| /* 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_ */ |