arch/riscv/include/asm/dma-mapping.h

   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2 /*
   3  * Copyright (c) 2018 Western Digital Corporation or its affiliates.
   4  *
   5  * Authors:
   6  *   Anup Patel <anup.patel@wdc.com>
   7  */
   8
   9 #ifndef __ASM_RISCV_DMA_MAPPING_H
  10 #define __ASM_RISCV_DMA_MAPPING_H
  11
  12 #include <linux/dma-direction.h>
  13
  14 #define dma_mapping_error(x, y) 0
  15
  16 static inline void *dma_alloc_coherent(size_t len, unsigned long *handle)
  17 {
  18         *handle = (unsigned long)memalign(ARCH_DMA_MINALIGN, len);
  19         return (void *)*handle;
  20 }
  21
  22 static inline void dma_free_coherent(void *addr)
  23 {
  24         free(addr);
  25 }
  26
  27 static inline unsigned long dma_map_single(volatile void *vaddr, size_t len,
  28                                            enum dma_data_direction dir)
  29 {
  30         return (unsigned long)vaddr;
  31 }
  32
  33 static inline void dma_unmap_single(volatile void *vaddr, size_t len,
  34                                     unsigned long paddr)
  35 {
  36 }
  37
  38 #endif /* __ASM_RISCV_DMA_MAPPING_H */