mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-24 13:43:28 +00:00
dd6b68ed4f
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>
40 lines
951 B
C
40 lines
951 B
C
#ifndef _IOMMU_H
|
|
#define _IOMMU_H
|
|
|
|
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);
|
|
#else
|
|
static inline int dev_iommu_enable(struct udevice *dev)
|
|
{
|
|
return 0;
|
|
}
|
|
#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
|