irq: Add a new irq device that allows the ORing of lines

Signed-off-by: Alistair Francis <alistair@alistair23.me>
Message-id: 52e5d361e3b5a0ea8554aca73ee65ae2b586112e.1474742262.git.alistair@alistair23.me
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 44 insertions, 0 deletions

diff --git a/include/hw/or-irq.h b/include/hw/or-irq.h
new file mode 100644
index 0000000000..d400a8120b
--- /dev/null
+++ b/include/hw/or-irq.h
@@ -0,0 +1,44 @@
+/*
+ * QEMU IRQ/GPIO common code.
+ *
+ * Copyright (c) 2016 Alistair Francis <alistair@alistair23.me>.
+ *
+ * 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 "hw/irq.h"
+#include "hw/sysbus.h"
+#include "qom/object.h"
+
+#define TYPE_OR_IRQ "or-irq"
+
+#define MAX_OR_LINES      16
+
+typedef struct OrIRQState qemu_or_irq;
+
+#define OR_IRQ(obj) OBJECT_CHECK(qemu_or_irq, (obj), TYPE_OR_IRQ)
+
+struct OrIRQState {
+    DeviceState parent_obj;
+
+    qemu_irq out_irq;
+    qemu_irq *in_irqs;
+    bool levels[MAX_OR_LINES];
+    uint16_t num_lines;
+};