)
panic("intr_disestablish: bogus irq");
#endif
/*
* Remove the handler from the chain.
* This is O(n^2), too.
*/
for (p = &irqhandlers[irq]; (q = *p) != NULL && q != ih;
p = &q->ih_next)
;
if (q)
*p = q->ih_next;
else
panic("intr_disestablish: handler not registered");
free(ih, M_DEVBUF);
intr_calculatemasks();
saved_cpsr = SetCPSR(I32_bit, I32_bit);
set_spl_masks();
irq_setmasks();
SetCPSR(I32_bit, saved_cpsr & I32_bit);
}
void *
sa11x0_intr_establish(sa11x0_chipset_tag_t ic, int irq, int type, int level,
int (*ih_fun)(void *), void *ih_arg)
{
int saved_cpsr;
struct irqhandler **p, *q, *ih;
static struct irqhandler fakehand = {fakeintr};
/* no point in sleeping unless someone can free memory. */
ih = malloc(sizeof *ih, M_DEVBUF, cold ? M_NOWAIT : M_WAITOK);
if (ih == NULL)
panic("sa11x0_intr_establish: can't malloc handler info");
if (irq < 0 || irq >= ICU_LEN || type == IST_NONE)
panic("intr_establish: bogus irq or type");
/* All interrupts are level intrs. */
/*
* Figure out where to put the handler.
* This is O(N^2), but we want to preserve the order, and N is
* generally small.
*/
for (p = &irqhandlers[irq]; (q = *p) != NULL; p = &q->ih_next)
;
/*
* Actually install a fake handler momentarily, since we might be doing
* this with interrupts enabled and don't want the real routine called
* until masking is set up.
*/
fakehand.ih_level = level;
*p = &fakehand;
intr_calculatemasks();
/*
* Poke the real handler in now.
*/
ih->ih_func = ih_fun;
ih->ih_arg = ih_arg;
ih->ih_count = 0;
ih->ih_next = NULL;
ih->ih_level = level;
ih->ih_irq = irq;
ih->ih_name = NULL; /* XXX */
*p = ih;
saved_cpsr = SetCPSR(I32_bit, I32_bit);
set_spl_masks();
irq_setmasks();
SetCPSR(I32_bit, saved_cpsr & I32_bit);
#ifdef DEBUG
dumpirqhandlers();
#endif
return (ih);
}
void
enable_irq(int irq)
{
u_int oldirqstate;
oldirqstate = disable_interrupts(I32_bit);
current_mask |= (1 << irq);
irq_setmasks();
restore_interrupts(oldirqstate);
}
