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[Qemu-devel] [PATCH 4/5] hw/irq: Add qemu_irq_split() so one GPIO output
From: |
Peter Maydell |
Subject: |
[Qemu-devel] [PATCH 4/5] hw/irq: Add qemu_irq_split() so one GPIO output can feed two inputs |
Date: |
Mon, 21 Feb 2011 20:57:52 +0000 |
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 <address@hidden>
---
hw/irq.c | 15 +++++++++++++++
hw/irq.h | 3 +++
2 files changed, 18 insertions(+), 0 deletions(-)
diff --git a/hw/irq.c b/hw/irq.c
index 7703f62..4035a8c 100644
--- a/hw/irq.c
+++ b/hw/irq.c
@@ -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];
+}
diff --git a/hw/irq.h b/hw/irq.h
index f7849ed..389ed7a 100644
--- a/hw/irq.h
+++ b/hw/irq.h
@@ -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
--
1.7.1