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>
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15
hw/irq.c
15
hw/irq.c
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@ -75,3 +75,18 @@ qemu_irq qemu_irq_invert(qemu_irq irq)
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qemu_irq_raise(irq);
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qemu_irq_raise(irq);
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return qemu_allocate_irqs(qemu_notirq, irq, 1)[0];
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return qemu_allocate_irqs(qemu_notirq, irq, 1)[0];
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}
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}
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static void qemu_splitirq(void *opaque, int line, int level)
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{
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struct IRQState **irq = opaque;
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irq[0]->handler(irq[0]->opaque, irq[0]->n, level);
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irq[1]->handler(irq[1]->opaque, irq[1]->n, level);
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}
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qemu_irq qemu_irq_split(qemu_irq irq1, qemu_irq irq2)
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{
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qemu_irq *s = qemu_mallocz(2 * sizeof(qemu_irq));
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s[0] = irq1;
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s[1] = irq2;
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return qemu_allocate_irqs(qemu_splitirq, s, 1)[0];
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}
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3
hw/irq.h
3
hw/irq.h
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@ -30,4 +30,7 @@ void qemu_free_irqs(qemu_irq *s);
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/* Returns a new IRQ with opposite polarity. */
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/* Returns a new IRQ with opposite polarity. */
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qemu_irq qemu_irq_invert(qemu_irq irq);
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qemu_irq qemu_irq_invert(qemu_irq irq);
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/* Returns a new IRQ which feeds into both the passed IRQs */
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qemu_irq qemu_irq_split(qemu_irq irq1, qemu_irq irq2);
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#endif
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#endif
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