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bcm2835_dma: add emulation of Raspberry Pi DMA controller

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At present, all DMA transfers complete inline (so a looping descriptor
queue will lock up the device). We also do not model pause/abort,
arbitrarion/priority, or debug features.

Signed-off-by: Grégory ESTRADE <gregory.estrade@gmail.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Andrew Baumann <Andrew.Baumann@microsoft.com>
Message-id: 1457467526-8840-6-git-send-email-Andrew.Baumann@microsoft.com
[AB: implement 2D mode, cleanup/refactoring for upstream submission]
Signed-off-by: Andrew Baumann <Andrew.Baumann@microsoft.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Grégory ESTRADE 2016-03-16 17:06:02 +00:00 • committed by Peter Maydell
parent 355a8ccc5c
commit 6717f587a4
5 changed files with 484 additions and 0 deletions
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47
include/hw/dma/bcm2835_dma.h Normal file
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/*
* Raspberry Pi emulation (c) 2012 Gregory Estrade
* This code is licensed under the GNU GPLv2 and later.
*/
#ifndef BCM2835_DMA_H
#define BCM2835_DMA_H
#include "qemu-common.h"
#include "exec/address-spaces.h"
#include "hw/sysbus.h"
typedef struct {
uint32_t cs;
uint32_t conblk_ad;
uint32_t ti;
uint32_t source_ad;
uint32_t dest_ad;
uint32_t txfr_len;
uint32_t stride;
uint32_t nextconbk;
uint32_t debug;
qemu_irq irq;
} BCM2835DMAChan;
#define TYPE_BCM2835_DMA "bcm2835-dma"
#define BCM2835_DMA(obj) \
OBJECT_CHECK(BCM2835DMAState, (obj), TYPE_BCM2835_DMA)
#define BCM2835_DMA_NCHANS 16
typedef struct {
/*< private >*/
SysBusDevice busdev;
/*< public >*/
MemoryRegion iomem0, iomem15;
MemoryRegion *dma_mr;
AddressSpace dma_as;
BCM2835DMAChan chan[BCM2835_DMA_NCHANS];
uint32_t int_status;
uint32_t enable;
} BCM2835DMAState;
#endif