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 <[email protected]>

diff --git a/hw/core/qdev.c b/hw/core/qdev.c
index b3d519645a48047729b44c10aacb457a27d28224..413b41376f75a5dec17c80ee4da497923efbdcb3 100644 (file)
--- a/hw/core/qdev.c
+++ b/hw/core/qdev.c
@@ -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,

diff --git a/hw/core/sysbus.c b/hw/core/sysbus.c
index 7bfe381cd8444fd14cd1dfed89dec59128446235..945dec53d05cf6aead2a40b2d6f8e1de8d61d43d 100644 (file)
--- a/hw/core/sysbus.c
+++ b/hw/core/sysbus.c
@@ -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);

diff --git a/include/hw/qdev-core.h b/include/hw/qdev-core.h
index 00a15a3977777a8f0a2672c34ac08dcdd0d084a1..d3a29408d4fb53cf536217e4fb230926d3b900d6 100644 (file)
--- a/include/hw/qdev-core.h
+++ b/include/hw/qdev-core.h
@@ -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);
 

diff --git a/include/hw/sysbus.h b/include/hw/sysbus.h
index 80529ffed8b5469684526e52ef7e99ce6f4ee2a3..2a3cfa785f4293de4246cd68fecbc5c1380e32ea 100644 (file)
--- a/include/hw/sysbus.h
+++ b/include/hw/sysbus.h
@@ -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);