irq: Add a new irq device that allows the ORing of lines (1b255677) · Commits · SUMMER2020 / students / proj-2021291

hw/core/Makefile.objs

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		@@ -16,4 +16,5 @@ common-obj-$(CONFIG_SOFTMMU) += null-machine.o
		common-obj-$(CONFIG_SOFTMMU) += loader.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_PLATFORM_BUS) += platform-bus.o

hw/core/or-irq.c

0 → 100644

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		/*
		* 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 "qemu/osdep.h"
		#include "hw/or-irq.h"

		static void or_irq_handler(void *opaque, int n, int level)
		{
		qemu_or_irq *s = OR_IRQ(opaque);
		int or_level = 0;
		int i;

		s->levels[n] = level;

		for (i = 0; i < s->num_lines; i++) {
		or_level \|= s->levels[i];
		}

		qemu_set_irq(s->out_irq, or_level);
		}

		static void or_irq_reset(DeviceState *dev)
		{
		qemu_or_irq *s = OR_IRQ(dev);
		int i;

		for (i = 0; i < MAX_OR_LINES; i++) {
		s->levels[i] = false;
		}
		}

		static void or_irq_realize(DeviceState dev, Error *errp)
		{
		qemu_or_irq *s = OR_IRQ(dev);

		assert(s->num_lines < MAX_OR_LINES);

		qdev_init_gpio_in(dev, or_irq_handler, s->num_lines);
		}

		static void or_irq_init(Object *obj)
		{
		qemu_or_irq *s = OR_IRQ(obj);

		qdev_init_gpio_out(DEVICE(obj), &s->out_irq, 1);
		}

		static const VMStateDescription vmstate_or_irq = {
		.name = TYPE_OR_IRQ,
		.version_id = 1,
		.minimum_version_id = 1,
		.fields = (VMStateField[]) {
		VMSTATE_BOOL_ARRAY(levels, qemu_or_irq, MAX_OR_LINES),
		VMSTATE_END_OF_LIST(),
		}
		};

		static Property or_irq_properties[] = {
		DEFINE_PROP_UINT16("num-lines", qemu_or_irq, num_lines, 1),
		DEFINE_PROP_END_OF_LIST(),
		};

		static void or_irq_class_init(ObjectClass klass, void data)
		{
		DeviceClass *dc = DEVICE_CLASS(klass);

		dc->reset = or_irq_reset;
		dc->props = or_irq_properties;
		dc->realize = or_irq_realize;
		dc->vmsd = &vmstate_or_irq;
		}

		static const TypeInfo or_irq_type_info = {
		.name = TYPE_OR_IRQ,
		.parent = TYPE_DEVICE,
		.instance_size = sizeof(qemu_or_irq),
		.instance_init = or_irq_init,
		.class_init = or_irq_class_init,
		};

		static void or_irq_register_types(void)
		{
		type_register_static(&or_irq_type_info);
		}

		type_init(or_irq_register_types)

include/hw/or-irq.h

0 → 100644

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Original line number	Diff line number	Diff line
		/*
		* 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;
		};