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Align descriptors and data buffers to 32 bits. This restriction is

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described in the A20 (and later) user manuals.
This commit is contained in:
jmcneill 2016-07-10 10:38:28 +00:00
parent 4e3ae1e52c
commit 6b3911b95d
2 changed files with 7 additions and 2 deletions
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6
sys/arm/allwinner/a10_mmc.c
View File

@ -316,7 +316,8 @@ a10_mmc_setup_dma(struct a10_mmc_softc *sc)
/* Allocate the DMA descriptor memory. */
dma_desc_size = sizeof(struct a10_mmc_dma_desc) * A10_MMC_DMA_SEGS;
error = bus_dma_tag_create(bus_get_dma_tag(sc->a10_dev), 1, 0,
error = bus_dma_tag_create(bus_get_dma_tag(sc->a10_dev),
A10_MMC_DMA_ALIGN, 0,
BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, NULL, NULL,
dma_desc_size, 1, dma_desc_size, 0, NULL, NULL, &sc->a10_dma_tag);
if (error)
@ -334,7 +335,8 @@ a10_mmc_setup_dma(struct a10_mmc_softc *sc)
return (sc->a10_dma_map_err);
/* Create the DMA map for data transfers. */
error = bus_dma_tag_create(bus_get_dma_tag(sc->a10_dev), 1, 0,
error = bus_dma_tag_create(bus_get_dma_tag(sc->a10_dev),
A10_MMC_DMA_ALIGN, 0,
BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, NULL, NULL,
A10_MMC_DMA_MAX_SIZE * A10_MMC_DMA_SEGS, A10_MMC_DMA_SEGS,
A10_MMC_DMA_MAX_SIZE, BUS_DMA_ALLOCNOW, NULL, NULL,

3
sys/arm/allwinner/a10_mmc.h
View File

@ -196,4 +196,7 @@ struct a10_mmc_dma_desc {
uint32_t next;
};
/* DMA descriptors and data buffers must be aligned to 32-bits */
#define A10_MMC_DMA_ALIGN 4
#endif /* _A10_MMC_H_ */