@@ -18,6 +18,7 @@ common-obj-$(CONFIG_FITLOADER) += loader-fit.o
common-obj-$(CONFIG_SOFTMMU) += qdev-properties-system.o
common-obj-$(CONFIG_SOFTMMU) += register.o
common-obj-$(CONFIG_SOFTMMU) += or-irq.o
+common-obj-$(CONFIG_SOFTMMU) += split-irq.o
common-obj-$(CONFIG_PLATFORM_BUS) += platform-bus.o
obj-$(CONFIG_SOFTMMU) += generic-loader.o
new file mode 100644
@@ -0,0 +1,57 @@
+/*
+ * IRQ splitter device.
+ *
+ * Copyright (c) 2018 Linaro Limited.
+ * Written by Peter Maydell
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+/* This is a simple device which has one GPIO input line and multiple
+ * GPIO output lines. Any change on the input line is forwarded to all
+ * of the outputs.
+ *
+ * QEMU interface:
+ * + one unnamed GPIO input: the input line
+ * + N unnamed GPIO outputs: the output lines
+ * + QOM property "num-lines": sets the number of output lines
+ */
+#ifndef HW_SPLIT_IRQ_H
+#define HW_SPLIT_IRQ_H
+
+#include "hw/irq.h"
+#include "hw/sysbus.h"
+#include "qom/object.h"
+
+#define TYPE_SPLIT_IRQ "split-irq"
+
+#define MAX_SPLIT_LINES 16
+
+typedef struct SplitIRQ SplitIRQ;
+
+#define SPLIT_IRQ(obj) OBJECT_CHECK(SplitIRQ, (obj), TYPE_SPLIT_IRQ)
+
+struct SplitIRQ {
+ DeviceState parent_obj;
+
+ qemu_irq out_irq[MAX_SPLIT_LINES];
+ uint16_t num_lines;
+};
+
+#endif
@@ -50,7 +50,9 @@ void qemu_free_irq(qemu_irq irq);
/* 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 */
+/* Returns a new IRQ which feeds into both the passed IRQs.
+ * It's probably better to use the TYPE_SPLIT_IRQ device instead.
+ */
qemu_irq qemu_irq_split(qemu_irq irq1, qemu_irq irq2);
/* Returns a new IRQ set which connects 1:1 to another IRQ set, which
new file mode 100644
@@ -0,0 +1,89 @@
+/*
+ * IRQ splitter device.
+ *
+ * Copyright (c) 2018 Linaro Limited.
+ * Written by Peter Maydell
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "qemu/osdep.h"
+#include "hw/core/split-irq.h"
+#include "qapi/error.h"
+
+static void split_irq_handler(void *opaque, int n, int level)
+{
+ SplitIRQ *s = SPLIT_IRQ(opaque);
+ int i;
+
+ for (i = 0; i < s->num_lines; i++) {
+ qemu_set_irq(s->out_irq[i], level);
+ }
+}
+
+static void split_irq_init(Object *obj)
+{
+ qdev_init_gpio_in(DEVICE(obj), split_irq_handler, 1);
+}
+
+static void split_irq_realize(DeviceState *dev, Error **errp)
+{
+ SplitIRQ *s = SPLIT_IRQ(dev);
+
+ if (s->num_lines < 1 || s->num_lines >= MAX_SPLIT_LINES) {
+ error_setg(errp,
+ "IRQ splitter number of lines %d is not between 1 and %d",
+ s->num_lines, MAX_SPLIT_LINES);
+ return;
+ }
+
+ qdev_init_gpio_out(dev, s->out_irq, s->num_lines);
+}
+
+static Property split_irq_properties[] = {
+ DEFINE_PROP_UINT16("num-lines", SplitIRQ, num_lines, 1),
+ DEFINE_PROP_END_OF_LIST(),
+};
+
+static void split_irq_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+
+ /* No state to reset or migrate */
+ dc->props = split_irq_properties;
+ dc->realize = split_irq_realize;
+
+ /* Reason: Needs to be wired up to work */
+ dc->user_creatable = false;
+}
+
+static const TypeInfo split_irq_type_info = {
+ .name = TYPE_SPLIT_IRQ,
+ .parent = TYPE_DEVICE,
+ .instance_size = sizeof(SplitIRQ),
+ .instance_init = split_irq_init,
+ .class_init = split_irq_class_init,
+};
+
+static void split_irq_register_types(void)
+{
+ type_register_static(&split_irq_type_info);
+}
+
+type_init(split_irq_register_types)