Author: jmcneill
Date: Sun Jul 10 10:38:28 2016
New Revision: 302522
URL: https://svnweb.freebsd.org/changeset/base/302522
Log:
Align descriptors and data buffers to 32 bits. This restriction is
described in the A20 (and later) user manuals.
Modified:
head/sys/arm/allwinner/a10_mmc.c
head/sys/arm/allwinner/a10_mmc.h
Modified: head/sys/arm/allwinner/a10_mmc.c
==============================================================================
--- head/sys/arm/allwinner/a10_mmc.c Sun Jul 10 10:21:22 2016
(r302521)
+++ head/sys/arm/allwinner/a10_mmc.c Sun Jul 10 10:38:28 2016
(r302522)
@@ -316,7 +316,8 @@ a10_mmc_setup_dma(struct a10_mmc_softc *
/* 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 *
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,
Modified: head/sys/arm/allwinner/a10_mmc.h
==============================================================================
--- head/sys/arm/allwinner/a10_mmc.h Sun Jul 10 10:21:22 2016
(r302521)
+++ head/sys/arm/allwinner/a10_mmc.h Sun Jul 10 10:38:28 2016
(r302522)
@@ -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_ */
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