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53 lines
1.6 KiB
53 lines
1.6 KiB
/* SPDX-License-Identifier: GPL-2.0-only OR MIT */ |
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/* |
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* Apple SART device driver |
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* Copyright (C) The Asahi Linux Contributors |
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* |
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* Apple SART is a simple address filter for DMA transactions. |
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* Regions of physical memory must be added to the SART's allow |
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* list before any DMA can target these. Unlike a proper |
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* IOMMU no remapping can be done. |
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*/ |
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#ifndef _LINUX_SOC_APPLE_SART_H_ |
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#define _LINUX_SOC_APPLE_SART_H_ |
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#include <linux/device.h> |
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#include <linux/err.h> |
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#include <linux/types.h> |
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struct apple_sart; |
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/* |
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* Get a reference to the SART attached to dev. |
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* |
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* Looks for the phandle reference in apple,sart and returns a pointer |
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* to the corresponding apple_sart struct to be used with |
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* apple_sart_add_allowed_region and apple_sart_remove_allowed_region. |
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*/ |
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struct apple_sart *devm_apple_sart_get(struct device *dev); |
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/* |
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* Adds the region [paddr, paddr+size] to the DMA allow list. |
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* |
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* @sart: SART reference |
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* @paddr: Start address of the region to be used for DMA |
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* @size: Size of the region to be used for DMA. |
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*/ |
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int apple_sart_add_allowed_region(struct apple_sart *sart, phys_addr_t paddr, |
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size_t size); |
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/* |
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* Removes the region [paddr, paddr+size] from the DMA allow list. |
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* |
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* Note that exact same paddr and size used for apple_sart_add_allowed_region |
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* have to be passed. |
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* |
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* @sart: SART reference |
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* @paddr: Start address of the region no longer used for DMA |
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* @size: Size of the region no longer used for DMA. |
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*/ |
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int apple_sart_remove_allowed_region(struct apple_sart *sart, phys_addr_t paddr, |
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size_t size); |
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#endif /* _LINUX_SOC_APPLE_SART_H_ */
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