include/linux/dma-direct.h

   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 */