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iommu: Add DMA mapping operations

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In order to support IOMMUs in non-bypass mode we need device ops
to map and unmap DMA memory.  The map operation enters a mapping
for a region specified by CPU address and size into the translation
table of the IOMMU and returns a DMA address suitable for
programming the device to do DMA.  The unmap operation removes
this mapping from the translation table of the IOMMU.

Signed-off-by: Mark Kettenis <kettenis@openbsd.org>
This commit is contained in:
Mark Kettenis 2023-01-21 20:27:52 +01:00 • committed by Tom Rini
parent 053827b3c3
commit dd6b68ed4f
3 changed files with 56 additions and 0 deletions
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4
include/dm/device.h
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@ -165,6 +165,7 @@ enum {
* automatically when the device is removed / unbound
* @dma_offset: Offset between the physical address space (CPU's) and the
* device's bus address space
* @iommu: IOMMU device associated with this device
*/
struct udevice {
const struct driver *driver;
@ -194,6 +195,9 @@ struct udevice {
#if CONFIG_IS_ENABLED(DM_DMA)
ulong dma_offset;
#endif
#if CONFIG_IS_ENABLED(IOMMU)
struct udevice *iommu;
#endif
};
static inline int dm_udevice_size(void)