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
58 lines
1.9 KiB
C
58 lines
1.9 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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/* This is a simple device which has one GPIO input line and multiple
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* GPIO output lines. Any change on the input line is forwarded to all
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* of the outputs.
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*
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* QEMU interface:
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* + one unnamed GPIO input: the input line
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* + N unnamed GPIO outputs: the output lines
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* + QOM property "num-lines": sets the number of output lines
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*/
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#ifndef HW_SPLIT_IRQ_H
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#define HW_SPLIT_IRQ_H
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#include "hw/irq.h"
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#include "hw/sysbus.h"
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#include "qom/object.h"
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#define TYPE_SPLIT_IRQ "split-irq"
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#define MAX_SPLIT_LINES 16
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typedef struct SplitIRQ SplitIRQ;
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#define SPLIT_IRQ(obj) OBJECT_CHECK(SplitIRQ, (obj), TYPE_SPLIT_IRQ)
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struct SplitIRQ {
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DeviceState parent_obj;
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qemu_irq out_irq[MAX_SPLIT_LINES];
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uint16_t num_lines;
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};
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#endif
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