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
   5#include <asm/memory.h>
   6
   7/*
   8 * dma_to_pfn/pfn_to_dma/virt_to_dma are architecture private
   9 * functions used internally by the DMA-mapping API to provide DMA
  10 * addresses. They must not be used by drivers.
  11 */
  12static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn)
  13{
  14        if (dev && dev->dma_range_map)
  15                pfn = PFN_DOWN(translate_phys_to_dma(dev, PFN_PHYS(pfn)));
  16        return (dma_addr_t)__pfn_to_bus(pfn);
  17}
  18
  19static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr)
  20{
  21        unsigned long pfn = __bus_to_pfn(addr);
  22
  23        if (dev && dev->dma_range_map)
  24                pfn = PFN_DOWN(translate_dma_to_phys(dev, PFN_PHYS(pfn)));
  25        return pfn;
  26}
  27
  28static inline dma_addr_t virt_to_dma(struct device *dev, void *addr)
  29{
  30        if (dev)
  31                return pfn_to_dma(dev, virt_to_pfn(addr));
  32
  33        return (dma_addr_t)__virt_to_bus((unsigned long)(addr));
  34}
  35
  36static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
  37{
  38        unsigned int offset = paddr & ~PAGE_MASK;
  39        return pfn_to_dma(dev, __phys_to_pfn(paddr)) + offset;
  40}
  41
  42static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
  43{
  44        unsigned int offset = dev_addr & ~PAGE_MASK;
  45        return __pfn_to_phys(dma_to_pfn(dev, dev_addr)) + offset;
  46}
  47
  48#endif /* ASM_ARM_DMA_DIRECT_H */
  49