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hw/irq: Add qemu_irq_split() so one GPIO output can feed two inputs 

Add a qemu_irq_split() function which allows a board to wire a single
GPIO output up to two GPIO inputs. This is needed for realview boards,
where the MMC card status is visible both in a system register and
via a PL061 GPIO module.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Peter Maydell 2011-02-21 20:57:52 +00:00 committed by Aurelien Jarno
parent 7063f49f59
commit 9793212bb0
2 changed files with 18 additions and 0 deletions
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15
hw/irq.c
View File

@ -75,3 +75,18 @@ qemu_irq qemu_irq_invert(qemu_irq irq)
qemu_irq_raise(irq);
return qemu_allocate_irqs(qemu_notirq, irq, 1)[0];
}
static void qemu_splitirq(void *opaque, int line, int level)
{
struct IRQState **irq = opaque;
irq[0]->handler(irq[0]->opaque, irq[0]->n, level);
irq[1]->handler(irq[1]->opaque, irq[1]->n, level);
}
qemu_irq qemu_irq_split(qemu_irq irq1, qemu_irq irq2)
{
qemu_irq *s = qemu_mallocz(2 * sizeof(qemu_irq));
s[0] = irq1;
s[1] = irq2;
return qemu_allocate_irqs(qemu_splitirq, s, 1)[0];
}

3
hw/irq.h
View File

@ -30,4 +30,7 @@ void qemu_free_irqs(qemu_irq *s);
/* Returns a new IRQ with opposite polarity. */
qemu_irq qemu_irq_invert(qemu_irq irq);
/* Returns a new IRQ which feeds into both the passed IRQs */
qemu_irq qemu_irq_split(qemu_irq irq1, qemu_irq irq2);
#endif