qemu/hw/irq.h
Peter Maydell 9793212bb0 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>
2011-03-06 19:01:31 +01:00

37 lines
821 B
C

#ifndef QEMU_IRQ_H
#define QEMU_IRQ_H
/* Generic IRQ/GPIO pin infrastructure. */
typedef void (*qemu_irq_handler)(void *opaque, int n, int level);
void qemu_set_irq(qemu_irq irq, int level);
static inline void qemu_irq_raise(qemu_irq irq)
{
qemu_set_irq(irq, 1);
}
static inline void qemu_irq_lower(qemu_irq irq)
{
qemu_set_irq(irq, 0);
}
static inline void qemu_irq_pulse(qemu_irq irq)
{
qemu_set_irq(irq, 1);
qemu_set_irq(irq, 0);
}
/* Returns an array of N IRQs. */
qemu_irq *qemu_allocate_irqs(qemu_irq_handler handler, void *opaque, int n);
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