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 33 #ifdef CONFIG_ARCH_HAS_DMA_MARK_CLEAN 34 void dma_mark_clean(void *addr, size_t size); 35 #else 36 static inline void dma_mark_clean(void *addr, size_t size) 37 { 38 } 39 #endif /* CONFIG_ARCH_HAS_DMA_MARK_CLEAN */ 40 41 void *dma_direct_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle, 42 gfp_t gfp, unsigned long attrs); 43 void dma_direct_free(struct device *dev, size_t size, void *cpu_addr, 44 dma_addr_t dma_addr, unsigned long attrs); 45 int dma_direct_supported(struct device *dev, u64 mask); 46 47 #endif /* _LINUX_DMA_DIRECT_H */ 48