diff options
| author | Mark Kettenis <[email protected]> | 2023-01-21 20:27:52 +0100 |
|---|---|---|
| committer | Tom Rini <[email protected]> | 2023-01-27 14:47:57 -0500 |
| commit | dd6b68ed4f5bba78c0cd9765fa48b10cb1542dc7 (patch) | |
| tree | bb7935c4b8651cdeba0e8915ca659894c085bbad /include | |
| parent | 053827b3c39e5a3318002f570679ec46294aa98b (diff) | |
iommu: Add DMA mapping operations
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 <[email protected]>
Diffstat (limited to 'include')
| -rw-r--r-- | include/dm/device.h | 4 | ||||
| -rw-r--r-- | include/iommu.h | 24 |
2 files changed, 28 insertions, 0 deletions
diff --git a/include/dm/device.h b/include/dm/device.h index f3f953c9afc..e9460386ca9 100644 --- a/include/dm/device.h +++ b/include/dm/device.h @@ -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) diff --git a/include/iommu.h b/include/iommu.h index 6c46adf449e..cf9719c5e91 100644 --- a/include/iommu.h +++ b/include/iommu.h @@ -3,6 +3,27 @@ struct udevice; +struct iommu_ops { + /** + * map() - map DMA memory + * + * @dev: device for which to map DMA memory + * @addr: CPU address of the memory + * @size: size of the memory + * @return DMA address for the device + */ + dma_addr_t (*map)(struct udevice *dev, void *addr, size_t size); + + /** + * unmap() - unmap DMA memory + * + * @dev: device for which to unmap DMA memory + * @addr: DMA address of the memory + * @size: size of the memory + */ + void (*unmap)(struct udevice *dev, dma_addr_t addr, size_t size); +}; + #if (CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)) && \ CONFIG_IS_ENABLED(IOMMU) int dev_iommu_enable(struct udevice *dev); @@ -13,4 +34,7 @@ static inline int dev_iommu_enable(struct udevice *dev) } #endif +dma_addr_t dev_iommu_dma_map(struct udevice *dev, void *addr, size_t size); +void dev_iommu_dma_unmap(struct udevice *dev, dma_addr_t addr, size_t size); + #endif |