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