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hw/core/split-irq: Device that splits IRQ lines

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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
This commit is contained in:
Peter Maydell 2018-03-02 10:45:38 +00:00
parent 4a151677a8
commit 5edb1b3fa9
4 changed files with 150 additions and 1 deletions
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1
hw/core/Makefile.objs
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@ -18,6 +18,7 @@ common-obj-$(CONFIG_FITLOADER) += loader-fit.o
common-obj-$(CONFIG_SOFTMMU) += qdev-properties-system.o
common-obj-$(CONFIG_SOFTMMU) += register.o
common-obj-$(CONFIG_SOFTMMU) += or-irq.o
common-obj-$(CONFIG_SOFTMMU) += split-irq.o
common-obj-$(CONFIG_PLATFORM_BUS) += platform-bus.o
obj-$(CONFIG_SOFTMMU) += generic-loader.o