LXR linux/arch/arm/include/asm/dma-direct.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef ASM_ARM_DMA_DIRECT_H
   3#define ASM_ARM_DMA_DIRECT_H 1
   4
   5static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
   6{
   7        unsigned int offset = paddr & ~PAGE_MASK;
   8        return pfn_to_dma(dev, __phys_to_pfn(paddr)) + offset;
   9}
  10
  11static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
  12{
  13        unsigned int offset = dev_addr & ~PAGE_MASK;
  14        return __pfn_to_phys(dma_to_pfn(dev, dev_addr)) + offset;
  15}
  16
  17static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
  18{
  19        u64 limit, mask;
  20
  21        if (!dev->dma_mask)
  22                return 0;
  23
  24        mask = *dev->dma_mask;
  25
  26        limit = (mask + 1) & ~mask;
  27        if (limit && size > limit)
  28                return 0;
  29
  30        if ((addr | (addr + size - 1)) & ~mask)
  31                return 0;
  32
  33        return 1;
  34}
  35
  36#endif /* ASM_ARM_DMA_DIRECT_H */
  37