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| author | Peter Maydell <peter.maydell@linaro.org> | 2018-03-02 10:45:38 +0000 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2018-03-02 11:03:45 +0000 |
| commit | 5edb1b3fa93217cf7adc50725a69ab0cefcea973 (patch) | |
| tree | 0cce7bbddb09998b7162d7da5fcb6e2c31c7811d /include/hw/irq.h | |
| parent | 4a151677a8ea80e65f519fed1df92c0db6350a02 (diff) | |
| download | qemu-5edb1b3fa93217cf7adc50725a69ab0cefcea973.zip qemu-5edb1b3fa93217cf7adc50725a69ab0cefcea973.tar.gz qemu-5edb1b3fa93217cf7adc50725a69ab0cefcea973.tar.bz2 | |
hw/core/split-irq: Device that splits IRQ lines
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
Diffstat (limited to 'include/hw/irq.h')
| -rw-r--r-- | include/hw/irq.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/include/hw/irq.h b/include/hw/irq.h index 4c4c2ea..7a40e3e 100644 --- a/include/hw/irq.h +++ b/include/hw/irq.h @@ -50,7 +50,9 @@ void qemu_free_irq(qemu_irq irq); /* Returns a new IRQ with opposite polarity. */ qemu_irq qemu_irq_invert(qemu_irq irq); -/* Returns a new IRQ which feeds into both the passed IRQs */ +/* Returns a new IRQ which feeds into both the passed IRQs. + * It's probably better to use the TYPE_SPLIT_IRQ device instead. + */ qemu_irq qemu_irq_split(qemu_irq irq1, qemu_irq irq2); /* Returns a new IRQ set which connects 1:1 to another IRQ set, which |