diff options
| author | Mark Kettenis <kettenis@openbsd.org> | 2023-01-21 20:27:52 +0100 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2023-01-27 14:47:57 -0500 |
| commit | dd6b68ed4f5bba78c0cd9765fa48b10cb1542dc7 (patch) | |
| tree | bb7935c4b8651cdeba0e8915ca659894c085bbad /drivers/iommu | |
| 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 <kettenis@openbsd.org>
Diffstat (limited to 'drivers/iommu')
| -rw-r--r-- | drivers/iommu/iommu-uclass.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/drivers/iommu/iommu-uclass.c b/drivers/iommu/iommu-uclass.c index ed917b3c3e..f6b1457736 100644 --- a/drivers/iommu/iommu-uclass.c +++ b/drivers/iommu/iommu-uclass.c @@ -7,6 +7,9 @@ #include <common.h> #include <dm.h> +#include <iommu.h> +#include <phys2bus.h> +#include <asm/io.h> #if (CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)) int dev_iommu_enable(struct udevice *dev) @@ -33,12 +36,37 @@ int dev_iommu_enable(struct udevice *dev) __func__, ret); return ret; } + dev->iommu = dev_iommu; } return 0; } #endif +dma_addr_t dev_iommu_dma_map(struct udevice *dev, void *addr, size_t size) +{ + const struct iommu_ops *ops; + + if (dev->iommu) { + ops = device_get_ops(dev->iommu); + if (ops && ops->map) + return ops->map(dev->iommu, addr, size); + } + + return dev_phys_to_bus(dev, virt_to_phys(addr)); +} + +void dev_iommu_dma_unmap(struct udevice *dev, dma_addr_t addr, size_t size) +{ + const struct iommu_ops *ops; + + if (dev->iommu) { + ops = device_get_ops(dev->iommu); + if (ops && ops->unmap) + ops->unmap(dev->iommu, addr, size); + } +} + UCLASS_DRIVER(iommu) = { .id = UCLASS_IOMMU, .name = "iommu", |