From 9793212bb02b9fdc2de188a42b93b17ca2689c9a Mon Sep 17 00:00:00 2001 From: Peter Maydell Date: Mon, 21 Feb 2011 20:57:52 +0000 Subject: [PATCH] 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 Signed-off-by: Aurelien Jarno --- hw/irq.c | 15 +++++++++++++++ hw/irq.h | 3 +++ 2 files changed, 18 insertions(+) diff --git a/hw/irq.c b/hw/irq.c index 7703f62c6c..4035a8cbff 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 f7849edc8e..389ed7a506 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