From 1b2556776531ba3f492f5ce9f6ae769f3b4e7a82 Mon Sep 17 00:00:00 2001 From: Alistair Francis Date: Tue, 4 Oct 2016 13:28:07 +0100 Subject: [PATCH] irq: Add a new irq device that allows the ORing of lines Signed-off-by: Alistair Francis Message-id: 52e5d361e3b5a0ea8554aca73ee65ae2b586112e.1474742262.git.alistair@alistair23.me Reviewed-by: Peter Maydell Signed-off-by: Peter Maydell --- hw/core/Makefile.objs | 1 + hw/core/or-irq.c | 107 ++++++++++++++++++++++++++++++++++++++++++ include/hw/or-irq.h | 44 +++++++++++++++++ 3 files changed, 152 insertions(+) create mode 100644 hw/core/or-irq.c create mode 100644 include/hw/or-irq.h diff --git a/hw/core/Makefile.objs b/hw/core/Makefile.objs index cfd4840397..b47241bb2f 100644 --- a/hw/core/Makefile.objs +++ b/hw/core/Makefile.objs @@ -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 diff --git a/hw/core/or-irq.c b/hw/core/or-irq.c new file mode 100644 index 0000000000..1ac090d1a4 --- /dev/null +++ b/hw/core/or-irq.c @@ -0,0 +1,107 @@ +/* + * QEMU IRQ/GPIO common code. + * + * Copyright (c) 2016 Alistair Francis . + * + * 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) 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 . + * + * 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; +};