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sysbus: Expose IRQ enumeration helpers 

Sysbus devices can get their IRQ lines connected to other devices. It is
possible to figure out which IRQ line a connection is on and whether a sysbus
device even provides an IRQ connector at a specific offset.

This patch exposes helpers to make this information publicly accessible. We
will need it for the platform bus dynamic sysbus enumeration.

Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Alexander Graf 2014-09-24 12:32:17 +02:00
parent 33cd52b5d7
commit b797318666
4 changed files with 36 additions and 0 deletions
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11
hw/core/qdev.c
View File

@ -453,6 +453,17 @@ void qdev_connect_gpio_out_named(DeviceState *dev, const char *name, int n,
g_free(propname);
}
qemu_irq qdev_get_gpio_out_connector(DeviceState *dev, const char *name, int n)
{
char *propname = g_strdup_printf("%s[%d]",
name ? name : "unnamed-gpio-out", n);
qemu_irq ret = (qemu_irq)object_property_get_link(OBJECT(dev), propname,
NULL);
return ret;
}
/* disconnect a GPIO ouput, returning the disconnected input (if any) */
static qemu_irq qdev_disconnect_gpio_out_named(DeviceState *dev,

21
hw/core/sysbus.c
View File

@ -84,6 +84,27 @@ static const TypeInfo system_bus_info = {
.class_init = system_bus_class_init,
};
/* Check whether an IRQ source exists */
bool sysbus_has_irq(SysBusDevice *dev, int n)
{
char *prop = g_strdup_printf("%s[%d]", SYSBUS_DEVICE_GPIO_IRQ, n);
ObjectProperty *r;
r = object_property_find(OBJECT(dev), prop, NULL);
return (r != NULL);
}
bool sysbus_is_irq_connected(SysBusDevice *dev, int n)
{
return !!sysbus_get_connected_irq(dev, n);
}
qemu_irq sysbus_get_connected_irq(SysBusDevice *dev, int n)
{
DeviceState *d = DEVICE(dev);
return qdev_get_gpio_out_connector(d, SYSBUS_DEVICE_GPIO_IRQ, n);
}
void sysbus_connect_irq(SysBusDevice *dev, int n, qemu_irq irq)
{
qdev_connect_gpio_out_named(DEVICE(dev), SYSBUS_DEVICE_GPIO_IRQ, n, irq);

1
include/hw/qdev-core.h
View File

@ -272,6 +272,7 @@ qemu_irq qdev_get_gpio_in_named(DeviceState *dev, const char *name, int n);
void qdev_connect_gpio_out(DeviceState *dev, int n, qemu_irq pin);
void qdev_connect_gpio_out_named(DeviceState *dev, const char *name, int n,
qemu_irq pin);
qemu_irq qdev_get_gpio_out_connector(DeviceState *dev, const char *name, int n);
qemu_irq qdev_intercept_gpio_out(DeviceState *dev, qemu_irq icpt,
const char *name, int n);

3
include/hw/sysbus.h
View File

@ -66,7 +66,10 @@ void sysbus_pass_irq(SysBusDevice *dev, SysBusDevice *target);
void sysbus_init_ioports(SysBusDevice *dev, pio_addr_t ioport, pio_addr_t size);
bool sysbus_has_irq(SysBusDevice *dev, int n);
void sysbus_connect_irq(SysBusDevice *dev, int n, qemu_irq irq);
bool sysbus_is_irq_connected(SysBusDevice *dev, int n);
qemu_irq sysbus_get_connected_irq(SysBusDevice *dev, int n);
void sysbus_mmio_map(SysBusDevice *dev, int n, hwaddr addr);
void sysbus_mmio_map_overlap(SysBusDevice *dev, int n, hwaddr addr,
int priority);