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Align Raspberry Pi DMA interrupts with Linux DTS

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There is nothing in the specs on DMA engine interrupt lines: it should have
been in the "BCM2835 ARM Peripherals" datasheet but the appropriate
"ARM peripherals interrupt table" (p.113) is nearly empty.

All Raspberry Pi models 1-3 (based on bcm2835) have
Linux device tree (arch/arm/boot/dts/bcm2835-common.dtsi +25):

    /* dma channel 11-14 share one irq */

This information is repeated in the driver code
(drivers/dma/bcm2835-dma.c +1344):

    /*
     * in case of channel >= 11
     * use the 11th interrupt and that is shared
     */

In this patch channels 0--10 and 11--14 are handled separately.

Signed-off-by: Andrey Makarov <andrey.makarov@auriga.com>
Message-id: 20220716113210.349153-1-andrey.makarov@auriga.com
[PMM: fixed checkpatch nits]
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Andrey Makarov 2022-07-16 14:32:10 +03:00 • committed by Peter Maydell
parent 53ae2fdef1
commit 004c8a8bc5
4 changed files with 147 additions and 2 deletions
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3
tests/qtest/meson.build
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@ -218,7 +218,8 @@ qtests_aarch64 = \
['arm-cpu-features',
'numa-test',
'boot-serial-test',
'migration-test']
'migration-test',
'bcm2835-dma-test']
qtests_s390x = \
(slirp.found() ? ['pxe-test', 'test-netfilter'] : []) + \