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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
Download patch file Download diff file Expand all files Collapse all files

2
include/hw/arm/bcm2835_peripherals.h
View file

@ -17,6 +17,7 @@
#include "hw/char/bcm2835_aux.h"
#include "hw/display/bcm2835_fb.h"
#include "hw/dma/bcm2835_dma.h"
#include "hw/or-irq.h"
#include "hw/intc/bcm2835_ic.h"
#include "hw/misc/bcm2835_property.h"
#include "hw/misc/bcm2835_rng.h"
@ -55,6 +56,7 @@ struct BCM2835PeripheralState {
BCM2835AuxState aux;
BCM2835FBState fb;
BCM2835DMAState dma;
qemu_or_irq orgated_dma_irq;
BCM2835ICState ic;
BCM2835PropertyState property;
BCM2835RngState rng;