5edb1b3fa9
In some board or SoC models it is necessary to split a qemu_irq line so that one input can feed multiple outputs. We currently have qemu_irq_split() for this, but that has several deficiencies: * it can only handle splitting a line into two * it unavoidably leaks memory, so it can't be used in a device that can be deleted Implement a qdev device that encapsulates splitting of IRQs, with a configurable number of outputs. (This is in some ways the inverse of the TYPE_OR_IRQ device.) Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-id: 20180220180325.29818-13-peter.maydell@linaro.org
90 lines
2.7 KiB
C
90 lines
2.7 KiB
C
/*
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* IRQ splitter device.
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*
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* Copyright (c) 2018 Linaro Limited.
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* Written by Peter Maydell
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu/osdep.h"
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#include "hw/core/split-irq.h"
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#include "qapi/error.h"
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static void split_irq_handler(void *opaque, int n, int level)
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{
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SplitIRQ *s = SPLIT_IRQ(opaque);
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int i;
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for (i = 0; i < s->num_lines; i++) {
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qemu_set_irq(s->out_irq[i], level);
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}
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}
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static void split_irq_init(Object *obj)
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{
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qdev_init_gpio_in(DEVICE(obj), split_irq_handler, 1);
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}
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static void split_irq_realize(DeviceState *dev, Error **errp)
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{
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SplitIRQ *s = SPLIT_IRQ(dev);
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if (s->num_lines < 1 || s->num_lines >= MAX_SPLIT_LINES) {
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error_setg(errp,
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"IRQ splitter number of lines %d is not between 1 and %d",
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s->num_lines, MAX_SPLIT_LINES);
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return;
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}
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qdev_init_gpio_out(dev, s->out_irq, s->num_lines);
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}
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static Property split_irq_properties[] = {
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DEFINE_PROP_UINT16("num-lines", SplitIRQ, num_lines, 1),
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DEFINE_PROP_END_OF_LIST(),
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};
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static void split_irq_class_init(ObjectClass *klass, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(klass);
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/* No state to reset or migrate */
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dc->props = split_irq_properties;
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dc->realize = split_irq_realize;
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/* Reason: Needs to be wired up to work */
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dc->user_creatable = false;
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}
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static const TypeInfo split_irq_type_info = {
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.name = TYPE_SPLIT_IRQ,
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.parent = TYPE_DEVICE,
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.instance_size = sizeof(SplitIRQ),
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.instance_init = split_irq_init,
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.class_init = split_irq_class_init,
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};
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static void split_irq_register_types(void)
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{
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type_register_static(&split_irq_type_info);
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}
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type_init(split_irq_register_types)
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