54 lines
1.6 KiB
C
54 lines
1.6 KiB
C
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/* 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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