| Christoph Hellwig | ea8c64a | 2018-01-10 16:21:13 +0100 | [diff] [blame^] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | #ifndef _LINUX_DMA_DIRECT_H |
| 3 | #define _LINUX_DMA_DIRECT_H 1 |
| 4 | |
| 5 | #include <linux/dma-mapping.h> |
| 6 | |
| 7 | #ifdef CONFIG_ARCH_HAS_PHYS_TO_DMA |
| 8 | #include <asm/dma-direct.h> |
| 9 | #else |
| 10 | static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr) |
| 11 | { |
| 12 | dma_addr_t dev_addr = (dma_addr_t)paddr; |
| 13 | |
| 14 | return dev_addr - ((dma_addr_t)dev->dma_pfn_offset << PAGE_SHIFT); |
| 15 | } |
| 16 | |
| 17 | static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr) |
| 18 | { |
| 19 | phys_addr_t paddr = (phys_addr_t)dev_addr; |
| 20 | |
| 21 | return paddr + ((phys_addr_t)dev->dma_pfn_offset << PAGE_SHIFT); |
| 22 | } |
| 23 | |
| 24 | static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size) |
| 25 | { |
| 26 | if (!dev->dma_mask) |
| 27 | return false; |
| 28 | |
| 29 | return addr + size - 1 <= *dev->dma_mask; |
| 30 | } |
| 31 | #endif /* !CONFIG_ARCH_HAS_PHYS_TO_DMA */ |
| 32 | #endif /* _LINUX_DMA_DIRECT_H */ |