include/linux/dma-noncoherent.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _LINUX_DMA_NONCOHERENT_H
   3 #define _LINUX_DMA_NONCOHERENT_H 1
   4
   5 #include <linux/dma-mapping.h>
   6
   7 #ifdef CONFIG_ARCH_HAS_DMA_COHERENCE_H
   8 #include <asm/dma-coherence.h>
   9 #elif defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE) || \
  10         defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU) || \
  11         defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL)
  12 static inline bool dev_is_dma_coherent(struct device *dev)
  13 {
  14         return dev->dma_coherent;
  15 }
  16 #else
  17 static inline bool dev_is_dma_coherent(struct device *dev)
  18 {
  19         return true;
  20 }
  21 #endif /* CONFIG_ARCH_HAS_DMA_COHERENCE_H */
  22
  23 void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
  24                 gfp_t gfp, unsigned long attrs);
  25 void arch_dma_free(struct device *dev, size_t size, void *cpu_addr,
  26                 dma_addr_t dma_addr, unsigned long attrs);
  27 long arch_dma_coherent_to_pfn(struct device *dev, void *cpu_addr,
  28                 dma_addr_t dma_addr);
  29
  30 #ifdef CONFIG_ARCH_HAS_DMA_MMAP_PGPROT
  31 pgprot_t arch_dma_mmap_pgprot(struct device *dev, pgprot_t prot,
  32                 unsigned long attrs);
  33 #else
  34 # define arch_dma_mmap_pgprot(dev, prot, attrs) pgprot_noncached(prot)
  35 #endif
  36
  37 #ifdef CONFIG_DMA_NONCOHERENT_CACHE_SYNC
  38 void arch_dma_cache_sync(struct device *dev, void *vaddr, size_t size,
  39                 enum dma_data_direction direction);
  40 #else
  41 static inline void arch_dma_cache_sync(struct device *dev, void *vaddr,
  42                 size_t size, enum dma_data_direction direction)
  43 {
  44 }
  45 #endif /* CONFIG_DMA_NONCOHERENT_CACHE_SYNC */
  46
  47 #ifdef CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE
  48 void arch_sync_dma_for_device(struct device *dev, phys_addr_t paddr,
  49                 size_t size, enum dma_data_direction dir);
  50 #else
  51 static inline void arch_sync_dma_for_device(struct device *dev,
  52                 phys_addr_t paddr, size_t size, enum dma_data_direction dir)
  53 {
  54 }
  55 #endif /* ARCH_HAS_SYNC_DMA_FOR_DEVICE */
  56
  57 #ifdef CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU
  58 void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr,
  59                 size_t size, enum dma_data_direction dir);
  60 #else
  61 static inline void arch_sync_dma_for_cpu(struct device *dev,
  62                 phys_addr_t paddr, size_t size, enum dma_data_direction dir)
  63 {
  64 }
  65 #endif /* ARCH_HAS_SYNC_DMA_FOR_CPU */
  66
  67 #ifdef CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL
  68 void arch_sync_dma_for_cpu_all(struct device *dev);
  69 #else
  70 static inline void arch_sync_dma_for_cpu_all(struct device *dev)
  71 {
  72 }
  73 #endif /* CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL */
  74
  75 void arch_dma_prep_coherent(struct page *page, size_t size);
  76
  77 #endif /* _LINUX_DMA_NONCOHERENT_H */